最新刊期
期 2 ， 2015
- 摘要：Degradation behaviors and degradation mechanisms of bridged-grain (BG) polycrystalline silicon thin film transistors (TFTs) under DC bias stresses are studied and investigated. Compared to normal poly-Si TFTs, BG poly-Si TFTs exhibits better negative bias temperature instability (NBTI), better self-heating (SH) reliability and better hot carrier (HC) reliability. All these DC reliability improvements come from BG lines inside the active channel. By selectively doping the active channel in BG poly-Si TFTs, boron-hydrogen bonds formation at oxide/channel interface and grain boundaries, Joule heat diffusion enhancement at channel length direction and lateral electric field reduction at the drain side are respectively responsible for the improved NBTI reliability, SH reliability and HC reliability. All test results indicate that such high performance and high reliable BG poly-Si TFTs have great potential in system-on-panel applications.关键词：bridged-grain;polycrystalline silicon;thin film transistors;negative bias temperature instability;self-heating;hot carrier
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发布时间：2020-08-12
Invited Paper
- 摘要：A binary mixture of two different cross-like molecules is considered. Supposing a simple interaction model between molecules, and using mean field approximation, phase diagrams in the plane of molecular structure parameter rA(the length ratio of short and long rods of A type molecule) and reduced temperature t are obtained. The results show there exists a Landau point, through which the binary mixture can enter directly from isotropic phase to biaxial nematic phase. The optimal molecular structure at this point depends on the structures, the number ratio of A and B type molecules. Mixing rod-like and plate-like molecules with equal numbers will lead to this optimal structure. When rB, the length ratio of short and long rods of B type molecules increases, the rA value at Landau point decreases. Comparing the free energy curves corresponding to mixed system and phase separated system completely, it is found that by increasing the interaction strength between different types of molecules, increasing temperature, decreasing the structural difference between different molecules, the chance of phase separation will be reduced.关键词：binary mixture;biaxial nematic;phase transition
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发布时间：2020-08-12 - 摘要：By analyzing massive display inconformity samples, the direct cause and the root cause of display inconformity were found, and on this basis, experiments were designed to improve the display inconformity defect. The analysis indicated that the direct cause of display inconformity was the position shift of pillar spacer caused by gravity; and the root cause was that the size of pillar spacer was too small, so there was no metal line around the pillar spacer which could prevent the pillar spacer from position shift. The result of experiments showed that transport panel by putting it in box, or reducing the duration while panel was put in cassette could obviously improve display inconformity, but were not suitable for production. Furthermore, increasing the size of pillar spacer, so as to decrease the space around pillar spacer could effectively improve the display inconformity defect at the source. By increasing the size of pillar spacer from 15 μm to 23 μm, the defect grade of display inconformity was reduced from Level 4 to Level 2.5, and the display inconformity defect was greatly improved.关键词：large size;display inconformity;pillar spacer;panel
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发布时间：2020-08-12 - 摘要：In order to reduce the power consumption of liquid crystal displays (LCD), the Ag nanowires-liquid crystal composites were prepared. Twisted nematic (TN) liquid crystal mode cells doped with Ag nanowires of 50 nm diameters and different concentrations were prepared. The effects of Ag nanowires on the driving voltage, response time and frequency modulation of TN LCD mode cells were investigated. It was found that the addition of Ag nanowires decreased the driving voltage remarkably, and the threshold voltage can be reduced by 14% at most. The field on response time (Ton) of TN LCD mode cells doped with Ag nanowires was higher than those of pure TN LCD mode cells. Furthermore, strong frequency modulation response of the electro-optical characteristics was also found in Ag nanowires doped TN LCDs. The doping of Ag nanowires into LC host improved the electro-optical characteristics of TN LCDs effectively.关键词：liquid crystal display;Ag nanowire;threshold voltage;response time;frequency modulation
