最新刊期
期 6 ， 2009
- 摘要：A reflection-type liquid crystal (LC) test cell prepared with a K-band rectangular waveguide is used to determine the dielectric constant of LC materials. It is found that the usual LCs showing positive or negative dielectric anisotropy in 1 kHz reveal positive dielectric anisotropy in millimeter wave region. Furthermore, the high frequent dielectric anisotropy shows slight difference among the LCs and weakly frequency dependency between 26.5~37 GHz.关键词：rectangular waveguide;liquid crystal;dielectric constant
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发布时间：2020-08-12
Invited Paper
- 摘要：Three kinds of acryloxy-capping substituted benzoic acid compounds were synthesized and characterized; the corresponding symmetric hydrogen-bonded liquid crystals (H-boned LCs) based on 4, 4'-bipyridine (BP) or 4-((E)-2-(pyridin-4-yl)vinyl)pyridine (DPE) were prepared. The structure of precursors as well as the H-bond structures were confirmed by the 1H nuclear magnetic resonance (1H-NMR) and by Fourier transform infrared spectroscopy (FTIR). The mesogenic behavior of the H-bonded complexes was demonstrated by the polarizing optical microscopy (POM) and the differential scanning calorimetry (DSC). It was found that the fluoro substituent on the mesogenic core made the molecular width increased and thus the aspect ratio of the molecular decreased, therefore it could weaken the mesogenic behaviors of the H-bonded LCs such as decreasing the melting point as well as the clear point. Additionally, the introduction of terminal acryloxy group and the increase of induced rigid core could enhance the molecular length and regularity, resulting in the increase of phase transition temperatures of the complexes.关键词：liquid crystal;hydrogen bond;acryloxy-capped;fluoro-substitution;self-assembly
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发布时间：2020-08-12 - 摘要：A group of liquid crystal (LC) single compounds with low polar or fluorine substitutes, which employee tolane as their mesogenic core, were synthesized and mixed with commercial liquid crystal mixture (10% by weight). Then, parallel-aligned liquid crystal cells were made with these mixtures. The viscosities of these mixtures were measured by rotational viscometer respectively. And the birefringence (Δn) of these LC cells were measured by spectroscopic ellipsometer at 633 nm. The Δn of each LC single compound was extrapolated, the results show a reasonable correlation with that calculated by Vuks equation. These tolane-type liquid crystals have remarkable higher Δn than the biphenyl compounds, and relative low viscosity, so should be suitable for the applications that require high speed response.关键词：birefringence;viscosity;tolane;fast response;liquid crystal
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发布时间：2020-08-12 - 摘要：This paper investigated the effect of cholesterol on the structures of the phosphatidylcholine (PC) and ceramide(CER) of duality system by the pressure-area(π-A) isotherm measurements and by atomforce microscopy(AFM) observation. It is shown from the π-A isotherms that the increase of cholesterol can accelerate the occurrence of phase change and advance the stabilization of films. Also, it is found from the observation of AFM that the duality systems (PC/CER)molecular film takes on microregion structure. With the increasing of cholesterol content,the mixed films transforms from the chains structure to larger slice and net coexisted structure. In the end, pure cholesterol forms more aggregated structure.关键词：lipid raft;LB technique;atomic force microscopy;cholesterol
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发布时间：2020-08-12 - 摘要：Low driving voltage PDLC samples were prepared by acrylate polymer in this paper. Optical-electric curve shows that the driving voltage of PDLC can be lowered to 25 V. By changing the diluent monomers in the polymer system, the driving voltage of PDLC can be changed largely. The experiment result shows that the dielectric constant and impedance of polymers play the key role in PDLC driving voltage. Besides, the composition of liquid crystal mixtures can also affect the driving voltage of PDLC to some extent.关键词：PDLC;acrylate;dielectric constant
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发布时间：2020-08-12 - 摘要：Al-doped 6H-SiC nanowires (Al/6H-SiC) were successfully fabricated via catalyst-assisted pyro-lysis of polymeric precursor. The samples were characterized by HRTEM,EDS and XRD. The results showed that the doped concentrations were adjusted from 0.5% up to 1.25% with the Al concentrations in the precursors. The HRTEM pattern illustrated that the lattice fringe spacings are 0.26 nm and 0.25 nm. EDX shows the atom ratio of Si and C is 1 : 1. The XRD pattern demonstrated that Al-doping causes a decrease in the lattice parameters with Al concentration as compared with standard values. The optical properties of single-crystalline 6H-SiC nanowires with different Al doping levels were characterized by Raman and absorption spectra. The Raman spectra reveal that the phonon energy of the single-crystalline SiC nanowire is 100 meV. We estimated the optical absorption band-gap of nanowires from optical band-edge absorption. Al doping results in a red-shift on the optical absorption edge of SiC nanowire, thus it demonstrates a reduction of optical band gap.关键词：SiC;polymeric precursors;pyrolysis;nanowire;doping;optical properties
