最新刊期
期 2 ， 2014
- 摘要：Three-dimensional (3D) displays realize the dream of human beings—displaying the real world as natural and realistic as possible. Integral imaging, which is based on the principle of optical path reversibility, is becoming one of the research hotspots in 3D displays. To fully understand the 3D pickup and display processes of integral imaging, this paper describes the basic principle of integral imaging, and overviews several typical 3D pickup methods, such as the full optical pickup method, the direct pickup method, the scanning pickup method, and et al. And then, integral imaging 3D display methods based on the viewing point and the depth plane are introduced.关键词：integral imaging;three-dimensional pickup;three-dimensional display
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发布时间：2020-08-12 - 摘要：Active matrix liquid crystal display (AM-LCD) has strict requirements on the liquid crystal properties, which greatly promoted the development of fluorinated liquid crystals. This paper reviews the progress in synthesis and application of fluorine containing liquid crystal materials in recent years, and focuses on the effects of different location of fluorine atom on the performance of the parent molecule in liquid crystal compound and the corresponding synthesis method. In combination with the liquid crystal phase transition temperature, dielectric anisotropy, birefringence and viscosity data, the key position of fluorine substituted in liquid crystal molecules were illustrated.It can significantly improve the performance of liquid crystal. The paper introduced the synthetic methods about terminal group fluorinated liquid crystals, benzene laterally fluorinated liquid crystals and the central bridge bond fluorinated liquid crystals.关键词：fluorinated liquid crystal;property;synthesis
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发布时间：2020-08-12 - 摘要：2,7-Didodecyn-1-yl[1]benzothieno[3,2-b][1]benzothiophene (C10-BTBT) was synthesized in the base of o-chlorobenzaldehyde, NaSH·xH2O and decanoyl chloride by elimination reaction,acrylation reaction and reduction reaction.The structure of compound was confirmed by 1HNMR. The properties of optical, electrical and environmental stability were studied. Its optical properties were characterized by the UV absorption and fluorescence spectra.The results indicated that maximum emission peak of the compound is at 352 nm which is the typical blue fluorescene.The phase transition temperature was measured by DSC,the transition temperature Tcp=112 ℃,Tmp=125 ℃.The OTFT devices with bottom-gate and top-contact structure based on C10-BTBT were preparated by inkjet printing method, the average field-effect mobility was up to 0.1 cm2/V·s and the maximum mobility was 0.25 cm2/V·s, the on/off curruent ratio exceeded 104. Organic thin-film transistor was placed in air different time,The on/off current,on/off ratio of organic thin-film transistor had no more changes.关键词：organic thin-film transistor;benzothiophene;mobility;air-stable
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发布时间：2020-08-12 - 摘要：STN-LCD has an important position in portable display market for its low price and simple manufacturing process. The display quality strongly related to LC material components, especially the characteristic of chiral dopants.In this paper, different twist ability chiral dopants were added in the same LC Host, and its influence on response time, temperature coefficient and view angle were stu-died. The quantities of chiral dopants were calculated from d/p≈φ/360, all the mixtures were the same threshold voltage, then the DV/DT value and the change ratio of response time were measured.We conclude how to choose and evaluate the performance of chiral dopants in massive production.关键词：STN-LCD;chiral dopant;chiral power;response time
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发布时间：2020-08-12 - 摘要：A new series of fluorinated liquid crystal compounds with vinyl linking group was designed and synthesized via 3 steps reaction with a purity higher than 99.5% and overall yield of 44.1%~48.3% by using 4-bromobenzyl bromide as starting materials. Their structures were identified by IR, 1HNMR and MS and their phase transition temperatures were tested by DSC and polarized optical microscope. It is found that all of the new compounds show only nematic phase, and both the melting points and clearing points increased compared with that of similar compounds without vinyl linking group due to an elongated molecular conjugation. The measurement of physical properties indicate that the compounds have higher clearing point, lager Δε and Δn,and fast response time which is suitable for liquid crystal display.关键词：fluorinated liquid crystal;vinyl linking group;synthesis;mesophase;property
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发布时间：2020-08-12 - 摘要：High HTP values chiral additives in LCD was synthesized based on 4-cyclopentylcyclohexa-none and chiral of 1,1'-Binaphthyl-2,2'-diol by reduction reaction, substitution reaction, and a series of reactions. It has large HTP values, good light stability and chemical stability. In addition, it also has other requirements of TFT-LCD chiral additive, such as higher voltage holding ratio, good compatibility with the main liquid crystal material, uneasiness to be absorbed by adsorbent (silica gel or alumina), limited temperature dependence of the pitch, etc. Especially its HTP value reaches 101 μm-1.When compared with other chiral agents, less dosage will be needed in making LCD devices, which can greatly reduce the negative influences of the additives on the quality of mixed crystal. The synthesis method is simple, the purifications of the intermediates and the final product are easy. These advantages make it possible for the high HTP chiral additives to be applied in the high-end TFT mixed crystals.
