最新刊期
      期 11 ， 2016

        Material and Devic

      • Yu-qiang GUO,Yi-fei Wang,Jian-Long LIU,Sen WANG,Hong-mei MA,Yu-bao SUN
        Vol. 31, Issue 11, Pages: 1017-1022(2016) DOI: 10.3788/YJYXS20163111.1017
        摘要：In order to protect the LC and devices with high operating voltage, the thicker thickness of the alignment layer is used. When the thickness of the alignment layer can not be neglected, the increasing of the alignment layer's thickness leads to the increasing of the operating voltage. The influences of the thickness and dielectric constant of the alignment layer on LCD are researched in simulation and experiment based on twist nematic liquid crystal display (TN-LCD. The results show that the operating voltage can be reduced effectively when the dielectric constant of the alignment layer is larger than 20, a little effect of the various thickness on the operating voltage can be seen when the dielectric constant is larger than 500. The result has an important significance for reducing the operating voltage of liquid crystal device with high operating voltage.  
        关键词：LCD;alignment layer;dielectric constant;operating voltage   
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        发布时间：2020-08-12
      • Ling-li ZHANG
        Vol. 31, Issue 11, Pages: 1023-1032(2016) DOI: 10.3788/YJYXS20163111.1023
        摘要：Cholesteric liquid crystal is an interesting and fascinating chiral supermolecular system, which has self-assemble helical alignment. In recent years, there are many excited research results about cholesteric liquid crystal, especially photo-tunable cholesteric liquid crystals. In this work, the development of photo-tunable cholesteric liquid crystals applications have been reviewed in these years in this paper. The application of photo-tunable cholesteric liquid crystal in special optics device will be a potential research fields.  
        关键词：cholesteric liquid crystals;photo-tunable;filter;grating;lasing   
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        发布时间：2020-08-12
      • Xiao-wei LIU,ming TIAN,Liang-liang LI,Yan-qiang FU,Hui-bin Guo,yao LIU,Jian-feng Yuan
        Vol. 31, Issue 11, Pages: 1033-1037(2016) DOI: 10.3788/YJYXS20163111.1033
        摘要：A new unknown block mura of large size TFT-LCD has been studied in this paper. The mura was observed by SEM, Four-probe tester and Spectrophotometer. It is caused by the periodic changing of TFT metal line thickness. The periodic changing of metal line thickness led to the changing of LCD cell gap, influencing display quality of TFT-LCD. The periodic changing metal line thickness is caused by adopting the structure of a kind of flat target magnetron sputter equipment, which is used in large size TFT-LCD production line widely. The thickness uniformity of metal line was improved by modifying the equipment structure. The mura disappeared after the thickness uniformity is improved.  
        关键词：large size TFT-LCD;magnetron sputtering;flat target;Mura   
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      • Jin-gui LIU,Yin XIAO,Ying-chun SUN
        Vol. 31, Issue 11, Pages: 1038-1045(2016) DOI: 10.3788/YJYXS20163111.1038
        摘要：To prepare a kind of polyimide (PI) solution with self-alignment function, and avoid producing disadvantage effect (static electricity, particle, alignment error, etc.) on alignment layer with rubbing process, a series of polyimides with different solution viscosity were used to research the relationship between PI solution viscosity and its surface roughness. Meanwhile, the relationship between the surface roughness of PI alignment layer and pretilt angle(θp) of liquid crystal was also studied. The results  
        关键词：liquid crystal alignment layer;polyimide;surface roughness;pretilt angle   
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        发布时间：2020-08-12
      • Yi WANG,Ping ZHANG,Sheng-xiu WU,Wu-jun QUAN,Jian-tao LI,Ya-jun LIU,Yuan-yuan SUN,Tong ZHAO
        Vol. 31, Issue 11, Pages: 1046-1054(2016) DOI: 10.3788/YJYXS20163111.1046
        摘要：The EI mass spectra of two kinds of liquid crystals alkylcyclohexylbenzene derivatives and alkylcyclohexylbiphenyl derivatives were analyzed with the gas chromatogram/mass spectrometer, and the fragmentation rules of them were summarized in this paper. The EI mass spectra in analogy with the Alkylcyclohexylbenzene derivatives and alkylcyclohexylbiphenyl derivatives, abundant molecular ions are presented in all the spectra. They have three most characteristic ions, the odd electron ions at m/z100+R2+R3+R4+R5[m/z 175+R2+R3+R4+R5+R6] and their satellites the even electron ions at m/z 87+R2+R3+R4+R5 and m/z 113+R2+R3+R4+R5[m/z 162+R2+R3+R4+R5+R6、m/z 188+R2+R3+R4+R5+R6] in the mass spectra.  
        关键词：liquid crystals;GC/MS;fragmentation mechanism;alkylcyclohexylbenzene;alkylcyclohexylbiphenyl   
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        发布时间：2020-08-12
      • Jing-si JIANG,Qiang LI
        Vol. 31, Issue 11, Pages: 1055-1063(2016) DOI: 10.3788/YJYXS20163111.1055
        摘要：In order to take proper energy saving measures in design, building and running of TFT factory and reduce energy consumption of the TFT device production effectively, this article takes the method of comparative analysis, by summarizing the energy consumption data of typical TFT-LCD and AMOLED production lines designed by CEEDI, analyzes how device structure and production technics impact the energy consumption in device production. The result shows that TFT array is the most important energy consuming proce  
        关键词：TFT-LCD;LTPS;IGZO;AMOLED;comprehensive energy consumption;energy consumption per unit product   
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        发布时间：2020-08-12

