最新刊期
期 6 ， 2016
- 摘要：The chromaticity, resolution and adhesion strength of the white matrix materials for touch panel were analyzed at different conditions of temperatures, thickness and chemical solutions. Thus the white matrix materials were verified for one glass solution (OGS) process for touch panel. First, we focused our studies on the optical density (OD) value, resolution, chemical resistance and thermos-stability of the material with different thicknesses. The changes of chromaticity values at different thicknesses were studied. Then, we applied the white matrix material to the OGS touch panel process. In order to ensure the OD value being greater than 4.0 and make metal line on touch panel invisible, we proposed a dual layer structure including white matrix layer and black matrix (BM) layer. The white matrix layer thickness was 15μm and the BM layer thickness was 1.2μm. In the practical photo process, we adjusted the process parameters, such as increasing the photo-resistance thickness, exposure intensity and developing time, and successfully solved the metal open and metal remain problems. In the end, the touch panel with white matrix and BM by OGS technology was demonstrated.关键词：white matrix;chrominance;chemical resistance;optical density
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发布时间：2020-08-12 - 摘要：Atomic layer deposition (ALD) is considered as one of the most promising thin-film encapsulation technologies for flexible organic light-emitting diode (OLED) device because of high-quality films formed. In this work, different laminated structures of Al2O3/TiO2 composite film were prepared at low temperature (80℃) by ALD method. The growth mechanism of Al2O3 and TiO2 film was studied. The water vapor barrier properties of the different stacked structures of composite Al2O3/TiO2 thin film were studied by the calcium film, which were analyzed by water vapor transmission rate (WVTR) test and contact angle measurements. The WVTR of the 5 nm/5 nm×8 dyads Al2O3/TiO2 composite thin film was 2.1×10-5 g/m2/day and the OLED devices encapsulated by this optimized Al2O3/TiO2 structure exhibited better lifetime characteristics in high temperature and high humidity test.关键词：organic electroluminescent devices;thin film encapsulation;atomic layer deposition;water vapor transmission rate
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发布时间：2020-08-12 - 摘要：The fully leaky waveguide measurement system has been set up to measure the reflective mixed-mode twisted nematic liquid crystal cell.He-Ne laser was processed to become s polarized light or p polarized light.The polarized lightenters the liquid crystal cell by prism-coupled method and then the reflective signals with the combination of different polarized light that depend on the incident angle were collected under different voltages. The reflective light in different state can be predicted by means of simulation which was based on multilayer optical 4×4 matrix and elastic continuum theory. Tilt angle, twist angle and distribution of the director in liquid crystal cell under different voltage can be obtained by fitting the experiment data.关键词：optical waveguide technique;mixed-mode twisted nematic liquid crystal cell;director distribution;polarized light
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发布时间：2020-08-12 - 摘要：The far-field diffraction characteristics was studied in the different weak magnetic fields(0, 0.4649, 0.5062 and 0.5185 T)with the low power He-Ne laser of 1.5 mW(632.8 nm)being normal incident on the film of nematic liquid crystals TEB30A.The experiment results showed that the film of nematic liquid crystals TEB30A can produce diffraction in the four weak magnetic fields of 0, 0.4649, 0.5062 and 0.5185.The diffraction pattern could obviously be changed with the increasing of the magnetic strength. The number of diffraction rings increased, the width of diffraction rings became wide, and the diffraction field expanded outward. At the magnetic strength of 0.5062 T, the interference stripes appeared on the diffracting rings. While the magnetic strength increased to 0.5185 T, the interference stripes was becoming parallel. Under the effect of the weak magnetic field, the divergence of the laser beam was changed drastically in the far-field. Based on the Kirchhoff-Fraunhofer diffraction integral, the theoretical simulation results showed that, when the laser beam passed through the film of nematic liquid crystals TEB30A in the weak magnetic field, the transverse nonlinear phase would increase. With the weak magnetic strength increasing from 0 T to 0.5185 T, the nonlinear phase increased from 4 π to20 π.The weak magnetic field caused the nonlinear phase, resulting in the change of the far-field diffraction pattern. The change of the far-field diffraction pattern is also the change of the distribution of the transmitted light energy. Therefore, the technology of the weak magnetic field modulating the nematic liquid crystals can be applied to the areas of magnetic-optical switch and magnetic-optical limiters.关键词：low power;normal incident;the film of nematic liquid crystals TEB30A;weak magnetic field;diffraction
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发布时间：2020-08-12 - 摘要：The principle of polymer dispersed liquid crystal film as transparent projection screen on the application of electric field (ON state) is described and analyzed qualitatively and quantitatively. The transmittance curves with incident angle of samples are tested at PDLC-ON state. It shows that the transmittance of S polarized light is not affected by the PDLC film, while the transmittance of P polarized light decreases obviously. The physical model of the change of P polarized light transmittance with the incident angle is established, and the expression of the transmittance of P polarized light is given. The theoretical curve fits well with the experimental curve, which explains the imaging principle of the PDLC ON state as the transparent projection screen.关键词：polymer dispersed liquid crystal;transparent projection screen;imaging principle;Fresnel formula;transmittance
