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Thermodynamic Analysis of Multi-Stage Thermal Compression Bonding for Fabricating Vertically Stacked Micro-Led Array

Thermodynamic Analysis of Multi-Stage Thermal Compression Bo...

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China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Lianyu Wang Kailin Ren Luqiao Yin Jianhua Zhang School of Microelectronics Shanghai University Shanghai China Shanghai Collaborative Innovation Center of Intelligent Sensing Chip Technology Shanghai University Shanghai China Shanghai Key Laboratory of Chips and Systems for Intelligent Connected Vehicle Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications (Ministry of Education) Shanghai University Shanghai China

ISBN: (数字)9798331541149

ISBN: (纸本)9798331541156

Vertical full-color Micro-LEDs based on flip-chip bonding technology are of great significance in high-resolution display applications, as they have many advantages such as high pixel density, high brightness, and wide color gamut. However, the construction of vertical full-color Micro-LEDs requires multiple thermal compression bonding (TCB). Therefore, thermal stress analysis during multiple TCB is necessary. In this work, the surface thermal stress of a 5×5 vertical Micro-LED array during multi-stage TCB is studied by finite element method (FEM) simulations. The stresses at LED-LED bonding interface and stacked LED-backplane bonding interface as well as the interactions between the two bondings are investigated. The results of different bonding temperatures, material combinations, and interconnected metal diameters and depths on the mean stresses at the bonding interface are analyzed, and then the adequacy of bonding and risk of debonding are assessed. The results show that among the hybrid bonding material combinations set in the simulation, the Cu/ Al 2 O 3 has the largest interfacial stress. In addition, decreasing the interconnected metal diameter and lowering the bonding temperature can relieve the interfacial stress, while the interconnected metal depth has no significant effect on the bonding stress. The key advantage of this work is that it can help establish design and process guidelines to shorten the development cycle of vertical full-color Micro-LEDs based on flip-chip bonding technology.

关键词： Thermodynamics Photonic band gap Metals Thermal analysis Finite element analysis Flip-chip devices Bonding Stress Thermal stresses Guidelines

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Monolithically Integrated Temperature Sensor Based on p-GaN/AlGaN/GaN Heterostructure

Monolithically Integrated Temperature Sensor Based on p-GaN/...

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China International Forum o Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)

作者： Qingxin Liu Kailin Ren Luqiao Yin Jianhua Zhang School of Microelectronics Shanghai University Shanghai China Shanghai Key Laboratory of Chips and Systems for Intelligent Connected Vehicle Shanghai University Shanghai China Shanghai Collaborative Innovation Center of Intelligent Sensing Chip Technology Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications (Ministry of Education) Shanghai University Shanghai China

ISBN: (数字)9798331541149

ISBN: (纸本)9798331541156

A monolithically integrated temperature sensor circuit based on a p-GaN/AlGaN/GaN heterojunction is proposed. The sensor comprises two parts: the first part is a temperature-sensitive voltage source formed by a two-dimensional electron gas (2DEG) resistor and a schottky barrier diode (SBD) in series, and the second part is a resistor-transistor logic (RTL) inverter formed by a 2DEG resistor and a p-GaN high electron mobility transistor (HEMT) in series. The output voltage of the temperature-sensitive voltage source is connected to the gate of the p-GaN HEMT in the second part, providing the gate voltage. According to data obtained from TCAD simulation results, the output voltage of the temperature-sensitive voltage source exhibits positive temperature dependence. The output voltage of the RTL inverter exhibits a negative temperature dependence. When the temperature sensor is properly biased, the voltage division between the SBD and the 2DEG resistor in the temperature-sensitive voltage source reallocates as the temperature rises, causing the gate voltage of the connected RTL inverter to increase. This increasement enhances the temperature-induced variation in the RTL inverter's output voltage, increasing the sensitivity of the temperature sensing circuit from 4 mV/K with a fixed gate voltage to 14 mV/K. This simulation demonstrates a compact monolithic integration sensor for monitoring the on-chip temperature of GaN power integrated circuits for protection and control.