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发布时间：2020-08-12 - 摘要：Aimed at the limitation of the navigation of the embedded handheld devices, the display terminal of Beidou navigation based on the STM32+ucGUI is put forward.Using the Beidou navigation receiver module-UM220, the navigation information is obtained. The procession of information is completed by the interrupt handling of the STM32. In order to realize the human machine interface friendly, the ucGUI is transplanted on the platform. The electronic compass is completed efficiently by the auto device object of the ucGUI.The experiment result shows that the navigation time of cold boot is less than 2 min while that of hot boot is less than 1 min.Either the longitude or the latitude is affected by the speed and the deviation is less than 3 m.It can satisfy the system requirements of non-contact, online, real time, higher precision and rapid speed, as well as strong anti-jamming and stabilization.关键词：Beidou navigation;STM32;ucGUI computer vision
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发布时间：2020-08-12 - 摘要：A LCoS head-mounted display system with terrestrial TV receive function based on silicon tuner XC3028 and video processor SAA7111 is designed in the paper. The system consists of terrestrial TV receiving circuit, video processing circuits, audio processing circuits and LCoS display. It can work properly with or without external video source. The overall design scheme of system is introduced in the first place. Then the functions and design schemes of various parts are presented from a hardware perspective. Finally, a modular design method is adopted to complete system software design. Experimental result shows that this system has features of rational design, stable operation and clear display effect. The circuit dimension is only 46 mm×54 mm and the power dissipation is 1.9 W. The system meets the requirements of compact size, low power dissipation, simple structure and has a promising market prospect in the field of mobile video terminals.关键词：XC3028;SAA7111;LCoS;portable TV;display system
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发布时间：2020-08-12 - 摘要：In order to improve the image stick caused by gas discharge of sustain period in PDP, the influences of gas discharge on the image stick phenomenon and the tricolor brightness difference under same discharge conditions were studied. The relationship between gas discharge and image stick was analyzed. The new method was proposed in which the gas discharge intensity was adjusted, the luminance difference caused by gas discharge was compensated, and the image stick was improved. The experimental results show that the image stick recovery time is shortened and the image quality of PDP is improved significantly even in the long time display of static image.关键词：PDP;motion detect;image stick
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发布时间：2020-08-12 - 摘要：In order to improve the process and defect in ODF, the relationship between diffusion time and distance of liquid crystal in TFT-LCD (after vacuum alignment) is researched in this paper. A liquid crystal diffusion model of tilted state has been proposed by the assumption of newton fluid. Mathematical derivations prove that the flat state diffusion equation is a special case of tilted angle 0. The gravity effect becomes more significant by longer diffusion distance in titled state. That is why the diffusion time has difference between the two states. Panel size and LC pattern design have an effect on the final pattern of liquid crystal diffusion. Cell gap and photo spacer will affect the diffusion velocity. The effect can be reduced by more uniform gap and smaller density of spacer. Experimental studies show that the theoretical data calculated by the model is close to the experiment data. The model can make a good flow prediction for the diffusion of liquid crystal in TFT-LCD.关键词：diffusion of liquid crystal;ODF process;Newton fluid;N-S equation
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发布时间：2020-08-12 - 摘要：The influence of annealing time on charge transport properties of solution-processed Tips-Pentacene was investigated by the measured J-V property of p+Si/PEDOT:PSS/Tips-PEN/Ag.The results show that with the increasing bias voltage, the J-V curves of the devices annealed for 2 and 5 h in double-logarithmic scale exist different regions, where slopes are 2, larger than 3 and 2 successively, but the curve of the device annealed for more than 10 h doesn't have initial region with the slope equal to 2.Using Space Charge Limited Current model, charge transport mechanisms in different regions were analyzed,and the hole trap densities and mobilities were extracted. Annealed for more than 10 h,material has the lowest trap density of 5.70×1018/cm3 and the maximum hole mobility of 1.68×10-4cm2/(V·s). Meanwhile, the transport mechanism of the material annealed for more than 10 h changing shows that the single trap density, relevant to solvent residues, deduces considerably.关键词：Tips-Pentacene;space charge limited current;annealing time;solvent residues
