最新刊期
期 9 ， 2017
- 摘要：
In recent years, white light-emitting diodes are emerging as an indispensable solid state lighting source for the next generation lighting industry and display systems because of its high efficiency, energy saving, environmental protection and long service life. In order to prepare high performance white light LED, phosphors with good luminescent properties are essential. And nitride and oxynitride luminescent material become important candidate materials for white LED because of their excellent properties, 关键词：white LED;phosphor;nitride and oxynitride luminescent material- 51
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发布时间：2020-07-07 - 摘要：
Next main development trend about LCD panels with light weight and high reliability performance at lower cell gap is strongly requested from market. Therefore the development trend of liquid crystal single material does have the physical property of higher clearing point(CP), birefringence (△n) and dielectric anisotropy(△ε). Recent years, quaterphenyl single material could be improved about the LC mixture performance at high operation temperature and high birefringence and higher reliability. A series of te 关键词：birefringence;reliability;liquid crystal;quaterphenyl- 56
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发布时间：2020-07-07 - 摘要：
Excellent viewing angle and outstanding ability of color reproduction in-plane switching liquid crystal displays (IPS-LCDs) are widely applied in TFT-LCD. However, its development in high-end LCD is limited by its slow response. In this paper, the electro-optic characteristics and response time of FFS and FIS modes in the IPS type are simulated with different rubbing angle by using the positive liquid crystal material. Furthermore, we report a simple method to reduce the response time in the fringe and in-p 关键词：fringe and in-plane-switching liquid crystal display;operating voltage;fast response- 127
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发布时间：2020-07-07 - 摘要：
In order to investigate the relationship between the structures and properties of LCs, twelve isothiocyanate liquid crystals composed of four-ring core and ethynyl bridge were synthesized via six steps based on arylboronic acid and 1-bromo-2-fluoro-4-iodobenzene. Their structures were confirmed by infrared spectrometry (IR) and 1H-nuclear magnetic resonance (1H NMR). The mesomorphic properties, birefringence and dielectric anisotropy of these compounds were investigated. The result reveals that all these co 关键词：liquid crystals;ethynyl;isothiocyanate;nematic phase;birefringence- 35
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- 24
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- 1
发布时间：2020-07-07
Material Scienc
- 摘要：
2[4'[difluoro(3, 4, 5trifluoro2methylphenoxy)methyl]-3', 5'difluoro[1, 1'biphenyl]-4yl]-5alkyltetrahydropyran derivatives was synthesized via butyl lithium, dehydroxylation, Suzuki and Williamson reaction (five steps'reaction) by employing 1, 4-Dibromo-benzene, 5-alkyl-tetrahydro-pyran-2-one and 3, 4, 5-Trifluoro-2-methyl-phenol as starting materials. The effects of reaction temperature, solvent, catalyst and material ratio on the yield were investigated. The optimum reaction conditions for the Dehydroxylat 关键词：tetrahydropyran;3, 4, 5-Trifluoro-2-methyl-phenol;electro-optical property;liquid crystal compound- 74
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发布时间：2020-07-07 - 摘要：In order to meet the requirement of the market for LCD panel's high contrast and high image quality, photo-alignment as a new type of non-contact alignment method is being widely studied. An IPS test cell was prepared by using an alignment material of photo-decomposition type polyimide, then film forming conditions and photoelectric effect of the cell were researched. Pre-tilt angle and photoelectric properties at different temperature and time of pre-bake and post-bake were characterized by FT-IR, AFM, Polarizing plate angle tester, etc. Results showed that temperature and time of pre-bake and post-bake had some relationship with pre-tilt angle, transmittance, contrast ratio and VHR. In this paper, the research could serve as a reference to the optimization of photo-alignment process parameters.关键词：IPS-LCD;polyimide;photo-alignment;horizontal alignment layer;process parameters
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- 97
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- 1
发布时间：2020-07-07
Material Science
- 摘要：A system for computer video interface automatic detection was proposed based on FPGA NIOS Ⅱ soft core, from the application point of view, when computers out of the factory. Computer plays a special video, and transmits the image to the detection equipment by video interface. Detection equipment converts HDMI, DP video signal into VGA RGB signal format through the video conversion chip controlled by NIOS Ⅱ soft core. Detection equipment detects line signal, field Signal, and then puts the values of pixel RGB in the SRAM. Computer reads data from detection equipment through the high-speed transmission interface. It is proved by experiments that the video interface detection method can save labor cost and has a high detection efficiency. The detection error rate is less than 1% and equipment can detect interface which outputs 4K video 30 frames per second.关键词：NIOS Ⅱ;video interface;efficient;4K
