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Efficient and stable white organic light-emitting device with dual emission layer consisting of cohost system

Guangdianzi Jiguang/Journal of Optoelectronics Laser 2010年第6期21卷 825-828页

作者： Wang, Qiang Zhu, Wen-Qing Xu, Xiao-Ming Zhang, Xiao-Wen Cao, Jin Jiang, Xue-Yin Zhang, Zhi-Lin School of Material Science and Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications EMC Shanghai University Shanghai 200072 China

An efficient and stable white organic light-emitting device(OLED) with dual emission layer consisting of cohost system is demonstrated. The blue-emitting layer is composed of fluorescent dye DSA-Ph doped into single host TBADN (TBADN: 3 wt% DSA-Ph) while the red-emitting layer is fluorescent dye DCJTB doped into cohost system consisting of TBADN and Alq3 ([TBADN: Alq3]: 1wt% DCJTB). The device luminous efficiency and CIE color coordinates could be adjusted by altering the ratio of TBADN to Alq3 in the red-emitting layer. An efficient and stable white OLED with excellent color coordinates is achieved when an optimized ratio (75:25) of TBADN to Alq3 is used. The maximum luminous efficiency reaches 6. 27 cd/A with CIE color coordinate of (0. 364, 0. 348) at the current density of 20 mA/cm2. When the current density increases to 200 mA/cm2, the device luminous efficiency still remains at 6. 15 cd/A with CIE color coordinate of (0. 344, 0. 344). The improved performance of the white OLED is mainly attributed to the ambipolar property of TBADN, which results in the improvement of carrier balance and distribution in the emission layer.

关键词： Current density

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Anisotropic thermal conductivity in electrically conductive adhesives with single- and bimodal filler-size distributions containing Ag flakes and micro-particles

Anisotropic thermal conductivity in electrically conductive ...

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3rd Electronics system Integration Technology Conference, ESTC 2010

作者： Inoue, Masahiro Muta, Hiroaki Yamanaka, Shinsuke Liu, Johan The Institute of Scientific and Indistrial Research Osaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan Division of Sustainable Energy and Environmental Engineering Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan Department of Microtechnology and Nanoscience Chalmers University of Technology Kemivägen 9 SE-412 96 Göteborg Sweden Key Laboratory of Advanced Display and System Applications SMIT Center Shanghai University Box 282 No. 149 Yan Chang Road Shanghai 200072 China

ISBN: (纸本)9781424485536

Adhesives containing Ag flakes and spherical micro-particles were prepared. The variations in their electrical and thermal conductivities with matrix chemistry and curing temperature were investigated. Due to the alignment of Ag flakes along the in-plane direction, the adhesives containing only Ag flakes provided maximum thermal conductivity in this direction. Introduction of Ag spherical micro-particles effectively improved the thermal conductivity in the vertical direction for the bi- and single-modal adhesives. The adhesives containing only micro-particles are expected to be most effective from the viewpoint of the number of interfaces. However, the filler size distributions that provide maximum thermal conductivity in the vertical direction alter depending on the matrix chemistry and curing temperature due to variation in the interfacial thermal resistance between fillers.

关键词： Adhesives

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Warpage simulation for LCD interconnected by NCF

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Cailiao Kexue yu Gongyi/Material Science and Technology 2010年第6期18卷 857-861页

作者： Zhang, Jian-Hua Yuan, Fang Zhang, Jin-Song Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University Shanghai 200072 China College of Mechatronics Engineering and Automation Shanghai University Shanghai 200072 China

To study the reliability of the Chip-on-Glass (COG) module interconnected by Non-Conductive-Adhesive (NCF), this paper applied finite element method (FEM) to simulate the fields of temperature and stress in COG. A 3D model of the COG module had been established and a sequence coupled field had been done to calculate the warpage and inner stress. In the thermalcompression bonding stage, the thermal process was a steady state, which produced a low temperature difference in the COG module, while the NCF absorbed and relaxed the thermal stress and strain to weaken warpage. In the cooling stage, the process was non-steady and a significant temperature difference between the interfaces of bump/NCF and NCF/substrate was induced at the beginning. This generated a high thermal stress difference to yield a large warpage. The residual stress and warpage were proportional to the decrease of the mechanical loading in the thermal compression bonding stage and the temperature difference in the cooling stage.

