Journals >Optoelectronic Technology
Contents
2022
Volume: 42 Issue 2
14 Article(s)
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Research and Trial-Manufacture
Research and Design of Touch Control Device Based on HB6096 Bus
Lei LI, Cheng ZHENG, Guangteng WANG, Yun CAO, and Liang DOU
A touch control panel design scheme was proposed based on the capacitive touch screen. The HB6096 bus was used as the data transmission interface between the touch control panel and the on-board interactive equipment， and the FPGA was used as the main control chip.The control circuit received data from the capacitive tA touch control panel design scheme was proposed based on the capacitive touch screen. The HB6096 bus was used as the data transmission interface between the touch control panel and the on-board interactive equipment， and the FPGA was used as the main control chip.The control circuit received data from the capacitive touch screen through the I2C interface， packed and transmitted the data to the interactive interface through the driver， and finally realized the cursor movement and clicked selection functions on the display screen..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 95 (2022)
Monocular Vision SLAM Algorithm Based on GNSS Fusion
Dingzhou HE, Hongbin MU, Shuo WANG, Dunliang SHEN, and Yong ZHU
Aiming at the problems that the monocular visual SLAM （Simultaneous Localization and Mapping） algorithm could not recover the geographic scale information and the accumulation of pose estimation errors is large， a monocular vision SLAM algorithm based on GNSS fusion has been proposed. Based on the graph optimization thAiming at the problems that the monocular visual SLAM （Simultaneous Localization and Mapping） algorithm could not recover the geographic scale information and the accumulation of pose estimation errors is large， a monocular vision SLAM algorithm based on GNSS fusion has been proposed. Based on the graph optimization theory， the algorithm built a similarity transformation estimation model in the visual odometry to solve the real scale， added the GNSS global location node in the back-end optimization， designed the optimization solution strategy， and improved the key frame pose and 3D map point position estimation. Finally， at the end of the sequence， the global map was iteratively optimized offline to ensure the global consistency of map construction. Experiments showed that in the outdoor environment， when the motion trajectory was within 5 km， the scale estimation error of the method proposed in this paper was within 0.1%， and the trajectory error was within 2 m， which could meet the needs of practical applications..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 100 (2022)
Optimization of Anti‑vibration Design for PCB of Airborne Electronic Equipment
Guangming TANG, Yajun SHAN, Libang SHU, and Chen SHENG
In airborne vibration environment， the dynamic simulation analysis and experimental study of the PCB and its installation panel were carried out. The influence of different reinforcement design methods on the vibration response of the chip on the PCB of airborne electronic equipment was summarized， and it was concludedIn airborne vibration environment， the dynamic simulation analysis and experimental study of the PCB and its installation panel were carried out. The influence of different reinforcement design methods on the vibration response of the chip on the PCB of airborne electronic equipment was summarized， and it was concluded that adding rubber shock absorber at the mounting hole was the most effective way to reduce the vibration response of the chip on the PCB. The research and analysis above could guide the layout and installation structure design of PCB electronic devices..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 107 (2022)
Research on Low‑light‑level Imaging System Based on FPGA
Shaosu HUANG, Wenming CHEN, and Jian SHEN
Under the condition of extremely low illumination， the images collected by the low-light CMOS image sensor generally has the problems of excessive noise， deviation of brightness， and difficulty in updating the system program after assembly. In view of this， a low-light-level imaging system，including hardware and logic，Under the condition of extremely low illumination， the images collected by the low-light CMOS image sensor generally has the problems of excessive noise， deviation of brightness， and difficulty in updating the system program after assembly. In view of this， a low-light-level imaging system，including hardware and logic， was designed and built， by using an image signal processing module with FPGA as the core， and combining with image acquisition module， interface module， optical lens， GAMMA correction， image filtering processing algorithm and MultiBoot. Related experimental results showed that the low-light-level imaging system could control the low-light-level CMOS image sensor through FPGA to collect low-light images under different illuminations. The host computer could use the serial port to update the FPGA program through the online loading function. It was testified that in the environment of 0.001 lux， the output low-light image resolution was not less than 1.0 mrad， the image could realize information interpretation， and the results could help solve the problem that the human eye could not obtain information at night..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 112 (2022)
Design and Fabrication of Volume Holographic Grating in Planar Waveguide System
Qibin FENG, Liye XU, Le ZHANG, Biao ZHU, Ye YUAN, Xinjun YANG, and Guoqiang LYU
