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2024 Conference on Spectral Technology and applications, CSTA 2024

作者： Xu, Tingting Li, Xin Zheng, Longhao Wang, Kexin Huang, Lingling Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology Beijing100081 China MOE Key Laboratory of Photoelectronic Imaging Technology and System MIIT Key Laboratory of Photonics Information Technology School of Optics and Photonics Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781510683082

Computer-generated holography (CGH) is one of promising technologies in wavefront engineering, and multiplexing holography brings more information channels. Inspired by code division multiplexing (CDM) in communications, CDM holography demonstrate its feasibility to recording independent images with high-density in a single hologram. Here, we design CDM holograms with nonorthogonal coded beams as illumination light to record the optical information of both binary and gray-level target images. The results exhibit that optimization in CDM holography ensures a low-level cross talk between each channel. Also, it is difficult for eavesdroppers to decode any information of coded illuminations. Such a large number of information channels and its outstanding features can offer high security for optical data. © 2024 SPIE.

关键词： Holograms

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Single-Celled Metasurface Full-Color Holography by Independent Phase Control at RGB Wavelengths

Single-Celled Metasurface Full-Color Holography by Independe...

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2024 Conference on Spectral Technology and applications, CSTA 2024

作者： Zhang, Xiaotong Li, Xin Huang, Lingling Wang, Yongtian Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and Photonics Beijing Institute of Technology Beijing100081 China MOE Key Laboratory of Photoelectronic Imaging Technology and System MIIT Key Laboratory of Photonics Information Technology School of Optics and Photonics Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781510683082

Color holographic display is one of the most promising future display technologies. Introducing metasurfaces to holographic display brings more possibilities. Spatially multiplexing multicolor holography is a common way and it has lower resolution and irreducible noise. In order to realize full color metasurface holography, we elaborately design a metasurface in which each unit structure can independently manipulate the phase at three wavelengths of red, green and blue (RGB). The computer-generated holograms (CGH) of RGB components are obtained firstly, and the phase modulation of G-CGH is based on geometric phase, and the phase difference between R-G CGH and B-G CGH are based on the propagation phase, hence a full-color hologram can be reconstruct without relying on spatial multiplexing. Our work would have important implications for color holographic projection, near-eye displays, and multi-wavelength control. © 2024 SPIE.

关键词： Holograms

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Improved Properties of A-Igzo Tft with Inorganic/Organic Stacked Passivation Layer

SSRN

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SSRN 2022年

作者： Chen, Longlong Peng, Cong Xu, Meng Yang, Shibo Li, Xifeng Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai200072 China

High perfomance a-IGZO TFTs device is fabricated with inorganic / organic stacked layers as passivation layer (PL). The designed bilayer passivation layer structure exhibits extraordinary barrier characteristics to environment humidity. The off-state current of oxide TFTs is reduced for one order (at 10-13), and the negative bias illumination stress (NBIS) of device exhibits an excellent stability after one year of ambient storage which the ΔVth is lower than 0.1 V. The manufacture process of stacked layers is simple and low cost than traditional vacuum process which is promising substitute for SiO2-PL by PECVD. © 2022, The Authors. All rights reserved.

关键词： Passivation

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A Generic Image Feature Extraction Method Towards Multiple Vision Tasks 9th

A Generic Image Feature Extraction Method Towards Multiple V...

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9th International Forum on Digital Multimedia Communication, IFTC 2022

作者： Wei, Jiao An, Ping Huang, Kunqiang Yang, Chao Ma, Ran School of Communication and Information Engineering Shanghai University Shanghai200444 China Key Laboratory for Advanced Display and System Application Ministry of Education Shanghai200072 China

