最新刊期
期 3 ， 2009
- 摘要：Polymer light-emitting display (PLED) made by ink-jet printing has attracted considerable attention due to its simple process and low cost. In this article, the current situation related to ink-jet printing PLED,including development of PLED panels, printing equipments and printing technique, has been reviewed.
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发布时间：2020-08-12
Invited Paper
- 摘要：Modes of formation, features of molecular alignment and optical properties of chiral nematic liquid crystals are briefly introduced in this paper. Recent developments in the chiral nematic liquid crystals with characteristics of broad-band reflection are discussed in detail. Different methods to obtain the unusual pitch distribution in the chiral nematic liquid crystals polymers or polymer stabilized chiral nematic liquid crystals are summarized. Furthermore, prospects for their potential application are analyzed.关键词：liquid crystal;chiral dopant;chiral nematic;selective reflection;pitch;polymer network
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发布时间：2020-08-12 - 摘要：Based on the model of biaxial nematic liquid crystals, the Landau point in the biaxial nematic liquid crystals was determined by using bifurcation theory and two-particle cluster theory. The mole-cular biaxial parameter dependent curves transiting from istropic phase to uniaxial nematic phase were obtained. At the Landau point, the results of molecular biaxial parameter λ obtained from bifurcation theory, two-particle cluster theory and mean field theory were the same, but the results of reduced temperature t were different. The reduced temperature obtained from two-particle cluster theory was more accurate. The result of two-particle cluster theory was more reasonable than those obtained from the other two theories. The results demonstrate that it is necessary to consider the short range correlation between each pair of neighbor molecules.关键词：biaxial nematics;Landau point;bifurcation theory;two-particle cluster theory
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发布时间：2020-08-12 - 摘要：Within the framework of the effective-mass approximation, this paper presents a three-dimensional study of the exciton in ZnO/MgxZn1-xO vertically coupled quantum dots (QDs) by a variational approach. The strong built-in electric field due to the piezoelectricity and spontaneous polarization is considered. Our numerical results show that the exciton binding energy, the QD transition energy and the electron-hole recombination rate are reduced monotonically when the dot height and the barrier thickness between the coupled wurtzite ZnO QDs are increased.关键词：coupled quantum dots;exciton binding energy;transition energy;recombination rate
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发布时间：2020-08-12 - 摘要：Polyimide (PI) was widely used as alignment agent of TET-LCD because of its excellent advantages, while 4-BDAF was a key intermediate of alignment layer used for PI preparation. A new synthesis method of 4-BDAF was studied and the reaction conditions were optimized in this research. The results showed that optimal reaction conditions were: the molar ratio of hexafluroacetone, phenol and catalyst was controlled to be 1 ∶ 2 ∶ 2; methanesulfonic acid was chosen as the catalytic dehydrant; the reaction temperature was 155 ℃; and the reaction time was 11 h, respectively. The yield of 4-BDAF was 57%. The quality of the purified products could be equal to that from companies overseas. However, the price was competitive. And the technology could be industrialized easily.关键词：alignment agent;polyimide;4-BDAF;material ratio
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：The assembly process of LCOS-cell which had been developed by authors was introduced,and a curves based on testing data was given to estimate the time required to achieve the cell gap by applying different pressures on the cover substrate, at same time SEM photograph of cross section of the LCOS-cell was shown.关键词：LCoS;assembly process;cell-gap;aligning-mark
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发布时间：2020-08-12 - 摘要：The conditions, specialties and mechanism of amorphous Si and SiGe films crystallization induced by Ni and Al were analyzed systematically. Advantages of metal-induced crystallization over other crystallizing techniques and its application in thin film transistor fabrication were briefly introduced. And some influencing factors on crystallization velocity as well as the microstructure of the films, such as thermal process conditions and external electric field and etc, were recapitulated. Also, problems existing in electric field-aided metal-induced lateral crystallization were discussed. It was demonstrated that there exists a critical electric field strength, below which, the velocity of metal-induced lateral crystallization increases remarkably with the increase of field strength, while above which the velocity will decrease instead. This phenomenon can be interpreted fairly well in terms of electromigration effect.关键词：metal-induced crystallization;metal-induced lateral crystallization;solid phase reaction;diffusion;electric field aided lateral crystallization;nucleation activation energy;grain coarsening
