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Electronics Packaging Technology Conference (EPTC)

作者： Hu Chen Yi Li Zhao Hao Xingyang Wu Jianhua Zhang The Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai China Shanghai University Shanghai China

ISBN: (纸本)9781665416207

Organic conjugated polymers have been widely used in the field of X-ray detectors because of their simple processing, mechanical flexibility and low cost. In this paper, we report a vertical structure X-ray detector using PDMS material which is fabricated by simple process steps. The response of pure PDMS material to X-ray is verified, and the effects of different process conditions on the device performance were tested. The detector with film forming speed 2000 rpm and curing temperature 60°C still has high sensitivity $\left (434.5 \mu \mathrm{CGy}_{\text {air }}^{-1} \mathrm{~cm}^{-2}\right)$ to low dose rate $\left(23.9 \mu \mathrm{Gy}_{\text {air }}\text{S}^{-1}\right)$ when the applied bias voltage is 150 V. Finally, the device provides an idea for the development of low cost and high performance flexible direct X-ray detectors.

关键词： Performance evaluation Temperature sensors Micrometers X-ray detectors Sensitivity Costs Voltage

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3D multi-view stereoscopic display and its key technologies

3D multi-view stereoscopic display and its key technologies

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作者： Zhang, Zhaoyang An, Ping Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai 200072 China School of Communication and Information Engineering Shanghai University Shanghai 200072 China

ISBN: (纸本)9787561752289

As the next generation video display technique after 2D display based on DTV/HDTV, three-dimensional (3D) multi-view stereoscopic display has been one of the most popular research issues in the world. This paper provides an overview about the key technologies for building a multi-view stereoscopic display system, which includes: Light field representation model and light field capturing system, high efficiency multi-view coding and transmission method compatible with current video standard, high efficiency rendering method for arbitrary position view at the decoder, 3D display technologies and multi-view autostereoscopic display. Focusing on the key technologies above, the latest international development trends and existing problems is analyzed. Meanwhile a solution for implementing a 3D video processing system based on interactive auto-stereoscopic display is proposed.

关键词： Efficiency

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Image mosaic based view synthesis for interactive stereoscopic display

Image mosaic based view synthesis for interactive stereoscop...

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作者： An, Ping Zhang, Zhaoyang Liu, Suxing Liu, Zhanwei Guo, Giuyan Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai 200072 China School of Communication and Information Engineering Shanghai University Shanghai 200072 China

ISBN: (纸本)9787561752289

In stereoscopic display, view synthesis is a key technology to realize interactivity what is the ability to look around within a three dimensional (3D) scene by freely choosing a viewpoint. This paper presents an intermediate view synthesis algorithm , combining view interpolation with view morphing based on image mosaic. Firstly, the original stereo image pairs are normalized. Then, the disparity of only object area is estimated by a predict recursion method to improve the matching speed and accuracy. Afterward, credible areas in left and right views should be determined and chosen to create a transitional view. At last, a method combining view interpolation and morphing is used to synthesis the intermediate view from the transitional view. Experimental results show that the edge of created intermediate view object is clear and smooth, and the processing speed of view synthesis is obviously improved. This algorithm can be used in interactive stereoscopic display in varius 3D video application which an arbitrary view needs to be rendered in real-time.

关键词： Interpolation

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A plane-sweep based depth reconstruction for DIBR

A plane-sweep based depth reconstruction for DIBR

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作者： Liu, Suxing An, Ping Zhang, Zhaoyang School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai 200072 China

ISBN: (纸本)9787561752289

In this paper, a novel plane-sweep based depth reconstruction method for depth image-based rendering is presented. Unlike depth from stereo and image-based visual hull techniques, our method further develops the plane-sweeping algorithm, and extends it to synthesize "virtual" views of a real-world scene associated with depth information without any prior geometric information. When projecting the input images into the parallel "virtual depth planes" , a dynamic scoring method to compute the color consistency is introduced. In addition, for building a photorealistic "virtual" view, we present a view-direction based weighting strategy for depth image-based rendering. An important advantage of our approach is that due to more accurate depth information, better novel views can be acquired.

