最新刊期
期 4 ， 2012
- 摘要：A simplified model of the nano-structured polymeric surface was proposed, characterized by a one-dimensional periodic stripe patterned surface with alternate planar and homeotropic anchoring. This paper investigated the effect of both the coupling of nematic liquid crystals with alignment layer polymers and the coupling of the polymers with the substrate surface, on the anchoring of nematic liquid crystals at such a surface, using the extended anisotropic surface energy form proposed by Alexe-Ionescu et al. In our theoretical treatment, the equal anchoring strength of the two anchoring regions was assumed. The results show that the coupling of the polymer with the surface will affect the director field of the nematic, and reduce the relaxation distance as well as the total free energy of the system.关键词：nano-structured surface;surface anchoring;director distribution;pretilt angle
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发布时间：2020-08-12 - 摘要：The field induced stereo regular polymerization of polymer dispersed nematic liquid crystal both positive and negative dielectric character are experimentally studied, the picture in kind and polarizing microscope photograph of samples are given. The experiment results show that there are obvious distinguish with in different area of electric field applied or not, the electric field has the induced stereo regular polymerization action under the polymer dispersed liquid crystal sample preparation process. The experiment results are useful to understand the influence of polymer border condition to liquid crystal micro drop configuration, and are in a sense of gaining a good deal to design a new type liquid crystal display device.关键词：polymer dispersed liquid crystal;electric field induced;stereo regular polymerization;bi-stable;liquid crystal display mode
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发布时间：2020-08-12 - 摘要：A novel bifunctional poly-monomer materials, 4-(4-vinylphenyl) benzoic acid-(4-vinyl) phenyl ester was prepared by the esterification of 4-(4-acetylphenyl) benzoic acid and 4-acetyl phenol, then reduction of the resulting carbonyl containing ester and dehydrolysis. The former acid was synthesized by biphenyl via Friedel-Crafts, bromination, Grignard reaction and oxidation reactions, and the later 4-acetylphenol was prepared by anisole via Friedel-Crafts and methyl elimination reactions. The total yield based on biphenyl is around 7%~10%, and the target product and intermediates were characterized by 1H NMR and FT-IR, its liquid crystal properties was studied with Polarizing Optical Microscopy and Differential Scanning Calorimetry.关键词：4-(4-vinylphenyl) benzoic acid-(4-vinyl) phenyl ester;4-acetyl-4'-formylbiphenyl;4'-acetyl-4-biphenylcarboxylic acid;DCC-DMAP;liquid crystal
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发布时间：2020-08-12 - 摘要：A new photo-spacer applied in TFT-LCD production was introduced. This material not only could withstand greater deformation, but had a higher recovery rate than other material. Compared with the mass production material, it showed better heat tolerance at 230℃ for 20 min and its height reduction ratio was 3.04%. It also showed little dependent on column Spacer height in rubbing processes under the same production condition.
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发布时间：2020-08-12 - 摘要：The article describes the basic principles of the 3D display, highlights the current mainstream 3D display types, including glasses 3D technology and naked eye 3D technology. Glasses 3D technology contains anaglyphic 3D, polarized 3D and active shutter 3D; naked eye 3D technology contains parallax barrier 3D, lenticular lens 3D, directional backlight 3D and multi-layer display 3D. The realization methods of 3D images and applications of the different 3D technologies mentioned above are described. Advantages and disadvantages of the 3D technologies concerning liquid crystal display are discussed in details. According to the characteristics of liquid crystal materials and 3D liquid crystal display, rapid response property of liquid crystal materials used in 3D display panels are concluded. Also requirements of the optical anisotropy parameters of liquid crystal materials are summarized.关键词：3D display;glasses 3D display;naked eye 3D display;liquid crystal materials
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发布时间：2020-08-12 - 摘要：Due to its unique optical-electro properties, facile synthesis and stimuli responsiveness to the environment, chiral supramolecular liquid crystals based onintermolecularhydrogen bonding have been becoming one of the hot topics in domain of supramolecular chemistry and been winning more application in functional materials, nonlinear optics and biomedical science, etc. This paper presents a brief review on the rod-like hydrogen-bonding chiral liquid crystals (RHCLC). The molecular structure, chiral group, substituent group, flexible chain, stability of these hydrogen-bonded supramolecular complexes and their relation to the observed liquid crystalline phases are the main topics of this review. Recent research achievements about RHCLC sorted by hydrogen bonds groups such as carboxylic acid and pyridine are introduced. At last the future development of RHCLC is prospected.关键词：liquid crystal;hydrogen bond;chirality;rod-like;supramolecule
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：The use of silicon nitride (SiNx) in the field of touch sensor has been investigated in this paper. Silicon Nitride (SiNx) with different thickness is deposited on the surface of bare glass by plasma-enhanced chemical vapor deposition (PECVD) technology. Using theoretical analysis and experimental test method, this article illuminates the impact on the touch sensor of transmittance and macro-color caused by film thickness and the refractive index. The results show that the refractive index of SiNx has great impact on the average transmittance, while the film thickness has no obvious effect on it. The film thickness has great impact on transmittance at fixed-wavelength and the macro-color, and it is crucial to the process control.关键词：silicon nitride