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发布时间：2020-08-12 - 摘要：Due to having such excellent characteristics, self-illumination, without backlighting, high contrast, thin thickness, wide viewing angle,fast response, organic light-emitting diode (OLED) can be used for flexural property panel. At the same time, OLED is considered as emerging application technology of the next generation of flat panel display because of wide temperature range and relatively simple structure and process. At present, the OLED driver is mostly based on STM series of ARM chips and traditional FPGA chip. In order to meet the human-computer interaction requirement of "Zynq", the latest platform developed by Xilinx, and a kind of method about OLED driver design based on the Zynq is put forward. In this paper, the characteristics of OLED and SPI control mode are introduced, and the design process and the hardware circuit diagram are given. The OLED driver's IP core is completed at the aid of the Zynq's PL part, and the OLED driver design is implemented at the aid of the Zynq's PS part. The communication between PL and PS is realized by AIX bus. Finally, the real-time display of letters, numbers and bitmap image are realized by the test program. It resolved engineering technology of human-computer interaction based on Zynq device in radio and television equipment and electrical instrument, with high integration, strong portability and versatility, etc.关键词：Zynq;OLED;SPI;drive
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发布时间：2020-08-12 - 摘要：Electrical energy is a widely used secondary energy. The quality of electric energy directly influences the normal operation of electrical equipment. Therefore, it has practical significance to achieve energy parameters of the dynamic display for real-time monitoring of power quality. In this paper, hardware display circuit is constructed by DSP(F2812) and SMG12864 LCD. Data are sent into the DSP through the acquisition module, then displayed on the LCD after processed by DSP. This design consists of DSP and LCD interface circuit and the liquid crystal driver software programs. Experiments show that the liquid crystal display module based on the DSP(F2812) can display real-time power quality parameters, achieving the anticipated design effect.关键词：DSP;SMG12864;real-time;liquid-crystal display
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发布时间：2020-08-12 - 摘要：In order to realize the function of stereo display on dual AM-OLED micro displays by playing the video source from computer, stereo display interface circuit is designed. The binocular parallax principle of the human eye and the stereo display function of SVGA050 micro display are investigated and applied.First, this paper proposed a circuit scheme of three-dimensional display system with dual VGA interface as the video input, PIC18LF2550 as the MCU and dual AM-OLED as the micro display. Then the design of the motherboard and OLED panel is introduced, the register of each module that is configured though the ⅡC serial bus by master controller is analyzed in this scheme. Finally, the principle of stereo display function and the means of configuring the stereoscopic controls parameter of SVGA050 micro display are introduced.Stereo display system has been tested by playing the stereoscopic video source of the left and right sides format. Stereo display function has realized on the dual AM-OLED micro displays which size is 1.27 cm(0.5 in) and resolution is 800×600.The effectiveness of the proposed scheme of stereoscopic display interface circuit based on AM-OLED is verified.关键词：AM-OLED;stereo display;dual video;interface circuit
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发布时间：2020-08-12 - 摘要：In order to realize the Timing Controller of TFT-LCD with Mini-LVDS interface based on FPGA,data arrangement of technology of Mini-LVDS and the timing controller of TFT-LCD,the function of FPGA are investigated.By studying data arrangement of Mini-LVDS, a special method of data processing was proposed. A parallel to serial converter was designed by using SRAM embedded in FPGA, the data in a row was divided into a front half part and a latter half part and the two parts of data were put out at the same time.The data of two adjacent points was turned from serial to parallel by using D trigger and the method of delay. By using shift register, serial adder and DDR technology, an 8:1 converter was designed and the data in a sub-pixel was turned from parallel to serial. Output Logic Macro cell in FPGA of Xilinx was used in the design of a data transmitter that turned the CMOS logic level signal into Mini-LVDS logic level signal. The problems of multiple clocks were discussed and solved by using clock macro blocks in FPGA of Xilinx. By studying the characteristics of Mini-LVDS and Timing Controller, the method of generating reset signal and the corresponding method of the data processing were presented.The timing controller of TFT-LCD with Mini-LVDS interface has been applied to products of our company with resolution of 1 280×1 024, the frequency of its data is 108 MHz, and its color depth is 24 bit. The picture of the product is clear and natural.The timing controller of TFT-LCD can satisfy the system requirements of strong anti-jamming and stabilization.关键词：T-CON;mini-lvds;FPGA;Verilog HDL
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发布时间：2020-08-12 - 摘要：A portable multichannel bioelectrical signal processing system is proposed.Through electrode selection according to the actual needs, the system can collect, process, display and store EEG or ECG signal in real-time. Texas Instruments (TI) Company's ADS1198 is employed as the core for the analog front-end circuit, realizing EEG or ECG acquisition, amplification, isolation and other pretreatment operations. Altera Company's FPGA chip Cyclone Ⅱ EP2C70F896C6 is used for processing the data, displaying waveform in the LCD screen of TRBD_LTM.The system has high accuracy, small size, low power consumption, good practicality and scalability.关键词：bioelectrical signals;ADS1198;FPGA;liquid crystal display
