最新刊期
期 3 ， 2017
- 摘要：Polymer stabilized blue phase liquid crystal display (PS-BPLCD) is difficult to be used in production because of its high operating voltage and hysteresis effect. In this paper, we analyzed the reason of the high operating voltage of BPLCD based on the relationship between the electric field and electric displacement in electrodynamics and the dielectric constants of every material used in BPLCD. The reason is that the dielectric constant of polymer and insulator layer's material is far less than that of blue phase liquid crystal. The operating voltage of PS-BPLCD can be obviously reduced by increasing the dielectric constant of polymer and insulator layer's material. The results show that the operating voltage is reduced to the half when the dielectric constants of polymer and insulator layer's material reach the average dielectric constant of liquid crystal. These results have promotion effect in the industrialization of PS-BPLCD.关键词：blue phase liquid crystal display;high dielectric material;operating voltage;hysteresis effect
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发布时间：2020-07-07 - 摘要：The spectra of color filter and back light are important factors that affect color gamut in display area. In order to achieve higher color gamut (BT2020) in TFT-LCD area, we developed a novel quantum dot resist which can displace color filter and improve color pure. This quantum dot resist could be patterned through photo process including cleaning, coating, exposure, developing and post bake. The result indicates that quantum dot resist can achieve higher color gamut than quantum dot BLU.关键词：quantum dot;photo resist;pattern;high color gamut;display
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发布时间：2020-07-07 - 摘要：Panel stain is a common defect in the production of Thin Film Transistor-Liquid Crystal Display. It directly deteriorates the image quality of products and reduces the product level and sale price. The study shows that the impurities which contain Si element cause a large number of panel stains. Lower TFT surface roughness can reduce impurities and remove impurities easily. By improving the cleaning ability after rubbing, we also can effectively remove residual impurities on the substrate to reduce the ratio of panel stain. In addition, the C-series RUB Cloth can produce fewer impurities in rubbing process. All those 3 actions decrease the panel stain ratio of 55 Inch UHD Product from 8.2% to 0.2%.关键词：panel;panel stain;clean;rubbing cloth;impurities
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发布时间：2020-07-07 - 摘要：Recently, liquid crystal (LC) with its promising electro-optical characteristics arouses the interest in many non-display applications, such as the wavefront corrector in adaptive optics, atmospheric turbulence simulator, and optical steering as a optical phased array. In these applications, the key LC parameters include its response time, phase stroke and dispersion. In the paper, we focus on these key parameters and report the advancement of theoretical calculation algorithms in LC optimal parameters design, driving improvement and LC dispersion description. And these are valuable and helpful to improve the LC device design and estimate their electro-optical properties.关键词：liquid crystal;phase modulation;adaptive optics;response time;dispersion
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发布时间：2020-07-07 - 摘要：In this paper, four factors have been experimented and analyzed theoretically,which will influence the adhesion between photoresist and the substrate in LTPS process. It is found that the substrate material and roughness and the molecular weight distribution in the photoresist are the two most important factors that affect the adhesion between photoresist and the substrate. In terms of improving adhesion, HMDS makes better performance in improving the adhesion between strong electronegativity metal substrate and photoresist,while has obvious improvement effect in SiNX,A-Si and P-Si substrate,and without any difference among them. But there is no improvement in ITO. Properly extending the baking time can also effectively improve the adhesion between photoresist and the substrate after the photoresist has been coated.关键词：adhesive force;photoresist;Mo;Ti;ITO;Poly-Si;A-Si;SiNX