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发布时间：2020-08-12 - 摘要：A new instrument for X-ray luminescence spectrum was established in order to study properties of X-ray luminescence materials,which consists of X-ray generator, optical fiber and fluorescence spectrophotometer and can determine spectral distribution graph, time-change graph, afterglow decay curve. The results showed that both of stability and precision are fine and relative standard deviation(RSD)is less more than 2%. The instrument simplifies the process for determining X-ray luminescence materials.关键词：X-Ray luminescence materials;X-Ray emission spectrum
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：Polycrystalline silicon (poly-Si) films consisting of super-large disk-like domains were obtained with solution-based metal-induced crystallization (SMIC) of amorphous silicon. The prepared disk-like domain SMIC poly-Si has an average domain size of up to 50 μm, highest hole Hall mobility of 30.8 cm2/V·s, and highest electron Hall mobility of 45.6 cm2/V·s. P-type poly-Si TFT based on disk-like domain SMIC poly-Si has high field effect mobility of 70~80 cm2/V-1·s-1, sub-threshold slope of 1.5 V/decade, on/off state current ratio of 1.01×107 and threshold voltage of -8.3 V. Also, P-type disk-like domain SMIC poly-Si TFTs exhibited excellent reliability under high gate bias-stress and hot carrier bias-stress.关键词：disk-like domain SMIC poly-Si;poly-Si TFTs;TFT reliability
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发布时间：2020-08-12 - 摘要：Based on the divergent beam system of lens, the fully-leaky guided mode characterization of liquid crystal layer have been studied by means of the prism-coupling technique. The guided wave figures of a parallel aligned nematic liquid crystal cell with cell gap 4.6 μm, in which the liquid crystal E7 is filled, have been given through experiment. By comparing the guided wave pictures with the theoretical simulation results, the guided modes of the liquid crystal waveguide predicted by theory are well consistent with the guided wave figures obtained through experiment.关键词：nematic liquid crystal cell;divergent beam system of lens;guided wave;guided modes;waveguide
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发布时间：2020-08-12 - 摘要：Transparent conducting titanium-doped zinc oxide films with high transparency and relatively low resistivity have been successfully prepared by DC magnetron sputtering at room temperature. SEM and XRD studies revealed that all the films were polycrystalline with a hexagonal structure and a preferred orientation along the c-axis. The resistivity achieved was 1.73×10-4 Ω·cm at a thickness of 437 nm.All the films present a high transmittance of above 91% in the visible range.关键词：Ti-doped zinc oxide films;transparent conducting films;magnetron sputtering;optic-electronic properties
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发布时间：2020-08-12 - 摘要：An experiment setup with a single-step exposure to prepared 2D grating was designed. A 2D grating based on polymer dispersed liquid crystal (PDLC) with better electro-optical property was fabricated through single-step exposure setup. The sample was checked by POM,AFM and He-Ne laser. The results indicate the samples have clear 2D grating structure, and some fairly ordered lattices in the visual field, and the diffraction efficiencies can be modulated by electric field. All results in this work show that multiple types of electrically tuning liquid crystal devices could be made by design of optical sketch.关键词：liquid crystal;holographic polymer dispersed liquid crystal;two-dimensional grating
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发布时间：2020-08-12 - 摘要：PDLC films were prepared with the method of PIPS(photo polymerization induced phase separation) by macro-initiator prepared by RAFA(reversible addition fragmentation chain transfer).The effect of RAFT-M on electro-optical properties of PDLC films was investigated. It was found that as the RAFT-M and photo initiater increased, both the threshold voltage and saturation voltage increased, and both the off-state transmittance and the on-state transmittance decreased.关键词：PDLC;RAFT;electro-optical properties
