| Plenary Sessions | |
| Special Event | |
| LCT | Workshop on LC Science and Technologies |
| AMD | Workshop on Active Matrix Displays |
| FMC | Workshop on FPD Manufacturing, Materials and Components |
| PH | Workshop on Inorganic Emissive Display and Phosphors |
| OLED | Workshop on OLED Displays and Related Technologies |
| 3D | Workshop on 3D/Hyper-Realistic Displays and Systems |
| VHF | Workshop on Applied Vision and Human Factors |
| PRJ | Workshop on Projection and Large-Area Displays and Their Components |
| EP | Workshop on Electronic Papers and Nonvolatile Displays |
| MEET | Workshop on MEMS and Emerging Technologies for Future Displays and Devices |
| DES | Workshop on Display Electronic Systems |
| FLX | Workshop on Flexible Electronics |
| INP | Workshop on Touch Panels and Input Technologies |
| IST | Topical Session on Image Sensing Technologies |
Plenary Sessions
| Dec. 3 | 9:00-9:30 | Opening |
| Dec. 3 | 9:30-11:30 | Keynote Addresses |
Dec. 3 9:00-9:30 Phoenix Hall
Master of Ceremony: Hiroyuki Mori (Executive Chair, IDW ’25)
Opening Remarks
Keiji Ishii (General Chair, IDW ’25)
Ioannis Kymissis (President, SID)
Hideo Saito (President, ITE)
Hiroyuki Mori (Executive Chair, IDW ’25)
Yasufumi Fujiwara (Program Chair, IDW ’25)
Kobayashi-Uchiike-Mikoshiba Prize Award Ceremony
Tomokazu Shiga (Director, IDW General Incorporated Association)
Keynote AddressesDec. 3 9:30-11:30 Phoenix Hall
Chair: Yasufumi Fujiwara (Program Chair, IDW ’25)
| Keynote Address-1
9:30 |
R&D for Future Media and the Role of Displays Kikufumi Kanda NHK (Japan) |
| Keynote Address-2
10:00 |
MicroLEDs: Where are the Successes and What are the Challenges? Ioannis Kymissis Columbia University (United States of America) |
| Keynote Address-3
10:30 |
Digital Human Twins – Our Future Data Selves: Artistic Perspectives on Identity, Embodiment and Agency Ghislaine Boddington University of Greenwich (UK) |
| Keynote Address-4
11:00 |
Beyond Vision, Unleash the Possibilities WeiLung Liau AUO (Taiwan) |
Special Event
| Dec. 3 | 19:00-21:00 | Display Night |
Dec. 3 19:00-21:00 Himawari
Workshop on LC Science and Technologies
| Dec. 3 | 17:10-18:30 | Cosmos 1 | LCT1 | Advanced LCD Technologies |
| Dec. 4 | 14:10-15:30 | Dahlia 1 | LCT2 | LC Materials and Alignment |
| Dec. 4 | 16:00-17:20 | Dahlia 1 | LCT3 | AR/VR and Advanced LC Optical Systems |
| Dec. 5 | 9:00-10:00 | Ran 1 | LCT4 | LC Optics and Beamforming |
| Dec. 5 | 10:50-11:50 | Ran 1 | LCT5 | Emerging LC Applications and Advanced Concepts |
| Dec. 3 | 13:50-15:10 | Conference Management Room | LCTp1 | LC Science and Devices (1) |
| Dec. 4 | 11:10-12:30 | Conference Management Room | LCTp2 | LC Science and Devices (2) |
LCT1: Advanced LCD Technologies
Dec. 3 17:10-18:30 Cosmos 1
Chair: Moritsugu Sakamoto (Nagaoka University of Technology)
Co-Chair: Koichi Miyachi (JSR)
| LCT1-1
17:10 |
Invited Refined Ultra-Low-Power FFS LCD with Enhanced Transmittance and Low Voltage Driving *Akira Sakai1, Hiroaki Asagi1, Daisuke Minami1, Kazuhito Matsumoto1, Yuichi Kawahira1, Kiyoshi Minoura1 1. Sharp (Japan) |
| We have developed an ultra-low power FFS LCD with enhanced transmittance, low-voltage driving, and compatibility with low-refresh-rate driving. Utilizing zero-anchoring technology, excellent display performance, uniformity, and a wide operating temperature range were verified. In addition, improved reliability and favorable flicker performance also demonstrated the potential for integration with low-refresh-rate driving. | |
| LCT1-2
17:30 |
Combined Local Dimming and Image Enhancement Technology for Automotive Displays Under Daylight Condition *Maria Rosa Cirillo1, Ramazan Ayasli1, Julian Ritter1, Sascha Xu2 1. Saarland University (Germany), 2. X-Motive GmbH (Germany) |
| Automotive displays are operated under strongly varying ambient conditions. Local dimming may enhance visual quality in night drive, while image enhancement methods may mitigate daylight reflection. The scope of this paper is to investigate how the combination of local dimming and these image processing methods will impact the visual quality as well as the power consumption for an automotive display under daylight conditions. | |
| LCT1-3
17:50 |
Flicker Minimization in Power-Saving Displays Using Positive Dielectric Anisotropy Liquid Crystals by Optimization of Flexoelectric Coefficients *Junho Jung1,2, Ha Young Jung2, Gyuri Choi2, Dong-Jin Lee1, Hoon Jeong1, Jeong Ki Park1, Minsu Kim2, Seung Hee Lee2 1. LG Display (Korea), 2. Jeonbuk National University (Korea) |
| We present a method to enhance the image quality in low-power LCD using positive dielectric anisotropy LCs (pLCs). The proposed method to measure the flexoelectric coefficient difference (es - eb) enables precise material screening and optimized mixtures. The resulting pLC mixture shows minimized flexoelectric coefficient difference, brightness fluctuation under low-frequency driving. | |
| LCT1-4
18:10 |
Research on the Process Method of Reducing the Reflectivity of TFT-LCD *Tenghui He1, Wenping Yang1, Huihua Liao1, Kang Long1, Feng Liu1, Wenzhang Zhao1, Chen i Huang1, James Hsu1, Wade Chen1 1. Changsha HKC Optoelectronics Technology (China) |
| This paper reduces LCD panel reflectance via process optimization. By adjusting the metal oxide's refractive index in the color filter and adding an organic anti-reflective layer, open-cell reflectance dropped to 1.5%. The solution maintains compatibility with existing TFT-LCD production lines, avoids extra costs, and supports next-gen high-contrast displays. |
LCT2: LC Materials and Alignment
Dec. 4 14:10-15:30 Dahlia 1
Chair: Yukio Hirano (JNC Petrochemical)
Co-Chair: Jeong-Hee Sung (Merck Electronics Ltd.)
| LCT2-1
14:10 |
Invited Latest LC Materials for High Contrast Ratio TV and IT Displays *Peter Zhao2, Sven Christian Laut1, Harald Hirschmann1, Achim Götz1, Lawrence Huang2 1. Merck Electronics KGaA (Germany), 2. Merck Display Materials Co., Ltd (China) |
| Improving image quality is an eternal theme for LCDs due to the high demand from technology and market. Contrast ratio is very essential for image quality when the display is used in ambient light. Therefore, enhancing the contrast ratio especially for IPS/FFS displays is particularly important. In this paper, we will present the evolution of UB-FFS LC mixtures, showcase our latest LC materials that ... | |
| LCT2-2
14:30 |
Invited Fluorinated Tolane-Based Photoluminescence Liquid Crystals with Both Photoluminescence and Room-Temperature Smectic Liquid-Crystalline Properties *Shigeyuki Yamada1, Motohiro Yasui1, Tsutomu Konno1 1. Kyoto Institute of Technology (Japan) |
| In this study, we observed different photoluminescence (PL) behaviors and the formation of enantiotropic smectic A (SmA) phases in the crystalline (Cr) phase for fluorinated tolane derivatives with imidazolium salts at the end of the decyleneoxy flexible chains. Notably, the derivatives with large counteranion formed the SmA phase in the room temperature region, and the PL behaviors were found to significantly change via phase transition ... | |
| LCT2-3
14:50 |
Comparative Quantitative Analysis of Surface Anisotropy Induced by Rubbing and Photo-Alignment on Polyimide Films *Ryo Nakano1, Takayuki Miyamae1 1. Chiba University (Japan) |
| Sum-frequency generation spectroscopy was employed to quantitatively analyze the anisotropy and structure of alignment films. Our findings indicate that rubbing induced anisotropy in entire alignment films, while linear polarized UV light irradiation affected photosensitive cinnamoyl group. This demonstrates that the anisotropy of photosensitive segment is the dominant factor governing liquid crystal molecular alignment. | |
| LCT2-4
15:10 |
Improving Low Temperature Characteristics of New Ferroelectric Liquid Crystal for LCOS and SLM *Tomohiro Ando1, Yuta Kanamori1, Manabu Nakamura1, Michelle Livingston2, Christopher Gabriel2 1. CITIZEN FINEDEVICE CO., LTD. (Japan), 2. Miyota Development Center of America, Inc. (United States of America) |
| In 2024, we succeeded in developing a new FLC mixture for LCOS and SLM that has an improved temperature range for the SmC phase wider and is less occurrence to alignment defects. However, the switching speed were slower than conventional FLCs in SmC phase of lower temperature. This time, we report that we have succeeded in developing an FLC mixture that has improved low-temperature characteristics while ... |
LCT3: AR/VR and Advanced LC Optical Systems
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 4 16:00-17:20 Dahlia 1
Chair: Hiroyuki Yoshida (Kwansei Gakuin University)
Co-Chair: Taiju Takahashi (Kogakuin Univ.)
| LCT3-1
16:00 |
Invited Aberration Improvement in Thin and Lightweight Head-Mounted Displays Using Holographic Optics and Polarized Laser Backlight Jin Hirosawa1, Koichi Okuda1, Hiroaki Kijima1, Yasuhiro Takahashi1, *Shinichi Komura1 1. Japan Display Inc. (Japan) |
| This paper proposes aberration improvement technology for thin and lightweight head-mounted displays with holographic optics and polarized laser backlights. The MTF is improved by adding lens functionality to both the HOE and reflective polarizer. We also discuss realizing high ppd with large low-ppi panels because holographic optics remain thin regardless of the panel size. | |
| LCT3-2
16:20 |
Augmented Reality Waveguide Providing Image Depth Modulation and Magnification-Neutralized Full-Color Real Scenes with Geometric Phase-Based Ultra-Thin Form-Factor Optics *Hyeon Su Jeong1, Erkhembaatar Dashdavaa1, Ju-Won Jang1, Hak-Rin Kim1 1. Kyungpook National University (Korea) |
| We present a compact waveguide-based AR system incorporating switchable geometric phase lens (GPL) to project images at multiple depths. This mitigates the vergence-accommodation conflict and enables seamless integration of virtual and real-world content, enhancing immersion and visual comfort in AR displays. | |
| LCT3-3
16:40 |
Topology-Optimized Spatially Modulated PVGs for Uniform Exit Pupil Expansion in AR Waveguide Displays *Wanchen Zhang1, Yishi Weng1, Liang Zhou1, Chuang Wang1, Ran Wei1, Nan Lin1, Yuning Zhang1 1. Southeast University (China) |
| This paper presents a partition uniformity optimization method based on polarization beam grating (PVG). By adjusting the grating partition width of the coupling area to form blank areas, the uniformity is optimized. The results show that the uniformity of the exit pupil has significantly improved, and the uniformity of the FOV within the eyebox has increased by nearly twice. | |
| LCT3-4L
17:00 |
Development of an Ultra-Thin, Lightweight Pancake Optics with a High-Curvature Single-Resin-Lens *Tokito Yamaguchi1, Takeya Sakai2 1. Seiko Epson Corporation (Japan), 2. Hayashi Telempu Corporation (Japan) |
| We developed an ultra-thin and lightweight pancake optics with a single resin lens. To realize this, a new liquid crystal QWP technique and a RP high-curvature vacuum lamination technique for a reflective polarizer were developed. A prototype lens, 12 mm thick and weighing 10g, demonstrated high image quality. |
LCT4: LC Optics and Beamforming
Dec. 5 9:00-10:00 Ran 1
Chair: Fumito Araoka (RIKEN)
Co-Chair: Hiroyuki Okada (Univ. of Toyama)
| LCT4-1
9:00 |
Invited Programmable Patterning of Reconfigurable Microdroplets on Surfaces Daeseop Choi1, Jun-Hyung Im1, Eunsu Cho1, Jangmin Kim1, Jihye Back1, Seung Woo Lee2, Jin Seog Gwag2, *Youngki Kim1 1. POSTECH (Korea), 2. Yeungnam University (Korea) |
| In this work, we propose the novel method to simply but precisely manipulate the hemispherical LC microdroplet array on a substrate through controlled nucleation and growth. Moreover, UV light irradiation on a photo-sensitive layer enables precise control of LC droplet location and size across the entire surface for pixelazation. The LC droplet arrays display scattered structural color that varies with the specific size of LC ... | |
| LCT4-2
9:20 |
Invited Liquid Crystal-Based Linear Polarization Rotation and Restoration Yi-Xuan Liu1, Pravinraj Selvaraj1, Yun-Jen Tsai1, *Ko-Ting Cheng1 1. National Central University (Taiwan) |
| Precise polarization control based on twisted-nematic liquid crystals (TNLCs) has been proposed. We introduce a linear polarization restorer based on dynamic linear polarization rotator using a 90°-TNLC cell. By varying the applied voltages for different incident polarization directions, the precise restoration of any incident linearly polarized lights to a specified orientation is achieved. | |
| LCT4-3
9:40 |
Electrically Controllable 100 GHz Band Reflectarray with Double Layer Patch Using Nematic Liquid Crystal *Hiroshi Moritake1, Yo Inoue1 1. National Defense Academy (Japan) |
| Double layer patch element, which is added to an additional patch above dielectric layer, using nematic liquid crystal for 100 GHz band electrically tunable reflectarray is proposed. The maximum phase change is achieved to 360 degrees and the frequency range of over 360 degrees is between 90.5 GHz and 120 GHz. Phase change characteristics In this element are independent of the polarization of the incident wave and it is advantage ... |
LCT5: Emerging LC Applications and Advanced Concepts
Dec. 5 10:50-11:50 Ran 1
Chair: Masaru Inoue (TOYOTech)
Co-Chair: Yukihiro Kudoh (Kogakuin Univ.)
| LCT5-1
10:50 |
Invited All-Optical Diffractive Deep Neural Networks Enabled by Liquid Crystal Liu Liu2,1, Quanzhou Long1, Fion Sze Yan Yeung2, Man Chun Tseng2, *Wanlong Zhang1 1. Shenzhen University (China), 2. Hong Kong University of Science and Technology (Hong Kong) |
| In this paper, we introduce a novel approach utilizing a 5-layer all-optical D2NN constructed with photo-induced liquid crystal alignment technology to create LC-based tunable phase retarders, experimentally achieving a classification accuracy of 89% with 500 random hand-written digits from the test MNIST dataset. | |
| LCT5-2
11:10 |
Application of Liquid Crystal Films for Micro-LEDs Inspection Shuo-Hsien Chen1, Yan-Rung Lin2, *Shie-Chang Jeng1 1. National Yang Ming Chiao Tung University (Taiwan), 2. Industrial Technology Research Institute (Taiwan) |
| We demonstrate a method for inspecting micro-LEDs by placing a liquid crystal (LC) film over the micro-LED wafer. When illuminated, micro-LED dies can generate an open circuit voltage through the photovoltaic effect, which can be detected by observing changes in the transmittance of the LC film. | |
| LCT5-3
11:30 |
Flexible and Transparent Liquid Crystal Display with Azobenzene Optical Switch Shunta Nabetani1, Maki Shimada1, Shitaro Aso1, Tsuyoshi Fukaminato2, Seiji Kurihara3, *Yoshimi Ohta1 1. Nissan Motor Corporation (Japan), 2. Kumamoto University (Japan), 3. Chuo University (Japan) |
| An optically switchable transparent liquid crystal display consists of a polymer network liquid crystal (PNLC) containing azobenzene and a light source. The PNLC switches between transparent and screen states through photoisomerization of azobenzene. The flexibility and transparency of the PNLC were achieved by combining monomers of monofunctional reactive mesogens and bifunctional methacrylates. |
LCTp1: LC Science and Devices (1)
Dec. 3 13:50-15:10 Conference Management Room
| LCTp1-1 | A Design Method for Improving Line Image Sticking of High-Refresh-Rate Gaming Display Screens *Ji Wu1 1. ChuZhou HKC Optoelectronics Technology Co., Ltd. (China) |
| The internal electric field of the product panel with high refresh rate is complex, which easily leads to the accumulation of a large number of ions, resulting in line image sticking. In this paper, we use the method of DBS voltage adjustment to effectively improve the occurrence of line residue. | |
| LCTp1-2 | Asymmetric Voltage Compensation Method Study on The Image Sticking in Negative Liquid Crystal FFS LCD Mode *Xiao Fan Wei1, Cheng Ying Shi1, Jiong Liang Fu1, Dan Dan Qin1, Xian Yan Yang1 1. SHANGHAI AVIC Limited Company (China) |
| This paper investigated the significant impact of the adjustment direction of asymmetric voltage on optimizing IS. The conclusion drawn is that positive IS requires adjusting the asymmetric voltage in the negative direction, and negative IS requires adjusting the asymmetric voltage in the positive direction. The image sticking is optimal t when the voltage is best. | |
| LCTp1-3 | Research on Improving Skin Color Distortion Driven by Triple-Gate in LCD Display *Xu Chen1, Tian Mu Yang1, Jian Ma1, Miao Jin He1, Qiang Shun Sun1, Xin Shi Wei1, Ming Yi Chen1, Shuai Shi Huang1, Bing Han1, Paul Shi1, Wade Chen1 1. ChuZhou HKC Optoelectronics Technology Co., Ltd. (China) |
| This paper primarily investigates the generation mechanism of skin color distortion for triple-gate driven products in liquid crystal displays (LCDs). It explores how to improve color non-uniformity in special skin color images from two aspects: manufacturing processes and code modulation, with the aim of enhancing the display quality of LCDs. | |
| LCTp1-4 | Analysis and Research on Chromatic Uniformity of LCD *Wei Ren1, Yan Yang1, Caijiao Zhong1, Guochang Lai1, Xianyan Yang1 1. Xiamen Tianma Microelectronics Co., Ltd. (China) |
| With growing consumer demand for display uniformity, LCD manufacturers face stricter chromaticity uniformity requirements. This study analyzes degradation causes, verifies mechanisms experimentally, and proposes improvement measures to address this key challenge for panel suppliers. | |
| LCTp1-5 | On the Improvement of Color Shift in TFT LCD VA Display *Yuan Guang Liu1, Jie Xiao Wang1, Bing Li1, Le Le Zhang1, Peng Yan Sun1, Yan Hong Chang1, Bing Han1, Shuai Shi Huang1, Paul Shi1, Wade Chen1 1. ChuZhou HKC Optoelectronics Technology Co., Ltd. (China) |
| In this paper, we mainly study the generation mechanism of color shift in TFT VA LCD display, and how to improve color shift from three aspects of design, manufacturing process and code modulation, so as to enhance the display taste of liquid crystal displays. | |
| LCTp1-6 | Research on Novel Panel Design Technologies for Significantly Improving Moving Mura *Le Le Zhang1, Huan Zhang1, Tian Wei Yang1, Yuan Guang Liu1, Bing Li1, Qin Yun Hu1, Shuai Shi Huang1, Bing Han1, Paul Shi1, Wade Chen1 1. ChuZhou HKC Optoelectronics Technology Co., Ltd. (China) |
| In this paper, we present multiple methods to mitigate moving mura in liquid crystal displays (LCDs). Through comprehensive optimizations spanning panel design, manufacturing processes, material selection and code optimizing, we aim to further address the persistent issue of subpar black-state performance in LCD panels. | |
| LCTp1-7 | Analysis of LCD Pressure-Induced Dark Spots Mechanism and Countermeasures *Yuling Yang1, Yahui Xie1, Yanping Yu1, Zhijie Wang1, Caijiao Zhong1, Guochang Lai1, Xianyan Yang1 1. Xiamen Tianma Microelectronics Co., Ltd. (China) |
| The resistance of liquid crystal displays (LCDs) to pressure-induced dark spots directly impacts end-user product experience and has been a key focus in panel manufacturing. In this paper, the mechanism of dark spot formation in small size LCD screens during mechanical stress tests is analyzed and experimentally verified, and some improvement measures are proposed. | |
| LCTp1-8 | Research on the Influence of Backlight Polarization State on LCD Panel Transmittance *li Wei Dong2, Cheng Ying Shi2, Jiong Liang Fu2, Lu Jin2, Dan Dan Qin2, Xian Yan Yang1 1. Tianma Microelectronics Co., Ltd (China), 2. Shanghai AVIC Optoelectronics Co., Ltd (China) |
| This study investigates the transmittance variation of LCD backlight under different prism angles. Experiments with rotating polarizers reveal that the backlight emits partially polarized light, primarily modulated by the prism sheet. Results show that reducing the angle between the prism sheet's alignment and the polarizer's absorption axis significantly enhances transmittance | |
| LCTp1-9L | Electro-Optic Properties of High-Concentration Photochromic Dye-Doped Nematic Liquid Crystal *Ritsuki Domoto1, Hao-chun Yang2, Hsiu-Hui Chen2, Hiroyuki Yoshida1 1. Kwansei Gakuin University (Japan), 2. National Taipei University of Technology (Taiwan) |
| We report the preparation of a high-concentration photochromic dye-doped nematic LC for improved light absorption and electro-optic response. The recently developed diethylcyclopentene derivative dissolves in a commercial nematic LC mixture at a high concentration of 10 wt%, enabling a thin cell to be used for sufficient coloration, thereby improving the response time. | |
| LCTp1-10L | Electro-Optical Properties of Quasi-Twisted Nematic Cell with Spontaneous 90° Twist Liquid Crystal *Rumiko Yamaguchi1 1. Akita University (Japan) |
| A twisted hybrid aligned nematic orientation turns to a TN orientation, that is a quasi TN (Q-TN), by weakening the anchoring on only one side of the substrate. The driving voltage can be reduced in the Q-TN. The relationship between elastic constants, anchoring strengths and electro-optical properties are numerically clarified when using the spontaneous 90° LC cell. | |
| LCTp1-11L | Reverse-Mode Light Dimming Device Using Liquid Crystal Phase Grating for Flexible Smart Windows *Seiya Sugawara1, Takahiro Ishinabe1 1. Tohoku University (Japan) |
| We have developed a reverse-mode light dimming device using a liquid crystal (LC) phase grating instead of a polymer network to achieve a flexible smart window with strong resistance to external forces. By optimizing the pitch and height of the LC phase grating, we realized a light dimming device with high transparency in a voltage-off state and confirmed its effectiveness for flexible smart window applications. | |
| LCTp1-12L | Measurement of Liquid Crystal Efficiency and Cell Gap Thickness via Spectroscopic Interferometry *Jiong Liang Fu1, Chengying Shi, Dandan Qin, Xianyan Yang 1. Shanghai AVIC Optoelectronics Co., Ltd (China) |
| This study combines theory and experiments to calculate liquid crystal phase retardation using polarized light interference. Custom fixtures adjust polarized light while spectrophotometric equipment acquires optical path difference (OPD) spectra for measuring cell gap thickness. This system further enables liquid crystal optical efficiency evaluation. | |
| LCTp1-13L | Liquid Crystal Iris Realized Using Polymer Gravel Microstructures *Che Ju Hsu1, Sonam Sharma2, Rajiv Manohar2, Chi Yen Huang3 1. National United University (Taiwan), 2. University of Lucknow (India), 3. National Changhua University of Education (Taiwan) |
| We present a liquid crystal (LC) iris based on self-assembled polymer microstructures, utilizing a vertically aligned twisted LC cell with a radial gradient in pretilt angles, positioned between crossed polarizers. This configuration enables electrically tunable aperture control with low operating voltage and high aperture tuning ratio, and simplified fabrication. |
LCTp2: LC Science and Devices (2)
Dec. 4 11:10-12:30 Conference Management Room
| LCTp2-1 | Novel Oblique Photoalignment Technique for Multi-Domain Control in VA Cells Filled with Monomer-Doped Nematic LCs *Taiju Takahashi1, Yukihiro Kudoh1, Satomi Suzuki2, Yasuo Toko2 1. Kogakuin University (Japan), 2. Stanley Electric Co., Ltd. (Japan) |
| A nematic LCs doped with an acrylate-based monomer was injected into Vertical Alignment (VA) cells. Oblique UV irradiation for the polymer stabilization to the cell induced a pretilt angle. This method is proposed as a new photoalignment method to pretilt angle control for VA-LCDs. Multi-domain alignment will be realized. | |
| LCTp2-2 | Photostable Composite Thin-Film Polarizer with Multi-Layered Dichroic Structure Using Photoaligned Azo Dyes *Yuechu Cheng1, Man-Chun Tseng1, Yeuk-Lung Ho1, Olena Vashchenko1, Valerii Vashchenko1, Shu-Tuen Tang1, Sze-Yan Yeung1, Hoi-Sing Kwok1 1. The Hong Kong University of Science and Technology (Hong Kong) |
| We present a multi-layer composite thin-film polarizer combining light-stable LCP-M10 and photo-aligned azo dye films to enhance photostability. The design reduces photodegradation while preserving high dichroic performance, demonstrating superior long-term stability in optical tests. This approach offers durable, high-performance solutions for display systems. | |
| LCTp2-3 | Comprehensive Optimization of All-in-One Black Technology in Vehicle Intelligent Cockpits *Peiqin Deng1, Binglin Su1, Ling Wu1, Liting Fang1, Xiaohe Li1, Boping Shen1 1. Xiamen Tianma Microelectronics Co. ltd. (China) |
| The main technical challenge of the one-black technology lies in ensuring the color consistency between the cover glass ink area and the display screen. This paper focuses on optimizing the display's hue through the simulation and design of the array-side film layers, enabling it to closely approximate the hue of the ink. The optimized array film layer design can achieve the Seamless specifications of SCI ... | |
| LCTp2-4 | High Transmittance LCD for Head-Up Displays with Improving Black Domain of Liquid Crystal *Chuhui Feng1, Xiaofen Chen1, Guohao Yang1, Liting Fang1, Ling Wu1, Xiaohe Li1 1. Xiamen Tianma Microelectronics Co., Ltd., (China) |
| We achieved high transmittance with optimizing the pixel design to enhance liquid crystal efficiency. Transmittance increases 10% . | |
| LCTp2-5 | The New Generation of High-Performance ACRUS Display Technology *Xin Meng1, Yu Zhang1, Xiaohe Li1, Zhengyu Yin1 1. Tianma Microelectronics Co., Ltd. (China) |
| We provide a new type of pixel-level dimming implementation scheme, namely ACRUS technology. The scheme has over 100,000 zones and a contrast ratio of 100,000:1. In addition, we have innovatively developed wide-angle seamlessness, low-power consumption, and anti-ghosting technology for the windshield. The power consumption can be reduced to the same level as traditional single displays, and the windshield reflection can be reduced to less than 1%. | |
| LCTp2-6L | Study on Photon-Controlled Optical Switching Devices Using Surface-Stabilized Ferroelectric Liquid Crystals *Kentaro Yamada1, Hiroyuki Okada1 1. University of Toyama (Japan) |
| We investigated photon-controlled optical switching devices using a surface-stabilized ferroelectric liquid crystals. We measured the voltage versus photon-counting characteristics. As a result, we can evaluate voltage dependent photon number characteristics and analyzed statistics arises from Poisson distribution. | |
| LCTp2-7L | Design of Light Guides with Liquid Crystal Switches for Optical Wireless Power Transmission Receiver *Yuki Murayama1, Masakazu Nakatani1, Hideo Fujikake1 1. Tohoku University (Japan) |
| The logistics industry requires drone transportation with sufficient continuous flight range. Optical wireless power transmission is attracting attention as a solution. We are developing light guides with liquid crystal switch to channel light onto a power-generating element. This study examined liquid crystal alignments which are suitable for selectively directing light. | |
| LCTp2-8L | Millimeter-Wave Reflective Liquid Crystal Phase Shifter Employing Two Strip Electrodes of Different Widths *Taichi Murai1, Michinori Honma1, Ryota Ito1, Toshiaki Nose1 1. Akita Prefectural University (Japan) |
| In this study, we propose a liquid crystal (LC) millimeter-wave (MMW) metasurface with orthogonal wire-grid (OWG) electrodes having two different strip widths electrodes as a reflective LC MMW phase shifter that exhibits large phase variations. As a result, experimental verification confirmed that the reflection phase varies by up to 423°. | |
| LCTp2-9L | Random Formation of Twelve Types of Liquid Crystal Micropatterns for Unclonable Optical Security *Sunkuk Kim1, Seong Min Jang1, Young Woo Park1, Jang Kun Song1 1. Sungkyunkwan University (Korea) |
| An optical PUF is realized by spin coating nematic liquid crystal onto glass Micropatterns and thermally inducing phase transition. Channel width control (0-9 µm) yields twelve distinct director patterns under competing anchoring. Polarized microscopy captures unique, reproducible fingerprints. This simple process ensures stability, ideal for compact security tags. |
Workshop on Active Matrix Displays
| Dec. 3 | 13:30-14:50 | Cosmos 1 | AMD1 | Oxide TFT (1) |
| Dec. 3 | 15:20-16:40 | Cosmos 1 | AMD2 | Advanced TFT Technology |
| Dec. 4 | 10:50-12:10 | Cosmos 2 | AMD3/FMC5 | Organic Semiconductors |
| Dec. 4 | 16:00-17:20 | Dahlia 2 | AMD4 | Oxide TFT (2) |
| Dec. 5 | 9:00-10:20 | Cosmos 1 | AMD5 | Oxide TFT (3) |
| Dec. 5 | 10:50-12:10 | Cosmos 1 | AMD6 | Micro/Mini-LED Display |
| Dec. 5 | 14:10-15:30 | Cosmos 1 | AMD7 | Oxide TFT (4) |
| Dec. 3 | 17:30-18:50 | Conference Management Room | AMDp1 | Active-Matrix Device |
AMD1: Oxide TFT (1)
Dec. 3 13:30-14:50 Cosmos 1
Chair: Hiroki Hamada (Kindai Univ.)
Co-Chair: Keisuke Omoto (Apple)
| AMD1-1
13:30 |
Invited Developing High-Performance p-Type Oxide TFTs and CMOS Integrated Circuits *Ao Liu1 1. University of Electronic Science and Technology of China (China) |
| The integration of high-performance p-type oxide TFTs is crucial for next-generation flexible and scalable electronics. However, the limited electrical performance and instability have hindered their application. In my presentation, I will discuss recent progress in developing p-type oxide TFTs and CMOS circuits, with a focus on our latest advances in amorphous tellurium oxide (Te-TeOx). | |
| AMD1-2
13:50 |
Invited Multimodal LTPS and Oxide TFTs *Radu A Sporea1 1. University of Surrey (UK) |
| Thin-film transistors (TFTs) have enabled many applications, with displays being the most pervasive. Yet, shortcomings exist that Ohmic-contact TFTs cannot address, such as off-state leakage in low-temperature polysilicon. Multimodal transistors are new contact-controlled devices with superior off-state operation and versatile behavior that enables compact circuit design. | |
| AMD1-3
14:10 |
Advanced High-Mobility Multilayer TFTs Using Dynamic PVD Gas Separation System *Yujiro Takeda1, Wei-Chun Ma1, You-Ron Lin1, Elliot Lu1, Dejiu Fan2, Jung Bae Kim2, Lynn Yang1, Juergen Grillmayer1, Zero Hung2, Marcus Bender3, Soo Young Choi2 1. Applied Materials Taiwan (Taiwan), 2. Applied Materials, Inc. (United States of America), 3. Applied Materials GmbH & Co. KG (Germany) |
| We investigated high-mobility multilayer TFTs using the dynamic PVD system. The gas separation unit allows comparable TFT performance without a significant increase footprint. The resulting TFTs demonstrate a high field-effect mobility of 26.2 cm²/V·s. In addition, process optimizations enabled the reduction of the channel length to 2 µm, and improved PBTS reliability, with ΔVth 0.8 V. | |
| AMD1-4
14:30 |
One-Step Crystallization of InGaZnO Thin Film by Spray Pyrolysis for High Performance Thin Film Transistor Applications *Arqum Ali1, Jeong-Hwan Lee1 1. Inha University (Korea) |
| We demonstrated as-grown crystalline InGaZnO (c-IGZO) thin film by spray pyrolysis at a substrate temperature of 425 °C without any subsequent crystallization process. The fabricated c-IGZO TFT exhibited high field-effect mobility of 44.93 cm2/Vs and excellent stability under positive bias temperature stress. Therefore, c-IGZO TFTs produced by spray pyrolysis are promising for low-cost, high-resolution display applications. |
AMD2: Advanced TFT Technology
Dec. 3 15:20-16:40 Cosmos 1
Chair: Hideya Kumomi (Japan S&T Agency)
Co-Chair: Hiroshi Tsuji (NHK)
| AMD2-1
15:20 |
Dual-Metal Source Contacts Double the Programming Speed in LTPS Pixel Circuits with Contact-Controlled TFT Switches *Eva Bestelink1, Pongsakorn Sihapitak2, Mark D. Ilasin2, Juan Paolo Bermundo2, Yukiharu Uraoka2, Radu A. Sporea1 1. University of Surrey (UK), 2. Nara Institute of Science and Technology (Japan) |
| Source energy barriers enable contact-controlled transistors to achieve excellent performance as pixel drivers due to early saturation and flat output curves. Their low off-state leakage is attractive for switch applications; however, low on-current may limit transient performance. Introducing a dual-work-function contact significantly improves transient behavior for a range of barrier heights. | |
| AMD2-2L
15:40 |
Invited Tin Halide Perovskites for High-Performance Thin-Film Transistors and Circuits *Huihui Zhu1 1. University of Electronic Science and Technology of China (China) |
| In this talk, I will present our breakthrough in developing high-performance p-channel perovskite TFTs through composition engineering using both solution processing and thermal evaporation approaches. By employing triple-cation compositions in solution processing and lead chloride (PbCl2) modification in thermal evaporation, we demonstrate high-performance TFTs and their successful implementation in complementary logic circuits. | |
| AMD2-3L
16:00 |
Monolithic 3D Integration of Vertically Stacked IGZO-Te CMOS Inverter *Dongbin Lee1, Seongcheol Jang1, Hyun-suk Kim1 1. Dongguk University (Korea) |
| We demonstrate monolithic 3D (M3D) integration of vertically stacked CMOS inverters using n-type IGZO and p-type Te TFTs. Vacuum-based fabrication ensures high-quality films, while the stacked architecture shortens interconnects and increases integration density. Compared with planar CMOS, the inverters show robust operation with a simpler process. | |
| AMD2-4L
16:20 |
High-Performance p-Type Tellurium-Selenium Oxide Thin-Film Transistors Fabricated by Sputtering *Hojeong Jo1, Seongcheol Jang1, Hyun-suk Kim1 1. Dongguk University (Korea) |
| In the study, high-performance p-type TexSeyO thin-film transistors were fabricated by RF magnetron sputtering, enabling superior film quality. Al2O3 layer was employed as high-k gate dielectric for low-power operation and passivation. The devices exhibited enhanced mobility, improved on/off current ratio, and significantly better long-term stability compared with conventional p-type Te transistors. |
AMD3/FMC5: Organic Semiconductors
Dec. 4 10:50-12:10 Cosmos 2
Chair: Yosei Shibata (Nagaoka Univ. of Tech.)
Co-Chair: Genichi Motomura (NHK)
| AMD3/FMC5-1
10:50 |
Invited Organic Thin Film Transistors Having High Mobility Fabricated by High-Speed Solution Process Using Liquid Crystalline Organic Semiconductors *Hiroaki Iino1 1. Institute of Science Tokyo (Japan) |
| Organic transistors are fabricated by high-speed blade coating and dip coting using liquid crystalline organic semiconductors. The polycrystalline thin films fabricated by high-speed blade coating at 140 mm/s, the mobility shows about 5 cm2/Vs and small variation, which is attributed to precursor films of uniform and flat liquid crystalline films, even though high speed solution process. | |
| AMD3/FMC5-2
11:10 |
Invited Science and Applications of Organic Single-Crystal Semiconductors *Jun Takeya1,2,3 1. The University of Tokyo (Japan), 2. Pi-Crystal Inc. (Japan), 3. Organo-circuit Inc. (Japan) |
| Electronic devices in the future sustainable societies require maximum function with minimum amount of constituent materials and energy cost for production. Recently developed two-dimensional organic single-crystal sheets are highly suited for such future electronics in terms of the minimum material consumption and high electronic performance due to electronic coherence. | |
| AMD3/FMC5-3
11:30 |
Invited Prediction of Electronic Properties in Amorphous Organic Semiconductors *Hiroyoshi Naito1,2, Toshio Asada1 1. Osaka Metropolitan University (Japan), 2. Ritsumeikan University (Japan) |
| Amorphous structures of hole-transporting materials were generated via molecular dynamics simulations, and site-specific orbital energies were obtained using quantum chemical calculations. From these data, hole mobility, valence band density of states, trap state distribution near the band edge, and effective density of states were calculated. Agreement with experiments confirms reliable electronic property prediction. | |
| AMD3/FMC5-4
11:50 |
Organic Complementary Inverters Based on Inverted Coplanar Thin-Film Transistors Employing Different Contact Functionalization *Sabrina Steffens1, Hagen Klauk1 1. Max Planck Institute for Solid State Research (Germany) |
| Organic complementary inverters based on inverted coplanar organic TFTs employing two vacuum-deposited small-molecule semiconductors were fabricated on flexible substrates. The source and drain contacts of the TFTs were functionalized with pentafluorobenzenethiol (PFBT) or 4-(methylsulfanyl)-thiophenol (MeSTP). For the optimum combination of materials, the inverters have characteristic signal-delay time constants below 2 µs at a supply voltage of 2 V. |
AMD4: Oxide TFT (2)
Dec. 4 16:00-17:20 Dahlia 2
Chair: Kenichi Takatori (Huawei Techs. Japan)
Co-Chair: Mototaka Ochi (Kobe Steel Ltd.)
| AMD4-1
16:00 |
Invited Recent Advances in LTPO Technology for Mobile OLED Displays *JungChul Kim1,2, SoonSung Ahn1, JunSuk Yoo1, SangYoon Park1, HyunChul Choi1, HyunJae Kim2 1. LG Display (Korea), 2. Yonsei University (Korea) |
| This research introduces a 3D-structured CMOS inverter, alongside its integration into narrow-bezel AMOLED displays, leveraging the advanced capabilities of LTPO TFTs. By vertically aligning an n-type oxide TFT on a p-type LTPS TFT without additional photo masks, the circuit area is reduced by about 50%. Based on the 3D-structured CMOS inverter circuit, the new LTPO GIP reduces the GIP size by approximately 20%. | |
| AMD4-2
16:20 |
Invited Recent Studies on Device Modeling for Oxide Semiconductor TFTs *Katsumi Abe1 1. Silvaco Japan (Japan) |
| This paper discusses device models to predict the electrical characteristics of oxide semiconductor thin-film transistors (OS TFTs) with a dual-gate structure, a bilayer channel, and under positive-bias stresses. Device simulations using the appropriate device models can readily describe the operations and mechanisms of these OS TFTs. | |
| AMD4-3
16:40 |
High Mobility Metal Oxide TFT Backplane Technology for IT AMOLED Display *Fa-Hsyang Chen1, Guowen Yan1, Lin Xu1, Xue Liu2, Lidong Ding1, Zidong Guo2, Wangfeng Xi1, Weiqi Xu3, Rubo Xing1, Xiujian Zhu1 1. Kunshan Govionox Optelectronics Co., Ltd. (China), 2. Yungu (Gu'an) Technology Co., Ltd. (China), 3. Hefei Govionox Technology Co., Ltd. (China) |
| In this study, we demonstrated the high mobility metal oxide TFTs with small Vth variation and good electrical reliability in Gen. 6 and Gen. 4.5 factory. Moreover, the 13.2 and 12.6 inch AMOLED displays have been successfully developed with amorphous MO-1 and polycrystalline MO-2 backplane technology, respectively. | |
| AMD4-4
17:00 |
Oxide TFT-Based OLED Pixel Circuit with Double-Gate Driving Transistor for Wide Data Voltage Range *Eunho Kim1, Dae Cheol Ha1, Kook Chul Moon1, Yong-Sang Kim1 1. Sungkyunkwan University (Korea) |
| This paper proposes an a-IGZO TFT-based OLED pixel circuit using a double-gate driving TFT to extend the data voltage range without capacitive coupling effects. By storing VTH and applying data voltage separately, the circuit enables accurate current control. Under ±0.5 V VTH variation, simulation confirms stable operation with OLED current error rate within ±5% at 5nA. |
AMD5: Oxide TFT (3)
Dec. 5 9:00-10:20 Cosmos 1
Chair: Susumu Horita (JAIST)
Co-Chair: Yujiro Takeda (Applied Materials Taiwan)
| AMD5-1
9:00 |
Invited High-Performance Single-Crystal In2O3 FET Toward 3D VLSI Circuits *Satoru Saito1, Tatsuya Onuki1, Shoki Miyata1, Kazuma Furutani1, Yuji Egi1, Yoshinori Ando1, Motomu Kurata1, Takanori Matsuzaki1, Satoshi Seo1, Shunpei Yamazaki1 1. Semiconductor Energy Laboratory Co. Ltd. (Japan) |
| In2O3 is being considered for application to LSIs due to its high mobility. We have discovered a technique that enables single crystallization on any insulating film by using c-axis-aligned crystalline indium gallium zinc oxide (CAAC-IGZO). We believe that this technique contributes to further advancements in the field of 3D VLSI. | |
| AMD5-2
9:20 |
Invited Atomic Layer Deposited Polycrystalline Ga-doped In2O3 Nanosheet for Field-Effect Transistor Applications *Takanori Takahashi1, Takuya Hoshii2, Yuki Tsuruma3, Misa Sunagawa3, Shigekazu Tomai3, Jongho Park2, Hiroki Tamamoto2, Kuniyuki Kakushima2, Yukiharu Uraoka1 1. Nara Institute of Science and Technology (Japan), 2. Institute of Science Tokyo (Japan), 3. Idemitsu Kosan Co., Ltd. (Japan) |
| We have demonstrated the atomic layer deposition of polycrystalline Ga-doped In2O3 nanosheet channel for field-effect transistor applications. The polycrystalline IGO channel exhibited high intrinsic mobility exceeding 100 cm2/Vs and excellent thickness scalability in nanosheet region below 5 nm. The polycrystalline IGO nanosheets are promising candidates for next-generation semiconductor devices. | |
| AMD5-3
9:40 |
Invited Vertical Channel Oxide TFTs for High-Resolution Displays *Chi-Sun Hwang1, Yong-Hae Kim1, Jae-Eun Pi1, Jong-Heon Yang1, Yong-Duck Kim1 1. ETRI (Korea) |
| Vertical channel oxide TFTs have been introduced for high-resolution display applications, including AR/XR and 3D displays. Despite their potential advantages, vertical TFTs face several technical challenges. A novel device structure may help address these issues. This presentation discusses the fabrication methods and the corresponding electrical performance results. | |
| AMD5-4
10:00 |
Hydrogen-Resistant IGZO TFT with Nitrogen-Engineered SiO2 Gate Insulator via PEALD *Juwon Kim1, Ji Yeon Park1, Seong-A Shin1, Tae Heon Kim1, Chang-Kyun Park1, Jin-Seong Park1 1. Hanyang University (Korea) |
| Hydrogen can diffuse into indium gallium zinc oxide (IGZO) and degrade device stability. Nitrogen doping in SiO2 improves hydrogen resistance by forming Si-N bonds. Plasma-enhanced atomic layer deposition (PEALD) with N2O showed higher nitrogen doping, enabling more effective dielectric engineering for stable oxide thin-film transistors. |
AMD6: Micro/Mini-LED Display
Special Topic of Interest on Micro/Mini LEDs
Dec. 5 10:50-12:10 Cosmos 1
Chair: Masahide Inoue (Huawei Techs. Japan)
Co-Chair: Goshi Biwa (Sony Semiconductor Solutions)
| AMD6-1
10:50 |
Invited Brightness Enhancement in a GaN-Based LED Microdisplay with Aluminum Reflectors and On-Chip Lenses Using Pixel-Level Cu-Cu Connections *Takanobu Akagi1, Haruki Tsuchiya1, Toshihiro Miura1, Ryosuke Matsumoto1, Mikio Takiguchi1, Toru Sasaki1, Michihiro Kanno1, Koichi Nagasawa1 1. Sony Semiconductor Solutions Corporation (Japan) |
| We have developed a 0.26-inch 5644 ppi GaN-based LED microdisplay with increased brightness. For the enhancement of brightness, an aluminum reflector is introduced to each pixel consisting of a small LED mesa and an on-chip lens. The process consists of Cu-Cu hybrid bonding to integrate heterogeneous materials; a die-to-silicon transferred GaN/Si wafer and a CMOS backplane wafer. Consequently, a maximum luminance as high as 560,000 cd/... | |
| AMD6-2
11:10 |
Invited Low-Power Consumption and High-Thermal Stability 0.98-inch Quantum Dot-Based Color Conversion Micro LED Display Pengyu Chen1, *ChihHung Tsai1 1. AUO Corporation (Taiwan) |
| In recent years, the active-matrix inorganic micro LED displays have attracted considerable attention due to their properties of high brightness, high contrast ratio, long operation lifespan. In this study, a comparison was conducted among QDCCs micro LED display, RGB micro LED display, and OLED display technologies with respect to viewing angle characteristics, power efficiency, and brightness degradation at elevated temperatures. | |
| AMD6-3
11:30 |
Invited Advancements and Future Prospects of Micro LED Transparent Display Technology *Chiu Lien Yang1, Chia Hao Tsai1, Yi Cheng Tsai1, Tzu Chieh Lai1, Yung Hsun Wu1 1. Innolux (Taiwan) |
| Micro LED technology is particularly suitable for transparent displays, offering not only high transparency but also enhanced brightness and a wider color gamut. We propose a 22.3-inch three-sided border-less structure as a tiling unit, which can be tiled in an 8x2 configuration for 83.1-inch UHD resolution display. This paper will discuss the major challenges for transparent displays and propose solutions to address them. | |
| AMD6-4
11:50 |
Invited Towards 3D Integration of GaN-on-Si MicroLED and MicroPD Arrays with an Energy-Efficient 22nm FDSOI Transceiver for Short-Range Parallel Optical Communication *Patrick Le Maitre1, Anthony Cibié1, Michael Pelissier1, Sultan El Badaoui1,2, Julia Simon1, Bertrand Gomez1, Frédéric Hameau1, Vincent Puyal1, Amélie Dussaigne1, Laurent Mendizabal1, Luc Maret1, Paolo De Martino1, Pierre Vincent1 1. CEA-LETI (France), 2. University Grenoble Alpes (France) |
| We present a development pathway for short-range optical chip-to-chip communication using GaN-on-Si microLED and microPD arrays integrated with CMOS. The approach combines device and circuit optimization, hybrid bonding, and system modeling, enabling scalable, energy-efficient interconnects for next-generation computing architectures. |
AMD7: Oxide TFT (4)
Special Topic of Interest on Artificial Intelligence and Smart Society
Dec. 5 14:10-15:30 Cosmos 1
Chair: Mutsumi Kimura (Ryukoku Univ.)
