最新刊期
期 4 ， 2009
- 摘要：Liquid-Crystal-on-Silicon(LCOS) microdisplay is a sort of display that operates in a reflective mode. And its perimeter-driver and active-pixel-matrix is fabricated on a silicon chip, which acts as substrate of the liquid-crystal-gap, using CMOS technology. So it has both small size in volume and high resolution for display. In this paper, the fabrication and application for LCOS display are described in detail, and real status for LCOS technology are shown.关键词：liquid-crystal-display panel;reflective;micro-projector;optic-engine
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发布时间：2020-08-12
Invited Paper
- 摘要：The electronic structures of the banana-shaped liquid crystal 1,3-phenylene bis benzoate were calculated with Hückel tight-binding method. The effects of the central core, the linkages and the alkyl tails in the two-branched legs of the banana-shaped liquid crystal were discussed. Among the six transitions outlined, only the two lowest energy ones (π→π*, n→π*) are often achieved by the energies available in the 200~800 nm spectrum. Energetically favoured electron excitation will take place at 4.0 (310 nm) and 1.7 eV (730 nm), respectively, for the studied molecule.关键词：banana-shaped liquid crystal;electronic structures;excitation;optical absorption
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发布时间：2020-08-12 - 摘要：A series of 2-amino-4-alkylphenol were synthesized by reduction of 4-alkyl-2-nitrophenol which was synthesized from alkyl-phenol. In the presence of polyphoshoric acid, 2-amino-4-alkylphenol reacted with alkyl benzonirtrile to yield 2,5-disubstuted benzoxazole, a series of liquid crystalline compounds were synthesized. The structures of products were calibrated, the parameters of liquid crystal were measured and the performances of liquid crystal were studied. Some of the products achieved mass production, good effect was obtained.关键词：benzoazole;liquid crystals;polyphoshoric acid
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发布时间：2020-08-12 - 摘要：Holographic polymer dispersed liquid crystal is a kind of novel photoelectronomic information functional device. In this study, effect of chemical structure of monomers on holographic polymer dispersed liquid crystal gratings was investigated from the morphology, the diffraction efficiency, the electro-optical tunable performance and ene-conversions, respectively. The results showed that, the chemical structure of monomers plays an important role in performance of H-PDLC gratings. A rigid molecular structure forms a clear morphology, high diffraction efficiency and low threshold voltage gratings than a flexible molecular structure. In addition, the rigidity ring increases interactions between molecules and restricts the motion between them, thus enhances the phase separation, electro-optical characteristics and ene-conversions. On the other hand, with the rigid structure of monomer material increase, making the volume of LC droplets become smaller, LC regional narrow, so the drive voltage was increased, however, there is still a drop than flexible molecules. Therefore increa-sing the rigid structure of monomer reasonably can improve the phase separation and electro-optical properties of HPDLC gratings.关键词：holographic polymer dispersed liquid crystal;phase separation;diffraction efficiency;double bond conversion rate
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发布时间：2020-08-12 - 摘要：Dendritic thiol is a kind of molecule with special functional group, which could be self-assembled on gold substrate and form nanometer strips on gold film with single crystal orientation. In this paper, a serials of brancded thiols were synthesised by using ether reaction. In the experiment, some different reaction route was carried out, the reaction efficiency was evaluated by HPLC method. A optimized reaction route was obtained. Furthermore, through computer simulation, the anchoring energy of this special film surface with nanometer strip was as large as that of conventional rubbing PI film.关键词：dendritic thiol;synthesis ether;liquid crystal
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发布时间：2020-08-12 - 摘要：Using(E)-2-(4-(diphenylamino)styryl)quinolato-zinc (TPAHQZn) as a hole-transporting emitter, a yellow OLED was fabricated with the molecular structure: indium-tin oxide(ITO)/ 4,4',4″-{N,-(2-naphthyl)-N-phenylamino}-triphenylamine (2T-NATA)(15 nm)/ (E)-2-(4-(diphenylamino)styryl)quinolato-zinc (TPAHQZn)(x nm)/9,10-bis(2-naphthyl)anthracene(ADN)(31 nm)/ tris(8-quinolinolato) aluminum(Alq3)((65-x) nm)/LiF(0.6 nm) /Al. By adjusting thicknesses of TPAHQZn, a yellow OLED was obtained which has the maximum luminous efficiency of 0.84 cd /A (at 10 V) and maximum luminance of 2 479 cd /m2 (at 14 V). The device emits pure yellow light efficiently and stably, the Commission Internationale De LEclairage (CIE) coordinates slightly varied from (0.502, 0.449 5) (6.346 cd/m2, at 8 V) to (0.497 9, 0.453) (2 479 cd/m2, at 14 V).关键词：organic light-emitting devices;TPAHQZn;luminance;efficiency;color stability
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发布时间：2020-08-12 - 摘要：The electron emission results in antiferroelectrics and ferroelectrics were compared and effects of the abstract field, the insulation layer on the electrode and the phase transition properties on the results of electron emission in antiferroelectrics are researched. More electrons were collected and higher current densities were obtained while the abstract field was higher. An insulation layer was coated on the electrode of the sample to prevent the discharge between the emission surface and the rear electrode so that the exerted field could be greatly enhanced and higher current density was obtained under this condition. Thus the maximum electron emission current density was increased to 153 A/cm2 in antiferroelectrics by these two method. The lower curie temperature due to the strong diffusion during phase transition and the semi-conductivity of the surface layer makes electron emission easier, thus a lower starting threshold of emission and a higher electron emission current density were observed in antiferroelectrics than that in ferroelectrics.关键词：antiferroelectric cathode;abstract field;insulation layer;phase transition;starting threshold of emission
