检索结果-内蒙古大学图书馆

Low voltage organic light-emitting devices with step barrier layer

Guangdianzi Jiguang/Journal of Optoelectronics Laser 2008年第7期19卷 865-868页

作者： Xu, Wei Khan, R.F. Jiang, Xue-Yin Zhang, Zhi-Lin Zhu, Wen-Qing Key Laboratory of Advanced Display and System Application Shanghai University Shanghai 200072 China Department of Materials Science Shanghai University Shanghai 200072 China

The electron injection transportation in OLEDs were improved by using a Gaq layer between tris(8-hydroxyquinoline) aluminum (Alq3) (or 4'7-diphyenyl-1, 10-phenanthroline (Bphen)) and 2-t-Butyl-9, 10-di-(2-naphthyl) anthracene (TBADN) as step barrier. Because the lowest unoccupied molecular orbital (LUMO) of Gaq (2.9 eV) lies in between that of Alq3(3.1 eV) (or Bphen (3.0 eV)) and TBADN (2.8 eV), step barrier from Alq3(or BPhen) through 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 that without step barrier. For electron-only devices, the driving voltage at the current density of 20 mA/cm2were reduced from 7.9 V to 4.9 V for devices with Alq3, 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 Gag step barrier was introduced. at 20 mA/cm2, the driving voltage were reduced from 7 V to 5.8 V for devices with Alq3and from 6.2 V to 5.1 V for devices with Bphen. When step barrier was introduced, the luminance at 200 mA/cm2were increased from 1992 cd/m2to 3281 cd/m2for device with Alq3, and from 1745 cd/m2to 2876 cd/m2for devices with BPhen respectively. The phenomena were explained by using tunnel theory.

关键词： Molecular orbitals

来源：评论

学校读者我要写书评

暂无评论

Pure blue tandem OLED based on terfluorenes compounds

引用

Guangdianzi Jiguang/Journal of Optoelectronics Laser 2008年第12期19卷 1584-1586页

作者： Wei, Fu-Xiang Fang, Liang Jiang, Xue-Yin Zhang, Zhi-Lin School of Materials Science and Engineering China University of Mining and Technology Xuzhou 221008 China Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai 201800 China

We demonstrate a pure-blue tandem organic light-emitting device (OLED) employing the blue fluorescent emitter, ter(9, 9-phenylfluorene) fluoride (TPFF). The charge generation region consists of a Li-doped electron transport layer and a highly transparent WO3thin film. Highly efficient pure-blue emission is obtained from the device. The maximum luminous efficiency of 2.08cd/A with CIE coordinate of (0.156, 0.078) is obtained. The power efficiency of tandem device is also significantly enhanced compared with the single-emissive unit device at high brightness. It is indicated that employing the tandem device structure is a promising route to achieve high brightness and efficient pure-blue emission.

关键词： Current density

来源：评论

学校读者我要写书评

暂无评论

Low-voltage and high efficiency tandem white organic light emitting diodes

Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors

引用

Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors 2008年第12期29卷 2417-2420页

作者： Wei, Fuxiang Fang, Liang Jiang, Xueyin Zhang, Zhilin School of Materials Science and Engineering China University of Mining and Technology Xuzhou 221008 China Key Laboratory of Advanced Display and System Application of the Ministry of Education Shanghai University Shanghai 201800 China

We report a white tandem organic light-emitting device (TOLED) with high efficiency and low drive voltage using Bphen: Li/WO3 as the interconnecting layer. The TOLED have been fabricated by connecting two low-voltage driving white units with conductive transport layers. The tandem two-unit device produces two higher luminance efficiency than that expected of a single-unit device. A maximum efficiency of 17cd/A is achieved by the tandem device comprised of two white-fluorescent OLEDs. The power efficiency of tandem white organic light-emitting device is enhanced by 53% as compared to the control device. ©2008 Chinese Institute of Electronics.

关键词： Efficiency

来源：评论

学校读者我要写书评

暂无评论

Digital dimmable controller in CCFL module based on variable frequency technique

Digital dimmable controller in CCFL module based on variable...

