最新刊期
期 9 ， 2018
- 摘要：
In the large-size TFT process technology, Cu gradually replaces Al as the electrode material. However, compared with Al electrode, Cu is more prone to corrode in Gate process reducing product yield. In this paper, Cu corrosion in Gate etch process of 0+4 mask technology and Gate strip process of 1+4 mask technology is analyzed when it comes to ADS display mode. Combined with experimental verification, the reason of Cu corrosion is determined. Finally, improvement programs are proposed. Experiment results sh 关键词：Cu electrode;Cu corrosion;Galvanic effect;etch process;strip process- 427
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- 90
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- 4
发布时间：2020-07-06 - 摘要：
The nitrogen-containing aromatic ring serves as the polar mesogenic group of the liquid crystal molecule, which can effectively increase the dipole moment of the molecule and improve molecular dielectric anisotropy, reduce LCD drive voltage. It also increases the interaction between molecules, which is conducive to the formation of smectic phase states. In this paper, we designed and synthesized two series of two aromatic liquid crystal compounds, nOBMm and nOBPm series, with pyrimidine and pyridine as the 关键词：pyrimidine ring;pyridine ring;smectic phase;liquid crystal compounds;synthesis- 339
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- 0
发布时间：2020-07-06 - 摘要：
An exclusive quantitative analysis was performed to survey the changes of the three color components (brightness, hue and color saturation) on screen film. The spectral distributions of LCDs and OLED screens at different color temperatures (2 700 K-6 500 K) were measured by the spectral transmittance variations of polyethylene terephthalate (PET) and pulsed electron beam deposition (PED), and then the spectral distribution of the screen and the membrane transmissivity function were fitted. Calculation and q 关键词：displays;screen protectors;spectroscopy analysis;colorimetry- 394
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- 29
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- 1
发布时间：2020-07-06 - 摘要：
Voltage holding ratio is one important reliability property of liquid crystal mixture, especially relatively higher VHR value can generally relate to better line image sticking performance. In this paper, we focus on studying the effect of alignment material, charging voltage and temperature on LC mixture's VHR dependency. The experiment is based on test cell measurement result. We use test cell which is made by different PI material for measuring VHR of negative Δε LC mixture in various voltage and tempera 关键词：negative liquid crystal mixture;VHR;PI;voltage;temperature- 400
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- 85
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- 0
发布时间：2020-07-06 - 摘要：
The pyrimidine ring outside of the rigid core ring of liquid crystal molecules used as a polar mesogenic group, can effectively increase the molecular dipole moment and intermolecular force, improve the dielectric anis-otropy of the compounds, reduce the driving voltage of the liquid crystal, and also favor to form some smec-tic phases. In this paper, where pyrimidine acetyleneisused as the central structural unit and isothiocyanide asthe end group, we could see that a series of liquid crystal compounds (nB 关键词：pyrimidine acetylene;high dielectric anisotropy;smectic phase liquid crystals;high optical anisotropy;synthesis- 332
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- 26
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- 1
发布时间：2020-07-06 - 摘要：
In order to prepare ZnO nanowires with excellent field emission performance, the growth mechanism and field emission performance were studied. Firstly, the high aspect ratio ZnO nanowires were prepared by the optimized two-step method. Secondly, the morphologies of ZnO were characterized by SEM. Then, based on the analysis of the morphological features, the rapid growth mechanism of the ZnO nanowires film under strong alkali conditions were described. Finally, the field emission performance of a typical sam 关键词：ZnO;nanowires;growth mechanism;field emission- 301
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- 17
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- 0
发布时间：2020-07-06 - 摘要：
It needs a wider beam in laser ranging, laser communication, laser holography and so on, but the laser beam is in the millimeter scale, therefore, collimating and expanding the beam of the laser beam is needed. This article provides a variable-rate laser beam expanding method based on LC-SLM. Using LC-SLM to produce the wavefront of a lens, The phase modulation graph of the zoom lens with different focal length is simulated by the computer. It is loaded on the LC-SLM, and the change of the LC-SLM applied vo 关键词：laser beam expanding;Liquid crystal spatial light modulator;Zoom lens- 331
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- 24
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- 6
发布时间：2020-07-06
Material and Device