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发布时间：2020-08-12 - 摘要：Highly conducting and transparent gallium doped zinc oxide (GZO) thin films had been deposited by r.f. magnetron sputtering method on glass substrates. The dependence of GZO films crystal and conducting properties on argon gas pressure was investigated by X-ray diffraction (XRD), atomic force microscopy (AFM) and four point probe methods. The obtained GZO films were polycrystalline with a hexagonal wurtzite structure and preferentially oriented in the (002) crystallographic direction. As argon gas pressure increased, the sheet resistance and resistivity both increased with the lowest value of 17.6 Ω/□ and 7.3×10-4 Ω·cm, respectively. In addition, the transmittance of the GZO films in the visible range was over 90%.关键词：GZO;magnetron sputtering;argon gas pressure
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发布时间：2020-08-12 - 摘要：Dichroic dyes and application in liquid crystal display was studied.The blue dyes absorb leaked red and yellow background-light especially in oblique direction at dark state, and the dyes dont absorb light when turning following LC molecules at white state, so the contrast of TN-LCD is improved because red and yellow light are main part in back-light, and humans eyes is more sensitive to them. As results, the contrasts of three samples are improved to 54.92,67.77 and 50.30 from 47.87, 60.32 and 42.04;the steepnesses are leaned over 1.56,1.55,1.58 from 1.41,1.39, 1.40 for increasing grey scale;the viewing angle is improved as the curve of contrast with 10 and 20 by 5° on the left and right.关键词：contrast;dichroic;anthraquinone;azo
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发布时间：2020-08-12 - 摘要：Based on the analysis of traditional layout of LED matrix array, a mathematical model is built to optimize the luminance uniformity. Design of novel triangular LED array unit is proposed for improving high uniformity of the direct LED Backlight Units (BLUs) for large area LCD-TVs. With the structure of the triangular LED array unit well illustrated and designed, the comparison simulation between traditional and novel layout using Lighttools software is executed to prove that the novel design performed better on the parameter of uniformity. When the light box thickness is at 20 mm, the uniformity of the novel design reaches 90.79%, which is 2% better than the performance of traditional design at 88.77%; when the layout of the LEDs is dense, the improvement that the novel design brings is not obvious, which is about 1%; along with the rising of the light box thickness, the improvement is redu-cing, when it comes to 24 mm, the figure only stays at 0.3%.关键词：LED backlight;direct type;triangular layout;uniformity
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发布时间：2020-08-12
Device Technology & Physics
- 摘要：This paper designs a display system of hybrid electric vehicle based on Windows CE embedded operating system and ARM. Completed work consists of hardware and software implementation proposal, customization of WinCE OS, development of application program and its self-starting. HEV's information is obtained through serial port communication, and displayed on LCD screen in real-time, and meanwhile, user's operation is realized by touch screen. In addition, the method of transplanting FLASH animation to Windows CE animation is studied while developing the animation interface. It will be of certain reference for design and implementation of animation interface.关键词：hybrid electric vehicle;display system;Windows CE;animation interface
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发布时间：2020-08-12 - 摘要：OLED display module was used as a man-machine interface in the traffic signal system. In this design, the OLED display realizes the 128×64 pixels of picture and character monochrome display with 16 gray-scales. The intelligent traffic signal system with OLED display not only can provide good man-machine interface, and adapt to the harsh outdoor environment, but also can achieve multi-phase and multi-time control of traffic flow. The intelligent traffic signal system with OLED display uses the ARM9 as processor, so a scientific algorithm can be embedded in it to carry out effective control of traffic flow.关键词：OLED;SSD1325;ARM9 processor
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发布时间：2020-08-12 - 摘要：A novel design for full color LED screen off-line display system based on embedded system was proposed in this paper. The goal of this project is to develop a solution of tiny off-line display system which can support full color high definition LED screen. The multimedia coprocessor SM501 was adopted to solve the bottleneck of display system in a typical embedded architecture. Software interface of 2D graphic acceleration for SM501 was designed to speed up the display and optimize the video play. This project solved the limitations in current LED off-line control card,such as support only homochromy or pseudo color LED screen,support only low definition screen and does not support for high quality video display.关键词：SM501;LED off-line display;S3C2440;Xvid
