最新刊期
期 1 ， 2012
- 摘要：This paper reviews recent results on nanostructured alignment surfaces for liquid crystals. These surfaces are heterogeneous and yet can give uniform alignment of the liquid crystal and are able to give any pretilt angles in the range of 0~90° reliably and controllably. The conditions for having such uniform alignment properties are studied. Three techniques for the generation of such nanostructured surfaces are reviewed.关键词：alignment layer;liquid crystal alignment;nanotechnology;nanoimprint
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发布时间：2020-08-12
Invited Paper
- 摘要：The azo (—N=N—) linkage has the particular thermochemistry and actinoche-mistry behavior,the azobenzene group can undergo reversible cis-trans isomerization under light irradiation and its nonlinear optical properties possess the potential applications in the aspects of molecular design, photofixation, photochromics, thermochromism, etc. The UV-Vis absorbance of sixteen bent-core or linear monomers containing azobenzene as side arms and substituted para/m-aminobenzoic acid as central units was studied. The angle of the bent-core molecules was simulated. The trans-form of azo compounds showed a strong band in the UV region (330~370 nm) and a weak band at 440~450 nm. It was found that it has a close relationship between the angle of the molecules and the UV-Vis absorption.关键词：azo;angle of molecules;UV-Vis absorption
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发布时间：2020-08-12 - 摘要：The effects of curing electric field frequency on the electro-optic property of Polymer-Stabilized Cholesteric Texture (PSCT) is investigated. PSCT samples were prepared by means of polymerization induced phase separation (PIPS). By changing the curing electric field frequency, we can control the network morphology of PSCT and improve the electro-optic property. It was demonstrated that the diffusion of monomer and network morphology were related with curing electric field frequency. In addition, lower frequency promotes the diffusion of monomer and generally results in a open network with large void inside which often shows fast response, high closed transmittance, low threshold and low saturated voltage. On the adverse,higher frequency inhibits the diffusion and generally results in a closed network with smaller void inside which often shows slower response,lower transmittance,higher threshold and higher saturated voltage.关键词：polymer-stabilized cholesteric texture;electro-optic property;fast-response light shutter;curing electric field frequency
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发布时间：2020-08-12 - 摘要：Optical-grade polymethylmethacrylate(PMMA) was acted as matrix material in which spherical silica light diffusion agents A and B were blended respectively with different proportions. The effect of dosage, spherical particle size and size distribution of light diffusion agents on the transmittance, haze and mechanical properties was studied. The studies of spherical silica light diffusion agents in PMMA resin indicate that the light diffusion mate-rials could be prepared. Light diffusion agents can significantly improve the tensile strength while making little influence on the flexural strength and notched impact strength. When the concentration of light diffusion agents was 0.4%(mass fraction), with average particle diameter of 2 μm, the transmittance of light diffusion materials was 88.0%, the haze was 90.1% and the light diffusion coefficient was 79.3%, which has a good practical value.关键词：polymethylmethacrylate;light diffusion agents;transmittance;haze
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：For polarized stereoscopic projector,the influence of two main performance para-meters, which are the inconsistency in color and brightness of the left and right optical paths and stereo crosstalk, on stereoscopic projection quality is studied. The stereoscopic projection quality will be influenced by a number of factors, which are two projection images not strictly coincident on the screen, two optical paths' difference in color and brightness, stereo crosstalk caused by the polarized glasses, etc. The evaluation method is presented to evaluate the stereoscopic projection quality according to those factors and the evaluation system is built. The system obtains projection images by a digital camera, those parameters were analyzed and calculated by OpenCV, and then were compared with the presented maximum deviation value, the comparison result were sent to display and feedback signal. The system function is verified by using a stereoscopic projector. The result indicates that the evaluation system can measure and feedback performance parameters of stereoscopic projector effectively, and help to analyze the stereoscopic projection quality of the polarized stereoscopic projector comprehensively, thus enhance the stereoscopic projection quality.关键词：stereoscopic projection;inconsistency;stereo crosstalk;quality evaluation
