最新刊期
期 4 ， 2014
- 摘要：The all-inorganic display device based on colloidal quantum dots have the better electroluminescence and environmental resistance characteristics than OLED, and will become the next generation flat panel display. In this paper, the advantages and potential of all-inorganic colloidal quantum dots display are described, including the quantum dot display device with GaN charge transport layer, the quantum dot display device with metal oxide charge transport layer, alternating current driven multilayer structure transparent quantum dots display device and the colloidal quantum dots display device with a unipolar device architecture. The major research direction such as charge transport mechanisms of all-inorganic colloidal quantum dots display devices, new quantum dot electroluminescent material, new device structures and new device drive mechanism to improve the electroluminescent efficiency of all-inorganic display devices was also discussed.关键词：display device;colloidal quantum dot;all-inorganic display device;external quantum efficiency
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发布时间：2020-08-12 - 摘要：Butene liquid crystal has low viscosity,low melting point,high clearing points,low temperature stability. It can improve the properties of mixed crystals effectively and has broad prospects as a kind of liquid crystal monomer. Based on the 2-fluor-4-bromo iodo benzene and boric acid,2 - fluoro - 4- bromo -1 -ethyl acetate biphenyl was got by coupling,acylation,alcoholysis. And 4- chlorine methyl-2'-fluoro-4"-propyl-1,1'4',1"-terphenyl was got by propyl benzene boric acid coupling,reduction,chlorinated. Then coupling with Grignard reagent of 3-chlor propylene,the target product 4-(but-3-en-1-yl)-2'-fluoro-4"-propyl-1,1'4',1"-terphenyl is obtained after seven step reaction,and the total yield is 21.7%. At last,the compounds were IR,H1NMR,GC-MS characterization.关键词：Butene liquid crystal;synthesis;4-(but-3-en-1-yl)-2’-fluoro-4"-propyl-1;1’1"-terphenyl
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发布时间：2020-08-12 - 摘要：In order to realize the influence of iodide impurity on TFT liquid crystal mixture,the experiments of adding iodide impurity in the TFT liuquid crystal mixture was designed.Based on the effects of UV light and low current,the relationship between the VHR test value of TFT liquid crystal mixture and the iodide concentration was analyzed. Experimental results indicate that,in the condition of UV light and low current,the VHR value of TFT liquid crystal mixture will be significantly decreased because of the decomposition of trace iodide impurity.If the iodide concentration in the liquid crystal mixture is higher,the reliability of the liquid crystal mixture will be more worse.Under the condition of this experiment,the reliability of liquid crystal mixture has obvious variation when the iodide concentration is over 20×10-5.关键词：iodide;TFT;liquid crystal;reliability;VHR
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发布时间：2020-08-12 - 摘要：Using 99.99% pure nitrogen and argon as sputtering gas, p-type N doped Mg0.07Zn0.93O film was deposited on quartz substrate by radio frequency magnetron sputtering with Mg0.04Zn0.96O target. The film has resistivity of 21.47 Ω·cm, Hall mobility of 3.45 cm2/(V·s) and carrier concentration of 8.38×1016cm-3.The structure and optical properties of this film were studied.The Raman peaks of the N for O site (NO) at 272 and 642 cm-1 were observed in the Raman spectrum. At the low tempe-rature (80 K), the photoluminescence spectrum of the p-type MgZnO:N film showed three emission peaks centered at 3.201,3.384 and 3.469 eV, respectively. The 3.384 eV peak should originate mainly from recombining by conducting electrons to the defect level while the 3.469 eV peak originated mainly from acceptor bound exciton (A0X) emission. It can be deduced that the p-type conduction of this N doped Mg0.07Zn0.93O film was primary attributed to NO acceptor defects.关键词：radio frequency magnetron sputtering;thin MgZnO films;N doped;p type
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发布时间：2020-08-12 - 摘要：The interaction force between polymer network and liquid crystal molecules was adjusted by controlling two monomer ratio,the photoelectric performance of the PSCLC was also improved by the method. Polymer stabilized cholesteric liquid crystal was prepared by the method of UV polymerization induced phase separation (PIPS). As the concentration of RM257 decreased,the saturated voltage reduced and the field-off response times of PSCLC increased with the polymer network changing from fiber-like to crosslink-like. When the proportion of RM257 and BAB6 is 1:4,the contrast reach maximum.关键词：polymer stabilized cholesteric liquid crystal;different monomer ratio;polymer network;photoelectric performance