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发布时间：2020-08-12 - 摘要：The analysis and design of a multifunctional terminal based on S3C44B0 and S1D13506 is presented. The terminal can be configured to meet different application demands. This paper introduces the architecture and the module partition of the terminal, and expatiates on the detail design of each module. And the results of verification are given.关键词：terminal;S1D13506;S3C44B0;μC/OS;C/GUI
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发布时间：2020-08-12 - 摘要：Display controlling system of bearing fault diagnosis instrument was designed based on DSP in this paper. The interface between LCD module and DSP was provided, the problem of time sequence compatibility between LCD module and DSP was solved, the driving software was programmed using C language.关键词：DSP;LCM;timing;interface
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发布时间：2020-08-12 - 摘要：The LCD bus-stop-reporting system have been designed based on Proteus software, an embedded system hardware and software simulation platform.The hardware circuits includes the control device AT89C51, display module LCD 128×64 and 4 operation button.Via Chinese modulus software to generate Chinese characters lattice, and using assembly language, the simulation of No.2 bus-stop-reporting in one-way direction was realized in the Kangding county.关键词：bus-stop-reporting system;Proteus;AT89C51;LCD 128×64
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发布时间：2020-08-12 - 摘要：This paper presents a block cipher algorithm based on the chain-rules CA,which is by means of iterating cellular automata backward-to-encryption and forward-to-decryption at a fixed boundary. The results show the error propagation of ciphertext with an unchanged key and ciphertext with an unchanged plaintext is close to 50%. This cryptosystem can resist known-plaintext attack and known- ciphertext attack.关键词：chaos;chain C cellular automata;block cipher
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发布时间：2020-08-12 - 摘要：An interpolation algorithm used in image zooming was introduced and a real-time monitoring image zooming based on FPGA was presented. The algorithm was discussed. Both of the implementations were compared to verify in hardware resource utilization and efficiency, and demonstrated the superiority of the block interpolation. The system is proved to be stable when it is applied to the monitoring image zooming with real-time and high-resolution.关键词：image zooming;FPGA;bicubic interpolation
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发布时间：2020-08-12 - 摘要：This paper introduces the graphics dot matrix OLED display module based on the SH1123 drive,and then gives out the hardware interface circuit between the C8051F340 microprocessor and the module. Through a brief analysis of the SH1123 command system, the paper focuses on the realization of the underlying drivers of the module in the C language programming environment. It provides the realization of using keys to control the display menu.The OLED has good display effect and low power. So it is very suitable to the application which human-computer interaction interface shall has good display effect and low power requirements.关键词：microprocessor;interface;drive program;OLED display
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发布时间：2020-08-12 - 摘要：A complete design of the virtual LED display control system was proposed according to the special request and the characteristic of LED virtual display monitor, and by using the design method of the system on chip (SOC) and the programmable system on chip (SOPC). This paper proposed specially one kind of improved D/T transformation technology in the LED sequence generators design. It does not need any data processing in advance, only uses a function to control the brightness of all pixel likely. The result indicated that this design has solved the problem of high-speed requirement for the control system, which is caused by the pixel time division multiplex access(TDMA) in the LED virtual display panel, guaranteed the displayers refreshing speed, meanwhile reduced the real color display systems complexity. This design proposal can guarantee that the picture displays effectively and in real-time, and has the strong usability.关键词：LED display;virtual pixel;SoPC system;direct memory access transmit;Nios soft core;Avalon bus
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发布时间：2020-08-12 - 摘要：This paper mainly introduces the advantages of DVI interface on digital transmission and its working principle. An expansion system was designed in order to achieve synchronous output of DVI. Finally, the paper overviewed the design of high-speed systems using a PC-board layout.关键词：DVI;TMDS;EDID;high-speed board design techniques
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发布时间：2020-08-12 - 摘要：Driving and controlling of TFT-LCD was realized based on S3C2410 microcontroller. Then, it was integrated with Micriums μC/GUI, graphical user interface, together to form a compact embedded software system. GUI hardware design, GUI and LCD modules work mechanisms were introduced thoroughly. GUIs transplantation methods based on ARM were discussed particularly.关键词：μC/GUI;ARM;TFTLCD;S3C2410
