bluuebunny/crossref_metadata_2025 huggingface dataset:
20‐1: A novel liquid crystal planar display structure based on fringe field effect
Authors: LI An-ran , YU Xin-yi , Komitov Lachezar , SRIVASTAVA Abhishek K
Published: June 2024

The liquid crystal display (LCD) continues to hold a prominent position in the display industry. These years' key research topic is the fringe field effect, which aims to improve the LCD's performance. A new LCD structure utilizing the fringe field effect has been identified as a promising solution. This structure allows for the control of the electromagnetic field of the liquid crystal cell by regulating the voltage of the Circular‐Hole and Planar Electrode cell (CHPEC). This innovative structure is comprised of nematic liquid crystals (LCs) with negative dielectric anisotropy, a two‐electrode system consisting of a Circular‐Hole ITO structure on the top layer and a Planar structure on the bottom layer, and a SiO2 porous structure. Finite element simulation tests have verified the electric field strength, transmittance, and contrast of the cell and the matrix structure, meeting the design objectives. This breakthrough has significant potential for application in the display field.
23‐5: Application of Non‐Conductive Paste (NCP)‐assisted bonding for Interconnection between Micro‐LED and Backplane
Authors: Dong Xiaobiao , Cao Xuan , Huang Xiuqi , Wang Kang , He Li , Chen Hang , Cui Yongxin , Qian Xianrui
Published: June 2024

Micro‐LED, as one of the most promising advanced display technologies, has attracted increasing research interest from academia and display industry. With the outstanding performance in brightness, lifetime, and contrast, Micro‐LED display shows tremendous potential for applications in various electronic terminals. The bonding between Micro‐LED and backplane is the key technology that affects the industrialization of Micro‐LED display at present. The common bonding technology can be classified as metal bonding and ACF bonding. Metal bonding has the advantages of low cost and high bonding strength. However, the bonding yield is affected by the difficulties of thermal mismatch and short circuit. In order to solve these difficulties, we developed a bonding process based on Non‐Conductive Paste (NCP). That is, the Micro‐LED transfer onto the backplane with a lay of NCP, then realizing the conductivity between the Micro‐LED and the backplane by thermocompression bonding. In this paper, we applied this technology in 180 × 160 pixels full‐color Micro‐LED display, and achieved more than 99.99% bonding yield by testing the NCP material characteristics, temperature and pressure.
27‐1: Invited Paper: Nanocomposites and Alloys Based on Porous Silicon Filled with Metals and Semiconductors
Authors: Grevtsov Nikita , Lopato Uliana , Dolgyi Alexey , Chubenko Eugene , Bondarenko Vitaly , Smirnov A. , Stsiapanau A. , Dronov A. , Gavrilin I. , Gavrilov S.
Published: June 2024

A variety of micro‐ and nanocomposite materials based on electrochemically‐acquired porous silicon are produced and evaluated in terms of their applicability to display technology. It is shown that porous silicon provides a versatile and well‐adjustable template for filling with other materials, which can outright change its electrophysical parameters. While, in terms of display applications, porous silicon layers are mostly prominent for their photohiminescence not akin to monocrystalline silicon, this property can be additionally enhanced by employing a variety of electrochemical techniques to form metal deposits of certain shapes.
27‐2: Invited Paper: Reproducible Characterization of Microdisplays using Imaging Luminance Measurement Devices (ILMDs)
Authors: Rotscholl Ingo , Kirchhoff Kilian , Schramm Stefan , Liu Bob , Krüger Udo
Published: June 2024

In this contribution, we present typical practical implications of high magnification lenses required for camera‐based microdisplay measurements and analyze their impact on existing measurement methods for DeMURA, resolution and contrast. Furthermore, we show hardware and software‐based methods to improve or handle the shortcomings of these high‐magnification lenses.
28‐2: Invited Paper: Templated Liquid Crystal Photonic Devices
Authors: Sun Changli , Tang Mingyuan , Ding Weiping , Lu Jiangang
Published: June 2024

Many researches have been carried out on the high performance of cholesteric liquid crystal (CLC), blue phase liquid crystal (BPLC) and sphere phase liquid crystal (SPLC), such as wide bandwidth, high reflectivity, multi‐wavelength, and good thermal stability. Among them, templating process is an attractive technique, which may induce the twist structure by polymer template and achiral nematic liquid crystals (LCs). A multi‐wavelength filter with Templated‐BPLCs was demonstrated that it may get much narrower bandwidth, better thermal stability compared with the CLC filters. Furthermore, the central wavelength and bandwidth can be easily controlled by the fabrication process and the optimization of the material concentration. And a high reflectivity CLC filter with a single‐layer template was proposed, which may reflect both right‐ and left‐handed polarized light.
36‐1: Low‐frequency flicker mechanism and improvement solutions of a liquid crystal display
Authors: Huang Lianglong , Tao Jian , Liu Fan , Xiang Yun , Wang Yue , Li Bangrong , Zhao Mang , Li Yafeng , Gong Qiang , Li Yongkai , Lian Xiaoxu , Xue Jingfeng
Published: June 2024

Low refresh rate liquid crystal displays have been proposed to reduce power consumption, which is already the trend. In our early low‐temperature polycrystalline silicon liquid crystal displays, low‐frequency driving caused the screen to flicker. We investigated the flicker mechanism and improvement solutions in this paper. The flicker mechanism is mainly related to thin‐film transistor leakage current, capacitive coupling effect, and cell material property. By adopting some solutions, the flicker of gray level 127 can reach‐60dB in a 20Hz 13.5‐inch 2.8K demo. These results contribute to the development of low‐power consumption displays.
36‐5: Research on The Structure of Low Color Crosstalk Grillless Optical Cavity Based on Partition Toning Technique
Authors: Wu Wenlin , Xiao Xiangzhi , Xu Sheng , Chen Enguo , Guo Tailiang , Yan Qun
Published: June 2024

