最新刊期
期 6 ， 2013
- 摘要：Tb3+ doped ZnO-3SiO2 luminescent materials was prepared by the Sol-Gel method. The crystal structure and the luminescent properties of the samples are measured and characterized by using the method of DTA-TG, IR, XRD, SEM and excitation and emission spectra, respectively. The DTA-TG analysis shows that the weight loss is obvious in the tempe-rature range of 20~400℃, and this phenomenon corresponds to the loss of dissociated water and ethanol. The IR spectra show that the change between the bridge oxygen bonds and the non bridge oxygen bonds during the sample preparation has a large influence on the luminous efficiency. Powder XRD analysis indicates that the samples belong to the non-crystal materials. SEM of samples show that it forms grain structure of tetrahedron and polyhedron. The excitation and emission spectra show that the best annealing temperature is 600℃ for preparing material and the optimum doping amount of Tb3+ is 2.75%(at%).It also shows that the best excitation light is the ultraviolet light with the wavelength of 377 nm when the wavelength of the monitoring light is 544 nm, that is to say, the monochromaticity and the luminescent intensity of green lights excited from the samples are optimum when the wavelength of the excitation light is 377 nm.关键词：sol-gel method;Tb3+：ZnO-3SiO2;luminescent materials
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发布时间：2020-08-12 - 摘要：In order to improve the optical and electrical properties of poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate)(PEDOT:PSS)film,the PEDOT:PSS doped with Gly-cerin,Sorbital and Dimethyl Sulfoxide transparent conducting thin films were fabricated on glass substrates by blending-spin coating method.The microstruct ure and properties of these films were studied by X-ray diffraction,scanning electron microscope,atomic force microscopy ,UV spectrophotometer and four-point probe method. Experimental results show that the amorphous state of PEDOT:PSS films doped with different agent does not change,but the surface morphology of thin films appear significantly different.The conductivity and light transmittance of the doped-films is greatly enhanced, and the conductivity increases as the annealing temperature rise.Under the same doping concentration, the PEDOT:PSS thin films doped with Sorbital reach the best conductivity and light transmittance.关键词：PEDOT:PSS;doped;thin films;microstructure;property
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发布时间：2020-08-12 - 摘要：The reactive PUA was used as the matrices to prepare PDLC films with various liquid crystal contents and different concentrations of initiator by UV polymerization induced phase separation. The influence of concentrations of initiator and liquid crystal contents on the morphology and electro-optical property of PDLC films was studied through modified ultraviolet spectroscopy and digital microscope. It indicated that with the increase of the liquid crystal contents, the diameter of the liquid crystal droplets increased and the electro-optical property of PDLC films get better obviously and with the increase of the concentrations of initiator, the size of the liquid crystal droplets became smaller and Ton increased.关键词：polymer dispersed liquid crystals;liquid crystal contents;concentrations of initiator;electro-optical property;morphology
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发布时间：2020-08-12 - 摘要：The molecular reorientation transient process induced by laser pulse in nematic liquid crystals (NLC) with bias voltage is explored. The results show that if the width of pulse is large more than 1 ps, the molecular reorientation transient process induced by the pulse can be modeled as Debye relaxation process, the relaxation time constant is inversely proportional to the elasticity constant of NLC, and is proportional to the square of thick of the cell. On one hand, the relaxation time constant is transversely dependent, for the pretilted angle varied in 0~0.4 rad, the relaxation time constant can be varied in one order of magnitude, for the case of pretilted angle is more than 0.4 rad, the time constant remains the same. On the other hand, the relaxation time constant can be steered by bias voltage, reorientation relaxation time ranges from 10 ms~10 s can be obtained if the 1.2~10 V bias voltage is applied to the cell.关键词：homogeneous alignment;reorientation relaxation time;bias voltage
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发布时间：2020-08-12 - 摘要：The main techniques to realize black and white display for STN mode at present are introduced. With the rapid development of ASTN in recent years, the dispersion is proposed as an important parameter which decided the TEP compensation film of ASTV system can be matched or not. In this paper, the retardation were tested and the optical anisotropy were fitted in different wavelength to calculate the dispersion after different structure compounds were added in the same LC Host and then filled into the LC cells. The retardations of the mixtures of compound and LC Host under different temperature were tested also, and then the changing trends of different structure compounds dispersion were compared. The basic research on dispersion in this paper made great significant in selecting compound monomer of a ASTN system.关键词：ASTN;TEP film;retardation;dispersion
