最新刊期
期 5 ， 2013
- 摘要：Liquid crystal (LC) material used in organic semiconductor device is one of the areas of research focuses in recent years. This paper reports and reviews the semiconductor properties and applications in organic photovoltaic (OPV) of LC materials. The principles and device structure of OPV, and the basic knowledge of LCs are introduced. The research statuses of LC materials used as electron donor or acceptor in organic semiconductor devices are discussed. Meanwhile, as a semiconductor doping, the application of LC materials in OPV is also investigated. In conclusion, the ordered LC molecule is conducive to exciton dissociation and carrier transport as LCs is used as active layer material in OPV. When LC material is mixed into the active material of OPV, LC molecules will play a positive role in the crystallization process of the active layer. The doping of LCs in active layer can ameliorate the heterojunction interface and microstructure, and hence improve the efficiency of exciton dissociation and carrier transport capability. Both of the two aspects can effectively improve the power conversion efficiency of OPV. Finally, the development tendency in the future of OPV based on the LC material is prospected.关键词：solar cell;liquid crystal;order;induced crystallization;organic semiconductor
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发布时间：2020-08-12
Invited Paper
- 摘要：The phase transitions of liquid crystal system consisted by V-shaped molecules with dipole moments are studied in this paper. Based on a simple interaction energy between rigid molecules and interaction energy between dipoles, the phase diagrams in the plane of interaction strength between dipoles (v0) and temperature (t) are obtained by mean-field theory. Three types of phase diagrams in the plane of the angle (α) of the V-shaped molecules and temperature are also obtained. The results show that in the v0-t plane, decreasing temperature can make the isotropic phase entering into biaxial nematic phase by the first order transition, therefore Landau curve exists. In the α-t plane, the first type of phase diagram shows that, while v0 is relatively small, Landau curve does not exist. Yet, in the second type of phase diagram, where v0 is larger, only for appropriate interaction strength and in the appropriate range of values, can Landau curve exist. In the third type where v0 is the largest, the feature of the phase diagram is the opposite of the feature of the second type.关键词：biaxial nematic;phase transition;V-shaped liquid crystal molecules
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发布时间：2020-08-12 - 摘要：A novel series of bent-core molecules (mPEPK) was prepared with a central bent core based on 4,4-dihydroxybenzophenone (DHBP), ester group bridge(—COO—), and alkyl tails with different carbon numbers (m= 5, 6, 7, 8, 9, 10.). The structures of the titled compounds were confirmed by IR, 1H NMR, 13C NMR, MS spectra, and their transition temperatures and phase textures were investigated by using differential scanning calorimetric(DSC) and polarizing optical microscopy(POM). A part of the compounds exist smectic phase. Comparing with the similar compounds, the target compounds (m-PEPK) have declined to a great extent in liquid crystalline phase transition temperatures.关键词：bent-core liquid crystals;benzophenone;liquid crystalline phase;synthesis
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发布时间：2020-08-12 - 摘要：Polymer-stabilized cholesteric texture (PSCT) samples were prepared by means of polymerization induced phase separation. The electric property of PSCT can be improved by adjusting curing time, which results in the control of the elastic force between polymer networks and liquid crystal molecules. It was indicated that extending the polymerization time can improve the degree of polymerization of monomer, thereby enhancing the anchoring force of polymer networks, whereas has little influence on the morphology of polymer networks. In a normal-mode PSCT, polymer networks are arranged perpendicular to the base plate, which is conducive to the formation of a nematic phase induced by a electric field. With enhancing anchoring effect, low threshold (saturated) voltage, high closed transmittance, low contrast ratio, slow response, and big hysteresis width can be observed.关键词：polymer-stabilized cholesteric texture;electro-optic property;fast-response light shutter;curing time
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发布时间：2020-08-12 - 摘要：This work reports the CLC laser based on the combination of dye-doped CLC and a PC consisting of SiO2 and TiO2 multilayers, with the structure as 1D-PC/dye-doped CLC/1D-PC. The device exhibits two-mode laser action. The wavelength lasers are at 600 nm and 650 nm, corresponding to the short-and long-wavelength band edges respectively. In this system, the lasing threshold is much lower than that in simple CLC cell without the PC. Additio-nally, two-mode laser can be switched to single-mode laser by applying above 6 V voltage.关键词：laser;cholesteric liquid crystals;multilayer film
