最新刊期
期 6 ， 2012
- 摘要：Blue phase liquid crystals (BPLCs) show fast response time and macroscopic optical isotropy due to their double twist cylinder structure. With polymer stabilization, the thermal stability of BPLCs can be improved dramatically. However, it induces some problems to the electro-optic properties of BPLCs material such as high driving voltage, hysteresis and so on. In this paper, different concentrations of chiral dopant, polymer network of the BPLC, and temperature effect are investigated to improve the electro-optic properties of BPLCs and analyze the mechanism that affect the electro-optic properties of the BPLCs device.关键词：blue phase liquid crystals;Chiral dopant;Kerr constant;hysteresis
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发布时间：2020-08-12 - 摘要：The chiral dopant ISBB with large helical twist power was synthesized. Temperature gradient across the liquid crystal layer was formed by imposing different temperature on 60.0 μm ISBB/photo-polymerizable liquid crystalline monomer/nematic liquid crystal/photoinitiator composite layer's upper and lower surfaces. Because high temperature region could dissolve more ISBB than low temperature region, ISBB would diffuse from low tempe-rature region to high temperature region, then ISBB concentration gradient and pitch gra-dient was formed across the composite layer. After irradiating the layer with ultraviolet light, crosslinking between the photo-polymerizable monomers occurred and the pitch gra-dient was fixed. Finally, a broadband reflection liquid crystalline film which could reflect light circularly polarized visible light was prepared.关键词：liquid crystal;chiral;broadband reflection;temperature gradient
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发布时间：2020-08-12 - 摘要：To achieve the high accuracy correction of the distorted wavefront, dynamic phase response characteristic between different grey levels of liquid crystal wavefront correctors (LC WFCs) was investigated. First, a scheme was given to measure the response time and phase modulation of the LC WFC. Then, the fall and rise time of a LC WFC were measured between 0 and 255 grey levels. The results indicate the rise and fall time are 7 ms and 11 ms respectively. To assure the correction accuracy, the phase modulation curves were cut off with error of λ/10 (λ=633 nm) and then the rise and fall time were reduced to 4 ms and 6.8 ms respectively. At last, the dynamic response time, which is produced with every other grey levels go up to 255 grey level and the reverse process, was measured. The measured results show that the rise and fall time of the grey levels vary at the range of 2~5.2 ms and 3.7~8.7 ms respectively. Simultaneously, the switching time between the grey level of 150 and 255 is shortest for both of the rise and fall time, and the response time is longest for the grey levels which is adjacent to 255 grey level. Furthermore, the response time of the grey levels nearby 255 grey level is larger than the response time between 0 and 255 grey level. Therefore, to assure the accurate correction of the wavefront, the response time of the LC WFC should be selected with the longest switch time among the grey levels which is adjacent to 255 grey level.关键词：liquid crystal wavefront corrector;phase;response time;Dynamic
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发布时间：2020-08-12 - 摘要：The polymer dispersed liquid crystal (PDLC) films were prepared by photopolymerization induced phase separation with macroinitiator (RAFT-PS) of different molecular weight, synthesized by RAFT polymerization. The influences of molecular weight of RAFT-PS on morphology, photopolymerization kinetics, nematic fraction and electro-optical pro-perties of PDLCs had been investigated. It was found that the key factor of affecting morphology was not the molecular weight of polymer matrix and the rate of polymerization but the molecular weight of RAFT-PS. On the other hand, the diameter of liquid crystal droplets was effectively controlled by changing the molecular weight of RAFT-PS. This result contributed to improve electro-optical properties of PDLCs.关键词：molecular weight of macroinitiator;morphology;electro-optical properties;polymer dispersed liquid crystal
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发布时间：2020-08-12 - 摘要：The theoretical internal quantum efficiency of Re(Ⅰ) complexes is 100%, which is three times higher than that of fluorescence materials. The high quantum efficiency is attri-buted to the strong spin-orbit coupling of the heavy metal rhenium. Re(Ⅰ) complexes have the desirable properties including relatively short excited state lifetime, high phosphorescence quantum yield at room temperature, outstanding thermal stability and chemical stability. This review sketches the development of Re(Ⅰ) complexes in OLEDs which have been published. It also prospects the molecular designing and potential application future in OLEDs of Re(Ⅰ) complexes.关键词：Re(Ⅰ) complexes;electroluminescent;device
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：Polymer-stabilized blue phase liquid crystals (PSBPLC) within wide temperature range attract many attentions, such as fast response time short as sub-millisecond, alignment-free and polarization independent. It has potential huge application for PSBPLC both in display technology and optical-electronic devices. The micro phase model and Kerr effect for PSBPLC were described.This paper introduced for PSBPLC development in microlens technology including main kinds of microlens structures such as BPLC microlens with hole pattern, adaptive BPLC microlens with curved electrode, BPLC GRIN microlens, BPLC microlens with resistive film and BPLC microlens with ZnO nano-rod electrode.关键词：polymer-stabilized blue phase liquid crystals;kerr effect;microlens
