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16th International display Workshops, IDW '09

作者： Lu, Lin Zhang, Jianhua Wei, Bin Zhang, Hao Xu, Hongguang Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University 149 Yanchang Rd Shanghai 200072 China SVA Electron Co. Ltd. FPD Building 149 Yanchang Rd Shanghai 200072 China

We investigated the characteristics of red OLEDs with two donors and one dopant. The EL efficiency of novel device increased two folds compared to devices with single host materials while the peak emission kept unchan... 详细信息

关键词： Light emission

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Flip Chip Assembly Using Carbon Nanotube Bumps and Anisotropic Conductive Adhesive Film

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ECS Transactions 2010年第1期27卷

作者： Xia Zhang Teng Wang Pär Berggren Si Chen Johan Liu Shanghai University Chalmers University of Technology SHT Smart High-Tech AB SMIT Ltd Key Laboratory of Advanced Display and System Applications Ministry of Education & SMIT Center Shanghai University Shanghai China

Carbon Nanotube (CNT) has been proposed as a promising candidate material to build next generation flip chip interconnects in electronics. In this paper, flip chip assembly using CNT bumps and ACF is performed. To realize CNT-based interconnects, post-growth processes including deposition of metallic layers on CNT bundles and low temperature transfer of CNT bundles have been developed to overcome the problems of the high growth temperature of CNT as well as the poor adhesion between CNT bumps and substrates. Moreover, ACF has been used to assemble the CNT bumps on another Si substrate. The electrical test is performed also to verify the good contact between CNT bumps and ACF.

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Efficient and chromatic-controllable white organic light-emitting diodes on plastic substrates using color conversion methods

Efficient and chromatic-controllable white organic light-emi...

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16th International display Workshops, IDW '09

作者： Li, Bo Sun, Sanchun Lu, Lin Liao, Yingjie Li, Chunya Zhang, Jianhua Xu, Hongguang Wei, Bin Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University 149 Yanchang Rd. Shanghai 200072 China SVA Electron Co. Ltd. FPD Building 149 Yanchang Rd. Shanghai 200072 China

The chromatic-stability white organic light emitting diodes have been investigated basing on color conversion method, and result found little CIE coordinate migration under driving voltage from 5V to 12V.

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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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Unsupervised human height estimation from a single image

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Journal of Biomedical Science and Engineering 2009年第6期2卷 425-430页

作者： Ye-Peng Guan School of Communication and Information Engineering Shanghai University Key Laboratory of Advanced Displays and System Application Ministry of Education

The single image containing only a human face not previously addressed in the literature is employed to estimate body height. The human face especially the facial vertical distribution possesses some important information which strongly correlates with the stature. The vertical proportions keep up relative constancy during the human growth. Only a few facial features such as the eyes, the lip and the chin are necessary to extract. The metric stature is estimated according to the statistical measurement sets and the facial vertical golden proportion. The estimated stature is tested with some individuals with only a single facial image. The performance of the proposed method is compared with some similar methods, which shows the proposal performs better. The experimental results highlight that the developed method estimates stature with high accuracy.

关键词： Human Height Estimation Golden Proportion Facial Proportion Feature Extraction Projection Model

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Adaptive Motion Segmentation for Changing Background

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Journal of Software Engineering and applications 2009年第2期2卷 96-102页

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

Segmentation of moving objects efficiently from video sequence is very important for many applications. Background subtraction is a common method typically used to segment moving objects in image sequences taken from a statistic camera. Some existing algorithms cannot adapt to changing circumstances and require manual calibration in terms of specification of parameters or some hypotheses for changing background. An adaptive motion segmentation method is developed according to motion variation and chromatic characteristics, which prevents undesired corruption of the background model and does not consider the adaptation coefficient. RGB color space is selected instead of introducing complex color models to segment moving objects and suppress shadows. A color ratio for 4-connected neighbors of a pixel and multi-scale wavelet transformation are combined to suppress shadows. The mentioned approach is scene-independent and high correct segmentation. It has been shown that the approach is robust and efficient to detect moving objects by experiments.

