最新刊期
期 4 ， 2019
- 摘要：
Subjected to different electric fields, liquid crystal molecules would rearrange and the polarization directors would change, which could affect the capacitance characteristics of liquid crystal cells. Based on the free energy of liquid crystals due to the flexoelectric effect, the expressions of the elastic, dielectric and flexoelectric free energy density are obtained. Applying the elastic theory and the phase filed methods of liquid crystals, the phase field equations describing the distribution and swit 关键词：liquid crystal cell;phase filed method;flexoelectric effect;surface charge density;capacitance- 328
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发布时间：2020-07-05 - 摘要：
After long-term use of AMOLED display, the problem of OLED device degradation will inevitably occur. Sometimes, the rate of degradation may be different in different areas of panel. Thus, the OLED device degradation can cause some issues, such as general decrease of luminance and static image sticking. As usual, the longer pixel is used or the higher luminance for display, the more serious OLED device degradation occurred. In this paper, a new technology to improve OLED device degradation by external electr 关键词：voltage sensing;electronic-compensation;device degradation;image sticking- 384
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发布时间：2020-07-05 - 摘要：An IPS-RM LCD was fabricated by adding RM(Reactive Mesogen) into negative LC and exposuring two times under UV processing. The pretilt angle, contrast ratio and transmittance were measured using AOI (Automated Optical Inspection) and DMS(Display Measuring System), and the reliability of the sample with RM was researched. The results indicate that the pretilt angle became smaller after adding RM, and the luminance of the dark state decreased, thus the contrast enhanced. The RM polymerizes completely after two times UV irradiation to generate small granule polymer on the surface of alignment layer, which makes the LC aligned more homogeneous, and achieve stronger anchoring energy. The voltage holding ratio (VHR) increases and the residual direct current (RDC) decreases.关键词：negative LC;reactive mesogen;electro-optic characteristics
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发布时间：2020-07-05 - 摘要：Large data load causes undesirable effects containing long signal delay time, high source IC temperature, high power consumption, etc. These effects become more critical with the increasing panel size and resolution. A kind of inverted U-type TFT distinguished from conventional U-type TFT was proposed in this paper. The layout shape of TFT source and drain was exchanged to decrease the overlay area between data line and gate line. The data load became smaller as to the smaller overlay area. Inverted U-type TFT design was applied to a 598 mm(23.6 in) HD ADS half panel. It achieved similar optical parameters with conventional U-type TFT panel. Data capacity decreased by 24%, power consumption decreased by 10%, and source IC temperature decreased by 7.1% compared with conventional U-type TFT panel.关键词：inverted U-type;low power consumption;low source IC temperature
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发布时间：2020-07-05 - 摘要：
In the TFT-LCD industry, it is easy to cause Panel edge to be damaged during the cutting and transportation. When the damage position is just at the position of the silver point of the Panel, the silver glue enters through the breakage and contacts with the BM (Black matrix), causing the BM to be charged to form an interference electric field, thereby causing the liquid crystal to deflect abnormally and causing greenish problem. In Cut process, the increase of dummy Seal can make the dummy bar after cutting 关键词：cut;electro-static;silver glue;greenish;black matrix;dummy seal- 451
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发布时间：2020-07-05 - 摘要：
Color shift is an important indicator for LCD panel's image quality. In order to accurately evaluate the key factors in panel color shift, situations of sub pixel and polarizer optical eigenmodes have been investigated. Firstly, after comparing the simulation and actual measurement of color shift on RGB & RGBW panels, the result shows that different types of color filters and the methodology used directly decide the color shift. Thus a new evaluation method of color shift is proposed to overcome the def 关键词：ADS LCD panel;color shift simulation;polarizer optical eigenmode- 368
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发布时间：2020-07-05 - 摘要：
The problem of vertical crosstalk caused by capacitive coupling and TFT leakage becomes particularly prominent in high-resolution TFT-LCD products, which greatly affects the yield of products. The industry usually uses VESA 2.0 standard to test crosstalk level by window patterns, but there is still no quantitative analysis method to predict crosstalk level. Based on the formation mechanism of vertical crosstalk. A quantitative analysis method for predicting the vertical crosstalk level was proposed in this 关键词：TFT-LCD;vertical crosstalk;capacitive coupling;TFT leakage;V-T curve- 484
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- 68
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- 2
发布时间：2020-07-05 - 摘要：
The paper proposes a high-precision 10-bit DAC structure for high resolution AMOLED source drive for higher resolution and higher precision of OLED display panel.The DAC consists of a 6-bit GAMMA correction resistor-string DAC and a 4-bit output buffer based on interpolation of the tail current, achieve high precision while occupying a small chip area.In order to further improve the gray-voltage precision of AMOLED drive, a DAC slope programmable unit is added to further adjust the linear DAC output curve t 关键词：source drive;high-precision DAC;slope programmable;interpolation- 364
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- 2
发布时间：2020-07-05 - 摘要：
