最新刊期
期 3 ， 2013
- 摘要：Within the framework of the continuum elastic theory of biaxial nematic liquid crystals, domain walls were studied. Nine different domain walls in biaxial nematics were found. The shapes of these walls are similar to those in uniaxial nematics. By neglecting the elastic anisotropy concerned with splay and bend distortions, it is found that the analytic solutions of splay-bend walls are similar to that of twist walls. The numerical solutions of splay-bend walls show that the ratio of the elastic constants affects the width of the walls.关键词：bixial;domain wall;analytical solution;numerical calculation
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发布时间：2020-08-12 - 摘要：Rear packaging face-plate was fabricated with the cut soda lime flat panel glass. With high effective screen-printing technique, the semicircle-group cathode-grid structure was developed on the rear packaging face-plate surface. The sintered silver slurry layer was used to form the double long-bar electrodes of the conducting electrode group in the semicircle-group cathode-grid structure, and the insulation layer was fabricated using the solidified insulation slurry. On the long-bar electrodes surface, the carbon nanotube cathodes with double semicircle shape were prepared, which was used to emit lots of electrons. The grid was fixed on carbon nanotube cathode of the rear packaging face-plate, and the grid substrate was adopted to separate the grid and the cathode. From the measure results, with the fabricated semicircle-group cathode-grid structure, the capacity effect between the cathode and the grid would be further reduced, the electron emission ability of carbon nanotube cathode could be improved, and the operation flexibility of whole field emission display prototype was also enhanced. Using carbon nanotube as cathode material, the triode structure small-sized field emission display prototype was fabricated, which possessed good field emission characteristics, high luminescence brightness and better luminescence image uniformity. The turn-on electric-field of fabricated triode field emission display prototype was approximate 2.12 V/μm, and the total fabrication cost was low.关键词：fabrication;cathode;field emission;packaging face-plate
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发布时间：2020-08-12 - 摘要：Stereo display is the developing trend of television industry, and Liquid Crystal(LC) lens is a key technology of autostereoscopy display. The LC mixture was used in LC lens required high birefringence and low rotational viscosity. A series of new monomer with dialkyne structure were developed, then its phase transition temperature and birefringence data were measured. After the compounds were substituted by fluorine, lower melting point and wilder nematic phase range were observed. When the new singles were applied to LC mixture, its excellent performance could meet the requirements of LC lens. However the poor ultraviolet resistance ability of dialkyne structure need be solved, which could be improved by adding anti-UV additive and better single purification technology at present.关键词：high birefringence;dialkyne structure;LC mixtures used in LC-lens
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发布时间：2020-08-12 - 摘要：The performances of zinc oxide based thin film transistor(ZnO -TFT)are effected by many factors, such as the qualities of semiconductor active layer and dielectric,and the interface characteristics between active layer and dielectric. Among these factors, the quality of semiconductor active layer is the key factor. However, in the case of active layer, the fabrication method is an important factor. Nowadays, lots of fabrication methods are used to fabricate the active layer of ZnO-TFT, such as atomic layer deposition, pulsed laser deposition, radio frequency magnetron sputtering and solution-processed. In order to intuitively understand the performances of ZnO-TFT by different fabrication methods, and offer the reference for researchers in choosing fabrication methods, the characteristics of these methods are reviewed systematicaly, and the performances of their corresponding ZnO -TFT are discussed. Through comparing the performance parameters of devices, it can be found that pulsed laser deposition and radio frequency magnetron sputtering can make the performances of ZnO active layer better. The optimization methods of ZnO -TFTs are simply described.关键词：zinc oxide;thin film transistor;active layer;fabrication methods
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发布时间：2020-08-12 - 摘要：PEDOT:PSS, widely used in the fabrication of organic optoelectronic devices, is composed of oxidized poly(3,4-ethylenedioxythiophene) and poly(styrenesulfonate) as the counterions. The conductivity of PEDOT:PSS can be greatly improved by chemical or physical treatments. Highly conductive PEDOT:PSS could be one of the alternatives to inorganic semiconductors or metals as the conducting electrodes in optoelectronic devices. In this paper, chemical treatments on PEDOT:PSS are reviewed, including the addition of organic or inorganic materials; the blending with metallic nanoparticles, carbon nanotube and graphene.关键词：conducting polymer;polythiophene;PEDOT:PSS;doping;conductivity
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：This projective autostereoscopic display system based on cylindrical lens grating is composed with orientation-reflecting screen(consists of lenticular grating and diffuse-reflecting screen) and several projectors.It can provide multi-view display and each view has different stereoscopic image.By the analysis of the display principle of this system,the formula of the distance between single projector's primary view port and secondary view port and the formula of the width of primary view port are given.It is given to make sure how many projectors and view ports can be set, how much the crosstalk is,and how much the width of view port under smaller crosstalk is.The accuracy of the formulas confirmed by TracePro.View ports 8~20 are realized in design examples.On the precondition of the crosstalk's each view port is less than 10%, the width of the primary view port is close to the papillary distance and the width of each 3D view port can reach about 40 mm.关键词：autostereoscopic display;projective multi-view 3D display;cylindrical lens grating;orientation-reflecting screen;spherical aberration