Co-Chair: Masaya Tamaki (Kyocera)
| AMD7-1
14:10 |
Invited 5009-PPI OLED/OS/Si Structure Display with Integrated CPUs *Yuki Tamatsukuri1, Minato Ito1, Toshihiko Saito1, Masashi Fujita1, Munehiro Kozuma1, Hidetomo Kobayashi1, Koji Kusunoki1, Yuto Yakubo1, Tsutomu Murakawa1, Yuichi Yanagisawa1, Yutaka Okazaki1, Daiki Nakamura1, Shunpei Yamazaki1 1. Semiconductor Energy Laboratory Co., Ltd. (Japan) |
| A 5009-ppi, 10000-cd/m2 display was achieved using an OLED/OS/Si structure (OS: oxide semiconductor). This structure allows incorporation of functional circuits other than the display driver in the Si layer without widening the bezel. A CPU (Cortex-M0) was incorporated, which demonstrated the feasibility of enhancing the functionality of Si circuits. | |
| AMD7-2
14:30 |
Invited High-Performance IGZO Synaptic Transistors via Floating-Gate Engineering for Neuromorphic Applications *Junhyeong Park1, Yumin Yun1, Sunyeol Bae1, Chae-Hwan Park1, Soo-Yeon Lee1 1. Seoul National University (Korea) |
| In this paper, we present indium-gallium-zinc oxide (IGZO) synaptic transistors based on charge trapping. Floating gate engineering significantly enhanced electron de-trapping without light assistance, while also improving various electrical characteristics. The successful demonstration of a synapse array highlights potential as high-performance synaptic devices for neuromorphic applications. | |
| AMD7-3
14:50 |
IGZO TFT-Based Pixel Circuit for Reducing the Coupling Effect of OLED Parasitic Capacitance *Jeeho Jeong1, Kook Chul Moon1, Yong-Sang Kim1 1. Sungkyunkwan University (Korea) |
| This paper proposes a pixel circuit for IGZO TFT-based OLED displays to address data voltage distortion caused by variations in COLED. The circuit uses a TFT to isolate COLED during data input, enabling stable data voltage storage despite its variation. Simulation results show less than 1% error above 32 gray levels, independent of OLED capacitance variations. | |
| AMD7-4L
15:10 |
Control of Subthreshold Swing under Top-Gate Operation in Dual-Gate IGZO TFTs by Adjusting Capacitance Ratios of Gate Insulators *Forhaz Farid1, Mir Mutakabbir Alom1, Xiaoqian Wang1, Mamoru Furuta1 1. Kochi University of Technology (Japan) |
| In this study, we fabricated dual-gate IGZO TFTs with different capacitance ratios of the gate insulators to control subthreshold swing in the top-gate mode. The bottom-gate capacitance was varied while fixing a constant top-gate capacitance. In the top-gate sweeping mode, even with a constant CTI, the SS can be tuned from 0.14 V/dec. to 0.23 V/dec. by increasing the CBI/... |
AMDp1: Active-Matrix Device
Dec. 3 17:30-18:50 Conference Management Room
| AMDp1-1 | Progressive-Emission Mode 4T2C LTPO Pixel Using Single Gate Driver for Simple High-Resolution AMOLED Displays *Jaein Noh1, Jin Jang1 1. Kyung Hee University (Korea) |
| A novel LTPO 4T2C pixel circuit using two LTPS and two oxide TFTs is proposed. The circuit operates in progressive-emission (PE) mode with a single gate driver, enabling longer emission time and simplified peripheral driving. Simulation confirms robust VTH compensation and extended data range through optimized storage capacitance. The layout design shows the feasibility of 1000-ppi AMOLEDs on glass for AR/... | |
| AMDp1-2 | A Poly-IGO Gate Driver for Micro-LED Display *Seungmin Woo1, Jin Jang1 1. Kyung Hee University (Korea) |
| This paper proposes a gate driver circuit using poly-IGO TFTs for depletion mode. It employs an extra low-level voltage (VGL2) and a series-two transistor structure. The gate voltage of the pull-down TFT drops below VGL2 via capacitive coupling, and discharge is achieved by the previous stage’s carry signal instead of a DC source. These methods fully turn off all TFTs in the off-state, enabling ... | |
| AMDp1-3 | Micro-LED Pixel Circuit with Current Programming for Hybrid Pulse Width Modulation and Pulse Amplitude Modulation Using Double-Gate Structural LTPS TFT *Dae Cheol Ha1, Kook Chul Moon1, Yong-Sang Kim1 1. Sungkyunkwan University (Korea) |
| We propose a micro-LED pixel circuit using double-gate LTPS TFT with current programming. The proposed circuit expresses gray levels using hybrid pulse width modulation and pulse amplitude modulation. Therefore, we achieve stable operation with low current error rate of 6.7% compared to 15% in pixel circuit using single-gate LTPS TFT at low current level of 1.3 µA. | |
| AMDp1-4 | Dynamic Logic Circuits Based on LTPO TFTs for Compact Design and High-Speed Operation *Seungho Lee1, Jin Jang1 1. Kyung Hee University (Korea) |
| We propose LTPO TFT-based dynamic logic circuits with reduced transistor count and improved speed. Compared to static NOR3, the dynamic version achieves 75.6% lower worst-case delay. A gate shift register (GSR) using the proposed inverter also demonstrates proper stage shifting. The results confirm applicability to display-integrated circuits. | |
| AMDp1-5 | Hydrogen-Doped In2O3 Thin-Film Transistors with Enhanced Performance Fabricated by RF Sputtering *Ye-Jin Shim1, Jong-Hyun Jang1, Hyeon Seok Lee1, Min-Seo Kim1, Ju-Yong Kim1 1. Sungkyunkwan University (Korea) |
| Hydrogen-doped In2O3 thin films (In2O3:H) significantly enhanced thin-film transistors (TFTs) performance by passivating oxygen vacancies and improving switching characteristics. These results persuasively demonstrate the exceptional promise of In2O3:H TFTs as advanced semiconductor materials for transparent, flexible, and next-generation display technologies. | |
| AMDp1-6 | An LTPS TFT-Based Pixel Circuit with PWM Driving and Precise Control for Mini-LED Displays *Yu-Chang Chiu1, Yi-Chen Huang1, Ming-Hung Chuang2, Chih-Lung Lin1 1. National Cheng Kung University (Taiwan), 2. AUO Corporation (Taiwan) |
| This work presents a PWM-driven pixel circuit based on LTPS TFTs for mini-LED displays. The circuit compensates for VDD drop and VTH variations, achieving current error rates below 5.05%. Simulation results also demonstrate a turn-on delay under 1 µs and current rising times below 5 µs, confirming precise gray-level control. | |
| AMDp1-7 | A New PWM Pixel Circuit Based on LTPS-TFT for Mini-LED Display without External Sweep Signal *Yu-Hsiang Fu1, Cheng-Rui Lu1, Chih-I Liu1, Ming-Yang Deng2, Chih-Lung Lin1 1. National Cheng Kung University (Taiwan), 2. AUO Corporation (Taiwan) |
| This work introduces a pixel circuit driven by pulse width modulation for mini-LED displays. This circuit doesn’t use a sweep IC but provides the sweep signal through constant current. By compensating for the VTH of the TFT generating the sweep signal, the sweep signals of each pixel are made uniform. | |
| AMDp1-8 | A Sweep Gate Driver Circuit with VTH and Load Variation Compensation for PWM Driving *Ming-Yi Ong1, Cheng-Rui Lu1, Yi-Chen Huang1, Chia-Tien Peng2, Chih-Lung Lin1 1. National Cheng Kung University (Taiwan), 2. AUO Corporation (Taiwan) |
| This work presents a gate driver circuit that generates a sweep signal using a constant current method to detect and compensate for load variation. Compensation for the VTH variation of the charging TFT ensures a consistent sweep signal. All sweep voltage span error rates are below 0.38%. | |
| AMDp1-9 | Impact of the Process Conditions for the Deposition of the Source and Drain Contacts on the Contact Resistance in Organic Thin-Film Transistors *Karla Vanessa Cordero Solano1,2, Ute Zschieschang1, Hagen Klauk1 1. Max Planck Institute for Solid State Research (Germany), 2. Politecnico di Milano (Italy) |
| We found a clear correlation between two process parameters during the gold source/drain deposition in inverted coplanar organic TFTs and the contact resistance. Low deposition rate and high substrate temperature during deposition yield contacts with large Au grains and large surface roughness, which lead to reduced contact resistance. | |
| AMDp1-10 | Channel-Shaped TFT Integration for Electrical Stability Analysis and Hybrid Application in LCD Optimization *Tianjiao Liu1, Feng Liu1, Xingda Xia1, Wei Chen1, Junce Wang1, Qiyu Shen1, huang chen i1, James Hsu1, Wade Chen1 1. Changsha HKC Optoelectronics Technology Co., Ltd. (China) |
| This study systematically compares channel-shaped U-, I-, and III-type TFTs, revealing distinct electrical characteristics under illumination, temperature, and bias stress. The U-type shows superior reliability for pixel circuits, while the III-type excels in switching applications. Hybrid integration in 8-domain pixels enables compact designs with enhanced optical performance. | |
| AMDp1-11 | Analysis and Optimization of Excessive Temperature in LCD Panels *Tian Lan1, Zeyao Li1, Xirong Han1, Tianhao Zhang1, Yuanguo Tan1, Jianyu Cui1, Xianfei Zhu1, Menglin Yang1, Ying Ye1, Maokun Yang1, Xinxin Yang1, Ya Hu1, Zhaoxuan Zhu1, Hua Xiang1, Minghong Shi1, Wade Chen1 1. Chongqing HKC Optoelectronics Technology Co. Ltd. (China) |
| In this article, we investigate the mechanism of temperature rise in LCD panels, and established its thermal simulation model. Through simulation, we have proposed methods to significantly suppress excessive temperature. | |
| AMDp1-12 | New Panel Design and Implementation Method of Narrow Down-Border in LCD Devices *Lihua Zheng1, Yuanyuan Zhong1, Xuexin Lan1, Chunrong Lin1, Jie Lin1, Honghong Nie1, Juanmei Zeng1, Bingping Liu1, Xianyan Yang1 1. XiaMen Tianma Microelectronics Co., Ltd. (China) |
| By optimizing the metal wiring design, combining a new M1 process technology to enhance the M1 CD value after etching, and by controlling the RB022 PI diffusion area, we have developed an LTPS liquid crystal display based on the SALDD process with a lower border of 2.45 mm, and this display supports a wide frequency display of 15~144Hz. | |
| AMDp1-13 | The Research on TFTs Size of 8-Domain Pixel for View Angle Improve *Shuai Shi Huang1, Xun Wei1, Lele Zhang1, Peng Yan Sun1, Qiang Shun Sun1 1. Chuzhou HKC Optoelectronics Technology Co. Ltd. (China) |
| 8-Domain pixels can improve the view angle of VA LCD, and TFTs size are key factor for view angle result. We found that the design value of share TFT size and sub TFT size are not consistent with the actual value. In this patter, the correction factor is been found by experimental and simulation data. Finally, the suitable sizes ratio of share TFT and sub ... | |
| AMDp1-14 | Electrical Drift and Recovery in a-Si TFTs under Thermal Stress: Impact of Electrodes and LC Removal *Feng Liu1, Xingda Xia1, Tianjiao Liu1, Tenghui He1, Wenzhang Zhao1, Junce Wang1, Wei Chen1, Hui Qiu1, Zuojia Xiang1, Qiyu Shen1, Chen i Huang1, James Hsu1, Wade Chen1 1. Changsha HKC Optoelectronics Technology Co., Ltd. (China) |
| In this paper, the electrical drift behavior of a-Si TFTs under thermal and bias stress is investigated. High-temperature aging induces a positive Vth shift, which can be largely recovered by annealing at 200 °C for 15 minutes, offering a potential recovery method. Mo electrodes exhibit better stability than MTD. Alcohol cleaning of liquid crystal avoids thermal stress and enables more reliable electrical evaluation of TFTs. | |
| AMDp1-15 | A Discrete-Time Delta-Sigma ADC Based on MOTFTs *Zhaoyu Deng1, Rongsheng Chen1,2, Man Chun Tseng2, Fion Sze Yan Yeung2 1. South China University of Technology (China), 2. Hong Kong University of Science and Technology (China) |
| In this study, a first-order DT synchronous DSADC fabricated using unipolar MOTFTs is proposed. Experimental results show that the ADC achieves an SNDR of 58.7 dB at a bandwidth of 30 Hz. This ADC consumes a power of 4.5 mW, and its FoM is 106 nJ/c.s. | |
| AMDp1-16 | Study of Ambient Light Sensor Integration in a-Si LCD *Bing Ping Liu1, Jie Lin1, Shao Wei Su1, Xian Yan Yang1, Xue Xin Lan1, Xian Da Chen1 1. Xiamen Tianma Microelectronics Co., Ltd (China) |
| Based on (a-Si ) process , we proposed Ambient light sensor integrated in LCD display. By studying the factors that affect the low brightness recognition accuracy of sensor and the factors that affect device shift after reliability verification. Finally, we have successfully obtained devices with better recognition ability and met the performance requirements after reliability verification. | |
| AMDp1-17 | Design of a-Si TFT for Improvement of Leakage Current *Xiao-Jie Wang1 1. Chuzhou HKC Optoelectronics Technology Co. Ltd. (China) |
| For TFT-LCD, the ratio of on and off current is an important factor of TFT device. High on-off ratio means larger On-State Current and lower off-state current. It directly reflects the quality of light and dark state. In this article, we discuss the TFT design principle that can effectively improve leakage current obtained by measuring the Id-Vg curve of testkey on the product. | |
| AMDp1-18 | Fabrication and Characterization of Top-Gate In-Ga-O Thin-Film Transistors Using Aqueous Precursor Solutions and Excimer Light Irradiation *Hideya Ochiai1, Kazuki Ueda1, Takuya Nomura1, Akira Fujimoto1, Hideo Wada1, Masatoshi Koyama1, Akihiko Fujii1, Akihiro Shimizu2, Noritaka Takezoe2, Hiroyasu Ito2, Toshihiko Maemoto1 1. Osaka Institute of Technology (Japan), 2. Ushio Inc. (Japan) |
| In2O3 and IGO thin-film transistors (TFTs) were fabricated and characterized using a solution process that combines carbon-free aqueous precursor solutions with deep ultraviolet (DUV) excimer light irradiation. The incorporation of Ga into In2O3 facilitated amorphization and enhanced device stability, resulting in a high On/Off current ratio and improved field-effect mobility in IGO TFTs. | |
| AMDp1-19 | Simulation of TFT Reliability Stress Model for Large-Sized TFT-LCD of G8.6 *You-Zheng Lu1 1. ChuZhou HKC Optoelectronics Technology Co., Ltd. (China) |
| In this work, Time-sampling Simulation and lifetime calculation are both used to predict TFT reliability. The thin-film transistor can be used to simulate with the electrical properties of TFT devices according to the parameters measured. Different insulating layer design of TFT device has been investigated by stress model simulation and the TFT device lifetime reliability. | |
| AMDp1-20 | Stability Improvement of IGZO TFTs Using Hydroxyl Radical Generated by UV Treatment of 2-ME Solvent *In-Yeong So1, Gi Yoong Chung1, Kook Chul Moon1, Yong-Sang Kim1 1. Sungkyunkwan University (Korea) |
| In this study, by utilizing hydroxyl radicals as oxidizing agents, stability of devices improved. UV treatment was applied to 2-methoxyethanol (2-ME) solvent for generation of hydroxyl radicals, decomposing 2-ME into smaller organic molecules, thereby reducing the trap sites. As a result, the threshold voltage shift under positive bias stress was reduced from 10.6 to 5.18 V. | |
| AMDp1-21 | A Study on 0.5 µm Channel Length Coplanar c-IGTO:H/a-IGTO TFT for Micro-OLED Display *Jeongha Park1, Solbee Lee1, Taebin Lim1, Jaein Noh1, Jin Jang1 1. Kyung Hee University (Korea) |
| We developed short-channel coplanar thin-film transistors (TFTs) based on c-IGTO:H/a-IGTO homojunctions formed by hydrogen incorporated sputtering and crystallization by O2 annealing. It exhibited excellent performance and stability, with hysteresis-free and negligible VTH shift under positive bias temperature stress (PBTS), even in short-channel. | |
| AMDp1-22 | C-IGTO/a-IGZO Heterojunction Thin-Film Transistors for Micro-LED Display *Solbee Lee1, Taebin Lim1, Jaein Noh1, Jin Jang1 1. Kyung Hee University (Korea) |
| We report the Crystalline indium gallium tin oxide (C-IGTO)/ amorphous indium gallium zinc oxide (a-IGZO) heterojunction thin film transistors (TFTs) with self-aligned coplanar structure. The heterojunction TFT exhibit enhanced electrical performance compared C-IGTO TFTs, as well as excellent stability. | |
| AMDp1-23L | Plasma-Stabilized Ferroelectric HZO for Mechanically Robust TFT Backplanes in Flexible Displays *Jimin Kim1, Hyun Yeol Rho1, Sunkook Kim1 1. Sungkyunkwan University (Korea) |
| We present a plasma-assisted low-temperature crystallization of Hf0.5Zr0.5O2 (HZO) films at 300 oC, enabling ferroelectric phase formation for flexible IGZO TFTs. The HZO/HfO2 stack improves SS (147 to 41 mV/dec), boosts mobility (>5x), and shows stable operation under 10,000 bending cycles, offering a scalable route for high-performance flexible display backplanes. | |
| AMDp1-24L | Threshold Voltage Recovery and Leakage Suppression in IGTO TFTs under Drain Bias and Illumination Stress *Bu Yong Choi1, Byoung Deog Choi1 1. Sungkyunkwan University (Korea) |
| IGTO TFTs were examined under positive drain bias stress (PDBS). In the dark, threshold voltage recovery followed a stretched exponential model, indicating electron detrapping. With illumination, accelerated recovery and negative shifts suggested photo-hole trapping, confirmed by C-V analysis. Arrhenius OFF-current analysis revealed barrier increase, evidencing hot-carrier-induced traps and reliability concerns for displays. | |
| AMDp1-25L | Investigation of Atmosphere- and Temperature-Dependent Trends in IGZO TFTs via Two-Step RTA/Furnace Annealing *Seyepng Yoo1,2, Byoung-Deog Choi1 1. Sungkyunkwan University (Korea), 2. Samsung Institution of Technology (Korea) |
| IGZO TFTs were fabricated using Rapid Thermal Annealing (RTA) and Furnace annealing to study the effect of annealing conditions. Nitrogen-annealed devices showed excellent reliability, while oxygen-annealed devices exhibited low SS. These findings highlight that controlling RTA conditions enables optimization of IGZO devices for targeted functionalities | |
| AMDp1-26L | Bias Stability Evaluation of Amorphous IGZO Thin-Film Transistors using Al2O3 Passivation Layers *Jayeong Jin1, Han Byul So1, Hyung Koun Cho1 1. Sungkyunkwan University (Korea) |
| The fabrication and electrical characterization techniques of a-IGZO thin-film transistors (TFTs) are summarized. A passivation layer was introduced to protect the device from the external environment and to suppress surface adsorption of oxygen and moisture. The results demonstrate that optimized Al2O3 passivation enhances the long-term reliability and electrical stability of a-IGZO TFTs. | |
| AMDp1-27L | Modulation of Electrical Properties in RF-Sputtered Indium-Gallium-Oxide Thin-Film Transistors *Yu Na Che1, Hyung Koun Cho1 1. Sungkyunkwan University (Korea) |
| This study focuses on characterizing the electrical properties of high-mobility thin-film transistors (TFTs) that utilize Ga-doped In2O3 as the active channel layer. The investigation examines the impact of the material's stoichiometric properties and its ability to retain the bixbyite crystal structure on the overall device performance. | |
| AMDp1-28L | Liquid Crystal based Reconfigurable Intelligent Surfaces with Active Matrix Addressing Schemes *Hanghang Li1, Markus Widmaier1, Bilal Mohamed2, Fabian Bette3, Marco Dettling1, Holger Baur1, Norbert Fruehauf1, Wilhelm Keusgen2, Matthias Jost4 1. University of Stuttgart (Germany), 2. Technical University of Berlin (Germany), 3. Rohde & Schwarz GmbH & Co. KG (Germany), 4. Merck Electronics KGaA (Germany) |
| This work sets forth the development and implementation of an active matrix addressed liquid crystal based RIS for 6G wireless communication. A process combining micro-galvanic copper deposition and a-Si:H TFT technology has been integrated. 16 x 16 element active matrix addressed RIS prototypes based on a wideband multi-resonant unit cell topology have been developed, characterized and optimized. |
Workshop on FPD Manufacturing, Materials and Components
| Dec. 3 | 13:30-14:30 | Dahlia 1 | FMC1 | Optical Components (1) |
| Dec. 3 | 15:20-16:20 | Dahlia 1 | FMC2 | Components and Evaluation for Automotive Displays |
| Dec. 3 | 17:10-18:10 | Dahlia 1 | FMC3 | Components for AR Devices |
| Dec. 4 | 9:00-10:00 | Dahlia 2 | FMC4 | Manufacturing and Processes |
| Dec. 4 | 10:50-12:10 | Cosmos 2 | AMD3/FMC5 | Organic Semiconductors |
| Dec. 4 | 16:00-17:00 | Phoenix Hall | FMC6 | Micro-LED Processes |
| Dec. 5 | 9:00-10:00 | Dahlia 1 | FMC7 | Optical Components (2) |
| Dec. 5 | 10:50-12:10 | Dahlia 1 | FMC8 | Metasurface Devices |
| Dec. 5 | 14:10-15:30 | Dahlia 1 | FMC9/VHF6 | Display Measurements and Inspections |
| Dec. 4 | 14:30-15:50 | Conference Management Room | FMCp1 | Manufacturing, Materials and Components |
FMC1: Optical Components (1)
Dec. 3 13:30-14:30 Dahlia 1
Chair: Daisuke Ogomi (Nitto Denko)
Co-Chair: Harumi Okuno (AGC)
| FMC1-1
13:30 |
Room-Temperature Fabrication of Solution-Processed Flexible Bragg Mirrors *Ayumu Nagaoka1, He Sun1, Luyang Song1, Lina Yoshida2, Tsukasa Yoshida1, Yoshiyuki Suzuri1 1. Yamagata University (Japan), 2. National Institute of Technology, Tokyo College (Japan) |
| In this work, room-temperature, solution-processed flexible Bragg mirrors were fabricated by alternately stacking silicon oxide (SiOX) and titanium oxide (TiOX) layers via photo-densification. In the results, we got high refractive index TiOX films (n=2.01) and Bragg mirrors on PET substrates showed 98% reflectance at 400 nm. | |
| FMC1-2
13:50 |
Design of Random Depolarization Films for High Image Quality of Outdoor Displays *Shizuki Sasaki1, Yasuhiro Koike1 1. Keio University (Japan) |
| Random depolarization film (RDF) addresses color degradation issues by randomizing the polarization of light. This study designed RDFs doped with microparticles that induce forward light scattering, which effectively maintained image sharpness at pixel pitch > 100 µm. Furthermore, the surface-treated RDFs achieved practical ambient contrast ratios, improving image quality for outdoor displays. | |
| FMC1-3
14:10 |
A Photothermally Tunable Cylindrical Lens-Incorporated Excitation Arm in Lightsheet Fluorescence Microscopy for Image Contrast Enhancement Ming-Hsuan Ho1, Yu-Hang Cheng1, *Po-Sheng Hu1 1. National Yang Ming Chiao Tung University (Taiwan) |
| A focus-tunable cylindrical lens made of polydimethylsiloxane and incorporated with Cesium tungsten Oxides nanoparticles capable of photothermal conversion was developed for lightsheet fluorescence microscopy. The lens’ focal length is tunable from 46.20 mm to 47.61 mm when the lens’ temperature is raised up to 62 oC via side-illuminated near-infrared irradiation. |
FMC2: Components and Evaluation for Automotive Displays
Special Topic of Interest on Automotive Displays
Dec. 3 15:20-16:20 Dahlia 1
Chair: Kalil Käläntär (Global Optical Solutions)
Co-Chair: Karlheinz h Blankenbach (Pforzheim University)
| FMC2-1
15:20 |
Invited Principles and Measurements of Switchable Privacy Display by Use of LCD and Collimated Backlight *Karlheinz Blankenbach1, Beyza Civanlar1, Awon Alauddin1, Steffen Reichel1 1. Display Lab, Pforzheim University (Germany) |
| Switchable Privacy Displays (SPD) can improve the use of e.g. mobile devices and codriver displays in cars. In 'private' mode, spying in public spaces is prevented and drivers are not distracted. SPDs mainly rely on liquid crystal effects and collimated backlights. We performed numerous measurements to extract relevant parameters, such as luminance vs. viewing angle and uniformity. | |
| FMC2-2
15:40 |
Invited Wavefront Control Using Freeform Optics in Near-Eye and Vehicle XR Displays *Zong Qin1, Mingjing Wang1, Yi Liu1, Qimeng Wang1 1. Sun Yat-Sen University (China) |
| Considering that XR displays require various optical functions, we extend the application of freeform optics. First, a 20-cm-aperture Alvarez lens is reported for varifocal AR head-up displays. Next, a 2D controlled Alvarez lens is proposed to correct arbitrarily combined myopia and astigmatism for near-eye displays. Finally, the freeform optics act as a phase modulator for wavefront coding, extending the depth of field of light-field displays. | |
| FMC2-3
16:00 |
Importance of Edge Strength for HIT Strength in Cover Glass for Automotive Displays *Shunei Fukuyama1, Yusuke Kobayashi1, Kazutaka Hayashi1, Shunji Wachi1, Seikichi Okuma2, Satoru Aida2, Xie Jianbao2 1. AGC Inc. (Japan), 2. AGC Flat Glass Protech (Shenzhen) (China) |
| Headform Impact Test (HIT) is an important reliability test for automotive display cover glass. This work shows cracks often start from the glass edge, based on HIT results of a Tier 1 manufacturer. By simplified HIT tests, we checked high compressive stress by chemical strengthening and well optimized edge processing improved HIT strength. We also propose the 4PB test as an alternative evaluation and discussed why ... |
FMC3: Components for AR Devices
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 3 17:10-18:10 Dahlia 1
Chair: Makoto Kamo (Fujifilm)
Co-Chair: Toshiyuki Endo (Nissan Chem.)
| FMC3-1
17:10 |
Invited Interference Lithography System with Circular Polarization for Polarization Volume Gratings *Yohei Nawaki1, Hiroyuki Kawagoe1, Keisuke Ota1, Kentaro Nomoto1, Kazuyuki Tsuruoka1 1. USHIO Inc, (Japan) |
| We developed a large-area interference lithography system for 200 mm substrates toward high-volume production of liquid crystal polarization volume gratings (PVGs). The system achieves stable fine patterning and precise stage control. Exposure dose dependence was evaluated, confirming effective circularly polarized interference exposure and high-quality PVG fabrication. | |
| FMC3-2
17:30 |
Implementation of Large Field-of-View Waveguide Display via Innovative Broadband Polarization Volume Gratings *Yuchen Gu1, Liang Zhou1, Ran Wei1, LiLi Liu1, Wenjun Xu1, Chuang Wang1, Yishi Weng1, Yuning Zhang1 1. Southeast University (China) |
| A novel gradient-period polarization volume grating (PVG) fabrication method is presented A novel gradient-period polarization volume grating (PVG) fabrication method is presented. A “butterfly-shaped” waveguide uses PVG polarization selectivity to direct left/right FOV beams, stitched by out-coupling gratings to overcome refractive index limits. Experimental results show a 50° diagonal FOV, enabling high-performance AR displays. | |
| FMC3-3
17:50 |
Analysis and Optimization Strategy for Discontinuities in Polarization Volume Grating Exit Pupil Expansion *Qingyu Li1 1. Southeast University (China) |
| This study investigates exit pupil discontinuities in polarization volume grating (PVG) waveguides and proposes geometric optimization strategies. A self-developed RCWA and ray-tracing platform enables simulation of 1D and 2D expansion structures to identify causes and improve pupil continuity in AR displays. |
FMC4: Manufacturing and Processes
Dec. 4 9:00-10:00 Dahlia 2
Chair: Hirohiko Nishiki (Mitsui Kinzoku)
Co-Chair: Makoto Kamo (Fujifilm)
| FMC4-1
9:00 |
Growth Kinetics Control in Atmospheric Pressure Spatial Atomic Layer Deposition for Optimized Al2O3 Barrier Films in OLED Encapsulation *Ji Yeon Park1, Ju Won Kim1, Seong-A Shin1, Chi-Hoon Lee1, Jin-Seong Park1 1. Hanyang University (Korea) |
| In this study, Al2O3growth behavior and film properties under varying dose quantities and substrate speeds in atmospheric pressure spatial atomic layer deposition (AP S-ALD) were investigated. Based on these insights, a multi-step process combining different conditions was developed, achieving both enhanced WVTR (4.4×10-5g/m2·day) and high deposition rate (37Å/min). | |
| FMC4-2
9:20 |
A Waterproof Laser Welding Packaging Technology for LCD *Xiaogang Hu1, Bi Zhu1, Jiahe Cheng1, Xugang Iuo2, Zhicong Kang1, Zhenghong Chen1 1. Chongqing HKC optoelectronics Technology Co.,ltd, China (China), 2. Chuzhou HKC Optoelectronics Technology Co., Ltd (China) |
| This paper presents a novel encapsulation method for LCD panels, which can effectively develop moisture-induced in-plane failure issues during a long-term storage through a non-contact welding method. The new welding method was equipped by 1030nm infrared femtosecond laser, galvanometer scanning system and focusing lens, and owing to these, precise welding can be achieved. | |
| FMC4-3L
9:40 |
A Pneumatic-Electromagnetic Combined Forcing System for the OLED Lamination Process *Taehun Ju1,2, Eun-Ho Lee1 1. Sungkyunkwan University (Korea), 2. Samsung Institute of Technology (Korea) |
| Traditional flat lamination process designs are vulnerable to pressure non-uniformity at the edges, a problem exacerbated by the increasing size of display products. This study proposes a novel multi-physics system that integrates an electromagnetic actuator with an existing pneumatic actuator. Through experiments, we confirmed that this system improves pressure uniformity by up to 53.7%p. |
AMD3/FMC5: Organic Semiconductors
Dec. 4 10:50-12:10 Cosmos 2
Chair: Yosei Shibata (Nagaoka Univ. of Tech.)
Co-Chair: Genichi Motomura (NHK)
| AMD3/FMC5-1
10:50 |
Invited Organic Thin Film Transistors Having High Mobility Fabricated by High-Speed Solution Process Using Liquid Crystalline Organic Semiconductors *Hiroaki Iino1 1. Institute of Science Tokyo (Japan) |
| Organic transistors are fabricated by high-speed blade coating and dip coting using liquid crystalline organic semiconductors. The polycrystalline thin films fabricated by high-speed blade coating at 140 mm/s, the mobility shows about 5 cm2/Vs and small variation, which is attributed to precursor films of uniform and flat liquid crystalline films, even though high speed solution process. | |
| AMD3/FMC5-2
11:10 |
Invited Science and Applications of Organic Single-Crystal Semiconductors *Jun Takeya1,2,3 1. The University of Tokyo (Japan), 2. Pi-Crystal Inc. (Japan), 3. Organo-circuit Inc. (Japan) |
| Electronic devices in the future sustainable societies require maximum function with minimum amount of constituent materials and energy cost for production. Recently developed two-dimensional organic single-crystal sheets are highly suited for such future electronics in terms of the minimum material consumption and high electronic performance due to electronic coherence. | |
| AMD3/FMC5-3
11:30 |
Invited Prediction of Electronic Properties in Amorphous Organic Semiconductors *Hiroyoshi Naito1,2, Toshio Asada1 1. Osaka Metropolitan University (Japan), 2. Ritsumeikan University (Japan) |
| Amorphous structures of hole-transporting materials were generated via molecular dynamics simulations, and site-specific orbital energies were obtained using quantum chemical calculations. From these data, hole mobility, valence band density of states, trap state distribution near the band edge, and effective density of states were calculated. Agreement with experiments confirms reliable electronic property prediction. | |
| AMD3/FMC5-4
11:50 |
Organic Complementary Inverters Based on Inverted Coplanar Thin-Film Transistors Employing Different Contact Functionalization *Sabrina Steffens1, Hagen Klauk1 1. Max Planck Institute for Solid State Research (Germany) |
| Organic complementary inverters based on inverted coplanar organic TFTs employing two vacuum-deposited small-molecule semiconductors were fabricated on flexible substrates. The source and drain contacts of the TFTs were functionalized with pentafluorobenzenethiol (PFBT) or 4-(methylsulfanyl)-thiophenol (MeSTP). For the optimum combination of materials, the inverters have characteristic signal-delay time constants below 2 µs at a supply voltage of 2 V. |
FMC6: Micro-LED Processes
Special Topic of Interest on Micro/Mini LEDs
Dec. 4 16:00-17:00 Phoenix Hall
Chair: Rumiko Yamaguchi (Akita Univ.)
Co-Chair: Tauto Nakanishi (JNC)
| FMC6-1
16:00 |
Invited Step-Free Monolithic RGB µLEDs via GaInN Epitaxial Stacking and Tunnel Junctions *Motoaki Iwaya1, Yoshinobu Suehiro1, Tetsuya Takeuchi1, Satoshi Kamiyama1, Daisuke Iida2, Kazuhiro Ohkawa2 1. Meijo University (Japan), 2. KAUST (Japan) |
| We fabricated step-free GaInN-based stacked RGB monolithic µLED arrays connected via tunnel junctions. Uniform current injection was achieved by forming all electrodes on a single surface using conductive vias. The structure eliminates electrode-level steps, enabling high-density, full-color integration suitable for next-generation AR/VR displays. | |
| FMC6-2
16:20 |
Monolithic Integration of Green, Blue and Red LEDs for Next-Generation Micro-LED Displays with Ultrahigh Definition *Kazutsune Miyanaga1, Genki Tanaka2, Reo Yamato2, Shuhei Ichikawa2, Jun Tatebayashi2, Norio Kanzaki1, Takeo Ogura1, Yasufumi Fujiwara1 1. Ritsumeikan University (Japan), 2. The University of Osaka (Japan) |
| High-density micro light-emitting diode (µ-LED) arrays are one of key components for next-generation ultrahigh-definition displays. As a novel candidate, we report monolithic vertically stacked full-color LEDs consisting of Eu-doped GaN and InGaN/GaN MQWs. Three primary color emission was confirmed on the same wafer with continuous growth of R, B, and G LEDs. | |
| FMC6-3
16:40 |
From Chip to Panel: High-Brightness, Low-Power Mini-LED Backlighting via MicroLED-in-Package (MiP4) *Chia-Hung Tsai1,2, Chih-Jen Tsang3, Ming-Chuan Chih3, Chien-Chi Huang1, Fang-Chung Chen1, Hao-Chung Kuo1, Simon Ogier2 1. National Yang Ming Chiao Tung University (Taiwan), 2. Smartkem Ltd. (UK), 3. Coretronic Corporation (Taiwan) |
| We present MiP4, a Mini-LED structure integrating four sub-85um sized uLEDs in series via RDL on glass. The chip supports native 12V operation, reducing power loss and SMT complexity. Compared to COB, MiP4 reduces GaN usage by 84 percent while achieving 34,047 nits peak brightness in a 400-zone backlight. |
FMC7: Optical Components (2)
Dec. 5 9:00-10:00 Dahlia 1
Chair: Takao Tomono (Keio Univ.)
Co-Chair: Kalil Käläntär (Global Optical Solutions)
| FMC7-1
9:00 |
High-Throughput, Low-cost Aerial Image Display with Prism Arrays *Noboru Ebizuka1, Takuya Hosobata1, Masahiro Takeda1, Yutaka Yamagata1, Yoshiyuki Takizawa1 1. RIKEN (Japan) |
| The novel aerial image display with prism arrays can project a 2D or 3D image, or object into space. This aerial image display is highly efficient because it uses total reflection inside the prisms. The aerial image display does not cause ghosting even when placed nearby an object, therefore it can achieve higher spatial resolution than conventional aerial image displays. | |
| FMC7-2
9:20 |
Expanding the Field of View in a High-Resolution Aerial Display Using a Combination Lens and Retro-Reflector *Kazuaki Takiyama1, Toru Iwane1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| We propose a lens-enhanced aerial imaging by retro-reflection (LeAIRR) optical system using a combination lens that expands the field of view (FOV) and compacts the system’s size. The prototype with a 441 PPI light source display achieves 30-degree FOV and 56 % contrast transfer function (CTF) at the Nyquist frequency. | |
| FMC7-3
9:40 |
Improvement of Numerical Evaluation by Moving Retro-Reflectors in AIRR Using Slitted Retro-Reflectors *Takeru Nishiyama1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| The image gap in aerial images was evaluated using numerical indices. In aerial imaging by retro-reflection (AIRR) with slitted retro-reflector, the image gap can be improved by moving retro-reflector. We calculated image contrast of PSNR, and SSIM while changing moving speed, and clarified the evaluations tend to improve as speed increases. This tendency is similar to subjective perception. |
FMC8: Metasurface Devices
Dec. 5 10:50-12:10 Dahlia 1
Chair: Toshiyuki Endo (Nissan Chem.)