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发布时间：2020-08-12 - 摘要：4-(3,5-difluorophenyl)-2-methylbut-3-yn-2-ol is prepared with 3,5-difluorobromobenzene and 2-methyl-3-butyn-2-ol by the catalyzed of Tetrakis(triphenylphosphine)palladium. 3,5-difluorophenylacetylene is synthesized with 4-(3,5-difluorophenyl)-2-methylbut-3-yn-2-ol and potassium hydroxide in paraffin oil. Six fluoro-phenytolene compounds of liquid crystal were prepared by the alkyation of 3,5-difluorotolanes intermediates which were synthesized by the sonogashira reaction.These compounds not only have large optical anisotropy(Δn), but also have wider nematic phase temperature range by a series photoelectricity test and DSC analysis. These material can be used in TN,STN and TFT displays.关键词：fluorinated liquid cryscal;tolane;sonogashirs cross-coupling reaction
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发布时间：2020-08-12 - 摘要：Behavior of negative electron affinity (NEA) from B-doped diamond films is investigated. Largest secondary electron emission (SEE) yields were found to be 18.3 and 10.9 at 1 keV primary beam energy for samples doped with 10 mg/L and 2 mg/L B2H6/CH4 flow rate ratios, respectively. Note that these samples were left in air for weeks before loaded into SEE system, and subject to no treatment prior to SEE measurements. The higher SEE yields indicate that the NEA effect is well retained though the samples were exposed in air for weeks. Meanwhile,oxidation treatment of the sample doped with 10 mg/L B2H6/CH4 flow rate ratio in a boiled acid destroys NEA as evidenced from the lower SEE yields, whereas heating up in vacuum brings NEA back substantially, resulting in a largest yield of 10.2 at 1 keV.关键词：B-doped diamond films;negative electron affinity;secondary electron emission yield;oxidation treatment
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：High-resolution LCD is widely used in smart handheld device and electronic test equipment, and the design of its driver is becoming a hotspot in current research. The system architecture of electronic test equipments, such as digital oscilloscope, is usually based on FPGA&DSP. Therefore it has no dedicated processor serve for the LCD driver, and the traditional methods of LCD driver based on FPGA, is unable to meet the requirement of the refresh rate for its limited bus rate. To solve this problem, this paper describes a design of high-resolution LCD direct driving method based on FPGA-chip ODDR interface technology. The system is designed with FPGA as the core driver module, and DSP as the control module and the corresponding peripheral circuit. Processing display image with joining data together, it implements the driver and control of high-resolution LCD. Experimental results indicate that by modifying the frequency of line and field parameters of FPGA display module, the method is also suit to driver and control the multiple-resolution LCD with high reliability and easy to implement.关键词：high-resolution LCD;ODDR interface technology;FPGA
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发布时间：2020-08-12 - 摘要：Traditional infrared touch-screens cann't be used in complex environment and also cannot meet all the demands of users because of the difficult in accurate positioning multi-point touch, the low resolution and the slow response.The article puts forward the design of infrared touch-screen based on ARM(Advanced RISC Machines)Cortex-M3 kernel STM32F103 processor, constructed the system architecture and application.Full scan of using X axis and Y axis at both ends of the reverse greatly improves scan efficiency, as well as response speed. The angle scanning algorithm can position multi-point touch accurately.The tilt scanning uniaxial fixed-point algorithm can ensure that the infrared touch screen can work normally in complex situations such as in large obstructions.The design of the infrared touch screen with a standard USB port connect with the upper computer, so that it can widely be used in all kinds of terminal.关键词：infrared touch screen;multi-touch;ARM;angle scanning;tilt scanning
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发布时间：2020-08-12 - 摘要：A novel LED display was designed, using glass and PET as the substrate materials, respectively, and the non-flexible and flexible transparent LED display was produced. In the experiment, ITO thin film was used as the electrodes,which were made conducting path by laser-etching technology on different substrate. The SMD LEDs were chosen as the light source, adhered on the ITO glass through the solid crystal dispensing process. The production enables to display on the transparent medium and show the effect of double-sides transparent display.关键词：SMD LED;transparent display;driver circuit
