最新刊期
期 4 ， 2016
- 摘要：The auto-focusing devices in TFT-LCD glass substrate line detection process have problem of blurred image. In order to solve this problem, the application of image based on auto-focusing method in TFT-LCD glass substrate detection process was presented. Based on the optical detection of the TFT-LCD liquid crystal panel, this paper mainly introduces several typical image processing algorithms based on image processing. The focusing evaluation functions are compared and analyzed quantitatively through experiments in the aspects of unique value, unbiased, sensitivity and calculation speed. An evaluation method combining coarse and fine adjustment is presented. The Lean operator and Brenner operator were respectively chosen as the focus measure method of coarse and fine adjustment. The result show that when a lens of 15 steps focus length for local full search is used, traditional single algorithm takes 2.18 s, the new method takes 1.41 s, and get clarity-evaluation function value is 52.49 higher than 46.78 of traditional single algorithm. This method is not only high focusing accuracy, a greater focus range, but also can ensure high computational efficiency.关键词：auto-focusing;clarity-evaluation function;computational efficiency;digital image processing;coarse and fine adjustment
- 21
- |
- 18
- |
- 3
发布时间：2020-08-12
Invited Paper
- 摘要：A color-filtering liquid crystal shutter was investigated basing on polymer-stabilized cholesteric texture (PSCT) doped with dichroic dye. The PSCT with dye-doped liquid crystals was prepared by means of polymerization induced phase separation (PIPS). With the absorbing effect of three kind dyes in visible region, the different colors of the emergent light were obtained by the selective absorption and filtering to the white incident light. The results indicate that the absorption of dye in the planar state was enhanced because of the periodic helical texture, leading to the independence on the polarizers. The PSCT performed the color state while the PSCT was transparent in the homeotropic state. The PSCT had intrinsic contrast ratio and didn't need the polarizers. The PSCT could switch rapidly between the planar state and the homeotropic state with the respond time shorter than 7 ms. The PSCTs could be used for the color-filtering devices. Under the co-effect of three kind dyes, a colorful display consisted of the different emergent light is gained.关键词：polymer-stabilized cholesteric texture;color-filtering;fast respond
- 38
- |
- 35
- |
- 0
发布时间：2020-08-12 - 摘要：Oxymethylene-bridged negative liquid crystal has been widely used in VA-TFT mixtures owing to its relatively large negative dielectric anisotropy, low viscosity and good phase solubility with other liquid crystals. However, the long synthetic route and difficulty in purification have been obstacles in application. In this paper, three oxymethylene-bridged negative liquid crystal compounds were synthesized via the etherification reaction of 4-ethoxy-2, 3-difluorophenol with different alkylbenzene sulfonate. The method effectively avoids impurity resulting from the introduction of halogen ions in conventional method. All key compounds were characterized by 1H NMR spectroscopy. The liquid crystal properties, such as phase transition temperature, optical anisotropy and dielectric anisotropy were measured by DSC, TPOM and LCR testing analyzer.关键词：liquid crystal;oxymethylene;bridge bond;negative liquid crystal
- 22
- |
- 19
- |
- 2
发布时间：2020-08-12 - 摘要：The influence of the helical twisting power (HTP) on the morphology and electro-optical properties of normal-mode polymer-stabilized cholesteric texture (NB-PSCT) was investigated. In this study, PSCT was prepared by the means of polymerization induced phase separation (PIPS). The three PSCTs were in same pitch length by controlling the weight ratio of chiral dopants with different HTP, respectively. The investigated results suggested that as the value of HTP increases, the polymer networks become tighter, which leads to the reduction of the threshold voltage and saturation voltage, and the increase of the field-off response time and hysteresis width. It is attributed mainly to the stronger elastic force between the LC molecules and polymer networks.关键词：polymer-stabilized cholesteric texture;helical twisting power;electro-optic property;morphology of polymer network
- 47
- |
- 30
- |
- 0
发布时间：2020-08-12 - 摘要：In order to adapt to the trend of ultra-high resolution and extremely fine wiring of LTPS TFT LCD display, reduce the yield loss generated by via etching process of LTPS TFT interlayer dielectric, and improve the production quality, the process optimization of via etching process of LTPS TFT interlayer dielectric was investigated. The experiments were based on dry etching as the main etching step assisted with wet etching. It not only conbined with the excellent control of profile and feature size of dry etching but also got high etching selectivity of wet etching. The experiments also aimed at reducing the damage and defects reduced by dry etching and avoiding pollution of the hole surface by etching by-products. Experimental results indicated that dry etching assisted with wet etching basically solved the problems of over etching and etching residual, reduced the yield loss of via etching defect rate by 73%. And contact resistance reduced by about 90%, ON-state drain current raised 15% of the dry etching. Therefore dry etching assisted with wet etching is an innovative method to optimize the via etching process and promote product performance.关键词：LTPS TFT LCD;dry etching;wet etching;via etching of interlayer dielectric;contact resistance;device performance
- 64
- |
- 56
- |
- 2