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发布时间：2020-08-12 - 摘要：Zinc oxide (ZnO), an important Ⅱ-Ⅵ semiconductor, has potential applications in short wavelength optoelectronics. Ion implantation is a conventional technique widely used in semiconductor industry. This paper summarized the developments and applications of ion implantation in fabrication of n- or p-type ZnO, etc.关键词：ZnO;ion implantation;doping
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发布时间：2020-08-12 - 摘要：A novel 8 domain driving technology, which had the feature of low circuit cost for VA mode TFT-LCD panel was proposed. Based on the feed through effect in TFT-LCD pixels, pixel A and pixel B can get different driving voltages by turning on/off TFTs using scanning signals with different gate shaping waveforms. Compared with the complicated conventional TT-type driving method which needs 2 sets gamma voltages to get different voltages for pixel A and pixel B, the circuit of the new driving method is simplified because it only need 1 set gamma voltage. The simulation result proved that 8 domain driving can be realized at different gray voltages, and the pixel structure neednt modify because TFTs in pixel A and pixel B turn on at same time, so that it have enough time to charge liquid crystal capacitors in comparison with conventional TT-type.关键词：vertical alignment;8 domain;gate shaping voltage;feed through
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发布时间：2020-08-12 - 摘要：According to the requirement of special space environment, the key techniques for liquid crystal display in space was studied, the multifunction optical window, liquid crystal display (LCD) heater, white LED backlight and optical film assembly for LCD were designed and analyzed. The detailed technical requirements of surface anti-reflectance, electromagnetic shielding, low temperature startup, high luminance backlight, ideal display effect and high reliability for space LCD were achieved.关键词：ruggedized liquid crystal display;anti-reflectance;electromagnetic shielding;heater;backlight
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发布时间：2020-08-12 - 摘要：PDLC films are prepared by means of polymeriztion induced phase separation(PIPS).The electro-optical properties of PDLC films are influenced by many factors,which include cure temperature,ultraviolet intensity,different monomer materials and so on.These factors are mainly investigated.It can be found that the refractive index between admixture monomer (the mass ratio of Bi-EMA-2(A) and EHMA(E) is 1 ∶ 9) and liquid crystals (C70/02CN) is matched, and the grain boundary of LC droplets and monomer is distinct by polarized microscope. Meanwhile, cure temperature and ultraviolet intensity, which can maintain dynamic balance of the process of phase separation, are very important factors of arts and crafts. The intensity of temperature and ultraviolet directly influence on the LC droplets morphologies and uniformity of them in the phase separation, thus affect the performance of PDLC filmsE-O properties. In this text, the PDLC film provided with low-threshold voltage 0.18 V/μm and low saturation driving voltage 0.4 V/μm is finally prepared by optimizing the arts and crafts.关键词：polymer dispersed liquid crystal;phase separation;morphologies;threshold voltage
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发布时间：2020-08-12 - 摘要：The structural, optical and electrical properties of indium-tin oxide (ITO) thin film grown on inflexible glass and flexible polyethylene terephthalate (PET) substrates by magnetron sputtering method were investigated. High quality polycrystalline ITO thin films without phase-segregation were obtained on both substrates. The FWHM of (002) diffraction peak is 0.24° and 0.28° for ITO thin film grown on glass and PET substrate, respectively. ITO thin films grown on different substrate both showed high transmittance ratio and high conductivity. The transmittance ratio is 92% and 87%, the conductivity is 4.2×10-4 Ω·cm and 4.7×10-4 Ω·cm for the thin film grown on glass and PET substrate, respectively. It is believed that high quality ITO thin film can be grown on flexible substrate by magnetron sputtering method, and the quality of ITO grown on flexible substrate is comparable with that grown on inflexible substrate.关键词：indium-tin oxide;magnetron sputtering;x-ray diffraction;transmittance ratio;resistivity
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发布时间：2020-08-12 - 摘要：ZnO films were grown on SiNx/glass substrate by the method of MOCVD. The qualities of the ZnO films were characterized by XRD and photo luminescence spectra. The results indicated that the full width at half height of XRD intrinsic peak is 0.176°, and there is only a peak at 381.1 nm in the PL spectra. Both results exhibit the preponderance of our ZnO films in their photoelectricity characteristics. A bottom-gate-type ZnO-TFT was constructed successfully, and the measurements show that the device has an obvious field effect performance and a favorable saturation characteristic.关键词：ZnO-TFT;ZnO thin film;XRD;PL
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发布时间：2020-08-12 - 摘要：An adaptive optics system integrated with a LCWFC and a Shack-Hartmann wave-front sensor (WFS) were used to correct the turbulence in horizontal direction. Firstly, the phase modulation characteristic of the wave-front corrector was measured. The result showed that it can reach the modulation of 1 wave length. Meanwhile, the linear curve between phase modulation and voltage was gained by Gamma correction. At last, this system was combined with a 220 mm diameter telescope. After correction, the wavefront error was reduced to 0.06λ and the diffractive limits 0.68″ was also reached. The result shows that this system can corrected the turbulence effectively.关键词：liquid crystal wave-front corrector;atmosphere turbulence;phase modulation