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发布时间：2020-08-12 - 摘要：Top-contact organic thin-film transistors array was prepared by slectively dewetting of 6,13-Bis(triisopropylsilylethynyl) pentacene (TIPS-Pentacene) solution. The optical microscope images showed that the morphology of TIPS-pentacene crystal was influenced by the rotation speed. The TIPS-pentacene thin-films prepared at 1 000~2 000 r/min had good connectivity and large crystal domains. As the rotation speed increased to 3 000 r/min, the patterned film became incomplete and the crystal domain size reduced. The output and transfer curve, on/off current ratio, threshold voltage and field-effect mobility of the device were obtained by electric measurements. The TIPS-pentacene OTFTs prepared at 1 000 r/min had a maximum field-effect mobility of up to 5.16×10-2 cm·V-1·s-1 and an on/off current ratio of 8×103.关键词：organic thin film transistor;wetting/dewetting patterned;Electrical properties
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发布时间：2020-08-12 - 摘要：To decrease the influence of defocus on liquid crystal adaptive optics system, improve the imaging quality, a mechanism for defocus compensate has been designed.The mechanism was based on liquid lens, which can change the focal length continuously without any moving part. In order to design the adjust mechanism reasonably, calculation have been taken on the relationship between the rotation angle of the outer ring and the deflection of film center. Then 0.2 diopter is choosen as the division value. The parameters of the mechanism were based on relationship between the rotation angle of the outer ring with deflection of film center and the division value.It shows a good performance in liquid crystal adaptive optics system.关键词：defocus;liquid lens;diopter;liquid crystal adaptive optics system;worm screw
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发布时间：2020-08-12 - 摘要：The principles and methods for measuring polarization modulation characteristics of liquid crystal spatial light modulator (LC-SLM) in special conditions of experiment are proposed. The calibration of phase and amplitude modulation characteristics for the polarized light incident LC-SLM is explored in theory and experiment. The corresponding modulation parameters are determined in experiment when the LC-SLM works on phase-only, amplitude-only or polarization-only mode under special light path setting, respectively.关键词：spatial light modulator;modulation characteristics;phase modulation
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发布时间：2020-08-12 - 摘要：A new wide viewing angle liquid crystal device was developed using PET technology. The liquid crystal molecule was twisted by double electric field. The rising time of the design with negative liquid crystal is slightly greater than the positive's, and the falling time is accordance with the positive liquid crystal. Compared with positive liquid crystal, the transmittance is increased about 10%. The relationship of transmittance with response time and voltage, was analyzed in the effect of three electrodes. The wide viewing angle technology monopoly of FFS and IPS was effectively solved.关键词：wide viewing angle;negative liquid crystal;response time;transmittance
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发布时间：2020-08-12 - 摘要：The NIST ambient contrast ratio measurement method was used in this experiment to measure the ambient CR of different display in market. The samples include: transmissive LCD, transflective LCD, e-Ink, color e-Ink and Interferometric modulation mirasol display. Their sunlight readability were also compared under sunlight by human eyes. The ambient CR of these displays were qualitatively and quantitatively analyzed. Some methods to enhance sunlight readability were found: For LCD, enhancing LCD panel brightness will enhance LCD sunlight readability. for transflective LCD and reflective display, enhancing the reflectivity of display area will enhance their sunlight readability.关键词：sunlight readable;transmissive LCD;transflective display;reflective display;E-Ink
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发布时间：2020-08-12 - 摘要：Combined with color rendering characteristic of the cathode ray tube display, the experiment scheme in which the display shows target grating to measure red-green and blue-yellow color contrast sensitivity was designed. 11 observers were measured to obtain the characteristic data of color contrast sensitivity for human visual system, and the data were fitted. According to the experience of the former and theoretic analysis, the CSF mathematics model to reflect human color vision characteristics was put forward, and the results were compared with foreign ones. The results show that the CSF model based on the display measurement, fitting and theoretic analysis can better reflect the human visual system characteristics. The CSF model is a scientific mathematical model reflecting human visual system characteristic.关键词：cathode ray tube display;human vision system;color space;mathematical model