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发布时间：2020-08-12 - 摘要：In order to improve the yield of hexakis(4-dodecy)-peri-hexabenzocoronene, a new synthetic approach is designed. First, hexa(4-iodophenyl)benzene is synthesized by cyclotrimerization of diphenylacetylene and then iodosubstitued. A palladium catalyzed Kumada cross-coupling reaction of 1-Bromododecane with that intermedium and cyclodehydrogenation are utilized in the last two reaction steps. The chemical structure of the target compound is characterized by 1H NMR and elemental ana-lysis,and the optical, thermal and electrochemical properties of this HBC material are studied. The yield is improved to 40.9%, which showed 13% higher than that of the general method. This novel synthetic routine has advantages of simpler purification, fewer reaction steps and lower costing over that reported in the article before.关键词：hexa-peri-hexabenzocoronene;synthesis;discotic liquid crystal;yield;cyclodehydrogenation
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发布时间：2020-08-12 - 摘要：1-[(1-ethoxycarbonyl)-ethyl]-4-[4-(2,3,5,6-tetrafluoro-4-alkoxy-phenyl)ethynyl)-phenyl] terephthalates have been synthesized(n=5,6,7,8) and studied by thermal polarizing microscopy and DSC measurement. The effect of fluorosubstituent and bridge on the mesomorphic properties were discussed. These compounds exhibit enantiotropic cholesteric phase and low viscosity high birefringence and chemical stability. These compounds can be used for reflective LCDs and adaptive optics system. The target compounds were synthesized by Sonogashira cross coupling.关键词：fluorinated liquid crystals;tolane;cholesteric;birefrigence
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发布时间：2020-08-12 - 摘要：The new study of black matrix thinner for TFT-LCD was presented in this paper. Based on the normal process technology,breaking through the limits of equipments and process bottlenecks,the affection of thinner black matrix critical dimension was worked out by adding phase shift mask and back exposure. The results show that black matrix critical dimension could be reduced 1.0~1.5 μm by applied on phase shift mask that decreased the diffraction of transmission edge area. Because the back exposure technology could cure the black matrix material,the black matrix critical dimension was reduced 0.3~0.5 μm. By the new technology and equipment applied,the black matrix critical dimension was decreased 1.5~2.0 μm at total,which meets the requirements of high quality transmit and contrast.关键词：Black Matrix;critical dimension;phase shift mask;back exposure
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发布时间：2020-08-12 - 摘要：High electroluminescence intensity based organic light emitting diodes (OLEDs) with millimeter-scale concavo-convex interface were addressed. Using template with double-slits up to 10 nm-height-protrusion, a maximum power and current efficiency of 23.9 lm/W and 45.6 cd/A were achieved, enhancing 70% and 36% compared with the optimized general planar device structure, respectively. The enhancement in luminescence intensity can mainly be attributed to the localized sur face plasmons (LSPs) induced by the metallic corner because the effective scattering of the LSP-metallic corner would result in enhancement in light extraction efficiency. More detail enhancement mechanism of the EL intensity was also argued.关键词：OLED;concavo-convex interface;efficiency
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发布时间：2020-08-12 - 摘要：In the LED side lighting of LCD(Liquid Crystal display)backlight module,in order to reduce the influence from the non-mixed area near the light source for the effective uniform illuminating area of the light guide plate,the micro structure on the incident surface of light guide plate is studied. A micro-prism film with prisms array is designed without changing the distance between LED and incident surface,as well as the spacing between adjacent LEDs,it is pasted on the incident surface of the light guide plate. The results show when the apex angle of prism is 105°,the emission angle is the largest. The astigmatism of micro-prism film can reduce the non-light mixed area from original 4 mm to 2 mm. It increases the light mixing zone area near the light source effectively. This research is significant to the micro structure design on the incident surface of the side lighting backlight module.关键词：backlight module;LED side lighting;non-mixing area;micro-prism film
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发布时间：2020-08-12 - 摘要：In order to control the light intensity of a certain environment,a liquid crystal self-regulation system of exporting fixed light intensity is put forward and its principle and functions is also studied. First,the electric-optic modulation principle using liquid crystal and the control principle of photoelectric sensor and single-chip microcomputer are introduced. Then,the exploitation of this system is illustrated and the configuration and the operating principle of every module are introduced in detail. This system has four functions as follows:maintaining light intensity invariant in a specific space; adjusting light intensity in a given space; displaying the current working state; testing the liquid crystal's electro-optical curve. This system is suitable for the constant light intensity environment and the constant temperature system which makes use of light energy.关键词：liquid crystal;self-regulation system;electro-optical effect;photoelectric sensor;single-chip microcomputer
