最新刊期
期 3 ， 2018
- 摘要：
The dielectric anisotropy of liquid crystal materials is usually related to the frequency.For further investigations of the influence of frequency on the dielectric constant of liquid crystal materials, firstly, the thickness of the liquid crystal cells and the thickness of the polymide (PI) orientation layers were measured by UV spectrophotometer (METASH UV-9000S) and Surface Profiler (Contor GK-T) respectively.The precision hot-stage (LTS 350) was used to control the experimental temperature of 20℃, and t 关键词：LC cell capacitance model;dielectric anisotropy;frequency;capacitance- 403
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- 2
发布时间：2020-07-06 - 摘要：
Due to the privacy requirements of public places, viewing angle switchable liquid crystal display (LCD) technology has been an urgent market demand. The current viewing angle switchable technologies not only increase the thickness and cost of the display device, but also reduce the original wide viewing angle mode display. In this paper, a viewing angle controllable FFS mode with negative LC is proposed. By applying a high pre-tilt angle (40°~60°) on the side of the color filter, the third electrode is ipsi 关键词：Fringe Field Switching;contrast ratio;controllability of viewing angle- 393
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- 64
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- 4
发布时间：2020-07-06 - 摘要：
Structural stress and thermal stress of LCD glass substrate absorbed by quartz-rod was studied by numerical method. The change of glass structure stress and thermal stress of different material and different thickness glass was discussed. The results of structural stress analysis show that the maximum deflection, equivalent stress and bending stress are in the middle of glass. When the thickness of the substrate increases, the maximum stress value decreases significantly. The thermal stress analysis shows t 关键词：ANSYS;glass substrate;structural stress;thermal stress- 334
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- 35
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- 1
发布时间：2020-07-06 - 摘要：
Image sticking(I.S.) is a main factor that lowers the display quality in TFT-LCD, and it is also the most complicated issue that occurred on LC display. In this study, measuring method of I.S. level is proposed, and experiments are performed to find the relationship between image sticking and TFT transfer curve. The feature of AC image sticking is discovered, and the mechanism of the image sticking is obtained. By analyzing the luminance and TFT Ioff(Leakage current at TFT off state) on white(W) and black(B 关键词：image sticking;TFT;AC driving;leakage;holding voltage- 488
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- 162
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- 4
发布时间：2020-07-06 - 摘要：In order to reduce splice gap of display wall and make full use of environment light, high transmittance transparent liquid crystal splice display wall is designed and developed. To improve the display wall transmittance, some measures are taken. We optimize lines layout for a higher aperture ratio of pixel. RGBW pixel array which white pixels take 50% percent of total pixels, has been used in the plane design, then based on the improved color filter and high transmittance polaroid, 30% NTST and 19.4% transmittance LCD modules are produced. GOA design is used to achieve 5 mm narrow border. FPGA chip is adopted to drive the module. FPGA chippers form as a timing controller and an algorithm processor. Finally, a high transmittance liquid crystal display wall is spliced by 16×2 LCD modules.关键词：transparent TFT-LCD;RGBW;color filter;FPGA
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- 35
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- 0
发布时间：2020-07-06 - 摘要：
In the thin film transistor liquid crystal display (TFT-LCD) panel process, Gate(grid) layer and SD layer (source) circuit can use pure metal film layers according to the product requirements, such as molybdenum, copper and other metal film, can also use metal composite film layers such as aluminum molybdenum, aluminum neodymium molybdenum, molybdenum aluminum molybdenum metal composite film. When different metal or metal composite layers are used as Gate and SD circuits, different etchant should be applied 关键词：profile;etch rate;film;etch- 385
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- 76
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- 2
发布时间：2020-07-06
Material and Device
- 摘要：
In order to solve the problems of video scintillation, charge leakage and achieving dynamic multi-grayscale display on electrowetting electronic paper displays, a set of driving system was designed for the study of electrowetting electronic paper displays. First of all, this paper proposes a driving system architecture of embedded platform + FPGA based on the functions that the complete electrowetting electronic paper drive system must have, in which the embedded platform can carry out real-time image proce 关键词：electrowetting display;driving system;multi grayscale dynamics;video flashing;charge leakage- 362