Co-Chair: Daisuke Ogomi (Nitto Denko)
| FMC8-1
10:50 |
Invited Optical Metasurface Devices *Takuo Tanaka1,2 1. RIKEN (Japan), 2. Tokushima University (Japan) |
| Optical metamaterials are artificial sub-wavelength structures that have recently attracted significant research interest due to their potential to enable unprecedented optical phenomena. Optical metasurfaces, the two-dimensional counterparts, manipulate light using ultrathin 2D structures. In this talk, I will discuss their optical properties and also touch on their contribution to display technologies. | |
| FMC8-2
11:10 |
Invited Chip-Scale Surface-Emitting Patterned Light Source Using Photonic-Crystal Phase-Modulating Layers *Yoshitaka Kurosaka1, Kazuyoshi Hirose1, Takahiro Sugiyama1, Masahiro Hitaka1, Akio Ito1, Yutaka Takagi1, Yu Takiguchi1, Yoshiro Nomoto1 1. Hamamatsu Photonics K.K. (Japan) |
| We have developed a chip-scale surface-emitting patterned light source based on a photonic crystal laser and a binary hologram. We have eliminated both mesh-like noise and zero-order noise through appropriate device design. The working mechanism is explained clearly from the viewpoint of the photonic band. We have demonstrated the device via character patterns and gray-scale photographic images. | |
| FMC8-3
11:30 |
Scalable Metalens Fabrication via Nanoimprint Lithography *Takuya Yoshimoto1, Reo Okano1, Yoshiaki Ueno1, Nobusato Iwasaki1, Masato Katsuda1, Kazufumi Nishida1, Yusuke Komoto1, Hiroyuki Takemoto1 1. Nitto Denko Corporation (Japan) |
| A scalable process was developed for fabricating millimeter-scale metalens via nanoimprint lithography (NIL), utilizing phase control through nanostructure height variation. NIL master mold was created via two-photon polymerization 3D printing and nickel electroforming. Imaging tests confirmed that the NIL-fabricated metalens retained performance comparable to the master mold. | |
| FMC8-4L
11:50 |
Direct Retinal Projection by Meta-Optic Mirror *Tomohito Mizuno1, Tetsuya Shibata1, Takeshi Nojiri1, Takekazu Yamane1, Yoji Nakamura1, Shigeaki Tanaka1, Yoichiro Tanaka1, Takehiro Onomatsu1, Kazushi Nishiyama2, Tetsuya Mino2, Kwan-Shun Michael Wong2, Hideaki Fukuzawa1, Seiji Morino3, Makoto Suzuki3 1. TDK Corporation (Japan), 2. SAE Magnetics (Hong Kong) Limited (Hong Kong), 3. QD Laser, Inc. (Japan) |
| Direct retinal projection (DRP) is a strong candidate to realize ultra compact, stylish and ultra-low power consumption smart glasses. An ultra-thin meta-optic mirror with a thickness of 105 nm trapezoidal structures was fabricated to replace a bulky free-surface reflective mirror which is an obstacle and loses stylishness in front of user’s eye. Characters image projection was successfully demonstrated by meta-optic mirror in DRP. |
FMC9/VHF6: Display Measurements and Inspections
Dec. 5 14:10-15:30 Dahlia 1
Chair: Johan Bergquist (Consultant)
Co-Chair: Yuzo Hisatake (Shizuoka University)
| FMC9/VHF6-1
14:10 |
Novel Method for Evaluating Temporal Accuracy on Refresh Rate of Display *Hyunah Suh1, Dongyeol Yeom1, Hyosun Kim1, Yongwoo Yi1, Jaejoong Kwon1 1. Samsung Display (Korea) |
| There are various measurement methods to evaluate FOS (Front-of-Screen) of static images, but few to evaluate the quality of moving images. We developed a new concept called “Temporal accuracy” and also developed the method to calculate temporal accuracy. We found that a high refresh rate does not necessarily lead to excellent temporal accuracy. | |
| FMC9/VHF6-2
14:30 |
Metrology Errors in On- and Off-Axis Curved Displays Caused by Measurement Field Distorted Geometry K Käläntär1,2, Heyder Khalilov2, *Elgün Tağiyev2 1. Global Optical Solutions (Japan), 2. Nakhchivan State University (Azerbaijan) |
| This paper analyzes measurement errors in cylindrical, spherical, and conical surfaces, focusing on both on- and off-axis inaccuracies. It examines how curvature and alignment affect data reliability and proposes strategies to minimize error propagation, improving measurement accuracy in complex geometries. | |
| FMC9/VHF6-3
14:50 |
Design of a 4-Channel Scanning Acoustic Microscopy System with Synthetic Aperture Focusing for High-Resolution Defect Detection in OLED Displays *Hwijin Kim1, Sohyun Won1, Seoyoung Jang1, Heechul Yoon1 1. Dankook University (Korea) |
| This study presents the design of a 4-channel scanning acoustic microscopy (SAM) system incorporating a synthetic aperture focusing (SAF) technique. This method effectively enhances the signal-to-noise ratio (SNR) and reduces sidelobes, enabling clearer visualization of multilayered defects in display manufacturing wafers. | |
| FMC9/VHF6-4L
15:10 |
Evaluation of Display Films Using a Three-Dimensional Optical Wave Field Microscope (3D-OWFM) *Kensaku Shimoda1, Shimon Matsumoto1 1. Otsuka Electronics Co., Ltd. (Japan) |
| In this study, we evaluated display optical films using Three-dimensional Optical Wave Field Microscope (3D-OWFM), which records three-dimensional distributions of complex transmittance. Using 3D-OWFM, we assessed surface profiles and internal refractive-index distributions of the specimens. These results indicate that 3D-OWFM can serve as a complement to existing measurement techniques. |
FMCp1: Manufacturing, Materials and Components
Dec. 4 14:30-15:50 Conference Management Room
| FMCp1-1 | Study on the Mechanism of Color Mura Suppression Based on G-SiNx Structure, Process Parameter Optimization, and PVX1 Layer Design *Wenping Yang1 1. Changsha Huike Optoelectronics Co., LTD (China) |
| This study investigates Color Mura in 8K HDR/WCG TFT-LCDs using G8.5 panels. Experiments examined how multi-layer GI configurations (single/double/triple), NF3/Cl2 etching ratios, and PVX1 passivation thickness affect Color Mura. Results show reducing interference interfaces, optimizing NF3/Cl2 ratios, and increasing PVX1 thickness effectively suppress Color Mura (delta_uv < 0.005). | |
| FMCp1-2 | Scratch Resistance Enhancement for Array Backplanes via Passivation Layer and Metal Wire Optimization *Jie Zhang1, Yi Chuan Zhang1, Zhong Ming Song1, Xing Xing Tang1, Zhen Liu1, He Jing Zhang1, James Hsu1, Wade Chen1 1. Chongqing HKC Optoelectronics Technology Co., Ltd. (China) |
| This study investigates scratch resistance enhancement for array backplanes through passivation layer and metal wire optimization. Systematic experiments demonstrate that increasing SiNx thickness and optimizing CVD parameters improve mechanical robustness without compromising electrical performance. In addition, the scratch resistance is significantly enhanced by thickening the top-MoN layer in M2 stacks. | |
| FMCp1-3 | Advances in Sub-Micron Lithography for High-Resolution VR Display Manufacturing *Yuta Mizutani1, Yusuke Isokawa, Takanobu Akiyama 1. Nikon Corporation (Japan) |
| Nikon’s FX-6AS Gen.6 exposure system demonstrates potential for next-gen VR production, achieving 0.85µm L/S and 1.0µm Hole resolution through optimized RET, PSM, and CA resists. These results approach the 0.8µm L/S target, supporting future ultra-high-resolution display manufacturing. | |
| FMCp1-4 | Optimization of Transparent Material Mark Recognition for Liquid Crystal Display *WenZhang Zhao1, Ming Wu1, SuDi Rao1, YunBo Li1, WenPing Yang1, TengHui He1, Feng Liu1, ChenI Huang1, James Hsu1, Wade Chen1 1. Changsha HKC Optoelectronics Technology Co., Ltd. (China) |
| For LCDs with transparent color filters (CF), e.g., CF 4Mask & BOA (BM on array), achieving precise TFT-CF alignment is challenging due to low-contrast marks on the CF side. This study optimizes alignment marks from multiple angles, conducting capture tests on VAB alignment equipment. Based on test results, it summarizes the equipment's mark recognition patterns and explores alternative optimization approaches. | |
| FMCp1-5 | Cause Analysis of Bubble Formation in TFT-LCD Products after High-Reliability Ball Drop Test *Xianfei Zhu1, Zeyao Li1, Xiaowu Sun1, Xirong Han1, Tianhao Zhang1, Jianyu Cui1, Tian Lan1, Yuanguo Tan1, Ying Ye1, Menglin Yang1, Maokun Yang1, Zhaoxuan Zhu1, Ya Hu1, Hua Xiang1, Minghong Shi1, Wade Chen1 1. Chongqing HKC Optoelectronics Technology Co. Ltd. (China) |
| This paper addresses the issue of in-plane bubble formation in TFT-LCD display products after high-reliability ball drop testing. By observing the bubble area using FIB laser, it was found that CF-ITO fractures exist at the overlap positions of color resist, providing a solution direction for improving bubble problems in the later stage. | |
| FMCp1-6 | Research on Bubble at High-Temperature Storage Ball Drop of TFT-LCD *Jinsong Lu1, Ranlong Wang1, Qin Xiong1, Dengli Yao1, Jianfeng Yang1, Kaijun Liu1, Jinn Hung1, James Hsu1, Wade Chen1 1. Chongqing HKC Optoelectronics Technology Co., Ltd. (China) |
| When TFT-LCD TV products are tested for HTS=>Ball Drop reliability, they are prone to display abnormality caused by Bubble defects. In this paper, we have studied the causes of Bubble and planned verification experiments, which have greatly improved the occurrence of Bubble defects. | |
| FMCp1-7 | Etch-Free Direct Patterning of Sol-Gel CuxO/IGZO Heterojunctions for Ternary Logic Circuits *Seokhyeon Baek1, Sungjun Park1 1. Ajou University (Korea) |
| A ternary inverter was fabricated using a SAM-patterned sol-gel CuxO/IGZO heterojunction without photolithography. The device exhibited stable electrical performance and clear three-level logic. SAM patterning enabled the formation of a well-defined and spatially selective heterojunction structure. This etch-free, solution-processable approach offers a scalable strategy for next-generation printed multi-valued logic circuits. | |
| FMCp1-8 | Influence of Inlet Configuration on Precursor and Thermal Uniformity in MOCVD Reactors *Chehung Wei1, Long-Sheng Li1 1. Tatung University (Taiwan) |
| CFD analysis of three GaN MOCVD inlet designs showed central inlets gave uniform flow and temperature, while an off-center inlet caused asymmetry. Large, centrally aligned inlets improve precursor delivery and thermal uniformity by minimizing Peclet numbers, avoiding lateral jets, and sustaining laminar flow. | |
| FMCp1-9 | Scalar Diffraction Study in Proximity Printing *Minchul Sakong1, Jaewon Huh1, Musun Kwak1, Yuho Jung1, Sungjin Oh1, Youngseok Choi1 1. LG Display Co., Ltd. (Korea) |
| The Column Spacer in Color Filter Process proceeds as Proximity Printing, but there are few reports on the impact of the conditions. Based on the commonly known Diffraction theory, this study defined the Diffraction Limit Value K through phenomenon measurement, theoretical interpretation, simulation analysis, and experimental verification, and interpreted/presented the optimized design. | |
| FMCp1-10 | Study on PID Control Parameter Optimization for Reducing Electric Energy Consumption in Oven Bake Equipment *Jaewon Huh1, Musun Kwak1, Taehyoung Kim1, Minchul Sakong1, Minwoo Park1, Yoonsun Kang1, Hakrin Kim2, Youngseok Choi1 1. LG Display (Korea), 2. Kyungpook National University (Korea) |
| We evaluated the PID Setting values for controlling the temperature characteristic profile of heat treatment equipment to optimize them in terms of temperature and power consumption, and derived conditions for reducing power consumption while maintaining the same level as the existing temperature characteristics, and confirmed reproducibility. | |
| FMCp1-11 | Tunable Mechanical and Optical Properties of Al-Doped SiC-ON Thin Films Using Reactive Co-Sputtering at Room Temperature *HyeonSeok Lee1, Jong-Hyun Jang1, Ju-Yong Kim1, Ye-Jin Shim1, Min-Seo Kim1, Han-Ki Kim1 1. Sungkyunkwan University (Korea) |
| Al-doped silicon carbide-oxynitride (Al:SiC-OxN) thin films were deposited at room temperature on Corning Gorilla Glass 7 via reactive co-sputtering. Process optimization achieved high hardness and refractive index with low extinction coefficients. These results demonstrate the viability of low-temperature fabrication for optical coatings with tunable mechanical robustness and transparency. | |
| FMCp1-12 | Per- and Polyfluoroalkyl Substance-Free Liquid-Repellent Black Bank for Inkjet-Printed Displays *Junghwi Lee1, Masato Miyashita1, Shinya Oku1 1. Tosoh Corporation (Japan) |
| A per- and polyfluoroalkyl substance-free liquid-repellent black bank containing photoinitiated crosslinking and alkali-soluble units was developed for flexible displays and wearable devices. It had high UV curability, liquid repellency, and optical density; prevented RGB light mixing; and enabled fine, defect-free patterning. Inkjet tests showed precise quantum dot-ink retention in pixel areas. | |
| FMCp1-13 | PVG-Based Program for High-Speed Simulation System Optimization *Liang Zhou1, Yishi Weng1, Yuning Zhang1, Ran Wei1, Canran Yang1, Yuchen Gu1, Chuang Wang1, Nan Lin1, Wanchen Zhang1, Baoping Wang1 1. Southeast University (China) |
| This paper presents a simulation acceleration and optimization program. Using this program, we conducted simulations for Polarization Volume Gratings (PVG) and Chirped Polarization Volume Grating (CPVG) waveguide systems, and performed time consumption analysis compared with commercial software under identical configurations. We implemented uniformity optimization design for PVG waveguide structure, the exit pupil uniformity was effectively improved. | |
| FMCp1-14 | Enhancement of Light Extraction in Micro-LEDs Using Curvature-Tuned Polymer Micro-Lens Arrays via Nanoimprinting and Thermal Reflow *Yerin Choi1,2, Seung Je Lee1, Gang Yeol Yoo1, Soo Jin Kim2, Hyun Min Cho1 1. Korea Electronics Technology Institute (KETI) (Korea), 2. Korea University (Korea) |
| This study presents the fabrication of micro-lens arrays (MLAs) using a simple and low-cost Nanoimprinting method. Compared to conventional techniques, this method facilitates wafer-scale fabrication, yielding micro-lens arrays with superior surface quality and low surface roughness. Furthermore, by applying a micro-lens structure to the micro-LEDs, the luminance was improved by 20.17%. | |
| FMCp1-15 | Effect of Draft Angle Deviation on Aerial Imaging Performance of Dihedral Corner Reflector Arrays *Cheng-Yu Chang1, Chien-Yu Chen1, Tzu-An Chou1 1. National Taiwan University of Science and Technology (Taiwan) |
| This paper analyzes optical simulations of an aerial display using a dihedral corner reflector array (DCRA) with draft angles. Introducing a 1-2 deg draft angle (from 90 deg to 88 deg) slightly improves optical flux (approx 14% to 16%) without significantly reducing image quality (SNR approx 80 dB). | |
| FMCp1-16 | Spectrally Accurate Aerial Image Formation by Use of Three-Dimensional Objects as Light Sources *Ryosuke Ichikawa1, Takehide Ikeda1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| An aerial imaging system using 3D objects as light sources is proposed to reproduce true-to-nature spectra for animal vision research. Conventional displays cannot show certain wavelengths accurately. This method forms aerial images whose spectrum matches the light source, covering ranges like 500 nm and 580 nm. It enables precise visual stimuli, useful for VR biology and zoology. | |
| FMCp1-17 | Proposal of a Non-Contact Size Measurement Method by Aligning the Aerial Images of Animals with Transparent Scale *Aoba Makishima1, Ryosuke Ichikawa1, Takehide Ikeda1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| We propose a contactless method for animals using AIRR (aerial imaging by retro-reflection). By aligning the aerial image of animals with a transparent scale, animal size can be measured with less than 1.5% deviation from actual size. Our proposed method enables measurement of animal size without contact. | |
| FMCp1-18 | Achieving Asymmetric Optical Properties Using Nanoparticle-Dispersed Scattering Layers for Directional Transparent Displays *Jaram Lim1 1. Soonchunhyang University (Korea) |
| The goal of this study is one-way visibility control of transparent displays. Scattering solution was prepared by a process using a polymer- alumina nanoparticle. The weight percent, and coating condition were optimized to confirm whether one-way visibility control was possible. Based on these results, we intend to investigate whether one-way viewing control of transparent displays is possible. | |
| FMCp1-19 | Extension of Floating Distance and Magnification of Aerial Images in the AIRR Optical System by Use of a Convex Mirror *Akito Fukuda1, Sotaro Kaneko1, Kazuaki Takiyama1, Toru Iwane1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| We propose an aerial Imaging by Retro-reflection (AIRR) optical system with a convex mirror to extend the floating distance and increase the size of aerial images. The floating distance and the size of the aerial images can be expanded approximately 2.4 and 3.6 times by changing the position of the optical virtual image by the AIRR optical system behind the convex mirror. | |
| FMCp1-20L | Development of a New Technology That Can Quantitatively and Accurately Measure the Surface Quality of Displays *Do-Young Jeong1, Gang-Ho Go1, Kwan-Young Han1 1. Dankook University (Korea) |
| In this study, we focus on the degradation of surface quality in foldable OLED displays caused by the folding and unfolding process at the bending region. To address this issue, we developed a novel method for the rapid and quantitative evaluation of surface quality, and we present both the principle of this method and the development results of the evaluation system designed to implement it. | |
| FMCp1-21L | Demonstration of Two-Dimensional Optical Beam Manipulation Using Dual-Layer Optical Phased Array Comprising Electro-Optic Polymer and Silicon Nitride Waveguides *Masato Miura1, Yuji Miyamoto1, Junichi Shibasaki1, Masakazu Nanba1, Kenji Machida1, Rieko Ueda2, Takahiro Kaji2, Toshiki Yamada2, Akira Otomo2, Yoshikuni Hirano1 1. Japan Broadcasting Corporation (NHK) (Japan), 2. National Institute of Information and Communications Technology (Japan) |
| This study presents a dual-layer optical phased array (OPA) that incorporates electro-optic (EO) polymer phase shifters and an aperiodic silicon nitride emitter array, aimed at applications in augmented reality devices that reconstruct natural 3D images. To the best of our knowledge, this is the first demonstration of 2D beam manipulation using an OPA with phase shifters through the EO effect at a wavelength of 1.55 µ... | |
| FMCp1-22L | Anisotropic Light Diffusion Patterns in 180o Twisted Nematic Reverse-Mode PDLC *Yoki Yamazaki1, Rumiko Yamaguchi1 1. Akita University (Japan) |
| We have investigated light diffusion patterns in 180° twisted nematic (TN) reverse-mode polymer-dispersed liquid crystal (R-PDLC) cells to elucidate the scattering mechanism. At low voltage, the twisted structure causes the polarization rotation of incident light, leading to the scattering of extraordinary light throughout the bulk. At high voltage, both ordinary and extraordinary light are scattered in an anisotropic pattern. | |
| FMCp1-23L | Design of an Aerial Display to Induce Predatory Behavior in Praying Mantises *Takehide Ikeda1, Ryosuke Ichikawa1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| We report a pilot study using an aerial display based on Aerial Imaging by Retro-Reflection (AIRR) to deliver barrier-free, life-sized visual stimuli to terrestrial animals. Ghost mantises showed predatory behavior toward aerial images of crickets, indicating that the system can induce natural behavior from visual cues alone. This demonstrates AIRR’s potential as a tool for VR biology. | |
| FMCp1-24L | Analysis and Comments on AI-Driven Stray-Light and Ghost Mitigation in Display Optics *Chung-Jen Ou1, Yi-Jhen Yang1, Bo-Nian Tsai1 1. JMO Corp. (Zhong Yang Technology Co., Ltd.) (Taiwan) |
| This study presents an AI-driven framework for diagnosing and mitigating stray light and ghost artifacts in display optics. Combining image-based diagnostics with reflective-path inference, it identifies causal surfaces, qualitatively estimates luminance, and derives design guidelines. The method enhances uniformity and clarity while complementing physics-based simulations. | |
| FMCp1-25L | Optical Efficiency Simulation Correlated with Temperature Increase in an Aerial Heater Composed of Surface-Reflective Optical Components *Sotaro Kaneko1, Kazuaki Takiyama1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| We confirm that higher simulated optical efficiency leads to higher temperature increase with a correlation coefficient of 0.98 in an aerial heater by use of surface-reflective optical components. This result clarifies that optical efficiency simulation can provide design guidelines for aerial heater and adequate parameters for higher temperature increase. | |
| FMCp1-26L | Indium Tin Oxide Etch Characteristics Using CxH2x+2(x=1,2,3)/Ar *Min Cheol Kim1, Jong Woo Hong1, Geun Yong Yeom1 1. Sungkyunkwan University (SKKU) (Korea) |
| Using CH4, C2H6 and C3H8 mixed with Ar, we optimized ITO etching for next-generation displays. Increasing the carbon-to-hydrogen ratio enhanced etch rate, PR selectivity, and anisotropy profile while smoothing surfaces. | |
| FMCp1-27L | A Comparative Investigation of Continuous-Wave and Pulsed Plasma for Anisotropic Etching of TiO2 for Metalenses *Akihide Sato1, Jongwoo Hong1, Geunyoung Yeom1 1. Sungkyunkwan University (Korea) |
| TiO2 meta materials composed of high-aspect-ratio pillars with varying widths can enable planar metalens thinner than a sheet of paper without chromatic aberration. In this study, ACL-masked TiO2 pillars were etched using ICP with C4F8/SF6/Ar under CW, bias, synchronous, and asynchronous pulsing. CW maximized etch rates, while pulsed modes enhanced selectivity and ... | |
| FMCp1-28L | Etching Characteristics of IGZO in Inductively Coupled Plasmas with Low-GWP Hydrofluorocarbon Gases *Dae Yeon Ha1, Jong Woo Hong 1, Geun Young Yeom1 1. Sungkyunkwan University (Korea) |
| Indium gallium zinc oxide (IGZO) was etched in an inductively coupled plasma using hydrofluorocarbon (HFC) gases. The H/F ratio in HFC strongly influenced etch rate and selectivity; higher H/F enhanced Zn removal and volatile In(CHx)y formation. Among tested gases, C3H6F2 (HFC-272ca, GWP100yr = 139) gave the highest etch rate (~55 nm/min), minimal dimensional ... | |
| FMCp1-29L | Development of In2O3-Based Transparent Conductive Materials for UV-Emitting Devices *Masaki Yasuda1, Jumpei Kamikawa1, Murata Kotaro1, Nobuhisa Fujima1, Hiroko Kominami1, Kazuhiko Hara1, Akihiro Yamaji2, Shunsuke Kurosawa2 1. Shizuoka University (Japan), 2. Tohoku University (Japan) |
| We are developing new ultraviolet light-emitting devices. We aimed to shift the absorption edge to the shorter wavelength side by replacing existing transparent conductive films with wide-gap oxide constituent elements. We are developing more suitable materials by feeding back the results of bandgap calculations using first-principles calculations into sample fabrication. | |
| FMCp1-30L | ZrO2-Based Memristors Integrated with ZnO/SnO2 Nanoparticle Photo-Assisted Composite for Neuromorphic Computing Applications *Jun-Fu Yang1, Ci-Ming Liou1, Yu-Wu Wang1 1. National Changhua University of Education (Taiwan) |
| This study investigates UV-photosensitive memory devices with Ag/ZrO2/Ag, Ag/ZrO2/SnO2/Ag, and Ag/ZrO2/ZnO/Ag structures. UV illumination lowers the set voltage while maintaining an ON/OFF ratio of ~106. Electrical characteristics were examined, and UV modulation reduced the programming voltage while still achieving nearly identical PPD index values. | |
| FMCp1-31L | Etching of Dielectric Contact Hole of Thin Film Transistor with Low-GWP Gas *Junsoo Lee1, Junwon Jeong1, Jongwoo Hong1, Geunyoung Yeom1 1. Sungkyunkwan University (Korea) |
| To replace high-GWP (Global Warming Potential) CF4 gas used in advanced display etching, alternative gases such as C2F4O and C2HF3O were investigated. Although their etch rates were slightly lower, C2HF3O demonstrated superior etch characteristics. Especially, the alternatives reduced the GWP by approximately 45% and 84% respectively, making ... | |
| FMCp1-32L | Grayscale-Dependent Spectral Shift in Red Micro LEDs and Physics Informed Modeling of Thermal Carrier Dynamics *Ting-Zhen Chu1, Chen-Ling Tsai1, Pei-Chun Chen1, Xiu-Mei Lu1,2, Yi-Zhen Yu1, Hung-Pin Hsu2, Zi-Yan Zhan1,2, Yu-Qi Tang1, Frank Huang3, Kazuto Nishikawa4, Tsung-Pei Chiang5, Jia-Hui Chen1, Hsin-Liang Lin1, Wei-Tse Pai6, Cheng-Wei Wang7, Junichi Takeya8, Yi-Ping Wang1,7 1. National Taiwan University of Science and Technology (Taiwan), 2. Ming Chi University of Technology (Taiwan), 3. Taiwan Denkei solution Corporation (Taiwan), 4. TechnoOptis Corporation (Japan), 5. Powerview Display Corporation (Taiwan), 6. Da-Yeh University (Taiwan), 7. Industrial Technology Research Institute (Taiwan), 8. The University of Tokyo (Japan) |
| Red micro LEDs are for full color displays but often suffer from spectral drift under varying grayscale driving.GaInP based red micro LEDs and measured using a 2D spectroradiometer. Results reveal a slight blue shift and clear spectral broadening at higher grayscale levels, caused by band filling and thermal effects. | |
| FMCp1-33L | MoS2 Thermal Properties by Raman Spectroscopy with Implications for High Resolution Display Backplane Zi-Yan Zhan1,2, *Yu-Meng Huang1, Xiu-Mei Lu1, Yu-Qi Tang1, Kazuto Nishikawa3, Frank Huang4, Tsung-Pei Chiang5, Pei-Chun Chen1, Chen-Ling Tsai1, Ting-Zhen Chu1, Tung-Lin Kuo1, Hung-Pin Hsu2, Ching-Wei Tung2, Yi-Ping Wang1,6 1. National Taiwan University of Science and Technology (Taiwan), 2. Ming Chi University of Technology (Taiwan), 3. TechnoOptis Co. Ltd (Japan), 4. Taiwan Denkei solution Corporation (Taiwan), 5. Powerview Display Corporation (Taiwan), 6. Industrial Technology Research Institute (Taiwan) |
| Two-dimensional (2D) materials, with exceptional carrier mobility and atomic scale thickness, are promising candidates for high resolution, flexible TFT-based displays. Molybdenum disulfide (MoS2) has attracted industry attention, particularly in emerging Micro LED applications. This research uses temperature dependent Raman spectroscopy to analyze MoS2 structural and thermal properties, advancing next generation display technologies. | |
| FMCp1-34L | Evaluation of Electrical Stability of ITO/PET Conductive Films under Repeated Torsion: Effects of Clamping Method (Bar vs Clip) and Width of Specimen *Hyun Min Cho1, Da Eun Ji1, Gang Yeol Yoo1 1. Korea Electronics Technology Institute (Korea) |
| This study evaluated the reliability of flexible conductive films under repeated torsion by comparing clamping methods (Clip vs. Bar) and specimen widths. After 1000 cycles, Clip clamping caused significant resistance increases and cracks, especially in narrow widths, while Bar clamping suppressed fluctuations. These results identify important parameters for establishing evaluation standards and designing torsion test equipment. | |
| FMCp1-35L | Improvement of Electrical Properties of SiO2 Gate Insulator by Nitric Oxide Plasma Treatment *Yunhui Jang1, Yeojin Jeong1, Junsin Yi1 1. Sungkyunkwan University (Korea) |
| This work investigates the effect of nitric oxide (NO) plasma treatment on PECVD-grown Silicon dioxide (SiO2) gate insulators. Structural analyses (XPS, AFM) and electrical measurements (I-V, C-V) confirm reduced defects such as Si dangling bonds and oxygen-related vacancies. These results demonstrate enhanced dielectric quality of SiO2 thin film. |
Workshop on Inorganic Emissive Display and Phosphors
| Dec. 3 | 13:30-14:30 | Ran 1 | PH1 | Phosphors for General (1) |
| Dec. 4 | 16:00-17:00 | Himawari | PH2/OLED4 | QD Phosphors and Devices |
| Dec. 3 | 15:40-17:00 | Conference Management Room | PHp1 | Phosphors for General (2) |
| Dec. 3 | 15:40-17:00 | Conference Management Room | OLEDp3/PHp2 | QD Technologies |
PH1: Phosphors for General (1)
Dec. 3 13:30-14:30 Ran 1
Chair: Kazuhiko Hara (Shizuoka University)
Co-Chair: Koutoku Ohmi (Tottori Univ.)
| PH1-1
13:30 |
Invited Plant Growth Tremendously Accelerated by New System of Phosphors Converting Sunlight *Takatoshi Seto1, Yuhua Wang1 1. Lanzhou University (China) |
| We have constructed a new reflection typed phosphor-film converting sunlight to deep red for accelerating plant growth. Under our concept “Asymmetric change of 3d-2p hybridization”, Mn4+ deep red emission was much enhanced. Unique green excited deep red phosphor was also produced. Tomato-fruit and chlorella grew +80% and +98%, respectively. | |
| PH1-2
14:10 |
Improve Color Purity and Conversion Efficiency in Full-Color Micro-LEDs Using Quantum Dot-Based Color Conversion Zhi Ting Ye1, *Yen Heng Huang1, Ching Lin Li1, Cheng Yen Wu1, Ching Wen Huang2, Chun Nien Liu3 1. National Chung Cheng University (Taiwan), 2. GM of Advanced Micro Lux Holding Limited HSIP Branch (Taiwan), 3. National Chung Hsing University (Taiwan) |
| This study proposes a color purification film combined with blue Micro-LEDs and CdSe QDs to improve the color purity and light conversion efficiency. The color gamut coverage from 118.9% to 143.8% in the CIE 1931 NTSC color space and from 123.7% to 149.7% in the DCI-P3 color space. |
PH2/OLED4: QD Phosphors and Devices
Special Topic of Interest on Quantum Dot Technologies
Dec. 4 16:00-17:00 Himawari
Chair: Kazuhiko Hara (Shizuoka University)
Co-Chair: Toshiaki Ikuta (SK Materials JNC)
| PH2/OLED4-1
16:00 |
Invited Quantum Dot Display for Automotive *Takafumi Moriyama1, Makoto Kido1, Hirokazu Sasaki1 1. Shoei Chemical Inc. (Japan) |
| Quantum dots are now widely used as the color conversion material for wide color gamut displays such as TVs and monitors. Recently, quantum dots have been gaining attention for automotive displays. Herein, we provide the advantages of quantum dots for automotive applications. | |
| PH2/OLED4-2
16:20 |
Giant Shell Quantum Dots for Printed Color Converters: Enabling Next-Generation Displays Sören Becker1, Sonja Zeller1, Tobias Jochum1, Manuel Gensler1, Armin Wedel1, *Jan S. Niehaus1 1. Fraunhofer Institute for Applied Polymer Research IAP (Germany) |
| Giant shell quantum dots offer high blue absorbance, narrow emission, and excellent quantum yield. Their robust structure enables stability under high photon flux, making them ideal for µLED color conversion. The automated GSQD synthesis, ligand shell modification, and transfer into printable inks for patterned on-chip color converters will be discussed. | |
| PH2/OLED4-3L
16:40 |
Invited High-Yield Synthesis of Multinary Quantum Dots for Tunable Multicolor Emission *Taro Uematsu1, Satoshi Ichikawa1, Tatsuya Hirano1, Kenichiro Asai1, Yui Saeki1, Issei Chiwata1, Shuhei Arita1, Tsukasa Torimoto2, Susumu Kuwabata1 1. Osaka University (Japan), 2. Nagoya University (Japan) |
| High-yield synthesis of cadmium-free multinary quantum dots was achieved by precursor injection, enabling controlled crystal conversion and suppression of by-products. GaSy shell coating with GaCl3 activation produced narrow band-edge photoluminescence with high quantum yield. Furthermore, incorporation of copper tuned emission to the red, demonstrating potential for environmentally benign, color-tunable display materials. |
PHp1: Phosphors for General (2)
Dec. 3 15:40-17:00 Conference Management Room
| PHp1-1 | Synthesis of Tb Coordination Polymers using 4,4'-Bipyridyl as Bridging Ligand and Preparation of Luminescent Thin Films by Wet Process Koki Suyama1, Seiya Kanagawa1, *Naoki Ohtani1 1. Doshisha University (Japan) |
| We prepared mononuclear and multinuclear terbium complexes and evaluated their optical properties, crystal structures, and energy structures. The luminescence efficiency of the Tb coordination polymer with dipivaloylmethane and 4,4'-bipyridyl as bridging ligands was about 67% because the inverse energy transfer from the rare earth ions to the ligands was reduced. | |
| PHp1-2 | Ce3+ Sensitized 0D Cs-Ce-Tb Chloride Nanocrystals for High-Efficiency White LED Applications *Min Ji Kim1, Ji Wan Kim2, Won Bin Im1 1. Hanyang University (Korea), 2. Kyonggi University (Korea) |
| Lanthanide-based 0D Cs3TbCl6 nanocrystals show promise for LEDs and X-ray imaging applications, but their UV-A absorption is limited. Ce3+ doping enhances UV-A absorption and photoluminescence quantum yield via 4f-5d transitions and energy transfer to Tb3+. The improved Cs3CeTbCl6 nanocrystals are suitable for use in white LED devices. | |
| PHp1-3L | Engineering Colloidal Quantum Dots: Using Structural Deformation to Tune Optical Properties *Jong Ah Chae1, Dongju Jung1, Jeong Woo Park1, Wan Ki Bae1 1. Sungkyunkwan University (Korea) |
| Our study demonstrates that structural deformation offers a powerful route to tune the photophysical properties of colloidal quantum dots. Strain-graded QDs (sg-QDs) with abrupt compositional interfaces generate asymmetric compressive strain, which modifies the exciton fine structure and produces accelerated radiative recombination rates, ultranarrow emission linewidths, high photoluminescence quantum yields, and highly pure, directional emission. | |
| PHp1-4L | Effect of Al Addition on the Depth of Electron Trap Levels and Afterglow Characteristics in Sr2MgSi2O7:Eu,Dy Phosphor *Jumpei Kamikawa1, Haruka Nagao1, Hiroko Kominami1, Nobuhisa Fujima1, Kazuhiko Hara1 1. Shizuoka University (Japan) |
| To investigate the influence of constituent elements on the properties of the afterglow phosphor Sr2MgSi2O7 (SMS), Al was added to SMS and the depths of impurity and defect levels were evaluated by first-principles calculations. The results showed that the addition of Al increased the luminescence intensity, reduced the bandgap width, and created a new level near the ... | |
| PHp1-5L | Powder Electroluminescent Device Based on Energy Transfer Between ZnS Phosphor and Perylene Bisimide Derivative toward Stable Red Emission *Yukino Masuda1, Hayato Hagisawa1, Mitsuhiko Morisue2, Shota Tsuneyasu1 1. Tokyo Polytechnic University (Japan), 2. Kyoto Institute of Technology (Japan) |
| Powder electroluminescent (EL) devices exhibit excellent flexibility and processability, offering several advantages for practical applications. In this study, we fabricated an EL device via energy transfer between a ZnS-based phosphor and a perylene bisimide (PDI) derivative, with the aim of achieving stable red emission, which resulted in pink emission. |
OLEDp3/PHp2: QD Technologies
Special Topic of Interest on Quantum Dot Technologies
Dec. 3 15:40-17:00 Conference Management Room
| OLEDp3/PHp2-1 | Ag-In-Ga-S Quantum Dot Color Conversion Layer for Blue Organic Light-Emitting Devices *Seo Young Kim1, Su Been Lee1, Chan Jun Park1, Chang Kyo Kim1, Dae Gyu Moon1 1. Soonchunhyang University (Korea) |
| We evaluated the color conversion behavior of SiO2 encapsulated Ag-In-Ga-S (AIGS) quantum dots (QDs) applied to blue OLEDs. Two QD to encapsulation ratios (5.5:1 and 2:1) were investigated. The thicker encapsulation film (2:1) reduced blue leakage and enhanced conversion efficiency, indicating the critical role of encapsulation thickness. | |
| OLEDp3/PHp2-2 | Polar Molecular Layer-Directed Surface Engineering for Interfacial Energy Reconfiguration in QD-LEDs *Gyu Jin Shin1, Seung Ah Lee1, Geon Han Park1, Jin-Wook Kim1, Jun Hyup Lee1 1. Soongsil University (Korea) |
| We propose a strong dipole-oriented surface engineering strategy using ultrathin self-assembled molecular layers to modulate the interfacial hole injection barriers in QD-LEDs. Bifunctional molecules with polar terminal groups reconfigure the surface energy and dipole orientation, improving the compatibility between PEDOT:PSS and the ITO electrode, and enhancing the charge transport beyond conventional hole injection effects. | |
| OLEDp3/PHp2-3 | Inorganic QLED Hole Injection Layer Using Phosphotungstic and Phosphomolybdic Acid Solid-Solutions *Hyo Jun Kwon1, Won Bin Im1 1. Hanyang University (Korea) |
| We developed a solid-solution inorganic hole injection layer by alloying PMA and PWA for QLEDs. The W-Mo ratio controls energy level alignment, improving conductivity and hole mobility. This reduces turn-on voltage and resolves charge imbalance, enabling efficient charge injection and enhanced device performance. This is the first use of PWA-PMA in QLEDs. | |
| OLEDp3/PHp2-4 | Hybrid Organic-Perovskite Color Conversion Media for Full-Color Displays Siyang Liu1,3, *Bryan Siu Ting Tam1, Fion Sze Yan Yeung1, Guijun Li2, Shou-Cheng Dong4,1, Yen-Hung Lin1 1. The Hong Kong University of Science and Technology (Hong Kong), 2. Shenzhen University (China), 3. Shenzhen University of Information Technology (China), 4. WISPO Advanced Materials (China) |
| Hybrid color-conversion media (CCM) that combine the strong blue absorption of organic materials with the high PLQY and color purity of perovskite quantum dots (PeQDs) are developed. The mixed CCM films demonstrated a blue light absorption of approximately 70%, equivalent to that of a neat organic film, while exhibiting PLQYs of 44% and 42% for green and red color, respectively. | |
| OLEDp3/PHp2-5 | Dual-Functional Quantum Dot Light-Emitting Diodes as Simultaneous Light Sources and Sensors *DongSeok Shin1 1. Soonchunhyang University (Korea) |
| In this study, we aim to implement the dual functions of quantum dot light-emitting diode and light sensor in a single device. We fabricated an inverted structure quantum dot light-emitting diode, introduced a polyethylenimine interlayer, and changed the thickness of TCTA to optimize the current efficiency and light output. Analyses were performed based on measurements of light emission and the photovoltaic characteristics of the fabricated ... |
Workshop on OLED Displays and Related Technologies
| Dec. 4 | 9:00-10:20 | Himawari | OLED1 | OLED Materials |
| Dec. 4 | 10:50-12:10 | Himawari | OLED2 | OLED Panel Technologies |
| Dec. 4 | 14:10-15:10 | Himawari | OLED3 | Device Analyses and Physics |
| Dec. 4 | 16:00-17:00 | Himawari | PH2/OLED4 | QD Phosphors and Devices |
| Dec. 5 | 9:00-10:20 | Himawari | OLED5 | OLED Displays |
| Dec. 5 | 10:50-12:10 | Himawari | OLED6 | Advanced Technologies (1) |
| Dec. 5 | 14:10-15:30 | Himawari | OLED7 | Advanced Technologies (2) |
| Dec. 3 | 13:50-15:10 | Conference Management Room | OLEDp1 | OLED Device Technologies |
| Dec. 3 | 15:40-17:00 | Conference Management Room | OLEDp2 | OLED Manufacturing |
| Dec. 3 | 15:40-17:00 | Conference Management Room | OLEDp3/PHp2 | QD Technologies |
OLED1: OLED Materials
Dec. 4 9:00-10:20 Himawari
Chair: Takahisa Shimizu (NHK)
Co-Chair: Ken-ichi Nakayama (Osaka Univ.)
| OLED1-1
9:00 |
Invited Toward Next-Generation Light-Emitting Materials for OLEDs: Fast Spin Conversion and Narrowband Emission *Takuma Yasuda1 1. Kyushu University (Japan) |
| This paper introduces the design, synthesis, and photophysical properties of advanced light-emitting materials for OLEDs. Particularly, we focus on OLEDs utilizing such emitters that are capable of both achieving narrowband emission and fast spin conversion. | |
| OLED1-2
9:20 |
Invited Development of High Efficiency and Long Lifetime Fluorescent Blue OLED Devices Using Dual HT and Dual BH Structure *Kengo Kishino1, Satomi Tasaki1, Masato Nakamura1, Tsukasa Sawato2, Yu Kudo1, Kazuki Nishimura1, Tomonori Nakamura1, Emiko Kambe1 1. Idemitsu Kosan (Japan), 2. Idemitsu Advanced Materials Korea (Korea) |
| We report our progress of the enhancing internal quantum efficiency and light extraction efficiency by using Dual HT and Dual BH system. A bottom-emission (BE) device achieved an external quantum efficiency (EQE) of 16.3%, while a top-emission (TE) device demonstrated a brightness index (BI) of 350. | |
| OLED1-3
9:40 |
Invited Plasmonic PHOLEDs for the Next Generation OLED Displays *Haridas Mundoor1, Michael A Fusela1, Renata Saramak1, Vinod M Menon1, Nicholas J Thompson1, Michael S Weaver1, Julia J Brown1 1. Universal Display Corporation (United States of America) |
| Plasmonic PHOLEDs, offer enhanced device efficiency and stability by utilizing the surface plasmon modes. Here we demonstrate the emission tunability by tuning the nano particle arrangement in the outcoupling layer and discuss the potential application in current and future display devices. | |
| OLED1-4
10:00 |
High Efficiency and Long Lifetime Green Phosphorescence Sensitized OLEDs through Optimizing Exciplex Host System *Nisha Vergineya S1, Pavan Kumar Odugu1, Muruganantham Subramanian1, Hae Ung Kim1, Mi Young Chae1, Jang Hyuk Kwon1 1. Kyung Hee University (Korea) |
| Herein, we report an efficient exciplex host system for green phosphorescent-sensitized fluorescent (PSF) OLEDs, exhibiting high efficiency and long lifetime characteristics. We designed and synthesized new n-type host materials, namely DTTrzDF-1, DTTrzDF-2, and DTTrzDFph-3. With BPP-BCz as the p-type material, an exciplex host was optimized for the PSF device, showing an EQEmax-36.2% with LT95-380h at 5000 cd/m². |
OLED2: OLED Panel Technologies
Dec. 4 10:50-12:10 Himawari
Chair: Hitoshi Kuma (Idemitsu Kosan)
Co-Chair: Kenichi Goushi (Kyushu Univ.)
| OLED2-1
10:50 |
Invited Development of High Color Purity Green OLED Devices for Wide Color Gamut Requirements *Guomeng Li1, Baoyu Li1, Minghan Cai1, Mihwa Ha2, Wonjun Song2, Ying Shen2, Xiujian Zhu2, Xiaoqin Jia3, Yilang Li3, Song Liu3, Yuewei Zhang4, Dongdong Zhang4, Lian Duan4 1. Beijing Visionox Technology Co., Ltd. (China), 2. Kunshan Govisionox Optoelectronics Co., Ltd. (China), 3. Beijing Eternal Material Technology Co., Ltd. (China), 4. Tsinghua University (China) |
| Wide color gamut OLED displays (such as Adobe and BT.2020 standards) are showing broad application markets in multiple fields. In this paper, we fabricated a series of pTSF green devices, the optimal devices exhibit higher color purity, better efficiency performance and better device lifetime than phosphorescent devices. Exhibit obvious performance advantages and application prospects in the development for wide color gamut requirements. | |
| OLED2-2
11:10 |
Invited Delivering Breakthrough Metal Oxide Nanocomposites to Power the Extreme Requirements of Next-Gen Extended Reality, Displays and Sensors *Craig Bandes1, Aaron Krieg1, Neil Pschirer1, Z. Serpil Gonen Williams1 1. Pixelligent Technologies (United States of America) |
| High-refractive index nanocomposite formulations incorporating ZrO2, TiO2 or TiO2-ZrO2 nanoparticles showcase nanoimprinting capabilities for surface-relief gratings tailored for extended reality applications and for microimprinting microlens arrays for OLED devices. The nanocomposites demonstrate refractive index between 1.65 and 2.0 as well as high transparency under visible light and nano- and micro-imprintability at a commercial scale. | |
| OLED2-3
11:30 |
Thermally Induced Nonperiodic Wrinkle Patterns for Light Extraction and Viewing Angle Improvement in TEOLEDs *Yoon-Jeong Choi1, Na Min Kim1, Yoon Seo Jung1, Jeong-Yeol Yoo1, Sung Beom Kim1, Jisoo Kyoung1, Byung Doo Chin1 1. Dankook University (Korea) |
| We propose a lithography-free light extraction strategy for TEOLEDs using a thermally induced wrinkle (buckling) pattern formed on top of the semi-transparent cathode. FDTD simulations identified an optimal buckling height (~20 nm), which was experimentally realized. This approach improves both optical performance and angular color stability without complex processing, providing a scalable solution for future displays. | |
| OLED2-4L
11:50 |
Design and Strategies for BT.2020 with Green TADF OLED MunKi Sim1, Sung-Soo Bae1, Han Kyu Park1, Minjung Jung1, Taehoon Jang1, *Keunchan Oh1 1. Samsung Display (Korea) |
| We present novel boron-based multi-resonance (MR) thermally activated delayed fluorescence (TADF) emitters for high-purity green OLEDs within the BT.2020 color gamut. Four emitters (E1-E4) were synthesized and applied to phosphor-sensitized TADF (PST) architectures. The results highlight the promise of green TADF and PST systems for advanced displays with wide gamut, high efficiency, and stability. |
OLED3: Device Analyses and Physics
Dec. 4 14:10-15:10 Himawari
Chair: Yasunori Kijima (Huawei Techs. Japan)
Co-Chair: Kengo Kishino (Idemitsu Kosan)
| OLED3-1
14:10 |
Invited Charge Injection Materials Enabling Next-Generation Organic Semiconductor Diodes: Low-Voltage Emission and Multi-Functional Operation *Hirohiko Fukagawa1, Taku Oono2, Tsubasa Sasaki2, Seita Kyogoku1, Shintaro Mitsui1, Takuji Hatakeyama3, Takahisa Shimizu2 1. Chiba University (Japan), 2. NHK (Japan), 3. Kyoto University (Japan) |
| Using the charge injection material developed earlier, organic diodes consisting mainly of p-type/n-type semiconductors were realized. The simplified structure eliminates internal energy offsets, enabling low-voltage electroluminescence and dual photoelectric functions. This work highlights how structural minimalism in organic devices can unlock multifunctionality without compromising performance. | |
| OLED3-2
14:30 |
Enhanced Optoelectrical Properties of OLED by Intentionally Manipulating Carrier Concentration through Post-reaction Process *Changhee Lee1, Ryungyu Lee1, Hojin Lee1 1. Soongsil University (Korea) |
| We propose a post-reaction process using acetone- treated ZnO nanoparticle to enhance OLED performance. By reducing oxygen vacancies after cathode deposition, this method improves charge balance and exciton generation, resulting in higher luminance and EQE. The approach is scalable, solution- processable, and compatible with high-resolution OLED fabrication. | |
| OLED3-3
14:50 |
Slow Energy Transfer from Dual Delayed Luminescence System in Red Hyper-fluorescence OLEDs *Nobuto Managaki1, Masashi Tsubuku1, Hiroyuki Kimura1 1. Japan Display Inc. (Japan) |
| The effect of three energy transfer processes on a hyperfluorescence OLED was elucidated by analyzing a time-transient EL. Fast energy transfer is from the singlet states of thermally activated delayed fluorescence while slow energy transfer has two distinct processes that were distinguished by spectral overlapping. The slow energy transfer rate substantially affected the device efficiency. |
PH2/OLED4: QD Phosphors and Devices
Special Topic of Interest on Quantum Dot Technologies
Dec. 4 16:00-17:00 Himawari
Chair: Kazuhiko Hara (Shizuoka University)
Co-Chair: Toshiaki Ikuta (SK Materials JNC)
| PH2/OLED4-1
16:00 |
Invited Quantum Dot Display for Automotive *Takafumi Moriyama1, Makoto Kido1, Hirokazu Sasaki1 1. Shoei Chemical Inc. (Japan) |
| Quantum dots are now widely used as the color conversion material for wide color gamut displays such as TVs and monitors. Recently, quantum dots have been gaining attention for automotive displays. Herein, we provide the advantages of quantum dots for automotive applications. | |
| PH2/OLED4-2
16:20 |
Giant Shell Quantum Dots for Printed Color Converters: Enabling Next-Generation Displays Sören Becker1, Sonja Zeller1, Tobias Jochum1, Manuel Gensler1, Armin Wedel1, *Jan S. Niehaus1 1. Fraunhofer Institute for Applied Polymer Research IAP (Germany) |
| Giant shell quantum dots offer high blue absorbance, narrow emission, and excellent quantum yield. Their robust structure enables stability under high photon flux, making them ideal for µLED color conversion. The automated GSQD synthesis, ligand shell modification, and transfer into printable inks for patterned on-chip color converters will be discussed. | |
| PH2/OLED4-3L
16:40 |
Invited High-Yield Synthesis of Multinary Quantum Dots for Tunable Multicolor Emission *Taro Uematsu1, Satoshi Ichikawa1, Tatsuya Hirano1, Kenichiro Asai1, Yui Saeki1, Issei Chiwata1, Shuhei Arita1, Tsukasa Torimoto2, Susumu Kuwabata1 1. Osaka University (Japan), 2. Nagoya University (Japan) |
| High-yield synthesis of cadmium-free multinary quantum dots was achieved by precursor injection, enabling controlled crystal conversion and suppression of by-products. GaSy shell coating with GaCl3 activation produced narrow band-edge photoluminescence with high quantum yield. Furthermore, incorporation of copper tuned emission to the red, demonstrating potential for environmentally benign, color-tunable display materials. |
OLED5: OLED Displays
Dec. 5 9:00-10:20 Himawari
Chair: Shigeki Naka (University of Toyama)
Co-Chair: Masaya Adachi (Japan Display Inc.)
| OLED5-1
9:00 |
Invited 3D-Stretchable AMOLED-Based Display with Island-Bridge Structure Hao Hang1, Yangyang Wang1, Huihui Meng1, *Zhimin Yan1, Wangfeng Xi1 1. Visionox Technology Inc. (China) |
| In this paper, we have firstly fabricated a variety of stretchable samples with different design parameters for bridge shapes to investigate the main influence factor of stretchability. Then a dynamic stretchable AMOLED prototype with stretching rate exceeding 15% was obtained by meticulously designing the island-bridge structure and investigating the 3D-shape formation process. | |
| OLED5-2
9:20 |
Scalable Submicrometer-Scale OLED Pixelization *Jiwoo Oh1, Tommaso Marcato1, Shuangshuang Zeng2, Zhan-Hong Lin1, Sudhir Kumar1, Chih-Jen Shih1 1. ETH Zurich (Switzerland), 2. Huazhong University of Science and Technology (China) |
| We present the scalable fabrication process of nanoscale organic LED devices that enable an array density of up to 100,000 pixels per inch (ppi) with individual pixel size down to 100 nm. Direct nanopatterning of organic emissive material was realized through self-aligned etching and evaporation through nanoapertures on an ultrathin silicon nitride membrane. | |
| OLED5-3
9:40 |
Industrialization Progress and Outlook of ViP Technology for High-Performance AMOLED Display *Yiming Xiao1,2, Zhendong Ding1, Hui Li1, Zengqiang Xia1, Yuan Yao1, Bowen Yang1, Zhengkui Dong1, Zhao Zu1, Haohan Zhang1, Yongqiang Du1, Xuejing Zhu1, Genmao Huang2, Pengle Dang1, JY Lee1, CC Lee1, Ying Shen2, Zhaoji Peng2, Deqiang Zhang2 1. Hefei Govisionox Technology Co., Ltd. (China), 2. Visionox Technology Inc. (China) |
| ViP (Visionox intelligent Pixelization) is an innovative maskless OLED technology that removes the need for fine metal masks (FMM). Having achieved mass production readiness on Gen6 lines and demonstrated scalability on Gen8.6 substrates, ViP offers higher transmittance, improved panelization, and greater OLED device design freedom, enabling competitive solutions for small to large displays. | |
| OLED5-4
10:00 |
HPCAP: A New Technology for Display Repair Frédéric Raynal1, Louis Caillard1, *Amin M'Barki1, Achille Guitton1, Marc Pascual1, Maroua Ben Haddada1, Nathan Bigan1 1. Hummink (France) |
| In OLED and microLED display repair, HPCaP offers a precise, scalable, and non-destructive solution. Using capillary forces and mechanical resonance, it prints inks with micron to sub-micron accuracy—enabling reliable restoration of high-resolution defects where other methods fall short. |
OLED6: Advanced Technologies (1)
Dec. 5 10:50-12:10 Himawari
Chair: Takahiro Komatsu (Canon)
Co-Chair: Kaoru Abe (EneCoat Tech.)
| OLED6-1
10:50 |
Invited Development of New Polymer Donors for Efficient Organic Photovoltaics *Itaru Osaka1 1. Hiroshima University (Japan) |
| We report the design and synthesis of a novel building unit, dithienonaphthobisthiadiazole (TNT), where two thiophene rings are fused to naphthobisthiadiazole (NTz), and a series of TNT-based π-conjugated polymers. TNT-based polymers demonstrated improved hole mobilities in OFETs and higher power conversion efficiencies in OPVs. These findings highlight the potential of TNT as a versatile building unit for high-performance organic electronic devices. | |
| OLED6-2
11:10 |
Invited Exciton Binding Energy of Organic Semiconductors *Hiroyuki Yoshida1 1. Chiba University (Japan) |
| Strongly bound excitons in organic semiconductors are essential to the operation of organic optoelectronic devices. We determined the exciton binding energies of 50 organic semiconductors with a precision of 0.1 eV. Through our systematic study, we discovered that the exciton binding energy is one-quarter of the transport gap. We interpret this unexpected relationship using a hydrogen atom model. | |
| OLED6-3
11:30 |
Invited Organic Light-Emitting and Photodetector Devices Based on Donor/Acceptor Stacking *Shigeki Naka1, Masahiro Morimoto1 1. University of Toyama (Japan) |
| Organic multifunctional devices that demonstrate both light-emitting and photovoltaic capabilities have been studied using donor/acceptor (D/A) stacked structures. Through the combination of exciplex formation at the D/A interface, charge-transfer states, and triplet-triplet upconversion, these devices achieve ultralow-voltage luminescence while simultaneously enhancing the efficiency of photovoltaic energy conversion. | |
| OLED6-4L
11:50 |
Core Technologies of Ultra-Thin Thin Film Encapsulation (UT-TFE) for Advanced Foldable AMOLED *MunPyo Hong1,2, Geonhyeong Lee1,2, Sooseong Lee1, Youngku Jin1,2, Gerhard Domann3,2, Daniela Collin3,2 1. Korea University (Korea), 2. FIP-FPM@KU (Korea), 3. Fraunhofer-Institute for Silicate Research (Germany) |
| Ultra-thin thin-film encapsulation (TFE) below 4 µm is demonstrated using two key technologies. |
OLED7: Advanced Technologies (2)
Dec. 5 14:10-15:30 Himawari
Chair: Yutaka Noguchi (Meiji Univ.)
