最新刊期
期 1 ， 2015
- 摘要：Liquid crystal wavefront corrector can easily achieve 10 μm phase stroke correction through kinoform diffraction pattern. Therefore, the liquid crystal adaptive optics (LCAO) system is very promising in the field of astronomical observations in the 21st century. Disadvantages of the liquid crystal wavefront corrector are low response speed and low energy efficiency. Our group not only solves the energy problem, but also continuously improves the performance of speed. The LCAO system developed by our group is connected to the 1.23 m telescope. As a result, Saturn and its planetary ring was clearly observed, and the α-Com binary was also resolved. The imaging resolution is up to 1.8 times of the diffraction limit of the 1.23 m telescope. Currently the system is only a 2 ms delay, and it has entered the engineering stage. Therefore, the LCAO system has potential applications in 8 to 10 m large diameter astronomy telescope.关键词：liquid crystal wavefront corrector;adaptive optics;telescope
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发布时间：2020-08-12
Invited Paper
- 摘要：On the basis of Berreman 4×4 matrix,the theoretical model of optical rotatory rate of short pitch CLC(Cholesteric Liquid Crystal) was established and calculated. Variations of the optical rotation angle with external factors like incident angle,pitch and the thickness of LC cell were simulated by MATLAB and also verified by experiments. Experimental research on temperature sensor of CLC optical rotatory was studied as well. The optical rotatory angle curves with temperature of CLC from pitch 250 nm to 310 nm in different conditions were measured by polarimeter to get the thermal sensing rotatory characteristics of CLC. Results illustrated that CLC optical rotatory angle varies obviously and regularly with temperature in different conditions even though there's differences on different pitch. The stability of its thermal sensing effect was verified by experiments too. The results proved that CLC can be used as a potential thermal sensing materiels. The study provided experimental basis for CLC's use on temperature sensor.关键词：short pitch CLC(Cholesteric Liquid Crystal);optical rotatory rate;Berreman 4×4 matrix;thermal sensing materiels;temperature sensor
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发布时间：2020-08-12 - 摘要：The structure and characteristics of double-twist structure of blue phase liquid crystal (BPLC) II are researched, the relationship between the defects and the structure of double-twist cylinder is analyzed, and the reason that produces the position of defects is explained. The traditional method which makes the model of BPLC II structure is described, and a new method to make the model of the BPLC II structure is proposed, the molecular arrangement in the whole space can be built. The optical characteristics are simulated using finite difference time domain method and the BPLCD II structure. When the circularly polarized light is used, the result showed that the transmissions of the left-handed and right-handed circularly polarized light are obviously different; the circularly polarized light which is same to the twist direction of BPLC is reflected in certain wavelength range.关键词：blue phase liquid crystal;double-twist structure;defect;FDTD
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发布时间：2020-08-12 - 摘要：The paper introduces the structure factors of the formation of large birefringence liquid crystal compounds and acetylenic large birefringence liquid crystal compounds. The study found that, two aryl substituted acetylene (PTP) liquid crystalline birefringence is in the range of 0.25 ~ 0.49; double alkyl diphenyl acetylene (PPTP) liquid crystal Δn in the range of 0.32 ~ 0.5; bis two acetylene (PTTP, PTDTP, PTPTP) liquid crystalline birefringence in the range of 0.35 ~ 0.67; terphenyl acetylene benzene liquid crystal compound delta n value is about 0.54; cyano or isothiocyanate benzene alkyne liquid crystalline birefringence is in the range of 0.25 ~ 0.79; condensed ring group phenylacetylene liquid crystal birefringence in 0.36 ~ 0.79.Liquid crystal materials containing acetylenic benzene have large birefringence and practice value.关键词：high birefringence;liquid crystal;alkynes;phenyl acetylene
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发布时间：2020-08-12 - 摘要：In order to obtain fast response liquid crystal optics devices, six kinds of single fluorinated isothiocyanate phenyl-tolane liquid crystal compounds were synthesized via couple reaction and reduction. Δn value of these LCs is very high, about 0.432~0.681. IR and HNMR spectrograms indicated that the structure was correct. DSC test results showed that these LCs became into liquid crystal phase at about 90 ℃. When these LC compounds were mixed in the commercial alkyne LCs respectively, the LCs compounds with its fluorine atom at 2 position exhibited low viscosity, but the LCs compounds with its fluorine atom at 3 position had better figure of merit. Of course, these LCs compounds could be used in the LC optics devices.关键词：single fluorinated;liquid crystal;Δn;fast response;figure of merit
