最新刊期
      期 6 ， 2017

        Invited Paper

      • Peng-fei ZOU,Bing-yan WEI,Shu-lei YANG,Xiao LIANG,Guo-fei CHEN,Kuan CHEN,Yan-qing LU,Wei HU
        Vol. 32, Issue 6, Pages: 411-423(2017) DOI: 10.3788/YJYXS20173206.0411
        摘要：In recent years, photoalignment technology has become a dominant alignment technique in liquid crystal fields. In addition to the flat panel displays, photoalignment has also been widely used in nondisplay fields. The review briefly introduces a photoalignment patterning technique based on a polarization-sensitive azo-dye agent and presents its application progresses in nondisplay fields including liquid crystal optical switches, special optical field modulation, depolarizer, terahertz waveplates, the manipulation of the cholesteric liquid crystal helical axes and so on.  
        关键词：liquid crystals;photoalignment technology;nondisplay   
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        发布时间：2020-07-07
      • Bin MU,Ke-yang CHEN,Dong-zhong CHEN
        Vol. 32, Issue 6, Pages: 424-432(2017) DOI: 10.3788/YJYXS20173206.0424
        摘要：We present a systematical investigation on the synthesis, molecular characterization and liquid crystalline phase behaviors of a series of triphenylene (TP) acrylate intermediates. Based on different reaction activity of variant length of polymethylene spacer, several synthetic protocols have been successfully employed for introducing an acrylate group to the TP core via polymethylene spacer with the methylene number from 0 to 10. The obtained polymerizable TP acrylate intermediates were confirmed by nuclea  
        关键词：discotic liquid crystal;triphenylene;acrylate;columnar plastic phase;hexagonal columnar mesophase   
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        Device Technology

      • Jia-xiang ZHANG,Yan-qiang WANG,Kai LU,Wen-yu ZHANG,Feng-tao WANG,Xin-you JI,Liang WANG,Jie ZHANG,Qi WANG,Kun LIU,Liang-jie LI,Jing-peng LI
        Vol. 32, Issue 6, Pages: 433-437(2017) DOI: 10.3788/YJYXS20173206.0433
        摘要：TFT character of the Mo/Al/Mo as TFT-LCD source/drain was studied. Compared with the single Mo, the channel interface was rougher and Ioff was larger. Through the optimization of the structure of membrane layer and the interface state, good TFT character and smooth channel interface were received. Increasing the thickness of bottom Mo could effectively reduce the penetration of Al, and prevent the formation of Al-Si compounds to get the smooth channel interface. SF6 treatment after N+ etching had no influen  
        关键词：channel interface;Ioff;Al electrode;TFT character   
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      • Yu WANG,Bo-ying LI,Ling-hui PEI,Zhi-xin FAN
        Vol. 32, Issue 6, Pages: 438-442(2017) DOI: 10.3788/YJYXS20173206.0438
        摘要：Scattering polarizer is a new type of translucent optical film which has a slight haze. When incident light is unpolarized, half of the light is transmitted, while the other is scattered. This scattering polarizer has application prospects on a transparent projection screen, but has not been industrialized yet. In this paper, the method of dry stretching polyvinyl alcohol doped liquid crystal (PVA:LC) was used to prepare scattering polarizer. First, we prepared polyvinyl alcohol doped liquid crystal aqueous  
        关键词：dry stretching method;scattering polarizer;PVA:LC;transparent projection screen   
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      • Yun-xiao ZHONG,Yu XIE,Shang-xiong ZHOU,Wei-jian YUAN,Mu-yang SHI,Ri-hui YAO,Hong-long NING,Miao XU,Lei WANG,Lin-feng LAN,Jun-biao PENG
        Vol. 32, Issue 6, Pages: 443-454(2017) DOI: 10.3788/YJYXS20173206.0443
        摘要：In recent years, solution method for electronic device print fabrication has garnered increasing interest and attention due to their green, low-cost, simple process, flexible and good adaptive, particularly in high-performance oxide semiconductor thin film transistor in flat panel display and consumer electronics industries. This review reported latest progresses of print oxide semiconductor TFT including structure optimization, semiconductor layer material, electrode layer material, insulating layer material and associated precursor selection. The relationship between device stability and post-treatment is described clearly, and the key of performance promotion is found. Moreover, several personal insights on the existing challenges and future research direction of print oxide semiconductor TFT are considered based on current advances.  
        关键词：solution processes;oxide semiconductor thin film transistor;print fabrication;precursors;post-treatment   
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        Material Science