发布时间：2020-08-12 - 摘要：Effects of TFT structure on HADS product TFT properties was investigated. TN 5 mask and reversed HADS structure (SD pixel ITO) shows higher Ion about 40% than current HADS structure (pixel ITO SD). The lower Ion of current HADS structure (pixel ITO SD) may result from higher N+/SD contact resistance due to damaged N+ surface result from pixel ITO process on N+ surface. For current HADS structure, less ITO remain before channel formation leads to a lower Ioff, while it shows no effect on TFT characteristic as ITO remain stays on formed channel for reversed HADS structure (SD pixel ITO). The current HADS structure shows a 50% lower Poole-Frenkel leakage current and lower Poole-Frenkel I-V slope than TN 5mask and reversed HADS structure (SD pixel ITO) also due to a higher N+/SD contact resistance.关键词：HADS;A-Si;TFT;Poole-Frenkel
- 99
- |
- 90
- |
- 2
发布时间：2020-08-12 - 摘要：With the increasing requirements from large-size and high-resolution flat panel displays (FPDs), it is necessary to investigate and develop the low-resistance electrodes for amorphous InGaZnO (a-IGZO) thin film transistors (TFTs). In this study, the inverted staggered a-IGZO TFTs using Ag as source/drain (S/D) electrodes were designed and fabricated by magnetron sputtering. It was found that the a-IGZO TFTs with single-layer Ag S/D electrodes exhibited poor performance due to the bad contact between Ag and a-IGZO. On the other hand, the Ag/Ti electrodes, formed by inserting a Ti film between Ag and a-IGZO, could effectively prevent Ag diffusion and form good contact with the active layers. In fact, the a-IGZO TFTs with Ag/Ti electrodes showed much better performance (field effect mobility of 1.73 cm2/V·s, subthreshold swing of 2.8 V/(°), and on-off current ratio of 2×107) than those of the a-IGZO TFTs with single-layer Ag source/drain electrodes, proving that Ag electrodes could be potentially used in amorphous oxide TFTs.关键词：a-IGZO;TFTs;Ag electrodes;magnetron sputtering;FPDs
- 42
- |
- 36
- |
- 3
发布时间：2020-08-12 - 摘要：As the rapid development of solid volumetric true 3D display technology and the requirement of the display content higher and higher, this paper proposes an improvement encoding method of the solid volumetric true 3D display. The method offers three processing modes for virtual scene with depth of field:mode 1, the RGB values and the depth values are encoded, transmitted, decoded; mode 2, the RGB values are converted to YUV values, and then the YUV values and the depth values are encoded, transmitted, decoded; mode 3, the RGB values are converted to YUV values, then the YUV values and the depth values are to be encoded, last the encoded YUV values are converted to RGB values, and the RGB values are transmitted and decoded. The actual display test and transmission efficiency for the three kinds of modes are compared on the engineering prototype. The experiment shows that the three modes are able to meet stereo display requirements, the 3D images of mode 2 and mode 3 are more realistic and detailed, mode 2 and mode 3 coding efficiency are higher than that of the mode 1 for a few times. This method not only makes the generated sources more flexibility and universality, but also encoding YUV signals can be more fit for the human eye to the sensitive degree of brightness and make the color signal more abundant.关键词：solid volumetric true 3D display;RGB;YUV;color space mode
- 13
- |
- 15
- |
- 0
发布时间：2020-08-12
Material and Device
- 摘要：This paper mainly describes the important role of thin film transistor dielectric, and summarizes the dielectric material type and its characteristics in the thin film transistor application, describes the preparation process of different insulation layers, and the principle and characteristic between different processes. Finally, through analysis of the latest literature on thin film transistor dielectric, the paper summarizes the main problems encountered in the preparation process and the current research focus, and finally prospects the future research directions of the technology for preparing thin film transistors and the dielectric materials.关键词：thin film transistor;sol-gel process;UV annealing;low temperature process
- 63
- |
- 50
- |
- 4
发布时间：2020-08-12 - 摘要：In order to meet the displacement measuring requirement of the lithography machine wafer stageultra-precision motion control system, a BiSS-C protocol decoding method has been proposed, which is based on FPGA. The circuit design and experimental verification are carried out as well. Firstly, the BiSS-C protocol is analyzed and its configuration and data frame are presented in detail. Secondly, because of its characteristics of powerfulness and flexibility, FPGA has been used to realize the decoding function. The circuit to transmit the data of absolute encoderis is designed and applied on the CLE-AA grating-shape capacitive encoder. Finally, a comparison with the relative encoder of grating sensor is carried out. Experimental results indicate that the transmit rate of absolute encoder of the capacitive sensor is up to 10 kHz with the error limiting in ±5 μm. Its accuracy and reliability can satisfy the requirement of ultra-precision motion control system.关键词：BiSS-C;FPGA;grating-shape capacitive ruler;encoder
- 22
- |
- 19
- |
- 3