Co-Chair: Yuji Suzaki (Samsung Japan)
| OLED7-1
14:10 |
Invited Robust Full-Surface Bonding Method for Ultra-flexible Organic Photonic Sensor *Tomoyuki Yokota1 1. The University of Tokyo (Japan) |
| We have developed a new bonding technique for wearable electronics, achieving strong, flexible connections with a low temperature. Using this new method, we succeeded in fabricating an ultrathin photoplethysmography sensor by integrating an ultrathin organic photodetector and organic light-emitting diode. | |
| OLED7-2
14:30 |
Invited Wireless Implantable OLED Devices for Metronomic Photodynamic Therapy *Kei Sakanoue1, Yujiro Itazaki2, Katsuhiko Fujita3, Izumi Kiriko4, Kazuhiro Eguchi1, Yutaka Miyazono1, Ryoichi Yamaguchi5, Takasumi Tsunenari2, Takao Sugihara2, Naoto Yonamine2, Keiji Kuwata6, Naoki Kobayashi6, Tsuyoshi Goya6, Katsuyuki Morii6, Hironori Tsujimoto6, Yuji Morimoto2 1. Pleiades Technologies LLC. (Japan), 2. National Defense Medical College (Japan), 3. Kyushu University (Japan), 4. Kyoto University (Japan), 5. Kumamoto industrial Research Institute (Japan), 6. Nippon Shokubai (Japan) |
| We developed a wirelessly powered, implantable OLED device for metronomic photodynamic therapy (mPDT) targeting deep-organ tumors. The 8-mm OLED on a flexible substrate was designed for liver implantation in rats. In vivo experiments demonstrated significant tumor suppression. The device enables uniform illumination via surface emission, validating its feasibility for deep-tissue phototherapy. | |
| OLED7-3L
14:50 |
Novel PM-OLED Display Designs *Peter Levermore1, Rajan Giller1, Ion Forbes1, Zachary Barton1, Sandra Jenatsch2, Balthasar Bluelle2, Adrian Lagenbach2, Beat Ruhstaller2, Andrew Monkman3, Daping Chu1, Donal Bradley1 1. Excyton Limited (UK), 2. Fluxim AG (Switzerland), 3. Durham University (UK) |
| We demonstrate a novel Passive Matrix (PM) OLED display design where each pixel comprises stacked and independently addressable red, green and blue emissive units, which are the display sub-pixels. This novel pixel design enables elegant and more efficient full-colour PM-OLED displays and has the potential to significantly enhance the lifetime and resolution of AM-OLED displays. | |
| OLED7-4L
15:10 |
Exploring Contact Resistance in Ultra-Precise Dispensing for Top-Contact Organic Thin-Film Transistor Fabrication *Spencer Alexander Skinner1, Eva Bestelink1, Ute Zschieschang2, Hagen Klauk2, Radu Sporea1 1. University of Surrey (UK), 2. Max Planck Institute for Solid State Research (Germany) |
| This work discusses the non-linear relationship between channel width and saturated drain current in top-contact organic source-gated transistors (SGTs) fabricated using the XTPL Delta Printing System (DPS) using low temperature annealing. Low-temperature annealing of the deposited ink causes an increase in resistivity to 2447 Ohm/cm, and impacts the relationship between channel width and saturation drain current. |
OLEDp1: OLED Device Technologies
Dec. 3 13:50-15:10 Conference Management Room
| OLEDp1-1 | Optimized Improvement of Greenish Mura on Micro OLED Display Performance *Junbo Wei1, Qishi Liu1, Yinhu Huang1, Pengcheng Lu1, Rongrong Shi1, Na Chang1, Wenbi Ma1, Yuanlan Tian1, Lei Zhan1, Zhe Li1 1. Yunnan Invensight Optoelectronics Technology Co., Ltd. (China) |
| Micro OLED is easy to be affected by high temperature. There is a great impact on performance of Micro-OLED display in production, that looks like Irregularly-shaped color abnormalities under microscope. This phenomenon is called Greenish Mura in this paper. Root cause locks in high temperature of FOC and edge temperature tolerance degree of Active area (AA). Greenish Mura was finally successfully solved by FOC equipment ... | |
| OLEDp1-2 | Design and Optimization of Hemispherical Metastructures for High-Efficiency Top-Emitting OLEDs Sungbeom Kim1, *Sehwan Kim1, Dongyoung Lee1, Jisoo Kyoung1 1. Dankook University (Korea) |
| We investigated light extraction in microcavity-based TEOLEDs using FDTD simulations. Among several internal structures, the hemispherical pattern optimized via Particle Sweep Optimization showed the highest improvement (~86.4%). These results demonstrate that metastructure optimization is effective in reducing optical losses and enhancing light output in high-performance OLED displays. | |
| OLEDp1-3 | A Quantitative Measurement and Evaluation Scheme for Mura of OLEDoS with CRA *Chao Pu1, Yinhu Huang1, Pengcheng Lu1, Shucheng Yang1, Zhao Ma1, Yingbing Zhang1, Lida Li1, Dongjin Shi1, Zhuoyang Xie1, Yi Wang1, Xiufang Wang1 1. Yunnan Invensight Optoelectronics Technology Co., LTD. (China) |
| A quantitative measurement and evaluation scheme for Mura of OLEDoS with CRA is proposed. The existing schemes are not suitable for OLEDoS with CRA. The proposed scheme’s result trend is consistent with the judgment result trend of visual effect of professionals. And the proposed scheme can be used in quantitatively measuring and evaluating the Mura levels of OLEDoS. | |
| OLEDp1-4 | Enhancing Operational Stability of OLEDs via Controlled Electron Leakage Current Prolonging OLED Lifetime by Managing Electron Leakage Pathways *You Na Song1,2, Seungjeong Kim You2, Taekyung Kim2 1. Hongik University (Korea), 2. Kyung Hee University (Korea) |
| This study proposes the incorporation of an ELP featuring high BDE in the anionic state, effectively mitigating HTM degradation and improving the lifetime of OLEDs by controlling electron leakage current. Furthermore, the implementation of an orange ELP enable the realization of long-lifetime white OLEDs. | |
| OLEDp1-5 | Numerical Simluation Analysis into Multi-Pathway Exciton Dynamics in OLEDs Incorporating an Efficiency-Enhancement Layer *Bum June Park1, Taekyung Kim1 1. Kyung Hee University (Korea) |
| In this research, we present a blue non-doped OLED incorporating a PAC-based efficiency-enhancement layer (EEL). Transient and magneto-electroluminescence analyses reveal that the EEL facilitates high-lying reverse intersystem crossing (hRISC), enabling multi-pathway exciton harvesting and significantly enhancing the external quantum efficiency without additional structural complexity. | |
| OLEDp1-6 | Mitigating Temperature-Induced Efficiency Loss at Low Luminance in OLEDs *Yeonju Jeong1, Taekyung Kim2 1. Hongik University (Korea), 2. Kyung Hee University (Korea) |
| Temperature-dependent efficiency loss in TTF-based OLEDs was investigated. Severe EQE reduction was observed at low luminance due to hole accumulation at the EBL/EML interface. Adjusting the ETL composition improved charge balance and reduced the EQE loss, demonstrating an effective strategy to stabilize low-luminance performance under thermal stress. | |
| OLEDp1-7 | Stabilizing Blue Fluorescent OLEDs Using a Pyrene-Based Emitter Through Dual-Channel Exciton Recycling and Electron Leakage Recombination-Assisted Triplet Management *Yi Sak Lee1 1. Hongik University (Korea) |
| To overcome the efficiency-lifetime trade-off in fluorescent OLEDs, we developed a pyrene-based emitter featuring both HLCT and TTF mechanisms. When incorporated as an electron leakage recombination (ELR) layer between the EML and EBL, the device achieved EQE of 7.49% and LT70 of 27 h, compared to the non-ELR device, through dual-channel exciton and charge control. | |
| OLEDp1-8 | Unraveling the Effects of MR-Emitter Structure and Sensitizer Concentration on Device Performance in Phosphor-Sensitized TADF OLEDs *Jihun Hwang1 1. Hongik University (Korea) |
| We examined how MR-TADF emitter properties affect PST OLED performance with varying sensitizer concentrations. Devices with tDPA-DtCzB showed stable efficiency and lifetime due to precise spectral alignment and consistent hole trapping, as supported by trap activation energy (Ea) and trap density of states (tDOS) analysis | |
| OLEDp1-9 | Sterically Shielded Pt (II) Complex for Stable Blue Phosphorescent Organic Light-Emitting Diodes *SeChan Cha1, YoungHun Jung1, JangHyuk Kwon1 1. Kyung Hee University (Korea) |
| For stable blue phosphorescent OLEDs, a new-Pt complex was designed through various molecular simulation methods by considering sterically shielded structure. The device incorporating a new-Pt shows longer device lifetime than reported PtON-TBBI device and phosphorescent sensitized thermally activated delayed fluorescent device shows 34.5% of high maximum external quantum efficiency with low of 0.09. | |
| OLEDp1-10 | Optimization of Bottom Emission Green Organic Light-Emitting Diodes Characteristics by Varying Pollen Substrate Thickness Jian Cheng Bi1, *Jong Seong Lee1, Hyejin Son1, Ji-Hyeon Kwon1, Kyo-Cheol Kang1, Jun-Young Park1, Byeong-Kwon Ju1 1. Korea University (Korea) |
| Eco-friendly substrate based on compressing sunflower pollen was fabricated to make bottom-emitting green organic light-emitting diodes. By controlling the film thickness, we improved the electrical and optical performance of the device. These results shown that controlling the film thickness appropriately will be an effective strategy to improve the performance of eco-friendly optoelectronic devices. | |
| OLEDp1-11 | Eco-Friendly OLED Inkjet Printing with Marangoni Flow-Induced Uniformity and Waveform-Stabilized Jetting *Ji Eun Kim1, Seonmin Lee1, Minsun Kim1, Yoon-Jeong Choi1, Byung Doo Chin1 1. Dankook University (Korea) |
| We designed an eco-friendly binary ink with the following properties: solubility, low toxicity, ejection stability, and drying control. Optimized waveform conditions were set to achieve uniform OLED thin film formation, which shows a stable, single-droplet emission at a piezo-driving condition of 60 V with a 12 µs dwell time. Pattern-lines were successfully printed as OLED emitter pixels with blended ink (EMB:BuB). | |
| OLEDp1-12 | Correlation Study on the Lifetime and Efficiency of OLEDs with Ultra-Thin EML *Eunjeong Bae1,2, Geun Su Choi1,2, Tae Jeong Hwang2, Seung Jae Lee2, Young Hwan Yu2, Byeong-Kwon Ju1, Young Wook Park2 1. Korea University (Korea), 2. Sunmoon University (Korea) |
| In this study, we demonstrate that the efficiency and lifetime of phosphorescent OLEDs are significantly dependent on the recombination zone in the emitting layer. The efficiency and lifetime were analyzed based on the recombination zone in an ultra-thin EML |
OLEDp2: OLED Manufacturing
Dec. 3 15:40-17:00 Conference Management Room
| OLEDp2-1 | Investigation of Gas Characteristics in Micro-Nano Hybrid Structure on MLA via RIE *Tae Jeong Hwang1, Byeong-Kwon Ju2, Young Wook Park1, Eun Jeong Bae2, Geun Su Choi2 1. University of Sun Moon (Korea), 2. Univeristy of KOREA (Korea) |
| The micro-nano hybrid structures were fabricated on the MLA surface by performing the Reactive-ion Etching (RIE) process. Various gases were used, and they showed different shapes of the micro-nanostructures. We investigated the treatment characteristics of the gas and demonstrated that EQE enhancement compared to bare MLA. | |
| OLEDp2-2 | Implementation of Corrugation-Based Light Extraction Structures in OLEDs Through Mechanical Design Strategy *Na Min Kim1, Yoon-Jeong Choi1, Byung Doo Chin1 1. Dankook University (Korea) |
| This study proposes a simple and lithography-free design strategy for enhancing light extraction in top-emitting OLEDs (TEOLEDs). By thermally treating bilayer films composed of materials with mismatched thermal expansion coefficients or elastic moduli, spontaneous periodic surface corrugation is formed. This corrugation structure effectively improves light outcoupling while simplifying the fabrication process compared to conventional methods. | |
| OLEDp2-3 | Practical Combinatorial and Semi-Generative Exploration of OLED Molecules via Organic Electronic Fingerprint *Tae Wook Yang1, Min Chul Suh1 1. Kyung Hee University (Korea) |
| We present a combinatorial molecule generation strategy using Organic Electronic Fingerprints (OEFP) to explore structurally similar candidates from a limited set of references. By selectively varying substructure counts within the OEFP space, we generate chemically valid and structurally analogous molecular variants, enabling efficient QSPR-driven design even under limited data availability. | |
| OLEDp2-4 | Comparative Study of Driving Voltage Characteristics Based on Various CGL Structures in Non-Doping Tandem OLEDs *Seung Jae Lee1 1. Sun Moon University (Korea) |
| Various non-doped charge generation layer (CGL) structures were fabricated for Tandem OLEDs to compare the driving voltage characteristics depending on the electron injection layer (EIL) materials and the type and thickness of inserted metals. The results offer fundamental insights for the future design and optimization of non- doped Tandem OLEDs. | |
| OLEDp2-5 | Influence of RF Sputtering Process Pressure and Stage Rotation Speed on the Optical and Electrical Characteristics of Transparent Electrodes *Younghwan Yu1 1. Sun Moon University (Korea) |
| This study investigates transparent electrodes deposited via RF magnetron sputtering, focusing on the effects of substrate rotation speed and process pressure on optical and electrical characteristics. Changes in refractive index, transmittance, and sheet resistance affected the figure of merit (FOM) and optical path length (OPL) in OLEDs. | |
| OLEDp2-6 | New OLED Concept High Color Conversion Efficiency and Angular Color Fidelity in OC-TE Microcavity OLED Young Rok Kim1, Min Gyu Jun1, *Ajay Nimbalkar1, Min Chul Suh1 1. Kyung Hee University (Korea) |
| Applying the Host-Dopant System to organic color conversion layers (OCCLs) significantly boosted their color conversion efficiency (CCE), outperforming quantum dot (QD) layers and commercial methods. This also improved the angular color fidelity of blue top-emission OLEDs and enhanced viewing angle characteristics due to the OCCL's corrugated surface. | |
| OLEDp2-7 | Voltage Controlled Color Tunable Polymer Tandem OLEDs for High-Resolution Displays *Yunjae Shin1, Ryungyu Lee1, Hojin Lee1 1. Soongsil University (Korea) |
| We propose a color-tunable polymer tandem OLED (PTOLED) capable of dual-color emission from a single pixel by bias polarity control. Field induced charge injection enables selective green and red emission by one subpixel. This approach offers a promising pathway for the realization of high-resolution OLED displays using polymeric materials. | |
| OLEDp2-8 | Transparent Li-doped In2O3 Electrodes Exhibiting Low Work Function for Top-emission Organic Light-emitting Diodes *Ju-Yong Kim1, Lee Hyeon Seok 1, Ye-Jin Shim1, Min-Seo Kim1, Han-ki Kim1, Hwi Kim2, Seungyong Song2 1. Sungkyunkwan University (Korea), 2. Samsung Display Co., Ltd. (Korea) |
| Top-emission OLEDs (TEOLEDs) require transparent cathodes with low resistivity, high transmittance and low work function, but few materials meet all criteria. We report Li-doped In2O3 (LIO) cathode fabricated by co-sputtering, enabling composition control. By optimizing the process, we successfully achieved LIO films with high transmittance, a low work function and stable electrical performance. | |
| OLEDp2-9L | Research on the Preparation Technology and Application of FMM in Large-Scale Evaporative OLED Yixin Yang1, *Dan Chen1, Wei Cai1, Baozhen Ma1 1. Jihua Laboratory (China) |
| Small OLEDs for mobile phones/wearables mass-produced by RGB evaporation face challenges in TV production: FMM misalignment due to heat/gravity effects and complex manufacturing. In this study, seamless tiling of small FMM is proposed to form a large mask that minimizes distortion. The demonstrated 6.7-inch 150-PPI OLED validates the feasibility of a large display. | |
| OLEDp2-10L | Investigation of Electron Injection Layers for Tandem Exciplex Upconversion OLEDs *Amon Mizuno1, Morimoto Masahiro1, Shigeki Naka1 1. University of Toyama (Japan) |
| This study aimed to achieve low-voltage operation of tandem OLEDs by utilizing exciplex upconversion. Electron injection materials for the charge generation layer were investigated, resulting in improved ambient stability and injection efficiency. As a result, the turn on voltage of a two-unit white tandem OLED was successfully reduced to below 3.6 V. | |
| OLEDp2-11L | Exploration of Bisamino-Anthracene Derivatives for Exciplex Upconversion Type Green OLEDs *Sou Kamiya1, Masahiro Morimoto1, Shigeki Naka1 1. University of Toyama (Japan) |
| Seven green triplet-triplet upconversion (TTU) materials were evaluated based on physical properties, and one material with potential for efficient singlet fission (SF) and TTU was selected. OLEDs were fabricated with two acceptors, and exciplex formation and TTU were suggested in one device, indicating emission via the ExUC mechanism. | |
| OLEDp2-12L | Internal Light Extraction by Random Nanostructures with a Current-Stabilizing Buffer Layer for OLEDs *GeunSu Choi1,2, EunJeong Bae1,2, TaeJeong Hwang2, ByeongKwon Ju1, YoungWook Park2 1. Korea University (Korea), 2. Sunmoon University (Korea) |
| We introduce random nanostructures as an internal light-extraction layer for OLEDs and cap them with a current-stabilizing buffer. Systematic variation of nano structure height and buffer thickness shows thin buffers preserve peak EQE, whereas thicker buffers markedly suppress high-current efficiency roll-off, enabling balanced optical gain, electrical stability, and reliability. |
OLEDp3/PHp2: QD Technologies
Special Topic of Interest on Quantum Dot Technologies
Dec. 3 15:40-17:00 Conference Management Room
| OLEDp3/PHp2-1 | Ag-In-Ga-S Quantum Dot Color Conversion Layer for Blue Organic Light-Emitting Devices *Seo Young Kim1, Su Been Lee1, Chan Jun Park1, Chang Kyo Kim1, Dae Gyu Moon1 1. Soonchunhyang University (Korea) |
| We evaluated the color conversion behavior of SiO2 encapsulated Ag-In-Ga-S (AIGS) quantum dots (QDs) applied to blue OLEDs. Two QD to encapsulation ratios (5.5:1 and 2:1) were investigated. The thicker encapsulation film (2:1) reduced blue leakage and enhanced conversion efficiency, indicating the critical role of encapsulation thickness. | |
| OLEDp3/PHp2-2 | Polar Molecular Layer-Directed Surface Engineering for Interfacial Energy Reconfiguration in QD-LEDs *Gyu Jin Shin1, Seung Ah Lee1, Geon Han Park1, Jin-Wook Kim1, Jun Hyup Lee1 1. Soongsil University (Korea) |
| We propose a strong dipole-oriented surface engineering strategy using ultrathin self-assembled molecular layers to modulate the interfacial hole injection barriers in QD-LEDs. Bifunctional molecules with polar terminal groups reconfigure the surface energy and dipole orientation, improving the compatibility between PEDOT:PSS and the ITO electrode, and enhancing the charge transport beyond conventional hole injection effects. | |
| OLEDp3/PHp2-3 | Inorganic QLED Hole Injection Layer Using Phosphotungstic and Phosphomolybdic Acid Solid-Solutions *Hyo Jun Kwon1, Won Bin Im1 1. Hanyang University (Korea) |
| We developed a solid-solution inorganic hole injection layer by alloying PMA and PWA for QLEDs. The W-Mo ratio controls energy level alignment, improving conductivity and hole mobility. This reduces turn-on voltage and resolves charge imbalance, enabling efficient charge injection and enhanced device performance. This is the first use of PWA-PMA in QLEDs. | |
| OLEDp3/PHp2-4 | Hybrid Organic-Perovskite Color Conversion Media for Full-Color Displays Siyang Liu1,3, *Bryan Siu Ting Tam1, Fion Sze Yan Yeung1, Guijun Li2, Shou-Cheng Dong4,1, Yen-Hung Lin1 1. The Hong Kong University of Science and Technology (Hong Kong), 2. Shenzhen University (China), 3. Shenzhen University of Information Technology (China), 4. WISPO Advanced Materials (China) |
| Hybrid color-conversion media (CCM) that combine the strong blue absorption of organic materials with the high PLQY and color purity of perovskite quantum dots (PeQDs) are developed. The mixed CCM films demonstrated a blue light absorption of approximately 70%, equivalent to that of a neat organic film, while exhibiting PLQYs of 44% and 42% for green and red color, respectively. | |
| OLEDp3/PHp2-5 | Dual-Functional Quantum Dot Light-Emitting Diodes as Simultaneous Light Sources and Sensors *DongSeok Shin1 1. Soonchunhyang University (Korea) |
| In this study, we aim to implement the dual functions of quantum dot light-emitting diode and light sensor in a single device. We fabricated an inverted structure quantum dot light-emitting diode, introduced a polyethylenimine interlayer, and changed the thickness of TCTA to optimize the current efficiency and light output. Analyses were performed based on measurements of light emission and the photovoltaic characteristics of the fabricated ... |
Workshop on 3D/Hyper-Realistic Displays and Systems
| Dec. 3 | 13:30-14:50 | Cosmos 2 | 3D1 | Holography (1) |
| Dec. 3 | 15:20-16:40 | Cosmos 2 | 3D2 | Holography (2) |
| Dec. 3 | 17:10-18:30 | Cosmos 2 | 3D3/VHF2 | Cognitive Science of 3D Systems |
| Dec. 4 | 9:00-10:20 | Cosmos 2 | 3D4 | Optics and 3D Systems |
| Dec. 4 | 14:10-15:10 | Cosmos 2 | DES3/3D5 | 3D Data Compression |
| Dec. 4 | 16:00-17:20 | Cosmos 2 | 3D6 | AI and 3D Systems |
| Dec. 5 | 9:00-10:20 | Cosmos 2 | VHF5/3D7 | Ergonomics of Virtual Images |
| Dec. 5 | 10:50-12:10 | Cosmos 2 | 3D8 | 3D/Hyper-Realistic Applications |
| Dec. 5 | 14:10-15:30 | Cosmos 2 | 3D9 | Holographic Media |
| Dec. 5 | 16:00-17:20 | Cosmos 2 | 3D10 | Light Field Display |
| Dec. 4 | 11:10-12:30 | Conference Management Room | 3Dp1 | 3D/Hyper-realistic Displays and Applications |
| Dec. 5 | 11:10-12:30 | Conference Management Room | VHFp2/3Dp2 | Ergonomics of Realistic Gaming Images |
| Dec. 5 | 11:10-12:30 | Conference Management Room | 3Dp3/INPp3 | Interactive Technologies and 3D/Hyper-realistic Displays |
3D1: Holography (1)
Dec. 3 13:30-14:50 Cosmos 2
Chair: Yuji Sakamoto (Hokkaido Univ.)
Co-Chair: Kazuhiro Yamaguchi (Suwa Univ. Sci.)
| 3D1-1
13:30 |
Invited Low-Voltage and High-Speed Driving of 1-µm-Pixel-Pitch Ferroelectric Liquid Crystal Cell with Holographic Pattern *Yuta Yamaguchi1, Yoshitomo Isomae2, Mayumi Kawana1, Ken-ichi Aoshima1, Masashi Miyakawa1, Ryo Higashida1, Hiroto Sato1, Yoshiaki Kouyama2, Mikio Oka2, Nobuhiko Funabashi1 1. Japan Broadcasting Corporation (Japan), 2. Sony Semiconductor Solutions Corporation (Japan) |
| We demonstrate the optical reconstruction of a holographic image using a fabricated ferroelectric liquid crystal cell comprising 9,600 × 16,000 pixels with a pitch of 1 µm × 1 µm. The cell was driven by low voltage (±0.55 V0-p) and high frequency (1,080 Hz). This demonstrates the potential for realizing a color holographic display capable of reducing speckle noise by superposing multiple images. | |
| 3D1-2
13:50 |
Invited Incoherent Digital Holography Using Geometric Phase Aiming to Capturing Three-Dimensional Moving Object *Tetsuhiko Muroi1, Teruyoshi Nobukawa1, Kei Hagiwara1 1. Japan Broadcasting Corporation (NHK) (Japan) |
| In incoherent digital holography, holograms are generated by the self-interference of object light. By employing geometric phase, multiple phase-shifted holograms for obtaining the complex amplitude distribution can be captured simultaneously. This paper introduces a transmittance-type optical configuration using geometric phase and demonstrates its application in capturing moving objects. | |
| 3D1-3
14:10 |
Color Image Registration Method Combining CMOS Color Image and Incoherent Digital Holography *Norihiko Ishii1, Teruyoshi Nobukawa1, Kei Hagiwara1, Tetsuhiko Muroi1 1. Japan Broadcasting Corporation (Japan) |
| We have developed an image registration technique that overlays the color information obtained from a conventional camera onto the monochrome incoherent digital holography (IDH) image. By employing face detection algorithms, image segmentation methods, and deformable image registration approaches, we successfully generated pseudo-colored IDH images. | |
| 3D1-4L
14:30 |
Ultra-Thin Laser Backlight with Under 0.1-mm Thickness for Holographic Contact Lens Display *Yuto Hayashi1, Fuma Hirata1, Yasuhiro Takaki1 1. Tokyo University of Agriculture and Technology (Japan) |
| We previously proposed two types of ultra-thin laser backlights using single-sided and double-sided holographic optical element (HOE) structures for the holographic contact lens display. In this study, we propose a center HOE structure in which HOEs are sandwiched by two waveguides to improve the quality of emitting laser light by preventing the deterioration of the HOEs. |
3D2: Holography (2)
Dec. 3 15:20-16:40 Cosmos 2
Chair: Tetsuhiko Muroi (NHK)
Co-Chair: Yoshitomo Isomae (Sony Semiconductor Solutions)
| 3D2-1
15:20 |
Invited Holometric Video Streaming for Multiple Users to Simultaneously Experience Free Viewpoints *Yuji Sakamoto1 1. Hokkaido University (Japan) |
| There are technical issues that need to be solved in order to realize a holographic broadcasting system. This paper introduces a “holometric video streaming” that enables multiple users to view images from free viewpoints simultaneously and the current research status, and discuses the remaining future works. | |
| 3D2-2
15:40 |
Design of Complex-information Encoded Phase-modulation-type Computer-generated Hologram *Ryo Higashida1, Masato Miura1, Teruyoshi Nobukawa1, Yuta Yamaguchi1, Ken-ichi Aoshima1, Nobuhiko Funabashi1, Masahiro Yamaguchi2 1. Japan Broadcasting Corporation (NHK) (Japan), 2. Institute of Science Tokyo (Japan) |
| We evaluated the characteristics of a phase-modulation-type computer-generated hologram with complex amplitude information. The phase-modulation CGH demonstrated that the intensity of the reconstructed image can be flexibly controlled within a limited phase modulation range. Moreover, the reconstructed image exhibits reduced noise compared to that produced by a kinoform. | |
| 3D2-3
16:00 |
Holographic Optical Element Fabrication on Curved Surfaces Targeting AR Glasses Lenses *Chuanyu Ma1, Reiji Hattori1, Haozhe Cui1, Kento Matsuo1, Takeshi Kamijo1, Ryuto Koyanagi1, Rui Tan1 1. Kyushu University (Japan) |
| Curved-surface holographic optical elements enable AR glasses with wider FOV and larger eye box. Our photopolymer-based fabrication achieves high diffraction efficiency, ultrathin profiles, and improved optical stability, supporting lightweight, ergonomic AR eyewear without chemical post-processing. | |
| 3D2-4L
16:20 |
Computer-Generated Holograms Using Zoneplates Modulated by Light-Field Based on Viewing-Zone *Amuro Ueno1, Kazuyuki Arimatsu2, Yasutoshi Katsuda2, Makoto Koizumi2, Yusuke Onishi2, Yuichiro Nakamura2, Yasuhiro Takaki1 1. Tokyo University of Agriculture and Technology (Japan), 2. Sony Interactive Entertainment Inc. (Japan) |
| We previously proposed a light-field wavefront conversion technique for computer generated holograms using zoneplates modulated by light-field information. This study modifies the zoneplate modulation scheme so that the amplitude modulation is performed on the viewing-zone plane where light-field information is acquired to enable accurate shading of reconstructed images. |
3D3/VHF2: Cognitive Science of 3D Systems
Special Topic of Interest on Automotive Displays
Dec. 3 17:10-18:30 Cosmos 2
Chair: Sumio Yano (Shimane University)
Co-Chair: Hiroyasu Ujike (Tokyo Information Design Professional University)
| 3D3/VHF2-1
17:10 |
Comparative Evaluation of the 3D Perception in Aerial Images of Real Objects and Flat Images *Hiroto Akazawa1, Munekazu Date2, Haruki Mizushina3, Kenji Yamamoto1 1. Tokushima University (Japan), 2. Tokushima Bunri University (Japan), 3. Shinshu University (Japan) |
| We proposed a method of displaying aerial images of real objects and flat aerial images side by side and comparing the 3D perception.The experimental results show that the aerial image of the real object is perceived as 3D more than the flat aerial image across all conditions. | |
| 3D3/VHF2-2
17:30 |
Subjective Quality Assessment for Cross Reality of 3D CG Projected Video on a Holographic Display Prototype *Norifumi Kawabata1 1. Kanazawa University (Japan) |
| In this study, we created a 3D hologram display prototype, projected 3D CG images, and conducted subjective quality evaluation experiments considering cross reality for the projected images, and examined them from the perspective of the coded image quality assessment. | |
| 3D3/VHF2-3
17:50 |
Usability Evaluation Using Aerial Display by Use of Dual Lens Arrays with a Decorative Sheet *Arisa Sekine1, Takeru Nishiyama1, Shiro Suyama1, Masaru Ishikawa2, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan), 2. LIGHT & IMAGE (Japan) |
| We clarified that a change in usability by manipulating the depth threshold for push-in detection and number of trials in the aerial image by use of a dual lens array from LIGHT&IMAGE. The usability of the aerial image can be perceived as sufficiently high and increases as the number of trials increase. | |
| 3D3/VHF2-4
18:10 |
Holographic Automotive Rearview Replacement *Rolf-Dieter Naske1 1. Metavista3D (Canada) |
| Metavista3D has developed a Holographic Automotive Rearview System. The captured stereo image is transmitted to a processing unit, that generates thousands of perspectives in real time which is a so-called Super-Multiview-technology. The system increases the brightness of the displayed image during darkness in tunnels for example or during the night. |
3D4: Optics and 3D Systems
Dec. 4 9:00-10:20 Cosmos 2
Chair: Keehoon Hong (ETRI)
Co-Chair: Hisayuki Sasaki (NHK Foundation)
| 3D4-1
9:00 |
Invited Development of Dual-Mode Light-Field Video Camera with Switchable Micro-Lens Array *Kyung-Il Joo1, Tae-Hyun Lee1, Jiyeon Kim1, Ki-Dong Lim1, Jung Hoon Choo1, Bu-Jeon Han1, Min-Kyu Park1, Sungjin Lim1, Dong-Kil Lee1, Hak-Rin Kim2 1. Korea Photonics Technology Institute (Korea), 2. Kyungpook National University (Korea) |
| We propose a dual-mode light field video camera using a switchable microlens array (S-MLA), enabling sequential capture of high-resolution 2D and 3D light field images. The system demonstrates depth reconstruction and is suitable for compact imaging platforms such as drones, autonomous vehicles, and robotic vision systems. | |
| 3D4-2
9:20 |
Photodetector-Based Eye Tracking System Based on Limbus Detection for Near-Eye Devices *Haozhe Cui1, Takeshi Kamijo1, Muhamad Affiq Misran1, Kento Matsuo1, Reiji Hattori1 1. Kyushu University (Japan) |
| We present a low-power eye tracking system for AR/VR using non-imaging photodiodes to detect limbus reflectance contrast under IR light. The setup tracks horizontal eye motion via intensity changes at the iris-sclera boundary, validated through experiments and simulations. It offers a compact, efficient alternative to video-based methods. | |
| 3D4-3
9:40 |
Using a Radial DCRA Plate and a LED Display to Create a Wide-Viewing Aerial Display System *Shi-Hwa Huang1, Chien-Yu Chen1 1. National Taiwan University of Science and Technology (Taiwan) |
| This study demonstrates a new radial DCRA aerial display system that can expand the viewing angle. In the experiment, the coordinate system mode of the entire system was rearranged. The results is the viewing angle can be expanded to ±30 degrees; and the aerial image will not disappear completely after deviating from the center line of sight. | |
| 3D4-4
10:00 |
VR-Based Simulator for Aerial Images by Optical See-Through AIRR *Ryota Yamada1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| A VR simulator that reproduces the aerial image generated by an optical see-through AIRR (Aerial Imaging by Retro-Reflection) has been developed. By calculating the viewing angle for each pixel of the virtual aerial image during the rendering process, the quality of this simulator is estimated. The aerial image in the virtual environment can reproduce a similar visible range to the real aerial image in the ... |
DES3/3D5: 3D Data Compression
Special Topic of Interest on Artificial Intelligence and Smart Society
Dec. 4 14:10-15:10 Cosmos 2
Chair: Motohiro Makiguchi (NTT)
Co-Chair: Toshiaki Fujii (Nagoya Univ.)
| DES3/3D5-1
14:10 |
Adaptive Sampling and CNN Based Compression of Point Cloud to Improve Human Recognition of Object Shape *Hideaki Kimata1 1. Kogakuin University (Japan) |
| The geometry of structures is scanned and stored as point clouds. We have previously shown that for simple structures, shape recognition can be improved by adaptive sampling. In this study we propose an improved sampling method and CNN based compression that can be applied to general scenes with structures. | |
| DES3/3D5-2
14:30 |
Complex Hologram Compression Using Factorized Prior *Makoto Sekiguchi1, Cung-Hsuan Huang2, Chau-Jern Cheng2, Fan Wang1, Tomoyoshi Ito1, Tomoyoshi Shimobaba1 1. Chiba University (Japan), 2. National Taiwan Normal University (Taiwan) |
| Recent advances in Computer-Generated Hologram (CGH) resolution have enhanced visual quality but greatly increased data size, limiting practical use. We propose an efficient compression method for digital holograms using deep learning, which achieves superior compression performance and comparative reconstruction quality compared to conventional image compression techniques. | |
| DES3/3D5-3L
14:50 |
Phase Retrieval for Compressing Full-complex Holograms *Satoshi Kozuka1, Chihiro Tsutake1, Keita Takahashi1, Toshiaki Fujii1 1. Nagoya University (Japan) |
| We propose a method for compressing full-complex holograms, where compressible holograms are obtained by solving a phase retrieval problem. |
3D6: AI and 3D Systems
Special Topic of Interest on Artificial Intelligence and Smart Society
Dec. 4 16:00-17:20 Cosmos 2
Chair: Masaru Tsuchida (NTT)
Co-Chair: Chihiro Tsutake (Nagoya Univ.)
| 3D6-1
16:00 |
View Synthesis for Light Field Display with Video Diffusion Network Based on DINO Model *Kailai Shi1, Jian Zhao1,2, Yiming Zhao1, Cuiyan Zhang1, Xing Wang1, Wei Cai1 1. Nanjing Institute of Technology (China), 2. Southeast University (China) |
| Monocular image-based rendering (MIBR) is pivotal for free-view synthesis, generating virtual views from 2D images/videos. However, existing radiance field techs suffer from image quality degradation: edge ghosting, hole artifacts, resolution loss. To address this, we propose a video diffusion network based on DINO model (VDN-D), enhancing clarity/accuracy of novel views. Experiments show VDN-D’s superiority in novel-view synthesis. | |
| 3D6-2
16:20 |
Hologram Generation Leveraging 3D Gaussian Splatting for Computer-Generated Holography *Kai Kumano1, Fan Wang1, Tomoyoshi Ito1, Tomoyoshi Shimobaba1 1. Chiba University (Japan) |
| We proposed an end-to-end pipeline for high-fidelity 3D hologram generation from 2D images. Our method overcame cross-framework incompatibility in CGH by leveraging RGB-D data from 3D Gaussian Splatting and seamlessly integrating it with an ONNX-converted Tensor Holography neural network. This enables direct, modular synthesis and advances scalable, real-time holographic display technologies. | |
| 3D6-3
16:40 |
Verifying the Influence of Visual Guides on Depth Perception of Aerial Images by Use of Depth Estimation AI *Azu Murakami1, Hiroki Takatsuka1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| We have clarified that the area ratio of the guide to the aerial image is related to the depth estimation of the aerial image by using the guide by depth estimation AI. Also, the guide's effect on the perception of a floating image requires surrounding the aerial image with a guide of a real object. Depth perception of the aerial image was not achieved by ... | |
| 3D6-4L
17:00 |
Coded Light Field Imaging for Dynamic Scenes Using Pre-Trained and D-NeRF-Based Reconstruction *Tomoki Inoue1, Chihiro Tsutake1, Keita Takahashi1, Toshiaki Fujii1 1. Nagoya University (Japan) |
| Coded imaging methods are useful for efficiently capturing a light field with a single camera, but they struggle to deal with motions in the scene. In this paper, we propose a method for reconstructing a dynamic light field from coded observation. By combining pre-trained and D-NeRF-based reconstruction, our method can successfully model the scene motions and achieve high-quality reconstruction. |
VHF5/3D7: Ergonomics of Virtual Images
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 5 9:00-10:20 Cosmos 2
Chair: Johan Bergquist (Consultant)
Co-Chair: Haruki Mizushina (Shinshu University)
| VHF5/3D7-1
9:00 |
Invited Approach to Near-Eye Display by Evaluation with Monocular Visual Perception *Sumio Yano1,2 1. Shimane University (Japan), 2. RITECS Inc. (Japan) |
| Under monocular viewing conditions, using an experimental apparatus designed for near-eye displays, we first identified the optimal minimum display viewing angle. Subsequently, we investigated the amplitude distribution and velocity distribution of yawing head movements during viewing. Finally, we clarified the perception of depth distance for virtual images through subjective evaluation experiments and measurements of accommodation responses. | |
| VHF5/3D7-2
9:20 |
Evaluation of Viewing Angle Enhancement on Contact Lens Displays *Haruki Mizushina1,2, Kenji Yamamoto2 1. Shinshu University (Japan), 2. Tokushima University (Japan) |
| We have shown that updating the displayed image in response to eye movements in a contact lens display can produce enhancement effect of effective viewing angle similar to that of a head-mounted display. For the character sizes used in this experiment, a viewing angle enhancement effect can be achieved if the viewing angle of the contact lens display is 5° or more. | |
| VHF5/3D7-3
9:40 |
Estimation of Visual Complement in Scrolling Displays Using PredNet of Natural Images of LED and Aerial Images *Daichi Tasaki1, Akinori Tsuji2, Toyotaro Tokimoto1,3, Masaki Yasugi4, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan), 2. Tokushima University (Japan), 3. XAiX, LLC (Japan), 4. Fukui Prefectural University (Japan) |
| We clarify the visual complementation features of pixel gaps in LED and aerial images using PredNet. PredNet did not predict the scrolling shift in either display type. Although gaps of 1-3 pixels are complemented with white blur, the complementation effect is reduced for gaps of 4 or more pixels, with a greater reduction in aerial displays compared to LED displays. | |
| VHF5/3D7-4L
10:00 |
Invited Color Calibration for Head-Mounted Displays *Killian Duay1, Yoko Mizokami2, Takehiro Nagai1 1. Institute of Science Tokyo (Japan), 2. Chiba University (Japan) |
| Accurate color calibration of head-mounted displays (HMDs) is hindered by hardware optics and rendering pipelines with tone mapping that violate calibration requirements. We present a simple method in Three.js using modular tone mapping, allowing selective deactivation on target objects while preserving realistic global rendering. Validation on three HMDs demonstrates precise color calibration. |
3D8: 3D/Hyper-Realistic Applications
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 5 10:50-12:10 Cosmos 2
Chair: Takafumi Koike (Hosei Univ. / RealImage Inc.)