      • Shuai-min JIAN,Yang XIE,Gao-fei XIA,Lu-biao SUN,Wei-xin MENG,Che SHEN,Jian GUO
        Vol. 32, Issue 6, Pages: 455-460(2017) DOI: 10.3788/YJYXS20173206.0455
        摘要：At present, Thin Film Transistor Liquid Crystal Display (TFT-LCD, Thin-Film Technology Liquid Crystal Display) has become the mainstream in the field of Display products, and LCD panel is an important component of TFT-LCD. LCD edge light-leaking can cause image distortion, affect the visual effects, resulting in lower quality display screen and yield, thus improving the edge light-leaking become an urgent problem to be solved. This paper studies the influence of the abnormal orientation of liquid crystal an  
        关键词：TFT-LCD;edge light-leaking;LC pattern;Si-Ball   
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      • Qiu-hong CUI,Yan-bing HOU
        Vol. 32, Issue 6, Pages: 461-466(2017) DOI: 10.3788/YJYXS20173206.0461
        摘要：Organic semiconductors have received much attention from both industry and academia, due to their potential opto-electronic applications. Solution-process ability is one of their most attractive features. The other component of an organic semiconductor material's molecular structure is its π-conjugated backbone, which plays an important role in determining the extent of π-π stacking and charge mobility. In our work, two conjugated molecules were selected to understand how molecular shape impacts the crystal  
        关键词：conjugated molecules;self-assambly;mobility;field effect transistor   
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      • Hai-cheng WEI,Ya-jie XU,Ming-xia XIAO,Wen-xin JI
        Vol. 32, Issue 6, Pages: 467-473(2017) DOI: 10.3788/YJYXS20173206.0467
        摘要：In this work, the direct precipitation method was used to generate magnesium salt Mg(OH)2, the process of preparing MgO crystal by calcining Mg (OH)2 in three stage temperature was studied, and MgO crystal was characterized by scanning electron microscope and XRD. On this basis, the energy band structure and states density of MgO crystal were calculated by the first principle theory, the influence of crystal orientation on MgO secondary electron emission was analyzed. The experimental results show that the MgO prepared by this method is cubic crystal. The grain size is evenly distributed in the vicinity of 40.65 nm. The crystal orientation is of (200), (111), (220) and along the (200) orientation preferential growth. Among three kinds of common crystal orientation which are (110), (110) and (111), the surface (110) orientation of the MgO crystal with the lowest band gap, the two electron emission coefficient of the material surface is relatively high.  
        关键词：MgO crystal;secondary electron emission;first principle theory;direct precipitation method   
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        发布时间：2020-07-07

        Image Processing

      • Na YANG
        Vol. 32, Issue 6, Pages: 474-481(2017) DOI: 10.3788/YJYXS20173206.0474
        摘要：In view of the present chaotic image encryption algorithm based on scrambling-diffusion, it exists in the process of pixel position scrambling vulnerable to choose plaintext (ciphertext) attack, we put forward a image encryption algorithm based on genetic-super chaotic. This algorithm introduces the explicit feedback mechanism to the image scrambling process. Its scrambling effect is not only related to the initial sequence of chaos, but also closely related to the plaintext itself. Therefore, it implements  
        关键词：hyperchaos;image encryption;genetic algorithm;image scrambling;image diffusion   
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      • Jun-shan LI,Ya-wei YANG,Zi-jiang ZHU,Jiao ZHANG,Yao-hua DENG
        Vol. 32, Issue 6, Pages: 482-490(2017) DOI: 10.3788/YJYXS20173206.0482
        摘要：The video/image received by optical system suffers degradation such as pixel deviation, blurring and signal to noise ratio reduction, when the target detector flies at high speed in the atmosphere is affected by turbulent interference. In this paper, the complexity of turbulence-degraded image restoration and deblurring methods are studied, and a video restoration method based on non-convexity optimization and dynamical adaptive filtering method is proposed. Firstly, we study the sum and deblur framework of  
        关键词：atmospheric turbulence;video restoration;point spread function;non-convexity   
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      • Xin HUANG,Zhang LIU
        Vol. 32, Issue 6, Pages: 491-498(2017) DOI: 10.3788/YJYXS20173206.0491
        摘要：The method proposed in this paper is different from the traditional road lane detection algorithm. Firstly, LDA(Linear Discriminant Analysis) is used to convert road images to gray images directly, increasing the difference between the lane and the road. Secondly, the road lane is fitted by parabola model, and CPSO(Chaos Particle Swarm Optimization) is applied to optimize the parameters of parabolic model. The CPSO fitness function consists of features of grayscale and gradient. After several iterations, the optimal parameter value of parabola can be obtained, and then the road lane in the image can be detected out. Experiment results show that the proposed algorithm could detect road lane in complex environment. Also, it has a good performance on road lane tracking in the video frame sequence.  
        关键词：lane detection;LDA;chaos particle swarm algorithm;parabolic fitting   
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      • Yun TIAN,Wen ZHEN,Hai-jun ZHAO
        Vol. 32, Issue 6, Pages: 499-505(2017) DOI: 10.3788/YJYXS20173206.0499
        摘要：The accuracy of gaze tracking largely depends on the quality of images, but additional constraints and large amount of calculation make gaze tracking impractical on high-resolution images. Our aim is to get the accurate localization of pupil center on low-resolution image. To this aim, we proposed a simple but effective method which can accurately locate pupil center in real time. The method first gets initial eye center based on improved SIFT descriptor and SVM classifier, and then gets final position of the pupil center through a size variable correction rectangular block. In this paper, comparing with the reported state-of-the-art methods, the experimental results demonstrate that our system can achieve a more accurate result on low-resolution images, the precision of positioning result in the pupil area was 87.32%.  
        关键词：pupil center localization;classification;SIFT feature;correction rectangular block   
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