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发布时间：2020-08-12 - 摘要：The reason for producing Zara particle in TFT-LCD manufacture process was studied. To solve this difficult point, the experimental tests and data analysis were carried out through macroscopic and microscopic inspection, scanning electron microscope, energy dispersive xray spectrom, etc. Two different viewpoints were put forward. The quality of product is improved by adjusting polyimide thickness, rubbing technological parameter and other measures. The ratio of Zara particle is reduced from 21.2% to 1.69%. Product yield has been greatly improved, and the above-mentioned results provide valuable data and theory basis for related issues in the future.关键词：TFT-LCD;Zara particle;polyimide;rubbing
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发布时间：2020-08-12 - 摘要：The relationship between LCD construction and Electrostatic Discharge(ESD) path was studied. Driver IC with the 2 kV ability for ESD generally, is the most easily damaged device when LCD attacked by ESD and the ESD charge is unable to disperse. LCD module can't work properly when drive IC was damaged. It is proved that additional device for ESD protect on the path of ESD circuit can conduct instantaneous current to ground to improve the ESD resistant ability of LCD module. A new method for additional electrostatic ring design on TFT substrate can instead of adding TVS tubes on FPC circuit, and this new design can be implemented without cost up.关键词：TFT LCD;ESD;short ring;transient voltage suppressors
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发布时间：2020-08-12 - 摘要：Edge Mura is always appeared in the vertical alignment LCD at high temperature condition. Adjustment and optimization of the seal spacer size and closing force are the common and feasible ways to improve the edge Mura. The experiments with different seal spacer size, closing force and glass type are done to improve the edge Mura. The improved perfor-mance of the edge Mura is verified by the visual check. And it shows the solution is effective.关键词：vertical alignment liquid crystal panel;high temperature performance;edge Mura
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发布时间：2020-08-12 - 摘要：In the trend of TFT-LCD display products, how to improve the quality of display is the main issue we commonly concern about, especially for the defect of black hole which was recently discovered and serious impact on product yield and reduce the quality. The main reasons of black hole were studied. To our surprised, active layer etching process was the main factor not the hole etch process, following with targeted trial design, the active etch condition and additional one step etch process were researched to solve problem. According to the experimental results of the additional one step etch, a solution to enhance product yield of about 3%~4% was found. The electronic parameter measurement was evaluated(Ion、Ioff、Vth、Mobility) and compared to the normal conditions without exception. Finally, a perfect solution was obtained. Therefore, the products quality was improved.关键词：active layer;etch;black hole
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发布时间：2020-08-12 - 摘要：LED micro-arrays apparatus has many outstanding characteristics, such as small bulk, high resolving power, long life, low wear out power and so on. Lighting output efficiency is an important parameter. The text made theoretic and experiment study for LED micro-arrays apparatus on AlGaInP wafer. The arrays apparatus image sizes is 100 μm×100 μm. Etching upper isolating groove with the deep width ratio was 25 μm :20 μm between adjacent light-emitting unit. Then filling the groove with mixed Si granule that has high reflect to 600~650 nm wave band into polyurethane. This hybrid materials can reflect lateral light to above surface, not only improve light efficiency of micro arrays apparatus, but also realize light and electric seclusion of two adjacent light-emitting unit. Theoretical calculation indicate that the multiple film can reflect each light-emitting unit the light of side-wall 16.695% to window layer, it improves lighting output efficiency availably. The study administers to the improvement of lighting output efficiency for LED micro-arrays apparatus.关键词：polyimide composite film;light output efficiency;reflectivity;micro-arrays
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发布时间：2020-08-12
Device Physics & Device Technology
- 摘要：Aiming at the difficulty to achieve both brightness and color gamut for CS-LCOS display system, this paper presented a new kind of driving method of RGB light source which the RGB driving duties were given according to their luminescence characteristics. Then it is found that under the premise of ensuring high color gamut, this method increased the display brightness, and greatly enhanced the display effect and practicality.关键词：LCoS;sequential color;light emitting diode;color gamut coverage
