最新刊期
期 10 ， 2019
- 摘要：
This study demonstrated the optically tunable random lasing from azo-dye-doped polymer dispersed liquid crystal (PDLC) in capillary tubes, in order to expand new applications for this device. The azo-dye-doped PDLC was prepared in glass capillaries with different core diameters, and the random lasing thresholds of these samples were measured respectively. The spectra of random lasers were measured with increasing the intensity of ultraviolet radiation. The experimental results show that the random laser thr 关键词：laser and laser optics;dye lasers;liquid crystals;multiple scattering- 442
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发布时间：2020-08-12 - 摘要：This study demonstrated the optically tunable random lasing from azo-dye-doped polymer dispersed liquid crystal (PDLC) in capillary tubes, in order to expand new applications for this device. The azo-dye-doped PDLC was prepared in glass capillaries with different core diameters, and the random lasing thresholds of these samples were measured respectively. The spectra of random lasers were measured with increasing the intensity of ultraviolet radiation. The experimental results show that the random laser threshold measurements of different core diameter capillary samples (100 μm, 300 μm, 500 μm) are 11.8 μJ/pulse, 8.6 μJ/pulse and 13.2 μJ/pulse. The experimental results also show that as the intensity of ultraviolet radiation increases (from 0 mW/cm2 to 150 mW/cm2), the random laser intensity decreases gradually, and the FWHM of the spectrum becomes wider. And the random lasing showed similar properties under the UV beam with different polarized directions during the optical tuning process. Our work verifies the possibility to fabricate miniature laser devices in cylindrical confinement structures, and extends the application scope of PDLC.关键词：laser and laser optics;dye lasers;liquid crystals;multiple scattering
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发布时间：2020-08-12 - 摘要：
In terms of liquid crystal on silicon (LCoS) device, the optical properties of off-state pixels would be affected by the adjacent on-state pixel, because the distance between the adjacent pixels is small. To improve this issue, a three-dimensional (3D) optical modeling based on the normally white LCoS mode is built to investigate the effects of three parameters on the adjacent pixels' optical properties. As a result, (1) the position and area of dark zone on the edge of adjacent pixels change with the initi 关键词：LCoS;adjacent pixel;reflectivity;gap of liquid crystal cell;pixels gap- 419
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发布时间：2020-08-12 - 摘要：
Some new designs with low power consumption of hybrid viewing-angle LCD are proposed in order to increase the rotating efficiency of liquid crystal molecules by tuning electric field and to reduce the loss of electric field from passivation layer. Firstly, a new type of liquid crystal with low voltage is used. Then the sequence of process on the color filter is changed, and the insulated passivation layer on the TFT side of glass substrate is patterned and thinned. There are two schemes for thinning. One is 关键词：low power consumption;A-Si;LCD;hybrid viewing angle;architecture design- 369
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发布时间：2020-08-12 - 摘要：
In order to achieve slim outline, high luminance, wide viewing angle and high contrast radio liquid crystal display (LCD), a backlight model with integrated light guide plate (LGP) that contains light guide and light control micro-structures is designed. Through these design methods, the functions of all optical films are integrated into the LGP and one-dimensional local dimming modulation is able to be realized in edge-lit backlight module (BLM). First of all, a micro-prisms array coated reflective layer w 关键词：light control;optical design;integrated light guide plate;backlight module- 395
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发布时间：2020-08-12 - 摘要：
OGS(One Glass solution) touch display module has Black Matrix(BM) on the edge in the off-state, and visual area color difference is obvious, the appearance is not beautiful. Based on this problem, we studied the film structure of capacitive touch display module, and analyzed the main factors which affect the color bias of the product. First, OGS color difference between different stacks and film thickness was simulated by optical simulation software. Then, based on the simulation results, the main stacks wh 关键词：touch display module;color bias;OGS;BM;IM- 378
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发布时间：2020-08-12 - 摘要：
The LCD is mainly composed of two substrates and the liquid crystal in the middle. Among them, photo spacer is an important part which is placed on th bottom substrate and sustains the upper substrate. As the trend of higher and higher resolution of the display, there is a need for accurate controlling of morphology of the photo spacer in mass process. In this paper, we pay attention to one of the most common issue of very small size photo spacer that the top of it suffers concave surface which influences t 关键词：computer vision;edge detection;geometric figure;curve fitting;subpixel- 384
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发布时间：2020-08-12 - 摘要：
Black light leakage is a common in advanced-super dimensional switching(ADS) mode TFT-LCD product. It is easy to cause light leakage when the panel has deformation or internal stress, especially for narrow-length products. This article discussed the reason of light leakage and improve it. It is found that the panel deformation, internal stress, and liquid crystal deflection are abnormal, which can lead to light leakage. For example, this paper discusses 312.4 mm(12.3 in) ADS automotive product. At first, fo 关键词：automotive LCD display;light leakage;flatness;backlight;backlight tape- 477
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发布时间：2020-08-12
Materials and Devices
- 摘要：
In order to solve the drawbacks of traditional restoration algorithms relying on a priori knowledge in the process of degraded image restoration, the advantages of BP neural network learning and generalization ability is proposed to carry out degraded image restoration research. Firstly, the BP neural network is used to recover the degraded image. Then, for the BP neural network, due to the excessive dependence on the initial value of the network, the network convergence speed is slow and it is easy to fall 关键词：BP neural network;grey wolf optimizer;L-R restoration algorithm;Wiener filtering;PSO-BP neural network- 358
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发布时间：2020-08-12 - 摘要：
Aiming at the problem that the dynamic range of high dynamic range (HDR) image does not match the ordinary display device, a tone mapping algorithm combining luminance partitioning and guidance filtering is proposed. Firstly, the input HDR image is converted into the CIEL*a*b* space by color space conversion to obtain the luminance layer and the chrominance layer image. Then the luminance layer image is logarithmically compressed and luminance partitioned, and the compressed partition is performed. The lumi 关键词：high dynamic range image;tone mapping;luminance partition;guided filtering;standard dynamic range image- 345
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发布时间：2020-08-12 - 摘要：
In order to apply the super-resolution reconstruction algorithm to the field of medical imaging and improve the resolution of various medical images, a multi-scale residual network model applied to CT images is proposed for the problem of the singleness of the network structure and the resolution multiplier of the current mainstream algorithm. Firstly, the model framework is built by cascading multi-level residual blocks, and the convolution kernels of three scales are used in the residual block to extract 关键词：medical image;super-resolution reconstruction;multi-scale feature;residual network;deep learning- 511
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发布时间：2020-08-12 - 摘要：
In order to solve the problem that the recognition rates of skilled forgery signatures is not satisfied, a personal signatures recognition scheme based on 3D depth feature of strokes is proposed. Firstly, the real signatures of different writers and the skilled forgery signatures are collected by high-precision stereo microscope, obtaining the surface 3D point cloud data of the signature strokes. Secondly, after filtering the noise of cloud data through the Gaussian filter, the statistical features such as 关键词：signature recognition;depth feature;3D image process;feature extraction;data augmentation- 348
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发布时间：2020-08-12 - 摘要：
Electronic speckle pattern shearing interferometry (ESPSI) is a new method for measuring displacement derivatives based on electronic speckle pattern interferometry. It is especially suitable for real-time measurement of nondestructive testing. The acquired phase difference map in the ESPSI is usually seriously affected by noise. Thus filtering processing is needed to get a good phase difference map. Filtering by CPU takes too long time for real-time processing. To take full advantage of GPU's strong parall 关键词：electronic speckle pattern shearing interferometry;image processing;filtering;GPU accelerated calculation- 329
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发布时间：2020-08-12
Image Processing
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