最新刊期
期 2 ， 2017
- 摘要：
In order to realize color gamut extension and white balance of backlight source in liquid crystal displays, this paper researches light mixing theory of quantum-dot backlight in CIE1931 chromaticity system by using Gaussian curve fitting spectrum, and establishes spectral function model of quantum-dot backlight source, and further proposes a conversion method between quantum-dot spectrum and color coordinates. First, based on maintaining effective spectral information, the complex spectral data is fitted to 关键词：quantum dot;LCD backlight;light spectrum;color coordinates;color gamut- 79
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发布时间：2020-07-07 - 摘要：
In this article, an advanced optical thin film structure for spatially modulating light propagation directions and polarizations is introduced. The optical structure is composed of multi-layer patterned birefringence thin films, of which each thin film is formed by a liquid crystal (LC) polymer layer with spatially varying optical axes controlled by a patterned photoalignment layer. The optical modulator has two functional layers, where the first layer is designed as patterned polarization grating with spat 关键词：liquid crystal;polymer thin film;polarization grating;light modulator;patterned photoalignment- 64
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发布时间：2020-07-07 - 摘要：Degradation behavior and degradation mechanism of bridged-grain (BG) polycrystalline silicon thin film transistors (TFTs) under AC gate bias stress are studied and investigated. It is found that dynamic hot carrier (HC) effect dominates the device degradation. The degradation is only related to gate pulse falling time (tf). Faster tf brings larger dynamic HC degradation. Compared with normal poly-Si TFTs, the dynamic HC degradation of BG poly-Si TFTs under the same stress is greatly reduced. By selectively doping the active channel, the multiple PN junctions inherent can effectively share the voltage drop, resulting in better dynamic HC reliability. Based on transient simulations, the related degradation mechanism is clarified. All test results indicate that such high-performance and highly reliable BG poly-Si TFTs have great potential in system-on-panel applications.关键词：bridged-grain;polycrystalline silicon;thin film transistors;AC gate bias stress;dynamic hot carrier
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发布时间：2020-07-07 - 摘要：
In order to analyze the transmittance property of the liquid crystal spectro-polarimetric system, the research simulates the distribution of transmittance spectrum in the visible spectrum.The transmittance spectrum of liquid crystal polarizer is obtained based Berreman matrix. Meanwhile, by combining Lyot liquid crystal tunable filter and liquid crystal variable retarder, the transmittance spectrums of system are investigated with different polarization states in normal incidence and oblique incidence. The 关键词：transmittance spectrum;liquid crystal spectro-polarimetric system;Berreman matrix;Lyot liquid crystal filter- 112
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发布时间：2020-07-07 - 摘要：
In production of pure Al film in TFT array, hillock which will seriously affect the electrical properties and yield of the products often forms around the glass substrate after replacing the cleaning spare parts of the trays. In factory, a method is shown to quickly identify and compare the formation of hillock, which include using a commonly used machine on the production line called array macro-micro defect inspection machine to observe the surface of pure Al film and then save the pictures which will be 关键词：pure Al films;hillock;MATLAB;magnetron sputtering;residual gas- 52
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发布时间：2020-07-07 - 摘要：Particle Gap is a common defect in TFT-LCD field, however, there was no mature method to repair it. In this paper, firstly, particle gap formation mechanism was studied and based on the mechanism, the model of repair method was established and proved by experiments. Two repair methods of one product particle gap were studied, the success ratio of laser cracking method and pressing method were 30% and 70%, respectively. By analyzing repair effect actors, experiment results indicated that:in laser crack change method, particle position in pixel was the most important actor when laser power was optimized from 4 μJ to 10 μJ. In pressure shape change method, particle height was the most important actor when pressure was optimized from 30 N to 50 N. Based on repair model and effect actor analysis, a product was repaired and the success ratio reached to 79%.关键词：particle gap;crack change;shape change;repair success ratio;effect actors
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发布时间：2020-07-07
Materialand Device
- 摘要：In order to solve problem of displaying different kinds of input video on LCD, an LCD controller based on FPGA which supports different kinds of video is designed. The system frame is formed of different IP cores. The system CPU is Xilinx Microblaze soft core, which is used to control the IP core. The communication between PC and microblaze use the UART core. In order to survey the signals in the FPGA to identify the logic, the Xilinx integrated logic analyser IP core ILA is used to survey the critical signals. The result shows that the designed LCD controller based on IP core can drive the LCD, the system supports several video ports. The displaying picture is stable, which can be used as PC displaying device or displaying other videos.关键词：FPGA;Video port;LCD controller;IP core;ILA
