最新刊期
期 3 ， 2016
- 摘要：Organic light-emitting diodes (OLEDs)have become important technologies of display and lighting, which not only achieve applications in industry, but also obtain deep studies in science. It is related to chemistry and material science, also includes the scientific contents of physics, optics, electronics, device physics, condensed physics and semiconductor physics, etc.. This paper will introduce the physics basis and design principle of high efficiency OLEDs in device structures based on work mechanism and related materials, and finally prospects the applications of OLEDs in display and lighting.关键词：Organic light-emitting diodes (OLEDs);display;lighting
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发布时间：2020-08-12
Invited Paper
- 摘要：In order to improve the display quality of TN mode TFT-LCD product, Zara domain must be resolved which is a common defect. This paper talks about the 30% ratio Zara domain defect of 3.97 in TN mode TFT-LCD product with 235 PPI. Experiments show that the main factor influencing Zara domain is the matching of design and cell process & materials. First of all, we increase the thickness of OC to improve the CF side plainness. Second, we chose high pre-tilt angle PI ink & low pitch LC materials. Finally, the rubbing strength parameter & cooling ratio was adjusted. With suitable experiment conditions, good matching of design and cell process & materials, the display quality was largely improved, which Zara domain ratio is less than 1%.关键词：Zara Domain;PI&LC materials;rubbing process;quickly cooling
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发布时间：2020-08-12 - 摘要：Polymer stabilized blue phase liquid crystals (PS-BPLC) have attracted a considerable amount of attention because of their application to information display and photonic technology. PS-BPLC exhibit several attractive features, such as reasonably wide temperature range, sub-millisecond gray-to-gray response time, no need for alignment layer, and optically isotropic voltage-off state. After reviewing recent progress in monomers stabilizing blue phases, we describe their electro-optical performance. Molecular structure of monomers, the concentration of monomers, use of cross-linker and their influence on PS-BPLC were the main topics of this review. A more detailed discussion was emphasized on the influence of varied structure in the monomers including the introduction of fluorine atoms, chiral center and methylation of end-alkene. Furthermore, some advanced concepts in material design for PS-BPLC were presented.关键词：polymer;stabilized;blue phase;monomer
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发布时间：2020-08-12 - 摘要：The diamine 4-(((tetrahydro-2H-pyran-2-yl)oxy)methyl)-4', 4″-diaminotriphenylamine (THP) containing triphenylamine group and pyran ring was successfully prepared. A series of polyimides (PIs) were synthesized with the copolymerization of THP, 4, 4'-Oxydianiline (ODA), 4, 4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) by chemical imidization. The structures and properties of the PIs were characterized by NMR, FT-IR, DSC, and UV-Vis etc. It was found that all PIs were soluble in polar solvents, such as N-methylpyrrolidone (NMP) and N, N-dimethylformamide (DMF) and even soluble in some common organic solvent with low boiling point such as Tetrahydrofuran (THF) and Trichloromethane (DCM). The glass transition temperature (Tg) of the PIs was above 270℃, and their transmittance in 500~800 nm wavelengths was more than 80%. It can be observed under POM that the liquid crystal could be aligned uniformly and a pretilt angle of about 2.3° can be obtained by using the PI films as liquid crystal alignment layer.关键词：polyimide;solubility;heat-resistant;liquid crystal alignment;pretilt angle
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发布时间：2020-08-12 - 摘要：The calcium oxide doped magnesium oxide composite dielectric protective film was fabricated by electron beam evaporation. The influence of the fabrication temperature for the secondary electron emission of the composite dielectric protective film is studied. The experimental results show that the film processed by elevated temperature will be more compact, the grain size increases. The luminous efficiency will be improved and the transmittance of the film will be increased. When the processed temperature is 300℃, the formation of the composite film is more dense, the work gas voltage margin raises from 25 V to 32 V, the luminous efficiency increases from 1.70 lm/W to 1.91 lm/W, which is improved by 12.35%.关键词：MgO;dielectric protective film;secondary electron emission