The effect of annealing on the properties of p-ITO thin films was studied in order to improve many imperfections of p-ITO thin films in mass production, such as bad spots on the film after annealing and corrosion of the film by etching solvent. In this work, p-ITO of 40 nm thin films were deposited at room temperature by utilizing magnetron sputtering with DC power supply, and annealed in N2 atmosphere under various annealing time and temperature. The crystallinity and microstructures of thin films were ana 关键词：bad spots;magnetron sputtering;square resistance;light transmittance;thin film transistor- 416
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发布时间：2020-07-05 - 摘要：
The continuous warming of the virtual reality (VR) display pushes the microdisplay to the high resolution and high refresh rate. However, the limited bandwidth of the microdisplay is difficult to carry the massive image data in the virtual world. In order to reduce the time redundancy in the scan imaging process of the microdisplay system, improve the data transmission efficiency and image linearity, an atomic scan model of pseudo-random scan order is established. The atomic scan uses a molecular space-by-b 关键词：microdisplay;atomic scan controller;transmission efficiency;linearity;subspace- 376
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发布时间：2020-07-05 - 摘要：LED backlight module has become the main choice of LCD backlight mode because of its many advantages. But in practical application, if a LED string faults, the LCD will appear dark line, resulting in the brightness uniformity can't meet the requirements. The LED string must have the ability of fault self-detection in order to ensure the brightness uniformity of the LCD and the later maintenance efficiency. A self-detection circuit of the LED string in the LED backlight module based on DSP was designed. Taking the direct-down LED backlight module of 546 mm(21.5 in) LCD as an example, the specific hardware circuits of the LED board and driving board were designed. The software control logic was written by C language using the CCS 3.1 development tool. The self-detection results show that this circuit can detect the fault of the LED string effectively and meet the design requirements.关键词：LED backlight module;self-detection;brightness uniformity;constant current source
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发布时间：2020-07-05
Materials and Devices
- 摘要：
Aiming at the contradictory problem between image quality and embedding capacity in reversible data hiding, a reversible data hiding method combining central folding technology with minimum effective bit replacement is proposed. Firstly, the pixel in the original image is divided into two bit planes. Then the secret data is folded by using the central folding technology, and the folded secret data is embedded into the highest effective bit of the original pixel to generate two hidden pixels. Finally, the se 关键词：reversible information hiding;least significant bit replacement;center folding;high capacity- 397
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发布时间：2020-07-05 - 摘要：
To solve the problem that the traditional classification method has a relatively single extraction feature or the structure of the classifier is too simple, leading to a low recognition rate of the sign language, in this paper, the deep convolutional neural network architecture was combined as a classifier and a multi-feature fusion algorithm, and it was effectively identified by using texture features and shape features. Firstly, the texture features were obtained by LBP, convolutional neural network and g 关键词：gesture recognition;gesture extraction;multi-feature fusion;deep convolutional neural network;robustness- 384
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发布时间：2020-07-05 - 摘要：
Aiming at the infrared and visible images with large spectral differences, this paper proposed a multi-scale fusion model based on latent low rank representation (LatLRR) and pulse coupled neural network (PCNN). Firstly, the proposed algorithm used non-subsampled shearlet transform (NSST) to acquire the low and high-frequency components of the image. In view of the low-frequency component of the image to determine the final fusion effect, the LatLRR algorithm was used to mine the intrinsic salient features 关键词：latent low rank representation;image fusion;dual-channel PCNN;non-subsampled shearlet transform- 357
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发布时间：2020-07-05 - 摘要：
Aiming at the problem that the single saliency feature can not fully express the image saliency, resulting in low accuracy of saliency detection, a saliency detection algorithm for multi-feature fusion was proposed. Based on the high-level prior knowledge, the background priori and the center priori were redefined.The super-pixels near the center were set to high saliency values, and the center priori was solved by using Gauss distribution. Four kinds of salient features such as image sparseness, global con 关键词：significant detection;high-level prior;bottom feature;multi-feature fusion;sparse boundaries;superpixel differences- 361
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发布时间：2020-07-05 - 摘要：
At present, the Level-Set image segmentation method has the problem that the initial contour is greatly affected by human factors. The target segmentation and the target and background gray values are close to each other, and the ideal segmentation effect cannot be achieved. Aiming at this problem, this paper proposes a priori level set image segmentation method based on the Faster-RCNN network model to determine the initial contour and region information of the target, and builds the Caffe deep learning fr 关键词：Faster-RCNN;Level-Set;deep learning;building extraction- 431
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发布时间：2020-07-05
Image Processing
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