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发布时间：2020-08-12 - 摘要：In order to meet the different demands of the LCD, six novel polyflurinated dielectric anisotropy liquid crystalline compounds were synthesized. These compounds were synthesized from 2,3-difluoro-propylbenzene or 2,3-difluoro-1-ethoxybenzene by several steps. Their constructions were confirmed by NMR,elemental analysis and GC-MS. The parameters and the performances of these products were measured by DSC, Abbe refractometer and capacitance inductance tester. These polyfluorinated compounds have large optical anisotropy(Δn=0.22~0.33)and large negative dielectric anisotropy(Δε=-7.63~-12.02). These compounds can be used in the LCD matrix to improve partial performance of the LCD. The preparation method is of simple operation and low cost (totle yield: 50%), which can also realize industrialization easily.关键词：liquid crystal;negative dielectric;polyfluorinated;large Δ&epsilon
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：At present, the LCD industry is maturing. The panel enterprises continue to improve competitiveness of their products, high resolution, high color gamut, narrow bezel and high contrast ratio and so on. This paper expounds how to improve contrast ratio with the polyimide orientation material. Laboratory research and production line test has been done. By comparing the Advanced Super Dimension Switch (ADS) mode liquid crystal panel with the different orientation material, it concluded that the higher the orientation materials, the higher the contrast ratio to get the panel was. With high force orientation layer, it can have the better arrangement of the liquid crystal molecules. For normal dark pattern FFS display, the lower pre-tile angle of the liquid crystal molecules, the better LCD darkness and contrast ratio will be improved.关键词：polyimide;alignment film;advanced super dimension switch;contrast ratio
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发布时间：2020-08-12 - 摘要：Die burn probability of GOA TFT LCD product is very high in shorting bar testing. Testing waveforms with higher source voltage than the theory were designed. Testing samples were tested in two testing waveforms respectively. Experimental results showed that die burns probability is same in two testing waveforms. A current limiter is added on each testing signal output of testing driving plate. Testing samples were tested on two testing fixtures respectively, one loaded current limiter, the other not. Experimental results show that die burns probability is also same. Anti-static measures had been used to a shorting bar testing fixture. Testing samples were tested on two shorting bar testing fixtures, one with anti-static electrostatic measure, the other not. Experimental results show that die burns probability is zero using the anti-static electrostatic fixtures. Result of three experimental showed that the root cause of die burn is Electro-Static discharge.关键词：TFT LCD;GOA;shorting bar testing;ESD
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发布时间：2020-08-12 - 摘要：The performance of vanadyl phthalocyanine (VOPc) thin film transistor with different modified surfaces is studied. The surface morphology of VOPc films on different modified surfaces were observed through atomic force microscopy (AFM) maps, and the electrical properties of VOPc OTFT were also observed through semiconductor parameter test instrument. The experimental results reveal that the VOPc film on octadecyltrichlorosilane(OTS-18) modified substrate has much larger crystal size and better film than those on octyltrichlorosilane(OTS-8) and phenyltrichlorosilane(PTS). The VOPc TFT with bottom-gate top-contact type on OTS-18 treated substrate has the highest mobility (0.52 cm2/V·s) in the four devices, which is 40 times relative to that on non modified. The interaction force between VOPc and SiO2 can be effectively isolated by the length of alkyl chain, conducive to the formation of large grain size and less film quality defects, the high mobility of TFT device can be achieved. The thickness of the self-assembled monolayer on the insulating layer can significantly affect the growth of VOPc films and the performance of device. This conclusion could be supplied as experiment and theory foundations for the fabrication of high-performance TFT and the growth of organic semiconductor thin film.关键词：self-assembled monolayer;film morphology;VOPc;alkyl chain
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发布时间：2020-08-12 - 摘要：Liquid Crystal Display requires low power consumption, good uniformity of light as a backlight. In order to reduce power consumption and improve the quality of the display image, the future of Liquid Crystal Display backlight needs to realize that time and array can be modulated. Compared with conventional Liquid Crystal Display backlight, zinc oxide field emission backlight has been researched. In this field emission backlight, zinc oxide nanostructure has been taken on as field emission cathode, a planar gate structure to achieve luminance modulation, a metal grid with magnesium secondary electron emitting layer as a focus electrode to achieve uniform illumination. The results showed that a zinc oxide field emission backlight with a focus electrode having a low turn-on field (1.1 V/μm), a relative small voltage modulation range (less than 150 V), a high luminous intensity (greater than 1 000 cd/m2), and the electron focusing structure design would achieve a uniform and stable illumination, which could improve the image quality of the liquid crystal display. With this zinc oxide electron focused field emission backlight, the light emission from backlight could be modulated by time and array independence, while the uniformity of light emission could also be improved, zinc oxide electron focused field emission backlight would be ideal as the LCD backlight.关键词：backlight;zinc oxide;field emission;electron focusing;planar gate electrode