Co-Chair: Kazuhiro Yamaguchi (Suwa Univ. Sci.)
| 3D8-1
10:50 |
Tailor-Made Tooth Brushing Training Using Virtual Reality *Takeshi Watanabe1, Kotone Yamashita1, Yoshitaka Suzuki1, Kenji Yamamoto1, Yuki Ishihara1 1. Tokushima University (Japan) |
| Tooth brushing is important for preventing oral diseases such as caries and periodontitis. However, it is difficult to maintain motivation. Here, we developed Virtual Reality-based tailor-made tooth brushing training, and a crossover trial was conducted to assess the effectiveness. This training may help people understand their own teeth and maintain motivation for tooth brushing. | |
| 3D8-2
11:10 |
Experiencing Symptoms of Tooth Decay Using Cross-Modal Perception *Naoya Tanigaki1, Takeshi Watanabe1, Keiichiro Watanabe1, Kenji Terada1 1. Tokushima University (Japan) |
| Tooth decay can be prevented by daily brushing; however, it is difficult to maintain motivation. Here, we developed a prevention tool through experiencing tooth decay symptoms using cross-modal perception. Participants who used the tool on a 3D display were asked whether they felt a toothache and whether they wanted to prevent tooth decay. This tool may help motivate people to prevent tooth decay. | |
| 3D8-3
11:30 |
BrickDisplay: Large 3D Image Presentation Perceptually Protruding from Multiple Non-Aligned Heterogeneous Monitors *Yuri Mikawa1, Taiki Fukiage2 1. The University of Tokyo (Japan), 2. NTT Communication Science Laboratories (Japan) |
| We propose a novel display called BrickDisplay, a system that presents large 3D images to perceptually protrude over multiple, non-aligned heterogeneous monitors. BrickDisplay surpasses the conventional tiled display, aligned homogeneous monitors, in its easy installation. This paper presents the calibration and rendering methods of BrickDisplay and evaluates by user study. | |
| 3D8-4L
11:50 |
Content Control in Eye-Tracking Light Field Displays Using Network Technology *Hisayuki Sasaki1, Naoto Okaichi2, Masanori Kano2, Hayato Watanabe2, Yasutaka Maeda2, Takuya Handa2, Kimihiro Tomiyama2 1. NHK Foundation (Japan), 2. NHK (Japan) |
| Currently, the most realistic content service system for eye-tracking light field displays is a download-based system using local rendering. In this paper, we propose a system configuration that enables content control. We also introduce two examples of entertainment content and one for emergency response as practical applications of the proposed system for delivering 3D image content. |
3D9: Holographic Media
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 5 14:10-15:30 Cosmos 2
Chair: Yasuhiro Takaki (Tokyo University of Agriculture and Technology)
Co-Chair: Yuta Yamaguchi (NHK)
| 3D9-1
14:10 |
Invited Holographic Media Technologies for Acquisition, Rendering, and Upscaling *Keehoon Hong1, Kihong Choi1, Wonok Kwon1, Dae-Youl Park1 1. ETRI (Korea) |
| With the goal of implementing holographic media technology, we have developed a set of technologies for real-time hologram acquisition under natural light, FPGA-based hologram rendering, and resolution and frame rate conversion. These technologies are expected to enable real-time holographic media services across various applications and contribute to the practical realization of digital holography. | |
| 3D9-2
14:30 |
Expansion of the Viewing Zone in Holographic Display Using a Light Diffuser with Camera-in-the-Loop Optimization *Shun Matsumoto1, Yushi Hasegawa1, Fan Wang1, Tomoyoshi Ito1, Tomoyoshi Shimobaba1 1. Chiba University (Japan) |
| One of the main challenges in electronic holography is the limited viewing angle. In this study, we present a technique for wide-viewing-angle electronic holography that uses a light diffuser and is optimized through a camera-in-the-loop approach. This approach provides a compact, simple optical configuration while remaining robust with respect to the light diffuser selection. | |
| 3D9-3
14:50 |
Efficient Ray Tracing for Hologram Data Computation Using Fresnel Zone Plate Modulation *Yota Iseki1, Munekazu Date2, Haruki Mizushina3,1, Kenji Yamamoto1 1. Tokushima University (Japan), 2. Tokushima Bunri University (Japan), 3. Shinshu University (Japan) |
| We propose a computational method for efficiently generating hologram data using rendering techniques from the field of computer graphics. In rendering, a fixed number of rays are traced for each angle, and the acquired luminance information is used for amplitude modulation of the Fresnel zone plate. The proposed method displays sharp, shaded 3D images with accurate depth. | |
| 3D9-4
15:10 |
Preliminary Study on Cylindrical HOE Screen Manufactured by Mechanically-Equipped HOE Printer *Kaisei Sugiyama1, Munekazu Date2, Haruki Mizushina3,1, Kenji Yamamoto1 1. Tokushima University (Japan), 2. Tokushima Bunri University (Japan), 3. Shinshu University (Japan) |
| We designed and built a compact HOE printer and examined the diffraction from HOEs it produced. When green collimated light illuminated the flat HOE, a bright vertical diffraction beam emerged. Curving the HOE and repeating the test yielded bright diffraction distributed uniformly across its entire surface. |
3D10: Light Field Display
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 5 16:00-17:20 Cosmos 2
Chair: Munekazu Date (Tokushima Bunri University)
Co-Chair: Masaru Tsuchida (NTT)
| 3D10-1
16:00 |
Optical Design for Super-Multiview Integral 3D Display *Hayato Watanabe1, Naoto Okaichi1, Masanori Kano1, Yasutaka Maeda1, Hisayuki Sasaki2, Kimihiro Tomiyama1 1. NHK (Japan), 2. NHK Foundation (Japan) |
| We propose a novel optical design for an integral three-dimensional (3D) display that satisfies the super-multiview condition. In the proposed method, the density of light rays that form a 3D image is increased in exchange for narrowing the viewing zone to only the periphery of the pupils. We prototyped a display system and verified its display performance. | |
| 3D10-2
16:20 |
Integral 3D Display of Real Objects Based on Multi-View Image Acquisition Using 3D Gaussian Splatting *Michitaka Ono1, Naoto Matsugi1, Masahiro Kawakita1, Norihiko Kawai1 1. Osaka Institute of Technology (Japan) |
| We propose a method for generating integral 3D images using only a single consumer camera and 3D Gaussian Splatting. From casually captured multi-view images, we reconstruct a radiance field and generate virtual-view images. These are converted into elemental images for integral 3D displays, enabling realistic and low-cost 3D visualization of real objects. | |
| 3D10-3
16:40 |
Compact and Wide-FOV True-3D VR Enabled by a Light Field Display Engine with a Telecentric Path *Qimeng Wang1, Yi Liu1, Xinni Xie1, Yaya Huang1, Hao Huang1, Hanlin Hou1, Zong Qin1 1. Sun Yat-Sen University (China) |
| This paper presents a true-3D VR display using a light field display (LFD) engine that generates intermediate images with computational focus cues. A field-sequential-color micro-LCD provides high resolution. The aberration-induced FOV reduction in LFDs is mitigated by a telecentric optical path. Experiments demonstrate clear 3D images with a FOV of over 60 degrees. | |
| 3D10-4
17:00 |
Compact VR Optical System Using a Lens Array *Kento Matsuo1,2, Muhanmad Affiq Bin Misran1, Haozhe Cui1, Chuanyu Ma1, Takeshi Kamijo1, Ryuto Koyanagi1, Yuji Teshima2, Reiji Hattori1 1. Kyushu University (Japan), 2. National Institute of Technology, Sasebo College (Japan) |
| This study proposes a novel, compact, and lightweight optical system for VR devices using a lens array. By supporting curved displays, it can achieve a wide field of view that accommodates eye rotation. A simulated optical system thickness of 14.3 mm was achieved, with the potential for further reduction by using a lens array composed of smaller unit lenses. |
3Dp1: 3D/Hyper-realistic Displays and Applications
Dec. 4 11:10-12:30 Conference Management Room
| 3Dp1-1 | Comparison of Modulation Methods for Generating Complex Holograms from Amplitude Holograms Using Optimization Calculations *Shun Nishijima1, Kosuke Mori1, Kazuma Mori1, Fan Wang1, Tomoyoshi Ito1, Tomoyoshi Shimobaba1 1. Chiba University (Japan) |
| This study proposes a method for generating complex holograms from amplitude holograms using optimization calculations, and verifies methods for modulating object light. The results show that combining axicon or plane wave modulation with optimization calculations is an effective method that achieves both convergence speed and image quality. | |
| 3Dp1-2 | Fast Single-Step Fresnel Diffraction with Minimized Size Change on GPU *Kazuma Mori1, Fan Wang1, Tomoyoshi Ito1, Tomoyoshi Shimobaba1 1. Chiba University (Japan) |
| Single-step Fresnel diffraction is a fast method that obtains the diffraction result with a single Fourier transform. However, it has a drawback in that the sampling pitch changes before and after propagation depending on the calculation parameters. This study mitigates this issue using downsampling and reconstruction, and further accelerates the computation through GPU implementation. | |
| 3Dp1-3 | Angular-Multiplexing-Based Multi-Image Encryption for Holographic Display *Chih-Hao Chuang1, Yi-San Liu1, Hong-Yi Chien1, Nehemiah Chuan-Feng Kuo2, Hsuan-Ting Chang3 1. Feng Chia University (Taiwan), 2. National Taiwan University (Taiwan), 3. National Yunlin University of Science and Technology (Taiwan) |
| This study proposes a modified Gerchberg-Saxton algorithm incorporating spatial and angular multiplexing to address the limitations of narrow viewing angles and image crosstalk in holographic displays. The enhanced algorithm enables more flexible and accurate image reconstruction, significantly improving the display quality and expanding its practical application potential. | |
| 3Dp1-4 | Angular Filter for Computer-Generated Hologram Based on Volume Holographic Grating *Chun Kuan Lee1, Shao Kui Zhou1, Wen Kai Lin2, Wei Chia Su1 1. National Changhua University of Education (Taiwan), 2. Feng Chia University (Taiwan) |
| This study proposes a one-dimensional angular filter based on the Bragg angular selectivity of a volume holographic grating (VHG), which effectively suppresses the DC noise and higher-order diffraction in computer-generated hologram (CGH) displays using a spatial light modulator (SLM). | |
| 3Dp1-5 | Full-Color Holographic Waveguide Display with Hybrid Multiplex Recording *Lin Xin Ru1, Lin Wen Kai2, Zhou Shao Kui1, Su Wei Chia1, Sun Ching Cherng3 1. National Changhua University of Education (Taiwan), 2. Feng Chia University (Taiwan), 3. National Central University (Taiwan) |
| This study proposes a single-waveguide solution for full-color AR display with a 30-degree horizontal field of view (FOV). By employing wavelength and angle multiplexing techniques, it replaces traditional stacked surface-relief-grating waveguides, effectively reducing device size while maintaining full-color capability. | |
| 3Dp1-6 | Virtual Viewpoint Reconstruction Utilizing Monocular Images with Complex Backgrounds *Yiming Zhao1, Jian Zhao2,1 1. Nanjing Institute of Technology (China), 2. Southeast University (China) |
| 3D light field display is promising for realistic 3D representation but generating virtual viewpoints from 2D images has artifacts. This paper presents an algorithm combining neural networks and local boundary restoration. Neural networks generate depth maps with precise boundaries, and a matching algorithm fills occlusions, enabling high - quality virtual viewpoints in complex scenes for better 3D realism. | |
| 3Dp1-7 | Study on the Parallelization of the FFT Module for the Holographic Special-Purpose Computer Using Orthographic Ray-Wavefront Conversion *Itsuki Karube1,2, Yasuyuki Ichihashi1,2, Fan Wang1, Tomoyoshi Shimobaba1, Tomoyoshi Ito1 1. Chiba University (Japan), 2. National Institute of Information and Communications Technology (Japan) |
| To develop the holographic special-purpose computer, we verified the operation of the orthographic ray-wavefront conversion circuit using an FFT IP core provided by AMD Inc. We confirmed that it is possible to process orthographic ray-sampling images of 1024 x 1024 pixels in approximately 3.5 ms by parallelization. | |
| 3Dp1-8 | Near-Eye Display with 80-Degree FOV Based on Multilayer Volume Holographic Lightguide *Yi-Chen Liu1, Ying-Pin Tsai1, Wen-Kai Lin2, Shao-Kui Zhou1, Wei-Chia Su1 1. National Changhua University of Education (Taiwan), 2. Feng Chia University (Taiwan) |
| This paper presents the design of a full-color volume holographic lightguide system with an 80-degree field of view. This work shows the optical design of the lightguide structure and demonstrates its feasibility through fabrication and verification. | |
| 3Dp1-9 | Angular-Multiplexed Master FOV Hologram Based on Multilayer Holographic Films *Yun-Ting Lo1, Ying-Pin Tsai1, Wen-Kai Lin2, Shao-Kui Zhou1, Wei-Chia Su1 1. National Changhua University of Education (Taiwan), 2. Feng Chia University (Taiwan) |
| This study presents an improved angular multiplexing technique based on grating recordings in different film layers. By multiplexing six layers, the angular tolerance for this volume-holographic-optical-element is extended to approximately 16°. Compared with traditional methods, this approach reduces fabrication complexity and technical requirements, greatly enhancing efficiency. | |
| 3Dp1-10 | Viewing Zone Design Independent of Rotational Misalignment Between Parallax Barrier and Display *Taemyong Shin1, Kyosuke Yanagida1, Takafumi Koike1,3, Ken Mashitani, Goro Hamagishi2,3, Hideya Takahashi2,3 1. Hosei University (Japan), 2. Osaka Metropolitan University (Japan), 3. RealImage Inc (Japan) |
| We have developed a viewing zone design method to suppress degradation of 3D image quality caused by rotational misalignment between the parallax barrier and the display. We evaluated our method under no-misalignment conditions by measuring luminance and crosstalk ratio using a conventional eye-tracking algorithm. | |
| 3Dp1-11L | Concave Ellipsoidal Mirror toward 360° Horizontal Viewing Angle in Holographic 3D Display *Yusuke Sando1, Yutaro Goto1, Daisuke Barada2, Toyohiko Yatagai2 1. Osaka Research Institute of Industrial Science and Technology (Japan), 2. Utsunomiya University (Japan) |
| The concave ellipsoidal mirror has two optically conjugated focal points. This geometrical property enables the creation of wavefronts converging to one focal point from all horizontal direction and can be applied to expand the viewing angle in a holographic 3D display. Our optical experiment demonstrates a full 360° horizontal viewing angle. | |
| 3Dp1-12L | Image Quality Enhancement for Directional Volumetric Display Using Wasserstein GAN with Gradient Penalty *Mitsuru Baba1, Shino Shiraki2, Tomoyoshi Shimobaba1, Tomoyoshi Ito1, Atushi Shiraki1 1. Chiba University (Japan), 2. Tokyo Metropolitan University (Japan) |
| A WGAN-GP-based deep learning model is proposed to enhance image quality for directional volumetric displays. The proposed method features a generator that improves voxels and a critic for image scoring. The proposed method demonstrated an outperformance in a proportion of cases, specifically 35.3% for LPIPS, 27.2% for PSNR, and 20.2% for SSIM. | |
| 3Dp1-13L | Analyses of in Line Grating Period in a Waveguide Display System with 2D Exit Pupil Expansion *Chan Tsung Han1 1. National Changhua University of Education (Taiwan) |
| A suitable in-line grating period is discussed for a waveguide display with 2D exit pupil expansion. The maximum in-line grating period is decided to avoid noise diffraction induced by the stray light from the in-coupling grating, and the minimum in-line grating period is decided to avoid image FOV loss | |
| 3Dp1-14L | Lossless Compression of CGH Using Sub-Hologram Resolution Adjustment *Dukhyun Kim1 1. Hokkaido University (Japan) |
| We propose a resolution-controlled sub-hologram approach for lossless compression of computer-generated holograms. By selectively reducing peripheral region resolution in a foveated rendering, the proposed method decreases dynamic range and high-frequency components, leading to improved compression efficiency. Evaluations with five lossless algorithms achieved up to 70% compression for peripheral region. | |
| 3Dp1-15L | Wide-FOV, High-Resolution Self-Interference Holographic Microscope Using Geometric-Phase Holographic Lens for Optical Characterization of a Metalenses *kidong Lim1, Tae-Hyun Lee1,2, Jiyeon Kim1,3, Jung Hun Choo1, Dongkil Lee1, Kyung-Il Joo1, Min-Kyu Park1, Hak-Rin Kim2, Sungjin Lim1 1. Korea Photonics Technology Institute (Korea), 2. Kyungpook National University (Korea), 3. Jeonbuk National University (Korea) |
| In this paper, we propose an analysis technique for the optical characterization of geometric-phase metalenses by extracting phase maps using wide field-of-view (FOV), high-resolution self-interference holography. The proposed system combines the advantages of ptychography and self-interference holography, enabling the extraction of phase profiles of metalenses with wide FOV and high resolution. | |
| 3Dp1-16L | Geometric-Phase Meta-Wavefront Printing System for Fabrication of Freeform Optical Element with Large Aperture *Sungjin Lim1, Tae-Hyun Lee1,2, Jiyeon Kim1,3, Kidong Lim1, Jung Hun Choo1, Dongkil Lee1, Min-Kyu Park1, Kyung-Il Joo1, Hak-Rin Kim2 1. Korea Photonics Technology Institute (Korea), 2. Kyungpook National University (Korea), 3. Jeonbuk National University (Korea) |
| In this paper, we propose a digitally controlled geometric-phase meta-wavefront printing system for fabricating meta-optical elements. By combining a phase-only SLM and polarization-microscope optics, it can overcome the limitations of conventional fabrication methods. Experimental demonstrations of metalens and a phase meta-grating confirm the feasibility of the proposed method. | |
| 3Dp1-17L | Proposal for Two-layer Aerial Image Display *Takehiro Kaneko1, Yasuhiro Takaki1 1. Tokyo University of Agriculture and Technology (Japan) |
| Conventional aerial image displays can produce a single two-dimensional image at a fixed depth position in space. The production of multiple aerial images requires multiple aerial displays. In this study, we propose an aerial image display which can produce two aerial images with a flat form factor by use of polarization. The experimental verification of the proposed technique is shown. | |
| 3Dp1-18L | Accelerating GPU Computation of Phase-Type Computer-Generated Hologram Using SYCL Code Migrated from CUDA *Takumi Ito1, Hashizo Hamada1, Boaz Jessie Jackin1, Harutaka Shiomi1, Naoki Takada1 1. Kochi University (Japan) |
| We implemented CGH computation using SYCL, a heterogeneous programming model enabling a single program to utilize diverse hardware accelerators from different vendors. The SYCL code migrated from CUDA achieved computational performance and image quality comparable to the original CUDA code. | |
| 3Dp1-19L | Simulation Technologies for Phase Modulation Characteristics and Reconstructed Image Quality in High-Resolution LC Spatial Light Modulators for Electronic Holography 3D Display *Hikaru Ishikawa1, Masakazu Nakatani1, Hideo Fujikake1 1. Tohoku University (Japan) |
| To create holographic 3D displays with a wide viewing angle, you need spatial light modulators with very small pixels. However, phase disorder occurs due to electrical and liquid crystals elastic forces from adjacent pixels. The effect of this disorder on image quality is currently unknown. Since a high-precision calculation using the elastic continuum theory is too complex, this study proposes a simplified calculation method to ... | |
| 3Dp1-20L | Rotation Perception by Changing Observation Position for a Face-Like Image with Inverted Concave Depth in Underwater Arc 3D Display *Kensuke Tamano1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| We have clarified that, even in underwater, a face-like image with simple facial parts and inverted concave depths can be perceived as if rotating and tracking observer by changing horizontal observation angle. This result leads to expansion of underwater applications for an arc 3D display. | |
| 3Dp1-21L | A Preliminary Study on Preserving Text Shapes in Diffusion Based Stereoscopic Video Generation from Monocular Images *Kyosuke Yanagida1, Takafumi Koike1,2 1. Hosei University (Japan), 2. RealImage Inc. (Japan) |
| We have developed a method for stereoscopic video generation from monocular images that preserves text overlays. Conventional forward warping distorts roman characters. Our method applies depth-layer decomposition and shifting to construct occlusion masks and then uses diffusion-based inpainting to fill missing regions. Experiments on a custom images containing text dataset show that our method improves readability and maintains stereo consistency. |
VHFp2/3Dp2: Ergonomics of Realistic Gaming Images
Dec. 5 11:10-12:30 Conference Management Room
| VHFp2/3Dp2-1 | Effects of Frame Rate on Accuracy in Shooting Games *Daisuke Kameda1, Munekazu Date1, Harumi Kawamura2, Masahiro Ueno1, Akinori Furuya1, Hiroyuki Kawai1 1. Tokushima Bunri University (Japan), 2. University of Human Arts of Sciences (Japan) |
| In FPS (First Person Shooting) games, the performance was evaluated under three frame rate conditions: 60, 120 and 360 fps. The results showed that shooting accuracy decreased at the frame rate of 360 fps compared to that of 120 fps. Furthermore, it clarified that the performance degraded at frame rates lower than 120 fps due to the influence of hold-type display. | |
| VHFp2/3Dp2-2L | Influence of Background Luminance on Depth Perception in Aerial Images *Miu Shimajiri1, Haruki Mizushina1 1. Shinshu University (Japan) |
| We confirmed that the perceived depth of the aerial image shifted further back as the background luminance increased. We also confirmed that when the contrast between the background and the aerial image was high, the difference between the perceived depth of the aerial image and the physical image position was small, but that the difference rapidly increased when the contrast fell below 0.2. | |
| VHFp2/3Dp2-3L | Effect of Aerial Image Size on Reaching Accuracy *Noa Ito1, Haruki Mizushina1 1. Shinshu University (Japan) |
| This study investigated reaching behavior toward aerial images presented by an Aerial Imaging by Retro-Reflection (AIRR) system. Using an optical motion capture device, we examined the effect of image size on reaching accuracy, showing tendencies toward deeper reaching for larger images and unstable finger positions for smaller ones. |
3Dp3/INPp3: Interactive Technologies and 3D/Hyper-realistic Displays
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 5 11:10-12:30 Conference Management Room
| 3Dp3/INPp3-1L | Algorithmic Improvement for Computer Generated Holography Toward GPU Implementation of Hand-Drawn Interface *Rio Hanyu1, Takashi Nishitsuji1 1. Toho University (Japan) |
| This paper proposes an algorithm for parallel computation on a Graphics Processing Unit (GPU) of computer-generated holograms (CGHs) from hand-drawn input. As a feasibility study, the algorithm was tested on a CPU, showing improved image quality over the existing method. This result confirms the viability of our method for future high-speed implementation on a GPU. | |
| 3Dp3/INPp3-2L | Interactive Holographic Aerial Display for Fingertip Drawing *Naoya Hanaoka1, Yuzuki Nakatani1, Boaz Jessie Jackin1, Harutaka Shiomi1, Haruya Shiba1, Naoki Takada1 1. Kochi University (Japan) |
| We report on an interactive holographic aerial display for drawing fingertip trajectories. The proposed system uses an infrared sensor to capture the fingertip trajectory. We successfully projected the captured fingertip trajectories using a holographic projector and achieved a real image display in real time in aerial space by employing retroreflective material and a half mirror. | |
| 3Dp3/INPp3-3L | Implementation of a Novel Maxwellian Optics and Its Comparison with Conventional Approaches *Shuri Futamura1, Ryuichi Inui1, Tomoki Matsumoto2, Yasuhisa Nakano1, Yuichi Masumoto1, Tatsuji Tokiwa1 1. Hiroshima City University (Japan), 2. Institute of Advanced Media Arts and Sciences (Japan) |
| We propose a novel Maxwellian optical system combining a spherical multi-pinhole (SMP) and a transmissive mirror device (TMD). A prototype was implemented and compared with the conventional flat multi-pinhole (FMP) method. Results demonstrate that SMP provides a wider field of view up to ±45°, while challenges such as moiré remain. | |
| 3Dp3/INPp3-4L | Editing Color Boundaries in Cel-Shaded Volume Rendering *Toshiki Shinju1, Yoshinori Dobashi1,2 1. Hokkaido University (Japan), 2. Prometech CG Research (Japan) |
| We propose a method for editing the color boundaries in cel-shaded volume rendering. From a few user-placed control points, our method determines an appropriate color distance metric to achieve the desired quantization. The approach runs at interactive rates, producing stylized results with adjustable boundaries. |
Workshop on Applied Vision and Human Factors
| Dec. 3 | 13:30-14:50 | Dahlia 2 | INP1/VHF1 | AR/VR Interaction (1) Human-Robot Interaction |
| Dec. 3 | 17:10-18:30 | Cosmos 2 | 3D3/VHF2 | Cognitive Science of 3D Systems |
| Dec. 4 | 14:10-15:30 | Cosmos 1 | VHF3 | Ergonomics of Visibility and Visualization |
| Dec. 4 | 16:00-17:00 | Cosmos 1 | VHF4 | Visual Comfort |
| Dec. 5 | 9:00-10:20 | Cosmos 2 | VHF5/3D7 | Ergonomics of Virtual Images |
| Dec. 5 | 14:10-15:30 | Dahlia 1 | FMC9/VHF6 | Display Measurements and Inspections |
| Dec. 5 | 11:10-12:30 | Conference Management Room | VHFp1 | Visual Ergonomics |
| Dec. 5 | 11:10-12:30 | Conference Management Room | VHFp2/3Dp2 | Ergonomics of Realistic Gaming Images |
| Dec. 5 | 11:10-12:30 | Conference Management Room | INPp1/VHFp3 | Interactive Technologies (1) |
INP1/VHF1: AR/VR Interaction (1) Human-Robot Interaction
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 3 13:30-14:50 Dahlia 2
Chair: Yuichiro Kume (Univ. of Electro-Commun.)
Co-Chair: Masamitsu Harasawa (NHK)
| INP1/VHF1-1
13:30 |
Invited Human Cognitive and Psychological Factors in Teleoperating Industrial Manipulators *Takako Yoshida1 1. Institute of Science Tokyo (Japan) |
| Remote robot manipulation via the internet is subject to unpredictable temporal delays, or “jitter”. This can cause a discrepancy between visual and haptic feedback, which impairs the human operator's sensation, including the sense of agency—the feeling of control over one's actions and outcomes. This paper presents our work on this topic and discusses the critical temporal delay required to maintain the user's ... | |
| INP1/VHF1-2
13:50 |
Invited Inferring Tactile Information via Camera Images *Kazuhiro Shimonomura1 1. Ritsumeikan University (Japan) |
| Tactile image sensors employing cameras have the capability of obtaining rich tactile information through image sequences with high spatial resolution. In recent years, with the development of image analysis technology, such tactile sensors have been used in applications such as robot manipulation, inspection, and human robot interaction. In this paper, we will discuss recent research examples and future directions. | |
| INP1/VHF1-3
14:10 |
Invited Tactile Sensing for Remote Perception *Alexander Schmitz1,2, Sophon Somlor1,2, Tito Pradhono Tomo1,2, Shigeki Sugano2 1. XELA Robotics (Japan), 2. Waseda University (Japan) |
| XELA Robotics provides tactile sensors (uSkin) for robot hands and grippers. Each sensing point occupies an area of about 4x4 mm2, also has a thickness of about 4mm. Each individual sensing point provides 3-axis force output (normal and shear forces) and has digital output to minimize the number of wires, simplifying the integration in robots. The force resolution is 0.1 gf, and at the ... | |
| INP1/VHF1-4
14:30 |
Invited Contact Control for Assembly Tasks Using a Soft Gripper with a Film-Type Tactile Sensor *Yuya Nakanishi1 1. Konica Minolta, Inc. (Japan) |
| To strengthen automation for assembly tasks, a soft gripper combined with a cobot can absorb disturbances from the surrounding environment.We enable the observation of grasped object states by embedding a film-type tactile sensor on a soft gripper.By using the time-rate of change of shear force obtained from this sensor, we can understand the contact conditions crucial for assembly tasks. |
3D3/VHF2: Cognitive Science of 3D Systems
Special Topic of Interest on Automotive Displays
Dec. 3 17:10-18:30 Cosmos 2
Chair: Sumio Yano (Shimane University)
Co-Chair: Hiroyasu Ujike (Tokyo Information Design Professional University)
| 3D3/VHF2-1
17:10 |
Comparative Evaluation of the 3D Perception in Aerial Images of Real Objects and Flat Images *Hiroto Akazawa1, Munekazu Date2, Haruki Mizushina3, Kenji Yamamoto1 1. Tokushima University (Japan), 2. Tokushima Bunri University (Japan), 3. Shinshu University (Japan) |
| We proposed a method of displaying aerial images of real objects and flat aerial images side by side and comparing the 3D perception.The experimental results show that the aerial image of the real object is perceived as 3D more than the flat aerial image across all conditions. | |
| 3D3/VHF2-2
17:30 |
Subjective Quality Assessment for Cross Reality of 3D CG Projected Video on a Holographic Display Prototype *Norifumi Kawabata1 1. Kanazawa University (Japan) |
| In this study, we created a 3D hologram display prototype, projected 3D CG images, and conducted subjective quality evaluation experiments considering cross reality for the projected images, and examined them from the perspective of the coded image quality assessment. | |
| 3D3/VHF2-3
17:50 |
Usability Evaluation Using Aerial Display by Use of Dual Lens Arrays with a Decorative Sheet *Arisa Sekine1, Takeru Nishiyama1, Shiro Suyama1, Masaru Ishikawa2, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan), 2. LIGHT & IMAGE (Japan) |
| We clarified that a change in usability by manipulating the depth threshold for push-in detection and number of trials in the aerial image by use of a dual lens array from LIGHT&IMAGE. The usability of the aerial image can be perceived as sufficiently high and increases as the number of trials increase. | |
| 3D3/VHF2-4
18:10 |
Holographic Automotive Rearview Replacement *Rolf-Dieter Naske1 1. Metavista3D (Canada) |
| Metavista3D has developed a Holographic Automotive Rearview System. The captured stereo image is transmitted to a processing unit, that generates thousands of perspectives in real time which is a so-called Super-Multiview-technology. The system increases the brightness of the displayed image during darkness in tunnels for example or during the night. |
VHF3: Ergonomics of Visibility and Visualization
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 4 14:10-15:30 Cosmos 1
Chair: Takashi Shibata (Tokai University)
Co-Chair: Nobuyuki Hiruma (NHK Foundation)
| VHF3-1
14:10 |
Relationship Between Visual Changes and Visibility of Virtual Character, and Utilization of Blur and Color for AR Display *Yuta Machigashira1, Munekazu Date2, Haruki Mizushina1,3, Kenji Yamamoto1 1. Tokushima University (Japan), 2. Tokushima Bunri University (Japan), 3. Shinshu University (Japan) |
| We conducted sensory tests on the visibility of virtual characters displayed in AR. We changed color of the virtual characters depending on the observer’s gaze position (Colored AR), and we added blur to the virtual characters and changed color of them at the same time (Blurred-Colored AR). Then we compared Colored AR with Blurred-Colored AR on visibility. The results showed that Blurred-Colored AR had ... | |
| VHF3-2
14:30 |
Augmenting Perception of High-Speed Motion with Instant Slow-Motion Visualization Using an Event Camera *Kotoka Matsunaga1, Katsutoshi Masai2, Hideo Saito1 1. Keio University (Japan), 2. Kyushu University (Japan) |
| Understanding unpredictable high-speed phenomena is important. This study presents a system using an event camera to instantly visualize such phenomena and support visual cognition. Experiments show that the system improves usability by automatically detecting phenomena and visualization needs vary by task. These findings highlight the potential of event camera-based visualization. | |
| VHF3-3L
14:50 |
Perceptual Effects of Image Editing using Generative AI for Immersive Viewing in a Free Viewing Task *Leslie Wöhler1, Masamitsu Harasawa1, Yasuhito Sawahata1 1. Japan Broadcasting Corporation (NHK) (Japan) |
| We examined perceptual effects of image editing using generative AI for 360° content viewed on head-mounted display (HMD) and regular screen in a free viewing task. We found that generative AI could successfully change the image impression, though viewers reported worse image quality for edited images. Additionally, eye tracking data indicates subtle differences between the displays. | |
| VHF3-4L
15:10 |
Impact of Indoor Spatial Luminance Distribution on Human Contrast Perception *Lan He1, Yu ning Zhang1,2, Chen hao Hu1, Nai long He1, Bao ping Wang1,2 1. Southeast University (China), 2. Shi Cheng Laboratory for Information Display and Visualization (China) |
| This study measures the variation of the human eye’s contrast sensitivity function under eight typical indoor luminance distribution conditions, formed by combining four illumination levels and two background wall types of different reflectances. The results indicate that human contrast perception is jointly modulated by pupil diameter and spatial luminance ratio with a potential optimal combination relationship. |
VHF4: Visual Comfort
Dec. 4 16:00-17:00 Cosmos 1
Chair: Masamitsu Harasawa (NHK)
Co-Chair: Hiroyasu Ujike (Tokyo Information Design Professional University)
| VHF4-1
16:00 |
Invited Visual Features Evoking Discomfort: Insights from Flickering Patterns *Sanae Yoshimoto1 1. Hiroshima University (Japan) |
| Visual patterns that appear uncomfortable may also carry a potential risk of triggering photosensitive epileptic seizures, highlighting the importance of understanding the visual features that contribute to discomfort. This paper reviews our research using flickering patterns to investigate temporal and chromatic factors that may evoke visual discomfort. | |
| VHF4-2
16:20 |
Contribution of Chromatic Information to Visual Discomfort *Junna Matsumoto1, Aiko Morita1, Arnold J. Wilkins2, Sanae Yoshimoto1 1. Hiroshima University (Japan), 2. University of Essex (UK) |
| Visual discomfort refers to unpleasant sensations caused by visual stimuli. This study used two-color flicker defined in DKL color space to examine whether cone-opponent channels contribute to discomfort. Our results suggest that discomfort from colors that change over time arises at early visual stages, particularly in relation to L/(L+M) modulation. | |
| VHF4-3L
16:40 |
Vertical vs. Rotational Binocular Misalignment in Dichoptic Presentation: Surrounding Effects and Implications for HMDs *Hiroyasu Ujike1,2, Hiroshi Watanabe2 1. Tokyo Information Design Professional University (Japan), 2. National Institute of Advanced Industrial Science and Technology (Japan) |
| We investigated surrounding effects on vertical and rotational binocular misalignment in binocular images to assess the applicability of flat-screen findings to HMDs. Results showed clear effects for vertical but not rotational misalignment, likely reflecting differences in oculomotor tracking. The results provide a basis for developing international guidelines on HMD visual ergonomics. |
VHF5/3D7: Ergonomics of Virtual Images
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 5 9:00-10:20 Cosmos 2
Chair: Johan Bergquist (Consultant)
Co-Chair: Haruki Mizushina (Shinshu University)
| VHF5/3D7-1
9:00 |
Invited Approach to Near-Eye Display by Evaluation with Monocular Visual Perception *Sumio Yano1,2 1. Shimane University (Japan), 2. RITECS Inc. (Japan) |
| Under monocular viewing conditions, using an experimental apparatus designed for near-eye displays, we first identified the optimal minimum display viewing angle. Subsequently, we investigated the amplitude distribution and velocity distribution of yawing head movements during viewing. Finally, we clarified the perception of depth distance for virtual images through subjective evaluation experiments and measurements of accommodation responses. | |
| VHF5/3D7-2
9:20 |
Evaluation of Viewing Angle Enhancement on Contact Lens Displays *Haruki Mizushina1,2, Kenji Yamamoto2 1. Shinshu University (Japan), 2. Tokushima University (Japan) |
| We have shown that updating the displayed image in response to eye movements in a contact lens display can produce enhancement effect of effective viewing angle similar to that of a head-mounted display. For the character sizes used in this experiment, a viewing angle enhancement effect can be achieved if the viewing angle of the contact lens display is 5° or more. | |
| VHF5/3D7-3
9:40 |
Estimation of Visual Complement in Scrolling Displays Using PredNet of Natural Images of LED and Aerial Images *Daichi Tasaki1, Akinori Tsuji2, Toyotaro Tokimoto1,3, Masaki Yasugi4, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan), 2. Tokushima University (Japan), 3. XAiX, LLC (Japan), 4. Fukui Prefectural University (Japan) |
| We clarify the visual complementation features of pixel gaps in LED and aerial images using PredNet. PredNet did not predict the scrolling shift in either display type. Although gaps of 1-3 pixels are complemented with white blur, the complementation effect is reduced for gaps of 4 or more pixels, with a greater reduction in aerial displays compared to LED displays. | |
| VHF5/3D7-4L
10:00 |
Invited Color Calibration for Head-Mounted Displays *Killian Duay1, Yoko Mizokami2, Takehiro Nagai1 1. Institute of Science Tokyo (Japan), 2. Chiba University (Japan) |
| Accurate color calibration of head-mounted displays (HMDs) is hindered by hardware optics and rendering pipelines with tone mapping that violate calibration requirements. We present a simple method in Three.js using modular tone mapping, allowing selective deactivation on target objects while preserving realistic global rendering. Validation on three HMDs demonstrates precise color calibration. |
FMC9/VHF6: Display Measurements and Inspections
Dec. 5 14:10-15:30 Dahlia 1
Chair: Johan Bergquist (Consultant)
Co-Chair: Yuzo Hisatake (Shizuoka University)
| FMC9/VHF6-1
14:10 |
Novel Method for Evaluating Temporal Accuracy on Refresh Rate of Display *Hyunah Suh1, Dongyeol Yeom1, Hyosun Kim1, Yongwoo Yi1, Jaejoong Kwon1 1. Samsung Display (Korea) |
| There are various measurement methods to evaluate FOS (Front-of-Screen) of static images, but few to evaluate the quality of moving images. We developed a new concept called “Temporal accuracy” and also developed the method to calculate temporal accuracy. We found that a high refresh rate does not necessarily lead to excellent temporal accuracy. | |
| FMC9/VHF6-2
14:30 |
Metrology Errors in On- and Off-Axis Curved Displays Caused by Measurement Field Distorted Geometry K Käläntär1,2, Heyder Khalilov2, *Elgün Tağiyev2 1. Global Optical Solutions (Japan), 2. Nakhchivan State University (Azerbaijan) |
| This paper analyzes measurement errors in cylindrical, spherical, and conical surfaces, focusing on both on- and off-axis inaccuracies. It examines how curvature and alignment affect data reliability and proposes strategies to minimize error propagation, improving measurement accuracy in complex geometries. | |
| FMC9/VHF6-3
14:50 |
Design of a 4-Channel Scanning Acoustic Microscopy System with Synthetic Aperture Focusing for High-Resolution Defect Detection in OLED Displays *Hwijin Kim1, Sohyun Won1, Seoyoung Jang1, Heechul Yoon1 1. Dankook University (Korea) |
| This study presents the design of a 4-channel scanning acoustic microscopy (SAM) system incorporating a synthetic aperture focusing (SAF) technique. This method effectively enhances the signal-to-noise ratio (SNR) and reduces sidelobes, enabling clearer visualization of multilayered defects in display manufacturing wafers. | |
| FMC9/VHF6-4L
15:10 |
Evaluation of Display Films Using a Three-Dimensional Optical Wave Field Microscope (3D-OWFM) *Kensaku Shimoda1, Shimon Matsumoto1 1. Otsuka Electronics Co., Ltd. (Japan) |
| In this study, we evaluated display optical films using Three-dimensional Optical Wave Field Microscope (3D-OWFM), which records three-dimensional distributions of complex transmittance. Using 3D-OWFM, we assessed surface profiles and internal refractive-index distributions of the specimens. These results indicate that 3D-OWFM can serve as a complement to existing measurement techniques. |
VHFp1: Visual Ergonomics
Dec. 5 11:10-12:30 Conference Management Room
| VHFp1-1 | Investigating Immersion in 3D Virtual Environments: Effects of Audio-Visual Integration and Congruence *Zhenping Xia1, Kaiyue Zheng1, Saishuai Liu1, Cheng Cheng1 1. Suzhou University of Science and Technology (China) |
| This study explores how different types of audio-visual integration and congruence affect immersion in 3D virtual environments, using IPQ and EEG measures. Results show that congruent audio-visual cues enhance immersion, while incongruent cues may reduce it below visual-only conditions, underscoring the critical role of multisensory coherence in immersive experiences. |
VHFp2/3Dp2: Ergonomics of Realistic Gaming Images
Dec. 5 11:10-12:30 Conference Management Room
| VHFp2/3Dp2-1 | Effects of Frame Rate on Accuracy in Shooting Games *Daisuke Kameda1, Munekazu Date1, Harumi Kawamura2, Masahiro Ueno1, Akinori Furuya1, Hiroyuki Kawai1 1. Tokushima Bunri University (Japan), 2. University of Human Arts of Sciences (Japan) |
| In FPS (First Person Shooting) games, the performance was evaluated under three frame rate conditions: 60, 120 and 360 fps. The results showed that shooting accuracy decreased at the frame rate of 360 fps compared to that of 120 fps. Furthermore, it clarified that the performance degraded at frame rates lower than 120 fps due to the influence of hold-type display. | |
| VHFp2/3Dp2-2L | Influence of Background Luminance on Depth Perception in Aerial Images *Miu Shimajiri1, Haruki Mizushina1 1. Shinshu University (Japan) |
| We confirmed that the perceived depth of the aerial image shifted further back as the background luminance increased. We also confirmed that when the contrast between the background and the aerial image was high, the difference between the perceived depth of the aerial image and the physical image position was small, but that the difference rapidly increased when the contrast fell below 0.2. | |
| VHFp2/3Dp2-3L | Effect of Aerial Image Size on Reaching Accuracy *Noa Ito1, Haruki Mizushina1 1. Shinshu University (Japan) |
| This study investigated reaching behavior toward aerial images presented by an Aerial Imaging by Retro-Reflection (AIRR) system. Using an optical motion capture device, we examined the effect of image size on reaching accuracy, showing tendencies toward deeper reaching for larger images and unstable finger positions for smaller ones. |
INPp1/VHFp3: Interactive Technologies (1)
Special Topic of Interest on Artificial Intelligence and Smart Society
Dec. 5 11:10-12:30 Conference Management Room
| INPp1/VHFp3-1 | Additional Eye-Catching Units for Aerial Signage Display Using Air Blowing, Smell Delivery and Interactive Experiences System *Anna Kamo1, Kunio Sakamoto1 1. Konan University (Japan) |
| The authors have researched floating 3D images which are above the corridor or street, and we hit on the question; Can ones notice what they haven't recognized yet? This paper describes methods to catch ones' attentions using air blowing, smell delivery and air heating and cooling units in our ‘Mirage:’ aerial display system. | |
| INPp1/VHFp3-2 | An Artificial Human Eye Camera for Performance Evaluation of XR Devices Liu Yang1, Xuao Yin1, *Takeo Matsukawa1, Haonan Zhang 1. Goertek Inc. (China) |
| This paper presents an artificial eye camera for key AR/VR image testing and eye tracking challenges. The bionic system uses a front meniscus lens and pupil-structured front aperture, enabling high-resolution imaging (<1.5% distortion) over a 36° full field of view. This biomimetic optical design provides a comprehensive testing solution for optimizing AR/VR optical performance and validating interactive user experiences. | |
| INPp1/VHFp3-3 | A System for Dynamically Evaluating the Accommodation State of the Eye Crystalline Lens *Liu Yang1, Xuao Yin1, Takeo Matsukawa1, Shuai Ma1 1. Goertek Inc. (China) |
| This paper presents a method for estimating eye accommodation based on Purkinje imaging. To address inadequate effective light reflections caused by eye movements and pupil occlusion, a model is developed to match the field of view (FOV) between the light source and camera. A neural network trained on diverse Purkinje images achieves 95% accuracy (±0.1D/±1°), enabling precise AR/VR vari-focal analysis. | |
| INPp1/VHFp3-4 | An Air-Driven Robot that Reproduces Human-Like Speech via Physical Vocal Structures *Yuta Nagai1, Fumiya Kondo1, Atsushi Nakamura1 1. Shizuoka University (Japan) |
| We developed an air-driven speech robot using an artificial lung and reed-type vocal folds. Stable phonation at approximately 100 Hz was achieved with a 150 um reed. The frequency was controllable over a 50 Hz range by adjusting reed length and airflow. This system offers a physical approach to human-like speech reproduction | |
| INPp1/VHFp3-5 | Acquisition of Fingertip Tactile Responses Under Vibratory Stimulation and Examination of Hardness Perception Characteristics Yuta Nagai1, Hayata Iizuka1, Hotaka Sano1, *Atsushi Nakamura1 1. Shizuoka University (Japan) |
| This study investigates fingertip tactile perception under vibration stimuli using textured objects of varying hardness. Acceleration data and subjective ratings were collected. Common vibration frequencies were found in the Z-axis, while X/Y axes showed material-specific patterns. Future work will improve displacement estimation using refined filtering and integration methods. | |
| INPp1/VHFp3-6 | Edge-Optimized Real-Time Sign Language Recognition Using YOLOv5, Signformer, and Physical Neural Networks *Yu-Ju Cheng1, Yu-Wu Wang1, Chi-Yen Huang1 1. National Changhua University of Education (Taiwan) |
| This work proposes a low-cost, real-time ASL translation system for edge devices, integrating YOLOv5 for gesture detection, Signformer for temporal modeling, and PNNs for efficient inference. Achieving 99.31% accuracy on a 14500-image validation set, the system is validated on a laptop and designed for future Raspberry Pi deployment. |
Workshop on Projection and Large-Area Displays and Their Components
| Dec. 3 | 15:20-16:40 | Ran 1 | PRJ1 | Medical Applications and Components |
| Dec. 3 | 17:10-18:30 | Ran 1 | PRJ2 | Projection and Sensing Technologies |
| Dec. 4 | 10:50-12:10 | Ran 1 | PRJ3 | Aerial and Holographic Projection |
| Dec. 4 | 14:10-15:30 | Ran 1 | PRJ4 | User Interaction and Feedback |
| Dec. 4 | 16:00-17:00 | Ran 1 | PRJ5 | XR Technologies |
| Dec. 5 | 14:10-14:50 | Ran 2 | PRJ6 | Emerging Technologies |
| Dec. 5 | 11:10-12:30 | Conference Management Room | PRJp1 | Aerial Displays |
| Dec. 5 | 11:10-12:30 | Conference Management Room | INPp2/PRJp2 | Interactive Technologies (2) |
PRJ1: Medical Applications and Components
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 3 15:20-16:40 Ran 1
Chair: Tetsuji Suzuki (JVC Kenwood)
Co-Chair: Makio Kurashige (Dai Nippon Printing)
| PRJ1-1
15:20 |
Invited The Critical Role of Display Technology in Modern Medical Imaging: Current State and Future Directions Tom Kimpe1, *Raveen Kumaran2 1. Barco NV (Belgium), 2. Barco Visual Solutions inc. (Canada) |
| This invited paper reviews the evolution and critical requirements of medical display technologies, from CRTs to cutting-edge OLEDs and 3D. It emphasizes how factors like luminance, contrast, and color accuracy are crucial for accurate diagnoses, impacting radiologist and pathologist performance and ultimately, patient outcomes. The future of medical displays, including AR/VR, is also explored. | |
| PRJ1-2
15:40 |
Invited Smart Contact Lenses: History and Progress *Dieter Cuypers1, Herbert De Smet1 1. imec and Ghent University (Belgium) |
| Smart contact lenses are an emerging class of devices with the potential to both address medical conditions and provide an alternative augmented reality experience. The technological developments leading to the current status and an outlook on the future are discussed. | |
| PRJ1-3
16:00 |
Waveguide Distributed Bragg Reflectors for Combining RGB Lights from Multimode Laser Diodes *Junichi Inoue1, Akari Watanabe1, Shogo Ura1 1. Kyoto Institute of Technology (Japan) |
| Distributed Bragg reflectors cascaded on a 150-nm-thick Si-N waveguide are proposed and designed to combine red, green, and blue lights from multimode laser diodes (LDs). Optical power throughputs were predicted to be higher than 94% by numerical simulations. | |
| PRJ1-4L
16:20 |
Development of Vascular Structures Extraction Framework Using Infrared Imaging for MRI-Guided Breast Cancer Surgery *Shoma Shirai1, Mizuki Hattori1, Hiroshi Fujimoto1, Yoshihiro Kuroda2, Katsuhiro Nasu3, Hideki Hayashi1, Yukihiro Nomura1, Toshiya Nakaguchi1 1. Chiba University (Japan), 2. University of Tsukuba (Japan), 3. Chiba University Hospital (Japan) |
| We developed a breast cancer surgery support system using a tablet terminal that superimposes magnetic resonance (MR) images on camera images taken of the patient during surgery to assist in determining the extent of resection. In this study, we successfully superimposed vessels both extracted from the MR images and extracted from infrared camera frames, which enabled us to verify the accuracy of the projected resection ... |
PRJ2: Projection and Sensing Technologies
Dec. 3 17:10-18:30 Ran 1
Chair: Satoshi Ouchi (Hitachi)
Co-Chair: Toshiya Nakaguchi (Chiba University)
| PRJ2-1
17:10 |
Invited LUCAS: Overview and In-Orbit Operational Results of Japanese Optical Data Relay Satellite System *Yohei Satoh1, Yutaka Takano1, Shiro Yamakawa1, Takamasa Itahashi1 1. Japan Aerospace Exploration Agency (Japan) |
| Japanese Aerospace Exploration Agency (JAXA) developed and successfully began to operate a next-generation Geo-synchronous orbit satellite (GEO)-based space communication network system “LUCAS”. LUCAS adopts high-speed space optical communication technology in its inter-orbit communication link. In this paper, overview and initial in-orbit operation results of LUCAS are reported | |
| PRJ2-2
17:30 |
Invited Large-Area Projection System with High-Speed Optical Control *Tomohiro Sueishi1 1. Tokyo University of Science (Japan) |
| The finite number of pixels in a fixed projector makes it difficult to present information with both high resolution and large area. High-speed optical control and high-speed visual tracking can solve such trade-off. I will explain several examples of projection systems for large areas by the high-speed techniques; dynamic projection mapping, gaze-oriented and laser-based projection. | |
| PRJ2-3
17:50 |
Material Transformation Through Projection Mapping *Senri Tokiyama1, Riku Teraoka2, Toshiyuki Amano1 1. Wakayama University (Japan), 2. Nara Institute of Science and Technology (Japan) |
| This study proposes projection mapping for material transformation, aiming to change object appearance while preserving its shape. We use NoiseNCA for pattern generation. Our research explored mask processing to maintain the overall structure and methods to reproduce texture gradients. Experiments confirmed the potential of these techniques, leading to a discussion on achieving material replacement | |
| PRJ2-4
18:10 |
Standardization of Measurement of Laser Beam Properties of Collimated Multi-Beam Laser Module for Projector Applications *Junichi Kinoshita1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| Measurement of output laser beam properties of a new laser module with a rectangular 2D array of multiple laser diodes each of which has a collimation optics is described, considering future international standardization. This type of laser module is used for full-frame laser projectors, having a big impact on their downsizing and efficacy improvement. |
PRJ3: Aerial and Holographic Projection
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 4 10:50-12:10 Ran 1
Chair: Yasushi Kobayashi (Panasonic)
Co-Chair: Masashige Suwa (Mitsubishi Elec.)
