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Research on panoramic illumination imaging system based on SURF algorithm 18

Research on panoramic illumination imaging system based on S...

18th China International Forum on Solid State Lighting and 7th International Forum on Wide Bandgap Semiconductors, SSLChina: IFWS 2021

作者： Wang, Fei Ji, Xiaoxiao Yin, Luqiao Guo, Aiying Zhang, Jianhua Shanghai University School of Microelectronics Shanghai201800 China Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai200072 China School of Mechatronic Engineering and Automation Shanghai University Shanghai200072 China

ISBN: (纸本)9781665495462

Underwater lighting systems and imaging systems are mainly used in underwater pipeline internal inspection, underwater environment information collection, resource detection, etc. This article explores a panoramic lighting imaging system based on an underwater environment. Mainly from the intelligent lighting system, panoramic imaging system, and system integration optimization. The intelligent lighting system mainly explores a high-brightness intelligent lighting device with a high-brightness lighting system. The imaging system mainly works in conjunction with the lighting system. The imaging system mainly collects 250° panoramic picture information and 250° video information for scientific research and other tasks. Provide appropriate information and data. Finally, system integration optimization and joint work are carried out. © 2021 IEEE.

关键词： Imaging systems

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Design and Analysis of Cylindrical Liquid Lens Based on Electrowetting

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Guangxue Xuebao/Acta Optica Sinica 2025年第10期45卷

作者： Zhou, Le Ma, Xiangteng Zhao, Wenfeng Li, Xifeng Key Laboratory of Advanced Display and System Applications Ministry of Education School of Mechatronic Engineering and Automation Shanghai University Shanghai200072 China Kunshan Xuanrou Optoelectronics Technology Co. Ltd. Jiangsu Suzhou215300 China

Objective Cylindrical lenses, with their unique ability to focus light in a single dimension, are critical for applications such as beam shaping and improving illumination uniformity. However, most existing research on electrowetting-based liquid lenses focuses on spherical configurations, leaving cylindrical variants underexplored. These cylindrical lenses face challenges such as high driving voltages, limited focal ranges, and structural inefficiencies. In this paper, we address these challenges by proposing a novel cylindrical electrowetting liquid lens design featuring a conical cavity with segmented dielectric layers. Our approach aims to advance cylindrical liquid lens technology for compact optical systems, targeting low-voltage operation (35 ‒ 55 V), wide focal length tunability (139 ‒ 999 mm), and enhanced optical performance. We provide foundational insights for applications in laser processing, optical sensing, and medical imaging by bridging theoretical advancements with practical implementation. Methods We employ a multidisciplinary approach combining theoretical analysis, numerical simulations, and experimental validation. The lens structure incorporates a conical cavity with alternating thick (15 µm) and thin (3 µm) dielectric layers [Fig. 1(d)], enabling asymmetric liquid interface control based on the Young-Lippmann equation (Eq. 1). Theoretical modeling establishes the relationship between applied voltage and interface curvature, while a fifth-degree polynomial (Eq. 2) ensures high-precision fitting of simulated interface profiles (R2>0.98, Table 1). COMSOL Multiphysics 6.0 simulates voltage-dependent interface deformations (Fig. 2), and Zemax evaluates optical performance, including focal length, aberrations, and field curvature (Figs. 6 and 7). Fabrication involves photolithography and parylene-C deposition to create dielectric layers (Fig. 8), followed by experimental testing using a laser-CCD setup to measure focal length indirectly via spot wi

关键词： Fiber optic sensors

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Simulation Study on Electrothermal and Mechanical Coupling of Bumps in 5×5 Micro-LED Array 20

Simulation Study on Electrothermal and Mechanical Coupling o...