ISBN: (纸本)9789819908554

With the developments of artificial intelligence and image processing technology, the study of multiple vision tasks has become a hot topic in the field of computer vision, and the key to implementing vision tasks lies in the feature extraction of images. To meet the demands of modern life for multiple vision tasks and promote the deployment of artificial intelligence on edge devices, we propose an image feature extraction method applied to multiple vision tasks, which promotes the deployment of artificial intelligence on edge devices. Firstly, the function of the secondary task in multi-task learning is combined with a feature migration strategy to build a feature migration model for multiple vision tasks. Then, a generic feature extraction model based on feature fusion and feature migration is established under the guidance of image classification. The experimental results show that the proposed feature migration model with image classification as the secondary task can improve the mAP (mean average precision) of the target detection by 5.5%, and the feature migration model with target detection as the secondary task can improve the average accuracy of the image classification by 1%. The proposed generic feature extraction model can effectively implement the image classification and target detection tasks. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Feature extraction

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A Novel Voltage-Controlled Oscillator Suitable for Silicon-Based Microdisplay Driver Clock

A Novel Voltage-Controlled Oscillator Suitable for Silicon-B...

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

作者： Maoxiang Xu Jianhua Zhang Aiying Guo Key Laboratory of Advanced Display and System Applications (Ministry of Education) Shanghai University Shanghai China

In order to provide silicon microdisplay drivers a wide tuning range clock and solve the problem that the tuning range of VCO is not wide enough, a wide tuning range multi-band feedforward differential delay cell based on CMOS inverter is proposed in this paper. The cell achieves the wide-tuned multi-band effect by adjusting the control voltage (VCTRL) and the control voltage sequence bits. In the HLMC 55LP process, the differential VCO can be adjusted from 3.92GHz to 8.63GHz to achieve a wide tuning range of multi-band output with a FOM of −157.02dBc/Hz.

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Thick films of polymer Direct-conversion X-ray detectors 23

Thick films of polymer Direct-conversion X-ray detectors

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23rd IEEE Electronics Packaging Technology Conference, EPTC 2021

作者： Chen, Hu Li, Yi Hao, Zhao Wu, Xingyang Zhang, Jianhua Shanghai University Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai200040 China Shanghai University School of Microelectronics Shanghai201800 China

ISBN: (纸本)9781665416191

Organic conjugated polymers have been widely used in the field of X-ray detectors because of their simple processing, mechanical flexibility and low cost. In this paper, we report a vertical structure X-ray detector using PDMS material which is fabricated by simple process steps. The response of pure PDMS material to X-ray is verified, and the effects of different process conditions on the device performance were tested. The detector with film forming speed 2000 rpm and curing temperature 60C still has high sensitivity left (434.5 mu {CGy}_{ {air }}{-1} {cm}{-2}right) to low dose rate left(23.9 mu {Gy}_{ {air }}{S}{-1}right) when the applied bias voltage is 150 V. Finally, the device provides an idea for the development of low cost and high performance flexible direct X-ray detectors. © 2021 IEEE.

关键词： X ray detectors

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Mechanical Properties of Flip-Chip Bonding Structures for Micro-Led Devices: Cu-Cu Bonding with Passivation Layer and Indium Bumps Bonding

Mechanical Properties of Flip-Chip Bonding Structures for Mi...

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2023 China Semiconductor Technology International Conference, CSTIC 2023

作者： Wang, Kefeng Chen, Zehua Ji, Xiaoxiao Yin, Luqiao Lu, Xiuzhen Zhang, Jianhua School of Microelectronics Shanghai University Shanghai201800 China Shanghai University Ministry of Education Key Laboratory of Advanced Display and System Applications Shanghai200072 China School of Mechatronic Engineering and Automation Shanghai University Shanghai200072 China

ISBN: (纸本)9798350311006

A traditional bonding structure with indium bumps and a new bonding structure with passivation layer using Cu bumps were simulated to bond Micro-LED and substrate. Anand model and bilinear isotropic hardening model were used to characterize the viscoplastic behavior of In and the plastic behavior of composite structure simplified from the combination of Cu and Au, respectively. Mechanical properties of two kinds of micro-display devices with different bonding structures were analyzed by the ANSYS finite element method and the thermo-mechanical coupling field. The deformation and stress of the micro-display device using Cu-Cu bonding structure with passivation layer are reduced by 19.5% and 59.1% compared with the device bonded by In bumps. © 2023 IEEE.