An asymmetrical reflection VHG with large angular bandwidth and high diffraction efficiency was designed. The relationship between the recording angles and the diffraction efficiency was discussed at first and several combinations of the recording angles were found. The relationship between the recording angles and theAn asymmetrical reflection VHG with large angular bandwidth and high diffraction efficiency was designed. The relationship between the recording angles and the diffraction efficiency was discussed at first and several combinations of the recording angles were found. The relationship between the recording angles and the angular bandwidth was furtherly analyzed， which could obtain the optimal recording setup. The experimental results showed that when the incident angle of the reference light and signal light was 10° and 59°， the angular bandwidth of the fabricated VHG could reach 24° and the diffraction efficiency 90%. However， the wavelength shift could happen. The recording angle was modified to improve wavelength shift. The method proposed could help design a VHG with large angular bandwidth and high diffraction efficiency and present great practical value..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 119 (2022)
Heat Dissipation Optimization Method for the Backlight Module of High⁃brightness Rugged Display
Yajun SHAN, Guangming TANG, Chen SHENG, and Qiubai YAN
A heat dissipation optimization method was proposed for the backlight module of the high-brightness rugged display by improving interface materials，designing low thermal resistance heat dissipation path and optimizing parameters of the cooling grid， through the analysis of the internal heat dissipation environment of tA heat dissipation optimization method was proposed for the backlight module of the high-brightness rugged display by improving interface materials，designing low thermal resistance heat dissipation path and optimizing parameters of the cooling grid， through the analysis of the internal heat dissipation environment of the rugged display. A certain type of ruggedized display was taken as the research object， and the heat dissipation performance between the original design and optimized design was compared.The results showed that the working temperature of the LED on the backlight module was greatly reduced after applying the proposed heat dissipation method..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 123 (2022)
Study on Developing Process of Large‑size Mask
Huachao ZHANG, Xiang GE, and Qilong XIONG
The Spray development spray mode and Slit development spray mode in the production process of large-size mask were compared and analyzed. Through experiments and production process monitoring， the advantages and disadvantages of the two development spray modes were obtained. Through comprehensive comparison， it was conThe Spray development spray mode and Slit development spray mode in the production process of large-size mask were compared and analyzed. Through experiments and production process monitoring， the advantages and disadvantages of the two development spray modes were obtained. Through comprehensive comparison， it was concluded that Slit development spray mode was better in the production process of mask plate..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 129 (2022)
High Efficiency Illumination Light Path Design of Projection Display Based on Fresnel Lens
Yuan WU, Yujun ZHOU, Liang HU, and Jin WANG
In projection display technology，optical engine is an important component，and its key parameters of light efficiency and homogenization，etc. could directly affect the final performance of the projection display system. In this paper，LED was used as the lighting source and Fresnel lens was used as the uniform light deviIn projection display technology，optical engine is an important component，and its key parameters of light efficiency and homogenization，etc. could directly affect the final performance of the projection display system. In this paper，LED was used as the lighting source and Fresnel lens was used as the uniform light device. The illumination light path with high light efficiency and high homogenization was designed，providing a reference of the follow-up research..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 133 (2022)
Research and Improvement of Black Uniformity in Automotive TFT‑LCD Module
Junping BAO, Xinbo YU, Bing XU, Chao WANG, Xi XIANG, Xiaofei YANG, Yang LI, and Ning LUO
Based on reducing module stress， the effects of process， materials and design on black uniformity were studied systematically， and the method was determined that could meet the specification of area-scan 70%. The experimental results showed that by 1） design adopted thinned panel （0.4 mm） and cover glass （1.3 mm）； 2）thBased on reducing module stress， the effects of process， materials and design on black uniformity were studied systematically， and the method was determined that could meet the specification of area-scan 70%. The experimental results showed that by 1） design adopted thinned panel （0.4 mm） and cover glass （1.3 mm）； 2）the materials used polarizers that top and bottom materials were the same， liquid optical clear resin， and low temperature ACF； 3）VAS process reduced the running speed of the lift bar， in this way， the black uniformity on automotive TFT-LCD module area-scan could be increased to 70%..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 138 (2022)
Design of Display and Control System of Airborne LCD Monitor Based on Zynq
Cheng ZHENG, Ke GU, Wei ZHANG, Guangteng WANG, and Pengpeng ZHONG