关键词： Temperature sensors Resistors Temperature dependence Sensitivity HEMTs Logic gates Thermal management Inverters system-on-chip MODFETs

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A Method of Constructing and Automatically Labeling Radio Frequency Signal Training Dataset for UAV

A Method of Constructing and Automatically Labeling Radio Fr...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Chao Liu Ruipeng Ma Zheng Si Mingmin Chi School of Computer Science Shanghai Key Laboratory of Data Science Fudan University Zhengzhou Zhongke Institute of Integrated Circuit and System Application School of Cyber Science and Engineering Zhengzhou University Henan Institute of Advanced Technology Zhengzhou University

The problem of signal detection and classification of multiple UAVs can be solved using object detection techniques in computer vision. However, this requires collecting and labeling a large amount of reliable raw data. Since the UAV signal dataset cannot be directly applied to object detection, we propose a method using time-frequency domain filtering and automatic labeling to construct a large-scale time-frequency spectrogram dataset. Experimental results show that the average recognition accuracies of image transmission signals and remote control signals under interference conditions are 97% and 82%, respectively, while the average errors of signal parameters are 0.93% and 5.57%.

关键词： Training Time-frequency analysis Object detection Manuals Labeling Reliability Speech processing

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A Low Delay AES Round Transform Architecture Using Constant Matrix Multiplications Merging Technologies 17

A Low Delay AES Round Transform Architecture Using Constant ...

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17th IEEE Conference on Industrial Electronics and applications, ICIEA 2022

作者： Zheng, Xinxing Zhang, Xiaoqiang Yang, Fan Xu, Mingyu Yan, Han Wuhu Institute of Technology College of Information Engineering Wuhu China Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment Ministry of Education Wuhu China Engineering Research Center of Vehicle-Mounted Display Integration System Wuhu China Anhui Polytechnic University College of Electrical Engineering Wuhu China

ISBN: (纸本)9781665409841

This paper presents a low delay architecture design method for the hardware implementation of the advanced Encryption Standard (AES) algorithm. The proposed architecture is designed by using constant matrix multiplications (CMM) merging technologies. To reduce the area cost in hardware implementations, S-box/InvS-box is usually implemented with composite field arithmetic (CFA) technologies. In this paper, CMM in CFA-based S-box/InvS-box are further merged with constant coefficient multiplications in MixColumns/ InvMixColumns, which can also be expressed as CMM forms. By the merging, the delay of the hardware implementation of encryption round transform is reduced at the cost of slight area cost increasing, and both delay and area cost are reduced in hardware implementations of decryption round transform. Hardware complexities analysis indicates that our designs have less delay compared with previous works. © 2022 IEEE.

关键词： Cryptography

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Spectrum-dependent photonic synapses based on 2D imine polymers for power-efficient neuromorphic computing

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InfoMat 2021年第8期3卷 904-916页

作者： Junyao Zhang Qianqian Shi Ruizhi Wang Xuan Zhang Li Li Jianhua Zhang Li Tian Lize Xiong Jia Huang Interdisciplinary Materials Research Center School of Materials Science and EngineeringShanghai Institute of Intelligent Science and TechnologyTongji UniversityShanghaiPeople's Republic of China Translational Research Institute of Brain and Brain-Like Intelligence Shanghai Fourth People's Hospital Affiliated to Tongji UniversityShanghaiPeople's Republic of China Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghaiPeople's Republic of China

2D polymers(2DPs)have attracted increasing interests in sensors,catalysis,and gas storage ***,2DPs with unique band structure and tunable photophysical properties also have immense potential for application in photonic neuromorphic ***,photonic synaptic transistors based on 2DPs as the light-tunable charge-trapping medium are developed for the first *** resulted organic transistors can successfully emulate common synaptic functions,including excitatory postsynaptic current,pair-pulse facilitation,the transition of short-term memory to long-term memory,and dynamic *** from the high photosensitivity of the 2DP,the devices can be operated under a low operating voltage of0.1 V,and achieve an ultralow energy consumption of~0.29 pJ per *** addition,the heterostructure formed between the 2DP and organic semiconductor enables spectrum-dependent synaptic responses,which facilitates the simulation of visual learning and memory processes in distinct emotional *** underlying mechanism of spectrum-dependent synaptic-like behaviors is systematically validated with in situ atomic force microscopy based electrical *** spectrum-enabled tunability of synaptic behaviors further promotes the realization of optical logic functions and associative *** work inspires the new application of 2DPs in photonic synapses for future neuromorphic computing.

