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

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

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...

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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： 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...

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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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Automatic extraction of lip based on wavelet multi-scale transformation across lip map

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Journal of Information and Computational Science 2008年第2期5卷 529-536页

作者： Guan, Yepeng School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Displays and System Application Shanghai 200072 China

The effective automatic location and tracking of a person's lip has been proven to be very difficult in the field of computer vision. A lip segmentation approach is proposed based on wavelet multi-scale edge detection across lip map. The developed algorithm exploits the spatial interactions between neighboring pixels through wavelet multi-scale edge detection across the lip map. The algorithm produces better segmentation automatically without the need to determine an optimum threshold for each lip image. It has indicated the developed algorithm with superior performance by comparing with some existing lip segmentation algorithms.

关键词： Edge detection

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Highly efficient yellow OLED using phosphorescent and fluorescent dopants

Highly efficient yellow OLED using phosphorescent and fluore...

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作者： Wang, X.R. Tang, H. Ding, G.H. You, H. Ma, D.G. Tian, H. Sun, R.G. Key Laboratory of Advanced Displays and System Application Shanghai University Jiading Shanghai 201800 China Key Laboratory of Advanced Materials Institute of Fine Chemicals East China University of Science and Technology Shanghai 200237 China Changchun Institute of Applied Chemistry Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences Changchun Jilin 130022 China

ISBN: (纸本)9787561752289

The efficiencies of an organic light-emitting diode (OLED) using tris-(8-hydroxy-quinoline) aluminum (Alq3) as host and tetraphenylnapthacene (Rubrene) as yellow dopant were greatly increased by adding a small amount (0.3 wt% ) of a phosphorescent Ir compound Iridium(III)bis(3-(2-benzothiazolyl)-7-(diethylamino)-2H-l-benzopyran-2-onato- N′, C4) (acetyl acetonate) (Ir(C6)2(acac) )sensitizer. The device had a simple structure of indium tin oxide (ITO)/4, 4′, 4″- tris(N-(2-naphthyl)-N-phenyl-amino) triphenylamine (T-NATA) (40 nm)/N, N′-bis (1-naphthyl)-N, N′-diphenyl-l, l′-biphenyl4, 4′-diamine (NPB) (40 nm)/Alq3: Rubrene (0. 7 wt% ): Ir(C6) 2 (acac) (0.3 wt% ) (40 nm)/Alq3 (40 nm)/ LiF (1 nm)/ Al (120 nm), and the current efficiencies of this device keep a high value of 13.9 cd/A, even the luminance rising to 37 000 cd/m2. The Commission International d'Eclairage (CIE) coordinates x and y are 0.46, 0. 44 of yellow color. The high efficiency at the high luminance was proposed due to the phosphorescent Ir(C6)2(acac) can harvest the singlet and triplet excitons formed in Alq3 and then efficiently transfer to yellow dopant Rubrene.

关键词： Fluorescence

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Low Voltage Organic Light-emitting Devices with Step Barrier Layer

Low Voltage Organic Light-emitting Devices with Step Barrier...

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2007亚洲显示国际会议

The electron injection transportation in OLEDs were improved by using a Gaq layer between Alq （or Bphen） and TBADN as step *** the LUMO （Lowest Unoccupied Molecular Orbital） of Gaq （2.9 eV） lies in between that of Alq （3.1 eV） (or Bphen（3.0 eV）) and TBADN （2.8 eV）,step barrier from Alq （or BPhen） though Gaq to TBADN can be *** experimental results indicate that:The J-V characteristics of both the electron only and the complete devices show the increase of the current density in devices with step barrier compared with the devices without step barrier. For electron only devices,the driving voltage at the current density of 20 mA/cm were reduced from 7.9 V to 4.9 V for devices with Alq,and from 4.2 V to 3.1 V for devices with Bphen respectively owing to the introduce of step *** the complete devices,after Gaq step barrier was introduced,at 20 mA/cm,the driving voltage were reduced from 7 V to 5.8 V for devices with Alq and from 6.2 V to 5.1 V for devices with *** step barrier was introduced,the lumi- nance at 200 mA/cm were increased from 1 684 cd/m to 2736 cd/m for device with Alq,and from 1026 cd/m to 2466 cd/m for devices with BPhen *** phenomena were explained by using tunnel theory.

关键词： OLEDS Low Voltage Tunnel Theory

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