A display and control system of airborne LCD monitor based on Zynq platform was designed. This system synthesized various functions，such as backlight， key handling， temperature acquisition， low temperature heating， serial communication， instrumental interface display， display driver， etc. It adopted the hardware and soA display and control system of airborne LCD monitor based on Zynq platform was designed. This system synthesized various functions，such as backlight， key handling， temperature acquisition， low temperature heating， serial communication， instrumental interface display， display driver， etc. It adopted the hardware and software co-design to partition these functions， and took full advantages of the ability of parallel data processing of FPGA in Zynq platform and the flexible and efficient embedded programming model of ARM. Finally， the experiment results demonstrated that the designed system could operate well and all the functions could satisfy the predesigned requirements， which implied the potential engineering value..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 143 (2022)
Optical Correction Method and Design Verification of VRR Panel
Keming YANG, Yizhen XU, Zhenghong CHEN, Zhicong KANG, Yilin PIAO, and Chunhui REN
An optical correction method applied to VRR TFT LCD panel was proposed. Based on the influence of timing and voltages （VGH/VGL/VCOM） on the VRR TFT LCD panel optics， the two parameters were optimized. T-Con ACC optical compensation function could be used to correct the optical data differences between minimum rate and An optical correction method applied to VRR TFT LCD panel was proposed. Based on the influence of timing and voltages （VGH/VGL/VCOM） on the VRR TFT LCD panel optics， the two parameters were optimized. T-Con ACC optical compensation function could be used to correct the optical data differences between minimum rate and maximum rate，thus reducing the optical fluctuation of the panel during the refresh rate. The experimental results showed that the VRR TFT LCD panel showed better optical performance after optical correction..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 148 (2022)
Research and Improvement of Edge Color Dot Mura in TFT‑LCD
Shuai CHEN, Xian ZHANG, Wenqiang WANG, Zhuo CHEN, Yonghui WEI, Jianwei GUO, and Xingang HE
Edge color dot Mura appeared and became more severe as the light or boot screen lasted longer. In order to improve edge color dot Mura defect of panel and improve the quality of the company's products， the effective improving measurements of edge color dot Mura was summarized， including pixel design， manufacturing Edge color dot Mura appeared and became more severe as the light or boot screen lasted longer. In order to improve edge color dot Mura defect of panel and improve the quality of the company's products， the effective improving measurements of edge color dot Mura was summarized， including pixel design， manufacturing process， materials and so on. Finally， through the measurements above， the incidence of edge color dot Mura defect was reduced from 35% to 0， which could effectively improve the yield of products..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 154 (2022)
Technology and Measurement
Φ‑OTDR‑based On‑line Monitoring Method for Overhead Transmission Line Icing
Fei XIONG, Zhenhua XING, Yixin ZHANG, Dao ZHANG, Yaze CHEN, Xing FANG, Xuping ZHANG, and Feng WANG
The finite element model of the overhead conductors was established and the modal analysis was carried out with the ANSYS finite element analysis software. The results showed that the natural frequencies of various vibration modes of the overhead conductors decreased with the icing thickness increasing. A method for meThe finite element model of the overhead conductors was established and the modal analysis was carried out with the ANSYS finite element analysis software. The results showed that the natural frequencies of various vibration modes of the overhead conductors decreased with the icing thickness increasing. A method for measuring the natural frequency of overhead conductors based on the phase-sensitive optical time domain reflectometer （Φ-OTDR） was proposed， with which the on-line monitoring of overhead transmission line icing could be realized. A transmission line icing simulation device was built. The test results of a commercial Φ-OTDR showed that the small-amplitude vibration frequency of the suspended line was only related to system properties， not external excitation. The natural frequency of the suspended line decreased with the increasing number of the coating layers， which showed excellent monotonic relationship. It was testified that this method could provide a reliable solution for on-line monitoring of overhead transmission line icing..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 81 (2022)
Research on TFT‑LCD Life Test for 3D Printing
Shian ZHANG, Zhongbo YANG, Caiyou CHEN, Xianlong FU, Huizhong ZHU, and Chengqun WANG
Typical light-curing 3D printing LCD products were taken as the research object. Through the collection of bad information from the clients， the key characteristics of LCD that could affect the light curing function of the whole machine were identified and the failure threshold was determined. The life evaluation methoTypical light-curing 3D printing LCD products were taken as the research object. Through the collection of bad information from the clients， the key characteristics of LCD that could affect the light curing function of the whole machine were identified and the failure threshold was determined. The life evaluation method was used based on product performance degradation to carry out the experimental design and implementation. Through the distribution test， Weibull probability paper method， model regression and fitting， the reliability， cumulative failure probability， and failure rate of the product could be found， which was expected to provide technical guidance on maintenance..
Optoelectronic Technology
- Publication Date: Jun. 28, 2022
- Vol. 42, Issue 2, 89 (2022)
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