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作者： Wei, F.X. Khan, M.A. Zhang, X.B. Cao, J. Zhu, W.Q. Jiang, X.Y. Zhang, Z.L. 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

ISBN: (纸本)9787561752289

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 layer. Based on cohost strategy, a low-voltage driving of OLEDs with the structure of [ ITO/m-MTDATA/NPB/Alq/Liq (33%) : Bphen/LiF/Al] has been achieved. It is found that the power efficiency is enhanced by ∼ 20% while driving voltage is reduced by ∼ 15% as compared to the control device. Therefore this strategy with the judicial doping concentration 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： Electron injection

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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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作者： Xu, W. Khan, M.A. Jiang, X.Y. Zhang, Z.L. Zhu, W.Q. 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

ISBN: (纸本)9787561752289

The electron injection transportation in OLEDs were improved by using a Gaq layer between Alq (or Bphen) and TBADN as step barrier. Since 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 formed. The 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/cm2 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 barrier. For the complete devices, after Gaq step barrier was introduced, at 20 mA/cm2, 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 Bphen. When step barrier was introduced, the luminance at 200 mA/cm2 were increased from 1684 cd/m2 to 2 736 cd/m2 for device with Alq, and from 1026 cd/m2 to 2466 cd/m2 for devices with BPhen respectively. The phenomena were explained by using tunnel theory.

关键词： Molecular orbitals

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Organic thin film field effect transistors with MoO3 /Al electrode and OTS/SiO2 bilayer gate insulator

Organic thin film field effect transistors with MoO3 /Al ele...

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作者： Bai, Y. Liu, X. Chen, L. Zhu, W.Q. Jiang, X.Y. Zhang, Zh.L. 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

ISBN: (纸本)9787561752289

An organic thin-film transistor (OTFTs) having MoO3/Al electrode and OTS/SiO2 bilayer gate insulator configuration between gate insulator and source/drain electrodes is investigated. Thermal SiO2 layer grown is used as the OTFT gate dielectric;Copper phthalocyanine(CuPc) is used as an active layer. We have found that using silane coupling agents-octade-cyltrichlorosilane (OTS) to reduce the surface energy of the SiO2 gate dielectric and significantly improve device performance. This OTS/SiO2 bilayer gate insulator configuration increases the field-effect mobility, reduces the threshold voltage, and improves the on/off ratio at the same time. The device with MoO3/AI electrode had similar Ids compared to the device with Au electrode at same gate voltage. MoO3/AI was proved to be a superior electrode. Our results indicate that using double-layer of electrode and double-layer of insulator is an effective way to improve OTFT performance.

关键词： Silica

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Video nature considerations for multi-frame selection algorithm in H.264

Video nature considerations for multi-frame selection algori...

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ACS/IEEE International Conference on Computer systems and applications

作者： Liquan Shen Zhi Liu Zhaoyang Zhang Guozhong Wang Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai China

H.264 allows motion estimation performing on multiple reference frames. This new feature improves the prediction accuracy of inter-coding blocks significantly. However, the coding gain comes at the cost of a much higher computational complexity. The reference software JM adopts full search scheme, and the computational complexity of motion estimation increases linearly with the number of allowed reference frames. In fact, the reduction of prediction residues is highly dependent on the nature of sequences, not on the number of searched frames. In this paper, with consideration of video nature and the available information from previous searched reference frames, an adaptive multi-frame selection algorithm (AMFSA) is proposed to speed up the matching process for multiple reference frames in the H.264 video coding system. The proposed algorithm can effectively reduce 63.6% on average.

关键词： Motion estimation Computational complexity Video coding Information analysis Testing application software Accuracy Costs Statistical analysis Statistical distributions

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A novel algorithm to fast mode decision with consideration about video texture in H.264

A novel algorithm to fast mode decision with consideration a...

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ACS/IEEE International Conference on Computer systems and applications

作者： Liquan Shen Zhi Liu Zhaoyang Zhang Guozhong Wang Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai China

H.264 employs 7 different size block types for motion estimation that can significantly improve the coding performance compared with the previous video coding standards. However, H.264 requires extremely high computation with the R-D optimized decision since so many prediction modes are used. In this paper, a novel inter mode decision algorithm (NIMDA) is proposed that utilizes SADs of each 4X4 block and texture characteristic to reduce the candidate mode set after the 16 X16 prediction mode is tested. The simulation results show that the proposed algorithm reduces the entire encoding time by 64.52% with only negligible coding loss.