发布时间：2020-08-12 - 摘要：A measurement method for real-time adjusting integer time of infrared camera is proposed. Since the image of target is a point and the gray value is verified severely, the relationship between light and gray values in different integer times is calibrated for the precision of radiation measurement and the linear curve of response is fitted. Then the algorithm for the diffuse image spot of target in the detector is proposed. Furthermore, the size and central position of the target are estimated accurately by matching the simulated image and the actual image obtained from the IR imaging system. The total gray value is got and the integer time is adjusted based on the relationship between light and gray value. The experiment result shows that the integer time of two different cameras is adjusted, the gray value is in the linear region and the frequency is 25 Hz and the real-time request in the high speed air vehicle is met.关键词：infrared camera;radiation measurement;small target measurement;integer time
- 17
- |
- 14
- |
- 1
发布时间：2020-08-12
Driving and Controlling
- 摘要：Aiming at the problem that gray control algorithm can't draw accurately a line whose endpoints do not in the center of a pixel, combined with the Wu algorithm, an anti-aliasing algorithm for arbitrary-endpoint line based on gray control is proposed. Firstly, Wu algorithm and gray control algorithm are introduced in the paper. Through analyzing the both algorithms, advantages and disadvantages of them are proposed. Then, combined with the Wu algorithm, a new algorithm based on gray control is put forward. The new algorithm reduces the calculation of distance and gray transformation, solves the anti-aliasing problem of arbitrary-endpoint line. Finally, the efficiency and anti-aliasing performance of the new algorithm is simulated. The simulation results show that the new algorithm has higher efficiency than the Wu algorithm, consuming time is reduced by an average of 33.91% when drawing a line, and is more accurate and has better anti-aliasing effect than the gray control algorithm. Especially in the process of line's moving, the algorithm has a good dynamic display effect. The new algorithm proposed in this paper has higher efficiency, better display effect and very high application value.关键词：anti-aliasing;gray control;Wu algorithm;arbitrary-endpoint line
- 16
- |
- 12
- |
- 0
发布时间：2020-08-12 - 摘要：For the imperfection of traditional block matching algorithm requiring large amount of computation, being more sensitive to light changes and having poor real-time, this paper conducts some related study about block-matching algorithm and proposes an improved algorithm. In this paper, block-matching algorithm is studied and an improved algorithm is proposed. First, two color images are converted to gray images, and the edge image is obtained by probabilistic relaxation labeling algorithm, to get the motion region by calculation difference image of two adjacent images. Then the edge information of moving region can be obtained by AND operation using the difference image with the edge detection image, and get the displacement vector by match operation, the vector median filtering is carried out. Finally, the moving vehicles can be obtained by region growing. Experimental results indicate that the average detection time of this method is reduced by about 58 ms compared with the traditional method, while the average detection rate is increased by about 6.7%. This algorithm has strong robustness, good real-time performance.关键词：vector median filter;moving vehicle detection;probability relaxation labeling algorithm
- 17
- |
- 15
- |
- 0
发布时间：2020-08-12 - 摘要：The infrared imaging technology has become the main stream research direction of the intelligent photoelectrical detection due to its advantages. However, the image of infrared dim-small target has less details and low signal to noise ratio, so super-resolution restoration algorithm is used to provide more detail information. This paper analyzes the basic principles of POCS (Projection Onto Convex Sets), for its characteristics of long running time, an improved algorithm is proposed. First, we use histogram fitting to select the target area, then use super-resolution restoration in the target area and bilinear interpolation outside the region. Finally, three groups of low resolution images with five frames in each group are used to test the performance of the proposed method. As can be seen from the experimental results, the calculation speed of the proposed algorithm increased about 15.6%, 45.5% and 46.5% respectively. In conclusion, this method can effectively reduce the processing time of the super-resolution restoration algorithm.关键词：infrared dim-small target;projection onto convex sets;region selection
- 22
- |
- 13
- |
- 4
发布时间：2020-08-12 - 摘要：In order to achieve long distance transmission with high reliability while reducing complexity, HD-SDI transmission and displaying system for video derived from Camera Link Full interface were researched in detail. FPGA was the core processor. Considering the feature of multi frame rates of the camera, frame rate detection and frequency reduction policy were adopted to preprocess the video. The preprocessed data was buffered by use of three SRAMs to complete the conversion of frame rate. The result met the 25 Hz requirement of HD-SDI. Duo to the bus width of SRAM, FIFO line buffer policy was selected to transfer data from Camera Link Full80, which was 80 bits with 10 tap, to data of 8 bits with single channel. At last, the system was designed and verified in experiment. The experimental result shows that video of multi frame rates from Camera Link Full80, which includes 50 Hz, 100 Hz, 500 Hz, is converted to the form of 1080i for HD-SDI. The video could be displayed in real time without distortion, and image is clear and structured.关键词：Camera Link Full;HD-SDI;FPGA;three buffer;video encoding
- 13
- |
- 13
- |
- 2
发布时间：2020-08-12
Display and Image
- Address：No.3888 Dong Nanhu Road, Changchun, Jilin, China 130033 Postal code：130033
- Tel：0431-86176059 Email：yjxs@ciomp.ac.cn
- Technical support is provided by Beijing Founder electronics co., LTD 吉ICP备11002662号-17
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0