关键词： Motion Segmentation Background Update Background Subtraction Motion Variation Shadow Suppression

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An improved dual field modular inversion algorithm and VLSI implementation

An improved dual field modular inversion algorithm and VLSI ...

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1st International Conference on Information Science and Engineering, ICISE2009

作者： Chen, Guanghua Zhu, Jingming Liu, Ming Zheng, Weifeng School of Mechatronics Engineering and Automation Shanghai Key Laboratory of Power Station Automation Technology Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications Ministry of Education and Microelectronic Shanghai University Shanghai 200072 China

ISBN: (纸本)9780769538877

An improved dual filed modular inversion algorithm which can support inversion operation in both GF(P) and GF(2∧m) is proposed in this paper. Compared with previous ones based on Extended Euclidean algorithm, it not only finishes modular inversion arithmetic in dual fields, but also operates much faster by more effective shift operations and avoiding time-consuming magnitude comparison. The simple addition/subtraction becomes the most complex operation in the new algorithm while the multiplication/division is replaced by cheap shifting, and thus only two adders and one subtraction device are required to complete its hardware implementation. The 256-bit modular inversion circuit based on the improved algorithm is implemented in SMIC 0.18 CMOS standard cell technology. The synthesis result indicates that the design is about 17% faster than that of previous algorithms while the area is only 5% larger. ©2009 IEEE.

关键词： VLSI circuits

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Improvement of interleaved multiplication algorithm

Improvement of interleaved multiplication algorithm

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1st International Conference on Information Science and Engineering, ICISE2009

作者： Chen, Guanghua Liu, Ming Zhu, Jingming Zheng, Weifeng School of Mechatronics Engineering and Automation Shanghai Key Laboratory of Power Station Automation Technology Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications Microelectronic Research and Development Center Shanghai University Shanghai 200072 China

ISBN: (纸本)9780769538877

An improved modular multiplication algorithm based on the interleaved multiplication is presented in this paper. Carry save addition (CSA), redundant representation, a fast lookup table and a counter register are used to improve this algorithm. Carry save addition and redundant representation are used to replace other additions like carry select addition, carry lookahead addition and so on, because carry propagation brought by those additions can be prevented by carry save addition, and redundant representation can make the arithmetic operations fast without carry propagation. The fast lookup table with only 7 pre-calculated values can minimize the number of additions, and can only be addressed once in one iteration, which not only speed up, but also save area compared with other literatures used lookup tables. The iteration number can be reduced by a counter register being added in this improved method to compute the number of 0 from the most significant bit of one operand like X. Analysis and emulation result shows the area and time complexity (AT) of the improved method is equal or even less than 2n2. ©2009 IEEE.

关键词： Table lookup

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Interactive object segmentation using kernel density estimation based graph cuts

Interactive object segmentation using kernel density estimat...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Zhongmin Han Baoyan Ding Zhi Liu Liquan Shen Zhaoyang Zhang School of Communication and Information Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai China

This paper proposes an efficient and flexible interactive object segmentation approach using kernel density estimation based graph cuts. First, the user draws scribbles to roughly mark the interested object and background, respectively, and the likelihood of object versus background is evaluated for each pixel using nonparametric kernel density estimation. Then pixels are globally classified into object and background using graph cuts, which uses likelihood as data cost and gradient information to generate a spatial varying smoothness cost. If the user is not satisfied with the initially segmented object, the user is allowed to mark these undesirable regions by drawing additional scribbles. A local region for refinement is then adaptively determined, and pixel reclassification is performed to extract a more accurate object boundary. Experimental results on a variety of images demonstrate that interested objects with good visual quality can be extracted with less user interaction and a timely response.

关键词： Object segmentation Kernel Image segmentation Humans Iterative algorithms Data mining displays Pixel Cost function Parametric statistics

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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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IET International Communication Conference on Wireless Mobile and Computing (CCWMC 2009)

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

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.

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