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发布时间：2020-08-12 - 摘要：Realizing high PPI (Pixel Per Inch) requires finer line width and spacing,but it is difficult because of the restrictions of resolution of MPA (Mirror Projection mask Aligner) exposure equipment,so improvement of photolithographic resolution based on no modification of MPA exposure equipment is investigated. First,we compared the intensity distributions results of equidistant lines (2.5 μm) of the conventional binary mask and PSM (phase shift mask) when defocus is zero by software simulation,then defocus dependency is obtained by simulation analysis according to the MPA equipment parameter. Finally,exposure latitude and SEM profile of the conventional binary mask and PSM in the same condition was compared. Experimental results indicate that PSM can double the process margin of the space or line beyond MPA resolution,and make the CD(critical dimension) distribution more concentrated and increase the stability of the fine line. Thus it concluded that lithography resolution of MPA can be improved by PSM.关键词：phase shift mask;equidistant lines;simulation;exposure margin;resolution
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发布时间：2020-08-12 - 摘要：The pure Al films were widely used as the thin film transistor (TFT) gate electrode, but the TFT mass production yield is easily influenced by hillock phenomenon happened in pure Al film in heating process. The pure Al films were prepared at different deposition temperature by the magnetron sputtering in the experiment. The hillocks and the pure Al films were characterized by electrical test instruments,the scan electron microscopy (SEM) and stress tester. It was found that the hillock density and size reduced when the deposition temperature increased because of the larger grain size of the pure Al films and the higher yield temperature point in the stress-temperature curve. So the deposition temperature should be advisably increased to limit the hillock quantity for improving TFT array process yield.关键词：TFT array process;magnetron sputtering;pure Al film;hillock;mass production yield
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发布时间：2020-08-12 - 摘要：High-performance mobile phone cameras are MIPI interface currently,its signal can't be collected by FPGA or DSP directly. However,with the miniaturization trend of equipment and improvement of the performance,using mobile phone cameras becomes one of the most important schemes in the military and industrial areas. In order to use mobile phone cameras in the areas mentioned above,this paper presents a common MIPI-PHY which can receive and process MIPI signal. An appropriate FPGA is adopted to collect the special voltage-level signal by designing electrical matching and pin construction. According to the signal protocol,the aliasing MIPI signal is processed,separated and integrated sequentially,then image information is decoded into common LVCMOS signal according to the integrated signal. Under the condition that frame rate is 22 fps and image resolution is 3 256×2 448,a high imaging quality is achieved via this system with no distortion and frame losing. What's more,with powerful transplantable capability and parallel signal,the program can satisfy developer's need and is already applied into some projects.关键词：mobile phone camera;MIPI-PHY;FPGA
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发布时间：2020-08-12 - 摘要：In order to realize wide viewing angle of liquid crystal display,this paper presents the design principle and method of one 54.6 cm (21.5 in) liquid crystal display with wide contrast viewing angle of liquid crystal panel and wide brightness viewing angle of backlight unit. First,through the introduction of structure and design of fringe field switching mode,the principle of wide contrast viewing angle of this liquid crystal panel is explained. Then the design method of brightness viewing angle of backlight unit is introduced,a variety of combinations of optical films were tested and optimal combination with biggest brightness viewing angle was chosen. Test data of practically-fabricated liquid crystal modules show the contrast viewing angle can achieve 90°/90°/90°/90°,and one half brightness viewing angle in horizontal direction can achieve 60°,corresponding to the data of luminance uniformity-angular dependence 1.20. This liquid crystal display has obvious advantages on contrast and brightness viewing angle compared with similar products.关键词：wide viewing angle;fringe field switching;optical film;backlight unit
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发布时间：2020-08-12 - 摘要：A general purpose parameters industrial remote monitoring system is designed based on S3C2440 processor for remote monitoring the industry site. The algorithms of command/data transmission and interface tree linked list interactive algorithm are investigated. The system uses S3C2440 to directly drive the TFT liquid crystal screen and four-wire resistance touch screen. And the self-designed monitoring software interface communicates commands and data with the in-site devices through RS485 port. The system is applied to the remote current-temperature monitoring system, and commands are sent through touch screen, data is updated in real time. Compared to traditional methods, our system is easy for further developments and use, general purpose and low cost. In addition, the complexity does not depends on the number of parameters. Therefore, with the increasing of the parameters' number, the cost is less than 5% of traditional methods, which will make it possible to satisfy many applications of remote industry monitoring in site with low cost.关键词：S3C2440;monitoring;interface