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20th China International Forum on Solid State Lighting and 9th International Forum on Wide Bandgap Semiconductors, SSLCHINA: IFWS 2023

作者： Yang, Zhu Fu, Hao Wang, Kefeng Ji, Xiaoxiao Chen, Liang Yin, Luqiao Lu, Xiuzhen Zhang, Jianhua School of Microelectronics Shanghai University Shanghai201800 China Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai2000072 China School of Mechatronic Engineering and Automation Shanghai University Shanghai2000072 China

ISBN: (纸本)9798350385373

As a frontier research field of next-generation display technology, Micro-LED technology has the advantages of high brightness, high contrast and high energy efficiency. With the development trend of high-power, multi-array LEDs, the research on thermal stability of LEDs is gradually deepened. In order to explore the thermal stability of bumps during the working of Micro-LED, COMSOL Multiphysics simulation software and finite element method were used to analyze the electrothermal and mechanical coupling of bumps in 5×5 Micro-LED array in this paper. Flip-chip bonding was employed for interconnection of Micro-LED array and Si driver chip with the gap except Micro-LED devices between sapphire and silicon substrate filled with underfill to alleviate the stress concentration. The effects of different filling materials, applied current densities, and dimensions of In bumps (cylindrical) on thermal stress and displacement of the Micro-LED array were analyzed in detail. The results show the stress and displacement of the bumps with polyimide (PI) underfill were the smallest than that of bumps with benzocyclobutene (BCB) and epoxy resin (EP) underfill. Additionally, the temperature, thermal stress, and displacement of the bumps were also affected by the applied current density and the size of the bumps. © 2023 IEEE.

关键词： Light emitting diodes

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Multi-Dimensional Linear Scanning Algorithm for Silicon-based Micro-OLED 17

Multi-Dimensional Linear Scanning Algorithm for Silicon-base...

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17th China International Forum on Solid State Lighting and 2020 International Forum on Wide Bandgap Semiconductors China, SSLChina: IFWS 2020

作者： Zhou, Houda Guo, Aiying Wang, Fei Zhang, Jianhua Shanghai University Ministry of Education Key Laboratory of Advanced Display and System Applications Shanghai200072 China School of Mechanical Engineering and Automation Shanghai University Shanghai200072 China School of Microelectronics Shanghai University Shanghai200072 China

ISBN: (数字)9780738111889

ISBN: (纸本)9780738111889

With the continuous development of display devices and technologies, as a new type of display device, silicon-based Micro-OLED has become a new type of display device in the fields of augmented reality, virtual reality, etc. due to its high brightness, self-luminous, low power consumption, and rich color display. In this paper, the research on the driving scanning algorithm of silicon-based Micro-OLED is carried out. Based on the linearity of the traditional PWM scanning algorithm, the sensitivity parameters of the human eye at different gray levels are added to the randomized gray mapping function. The optimization search is carried out by the combination of degree mapping, and finally a multiple linear scanning algorithm suitable for high refresh rate and high gray level is proposed. Through experiments, the multivariate linear scanning algorithm proposed in this paper has higher linearity than the optimal scanning algorithm, and the scanning efficiency reaches 100%. It has the advantages of reducing the driving frequency and increasing the display frame rate. © 2020 IEEE.

关键词： Augmented reality

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Simulation study on thermal mechanical properties of 4×4 Micro-LED array in flip-chip bonding process 18

Simulation study on thermal mechanical properties of 4×4 Mi...

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18th China International Forum on Solid State Lighting and 7th International Forum on Wide Bandgap Semiconductors, SSLChina: IFWS 2021

作者： Ji, Xiaoxiao Wang, Fei Yin, Luqiao Zhang, Jianhua Shanghai University Ministry of Education Key Laboratory of Advanced Display and System Applications Shanghai200072 China School of Mechatronic Engineering and Automation Shanghai University Shanghai200072 China School of Microelectronics Shanghai University Shanghai201800 China

