最新刊期
      期 2 ， 2010

        Material Physics & Chemistry

      • MA Qing-lan,HUANG Yuan-ming
        Vol. 25, Issue 2, Pages: 161-165(2010)
        摘要：A homologous series of three-benzene-ring containing bent-core compounds N,N-bis(4-(alkylcarbonyloxyl)benzylidene)benzene-1,3-diamine were synthesized by esterifying aliphatic acids with the three-benzene-ring containing bent-core 1,3-phenylene bis(4-hydroxybenzylideneamine), the number of carbon atoms in their two symmetric terminal arms is from 1 to 12. The mesomorphic properties of the homologous series of the three-benzene-ring containing bent-core compounds were characterized by means of polarized optical microscopy and differential scanning calorimetery. The results have demonstrated that the three-benzene-ring containing bent-core compounds can form mesophases.

          
        关键词：banana-shaped liquid crystal;three-benzene rings;bent core;banana phase   
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      • LI Juan-li,LI Jian,DU Wei-song,LUO Wei,GAN Ning,DENG Deng
        Vol. 25, Issue 2, Pages: 166-171(2010)
        摘要：TFT liquid crystals with a low threshold voltage are extensively used for small size LCD. Three series of liquid crystals CGUF,PGUF and PUQUF with high dielectric anisotropy were added to P0,which got two series of liquid crystal mixture,and the effect of different monomers on the properties of the composition were systematically investigated.The results show that the same ratio of PUQUF is the most effective for increasing dielectric anisotropy and lowering threshold voltage of the composition, and for increasing birefringence and shortening response time, the same ratio of PGUF is the best.

          
        关键词：liquid crystal mixture;composition;birefringence;dielectric anisotropy;threshold voltage;response time   
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      • ZHOU Rui,XU Mao-liang,AN Zhong-wei
        Vol. 25, Issue 2, Pages: 172-175(2010)
        摘要：The solid complexes bis(2,4-bimethyl-8-quinolinolinato)(phenolato)aluminum and bis(2,4-bimethyl-8-quinolinolinato)(4-amyl-phenolato)aluminum were prepared in absolute ether system, and confirmed by IR, UV and element analysis. The maximum wavelengths of the film fluorescent spectra for two complexes are 501 nm, 491 nm at room temperature. The and showed 29 nm, 39 nm blue shift in comparison with Alq3 separately. The decomposition processes were investigated by TG-DTG.

          
        关键词：organic light emitting materials;aluminum complexes;thermodynamic analysis   
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      • LI Yong-zhou,JIANG Qing-jun,LIANG Yu-jun,LIU Ming-yu,LIN Hui
        Vol. 25, Issue 2, Pages: 176-180(2010)
        摘要：Novel Ba2ZnS3 : Cu phosphors were successfully prepared by conventional solid reaction via a double-crucible method for the first time. The effect of the technological conditions and Cu doping concentration on luminescent properties of Ba2ZnS3 : Cu phosphors was observed. The crystal structure, morphology and photoluminescent properties of the particles were examined, respectively. XRD results indicate that the pure Ba2ZnS3 crystal structure was obtained at 950 ℃ for all samples. The Ba2ZnS3 : Cu phosphors can excited effectively by 322 nm ultraviolet. The photoluminescence spectra show that the Ba2ZnS3 : Cu phosphor emits a yellow light with a broad emission band centered at 560 nm, which was a promising phosphor.

          
        关键词：Ba2ZnS3 ∶ Cu;solid reaction method;phosphor;concentration quenching   
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      • WANG Juan-juan,YUAN Xi-ming,LI Yu-jin,WANG Yong-qian,SHANG Shu-juan
        Vol. 25, Issue 2, Pages: 181-185(2010)
        摘要：BAM phosphors which were prepared by high temperature solid-state method were coated with Na2SiO3. The spectral properties, surface morphology and the crystal structure were characterized by PDP testing, SEM, IR and XRD, respectively. The results indicated that the relative luminescence intensity increased by 50% through ion doping of Sr2+, Ce3+, Zn2+ and Mg2+. The surface of BAM phosphors was evenly coated by SiO2. The perfor-mance of anti-degradation has been significantly improved by surface coating. The attenuation of the relative luminescences intensity decreases about 10 %.