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发布时间：2020-08-12
Device Physics & Device Technology
- 摘要：In order to upgrade the stepping motor controller, the application of S3C2440A in human-computer interaction of stepping motor controller was discussed in detail. The special touch-screen interface and LCD controller in S3C2440A could connect with touch-screen and LCD directly. Based on introducing the architecture of stepping motor controller, circuits among S3C2440A, touch-screen and LCD were given, and related application programming design was analyzed deeply. The information of touched point on touch-screen was sampled by combining interrupting mode and X/Y coordinate sequential conversion mode, meanwhile three-points calibration method was introduced. At last, sampling codes were given. The scheduling, buffer setting and displaying data format of LCD controller were analyzed based on 320×240 TFT LCD. Also, the applied programming codes were given. At last, the above codes were executed in practical system. Result shows that connection between S3C2440A, touch screen and LCD is convenient. So the hardware-design and load of the system could be predigested with this architecture. This system runs well in the application.关键词：human-computer interaction;stepping motor controller;touch-screen;liquid crystal display
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发布时间：2020-08-12 - 摘要：Infrared Touch Screen is the first option for big size touch screen,however, in actual application, there are some general deficiencies like insufficient resolution,low response speed and complicated fabrication and assembling process in mass production. To improve these defects, a design scheme of infrared screen is proposed. In hardware section, the two-dimension strobe infrared scanning circuit, receiving circuit and filtering circuit are incorporated to modularize the transmitting and receiving circuits and facilitate the fabrication and assembling process. In software section, a pulse infrared scanning method is proposed first and the approaches to the pulse scanning based on Timer and ADC built in STM32F205 is also defined, by which the scanning speed of infrared screen is improved. Then the design idea of rescanning is introduced to improve the positioning accuracy of touching point on infrared screen by rescanning without cost increase in hardware.At last, the approaches to HID report descriptor which supports multiple points touching is described to realize the driver-free installation of infrared screen. The actual application proves that the design lessens the fabrication complexity and fulfill the plug-and-play function and effectively improved the definition and response speed of infrared touch screen.关键词：infrared touch screen;two-dimension strobe circuit;pulse scanning;multi-touch
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发布时间：2020-08-12 - 摘要：A high speed and high precision time-interval measurement system based on FPGA and TDC-GP21 was introduced in this paper. The high precision module of TDC-GP21 was used and by configuring TDC-GP21, the time-interval measurement and calibration are finished to improve the precision, and a multi-level FSM were designed to realize the SPI communication and reduce the measurement period. According to the analysis of the factors which affected the precision of measure and the drift error of three discriminators, a discriminator was designed to reduce the nonlinearity error of the system. The signal of FPGA and the signal of laser echo were also used to realize time-interval measurement and laser ranging. The experiment results showed that the good linearity and the measurement repetition rate of 1 kHz and the measuring precision of ±100 ps can be achieved.关键词：time-interval measurement;FPGA;TDC-GP21;high precision;time discriminator
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发布时间：2020-08-12 - 摘要：LED (Light Emitting Diode, LED) source is a field luminescence source light. Video lighting measurement is still in the initial exploration stage although it has gained a wide application. Illumination uneven and light intensity discomfort will affect the quality of images. A digital adjustable even lighter system is designed based on PWM to obtain the high quality images for image measurement of under illumination. This digital adjustable even lighter system can obtain annular LED array, light angle, the number of LED lights, light ring diameter with the orthogonal experiment method. We also build a light source system to gain even lighter among 2 cm view field in the LED circular array. A circuit of PWM pulse generation is designed according to the LED light features to gain an even light of 256 adjustable intensity through the PC software on a variety of different occasion. Four different levels of intensity uniformity is tested in the experiment, and experimental data shows that the intensity uniformity reaches up to 83% at the field at 0.7X and 4.5X using an optical microscopic image, which meets the requirements of the image measurement.关键词：LED;even lighter;orthogonal design;STC89C52;PWM
