检索结果-内蒙古大学图书馆

Effects of ultrasonic bonding parameters on reliability of flip chip GaN-based light emitting diode

Journal of Shanghai University(English Edition) 2011年第4期15卷 262-266页

作者：杨连乔袁方张建华 Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of Education School of Mechatronics Engineering and Automation Shanghai University

This work applied the ultrasonic bonding to package flip chip GaN-based light emitting diodes （flip chip LEDs） on Si substrates. The effects of ultrasonic bonding parameters on the reliability of flip chip GaN-based LED were investigated. In the sequent aging tests, samples were driven with a constant current of 80 mA for hundreds hours at the room temperature. It was found that the electroluminescence （EL） intensity variation had a large correlation to the ultrasonic power, and then to the bonding temperature and force. A high bonding temperature and ultrasonic power and a proper bonding force improved the EL intensity significantly. It was contributed to a strong atom inter-diffusion forming a stable joint at the bonding interface, The temperature fluctuation in the aging test was the main factor to generate a high inner stress forming delamination at the interface between the chip and Au bump. As a result, delamination had retarded the photons to emit out of the LED packaging and decay its EL intensity.

关键词： light emitting diode （LED） flip chip LED electroluminescence （EL） intensity ultrasonic bonding delamination

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High efficient and high color rendering index white organic light-emitting diodes

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Journal of Shanghai University(English Edition) 2011年第4期15卷 252-255页

作者：张民艳尚玉柱徐红吕燕芳于建宁魏斌 School of Materials Science and Engineering Shanghai University Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of Education

We have fabricated high-efficient white organic light-emitting diodes （WOLEDs） using two types of electron transport materials with different electron mobility. The effect of the electron mobility on the device performance is discussed. In addition, to generate the desired white emission and high color rendering index, we perform the structure design of OLED, in which the functions of co-host of blue and green dopants on chromatic-stability are investigated. Experimental results find that the maximum color rendering index reaches as high as 91 at the voltage of 8 V.

关键词： white organic light emitting diodes （WOLEDs） charge balance energy transfer color rendering index

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Characteristics of bottom gate a-Si TFT array for AM-OLEDs

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Journal of Shanghai University(English Edition) 2011年第4期15卷 239-241页

作者：张浩陈龙龙石继锋李春亚路林李喜峰张建华 School of Mechatronics Engineering and Automation Shanghai University Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of Education

The authors have fabricated bottom gate amorphous silicon thin film transistor （a-Si TFT） array using five-step lithography process. The device shows a field effect mobility of 0.43 cm2/（V.s）, on/off ratio of 7.5×10^6 and threshold voltage of 0.87 V. The instability of a-Si TFT is ascribed to the defect state in the a-Si channel and SiNx/a-Si interface. The present a-Si TFT array with SiNs insulator could be a significant step towards the commercialization of active matrix organic lighting diode （AM-OLED） technology.

关键词： morphous silicon （aoSi） transistor array stability

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High-brightness organic light-emitting diodes

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Journal of Shanghai University(English Edition) 2011年第4期15卷 248-251页

作者：尚玉柱吕燕芳于建宁张民艳徐红魏斌 School of Materials Science and Engineering Shanghai University Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of Education

The research of high-brightness organic light-emitting diodes, as an important branch of organic light-emitting diodes （OLEDs）, makes it possible for achieving high-brightness lighting source and lasing. Heat dissipation and efficiency roll off, as two main factors, affect the brightness of the OLEDs heavily. In this paper, high-brightness OLEDs are obtained by utilizing pulse voltage, small areas and micro-cavity structure to minimize the effect of the two factors. The major advances, ongoing challenges and future perspectives of this research frontier are also critically discussed.

关键词： organic llght-emitting diodes （OLEDs） high brightness pulse voltage small areas micro-cavity structure

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Examining micro-cavity parameters of top emission organic light-emitting diode with low-order resonant modes

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Journal of Shanghai University(English Edition) 2011年第4期15卷 235-238页

作者：曹进王立张建华 Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of Education School of Materials Science and Engineering Shanghai University

Emission characteristics of top emitting organic light-emitting devices （TOLEDs） with Ag as reflective anode, Al/Ag as semitransparent cathode and 90 160 nm [N-（1-naphthyl）-N-phenyl-amino] biphenyl/tris-（8-hydroxy quinoline） aluminum （NPB/Alq3） sandwiched in the electrodes are examined. The electroluminescence （EL） spectra of the TOLEDs are simulated based on the Fabry-Perot cavity theory. And the resonant modes in cavity structure of TOLEDs is discussed and clarified which can accurately describe the work principle of the devices. A fairly good match between calculated values and experimental data is achieved at different emission colors from bluish green to orange.