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发布时间：2020-08-12 - 摘要：There are two independent chromatic variables while matching the color of LED backlight based on three primary colors. Night vision radiant luminance and the departure from the color coordinates of certain reference point are two restrictions, under which there exists one and only best color matching scheme. By means of two variables linear regression analysis,approximate relations between radiance and color coordinates are given. Through trial and error procedure from least three rounds of radiant luminance measurement, the best configuration of color can be calculated. According to the analysis of mean residual, the error of estimated radiation can be less than 2% in basic accuracy of measurements and proper range of sampling points.关键词：NVIS compatible;three primary colors;LED backlight;color matching;regression analysis
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发布时间：2020-08-12 - 摘要：The principle of polarized 3D display is introduced.To deduce the principle of the parallax resulted from polarized 3D display by using Jones matrix, the most accurate retardation value is obtained finally. A kind of compensation film with the negative wavelength dispersion property is applied to the polarized 3D display. In this paper, there are two polarizers and two compensation films composited in the optical system to imitate the parallax pheno-menon made by polarized 3D display. The transmission of the test system can be measured by UV-2450, and the retardation value and the wavelength dispersion property of the compensation film can be measured by the RETS-100. With applying the compensation film with negative wavelength dispersion, the polarized 3D display will produce a better parallax so that there will be less or no demands on the watching pose, which makes more convenient for users as well as the good 3D display performance.关键词：polarizer;compensation film;wavelength dispersion;retardation
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发布时间：2020-08-12
Device Physics & Device Technology
- 摘要：As using digital algorithms alone will lead to lower gray level while the use of simu- lation algorithms alone is difficult to achieve fine-tuning or the circuit is too complex, a method of combining digital and analog is proposed to achieve AM-OLED white balance by using analog simulation and digital adjustment to make up for these shortcomings. Analog simulation is determined by the drive voltage according to the three primary colors. Digital adjustment using LM optimized BP learning algorithm fits the curve of the transmission characteristics of the OLED. Compared with traditional BP algorithms, learning speed of this algorithm is improved, the convergence of the network is accelerated, and it avoids a system into a local minimum. The simulation results and the display results show that this method achieves the white balance of the image.关键词：white balance;L-M optimized;BP learning algorithm;matlab simulation
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发布时间：2020-08-12 - 摘要：A new current-programmed pixel circuit for active-matrix organic light-emitting diode (AMOLED) displays is presented. The pixel circuit consists of three switching thin-film transistors (TFTs), one driving TFT, one capacitor and two control lines . Simulation results show that the pixel circuit can effectively compensate for the nonuniformity of the TFT threshold voltage and the shift of OLED threshold voltage. And the average nonuniformity of the emitting current is 4.63%. Compared with the traditional current-programmed pixel circuits, the connection mode of the capacitor in the pixel circuit makes the circuit works faster.Furthermore, the influence caused by the parasitic capacitor in the pixel circuit is analysed.关键词：active-matrix organic light-emitting diode;thin-film transistor;pixel circuit;current-programmed
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发布时间：2020-08-12 - 摘要：To effectively write and read the calibration coefficients used in LED panel display control system, a display calibration coefficient configuration system based on USB interface and FPGA was developed. Firstly, the serial flash and its application in LED display systems were introduced. Next, an electrical circuit is built, including a FPGA chip and a USB peripheral controller chip. Finally several programs were developed, including a USB firmware, a PC user program and a configuration program for the FPGA. Experiments show that the calibration coefficients can be correctly written and read with this system. Each sector of the flash can be erased in 0.6 s. The data can be written in 2.3 Mbit/s and read in nearly 30 Mbit/s.This system is easy to use, and it can take an important role in the calibration coefficients operation of the LED panel display control system.关键词：serial Flash;LED display;calibration coefficients;USB;FPGA
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发布时间：2020-08-12 - 摘要：The technology of time-sharing driver type LED has become very mature, but parasitic element will be produced in the circuit board level during the operation of the high frequency hardware circuit, which leads to picture crosstalk. The reasons of the parasitic capacitance in the actual circuit are analysed, then the voltage regulator circuit is adopted to eliminate the inter-row parasitic capacitance, and column driver circuit with two state gate output is designed based on FPGA. The experimental result shows that the method proposed can eliminate the image crosstalk phenomenon completely compared with the traditional time-sharing driver type LED.关键词：LED display;time-sharing driver;parasitic capacitance;image crosstalk