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发布时间：2020-08-12 - 摘要：The fabrication technology of a novel planar field emission backlight unit (FE-BLU)applied to LCD was introduced,which was different from the traditional tubular ones. The carbon nanotubes (CNTs) cathodes were prepared by screen-printing on elaborate Ag electrodes and sealed into a prototype of a 25.4 cm(10 in) FE-BLU after CNTs had been chemical modified. Then high pressure airflow with organic solvent was adopted to improve the properties of field emission. The morphology of CNT and cathodes were investigated by transmission electron microscope (TEM) and scanning electron microscope (SEM). The results showed that the field emission current density of CNT cathodes was raised evidently, and the fabricated prototype exhibited outstanding properties with high brightness of 5 860 cd/m2, uniformity of 82% and without significant emission attenuation during 35 h .关键词：carbon nanotubes;field emission;backlight unit
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发布时间：2020-08-12 - 摘要：The connotation and the application in the semiconductor and FPD production industry of non-contact air-suspended movement technology were introduced. The non-contact air-suspended movement technology principles including air float and suck float were explained. The important questions in the non-contact air-suspended movement technology and the solutions were discussed. The development foreground of the non-contact air-suspended movement technology was analyzed.关键词：non-contact air-suspended movement;semiconductor;FPD;manufacture equipment
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发布时间：2020-08-12
Device Technology & Physics
- 摘要：A low power buffer amplifier for TFT-LCD driver is presented.Based on Class AB output stage,aided with Class B output stage, this amplifier can driver large capacity loads with low power to meet setting time requirement.Based on 0.15 μm CMOS process,the quiescent power of this buffer amplifier is 40 μW,and the setting time of 1% precision is 7 μs at 20 nF capacity loads.关键词：CMOS;LCD driver;buffer amplifier;low-power;Class AB output stage;Class B output stage
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发布时间：2020-08-12 - 摘要：Constituent parts of ANDON system, display scheduling software, communication protocol, the construction of embed ethernet network interface are illuminated. Display template mapping method, which can realize re-edit of content, format or layout of display information, is presented to give solution to promote compatibility and adaptability of the display scheduling software. SoC-based display control scheme is presented, which gives high efficiency development to the design. And,100M embed ethernet network interface and display data transport protocol are designed, which realize more effective transportation of display information.关键词：ANDON system;display scheduling software;SOPC;communication protocol
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发布时间：2020-08-12 - 摘要：The principle and design method of rotating flat display screen based on mechanical scanning are presented, and the homogenization algorithm of image is also presented with the inhomogeneous problem of pixel distribution considered. The simulation result shows that rotating flat display screen based on mechanical scanning using only a row of LED makes the same effect of normal matrix display panel, it can reduce the LED pixel utilized, and cut the cost of LED display screen.关键词：LED display screen;mechanical scanning technology;homogenization algorithm;intelligent control
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发布时间：2020-08-12 - 摘要：The SDRAM controller was designed which is applied in LED display control system, the whole system achieved a 256×64 pixels real-time display control, and used XILINX's FPGA- XC3S250E as the vector hardware. The use of dynamic memory which has the high frequency, low cost and space excellences breaks the limitation of static RAM. The controller was prepared by VHDL language, the core part is composed of the state machine, and the introduction of reading and writing modern methods improved systems bus utilization, systemic and universal performances.关键词：LED display control system;SDRAM controller;FPGA;VHDL
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发布时间：2020-08-12
Driving & Controlling
- 摘要：Adopting Xilinx XCS400 as the key chip, a data acquisition system was designed and implemented based on 485 communication protocols for a costumed IRFPA detector. There were three major parts in the system: IRFPA driving circuits, analog to digital conversion circuits and data transformation circuit, all of these systems were verified in software and hardware level. The images were quantized in 10 bits and the data throughout was 25.6 Mbits/s. The experiment results proved that the requirements of following conclusion analysis and experiments could be satisfied using this system.关键词：infrared focal plane array;data acquisition;field programmable gate array