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发布时间：2020-08-12 - 摘要：In view of the problems of large volume of data,dealing with parallax image accurately,which existed when the embedded naked-eye 3D device displaying stereo pairs image on the left and right eye sub-screen simultaneously,a video signal conversion system combined with ARM and FPGA is proposed after a careful study about the characteristic of the left and right format stereo image and LCD's video signal. As a video player and peripheral supporter,the ARM system provides the video signal source for FPGA.FPGA is used as the core of signal processing,the video data from ARM is collected,stored and converted. The new data format matches the naked-eye 3D LCD screen structure for acquiring the stereoscopic effect. Experimental results indicate that the system completes the distribution and fusion of left and right format stereo video's data correctly,and it can satisfy the embedded naked-eye 3D device for the video signal conversion. The logic design of FPGA only uses the internal resource to realize image data memory and columns interpolation,which can improve the reliability of the system and reduce the cost.关键词：naked-eye 3D display technology;video interface;FPGA;columns interpolation
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发布时间：2020-08-12 - 摘要：The design of dual-port video buffer based on FPGA and SDRAM is introduced. The user interfaces are composed of small capacity synchronous FIFO and asynchronous FIFO in series connection. The SDRAM is accessed in burst mode. The arbitrator uses a modified algorithm to grant the right to use the bus of SDRAM. The single memory can store the captured data and provide data for displaying simultaneously. Experimental results indicate when SDRAM works in 71 MHz, there are no error in the video data transmission. This system is simple and easy to be debugged. By changing relevant parameters of FIFOs and length of the block,the actual bandwidth of SDRAM can achieve a high performance.关键词：FPGA;FIFO;SDRAM controller;arbitrator
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发布时间：2020-08-12 - 摘要：Motion target detection plays an important role in object tracking and traffic monitoring fields. For improving the estimation accuracy of motion direction, and thereby increasing restoration resolution, some research of blurred image spectrum analysis, blurred direction detection and interfe rence suppression were conducted. The interference of bright cross in the spectrum caused by edge truncation effect was eliminated through partitioning spectrum image. The diagonal interference was reduced by normalized Radon transform. For improving estimation accuracy of blurred direction of any ration image, the factor aspect ratio was used to modify the relation between tilt angle of the dark stripe and motion direction angle. The experiment demonstrates that this algorithm can well avoid interference peak appeared in 0°, 90°, 45°(135°) direction of blurred direction estimation curve, and well estimate blurred direction in non-diagonal with about 4~6 °error. Overall, this algorithm can suppress the interferences of bright cross and diagonal effectively, and applies to any aspect ratio.关键词：video monitor;motion blur;blurred direction estimation;normalized radon transform
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发布时间：2020-08-12 - 摘要：In order to achieve exact and consistent segmentation result using two-phase high resolution aerial images of the same area which contain some changed information,a joint segmentation method is proposed. First,the two-phase images are manipulated using Guassian smooth filter to suppress the object's internal diversity and avoid over-segmentation. Then principal component analysis is carried out on the combined image contained all bands of two-phase images to eliminate the redundant information. And the first principal component will be as gray component. Finally,texture is extracted from two-phase origin images as texture component,and meanshift algorithm will be implemented on the image combined gray component with two-phase texture components. Experimental results indicate that the proposed method can use the image information effectively and save much processing time. It can obtain better segmentation result.关键词：joint segmentation;Meanshift;principal component analysis;texture analysis
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发布时间：2020-08-12 - 摘要：In order to improve the quality of image segmentation, Graph Theory Threshold Algorithm is established. First, map function is constructed between the graph and image, each vertex is mapped by point, each edge is mapped by line. Second, decision table of image edge is set by attribute of area, gray feature is defined weight coefficient between pixel of different points and groups, decisions of attribute weight are constructed with figure of pixel. Third, similar of pixel is computed by cluster between object and background class, minimum spanning tree method solved the problem of pseudo cut set. Finally, process is described. The experiments show this algorithm made image edge clearly, eliminate the over and under of merger phenomenon, entropy of information is 28.7803 bit, time are 1.454 3 s. It takes less time and has large information.关键词：graph theory;threshold;segmentation;pixel