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：Free energy that includes bulk elastic and surface parts has been theoretically simulated depending on surface topography. The critical conditions of the state transition from C1 to C2 have been determined. Based on this theory, the defect-free FLCDs with uniform alignment was successfully fabricated by means of using alignment layer RN-1199 which can provides a low pretilt angle of 1.8°.关键词：ferroelectric liquid crystal;zigzag defect;pretilt angle
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发布时间：2020-08-12 - 摘要：Exo-electronic emission from protective layer can improve the response time and stability of the discharge for PDP. Meanwhile, it also results in the loss of wall charge during the driving. This paper commented on the factors to effect the loss of the wall charge caused by exo-electronic emission and the ways to modify the wall charge accumulating, which provides directions to utilize optimally the exo-electronic emission performance.关键词：protective layer;exo-electronic emission;wall charge;PDP
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发布时间：2020-08-12 - 摘要：Using the screen-printing process, the large-area dot-matrix cathode addressing structure was implemented on the glass substrate with the stack type for the preparation of insulating layer and wiring layer. The triode field emission display (FED) sample was developed with carbon nanotubes as cathode materials. With the dot-matrix cathode addressing structure, the lightening-pixel could be point-to-point controlled directly, and the better image display was confirmed for the whole device. The FED could be controlled by the existing drive integrated circuit, and possessed better field emission characteristics and high display brightness.关键词：field emission;cathode;addressing;dot-matrix;carbon nanotube
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发布时间：2020-08-12 - 摘要：The doped ZnO film is a new type of transparent and conductive oxide (TCO) material which was widely studied by the researchers because of its potential candidate to replace the ITO. There are a lot of potential applications in the liquid crystal devices,solar cells,et al,due to its excellent electrical and optical properties. Compared to the previous works, the latest developments of the n-type and p-type ZnO semiconductors in the past two years were summarized and future works were indicated and discussed in this paper.关键词：ZnO;transparent and conductive;resistivity;transmittance
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发布时间：2020-08-12 - 摘要：Cr-Cu-Cr composite films were deposited on the surface of clean glass substrates by magnetron sputtering, and the fine thin-metal electrodes of large screen field emission display (FED) were fabricated by photolithography and wet chemical etching techniques. The influence of different etchants on the etching ratio of Cr film was discussed and the electrode image was observed by video microscopy and profilometer. It showed that the etching ratio of Cr film was steady and the electrode with less erosion was neatly in the mixture etchants of potassium permanganate, sodium hydroxide and water with the mass ratio of 6 : 3 : 100. In addition, the etching mechanism of FeCl3 etching Cu film was analyzed. The recurrent and quiescent etchants affected on the preparation of fine thin-metal electrode was discussed and measured by video microscopy. The result showed that the etching ratio of Cu film was symmetrical and the edge of electrode was tidy in the recurrent etchants.关键词：FED;large screen;fine electrode;wet chemical etching
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发布时间：2020-08-12 - 摘要：Low resistant metal is one of key factors in delay-time of large TFT-LCD. In this article low resistant metal aluminum has been investigated. After a-Si island etch process, it is found that remained Cl2 had eroded aluminum. This has severity influence on products. By optimizing the etch process, more active SF6 can remove remained Cl2 in a-Si island etch process. So aluminum erodibility can be avoided.关键词：thin film transistor;aluminum;erodibility;etch
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发布时间：2020-08-12 - 摘要：Effect of packing technology on the interconnection property of anisotropic conductive film (ACF) was discussed. The References showed that in the procession of packaging of ACF, pressure of discharge head, heat temperature and heat time have an important effect on the degree of curing. Moreover these parameters further affect the mechanical property, electric property and reliability of ACF. The appropriate packaging temperature is between 180 ℃ and 200 ℃, and the different packaging form has the optimal pressure. The resistance of ACF is minimal when the curing degree is 87%. When the curing degree is smaller than 50%, the probability of short circuit can reach 25%. The resistance of ACF increased as the offset improved. The shape of conductive particles has an important effect on insulation resistance caused by offset.关键词：ACF;packaging technology;curing degree;reliability