关键词： 2D polymers neuromorphic computing photonic synapses synaptic functions

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Synthesis and application of a novel 9,9-diethyl-1,2-diaryl-1,9-dihydrofluoreno[2,3-d]imidazole for blue organic light emitting diode

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Chinese Chemical Letters 2020年第1期31卷 64-66页

作者： Xueying Wang Zhangcheng Liao Tianqi Wang Haixia Lin Zixing Wang Yongmei Cui Department of Chemistry College of Sciences.Shanghai UniversityShanghai 200444China Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai UniversityShanghai 200072China

Two novel 2-(4-(9,9-disubstitued-9 H-fluoren-2-yl)phenyl)-9,9-diethyl-l-phenyl-1,9-dihydrofluoreno-[2,3-d]imidazole derivatives 2 a and 2 b were synthesized and *** photophysical and electrochemical properties,thermal stability property,and electroluminescence(EL)performance of 2 b were *** fabricated device based on 2 b doping into 4,4’-N,N’-dicarbazole-biphenyl(5%)as an emitter present a maximum brightness of 1272 cd/m^2 at 4 V with the CIE coordinate of(0.1590,0.0465).

关键词： Fluorene Imidazole Photoluminescence Electroluminescence

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A Year Marked by Extreme Precipitation and Floods:Weather and Climate Extremes in 2024

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Advances in Atmospheric Sciences 2025年第6期 1045-1063页

作者： Wenxia ZHANG Tianjun ZHOU Wanheng YE Tingyu ZHANG Lixia ZHANG Piotr WOLSKI James RISBEY Zhuo WANG Seung-Ki MIN Hamish RAMSAY Michael BRODY Alice GRIMM Robin CLARK Kangnian REN Jie JIANG Xiaolong CHEN Shenming FU Lan LI Shijie TANG Shuai HU Key Laboratory of Earth System Numerical Modeling and Application Institute of Atmospheric PhysicsChinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Climate System Analysis Group University of Cape Town Rondebosch Cape Town CSIRO Environment Department of Climate Meteorology & Atmospheric Sciences University of Illinois Urbana–Champaign Division of Environmental Science and Engineering Pohang University of Science and Technology Institute for Convergence Research and Education in Advanced Technology Yonsei University International Agricultural University George Mason University Department of Physics Universidade Federal do Paraná (UFPR) Centro Politécnico da UFPR Met Office Hadley Centre

This past year, 2024, is on track to be the warmest year, joining 2023 as the two hottest years on record. With the exceptional heat, weather and climate extremes were common across the world. In particular, 2024 has seen a remarkable run of extreme precipitation events and resulting impacts. Here, we provide an overview of the most notable extreme events of the year, including extreme precipitation and floods, tropical cyclones, and droughts. The characteristics and impacts of these extreme events are summarized, followed by discussion on the physical drivers and the role of global ***, we also discuss the future prospects in extreme event studies, including impact-based perspectives, challenges in attribution of precipitation extremes, and the existing gap to minimize impacts from climate extremes.

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Double Hilbert transform based nonlinear harmonics correction for fringe projection profilometry

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Optik 2025年 327卷

作者： Wang, Beibei sun, Huanghe Huang, Chaoguang Huang, Wenbin Wang, Haijian Li, Wenjie Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology School of Mechanical and Electrical Engineering Guilin University of Electronic Technology Guilin541004 China Engineering Research Center of Digital Imaging and Display Ministry of Education Soochow University Suzhou215006 China Guilin Kenvin Peter Technology Co. Ltd. Guilin541001 China

Fringe projection profilometry (FPP) has the advantages of large field of view, high precision and resolution, and is widely used in industrial inspection, medical treatment, aerospace and other fields. The nonlinear response between the camera and the projector in the system will affect the sinusoidal intensity of the captured fringe images, produce periodic phase errors, and affect the final reconstruction accuracy. Traditional double N-step phase shift (NPS) and Hilbert transform (HT) methods only correct the fundamental harmonic part of the phase nonlinear errors, and ignore the rest of the higher harmonic. Therefore, a double HTs based nonlinear phase error correction method is proposed, taking the higher order nonlinear harmonics into account. The artificial sinusoidal fringe images without background term are constructed using the wrapped phase calculated by captured fringe images. Then the HT is performed to convert the phase error to multiplication from addition, which can realize error balance in phase calculation. After obtaining the new phase, reoperation of artificial fringe generation and HT (AHT) is carried out to effectively remove the high order harmonic part of nonlinear harmonics. In proposed method, the wrapped phase calculated by captured fringe images is directly used to generate the artificial fringe images, which does not require additional projection patterns and realize real-time correction of phase nonlinear errors with high accuracy. Furthermore, direct artificial fringe generation also can efficiently avoids the effect of background intensity to the HT. Theoretical analysis, simulation analysis and experimental verification all prove the feasibility and superiority of the proposed method. © 2025 Elsevier GmbH