          
          
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      • SHANG Shu-juan,YUAN Xi-ming,WANG Yong-qian,WANG Juan-juan
        Vol. 25, Issue 2, Pages: 186-191(2010)
        摘要：Sub-micron of red phosphor (Y,Gd)BO3 : Eu3+ was prepared by co-precipitation method combined with ultrasonic dispersion. The effects of ultrasonic time on the ion-mixing and the precipitation process, thereby the effect on the performance of powders were studied. The composition, structure and optical properties under VUV were characterized by using infrared spectroscopy (IR), scanning electron microscopy (SEM), powder X-ray diffraction (XRD), PDP VUV phosphor test system. The results showed that groups in (Y,Gd)BO3 : Eu3+ is four-coordinate-based with a mixture of three-coordinate, (Y,Gd)BO3 is structure of vaterite, the space group is P63/mmc (194), with cell parameters are a=3.778, c=8.814. Comparing the powder prepared by using ultrasonic dispersion in the process of ion mixing and precipitation with the powder prepared by not using ultrasonic dispersion, the relative luminescence intensity increases, color coordinates a red shift (x=0.639 2, y=0.360 4→x=0.642 2, y= 0.357 5), R/O (626 nm/592 nm) increases by 12%, particle size is about 600 nm. And it has a small uniform particle morphology and a good dispersion performance.

          
        关键词：ultrasonic dispersion;powder preparation;nano-particles;red/orange ratio   
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      • HU Xiao-yang,FANG Yu-qing,LI Yan-na,WANG Ying-han
        Vol. 25, Issue 2, Pages: 192-195(2010)
        摘要：A series of polyimides with different side chain content had been copolymerized from 4-dodecyloxy-biphenyl-3', 5'- diaminobenzoate, 3,3'-dimethyl-4,4'-methyl-enedianiline (DMMDA) and 4,4'-oxydi(phthalic anhydride) (ODPA) via one-step method. The synthesized polyimides also possessed solubility in N-methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF), N,N-Dimethylacetamide (DMAC), dimethylsulfoxide (DMSO) and trichloromethane (TCM). Meanwhile, uniform and stable vertical alignment of liquid crystal was induced by the polyimides films, and even after the rubbing process, the pretilt angles of liquid crystal show good stability.

          
        关键词：polyimides;solubility;vertical alignment;liquid crystal   
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        Device Technology & Physics

      • YANG Xiong,HU Li-qin,WU Chao-xing,CHEN Yong,LIN Zhi-long,GUO Tai-liang
        Vol. 25, Issue 2, Pages: 196-199(2010)
        摘要：A screen printed under-gate triode structure device with carbon nanotube field emitters is studied and produced. The electric-field of the cathode is simulated by using the software of ANSYS and produced with the best parameters. The pixels of the device are 30×30 and the display area is 54 mm× 54 mm. The currents density achieved 5 μA/cm2 when the anode voltage was 1 500 V and gate voltages was 300 V.The device has low production cost, a good stability and uniformity, and can be matrix-addressable to display words and pictures.

          
        关键词：screen printed;under-gate;ANSYS;field emission display;simulation   
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      • TANG Yuan-he,ZHANG Rui-xia,LIU Han-chen,LIU Shu-lin,LIU Kai,GAO Hai-yang,YANG Xu-san
        Vol. 25, Issue 2, Pages: 200-204(2010)
        摘要：In order to better apply LCD to the gated imaging system, based on the electro-optic effect of LCD,the relationships between transmittance and wavelength, birefringence index, voltage are derived theoretically. The dispersive of twisted nematic liquid crystal is quantitatively analyzed from the relationship of effective birefringence and transmittance. By the grating spectrometer, the transmittance of liquid crystal is measured and analyzed using Sony LCX023CMT TFT-LCD at 380~1 100 nm wavelength and altering grey level from 0 ~ 255 in this experiment. It was found that the LCX023CMT LCD has a low dispersion within the visible light. But dispersion increased along with the gray level. Two pictures have been shot under same environment by self-made partial gated imaging system or without which are contrasted each other, and there is little dispersive effect which can not affected the imaging quality. The partial light intensity gated can be realized for the strong near infrared by its 12% transmittance.

          
        关键词：liquid crystal;dispersion;gated imaging   
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      • ZHANG Jian-ping,WANG Rui-tao
        Vol. 25, Issue 2, Pages: 205-209(2010)
        摘要：In order to estimate the reliable lifetime of Vacuum Fluorescent Display (VFD) more accurately, and reduce testing time, four constant stress accelerated life tests (CSALT) were conducted by establishing accelerated life test model. The statistical analysis on test data was achieved by applying the Weibull model to describe the lifetime distribution, and Least Square Method (LSM) to estimate the Weibull parameters. Furthermore, accele-rated life equation was determined and self-developed software was employed to predict the VFD lifetime. The numerical results show that test design scheme of CSALT is correct and feasible, that the VFD lifetime follows Weibull distribution, that the life-stress relationship meets linear Arrhenius equation completely, and that the VFD failure mechanism keeps constant at each temperature stress. The proposed methods and the estimated reliable lifetime of VFD can provide some significant guideline to its manufacturers and technicians.