| PRJ3-1
10:50 |
Invited HoverCanvas: Drone Based Aerial Display Using a Long Range Dynamic Projection *Hiromasa Oku1, Shinpei Yamamoto1 1. Gunma University (Japan) |
| In recent years, technologies for creating aerial displays, such as drone light shows, have garnered significant attention. As a cost-effective method, our group had proposed a cost-effective method for aerial displays named HoverCanvas using a spherical screen suspended by drones and a dynamic projection using a high-brightness projector. This paper reports recent progress of the HoverCanvas. | |
| PRJ3-2
11:10 |
Simulating Distant Aerial Image Presentation Using a Discrete Lens Array and Perceptual Interpolation *Yuri Mikawa1 1. The University of Tokyo (Japan) |
| This paper proposes a method for presenting distant 3D images with a large-aperture lens array. It first introduces black gaps between lenses to eliminate image discontinuities at the lens seam and thus induce perceptual transparency and modal completion. Simulations were conducted to identify the conditions where the method is effective. | |
| PRJ3-3
11:30 |
Voxel Characteristics in Dual-Path Holographic Laser-Based Volumetric Display *Hisashi Oka1, Kota Kumagai2, Kazuki Horikiri1, Masakiyo Sakano1, Keidai Matsuda1, Tetsuji Suzuki1, Yoshio Hayasaki2 1. JVCKENWOOD Corporation (Japan), 2. Utsunomiya University (Japan) |
| A dual-path holographic laser-based volumetric display capable of rendering palmtop-sized graphics was developed. Voxel characteristics were investigated in both Xenon gas and air, revealing superior performance in Xenon. Volumetric graphics rendered by the system are presented. | |
| PRJ3-4
11:50 |
Dot Matrix Color Phosphor Screen with UV Holographic Projector for See-Through Projection Displays Cheng-Huan Chen1, *Hsiu-Yun Kuo1, Po-Hung Yao2,3, Shih-Yu Hong1, Kai-Wen Chang1 1. National Yang Ming Chiao Tung University (Taiwan), 2. Shinesee Art and Technology Co. (Taiwan), 3. Chi Hsiang Optics Co. (Taiwan) |
| A phosphor screen with dot matrix red, green and blue subpixel associated with UV holographic projector based on phase modulation liquid crystal on silicon to generate dot picture pattern matching with the format of the screen has been proposed and demonstrated as a solution for high efficiency colorful see-through display device. |
PRJ4: User Interaction and Feedback
Dec. 4 14:10-15:30 Ran 1
Chair: Dieter Cuypers (Ghent University)
Co-Chair: Kazutoshi Ishida (DNP)
| PRJ4-1
14:10 |
Invited Spatially Augmented Reality (SAR) Technology: From Inception to Commercialization *Aditi Majumder Majumder1,2 1. University of California, Irvine (United States of America), 2. Summit Technology Laboratory (STL) (United States of America) |
| The transition of a technology from concept to real-world depends not only on the innovation, but on the convergence of an ecosystem of hardware, software, infrastructure, and human capital that together create the conditions for it to thrive. This paper presents the journey of Spatially Augmented Reality, that I helped shape for over the past three decades as I transitioned from a student to a ... | |
| PRJ4-2
14:30 |
Comparative Evaluation of Two Immersive Art Spaces Using ECG Data *Ryohei Nakatsu1, Naoko Tosa1, Yasuyuki Uraoka2, Akane Kitagawa2, Koichi Murata2, Tatsuya Munaka2, Yoshiyuki Ueda1, Masafumi Furuta2, Michio Nomura1 1. Kyoto University (Japan), 2. Shimadzu Corporation (Japan) |
| This study examines how two immersive art environments affect viewers’ physiological states. Electrocardiographic (ECG) data revealed that a mirror-based space increased arousal, while an LED-surrounded space promoted relaxation. These results suggest spatial context significantly shapes embodied aesthetic experiences, offering insights into the physiological dimensions of art appreciation. | |
| PRJ4-3
14:50 |
A Study on the Divergence Between Psychological Evaluation and Physiological Indices During Art Viewing in Immersive Art Spaces *Ryohei Nakatsu1, Naoko Tosa1, Yasuyuki Uraoka2, Akane Kitagawa2, Koichi Murata2, Tatsuya Munaka2, Yoshiyuki Ueda1, Masafumi Furuta2, Michio Nomura1 1. Kyoto University (Japan), 2. Shimadzu Corporation (Japan) |
| This study explores the divergence between psychological and physiological responses to art. Two immersive environments were used: one with mirror displays and another with large LED panels. While psychological evaluations showed no significant differences, ECG data indicated that the latter promoted higher parasympathetic activity and lower sympathetic arousal, suggesting a dual-layered structure of art experience. | |
| PRJ4-4
15:10 |
Investigation of Environmental Light Blocking Appearance Manipulation *Ayu Shigeta1, Toshiyuki Amano1 1. Wakayama University (Japan) |
| This study explores appearance control in high-illuminance environments using a transmissive LCD. As a first step, we present results under ideal ambient light. While showing practical potential, contrast between projection and ambient light remains a key challenge. |
PRJ5: XR Technologies
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 4 16:00-17:00 Ran 1
Chair: Toshiyuki Amano (Wakayama University)
Co-Chair: Yoshiaki Kouyama (Sony)
| PRJ5-1
16:00 |
Invited Toward Designing Augmented Reality Head-Mounted Displays for Reducing Physical, Visual, and Cognitive Load *Yuichi Hiroi1 1. Cluster Inc. (Japan) |
| Human perceptual load is a critical constraint in the popularization of augmented reality head-mounted displays (AR-HMDs). In this talk I will present research addressing physical, visual, and cognitive load through three non-traditional approaches: Beaming Display, StainedSweeper, and ChromaGazer, establishing a path toward seamlessly integrating the real and virtual worlds with AR-HMDs. | |
| PRJ5-2
16:20 |
Invited Greatly Expanding the Design-Space of SRG AR-Waveguides: a Human-AI Cooperation Concept *Sébastien de Cunsel1, Kazue Shimizu1 1. Sony Semiconductor Solutions (Japan) |
| Surface-relief grating (SRG) waveguides are widely used for Augmented Reality (AR) head-mounted displays due to their ideal form-factor and transparency. As nanophotonic fabrication methods are progressing, the design-space of periodic nanostructures is constantly expanding. Sony Semiconductor Solutions is pushing the boundaries of SRG waveguide design using its unique AI-based simulation software solution and its hyper-parametrization concept. | |
| PRJ5-3
16:40 |
Single-Layer Full-Color 2D Exit Pupil Expansion Waveguide Based on Ultra-broadband Polarization Volume Gratings for AR HUD *Chuang Wang1, Yishi Weng1, Lili Liu1, Qingyu Li1, Wenjun Xu1, Weiqi Zhou2, Wanchen Zhang1, Jinghan Qiu1, Yuning Zhang1 1. Southeast University (China), 2. Shi-Cheng Laboratory for Information Display and Visualization (China) |
| We propose a diffractive optical waveguide based on ultra-broadband polarization volume gratings (UPVGs), featuring a two-dimensional exit pupil expansion (2D EPE) structure, which enables a 9.8×5° full-color display with single-layer structure. The constructed display system realizes an eye box range of 70*45mm at an eye relief of 300 mm. |
PRJ6: Emerging Technologies
Dec. 5 14:10-14:50 Ran 2
Chair: Makio Kurashige (Dai Nippon Printing)
Co-Chair: Masashige Suwa (Mitsubishi Elec.)
| PRJ6-1L
14:10 |
Novel Analytical Method of High-Gain and Ambient-Light-Suppressing Projection Screens *Xue Li1, Masatake Hayashi1, Siyuan Fan2, Jie Dai2, Qiang Zhong2, Xianrong Liu3, Weidong Liu4, Junichi Osako1, Yoshihiro Oshima1 1. TVS REGZA Corporation (Japan), 2. Qingdao HiFeel Innovative Materials Co., Ltd. (China), 3. Hisense Laser Display Co. (China), 4. Hisense Visual Technology Co. (China) |
| A novel analysis was conducted to find how the factors should be constructed and evaluated to achieve highcontrast projection screens even under bright ambient light situations. Above factors consist of directivity of reflectance, wavelength selectivity of reflectance, especially for laser projectors applications. | |
| PRJ6-2L
14:30 |
Hemispherical Display with 15K-equivalent Projector for 30K 360-degree Video *Yuichi Kusakabe1, Kosuke Nomura1 1. NHK (Japan Broadcasting Corporation) (Japan) |
| A 360-degree video format with 30K × 15K pixels has been internationally standardized as Recommendation ITU-R BT.2123. To comply with this recommendation, a hemispherical display system has been developed consisting of a 15K-equivalent projector, a 3-m-diameter hemispherical screen, and a high-resolution fisheye lens. This display system was demonstrated at our open house in May 2025. |
PRJp1: Aerial Displays
Dec. 5 11:10-12:30 Conference Management Room
| PRJp1-1 | FLOAT Platform System Using Coagulable Syrupy Fluid or Fluffy Cloud-Like Materials for Aero Signage and Spatial Visual Effects *Karin Ikeda1, Kunio Sakamoto1 1. Konan University (Japan) |
| The authors have proposed “flying 3D display units” as a new approach and researched floating 3D images which are in the room and above the corridor or the street. This paper describes ‘FLOAT’ platform system using hemisphere and floating volumetric objects for projection mappings which are arranged and floating in the air. | |
| PRJp1-2 | Deep Learning-Based Pre-Restoration of Blur in Aerial Imaging by Retro-Reflection *Ahmad Aiman Mirza bin Ahmad Zamri1, Sotaro Kaneko1, Hiroki Takatsuka1, Toru Iwane1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| We propose a residual U-Net based pre-restoration network for mild blur restoration in AIRR imaging systems. Our two-phase training with hybrid MSE-SSIM-LPIPS-color loss and differentiable re-blur yields consistent PSNR and SSIM gains over baseline blur. We quantify PSFs and implement deconvolution filters for full-color AIRR displays, clarifying system requirements. | |
| PRJp1-3 | Proposal for the Control of Aerial Image Bending by Use of a Distorted Beam Splitter *Yuka Sato1, Ryosuke Ichikawa1, Sotaro Kaneko1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| We intentionally distorted the beam splitter, a component of the AIRR (aerial imaging by retro-reflection) optical system, to control the bending of the aerial image. Face projection mapping using AIRR enables face painting without causing visual strain, because users are not exposed to direct bright light from the projector. | |
| PRJp1-4 | Reducing External Light Disturbance Using a Louver Film in Arc 3D Display *China Tarauchi1, Kensuke Tamano1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| In arc 3D display, a louver film on the substrate can suppress undesired images by the light from above external sources. Especially, louver film of limiting vertical viewing angle drastically reduces image disturbance from external light while maintaining the desired floating image, improving visibility for road signage applications. | |
| PRJp1-5L | Improvement of Color Uniformity for Volume Holographic Waveguide Display *Yung-Cheng Lu1, Wen-Kai Lin2, Shao-Kui Zhou1, Wei-Chia Su1 1. National Changhua University of Education (Taiwan), 2. Feng Chia University (Taiwan) |
| This study presents a compensation method for color uniformity of diffraction images in a volume holographic waveguide display. By modifying the local amplitude of the external plane light source and by modulating the gray level of each pixel on the LCD panel for this display system, a diffraction image with uniform color and uniform intensity can be obtained. | |
| PRJp1-6L | Portable Projection-based Intuitive Crowd Evacuation Guidance System — Prototype Development and Feasibility Study — *Sayuri Otsuka1, Takashi Nishitsuji1 1. Toho University (Japan) |
| We propose a portable, projection-based evacuation guidance system that leverages vection to intuitively direct crowds without relying on personal devices. A prototype was developed and shown to operate as intended. While the system proved effective in dark environments, enhancements in brightness are required for practical use under ambient light. |
INPp2/PRJp2: Interactive Technologies (2)
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 5 11:10-12:30 Conference Management Room
| INPp2/PRJp2-1 | A Study on Coordinate Transformation for ADAS Information on a Windshield Display *Ai Weng1, Shi-Hwa Huang1, Tzu-An Chou1, Chien-Yu Chen1 1. National Taiwan University of Science & Technology (Taiwan) |
| This study introduces a coordinate transformation framework converting three-dimensional ADAS data into two-dimensional coordinates for windshield HUD projection. A test using four input points forming a rectangle showed the HUD output remained rectangular, confirming geometric consistency. The framework provides theoretical basis and initial validation, enabling future in-vehicle application with real-world data. | |
| INPp2/PRJp2-2 | Phase-Shifted Self-Interference Recording with a Metasurface for a Simplified Incoherent Digital Holography System *Teruyoshi Nobukawa1, Ryo Higashida1, Koki Imamura1, Yasutaka Maeda1, Tetsuhiko Muroi1, Kei Hagiwara1 1. Japan Broadcasting Corporation (NHK) (Japan) |
| A phase-shifted self-interference recording method using a metasurface is proposed to simplify the optical setup of incoherent digital holography. The proposed metasurface enables the generation of four self-interference holograms with different phase shifts under incoherent illumination. The capability for complex amplitude detection using this method was verified through proof-of-concept experiments. | |
| INPp2/PRJp2-3 | A Lightguide-Based Confocal Near-Eye Display System Using Volume Holographic Optical Elements with Refractive Power *Ying-Pin Tsai1,2, Wen-Kai Lin2, Shao-Kui Zhou1, Wei-Chia Su1 1. National Changhua University of Education (Taiwan), 2. Feng Chia University (Taiwan) |
| The use of microprojectors in VR and MR devices requires systems with tunable magnification. This study proposed a lightguide-based system using VHOEs with refractive powers in a confocal configuration, providing magnifications through the ratio between the focal lengths of the VHOEs. Finally, the aberration analysis is performed through simulation. | |
| INPp2/PRJp2-4 | Optical Design for a Virtual-Image Projection Lens with Vertical Exit-Pupil-Expansion *Shang-Da Yang1, Wen-Kai Lin2, Shao-Kui Zhou1, Wei-Chia Su1 1. National Changhua University of Education (Taiwan), 2. Feng Chia University (Taiwan) |
| This study proposes a simplified geometric optical system to achieve vertical exit pupil expansion without using surface relief gratings. By introducing a beam splitter and prism, the design enables vertical pupil expansion. Simulations and experiments confirm its feasibility and potential for compact and efficient optical integration. | |
| INPp2/PRJp2-5L | IMPaCT: Interactive Multi Projection System as a Collaborative Tablets Environment *Kota Someya1, Takashi Nishitsuji1 1. Toho University (Japan) |
| We propose an interactive system that turns physical paper into an interface, acting as a tablet alternative. The system is designed for multi-surface projection in collaborative works settings. To validate our approach, we developed a prototype that allows for the simultaneous operation of two paper interfaces. An evaluation showed a system latency of 300ms and a frame rate of 6.6 fps. |
Workshop on Electronic Papers and Nonvolatile Displays
| Dec. 3 | 13:30-14:50 | Ran 2 | EP1 | Extended Electrophoretic Displays |
| Dec. 3 | 15:20-16:40 | Ran 2 | EP2 | Extended Electrochromic Displays |
| Dec. 3 | 17:10-18:30 | Ran 2 | EP3 | New Technologies for Nonvolatile Displays |
| Dec. 4 | 9:00-10:20 | Ran 2 | EP4 | Novel Electrochromic Materials |
| Dec. 4 | 10:50-11:50 | Ran 2 | EP5 | Electrochromic Device Applications |
| Dec. 4 | 16:20-17:40 | Conference Management Room | EPp1 | e-Paper and Nonvolatile Displays |
EP1: Extended Electrophoretic Displays
Dec. 3 13:30-14:50 Ran 2
Chair: Ming Wang (Amazon Lab126)
Co-Chair: Takahiro Kamei (Sony)
| EP1-1
13:30 |
Invited Low Driving Voltage for E-paper Displays *Alex Henzen1,2,3 1. Henzen Technology B.V. (Netherlands), 2. Henzen Tech FZCO (United Arab Emirates), 3. VisoChrome B.V. (Netherlands) |
| As has been discussed in the past, most e-paper displays need high voltages to switch. Some, like electrochromic displays, use very low voltages but switch slowly. In this paper an overview will be given on the most common e-paper displays and their prospects for low driving voltages. | |
| EP1-2
13:50 |
Invited Laterally Driven Transparent Electrophoretic Display and Microscale Particle Observation via Artificial Intelligence Assisted Optical Tracking *Junjie He1, Zhaoliang Li1, Debo Zeng1, Jinglan Yang1, Hailiang Sheng1, Yue Zhang1, Zimo Zhang1, Guangyou Liu1, Yunhe Liu1, Xinzao Wu1, Shaozhi Deng1, Bo-Ru Yang1 1. Sun Yat-Sen University (China) |
| Laterally driven transparent EPDs (L-TEPDs)—using interdigitated electrodes for horizontal electric fields and particle migration—are a research focus. This paper proposes an artificial intelligence assisted U-Net deep learning method for optical tracking observation on particles, and offers insights to optimize L-TEPDs’ driving and ink formulation. | |
| EP1-3
14:10 |
Invited Transparent Biodegradable Composite Plastic Film from Cellulose Nanofibers *Ying-Chih Liao1 1. National Taiwan University (Taiwan) |
| In this research, we develop a method to create biodegradable food packaging films.The resulting film (Transmittance: 89.4 %, Haze: 2.2 %). The thin film further undergoes esterification crosslinking with citric acid to remove its hydrophilic groups for better water vapor barrier properties. The resulting bio-based packaging film exhibits remarkable transparency, strong biodegradability, and superior gasbarrier properties (water vapor and oxygen). | |
| EP1-4L
14:30 |
Pupillary Light Reflex as a Physiological Measure of Eye Fatigue: Comparing Working on Digital Displays and Paper *Sho Kitamura1, Yuki Saito2, Hirohito Shibata2 1. Livesense Inc. (Japan), 2. Gunma University (Japan) |
| We compared eye fatigue from working on computer displays and paper by measuring the pupillary light reflex in response to flash stimuli. Six participants completed 30-minute visual tasks using either displays or paper. Results showed that the maximum constriction ratio and constriction speed in the pupillary light reflex significantly decreased when working on displays. |
EP2: Extended Electrochromic Displays
Dec. 3 15:20-16:40 Ran 2
Chair: Kazuki Nakamura (Chiba Univ.)
Co-Chair: Masayoshi Higuchi (NIMS)
| EP2-1
15:20 |
Invited Electrochromic Devices Based on Fluorinated Benzyl Viologens for Enhanced Electrochromism and Stability Gaurav Kumar Silori1, *Kuo-Chuan Ho1 1. National Taiwan University (Taiwan) |
| Five fluorine-substituted benzyl viologens (FSBVs) were synthesized to suppress dimerization in electrochromic devices. Among them, the PFBV-based electrochromic device exhibited the best performance. | |
| EP2-2
15:40 |
Withdrawn |
| EP2-3
16:00 |
Invited Flexible Visible-to-NIR Broadband Electrochromic Devices Utilizing Viologen Derivatives *Jong S. Park1 1. Pusan National University (Korea) |
| This work explores flexible visible-to-NIR broadband electrochromic devices using various viologen derivatives. Advancements include π-extended and photocurable viologens, which enable broad spectral control and heat shielding. Addressing leakage and fragility through ion gels and modified electrodes, these robust and flexible devices underscore next-generation smart windows and wearable devices. | |
| EP2-4
16:20 |
Invited Unified Electrochromic-Electroluminescent Interfaces for Seamless MR Integration *Eunkyoung Kim1, Hwandong Jang1, Sinoh Park1, Won-Jae Joo2 1. Yonsei University (Korea), 2. Samsung Electronics (Korea) |
| We present a unified electrochromic-electroluminescent thin-film platform that enables voltage-controlled transitions among transparent, colored, and emissive states. This system supports real-object transmission, virtual-object reflection, and active emission, offering low-power operation and spectral multiplexing for seamless MR display integration. |
EP3: New Technologies for Nonvolatile Displays
Dec. 3 17:10-18:30 Ran 2
Chair: Hidehiko Takanashi (Samsung R&D Institute Japan)
Co-Chair: Bo-Ru Yang (Sun Yat-Sen Univ.)
| EP3-1
17:10 |
Invited Multicolor Electrochromics Using Nanograting Combined with Electrochemical Processes *Jerome Kartham Hyun1, Minji Kim1 1. Ewha Womans University (Korea) |
| To achieve color switching from a reflective monopixel, we explore nanophotonic grating designs integrated with an electrochemical cell based on metal electrodeposition. Electrochemical changes in the dielectric system can manipulate the waveguide-array modes in the grating, offering dynamic transitions in high-contrast colors. We also explore ion insertion processes to improve coloration efficiencies. | |
| EP3-2
17:30 |
Invited Adsorchromism: Molecules with Unique Charge Distribution on the Surface *Miharu Eguchi1 1. Waseda University (Japan) |
| This presentation summarises “adsorchromism” at the surfaces of layered materials. The molecular electronic states undergo changes due to protonation, aggregation, and other processes depending on the surface environment. Understanding the relationship between adsorchromism and the electronic states of molecules on surfaces will enable the induction of desired functions through adsorption alone. | |
| EP3-3
17:50 |
Highly Transparent Gold-Coated Silver-Nanowires Electrodes for On-Skin Electrochromic Displays *Severine De Mulatier1, Ming Jun Lim1, Aiwei Zhao2, Yijun Liu1, Masayochi Higichi2, Naoji Matsuhisa1 1. The University of Tokyo (Japan), 2. National Institute for Materials Science (Japan) |
| In this study, highly transparent electrochromic displays (ECDs) were achieved by using 1) stabilized gold-coated silver nanowires as transparent electrodes, 2) purple-to-transparent Ruthenium-based electrochromic supramolecular polymer, and 3) an NiHCF ion storage layer reducing the working voltage. Final display exhibits high transparency in bleached state, enabling applications that require aesthetically appealing or inconspicuous on-skin devices. | |
| EP3-4
18:10 |
Novel Hybrid Light Reflecting Device Based on Electrochromism and Photonic Structures *Hayata Shirai1, Norihisa Kobayashi1, Kazuki Nakamura1 1. Chiba University (Japan) |
| We present a novel hybrid light reflecting device that integrates electrochromic materials with structural coloration to achieve dynamic and reversible control of reflected light. |
EP4: Novel Electrochromic Materials
Dec. 4 9:00-10:20 Ran 2
Chair: Guofu Zhou (South China Normal Univ.)
Co-Chair: Shuichi Maeda (Tokai University)
| EP4-1
9:00 |
Invited Electrochromic Triphenylamine-Based Near-Infrared Absorbing Dyes *Masafumi Yano1 1. Kansai University (Japan) |
| A series of triphenylamine derivatives with extended π-conjugation were systematically synthesized. These compounds do not absorb visible light or near-infrared light in their neutral state. Upon one-electron oxidation, strong absorption appears in the near-infrared region. This change is reversible, and these molecules can be considered as electrochromic materials for visible/near-infrared light. Details of these molecules will be presented. | |
| EP4-2
9:20 |
Invited Redox Behavior and Electrochromism of a Biscarbazolyl Derivative *Hironobu Tahara1, Tsukasa Ito1, Hiroto Murakami1 1. Nagasaki University (Japan) |
| Bis(3,3′-(9-ethylcarbazolyl)) (biCzEt) shows two reversible oxidations generating an near-infrared (NIR)-active radical cation and a visible-absorbing dication. Dissolving biCzEt with dibutylviologen in the ionic liquid [BMIM][TFSI] yields a colorless electrochromic device that turns blue through complementary 603 nm and 800 nm bands, enabling broadband, single-layer electrochromism for smart windows. | |
| EP4-3
9:40 |
Invited Viologen-based Covalent Organic Framework/Graphene Composites for Enhanced Electrochromic Properties *Jae Uk Choi1, Jinah Jeon2, Pooi See Lee1 1. Nanyang Technological University (Singapore), 2. Korea Advanced Institute of Science & Technology (Korea) |
| Exploring novel materials is crucial for expanding the range of electrochromic materials and enhancing the performance of electrochromic device (ECD) for thermal management and energy storage. In this study, novel 2D viologen-based covalent organic framework (V-COF)/graphene oxide composite has been designed. The incorporation of redox-mediator-included photocurable hydrogel electrolyte was investigated to improve the stability of the ECDs. | |
| EP4-4
10:00 |
Synthesis and Analysis of Ru-Zn Based Metallosupramolecular Polymer with Electrochromic and Electrofluorochromic Properties *Tingwei Zhang1,2, Jena R. Satya1, Masayoshi Higuchi1,2 1. National Institute for Materials Science (Japan), 2. Osaka University (Japan) |
| A Ru-Zn-based metallosupramolecular polymer (polyRuZn) exhibits rapid and reversible electrochromic and electrofluorochromic switching. It shows blue fluorescence under UV light in the oxidized state, quenched upon reduction. Data science tools revealed its fluorescence mechanism, highlighting its promise for multifunctional optoelectronic applications |
EP5: Electrochromic Device Applications
Dec. 4 10:50-11:50 Ran 2
Chair: Nam-Seok Roh (SKYVIEW)
Co-Chair: Yasuo Toko (Stanley Elec.)
| EP5-1
10:50 |
Invited Newly Developed High-Transmittance Resin Electrochromic Dimming Glasses with Prescription Lenses *Takuya Ooyama1, Masahiro Kitamura1 1. Sumitomo Bakelite Co.,Ltd. (Japan) |
| We have realized resin Electrochromic (EC) sheet for prescription glasses by using polycarbonate technologies that our company cultivated for optical applications and the EC sheet/lens processing technologies. This is the first time resin EC consumer device in the world. The developed EC sheet has high transmittance, wide dynamic range, low power consumption, safety and light weight and so on. | |
| EP5-2
11:10 |
Resin Electrochromic (EC) Sheet by Using Three EC Functional Layers and Polycarbonate Substrate, Optical/Material Design and Lens Process Technologies *Masahiro Kitamura1, Tomoki Matsui1, Takuya Ooyama1 1. Sumitomo Bakelite Co.,Ltd. (Japan) |
| We have realized EC sheet for prescription glasses which is the world's first resin EC consumer device[1] by using 1) transparent substrate : polycarbonate as unique material, 2) 3 EC functional layers such as an oxidation layer, a non-liquid electrolyte layer and a reduction layer, 3) Optical and material design of the 3 EC functional layers and 4) Lens process technologies. | |
| EP5-3
11:30 |
Design of Electrochromic Devices Driven by Data Science *Aiwei Zhao1,2, Dines Chandra Santra1, Kenji Nagata1, Junya Sakurai1, Masahiko Demura1, Masayoshi Higuchi1,2 1. National Institute for Materials Science (Japan), 2. Osaka University (Japan) |
| We applied materials informatics and machine learning to design electrochromic metallo-supramolecular polymers (MSPs). Using an orthogonal strategy, high-performance MSPs were synthesized. Models further predicted electrolyte effects on conductivity and coloration efficiency, offering a data-driven approach to optimize EC device performance. |
EPp1: e-Paper and Nonvolatile Displays
Dec. 4 16:20-17:40 Conference Management Room
| EPp1-1 | Development of Electrically Controlled Liquid Metal Optical Device to Improve Aperture Ratio *Reo Tazawa1, Yukihiro Kudoh1, Taiju Takahashi1 1. Kogakuin University (Japan) |
| Development of a light beam control device (LBCD) that enables electrical control of gallium-based liquid metal droplet positioning is currently underway. This device is capable of operating in two modes: reflection and transmission. To achieve unit miniaturization and enhance the aperture ratio, a novel channel structure was proposed and its performance was experimentally evaluated. | |
| EPp1-2 | Variable Transparent POP Display Which Enables to Change Apparent Shape on Frame Design By Polarized Light Controls *Kunio Sakamoto1, Keito Funamoto1, Anna Kamo1, Karin Ikeda1 1. Konan University (Japan) |
| POP cards are useful for eye catchings of customers but they are not reusable because of nonrecyclable design. The authors have researched variable imaging board system for reproducting various shapes. This paper describes variable transparent POP display using a polarization control technique and coloring technology. | |
| EPp1-3L | Observation of Dynamic Color Changes in Electrochromic Metallosupramolecular Polymers *Haruki Wada1, Masayoshi Higuchi2, Shuichi Maeda1 1. Tokai University (Japan), 2. NIMS (Japan) |
| The device used in this study is made of a metallosupramolecular polymer with electrochromic properties, which changes color when electricity is passed through it. In a reduced state, it appears purple, but when electricity is passed through it, it oxidizes and becomes transparent. Furthermore, when the electrodes are removed, a reaction occurs that returns it to a reduced state. | |
| EPp1-4L | Imaging Colorimeter Based Analysis of Luminance and Contrast Stability in Color Epaper Kaleido 3 and Kaleido Plus *Jia-Hui Chen1, Pei-Yu Chu1, Zi-Yan Zhan2, Yi-Zhen Yu1, Ting-Zhen Chu1, Hsin-Liang Lin1, Wei-Tse Pai3, Frank Huang4, Hung-Pin Hsu2, Kazuto Nishikawa5, Cheng-Wei Wang6, JM Hung7, Junichi Takeya8, Yi-Ping Wang1,6 1. National Taiwan University of Science and Technology (Taiwan), 2. Ming Chi University of Technology (Taiwan), 3. Da-Yeh University (Taiwan), 4. Taiwan Denkei solution Corporation (Taiwan), 5. TechnoOptis Corporation (Japan), 6. Industrial Technology Research Institute (Taiwan), 7. E Ink Holdings Incorporated (Taiwan), 8. The University of Tokyo (Japan) |
| Using an imaging colorimeter, we evaluate E Ink Kaleido 3 and Kaleido Plus under frontlight on/off and ambient illuminance. Metrics include luminance, uniformity, and contrast ratio. Kaleido 3 ~11:1, ~90% uniformity near 10 cd/m2; Kaleido Plus ~10:1 with larger delta E. Results guide human factors frontlight settings for readable, efficient epaper. | |
| EPp1-5L | Reversible Transparent/Mirror/Black Modulation on a Single Electrode by Ag Deposition-based Electrochromic Device Using Organic Capping Agent *Kotaro Umetani1, Shun Uji1,2, Norihisa Kobayashi1, Kazuki Nakamura1 1. Chiba University (Japan), 2. Tokyo Polytechnic University (Japan) |
| We have achieved the coloration control of mirror and black states on smooth electrodes in silver deposition-based electrochromic devices by introducing 1,3-diamino-propane-N, N, N', N'-tetraacetic acid. In this study, the repetition stability of the device was significantly improved and enhanced the practicality of the coloration control by investigating the supporting electrolyte. |
Workshop on MEMS and Emerging Technologies for Future Displays and Devices
| Dec. 3 | 13:30-14:50 | Phoenix Hall | MEET1 | Novel Materials, Fundamental Components and Process Technologies |
| Dec. 3 | 15:20-16:40 | Phoenix Hall | MEET2 | Micro/Nanodisplays and Nanotechnology Applications (1) |
| Dec. 3 | 17:10-18:30 | Phoenix Hall | MEET3 | Micro/Nanodisplays and Nanotechnology Applications (2) |
| Dec. 4 | 9:00-10:20 | Phoenix Hall | MEET4 | Micro/Nanodisplays and Nanotechnology Applications (3) |
| Dec. 4 | 10:50-12:10 | Phoenix Hall | MEET5 | Micro/Nanodisplays and Nanotechnology Applications (4) |
| Dec. 4 | 14:10-15:30 | Phoenix Hall | MEET6 | EL Quantum Dots Technologies (1) |
| Dec. 5 | 9:00-10:20 | Phoenix Hall | MEET7 | EL Quantum Dots Technologies (2) |
| Dec. 5 | 10:50-12:10 | Phoenix Hall | MEET8 | Emerging Quantum Dots and Nanotechnologies (1) |
| Dec. 5 | 14:10-15:10 | Phoenix Hall | MEET9 | Emerging Quantum Dots and Nanotechnologies (2) |
| Dec. 5 | 16:00-17:00 | Phoenix Hall | MEET10 | Emerging Quantum Dots and Nanotechnologies (3) |
| Dec. 4 | 16:20-17:40 | Conference Management Room | MEETp1 | Emerging Quantum Dots and Their Novel Materials/Components/Process Technologies |
| Dec. 4 | 16:20-17:40 | Conference Management Room | MEETp2 | Micro/Nanodisplays and Their Novel Materials/Components/Process Technologies |
MEET1: Novel Materials, Fundamental Components and Process Technologies
Dec. 3 13:30-14:50 Phoenix Hall
Chair: Ioannis Kymissis (Columbia University)
Co-Chair: Chien-Chung Lin (National Taiwan University)
| MEET1-1
13:30 |
Invited Development and Progress of Field Sequential Color Display Jia-Hong Wang1, *Yang En Wu1, Jenn-Jia Su1, Ya-Ling Hsu1, Yueh-Hung Chung1 1. AUO Corporation (Taiwan) |
| Several research studies have been conducted, and the world's first large-sized, ultra-high-resolution, high-refresh-rate FSC display has been published. AUO has successfully developed a 65“ 8K 360Hz FSC display with a low CBU effect and power savings of up to 30%. AUO has made significant progress in FSC technology and continues to work on optimizing algorithms to achieve high color saturation, low CBU, and low power consumption ... | |
| MEET1-2
13:50 |
Invited Anisometric Carbon Nanodots for UV-Visible Photoluminescent Shutters and Sensors *MinSu Kim1, Mangesh Patekari1, Archana Ramadas1, Seung Hee Lee1 1. Jeonbuk National University (Korea) |
| We demonstrate anisometric carbon nanodots uniformly aligned within polymer-network liquid crystals, enabling dynamic films with UV-visible modulation, polarized photoluminescence, and fast electro-optic switching. Their voltage- and UV-responsive emission behavior offers multifunctionality for smart windows, UV sensors, and adaptive photonic systems, advancing tunable hybrid materials for next-generation optoelectronic applications. | |
| MEET1-3
14:10 |
Invited Enhanced Extreme Ultraviolet (EUV) Light Source Using Cold Electron Beam (C-beam) Irradiation for High-Precision EUV Pellicle Inspection Umesh Apugade1, Iksu Kim1, *Kyu Chang Park1 1. Kyung Hee University (Korea) |
| Here, we demonstrate a high-performance EUV source using optimized cold electron beam (C-beam) irradiation with tailored EUV collimation. The system achieved uniform pellicle transmittance with <1% repeatability. These results highlight the potential of C-beam EUV sources for precise, reliable EUV pellicle inspection, highlighting the potential of C-beam-based EUV sources for next-generation actinic metrology applications. | |
| MEET1-4
14:30 |
Polymer Removal and Scallops Smoothing Optimized Chemistry in MEMS Process Fabrication and Other Applications within a High-Density Radical Flux Remote Plasma Yumi Kawamura2, *Marc Segers1, Michio Tanimura2, Saphia Benkoula1, Hirokuni Shibata2, Thierry Lazerand1 1. Plasma-Therm Europe (France), 2. Plasma-Therm-Japan K.K. (Japan) |
| Micro-Electromechanical Systems (MEMS) device productions need deep etching process and / or sacrificial photoresist removal. The removal process is often using chemical etching. With our High-Density Radical Flux (HDRF) source design, we generate oxygen radicals for a highly selective etching process required to successfully remove the polymer without damaging other microstructures. |
MEET2: Micro/Nanodisplays and Nanotechnology Applications (1)
Special Topic of Interest on Micro/Mini LEDs
Dec. 3 15:20-16:40 Phoenix Hall
Chair: Kyu Chang Park (Kyung Hee University)
Co-Chair: Yang-En Wu (National Yang-Ming Chiao-Tung University)
| MEET2-1
15:20 |
Invited Use of MicroLEDs as a Light Source in Advanced Microscopy *Ioannis Kymissis1 1. Columbia University (United States of America) |
| MicroLED devices offer the potential for high speed, high resolution, and high intensity display devices. These same characteristics can also be applied to alternative areas. In this presentation, we will present some of our recent work using microLED devices as the light engines for microscopes, unlocking a number of super-resolution micrography modalities and image mapping for a range of applications. | |
| MEET2-2
15:40 |
Invited Technological Paths Towards Directive MicroLEDs for ARVR and Optical Communication Applications: a Link to the Integration Scheme to CMOS *Julia Simon1, Jérémie Lechenault, Quentin Abadie1, Nicolas Michit1, Aurélien Lardeau-Falcy1, Florian Dupont1, Kevin Guy1, Nicolas Massoni1, Jean-Marie Quemper1, Romain Laurent1, Marion Douma1, Simon Ruel1, Fabian Rol1, Stéphane Altazin1, Patrick Le Maitre1, Paolo De Martino1 1. University Grenoble Alpes, CEA LETI (France) |
| FDTD design optimization of a 2µm µLED will be reported, studying levers such as pixel slope angle, µlens addition or optical cavity tuning on Light Extraction Efficiency and directivity. Recent experimental proof of concept of a <10µm LEDs will be shown, allowing a preliminary comparison of the different optical solutions. | |
| MEET2-3
16:00 |
Invited Optical and Electrical Characteristics of Heterogeneously Integrated Blue microLEDs for High-Resolution Displays *Pranav Gavirneni1, William S. Wong1,2 1. University of Waterloo (Canada), 2. Waterloo Institute for Nanotechnology (Canada) |
| InGaN uLEDs with 6µm diameters were fabricated using dry etching and polymer passivation. The devices showed negligible sidewall degradation with surface-recombination velocities ~400 cm/s, and 17% wall-plug efficiencies. A simple model was used to identify LED size limits, enabling a scalable design and fabrication approach for uLEDs used in high-resolution displays. | |
| MEET2-4
16:20 |
Invited Ink-Jet Printed QDCC in MicroLED: Status and Main Challenges *Igor Nakonechnyi1, Alasdair Brown1, Valeriia Grigel1, Mohammad Kiaee1 1. QustomDot BV (Belgium) |
| This paper discusses the current status and key challenges of ink-jet printed quantum dot color conversion for microLED applications. QustomDot highlights the commercial readiness of its industrial ink-jet inks, now available for microLED integrations. Significant progress has been demonstrated in critical areas including printability, ink shelf life, conversion efficiency, and reliability. |
MEET3: Micro/Nanodisplays and Nanotechnology Applications (2)
Special Topic of Interest on Micro/Mini LEDs
Dec. 3 17:10-18:30 Phoenix Hall
Chair: Julia Simon (CEA-LETI)
Co-Chair: MinSu Kim (Jeonbuk National University)
| MEET3-1
17:10 |
Invited MicroLED as an Enabler for Human-Machine Interfaces in the Age of AI *Reza Chaji1 1. VueReal Inc. (Canada) |
| MicroLED displays are key to next-gen AI systems, offering high brightness, transparency, and real-time adaptability for advanced HMIs. This paper explores their role in autonomy, AR, and intelligent design. VueReal’s platform addresses manufacturing challenges to enable scalable, high-performance microdisplay solutions. | |
| MEET3-2
17:30 |
Invited Advanced Processing for Display Devices - Towards Making AI/AR a Reality *Andrew Newton1, Sean Cho1, Zhengfei Wei1, Paulo Lima1, David Pearson1 1. Oxford Instruments Plasma Technology (UK) |
| Advanced Processing for Display Devices - Towards Making AI/AR a Reality OIPT here presents recent work showing etching processes optimised to produce LEDs with minimised damage, as shown by luminescence data, as well as advances in producing for diffractive waveguides in a variety of materials and geometries | |
| MEET3-3
17:50 |
Invited A Sub-Micron InGaN LED Technology for RGB Displays *Mikael Björk1, Magnus Heurlin Heurlin1, Martin Berg1, Ibrahim Yilmaz1, Zhaoxia Bi1, Lars Samuelson1 1. Hexagem AB (Sweden) |
| . | |
| MEET3-4
18:10 |
Invited High Pixel Density Technology for Colloidal Quantum Dot Based Color Conversion Arrays *Chien-Chung Lin1,2, Ting-Jhih Kuo1, Chien-Yu Lu1 1. National Taiwan University (Taiwan), 2. Industrial Technology Research Institute (Taiwan) |
| In this talk, we will demonstrate our latest works related to a colloidal-quantum-dot based color conversion layer which can deliver a full-color density higher than 5000 pixel-per-inch. The high color conversion efficiency can also be reached as high as 51.8%. |
MEET4: Micro/Nanodisplays and Nanotechnology Applications (3)
Special Topic of Interest on Micro/Mini LEDs
Dec. 4 9:00-10:20 Phoenix Hall
Chair: Jan Niehaus (Fraunhofer IAP)
Co-Chair: Kyu Chang Park (Kyung Hee University)
| MEET4-1
9:00 |
Invited GaN-on-Si Single-Chip Full-Color Micro-LED Display *Qian Sun1 1. Chinese Academy of Sciences (China) |
| This paper presents GaN-on-Si full-color micro-LED technology, a groundbreaking innovation that integrates red, green, and blue (RGB) sub-pixels on a single chip, enabling small and micro-pitch large-screen displays. By eliminating the need for complex mass transfer and repair processes and leveraging wafer-level packaging, this technology dramatically improves the production line yield, reduces costs, and enhances display performance. | |
| MEET4-2
9:20 |
Invited Sequential Assembly of Micro-LEDs Utilizing Simultaneous Transfer and Bonding (SITRAB) Method *Jungho Shin1, Jiho Joo1, Gwang-Mun Choi1, Chanmi Lee1, Ki-seok Jang1, Jin-hyuk Oh1, Ga-Eun Lee1, Seong-Cheol Kim1, Yong-Sung Eom1, Kwang-Seong Choi1 1. Electronics and Telecommunications Research Institute (Korea) |
| Herein, we report the sequential assembly of Micro-LEDs through simultaneous transfer and bonding (SITRAB) method for Micro-LED display applications. By successive SITRAB process, AlGaInP Micro-LEDs originated from different interposers were sequentially integrated with the same display substrates without distinct borderlines, and stably emitted light, both of which indicate the applicability of SITRAB method to realize a large-scale Micro-LED display. | |
| MEET4-3
9:40 |
Invited Revolutionizing Light Control: The Fastest Electrochromic Switch on a 17.3“ Transparent Micro-LED Display *Yang En Wu1,2, Chin An Lin2, Jen Hao Shih2, Yu Tang Tsai2, Kun Cheng Tien2, Chun Lung Huang2, Liang Yin Huang2, Li Yin Chen1, Hao Chung Kuo1 1. National Yang Ming Chiao Tung University (Taiwan), 2. AUO Corporation (Taiwan) |
| In this study, we developed a 17.3“ EC light switch offering high transmittance, minimal diffraction, and rapid response time. The Ton / Toff of the EC cell is 2.3s and 10.21s. After integration with a 17.3“ micro-LED module, the resulting transmittance in the transparent state is 47.6%, with no visible moiré patterns. | |
| MEET4-4
10:00 |
Micro LED Slurry for Large Carrier Substrate *In-Cha Hsieh1, Steve Lin2 1. Winka Technologies Ltd. (Taiwan), 2. Lens Tec. Corp. (China) |
| To achieve high density MicroLED slurry in fluidic self-assembly process, Hundreds of millions of micro/nano LED dissolve in solution. Water is the best medium to accommodate micro/nano scale LEDs to form slurry. High volume of Micro LEDs with negative zeta potential disperses with water. |
MEET5: Micro/Nanodisplays and Nanotechnology Applications (4)
Special Topic of Interest on Micro/Mini LEDs
Dec. 4 10:50-12:10 Phoenix Hall
Chair: Yang-En Wu (National Yang-Ming Chiao-Tung University)
Co-Chair: Julia Simon (CEA-LETI)
| MEET5-1
10:50 |
Invited Photolithographic Fabrication of High-Resolution Micro-QLED Towards Color-Conversion Microdisplay *Junhua Kuang1, Yuyu Jing1, Mingyu Yao1, Haizheng Zhong1 1. Beijing Institute of Technology (China) |
| Aiming to achieve high-resolution and full-color microdisplay, we report the photolithographic fabrication of color-converted Micro-quantum dot light emitting diodes (QLED) panel by combining blue Micro-QLED electroluminescence (EL) device and red-green quantum dot color converter (QDCC). The photolithographic fabrication of color-converted Micro-QLED provides an easy-operated method for achieving cost-effective microdisplay panels. | |
| MEET5-2
11:10 |
Invited Enhanced Extreme Ultraviolet (EUV) Light Source Using Cold Electron Beam (C-beam) Irradiation for High-Precision EUV Pellicle Inspection *Noam Shapiro1, Tali Hurvitz1 1. InZiv (Israel) |