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发布时间：2020-08-12 - 摘要：Mobile Display Digital Interface(MDDI) is a high-speed serial digital interface standard, since it has many advantages such as less signal lines, higher signal transmission reliability, lower power consumption and the simpler circuits, it is widely used in the mobile display terminal. In order to meet the demand for higher resolution display, this paper proposes a novel design strategy for MDDI Type2 client data processing circuit which is used for the monolithic AM-OLED driver. In this design, the internal circuits are controlled with two-stage state machines, and the forward and the reverse link circuits are implemented separately which reduce the complexity of the circuit. And the circuit system supports sub panel control function. The paper completed the system architecture design and the Verilog coding. The synthesized results by Xilinx tools show that, this data processing circuit can support AM-OLED display with 480-RGB × 320 resolution and 26k color image data, the maximum frequency of the input data is 180 MHz.关键词：MDDI;client data processing circuit;AM-OLED driver IC;serial interface
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发布时间：2020-08-12 - 摘要：The traditional global dimming algorithm can not significantly improve the contrast and reduce power consumption. In view of this, a classification based on image global dimming algorithm is proposed. Using VHDL language in FPGA platform, this method is implemented according to the digital high-definition display timing logic and standard. This device can change 1 920×1 080 pixel HD video pixel data and backlight brightness at the same time, so as to significantly improve high-definition display resolution and reduce power consumption. Experimental results show that this device can meet the design targets, and have a good reliability,versatility, portability, and other characteristics.关键词：FPGA;pixel;image classification;contrast;power consumption
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发布时间：2020-08-12 - 摘要：An expert system based on CLIPS and VC2010 was designed in this paper. Written user functions in CLIPS, reveal the advantage of CLIPS language in the design of expert system as flexibility, portability, open source and etc., the CLIPS embedded in VC2010. Taking CLIPS as the carrier of knowledge base and inference engine of the expert system, written using VC2010 human-computer interaction interface, complete expert system diagnostic reasoning process and display the result, overcomes the weakness in CLIPS display of man-machine conversation interface not friendly. The expert system is easy to operate, can carry on reasoning and fault location based on fault phenomena of field personnel to provide.关键词：CLIPS;expert system;display
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发布时间：2020-08-12 - 摘要：On the basis of the MCU STC15F100, wireless data communication nRF905 chip and dot-matrix graphic LCD12864, the wireless voter system is developed in this paper. The design and the realize of hardware and software were presented. The system realizes the acquisition,deal and display of the voting information by the main master, voter, the liquid crystal display terminal and PC console software. Practice has proved that the system has a high value promotion and application in the enterprises and institutions for the reason which can meet the use for the democratic vote, and also has many advantages, for example, the high utilization, the low power cost, the high reliability and easy to install etc.关键词：communication protocol;data acquisition;wireless communication;wireless data transmission
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发布时间：2020-08-12 - 摘要：Based on the driving principles of thin film transistor liquid crystal display (TFT-LCD), an irregular LCD based on customized design was researched, the alignments of driving chips and the connection between the screen and chips were presented. The specialty of timing control was illustrated, and the timing controller of this irregular LCD was designed through FPGA. Based on the principle of Ping-Pong operation, internal data buffer and shunt in FPGA were implemented. In order to reduce EMI, improve the performance of the product, Reduced Swing Differential Signaling interface was designed based on FPGA. The display quality of static and dynamic pictures that displayed in this irregular designed LCD was showed in the paper.关键词：TFT-LCD;driving;FPGA;Ping-Pong operation;RSDS