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发布时间：2020-08-12 - 摘要：Four fluorinated diphenyl acetylene negative liquid crystal compounds containing dicyclohexyl were designed and synthesized. Target liquid crystal compounds were measured by polarised optical microscopy and differential scanning calorimetry and their good mesomorphic properties were obtained. The target compounds obtained high birfringence, low rotational viscosity and high clearing point about 270℃. The nematic liquid crystals could satisfy the requirements of a high temperature component in TFT-LCD,it also could be used in adaptive system like as application in construction of spatial light modulator. Four target compounds were synthesized by sonogashira coupling reaction.关键词：fluorinated liquid crystals;diphenyl acetylene;dicyclohexyl;negative liquid crystals
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发布时间：2020-08-12 - 摘要：The deposition conditions were optimized for low speed deposition gate insulating layer (GL) and low speed deposition active layer(AL), and four experimental conditions were established. The second condition was confirmed to be the optimization condition by analyzing the uniformity of the thickness, the overall distribution patterns and uniformity of Ion. The improvements of Ion and threshold voltage were investigated. To further investigate the stability of electrical characteristics, the TFT transfer curves under gate stress and the C-V curves under high-frequency signal were analyzed before and after optimization. It was found that the stability of optimized electrical characteristics for TFT was better. Ion was improved by 42% and the switching ratio (Ion/Ioff) was improved by 70%.关键词：gate insulating layer;active layer;deposition conditions optimization;electrical characteristics;improvement
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：Integral imaging is a display technology which captures and displays three-dimensional (3D) information using microlens array, stray light from the intervals between the elemental lens and crosstalk between the elemental images might affect the quality of the reconstructed image. This paper presents a combined pinholes/microlens array, in which the pinholes array was used to reduce the stray light. The parameters were designed and analyzed according to the principle of integral imaging, and the 3D display process was simulated using Tracepro. The results show that the presence of pinholes array reduces remarkably the lilght spots irrelevanted to the imaging during both the pickup and reconstruction of images. Especially, when the pickup lens and reconstructed lens were both pinholes/microlens array, the reconstructed image with the highest quality was obtained.关键词：optical design;integral imaging 3D display;pinholes array;microlens array
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发布时间：2020-08-12 - 摘要：To resolve a kind of node Mura of 116.8 cm(46 in) Fringe Field Switching panel in array actual 4mask etching process,scanning electron microscopy,focused ion beam,energy dispersive spectroscopy Macro/Micro and critical dimension are used to verify the compositions and crystals. Also GI test,PVX layer's front and backside in 1% HF corrosion experiment, elevating 10℃ in lower electrode,varying ash and AT(after treatment)of n+ step and active BT conditions are carried out. In addition, the effect of the n+ doped a-Si thickness is studied. So the Mura sources, influencing factors and the Mura mechanism are revealed:First factor is its first formation on the substrate back scratch,the other is the film changes between contact and non-contact electrode layer etching regional in temperature changes, the third is by-products adhesion to the substrate backside in active layer dry etch, followed by a multi-layer film deposition and amplified after wet etch-strip process. Finally the flat and rough lower electrode is adopted,remaining a-Si thickness is restricted between 210 nm and 230 nm, and temperature is elevated to 50℃,then node Mura has not been found and the overall Mura ratio is less than 0.08%.关键词：Mura;thin film transistor;amorphous silicon;defect analysis
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发布时间：2020-08-12 - 摘要：Neutral gray balance is one of the most important metrics to evaluate the quality of image on image devices. The concept and model of visual gray balance are proposed in this paper. This paper uses the look-up-table to get the visual gray balance data, which are used to fit visual gray balance curves, and load the visual gray balance curves into the images displayed on the LCD displays. The results of subjective experiments show Z scores is greater than those of original images with 95% confidence interval, which are calculated by evaluating the corrected images.Then, considering the visual gray color, the color chart is redesigned and the ICC of LCD displays is remade. The result shows that compared with the color gamut which are produced by the default color chart,the new one appears to be large. LCD displays will reproduce more color by loading the new ICC.关键词：visual gray balance;LCD displays;color correction;display quality
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发布时间：2020-08-12 - 摘要：The polarizer, one of the important parts of a liquid crystal display, impacts the quality of display directly. This paper introduced the basic composition of polarizer, and the formation mechanism of a defect related polarizer was analyzed according to the relationship of moisture and transmittance of polarizer. It showed the formation of the defect is related to the humidity and polarizer material. Then it conducted a test with different modules whose polarizers were made of different materials, in variation temperature and humidity. The results verified the formation mechanism, at the same time established the solution for this defect, that was in active area of display, local polarizer should avoid to contact with other components, or to choose the polarizer that has small change in phase difference.关键词：TFT-LCD;polarizer;humidity;Mura
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发布时间：2020-08-12