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发布时间：2020-08-12 - 摘要：In order to meet the application needs of the front display of the high-performance electronic instrumentation, the scheme that a high-speed FPGA processor controlled low-speed LCD module was proposed. The characteristics of the LCD display module built-in T6963C was elaborated and the hardware interface circuit between FPGA and LCD TG240128A was given. According to the graphical display addressing mode and command setting method, the design of the LCD driver module was completed by using the Verilog HDL hardware language and the graphics display of the image data. The simulation test results show that the display driving circuit based on FPGA can generate the correct timing, send data according with T6963C controller instruction sequence and complete the image data display. The system can effectively solve the problems of the driver and display between high speed FPGA and low speed LCD, and has a certain applications reference value in the visual interface design.关键词：FPGA;graphic display;LCD controller
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发布时间：2020-08-12 - 摘要：This paper puts forward a kind of film notation method. With the OLED devices, annotation information (including aircraft, camera and environmental information) is displayed at the exposure time of the film camera, and the annotation information will image in the film through the object-image conjugate optical system. The experiment indicates that the film image has its annotation information with the advantage of the notation method, and the film pictures provide necessary information for following image processing and analysis,which increases the efficiency of image processing greatly, it also makes for film pictures to be judged, classified and managed.关键词：film;OLED;optical system;notation method;image processing and analysis;notation information
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发布时间：2020-08-12
Driving & Controlling
- 摘要：A method was proposed to eliminate the crosstalk based on image processing. Without changing the device itself, this method can eliminate crosstalk in the 3D image by processing image. With the help of matlab and different crosstalk level of picture, some pictures with different crosstalk levels were simulated and verified.The relationship between crosstalk picture and crosstalk elimination picture based on the perception experiment was analyzed. The experiment results verified the effectiveness of the proposed method.关键词：crosstalk elimination;perception experiment;quality of image
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发布时间：2020-08-12 - 摘要：Single CCD digital color cameras generally use a Bayer mask over the CCD.Bayer filter mosaic is a color filter array for arranging color filters on a square grid of photosensors and each CCD element captures either red, green or blue light. The acquired images have only one of the three color components at each pixel location. In order to improve quality and resolution of the color image, it is necessary that the Bayer pattern demosiacing algorithm is used to reconstruct the missing two components at each location. The linear interpolation algorithm is fast and easy, that has been applied to the demosiacing for image of digital camera. The three classical linear interpolation algorithms based on Bayer pattern is presented in detail, including a pixel doubling interpolation, a bilinear interpolation and a high quality linear interpolation. The basic theories and performance characteristics of the three methods are analyzed. The comparison of the interpolation accuracy as well as the speed of the different methods is based on the sample images.The results show that the high quality linear interpolation has best results on demosiacing performance. And lastly future development of demosiacing is discussed.关键词：Bayer pattern;demosaicing algorithm;color filter array;linear interpolation
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发布时间：2020-08-12 - 摘要：With the background of electronic image stabilization, FPGA-based motion compensation system is proposed to deal with the difficulty in compensating the offset of video and image in real-time. The gray-scale component is extracted to facilitate the post-processing. Ping-pang store is used to solve the problem of large amount of data in de-interlacing with limited hardware resources. To realizes the algorithm of translation, motion compensation using chip SRAM as the frame buffer, realizes translation of the image display through manipulating read/write address and controlling VGA timing while meeting the real-time requirements. The system is all finished by hardware programming. The result shows that the system can satisfy function demand with positive effect and strong expansibility.关键词：FPGA;video capture;video storage;motion compensation
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发布时间：2020-08-12 - 摘要：A novel panchromatic and multi-spectral image fusion method based on non-subsampled Contourlet Transform(NSCT) was proposed for the purpose of improving spatial and spectral resolution of remote sensing images. Firstly, HIS transformation was applied in multi-spectral image for getting its intensity component. Then, NSCT was used both in the intensity component of multi-spectral image and panchromatic image in order that the high frequency and low frequency coefficients were acquired. Furthermore, pulse-coupled neural network (PCNN) and the weighted fusion were used in the high and low frequency coefficients independently. Finally, inverse HIS transform and inverse NSCT were applied to get the fusion image. The experiment results show that many contrast experiments were made. In conclusion, space resolution and information amount of the fused image were both greatly improved.关键词：image fusion;NSCT;PCNN