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发布时间：2020-08-12 - 摘要：In order to meet the requirement of high definition, portability and remote operation of the video processing system, a high definition video processing system based on TMS320DM8168 SOC is designed and implemented. With the system, the HD-SDI video can be captured, compressed, stored in the hard disk, displayed on LCD and transmitted via the network. The paper gives a brief introduction on the hardware structure. The embedded drivers are explained in detail. In order to test the system performance, the frame difference, which is used to detect moving objects, is implemented on the system. The results show that the SOC system not only has met the requirement of high definition, portability and remote operation, but also has the advantage of simple design, good expansibility and flexibility, strong processing ability and reconfigurable operation arithmetic.关键词：TMS320DM8168;SOC;HDVPSS;HD-SDI;frame difference
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发布时间：2020-08-12 - 摘要：This paper presents a prototype online system for the visual inspection of steel toecaps. Using this system can not only reduce the labor intensity of workers, but also improve the inspection speed and accuracy. By analyzing the deform characteristics of the steel toecaps, an inspection method was put forward based on 14 important indexes of the 8 main deformation areas. The specific graphics algorithm was focused. The system performance was tested based on the Halcon software, and the influence of motion on measurement, error sources and their eliminating methods was analyzed.Experimental results show that the maximum error of the system is less than 0.2 mm and the missing rate of defective product is 0‰. The inspection accuracy is much higher than the manual inspection, and the average inspection speed is 213.71 ms,which is faster 3.5 times than manual inspection. The design of the steel toecaps online vision inspection system can meet the demand of industrial production.关键词：machine vision;steel toecaps;on-line inspecting;image processing
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发布时间：2020-08-12
Driving & Controlling
- 摘要：Because the hyperspectral image data are numerous, a hyperspectral image embedded system capable of real-time compression process is put forward. The system uses cyclone3 series EP3C16 FPGA coprocessor to complete the data cache, logic control, and control of the external interface.It's TMS320C6455 as central processor to realise real-time compression of hyperspectral image processing. The system has a high-speed characteristics,the experiments show that the image data with bandwidth of 1 024 byte×129 lines×12 bit×200 frames can be transported and compressed. Image after a real-time compression, transferred to the lower system through the ASI interface. The system has good stability, the structure has a scalable reconstruction characteristics.关键词：embedded system;hyperspectral compression;DSP+FPGA
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发布时间：2020-08-12 - 摘要：Photoelectric imaging systems are widespread observation tools used to fulfill various functions such as detection, recognition, and video-tracking. Laser countermeasures against imaging systems aim to saturate or damage the full camera image. In order to evaluate the dazzling effects of the laser and avoid such a disturbance, evaluation of laser-induced effects must be better understood. This paper propose a new algorithm composed of weighted wavelet structural similarity (WWSSIM), based on wavelet transforms and HVS property. Four-level 2D wavelet decomposition is performed for the original and disturbed images, respectively. Each image can be partitioned into one low-frequency subband and a series of octave high-pass subbands. Different subbands are processed with different weighting factors. Based on the results of the above, we can construct a modified WWSSIM. Comparison experiments show that the prediction accuracy and consistency of the proposed metric are respectively 5.2% and 4.1% higher than the PSNR index. The prediction accuracy and consistency of the proposed metric are respectively 2.9% and 2.6% higher than the SSIM index. In terms of experiment results,the new algorithm shows good feasibility comparing with MSE,PSNR and SSIM methods. WWSSIM is efficacious to reflect the laser dazzling effect.关键词：laser countermeasure;human visual system;wavelet transform;image quality assessment;structural similarity