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发布时间：2020-08-12 - 摘要：Infrared touch screen works through transmitting and receiving infrared light,which is sensitive in the change of environmental illumination factors.Infrared touch screen will be disturbed in the external strong light environment,leading that the infrared receiving tube receives light intensity abnormally and it may cause malfunction.First, high frequency infrared light transmission and reception is used to filter band component of sunlight interference by the method of lock-in amplifier. Second,the method of the direct exposure of sunlight anti-interference has been realized and its result is proved.In addition,the filter circuit which traditional amplification after stage haves is removed by improving the demodulation algorithm of the lock-in amplifier.This algorithm makes the circuit more simple and reliable.The hardware platform of the actual experiment indicates that frequency selection Q is 145.985,and it can work in the 50 000 lx light environment availably.It proves that the algorithm can achieve good frequency selection,and meet the requirement of anti-glare effect and anti-jamming.关键词：infrared touch screen;anti-glare;lock-in amplifier;select receiver
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发布时间：2020-08-12 - 摘要：In order to obtain high quality real-time full color image with a single image sensor coated with Bayer CFA, this paper researches and designs an improved real-time color image acquisition system based on FPGA. Firstly, design of MT9M011 sensor registers setting timing is introduced. And then, the paper pays key attention to demosaicking algorithm which is critical to the color image quality.The proposed demosaicking algorithm adopts the second-order Laplacian interpolation filter to the Bayer pattern image, and combines with chrominance and gradient for choosing the missing green samples.After the green channel has been reconstructed, we interpolate R and B as the average of the four nearest neighbors. By now, the full color image is reconstructed. Finally, GigE based image transmission is implemented to improve the image throughput. Experimental results proved that on average the improvement is 15 dB over the Bilinear Algorithm (BI) in PSNR and it produces visually more pleasant color images details with color artifacts greatly suppressed. Real-time 1 280×1 024 resolution color image read-out could be achieved at speed 15 f/s. Now, the design is successfully used in our camera system, the perfect restoration quality and effectiveness meets the requirement of system design.关键词：bayer pattern image;demosaicking;GigE;FPGA
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发布时间：2020-08-12 - 摘要：Taking into account the problem that local invariant feature algorithms such as SIFT,SURF take too much time in large images registration,a fast descriptor named FREAK is introduced,and a speeding up method using multi-thread technology is proposed. The process of feature point detection, descriptive characteristics vector generation and feature vector matching of FREAK are introduced and their advantages are analyzed. Then,two ideas of parallel processing are proposed.One is to divide large image into overlapping sub-blocks, and for each sub-image, a new thread is opened up. The other is to use pipelining technology for the three step of registration. Once a feature point is detected, its feature vector is extracted immediately, and soon it matches with the feature vector set of the template image. Rewriting SIFT,SURF and FREAK for experiment,the experimental result indicates that FREAK is faster than the other two algorithms,and our parallel method can greatly economize matching time as well as guarantee the accuracy.关键词：FREAK descriptor;local invariant feature;image registration;parallel;pipelining technology
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发布时间：2020-08-12 - 摘要：The image will be affected by various noise interference in the process.In order to eliminate the noise of the image,an improved self-adaptive threshold wavelet denoising analysis based on LoG operator was proposed.First,the image edge character information was extracted by LoG operator.Then,according to the edge of the image features and the no-edge of the image features,the improved threshold function was calculated respectively:on the basis of soft-thresholding function,a modified threshold coefficient was added for the threshold function in the image no-edge areas;in the no-edge areas, a new threshold function was built combining the energy near the wavelet coefficients with threshold. Finally,dealing with the red,green and blue(R,G,B) channels separately by the improved threshold function,all the details of the image were reserved.Experimental results show that PSNR of the image was above 12.09% compared with the traditional adaptive algorithm;MAE of the image was below 22% compared with the traditional adaptive algorithm.The image of this algorithm has a better quality than others,keeping the edge's information effectively, the integrative denoising is improved obviously.