Device Physics & Device Technology
- 摘要：Faced with the drawback of widely-used SDRAM controller in TFT-LCD driver, a arbiter for SDRAM controller is designed in FPGA device. The arbiter has the right to distribute the use of data and address buses. In this way, the ideal function is realized that the image data can be updated by means of the external device while the LCD is still at work. In the paper, the design method of the arbiter is introduced. Various parameters of the arbiter are worked out after considering the depth of FIFO, the burst length of SDRAM, the operating frequencies of different components and so on. Therefore, the loss or errors in data can be avoided when the SDRAM controller is under the control of the arbiter.关键词：TFT-LCD driver;SDRAM controller;arbiter
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发布时间：2020-08-12 - 摘要：Based on B/S architecture, a full range of motion image detection and alarm systems is designed. Linux system is translated into ARM11 platform as the operating system platform. Via USB camera capture front-end image, the collected image were sent to moving target detection module. Using image sequence frame difference method to detect whether a moving object exists, in order to prevent the emergence of false alarms.The background reference frame were update timely. Then the image data were compressed by H.264 compression module, and the compressed image data is transmitted to the client for decoding display; and client end uses CGI dynamic web technology to control monitor behavior. Experimental results show that the monitoring system can accurately detect the moving target, and the image is clear, smooth PTZ control, which can fully meet the user's daily requirements, and can be widely used in transport, schools, banks, supermarkets, buildings and some important events.关键词：ARM11;Linux;B/S architecture;CGI technology;image sequence frame defe-rence method;H.264;cloud terrace
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发布时间：2020-08-12 - 摘要：A complex application system of liquid crystal display based on single chip computer control is designed which can display current temperature value and can draw the real temperature curve on LCD. The system hardware is constituted by single chip computer AT89C51, parallel A/D converter AD1674, I/O extended port 8255, character liquid crystal displayer LM016L and graphical liquid crystal displayer AMPIRE128×64. The system circuit schematic diagram and program are designed in software Proteus and Keil respectively. Meanwhile, the system hardware is interactively simulated with system software in Proteus. Finally, the system function and every technical index are performed through actual circuit welding and debugging.关键词：liquid crystal display;single chip computer;temperature;analog to digital converter;Proteus
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发布时间：2020-08-12 - 摘要：Aerial remote sensing camera image capture has a huge data flow per second for image transmission. The image frames lost in the process of storing to hard disk. To solve this problem, an image data high-speed storage technology by hard disk and implementation method are introduced based on the miniaturization dual-band aerial remote sensing camera. The problem resulting in the frame losing is analyzed theoretically from multi-angle. The analysis is proved accurate by the experimental data.The bottle-neck is pointed out clearly during the image transmission. Finally, based on theoretical analysis and experimental data, the concrete solutions are proposed in both hardware and software: use RAID technology and allocate large cache in hardware, use WINDOWS multiple-thread programming combined HOOK technology in software. With the combination of these methods, the problem of the frame losing is solved successfully. Image data is stored without losing frames from 8 frame/s increase to 24 frame/s.The work efficiency of the hard disk is improved from 51.6% to 78.3%.关键词：dual-band;visible;infrared;aerial remote;hard disk array;high speed memory;multiple thread
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发布时间：2020-08-12 - 摘要：In the rotating LED display system, in order to display the information of picture in real-time and update fast, the paper takes the STM32 as the main control CPU, using the Holzer sensor and encoder, the accurate position of LED display information is realized. The picture information can be input and updated through rotating LED software control platform. The displayed information can also be updated and transmitted to the rotating LED display system accurately and reliably. Through the actual production test,the design achieved good results.关键词：rotating LED;display screen;radio frequency
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发布时间：2020-08-12 - 摘要：With the development of technology, the image sensor can easily obtained High Dynamic Range (HDR) image just as the large dynamic range of luminance values in a scene of real life, while the display range of conventional display device is only 100:1. The systems of HDR display based on the dual structure of the projector or LED array has many shortcomings, such as huge volume and low local contrast. So this paper presents a backlight of liquid crystal display using field emission backlight. HDR images have been displayed by using image segmentation algorithm. The point-by-point control mechanism of front and back panel, which divides the high dynamic image in the systems of two panels is proposed. The experiment result demonstrates that the field emission backlight structure can increase the LCD local contrast to 65 025:1. And it has higher practical value for displayer.关键词：high dynamic range;contrast ratio;image gray division;field emission backlight unit