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发布时间：2020-08-12 - 摘要：In order to meet the need of a high-fidelity and interactivity of tracking radar simulation requirements, this paper sets up a kind of path tracking radar simulation software based on Visual C++.The basic theory, structure design and implementation of the software system are analyzed. According to the statistics results of the radar targets scattering, the paper presents the scattering statistical model containing the target echo model of noise and clutter, builds the aircraft's motion model, and sets up the batch and track filtering algorithm. Then, the simulation system for the functional design and working process is introduced, and emphatically the software implementation to solve the technical difficulties is introduced, including the goal and the mountain shade of judgment and the synthetic technology of the target echo. Finally, this paper presents the main interface and the function window of the simulation system. In general computer the software running results show that the calculating response time is less than 0.1 s, A scope and PPI image update smooth, flicker-free, good portability. The simulation of mountains clutter and targets is vivid, software running is fluent, and has good real-time operation, which indicates that the software system can meet the target detection, noise filtering and path tracking requirements of the path tracking radar.关键词：flight track;radar modeling system;software implement;Kalman filter
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发布时间：2020-08-12 - 摘要：A type of industrial digital camera system based on FPGA is designed because that the traditional one is inflexible and bad real-time. It combines the industrial digital camera and FPGA. The image sensor which acquire the image data is controlled by FPGA through the I2C bus interface. FPGA transforms the Bayer image into RGB image and then stores the image data to DDR2 SDRAM whose interface are designed through Altera IP core-DDRII SDRAM controller with ALTMEMPHY. The image is shown on LCD screen through the SPI bus interface finally. And it can capture 53 frames per second. The system needs about 5 000 logic elements, 3 704 registers and 117 pins. After the code is downloaded to the system chip, the system can clearly display the captured screen. The result shows that the industrial digital camera system based on FPGA has the advantages of flexible design, easy to replant and the ability of high-speed image capture and transmission.关键词：FPGA;image sensor;LCD;DDR2 SDRAM;controller
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发布时间：2020-08-12 - 摘要：To eliminate the impact of chip supply constraint to equipment manufacture, an LCD controller compatible with the original driver is developed based on FPGA, which collaborates with mainstream memory chip of SDRAM, and updates the corresponding hardware circuit of the equipment. The LCD controller employs modularized design, and the system is split into many sub functional blocks such as host interface, memory controller, arbiter, registers, asynchronous FIFO and so on. The sub blocks are modeled with the finite state machine method and programmed with Verilog. Via parameterized configuration, the LCD controller can flexibly support display modes of different resolutions and can effectively meet the requirement of application diversity in the case of keeping original software system untouched. The LCD controller has been tested on demo circuit, and the result shows a stable running, clear image and good visual effect. The practice has proved that the design of the LCD controller is of good configurability, reusability and portability, and can act as an effective solution to similar issues.关键词：FPGA;LCD controller;modularized design;finite state machine
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发布时间：2020-08-12
Driving & Controlling
- 摘要：Image plays a very important role in star sensor. In order to improve the portability of the image acquisition in testing device, the image display and storage system of star sensor based on Gigabit Ethernet is designed and implemented. Image codec is the main parts of the platform, and AX88180 and M88E1111 are taken as critical components. Under the control of the FPGA, images from CameraLink protocol are converted to Gigabit Ethernet, and the PC software collect the original images via Socket and multi-thread technology. Experiment results indicate that the system meets the requirements of the image data transmission rate, and images from star sensor could be displayed and stored conveniently.关键词：star sensor;image;cameralink;gigabit ethernet