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发布时间：2020-08-12 - 摘要：Within the Landau-de Gennes theory, the order reconstruction of s =±1/2 twist disclinations in a twisted nematic cell is investigated, using the two-dimensional relaxation iterative method. The biaxial structure of the defect core as the cell gap decreasing is explored. At a critical value of dc* ≈ 9ξ (here ξ is the characteristic length for order-parameter changes), the exchange solution is stable, while the defect core solution becomes metastable, where the system starts to stretch the defect structure and the biaxiality starts to propagate inside of the cell. Comparing to the case with no initial disclination, the value at which the exchange solution becomes stable increases relatively. At a critical separation of dc ≈ 7ξ, the system undergoes a biaxial transition, and the defect core merges into a biaxial wall with large biaxiality. The force reaches a maximum at d≈ 9ξ, and a local minimum at d≈ 7ξ. For weak anchoring boundary conditions, because of the weakened frustration, the asymmetric boundary conditions repel the defect to the weak anchoring boundary as the anchoring strength coefficient decreasing.关键词：order reconstruction;twist disclination line;biaxial parameter;Landau-de Gennes theory
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发布时间：2020-08-12 - 摘要：Recently, liquid crystal (LC) lens has been highly developed and widely used in many areas, especially in the 3D display. In order to get higher optical efficiency and faster response time, the LC mixtures should have some obvious advantages such as high birefringence, low rotaional viscosity, high Δε and K33/K11. In this paper, the isothiocyanate compounds was introduced to the LC mixtures used in LC-lens, getting higher birefringence, lower rotaional viscosity, high Δε and K33/K11.关键词：liquid crystal lens;high birefringence;isothiocyanate compounds
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发布时间：2020-08-12 - 摘要：The ultrasonic effect on the lyotropic chiral nematic liquid crystal(N*-LC) of cellulose nanocrystal(CNC) and optical properties of the solid N*-LC film were investigated by using polarized light microscopy(POM), UV-visible spectroscopy(UV-vis), X-ray diffraction(XRD) analysis, and electric conductivity, etc. It is found that the pitch of the N*-LC was stretched with the increase of the ultrasonic power. The reflection wave length of the N*-LC solid film was red-shifted with the increase of the ultrasonic power. The amplitude of the red-shift of reflection wave length depended on the applied ultrasonic power. The conductivity of the lyotropic N*-LC increased after ultrasound treatment. As a consequence, it is speculated that the high power ultrasonic treatment releases some of the ions trapped in the bounded electric double layer on the surface of CNC particles,which make the electrostatic repulsion between CNC increasing. So the increase in the repulsion force resulted in a larger pitch and a red-shift of the iridescence wavelength of the resulting solid film.关键词：cellulose nanocrystal;chiral nematic liquid crystal;ultrasonic treatment;pitch
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发布时间：2020-08-12 - 摘要：Based on the concept of local resonance, a kind of tunable broadband sound absorption metamaterial consisting of helmholtz resonator (HR) with negative modulus was designed. The resonant frequency of the metamaterial can be tuned by changing the bore diameter drilled in the HR. The transmission curve of the metamaterial was simulated by using COMSOL Multiphysics, and then the modulus of the metamaterial can be obtained via extraction method. Simulation results confirm that the present metamaterial can accomplish negative modulus at the resonant frequency, simultaneously showing excellent property of sound absorption. A kind of metamaterial with broadband sound absorption from 970 to 1 300 Hz was constructed by periodically arraying two layers of HRs. Excellent sound absorption appears in the sound absorption band with minimum transmission -22 dB. Metamaterial with any wanted bandwidth of negative modulus and sound absorption in audio-frequency range can be obtained by periodically arraying multilayers of HRs with different resonant frequencies. It is expected that the proposed metamaterial will significantly contribute to the design of broadband negative modulus and sound absorption metamaterial.关键词：helmholtz resonator;broadband;negative modulus;sound absorption;metamaterial
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：Blue phosphorescent organic light emitting diodes were prepared with small molecule SimCP as the host material and the iridium complex FIrpic as the guest by solution method. The effects on luminous efficiency and spectral characteristic of these diodes were analyzed from solvent and the doping concentration of FIrpic. The results show that choosing chlorobenzene as solvent which has high boiling point and low volatility could reduce the turn-on voltage to 6 V, and the location of the emission spectrum peak shifted from 492 nm to 468 nm. The smaller FIrpic doping ratio was in the emission layer, the more the emission intensity at 492 nm reduced, while the main peak 468 nm had a relative enhancement. What's more, the concentration was too small to transfer energy sufficiently, and a new emission peak at 400 nm appeared. When the concentration was too large, it would cause concentration quenching. In the essay, when the ratio of SimCP:FIrpic was 12:1, the device got better performance. The turn-on voltage was 4.2 V, and the maximum brightness was 3 060 cd/m2.关键词：SimCP;FIrpic;solvents;the doping concentration
