最新刊期
期 1 ， 2017
- 摘要：A tide phenomenon appears when TN-LCD switches from L255 to L0 which shows as the LC response delay at pixel edge and temporary light leakage, and it will affect the product quality seriously. In order to improve the defect we conduct a research. First,according to the regular performance,we confirm that rubbing shadow itself can not lead to defects. Then, we confirm that the defect appears when edge field intensity increases to a certain degree by large number of measured data and electrical experiments. The analysis shows that the defect is the result of the combined action of the rubbing shadow and edge field intensity,the defect ratio decrease from 2.7% to 0.3% by optimizing the relation between Pixel ITO and Data Line.关键词：tide;edge field intensity;rubbing shadow;TFT
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发布时间：2020-07-07 - 摘要：With the purpose of highly precise measuring the phase delay distribution of liquid crystal optical phased array, the accuracy and precision of the measuring method of Fourier Quarter-Plate are both analyzed theoretically and evaluated experimentally. Numerical simulations indicate that the error of this method is smaller than 0.3° when we assumed a couple of ordinary parameters on the system. A practical experiment on a standard half wave plate is also accomplished showing that the accuracy is smaller than 0.3° and the repeat precision is also smaller than 0.3°. Simulations and experiments show a good agreement with each other so that a demonstration Fourier Quarter-Plate method can meet the requirement on phase delay measurement better than 0.5° on liquid crystal optical phased array.关键词：liquid crystal phase delay;phase delay measurement;Fourier transformation;method of quarter plate
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发布时间：2020-07-07 - 摘要：By using nematic liquid crystal elastic theory, we study the director distributions of nematic liquid crystal in hybrid arrangement cylindrical cells. Nematic liquid crystal is restricted in two concentric cylindrical layers, inside and outside surface application strong anchoring and weak anchoring boundary condition, anchor set to boundary conditions of the radial and axial direction(vertical and parallel axis), obtaining four models ZsRw, ZwRs, RsZw and RwZs. Based on the Frank elastic free energy and the Rapini Papoular approximation to the surface anchoring strength, we obtain the director distributions with antagonistic anchoring conditions, different radius and different elastic constants. We calculate and simulate the director orientation graph. Because of the influence of column symmetry, anchoring strength, layer thickness and elastic anisotropy, the director distributions of these four models are very different.关键词：nematic liquid crystals;elastic theory;cylindrical cells;director
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发布时间：2020-07-07 - 摘要：
Advanced Super Dimension Switch (ADS) is a type of wide view TFT-LCD technology and widely used in the commercial TV display in recent years. However, the high Cst(capacitance storage) of ADS technology is the main restriction on Dual Gate GOA 4K TV. In order to maintain the same charging rate in smaller charging time, the pixel needs to reduce the Cst. In this structure, the ADS structure is formed by the overlapping area between the pixel electrode and the common electrode, a coplanar conversion (IPS) str 关键词：ADS;dual gate GOA;4K TV;storage capacitance;dual slit- 98
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发布时间：2020-07-07
Material and Device
- 摘要：Capacitive multi-touch screens using touch predicting and window sensing (TPWS) readout strategy are susceptible to display noise and charger noise interferences. In this paper, a parallel complementary driving and differential sensing method are proposed to improve the SNR of TPWS system. A new 48-channel analog front-end IC is designed and realized using 0.35 μm CMOS process based on the parallel complementary driving and differential sensing method. In addition, an 11.6 in prototype touch screen system is designed to evaluate the performances of the analog front-end IC. The measurement results indicate that, the analog front-end IC designed in this paper can satisfies the requirements of TPWS system for line and point scanning, and furthermore, the SNR of the TPWS system is increased from 25.0 dB to 35.8 dB.关键词：capacitive touch screen;analog front-end IC;sparse readout;parallel complementary driving;differential sensing
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发布时间：2020-07-07 - 摘要：
In order to realize the real-time transmission of the transient signal centralized measurement system, a centralized measurement system based on the PCIe bus is established. The design of the PCIe bus interface of the transient signal centralized measurement system consists of the design of the PCIe slave device and the PC driver. The design of the PC driver is only researched in the paper. NI-VISA and LabWindows development environment are used to design the PC driver program of PCIe bus. First of all, NI- 关键词：transient signal;centralized measurement system;PCIe;VISA;LabWindows- 25
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发布时间：2020-07-07
Driving and Controlling
