最新刊期
期 5 ， 2016
- 摘要：In order to improve the solubility of iridium complex, at the same time exhibit high thermal stability, propylcydohexane was introduced into the main ligand to synthesize a novel red phosphorescent iridium(Ⅲ) complexe Ir(pcpiq)2acac (pcpiq=1-(4-(4-propylcyclohexyl)phenyl)isoquinoline, acac=acetylacetonate).The photophysical, thermal, and electrochemical properties of the material were investigated by UV-Vis absorption spectra, fluorescence emission spectra, differential scanning calorimetry (DSC) and cyclic voltammetric method. Additionally, the synthesized iridium(Ⅲ) complex was used as a red light-emitting dopant material with 4~12% doping concentration in emissive layer to fabricate organic light-emitting diodes (OLED) by vacuum deposition or spin-coating method. The test results showed that the OLED by vacuum deposition obtained an electroluminescence (EL) maximum at 639 nm, a maximum current efficiency of 6.11 cd/A, a maximum power efficiency of 1.64 lm/W, and a pure red color with the CIE coordinates of (0.68, 0.32), when Alq3 was used as the host material.关键词：Iridium(Ⅲ) complex;propylcylohexane;red phosphorescent;OLED
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发布时间：2020-08-12 - 摘要：In the traditional Process of TFT-LCD, H Cloth is always used to improve Rubbing Mura in the production of High PPI ADS Products,but when H Cloth is used, the White Mura Defect will appear after Rubbing Cleaner. By analyzing of White Mura Defect micro appearance and the nature of H Cloth, the White Mura Defect is caused by the gathering effect of Acetate Polymer after Rubbing Cleaner. In this paper, we change Acetate from Hydrophobic to Hydrophilic by changing the surface property of glass in the Rubbing Cleaner (alcohol can effectively change the interface property) and the Acetate Polymer particle is easily to be cleaned. In actual production, we replace IPA at regular period to keep the IPA concentration in stable range. As a result, the White Mura is effectively improved and controlled and the defect ratio is greatly decreased from 3.42% to 0.11%.关键词：High PPI;white Mura defect;acetate polymer;hydrophobic
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发布时间：2020-08-12 - 摘要：Based on flexoelectric effect theory, a comparative study of monochromatic light on flicker shift of ADS mode TFT-LCD has been conducted. The flicker shift and TFT photo leakage current [photo Ioff] features have been mainly investigated with monochromatic red, green, or blue backlight in the same energy as well as under different brightness conditions. The results indicated that Ioff changing in the normal range did not significantly affect the amount of flicker shift, it was preliminarily believed that the difference of the amount and generating rate of ions under different light conditions is the main factor resulting in flicker shift under this condition.关键词：monochromatic light;flicker shift;TFT light leakage current
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发布时间：2020-08-12 - 摘要：Based on the flexoelectric effect, the illumination influence on the flicker shift of the Advanced Super Dimension Switch (ADS) Mode Thin Film Transistor-Liquid Crystal Display (TFT-LCD) has been studied in this paper. First, this article researched the flicker shift of LCD under the condition of the standard backlight brightness, then tested the flicker shift of the samples without backlight or reducing the backlight brightness. Finally, this article studied the influence of lighting panel after a period of time on flicker shift. The experimental results showed that the illumination makes cell to generate ions. Due to liquid crystal polarization, a force will emerge when driving signal voltage exists. The existence of the force will cause ions to be accumulated, forming residual DC which results in flicker shift. Flicker shift will weaken as backlight brightness decreases. These results have great guiding significance for LCD system design and display quality improvement to a certain extent.关键词：flexoelectric effect;illumination;flicker shift
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发布时间：2020-08-12 - 摘要：Different TFT geometry design (top gate area coverage ratio, different channel shape and various W/L value) on dual gate a-Si TFT characteristics were investigated. Dual gate a-Si TFT shows better TFT characteristics than single bottom gate a-Si TFT with higher Ion 7%, lower SS 3% and comparable Ioff and stress stability. Dual gate TFT structure is an economic way to improve a-Si TFT characteristic without production cost up and additional process flow modification.The characteristics of top gate TFT is worse than bottom gate TFT due to a worse a-Si/PVX interface than GI/a-Si interface and may be improved by modifying a-Si/PVX process.关键词：HADS;A-Si;TFT;dual gate
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发布时间：2020-08-12
Material and Device