关键词： Glass

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Motion attention based frame-level bit allocation scheme for H.264 09

Motion attention based frame-level bit allocation scheme for...

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1st International Conference on Internet Multimedia Computing and Service, ICIMCS 2009

作者： Shen, Liquan Liu, Zhi Zhang, Zhaoyang Yan, Hongbo Key Lab. of Advanced Display and System Application Ministry of Education Shanghai University China

ISBN: (纸本)9781605588407

Rate control plays a major role in video coding and multimedia streaming. A well-designed rate control scheme should pursue both the objective quality and subjective quality. However, existing H.264 rate control algorithms mainly aim at improving the objective quality without consideration the perception of human view system (HVS). In this paper, we propose a novel rate control algorithm based on local motion attention. The bits allocated to each frame are proportional to the local motion activity in it, and more bits are allocated to the frame with strong local motion attention. Experiment results show that our method not only enhances the coding quality in the frames with strong local motion attention but also reduces the temporal PSNR fluctuation across frames up to 22.15%. Copyright 2009 ACM.

关键词： Image coding

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Color correction method based on histogram segmentation for multiview video

Color correction method based on histogram segmentation for ...

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Institution of Engineering and Technology International Communication Conference on Wireless Mobile and Computing

作者： Liu, Yi Wang, Yongfang Zhang, Zhaoyang School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai 200072 China

ISBN: (纸本)9781849191388

Color differences between different views can cause performance degradation in multiview video coding. In order to overcome this problem, in this paper a local color correction method based on histogram segmentation is proposed. In the proposed method, we correct the color changes in the different segmentation regions between the current picture and the reference picture. Extensive experimental results demonstrate that the proposed method outperforms the traditional global linear color correction methods with objective mean of disparity values and subjective visual quality, and achieves better correction results.

关键词： Color

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Robust video foreground segmentation and face recognition

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Journal of Shanghai University(English Edition) 2009年第4期13卷 311-315页

作者：管业鹏 School of Communication and Information Engineering Shanghai University Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai University

Face recognition provides a natural visual interface for human computer interaction （HCI） applications. The process of face recognition, however, is inhibited by variations in the appearance of face images caused by changes in lighting, expression, viewpoint, aging and introduction of occlusion. Although various algorithms have been presented for face recognition, face recognition is still a very challenging topic. A novel approach of real time face recognition for HCI is proposed in the paper. In view of the limits of the popular approaches to foreground segmentation, wavelet multi-scale transform based background subtraction is developed to extract foreground objects. The optimal selection of the threshold is automatically determined, which does not require any complex supervised training or manual experimental calibration. A robust real time face recognition algorithm is presented, which combines the projection matrixes without iteration and kernel Fisher discriminant analysis （KFDA） to overcome some difficulties existing in the real face recognition. Superior performance of the proposed algorithm is demonstrated by comparing with other algorithms through experiments. The proposed algorithm can also be applied to the video image sequences of natural HCI.

关键词： face recognition human computer interaction （HCI） foreground segmentation face detection threshold

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EXPERIMENTAL STUDY ON THE VORTEX FORMATION AND ENTRAINMENT CHARACTERISTICS FOR A ROUND TRANSVERSE JET IN SHALLOW WATER

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Journal of Hydrodynamics 2009年第3期21卷 386-393页

作者： FAN Jing-yu ZHANG Yan WANG Dao-zeng Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications Ministry of Education and SMIT Center School of Mechatronics Engineering and Automation Shanghai University Shanghai 200072 China