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发布时间：2020-08-12 - 摘要：Infrared images typically have the problems of low-contrast and blur edges. This article introduces the variation theory of partial differential equations to enhance the infrared images. By reconstructing image gradient field distribution, detailed texture and low-contrast can be improved. The processing of noise consists the cut of amplitude in the transform of gradient field. Based on experiment results, the original image gray gradient can be increased by 2~3 times and therefore significantly enhances the faint information and alleviates the edge effects. This approach can effectively overcome the problem of losing similar gray scale distribution caused by the histogram class algorithms. Therefore, it gives qualified image information for image recognition and tracking application.关键词：image processing;infrared image enhancement;partial differential equations;histogram
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发布时间：2020-08-12 - 摘要：A method of multisensor image fusion and bi-watermarking based on Wavelet Packet Transform(WPT)is proposed in this paper. First, the multispectral and panchromatic images are decomposed into more different frequency subbands by HIS and WPT transform. Due to the properties of the WPT coefficients, a regional energy weighting image fusion algorithm is presented for the low frequency subband coefficients, and for the high frequency subband coefficients, the algorithm uses the absolute value maximum selectivity scheme. Then, the watermarks are embedded in the low and high frequency of the fusion image wavelet packet decomposition. The low frequency watermark uses the DCT energy compression ability and the ability of ridding correlation, and the high frequency watermark uses the streak blocks of the fusion image. Finally, the watermarked fusion image is attacked. The experimental results show that, the watermarked fusion image keeps good spectral information and spatial resolution, and the watermarks embedded in the fusion image are robust and invisible.关键词：image fusion;digital watermark;wavelet packet transform;discrete cosine transform;HIS transform
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发布时间：2020-08-12 - 摘要：Liquid crystal displays have two shortcomings of low CR and power efficiency. Dynamic dimming can help LCD to achieve high contrast ratio and reduce power consumption. Aimed at main-stream backlight products, the paper proposes a global dimming algorithm. The dimming level of the backlight and S-shaped curve are determined based on the characteristic parameters of an input image. The pixels with higher grayscales become brighter and the pixels with smaller grayscales become darker, which improves contrast efficiently.The engineering prototype is developed. When displaying the video consisting different contents common on TVs, the average power reduction ratio reaches 17%. There are no human perceived distortions.关键词：dynamic dimming;S-curve;pixel compensation
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发布时间：2020-08-12 - 摘要：In order to improve the quality of image mosaic,a wavelet and rough set algorithm is established.First, image is decomposed by adaptive wavelet transform, directions of the wavelet of image are set threshold to contrast and balance differences in individual object.Second, feature point is divi-ded the overlapped area, approximation properties in a subset of the divided region are divided into collection of object, lower approximation could be divided into other objects in the collection,reference and input feature vector factors of image are compared and ruled to Simple Euclidean Distance.Third, gap of image mosaic is eliminated by average method and disappeared in other directions.Finally,the whole process is described.The experiments show that this algorithm can made gap smoothly, visual appealing, without overlapping,and entropy of information is 33.872 1 bit, time are 2.436 8 s.It takes less time and has large information.关键词：wavelet transform;rough set;feature points;mosaic
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发布时间：2020-08-12 - 摘要：In order to remove the video image rotation caused by the thwart spin of the optic axis of the airborne photoelectric platform, a real-time image rotation-elimination method based on FPGA processing hardware is proposed. For each video frame, the rotation angle which is the current output of the INS of the airborne photoelectric platform is locked firstly. Then the video image is rotated reversely using the fast image rotation-elimination algorithm and the video image without rotation is obtained. The entire rotation elimination processing system is realized on a single FPGA chip, and it can remove rotation of any angle for the video image with a resolution of 1 024×1 024 of the airborne photoelectric platform in real-time. It can achieve a processing frame frequency of 30 frame/s with an accuracy of 0.1° and its maximum error is less than one pixel.关键词：airborne photoelectric platform;image rotation elimination;FPGA;electronic rotation elimination
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发布时间：2020-08-12
Table of contents
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