In response to the problems of the existing partition toning technology based on liquid crystal backlight needs to add metal physical grilles with high alignment accuracy to prevent the crosstalk of different colors and brightnesses of light between the partitions, this paper proposes a structural design of the optical cavity without grille and its key parameter value intervals, and puts forward a low‐color crosstalk evaluation method. Based on this method, the light output effect of the diffuser is evaluated, and the distance between the diffuser and the RGB mini‐LED light source as well as the structural parameters of the light‐guiding cavity between them are reasonably adjusted. The grilleless optical cavity structure studied in this paper has the advantages of simple structure, low cost and easy implementation, ensuring regional dimming and regional color mixing while further improving the color crosstalk phenomenon between the backlight partitions.
37‐1: Invited Paper: Effect of Organic Charge Generation Layer on Performance of White OLED Devices
Authors: Quan Wei , You Juanjuan , Shen Yongqi , Bo Bin , Bian Menghua , Li Chun , Wang Linlin , Yu Donghui , Shi Shoulei , Yan Guang , Shih Huai-Ting , Yu Jianwei
Published: June 2024

A novel CGL structure is designed and studied to improve the lateral leakage in stacked OLED devices. Experiments confirmed that the position of transverse leakage mainly occurred in the CGL layer, and the new CGL structure was realized by optimizing the n‐CGL material. Compared with the reference CGL structure device, the voltage of the new structure device decreased by 0.05v, and the current efficiency increased by 5%. The average value of the color gamuts was improved by 5%, demonstrating the effectiveness and stability of the new CGL structure. The mechanism of the new CGL structure was verified by EOD. The carrier transmission performance of the new CGL structure was worse, but the carrier injection performance was improved, so as to improve the lateral leakage problem under the premise of ensuring the role of CGL.
37‐3: Invited Paper: Novel Stacked OLED and Pixel Design for Enhanced Lifetimes and Improved PPI
Authors: Yuan Can , Wan Xiang , Wang Xinxin , Liu Xiuting , Zhang Xiangze , Yuan Zhidong , Cheng Xuelian , Li Yongqian , Yu Jianwei
Published: June 2024

In this paper, we proposed a novel stacked OLED device, which consists of a single layer of RGB units stacked vertically together. In the stacked OLED display, each pixel comprises only one unit OLED, with independent red, green and blue emissive units. Meanwhile, the pixel aperture ratio is about triple of traditional displays. The color gamut with DCI‐P3 (CIE1931) of the stacked device reaches 99% without color filter. In addition, we explored a pixel circuit suitable for the device, which theoretically improves the lifetime of the device by about 300% in this drive mode.
37‐4: A phenanthroline derivative modified by arylphosphine oxide moiety as nCGL in tandem OLEDs
Authors: Wu Shao‐Guang , Song Min , Zhao Wan‐Qian , Hu Zi‐Fan , Zhou Dong‐Ying , Zhu Xu‐Hui , Liao Liang‐Sheng
Published: June 2024

5‐(6‐(Diphenylphosphinyl)‐2‐naphthyl)‐1,10‐phenanthroline (pPhen‐NaDPO) is reported as a promising n‐type charge‐generation layer in efficient and stable tandem OLEDs.
38‐2: Invited Paper: Evaluating Optical Performance and Image Quality in Augmented Reality Eyewear: Standardization, Challenges, and Measurement Methods
Authors: Mou Xi , Peng Xiaopeng , Mou Tongsheng
Published: June 2024

See‐through eyewear displays provide immersive augmented reality experiences by superimposing virtual contents over the view of real‐world scenes. Advancements in AR technologies have led to increasingly complicated design of see‐through eyewear displays (EWDs), presenting challenges to the measurement of their optical parameters and performances. Here we review the challenges and the progress in standardizing such measurements. The latest standard IEC 63145‐22‐20 is discussed, which defines industry benchmarks for evaluating the eyewear displays.
39‐1: Invited Paper: RGB Nanowire Based Micro‐LED Chips For Efficient and High Performance Ultra Fine Pitch Direct View Displays
Authors: Robin Ivan-Christophe , Tchoulfian Pierre , Sannicolo T. , Malier Yoann , Butaud Eric , Gilet Philippe
Published: June 2024

One of the micro‐LED direct view display major challenges is to find ways of drastically dropping the cost, for instance, by reducing the micro‐LED size, simplifying the assembly process and improving the assembly yield.

In this paper, we present Aledia's GaN‐on‐Si nanowire (NW) LED technology made on standard 8 “Si wafers, scalable to 12” wafers. We will present two components using our NW technology and their use case for the manufacturing of micro‐LED direct view fine pitch display:

NWs RGB three color chips obtained using quantum dot (QD) color conversion at chip level. The RGB chips can then be transferred on PCB or glass or TFT substrates for panel manufacturing.