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发布时间：2020-08-12 - 摘要：The imaging simulation system of infrared image sensor is the PC-DAQ system based on virtual instrument technology. The hardware of system was constructed with dri-ving circuit, BNC-2110 box, PCI-6115 acquisition card and PC computer. The control signals of image acquisition were made with external timing signals of driving circuit to control its sequence. These signals were used as acquisition's trigger and sample clock by programming the software. The serial voltage signals of infrared sensor output were acquired in computer. Then they were changed to the two-dimension spacial image signals, and the image was displayed on software screen by gray mapping. The feasible of system was validated with the association experiment. Using the system, developers can observe the real image quality of sensor, and it has the important reference value to the device's modification and design.关键词：infrared image sensor;imaging simulation system;virtual instrument
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发布时间：2020-08-12 - 摘要：By using Origin offset gain exponential function method, the traditional continuous zooming system for measuring the focal discretization sampling points was changed into nonlinear exponential points of continuous function. VxWorks continuous zoom and display controlling system was developed, which can efficiently modify the continuous zoom parameters. The issue of lower accuracy that is becoming continuous by traditional continuous zoom discrete sampling points is resolved, it is easy to realize by computer programming. The test analysis indicates that this display control technology is practical and reliable, the fitting credibility is more than 99%,true value proportion is more than the highest quantity to 93.6%,accuracy can meet the demand completely. This technology has been applied to the certain project successfully, and it is a good university and reference for the focal length of continuous zoom optical equipment formulation.关键词：Origin;VxWorks;continuous zooming;plus offset of exponent
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发布时间：2020-08-12 - 摘要：Based on the combination of Bayesian estimation and Shearlet transform, an algorithm for image denoising is proposed. In order to get Shearlet coefficients in all scales and directions, image with additive white Gaussian noise is processed by Shearlet transform. With the dependencies of the Shearlet coefficients, the new method select a proper neighbo-ring window by centering the current coefficient within it, and conclude the MAP expression and sub-band thresholds under Bayesian maximum posterior probability criteria when Shearlet coefficients is thought to have Laplace prior distribution, then made shrinkage on it by soft threshold. Inverse Shearlet transform is performed to the processed coefficients and get the denoised image. The experimental results demonstrate that compared with traditional wavelet domain denoising algorithms, the proposed method not only improves peak ratio of signal to noise but also have a remarkable visual effects.关键词：bayesian estimation;Shearlet transform;image denoising
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发布时间：2020-08-12
Imaging Technology & Image Processing
- 摘要：Key indicators of autostereoscopic display,including crosstalk ratio, color temperature, color gamut, and resolution are characterized. Measurement results show that the full high definition autostereoscopic display prototype, which is produced in the 3D display laboratory, can maintain the definition of 1 920×1 080 pixel in both 3D and 2D mode. The luminance of the prototype can reach 258 cd/m2 and the color temperature is 5 686 K.The color gamut is 70.83% in a standard of NTSC.The crosstalk ratio in the viewing zone is as low as 3.62%.关键词：full-high resolution;glasses-free autostereoscopic display;crosstalk;resolution
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发布时间：2020-08-12 - 摘要：Carrier mobility is an important parameter for semiconductor materials, however, the low carrier mobility of the organic materials limits the applications of some conventional methods in these materials. In this paper, the time-of-flight (TOF) experiment system is developed to measure the carrier mobility of organic materials. The role and requirements of each component in the experiment system and the key technical parameters of the experiment are introduced. The main feature of the experiment system is that a laser is employed as an excitation light source at the same time as the external trigger mode, to eliminate the disturbance from stray signal and get a clear signal. The carrier mobilities of the inorganic material Se and the organic conjugated polymer material MEH-PPV were characterized by this experiment system, which confirmed it is rational and success. Experimental results show that our experiment system could be set up fast and conveniently in measuring the low carrier mobility of organic materials. It will be valuable for practical applications.关键词：TOF;carrier mobility;Se;MEH-PPV
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发布时间：2020-08-12
Testing Theory & Technology
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