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发布时间：2020-08-12
Table of contents
- 摘要：The traditional approaches of grayscale scanning are of low efficiency. Fractal scanning technique whose scanning efficiency reaches 100% overcomes this problem, providing a good solution to the big size and high grayscale of Flat Panel Display (FPD). This paper presents a control system with gamma correction based on fractal scanning method. The gamma correction was realized by lookup table (LUT) according to both FPD characteristic and visual characteristic.The verification was implemented by using a 32×32 pixels light-emitting diode (LED) panel as display window of the 1 280×1 024 pixels FPD. Theory and experiment results both show the method proposed in this paper could improve the FPD’s visual effect.关键词：flat panel display;fractal scanning;gamma correction;gray scale
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发布时间：2020-08-12 - 摘要：The technology principle of sub-row driving gray-scale modulation was introduced and was used in FED video displaying system. The low grey enhancement modulation focuses on the problem that the rising edge and falling edge duration during the row scanning pulse will result in the invalid column driving pulse and no luminescence screen, it causes the data loss of the low grey image which affects the display effect. By adjusting the display order of those sub-rows, and the timing order, eliminating the low grey information loss, the image quality can be improved. At the same time, because the low grey loss caused by the reaction time is existed in the display panel, the low grey loss is modified by the time compensation, so that the display quality of the image is improved. Combined with the human visual characteristics, the image enhancement technology based on the sub-row driving was proposed to improve the video image quality, and applied to the sub-row driving of FED, making the contrast of the video image increased, the image quality more delicate, closer to the human visual effect.关键词：field emission display;sub-row driving;low grey image enhancement;video displaying
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发布时间：2020-08-12 - 摘要：This paper proposed a wide viewing angle twisted nematic (TN) liquid crystal display (LCD) with a protrusion structure under the pixel electrode. The proposed LCD mode avoids the complex rubbing processes because of the protrusion which induces the multi-domain structure like the conventional multi-domain TN mode. As no voltage applied, the LC profile is the same as that of the normal TN cell, the LC molecules tilted four different directions to obtain the multi-domain structure while the operate voltage is applied. In this paper, the electro-optic characteristics is simulated using the professional software, and the results show that the proposed multi-domain TN LCD has the wide viewing characteristics and low color shift.关键词：multi-domain;twisted nematic;liquid crystal display;viewing angle
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发布时间：2020-08-12 - 摘要：Micro-structure on light guide plate is a key factor to realize the optical function of light guide plate. With the development of computer simulation technology, the new micro-structure designs are emerging, and molding technologies of micro-structure are developing with them. This paper introduced the basic types of micro-structure, molding methods and their development, at last, made outlooks to the development trends of molding technologies of micro structure on light guide plate.关键词：LCD;light guide plate;micro-structure;molding technology
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发布时间：2020-08-12 - 摘要：In the trend of miniaturization narrow frame and fine wiring structure, the TFT-LCD tends to developing for large margin of design and high real substrate utilization rate. The passivation layer deposit parameters were changed to decrease the size of via hole which connected the pixel electrode and drain electrode were studied. Through the experiments design of changing main parameters to minimize via hole of passivation layer(haze, undercut, Top-PVX deposit thickness, Top-PVX deposit pressure), a solution to minimize the via hole about 20%~30% without changing the etch conditions was found. The electronic parameter measurement was evaluated (Ion,Ioff,Vth,Mobility) and finally one better solution to minimize via hole size was obtained. Therefore, the products quality was improved also.关键词：passivation layer;etch;via hole
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发布时间：2020-08-12 - 摘要：Using the optical software TracePro, the light distribution of our self-developed integration package of LED is simulated. In order to optimize the light distribution and extraction of the model, the different shapes of lens and inclination of reflectors were analyzed. The results of simulation show that there is a strong impact on light distribution with different lens and reflectors. There is an uniform light distribution with the 45? reflector. The light extraction will be improved by lens, meanwhile the flat lens can achieve a higher light extraction. The 45? reflector with hemispherical lens can achieve a balance between light distribution and extraction.关键词：LED;Tracepro;packaging technology
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发布时间：2020-08-12
Device Physics & Device Technology
- 摘要：A high-power and high-brightness LED driver is developed for Color Sequential Liquid-Crystal-on-Silicon mini-projector. The LED chips are arranged in parallel due to the tendue requirement of the illumination system. However, the driving current can be around 10 A,which increases the design complexity of the LED driver. In order to solve this problem, a constant current source is developed, which is controlled by Pulse Width Modulation. The experimental results show that the driver can supply constant 10 A current with reaso-nable ripple wave and fast response character, which agrees well with the requirement of LED source.关键词：LCoS;color sequential;high power;LED