| This study compares electroluminescence (EL) testing across two key microLED fabrication approaches: monolithic integration and mass transfer. A high-throughput, non-destructive EL technology for wafer-level testing is presented, offering superior insight into device performance and enabling optimized testing strategies for scalable, high-yield microLED manufacturing. | |
| MEET5-3
11:30 |
Impact of Crystal Quality of Ud-GaN Layer on Red Light Emission Efficiency of Eu,O-Codoped GaN-LED *Katsuji Iguchi1, Hidenori Kawanishi1, Norio Kanzaki1, Kazutsune Miyanaga1, Takeo Ogura1, Yasufumi Fujiwara1 1. Ritsumeikan University (Japan) |
| The effect of crystal quality of the ud-GaN layer on the light intensity of the LED with GaN:Eu light emitting layer grown on the ud-GaN layer has been investigated. We consider that the increase of the light intensity is due to the increase of the density of europium ions contributing to light emissions. | |
| MEET5-4L
11:50 |
Dual-Color Micro-LED Transmitter with MEMS Mirror Steering for Compact VLC *Shih-Yi Yeh1, Zhi-Xuan Liao1, Cheng-Mu Tsai2, Chun-Wei Tsai1 1. National United University (Taiwan), 2. National Chung Hsing University (Taiwan) |
| We implemented Micro-LED with independently driven blue and green emissions, enabling stable dual-color output in a single structure. With a microlens and MEMS mirror, the divergence angle was reduced from 128.7° to 35.43°. The compact integrated device was evaluated in a VLC system, showing a strong 8 MHz response within 0 - 10 MHz. |
MEET6: EL Quantum Dots Technologies (1)
Special Topic of Interest on Quantum Dot Technologies
Dec. 4 14:10-15:30 Phoenix Hall
Chair: Hsueh-Shih Chen (National Tsing Hua University)
Co-Chair: Zingway Pei (National Chung Hsing University)
| MEET6-1
14:10 |
Invited Active-Matrix NIR Sensor *Jin Jang1, MD Redowan Mahmud Arnob1, Hansol Jeong1 1. Kyung Hee University (Korea) |
| We review the results on near infrared sensors based on organic semiconductors and quantum dot PbS. It is of increasing interest on low-cost materials such as organic semiconductors and QD with low band gaps. The photo-response of an organic bulk-heterojunction (BHJ) device has been developed. The BHJ photoconductors on polyimide substrate show excellent flexibility. The PbS QD on IGZO TFT surface can be used for ... | |
| MEET6-2
14:30 |
Invited Quantum Dots for Next-Gen Displays - Addressing the Needs of LED, OLED, µLED & QLED *Jan Steffen Niehaus1, Sören M Becker1, Tobias Jochum1, Sonja Zeller1 1. Fraunhofer IAP (Germany) |
| Quantum Dots (QDs) are transforming the display industry by enabling unparalleled color performance and energy efficiency. However, diverse architectures like LED, OLED, µLED, and QLED impose unique demands on QD properties. We will show the impact of different QD architectures on their properties and discuss the best fit to the different displays. | |
| MEET6-3
14:50 |
Invited Device and Material Tactics for Efficient Quantum Rod Light Emitting Diodes *Abhishek Kumar Srivastava1 1. The Hong Kong University of Science and Technology (Hong Kong) |
| This talk will cover challenges for Quantum Rod LEDs (QRLEDs) such as packing density, leakage current, and device engineering. We will present innovative device structures that achieve record-high external quantum efficiencies of 32% for red, 24% for green, and 9% for blue QRLEDs. | |
| MEET6-4
15:10 |
Invited Realization of Quantum Dot Full-Color Display by Direct Photolithography *Hanbing Zhang1, Jiaming Wang1, Yang Gao1, Xiaoyuan Zhang1, Shaoyong Lu1, Qing Dai1, Dong Li1, Zhuo Chen1, Yanzhao Li1 1. BOE Technology Group Co., Ltd. (China) |
| Quantum dot display technology is currently a popular research direction. We have achieved full-color registration of quantum dots using standard photolithography processes, including film coating, exposure, and development. Finally we successfully fabricated a 7.9-inch 560-ppi full-color AMQLED prototype. |
MEET7: EL Quantum Dots Technologies (2)
Special Topic of Interest on Quantum Dot Technologies
Dec. 5 9:00-10:20 Phoenix Hall
Chair: Heesun Yang (Hongik University)
Co-Chair: Igor Nakonechnyi (QustomDot BV)
| MEET7-1
9:00 |
Invited Color Conversion Film Performances of Fluorescent Organic Nanodots for LCD Applications *Jang Hyuk Kwon1, Rasheeda Ansari1, Yohan Ahn1 1. Kyung Hee University (Korea) |
| Organic nanodots (ONDs) are advanced materials for high performance optical films in LCDs. Synthesized from organic fluorophores, ONDs are dispersed in a transparent polymer matrix to form flexible CCFs. These films show over 80% BT.2020 color gamut and over 400 nit brightness under a 2000 nit blue LED, due to their narrowband emission and high absorption. | |
| MEET7-2
9:20 |
Invited Toward High-Performance Top-Emitting Quantum Dot Light-Emitting Diodes *Jeonghun Kwak1, Minjun Kim1 1. Seoul National University (Korea) |
| High-performance top-emitting quantum dot light-emitting diodes were achieved with a maximum external quantum efficiency of ~30%. The microcavity structure was optimized by precise tuning of electron and hole transport layer thicknesses through optical simulations. Enhanced Purcell effect further improved efficiency, enabling promising applications in displays. | |
| MEET7-3
9:40 |
Invited Improving the Efficiency of Organic Light-Emitting Diodes by Charge Generation in Embedded Quantum Dots *Zingway Pei1, Ching Chao1, Ching Yu Hsu2 1. National Chung Hsing University (Taiwan), 2. National Yang Ming Chiao Tung University (Taiwan) |
| We demonstrate external quantum efficiency enhancement in OLEDs by incorporating quantum dots. Silicon quantum dots act as charge-generation centers in blue devices, boosting EQE ninefold. Even applied to green and red-emission materials, EQE yields over 100 % improvement. These strategies offer scalable, low-complexity routes for high-performance OLEDs. | |
| MEET7-4
10:00 |
Invited Development of Colloidal CuInSe2 Quantum Dots for Photodetection and Up-Conversion *Hsueh-Shih Chen1, Yu-Sian Lin1 1. National Tsing Hua University (Taiwan) |
| Lead-free CuInSe2 (CISe) quantum dots (QDs) with tunable emission (789-1390 nm) were synthesized via hot injection. CISe photodetectors achieved responsivity of 5.3 A/W and detectivity of 5.6×1012 Jones at 950 nm. Integration with ZnCdSeS QDs further enabled efficient infrared-to-visible up-conversion. |
MEET8: Emerging Quantum Dots and Nanotechnologies (1)
Special Topic of Interest on Quantum Dot Technologies
Dec. 5 10:50-12:10 Phoenix Hall
Chair: JangHyuk Kwon (Kyung Hee University)
Co-Chair: Hsueh-Shih Chen (National Tsing Hua University)
| MEET8-1
10:50 |
Invited Engineering Perovskite Quantum Dot-Polymer Composites for Advanced Scintillator Applications *Shruti Jayaprakash Saiji1, Luis Stand2, Yauhen Tratsiak2, Carlos Flores1, Joshua Fnu1, Lei Zhai1, Andre J. Gesquiere1, Shin Tson-Wu1, Yajie Dong1 1. University of Central Florida (United States of America), 2. University of Tennessee (United States of America) |
| We fabricate color-tunable and thermally robust, high performance scintillating fibers by embedding perovskite quantum dots into polyethylene terephthalate (PET) fibers via an optimized deep-dyeing method. The fibers show high light yield and robust thermal stability with full recovery after cycling, highlighting their potential for scintillator applications in harsh environments. | |
| MEET8-2
11:10 |
Invited Miniaturization of Perovskite and Organic Light-Emitting Diodes using Molecular-Beam Holographic Lithography *Chih-Jen Shih1 1. ETH Zurich (Switzerland) |
| Here I present our recent progress on nanopatterning of organic and perovskite semiconductors using nanostencil and molecular-beam holographic lithography. The new techniques allow us to scalably fabricate nanopatterned perovskite and organic emitters with critical dimensions down to 100 nanometers. We demonstrated miniaturized LED pixels with the highest array densities up to 100,000 (single-color) and 10,000 (RGB) ppi. | |
| MEET8-3
11:30 |
Invited Matrix and Surface Engineering Strategies to Maximize Optical Properties of Perovskites and Quantum Dots Yujin Choi1, Byeong-Hyeon Yoo1, Jeong Bin Park1, Sundararajan Parani1, Zhang Yi1, *Jang-Kun Song1 1. Sungkyunkwan University (Korea) |
| We demonstrate significant photoluminescence (PL) enhancement and stability improvements in CsPbBr3 quantum dot (QD) and perovskite films by combining microporous engineering through CO2 foaming and synergetic ligand removal-surface repair-encapsulation treatments. The integration provides pathways for highly efficient, robust, and process-flexible display materials. | |
| MEET8-4
11:50 |
Face-Down-Oriented Perovskite Nanoplatelets for Pure-Blue Light-Emitting Diodes *Naoaki Oshita1, Mao Goto1, Satoshi Asakura2, Motofumi Kashiwagi3, Akito Masuhara1,4 1. Yamagata University (Japan), 2. ISE Chemicals Corporation (Japan), 3. Zeon Corporation (Japan), 4. Frontier Center for Organic Materials (Japan) |
| Pure-blue perovskite nanoplatelets (PeNPLs) exhibit anisotropy and polarized transition dipole moments, making them suitable for light-emitting diodes (LEDs). In this study, we investigated the effect of lateral size on their orientation order and optical properties. Large-lateral PeNPLs demonstrated high face-down orientation order and optical properties, resulting in enhanced LED performance. |
MEET9: Emerging Quantum Dots and Nanotechnologies (2)
Special Topic of Interest on Quantum Dot Technologies
Dec. 5 14:10-15:10 Phoenix Hall
Chair: Jeonghun Kwak (Seoul National University)
Co-Chair: Chih-Jen Shih (ETH Zurich)
| MEET9-1
14:10 |
Invited Competitive Alternatives to InP Quantum Dots: ZnSeTe and (Ag,Cu)-Based I-III-VI Emitters *Heesun Yang1, Yuri Kim1, Yang-Hee Kim1, Seunghyeok Ryu1, Seoyon Kim1, Sinwon Choi1, Changhoon Lee1, Beomgyu Kim1, Zeeshan Latif1 1. Hongik University (Korea) |
| As alternatives to InP quantum dots (QDs), green-emissive ZnSeTe and red-emissive Ag-In-Ga-Se-S and Cu-In-Ga-S QDs are synthesized and utilized for the fabrication of high-performance electroluminescence and color conversion light-emitting diodes, respectively. | |
| MEET9-2
14:30 |
Invited Enabling High-Resolution QD-OLED Displays Through Patternable Quantum Dot Photoresist Technology *Hyunsu Cho1, Chan-mo Kang1, Sukyung Choi1, Jin-Wook Shin1, Byoung-Hwa Kwon1, Gi Heon Kim1, Jong-Heon Yang1, Jaedong Jang2, Hee-Tae Jung2, Jin Sun Kim3, Jong Ho Jeong3, Jeong Ah Kim3, Hyoc-Min Youn3 1. Electronics and Telecommunications Research Institute (ETRI) (Korea), 2. Korea Advanced Institute of Science and Technology (KAIST) (Korea), 3. Dongjin Semichem Co. (Korea) |
| We demonstrate a high-resolution quantum dot(QD)- organic light-emitting diode(OLED) display architecture using patternable QD photoresist with reflective sidewalls. The proposed fabrication process enables precise pixel definition, suppresses optical crosstalk, and improves color conversion efficiency. Our results show that this approach offers a scalable route toward next-generation QD-OLED displays with high resolution. | |
| MEET9-3
14:50 |
Invited Surface Reconstruction of Quantum Dot and Its Active-Matrix Display Application Xingliang Dai1, *Zichao Ma1, Zhizhen Ye1 1. Zhejiang University (China) |
| The research focuses on active-matrix quantum dot display chips and has achieved breakthroughs in LED luminous efficacy, lifetime, and response time as well as in integrated display with TFT. To solve the challenge of controlling surface defects, we constructed a core-shell structure for metal-halide quantum dots, designed inert conjugated ligands, and reconstructed the nanosurface through etching, achieving records in LED luminous efficacy and lifetime. |
MEET10: Emerging Quantum Dots and Nanotechnologies (3)
Special Topic of Interest on Quantum Dot Technologies
Dec. 5 16:00-17:00 Phoenix Hall
Chair: Jang-Kun Song (Sungkyunkwan University)
Co-Chair: Jeonghun Kwak (Seoul National University)
| MEET10-1
16:00 |
Invited Recent Research and Development of Quantum Dot Color Conversion OLED Displays *Wenfeng Song1, Rong Zhang1, Enqing Guo1, Lei Mi1, Cuili Gai1, Weiqi Xu1, Rubo Xing1, Xiujian Zhu1 1. Visionox Technology Inc. (China) |
| The complicated process flow and low light extraction efficiency of QD-OLED restrict its application in high-resolution displays. 1) QD photolithographed directly on Encapsulation, 2) Tandem Blue-OLED excitation light source, 3) low-refractive-matching material and 4) optical-selective filters are utilized to solve these problems. It is beneficial to the resolution improvement from current 160 PPI to about 300 PPI. | |
| MEET10-2
16:20 |
Invited Heavy Metals Free, Blue Light Emitting Quantum Dots for Color Conversion and for Emissive Displays Application *Artur Podhorodecki1, Monika Czarnecka1, Aleksandra Kropidłowska Strzelczyk1, Barbara Banasiuk1, Marta Szymanska1, Maciej Ziemba1, Mateusz Banski1 1. QNA Technology S.A. (Poland) |
| UV-curable ink composition comprising functionalized blue-emitting quantum dots was invented. The ink composition demonstrates excellent stability over time and unique optical properties (QY > 70%). UV-curable ink could be printed by inkjet printing and used as a light-emitting device. | |
| MEET10-3
16:40 |
Outstanding Enhancement of the Photostability of PeNC-Based QDEF via Lecithin Surface Passivation *Takuro Iizuka1, Yusaku Morikawa1, Taisei Kimura1, Rinku Watanabe1, Satoshi Asakura2, Motofumi Kashiwagi3, Akito Masuhara1,4 1. Yamagata University (Japan), 2. ISE Chemicals Corporation (Japan), 3. Zeon Corporation (Japan), 4. Frontier Center for Orgamic Materials (Japan) |
| The poor photostability of perovskite nanocrystals (PeNCs) in polymer film was significantly improved by introducing lecithin, a zwitterionic ligand. Under accelerated photo-irradiation test, the lecithin-modified PeNCs polymer film exhibited a photoluminescence half-life of 100 hours, 100 times longer than that of unmodified samples, indicating strong potential for display applications. |
MEETp1: Emerging Quantum Dots and Their Novel Materials/Components/Process Technologies
Special Topic of Interest on Quantum Dot Technologies
Dec. 4 16:20-17:40 Conference Management Room
| MEETp1-1 | Stability Enhancement of Blue and Green ZnSeTe Quantum Dot-Light-Emitting Diodes Enabled by Al Incorporation *Yang-Hee Kim1, Sinwon Choi1, Seoyon Kim1, Changhoon Lee1, Sunghyun Park1, Heesun Yang1 1. Hongik University (Korea) |
| ZnSeTe quantum dots (QDs) are promising electroluminescent materials for blue and green QD-light-emitting diodes (QLEDs). Here, we enhance efficiency and stability by incorporating aluminum (Al) into ZnS outer shell. Optimized green QLEDs achieved an external quantum efficiency (EQE) of 19.6% and a half-lifetime of 166.5 h at 6000 cd/m2, while blue devices showed 13.1% EQE and 13.4 h lifetime at 4000 cd/m2. | |
| MEETp1-2 | Ag-Based I-III-VI Quantum Dots as Efficient, Absorption-Enhanced Green and Red Emitters *Yuri Kim1, Seunghyeok Ryu1, Seong Min Park1, Beomgyu Kim1, Donghyeok Shin1, Zeeshan Latif1, Heesun Yang1 1. Hongik University (Korea) |
| Green Ag-In-Ga-S (AIGS) and red Ag-In-Ga-Se-S (AIGSeS) quantum dots (QDs) were synthesized with controlled compositions, exhibiting enhanced absorption and high photoluminescence (PL) efficiency. GaSx shelling improved PL quantum yield (PL QY) to 95% for AIGS and 82% for AIGSeS. Polymeric green and red QD composite films showed light conversion efficacies of 24.5% and 48.2%, respectively, confirming their potential for color conversion applications. | |
| MEETp1-3 | Solvent-Tuned Plasticity of a New Lead-Free Halide for Binder-Free Integration into Emissive Optoelectronic Systems *Ji Hyeon Cha1, Joo Hyeong Han1, Won Bin Im1 1. Hanyang University (Korea) |
| Binder-based color conversion layers suffer from optical losses, stability issues, and increased thickness. Herein, cyclopropyltriphenylphosphonium manganese tetrabromide (CPTP2MnBr4), a novel lead-free metal halide, enables binder-free applications via solvent-tuned plasticity. The material is applicable to luminescent clays, direct ink writing, pattern printing, WLEDs, and scintillators. |
MEETp2: Micro/Nanodisplays and Their Novel Materials/Components/Process Technologies
Dec. 4 16:20-17:40 Conference Management Room
| MEETp2-1 | High-Performance poly-IGO TFTs by Fluorine Doping for OLED Display *Sangchul Choi1, Myeonggi Jeong1, Jin Jang1 1. Kyung Hee University (Korea) |
| We fabricated fluorine-doped indium gallium oxide (IGO:F) thin film transistors (TFTs) via spray pyrolysis. The device with optimized fluorine doping exhibited superior performance, achieving a field effect mobility of 48.02 cm2/V·s with excellent stability. These results indicate that optimal fluorine doping in IGO can improve device performance, making it a promising candidate for OLED backplane TFT applications. | |
| MEETp2-2 | Ferroelectric Behavior of Al-Doped HfO2 with IGZO Interface under 450°C Processing for Non-Volatile Memory Devices *Gahong Lee1, Junsin Yi1 1. Sunkyunkwan University (Korea) |
| We report Al-doped HfO2 ferroelectric memory devices with an IGZO capping layer, fabricated at 450°C. Optimized 3.2% Al doping enhances ferroelectric performance, yielding high remnant polarization (2Pr = 18.3 uC/cm2) and >10^8 cycles endurance. The IGZO layer improves retention and reduces imprint, offering a scalable solution for low-power, high-density memory in IoT and AI. | |
| MEETp2-3 | Energy Analysis of Field Emission Electron Sources using Liquid Metal *Hiroki Sato1, Yoichiro Neo1, Jonghyun Moon1 1. Shizuoka University (Japan) |
| Energy analysis was performed on conventional W-tips and W-tips coated with gallium (Ga/W-tips). Both tips showed an increase in energy width along with current flow because of heat and electric fields. The Ga/W-tip showed a wider distribution on the low-energy side despite a lower applied voltage than the W-tip. | |
| MEETp2-4 | Development of a Sensor Display Simulation Model for Mealtime Assistance and a Spoon Navigation Application Hirokazu Kawana1, Masumi Muramatsu2, *Atsushi Mitani2 1. Gekitetz Inc., Digital Hollywood University, graduate school (Japan), 2. Sapporo City University (Japan) |
| Meal assistance is vital for elderly individuals with oral difficulties. This study presents a third simulation model with LED sensors on the tongue and lip, enhancing previous models. It aims to support the education of nursing students and caregivers by enabling practice and evaluation of spoon techniques. | |
| MEETp2-5 | Analysis of Leakage-Induced Efficiency Loss in Parallel Nanorod LEDs *Kyeonghoon Yeom1,2, Gang Yeol Yoo1, Won Il Park2, Hyun Min Cho1 1. Korea Electronics Technology Institute (Korea), 2. Hanyang University (Korea) |
| This study demonstrates the electrical and optical characteristics of electroluminescence (EL) devices using nanorod light-emitting diodes (LEDs) assembled via dielectrophoresis. The impact of leakage current on luminance and efficiency is analyzed through single and parallel nanorod LEDs, as well as reconstructed combination of single LEDs, providing insight into current distribution and emission behavior in pixel composed of parallel nanorod LEDs. |
Workshop on Display Electronic Systems
| Dec. 4 | 9:00-9:40 | Dahlia 1 | DES1 | Human Interface Technologies for Automotive Display |
| Dec. 4 | 10:50-12:10 | Dahlia 1 | DES2 | Driving Technologies (1) |
| Dec. 4 | 14:10-15:10 | Cosmos 2 | DES3/3D5 | 3D Data Compression |
| Dec. 5 | 14:10-15:30 | Ran 1 | DES4 | Image Processing (1) |
| Dec. 5 | 11:10-12:30 | Conference Management Room | DESp1 | Driving Technologies (2) |
| Dec. 5 | 11:10-12:30 | Conference Management Room | DESp2 | Image Processing (2) |
DES1: Human Interface Technologies for Automotive Display
Special Topic of Interest on Automotive Displays
Dec. 4 9:00-9:40 Dahlia 1
Chair: Haruhiko Okumura (Kanagawa Institute of Technology)
Co-Chair: Chih-Wen Lu (National Cheng Kung University)
| DES1-1
9:00 |
Invited Visual Evaluation Experiment of Automated Driving System Marker Lamps *Michiaki Sekine1, Akihiro Abe1, Yoko Kato1, Yoshiro Aoki1 1. National Traffic Safety and Environment Laboratory (Japan) |
| International regulation of “automated driving system marker lamps” to indicate to surrounding road users that the vehicle is in automated driving mode is discussed. This paper reports the results of an indoor visual experiment in which a horizontal marker lamp was mounted on the front edge of the roof of a mock-up vehicle and lit with blue-green colored light to investigate its visibility, ... | |
| DES1-2
9:20 |
Invited Investigating the Alerting Effectiveness of Direction Indicator Road Projection on Cyclists *Yoko Kato1, Yoshiro Aoki1, Michiaki Sekine1, Masaru Sasaki2, Yukiko Kitazawa2, Yuki Sudo2 1. National Traffic Safety and Environment Laboratory (Japan), 2. Koito Manufacturing Co., Ltd. (Japan) |
| This study evaluated cyclist response times to vehicle direction indicators, both with and without road projection, when the cyclist was located on the left side of the vehicle. Findings showed that when cyclists were either in motion or unable to directly see the direction indicator lights, response times were shorter with road projection. This result suggests that road projection of vehicles may be effective in ... |
DES2: Driving Technologies (1)
Dec. 4 10:50-12:10 Dahlia 1
Chair: Chih-Wen Lu (National Cheng Kung University)
Co-Chair: Reiji Hattori (Kyushu University)
| DES2-1
10:50 |
Invited Current-Programming Method for OLED, µ-LED and AI-Chip *Reiji Hattori1 1. Kyushu University (Japan) |
| The technology of current-programming method for OLED driving, and its principles are reviewed. Furthermore, the application of this technology to µ-LED and analog AI-chip is discussed. The array of current-programming pixel circuits functions as a memory and operates as a multiply-accumulate operation circuit. | |
| DES2-2
11:10 |
Invited Advanced Pixel Circuit Compensation Methods for AMOLED *Jaemyung Lim1 1. Hanyang University (Korea) |
| This paper reviews compensation techniques for AMOLED pixel circuits. As pixel density increases and the required driving current decreases, conventional LTPS-based circuits encounter significant limitations, including threshold voltage variation, subthreshold slope variation, and leakage current. To address these challenges, recent compensation methods are introduced and discussed in this paper. | |
| DES2-3
11:30 |
A Low-Power Integrated Driver Circuit with Variable Emission Pulse Width Based on Depletion-Mode Oxide TFTs *Dongseok Kim1, Hyunwoo Kim1, Chaeyeon Park1, Heejae Kang1, Hojin Lee1 1. Soongsil University (Korea) |
| In this paper, a new integrated driver circuit using oxide thin-film transistors (TFTs) is proposed. By utilizing a dynamic inverter and a series-connected two-transistor (STT) structure, the proposed circuit compensates for the depletion mode of oxide TFTs and generates multiple signals for display pixel circuits. Therefore, the proposed circuit is suitable for reducing power consumption and bezel size. | |
| DES2-4L
11:50 |
Low-Power Triple-Output Emission Control Driver Using Oxide Thin-Film Transistors *Sang-Hoon Kim1, Won-Been Jeong1, Jun-Seo Choi1, Kyung-Hoon Chung2, Byung-Chang Yu2, Seung-Woo Lee1 1. Kyung Hee University (Korea), 2. Samsung Display co. Ltd. (Korea) |
| A low-power, triple-output emission control driver using oxide thin-film transistors. A novel node-sharing architecture enables programmable 2H-unit pulse-width modulation and supports internal compensation. This circuit achieves identical 2.2µs falling time across all three outputs and reduces power consumption by up to 89.6% compared to conventional single-output drivers. |
DES3/3D5: 3D Data Compression
Special Topic of Interest on Artificial Intelligence and Smart Society
Dec. 4 14:10-15:10 Cosmos 2
Chair: Motohiro Makiguchi (NTT)
Co-Chair: Toshiaki Fujii (Nagoya Univ.)
| DES3/3D5-1
14:10 |
Adaptive Sampling and CNN Based Compression of Point Cloud to Improve Human Recognition of Object Shape *Hideaki Kimata1 1. Kogakuin University (Japan) |
| The geometry of structures is scanned and stored as point clouds. We have previously shown that for simple structures, shape recognition can be improved by adaptive sampling. In this study we propose an improved sampling method and CNN based compression that can be applied to general scenes with structures. | |
| DES3/3D5-2
14:30 |
Complex Hologram Compression Using Factorized Prior *Makoto Sekiguchi1, Cung-Hsuan Huang2, Chau-Jern Cheng2, Fan Wang1, Tomoyoshi Ito1, Tomoyoshi Shimobaba1 1. Chiba University (Japan), 2. National Taiwan Normal University (Taiwan) |
| Recent advances in Computer-Generated Hologram (CGH) resolution have enhanced visual quality but greatly increased data size, limiting practical use. We propose an efficient compression method for digital holograms using deep learning, which achieves superior compression performance and comparative reconstruction quality compared to conventional image compression techniques. | |
| DES3/3D5-3L
14:50 |
Phase Retrieval for Compressing Full-complex Holograms *Satoshi Kozuka1, Chihiro Tsutake1, Keita Takahashi1, Toshiaki Fujii1 1. Nagoya University (Japan) |
| We propose a method for compressing full-complex holograms, where compressible holograms are obtained by solving a phase retrieval problem. |
DES4: Image Processing (1)
Dec. 5 14:10-15:30 Ran 1
Chair: Haruhiko Okumura (Kanagawa Institute of Technology)
Co-Chair: Yuji Oyamada (Tottori University)
| DES4-1
14:10 |
Application-Aware Optimization of VDC-M Compression Algorithm and Hardware Implementation *Yanyan Wang1, Juxian Wang2, Zhonghao Shen2, Xing Liu2, Xuebing Zhou1, Lin Cheng1, Qinghong Lai1, Jialian Wu1, Jangjin Nam1, Enwei Ni1 1. Suzhou ESWIN Computing Technology Co.,Ltd. (China), 2. Xi'an ESWIN Computing Technology Co.,Ltd. (China) |
| A scenario-aware optimization strategy is introduced for the VDC-M compression algorithm, aiming to reduce hardware complexity by simplifying prediction modes based on typical usage patterns. This approach is tailored for common display applications. Experimental results demonstrate a substantial reduction in gate count with negligible impact on image quality. | |
| DES4-2
14:30 |
The Improvement and Implementation of Lossless Compression in the OLED-DBI Algorithm *Bo Yang1, Lin Cheng2, Meng-Da Xu1, Jing Xu1, Xue-Bing Zhou2, Ching-Hong Lai2, Jia-Lia Wu2, JJ Nam2, En-Wei Ni2 1. Shenzhen ESWIN Computing Technology Co., Ltd (China), 2. Suzhou ESWIN Computing Technology Co., Ltd (China) |
| In this paper, a lossless compression implementation scheme applied in the OLED-DBI algorithm is proposed, which significantly reduces the RAM size of the accumulation data. By improving the principle of JPEG-LS and optimizing the hardware circuit, the RAM size is reduced by about 40%, and the final utilization rate of RAM is 1/8. | |
| DES4-3L
14:50 |
UGSM: Structure-Preserving Landscape Style Transfer via Guidance Maps *Hsiang-Yu Tsai1, Kuo-Jui Hu1, Chun-Kung Cheng1, Yu-Fang Chang1, Yi-Fang Yan1, You-An Zhou1 1. National Taiwan University of Science and Technology (Taiwan) |
| This paper proposes the U-Net Guided Stylization Model (UGSM), designed to preserve the structural integrity and fine details of a content image while incorporating a target style. The model adopts a two-stage training strategy combined with progressive multi-scale upsampling to achieve high-resolution style transfer. | |
| DES4-4L
15:10 |
Invited Printable Moderate-Dynamic-Range (MDR) Image Generation Employing High-Dynamic-Range (HDR) Image Capture Technology Aligned with Human Circadian Behavior *Sakuichi Ohtsuka1, Michihiro Hayashi1, Shoko Hira2, Saki Iwaida3 1. International College of Technology, Kanazawa (Japan), 2. Kagoshima University (Japan), 3. Kagoshima Tenmonkan Medical College (Japan) |
| In this study, we try to extend our hypothesis, Normalized Visual Percept (NVP), to twilight vision. The key idea of the confirmation process is to focus on observing reflective images in daytime. Comprehensive tests show that images with very compressed contrast ratios of approx. 30:1, preserve high naturalness far more than conventional SDR printed images. |
DESp1: Driving Technologies (2)
Dec. 5 11:10-12:30 Conference Management Room
| DESp1-1L | A 10-Bit RRDAC for AMOLED Source Drivers *Chih-Wen Lu1, Ping-Yeh Yin2 1. National Tsing Hua University (Taiwan), 2. Taiwan Semiconductor Research Institute (Taiwan) |
| This study proposes an RRDAC with adaptive binary-weighted global current compensation for AMOLED display source drivers. Compensation currents are injected directly into the nodes of the global resister string according to the display data for moderating the loading effect, thus consuming the least compensation current. This architecture does not require current sources in each output channel, resulting in area shrinkage of driver channels. |
DESp2: Image Processing (2)
Dec. 5 11:10-12:30 Conference Management Room
| DESp2-1L | Data Hiding in Images by Modulating Chroma Difference Between Adjacent Pixels *Yuto Yamaguchi1, Tomokazu Shiga1 1. The University of Electro-Communications (Japan) |
| A data hiding method utilizing the low spatial resolution of human visual system for color is proposed. Results show visual degradation is suppressed when the modulation level ΔC*uv is < 10. Decoding thresholds are determined by considering the encoding error due to quantization, which is consistently less than ±1. |
Workshop on Flexible Electronics
| Dec. 3 | 15:20-16:40 | Dahlia 2 | FLX1 | Flexible and Stretchable Sensors |
| Dec. 3 | 17:10-18:10 | Dahlia 2 | FLX2 | Flexible Organic Devices |
| Dec. 4 | 10:50-12:10 | Dahlia 2 | FLX3 | Flexible and Stretchable Optoelectronic Devices (1) |
| Dec. 4 | 14:10-15:10 | Dahlia 2 | FLX4 | Flexible and Stretchable Optoelectronic Devices (2) |
| Dec. 5 | 9:00-10:00 | Dahlia 2 | FLX5 | Advanced Technologies for Flexible and Stretchable Displays |
| Dec. 5 | 10:50-11:50 | Dahlia 2 | FLX6 | Advanced Processes and Materials for Flexible Devices (1) |
| Dec. 5 | 14:10-15:10 | Dahlia 2 | FLX7 | Advanced Processes and Materials for Flexible Devices (2) |
| Dec. 4 | 16:20-17:40 | Conference Management Room | FLXp1 | Devices and Materials for Flexible Electronics |
FLX1: Flexible and Stretchable Sensors
Dec. 3 15:20-16:40 Dahlia 2
Chair: Teppei Araki (The Institute of Scientific and Industrial Research, Osaka University)
Co-Chair: Manabu Ito (TOPPAN Holdings Inc.)
| FLX1-1
15:20 |
Invited Material, Device, and System for Smart Contact Lens Applications *Takeo Miyake1 1. Waseda University (Japan) |
| We have developed several prototypes of an ultrasensitive diagnostic smart contact lens with high sensitive biosensors and high efficient parity-time (PT) symmetric wireless transfer systems, a wireless electrochromic lens using conductive polymer-based film, and multi-electrode electroretinogram (ERG) lens system. | |
| FLX1-2
15:40 |
Invited Structural Development of High-Resolution Stretchable Strain Sensor using LTPS-TFT Takumi Sano1, Yosuke Hyodo1, Masatomo Hishinuma1, Fumihoru Nakano1, Toshinori Uehara1, Kazuhide Mochizuki1, Tsutomu Harada1, Gen Koide1, *Shinichiro Oka1 1. Japan Display Inc. (Japan) |
| In recent years, with the advancement of wearable devices and IoT, interest in stretchable electronics that combine flexibility and elasticity has been growing. In response to this background, we developed an active-matrix type stretchable strain sensor using LTPS-TFT. This sensor can detect strain changes at 500 points in-plane in real time and can stretch up to 30%. This technology is expected to be applied in the medical, ... | |
| FLX1-3
16:00 |
Invited Tomographic Sensing for Advanced Human Interfaces *Shunsuke Yoshimoto1 1. The University of Osaka (Japan) |
| Tomographic sensing is an innovative imaging technique that leverages artificial intelligence and electromagnetic simulation to overcome the mechanical limitations of devices. Taking advantage of the tomographic sensing, the author has developed a tactile sensor, a wearable motion capture, and a multimodal imaging system. In this talk, the author explains the fundamentals of tomographic sensing and introduces its applications in advanced human interfaces. | |
| FLX1-4L
16:20 |
Circular Liquid Metal Strain Sensor for Stretchable Displays *Kenta Tsubouchi1, Toshihiro Yamamoto2, Masashi Miyakawa1, Hiroshi Tsuji1, Mitsuru Nakata1, Satoshi Aihara1 1. Japan Broadcasting Corporation (Japan), 2. NHK Foundation (Japan) |
| When a stretchable display is stretched, the displayed image becomes distorted. To correct this distortion, strain sensing is necessary. We developed a multi-directional circular strain sensor that is suitable for sensing dome-shaped deformation. The sensor, which can be integrated on the back of the display, consists of a sheet of elastomer embedded with liquid metal. We compare the performance of circular sensors with resistive and ... |
FLX2: Flexible Organic Devices
Dec. 3 17:10-18:10 Dahlia 2
Chair: Takashi Nagase (Osaka Metropolitan Univerisity)
Co-Chair: Hiroaki Jinno (Japan Aerospace Exploration Agency)
| FLX2-1
17:10 |
Invited A Robust OTFT Architecture Using DPP Materials: From History to Serendipity *Young Jun Park1, Sungho Kim1, Kwanghee Cho1, Jin Hee Kim1, Ji Hyun Hwang1, Euichan Kim1, Jonggyu Cheon1, Seoyoung Kim1, Seong Gyun Kim1 1. CLAP Co., Ltd. (Korea) |
| Diketopyrrolopyrrole (DPP) materials have emerged as one of the most promising organic semiconductors for OTFT applications, demonstrating exceptional charge carrier mobility and robust device performance. In this presentation, CLAP traces the remarkable journey of DPP from its serendipitous discovery in 1974 as an industrial pigment to its status as a cornerstone material in organic electronics. | |
| FLX2-2
17:30 |
Invited Doping in Organic Semiconductors Ping-An Chen1, *Yuanyuan Hu1 1. Hunan University (China) |
| Doping tunes electrical properties of organic semiconductors (OSCs) but remains challenging. I will present our advances: (1) novel doping mechanism and dopants for OSCs; (2) The application of doping for high-performance organic devices including organic field-effect transistors (OFETs), thermoelectrics, and photodetectors. | |
| FLX2-3L
17:50 |
High-Gain, Low-Bias Organic Electrochemical Amplifier Circuits with Conductive Polymers *Aiki Maruyama1, Takaaki Abe1, Shohya Matsuda1, Naoko Kurihira1, Mihoko Akiyama1, Takafumi Uemura1, Tsuyoshi Sekitani1, Teppei Araki1 1. The University of Osaka (Japan) |
| Flexible devices that conform to body shape enable long-term acquisition of bioelectric signals. However, amplifying microvolt-level inputs often requires high voltages. Here, we report organic electrochemical transistor (OECT) amplifiers with conductive polymer channels, achieving >100× gain under low-bias operation below 1 V. |
FLX3: Flexible and Stretchable Optoelectronic Devices (1)
Dec. 4 10:50-12:10 Dahlia 2
Chair: Toshimasa Eguchi (Sumitomo Bakelite)
Co-Chair: Takeshi Sasaki (NIPPON STEEL Chemical & Material Co., Ltd)
| FLX3-1
10:50 |
Invited Development of Solution-Processable Organic Photodetectors Towards Shortwave Infrared Sensing *Tomohide Murase1, Kazuhiro Mouri1, Chihiro Harada1, Yasuo Miyata1 1. Mitsubishi Chemical Corporation (Japan) |
| We have developed shortwave infrared (SWIR) organic photodetector (OPD) materials that enable the detection of SWIR light up to a wavelength of 1200 nm. OPDs fabricated with our IR6 showed external quantum efficiencies of approximately 40% at 1150 nm, 20% at 1180 nm, and 15% at 1200 nm. Additionally, organic CMOS image sensor prototypes have been demonstrated using our OPD materials. | |
| FLX3-2
11:10 |
Invited Light-Mediated Photomultiplication Organic Photodiode *Sungjun Park1, Jae-Hyun Kim1, Jaebin Jeong1 1. Ajou University (Korea) |
| We developed a light-mediated photomultiplication organic photodiode architecture, using the cyclic process of light absorption and emission as a photomultiplication process. The device shows the low dark current densities and high external quantum efficiencies. We used the device as a photoplethysmography sensor, measuring accurate cardiovascular signals even under low illuminance. | |
| FLX3-3L
11:30 |
Flexible Organic Photodetector Capable of Multimodal Detection of Light and Strain with Periodic Buckling *Tomohiro Anda1, Mari Koizumi1, Kento Yamagishi1, Tomoyuki Yokota1, Takao Someya1 1. The University of Tokyo (Japan) |
| Biomedical devices are generating attention for health care monitoring, such as light sensors or strain sensors. We report a flexible organic photodetector that can detect light and strain with periodic buckling structure, which shows high mechanical stability. Our flexible OPD functioned properly under an applied strain of 70%. | |
| FLX3-4L
11:50 |
Effect of Alkyl Chain Spacer on the Performance of Upconversion Organic Light-Emitting Diodes *Kazuki Kojima1, Moeto Okuda1, Takashi Kobayashi1, Hiroyoshi Naito1,2, Takashi Nagase1 1. Osaka Metropolitan University (Japan), 2. Ritsumeikan University (Japan) |
| Recently, the upconversion process has attracted attention for enabling low-voltage operation in organic light-emitting diodes. Here, we demonstrate that the alkyl chains of soluble fullerenes at the interface with rubrene layers effectively suppress electroluminescence from the fullerene layer and the radiative recombination of charge-transfer excitons. Furthermore, introducing dopants into the rubrene layer enhances luminance. |
FLX4: Flexible and Stretchable Optoelectronic Devices (2)
Dec. 4 14:10-15:10 Dahlia 2
Chair: Keiichi Akamatsu (FUJIFILM Corporation)
Co-Chair: Shohei Koizumi (Nikon Corporation)
| FLX4-1
14:10 |
Invited Development of Highly Efficient, Ultrathin Perovskite Solar Cells for Space Applications *Hiroaki Jinno1,2, Tomoyuki Yokota2, Daisuke Kobayashi1,2, Takahiro Makino3 1. Japan Aerospace Exploration Agency (Japan), 2. The University of Tokyo (Japan), 3. National Institutes for Quantum Science and Technology (Japan) |
| An ultrathin perovskite solar cell on 1 micron-thick plastic substrate gathers its attention as an emergent space solar cell thanks to its lightweight and flexible nature. Here we show highly efficient ultrathin perovskite solar cells with n-i-p structure maintaining excellent stability against heavy ion radiation such as space environment. | |
| FLX4-2
14:30 |
Invited Wearable and Waterproof Organic Optoelectronics Enabled by Interfacial Adhesion Enhancement *Sixing Xiong1,2, Baocai Du2, Kenjiro Fukuda2, Takao Someya2 1. Zhejiang University (China), 2. RIKEN (Japan) |
| Organic electronic devices (OEDs) have garnered significant attention in the wearable field due to their inherent flexibility and low weight. However, waterproofing OEDs without sacrificing mechanical properties and conformability presents a challenge. Here, we enhanced the interfacial adhesion between the active layer and electrodes to enable waterproof and wearable electronic devices. | |
| FLX4-3L
14:50 |
Precise Trap and Noise Characterisation Systems for Low-Noise Near-Infrared Organic Photodetectors *Yusaku Tagawa1, Ryota Fukuzawa1, Takao Someya1, Tomoyuki Yokota1 1. The University of Tokyo (Japan) |
| Near-infrared Organic Photodetectors (NIR-OPDs) promise flexible solution processing, but low-noise OPDs face noise and trap measurement limits. We study NIR-OPDs with inert-annealed electron transport layers, which were achieved with a D* of 1.3 × 1013 Jones at 850 nm and a trap density of 9.9 × 1013 cm−3 at 0.37 eV. The noise and trap measurements were demonstrated by developing low-noise measurement circuit systems. |
FLX5: Advanced Technologies for Flexible and Stretchable Displays
Dec. 5 9:00-10:00 Dahlia 2
Chair: Hideo Fujikake (Tohoku University)
Co-Chair: Mitsuru Nakata (NHK Science &Technology Research Laboratories)
| FLX5-1
9:00 |
Invited Recent Progress on Liquid Metals Technologies for Innovative Deformable Display Applications *Masashi Miyakawa1, Hiroshi Tsuji1, Tatsuya Takei1, Kenta Tsubouchi1, Toshihiro Yamamoto2, Mitsuru Nakata1, Satoshi Aihara1 1. NHK Science & Technology Research Laboratories (Japan), 2. NHK Foundation (Japan) |
| Stretchable technology is promising for reshaping displays to form novel 3D shapes, such as domes and spheres, and fabricating soft and body-conformable wearable displays. In this paper, we summarize our recent advances in stretchable LED displays utilizing liquid-metal wiring and crack-controlled stretchable conductors, highlighting their potential for future deformable and stretchable display applications. | |
| FLX5-2
9:20 |
Invited Stretchable Display Using Rigid Electronic Components *Takashi Sato1, Eiji Iwase2 1. National Institute of Advanced Industrial Science and Technology (AIST) (Japan), 2. Waseda University (Japan) |
| This study presents a stretchable display integrating rigid components via origami/kirigami substrates and liquid metal mounting. Uniformly deformable structures, self-folding fabrication, and robust mounting enable high stretchability and performance, overcoming the trade-off in conventional devices and enabling interactive spatial interfaces. | |
| FLX5-3
9:40 |
Development of Stretchable OLEDs with Enhanced Efficiency through Embedding on Polymer-Based Stretchable Substrate. Min Chul Suh1, *Ajay Shankar Nimbalkar1, Young Rok Kim1 1. Kyung Hee University (Korea) |
| This work introduces a highly efficient, stretchable top emitting organic light-emitting diode on a hyper-elastic polymer substrate (PSOLED). The incorporation of microcavity structures enhanced device efficiency, achieving a current efficiency of 163 cd/A with a narrow emission bandwidth of 22 nm on a planarized glass substrate. The PSOLED on PDMS elastomer demonstrates stable performance and sustain under 20% stretching. |
FLX6: Advanced Processes and Materials for Flexible Devices (1)
Dec. 5 10:50-11:50 Dahlia 2
Chair: Tadahiro Furukawa (Yamagata University)
Co-Chair: Tomoyuki Yokota (The University of Tokyo)
| FLX6-1
10:50 |
Invited Robust Reinforced Polymeric Nanofilms and Their Applications *Tomoyuki Yokota1 1. The University of Tokyo (Japan) |
| We have successfully fabricated ultrathin stretchable organic thin-film transistors (OTFTs) that seamlessly adapt to macroscopic contours and microscopic features. This multi-scale conformability was enabled through the reduction of the total device thickness to less than 3 µm, through substrate reinforcement and direct fabrication of the OTFT islands. | |
| FLX6-2
11:10 |
Invited Engineering Self-Organized Patterns in Soft Materials via Controlled Water Interactions *So Nagashima1 1. Nagoya University (Japan) |
| I will discuss how controlled water interactions induce self-organized patterns in soft materials. By harnessing surface instabilities in thin films, we create tunable micro- and nanostructures, offering new possibilities for surface design in soft and flexible electronic systems. | |
| FLX6-3L
11:30 |
Impact of Molecular Structural Design on the Electrical Performance of Stretchable Wires Printed with Silver-Filled Conductive Pastes *Masahiro Inoue1, Haruya Okamura1, Togo Hatori1 1. Gunma University (Japan) |
| This study demonstrates that the molecular design of PHU-based binders has a significant impact on the electrical reliability of stretchable printed wires, with aromatic and alicyclic units enabling tailored conductivity for flexible electronics. |
FLX7: Advanced Processes and Materials for Flexible Devices (2)
Dec. 5 14:10-15:10 Dahlia 2
Chair: Mitsuru Nakata (NHK Science &Technology Research Laboratories)
Co-Chair: Manabu Ito (TOPPAN Holdings Inc.)