ISBN: (纸本)9781665495462

With the advent of the Micro-light-emitting diodes, it has become the focus of display and visible light communication research. However, as the LED chip size shrinks, the difficulty of integration increase gradually. Nowadays, the integration of Micro- LEDs in display is still a challenge for commercialization. In this work, we conducted a comparative study by finite element method simulation to reveal the influencing factors of bonding yield. The results show that stress concentrates at the junction of the bumps and electrodes of Micro-LED chips, and the stress concentration at the corner of Micro-LED array is more seriously. By altering the parameters of bumps, such as shapes and materials to reduce the stress and stress concentration. Numerical simulate results provide theoretical basis for reducing stress and stress concentration and optimizing the bump shape. © 2021 IEEE.

关键词： Light emitting diodes

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Fabrication and Study of Micro-LED Quantum Dot Color Conversion Layer Based on Inkjet Printing 20

Fabrication and Study of Micro-LED Quantum Dot Color Convers...

引用

20th China International Forum on Solid State Lighting and 9th International Forum on Wide Bandgap Semiconductors, SSLCHINA: IFWS 2023

作者： Wang, Xinyi Zhou, Haojie Ji, Xiaoxiao Yin, Luqiao Zhang, Jianhua School of Microelectronics Shanghai University Shanghai200444 China Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai200072 China School of Materials Science and Engineering Shanghai University Shanghai200072 China

ISBN: (纸本)9798350385373

In this study, red and green quantum dot color conversion layer was successfully fabricated using inkjet printing (IJP) technology on a blue micro-light-emitting diode (Micro-LED) backlight. To reduce the optical crosstalk between different sub-pixels, a black matrix (BM) layer with a thickness of 15 μm was proposed. Furthermore, to protect quantum dots (QDs), a SiO2 passivation layer with a thickness of 3 nm was uniformly deposited on the entire pattern by Atomic Layer Deposition (ALD). Subsequently, a pixel array featuring a sub-pixel size of 37.5 μm and a line width of 2 μm was fabricated on the BM layer treated with Reactive Ion Etching (RIE), and the thickness of the QDCC layer was controlled by RIE. The external quantum efficiencies of the red and green QDCC layer were 12.9% and 18.2%, respectively, and the emission spectra had blue light being transmitted, accompanied by a slight redshift. This research addresses the gaps in display applications and holds promise for the future advancement of Micro-LED display technology. © 2023 IEEE.

关键词： Atomic layer deposition

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基于低浓度掺杂TTF-HLCT一体化分子提供的多重激子循环通道增强深蓝光OLED的稳定性

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Science China Materials 2024年第7期67卷 2161-2168页

作者：唐振宇龚乐帆郭浩清杨爽罗骏唐荣肖静张震曲波陈志坚肖立新 State Key Laboratory of Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China College of Physics and Electronic Engineering Taishan UniversityTaian 271000China Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai UniversityShanghai 200072China

目前,商用的深蓝有机发光二极管(OLED)使用的三重态-三重态融合(TTF)型发光材料只能捕获50%的三重态(T_(1))激子,导致其器件效率较低.基于窄带蓝色发射体的热激活延迟荧光(TADF)和超荧光策略可以实现接近100%的激子利用率,然而,在发射层... 详细信息

目前,商用的深蓝有机发光二极管(OLED)使用的三重态-三重态融合(TTF)型发光材料只能捕获50%的三重态(T_(1))激子,导致其器件效率较低.基于窄带蓝色发射体的热激活延迟荧光(TADF)和超荧光策略可以实现接近100%的激子利用率,然而,在发射层(EML)中停留的高能量T_(1)激子通常会导致不可避免的分子降解,从而限制了器件的使用寿命.为了解决这一问题,本文研究了一种TTF-杂化局域-电荷转移态(HLCT)一体化分子,旨在通过多个激子回收通道降低EML内T_(1)激子的密度,从而提高高效深蓝OLED的稳定性.通过TTF过程回收T_(1)激子,通过HLCT过程利用高能三重态(Tn)激子,可以提高EML中三重态激子的利用率.此外,低浓度掺杂的TTF-HLCT分子在TADF体系中可以减轻T_(1)激子猝灭造成的效率损失.最后,实现了外量子效率(EQE)为25.9%、CIE为(0.131,0.050)、蓝光指数(CE由CIEy校准)为312 cd A^(−1) CIE_(y)^(−1)的顶发射OLED,并且其寿命T90@1000 cd m^(−2)从0.5小时延长到6.1小时.本工作揭示了低浓度TTF-HLCT分子掺杂的潜力,作为一种可行的解决方案,可以最大限度地减少效率猝灭,并解决蓝光OLED的稳定性问题.