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发布时间：2020-08-12 - 摘要：The traditional methods of saliency detection tend to blur the border and internal texture of interested target, which usually destroys the integrity of the target by applying the center-surround diffe-rences. As to this problem, this paper proposes a saliency detection method based on texture inhibition and continuous distribute estimation in order to obtain better saliency detection results. This paper proposes a saliency detection method based on texture inhibition and continuous distribute estimation. Firstly, bilateral filter is used to smooth texture disturbances of the target and background region, while retaining the major edges between the target and background. Then SLIC superpixel image segmentation algorithms are used to divide the pixels into groups which have lots of pixels with the same characteristics. Then features of segment region are extracted by multidimensional normal distribution, and the similarity of feature saliency is calcula-ted by two norm Wasserstein distance. At last, saliency region can be extracted by the local and global saliency detection. The experiment result shows that the experiment method in this paper can extract saliency region effectively. The experiment results show that our method can obtain better detection result.关键词：saliency detection;background prior;Wasserstein distance;normal distribution
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发布时间：2020-08-12 - 摘要：For enhancing fusion accuracy of infrared and visible images, an adaptive fusion algorithm based on local area singular value decomposition (SVD) and pulse coupled neural networks (PCNN) is proposed. Local area singular value decomposition in each source image is done to construct a local structure information index which is served as linking strength of each neuron in PCNN. After the processing of PCNN with the adaptive linking strength, new fire mapping images of source images are obtained, the clear objects of source images are selected by the compare-selection operator with the fire mapping images pixel by pixel and then all of them are merged into a new clear image. Some fusion experiments on several sets of infrared and visible images are done and objective performance assessments are implemented to fusion results. The experimental results indicate that the proposed algorithm performs better in subjective and objective assessments than a few existing typical fusion techniques in the literature and can obtain better fusion performance.关键词：image fusion;singular value decomposition;local structure information index;fire mapping image;linking strength
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发布时间：2020-08-12 - 摘要：In order to pursue a more realistic visual experience and realize the true 3D physical space display, the second generation of solid-state volumetric true 3D display has been developed by Hefei University of Technology. The whole structure and system design was introduced, and the display performance was tested. First, the composition of the display and the role of various parts are introduced, including LED light source, integrator rod, relay system, total internal reflection prisms, Philips prisms, three digital micro-mirror devices, projection lens, folding mirrors, display cube and the control circuits. Then the display cube, light source and circuit system was designed. Finally, the prototype was built and the display performance was tested. The brightness reaches 123 cd/m2 and the color gamut is 78.43% of the NTSC. The images with high brightness, vivid colors and strong stereoscopic impression are displayed.关键词：solid-state volumetric true 3D display;digital micro-mirror device;display luminance;color gamut
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发布时间：2020-08-12 - 摘要：Traditional grayscale-based image edge detection algorithms generally suffer from the disadvantages in weak anti-noise ability, sensitivity to direction and coarse edge details. Based on the analysis of statistics and characteristics of color images, this paper presents a modified algorithm for color image edge detection that combines the Sobel operator and a fast median filtering. By expanding the direction templates of the edge detection operator, the modified algorithm can improve the abilities to adapt the complex texture images and resist strong noises. The modified algorithm is implemented on the Altera DE2-70 FPGA hardware development platform by programming with the Verilog HDL language and the Megafunctions of Quartus II. The experimental results show that the processing of the modified algorithm reasonably takes up only about 2% of system hardware resources to accurately locate the image edges and efficiently extract the edges of color images in real time under strong noises.关键词：edge detection;median filter;Sobel operator;field-programmable gate array;megafunctions