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发布时间：2020-08-12 - 摘要：Image-retention has always been a problem in the TFT-LCD production process, especially for the TN production, and already had a great influence on the production yield of the products. This article mainly discussed the three aspects which had the influence on the incidence of image-retention including product designs, process parameters and the process control. The results showed that the main reason of image-retention is the oversize of segment difference at both sides of the Data line during product designs. And it was found that image-retention could be reduced by increasing the alignment film thickness and the rubbing torque value. No image-retention occurs when the alignment film thickness and the rubbing torque value are higher than 110 nm and 5.5 N·m, respectively. It can lower the image-retention by controlling the ITO overlay and controlling the PI-Rub delay time in 5 h, Rub-Assy delay time in 10 h to reducing the internal electric field of panel. As for 15.6HD products, the yield increased by 10% through the above measures which might lay the foundation of high-efficient production for enterprises.关键词：image-retention;twisted nematic;alignment weak area;internal electric field
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发布时间：2020-08-12 - 摘要：ITO(Indium Tin Oxide) is the most common transparent conductive film in the process of TFT(Thin Film Transistor). With the development of OLED, ITO has been widely used as the transparent anode. Due to various factors, the a-ITO film which thickness is more than 70 nm is easy to make residues during wet etch process. The residues seriously affect the product quality and project schedule. Based on many different thickness test, the factors of affecting residues was analyzed in the technical process. At the same time, the key factors and influence laws were found out. The result can be a good reference for the future technical process experiment.关键词：TFT;a-ITO;residual;sputtering;etch
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发布时间：2020-08-12 - 摘要：Generally speaking, the instability of TFT is caused by two key points: the defect of the semiconductor in channel, and the charge trap inside the gate insulating layer or between the channel layer and the gate insulating layer. During a long-time working of TFT-LCD, the leakage current will rise because of high temperature and light, which will result in a damage to the TFT-LCD. The recent research showed, that after the etching of channel, there are defect in channel and charge between the gate insulating layer and the channel layer. Because of its design, the ADS product faces a problem (the H takes place of the In of ITO during the H treatment), which will result in the precipitation of In. So the H treatment can't be used in the ADS production. Theoretical analysis shows that the Si-O bond is much more stable. This article showed a way to decrease the leakage current (in light and high temperature) by using a treatment which contains two steps(the Cl2/O2 treatment and the SF6/O2 treatment).The result shows a very effective improvement of the leakage current, after the treatment to the channel part, the leakage current decreases from 18.19 pA to 5.1 pA.关键词：high temperature and light leakage current;TFT channel;TFT characteristics;channel thickness
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发布时间：2020-08-12
Material and Device
- 摘要：In order to reduce the power consumption of the TFT-LCD, some methods were studied in this paper. These methods include pixel structure, drive method, circuit design and backlight drive based on the 11.6 HD, 14 HD and 14 FHD. First, the influence of pixel structure on power consumption is studied which use different pixel structure (dual Gate+normal pixel structure and dual Gate+Z inversion pixel structure) under a variety of pixel driving method. Second, the influence of pixels load and pixel driving signal which include Gate and source drive signal on power consumption is studied. Finally, power consumption between PWM dimming and mix-mode dimming at the same BLU is compared. The result shows the pixel structure, pixel loading and driving method have great influence on power consumption. For example, dot inversion will add 38.5% than column inversion in power consumption at 14HD product. When data load rose 10%, there is about 8% of power consumption added. When the VGH increase about 1 V, there is 1.35 mW power added. Mix mode dimming can decrease power about 2%~15% than the traditional PWM dimming under different brightness. Therefore, the optimization design of these methods can effectively reduce the power consumption of TFT-LCD.关键词：TFT-LCD;low power;driver method
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发布时间：2020-08-12 - 摘要：In order to strengthen and improve the basic hardware design ability of electronic technology enthusiasts and electrical class, a LED digital voltage meter of directly current is designed in this paper, which is composed of whole hardware circuit without programmable control. The designing and analyzing method of the sub module is used to design and simulate every module according to the system debugging order on the EDA platform of Proteus. These modules are separately A/D conversion module, clock module, shift counter module(binary to BCD conversion module), start and reset module and LED display module. The system design task requirement is realized by designing and simulation on Proteus and by actual circuit welding and debugging with modules. This kind of voltmeter has the advantages with low measurement error, low cost and easy to carry and so on.关键词：digital voltmeter;full hardware;sub module design;LED display;Proteus simulation
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发布时间：2020-08-12
Driving and Controlling