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发布时间：2020-08-12 - 摘要：Transparent organic light emitting diodes are developed by using a multilayer oxide as a composite cathode. The device structure is ITO/ MoO3(10 nm)/NPB(60 nm)/Alq3(65 nm)/Al(1 nm)/MoO3(1 nm)/Al(X nm) /MoO3(30 nm). The composite cathode is MoO3/Al/MoO3 (MAM). A thin Al layer (1 nm) was introduced as an interlayer between the Alq3 electron transport layer and the MAM electrode. On the one hand, the thin Al layer improves the interface flatness between electrode and organic layers, while improving the conductivity of the electrode. On the other hand, electron injection was greatly improved by forming an Ohmic contact between the electron transport layer and a thin Al layer. Then the OLEDs optimum performance is obtained by changing the thickness of Al in MAM. With the Al thickness of 18 nm, the highest brightness 2 297cd/cm2 is obtained.关键词：OLEDs;Composite Cathode;transparent OLED;Ohmic contact
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发布时间：2020-08-12 - 摘要：The effects of Gamma value, color temperature and brightness parameters on the display colors were researched in this paper. The experimental results show that the appropriate gamma value can improve the image display quality; the effect of color temperature on display color is more than gamma, it can be chosen according to the specific work environment of the monitor; brightness has almost no effect on display color, it can be chosen according to the observing conditions.关键词：Gamma value;color temperature;adaptive dynamic gamma;brightness
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发布时间：2020-08-12 - 摘要：The basic theory and method of TRIZ is introduced, and the heat dissipation problem of LED back light units with conflict matrix is analyzed. As this problem belongs to physics contradiction, this paper puts forward an effective solution for LED back light units' heat dissipation based on conditional separation and scientific effect- phenomenon knowledge base. The result of theoretical analysis and simulation calculation shows that Peltire effect of semiconductor refrigeration has perfect heat dissipation on LED back light units.关键词：TRIZ;LED back light units;heat dissipation;semiconductor refrigeration
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发布时间：2020-08-12 - 摘要：In order to obtain the reliability life information of the white Organic Light-Emitting Diode (OLED) in a short time, failure data of OLED samples were collected by carrying out three groups of constant current stress accelerated life tests, and the lognormal distribution function was applied to describing the life distribution. The evolution of OLED's average life and the median life were achieved by applying the lognormal distribution to describing the life, and the self-developed life prediction software to plotting double coordinates' paper of lognormal probability, which based on map analysis method (MAM). Numerical results indicate that white OLED's life follows the lognormal distribution, that the acceleration model is consistent with inverse power law, and that the acceleration parameters which are accurately calculated make fast estimation of white OLED lifetime possible, which provides some significant guideline to its manufacturers and customers.关键词：white OLED;accelerated life test;lognormal distribution;MAM
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发布时间：2020-08-12 - 摘要：The level of TFT-LCD's image sticking is evaluated by introducing the weighted score. The period of pre-processing during liquid crystal cell assembly is divided into five parts from alignment film printing to sealant curing. The correlation between this five parts and image sticking is analyzed by Pearson Correlation Coefficient and trend chart, respectively. The analysis results showed the strong relationship between image sticking and the period of Q3 which is from rubbing cleaning to LC dispensing. After the detailed analysis of Q3, the conclusion is clear that the long keeping time after wet process is disadvantageous to decrease the level of image sticking. It has directed significance to real manufacture.关键词：image sticking;Q-time;wet process;impurities
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发布时间：2020-08-12
Device Physics & Device Technology
- 摘要：A USB2.0-based transmission system of micro-projection video signal is designed and implemented. In the system, frame images and the data of video on a media player are grabbed in real time, which are transmitted with USB interface and acquired with external FPGA logic circuit on the USB equipment. The design is verified on a FLCOS microprojection platform, and it shows that a transmission rate of 18.75 Mbyte/s is obtained, and video of 16-bit color, 640×480 resolution and 30 frame/s can be transmitted in real time with the system.关键词：microprojection;USB2.0;video transmission;FPGA
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发布时间：2020-08-12 - 摘要：Based on FPGA, the drive method of liquid crystal display is studied according to logic and time sequence of liquid crystal display standard.A general liquid crystal display controller is designed which can work under different resolution, the program of the general liquid crystal display controller is implemented with the Verilog language. The general controller can implement clear dynamic display at different resolution. Experimental results indicate that the hardware resource consumption of controller is much lower, it is good in genera lization and easy for portability, satisfying the system requirement. Without any modification the controller can be easily transplanted to other embedded systems as a display part to drive high-resolution LCD.关键词：liquid crystal display;FPGA;Verilog-HDL;LCD controller