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发布时间：2020-08-12 - 摘要：According to the characters of video signal in form of VGA, the controller for LOCS field-sequential-color (FSC) display has been designed based on CPLD. Taking CPLD as the core, the design thought of Ping-Pong operation is adopted to harmonize the two pieces of SRAM to operate. In order to realize the FSC display, the series-parallel conversion makes the input video signal into three sub-fields signal—red, green and blue. The design scheme has decreased the refresh frequency. In addition, the whole design has been simulated using EDA tool.关键词：field-sequential-color;CPLD;SRAM;Ping-Pong operation
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发布时间：2020-08-12 - 摘要：Some important effects of viewing a laser scanned display (LSD) on visual perception was investigated. LSDs could provide a highly bright, monochromatic image which could have particular effects on the visual system. Participants accommodation was measured while they viewed an image on either a laser-scanned or video-projected display. Furthermore, monochromatic displays may affect perception as a result of chromatic adaptation. Color vision of participants was also assessed before and after using the displays. Increased variability of the level of accommodation was found when using the laser-scanned display, but the magnitude of the effect was mediated by how fast elements of the display were moving. The biggest difference in accommodative variance was between a video display with slow-speed scanning and an equivalent laser-scanned display. Viewing of the laser-scanned display also led to measurable changes in color perception in some participants. The experimental results showed that viewing a laser-scanned display affect the accommodation response and color perception.关键词：visual accommodation;laser-scanned display;color vision
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发布时间：2020-08-12 - 摘要：This paper researches the difference between tracepro simulation and human eyes observation in uniformity of LCD TV direct backlight. In order to make the simulation result reflects the true situation, the data simulated by tracepro was put into the formula that adapt to the human eyes observation, the Weber coefficient of each sampling point was calculated. Comparing with the vision’s Weber coefficient 0.017, it is determined whether or not there will be nonuniformity, then re-fitting the new graph of backlight uniformity. This can help the designer evaluate the product better in design step.关键词：Tracepro;sensory threshold;resolution
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发布时间：2020-08-12 - 摘要：ZnO-TFT was fabricated on thermally oxide silicon substrates by RF magnetron sputtering and lift-off technology. The effect of annealing temperature on electrical properties of devices was investigated which revealing that the threshold voltage decreased and the field effect mobility increased with the increase of annealing temperature. The surface morphology of the ZnO films were characterized by atomic force microscopy, which showed that the average grain size increased with the increase of annealed temperature. The results indicate that there are close correlation between electrical properties of ZnO-TFT and the grain size of the channel layer.关键词：ZnO;thin film;transistor;anneal
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发布时间：2020-08-12
Device Technology & Physics
- 摘要：The paper designed a virtual liquid touch panel using device-making tool of Proteus ISIS combined with 256×256 graphical liquid display, and applied it into tiny chess control system. Through the design and simulation of this embedded system, the making, synthesis and software design of virtual liquid touch panel were introduced in detail. The author tries to fill in the gap about liquid touch panel application design in Proteus of current version. The technology described in this paper is of universal guiding significance on design and application of various liquid touch panel based on Proteus.关键词：virtual liquid touch panel;tinny chess;keypad making;virtual terminal
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发布时间：2020-08-12 - 摘要：A kind of control circuits for Organic Light Emitting Diode (OLED) displays is designed. This system is suitable for 256×64 matrix display panel which contains 16 gray scale levels .The MCU of the system is C8051F020 and the driver IC is SSD1322.The display of words and static of image are available by using this circuit system, according to the characters of OLED and the function of SSD1322.A kind of making code software is used to make needful code. The sleep mode of OLED has implemented which is very useful in low power device.关键词：OLED;SSD1322;C8051F
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发布时间：2020-08-12 - 摘要：A design of real-time digital video transmitting system applied in LED screen remote display was presented, which converts the video signal from the DVI interface of PC to the Ethernet frame format for long distance transmission. The digital signal would be decoded and recovered from the frames, and would be suitable for remote display. Receiving module and control module was integrated in a circuit board, which can set the resolution and refresh rate flexibly. The cascade of receive-control modules was realized by RJ45 interfaces of gigabit Ethernet Hub, which removed the module used for receiving and transmitting data and reduced the complexity of the design. On the basis of actual demand for long-distance transmission, breaking the restriction that the longest transmission of 1000BASE-T is 100 m, a design of optical fiber converter of Ethernet was presented. Using single-mode optical fiber instead of 1000BASE-T, the transmission distance is up to 10 km. This design proposal has implemented real-time digital video transmission with reasonable display effects, providing reference to the various real-time digital video transmission systems.关键词：FPGA;optical Fiber;Hub;optical fiber converter of gigabit Ethernet