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发布时间：2020-07-07 - 摘要：Based on the Landau-de Gennes theory, the influence of electric field on the state of liquid crystal (LC) within the thin vertical aligned (VA) cell and the thin inverse twist nematic (ITN) cell has been investigated, using the relaxation iterative method. Two systems have the same tilt angle behavior under the same electric field and same cell gap. Meanwhile, the variation of biaxialities and eigenvalues only depend on the tilt angle. When the cell gap is bigger than a critical gap, the LC system has positive order parameter, and the twist angle of ITN changes from lineation to nearly 45° with the increase of electric field. When the cell gap is under the critical value, a negative order parameter uniaxial state will appear at a certain electric field. The variation of the twist angle in the ITN cell shows a deviation from lineation as the electric filed increasing, and this variation will show a hysteresis effect within a certain electric field range.关键词：Landau-Gennes theory;negative order parameters uniaxial state;eigenvalue exchange;critical cell gap
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发布时间：2020-07-07
Material and Device
- 摘要：
For detecting optical performance of space remote sensing spectrometer, the ground testing system is designed and implemented. The system consists of hardware and control software. The hardware consists of light source, mechanical motion subsystem, signal acquisition subsystem and computer. The control software is implemented in the Windows environment with Labview. The subdivision driving and the method of computing the number of steps considering error term are used to reduce the accumulation of errors in 关键词：ground testing;optical performance;space remote sensing;full wave band;automation- 34
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发布时间：2020-07-07
Driving and Controlling
- 摘要：
In order to promote the accuracy of facial recognition, an improved algorithm of the neural network based on NMF for recognizing faces was proposed. First, features from facial images are extracted by using the im proved method of non-negative matrix factorization to increase the decomposition speed of NMF. Then the extracted feature information is made as a neural network learning entrance for characteristics training. Due to the problems of minimum local value and slow convergence speed in the process of 关键词：machine vision;face recognition;nonnegative matrix factorization;genetic algorithm;neural network- 60
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发布时间：2020-07-07 - 摘要：
Hyperspectral remote sensing image contains rich space, radiation and spectral information. Meanwhile, massive data also lead to many problems in the transmission and storage of hyperspectral imaging technology. To solve this problem, a new method of hyperspectral remote sensing image reconstruction based on compressive sensing is proposed, which combines the spectral correlation and multi direction prediction. Firstly, according to the spectral correlation of hyperspectral remote sensing image, the bands o 关键词：hyperspectral remote sensing image;compressive sense;prediction model;image reconstruction- 36
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发布时间：2020-07-07 - 摘要：
One of the key factors which influence the accuracy of the optical devices in a range is the distortion of the camera lens, especially when the camera Field of View(FOV) is very wide under the condition of short focal length. To some extent, current calibration methods works well. However, the residual errors are still so large that cannot be neglected. In order to eliminate the effect of these errors and improve the angle measuring accuracy, we propose two algorithms called Local Least Square (LLS) and Fra 关键词：distortion;short focus wide-angle;angle measuring accuracy;local least square;fractal interpolation surface- 32
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发布时间：2020-07-07 - 摘要：
In order to study phase diversity (PD) technique quantitatively, numerical simulations and experiments has been performed. In numerical simulations, 0.1λ~0.5λ root-mean-square (RMS) random phase aberrations are used to investigate the PD technique from images degraded by these random phase aberrations. Root-mean-square errors (RMSE) of phase aberrations detected by PD is less than 10－5λ, and the reconstructed images become much better than the degraded focus-plane images.An experimental system based on Liqu 关键词：phase diversity technique;wave-front sensing;image reconstruction- 86
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发布时间：2020-07-07 - 摘要：
In order to satisfy the demand of the imaging system under the global exposure mode of high dynamic range and high sensitivity, we designed a camera based on the CIS-2521 scientific CMOS image sensor, implementing the correlated quadruple sampling algorithm in the FPGA by analyzing the feature of CIS-2521's pixel readout structure and combining its built-in circuit of correlative double sample, and it denoises the vertical noise obviously. The imaging system has higher output dynamic range of the image data 关键词：global exposure;scientific CMOS;correlated quadruple sampling;noise suppression;high dynamic range- 56
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发布时间：2020-07-07
Display and Image
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