The integration within the same chip of a three color RGB chip together with its CMOS driving electronics. Those chips allow to obtain an active‐matrix architecture on any passive backplane without the use of TFT.
41‐2: Invited Paper: Active‐matrix Digital Microfluidics System for High‐Throughput Droplet Sample Processing
Authors: Jiang Shengzhe , Wang Dongping , Zhang Kaidi , Lin Baiquan , Ma Hanbin , Yu Jun
Published: June 2024

We introduce a high‐throughput field programmable active‐matrix digital microfluidics system designed for large‐scale biological experiments. The fabricated microfluidics chip consists of a 640×280‐pixel array, each pixel measuring at 100×100 μm . This configuration enables the addressing of individual pixels, facilitating parallel droplet manipulation. The system utilizes 9T2C GOA circuits for generating row scanning signals, and 3T1C pixel circuits to provide driving voltage to individual pixels. The system exhibited a notably elevated proficiency in high‐resolution droplet generation and manipulation, with over 80% droplet division success rate and more than 20 hours of stable single‐droplet movement. The minimum volume of an individual droplet amenable to stable manipulation is 1.2 nL, featuring a droplet resolution of four pixels, which is two orders of magnitude less than the previously reported volume at IEDM. This research lays the foundation for the utilization of digital microfluidics in the realms of in vitro diagnostics and biological and chemical experiments focused on single‐cell analyses.
41‐3: A High‐Accuracy Display Compensation Method for Full‐Display with Camera
Authors: Zeng Chao , Lee Eunho , Shen Lixia , Lee Kyoungwon , Kim Changman , Shang Fei
Published: June 2024

Full‐Display with Camera (FDC), also known as Under‐Display Camera (UDC), maximizes the usable area of the display panel. Its display performance is limited by the transparence requirements. We proposed a high‐accuracy method to improve its display performance. The experiment shows that the proposed method can significantly improve the display performance of the FDC panels.
42‐2: Spatial reality display system based on eye tracking and pixel interleaving technology
Authors: Ma Xitong , Wang Tingting , Li Xin , Zhang Shuguo , Duan Ran , Zhou Xing , Song Zheyuan , Jiang Xingqun
Published: June 2024

With the development of naked‐eye display technology, users can experience real stereoscopic effects more freely without glasses. This paper introduces the BOE's second generation 31.5‐inch 8K naked‐eye 3D display system, which improves optical path accuracy and reduces system delay through eyetracking and synchronization technology. Special optimizations have been made for mobile and wide‐angle viewing scenes, significantly improving the display effect.
42‐5: Research on Lip Recognition Algorithm in Display Interaction
Authors: Liu Chao , Zhong Xuefei , Zhang Xiong , Fan Zhaowen
Published: June 2024

The lip‐reading recognition algorithm, founded upon the TCN (Temporal Convolutional Network) deep learning architecture, has been refined and harnessed to devise a display interaction system tailored for controlling a smart TV through lip‐recognition interaction. This system enables the execution of functions such as power toggling, volume adjustment, and channel switching. Evaluation of the outcomes reveals swift convergence of the model during training, attaining a lip command recognition accuracy exceeding 86%.
44‐1: Invited Paper: Absorption Problem of Multilayer Optical Structures Based on High Anchoring Azo‐dye Photoalignment of Polymerizable Liquid Crystals
Authors: Muravsky Alexander , Stanevich Veranika , Kukhta Iryna , Chepeleva Daminika , Yakovleva Alina , Murauski Anatoli
Published: June 2024

Chemical compatibility of water‐soluble azo‐dye photoalignment materials opens up new possibilities of thin‐film optical devices fabrication with advanced characteristics combining several polymerizable liquid crystal layers into multilayer structures of broadband quarter or half wave retarders. However when the azodye photoalignment layer is placed in‐between two layers of polymerizable liquid crystal significant increase of dye absorption is observed. Analysis of this ‘Absorption Problem’ concludes azodye inter‐layer field is the cause of polarization and cis‐trans equilibrium change. New water‐soluble azo‐dye photoalignment material AmA‐2522 is suggested as perspective problem solution.
45‐1: Invited Paper: High‐Performance Narrowband Emitters for Stable Organic Light‐emitting Diodes with Reduced Efficiency Roll‐Off
Authors: Yang Zhihai , Jiang Simin , Li Deli , Bai Keyan , Su Shi-Jian
Published: June 2024

Narrowband organic emitters are promising for their potential applications in wide‐color gamut and high‐resolution displays. Multiple resonance (MR) thermally activated delayed fluorescence (TADF) emitters are flourishing because of their attractive narrow emission bandwidth and excellent device performance. In this work, a series of MR‐TADF emitters embedded with sulfur, sulfone, and carbonyl have been developed, and their intrinsic effects on the exciton dynamics like intersystem crossing rate (kISC) and reverse intersystem crossing rate (kRISC) and full width at half maximum are systematically investigated. Benefitting from the heavy atom effect of the sulfur atom, fast kRISC are achieved to give highly efficient and stable organic light‐emitting diodes with reduced efficiency roll‐off. By fusing donor unit containing carbonyl into boron‐nitrogen compounds, carbonyl reinforced short range charge transfer can induce a red‐shifted pure‐green emission with simultaneous fast kRISC and narrow emission bandwidth, and a moderate device lifetime of LT90 (the time to 90% of the initial luminance of 1000 cd m‐2) of 127.3 h is achieved for the device utilizing TCZBAO as emitter.
45‐3: Comprehensive Exploration of Exciton Quenching in OLEDs through Combined Characterization and Computational Simulation
Authors: Stanzani Edoardo , Sem Stefano , Zeder Simon , Georgakopoulos Vasileios , Züfle Simon , Jenatsch Sandra , Ruhstaller Beat
Published: June 2024