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发布时间：2020-08-12 - 摘要：The bus-stop reporting system was designed based on STC single-Chip CPU as the control unit from Hongjing Company, with LED point display-screen and solar power. On the display-screens, passengers could get such information as the different routes for different buses. It is very convenient for people to know which bus they should take or where to get off. It is also economical as the traditional electricity is replaced with the new energy-solar power in such a system.关键词：single-chip computer;LED point screen;storage battery;solar panel
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发布时间：2020-08-12 - 摘要：Compared with SRAM,DRAM saves chip area. This paper mainly introduce the design method of the built-in DRAM.The improved 3-T DRAM,saves the space and reduces the power consumption. The refresh circuit have been optimized,omitting the arbitration circuit. Combining the features of the chip, row decoder circuit and column decoder circuit are designed.Combining the simulation verification with form verification, the chip simulation is made. Meanwhile,the post-simulation is accomplished using the method of structure extraction of parasitic parameter and setting of circure path.关键词：TFT;DRAM;3T;simulation
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发布时间：2020-08-12 - 摘要：The design idea and implemented method of hardware and software of virtual liquid display screen has been discussed systemically with LCD LM016L being taken as an example. System software design adopts modularization design method to increase the readability of program. Because the whole design and interactive simulation of system hardware and software are built on the platform of Proteus ISIS 7.4, the design goal of virtual liquid display screen are realized successfully, exhibiting the superiority and convenience of software Proteus in MCU system design, shorting the design process and reducing the system design cost.关键词：virtual liquid display screen;embedded system;modularization design;character generator;interactive simulation
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发布时间：2020-08-12
Driving & Controlling
- 摘要：According to the characteristics of ST7920 LCD controller and dot-matrix LCD modules (KXM12864M), this paper draws the hardware interface circuit between ST7920 and single-chip. On the basis of Bresenham algorithm, the article adopts the calculation method which uses discrete integer increments instead of rate increments and proposes deduction process of optimization algorithm which can apply to MCU drawing operations. And then the painting line, round and other operations can be realized through the C programming language. The actual project results show that the optimization algorithm has simple and good-transplant characteristics. And it can offer a new approach for drawing other graphics on small and medium-sized instrumentation display equipments.关键词：LCD;Bresenham algorithm;difference comparison;drawing
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发布时间：2020-08-12 - 摘要：This paper presents a design method of image scaling engine based on different interpolation in rows and columns for the hardware complexity reduction of LCD scaler and the image quality improvement of the LCD display. Based on the introduction of 4-points cubic convolution and linear algorithm, the system architecture of scaling engine is presented. In this architecture, 4-point cubic convolution algorithm is used in the horizontal interpolation, and 2-point optimized linear algorithm is used in the vertical interpolation. Compared to the design based on Bicubic algorithm, nine multipliers are saved. It is obviously that the hardware complexity is reduced. Then, the scaling unit and corresponding filter is specially recommended. The design is mapped into a FPGA chip, and the FPGA verification results show that the design is feasible.关键词：image zooming;cubic convolution;LCD;scaler
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发布时间：2020-08-12
Imaging Technology & Image Processing
- 摘要：A measurement scheme for field emission display(FED) materials was provided, and a test equipment was designed to test the luminescence properties and temperature characteristics of the phosphor powder. Furthermore, the instrument could also be used for the life test of the phosphor powder because it could generate great excitation power. The data and results of the FED materials in the experiment were presented, and these experimental data and analysis could provide a foundation for the design of the FED apparatus, to make the important parameters be satisfied.关键词：FED;detection devices;light-emitting characteristics;life-test
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发布时间：2020-08-12 - 摘要：Three-stage driver principle is used in the electromotive waveform design of TFT LCD and verified by the experiment. In the proposed design, when gate voltage is closed, the Feed Through vol-tage of Cgd is compensated by the Feed Through voltage of Cs. The voltage of Cs is generated by the increase of gate voltage directly. Therefore, rectify of Vcom is unnecessary, then, the difficulty of extraction Clc parameter is avoided.关键词：TFT LCD;three-stage driver;testing waveform
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发布时间：2020-08-12
Test & Evaluation
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