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发布时间：2020-08-12
Driving & Controlling
- 摘要：The application of histogram equalization enhancement algorithms in display system is introduced. Real-time parallel processing of batches data of FPGA (Programmable Logic Device) is used in achieving histogram equalization enhancement. Compared with the traditional DSP method,the advantage of this system is noticeable in real-time image processing and work efficiency.The implementing method of the main function module is provided. The system is simple,compact and reliable.关键词：real-time image processing;histogram equalization;FPGA;display system
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发布时间：2020-08-12 - 摘要：Moriě fringe problem is an ordinary problem in autostereoscopic display based on parallax barrier and lenticular lens. It can seriously affect the characteristics of display. This paper builds a simple model to study the principle of Moriě fringe, when the pitch of BM, the observing distance, the angle of barrier change. The results prove that the principle is right. It can be a reference to solve the Moriě fringe problem of autostereoscopic display based on parallax barrier and lenticular lens.关键词：Moriě fringe;autostereoscopic display;parallax barrier;lenticular lens
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发布时间：2020-08-12 - 摘要：The merits and the shortcomings of several popular kinds of surface type light valve in marketplace were compared according to the characteristic of laser display. Adopting the feature of laser display and comparing the characteristics of current ultra-thin optical projection display systems, an ultra-thin lens for laser TV was designd. The projection distance is 100 mm, the screen size is 157 cm(62 in). Using TIs 20.3 mm(0.79 in) DMD chip as spatial light modulator, the system is composed of a aspherical mirrors and five refractive lens. It is showed from the simulation results that the imaging quality of the system is good. It has lower request for components processing and alignment in the design.关键词：laser display;surface type light valve;projection lens;lens power
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发布时间：2020-08-12 - 摘要：In order to reducing the damaged risk of a linearity CCD camera which was debug frequently, the CCD cameras characteristic and timing diagram were analyzed, a CCD camera simulation system was designed based on Field Programmable Gate Array(FPGA). The system made the FPGA as the core device, a Read Only Memory(ROM) was in inaugurated inside FPGA, which stored a standard image gray data, output gray data in the falling edge of pixel clock, counted the amount of pixel clock which bringed Trigger Line Readout and horizontal synchronization signal. The simulation results show the simulation process of the linearity CCD camera simulation system satisfies the demand of CCD camera timing diagram. The design of the simulation system shortens the engineering debug time, provides guarantee for evening data collection and storage.关键词：CCD;LVDS;FPGA;simulation system
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发布时间：2020-08-12 -
Method and Realization of Auto Light Control of Large Visual Field CCD Camera Used in Target Tacking
摘要：According to the special structure of the large visual field CCD camera used in moving target tacking, a new method based on adjusting the electronic shutter steplessly is proposed to get the high quality image. Through adjusting the exposal time in real time, we could make the light adjusting fast and accurately. To draw the gray scale of the image, this paper put forward a new method named the gray scale weighting of different regional. Since the large visual field CCD camera has a lot of background image data, it will bring much influence to the auto light control. The new gray scale drawing method which is advanced in writing could eliminate the influence. Using the RAM of FPGA, the system ensured that the light-adjusting arithmetic could work in real time by the ping-pang buffer usage strategy. The radiation scale and the result of location experiment indicated that the method could offer best image quality when the radiant luminance is from 25 W/m2·sr to 260 W/m2·sr.The dynamic range of the new system had increased 20 times compared with that of the system without the auto light control. The new method satisfied not only the requirment of the wide dynamic range, but also the fast speed, the real-time, and the good adaptability.关键词：target tacking;large visual field;electronic shutter;stepless adjustment- 12
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发布时间：2020-08-12
Imaging Technology & Image Processing
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