最新刊期
期 8 ， 2017
- 摘要：
In order to analyze the image blur of displays, a simple equation to correlate the motion picture response time (MPRT) with LC response time and TFT frame rate is established. Three effective approaches to reduce MPRT are:(1) fast LC response time; (2) high frame rate, and (3) appropriate backlight duty ratio. At 120 Hz frame rate, if the LC's response time is less than 2 ms, then its MPRT would be comparable to that of OLED. LC response time can be greatly improved by employing an ultra-low viscosity LC and developing fast-response LCD modes. To achieve CRT-like MPRT (less than 1.5 ms), we could increase the frame rate or decrease the duty ratio.
关键词：motion picture response time;fast response;liquid crystal displays- 19
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发布时间：2020-08-12 - 摘要：
To overcome the disadvantages that non local total variation based on L2 norm doesn't consider the nonlocal gradient and can't effectively recovery image's texture, a new non local total variation based on L1 norm is proposed. The paper first analyzes the characteristics of the new algorithm, and then employs the new algorithm for image recovery. Bregman iteration scheme is used to optimize the image recovery problems. Finally, the comparing experimental results show that the proposed non local total variation model based on L1 norm reconstructs more image details and gains more 1 dB higher peak signal to noise ratio than non local total variation model based on L2 norm.
关键词：image recovery;non local total variation;bregman iteration;non local gradient- 17
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发布时间：2020-08-12
- 摘要：In order to analyze the image blur of displays, a simple equation to correlate the motion picture response time (MPRT) with LC response time and TFT frame rate is established. Three effective approaches to reduce MPRT are:(1) fast LC response time; (2) high frame rate, and (3) appropriate backlight duty ratio. At 120 Hz frame rate, if the LC's response time is less than 2 ms, then its MPRT would be comparable to that of OLED. LC response time can be greatly improved by employing an ultra-low viscosity LC and developing fast-response LCD modes. To achieve CRT-like MPRT (less than 1.5 ms), we could increase the frame rate or decrease the duty ratio.关键词：motion picture response time;fast response;liquid crystal displays
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发布时间：2020-08-12 - 摘要：E7 is a commonly used polar liquid crystal mixture, which has a high optical anisotropy and a wide temperature range of nematic phase. In this work, the absorption characteristics on terahertz band of E7 are studied using the quantum chemistry method, which is called Gaussian98 program based on density functional theory. The terahertz absorption of the constitutional molecular groups were analyzed and compared with the experimental data. The results show that the number of benzene rings and the presence of oxygen atom in the molecular side chain will influence the terahertz absorption strongly in the intensity, the location and number of absorption peaks. Compared with the experimental references, the calculated absorption information of molecular vibration in the lower frequency band is more clear and complete. In the higher frequency band, the absorption of the calculated molecular vibration is agreement well with the experimental data.关键词：E7;liquid crystal;terahertz;density functional theory;absorption;molecular groups
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发布时间：2020-08-12 - 摘要：The alignment ability of polyimide was obtained by Photo-Alignment process, and then IPS type LCDs was prepared in the experiment. Pre-tilt angle, contrast ratio and transmittance of LCD samples prepared under different post-bake time and UV dosage were characterized by AOI (Automated Optical Inspection) and DMS LCD photoelectric measuring system. Besides, image sticking (IS) of all the conditions was studied. The results showed that the post-bake time and UV dosage ranged between 900~2 700 s and 400~600 mJ/cm2 had little effect on optical performance and these two factors had obvious influence on IS. IS had a tendency to deteriorate with the increasing of UV Dosage, and the trend tended to be gentle under the condition of high imidization. Excellent IS performance could be obtained by adjusting the post-bake time and UV dosage. The LCD samples showed the best IS performance under the conditions of post-bake 1 800 s and UV dosage 400~500 mJ/cm2.关键词：photo-alignment;post-bake time;UV dosage;optical performance;image sticking
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发布时间：2020-08-12 - 摘要：
The market and customers demand more and more LCD displays with wide range. FFS (Fringe Field Switch) technology appeared in 1996, with higher resolution than IPS(In-Plane Switching)technology. Through improving FFS technology in materials, designs and processes, BOE has formed ADS (Advanced Super Dimension Switch) technology, which has wide angle of views, high brightness and high aperture rate and so on. Although the ADS LCD module has many advantages, the module has a strong sensitivity at the same time. 关键词：liquid crystal;leakage;foam;compression ratio- 106
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发布时间：2020-08-12
Material Science
- 摘要：
In digital signal processing or control circuit based on FPGA, in order to export original sampling data or intermediate processing result data for analyzing and processing later, from the view of stabile transmission, easy realization and low cost, a 100 Mbps Embedded Ethernet data transmission system based on FPGA TSE IP core is designed. First, the paper introduces the hardware design thought in SOPC with the main processor NiosⅡ CPU, mainly including the Ethernet MAC designing based on TSE IP core. Unin 关键词：embedded Ethernet;data transmission;FPGA- 48