关键词： display devices

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Fabrication and Study of Micro-LED Quantum Dot Color Conversion Layer Based on Inkjet Printing 20

Fabrication and Study of Micro-LED Quantum Dot Color Convers...

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20th China International Forum on Solid State Lighting and 9th International Forum on Wide Bandgap Semiconductors, SSLCHINA: IFWS 2023

作者： Wang, Xinyi Zhou, Haojie Ji, Xiaoxiao Yin, Luqiao Zhang, Jianhua School of Microelectronics Shanghai University Shanghai200444 China Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai200072 China School of Materials Science and Engineering Shanghai University Shanghai200072 China

ISBN: (纸本)9798350385373

In this study, red and green quantum dot color conversion layer was successfully fabricated using inkjet printing (IJP) technology on a blue micro-light-emitting diode (Micro-LED) backlight. To reduce the optical crosstalk between different sub-pixels, a black matrix (BM) layer with a thickness of 15 μm was proposed. Furthermore, to protect quantum dots (QDs), a SiO2 passivation layer with a thickness of 3 nm was uniformly deposited on the entire pattern by Atomic Layer Deposition (ALD). Subsequently, a pixel array featuring a sub-pixel size of 37.5 μm and a line width of 2 μm was fabricated on the BM layer treated with Reactive Ion Etching (RIE), and the thickness of the QDCC layer was controlled by RIE. The external quantum efficiencies of the red and green QDCC layer were 12.9% and 18.2%, respectively, and the emission spectra had blue light being transmitted, accompanied by a slight redshift. This research addresses the gaps in display applications and holds promise for the future advancement of Micro-LED display technology. © 2023 IEEE.

关键词： Atomic layer deposition

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Simulation Study on Electrothermal and Mechanical Coupling of Bumps in 5×5 Micro-LED Array 20

Simulation Study on Electrothermal and Mechanical Coupling o...

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20th China International Forum on Solid State Lighting and 9th International Forum on Wide Bandgap Semiconductors, SSLCHINA: IFWS 2023

作者： Yang, Zhu Fu, Hao Wang, Kefeng Ji, Xiaoxiao Chen, Liang Yin, Luqiao Lu, Xiuzhen Zhang, Jianhua School of Microelectronics Shanghai University Shanghai201800 China Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai2000072 China School of Mechatronic Engineering and Automation Shanghai University Shanghai2000072 China

ISBN: (纸本)9798350385373

As a frontier research field of next-generation display technology, Micro-LED technology has the advantages of high brightness, high contrast and high energy efficiency. With the development trend of high-power, multi-array LEDs, the research on thermal stability of LEDs is gradually deepened. In order to explore the thermal stability of bumps during the working of Micro-LED, COMSOL Multiphysics simulation software and finite element method were used to analyze the electrothermal and mechanical coupling of bumps in 5×5 Micro-LED array in this paper. Flip-chip bonding was employed for interconnection of Micro-LED array and Si driver chip with the gap except Micro-LED devices between sapphire and silicon substrate filled with underfill to alleviate the stress concentration. The effects of different filling materials, applied current densities, and dimensions of In bumps (cylindrical) on thermal stress and displacement of the Micro-LED array were analyzed in detail. The results show the stress and displacement of the bumps with polyimide (PI) underfill were the smallest than that of bumps with benzocyclobutene (BCB) and epoxy resin (EP) underfill. Additionally, the temperature, thermal stress, and displacement of the bumps were also affected by the applied current density and the size of the bumps. © 2023 IEEE.

关键词： Light emitting diodes

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A Method of Constructing and Automatically Labeling Radio Frequency Signal Training Dataset for UAV 48

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

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48th IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2023

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

ISBN: (纸本)9781728163277

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%. © 2023 IEEE.

关键词： Object detection

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