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发布时间：2020-08-12 - 摘要：On the platform of DM6467T, a video system was designed which integrates the function of video encode and store as well as network transportation. The feature of Davinci platform,hardware structure of the system and the process of creating Davinci developmental environment were introduced. Using the h.264 encode algorithm in the codec engine, the App multi-threads application program was designed. This work presented the flow of threads and the interaction between the threads, which include main thread, video thread, capture and display thread, network transportation thread, writer thread. The integration of hardware and software were completed. The test results indicate that the image of video loop back is clear and fluent, with good real-time property. The display of network-transported video can meet the demand of real-time video monitoring. The stored video data is clear and complete and the compression rate is higher than 100.关键词：DM6467T;video;encode;store;transportation
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发布时间：2020-08-12 - 摘要：In order to realize the sampling data display, a display platform consisting of STM32F103VET6 and 11 cm(4.3 in) TFT LCD module is established. For the problem of intersections between dynamic waveform and coordinate grid filled with background color, this paper propose a method of intersection identification, intersection filled with the grid color, non-intersection filled with the background color. By the practical application in the cable parameters acquisition and control system, it shows that the method can solves the problem of the grid being filled, but also avoid the flicker waveform, it has good usability, meets the requirement of real-time waveform display.关键词：STM32F103VET6;dynamic waveform;intersection identification
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发布时间：2020-08-12
Driving & Controlling
- 摘要：In order to effectively compressive MODIS(Moderate Resolution Imaging Spectral Radiometer) emissive IR bands multispectral image, a lossless compression method based on prediction and JPEG2000 was proposed in this paper. Firstly, the Pearson correlation between spectrums in MODIS data was calculated, and then a graph was built according to the coefficient acquired. Whether the current band was compressed directly or not was determined by the threshold setting according to the correlation coefficient. The threshold and requirements to the starting band was used to modify the graph. The MST was established with Prim algorithm, and all bands were predicted with first-order linear predictor and the tree. The residual errors of predicted bands and those compressed directly were all encoded by JPEG2000. Experiments were performed for the MODIS emissive IR bands multispectral image. The experimental results shows that the compression ratio of the proposed algorithm can be significantly improved compared with algorithms with linear sequence.关键词：MODIS data;MST;first-order linear predictor;JPEG2000;lossless compression
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发布时间：2020-08-12 - 摘要：In order to improve the transmission performances of the high speed image transmission data in TDICCD imaging system, it designed the new structure with dynamic RAMs for designing 5/3 lifting wavelets in FPGA. It solved the problem that the RAMs in FPGA were not adequate in some applications by using the same RAM in loops and reading-or-writing, which improved the ability of the RAM used efficiency. The simulation results also indicated that the new structure was better at the aspects of high speed, high reliability, low resource used ratio. The structure could be used in image pre-compress, image de-noise, image transmission and other areas. The new structure of the 5/3 lifting wavelets implementation in FPGA, within 5 lines image storage finishing the processing, enhanced the processing ability of the image data in aero-space camera. It created a new way of data real-time process in space.关键词：dynamic RAM;5/3 lifting wavelet;FPGA;TDICCD
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发布时间：2020-08-12 - 摘要：In order to get eternal, continuous and active continuous flow video, analyzing several video synthesis technologies, this paper presents a new particle system based on continuous flow video synthesis method which could process sample videos of continuous flow, and synthesize more realistic seamless video of arbitrary length than other algorithms. Based on the particles movement rules in the video sample, the input sequence is represented by particle texture matrix. The particle texture matrix is modified, and new sequence is synthesized. A new particle texture matrix is edited to new region and more realistic and active flow video is synthesized. The continuous flow video synthesis editor software is developed by this way, and is applied to video sample. The experimental results show that this synthesis method has the characteristics such as the higher speed calculation, better synthetic effect than before, and it is easy to implement.关键词：particle system;continuous flow;sample video;particle textures;video synthesis
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发布时间：2020-08-12 - 摘要：In order to solve the undetected and error detected problem in Harris corner detection method, an improved Harris corner detection method based on edge is put forward. The improved method firstly extracts edge of input image with second order differential operator and then detects the corners in the edge image with Harris corner detection method. Finally the positions of the detected corners are recorded and marked in the original image. Experimental results show that the improved corner detection method which extracts edge with second order differential operator is able to detect more corners more accurately than that with gradient.关键词：corner detection;Harris operator;gradient;Laplacian operator