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发布时间：2020-08-12 - 摘要：In order to obtain image features that can be well exploited in long distance target recognition and are computationally efficient,an algorithm combining scale-space FAST (Features from Accelerated Segment Test) corner detector and SURF (Speeded Up Robust Features) descriptor,is proposed in this paper. The Fast-Hessian matrix based keypoint detector used SURF algorithm,is apt to extract numerous keypoints from non-informative edges with relatively high Fast-Hessian response,leading to considerable amounts of low-distinctive feature and consequently high rates of mismatch; with Gaussian filters employed,the possible amount of keypoints extracted with Fast-Hessian from regions of small targets is largely reduced due to image blur,which leaves difficulty for recognition of long distance targets. To address these problems,the proposed method uses a scale-space FAST corner detector in place of the Fast-Hessian detector,combining with SURF descriptor for its distinctiveness. The proposed method effectively eliminates the problem of extracting interfering keypoints along image edges,performing a significantly better detection of keypoints on long distance targets than Fast-Hessian,and generates features of better distinctiveness than BRISK features,which uses FAST as well. The experimental results indicate that the recognition algorithm based on the proposed features gives better performance against targets with change in scale,illumination and 3D viewpoint than that either based on SIFT,SURF or BRISK; the proposed feature can be well applied to long distance target recognition,while reaching a comparable computation speed to SURF.关键词：target recognition;image features;keypoints;FAST;SURF
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发布时间：2020-08-12 - 摘要：Line is the most basic metafile of airborne cockpit display. Its display quality greatly affects the display of the entire frame,and the "twist" of small-angle line has been one of the key issues affecting the display effect. To get better display of small-angle lines,a new lightness gradient algorithm based on Wu is introduced in this paper. This algorithm reduces the lightness distortion in straight line's subshaft to eliminate twists,which makes it looking like a smooth line. The Matlab simulation and FPGA implementation results show that compared with other anti-aliasing algorithm,the new algorithm improves remarkably the display quality of small-angle lines,while there is no increase in the processing time after combined with midpoint paint line algorithm. Furthermore,the new algorithm can also improve the display quality of large-angle lines and arcs by eliminating the jagged edges of large-angle lines and solving the blur problem of small-angle arcs. Therefore,the improved algorithm can be applied to airborne cockpit display system,which needs high display quality and real-time urgently,in order to relieve visual fatigue of the pilots.关键词：cockpit display;anti-aliasing;Wu algorithm;small-angle;FPGA implementation
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发布时间：2020-08-12 - 摘要：Along with the weapon research development, more and more weaponry with high speed and high mobility are equipped in our country. In order to make target tracker of the weapons have good robustness under the situation of the target scale changed and high speed, a real-time target tracking system based on DSP+FPGA was designed. The MeanShift Algorithm was improved by using multi-level pyramid and the background weighted kernel histogram, which can reduce the influence of background in the tracking box, then the whole algorithm was optimized to implement on the embedded system in real time. The experimental results show that the design of the real-time target tracking system is robust for the rapid motion of the target, scale changing, and some degree of fuzzy. The average processing time per frame was 13.5 ms, which can meet the engineering requirements of real-time and stability.关键词：DSP;FPGA;mean shift;target tracking
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发布时间：2020-08-12 - 摘要：In terminal guidance tracking phase,the missile's flight attitude,the distance from missile to the target and target's moving status and appearance change a lot. Using a single fixed template cannot achieve stable tracking. In this paper,a new subspace-based moving target tracking algorithm is proposed. First,a set of orthogonal sparse subspace feature vectors are used to describe target model. Then,using incremental method to continuously update the subspace model to accommodate the target changes in appearance which is caused by intrinsic and extrinsic factors,therefore,the tracking accuracy is improved. Finally,importance sampling algorithm and maximum likelihood estimation are applied to solve complex optimization problems. Experimental results show that when the camera and the background suffer larger relative motion and target status changed dramatically,the algorithm can still be able to achieve sustained and stable tracking,and the average tracking error keeps less than 10 pixels. It can satisfy the system requirements of stability and robustness for terminal guidance tracking.关键词：terminal guidance;target tracking;subspace;sparse matrix