          
        关键词：vacuum fluorescent display;reliable lifetime;accelerated life test;constant stress;Weibull distribution   
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      • ZHANG Lou-ying,CUI Yi-ping,LUO Zong-nan,ZHOU Li
        Vol. 25, Issue 2, Pages: 210-214(2010)
        摘要：To study color offset in the process of high-power LED life aging, a series of power white and blue LEDs are lighted continuously under invariable current respectively. Emission spectra, color coordinates and color temperature are measured at different period. Their changes are researched. Based on the analysis of cause of color offset, the result is that the color of LEDs are different at different period with the same current and different current lighting. It indicated that the colour offset of high-power LEDs are caused not only by aging of phosphors, but also due to the changes in the material itself. The results will provide a reference to the application of white LED and for the further study.

          
        关键词：high-power LED;emission spectrum;life;color offset   
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      • ZHANG Yong-ai,ZHANG Jie,XU Hua-an,YAO Liang,GUO Tai-liang
        Vol. 25, Issue 2, Pages: 215-219(2010)
        摘要：In allusion to the characteristics of the FED electrode, a kind of defect inspection system for FED electrodes is proposed in this paper,which can detect the defects of short circuit and open circuit,etc. The system includes hardware and software. The hardware is composed of CCD camera (initial location and orientation), single-chip (data testing and transmission) and computer (data receiving and processing). The software consists of program design of single-chip pretreatment and advanced programming of computer object orientation. The defect inspection system has been applied to the fabrication of FED electrodes after the design and installation of hardware and program debugging of software.

          
        关键词：FED electrodes;CCD;single-chip microcomputer;Visual C ++;defect inspection   
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        Driving & Controlling

      • LIN Zhi-cheng,SHAO Qing-yi,CHEN A-qing
        Vol. 25, Issue 2, Pages: 220-224(2010)
        摘要：A high driving capability CMOS buffer amplifier with high slew-rate,low power consumption is proposed. Low power and high driving capability are achieved by using a Class AB push-pull stage and two Class B auxiliary stages with positive feedback. The design buffer amplifier draws 7 μA static current and the setting time to 1% precision is less than 6 μs under a 0~20 nF capacitance load with a 0.15 μm CMOS model,which satisfies the setting time requirement of LCD driving circuit; By using cascoded frequency compensation combined with zero formed with the capacitive loads,large dynamic range of capacitive loads is satisfied.

          
        关键词：CMOS;LCD driver;buffer amplifier;low-power;Class AB output stage;Class B output stage   
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      • XU Zheng-ping,GE Wen-qi,WANG Xiao-kun,LI You-yi,XU Yong-sen,LI Jun,HUANG Pu
        Vol. 25, Issue 2, Pages: 225-229(2010)
        摘要：In order to get the information of the motor car in real time, the LCD and voice chip are used in the intelligent motor car system. The intelligent motor car system includes two modules, which are motor car and wireless control. The motor car operation is controlled by the instruction received from the wireless control system. When the instruction is sent out, the instruction would be displayed on the LCD and the voice chip would also send out responsive sound. The voice module could be recorded in the field. Based on the general introduction to the system, the LCD and voice module are analysed. The picture of wireless control module is given at last. The result of the actual system shows that LCD display and voice module are synchronous to the instruction sending, and the recording function of the voice module is convenient to realize.

          
        关键词：LCD;voice chip;wireless control;tracking;avoiding obstacle   
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      • CHEN Yu,WU Jin
        Vol. 25, Issue 2, Pages: 230-234(2010)
        摘要：In intelligent traffic system, the past general video camera took shoot, record, and processing to number plate of all passed vehicles. Restricted by the definition of the image collecting device, the pictures only include the figure, color, number plate and velocity of the car. But the public security enforcement expects to dominate more particular and distinct information in investigating and collecting some public security and traffic accident cases. For example, facial feature of the driver, the information of drivers cab, clear figure of the car and the wagonload etc. This article adopts TMSDM642 to design a kind of new high-definition video camera, we can use the naked eye to distinguish the color and figure of the vehicle, number and color of the plate, facial feature of the driver in snap shoot.