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发布时间：2020-08-12 - 摘要：This paper presents a LTPS-TFT voltage-programmed threshold voltage (Vth) compensation pixel circuit for AMOLED. Two effective factors on the compensation are studied and analyzed, one is Cst charging level in driving TFT Vth detecting and the other is keeping accuracy of detected Vth in display signal adding. In the process of Vth detecting, the correlated error is attributed to insufficient Cst charging through driving TFT's transfer current; and in the subsequent process of display signal adding, the accuracy loss of Vth keeping is attributed to the increment of capacity connected to the Vth keeping node. According to the analyses, the reason of compensation decaying in the high resolution pixel circuit is explained.关键词：active-matrix organic light-emitting diode;threshold voltage compensation;pixel circuit
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发布时间：2020-08-12 - 摘要：
In order to reduce the power consumption of the touch screen control circuit, a low power successive approximation analog-to-digital converter (SAR ADC) was proposed. The capacitor array digital-to-analog converter (DAC), comparator and successive approximation register were studied and designed. Firstly, based on two-stage parallel-series capacitor, the capacitor array DAC and reference voltage switching scheme is designed. Next, two-stage fully dynamic comparator is designed and the principle is analyzed. 关键词：touch screen;low power;successive approximation analog-to-digital converter- 71
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发布时间：2020-08-12
Driver and System
- 摘要：
In order to realize super-resolution of remote sensing picture, an digital domain tilting model time delayed and integration(DT-TDI) technology is proposed, and its relevant technologies such as digital domain TDI technology, tilting sampling imaging theory, DT-TDI technology and etc are analysed and investigated. First, we establish general digital TDI model; then establish DT-TDI model applied to different tilt angle by utilizing tilting sampling imaging theory, then we choose tilt angle of 45° and prove 关键词：digital domain TDI;tilting model;subpixel- 55
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发布时间：2020-08-12 - 摘要：To overcome the disadvantages that non local total variation based on L2 norm doesn't consider the nonlocal gradient and can't effectively recovery image's texture, a new non local total variation based on L1 norm is proposed. The paper first analyzes the characteristics of the new algorithm, and then employs the new algorithm for image recovery. Bregman iteration scheme is used to optimize the image recovery problems. Finally, the comparing experimental results show that the proposed non local total variation model based on L1 norm reconstructs more image details and gains more 1 dB higher peak signal to noise ratio than non local total variation model based on L2 norm.关键词：image recovery;non local total variation;bregman iteration;non local gradient
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发布时间：2020-08-12 - 摘要：
Aiming at the balance between watermarking transparency, robustness and watermarking capacity, a blind watermarking algorithm for color images is proposed based on the contrast sensitivity characteristics of human visual system (HVS) in this paper. In this algorithm, firstly, according to the contrast sensitivity characteristics of HVS and its calculation models, the contrast sensitivity thresholds from HVS perceiving the original image are calculated in the frequency field. And combined with the strength p 关键词：blind watermarking;color image;human visual characteristics;spatial frequency- 28
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发布时间：2020-08-12 - 摘要：For face recognition, the face image tend to get variations of expression, lighting, occlusion and pose. In the paper, we propose a face recognition algorithm based on low-rank eigenface and collaborative representation. In the algorithm, we firstly obtain the error images of the training images using the low-rank matrix recovery algorithm. Then, we calculate the feature vectors of the training images and the corresponding error images to constitute a feature dictionary respectively, and calculate collaborative representation of test image with feature dictionary. Finally, the test image was classified by the reconstruction error. Experimental results on AR and ORL databases show that the proposed face image recognition algorithm has a higher recognition rate and fast.关键词：face recognition;low-rank matrix;eigenface;collaborative representation
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发布时间：2020-08-12 - 摘要：
Aiming at the problem of attitude, orientation and inaccuracy of UAV in the process of UAV flight, a method of parameter correction for UAV based on Beidou/Inertial navigation and multi-sensor is proposed. The parameters of pressure sensor and speed sensor are introduced in the Beidou/inertial navigation system, and combined with Kalman filter algorithm to calculate the optimal positioning value. The specific parameters are given to the inertial navigation system by the speed sensor, and the UAV trajectory 关键词：Beidou/Inertial navigation;multi-sensor;parameter fusion;Kalman filter- 41
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发布时间：2020-08-12
Image Processing
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