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发布时间：2020-08-12 - 摘要：In accordance with the focusing mechanism of a space camera, a focusing mechanism precision detection system was designed. It expounded the system designing method from the hardware and the software, introduced the key state judging method emphatically, which was used to set the motor's step counts, and described the motor drive signal generation process in detail. And from the reliability, a system state monitoring circuit was introduced. The experiments showed that the accuracy detection system of the focusing mechanism worked stably, and it could be used for the focusing mechanism precision detection. Furthermore, after being modified, the system can be used for precision detection of other cameras.关键词：focusing mechanism;accuracy detection;step motor;key station judgement
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发布时间：2020-08-12 - 摘要：When aerial camera is used for particular scene (such as lighter or darker background, or there is a strong interference point), the traditional dimming algorithm will not be able to achieve the correct exposure.For this phenomenon, a method based on scene distinguish is proposed. First the target area is extracted according to the scene classification, then the information of the target area is returned in order to control the exposure time of the camera. According to this method, the quality of the image is improved. For example, the gray value of the target area decreased from 254.65 to 124.39 in a darker background, and the information entropy is increased by 6.839; the gray value of the target area increased from 92.098 to 106.99 in a lighter background, and the information entropy is increased by 0.188.关键词：aerial camera;automatically dimming;scene distinguish;target area extracting
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发布时间：2020-08-12 - 摘要：Using MT9M413C36STM and TMS320VC33PGE,a high frame frequency CMOS image sensor imaging, display and processing system is developed. According to the characteristics of used component, this text analyzes the imaging, display and data processing principle and timing. Hardware circuit system is given,and the key of design is introduced. Under the development environment of the QuartusⅡ8.0 and CC4.1,the driving program is compiled and debugged with VHDL, AHDL, C language. Experimental results show that this system can stably work in the 1 280×1 024@60 Hz line-by-line scan mode, and has already been used in an important item.关键词：drive procedure;image sensor;CMOS;MT9M413C36STM;TMS320VC33PGE
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发布时间：2020-08-12 - 摘要：In the range, in order to get the image of wide field of view and high resolution, the real-time image-mosaic system based on DSP was designed. The system obtain image of two field of view sensor, and then mosaic within the DSP. At last, the standard numeric format was exported for other systems. The hardware principle of image mosaic-system was given. As the frame rate of the two sensors was 100 Hz, the traditional image mosaic algorithm cannot satisfy the real-time requirement. So the phase correlation algorithm was used to determine the similar area to reduce time for mosaic image. The experiment was taken. The result showed that the time for real-time image mosaic was average 7 ms, which meets the real-time requirements. The system is stable and reliable,which meets the practical requirements of range measurement.关键词：image mosaic;DSP;phase correlation algorithm;Harris
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发布时间：2020-08-12 - 摘要：As a kind of the most intuitive information, image has brought great convenience to our daily life. However, due to haze and poor light environment impacts, actual image usually have blurred clarity and other issues. Currently, image defog and enhance processing is mostly in hindsight, it is difficult to meet the requirements for tracking and other high real-time requirements applications. To solve this problem,a real-time image defogging and enhancement system is designed based on DSP+FPGA. This paper collects the DSP's large-scale data processing capability and FPGA's high real-time advantage, and skillfully transplant the improved "Dark channel" principle algorithm. This real-time image defogging and enhancement systems has applied in practical projects, and effectively meets the requirements of real-time processing. Experimental results show that this system works stably and effectively, solves the problem caused by haze and insufficient light perfectly.关键词：image defogging;image enhanced;DSP;FPGA;image processing
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发布时间：2020-08-12
Imaging Technology & Image Processing
- 摘要：The printed electronic paper (e-paper) and its current situation were introduced. The technology trend of printed e-paper was studied deeply based on the patent. Four aspects including general trend, focal points of the technology, the important institutions and new terms and researchers were examined. The research results may provide reference to make strategic decisions for relevant enterprises. The study found printed e-paper is in the stage of rapid development, Japan keeps the leading position. The countries around the world layout actively in order to occupy the upper hand.关键词：E-paper;printed;patent;trend
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发布时间：2020-08-12
Industry and Test Technology
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