          
        关键词：intelligent transportation systems;TMS320DM642;high-definition video camera   
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      • FU Zuo-wei,FU Xing,ZHONG Ru-jun,CHEN Zhi,BAI Mao-sen
        Vol. 25, Issue 2, Pages: 235-239(2010)
        摘要：The PCI local bus is an advanced and high performance 32/64 bit bus with multiplexed address and data lines, which is easy to realize I/O controlling card or communication interface card under high-speed and real-time. A PCI bus controlling card based on CH365 chip is designed in this article. The card mainly consists of PCI interface chip,MCU and data buffer. At the same time, display circuit based on driver chip CH451 is designed, the circuit connected control signal of MCU. It can realize data display with fewer pins as several CH451 chips are applied by parallel connected. The experiments proved that field display is feasible based on PCI bus controlling.

          
        关键词：PCI bus;CH365;CH451;field display   
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      • LIU Bin,HAN Jin
        Vol. 25, Issue 2, Pages: 240-244(2010)
        摘要：On the basis of analyzing the principle of embedded touch panel system, the working principle and control method of dedicated controller ADS7846 Touch Screen were analyzed. By the SPI interface between ADS7846 and MCU, AT89S51 measurement subroutine flowchart was given. The method of obtaining coordiates of touch-screen and the LCD screen display synchronization algorithms were proposed to improve the efficiency of touch-screen and LCD screen, and to suffice the control precision.

          
        关键词：touch panel;single chip computer;ADS7846 controller;serial parallel bus   
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      • HE Jin,CHENG Chip
        Vol. 25, Issue 2, Pages: 245-249(2010)
        摘要：ADSP-BF561 was used to implement the embedded LCoS(Liquid Crystal on Silicon) image projection display interface. The framework of the interface was proposed, and level switch and serial-to-parallel were avoided. This paper emphasized on the controlling of the image outputs, and the processing of color conversions and trapezoid correction of image data by DSP. In color conversions, image data in YUV color space was conversed to image data in RGB color space by color conversion equations. In trapezoid correction, the obtained RGB data was calculated by trapezoid transforming after image interpolation, and made the contrast of the trapezoid image with the source image. The design was programmable, extensible, and low-powered. It was implemented in a simply way. A QVGA projecting image was obtained, and the time and space resources met the requirements.

          
        关键词：LCoS;ADSP-BF561;color conversions;trapezoid correction   
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      • LI Xiu-zhen,XU Yian-wen,WAN Li-fang,WANG Qing-jiang,ZHAO Xing-xing
        Vol. 25, Issue 2, Pages: 250-252(2010)
        摘要：An edge light LED backlight is designed in this paper. LED array is designed with rectangle type, processed with MCPCB. Boost inverter which supports over-voltage protection is used in the driver module. The brightness of LED light-bar is controlled by PWM wave produced from single-chip microcomputer in the control module. A LED backlight is designed in this paper, which has a good optical effect and supports keyboard dimming. The circuit is simple in this design. This paper can also be used for the design of medium-sized and large size LED backlight.

          
          
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      • WU Jun-qin,MIAO Rui-rui,LI Yan-li
        Vol. 25, Issue 2, Pages: 253-256(2010)
        摘要：The brightness control method based on PWM is introduced. The difficult problems and key technology of digital LED screen are analyzed. The design of scanning controller for large scale LED screen is discussed, and a solution of scanning controller based on FPGA is proposed. The experiment results showed that the structure of the newly-designed scanning controller was flexible, its performance is excellent, and the LED screen controlled by this scanner is suitable for indoor and outdoor video display.

          
        关键词：colour LED screen;scanning controller;LED;PWM;FPGA   
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      • WANG Cheng-yi,GUO Xiu-mei,CONG Xiao-yan
        Vol. 25, Issue 2, Pages: 257-261(2010)
        摘要：A method of using finite state machine to design human-machine interface based on liquid crystal is proposed by analyzing the special character of state transition of finite state machine. The paper discusses the process of human-machine interface design in detail by using C language and taking menus transition for example. Menus transition is achieved by using SPLC501C liquid crystal and display driver for menus transition is given. Practice has proved that this method is feasible, easy to extend the number of menu and can avoid the emergence of non illegal states, and the menu transition is very fast, stable and reliable.

          
        关键词：finite state machine;microcontroller;human-machine interface;liquid crystal display;menu design   
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      • YIN Zhu-xia,ZHENG Xi-feng,YU Hong-tao
        Vol. 25, Issue 2, Pages: 262-267(2010)
        摘要：The next-generation 32-bit embedded RISC microprocessor S3C2410 based on ARM core and FPGA component were applied to the control center, communicating with the host computer via Ethernet. The system supports 256 full-color LED gray-scale screen of text, images, and animation, at the same time can storage more display content and have fast transmission of image data rate. ARM controls datas download, storage and delivery, and FPGA to achieve the acceptance of data, cache and scan. ARM communicates with FPGA using the ARMs built-in LCD interface, a parallel data transmission, achieving the objective transmission rate, and the largest display size up to 1 024×1 024 resolution of the picture. At present, the system can display the 256×256 resolution image, in order to improve system flexibility and applicability, the picture is divided into the size of 128×64 image block, which can be selected through an external jump pin, the entire system has strong stability and versatility.