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发布时间：2020-08-12 - 摘要：In order to meet the requirements of the market for high resolution display products, the design and process technologies of products should be optimized. The most important factors affecting the product characteristics are the size of through-hole and line width. This article explains how to control the exact size of the tiny hole by using phase shift mask technology. By adding a phase shift layer with a certain thickness and transmittance onto the usual through-hole, the light transmittance of tiny hole is analyzed under different parameters. It can be obtained the relation between the transmittance and parameter of phase shift layer, and it can infer a control solution to get a tiny hole with stable size. The results show that, by the control of transmittance and the width of the phase shift layer, a stable size of tiny hole can be obtained with the property of insensitive to the exposure dose. When the exposure dose doubled or even several times in the process, the tiny hole size remains a stabilized value. It means a higher process tolerance. The size of the tiny hole could even be less than the device's resolution limit (4 μm). By reducing the size of through-hole, we can effectively increase the aperture ratio of TFT products and get higher PPI(pixel per inch)products.关键词：TFT LCD;through-hole;high PPI
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发布时间：2020-08-12 - 摘要：Based on the principle of stressed liquid crystal, re-exposal method is used during the phase separation by UV curing, and vertical stretched force is applied in the second exposure process. The reverse mode electronic controlled switchable glass samples of polymer dispersed negative liquid crystal by stress inducing vertical directional polymerization are prepared. The sample has the properties of reverse mode piezo-optical effect and reverse mode electronic controlled switchable glass. The sample is translucent and the transmittance is nearly 30%. When compress force or electronic field is applied, the sample turns to scattering opaque state and the haze is above 90%. The research on reverse mode electronic controlled switchable glass is a difficult problem in the switchable glass field. Preparing the sample by stressed liquid crystal technique has a certain significance in research and application of liquid crystal electro-optic device.关键词：stressed liquid crystals;stretched liquid crystals;negative liquid crystals;reverse mode electronic controlled switchable glass
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发布时间：2020-08-12 - 摘要：Mura is a common defect which degrades display quality greatly in TFT-LCD process. Sand Mura was studied in this paper which happened in a new product development, and the experiments were carried out by Macroscopic and Microscopic Inspection(M/M), Scanning Electron Microscope(SEM), Focused Ion beam(FIB) and so on. Experimental results show that the pixel electrode ITO open happened in the over wet etch process is the root cause of Sand Mura defect, and it also lead to liquid crystal molecules deflected exception, therefore, the light was shielded and dark spots were generated; By adjusting the thickness of pixel electrode ITO film, etch time and other measures, pixel electrode open can be avoid which is related to the over etch in the PVX hole, the defect ratio of Sand Mura can be reduce to 0.3% and the display quality of product was effectively improved. In addition, the optimizing via design scheme and above mentioned results provide valuable data and theory basis for related issues in the development stage of new product.关键词：TFT-LCD;Sand Mura;over etch;thickness;etch time
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发布时间：2020-08-12
Device Physics & Device Technology