- 摘要：The mainstream methods of image-based 3D reconstruction are overviewed. The advantages and disadvantages of these methods are analyzed. A new 3D-reconstruction method is put forward; it is based upon a single image of an unstructured environment. For each small homogeneous patch in the image, a Markov Random Field (MRF) is used to infer a set of ‘parameters’ that contain both the 3D location and 3D orientation of the patch. The space is assumed being made up of many tiny planes, and each plane corresponds with a super-pixel. For each super-pixel in the image, a series of characteristic vectors such as color and texture are calculated. The relations between different planar parameters, as well as between super-pixel vectors and planar parameters are probed by using the MRF model. The MRF is trained via supervised learning. The scene is reconstructed based on the planar parameters. This algorithm does not require explicit assumptions about the structure of the scene, and compared with previous methods it enable us to gain more detailed information about the 3D structure. Using this approach, we have conducted checking computations for 200 pictures, among which 60% have been correctly 3D reconstructed.关键词：3D reconstruction;superpixel;MAP;supervised learning
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发布时间：2020-08-12 - 摘要：To eliminate smear effect of star image taken by CCD drift scan mode, a self-adapting fast smear elimination algorithm is proposed after analyzing image mechanism. On the basis of even gray level distribution of background, smear effect can be removed by calculating and fitting gray mean of pixels in every column and determining adaptive threshold value. After processing star image taken by real-time synchronous satellite positioning system, the size of the star image is 1528×1528, the experiment results show that mean deviation of background is apparently reduced and the precision is promoted, the consuming time of the method is only 20% of median filtering and multi-threshold setting method's, which proves validity.关键词：smear;background fitting;trail elimination
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发布时间：2020-08-12 - 摘要：A color separation method based on gamut space subdivision with interpolation was proposed to improve the precision of the color conversion model for multi-color printer's inverse spectrum characterization. Firstly, the algorithm combined gamut partition theory with cell space division method to find the cell space of the target color. Then, the cell space was subdivided by using spectrum Neugebauer equation, and the interpolation point's channel signal which met the threshold requirement was regarded as the final output values. The experimental data of the tested color samples showed that the algorithm had high accuracy with the mean color differences of 1.013 NBS. New algorithm could realize the accurate conversion of the multi-color printer from spectral data to channel-signal values.关键词：space subdivision;spectrum Neugebauer equation;color subarea;look-up table
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发布时间：2020-08-12 - 摘要：In order to obtain accurate aerial stitching images, a new algorithm combined with Binary Robust Invariant Scalable Keypoints (BRISK) and cross-correlation template matching algorithm is proposed in this thesis. There are some errors in the splicing translational direction on using traditional BRISK algorithm in image mosaic. Aiming at the problem, the BRISK algorithm is firstly used for the scale and rotation correction of the matching images. Then the template matching method is used for the translation correction. Meanwhile, the random sample consensus (RANSANC) algorithm is added to the BRISK algorithm to achieve precise mosaic. The experiment results show that the proposed algorithm has short operation time, high precision, and can achieve good image mosaic results.关键词：image mosaic;BRISK feature;Ransanc algorithm;template matching
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发布时间：2020-08-12 - 摘要：According to the phenomenon that the peak signal to noise ratio is low and the root-mean-square error is high corresponding to the reconstructed fusion image based on the regional gradient method and the regional energy method, this paper proposes an improved compressive sensing image fusion algorithm based on both gradient method and regional energy method. Firstly, a orthogonal wavelet transform matrix should be constructed, and we should use wavelet transform to make image sparse. Secondly, hadamard matrix is used as the measurement matrix to get measurement value of sparse signal, and then gradient values and energy values are calculated corresponding to the measured values. Thirdly, we fuse the measurement values according to absolute value method and weighted average method. Finally, image is constructed according to the measured value of fused. The experiments results show that this algorithm can obtain better effect of image fusion compared to single regional gradient method or regional energy method.关键词：compressive sensing;image fusion;regional gradient;regional energy
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发布时间：2020-08-12
Display and Image
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