关键词： top-emitting organic light-emitting devices （TOLEDs） micro-cavity resonant modes

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Fast seam carving based on direction map

Fast seam carving based on direction map

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IET International Communication Conference on Wireless Mobile and Computing, CCWMC 2011

作者： Du, Huan Liu, Zhi Xue, Yinzhu Shi, Ran School of Communication and Information Engineering Shanghai University China Key Laboratory of Advanced Display and System Application Ministry of Education China

ISBN: (纸本)9781849195058

Seam carving is a new image retargeting method, which can alleviate the distortion on the main content of the image compared to the traditional scaling method. However, the original seam carving method uses the gradient amplitudes of pixels to construct the energy map, but neglects the gradient directions of pixels. Actually, the gradient direction refers to the direction where the pixel has the maximum rate of change. We can use the gradient direction of pixels to construct the direction map, and then naturally generate multiple seams from top to bottom based on the direction map. In addition, we use the priority windows to avoid intersecting seams. Experimental results show that our method can accelerate the speed of seam carving about 98 times while maintaining the quality of the image retargeting result.

关键词： direction map image retargeting priority window method seam carving

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An effective error concealment method used in multi-view video coding

An effective error concealment method used in multi-view vid...

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4th International Congress on Image and Signal Processing, CISP 2011

作者： Liang, Liang Ma, Ran An, Ping Liu, Chang School of Communication and Information Engineering Shanghai University Shanghai China Key Laboratory of Advanced Display and System Application of the Ministry of Education Shanghai China

ISBN: (纸本)9781424493067

Multi-view video coding (MVC) is one of the newest video compression standards, which has better compression efficiency than single view video coding. As the coding scheme exploits spatial, temporal and inter-view dependability for this scope, it leads the reconstructed multi-view video (MVV) become worse when transmitted in error-prone networks. To solve this problem, an effective error concealment (EC) method for MVC is proposed in this paper. The proposed method conceals a corrupted block by combining a few candidate blocks in intra-view reference frames or inter-view reference frames. The experimental results show that the proposed method has better concealment effect if using the inter-view reference frames effectively in B-view. © 2011 IEEE.

关键词： Image coding

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The design of synchronous module in AM-OLED display controller

The design of synchronous module in AM-OLED display controll...

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2011 International Conference on Electric and Electronics, EEIC 2011

作者： Junwei-Ma Ran, Feng School of Mechatronical Engineering and Automation Shanghai University Shanghai China Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University China

ISBN: (纸本)9783642216961

On the basis of the analysis to the framework of AM-OLED display controllers, a key module - synchronous module is studied. In this paper, a FIFO circuit (first in first out) is designed using Gray convert technology and dual-port ram, which realizing scatheless transmit between different clock domain. The working principle of FIFO is analyzed, and the optimized FIFO circuit structure was put forward to improve the working stability of the FIFO. The synchronous module circuit was implemented by VerilogHDL language simulated through VCS (Verilog compiled simulator). The design had been applied successfully to a type of full colour TFT-OLED panel driver controller with gray levels 256, frame scanning frequency 60Hz ~ 100Hz. The testing results showed that this controller worked well with a stable and vivid display. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Controllers

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Video retargeting using optimized crop-and-scale

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Journal of Shanghai University(English Edition) 2011年第4期15卷 331-334页

作者：薛银珠杜欢刘志张兆杨 School of Communication and Information Engineering Shanghai University Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of EducationShanghai 200072P.R.China

Mobile devices are increasingly powerful in multimedia transmitting and browsing. However, the small screen and different aspect ratios of mobile devices lower visual quality while watching images or videos. Video retargeting is aim at fitting an existing video into arbitrary size and aspect ratio. Previous content-aware retargeting methods are mostly high computational cost, which limits their applications on the portable devices with low computation ability. In this paper, a new crop-and-scale approach is presented to adapt video to better suit the target display. We automatically find the optimal parameters of cropping window using the dynamic programming method,, and then scale it to fit the target display. The cropping window can smoothly shift during a shot to follow the movement＇of important objects. The retargeting results using our approach introduce no deformation and jitter effects over the whole video. Experimental results show the success of our approach on adapting a variety of source videos to small display sizes.

关键词： crop-and-scale dynamic programming video retargeting

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systematic studies on scan and driving model for flat panel display

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Journal of Shanghai University(English Edition) 2011年第4期15卷 279-286页

作者：徐美华冉峰陈章进翁世浩 School of Mechatronics Engineering and Automation Shanghai University Key Laboratory of Advanced Display and System Application (Shanghai University) Ministry of EducationShanghai 200072P.R.China Micro-electronic Research and Development Center Shanghai University

Aiming at the time redundancy in the fiat panel display （FPD） imaging process, the paper studied some problems for FPD gray scale controlling based on the fraetal theory, dissertates the construction of the space-time mapping topology architecture, the proposition of optimal scanning structure for FPD＇s gray imaging, and the creation of the fractal theoretic model. Then the logic implementation and system application are presented based on the fraetal model of the optimal scan architecture, and the application results achieved target of eliminating time redundancy and increasing the scanning availability. The novel control mode that the fractal scanning IP core described with Verilog language embedded in the FPGA hardware frame can efficiently increase the imaging gray scales and quality in the FPDs scanning controller and speed up the frame frequency of display system.

关键词： fiat panel display （FPD） space-time mapping optimal scan architecture fractal model logic implementation IP core

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