Organic light‐emitting diodes (OLEDs) feature flexible and homogeneous large area emission. Although, in terms of performance, OLEDs are typically characterized by an efficiency drop at high brightness levels. This phenomenon, usually addressed as efficiency roll‐off, is mainly caused by exciton quenching processes. Here, we introduce an improved methodology for exploring exciton quenching in OLEDs, which integrates both characterization and device simulation. Through a multitarget optimization process, we effectively distinguish between triplet‐polaron quenching (TPQ) and triplet‐triplet annihilation (TTA).
46‐4: A Novel Method for Evaluating Short‐Range Uniformity of Micro‐LED Display
Authors: Zhai Yingteng , Hu Yuqi , Li Xi , Hao Zhiyang , Lyu Bojia
Published: June 2024

We proposed a novel method for evaluating short range uniformity. It was used to compare the performance of the micro‐LED display which was driven by PAM method and PAM+PWM hybrid method respectively. The results showed that the PAM+PWM hybrid driving method had significant performance advantages, which corresponded to the subjective visual feeling.
47‐2: Ultrafine‐pitch AlGaN Ultraviolet‐C microLED Displays for Quantum Dots Color Conversion
Authors: Feng Feng , Sheng Yujia , Liu Yibo , Li Zichun , Liu Zhaoyong , He Jr-Hau , Liu Zhaojun , Kwok Hoi-Sing
Published: June 2024

Aluminum Gallium Nitride (AlGaN) ultraviolet‐C (UV‐C) micro‐light‐emitting diodes (microLEDs) offer significant advantages in terms of convenience, cost‐effectiveness, and environmental friendliness, positioning them as promising candidates for display applications. However, achieving the desired high efficiency and scalability for large displays with ultra‐fine pixels necessitates substantial progress beyond current experimental outcomes. This study showcases the application of AlGaN UV‐C microLED display panels and micro‐displays incorporating quantum dots (QDs) for color conversion. Sidewall treatment and atomic layer deposited (ALD) passivation effectively address dangling bonds and etching damages, leading to a notable enhancement of TM‐polarized light extraction efficiency (LEE). Moreover, dedicated strain modulation efforts successfully reduce the high Al content (over 50%) wafer bowling effect, facilitating the modularization of ultrafine‐pitch AlGaN UV‐C microLED panels. Consequently, the devices achieve a peak performance of over 5% external quantum efficiency (EQE) as the mesa size scales down to 3 μm. The highlighted 0.18‐inch UV‐C microLED display panels, featuring a 9 μm pixel size, are precisely controlled by a CMOS IC driver to achieve desired patterns. Serving as an efficient pumping source for perovskite quantum dots paper (PQDP), this UV‐C microLED display suggests the potential to revolutionize the full‐color display industry by providing an innovative and unconventional solution.
49‐1: Invited Paper: “Optical Clone” Holographic Three‐dimensional Video‐rate Display
Authors: Gao Hongyue , Liu Jicheng , Fu Xinge , Hu Jinxuan , Zhu Hailei , Xu Yaguang , Liu Huimin , Chen Chengwei , Yang Ding , Chen Yanni , Zhou Yucong , Wang Xinglin , Guo Yiren , Shen Ziyi
Published: June 2024

“Optical clone” represents an advanced conceptualization of traditional holography, transcending the dichotomy between reality and virtuality by replicating authentic three‐dimensional optical images for display purposes. Holographic true threedimensional display technology is thus acknowledged globally as a pinnacle future display modality. The systems demonstrated in this paper are flat‐panel "optical clone" holographic true threedimensional display and the space floating holographic threedimensional display system, which surmounted the significant challenge of substituting dual‐beam coupling with single‐beam direct writing in hologram inscription systems, paving the way for compatibility with existing two‐dimensional display technologies.
49‐3: Large Glasses‐free 3D Display Based on LED Screen and Parallax Barrier
Authors: Zheng Changxiong , Surman Philip Anthony , Chen Ningtong , Xie Yue , Sun Xiao Wei
Published: June 2024

We are investigating the use of LED panels for ultra‐large glasse‐free 3D applications. For the first stage of our work, parallax barriers are used as these provide a lightweight and inexpensive view‐directing component for a multiview display; ultimately, these will be replaced by lenticular screens as these have a much greater light throughput. This work addresses the two major potential problems with the approach, namely; LED panel positional accuracy, and the effect of the high crosstalk levels encountered when providing sufficient luminance for outdoor environments. In this paper we will describe the mapping of the images and report on the use of 3D illusions to enhance the limited depth of field (DOF) provided by this first version of our display.
50‐3: A New Driving Solution for the Problem of Abnormal Display during Panel Power on
Authors: Chen Weifeng
Published: June 2024

This paper proposes a new driving solution which adds a skew detection module under the original architecture of source driver to solve the phase skew caused by TCON or SOC instability in the initial state during panel power on, causing the source driver to lock this phase skew and possibly generate the lock signal, thereby causing the source driver to re‐lock and resulting in abnormal display. It can be proven that this driving solution can effectively solve the problems, while ensuring that the skew of different transmission differential pairs is within ± 0.5UI, to avoid the occurrence of abnormal display.
52‐1: Invited Paper: Synergistic effect of IGZO in UV2A for next generation of UV2A mode
Authors: Guo Yuanhui , Xiao Junying , Qin Wei , Zhang Tianfeng , Zhang Xiuqin , Zhou Jing , Lei Liu , Cong Zhang , Qu Yingying , Cheng Dongchuan , Toshifumi Yagi
Published: June 2024

After decades of development, VA mode has shown excellent performance, but compared with ADS mode, it still has shortcomings in some specific fields. In the next generation of UV2A model, we adopted the technology of IGZO in UV2A. This article focuses on the current problems in the fields of small‐size TVs, extra‐large‐size TVs, and 8K TVs, and how to use this technology to optimize them.
52‐4: Research on the Process of Single Polarizer Reflective LCD
Authors: Liu Tao , Shen Jiajun , Zhang Xiang , Jiang Jun , Zheng Huilong , Liao Peter , Chung Smart
Published: June 2024

