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2nd Asia Pacific Conference on Postgraduate Research in Microelectronics and Electronics, PrimeAsia 2010

作者： Jinyan, Guo Yueli, Hu Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 China College of Mechanical and Electronic Engineering and Automation Shanghai Key Laboratory of Power Station Automation Technology Shanghai University Shanghai 200072 China

ISBN: (纸本)9781424467372

In the CAN bus, mistakes in bit timing will lead to serious decline in bus performance. How to deal with the bit timing of CAN bus communication decided whether the CAN controller can receive or transmit data correctly. According to bus protocol, bit synchronization will fix bit errors resulting from improper setting in many cases. This paper illustrated the structure of nominal bit time and the principle of bit synchronization, gave an optimized method of nominal bit time of CAN2.0 protocol, that the four non-overlapping segments of traditional nominal bit time is simplified to 3 non-overlapping segments, and on this basis, proposed a design method of bit timing processor of CAN bus based on the synchronized state machine. It also provides programmable time segments to compensate for the propagation delay times and phase shifts, and gave simulation and verification of the design. The results show that the design work which obeys the CAN2.0 protocol, can more easily deal with the CAN bus communication bit timing, realized the control of CAN bus protocol on the bit timing and bit synchronization, and better optimizes the CAN network.

关键词： Synchronization

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Fatigue Life Analysis of Hybrid Bonding in Micro-LED Interconnection 21

Fatigue Life Analysis of Hybrid Bonding in Micro-LED Interco...

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21st China International Forum on Solid State Lighting and 10th International Forum on Wide Bandgap Semiconductors, SSLCHINA: IFWS 2024

作者： Meng, Xinhui Wang, Kefeng Fan, Hong Yang, Zhu Fu, Hao Yin, Luqiao Lu, Xiuzhen Zhang, Jianhua School of Microelectronics Shanghai University Shanghai201800 China Shanghai Key Laboratory of Chips and Systems for Intelligent Connected Vehicle 201800 China Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education Shanghai2000072 China

ISBN: (纸本)9798331541149

Micro-LED displays have garnered widespread attention due to their high resolution, high brightness, and long lifespan. However, the heterogeneous integration and the reliability of Micro-LEDs pose significant challenges for their commercialization. As Micro-LED products develop towards larger sizes and narrower pitches, the Au/In bonding process has become a prevalent strategy for achieving high-resolution interconnections. To address the issue of the life span being affected by the plastic deformation of indium bumps, which ultimately fail in the form of yielding, an Au/In-resin hybrid bonding technique to improve the reliability of high-resolution Micro-LEDs was proposed in this paper. The reliability of the flip-chip bonding structure of a 4×4 Micro-LED array was analyzed using ANSYS simulation software and finite element methods. The Anand unified viscoplastic constitutive model was employed for both indium bumps and the encapsulating resin. The model was subjected to temperature cycling loads ranging from -55℃ to 125℃ in accordance with the JEDEC temperature cycling standard. The Coffin-Manson fatigue life prediction model, which accounts for plastic strain in materials, was introduced to estimate the thermal cycling fatigue life of the Micro-LED interconnection structures. The equivalent plastic strain range of hybrid bonding device was 6.708×10-3, surpassing the 7.59×10-3observed in device with conventional bump bonding. The hybrid bonding device exhibited a thermal cycling life of 12747 cycles, which was about 36% longer than that of the bump bonding device. It suggests that resin helps to extend the thermal cycling life of the device and enhance its reliability. ©2024 IEEE.

关键词： Flip chip devices

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Optical Optimization of Deep Submersible LED Light on Silicone Package

Optical Optimization of Deep Submersible LED Light on Silico...