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发布时间：2020-07-07 - 摘要：Electron multiplying charge-coupled-device (EMCCD) in Hartmann wavefront sensor (WFS) makes the SNR higher than the ordinary CCD. However, a fixed EM gain may not work when the brightness of the observed target changes in large ranges within a few minutes. Thus, an adaptive control method of the Hartmann WFS' gain is proposed. The control value is the average of the maximum signals of all the light spots in a frame. The goal value for control is predetermined based on the linear relation of the signal with the EM gain and the number of photons collected in sub-apertures. The self-protection for brightness super saturation of the EMCCD has to be considered for the goal value. Simulations and experiments indicate that the proposed control method keeps the sensing in a high SNR without the self-protection of the EMCCD occurred even when the target brightness changes in sine curves.关键词：adaptive control;EM gain;Hartmann wavefront sensor;electron multiplying CCD
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发布时间：2020-07-07 - 摘要：In order to realize the state control and real-time display of the laser ranger finder on the 3 m high-board, a control box of LCD is designed. Along with the triggering of a self locking button, the motor would switch the pattern of ranging and indicating by leading the crystals for frequency doubling. Also, some non self locking keys are used to change the time synchronization and the different frequency. At the same time, the basic states such as the power state, the temperature controlling state, the Q-modulation state, the high-voltage state, the main wave state, the echo wave state and the drive current as well as the capacitor voltage of the laser ranging finder are on the real-time display and monitor. Experimental results indicate that the control box can work stably to switch the patterns, avoid the spurious triggering, and display the states of the laser ranger finding to make sure the regular function.关键词：liquid-crystal display;control box;laser ranger finding
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发布时间：2020-07-07
Driving and Controlling
- 摘要：In order to realize the moving objects detection on the satellite video, an algorithm based on background subtraction method and actual physical constraints are proposed. First, we establish a background model representation of the scene. Then each frame compares with the model and makes a subtraction operation. The result is the motion region. Finally, we use actual physical constraints to reduce the noise because moving objects' pixels can be estimated by satellite's resolution ratio. We accomplish our method in PC, and compare their accuracy. Experimental results indicate that our method's accuracy is 83.6%, three-frame difference method's accuracy is 6.1%, background subtraction method's accuracy is 21.0%. It can satisfy our method can accurately detects moving objects on satellite video.关键词：satellite video;moving objects detection;three-frame difference method;background subtraction;actual physical constraints;Jilin-1
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发布时间：2020-07-07 - 摘要：To further improve the registration precision of color remote sensing image, an improved SURF registration algorithm is put forward aiming at solving the problem of low utilization rate of color information. Firstly, based on the detection of feature points, a modified descriptor was constructed adding in color information got with color space transformation; then the normalized processing for the modified descriptor was done to increase its uniqueness and robustness to rotation, scale and illumination; finally, by trace of Hession matrix to improve precision, the correct matching points could be acquired through the Euclidean distance ratio. And the registered image was obtained based on parameter estimation and interpolation processing. Experimental results show, compared with the original SURF algorithm, that the improved algorithm has certain improvement in terms of accuracy and stability while guaranteeing the real time. It has certain values in both theory and practice.关键词：color remote sensing image;SIFT;SURF;modified descriptor;trace
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发布时间：2020-07-07 - 摘要：
In order to solve the problem of target scale change, occlusion, illumination change, similar target confusion in target tracking, the paper proposes multi-template collaborative correlation tracking by multi-feature fusion algorithm. First, this paper constructs the target appearance model with various features, improves the robustness of the target model, and enhances the ability of anti deformation and the ability of light variation. Then, the fixed-point optimization strategy is used to solve the multi 关键词：machine vision;object tracking;multi-template collaborative filter;multi-feature fusion- 63
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发布时间：2020-07-07
Display and Image
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