| FLX7-1
14:10 |
Invited Realization of All Roll-to-Roll-Processed IGZO-TFTs with Siloxane/SiO2 Hybrid Structures *Ai Hanawa1, Tsukasa Kishiume1, Masayoshi Fuchi1, Makoto Nakazumi1, Juan Paolo S. Bermundo2, Yukiharu Uraoka2 1. Nikon Corporation (Japan), 2. Nara Institute of Science and Technology (Japan) |
| We developed an IGZO-TFT fabrication process using roll-to-roll technology, employing a hybrid siloxane insulator and thin SiO2 layers at GI/ESL interfaces on PI films. The SiO2 layer enhanced electrical performance, reliability, and outgassing suppression. High durability and mechanical stability were demonstrated, confirming suitability for mass production. | |
| FLX7-2L
14:30 |
Enforcing Consistency in Lensless Imaging Through Self-Supervision Training *Jose Reinaldo Cunha Santos A V Silva Neto1, Hodaka Kawachi1, Yasushi Yagi1, Tomoya Nakamura1 1. The University of Osaka (Japan) |
| State-of-the-art lensless reconstructions use paired lensed targets (beam-splitter), risking cross-optics bias and reduced physical fidelity. We instead train self-supervised on lensless measurements. A physics deconvolution layer (Wiener/5-step ADMM) coupled with a denoising UNet enforces data fidelity and supplies an implicit prior, improving perceptual quality with millisecond-scale inference. | |
| FLX7-3L
14:50 |
Enhancing Environmental Stability and Mechanical Robustness of ZnO Nanoparticle Organic Photodetectors via Branched Polyethyleneimine Interlayer *Chae-Eun Shim1,2, Sachi Awakura1, Hongting Chen1, Yusaku Tagawa1, Unyong Jeong2, Takao Someya1, Tomoyuki Yokota1 1. The University of Tokyo (Japan), 2. Pohang University of Science and Technology (Korea) |
| Zinc oxide (ZnO) nanoparticles are used as an electron transport layers (ETLs) in flexible organic photodetectors (OPDs) due to their favorable band alignment, transparency, and solution processability but face issues of defects, aggregation, and fragility. Incorporating a branched polyethyleneimine interlayer beneath ZnO ETL improves environmental and mechanical stability, enabling flexible, and ultrathin OPDs. |
FLXp1: Devices and Materials for Flexible Electronics
Dec. 4 16:20-17:40 Conference Management Room
| FLXp1-1 | Edge AI-Driven Optimization of Lateral CVD Growth of WS2 for Next-Generation TFT Materials *Xiumei Lu1,3, Fei-Sheng Huang2, Yi-Zhen Yu3, Hung-Pin Hsu1, Zi-Yan Zhan3,1, Yu-Qi Tang3, Frank Huang4, Kazuto Nishikawa5, Tsung-Pei Chiang6, Ching-Wei Tung1, Jia-Hui Chen3, Ting-Zhen Chu3, Pei-Chun Chen3, Chen-Ling Tsai3, Hsin-Liang Lin3, Cheng-Wei Wang7, Wei-Tse Pai8, Junichi Takeya9, Yi-Ping Wang3,7 1. Ming Chi University of Technology (Taiwan), 2. Taiwan Semiconductor Manufacturing Company (Taiwan), 3. National Taiwan University of Science and Technology (Taiwan), 4. Taiwan Denkei solution Corporation (Taiwan), 5. TechnoOptis Corporation (Japan), 6. Powerview Display Corporation (Taiwan), 7. Industrial Technology Research Institute (Taiwan), 8. Da-Yeh University (Taiwan), 9. The University of Tokyo (Japan) |
| Tungsten disulfide (WS2), a two-dimensional semiconductor, has attracted attention for its high mobility and direct monolayer bandgap, making it promising for next-generation micro-LED displays. This study utilizes edge AI computing, integrating simulations and experimental data to optimize lateral chemical vapor deposition (CVD) growth of WS2, advancing research on TFT materials. | |
| FLXp1-2 | Nano-Engineered Transparent Double-Layer Adhesives for Smart Adhesion Control of Flexible Displays *Jin-Wook Kim1, Hye Ryeon Park1, Gyu Jin Shin1, Jun Hyup Lee1 1. Soongsil University (Korea) |
| Smart transparent double-layer adhesives embedded with thermoresponsive nanoparticles decouple adhesion control from optical performance, thereby preserving surface clarity while ensuring reliable debonding. The adhesive films achieved >98% transmittance and >96% peel strength reduction after heating with no adhesive residues. This approach is suitable for post-patterning removal and multilayered smart adhesive layers in flexible displays. | |
| FLXp1-3 | Ultrafast-Sintered, Self-Healing Thermoformable Electrode Composite for 3D Free-Curved Automotive Digital Cockpit *Yoon-Su Kim1,2, Byeong-Kwon Ju2, Min Suk Oh1 1. Korea Electronics Technology Institute (Korea), 2. Korea University (Korea) |
| This study proposes a thermoformable Ag-flake/PUA composite ink that maintains low resistance without cracking during thermoforming. Strain-induced realignment of the flakes stabilizes the conductive network, while alloy particles photo-sintered by IPL markedly enhance conductivity without damaging the substrate. The composite also enables rapid thermal-healing, paving the way for printed, post-thermoformed fabrication of 3D Free-curved IME Devices. | |
| FLXp1-4L | The Method for Evaluating Stretchability of Stretchable Display *Hayoung Lee1, Aree Song1, Dongyeol Yeom1, Yongwoo Yi1, Jiwon Lee1, Jinwoo Choi1, Jaejoong Kwon1 1. Samsung Display (Korea) |
| This study proposes a system for assessing stretched ratio by measuring pixel pitch using a microscope under multi-axial stretching conditions. The comparative analysis indicates that stretched ratio obtained at the maximum stretched position most accurately represents the panel's limiting stretchability. The proposed method’s strong repeatability and reproducibility show its reliability as an evaluation method. | |
| FLXp1-5L | A Study on Structural Optimization of Ultra-Thin Glass for Improved Folding Characteristics in Foldable Displays *Hyeon-Do Choi1, Hyung-Chul Kim1, Kwan-Young Han1 1. Dankook University (Korea) |
| This study optimized the structure of ultra-thin glass (UTG) for foldable displays through mechanical simulations. By optimizing the etching structure of the folding area in a 50µm UTG and the thickness of the multilayered structure incorporating a top protective layer, an optimal design was derived that simultaneously enhanced both mechanical rigidity and folding characteristics. | |
| FLXp1-6L | Display Recovery Ratio: A Metric for Quantifying Recovery Characteristics in Stretchable Displays *Aree Song1, Hayoung Lee1, Dongyeol Yeom1, Yongwoo Yi1, Sangjun Seok1, Bomi Park1, Jiwon Lee1, Jinwoo Choi1, Jaejoong Kwon1 1. Samsung Display (Korea) |
| This study proposes the Display Recovery Ratio (DRR) to quantify the recovery characteristics of stretchable displays under multi-axial stress, demonstrating high repeatability and reproducibility. Analytical parameters, such as slope, are derived from recovery profiles to estimate residual deformation shape. The findings contribute to the development of a protocol for evaluating the recovery ratio of stretchable displays. | |
| FLXp1-7L | A Novel Flexible Polymer Photovoltaic Made from Phenolic Resin *Toshimasa Eguchi1, Hiroto Takaragi1, Kenta Osanai1 1. Sumitomo Bakelite Co., Ltd. (Japan) |
| Recently, it has been reported that resorcinol-formaldehyd resin, a kind of phenolic resin, exhibits photocatalytic function when synthesized under specific conditions. Using this resin, we fabricated a flexible photovoltaic cell and evaluated the property. | |
| FLXp1-8L | Fabrication and Characterization of Fully Printed Multimodal Sensors with Standardized Voltage Outputs *Junya Yoshida1, Yasuyuki Miura1, Ayana Hirayama1, Kento Eguchi1, Yasunori Takeda2, Tong Huang3, Atsushi Miyabo3, Fabrice Domingues Dos Santos4, Tomohito Sekine1 1. Graduate School, Yamagata University (Japan), 2. Innovation Center for Organic Electronics (Japan), 3. ARKEMA K.K. (Japan), 4. Piezotech (France) |
| Fully printed multimodal sensors integrating pressure, temperature, and slip detection were fabricated on a PEN substrate. Standardized voltage outputs were achieved using voltage divider circuits. Each sensor exhibited distinct, stable responses, with minimal interference during simultaneous operation, demonstrating the device’s potential for wearable electronics and robotic applications. | |
| FLXp1-9L | Development of Implantable Multimodal Tactile Sensing Systems Mimicking Human Skin for Soft Robotic Applications *Shoma Kamanoi1, Riku Sasaki1, Yoshihito Takabe1, Eri Kamiya1, Kenya Suzuki1, Yasunori Takeda2, Tong Huang3, Atsushi Miyabo3, Fabrice Domingues Dos Santos4, Tomohito Sekine1 1. Graduate School, Yamagata University (Japan), 2. Innovation Center for Organic Electronics (Japan), 3. ARKEMA K.K. (Japan), 4. Piezotech (France) |
| Implanting sensors in robotic hands physically protects the sensors from external environments, reducing sensitivity degradation and ensuring stable sensing performance. In this study, various sensors were embedded in a robotic hand, with an optimized skin structure that enhances the sensing characteristics. The result mimics human skin and achieves stable detection of multiple tactile signals. | |
| FLXp1-10L | Novel Concept Controlling Electrical Conductivity of Wires Printed with Conductive Pastes During Vacuum Forming *Rina Aida1, Takanori Fukushima1, Inoue Masahiro1 1. Gunma University (Japan) |
| This study examines dynamic percolation in stretchable wires made of polyhydroxyurethane binders with silver micro-flakes on thermoplastic substrates. Electrical resistivity decreases in two stages—pre-heating and forming—both influenced by process conditions and binder chemistry, which accelerates conductivity improvement. | |
| FLXp1-11L | Stretchability Improvement of PEDOT:PSS Thin Films Using Octylphenol Ethoxylate Surfactants *Hideyo Shimizu1, Masahiro Inoue1 1. Gunma University (Japan) |
| PEDOT:PSS pastes with varying POE chain lengths were water-based and thermally cured. Longer POE chains improved conductivity. Printed on polyurethane, the 35-degree surfactant enhanced stretchability and electromechanical stability under strain. | |
| FLXp1-12L | Investigation of Hole Storage Characteristics in Organic Floating-Gate Memory for NAND Flash Memory Applications *Keita Yamazaki1, Takashi Kobayashi1, Hiroyoshi Naito1,2, Takashi Nagase1 1. Osaka Metropolitan University (Japan), 2. Ritsumeikan University (Japan) |
| It was found that the hole storage characteristics of organic transistor memories based on dinaphtho[2,3-b:2,3-f]thieno[3,2b]thiophene (DNTT) can be enhanced by incorporating soluble fullerenes in the organic floating-gate layer and by forming a hole-injecting self-assembled monolayer on source-drain electrodes. The developed DNTT memories demonstrate NAND-type memory operation in a series-connected array of four memory devices. | |
| FLXp1-13L | Wavelength-Dependent Characteristics of Pentacene Floating-Gate Transistors for Optoelectronic Applications *Nakagawa Kazuki1, Shusei Hattori1, Takashi Kobayashi1, Hiroyoshi Naito1,2, Takashi Nagase1 1. Osaka Metropolitan University (Japan), 2. Ritsumeikan University (Japan) |
| The optical memory characteristics of top-gate organic transistors with a vacuum-deposited pentacene semiconductor layer and an organic floating-gate layer composed of PMMA and soluble pentacene have been investigated. The wavelength dependence of the threshold voltage shift was found to change significantly upon the addition of soluble fullerene to the floating-gate layer, which also affected the synaptic characteristics observed under red light. |
Workshop on Touch Panels and Input Technologies
| Dec. 3 | 13:30-14:50 | Dahlia 2 | INP1/VHF1 | AR/VR Interaction (1) Human-Robot Interaction |
| Dec. 4 | 9:00-10:00 | Cosmos 1 | INP2 | AR/VR Interaction (2) |
| Dec. 4 | 10:50-11:50 | Cosmos 1 | INP3 | Automotive Cockpit HMI |
| Dec. 5 | 11:10-12:30 | Conference Management Room | INPp1/VHFp3 | Interactive Technologies (1) |
| Dec. 5 | 11:10-12:30 | Conference Management Room | INPp2/PRJp2 | Interactive Technologies (2) |
| Dec. 5 | 11:10-12:30 | Conference Management Room | 3Dp3/INPp3 | Interactive Technologies and 3D/Hyper-realistic Displays |
INP1/VHF1: AR/VR Interaction (1) Human-Robot Interaction
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 3 13:30-14:50 Dahlia 2
Chair: Yuichiro Kume (Univ. of Electro-Commun.)
Co-Chair: Masamitsu Harasawa (NHK)
| INP1/VHF1-1
13:30 |
Invited Human Cognitive and Psychological Factors in Teleoperating Industrial Manipulators *Takako Yoshida1 1. Institute of Science Tokyo (Japan) |
| Remote robot manipulation via the internet is subject to unpredictable temporal delays, or “jitter”. This can cause a discrepancy between visual and haptic feedback, which impairs the human operator's sensation, including the sense of agency—the feeling of control over one's actions and outcomes. This paper presents our work on this topic and discusses the critical temporal delay required to maintain the user's ... | |
| INP1/VHF1-2
13:50 |
Invited Inferring Tactile Information via Camera Images *Kazuhiro Shimonomura1 1. Ritsumeikan University (Japan) |
| Tactile image sensors employing cameras have the capability of obtaining rich tactile information through image sequences with high spatial resolution. In recent years, with the development of image analysis technology, such tactile sensors have been used in applications such as robot manipulation, inspection, and human robot interaction. In this paper, we will discuss recent research examples and future directions. | |
| INP1/VHF1-3
14:10 |
Invited Tactile Sensing for Remote Perception *Alexander Schmitz1,2, Sophon Somlor1,2, Tito Pradhono Tomo1,2, Shigeki Sugano2 1. XELA Robotics (Japan), 2. Waseda University (Japan) |
| XELA Robotics provides tactile sensors (uSkin) for robot hands and grippers. Each sensing point occupies an area of about 4x4 mm2, also has a thickness of about 4mm. Each individual sensing point provides 3-axis force output (normal and shear forces) and has digital output to minimize the number of wires, simplifying the integration in robots. The force resolution is 0.1 gf, and at the ... | |
| INP1/VHF1-4
14:30 |
Invited Contact Control for Assembly Tasks Using a Soft Gripper with a Film-Type Tactile Sensor *Yuya Nakanishi1 1. Konica Minolta, Inc. (Japan) |
| To strengthen automation for assembly tasks, a soft gripper combined with a cobot can absorb disturbances from the surrounding environment.We enable the observation of grasped object states by embedding a film-type tactile sensor on a soft gripper.By using the time-rate of change of shear force obtained from this sensor, we can understand the contact conditions crucial for assembly tasks. |
INP2: AR/VR Interaction (2)
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 4 9:00-10:00 Cosmos 1
Chair: Makoto Sato (Inst. of Sci. Tokyo)
Co-Chair: Kazunori Imoto (Toshiba)
| INP2-1
9:00 |
Invited Olfactory Display: Progress Toward Real-Time Scent Presentation *Haruka Matsukura1, Hiroshi Ishida2, Yuichiro Kume1,3, Tota Mizuno1 1. The University of Electro-Communications (Japan), 2. Tokyo University of Agriculture and Technology (Japan), 3. Hirayoshi Shoten Research (Japan) |
| An olfactory display is a device that controls and presents scents to users in a spatiotemporal manner. It's fair to say that olfactory displays are still not widely adopted. The authors have researched foundational and peripheral technologies required to enable anyone to easily experience scented contents via real-time scent delivery. In this invited talk, we will introduce our efforts in these research areas. | |
| INP2-2
9:20 |
Invited Imperceptible Augmentation: Unobtrusive Information Embedding and Visual Guidance in Augmented Reality *Takefumi Hiraki1,2 1. University of Tsukuba (Japan), 2. Cluster Metaverse Lab (Japan) |
| This paper introduces Imperceptible Augmentation, a research framework that unifies approaches for embedding information and guidance in AR/MR without disturbing perception. By reviewing advances in display technologies, haptic feedback, and visual modulation, we highlight how unobtrusive interventions expand human experience while ensuring seamless integration of digital and physical realities. | |
| INP2-3
9:40 |
Gesture Reconstruction and Depth Estimation by Single-Pixel Imaging with Shifting Aerial Image *Hiroki Takatsuka1, Daichi Tasaki1, Shiro Suyama1, Hirotsugu Yamamoto1 1. Utsunomiya University (Japan) |
| We have realized gesture reconstruction and depth estimation by single-pixel imaging by use of an aerial display as a light source. Hadamard patterns of aerial images using AIRR optics are used for single-pixel measurements by placing the gesture at the aerial image position. By reconstructed images, gesture shapes can be recognized. Furthermore, by shifting the aerial images as illumination pattern, we successfully estimated the depth ... |
INP3: Automotive Cockpit HMI
Special Topic of Interest on Automotive Displays
Dec. 4 10:50-11:50 Cosmos 1
Chair: Nobuyuki Hashimoto (Japan Women's Univ.)
Co-Chair: Takanori Morioka (Mitsubishi Elec.)
| INP3-1
10:50 |
Invited Exploring Haptic Feedback: Anisotropic Textures in Button Design *Daiji Kobayashi1,2, Tomoka Aoki1 1. Chitose Institute of Science and Technology (Japan), 2. Chitose Silicon Research Center (Japan) |
| Users rely on haptic feedback when visual cues are absent, improving precision and reducing errors. ISO standards define tactile attributes and spatial orientation. Anisotropic haptic textures (AHT), like shark skin, suggest direction, but no standard links AHT to function. This study finds users align button function with the smoothest texture direction. | |
| INP3-2
11:10 |
Invited Augmenting HMIs using Force Sensing and User Identification *Iyad Nasrallah1 1. TouchNetix Ltd. (UK) |
| The design philosophy of display integrations into smart surface HMIs is predicated on the implementation of more than just simple touch functionality. Features such as force sensing and user identification can add novel interactivities, as well as improve functional safety. We will explore how the aXiom chip family is able to implement such interactions. | |
| INP3-3
11:30 |
Invited User Detection Integrated Touch Controller Solution *John Shanley1 1. Microchip Technology, Inc. (United States of America) |
| Automotive displays are expected to be interactive. Touchscreen displays are an integral part of the control interface in cars. Safety can require detection of the driver vs passenger. As automotive moves towards hands free, and fully automated, driving it becomes more essential to have user detection to ensure that critical systems are operated by the correct user. The article explains how a high-performance touch controller ... |
INPp1/VHFp3: Interactive Technologies (1)
Special Topic of Interest on Artificial Intelligence and Smart Society
Dec. 5 11:10-12:30 Conference Management Room
| INPp1/VHFp3-1 | Additional Eye-Catching Units for Aerial Signage Display Using Air Blowing, Smell Delivery and Interactive Experiences System *Anna Kamo1, Kunio Sakamoto1 1. Konan University (Japan) |
| The authors have researched floating 3D images which are above the corridor or street, and we hit on the question; Can ones notice what they haven't recognized yet? This paper describes methods to catch ones' attentions using air blowing, smell delivery and air heating and cooling units in our ‘Mirage:’ aerial display system. | |
| INPp1/VHFp3-2 | An Artificial Human Eye Camera for Performance Evaluation of XR Devices Liu Yang1, Xuao Yin1, *Takeo Matsukawa1, Haonan Zhang 1. Goertek Inc. (China) |
| This paper presents an artificial eye camera for key AR/VR image testing and eye tracking challenges. The bionic system uses a front meniscus lens and pupil-structured front aperture, enabling high-resolution imaging (<1.5% distortion) over a 36° full field of view. This biomimetic optical design provides a comprehensive testing solution for optimizing AR/VR optical performance and validating interactive user experiences. | |
| INPp1/VHFp3-3 | A System for Dynamically Evaluating the Accommodation State of the Eye Crystalline Lens *Liu Yang1, Xuao Yin1, Takeo Matsukawa1, Shuai Ma1 1. Goertek Inc. (China) |
| This paper presents a method for estimating eye accommodation based on Purkinje imaging. To address inadequate effective light reflections caused by eye movements and pupil occlusion, a model is developed to match the field of view (FOV) between the light source and camera. A neural network trained on diverse Purkinje images achieves 95% accuracy (±0.1D/±1°), enabling precise AR/VR vari-focal analysis. | |
| INPp1/VHFp3-4 | An Air-Driven Robot that Reproduces Human-Like Speech via Physical Vocal Structures *Yuta Nagai1, Fumiya Kondo1, Atsushi Nakamura1 1. Shizuoka University (Japan) |
| We developed an air-driven speech robot using an artificial lung and reed-type vocal folds. Stable phonation at approximately 100 Hz was achieved with a 150 um reed. The frequency was controllable over a 50 Hz range by adjusting reed length and airflow. This system offers a physical approach to human-like speech reproduction | |
| INPp1/VHFp3-5 | Acquisition of Fingertip Tactile Responses Under Vibratory Stimulation and Examination of Hardness Perception Characteristics Yuta Nagai1, Hayata Iizuka1, Hotaka Sano1, *Atsushi Nakamura1 1. Shizuoka University (Japan) |
| This study investigates fingertip tactile perception under vibration stimuli using textured objects of varying hardness. Acceleration data and subjective ratings were collected. Common vibration frequencies were found in the Z-axis, while X/Y axes showed material-specific patterns. Future work will improve displacement estimation using refined filtering and integration methods. | |
| INPp1/VHFp3-6 | Edge-Optimized Real-Time Sign Language Recognition Using YOLOv5, Signformer, and Physical Neural Networks *Yu-Ju Cheng1, Yu-Wu Wang1, Chi-Yen Huang1 1. National Changhua University of Education (Taiwan) |
| This work proposes a low-cost, real-time ASL translation system for edge devices, integrating YOLOv5 for gesture detection, Signformer for temporal modeling, and PNNs for efficient inference. Achieving 99.31% accuracy on a 14500-image validation set, the system is validated on a laptop and designed for future Raspberry Pi deployment. |
INPp2/PRJp2: Interactive Technologies (2)
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 5 11:10-12:30 Conference Management Room
| INPp2/PRJp2-1 | A Study on Coordinate Transformation for ADAS Information on a Windshield Display *Ai Weng1, Shi-Hwa Huang1, Tzu-An Chou1, Chien-Yu Chen1 1. National Taiwan University of Science & Technology (Taiwan) |
| This study introduces a coordinate transformation framework converting three-dimensional ADAS data into two-dimensional coordinates for windshield HUD projection. A test using four input points forming a rectangle showed the HUD output remained rectangular, confirming geometric consistency. The framework provides theoretical basis and initial validation, enabling future in-vehicle application with real-world data. | |
| INPp2/PRJp2-2 | Phase-Shifted Self-Interference Recording with a Metasurface for a Simplified Incoherent Digital Holography System *Teruyoshi Nobukawa1, Ryo Higashida1, Koki Imamura1, Yasutaka Maeda1, Tetsuhiko Muroi1, Kei Hagiwara1 1. Japan Broadcasting Corporation (NHK) (Japan) |
| A phase-shifted self-interference recording method using a metasurface is proposed to simplify the optical setup of incoherent digital holography. The proposed metasurface enables the generation of four self-interference holograms with different phase shifts under incoherent illumination. The capability for complex amplitude detection using this method was verified through proof-of-concept experiments. | |
| INPp2/PRJp2-3 | A Lightguide-Based Confocal Near-Eye Display System Using Volume Holographic Optical Elements with Refractive Power *Ying-Pin Tsai1,2, Wen-Kai Lin2, Shao-Kui Zhou1, Wei-Chia Su1 1. National Changhua University of Education (Taiwan), 2. Feng Chia University (Taiwan) |
| The use of microprojectors in VR and MR devices requires systems with tunable magnification. This study proposed a lightguide-based system using VHOEs with refractive powers in a confocal configuration, providing magnifications through the ratio between the focal lengths of the VHOEs. Finally, the aberration analysis is performed through simulation. | |
| INPp2/PRJp2-4 | Optical Design for a Virtual-Image Projection Lens with Vertical Exit-Pupil-Expansion *Shang-Da Yang1, Wen-Kai Lin2, Shao-Kui Zhou1, Wei-Chia Su1 1. National Changhua University of Education (Taiwan), 2. Feng Chia University (Taiwan) |
| This study proposes a simplified geometric optical system to achieve vertical exit pupil expansion without using surface relief gratings. By introducing a beam splitter and prism, the design enables vertical pupil expansion. Simulations and experiments confirm its feasibility and potential for compact and efficient optical integration. | |
| INPp2/PRJp2-5L | IMPaCT: Interactive Multi Projection System as a Collaborative Tablets Environment *Kota Someya1, Takashi Nishitsuji1 1. Toho University (Japan) |
| We propose an interactive system that turns physical paper into an interface, acting as a tablet alternative. The system is designed for multi-surface projection in collaborative works settings. To validate our approach, we developed a prototype that allows for the simultaneous operation of two paper interfaces. An evaluation showed a system latency of 300ms and a frame rate of 6.6 fps. |
3Dp3/INPp3: Interactive Technologies and 3D/Hyper-realistic Displays
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 5 11:10-12:30 Conference Management Room
| 3Dp3/INPp3-1L | Algorithmic Improvement for Computer Generated Holography Toward GPU Implementation of Hand-Drawn Interface *Rio Hanyu1, Takashi Nishitsuji1 1. Toho University (Japan) |
| This paper proposes an algorithm for parallel computation on a Graphics Processing Unit (GPU) of computer-generated holograms (CGHs) from hand-drawn input. As a feasibility study, the algorithm was tested on a CPU, showing improved image quality over the existing method. This result confirms the viability of our method for future high-speed implementation on a GPU. | |
| 3Dp3/INPp3-2L | Interactive Holographic Aerial Display for Fingertip Drawing *Naoya Hanaoka1, Yuzuki Nakatani1, Boaz Jessie Jackin1, Harutaka Shiomi1, Haruya Shiba1, Naoki Takada1 1. Kochi University (Japan) |
| We report on an interactive holographic aerial display for drawing fingertip trajectories. The proposed system uses an infrared sensor to capture the fingertip trajectory. We successfully projected the captured fingertip trajectories using a holographic projector and achieved a real image display in real time in aerial space by employing retroreflective material and a half mirror. | |
| 3Dp3/INPp3-3L | Implementation of a Novel Maxwellian Optics and Its Comparison with Conventional Approaches *Shuri Futamura1, Ryuichi Inui1, Tomoki Matsumoto2, Yasuhisa Nakano1, Yuichi Masumoto1, Tatsuji Tokiwa1 1. Hiroshima City University (Japan), 2. Institute of Advanced Media Arts and Sciences (Japan) |
| We propose a novel Maxwellian optical system combining a spherical multi-pinhole (SMP) and a transmissive mirror device (TMD). A prototype was implemented and compared with the conventional flat multi-pinhole (FMP) method. Results demonstrate that SMP provides a wider field of view up to ±45°, while challenges such as moiré remain. | |
| 3Dp3/INPp3-4L | Editing Color Boundaries in Cel-Shaded Volume Rendering *Toshiki Shinju1, Yoshinori Dobashi1,2 1. Hokkaido University (Japan), 2. Prometech CG Research (Japan) |
| We propose a method for editing the color boundaries in cel-shaded volume rendering. From a few user-placed control points, our method determines an appropriate color distance metric to achieve the desired quantization. The approach runs at interactive rates, producing stylized results with adjustable boundaries. |
Topical Session on Image Sensing Technologies
| Dec. 4 | 9:00-10:00 | Ran 1 | IST1 | Image Sensing Technologies (1) |
| Dec. 4 | 14:10-15:30 | Ran 2 | IST2 | Image Sensing Technologies (2) |
| Dec. 4 | 16:00-17:20 | Ran 2 | IST3 | DX Sensing and Radiation Imaging |
| Dec. 5 | 9:00-10:20 | Ran 2 | IST4 | Image Processing |
| Dec. 5 | 10:50-12:10 | Ran 2 | IST5 | DX Sensing, Radiation Imaging and Far-Infrared Image Sensing |
| Dec. 3 | 15:40-17:00 | Conference Management Room | ISTp1 | Image Sensing Technologies (3) |
| Dec. 3 | 15:40-17:00 | Conference Management Room | ISTp2 | Image Sensing Technologies for ARVR Applications |
| Dec. 3 | 15:40-17:00 | Conference Management Room | ISTp3 | Image Sensing Technologies for AI and Smart Society |
IST1: Image Sensing Technologies (1)
Dec. 4 9:00-10:00 Ran 1
Chair: Takashi Tokuda (Institute of Science Tokyo)
Co-Chair: Masanori Koshimizu (Shizuoka University)
| IST1-1
9:00 |
Invited Progress in Development of Advanced High Dynamic Range CMOS Image Sensors *Ken Miyauchi1,2,3 1. Brillnics Japan Inc. (Japan), 2. Tohoku University (Japan), 3. Ritsumeikan University (Japan) |
| In this paper, the latest high dynamic range (HDR) technologies for CMOS image sensors (CISs) are presented. In particular, the three single-exposure HDR (SEHDR) technologies of multiple-conversion gain (CG), lateral overflow integration capacitor (LOFIC), and triple-quantization (3Q), which have been developed by the author and his research team, are summarized. | |
| IST1-2
9:40 |
CMOS Light-modulated Oscillator Using On-chip Photodiode *Reyhan Ramadhan1, Masato Saito1, Yasufumi Yokoshiki2, Takashi Tokuda1 1. Institute of Science Tokyo (Japan), 2. Aoyama Gakuin University (Japan) |
| We present a light-modulated oscillator for photosensing function in microelectronic devices. This circuit is designed to work with on-chip photodiode by incorporating a voltage-controlled oscillator and level shifter. Implementation and characterization in 180 nm CMOS process shows that the circuit exhibit consistent frequency response, which can be quantized to obtain light intensity values. |
IST2: Image Sensing Technologies (2)
Dec. 4 14:10-15:30 Ran 2
Chair: Ken Miyauchi (Brillncs Japan)
Co-Chair: Masayuki Ikebe (Hokkaido University)
| IST2-1
14:10 |
Two-Transistor Active Pixel Sensor Based on Double Gate a-IGZO TFTs Intended for Low-Dose Direct X-ray Imaging *Haorong Xie1, Weikang Yan1, Xianming Li1, Kai Wang1, Yihong Qi2 1. Sun Yat-Sen University (China), 2. Shenzhen Insitute of Advanced Technology (China) |
| Amorphous IGZO TFT exhibits high mobility and high on-off current ratio compared to amorphous silicon TFT. The proposed pixel sensor uses a two-transistor structure to perform logarithmic-exponential operations between input and output signals, achieving an output current gain of over 3×105% with stable output response at input frequencies below 0.1 MHz. This work is of significant importance to the field of low-dose direct X-ray imaging. | |
| IST2-2
14:30 |
Numerical Investigation of Efficient Sampling for Single-Pixel Imaging via Edge Information *Yu Yamazawa1, Keyna Sugimoto1, Fan Wang1, Tomoyoshi Ito1, Tomoyoshi Shimobaba1 1. Chiba University (Japan) |
| Single-pixel imaging (SPI), a novel imaging technique, faces a challenge in the trade-off between the quality of the reconstructed image and the number of measurements. In this study, we propose an efficient sampling method using edge detection for SPI based on basis transform and verify its effectiveness through simulation. | |
| IST2-3L
14:50 |
Invited The Image Sensor Technology: Trends and Future Prospects *Kei Shiraishi1 1. Sony Semiconductor Solutions Corporation (Japan) |
| Image sensors have evolved from their application in cameras to technologies that enable object recognition, decision-making, and information acquisition. This paper reviews the development of CMOS image sensor device technology and advancements in sensing technologies. Furthermore, the societal transformation with the widespread integration of information sensing is examined. |
IST3: DX Sensing and Radiation Imaging
Dec. 4 16:00-17:20 Ran 2
Chair: Go Okada (Kanazawa Institute of Technology)
Co-Chair: Masanori Koshimizu (Shizuoka University)
| IST3-1
16:00 |
Scintillation Properties of Surface-modified LiAlO2 Nanoparticle-loaded UV-cured Plastic Scintillators for Neutron Detection *Naru Hayashi1, Haruhisa Tsukahara1, Masanori Koshimizu1 1. Shizuoka University (Japan) |
| We have developed surface-modified LiAlO2 nanoparticle-loaded UV-cured plastic scintillators for neutron detection. The 10 wt% LiAlO2 nanoparticle-loaded sample had the high scintillation light yields among the prepared samples. The scintillation light yield of the samples was 3100 photons/neutron. This yield was 3.8 times of that of EJ-254, which is a commercially available B-loaded plastic scintillator. | |
| IST3-2
16:20 |
Enhancement in Performance of Plastic Scintillators Utilizing Thermally Activated Delayed Fluorescence *Taiyo Kanenari1, Maya Atsumi2, Yuichi Kitamoto2, Shuichi Oi2, Tetsutaro Hattori2, Hiroki Kawamoto2, Yutaka Fujimoto2, Keisuke Asai2, Masanori Koshimizu1 1. Shizuoka University (Japan), 2. Tohoku University (Japan) |
| To enhance scintillation light yield (LY), we have developed plastic scintillators added molecules exhibiting thermally activated delayed fluorescence (TADF; BMes-1). Under X-ray excitation, the plastic scintillators exhibited an emission originates from the fluorescence and TADF of BMes-1 via energy transfer from polystyrene. We achieved a LY of 19200 photons/MeV through the utilization of TADF. | |
| IST3-3L
16:40 |
Invited Overview of SOI-Based Image Sensors for Quantum Imaging Applications *Ayaki Takeda1 1. University of Miyazaki (Japan) |
| Silicon-on-Insulator (SOI) technology offers a robust platform for radiation image sensors, providing high integration and radiation tolerance. We present an overview of SOI-based image sensors applied to various quantum imaging modalities, including X-rays, gamma rays, neutrons, and muons. Their versatility demonstrates potential for next-generation multi-modal radiation detectors. |
IST4: Image Processing
Special Topic of Interest on Artificial Intelligence and Smart Society
Dec. 5 9:00-10:20 Ran 2
Chair: Masayuki Ikebe (Hokkaido University)
Co-Chair: Takashi Tokuda (Institute of Science Tokyo)
| IST4-1
9:00 |
Invited Fluorescence Nuclear Track Detection Performances of Ag-doped Phosphate Glasses with Different Alkaline Components *Go Okada1, Masanori Koshimizu2, Shin-ichi Sawada3, Hiroshi Koshikawa3, Satoshi Kurashima3, Morihisa Saeki3, Hidehito Nanto1 1. Kanazawa Institute of Technology (Japan), 2. Shizuoka University (Japan), 3. National Institute for Quantum Science and Technology (Japan) |
| Radiophotoluminescence (RPL) shows promise for nuclear track detection. However, few suitable RPL materials exist. We recently identified novel RPL-active compounds with strong potential. This study explores their feasibility and the underlying RPL physics to advance related technologies. This study compares performances of Ag-doped phosphate glasses with different alkaline components. | |
| IST4-2
9:40 |
Zero-Shot Noise2Noise Denoising for Underwater Image Enhancement *Yi-Tsung Pan1, Kuo-Jui Hu1, Ching-Chung Huang2, Ya-Ling Pan2, I-Chuin Chen1, Hsiang-Yu Tsai1 1. National Taiwan University of Science and Technology (Taiwan), 2. National Changhua University of Education (Taiwan) |
| Underwater images often suffer from complex noise patterns. And it is difficult to have a clean-noisy image pairs at the same time. How to denoise underwater images is the research goal. In this research, a simple 3-layer network is demonstrated, which can quickly achieve improved quality images without any pre-training data or knowledge of the noise distribution, and remove noise at a lower computational cost ... | |
| IST4-3
10:00 |
Mixed Reality and Non-contact Manipulation of Machine Learning-segmented 3D X-ray CT images *Hiroki Kase1, Katsuyuki Takagi1, Toru Aoki1 1. Shizuoka University (Japan) |
| In this study, we developed a non-contact, intuitive 3D visualization system by applying automatic segmentation processing using machine learning to 3D image data obtained by 3D X-ray computed tomography (CT), and then integrating mixed reality technology. This system enables the three-dimensional recognition and manipulation of organ structures by utilizing a spatial reality display and motion capture on 3D data of organs labeled by machine learning. |
IST5: DX Sensing, Radiation Imaging and Far-Infrared Image Sensing
Dec. 5 10:50-12:10 Ran 2
Chair: Ayaki Takeda (Miyazaki University)
Co-Chair: Masanori Koshimizu (Shizuoka University)
| IST5-1
10:50 |
Registration of Neutron Fluence at Wide Dynamic Range Using Thermoluminescence Materials Based on Tm-doped LiCaBO3 Hajime Komiya1, Hiroki Kawamoto1, Yutaka Fujimoto1, Genichiro Wakabayashi2, Keisuke Asai1, *Masanori Koshimizu3 1. Tohoku University (Japan), 2. Kindai University (Japan), 3. Shizuoka University (Japan) |
| We have developed thermoluminescent (TL) materials based on Tm-doped LiCaBO3 for measurements of neutron fluence. Based on the samples with nominally the same chemical composition and different isotope contents, we have successfully observed the TL response at neutron fluence of 105-1011 neutrons/cm2. | |
| IST5-2
11:10 |
Development of UV-Emitting Ce-Doped YAP Fine Particle Scintillators *Yuma Takahashi1, Masanori Koshimizu1 1. Shizuoka University (Japan) |
| We developed UV-emitting Ce-doped YAP (YAlO3) fine particle scintillators. The fine particles were synthesized via the sol-gel method. TEM observations revealed that the particles exhibited angular morphologies with sizes of approximately 400-500 nm. Upon X-ray irradiation, YAP:Ce 1% samples exhibited UV emission attributed to Ce3+ ions. | |
| IST5-3L
11:30 |
Invited Development of VGA Format High Detectivity Microbolometer FPAs using Semi-Conducting SWCNT Networks *Tomo Tanaka1,2, Masahiko Sano1, Masataka Noguchi1,2, Megumi Kanaori2, Toshie Miyamoto1,2, Ryota Yuge1,2 1. NEC Corporation (Japan), 2. The National Institute of Advanced Science and Technology (Japan) |
| In this study, to improve the responsivity, a second photosensitive layer was designed in addition to the conventional bolometer structurer. By fabricating a second photosensitive layer, the responsivity increased by 1.5 times. Since the noise levels are same level, an improvement in D* was expected. |
ISTp1: Image Sensing Technologies (3)
Dec. 3 15:40-17:00 Conference Management Room
| ISTp1-1 | HSCU-Net: Low-Light Image Enhancement via U-Net with Integrated CBAM and SE Block *I-Chuin Chen1, Kuo-Jui Hu1, Yu-Wen Lee1, Hsiang-Yu Tsai1, Yi-Fang Yan1 1. National Taiwan University of Science and Technology (Taiwan) |
| This study proposes a HSCU-Net (Hybrid SE-CBAM U-Net) where SE modules substitute CBAM at the outermost skip connections to overcome CBAM’s limited boundary-layer feature capture and suppress noise, while retaining CBAM in intermediate skip connections to enhance low-light feature representation. | |
| ISTp1-2L | Properties of YF3:Ce,Tb Nanophosphors Synthesized by the Solvothermal Method *Naruki Yoshimura1, Kotaro Yamaguchi1, Hiroko Kominami1, Kazuhiko Hara1, Katsuyuki Takagi1, Toru Aoki1 1. Shizuoka University (Japan) |
| YF3:Ce3+,Tb3+ nanophosphors were synthesized by the solvothermal method with varied Ce/Tb concentrations. XRD analysis confirmed the crystalline phase and size, while PL / PLE, and XL spectra revealed energy transfer from Ce3+ to Tb3+, resulting in enhanced Tb3+-related visible emission, demonstrating suitability for X-ray-excited photodynamic therapy applications. |
ISTp2: Image Sensing Technologies for ARVR Applications
Special Topic of Interest on AR/VR and Hyper Reality
Dec. 3 15:40-17:00 Conference Management Room
| ISTp2-1 | Enhancing 3D Gaussian Splatting with Preprocessing Strategies from Source Videos *Cian-Wei Wang1, Kuo-Jui Hu1, Yu-Fang Chang1 1. National Taiwan University of Science and Technology (Taiwan) |
| This research proposes an efficient source video preprocessing strategy that improves rendering quality, training efficiency, and PSNR for 3D Gaussian Splatting. Additionally, it significantly enhances training efficiency on moderate computing hardware. |
ISTp3: Image Sensing Technologies for AI and Smart Society
Special Topic of Interest on Artificial Intelligence and Smart Society
Dec. 3 15:40-17:00 Conference Management Room
| ISTp3-1 | An Eye Tracking Method Using Convolutional Neural Network Based on the Imaging Light Path *Chi Min Liu1, Ying Pin Tsai1, Wen Kai Lin2, Fu Li Hsiao1 1. National Changhua University of Education (Taiwan), 2. Feng Chia University (Taiwan) |
| This study proposes a pupil tracking method based on the HMD imaging optical path. A ResNet-50 CNN trained on synthetic data performs regression and classification, while Grad-CAM visualizes the output to enhance interpretation and understanding of the prediction task. |