关键词： Stereo image processing

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Camera self-calibration from multi-view images

Camera self-calibration from multi-view images

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作者： Guo, Qiuyan An, Ping Zhang, Zhaoyang School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai 200072 China

ISBN: (纸本)9787561752289

Camera calibration is a key technology in computer field, in which self-calibration is to compute camera intrinsic parameters only from a series of images. The Kruppa's equations method not only needs to compute the fundamental matrix which includes all of the geometry relation between images, but also needs to compute the epipoles which variate with the different images. Hartley deduced a simple form of Kruppa's equations in terms of fundamental matrix. The goal of this paper is to convert the equations into the form of cost function according to the Hartley's deduction and calculate the cost function by the sum of fundamental matrixes multiplying the corresponding weighting factors that are related with the proportion of the number of matching features to the image pixels. In this paper, the genetic optimal algorithms are used to achieve the minimum value of the cost function. Our algorithm doesn't require computing the image epipole and avoiding the results instability, and is easy for the calculation. Experimental results show that the proposed algorithm is more effective and accurate, and can become a versatile tool for camera calibration, it will be used in our cameras array calibration.

关键词： Genetic algorithms

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Study on the degradation of sealed organic light-emitting diodes under constant current

Study on the degradation of sealed organic light-emitting di...

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International Conference on (ICEPT) Electronic Packaging Technology

作者： Xiao-Ming Xu Wen-Qing Zhu Qiang Wang Zhi-Lin Zhang Xue-Yin Jiang School of Material Science and Engineering Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai China

Degradation characteristics of sealed OLED devices under four different constant currents were investigated by using OLEDs aging tester. We found that the higher the applied current density was, the faster luminance decayed. There was a relationship between luminance and lifetime when the current density was within 200 mA/cm 2 . In addition, spectrum characterization indicated that the peak wavelength didn't shift during the aging process, which implied that the carriers recombination occurred near the NPB/Alq 3 interface all along even when OLEDs luminance dropped down to half of the initial value, indicating that the degradation wouldn't lead to the deviation of the carriers recombination region. Through the metallurgical microscopy observation, the number of bubbles and dark spots were noticed to increase continuously and the non-emissive area kept growing around the bubbles. It showed that bubbles would badly accelerate the formation of dark spots. By investigating luminance degradation under constant current, we draw a conclusion that OLEDs luminance degradation is not entirely coulombic. After introducing an acceleration coefficient, the formular could be applicable until the current went beyond some degree.

关键词： Thermal degradation Organic light emitting diodes Glass Aging Cathodes Indium tin oxide Flat panel displays Current density Acceleration Anodes

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Depth image based rendering

Depth image based rendering

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作者： Liu, Zhan-Wei An, Ping Zhang, Zhao-Yang School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai 200072 China

ISBN: (纸本)9787561752289

Image-Based Rendering (IBR) techniques, which have been considered to be an efficient way of generating novel views from a series of original views, have received much attention in recent ten years. Compared with other IBR techniques, Depth-Image-Based Rendering (DIBR) techniques need less reference images as the depth information is also used. As a key technology in advanced Three-Dimensional Television (3D-TV) system[5] , DIBR has a promising perspective. In this paper, a depth image based rendering system is proposed, different from the DIBR techniques used in advanced 3DTV, our method focus on generating an arbitrary new view instead of a virtual left view or right view. We first use an edge dependent filter to smooth the sharp changes in depth image so as to reduce the big holes. Then we do 3D Image Warping using the known calibration parameters. In order to deal with the visibility problem quickly, we process the pixels of the original images in an occlusion-compatible order [10]. Thirdly, we merge two generated images to eliminate the big holes in desired view. Finally we fill in the remaining holes with an interpolation method. Experimental results have show that the proposed method can provided a satisfactory image quality.