关键词： Motion estimation Image segmentation displays Video coding Testing Encoding Discrete cosine transforms Accuracy Quantization

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Establishment and application of new measurement system for work function

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2007年第4期18卷 454-456+466页

作者： Huang, Wei Liu, Shan-Peng Zhang, Hao Cao, Jin Zhu, Wen-Qing Jiang, Xue-Yin Zhang, Zhi-Lin Key Laboratory of Advance Display and System Application School of Material Science and Engineering Shanghai University Shanghai 201800 China

Using the contact potential difference method, we have designed and established a measurement system for work function, which consists of three main parts such as, signal generation part, vibration part and detection part. The reference electrode is vibrated by a low frequency sine wave signal provided by signal generation part. When the output signal of detection part is zero, by changing the load voltage of vibration part, we can get the work function of a sample by calculating the difference between the load voltage and the reference electrode. A change in the work function of ITO is observed when it is treated by UV ozone. The investigations indicate that the work function of ITO has a limiting value and the improvement in the work function of ITO can improve the performance of OLEDs. This system can measure the work function precisely accurately and quickly in atmosphere.

关键词： Work function

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Effects of surface-modified gate dielectrics on electrical characteristics of organic thin-film transistors

Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors

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Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors 2007年第10期28卷 1589-1593页

作者： Chen, Ling Zhu, Wenqing Bai, Yu Liu, Xiang Jiang, Xueyin Zhang, Zhilin Key Laboratory of Advanced Display and System Application Shanghai University Shanghai 200072 China School of Material Science and Engineering Shanghai University Shanghai 201800 China

Organic thin film transistors (OTFTs) with a modified gate insulator are demonstrated. The modified gate insulator layers consist of SiO2 as the gate insulator and OTS (octadecyltrichlorosilane) or PMMA (poly methyl methacylate) as the modified layer. The devices with the modified layer have a field-effect mobility larger than 10-3 cm2/(V·s) and an on/off current ratio greater than 104, while their leakage current is decreased to 10-10 A. The results demonstrate that using modified gate insulators is an effective method to fabricate OTFTs with improved electric characteristics.

关键词： Thin film transistors

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Multi-view video coding based on resultant vector estimation

Multi-view video coding based on resultant vector estimation

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IET Conference on Wireless, Mobile and Sensor Networks 2007, CCWMSN'07

作者： Liu, Suxing An, Ping Zhang, Zhaoyang Liu, Zhanwei 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)9780863418365

Aiming at fully exploiting the temporal redundancy and spatial redundancy, we propose a multi-view video coding scheme based on resultant vector estimation. Combining the disparity vector and motion vector as one vector, the novel "resultant vector" was first proposed. Meanwhile, by extending the loop constraint to multi-view images for a parallel camera geometry model, redundancy between views is greatly reduced by utilizing the linear relationship of adjacent views and the "resultant vector". Experimental results show that our scheme's performance is superior to conventional methods such as GOP (Group-of-picture) or M-picture. Coding efficiency is improved about 1.2-1.5 dB.

关键词： Vectors

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Improved H.264 GOP-level bit allocation by incremental PID algorithm

Improved H.264 GOP-level bit allocation by incremental PID a...

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IET Conference on Wireless, Mobile and Sensor Networks 2007, CCWMSN'07

作者： Shen, Liquan Zhang, Zhaoyang Li, Ying Liu, Zhi Key Lab. of Advanced Display and System Application Ministry of Education Shanghai Univ. Shanghai 200072 China School of Computer Engineering and Science Shanghai University Shanghai 200072 China

ISBN: (纸本)9780863418365

Since the current rate control schemes in H.264 do not present the capability of efficient GOP-level bit allocation, the video quality varies greatly for sequences with the scene change or the scene complexity varying from one GOP to another. To overcome the limitation, we propose a novel rate control scheme based on incremental PID algorithm. The incremental PID algorithm is introduced to minimize video quality variations in GOP-level bit allocation. Extensive simulation results show that the proposed rate control scheme, without expensive computational complexity added, decreases the average video quality variations by 15.07%.

关键词： Quality control

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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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