- 摘要：Image fusion based on compressed sensing belongs to the level of image fusion at pixel level.Traditional image fusion based on DWT compressed sensing is for whole sparse coefficient.Because the coefficient of low frequency is not sparse,the quality of image fusion is bad.Aiming at this problem,this paper proposes the image fusion based on CS of DWT-IRLS.First,the image is decomposed by DWT and the coefficient of high frequency is measured;Then,the coefficient of low frequency and the coefficient of high frequency are fused in different domain,the coefficient of high frequency is reconstructed by IRLS algorithm;Finally,the fused image is obtained through inverse DWT. The experiment shows the fusion effect of 2 group is improved by comparison with four objective evaluation and subjective evaluation.This method can improve the image fusion,it has practical value.关键词：image fusion;compressive sensing;DWT;IRLS
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发布时间：2020-07-07 - 摘要：
Moving target detection technology refers to extracting the change from the video images, and it is widely used in the field of military security, traffic management, video surveillance, medical examination and so on. In order to improve the shortcomings of three-frame-difference method and background subtraction, this paper presents a new moving object detection algorithm based on edge information of the three-frame-difference method combined with the background subtraction. Firstly, the current frame subt 关键词：moving target detection;three-frame-difference method;Gaussian mixture model;Canny edge detection;morphology- 56
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发布时间：2020-07-07 - 摘要：Aiming to the problem of miss distance measurement in the suppression, which generates by the restriction of topographies and movements in the traditional burst points test system, a set of pointing system in air is established, and it is installed on an unmanned plane. By utilizing the external calibration, the internal parameters of the image pickup system are corrected. And then by correction of image plane and target position extraction, the ground points of the projectiles are obtained exactly. The experiment result shows that the imaging size of camera is 727.9 m×352.7 m, which meets the test requirement within 100 m in horizontal and 300 m in vertical. In addition, the precision of camera is 0.1 m when the pixel number is 4 096×2 048, which meets the requirement that the test precision is less than 0.3 m. The proposed method has the theoretical value and the practical significance.关键词：correction of imaging plane;position;image processing;wire surface intersection
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发布时间：2020-07-07 - 摘要：
In order to overcome shortcomings such as the low efficiency and the large calculation of multi-spectral image demosaicking algorithm on MSFA pattern, a new method of spectral image demosaicking algorithm is proposed. First, the equivalence between the problem of demosaicking and the compressed sensing is analyzed. Then a model of the multi-spectral image demosaicking algorithm is given by considering compressed sensing. The discrete cosine transform is used to construct the sparse base of the compressed se 关键词：compressed sensing;multi-spectral image;demosaicing- 54
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发布时间：2020-07-07 - 摘要：
To evaluate the crosstalk phenomenon more reasonably in stereoscopic display systems, weighting and single value evaluation method is applied to traditional gray-to-gray crosstalk. The study selected a large number of three dimensional (3D) images with various types and scenes, and proposed average gray level transition saliency (AGLTS) concept based on probability analysis of each gray level transition and 3D image visual saliency extraction. AGLTS is also existing in matrix form and weighting the traditio 关键词：3D display;visual saliency;gray-to-gray crosstalk;single value evaluation;measurement and evaluation- 26
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发布时间：2020-07-07 - 摘要：In order to realize the precise identification of the missing elements in the field of rice, an image recognition system was constructed. The image acquisition, image segmentation and image classification based on support vector machine are studied in this system. Firstly, image acquisition and processing were carried out according to the phenomenon of deficiency of rice in the field. Then the color features were extracted related to the image of nitrogen elements. On the basis of analyzing and comparing the SVM algorithm to image segmentation, an improved particle swarm optimization algorithm is proposed to optimize the SVM parameters (i.e. IPSO-SVM). At last, the experiment is set up, and the algorithm model is tested and compared with other algorithms. The experimental results show that the accuracy rate of the diagnosis of rice deficiency is 95.45%, which basically meets the requirements of the scientific diagnosis of the deficiency of rice in the field.关键词：image segmentation;support vector machine;particle swarm;deficiency
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发布时间：2020-07-07
Display and Image
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