关键词： Three dimensional computer graphics

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Brief Review of Silver Sinter-bonding Processing for Packaging High-temperature Power Devices

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Chinese Journal of Electrical Engineering 2020年第3期6卷 25-34页

作者： Haidong Yan Peijie Liang Yunhui Mei Zhihong Feng School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin 541004China Guangxi Key Lab of Manufacturing System and Advanced Manufacturing Technology Guilin 541004China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Guilin 541004China National Key Lab of Application Specific Integrated Circuit Hebei Semiconductor Research InstituteShijiazhuang 050051China

Silver sintering is receiving increasing attention due to its novel die-attach technique for high-temperature power *** thermal conductivity,high melting point/remelting temperature and low-temperature sintering behaviors of the silver sintered attachment meet the requirements of high-temperature applications for power devices,specifically SiC *** merits and demerits of the existing pressure-assisted sintering and pressure-less sintering techniques using nano-scale,micro-scale and micro-nano-scale hybrid silver sintered materials are separately *** emerging rapid sintering approaches,such as the electric-assisted approach,are briefly introduced and the technical outlook is *** addition,the study highlights the importance of creating a brief resource guide on using the correct sintering methods.

关键词： Pressure-less sintering pressure-assisted nanosilver paste high-temperature power module insulated gate bipolar translators(IGBT) silicon carbide(SiC)

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High-Efficiency and Robust PhOLEDs Fabricated by Blade-Coated Planar Source Evaporation

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IEEE Transactions on Electron Devices 2025年

作者： Fo, Wan-Zhen Li, Jun Zhang, Zhi-Lin Wei, Bin Zhang, Qisheng Shanghai University School of Material Science and Engineering Jiading Shanghai 201800 China Shanghai University School of Material Science and Engineering School of Microelectronics Jiading Shanghai 201800 China Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai 200072 China Zhejiang Hongwu Technology Company Ltd Taizhou 317100 China

Planar source evaporation (PSE) is a promis-ing technology for fabricating organic light-emitting diodes(OLEDs) devices due to its high material utilization, low-temperature accessibility, and minimized shadow effect,which should have led to low-cost fabrication, efficientlight emission, and high resolution. However, PSE-OLEDshave been struggling with poor performance and stabilitydue to an unclear photoelectric mechanism caused bydistinct film formation with PSE. In this work, an inno-vative method of blade-coated PSE (BCPSE) is proposedto realize easily-accessible phosphorescent OLEDs withmicro-ternary doped emitting layer. Based on it, compre-hensive analysis on morphology, optoelectrical proper-ties, and carrier dynamics reveal the superior electricaland optical properties caused by distinct film forma-tion with PSE including better equilibrium of carriers,decreased nonradiative recombination loss, and reductionof exciton-polaron annihilation aroused by BCPSE, thusresulting in comparable efficiency and promoted half-lifetime (maximum current efficiency CE_max = 25.9 cd/A,T₅₀ = 54 306 h@100 cd/m²) compared to device producedwith vacuum thermal evaporation (VTE) (CE_max= 22.8 cd/A,T₅₀ = 17 149 h@100 cd/m²). BCPSE not only reducesfabrication cost but also improves device stability, posi-tioning it as a promising method for next-generation OLED applications. © 1963-2012 IEEE.

关键词： Blade-coated planar source evaporation (BCPSE) high-efficiency low-cost fabrication robust

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Subjective evaluation of light field images for quality assessment database 14th

Subjective evaluation of light field images for quality asse...

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14th International Forum of Digital TV and Wireless Multimedia Communication, IFTC 2017

作者： Shan, Liang An, Ping Liu, Deyang Ma, Ran Key Laboratory of Advanced Displays and System Application Shanghai Institute for Advanced Communication and Data Science Ministry of Education Shanghai University Shanghai200444 China School of Computer and Information Anqing Normal University Anqing246133 China

ISBN: (纸本)9789811081071

Light filed imaging is becoming popular for its diversity of post-processing and a wide range of applications. Various kinds of research about light field such as light field compression methods are coming out one after the other in recent years. For better evaluation of the quality of light field images and the performance of compression algorithm, the study on quality assessment of light field is in desperate need. In this paper, in order to establish a light field quality assessment database for the subsequent research, we propose a methodology of subjective evaluation for light field image and use a 2D objective evaluation method to verify the methodology. Results show that this methodology can be successfully used to assess the quality of light field content. © 2018, Springer Nature Singapore Pte Ltd.

关键词： Quality control

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