关键词： Harmonic analysis

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Image Coding and Compression Method Based on Semantics of Pixels for Semantic Communication

Image Coding and Compression Method Based on Semantics of Pi...

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IEEE International Conference on Communications in China Workshops (ICCC)

作者： Qizheng Sun Caili Guo Rui Tang Chuanhong Liu Yufeng Zhang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications School of Information and Communication Engineering Beijing China Beijing Laboratory of Advanced Information Networks Beijing University of Posts and Telecommunications School of Information and Communication Engineering Beijing China China Telecom Dict Application Capability Center Beijing University of Posts and Telecommunications

ISBN: (数字)9798350377675

ISBN: (纸本)9798350377682

Semantic image transmission is promising for both image reconstruction or downstream task execution. However, it is still challenging to simultaneously achieve pleasing visual clarity and superior downstream tasks. To tackle this issue, we propose a semantic-preserving image coding and compression method based on the semantics of pixels (SP). Specifically, we first project the semantic importance onto pixels, which is quantified by a gradient-based mechanism. Then, we design an SP-based loss function to train the image coding and compression network. This loss function not only preserves the semantic information to boost the performance of intelligent tasks but also preserves the pixel information to achieve pleasing visual effects. Experimental results confirm improvements in both aspects of performance. Especially for intelligent task performance, the proposed method achieves up to 22.22 % and 78.40 % performance gain ratio compared with the state of art deep learning-based and the traditional method, respectively.

关键词： Training Fading channels Image coding Image communication Semantics Performance gain Visual effects Generative adversarial networks Encoding Image reconstruction

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On the accurate characterization of quantum-dot light-emitting diodes for display applications

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npj Flexible Electronics 2022年第1期6卷 351-362页

作者： Wangxiao Jin Yunzhou Deng Bingbing Guo Yaxiao Lian Baodan Zhao Dawei Di Xiaowei Sun Kai Wang Shuming Chen Yixing Yang Weiran Cao Song Chen Wenyu Ji Xuyong Yang Yuan Gao Shuangpeng Wang Huaibin Shen Jialong Zhao Lei Qian Fushan Li Yizheng Jin Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon MaterialsDepartment of ChemistryZhejiang University310027 HangzhouChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310027 HangzhouChina Department of Electronic and Electrical Engineering Southern University of Science and Technology518055 ShenzhenChina TCL Research ShenzhenGuangdongChina Shenzhen China Star Optoelectronics Semiconductor Display Technology Co. LtdShenzhenGuangdongChina College of Chemistry Chemical Engineering and Materials ScienceSoochow University199 Ren’ai Rd215123 SuzhouJiangsuChina Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University130023 ChangchunChina Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University149 Yanchang RoadShanghai 200072China Najing Technology Corporation Ltd Hangzhou 310052China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacaoSAR 999078China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

Quantum dot light-emitting diodes(QLEDs)are a class of high-performance solution-processed electroluminescent(EL)devices highly attractive for next-generation display *** the encouraging advances in the mechanism investigation,material chemistry,and device engineering of QLEDs,the lack of standard protocols for the characterization of QLEDs may cause inaccurate measurements of device parameters and invalid comparison of different ***,we report a comprehensive study on the characterizations of QLEDs using various *** show that the emission non-uniformity across the active area,nonLambertian angular distributions of EL intensity,and discrepancies in the adopted spectral luminous efficiency functions could introduce significant errors in the device *** errors in the operational-lifetime measurements may arise from the inaccurate determination of the initial luminance and inconsistent methods for analyzing the luminance-decay ***,we suggest a set of recommended practices and a checklist for device characterizations,aiming to help the researchers in the QLED field to achieve accurate and reliable measurements.

关键词： diodes characterization luminous

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