引用

International Conference on (ICEPT) Electronic Packaging Technology

作者： Feng Ran Tiezhu Li Meihua Xu Jian Wu Key Laboratory of Advanced Displays and system Application Ministry of Education Shanghai University China

A novel simple control method to improve the ignition behavior of cold cathode fluorescent lamp (CCFL) in digital-dimming mode is proposed in this paper. To extend the lamp life, we designed a digital-dimming controller (DDC) in cold cathode fluorescent lamp based on variable frequency technique. The design was simulated by Cadence Spectre. It is effective to eliminate the ignition current spike and reduce the high ignition voltage.

关键词： Oscillators Frequency control Ignition Voltage control Resonant frequency Capacitors Fault currents

来源：评论

学校读者我要写书评

暂无评论

Thin film encapsulation of OLED displays with organic-inorganic composite film

Thin film encapsulation of OLED displays with organic-inorga...

引用

Electronic Components and Technology Conference (ECTC)

作者： C.Y. Li B. Wei Z.K. Hua H. Zhang X.F. Li J.H. Zhang Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University China Shanghai University Shanghai Shanghai CN Key Laboratory of Advanced Display and System Applications (Shanghai University) Ministry of Education China

Organic Light-Emitting diode (OLED) display is considered as one of the most potential display technology. Since it has the advantages of low-driving voltage, high luminance and high efficiency, the OLED can perform large area panel full-color display and flexible organic electroluminescent display. OLED display has been extensively studied and become a hot spot in international research recently. However, the short operation lifetime due to the sensitivity to vapor and oxygen limits the process of OLED technology to industrialization. Hence effective encapsulation technology is the best way to solve the problem. High-performance Thin Film Encapsulation (TFE) should be fabricated to realize long-time driving OLED display. First, a high-quality TFE should have a good diffusion barrier to water and oxygen penetration, high flexibility or mechanically robust to avoid cracking during bending. Secondly, a TFE should have good heat diffusion effect. This is because the device may degrade when the current is turn on, resulting from the electro-chemical process. The heat accumulation will promote the growth of pinhole in the cathode area and the formation of darkspot in the emissive layer. Finally, damage effect on device should be lower enough to avoid the degradation of organic layers during passivation deposition, since the organic materials cannot withstand high process temperature and also require an inert processing environment. OLED displays can be fabricated as thin as the substrate if thin film packaging is used. We propose a novel multilayer stack of organic-inorganic composite film encapsulation. The results on the barrier properties of this stack and a working passive matrix polymer OLED demonstrator are presented. The focus of this paper is to investigate the relationship between deposition parameters and its properties in order to prepare excellent organic-inorganic composite film for OLED. The compatibility with the OLED structure itself and results on device

关键词： Transistors Encapsulation Organic light emitting diodes Flat panel displays Thermal degradation Voltage Electroluminescent devices Robustness Cathodes Passivation

来源：评论

学校读者我要写书评

暂无评论

An Efficient Hardware Implementation for Intra Prediction of AVS Encoder

An Efficient Hardware Implementation for Intra Prediction of...

引用

2008 International Conference on Audio，Language and Image Processing(2008国际声音、语言、图像过程大会)

作者： Qitong Yang Zhaoyang Zhang Guowei Teng Liquan Shen Key Lab.Of Advanced Display and System Application Ministry of Education Shanghai Univ. Shanghai 200072 China

This paper describes our techniques to design the intra-prediction of AVS encoder for HDTV applications. The whole design is optimized in both the algorithm and architecture levels. On the algorithm level, since the Plane mode is the most area-costly one, it is temporarily ignored. And SATD is lastly chosen as mode decision to balance the hardware implementation with performance of Rate and Distortion. On the architecture level, in addition to five-parallel system, a new scheduling of encoding process is arranged to avoid the idle cycles together by ping-pong memory architecture between the intra-prediction and entropy coding. As a result, the proposed architecture can be implemented by 11750 Slices, achieves real-time processing of HD(1920×1088) frames at a rate of 30 jps in 100 MHz operation frequency.

关键词： Hardware Encoding Pixel Algorithm design and analysis Entropy coding Computer architecture Random access memory

来源：评论

学校读者我要写书评

暂无评论

Hardware Implementation of Transform and Quantization for AVS Encoder

Hardware Implementation of Transform and Quantization for AV...