- 摘要：In order to meet the requirement of image acquisition and testing of infrared imaging equipment with special data format, a PCI bus image Acquisition system was developed. The Field-programmable Gate Array (FPGA) chip is used as the main controller to realize signal acquiring and data processing, and PCI9054 is used to translate the data to the host computer of the system. The host computer identifies the head and tail of frame data according to the communication protocol, reconstructs and displays the image. The experiment results show that when the resolution of image is 128×128, pixel grayscale depth is 16 bit, the system can acquire the infrared image with the speed 100 fps stably, and the design satisfies the requirement of using.关键词：FPGA;PCI9054;image acquisition;PCI bus
- 312
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- 16
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- 1
发布时间：2020-07-06 - 摘要：
Aiming at the problem that small constant current source power, inconvenient dimming, and the noise caused by its switching characteristics is large, an intelligent optimized constant current driving design method with small size, high power, and good ripple effect is proposed. The design is improved on the basis of the previous low current, and the switching characteristics of the output current are converted to linear through feedback regulation, supplemented by switching the RCD loop (peak absorption loo 关键词：LED constant current drive;high power;low noise- 322
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- 24
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- 2
发布时间：2020-07-06 - 摘要：Aiming at the problem of real-time traffic flow in the road, an improved algorithm for moving vehicle detection based on frame subtraction was proposed, and the algorithm was successfully transplanted into the embedded system. The Frame subtraction was combined with vehicle tracking algorithm using length, width, area selection contour and centroid distance to realize the detection of moving vehicle. The U-boot program, Linux kernel, Yaffs2 file system and detection algorithm were transplanted to the S3C6410, and the traffic video was collected through the camera, and the detection results were displayed by the touch-screen. The real-time test results of complex traffic scene show that the detection time of the system is 0.298 seconds/frame, and the accuracy rate is over 88%, which can basically realize the real-time vehicle flow detection in the road scene.关键词：frame subtraction;traffic flow detection;S3C6410;real-time detection
- 300
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- 17
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- 2
发布时间：2020-07-06 - 摘要：
In order to solve the problem of low recognition rate and poor positioning in aerial images, a target detection method based on deep learning is proposed. This algorithm uses VGG16 network as a fine tuning network and adds some deep network in it. Joint training is carried out by extracting the features of the shallow layers and the deep features of the target to overcome the contradiction between location and recognition in the process of detection. The singular value decomposition technology is used to co 关键词：machine vision;target detection;convolutional neural network;convolution feature- 385
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- 40
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- 17
发布时间：2020-07-06 - 摘要：
Enhancement of fingerprint image near the singularity point is a big challenge in the fingerprint image enhancement. However, the ridge structure near the singular point of the fingerprint can be destroyed by the current Separable Gabor filter algorithm. And the performance in repairing the fingerprint ridge is bad by the current directional Fourier filter algorithm. These result in the bad performance in fingerprint image enhancement of the current Separable Gabor filter algorithm and Fourier filter algori 关键词：fingerprint enhancement;directional Fourier filter;separable Gabor;fingerprint singular point- 304
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- 17
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- 1
发布时间：2020-07-06 - 摘要：
With the rapid development of virtual reality and multimedia communication technology, omnidirectional video has become a major form of immersive media. Due to the sense of presence and immersion provided to the end users, omnidirectional videos have been widely applied in many fields including entertainment, education, industrial simulation, and medicine. To facilitate the research on omnidirectional videos, establishing an interactive omnidirectional video display system is an important precondition. Base 关键词：Omnidirectional video;interactive rendering;display system;visual experience;OpenGL- 311
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发布时间：2020-07-06 - 摘要：
In order to enhance the display effect of High dynamic range image (HDR), this paper proposed a multi-scale gradient domain color mapping algorithm. Firstly, the luminance information of high dynamic range images is extracted, and the luminance data of high dynamic range images are decomposed in multiple scales by bilateral filtering, and the basic and detailed layers are obtained. Since the change of visual brightness is reflected in the gradient of image data, the adaptive dynamic range compression of bas 关键词：high dynamic range image;multi-scale image decomposition;image filter;gradient compression;tone mapping- 405
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发布时间：2020-07-06
Image Processing
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