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发布时间：2020-08-12 - 摘要：The mechanism of PDP scan driver IC's surge voltage is analyzed. Then, it gives the inhibition method of surge voltage with the PDP driving technology based on the mechanism of surge voltage.This method is realized by changing the code of the control plate in the system of laboratory. The feasibility of this method is verified with the waves of the new method and images are shown in PDP screen. The effective inhibition of scan driver IC's surge voltage can reduce the withstand voltage of chip. Thus, the cost of it can be decreased. Finally, the lower cost of PDP system would propel the development of PDP industry.关键词：PDP;scan driver IC;surge voltage;driving technology
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发布时间：2020-08-12 - 摘要：The characteristics of main display devices in the current market is analyzed. And this paper chooses the OLED display module, based on the general requirements of the S3C2440-based-system and the advantages and disadvantages of the display devices above. By analyzing the structure of S3C2440, this work uses SPI bus interface to solve the problem that the 8-bit parallel interface take too many I/O pins. Through the design of the hardware and software, the design meets the demand of the system saving interfaces, and achieving the OLED screen display module application on the condition.关键词：S3C2440;SPI;OLED display;embedded Linux
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发布时间：2020-08-12
Driving & Controlling
- 摘要：Because of the limitations of cost and size of the navigation photo-electricity equipments, it is necessary to get images or videos as clear as possible without changing the structure of navigation photo-electricity equipments. This paper introduces a method based on DSP image processing system to realize super-resolution reconstruction which realizes motion estimation by the united optimized algorithm of Fourier-Mellin and Keren firstly, and achieves super-resolution image reconstruction based on projection onto convex sets,lastly, realizes the method on DSP by optimizes the method based on the feature of DM642 without reducing the accuracy .This method improves the resolving power of the image system without increasing the size of the system structure as well as enhance the identify ability of the system. This paper has proposed to realize super-resolution reconstruction on the embedded image processing platform which the core is DM642, the resolution of camera is 720×576, and the reconstruction time decreases to 20 s from several minutes or even several ten minutes. Experiment results indicate that the detail of reconstruction image is clearer than that of the single frame interpolation image, and the average gradient and the information entropy also get improved.关键词：super-resolution;DSP;imaging processing system;Imaging Reconstruction
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发布时间：2020-08-12 - 摘要：The feature point is an important local feature in the image, and it is also the important information in the image comprehension and pattern recognition, so the feature point extraction technology becomes a powerful tool of image processing. A method that based on scale-interaction of Mexican-hat wavelets is presented, and the method could extract close number of feature points corresponding to the same location in the images distorted by rotation,brightness, blur and noise. For the problem that the feature points extracted by scale-interaction of Mexican-hat wavelets are corresponding to the different locations in images of different scales, the method that resizes the Mexican-hat wavelets by the scale factors is presented. Finally, the algorithm is proved by simulation experiments.关键词：feature point extraction;scale-interaction model;Mexican-hat wavelets;scale factors
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发布时间：2020-08-12
Imaging Technology & Image Processing
- 摘要：In order to segment each LED pixels from the image which is acquired by CCD and is used to brightness correction, a method based on optimal threshold segmentation with area constraint has been proposed. Based on optimal threshold method, taking prior information into account，an area constraint is introduced to restrain the range of threshold. Compared with traditional method, it is well done to avoid the LED region segmented connecting together. In the optimal threshold method with area constraint，generate the histogram of the captured image，use method of optimal threshold with area constraint to acquire the optimal threshold. Finally, apply the optimal threshold to segment the captured image. Experiments demonstrate that it is good to use this method to segment the LED pixels from the captured image, and also it can avoid the segmented region of LED pixels with a dense distribution connecting together, while using optimal threshold method.关键词：LED