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发布时间：2020-08-12 - 摘要：An implementation method of controlling the liquid crystal display based on the SOPC is put forward. The method used the development environment of QuartusⅡ and NiosII to complete the design of system,hardware and software,realize the function of dot matrix LCD display module. In the LCD display with the font library,the theory of the Chinese word stock and English word stock were described. An application program example of graphical display was also provided. The design contains features such as highly reliability and easily portability. It is easy to change the display of dot matrix LCD display module and expand the displayed content by making a little change.关键词：SOPC technology;dot matrix LCD;Quartus Ⅱ;Nios Ⅱ
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发布时间：2020-08-12 - 摘要：In order to be convenient for industrial application, the stepping motor controller with human-computer interaction was designed. The controller has its special instruction set. User could accomplish the design of application program, selection of self-defined images and the setting of registers by using the program compiling software running on PC. With the serial bus, aforesaid information was sent to stepping motor controller by program compiling software and stored in nonvolatile memory. The application program was read, interpreted and executed by stepping motor controller. The LCD of the system displayed operating information in real time. Also, keyboard was included in the system, so the user could modify the program or register parameter in the field. The Cortex-M3 based ARM controller,which had rich on-chip peripherals, was the core of the system. The design of system instruction set, human-computer interaction keyboard,nonvolatile memory and the LCD were analyzed in detail. At last, the system displaying result was given. The test result shows that LCD displaying information is synchronous to user command, and data storing of the nonvolatile memory is reliable. This system runs well in the application.关键词：human-computer interaction;stepping motor controller;LCD;nonvolatile memory
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发布时间：2020-08-12 - 摘要：This paper mainly introduces the segment type liquid crystal display principle and control methods in design and application of digital display instrument. The liquid crystal display system made by Texas Instruments with ultra low power microcontroller CC430F6137, which has a segment type LCD controller, can drive 96 segments at most. The GD46532 LCD module is designed by DaLian JiaXian electronic Co., Ltd. The authors design the driving program in temperature sampling system, and also give the twinkle display way to display the value of sampled temperature. By application testing, the digital instrument with LCD controller can reduce the system size to the largest extent. The system is high reliable. Its program is easily portable in other systems.关键词：CC430F6137;LCD display;digital meter;reliability;segment type
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发布时间：2020-08-12 - 摘要：Based on double-helicoid swept-volume display system, this paper proposes and implements a 3D datasets volume visualization scheme in real stereoscopic space. Homogenous image space is created by the screen’s rotational scanning. In rendering process, 3D regular discrete data is subdivided into a series of helicoid slices evenly. Then each data slice is rendered into an image frame separately. The rendered images are projected into the imaging space in rapid succession through a high-speed projector. By using multi-thread technique, synchronization between projected images sequence and screen’s rotation is achieved. Finally the whole spatial image is scanned out layer by layer. The experimental results show that elements of the presented spatial images are uniformly distributed and well defined. All three dimensionalities of the images are reserved inherently; this approach offers omni-directional viewing freedom around the display.关键词：volumetric display;3D datasets;visualization;layered scanning
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发布时间：2020-08-12 - 摘要：This paper studied the applications of volumetric three-dimensional display in medical imaging. Original images acquired by DSA,CT and MRI are used as the data source. After being segmented and reconstructed, volumetric three-dimensional images data are conversed. Computer vision is used to develop interactive teaching system. Being able to show three-dimensional medical images identical with organs and tissues and to carry on interactive simulation operation, a medical simulation and education system is built based on volumetric three-dimensional display technique. Volumetric three-dimensional display technique, which will be an important tool in medical education and simulation, is able to provide a platform of practice for medical education.关键词：true 3D;swept volume;visual voxel;three-dimensional reconstruction
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发布时间：2020-08-12
Driving & Controlling
- 摘要：This article takes apart the reason which a serial of the IR images comes into being non-uniformity (speckle) background in the light of the characteristic and using of IR camera. It analyses the merit and defect on traditional non-linear correction methods dealing with a serial of the IR images on the shooting range. It puts forward the new method of non-linear correction of IR images based on the linear calibration in real time serving background changing in course of tracing targets. The new method overcomes traditional abuse and obtains real-time coefficient of gain correction and correction factor. It eliminates non-uniformity background of a serial of the IR images. The experimental results using puny targets of a serial of the IR images on the shooting range shows that the new method not only wipes off the noise of the fixed-pattern and eliminates bad-cell of sensor, but also outputs a serial of the perfect IR images.关键词：IR images;linear calibration;non-linear correction;gain correction