        Driving and Controlling

      • Hai-yang ZHU,Ming-xing OUYANG,Jun-wu ZHANG
        Vol. 31, Issue 11, Pages: 1064-1069(2016) DOI: 10.3788/YJYXS20163111.1064
        摘要：Considering that traditional wired or wireless controlled LED dot matrix display screen is required for operational control on a Windows computer, the software operations are complex, delayed update and limited by the range of applications, this paper proposes a control strategy for dot matrix display screen based on Android control.Through building font, all 16-bit resolution Chinese character and non-Chinese character symbols based on GB2312 80 can be displayed, then the display context can be edited by using the APP software running on smart phone, updated instantly when being transferred to the LED controller to make a real display via Bluetooth. Started with a 16×64 basic display unit, this paper elaborates the software programming methods, it can extends to other isplay resolution size accordingly. Finally, a 32×64 display example is given.  
        关键词：matrix LED screen;font mod;resolution;real-time display;Android control   
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        发布时间：2020-08-12

        Display and Image

      • Han-zhou GUO,Li-hong GUO,You LV
        Vol. 31, Issue 11, Pages: 1070-1078(2016) DOI: 10.3788/YJYXS20163111.1070
        摘要：For the defect in describing object geometry features of SIFT at viewpoint variation, a new local feature extraction method is proposed in this paper, which combined maximally stable extremal region(MSER) and histogram of second order gradient(HSOG). First, a new most stability criterion is adopted to improve the detection effect at irregular shaped regions and under blur conditions. Then, the local feature descriptors of MSER is extracted by the improved histogram of second-order gradient; the influences o  
        关键词：signal process technology;MSER+HSOG;image match;local feature   
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        发布时间：2020-08-12
      • Shu-peng WANG,Hai-li ZHAO,Peng LIU,Zhi-gang LI,Guo-zhe QU,Bo SUN
        Vol. 31, Issue 11, Pages: 1079-1084(2016) DOI: 10.3788/YJYXS20163111.1079
        摘要：In order to quickly and accurately obtain the phase retardation characteristics of LCVR at different wavelength, based on the birefrigent effect of LCVR and the relationship between Stokes vector of transmission light intensity and phase retardation, light intensity method is used to measure the phase retardation characteristics of LCVR, that is the measurement of LCVR's phase retardation characteristics converted to the measurement of the transmitted light intensity and the LCVR's driving voltage. The LCVR  
        关键词：liquid crystal variable retarder;phase retardation characteristics;stokes vector;Labview   
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        发布时间：2020-08-12
      • Wen-hui ZHOU,Xiao-li SONG,Yu-hua CHENG
        Vol. 31, Issue 11, Pages: 1085-1091(2016) DOI: 10.3788/YJYXS20163111.1085
        摘要：Injection mold protection systems generally use template matching image processing algorithms, which have shortcomings of poor real-time, low accuracy, and stringent requirement of operating environment. This paper presents an embedded mold protection image processing algorithm based on wavelet passivation. This algorithm runs on an embedded platform and highlights residues using the wavelet passivation method without template matching, image registration and correction. A SVM(Support Vector Machine) detect  