- 摘要：It is a key issue to select limited sampled grayscales to fit the curve accurately between the luminance and whole grayscales that affect the Mura improvement, real time, and cost of LCD panels. The limited sampled grayscales were optimized by the iterative method, and the influence of the optimized grayscales on the Mura improvement was investigated by the segmented gamma fitted method. To a 55 in TFT-LCD module with resolution of 1 920×1 080, the relative error in 0~255 grayscale between fitting and actual brightness curve decreases from 5.64 to 3.68 with optimization of six sampled grayscales and from 29.27 to 8.98 with optimization of four sampled grayscales. The experimental results of six and four optimized sampled grayscales on the mura improvement indicates that the mura improvement effect, real-time, and cost of LCD panels by using four optimized sampled grayscales are better.关键词：LCD;Mura defect;segmented gamma fitting
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发布时间：2020-08-12 - 摘要：A wearable motion recognition and evaluation device were designed base on TMS320F28335. The device can remind the user action whether it was correct by compared standard data with human motion and attitude data obtained by motion sensors MPU6050. Equipped with unique programmable coach mode which enable the collection and production of standard motion data, the device is suitable for physical training and rehabilitation of patients. The serial interface LCD is used as a display panel, which can display the acceleration, angle of the human motion and evaluation and analysis results of human motion posture. The hardware design and software flow chart of the liquid crystal display circuit are given. The experimental results show that the LCD display circuit interface is simple, easy to use, moderate size, to meet the requirements of wearable human motion trajectory evaluation.关键词：LCD module;wearable devices;movetrack recording;MCU
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发布时间：2020-08-12 - 摘要：A method of increasing shift frequency is proposed in LED display control system. Firstly, mathematical relationship of shift frequency, scanning frequency and effective reading frequency of SDRAM is established to analyze how to increase the former based on hardware logic. Moreover, a splitting and reorganization algorithm of image data is realized to promote shift frequency from 8.25 MHz to 66 MHz, which can maximize the performance of the LED driver chip, and the scanning frequency is also greatly improved.关键词：shift frequency;SDRAM;scanning frequency;split and reorganization
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发布时间：2020-08-12
Driving and Controlling
- 摘要：In order to overcome the disadvantages that total variation model based on the image gradient information can't consider image's local direction and remove noise effectively, an adaptive directional total variation model based on image's local direction is proposed,and the iterative procedure of model is deduced. First, the image local direction is calculated in this new model. Second, an ellipse coinciding with the dominant direction of the local image is used to replace the unit ball in the total variation model. Finally, the denoised image is obtained by using iteration to optimize the minimum total variation. The comparing experimental results show that the proposed model can get higher peak signal to noise ratio and enhance the image details, and it has good performance in image denoising.关键词：image denoising;total variation;optimal minimization algorithm;image local direction
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发布时间：2020-08-12 - 摘要：In order to solve inevitably multimodal issues and real time problems of traditional focus depth method used in aerial camera, a new method for auto-focus is presented. A focus model is established, and the method is verified by modeling and experiments. Firstly, a large number of different defocus degree of natural images, which are used as the overall sample, are collected. The sample patch from the overall sample is analyzed, and the desire template is got by iteration. Secondly, after the cam completes the coarse focus, the current image is acquired. Then, the sample patches are put into the template through sampling the current image, and the current defocus level is got by calculating defocus. Finally, according to the result of the defocus, the displacement of the actuator is converted. Then, the focus motor is driven to make the movement. The results show that the time to calculate defocus is 0.4 s, which has a great improvement compared with the traditional method whose focus time is 4~8 s. A real-time automatic focus method ensuring the focus accuracy is achieved.关键词：aerial camera;auto focus;image processing
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发布时间：2020-08-12 - 摘要：In order to meet the wavefront processing requirements of liquid crystal adaptive optics system which match 4 m astronomy telescope, a wavefront processor (LCWP) based on multi-GPU is developed. First, the liquid crystal adaptive optics wavefront processing method is described. The numbers of hartmann detector's microlenses, Zernike modes and liquid crystal corrector's drive unit are analyzed, which need to match 4 m telescope. Then the wavefront processing methods based on multi-GPU are discussed in detail: single GPU method is used to calculate slope; block-column distribution method is used to fit Zernike coefficient; Zernike polynomial symmetry algorithm and block-row distribution method are used to compute gray map of liquid crystal corrector. Finally, the transfer function of liquid crystal adaptive optics system for matching 4 m telescope is analyzed and magnitude of the residual error transfer function is simulated. The latency of slope calculation is 18 μs, the latency of Zernike coefficient fitting is 39 μs and the latency of computing gray map is 114 μs. The total computing latency is 109 μs and temporal band width in our liquid crystal adaptive optics system is 53 Hz. It is shown that our LCWP based on multi-GPU has the ability to match 4 m astronomy telescope.关键词：GPU;liquid crystal;adaptive optics