- 摘要：The display-body used in Solid Volumetric True 3D Display contains 20 pieces of Liquid Crystal Light Valve(LCLV). The high-speed video projector projects a sequence of pictures into different pieces of liquid crystal light valve so that people can see a true 3D image. It's necessary to synchronize the display body with the high-speed video projector. First, a circuit driver for large-size liquid crystal light valve is needed. The driver should have the strong capability of fast response and can realize bipolar drive. After solving the problem caused by the oscillation happened on the gate of MOSFET, the circuit driver for the display-body is designed. Finally, after analyzing the reasons of flicker happened when the body refresh rate is 60 Hz, a new method based on current hardware is given to solve the problem of flicker. Experiments show that the driver can realize the true 3D display without flicker. To one piece of liquid crystal light valve 48 cm(19 in), the sum of rising time and falling time is 0.5 ms when the drive voltage is 100 V. The circuit driver can realize the function and provides a method for driving the liquid crystal light valve in large size.关键词：true 3D display;stereo display;liquid crystal light valve;bipolar drive;flicker
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发布时间：2020-08-12 - 摘要：In order to miniaturize and integrate Camera Link camera, an output-encoding function based on Camera Link interface was designed and implemented. The implementation is divided into three steps: firstly, mapping image pixel data to the Camera Link PORT; secondly, encoding the PORT data and synchronous clock signal according to the data coding requirements of DS90CR287; finally, completing the LVDS output which contains the image data and clock signal through FIFO and parallel-to-serial conversion module. The BASE model that the pixel clock is 40 MHz was emulated using ModelSim, at the same time, the FULL model that the pixel clock is 40 MHz was experimented. The experimental results demonstrate the correctness and feasibility of the Camera Link output encoding scheme. The proposed coding scheme is stable and reliable, it can be used in different modes, with high flexibility and practicability.关键词：output encoding;camera link;FPGA;video camera
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发布时间：2020-08-12 - 摘要：In order to test the function and performance of the electronic control unit of lunar-based extreme ultraviolet camera, a test system based on FPGA is designed. This system adopts FPGA as processing and control core. The system uses the communication with the computer through USB bus. And it can analyse remote data and image data which are collected by external interface of electronic control unit. Therefore, this system can complete the test of each function and each performance of the electronic unit. The result of the testing experiment of lunar-based extreme ultraviolet camera control unit and test system shows that test method of the system is accurate, and the test results are correct and effective.Because it has been fully used during the development of extreme ultraviolet camera, this test system played a great important role on the smooth degree of designing process in the program, which has the features of practical, efficient and portable.关键词：extreme ultraviolet camera;test system;electronic control unit;FPGA
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发布时间：2020-08-12 - 摘要：In order to reduce the human disturbance for blood analysis results, an automatic blood type image recognition system is established, and the system's hardware and software recognition algorithm is researched. The hardware of the system consists of a DSP chip, a SDRAM chip, a FLASH chip, an image coding chip, an image decoding chip, a U disk/SD card control chip, et al. The software recognition algorithm consists of gray-scale transformation, smoothing filtering, template matching, threshold processing, color component extraction, et al. Experimental results indicate that the software recognition algorithm can segment the micro-tubular from the blood card and recognize the red blood cell distribution effectively. In addition, the blood card's type can be differentiated through the color difference effectively. This system can meet the basic requirement of blood type image's automatic recognition.关键词：blood analysis;DSP;template matching;threshold processing;color component
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发布时间：2020-08-12 - 摘要：The word stock of μC/GUI takes up too much space but the storage space of MCU is limited. In order to solve this contradiction, the method to realize the external Chinese word stock of μC/GUI is explored. The scheme storing the word stock in the external spi flash chip is put forward. And this scheme supports the Chinese for μC/GUI more comprehensive and more complete. First, the data structure related to Chinese character's storage are studied. The driver program of the spi flash is written and the word stock file is stored in the external flash chip through the PC serial port software and serial port interrupt handler. Then, the kernel functions related to the character display is modified to judge the character properties, thus making μC/GUI support the external Chinese word stock based on storing the word stock in the flash chip successfully. Results of the trial indicates that the Chinese character stored in the external chip can be displayed on the ILI9320 LCD and the word stock stored in the external chip can be called and displayed by the μC/GUI normally. Storing the word stock in the external spi flash chip saves the MCU space and possesses favorable commonality and flexibility.关键词：μC/GUI;graphical interface;spi flash;external word stock