          
        关键词：LED off-line screen;ARM;S3C2410;FPGA;LCD interface   
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      • ZHANG Lei,DING Jin-hua
        Vol. 25, Issue 2, Pages: 268-272(2010)
        摘要：According to the requirements of industrial applications, and combined with Silicon microcontroller C8051F310, the design and driving control of a customize Struts LCD module VT066 as output display of Super Lizer is introduced.The hardware configuration and software design process of the display system are described in detail with the hardware interface block diagram and software flow chart being presented. This LCD module has advantages of stable property, friendly interface, many of show contents and occupies less I/O sources.

          
        关键词：C8051F310;struts LCD;VT066;super lizer   
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        Imaging Technology & Image Processing

      • ZHAN Yong-xin,ZHENG Xue-ren,CHEN Jian-bin
        Vol. 25, Issue 2, Pages: 273-277(2010)
        摘要：Contrast enhancement process is needed in the images in order to improve its visual quality. Starting from the point of spatial methods of image enhancement, Retinex-related methods are analyzed. Considering the defects of the Retinex algorithm, processing method based on luminance and Guassian function using IIR implementation are proposed in this paper. The simulation results prove that these measures can not only enhance the images, and can prevent grayish, keep color constancy and accelerate the processing speed.

          
        关键词：image enhancement;Retinex;MSR;Guassian filter;IIR implementation   
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      • ZHANG Lin,LIU Xi,LI Da-hai,WNG Qiong-hua
        Vol. 25, Issue 2, Pages: 278-282(2010)
        摘要：An almost perfect disparity image is selected from the multi-view images to act as a standard image to correct the other color erroneous disparity images. All these disparity images color space are changed from RGB to YUV. The color correction factors of the color erroneous disparity images in YUV color space were computed and used to yield the real gray values of the color erroneous disparity images pixels. Finally the disparity images color space is transformed back to RGB color space, and the correction of the color erroneous disparity images is finished. The method performs well as the extent of the color cast not more than 15% according to the experiment, so it improves the quality of the 3D display.

          
        关键词：3D image;disparity images;color space;color correction   
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      • HAN Zhuang-zhi,CHEN Peng,HE Qiang,WANG Yong-lei
        Vol. 25, Issue 2, Pages: 283-286(2010)
        摘要：An adaptive displaying method is proposed for the software interface of embedded system based on liquid crystal display (LCD). The characteristic of different derivate versions of Windows CE is analyzed. An adaptive displaying method based on display resolution detecting is proposed, the equations and process is given. Based on this method, one program can run in the embedded systems with different displayer. The method can greatly improve the program efficiency of embedded software based on Windows CE. This method can also be applied in other embedded operating systems.

          
        关键词：embedded system;display program;adaptive;Windows CE   
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      • ZHANG Hao,LI Da-hai,WANG Qiong-hua,LIU Xi
        Vol. 25, Issue 2, Pages: 287-291(2010)
        摘要：In stereoscopic displays, the stereoscopic display effect is related to the parallax of stereo image pairs, and parallax is affected by cameras layout when the parallax images are captured. In the paper, camera calibration technique for binocular stereo vision system and the spatial geometric relationship are used to determine the position relation between any two cameras. And then the calibration result is applied to adjust the spatial position of the two cameras continually in order to make the two optical axes parallel to each other approximately. As a result, the image pairs acquired can guarantee a better stereoscopic display effect. Finally, the allowable variation range of the spatial angle between the two cameras is yielded experimentally. The results can be used to conduct the adjustment for the photography system of autostereoscopic display.

          
        关键词：autostereoscopic display;parallax;camera calibration;image acquisition   
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      • LI Yi-bo,LI Xiao-bing,ZHOU Xian
        Vol. 25, Issue 2, Pages: 292-296(2010)
        摘要：Focusing on the speed problems of the traditional digital signal devices,a design of fast median filter based on FPGA was proposed in this paper. The hardware architecture of fast median filter and the code realization of register transfer were introduced, the whole system was simulated, and the experiment results was analyzed.

          
        关键词：media filter;FPGA;digital image processing   
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        发布时间：2020-08-12
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