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发布时间：2020-08-12 - 摘要：Horizontal Line Mura is one kind of defect during TFT-LCD manufacturing process. This defect will affect display quality seriously. After analyzed the profile of the metal layer and measured the stress status of metal film, the root cause can be revealed. It shows that during deposition process of metal film on glass substrate, the stress of Mo layer different a lot between the center area and glass edge. And this caused the loose of Mo layer, which affect the capacitor between gate and source electrode. Then cause display voltage on pixel shifted. To solve this issue, adjust Gate layer stack ratio by remove bottom Mo layer is effective to reduce the failure rate. And this can be demonstrated by experiment.关键词：Gate layer
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发布时间：2020-08-12 - 摘要：In order to meet the requirement of miniaturization and portability of the image storage system for camera based on Camera Link interface, the hardware circuit was designed with a Virtex4 family Field Programming Gate Array(FPGA) from Xilinx company and a 6000 series Digital Signal Processor(DSP) from TI company. First, under the control of FPGA, Image data from Camera Link were cached in a SDRAM; at the same time, the image data which read from the other SDRAM were stored in double solid-state hard disks by ping-pang operation. Then the host computer connected with DSP through Fast Ethernet, under the control of the host computer, DSP acquired image data through External Memory Interface (EMIF) and sent it to host computer to realize real-time display or image playback function. The system that based on the scheme stored image successfully, past by the experiment in 640×480,100f/s,10bit monochrome. When the real-time display function is not needed, the designed system could accomplish image storage independently to complete the storage task to meet the Base Camera Link type Camera portable storage requirements.关键词：DSP
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发布时间：2020-08-12 - 摘要：Improve on the matrix filling rule of the integer DCT transform radix, and get a new type of integer transform radix, called variety integer DCT transform radix. Filter the numerous of variety integer DCT transform radix, get some optimum radix, and apply to MPEG4 coding and decoding experiment, the analysis results of test data show that the normalized matrix of variety integer DCT transform radix have similar de-correlation characteristic with the original DCT matrix, and can replace functions of the integer DCT transform radix in image and video coding . because variety integer DCT transform can be implemented by rapid butterfly algorithm completely, and can be implemented by hardware easily, applying to image and video coding, can reduce the complexity of coder and decoder greatly.关键词：implemented by hardware
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发布时间：2020-08-12 - 摘要：Aiming at solving the situation that the original SIFT algorithm can only get few number of matching points if there are a few regions similar to the matching image on the reference image, which will affect the estimation of parameters in the transformation model. Proposed algorithm first apply edge detection and morphology filtering in the image preprocessing stage to extract edge-abundant areas, then adopt an improved simplified SIFT, and combine the rough matching area detected by SSDA and robust matching points while matching points, thus improving the discrepancy of similar points in the algorithm. Compared to the original algorithm, our proposed algorithm can get more correct matching points and is less time consuming.关键词：feature matching
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发布时间：2020-08-12 - 摘要：In order to achieve the touch screen as the man-machine interface equipment, using SOPC technology, Nios II processor system in FGPA was builted as a touch screen controlle.Screen display and touch screen capabilities have been realized by writing Nios II control procedures. The designed planning structure of Display Area has became a relatively common method to the information display and touch functions of the system. It can increase code reusability and versatility, simplifies the program design process of display interface,and the system performance and development efficiency was improved.关键词：Planning of Display Area
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发布时间：2020-08-12 - 摘要：High-performance bottom-contact pentacene OTFTs with graphene source/drain electrodes by transferring and patterning CVD-grown layered graphene flms in a room-temperature process has been developed. The AFM images show that the growth of pentacene grains was not affected by the electrode, because patterned layered graphene electrodes were signi?cantly thinner compared to common metal electrodes. The output and transfer curve, on/off current ratio, threshold voltage and field-effect mobility of the device were obtained by electric measurements. The transfer curve showed an off-current level of ≈10-9 A and an on/off current ratio exceeding 103. The bottom-contact pentacene OTFTs based on graphene source/drain electrodes had a maximum field-effect mobility of up to 2×10-2 cm2 V-1 s-1 ).关键词：Electrical properties
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发布时间：2020-08-12
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