This paper proposes a reflective liquid crystal display solution, where an OC bump diffuse reflection layer is fabricated on the TFT side. By optimizing the OC bump height difference and pitch process parameters, and combining with a polarizer incorporating a quarter‐wave retardation film, a reflective liquid crystal display panel with high reflectivity and wide viewing angle is achieved.
53‐1: Invited Paper: Research on Adhesion of Acrylic Photoresist on Different Substrates for OLED Display
Authors: Shen Ying , Xiao Weikang , Li Chenzhe , Zhu Xiujian
Published: June 2024

Acrylic photoresist could be applied as a functional layer for OLED display, and it is required to be fabricated mainly on the hybrid substrate of metal and inorganic silicide substrate or the polymer substrate. Through simulation, this paper concludes that moderately increasing the silane coupling agent content and moderate crosslinking degree of the material system could contribute to improving the adhesion force at the interface between acrylic photoresist and substrate, thereby avoiding peeling. Four acrylic photoresists named OC1‐4 with different formula are introduced, their adhesion force and peeling performances on different substrates are researched. The experimental results are consistent with that of simulation. Among them, OC1&4 with high content of silane coupling agent did not exhibit peeling on the hybrid substrate and polymer substrate, and their adhesion forces are large enough, making them suitable as functional layers for OLED display.
56‐2: Four‐inch Wafer‐scale and Spherical Light‐emitting Diodes Based on Perovskite Quantum Wire Arrays
Authors: Ren Beitao , Zhang Daquan , Fan Zhiyong
Published: June 2024

Metal halide perovskite materials have been widely developed for next‐generation light‐emitting diodes (LEDs) because of their outstanding optoelectronic characteristics. However, it remains impediments to fabricate large‐scale or non‐planar devices by traditional solution methods. Herein, we introduce a close‐spaced vapor reaction method for uniformly growing perovskite quantum wire (QW) arrays in porous alumina membrane templates on unconventional substrates in air. The as‐grown MAPbBr3 QWs showcase a brilliant photoluminescence quantum yield of 92% and a photoluminescence lifetime of 5,644 hours in ambient air. Finally, four‐inch wafer‐scale and spherical LEDs have been successfully demonstrated, suggesting a promising fabrication approach for future large‐scale display and three‐dimensional lighting applications.
60‐1: Invited Paper: A Novel Inkjet Printing Device for 8K2K OLED MNT
Authors: Fan Minghung Hsu ZhaoKang , Peng Rui , Huang Wentong , Wang Huifeng , Shih Huaiting , Yu Jianwei
Published: June 2024

In this paper a hybrid tandem inkjet printing (IJP) OLED technology that combines printed RGB units with a common evaporative blue stack is proposed. The IJP OLEDs could achieve an overall white color efficiency up to 23.5cd/A with more balanced loads for RGB sub‐pixels. Thanks to the improved devices we demonstrate a 47.5" OLED MNT reaching the peak luminance of 580nits and up to 99% DCI‐P3 color gamut coverage.
60‐3: Functional Study of High‐Transparency Encapsulation Films Based on Inkjet Printing Technology
Authors: Yang C. Y. , Hong H. B. , Zhang D. L. , Fan H
Published: June 2024

Display devices are more and more widely used in mobile devices and wearable devices, which put forward higher lightweight requirements for display devices. The thin film encapsulation (TFE) technology for display panels has emerged. Through the combination of inorganic and organic films, the thin film encapsulation films can provide 10‐6 levels of water vapor barrier ability at the thickness of micrometers, helping the display devices to realize the dual role of lightweight and long lifetime. Organic encapsulation layers prepared by inkjet printing technique with acrylate composition and epoxy composition are commonly used materials in mass production process, which can effectively improve the barrier properties and softness of thin film encapsulation. However, to prepare organic encapsulation films in line with mass production process, it is necessary to achieve high light transmittance, high aging resistance, ultra‐fast curing rate, low volatile level and other functions. In this paper, from the materials perspective of inkjet printing ink, weâ€™ve studied how to realize the multifunctionality of organic encapsulation films through the combination of ink components and the configuration of functional groups, so as to provide reference for the downstream device preparation of organic encapsulation films.

By reducing the content of chromogenesis impurities, both acrylic and epoxy based films can achieve high light transmittance (see Fig.8) using inkjet printing film formation method, and the transmittance of visible light (400nm‐800nm) can reach more than 98%. Controlling curing degree above 95% can result in good aging performance (see Table 5&6), and a very low volatile level. (see Fig. 3).
61‐1: The Influence of Fringing Field Effect of Liquid Crystal on Silicon Devices with Different Liquid Crystal Thickness for Telecommunication Applications
Authors: Gao Quan , Li Kun , Zhao Xianyu , Wang Yuntao
Published: June 2024

The relationship among the liquid crystal thickness, fringing field effect and diffractive efficiency of the Liquid Crystal on Silicon (LCoS) device is studied in this paper, by measuring two prepared LCoS devices working at 1550nm with liquid crystal thickness of 5µm and 7µm respectively. The width of the fly back region of the LCoS devices was measured under microscopy to characterize the effect of the fringing field effect. The results demonstrated that in most cases, the smaller the thickness of the liquid crystal layer, the narrower the fly back region, and the higher the diffractive efficiency, but the direction of the grating may also affect the width of the fly back region to a certain extent.
61‐3: Generation and Optimization of Flat‐top Beams on Phase‐only Liquid Crystal on Silicon
Authors: Wang Yuntao , Li Kun
Published: June 2024