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发布时间：2020-08-12 - 摘要：The principle of autostereoscopic front projection display based on micro-lenticular lens array is introduced. Formulas to determine the parameters of the micro-lenticular lens are deduced and a method to design the micro-lenticular lens array is proposed. A piece of stereoscopic projection screen is designed based on the method and the whole projection system with the screen is emulated in Lighttools. The simulation result shows that there are five definite viewing zones. The distance of the adjacent viewing zone is very close to each other. The projection system is built up and the observe plane is at the vertical plane with the projectors. The crosstalk is 7.9% and overlap ratio is 1.008. The final result is consistent with the simulation result and the autostereoscopic display effect is good. The experimental results show that the autostereoscopic front projection display based on micro-lenticular lens is feasible. Compared to autostereoscopic rear projection, the autostereoscopic front projection display has the advantages of simple implementing, compact structure and adjustable projection distance, therefore it will be an important developing direction of large screen 3D display in the future.关键词：micro-lenticular lens;autostereoscopic display;front projection
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发布时间：2020-08-12 - 摘要：Aerosol jet printing is a new printing technique developed in recent years. Film forming on the substrate is achieved with the jet printing of the ink aerosol stream. This enables the aerosol jet printing to realize high-resolution printing with wide-range inks of different viscosity. The working mechanism, the application in the fabrication of organic devices, and the future of the aerosol jet printing are reviewed and envisioned.关键词：jet printing;organic material;aerosol;optoelectronic device
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发布时间：2020-08-12 - 摘要：The dependence of Zara domain(corner) on LC pattern has been studied.The experimental results show that,when no LC drop in the corner of LC pattern,Zara domain (corner) easily occurs.By adding LC drop in the corner of LC pattern,the incidence of Zara domain(corner)can be reduced.By adjusting the distance to Active Area,the incidence of Zara domain (corner) is the lowest. On the conditions for LC Pattern 5, Zara domain(corner) is 2.5%,and then disappears after oven treatment.关键词：LCD;Zara Domain;liquid crystal pattern
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发布时间：2020-08-12 - 摘要：Currently,more and more liquid crystal displays are towards to the low-power, which the effective method is reducing the number of LEDs as the light source. However, as the decrease of LED pixel, hot spot will increase fast. To solve above problem, without changing the distance between LED and guide plate, and with increasing the distance between LED and LED as well as incident angles of guide light plate, light in guide light plat is completely mixed by using this method, and light uniformity is much more improved. Hot spot in the LED backlight module are also solved. This research has good significance for LCD display.关键词：LED;uniformity
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发布时间：2020-08-12
Device Physics & Device Technology
- 摘要：A Solar power controller is designed based on High Stability Microcontroller PIC18F97J60. The controller uses a serial SPI LCD as the display interface, the solar cell voltage and output current, load electricity consumption and the controller running state are displayed in the LCD screen. The controller can communicate with the host computer through an Ethernet. The hardware structure and software flow design of the Solar power controller has been given. The experiment proved that LCD module has the advantages of simple structure, strong anti-interference ability, better stability, and satisfied the requirement of real-time display of the solar power controller.关键词：PIC18F97J60;LCD module;solar power controller;SPI interface
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发布时间：2020-08-12 - 摘要：A dual-gate + Z-inversion (DZi) driving method was proposed to reduce power consumption of thin-film transistor liquid crystal display (TFT-LCD). The power saving principle of DZi driving was researched, the structure design and circuit design were finished, 35.6 cm(14 in) WXGA (1 366 RGB?768) samples were manufactured, and the power saving effect was measured and analyzed. As results, DZi can save TFT-LCD power consumption in effect, such as panel AVDDS power reduces 70% (191 mW) when display color-bar pattern. Moir? phenomenon that appeared in DZi module was analyzed, and solutions were proposed. The research established a driving method and design reference for lower power consumption in TFT-LCDs and other displays.关键词：TFT-LCD;low power consumption;driving;dual-gate+Z-inversion;Moir? phenomenon
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发布时间：2020-08-12 - 摘要：In order to realize the speediness display collected by the area array CCD, a fast display system based on field-programmable gate array (FPGA) is presented. Using FPGA to build-up soft core processor and using appropriative IC module AD9929 as the driver processing chip of CCD, and then it designs the driver circuit according to the interface time order of TFT liquid crystal screen and chip AD9929. Finally, the speediness display of collected data can be realized through DMA technique. The testing results of circuit show that this method can make the collected data by area CCD rapidly display on the TFT liquid crystal screen, which has wide applications in the industrial field surveillance.关键词：CCD digital cameras;FPGA;TFT liquid crystal screen