关键词： organic light-emitting diode stability multiple ex-citon recycling channels deep blue emission TTF-HLCT

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A new color transformation based fast outer lip contour extraction

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Journal of Information and Computational Science 2012年第9期9卷 2505-2514页

作者： Pan, Jing Guan, Yepeng Wang, Shuangcheng School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education China

Various methods for lip segmentation have been proposed, it still remains a challenging and difficult problem due to high variability of lip color and low chromatic contrast between the lip and skin. A novel automatic lip segmentation algorithm is proposed based on a novel color transformation in RGB space instead of complex color models. Comparative study with some existing lip segmentation algorithms has indicated the superior performance of the developed algorithm. The proposed algorithm produces better segmentation fast and efficiently. © 2012 Binary Information Press.

关键词： Curve fitting

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Light Field Reconstruction in Angular Domain with Multi-Models Fusion Through Representation Alternate Convolution

SSRN

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SSRN 2022年

作者： Cao, Fengyin Huang, Xinpeng An, Ping Yang, Chao Shanghai Institute for Advanced Communication and Data Science School of Communication and Information Engineering Shanghai University Shanghai200444 China Key Laboratory for Advanced Display and System Application Ministry of Education Shanghai200072 China

To alleviate the spatial-angular trade-off in light fields (LFs), LF super-resolution (SR) has been studied. Most of current methods only concern limited relations in LFs, which leads to the insufficient exploitation of the multi-dimensional information. To address this issue, we present a multi-models framework for LFSR in this paper. Models which embody LF from distinct aspects are integrated to constitute the framework. Therefore, the number and the arrangement of these models and the depth of each model determine the framework’s performance, we make the comprehensive analysis on these factors to reach the best result. However, models in the framework are isolated to each other as the unique inputs are required. To tackle this issue, the representation alternate convolution (RAC) is introduced. As the fusion is conducted through the RAC, the multi-dimensional information in LFs is fully exploited. Experimental results demonstrate that our method achieves superior performance against state-of-the-arts techniques. © 2022, The Authors. All rights reserved.

关键词： Convolution

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Low-drive-voltage OLEDs with a Novel Cohost Electron Transport Layer

Low-drive-voltage OLEDs with a Novel Cohost Electron Transpo...

引用

2007亚洲显示国际会议

作者： M.A.Khan Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai 200072 China Department of Materials Science Shanghai University Jiading Campus Shanghai 201800 China

We demonstrated efficient electron injection and transport in organic light-emitting diodes using an electron-transport layer composed of 4,7-diphenyl-1,10-phenanthroline (BPhen) with 8-hydroxy-quinolinato lithium (Liq) co-deposited *** on cohost strategy,a low-voltage driving of OLEDs with the structure of [ITO/m-MTDATA/NPB/Alq/Liq (33%):Bphen/LiF/A1] has been *** is found that the power efficiency is enhanced by～20% while driving voltage is reduced by～15% as compared to the control *** this strategy with the judicial doping concentra- tion of Liq greatly increases the electron conductivity in ETL,leading to the lowering the operating voltage and enhancing the power efficiency of the OLEDs.

关键词： Organic Light Emitting Diodes Electron Injection and Transport Low-voltage Driving

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