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发布时间：2020-08-12 - 摘要：Indium gallium zinc oxide thin film transistors (IGZO-TFT) were fabricated with the standard process of TFT-LCD arrays substrate.The effects of different oxygen partial pressure on IGZO-TFT performance were investigated by adjusting the oxygen partial pressure in IGZO film process. All devices showed good electrical properties.The threshold voltage of TFT was increased from 0.5 V to 2.2 V as the oxygen partial pressure was increased from 10% to 50%, whereas the sub-threshold swing had not changed. Applying a positive gate bias of 30 V for 3600 s, with the increase of the oxygen partial pressure, the positive shift of threshold voltage of IGZO-TFT was increased from 1 V to 9 V. The carrier concentration in TFT with higher oxygen partial pressure is lower. So it requires higher gate voltage for building the channel with the same conductive capability, and therefore the threshold voltage will be higher. In the Metal-Insulator-Semiconductor (MIS) structure, the lower carrier concentration leads electron accumulation layer to be thicker. There will be more energy states in band bending part of active layer which are the same as electron traps of gate insulator (GI). Consequently, it is possible that more electrons are captured by GI, and shift of threshold voltage will be greater.关键词：indium gallium zinc oxide thin film transistor;oxygen partial pressure;shift of threshold voltage;electron accumulation layer
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发布时间：2020-08-12
Material and Device
- 摘要：OLED microdisplay will suffer the pixel degradation and the luminance degradation after working in the high light and high contrast ratio state for a long time, which induces the ghost phenomenon. Therefore, this article proposes an improved current PWM pixel driving circuit which make compensations for the OLED pixel degradation. At the same time, the proposed circuit can also read the anode voltage of the OLED pixel, so the degree of the OLED degradation can be calculated and the luminance degradation can be compensated. This paper analyses the circuit structure and the compensation principle on the OLED degradation and luminance degradation. The key parameters which affect the OLED degradation compensation are obtained by the simulations. The experiment results show that the ratio of the OLED degradation of the proposed current PWM driving circuit is only 50% of the traditional 2T1C driving circuit when the difference of pixel degradation is less than 40 MΩ.关键词：recession compensation;current PWM driving circuit;sticking;OLED anode voltage
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发布时间：2020-08-12 - 摘要：A data channel reuse solution was proposed for resolving correction parameters updating manually problem. Starting with general LED display system, the channel reuse idea was proposed and a mathematical model of the control strategy was established, which was utilized to guide strategy design and implementation. An online updating correction parameters was realized by reusing data channel in display system. Through theoretical analysis and experimental verification, the system can overcome the problems of the process of correcting parameters, such as the time consuming, damage of hardware.关键词：LED full-color display;correction parameters;control strategy;data channel reuse
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发布时间：2020-08-12
Driving and Controlling
- 摘要：In order to satisfy the demand for integrated video and graphics processing technique in a cockpit display system, a method about airborne video graphics fusion display and video recording system based on SoC is proposed in this paper. Hardware platform is designed based on SoC. The graphics generation algorithms and video acquisition are performed by ARM processor and video graphics assist processor integrated in SoC. A double buffer and multi thread concurrent mechanism is designed to realize video graphics fusion display and real-time recording of video in cooperation with high speed storage and display interface integrated in SoC. Multiple formats resolution video source acquisition and large resolution graphics generation are supported by the proposed method. Experiments show that when capturing with 1024×768 resolution video and generating with 1920×1080 resolution graphics, the fame rate is 45 fps, which satisfies the requirements of the cockpit display system.关键词：cockpit display system;video recording;video graphics fusion;i.MX6Q
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发布时间：2020-08-12 - 摘要：In order to make the compressed images satisfy more with the human visual perception characteristics, a color image compression algorithm combined the human visual contrast sensitivity characteristics is proposed. Firstly, combining the characteristics of human visual contrast sensitivity and spectrum coefficients in transform domain of image, a method for calculating the angular frequencies of the images is proposed, and the calculating method of minimum error threshold of human eye detecting images is proposed according to the angular frequencies. Then taking the threshold as quantization step size, a method is proposed to quantize spectrum coefficients in transform domain of image. Finally Huffman coding algorithm is adopted to carry out encoding and decoding to realize image compression. And the simulation experiments for three color images is carried out. The results show that the average compression ratio, PSNR and SSIM of three color images and each component of the image are increased by 10.4807%, 6.9879% and 2.6494% respectively, compared with the technology of JPEG. It indicates that the image compression algorithm combined the human visual characteristics is better and more practical.关键词：image compression;human visual system characteristics;spatial frequency;structural similarity index measurement