Flat‐top light is widely used in laser processing, and a variety of flat‐top beam shaping schemes have been proposed. Flat‐top beam shaping using Liquid Crystal on Silicon (LCoS) can generate flat‐top beam with different diameters without changing the experimental setup. The influence of the fringing field effect and beam utilization range of LCoS on the shaping process is analyzed. A hologram optimization scheme is designed, and onedimensional flat‐top beam with different diameters is generated in simulation and experiment.
62‐1: Invited Paper: TurboLED: Smart Display Design
Authors: Levermore Peter , Zeder Simon , Bluelle Balthasar , Stavrou Kleitos , Ruhstaller Beat , Monkman Andrew , Bradley Donal
Published: June 2024

We present a novel pixel design called TurboLED® for reducing display power consumption, as well as extending display lifetime and expanding color gamut. In a TurboLED® display, each pixel comprises stacked LEDs, with independent lighter and deeper red, green and blue emissive units. We demonstrate 48.0% power savings for a TurboLED® display with Rec. 2020 color gamut compared to an OLED display with a standard RGB pixel design. This substantial power savings can extend the daily battery life of smartphones, tablets, laptops and other portable electronic devices by several hours each day.
62‐3: The Effect of OLED Device Capacitance on Low Gray Levels Motion Blur
Authors: Zhao Xuesen , Zhang Xianping , Zhao Wei , Xu Jin , Wang Hongyu , Song Wonjun
Published: June 2024

In this study, we have demonstrated the phenomenon of motion blur in mobile phone during the process of application and analyzed the relevant factors that affect motion blur at low gray levels, including thin film transistor (TFT), organic light emitting diodes (OLED), and electronic code. Our findings indicated that the OLED capacitance has a more significant impact on phenomenon of motion blur than TFT and electronic code. Furthermore, we discovered that OLED capacitance is inversely proportional to the brightness of the first frame when switching from a black screen to white/red/green/blue screens. By adjusting holes accumulation at the OLED interface and the thickness of the common layer, it is possible to reduce OLED capacitance while improving objective value and subjective visual performance.
62‐4: A brightness compensation technology for OLED UDC Panel
Authors: Wang Yuqing , Zhu Xiujian , Ge Mingwei , Tan Xiaoping , Tang Tao
Published: June 2024

In order to achieve the perfect effect of the full AMOLED display, the research on the brightness compensation technology of UDC(Under‐Display Camera) panel is proposed. Linear interpolation is performed through attenuation at different temperatures to obtain temperature gain compensation values, which compensate for attenuation problems of the UDC area at different temperatures. Nonlinear regression model is established and predicted through attenuation at different DBV(Display Brightness Value) to obtain DBV gain compensation values, which compensate for attenuation problems of the UDC area at different DBV. Data statistics and algorithm compensation are performed by DDIC(Display Driver Integrated Circuit) to optimize and solve the color deviation of UDC panel, and the ultimate effect of the full screen is achieved.
65‐1: Invited Paper: The Advantages of “Clocked‐Analog” Video Transport in Source Driver ICs
Authors: Henzen Alex , Rockoff Todd , Clarke Rob , Hannebauer Rob
Published: June 2024

To emphasize the advantages of this method, HYPHY has developed an image and video quality measurement method that demonstrates the image quality of Modulated Analog to be at least on par with traditional display driving. Consumer demand for higher resolution, higher frame rate, and deeper color displays is driving the data rates of the connected video systems to the limits of affordability. At current high‐end displays, like 4K gaming at 360 Hz frame rate or 8K TV's at >120 Hz frame rate, conventional data transports require parallel data‐ pairs plus equalization circuits to deliver the required video data. These accommodations increase cost, power and complexity.

HYPHY's revolutionary ‘clocked‐analog’ video transport is the solution to this impasse, demonstrably delivering 10X more video payload per “wire‐hertz” than traditional methods, delivering equal or better image quality.

To emphasize the advantages of this method, HYPHY has developed an image and video quality measurement method that demonstrates the image quality of Modulated Analog to be at least on par with traditional display driving.
65‐4: A Novel GOA Circuit for Large‐size TFT‐LCD Display
Authors: Chen Yanling , Sun Haozhou , Li Wei , Song Yanjun , Dub Peng
Published: June 2024

In recent years, the gate driven on array (GOA) has become increasingly popular in the a‐Si TFT‐LCD industry. In this study, a new GOA circuit was designed by adjusting the ratio of inverter TFT size, and the operation principle of this new GOA circuit was studied in detail. The K/P point voltage in the GOA circuit was effectively optimized, which could avoid the sharp drop of GOA margin during the reliability testing at high temperature and high humidity (60°C/90%, HTHH). The new GOA circuit was used to drive 55” LCD panels that passed a 1500‐hour HTHH test, with only a 6 V loss in GOA margin compared to the original circuit's 13 V loss. This suggests an improvement in the life of GOA circuits in HTHH environments. This study provides a new route to enhance the GOA circuit properties of a‐Si large‐size TFT‐LCDs.
65‐5: Face Tracking and Recognition based on Projection Technology
Authors: Zhou Jiaqi , Fan Zhaowen , Zhang Xiong , Zhong Xuefei
Published: June 2024