        关键词：mold protection;image processing;wavelet passivation;SVM   
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        发布时间：2020-08-12
      • Yao-hui HU,Yi-ni REN,Piao DAI,Xing-yu MA,Yang WANG,Xiao-yu DING,Guo-qiang LV
        Vol. 31, Issue 11, Pages: 1092-1097(2016) DOI: 10.3788/YJYXS20163111.1092
        摘要：Ultra High-Definition auto-stereoscopic display technology with lenticular works well in the 2D model now, but the data for stereo synthesis increases sharply when the resolution is higher. In this paper, we propose a fast parallel algorithm using Single Instruction Multiple Data to solve real-time synthesis in the x86 architecture operating environment. The results show that it substantially increases synthesis rate compared to the general algorithm, faster than an order of magnitude. It effectively meets the need of real-time synthesis in Multi-view Auto-stereoscopic display technology and has certain practical significance.  
        关键词：auto-stereoscopic display;parallel processing techniques;single instruction multiple data command;Lenticular grating   
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      • HU Yao-hui,REN Yi-ni,DAI Piao,MA Xing-yu,WANG Yang,DING Xiao-yu,LV Guo-qiang
        Vol. 31, Issue 11, Pages: 1092-1097(2016) DOI: 10.3788/YJYXS20163111.1092
        摘要：

        Ultra High-Definition auto-stereoscopic display technology with lenticular works well in the 2D model now, but the data for stereo synthesis increases sharply when the resolution is higher. In this paper, we propose a fast parallel algorithm using Single Instruction Multiple Data to solve real-time synthesis in the x86 architecture operating environment. The results show that it substantially increases synthesis rate compared to the general algorithm, faster than an order of magnitude. It effectively meets the need of real-time synthesis in Multi-view Auto-stereoscopic display technology and has certain practical significance.

          
        关键词：auto-stereoscopic display;parallel processing techniques;single instruction multiple data command;Lenticular grating   
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      • Chang-lai GONG,Cong LUO
        Vol. 31, Issue 11, Pages: 1098-1104(2016) DOI: 10.3788/YJYXS20163111.1098
        摘要：In view of the problem that exists in the classic tolerance mechanism image haze removal algorithm, the efforts to enhance the transmission of the bright region is not enough, it is difficult to completely eliminate the color distortion, an improved algorithm is proposed herein. For the bright region transmission, according to the tolerance, hyperbolic type enhancement is adopted in the original algorithm, while linear enhancement correction is used in this paper, which makes the transmission enhance steadily. The effort to enhance the transmission is appropriately increased, thus the color distortion is effectively eliminated. Variance and color reduction degree are used as objective quality evaluation index for image haze removal. Compared with the dark channel prior algorithm and the classic tolerance mechanism algorithm, the proposed algorithm is superior to the contrast algorithms in improving the color distortion of the bright region and improving the image haze removal.  
        关键词：image haze removal;dark channel prior;transmission;tolerance mechanism;bright region   
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