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发布时间：2020-08-12 - 摘要：In order to solve the problem that the color-histogram based multi-target tracking is poorly adaptive to the complex scene and easy to lose the target, a multi-target tracking which combines the color-histogram and edge-direction-histogram is proposed in this paper. Firstly, the algorithm adopts a cell-based connected component labeling algorithm to extract the multiple targets and obtains the color and edge features of the targets. Then we combine the color and edge features to describe the target appearance models. Finally, the target models are updated in the tracking process. The experimental results show that the algorithm can complete the stable tracking when the target undergoes the scale variation, illumination changes, pose variation and rotation. And the algorithm has a strong robustness. We perform our algorithm on 3 challenging video sequences in the experiment, when the targets number is chosen to 2 and the target window size is 64 pixels×64 pixels, the maximum speed of our approach can reach 20 fps and it can mainly satisfy the real-time tracking requirement.关键词：multi-target tracking;color-edge histogram;connected component labeling
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发布时间：2020-08-12 - 摘要：In remote sensing image automatic registration, there are some problems, for example, there are differences between texture image itself and unevenness in feature points extracting. To this problem, the paper proposes a new high precision automatic registration method of multi-source remote sensing image. First of all, the Harris operator was improved to extract feature points covering a wider range; and then, the image is divided into blocks, using the improved Harris operator to extract feature points for each block, and then use the block iteration to eliminate wrong feature points, ensuring the distribution of feature points is uniformly and non redundant in the whole image. Secondly the paper put forward the pyramid-bidirectional-least squares matching algorithm for image matching, completed selection of the final corresponding points. Finally, the paper made use of the TIN to complete accurately correction. The experimental results show that the proposed method of the paper can ensure the corresponding points uniform and reasonable, and it can achieve high precision registration of multi-source remote sensing image, which has certain practical significance.关键词：remote sensing image;Harris operator;automatic registration
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发布时间：2020-08-12 - 摘要：LCD Mura defect is difficult to detect. It has the features of low contrast, uneven brightness, blurry edge, and so on. The traditional Chan-Vese model (C-V model) cannot accurately segment the Mura defect and the segmentation speed is slow. In order to solve the problems, this paper presents an improved C-V model. First of all, according to the theory of curve evolution, the image data force in the traditional C-V model is simplified to reduce the iterative process of calculation and improve the segmentation speed. Secondly, in order to reduce the effect from non-uniformity brightness of image, the model is proved by adding a new energy term that related to the brightness difference between inside and outside area of the contour curve to improve the accuracy of the segmentation. Finally, the iterative stopping criterion is introduced in the implementation process of the algorithm, the setting of the segmentation accuracy can aid both in achieving the automatic iteration stop and segmenting the target correctly. Experimental results indicate that improved C-V model in this paper can accurately segment the background uneven Mura defect and it has a faster speed.关键词：Chan-Vese model;LCD Mura defect;uneven brightness
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发布时间：2020-08-12 - 摘要：As traditional way for pupil recognition based on Hough transform circle detection has lower accuracy and speed, an improved method is proposed in this paper. After edge detection by Canny operator, Hough transform is performed in a limited radius. Within this range, finding the best fitting circle based on the circle equation in parameter space to get the center coordinates and radius, pupil recognition and center positioning are achieved ultimately. 150 images are used to test the effects of pupil recognition under vc++6.0 development platform. The experiments results show that the accuracy is 70.7% with an average speed of 1 s based on Hough transform which is used directly. In comparison the accuracy is 94% and the average speed is 0.45 s with the method proposed in this paper. It indicates that this method has a significant improvement on accuracy and speed. It can recognize the pupil and locate the center faster and has more accuracy.关键词：Hough transforme;circle detection;pupil recognition;center positioning
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发布时间：2020-08-12 - 摘要：In order to solve the inaccuracy problem of traditional color-signal conversion methods from CIELAB space to Munsell system, a new hierarchical conversion algorithm based on structure correlation analysis was proposed. Firstly, this article evaluates the structure correlation between CIELAB space and Munsell system by using the Pearson coefficient. Then on the basis of structural correlation evaluation, this article uses a hierarchical conversion algorithm to get the corresponding Munsell V, H, and C color mark of the CIELAB color signal. In addition, the algorithm proposes a new method by choosing the nearest interpolation H values during the second conversion step to ensure the calculation precision. The experimental results of 2735 test samples show that the new algorithm has good calculation accuracy and reliability, and can be widely used in different kinds of color signal transmission and image processing system.关键词：cross-media;image signal processing;numerical analysis;CIELAB color space;Munsell system
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发布时间：2020-08-12
Display and Image
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