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发布时间：2020-08-12 - 摘要：The conventional calculation principle for the feed through voltage relates to capacitance values of OLED body, and capacitance values of different OLED products is variable. A lot of experiments must be done by testing department of OLED manufacturing enterprise in order to get the best capacitance values of OLED body. This paper directly pulls up gate voltage, and then the storage capacitor of OLED body produces a feed through voltage to compensate the feed through voltage generated by the parasitic capacitance between the gate and the drain as the gate voltage closing. Experiment result shows that the total detection rate using the testing waveform based on automatic compensation principle or conventional compensation is consistent, and there is little difference on the detection rate of different defects.关键词：OLED;electrical performance testing;testing waveform;voltage compensation
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发布时间：2020-08-12
Driving & Controlling
- 摘要：In order to improve the output quality of visible light sensor in low-light environment, an adaptive image enhancement algorithm using Gaussian mixture modeling is proposed in this paper. The histogram of image is modeled with Gaussian mixture modeling and the improved EM algorithm is used to fit the histogram and get the best parameters. Then, the histogram is separated into sub-histograms based on the intersections of Gaussian components. Finally, the mapping is achieved according to the parameters of output image, and the final enhanced image is obtained by the maximum entropy preserving method which tends to the characteristics of human visual. The experimental results show that the algorithm can determine the optimal number of clusters adaptively and improve the speed of the histogram fitting which costs 0.37 s averagely. Comparing with traditional methods, the enhancement result is superior in terms of objective evaluations of related information entropy and texture information. It can improve the contrast of the low light level image and maintain the details.关键词：image enhancement;histogram;Gaussian mixture model;low light level image
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发布时间：2020-08-12 - 摘要：In the traditional anisotropic diffusion algorithm, for the result of the smoothing effect of diffusion coefficient function is not good, the value of diffusion threshold K relying on the experience and the protection of image details is inadequate in the diffusion process. To solve above problems, an improved anisotropic diffusion algorithm is put forward. First, several current typical anisotropic diffusion denoising algorithms are introduced. Then, an improved diffusion model which based on adaptive median filtering is put forward on the basis of typical algorithm analysis. And then, an improved diffusion coefficient function in improved diffusion model is put forward according to three conditions which the diffusion coefficient function should satisfy and the classical diffusion coefficient function. Finally, a method of adaptive selection of the diffusion threshold K is put forward. The algorithm removes noise in ultrasound images by using the improved diffusion coefficient function in the modified diffusion model and combining adaptive selection of the diffusion threshold. The experimental results show that the proposed algorithm outperforms the PM model, Catte model,the Wang Changhong algorithm etc. The FOM value of the denoised image is 3.34% higher than that of the PM model and PSNR value is 0.250 6 higher than the PM model. The algorithm effectively removes speckle noise and at the same time protects image details and edges effectively and it contributes to accurate diagnose of the diseased area for medical personnel.关键词：anisotropic diffusion;adaptive median filtering;diffusion coefficient;diffusion threshold;ultrasound image
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发布时间：2020-08-12 - 摘要：This paper proposes a new algorithm composed of weighted multi-scale structural similarity (WWMS-SSIM) based on wavelet decomposition and HVS property. Wavelet decomposition is performed for the original and distorted images, respectively. Each image can be partitioned into one low-frequency subband (LL) and a series of octave high-pass subbands (HL, LH and HH). Different subbands are processed with different weighting factors. Based on the results of the above, modified WWMS-SSIM can be construced. In terms of experiment results,the new algorithm shows good feasibility comparing with MSE,PSNR,SSIM and improved SSIM image quality assessment methods.