The vortex formation and entrainment characteristics for a round transverse jet in shallow water were experimentally investigated by means of a combination of LIF flow visualization and PIV measurement. A scarf vortex wrapped around the main body of the jet is formed in the near-wall region due to the interaction between the resulting wall jet and sufficiently shallow crossflow, with some more or less unsteady flow properties and with spreading ranges as functions of both the velocity ratio and the water depth within the near field. The entrainment of the ambient crossflow fluid into the jet main body is closely associated with the time-evolving features of the shear layer between the jet and surrounding fluid as well as the induced vortical structures near the wall. In the case of slight impingement upon the wall, the interaction between the jet shear layer and the weak, unstable scarf vortex gives rise to an appreciable local entrainment enhancement, confined in the near-wall region in the vicinity of the stagnation point. While in the case of intense impingement upon the wall, the well-organized and stable scarf vortex gives rise to a greatly enhanced entrainment and a greatly increased lateral spreading rate nearly throughout the overall near field as compared to the conventional wall jet. In addition, the entrainment of the ambient crossflow fluid by the scarf vortex in this case occurs largely on the surface of the unique spiral roller structure by itself due to the presence of smaller and unorganized eddies, and accordingly the scarf vortex is likely to keep its spiral roller structure steadily to a relatively great downstream distance within the near field.

关键词： transverse jet shallow water vortex formation entrainment PIV measurement

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Efficient VLSI architecture of CAVLC decoder with power optimized

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Journal of Shanghai University(English Edition) 2009年第6期13卷 462-465页

作者：陈光化胡登基张金艺郑伟峰曾为民 Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai Key Laboratory of Power Station Automation Technology School of Mechatronics Engineering and Automation Shanghai University

This paper presents an efficient VLSI architecture of the contest-based adaptive variable length code （CAVLC） decoder with power optimized for the H.264/advanced video coding （AVC） standard. In the proposed design, according to the regularity of the codewords, the first one detector is used to solve the low efficiency and high power dissipation problem within the traditional method of table-searching. Considering the relevance of the data used in the process of runbefore＇s decoding, arithmetic operation is combined with finite state machine （FSM）, which achieves higher decoding efficiency. According to the CAVLC decoding flow, clock gating is employed in the module level and the register level respectively, which reduces 43% of the overall dynamic power dissipation. The proposed design can decode every syntax element in one clock cycle. When the proposed design is synthesized at the clock constraint of 100 MHz, the synthesis result shows that the design costs 11 300 gates under a 0.25 μm CMOS technology, which meets the demand of real time decoding in the H.264/AVC standard.

关键词： H.264/advanced video coding （AVC） contest-based adaptive variable length code （CAVLC） decoder

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Micropolar interface model of thin-layered interconnection components with heterogeneous internal microstructures

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Journal of Shanghai University(English Edition) 2009年第5期13卷 345-348页

作者：张燕樊靖郁 Key Laboratory of Advanced Display and System Applications School of Mechatronics Engineering and AutomationShanghai University Shanghai Institute of Applied Mathematics and Mechanics Shanghai University

Being a wide variety of thin-layered interconnection components in electronics packaging with relatively small scale and heterogeneous materials, conventional numerical methods may be time consuming and even inefficacious to obtain an accurate prediction for the interface behavior under mechanical and/or thermal loading. Rather than resort to a fully spatial discretization in the vicinity of this interface zone, an interface model was proposed within the framework of micropolar theory by introducing discontinuous approximation. A fracture description was used to represent the microscopic failure progress inside the interface. The micropolar interface model was then numerically implemented with the finite element method. As an application, the interface behavior of a packaging system with anisotropic conductive adhesive (ACA) joint was analyzed, demonstrating its applicability and great efficiency.

关键词： interface model micropolar theory discontinuous approximation

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A novel intermediate view synthesis method

A novel intermediate view synthesis method

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Institution of Engineering and Technology International Communication Conference on Wireless Mobile and Computing

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

ISBN: (纸本)9781849191388

The intermediate view synthesis from arbitrary view plays an important role in three dimensional television system and multi-video compression. In this paper, we present a new view synthesis method based on a modified support-weights computation in disparity estimation, which utilize the centralized color vector and phase information, then we propose a view synthesis method. The experimental results show that our method improves the quality of the synthesized intermediate image compared with the well-known viewpoint synthesis method.

关键词： Television systems

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