Based on face tracking and recognition technologies, an intelligent gate system is proposed in this paper by combining projection display and camera. The system performs multiple people identity identification and projects different color patterns on each face according to the identification result, which can be observed by the identified people and securities in real‐time. The proposed system addresses the drawbacks of traditional verification gate systems with mechanical barriers such as mechanical failures, high costs, and low passage efficiency.
66‐2: Research on laser display technology and standards
Authors: Wu Chensi , Zhao HongLiang , Zhao Xiaoying , Sun Qifeng
Published: June 2024

With the development of ultra‐high‐definition displays and the Internet of Things, individuals' expectations for display technology have reached unprecedented heights. Laser displays have emerged as a crucial supporting technology among the various types of displays due to their unique benefits. This article delves into the three pillars of laser display technology: raw material processing, control systems, and terminal applications. It categorizes the vital technologies associated with laser displays into five distinct segments. Furthermore, a comprehensive laser display standard system is proposed based on the present state of laser display applications. This system encompasses general standards, vital technology standards, auxiliary control standards, detection and certification standards, and terminal application standards. Finally, the article highlights four critical areas for future laser display development, providing a roadmap for the continued advancement of this innovative display technology.
67‐2: Image Quality, Uniformity and Computation Improvement of Compressive Light Field Displays with U‐Net
Authors: Gao Chen , Li Haifeng , Liu Xu , Tan Xiaodi
Published: June 2024

We apply the U‐Net model for compressive light field synthesis. Compared to methods based on stacked CNN and iterative algorithms, this method offers better image quality, uniformity and less computation.
70‐2: Photoresist simulation about the sidewall angel of Microߚlens for OLED light extraction
Authors: Hu Liang , Cai Yu , Shen Peng , Yuan Yong
Published: June 2024

A numerical analytical method to quantify and predict the sidewall angle of photoresist was developed. The parameter which needed to simulation of this method can be obtained more conveniently different from previous complicated model. By this method, we can predict the sidewall angle of photoresist, design correct photomask and avoid lots of futility experiments.
71‐3: Investigating Driving Current and Environmental Conditions on Micro‐LED Performance Metrics
Authors: Zhang Liang , Zhang Runan , Li Xin , Zhao Lei , Ze Yuan
Published: June 2024

In this paper, we investigate the impact of driving current and environmental conditions on a commercially available 0.13‐inch InGaN‐based green‐colored Micro‐LED display with a resolution of 640 x 480 pixels. Through comprehensive testing, we aim to provide insights into the performance characteristics of Micro‐LEDs under various operational scenarios.
P‐1.2: Hot Carrier Effect in Self‐Aligned In‐Ga‐Zn‐Sn‐O High Mobility Thin Film Transisitors
Authors: Su Tongshang , Cheng Jun , Fang Jingang , Yan Liangchen , Yu Jianwei
Published: June 2024

Hot carrier (HC) effect of top gate (TG) and dual gate (DG) with high mobility oxide thin film transistors (TFTs) is investigated. It is found that TFTs with TG structure have a severer current degradation behavior than DG structure TFTs after HC stress. Relative small local vertical and lateral electric field near the drain junction induced by the DG TFTs, associated with higher mobility of DG TFTs are both employed to understand the different HC effect behavior. The negative threshold voltage (Vth) shift with decreasing channel length due to the short channel effect is also discussed.
P‐1.5: Influence of Bandgap of SiNx Gate Insulator on the Degradation Behavior of Amorphous Silicon Thin‐Film Transistors under Reliability Test
Authors: Zhou Xiaoliang , Li Hao , Qiao Lei , Wang Xu , Zhou Zhichao , Song Liwang , Liu Zhongjie , Tan Zhiwei
Published: June 2024

In this work, the stability of hydrogenated amorphous silicon (a‐Si:H) thin‐film transistors (TFTs) under reliability (RA) test was studied and a two‐stage degradation behavior during the RA test was first observed. The influence of bandgap (Eg) of the SiNx gate insulator (GI) on the degradation behavior was studied and the SiNx GI of a high Eg was found of vital importance due to its better blocking capability against electron injection from gate electrode into GI. The results in this work indicated technological impact for a‐Si:H TFTs in high‐brightness LCD products for outdoor display applications.
P‐1.8: High Performance Amorphous IZO/IGZO Bilayer Thin Film Transistors for Ink‐jet Printed AMOLED Displays
Authors: Liu Chenning , Hu Kai , Hsu Yuanjun , Liu Fangmei , Liu Zhaosong , Cao Weiran , Zhang Shengdong
Published: June 2024

High‐performance thin film transistors with a remarkable mobility of 38.7 cm2/Vs and excellent stability are demonstrated using amorphous indium zinc oxide (IZO)/indium gallium zinc oxide (IGZO) bilayer film as the active layer. The optimal performance of the bilayer device is found to be contingent upon the critical balance of oxygen flow ratio during sputtering IZO film. The mechanism governing the oxygen‐tuned performance has been thoroughly investigated. A 31‐inch ink‐jet printed AMOLED display panel has been successfully fabricated, with the GOA circuit integrated using this high mobility transistors. The good display performance showcases the significant application potential of the IZO/IGZO bilayer device.
P‐1.13: Electrical Performance of Side Wrapped Thin Film Transistor
Authors: Li Zhuang , Long Shiyu , Zhang Chunpeng , Ai Fei
Published: June 2024

With the miniaturization of thin film transistor (TFT), it exhibits severe short channel effect (SCE) including drain‐induced barrier lowering (DIBL). In this paper, the authors have manufactured a novel side wrapped TFT to enhance gate electrode's control over the channel and optimize the electric field distribution, which leads to stronger DIBL immunity.
P‐1.14: Effects of Active Layer Thickness on Performance of InZnO Transistors
Authors: Shi Jianbing , Li Qi , Xie Jingye , Xiong Longhai , Sun Chuanli , Dong Junchen , Han Dedong , Zhang Xing
Published: June 2024