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发布时间：2020-08-12 - 摘要：Lane Departure Warning System (LDWS) is a car safety assist systems, following the capsule of the safety, whose main task is to extract lane markings and make warning-decision. In this paper, the lane departure warning system hardware architecture is designed based on TMS320DM642 which acts as the central processing unit. The algorithms turn the image into grayscale, and then detect the image’s edge information, in the end set the region of interest (ROI) on the image. Hough transform based on phase grouping is used to extract the lanes, and according to the lane departure warning conditions, the system analyzes whether the warning should be presented or not and gives the driver warning singles when it is unconscious. The experiments results proved that the system will make warning in 2.5 s before the traffic accident, which implements the aim of the real-time, reliable lane departure warning.关键词：lane departure warning system;TMS320DM642;Hough transform;phase grouping
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发布时间：2020-08-12 - 摘要：When the images collected from camera have perspective distortion, it can affect the following work such as feature extraction and object recognition due to the influence of perspective projection. When rectifying these distorted images, perspective transformation can change the relative position of inner points, while affine transformation cannot. This article will improve the Hough transformation to find the lines that hold the four points which perspective transformation needs, and then use the perspective transformation to rectify the distortion based on the imaging principle of cameras. Emulation experiment results from Matlab reveal that the algorithm can effectively rectify the distorted images and achieve our expectation. This algorithm is easy, feasible and robust, and can be applied to many fields including object recognition.关键词：image process;image rectification;Hough transformation;perspective transformation
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发布时间：2020-08-12 - 摘要：It is known that step-down response of CCD’s part pixels, impact of high-energy particles and absorbed cosmic dust in space camera can all induce the black stripes for the camera image. For the camera in orbit for a long time, the image quality is seriously affected. By researching for the pre-launch calibration data, an algorithm based on the least square method and radiance retrieval was proposed to renormalize the image in orbit, which could make the black stripes in the image be effectively eliminated. Firstly, the gray levels of CCD pixels under different irradiation grades were collected, and the relation between the average gray level of all pixels and the corresponding irradiation values was established by the least square method, then the correction index of each pixel was worked out, and thus the correction index of the black stripes’ corresponding pixels could be obtained by analyzing the laboratory radiometric calibration coefficients. Lastly, the real gray levels of the black strips were computed by the correction index matrix. The experiment results show that for the modified images, the black stripes can be removed effectively and the image quality is satisfactory.关键词：space camera;black stripes;radiation calibration;least square;radiance retrieval
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发布时间：2020-08-12 - 摘要：In order to resolve the problem which is the large cost of time and material resources when the ground real-time compression storage unit needs connect to the CCD camera, and improve the efficiency of the testing the ground real-time compression storage system, the image simulator system is designed and uses FPGA to realize the timing and logic control. The data is communicated between the USB 2.0 bus interface and the PC, and downloaded to FLASH. Meanwhile the self-check figure created by FPGA also simulates CCD output. And in order to make sure the high-speed transmission between data and space camera real-time compression storage unit, the system uses synchronous serial LVDS interface and high-speed Gbps interface and Camera Link interface. The result proves that the speed of data download comes to 40 Mbyte/s from USB interface, and there’s no fault and lose when data transmitted between synchronous serial LVDS interface and high-speed Gbit/s interface. So the system is stable and reliable.关键词：image simulation resource;USB2.0;FLASH;SDRAM;self-check figure
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发布时间：2020-08-12 - 摘要：The correction algorithm is researched to solve non-uniformity of multiple channels output of area-scan CCD image. Various factors are analyzed contributing to the non-linear behavior of multiple output CCD. The method of multi-section linear approaching correction is proposed. The algorithm principle and its simple realization method are introduced in details. The correction algorithm is realized based on FPGA. Multi-section linear approaching correction algorithm has higher precision than two-point correction algorithm. It also has lower operation load than multi-point correction algorithm. This method satisfies the camera nonuniformity correction requirements, has very strong practicality.关键词：multi-output;linear response;non-linear response;multi-section linear approaching
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发布时间：2020-08-12
Imaging Technology & Image Processing
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