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发布时间：2020-08-12 - 摘要：In order to meet the needs on reliability and stability for aerospace encode, the display module in the debugging system of space encoder was designed. The singlechip 80C32E was the core processor to achieve the collection,processing and display. In the display module, the angle information of binary form was displayed by LED bars on the one hand, the angle information of degrees,minutes,seconds form was displayed by LCD screen on the other hand. When people were debugging encoder, LED bars display was suitable for professionals monitoring whether the encoder data carry normally or not and reading angle information, LCD display was suitable for non-professionals viewing encoder angle. The system is small, flexible operation, and good visibility. The results show that the angle information in the two ways were displayed simultaneously in the debugging system, easy to read, and display function of system can be further expanded.关键词：space encoder;debugging system;80C32E;LCD display
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发布时间：2020-08-12
Driving & Controlling
- 摘要：According to the measurement process of the human visual contrast sensitivity characteristics and characteristics of Discrete Cosine Transform of the image, a color image compression technology program is proposed based on human visual characteristics. In the program, the color image is converted and described in CLELAB color space at first, and each of the three components of the color image is processed by Discrete Cosine Transform. Secondly, the transform domain coefficients are quantified according to the contrast sensitivity function model of human vision and coefficient's characteristics of Discrete Cosine Transform. The color image is encoded using Huffman algorithm. Lastly compressed images are decompressed using the inverse process, and the color images are matched after decompression. The simulation results show that PSNR can reach 37 dB or more when the compression ratio is 98.355 5:1, and the human eye can not distinguish the differences between the source image and decompressed image, and the coding efficiency can reach more than 0.74, redundancy in 0.26 below, which shows that the color image compression technology solutions proposed can achieve a higher compression ratio under the premise of ensuring the encoding quality and image quality, and is a feasible and effective solution for color image compression technology.关键词：human visual characteristics;color image;image compression;discrete cosine transform;frequency
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发布时间：2020-08-12 - 摘要：Segmentation to adhesion cells is critical in image segmentation realm,with the morphology being used in image segmentation,watershed becomes one of the most efficient skills in solving adhesion cells. However,the traditional watershed algorithm is apt to cause over-segmentation for the noise and irregular shape of macrophages.If extracting the "seeding points" from the distance map,two "seeding points" is combined into one "seeding point" if the distance between them is under threshold after count the distances between each two "seeding points". The redistribution distanee map depending on the new seeding points is segmented by watershed. The simulation results show that the algorithm can effectively segment adhesion macrophages as well as restrain the over-segmentation phenomena with a little more time compared with the traditional method.After segmentation,we can mark the numbers to the cells and abstract the characteristic parameters such as circumference,area,roundness factor,mean gray and so on.
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发布时间：2020-08-12 - 摘要：This research introduces the software and hardware design of an image processing system based on the System On Programmable Chip(SOPC) technology. This system adopts FPGA as the Video signal acquisition control module, using the internally embedded NIOS II soft-core microcontroller of FPGA as the image processing unit. Aiming at the infrared dim-small target with sky background, a novel image pre-processing algorithm is proposed based on morphological and combination of bionics. The proposed algorithm based on mathematical morphology filter used the principle of solid visual budge of human eye to enhance targets and suppress background which adopts the adaptive threshold segmentation method to detect the target. According to the results after the hardware implementation, this system is appa-rently real-time, the performance of the image processing is effective and the target detecting is accurate. The effectiveness and real-time characters of the algorithm is proved.关键词：target detection;IR image;NiosⅡ;solid visual budge
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发布时间：2020-08-12 - 摘要：A new adaptive steganographic algorithm based on image complexity in space domain was proposed. The algorithm takes full advantage of the image's feature that the image with high complexity contains more information and thus can load more secret message. In order to measure the complexity of image blocks in a better way, the algorithm divides the cover image into 3?3 pixel blocks, and then measures the complexity of blocks by computing information entropy and contrast. After that, the algorithm analyzes the statistics of all the blocks'complexity to get the threshold for evaluating the complexity of every block, and then chooses steganographic algorithms with different strength at the different complexity of blocks. The performance analysis and comparison experiments showed that in the same embedded rate, the proposed algorithm has higher RPSN and stronger statistical security in the same embedded rate.关键词：mage complexity;entropy;contrast;steganography