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发布时间：2020-08-12 - 摘要：In order to solve the tracking of the variable scale object, a novel tracking algorithm with scale invariance is proposed in this paper. First, the tracked object in the initial frame is expanded to the size of the specified template image by the means of interpolation. Then the low-dimensional Haar-like features of the expanded object are extracted by compressive sensing and used as template features, and the classifier is initialized at the same time. Second, the target's center and scale variation in the frame to be processed are predicted by Kalman filtering. After that, object samples with different scales are collected around the predicted target center above and the low-dimensional Haar-like features of the object samples are extracted by compressive sensing. Finally, the low-dimensional Haar-like features are sent to the classifier to get the tracking target and the classifier is updated at the moment. Experiments show that the average success rate is 77% and the average center location error is 12 pixel. It indicates that the object tracking method proposed above is effective on the tracking of the moving target with scale variation.关键词：machine vision;object tracking;compressive sensing;variable scale;Kalman filtering
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发布时间：2020-08-12 - 摘要：Although the dark channel prior algorithm is effective to some extent for single image dehazing, the algorithm has some disadvantages of running a long time. Besides, the calculation of environmental light is not very accurate, and not suitable for the sky area, which can lead to the color distortion and dim brightness for the restoration image. Aiming at theses hortcomings, this paper presents an optimization algorithm. Firstly, the environmental light is calculated by the improved White Patch Retinex algorithm. Secondly, the transmittance is obtained based on the dark channel prior. Finally, according to the atmospheric scattering model, the final haze-free images are obtained. Experimental results show that the proposed algorithm has a shorter running time. The average processing time of the image (600×800 pixel) is about 5 s.The problem of color distortion for the sky area can be well solved.After defogging, the image has high brightness and contrast.关键词：dehazing;dark channel prior;improved White Patch Retinex algorithm;guided filtering
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发布时间：2020-08-12 - 摘要：The paper proposes a method of vehicle detecting and tracking in complex environments. Firstly, by analyzing the vehicle external feature, the geometrical shape parameters extracted from its Blob blocks are employed to detect the moving vehicles. Then, vehicle tracking method is presented based on Blob analysis and CamShift algorithm. Experimental results show that the proposed method can detect the target vehicle and distinguish the vehicle and pedestrian accurately. The precision rate of vehicle detecting and tracking achieve 96.7% and 86.7% respectively, which prove that the method is appropriate for the demand of vehicle detecting and tracking in complex environments.关键词：moving object detection;vehicle detecting and tracking;Blob analysis;CamShift
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发布时间：2020-08-12 - 摘要：In order to optimize the effect of solid-state volumetric true 3D display and show even more realistic 3D images, this paper researched the grayscale of coded images and the contrast of display volume. The paper introduces solid-state volumetric true 3D display's circuitry system, optical projection and the imaging display volume, according to the imaging principle of solid-state volumetric true 3D display. After analyzing and studying the main influences on the effect of 3D display, we come up with two methods to improve it. One way is reducing the image refresh rate and increasing the number of encoded image's bits to improve the pixel's gray level. Another method is changing the thickness of the liquid crystal light valve to enhance the contrast of the display volume. On the model machine of true 3D display, we not only succeed in achieving 32 levels of grayscale to increase the range of color from 4 096 to 32 768 and improve 1.2 times on contrast compared to the original model machine, but also can feel richer details and colors in image. The optimizing effect is obvious, and it make the machine show the details much clearly, the colors richer and the effect of 3D images more realistic.关键词：solid-state volumetric true 3D display;grayscale;liquid crystal light valve;contrast
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发布时间：2020-08-12
Display and Image
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