最新刊期
期 7 ， 2018
- 摘要：
Combining light-patterning process with self-assembly trait, we applied photo-alignment technique to control the arrangement of liquid crystal blue phase (BP) cubic superstructure. By means of generating alternate aligned areas and non-aligned areas, the amplitude-modulation diffraction devices can be designed, which derives from the periodic reflection intensity of the patterned BP. By means of generating alternate orthogonal alignment directions, the phase-modulation diffraction devices can be designed, w 关键词：blue phase;photo-alignment;localization;superstructure;diffraction;stimuli-responsive- 311
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发布时间：2020-07-06 - 摘要：The speckle phenomenon and the Gaussian distribution affects image quality greatly in laser illumination. In order to change Gaussian distribution to flat-top distribution and reduce the speckle phenomenon to get uniform light spots, this paper discusses the feasibility of speckle reduction using random diffuser. We designed a laser illumination system using "random micro-lens array" as the random diffuser. It can achieve a flat-top light illumination with divergence angle 36° and aperture 2 mm. A comparison of the quality of the light spot is made using fused silica stick and G-lens as the light transmitting component. We measured the distribution of the light spot and the speckle. This method can be verified to reduce speckle contrast to 4.84%, which reflects the excellent ability to enhance the quality of laser illumination.关键词：speckle reduction;random micro-lens array;laser illumination;speckle measurement
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发布时间：2020-07-06 - 摘要：
Flexible OLED screens are prone to produce the phenomenon such as optical device damage, OCA peeling during the folding problem. The position of the stress neutral layer in the display layers should be carefully adjusted and the strain of the OCA layers should be reduced to solve this issue. In this paper, a simulation model for the foldable OLED screen is established. The influence of stack structures, cover window stiffness, OCA thickness, back plate thickness and bend radius on the position of stress neu 关键词：flexible OLED;bend;neutral layer;stress simulation- 462
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发布时间：2020-07-06 - 摘要：
In order to investigate the dielectric properties of liquid crystal (LC) materials, the dielectric anisotropy and dielectric loss of two fluorine-containing tricyclic NCS LC materials, 4PPTGS and 4PUTGS, were studied in this paper. Firstly, the capacitances of the LC cells were measured with a precision LCR meter (Agilent E4980A). The parallel and vertical dielectric constants of both LC materials were obtained by using the dual-cell model and the LC cell capacitance model. On the basis of the voltage-capac 关键词：LC materials;capacitance;dielectric anisotropy;dielectric loss- 359
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发布时间：2020-07-06 - 摘要：Black Gap is a common defect in the production of large size TFT-LCD(Thin Film Transistor-Liquid Crystal Display). It directly deteriorates the quality of products and reduces the competition of products. The study shows that panel is extruded deformation by long time external force in cassette and the post spacer in cell is damaged and can't restore in time to result in black gap. To solve this issue, we can control the time of the panel in the cassette, confine oven process or reduce temperature and time properly, increase the contact area and decrease the contact angle between the cassette and panel, increase the contact density between post spacer and panel, and increase sub post spacer top CD respectively. All those actions decrease the black gap ratio from 8.58% to 0.1%, the quality of products has been greatly improved.关键词：black Gap;cassette;contact area;post spacer
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发布时间：2020-07-06 -
Monte Carlo simulations of nematic liquid crystal director structures confined to cylindrical cavity
摘要：Based on modified Gruhn-Hess pair potential, the director structure of nematic liquid crystal PAA molecules which are confined in the cylindrical cavity with radial boundary conditions is studied by Monte Carlo simulation. After the balance of the cylindrical cavity system, we calculated the second order parameters, axial order parameters, radial order parameters, angular order parameters, and snapshots of the director. The results show that the liquid crystal molecules are uniformly aligned in a certain direction in the plane perpendicular to the axis of the cylindrical cavity under the free surface conditions and the director structure is a planar polar structure under the radial anchoring effect. Under the radial anchoring condition, with the increase of anchoring strength, the radial parameters of the liquid crystal molecules are increased. The changing temperature will change the ordering of the liquid crystal molecules, but it does not change its director structure.关键词：cylindrical cavity;nematic;Monte Carlo simulation;order parameter- 308
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发布时间：2020-07-06 - 摘要：
At present, a variety of sudden Mura phenomena always appear in the process of introducing new products. In this paper, in order to solve the problem of a new unknown corner white Mura which happened in TV product process, a lot of investigation and reasoning work are carried out, firstly. Preliminary, we estimate the Mura is derived from the Cell segment. We measure the liquid crystal purity, the liquid crystal component and the sealant dissolubility difference of the Mura region by using gas chromatograph 关键词：TFT-LCD;corner white Mura;liquid crystal;side sealant- 459
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- 85
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发布时间：2020-07-06
Material and Device
- 摘要：
The paper investigates the influence of the dominant eye in the three-dimension lenticular display. The experiment selects 25 college students with right eye dominance and 25 college students with left eye dominance as viewers. They are interested in new technologies and volunteered to experience watching the autostereoscopic display. They passed the appropriate exercise. In the experiment, the viewers move left and right to see the video played by the three-dimension lenticular display and record the subje 关键词：three-dimension lenticular display;dominant eye;transition area;viewing angle- 313
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发布时间：2020-07-06 - 摘要：
In order to solve the problem of the occlusion, rotation, fast motion, deformation in target tracking, the paper proposes the response adaptive tracking algorithm based on convolution neural network. First, we extract multi-layer convolutional features of target by using convolution neural network, and gain the multi-template response of the target exploiting particle filter algorithm to adaptively learn the objectives of the expected response. Then, the dual form of the objective function is constructed to 关键词：machine vision;object tracking;convolution neural network;response adaptation;correlation filter- 318
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- 3
发布时间：2020-07-06 - 摘要：
To overcome the deficiencies in color gamut of the common Liquid Crystal display system, a wide color gamut liquid crystal display system is designed with white and emerald light-emitting diodes as the backlight, which is based on the existing color gamut expansion technology. This paper analyzes the color gamut of the common display system, and uses the emerald light-emitting diode with a dominant wavelength of 501 nm as the extended backlight source to maximize the gamut coverage. It expands the blue-gree 关键词：wide color gamut;gamut expansion;color mixing theory;color gamut coverage;display- 326
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发布时间：2020-07-06 - 摘要：
Wavelet neural network(WNN) has a highly nonlinear mapping function and a strong adaptive ability, but the WNN algorithm tends to fall into local minimum and converges slowly. The artificial bee colony algorithm (ABC) has a strong global search ability and faster convergence rate. The two algorithms complement each other and have been applied to voice recognition. In this paper, ABC algorithm is improved. A new solution search equation is proposed in the bee mining and the observation bee. Adaptive Double S 关键词：artificial colony algorithm;wavelet neural network;noise;speech recognition- 359
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发布时间：2020-07-06
Image Processing
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