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发布时间：2020-08-12 - 摘要：Aiming at solving the situation that the original SIFT algorithm can only get few number of matching points if there are a few regions similar to the matching image on the reference image, which will affect the estimation of parameters in the transformation model, this paper proposed a method combining SIFT with region segmentation. Compared to the original method, our method can obtain much more correct matching points, and is less time consuming. The experiments demonstrate that our method can acquire nearly 30 times more correct matching points than the original one. Combining region segmentation with the original SIFT feature matching,this method can eliminate at least 90% of the erroneous matching points, besides the improved algorithm can lower the computational burden.关键词：image matching;region segmentation;SIFT;feature detection;feature matching
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发布时间：2020-08-12 - 摘要：With the in-depth development of the infrared physics and infrared technology, the measurement of target radiation characteristics is widely appreciated. And the infrared detector radiometric calibration is a fundamental work. This paper establish a radiometric calibration system, the absolute radiometric calibration of the 3~5 μm infrared focal plane arrays. Firstly, give the radiometric calibration mathematical model, developed a calibration process and the radiometric calibration experiment. As infrared standard source and the impact of environmental volatility, a weighted least squares radiation calibration optimization is proposed. The radiation characteristic measurement experiment was carried out outside the field. Results show that the inversion error of optimization method is better than 4%. The accuracy of radiometric calibration was improved. And the results meet the actual needs of the project.关键词：infrared focal plane array;radiance calibration;weighted least square;radiance characterization measurement
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发布时间：2020-08-12 - 摘要：The presented multi-universe quantum clone algorithm is used to reverse the shortcoming of quantum evolutionary algorithm in image fusion. Firstly, the new quantum group is created by action of clone, mutation and selection. Then the universes are settled as independent parts and the inner structure is constructed as parallel topology. The quantum rotation gate is applied to update individual universe, information among the universes is exchanged by adopting the quantum crossover operation. Finally, the processing of image fusion is described. The experiment results show that this proposed mechanism is an efficient image processing method that can correctly and efficiently fuse the characters of image.关键词：multi-universe;parallel;quantum cloning;image fusion
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发布时间：2020-08-12 - 摘要：A complete test equipment has been prepared for a TDICCD imaging system, being composed of power-supply simulation system, test-control simulation system, 485 bus monitor system, image data collection system. The equipment has successfully been performed to cooperate with the development of someone remote-sensing camera. The experimental results indicate that this equipment works stably,high effectively and can meet the test requirements of TDICCD imaging system.关键词：TDICCD;imaging system;ground test equipment
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发布时间：2020-08-12 - 摘要：The optical system, with high image quality and low distortion can ensure the high mapping precision. The quality of the optical system can be reduced by the effect of stray light. The effect of the stray light is analyzed according as the result of the optical design and the restraining method is putted forward to reduce stray light. The image of three line array mapping camera with stray light is analyzed by using the software LightTools and ZEMAX, the theoretical result of stray light coefficients is less than 5%. The stray light coefficients of each system are tested, and the largest stray light coefficient is less than 6%. The simulated image of optical system with tested result shows the correction of image analyzing with stray light and the feasibility of the stray light restraining methods.关键词：three-line CCD;mapping camera;simulated image;stray light analysis
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发布时间：2020-08-12
Imaging Technology & Image Processing
- 摘要：TRIZ is a theory and method to solve innovation problems. A method of technology maturity mapping based on the S-curve of TRIZ theory was introduced in this paper. The technology maturity is determined by performance, the number of patents, level of patents and profitability four scale variables. This method was firstly applied to LCD technology, which is of important guiding significance to its development. After retrieval and statistics of relevant data, two curves of Time-Number of LCD Patents and Time-Value of LCD Sales were established. Then a comparative analysis of these two curves and standard curves of TRIZ was made. Consequently, the technology maturity of LCD was achieved.关键词：TRIZ;LCD;grade of maturity of product technology;S-curve
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发布时间：2020-08-12 - 摘要：An electronic performance testing system is designed for the TFT LCD. The visual parameter configuration and wireless control are realized for the dust-free workshop and variable drive waveform. The timing and amplitude parameters of testing waveform are configured by the upper computer. The waveform parameters are transferred to the data receive module in the lower computer by the series port. And then, the parameters in the lower computer are sent to the TFT LCD drive circuit module. The single chip is utilized in the TFT LCD drive circuit module to generate the corresponding output waveforms. The testing system has been applied to the LCD manufacturers, and the visual parameter configuration and wireless control have been accepted by the dust-free workshop.关键词：visual parameter configuration;wireless transfer;electric performance;testing system
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发布时间：2020-08-12
Industry and Test Technology
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