引用

2008 International Conference on Audio，Language and Image Processing(2008国际声音、语言、图像过程大会)

作者： Leirui Wang Zhaoyang Zhang Guowei Teng Liquan Shen Xuli Shi Key Lab.Of Advanced Display and System Application Ministry of Education Shanghai Univ. Shanghai 200072 China

Multimedia applications need larger and larger bandwidth. The only way to face the demands is to provide better and faster video compression standard. Thus, A VS is created in China. To address the need for hardware acceleration of its computationally intensive parts, high throughput hardware architectures for fast computation of the 2-D Transform Quantization Inverse Quantization and Inverse Transform are presented in this paper. In addition, two high performance system architectures are presented. The proposed hardware architectures are incorporated into two different hardware systems implemented on a Virtex 4 Pro FPGA. Simulation results show that both two hardware system architectures that are incorporated proposed architectures could provide satisfactory performances.

关键词： Transforms Quantization Computer architecture Hardware Pixel Discrete cosine transforms Microprocessors

来源：评论

学校读者我要写书评

暂无评论

An efficient compressed domain moving object segmentation algorithm based on motion vector field

引用

Journal of Shanghai University(English Edition) 2008年第3期12卷 221-227页

作者：刘志沈礼权张兆杨 School of Communication and Information Engineering Shanghai University Shanghai 200072 P. R. China Key Laboratory of Advanced Display and System Application of the Ministry of Education Shanghai 200072 P. R. China

In this paper an efficient compressed domain moving object segmentation algorithm is proposed, in which the motion vector （MV） field parsed from the compressed video is the only cue used for moving object segmentation. First the MV field is temporally and spatially normalized, and then accumulated by an iterative backward projection to enhance salient motions and alleviate noisy MVs. The accumulated MV field is then segmented into motion-homogenous regions using a modified statistical region growing approach. Finally, moving object regions are extracted in turn based on minimization of the joint prediction error using the estimated motion models of two region sets containing the candidate object region and other remaining regions, respectively. Experimental results on several H.264 compressed video sequences demonstrate good segmentation performance.

关键词： moving object segmentation compressed domain segmentation motion vector （MV） field

来源：评论

学校读者我要写书评

暂无评论

A Dual-Output Voltage Reference for high-accuracy pipelined ADC

A Dual-Output Voltage Reference for high-accuracy pipelined ...

引用

International Conference on (ICEPT) Electronic Packaging Technology

作者： Dongfang Cheng Xiaohui Li Jue Zhang Jiongming Wang Key Laboratory of Advanced Displays and system Application Ministry of Education Microelectronic Research & Development Centre Shanghai University Shanghai China

A dual-output voltage bandgap reference has been designed for high-accuracy pipelined ADC with CSMC0.6 process technology in this work. Based on the temperature and noise analyzing of voltage reference, the traditional circuit has been improved. The structure with two PN junctions in series,non-operational amplifier structure and PTAT (proportional to absolute temperature) current supplied by ldquoself-biasrdquo cascode current mirror, were adopted in the circuit designed. A new method to divide voltage was suggested in this study. The simulation results showed that the dual-output voltages were 2.194 V and 1.098 V respectively when temperature varied from -10 degC to 100 degC, and the temperature coefficient is only 7.00 ppm/degC; the change of V ref only was 5.326 mV, and the PSRR was 49.3 dB when source voltage varied from 6 V to 9 V. The dual-output voltage reference of the circuit designed can meet the requirement of comparator input voltage in high-accuracy pipelined ADC.

关键词： Photonic band gap Temperature Temperature sensors Integrated circuit modeling Accuracy Converters Equations

来源：评论

学校读者我要写书评

暂无评论

Design of ADC Control Module in a MCU

Design of ADC Control Module in a MCU

引用

International Conference on Natural Computation (ICNC)

作者： Yueli Hu Ke Yan Wenyi Jing Key Laboratory of Advanced Displays and system Application Ministry of Education Microelectronics Research and Development Center Shanghai University Shanghai China

A new method for ADC IP integration in a mixed-signal MCU is proposed in this paper. The single conversion of ADC is controlled by three modes: software triggered mode, hardware triggered mode and PWM triggered mode. ADC and the PWM control module can work independently under software and hardware triggered mode. PWM triggered mode used for real-time monitoring is an innovation of the paper, which simplifies software and improves the operating efficiency of MCU. The design of the ADC control module is elaborated and full-chip mixed-signal verification using Nanosim-VCS is also given.

关键词： Pulse width modulation Registers Hardware CMOS technology application software Monitoring Clocks Integrated circuit technology Energy consumption Computer displays

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：