Oxide transistors attract much attention in fields of displays and low‐cost integrated circuits (ICs). In the present work, IZO transistors were fabricated and the effects of active layer thickness on electrical characteristics of IZO transistors were studied. The devices with IZO thickness of 10 nm show the best electrical characteristics with a high on/off current ratio of 3.4×10 8 , a large field‐effect mobility (μFE) of 11.88 cm 2 /Vs, a small subthreshold swing (SS) of 178.10 mV/decade, and a reasonable turn‐on voltage (Von) of ‐0.3 V. It is demonstrated that IZO is a promising active layer material for future displays and IC applications.
P‐1.16: Study on influencing factors of low frequency display
Authors: Liang Haiyao , Wang Yang , Yang Xinlan , Peng Zhou , Wei Zhan , Chen Xi , Wang Shijun , Wang Jiguo , Liu Yi , Tai Yuke , Qi Shengmei , Qiu Zhangjie , Chen Gongda , Ding Tengfei , Zhang Shengfeng , Yu Tianjing
Published: June 2024

There are many factors affecting the low frequency display. Analyzing and classifying these factors, these factors are classified into three categories, one is electrical factors, one is material factors, and one is the realization of low frequency signals. Among them, electrical factors mainly include TFT leakage, pixel capacitance and capacitance between gate and pixel. Material factors mainly include liquid crystal, PI, VHR of liquid crystal and PI, and impedance matching of liquid crystal and PI, which have an important impact on the low frequency. The realization of low frequency mainly includes plugging porch or adjusting TCON control signal. Through the study of these influencing factors, the purpose of low‐frequency display can be effectively achieved through the control of these influencing factors. Meanwhile, in the process of low‐frequency research, the main factors affecting the Panel's low frequency can be judged through the test data, and targeted improvements can be made to achieve twice the result with half the effort.
P‐2.2: Research on a Method for Optimizing Flicker of AMOLED Display Screen
Authors: Yongbin Yang , Zheng Wang , Lijun He , Yong Li , Yong Wu , Xiaoyu Gao , Xiujian Zhu , Junfeng Li
Published: June 2024

In this paper, Display Driver Integrated Circuit (DDIC) is used as one adjustment platform. By adjusting output waveform of timing signal, we make each black inserting cycle in each frame of current through LIGHT‐emitting diode is consistent. Furthermore, this method can ensure the consistency of panel brightness, which also can reduce flicker phenomenon. Besides, through data segmentation and adaptive proportion fine‐tuning, the whole picture quality could be great improved. We think this method has helpful value to solve flicker problem, also has broad application prospect.
P‐3.5: Research on Reducing Moiré Patterns in Naked‐eye 3D Displays through Optimizing Lenticular Lens Tilt Angle
Authors: Gao Yuan , Li Pengfei , Gong Fan , Zhai Sihong , Wang Chaohao , Zhao Lei
Published: June 2024

In the domain of Naked‐eye 3D display technology, the periodic interference between lenticular lens and screen subpixels frequently results in the generation of moiré patterns, which significantly impair image quality. This study proposes a strategy to reduce moir é artifacts by adjusting the tilt angle of the lenticular lens. Relying on the human eye sensitivity function, we have conducted a thorough analysis of the moiré patterns caused by the interference between the lenticular lens and the screen at various tilt angles. After extensive research, it has been discovered that the analytical method which applies spectral sensitivity weighting subsequent to the consideration of the human eye sensitivity function aligns more closely with the actual perception of moiré patterns by the human eye. This approach enables a more precise determination of the optimal tilt angles for lenticular lenses and screens, thereby substantially minimizing the moiré effect. The implications of this finding are significant for the realization of high‐quality, high‐definition naked‐eye 3D image displays, and may positively contribute to advancements within this technical field.
P‐3.9: The Influence of Parallax and Shape Type Factors on the Perception of AR Equipment in Dark Environment
Authors: Xia Huiqiang , Tu Yan , Wang Lili
Published: June 2024

In this paper, the influence of parallax and image shape type on stereo vision perception is quantitatively explored by using RDS stimuli based on AR equipment through subjective scoring. Results show that an angular parallax amplitude between 0.6° and 1.2° can bring the best stereo sense. When amplitude ranged between 0° and 1.2°, the best visual comfort and the fastest image fusion speed could be achieved.
P‐4.4: Research on Key Technologies for Psychological Relief Based on Virtual Reality Exposure Therapy
Authors: Wang Yanfei , Wang Lijun
Published: June 2024

In the context of China's rapid development and accelerated pace of life, people generally face increased pressure, leading to a sharp increase in psychological problems. More than half of the population is sub‐healthy, and patients with mental illness are also increasing year by year. Mental stress is a common cause of psychological and physiological disorders, triggering emergency stress states. Psychotherapy has been developing as an important intervention method, and psychological relief based on relaxation and stress reduction has gradually become a research hotspot. Behavioral therapy and cognitive therapy are common psychological treatments, while relaxation induction methods include breathing training, meditation, music, etc. Virtual reality technology is used in psychological research to improve therapeutic effects. Among them, virtual reality exposure therapy (VRET), which treats anxiety by creating virtual scenes, has attracted attention. And in virtual reality exposure therapy treatment, the patient's psychological state can be grasped by monitoring these physiological reactions. This article will discuss the key technologies for psychological decompression based on VRET, aiming to gain an in‐depth understanding of its principles, applications, etc.