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发布时间：2020-08-12 - 摘要：In order to collect scientific data of lunar-based extreme ultraviolet camera, generate images, and display these images in real-time, a display system of lunar-based extreme ultraviolet camera is designed. This system adopts FPGA of XILINX Virtex II series as the image acquisition, processing and control core. It has the functions of receiving scientific data, generating and storing the image data, as well as controlling USB interface. The system can communicate with extreme ultraviolet camera based on RS-422 interface, and receive scientific data by LVDS interface. The image data is transmitted to computer through USB bus. And the computer can generate images and display these images in real-time. Imaging experiment, using this system and the extreme ultraviolet camera, has been done. The result of this experiment shows that the system can correctly collect scientific data, generate image data and display image when the photon counting rate is 66 kcps.关键词：extreme ultraviolet camera;image acquisition;real-time display;FPGA;USB
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发布时间：2020-08-12 - 摘要：A new human face recognition algorithm was proposed based on B2DPCA (bidirectional two dimensional principal component analysis) and ELM (extreme learning machine). This method was based on curvelet image decomposition of human faces and an improved dimensionality reduction technique. Discriminative feature sets were generated by using B2DPCA to train and test ELM classifier. The recognition accuracy can be improved by using this method. Extensive experiments were performed by using databases and results were compared with state of the existing techniques. The results showed recognition accuracy and minimal dependence on the number of prototypes were significantly improved by using B2DPCA and ELM algorithm. The local characteristics and global information based on curvelet decomposition are expected to apply to the recognition accuracy and speed of classification in the future.关键词：human face recognition;B2DPCA;extreme learning machine;dimensionality reduction technique;recognition accuracy
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发布时间：2020-08-12 - 摘要：Because LCM's drive control module performance is low, in order to make the color LCD module's image color enhanced and keep the original color unchanged, an image enhancement algorithm suitable for low performance control module was proposed. The algorithm uses color space grayscale value with the same scaling of scale factor and the gray value does not overflow. The pixel RGB components will obtain the same enhancement. The experimental results show that the computational complexity of the algorithm is small, the color of the enhanced image is richer, and the overall performance is excellent.关键词：image enhancement;color space;the second curve;evaluation index
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发布时间：2020-08-12 - 摘要：Computing disparity images for stereo pairs of low texture images is a challenging task because matching costs inside low texture areas of the stereo pairs are almost similar. This problem can not be solved straightforwardly by increasing the size of aggregation windows or by using global optimization methods, e.g. dynamic programming, because those approaches will smooth depth discontinued boundaries as well. This paper proposes a new method that is able to robustly perform stereo matching for low texture stereo images. First, edge detection and Sobel filtering are performed for the images; second, edge maps is used to guide the aggregation of pixel matching costs; Finally, disparity computation and left-right validation(≥88%) are used to get the disparity maps. Experimental results demonstrate that the proposed method utilizes the edge maps computed from the stereo pairs to guide the cost aggregation process in stereo matching, and can produce a larger number of and a better accuracy of reliable disparities for low texture stereo images than the moving average method.关键词：3D reconstruction;stereo matching;cost aggregation;left-right validation;winter-take-all
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发布时间：2020-08-12 - 摘要：In order to get clearer and more qualitative image, an embedded high speed image enhancement processing system on high performance DSP TMS320C6455 and FPGA was designed, and a new fast color image enhancement algorithm is presented. First, the color image is transformed from RGB to HIS. Then multi-scale retinex algorithm is adopted in the brightness image. Finally the color image is transformed from RGB to HIS. Experimental results with real images show that the system can improve the contrast of the fog-degraded image, effectively enhance the color image and shorten the running time of the program, which can meet the project.关键词：color image enhancement;multi-scale retinex algorithm;contrast;adaptive scale
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发布时间：2020-08-12
Imaging Technology & Image Processing
- 摘要：Two kinds of fluorinated negative liquid crystal compounds were synthesized. Two series of nematic liquid crystals were measured by polarised optical microscopy with a heating stage and differential scanning calorimetry and their good mesomorphic properties were observed.For example, the negative liquid crystals introducing 1,4-perfluorophenylene to molecular structure of diphenyl acetylene have high birfringence and low rotational viscosity. The result shows that the liquid crystal compounds with ethylidene bridge could have low birfringence and low viscosity. The first type of compounds could be used in adaptive system like as application in construction of spatial light modulator; the second type of compounds could satisfy the requirements of a low viscosity component in TFT-LCD .Two target compounds were synthesized by sonogashira coupling reaction and then Pd/C catalytic hydrogenation.关键词：fluorinated liquid crystals;diphenyl acetylene;ethylidene;negative liquid crystals
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发布时间：2020-08-12
Research Letter
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