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- 2
发布时间：2020-07-06 - 摘要：
In order to solve the problem that the traditional threshold segmentation algorithm is difficult to detect the spot-type defect from low contrast background, an improved Otsu algorithm is proposed.Based on this, a TFT-LCD spot-type defect automatic optical detection system is constructed.First, the effect of texture background is removed by Gabor filtering.Then, Using the different distribution characteristics of Weibull distribution function when the shape parameter of the Weibull function is segmented, th 关键词：spot-type defect detection;TFT-LCD;improved Otsu algorithm;automatic optical detection system- 317
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- 31
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- 3
发布时间：2020-07-06 - 摘要：In order to overcome the shortcomings of traditional 3D imaging algorithms for high-speed spinning targets, such as high computational complexity, poor imaging result and robustness, a fast 3D imaging algorithm based on GRT-CLEAN is developed. First, the 3D features of the target are extracted with the combination of generalized Radan transform(GRT) and CLEAN technology which could obtain a high resolution image. Then, the scattering targets are estimated with two separate grid sequentially (from coarse grid to fine grid), which could reduce the computational complexity and speed up the imaging process. The effectiveness of the current 3D imaging algorithm is verified by the simulation experiment and numerical analysis. Results show that the present 3D imaging algorithm based on GRT-CLEAN can obtain an effective image under the circumstances of low signal-to-noise ratio and no target occultation, and greatly reduce the computational complexity compared with the traditional GRE-CLEAN imaging method.关键词：high-speed spinning target;generalized Radan transform(GRT)-CLEAN;mesh generation;3D imaging
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- 14
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- 0
发布时间：2020-07-06 - 摘要：
In order to achieve unmanned aerial vehicle self-landing, considering the characteristics of UAVs (unmanned aerial vehicle) landing areas which are lack of features and irregular distribution in different shapes, an UAV landing area identification method is proposed based on point cloud processing technologies in this paper. Multi-view 3D reconstruction algorithm is used to generate point cloud from images captured by a camera fixed on an UAV. Taking the spatial distance as the smoothing term and the height 关键词：3D reconstruction;unmanned aerial vehicle;point cloud processing- 335
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- 2
发布时间：2020-07-06 - 摘要：
The design method of the pure-phase type computer-generated-hologram for intelligent display based on the principle of the kinoform has been introduced.On this basis, taking snowflake pattern and reticle pattern as examples, experimental samples of holography elements was developed, and holographic reconstruction is completed, real-time reconstruction images can be used for intelligent display.Method:The reconstruction images could be obtained by controlling the height and width of micro-structures on the s 关键词：intelligent display;pure-phase computer-generated-hologram;quantitative phase structure;kinoform;diffractive optical element- 338
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- 3
发布时间：2020-07-06 - 摘要：Face alignment is an important part of face recognition system.The accuracy and speed of alignment directly affect the effect of face recognition.Face images have different postures, different expressions, different lighting conditions and other factors.Face alignment becomes a difficult problem.This paper proposes a auto-encoder network face alignment algorithm based on SURF features.The approximate face feature points are found by the rough location network.The local SURF features are extracted and input into the local thinning network.The exact locations of the feature points of the face are further refined by the cascade structure.In the face data sets AFLW and HELEN, we compared some new alignment method.The average error rate is 8.80%, the computation time is 7.6 ms under i5 quad core CPU, 2.3 Hz dominant frequency.Our face alignment method has good robustness in real scene (including single and multiple faces), and it can achieve accurate positioning.关键词：SURF feature;face alignment;auto-encoder network
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发布时间：2020-07-06
Image Processing
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