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发布时间：2020-08-12 - 摘要：Becasue the traditional ethylene gas leak detection and localization method has the problem of low efficiency,small detection area and poor real-time performance,a leakage detection method based on infrared imaging was proposed. The method uses infrared camera to acquire infrared video image of ethylene production workshop when equipments are working,and converts it to grayscale image sequence. The image information after multi frame diffe rence and background difference was cumulated together through the use of logic operation,and noise interference was eliminated through morphological filtering. At last,the accurate position of suspected gas leak area was obtained. The experimental results indicate that this method is efficient,accurate and real-time,and can obtain a complete,clear leakage suspected areas.The purpose of preliminary localization of the colorless gas leakage area has been achieved.关键词：gas leaking detection;infrared imaging;logic operation;morphological filtering
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发布时间：2020-08-12 - 摘要：In order to enhance the color images in real time, this article proposed an algorithm of piecewise stretching based on interpolation. Firstly, the RGB color image is converted into HSV space. In this space, the histogram of the image is stretched based on interpolation. By using this method to enhance the image, the details of the image are more rich, the image clarity is improved obviously and the visual quality of the images has also been significantly improved. Gray average gradient value of enhanced image after this algorithm is 1.95 times than histogram equalization. In this paper, field programmable gate array (FPGA) is used as central processor. By using of parallel processing and pipelining technology, we completed the conversion of the image space and the algorithms of real-time image enhancement, simplified system design, and make the processing system more compact, the operation more reliable. The paper also gives the system functional modules. After debugging, this system could complete the processing of data 30 ×1 024×1 024 ×24 bit per second. Compared with the traditional image enhancement algorithms thus as the histogram equalization, this algorithm reduced the time about 0.807 ms. The system has the characteristics of high integration,fast image processing speed and strong real-time.关键词：color images enhancement;piecewise linear stretching;FPGA
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发布时间：2020-08-12 - 摘要：In order to collect the mass data loaded from wide angle aurora imager and analyze remote data to display images in real time, the image acquisition and fast display versatile detection system for wide angle aurora imager are designed and implemented. According to system requirements, by utilizing data grabbing card to receive remote data from RS-422 interface, the software which is developed on computer with VC++ uses joint programming of multithread and timer to achieve data acquisition, data analysis and image fast display at the same time, as well as other functions, such as photon count rate display,brightness value display, brightness value adjustment, original data curves generation, image replay and image partial amplification. Through joint test of the system and wide angle aurora imager, the results indicate that this system could receive remote data correctly, analyze parameters exactly and multi-mode image data and quickly display images, all functions could execute correctly and run stably. The system could reflect instrument status correctly in real time, which is the integral part of each phase in development of wide angle aurora imager.关键词：wide angle aurora imager;VC++;image fast display;versatile
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发布时间：2020-08-12 - 摘要：A large field view TDICCD camera is butted by multi-chip TDICCD, which outputs multispectral(MS) and panchromatic(PAN) images by multi-channel. For the good result of image fusion and mosaic, a registration method based on bilinear interpolation is proposed in the field of spatial correlation. Firstly, the multi-spectral images are magnified by image processing of bilinear interpolation algorithm. The MS image has the same size as the PAN image. Secondly, in the field of spatial correlation, a registration method based on bilinear interpolation is applied on the MS and PAN images, and the two channel images having overlapping pixels are mosaiced. The experimental results show that, the proposed methods have higher rapidity, noise immunity and robustness, which makes the multi-channel registration of the large field view TDICCD camera obtain good results.关键词：image registration;bilinear interpolation;spatial correlation
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发布时间：2020-08-12
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