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International Conference on (ICEPT) Electronic Packaging Technology

作者： Pinhan Huang Tong Chen Luqiao Yin Tingting Zhao Jianhua Zhang Key Laboratory of Advanced Display and System Applications (Shanghai University) Shanghai China

ISBN: (数字)9781728150642

ISBN: (纸本)9781728150659

Deep submersible lighting with LED as the light source commonly used sapphire glass as a pressure-resistant transparent window, but the refractive index of sapphire glass is 1.76~1.78, which will produce sizeable specular reflection at the interface with air, resulting in loss of light energy. To solve this problem, a method of encapsulating a sapphire mirror to form an anti-reflection layer using optical silica gel has been proposed. Through the calculation and selection of suitable optical silica gel, the structural design and preparation process of silica gel anti-reflection is completed. Finally, optical simulation analysis by TracePro, it was found that the use of IVS4542 silica gel with a refractive index of 1.41 can increase the light transmittance of the lamp by 2.08%.

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Efficiency and color rendering index improvement of white organic light-emitting device for lighting applications

Efficiency and color rendering index improvement of white or...

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第十届中国国际半导体照明论坛

作者： Jianning Yu Bin Wei Jianhua Zhang Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai University

High efficiency performance[1,2] and color rendering index(CRI)[3-7] are two main requirements for white organic light-emitting diode(WOLED) which can be applied in high-quality lighting *** report successful fabrication of efficient and high CRI phosphorescent WOLED by employing ultra-thin emitting layer architecture[8] and developing multi-peak electroluminescence spectra[9].By fine-tuning the thicknesses of emitting layers and space layer,we have obtained WOLED with a high CRI of 80 and high luminance efficiency(LE) of 29.2 cd/A which only rolls off to 22.8 cd/A at 1000 cd/*** multi-peak WOLED,CRI above 85 and a maximum luminance efficiency of 27.3 cd/A are realized with three *** four-peak WOLED yields color-temperature tunable white emission in the luminance range of 100 cd/m2 to 5000 cd/m2,demonstrates a sunlight-like spectrum with a CRI of 89 at 5000 cd/*** ultra-thin emitting layer is a promising technique to achieve high performance WOLED and the wide color-temperature span of four-peak WOLED could meet the requirement for lighting indwellings.

关键词： Efficiency and color rendering index improvement of white organic light-emitting device for lighting applications

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Optimization of microcavity top-emitting organic light-emitting devices with MoOx as hole iqjection layer

Optimization of microcavity top-emitting organic light-emitt...

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作者： Cao, Jin Zhu, Wenqing Jiang, Xueyin Zhang, Zhilin Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 China Department of Materials science Shanghai University Shanghai 200072 China

ISBN: (纸本)9787561752289

Top-emitting organic light-emitting devices (TOLEDs) using a thin MoO x film deposited on a thick Ag as the reflective anode and LiF/Al/Ag as the semitransparent cathode are demonstrated. The hole injection of Ag anode can be significantly improved with surface modification using a MoOx thin film. For microcavity TOLEDs, optical length pay important role in determing the efficiency and color of the devices. By changing the optical length, the cavity resonance can be tuned to be consistent with the peak wavelength of spontaneous emission. In this way, the optimized efficiency is obtained. With Alq3 as the emitting layer, the optimized TOLEDs with MoOx as hole injection layer shows a tune-on voltage of 2. 68 V and a maximum current efficiency of 7.44 cd/A, which are much better than those (3.37 V, 4.67 cd/A) obtained from the conventional OLED. The good performance of TOLED is attributed to the efficient hole injection from the Ag/MoOx anode as well as the optimized microcavity effect.

关键词： Anodes

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Improved Out-coupling emission of organic Light-emitting diodes by employing longitudinal wave guides

Improved Out-coupling emission of organic Light-emitting dio...

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International Conference on Material Science and Engineering（ICMSE 2016）

作者： Yang Lin Shiqi Liu Weiling Li Guo Chen Bin Wei Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University

We improved the current efficiencies of Organic Light-emitting diodes from 50 cd/A to 77.7and 65.4 cd/A by employing Ag-thin-film and Al2O3-thin-film longitudinal wave guides with the same device structures, respectively, which was attributed to the recycle use of the internal mode because the reflection of the thin-film longitude wave guides. In addition, the introduction of these wave guides exported slight influence on the spectra which was resulted from mode selection by the micro-cavity consisting of ITO and organic layers.