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发布时间：2020-08-12 - 摘要：Auto-stereoscopic display means that the observers can obtain 3D images only using naked eyes, without any other assistant devices. This paper introduced the system using LEDs as the illumination to implement the stereo display for multi-users. Based on the LCD display, Fresnel lens was used to control the path of the LED light which was responsible for the parallax images. Cooperated with the head tracking programme, the LED arrays can offer the exact light to different observers independently. So the observer can see the right-left images and the gain the 3D images. The system uses Fresnel lens with the focal length of 930 mm,sets the light source 839 mm back from the LCD. Then we can get free view areas at the distance about 490~550 mm before the LCD display.Based on the optic angle enlarging structure, the stereo view angle can be up to ±30°,responding time of the system is less than 30 ms.关键词：auto-stereoscopic;multi-user;Fresnel lens;LCD;LED
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发布时间：2020-08-12 - 摘要：Using the contrast matrix model, the multinomial fitting, the three dimensional look-up-table and the neural network method separately, the color space non-linear correspondence relationship was established,which demonstrated that CRT monitor equipment color space RGB has nothing to do with the equipment, and the color characterization of the equipment was completed. Two common CRT displays were tested,and color difference was analyzed. The precisions of several methods were compared.The test results showed that the bound of chromatic aberration was placed in the middle, the polynomial regression had a low accuracy, the three dimensional look-up-table and the artificial neural network procedures could be used to characterize commonly used color CRT, and the artificial neural network procedures had better accuracy.关键词：tone matrix;multinomial fitting;look-up-table;neural network;color difference
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发布时间：2020-08-12 - 摘要：In order to improve the veracity of the PDP motion artifacts simulation, based on human visual system and the characteristic of the PDPs real luminance response curves, a simple and precise simulation method is proposed to calculate PDP dynamic false contour directly by the measured temporal response curves. Some actual evaluation of the motion artifacts in PDPs are presented.关键词：LCD;PDP;temporal response curve;motion artifacts;dynamic false contour
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发布时间：2020-08-12 - 摘要：An automatic collimation method based on CCD sensor was presented in this article. Using the vernier calipers scale line, the practical collimation line was simulated. The dislocation enlarge principle and multiple datum points were participated in collimation at the same time. Median filtering and morphological operator were combined to obtain the binary edge map.By fitting straight-line equation by least square method and calculating average distance, the collimation position was identified.The experiment result showed that this method can accurately identify the aligned lines, the positioning accuracy can reach micron grade,and has a certain practical value.关键词：high precision collimation;median filtering;morphologic edge detection;least-squares fitting
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发布时间：2020-08-12 - 摘要：Lamps based on multi-LED combined have being used more and more widely. Such lamps can be manufactured not only by packaging multi-LED in one unit, but also by distributing many packaged LED individual lamps on print circuit board(PCB) directly. The two approaches decide the difference in lamp structure, heat transmission capability, maintenance, and so on. The connection methods of LEDs affect directly the current balance between different LED serials. Several different driver designs are discussed in this paper in order to insure the consistency of different LED serials. Furthermore, one kind of heat transmission scheme based on epoxy print circuit board has experimented, which can achieve the same effect as PCB based on aluminium.关键词：multi-LED combined;luminaire;driving;heat conducting
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发布时间：2020-08-12
Imaging Technology & Image Processing
- 摘要：Using Arrhenius model and Eyring model, the reliability properties of LCD electrode corrosion were studied by corrosion acceleration experiments of LCD electrode with thermal stress & humidity stress, and a typical verifiable LCD life was derived. The results showed that corrosion velocity of LCD electrode was index function of thermal and humidity. That means, LCD products pass the reliability test at 55 ℃×95% RH×24 h, corresponding at least 3 years of product life at room temperature. In addition, the relationship between corrosion failure ratio of LCD products and time was discussed at 40 ℃×70% RH & at room temperature, respectively. More than 95% potential corrosion failure products can be selected at 40 ℃×70% RH×48 h.关键词：LCD;corrosion;reliability;temperature stress;humidity stress
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发布时间：2020-08-12
Test & Evaluation
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