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发布时间：2020-07-07 - 摘要：In view of the poor portability and high cost of the current information screen system, the LED information online modification system is designed. This system includes a portable control terminal with the function of information editing, processing and transmission, and display terminals designed with the function of the information receiving and displaying. The core of the portable control terminal and display terminals is microprocessor. The control terminal uses matrix keyboard to realize information editing and communicates with the display terminals with the help of wireless modules equipped by them. The practical test show that this system can realize the function that one control terminal modifies multiple LED display terminals' text information online in real time.关键词：LED screen;on-line modification;portable control terminal;wireless transmission
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发布时间：2020-07-07
Driver and System
- 摘要：
In order to overcome the artificial colony optimization k-means which be fallen into local optimum easily, converged slowly, segmented roughly and other issues, a new image segmentation algorithm is proposed based on adaptive artificial bee colony and K-mean clustering. First, the population is initialized by the maximum and minimum product; Secondly, adaptive search parameters are used to adjust neighborhood search scope dynamically, that makes artificial bee colony algorithm quickly converge to global opt 关键词：artificial bee colony;k-means clustering;image segmentation;powell local search;maximum minimum product distance- 42
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发布时间：2020-07-07 - 摘要：In order to resolve the problem of laser communication under marine conditions, the extraction method of light spot image was studied. Based on the research, an experiment was carried out on the test platform, and then, light spot images were processed. The feasibility of this method was proved by the comparison of different images, which provided a solution to solve the issue on light spot extraction of laser communication on sea surface. Experimental results showed that the maximum error on X axis is 2.60 pixel and 1.54 pixel on Y axis. The effect of light spot image processing of laser communication was anticipated through adopting the method proposed under marine conditions.关键词：laser communication;sub-pixel extraction;marine environment;algorithm for image analysis
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发布时间：2020-07-07 - 摘要：
In order to measure the transient coordinates that high-speed projectile goes through the screen accurately, a real-time image processing card based on FPGA and DSP is designed. We designed an automatic measurement system of high-speed projectile location coordinates by using processing card and embedded software algorithm. We can set camera work at planar array mode or linear array mode, we also let measuring front-end do automatic mutual alignment, do automatic composition of laser screen target. We impro 关键词：high-speed projectile;position measurement;automatic;FPGA;DSP- 23
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发布时间：2020-07-07 - 摘要：In order to solve the accuracy of the action recognition system in complex scenes, an improved method based on local part model, feature pre-processing and feature generalization is proposed. The algorithm is based on the bag of the visual words. Local part model and random sampling are used to extract features. The redundance of the features and the relationship between the features are reduced by the pre-processed procedure. The features processed are closer to the original features, meanwhile the features are generalized to prevent the over fitting. To demonstrate the performance of the proposed method, experiments are carried on HMDB51 datasets. The results show that the algorithm has higher efficiency than the original in complex environment. Compared with other methods, the proposed algorithm shows more accurate. It has a better recognition effect on video sets with large volume, complex background and real scene.关键词：action recognition;bag of the visual words;local part model;feature pre-processing;feature generalization
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发布时间：2020-07-07 - 摘要：
In order to improve the effect of multi-feature fusion image retrieval, this paper proposed a kind of image retrieval algorithm based on block color histogram and GWLBP. By means of K-means mean value clustering, the algorithm implemented color clustering on RGB color space; then, it divided 4×4 uniformed block image into 9 sub-blocks to extract color volume histogram of each sub-block and endow different weights so as to calculate color features. Based on Gabor filter bank, the smoothing in various resolut 关键词：image retrieval;color clustering;block color histogram;local gabor wavelets binary patterns;gabor wavelet filter- 36
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发布时间：2020-07-07
Image Processing
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