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发布时间：2020-08-12 - 摘要：In order to realize a image steganography with a high hiding capacity and undetectability, based on the fact that the changes in image edges are insensitive to human eyes, a novel adaptive algorithm employing multiple edge detection and Minimum Error Replacement (MER) is presented. By Canny operator, large numbers of edge pixels are picked out and the secret information can be embeded into the edge pixels and common pixels to a certain proportion. To compensate for the resulting decrease in the Peak Signal to Noise Ratio (PSNR), MER method is used. Experimental results indicate that when the Baboon is chosen as cover image and the proportion of embedding the secret information is 4:1, the hiding capacity is 525 612 bit and PSNR is 41.3 dB. This algorithm not only has a high hiding capacity and good visual qualities, but also easy to carry out.关键词：edge detection;minimum error replacement;adaptive;steganography;Canny operator
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发布时间：2020-08-12 - 摘要：As the brain is complicated, which has precision texture, and imaging technologies is limited, there will be an over segmentation issue if the traditional watershed algorithm is used to segment brain tumor. As a matter of method, some pre-processing is proposed before applying the watershed segmentation: firstly, morphological opening and closing reconstruction is used to reconstruct the original image and to filter the noise and fine texture; secondly, the multi-scale morphological gradient is used in the reconstructed image, and the watershed segmentation algorithm is used in the gradient image of modified marker. Experiments results indicate that the tumor can be separated completely when structural element radius size is used from 17 to 22. Compared with the traditional watershed segmentation algorithm, this method alleviates the over segmentation problem, and tumor can be separated easily from the original image.关键词：watershed;over segmentation;morphological opening and closing reconstruction;multi-scale morphological gradient;marker
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发布时间：2020-08-12 - 摘要：Anti-aliasing of the triangle rasterization whose edge has ladder phenomenon obviously is proposed in this paper. The method of adding interpolation points outer the horizontal and the method of anti-aliasing line unilateral are discussed, based on Wu anti-aliasing algorithm. The advantages of both methods are considered in order to draw triangle rasterization. Wu anti-aliasing line is overlaid for the edge at the same time. And the gray value of background pixel is under consideration. The result shows that the improved edge anti-aliasing algorithm of triangle rasterization effectively improves the display of the triangle rasterization edge. The principle is simple and it is easy to implement on FPGA. Therefore the improved algorithm can be applied to cockpit display system which needs high display quality urgently.关键词：anti-aliasing;Wu algorithm;rasterization;FPGA
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发布时间：2020-08-12 - 摘要：An adaptive watermarking algorithm based on computer generated holography with strong robustness is proposed. Firstly, two original watermarks are converted to holograms using the computer generated holography by the conjugate-symmetric extension. And the holograms are encrypted by the pre-process method. Then, the original image is decomposed into two pyramidal levels by Contourlet transform, and the intermediate frequency is transformed into eight directional subbands. Finally, encrypted holograms are embedded into the directional subbands adaptively. Experiments demonstrate that the PSNR of watermarked image is 38.385 7 dB. The extracted watermarks can be well recognized when JPEG compression quality factor is bigger than 30 and cropping part is less than 30%. The proposed method also can well resist attacks such as Gaussian noise, salt & pepper noise, speckle noise, Gaussian filtering, median filtering and average filtering. And the watermarks extracted from print-scan experiment can be well recognized. In the phase of watermark extraction, original image is not needed. The watermarking technology proposed can be widely used in copyright protection of digital and printed images.关键词：computer generated hologram;adaptive watermarking;Contourlet transform;copyright protection
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发布时间：2020-08-12
Imaging Technology & Image Processing
- 摘要：Based on virtual instrument technique, in order to realize measuring Stribeck friction toque of servo turning table on optoelectronic device, a kind of Stribeck friction measuring system was developed using NI USB-4431 Data Acquisition Card. Using Labview to control USB-4431 Data Acquisition Card,this system can realize the collection,display,save and analysis of physical data, including velocity, acceleration and current. The experiment is carried out on the azimuthal servo turning table of T type support,the parameters of max friction,coulomb friction, critical velocity, viscous friction were obtained. The experiment verified that the correlation coefficients between simulation and experi ment velocity can reach to 0.99 under sine guide when the friction model was used. The system provided friendly human-computer interface,it can realized on-line display and measurement,it also provided plentiful ports. The function of the system can expanded for other use.关键词：Labview;virtual instrument;friction measuring;servo turning table;display
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发布时间：2020-08-12
Measurement Technology
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