关键词： Improved Out-coupling emission of organic Light-emitting diodes by employing longitudinal wave guides

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A new optimized gray scale control method based on parallel sub-frame and bit scan

A new optimized gray scale control method based on parallel ...

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作者： Yan, Limin Wang, Tianxiong Gao, Hui Key Laboratory of Advanced Display and System Applications Shanghai University Microelectronic R and D Center Shanghai University Campus 149 Yanchang Road Shanghai 200072 China

ISBN: (纸本)9787561752289

Gray scale is one of the most important parameters to judge the display quality of Flat Panel display (FPD). The widely used technique to control the FPD's gray scales nowadays is Pulse Width Modulation (PWM) and Sub-frame, which orderly scan display pixels by row, column and frame to obtain the gray scale display. It results in lots of time waste in the scanning process. This paper dissertates the construction of the space-time mapping topology architecture that cast grayscale matrix in space to a gray-scale scanning space-time plane. By the construction, it presents a new optimized gray scale control method which based on scanning by bit and parallel Sub-frame transmission. The method proposed in this paper aims at the time redundancy which commonly exists in the FPD imaging process, and break through the traditional imaging method by decomposing one plane into multi-planes. Based on this novel idea and the construction of the scanning space-time mapping topology architecture, a Box Insert Model is proposed in the paper. The theoretic model have significant meaning to solve the bottle problem of transfer speed from memory space to display plane, and provide a new way of enhancing scan efficiency and reducing refresh frequency.

关键词： Mapping

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High-performance,large-area perovskite light-emitting diodes

High-performance,large-area perovskite light-emitting diodes

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第10届亚洲和澳大利亚真空与表面科学会议、中国真空学会2021学术年会、第十五届国际真空科学与工程应用学术会议

作者： Lin Wang Xuyong Yang Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University

Metal halide perovskites based light-emitting diodes (PeLEDs) have attracted extensive attention for lighting and display applications because of their excellent advantages,such as narrow emission bandwidth,color tuna... 详细信息

关键词： metal halide perovskite light-emitting diodes large-area

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

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

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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

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Linker aggregation engineering of TADF materials to tune carrierbalance for highly efﬁcient organic LEDs with long operationallifetime

Aggregate

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Aggregate 2024年第5期5卷 385-393页

作者： Zhen Zhang Rongrong Xia Ke Wang Youjun Wu Panpan Zang Xuemin Gan Zhangcheng Liao Bin Wei Peng Wu Stefan Bräse Zixing Wang Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai UniversityShanghaiChina Institute of Organic Chemistry Karlsruhe Institute of Technology(KIT)KarlsruheGermany Institute of Biological and Chemical Systems-Functional Molecular Systems(IBCS-FMS) Karlsruhe Institute of Technology(KIT)KarlsruheGermany

Thermally activated delayedﬂuorescence(TADF)molecules are regarded as promis-ing materials for realizing high-performance organic light-emitting diodes(OLEDs).The connecting groups between donor(D)and acceptor(A)units in D–A type TADF molecules could affect the charge transfer and luminescence performance of TADF materials in aggregated *** this work,we design and synthesize four TADF molecules using planar and twisted linkers to connect the aza-azulene donor(D)and triazine acceptor(A).Compared with planar linkers,the twisted ones(Az-NP-T and Az-NN-T)can enhance A–A aggregation interaction between adjacent molecules to balance hole and electron *** a result,highly efﬁcient and stable deep-red top-emission OLEDs with a high electroluminescence efﬁciency of 57.3%and an impressive long operational lifetime(LT_(95)∼30,000 h,initial luminance of 1000 cd m^(-2))are *** study provides a new strategy for designing more efﬁ-cient and stable electroluminescent devices through linker aggregation engineering in donor–acceptor molecules.

关键词： acceptor stacking balanced carrier transfer host materials long device lifetime thermally activated delayedﬂuorescence

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