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发布时间：2020-08-12 - 摘要：Aiming at the problem of the high dimension features and complicated training in image universal steganalysis technology, this paper proposes a steganalysis method based on ensemble classifier. The method designs a ensemble classifier which combines the difference of base classifier and weighted fusion. Specifically, the algorithm uses CC-PEV as steganalysis features. Then, the method randomly structures several feature subspace, uses the bootstrap method to construct image training subsets, and train them to get a number of base classifiers. Finally, every base classifier is given weight that different from each other according to the classification result and then the final forecast is got after the combination of classification results with their respective weight. The experimental results show that using ensemble classifier for training and giving base classifiers with different weights fusion could effectively improve the accuracy of the algorithm.关键词：steganalysis;integration;classifier;weights
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发布时间：2020-08-12 - 摘要：In order to deal with the complicated field environmental conditions that real-time video image process systems have to confront, a general-purpose real-time video image process system is designed, which is extendable and can be applied to multiple field environmental conditions simultaneously. Image process systems based on FPGA+DSP architecture are widely used in the field of image process, because the DSP processor is of high calculating performance and the FPGA is of high real-time performance, while the Compact-PCI bus is extendable because its interface with the computer is already standardized. Combining both advantages, a new general-purpose video image process system is designed based on Compact-PCI bus and FPGA+DSP architecture. Hardware experiments show that, this system can be equal to capturing and processing video images of 320×256~1 024×1 024 pixels,8~14 bits and maximum frequency of 100 Hz real-timely. Besides, it can also realize real-time control by means of the Compact-PCI bus, of which the result is pretty good. It indicates that this system is capable of dealing with complicated environment, such as infrared and visible scenes. It is real-time and effective. It provides a new possible solution to video image capture and process.关键词：video image process;real-time;FPGA;DSP;Compact-PCI bus
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发布时间：2020-08-12 - 摘要：Medical images are usually polluted by noise during the process of transmission and collection. A mixed noise removing method based on adaptive three-dimensional (3D) fractional integral and median filtering was proposed to reconstruct high accuracy edge surfaces. Firstly, some traditional methods in denoising were introduced. Then the adaptive order of fractional integral based on the gradient information of three-dimensional image was proposed. Making use of the advantage of fractional integral and median filtering, an edge surface tracking algorithm based on mixed noise denoising method was proposed. The experimental results show that the proposed method can effectively track edge surfaces from noisy medical image slices with high accuracy. The denoised results are better than traditional denoising methods.关键词：medical image;mixed noise;adaptive 3D fractional integral;median filtering;denoising
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发布时间：2020-08-12 - 摘要：To solve the problem of lacking cooperation targets in the army's dairy training of the photoelectric device, a generating algorithm of the dummy tracking image is presented based on the computer's processing. This algorithm can generate the tracking image of the dummy target according to the theoretical trajectory, the prototype, the characteristic parameters and the three view of target, and also integrating the information of rotation position for the photoelectric device. The results show that the algorithm can effectively solve the army's training problem, which can make the operator manipulate the device on the basis of the dummy tracking image to complete the dairy training. At the same time, the algorithm has been optimized to improve the computer efficiency, which the working time is about 5~6 ms to generate the dummy tracking image for a standard PAL type analog image with 25 Hz cycle. By analyzing of the result, the precision of tracking image is about 1″and measure up for the army's dairy training.关键词：dummy target;tracking image;photoelectric device;simulation training
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发布时间：2020-08-12 - 摘要：On the basis of Criminisi algorithmic framework, a fast Criminisi image inpainting based on firefly algorithm(FA) is proposed for the deficiencies of the priority and the best match template. Firstly, normalization function is introduced to the confidence to improve the reliability of the priority. Then, in order to improve and reduce error rate, FA which can combines global search and local search effectively is introduced to search the best template. Experimental results show that on the basis of guarantee the quality of image inpaiting, the improved algorithm can reduce the cost and improve efficiency.关键词：criminisi algorithm;the priority;the best template;FA
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发布时间：2020-08-12 - 摘要：In order to eliminate disturbing speckle phenomenon, this paper discussed the feasibility of speckle reduction,analyzed the superiority in beam control and energy efficiency using the "random micro-lens array" as the random diffuser, and proposed to set the rotating "random micro-lens array" in the optical system to reduce the speckle. The speckle on the screen was measured after setting this component, this method was verified to reduce speckle contrast to 1.15% so that the eyes couldn't distinguish the laser speckle. This method can greatly improve the viewing quality of laser TV. Compared with traditional method of rotating uniform light stick, this method presented the excellent ability in speckle reduction.关键词：speckle reduction;random micro-lens array;laser display;speckle measurement
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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：Based on the theory of colorimetry, brightness and coverage of color gamut of laser and LED hybrid projection sources were measured and analyzed. Compared with the traditional ultra-high-pressure mercury arc lamp, the new projection sources possessed higher brightness. The brightness had no obvious attenuation after using for a long time. The coverage of color gamut was more colser to the human's eye. Meanwhile, the color performace was still further abundant, which met the projection display requirements of high brightness and high color reproduction capability.关键词：colorimetric properties;projection display;projection light source;laser;LED
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发布时间：2020-08-12
Imaging Technology & Image Processing
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