最新刊期
      期 10 ， 2018

        Material and Device

      • Ke-jun ZHONG,Yan-jun FU,Guang-yu JIANG
        Vol. 33, Issue 10, Pages: 823-830(2018) DOI: 10.3788/YJYXS20183310.0823
        摘要：A cone-shaped microstructure array was designed on the OLED substrate in order to improve the luminous efficiency of OLED. By means of geometrical optics and ray tracing method, the influence of the surface structure on the luminous efficiency is analyzed. Analysis shows that the maximum luminous efficiency is increased to 60%. Parameters of cone-shaped microstructure array such as duty ratio, the refractive index of the cone microstructure and the slope angle have great effect on the light efficiency. The cone microstructure arrays do not change the radiation angle of OLED, and has concentration function. Results provide a new reference and method for improving the luminous efficiency of OLED.  
        关键词：OLED;luminous efficiency;cone-shaped microstructure array;ray tracing   
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        发布时间：2020-07-06
      • Chang-jian XU,Shun-sha LU,Guo-jing MA,Dan WANG,Jin-yu REN,Bo ZHOU,Yong-zhi SONG,Wei-tao CHEN,Sha FENG
        Vol. 33, Issue 10, Pages: 831-835(2018) DOI: 10.3788/YJYXS20183310.0831
        摘要：In large generation LCD factory, Inkjet printing is widely used for PI (Polyimide alignment film) material coating, due to convenient product switching and high capacity. As the technology upgrading, such as high PPI, Borderless etc., the challenges of novel PI Mura occurred in inkjet printing process. We research a kind of peripheral PI Mura in this paper. In Pre-cure process, PI solution was accumulated much near the peripheral via Hole of array glass, leading to larger inhomogeneous film thickness, which caused the edge dark line mura. We research the process conditions of PI pattern position, Pre-cure temperature, Pre-cure air pressure and PI Thickness. The results reveal that extending edge of PI pattern, lowering Pre-cure temperature, reducing the air pressure and thinning the film effectively decrease accumulation near the peripheral via hole, and induce the defect-free and excellent display  
        关键词：LCD;polyimide film;inkjet printing;via hole;pre-cure   
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        发布时间：2020-07-06
      • Sheng-guo TANG,Chun-lei DONG,Zi-yuan LIU,Hai-feng XU,Hai-xia XIANG,Zheng-yuan ZHANG,Peng SUI,Yong MA,Man ZHAO
        Vol. 33, Issue 10, Pages: 836-843(2018) DOI: 10.3788/YJYXS20183310.0836
        摘要：This paper reports the extruded white spot (EWS) of BLU and the associated caused reasons, and studies the impaction of the height of local convexity on back cover and the roughness of reflector film on EWS. The results show that the incidence of EWS significantly reduces with the decrease in the height of local convexity. Under the best back-pressure process, the mean value of local convexity decline from 0.21 mm to 0.11mm. Accordingly, the incidence of EWS declines from 50% to 18.7% during THO & VIB accelerated tests. The anti-EWS ability of reflector film is obviously improved with the increase in roughness. There is no EWS occurred, when the roughness is 6.29 μm together with using back-pressure back cover.  
        关键词：extruded white spot;thin and slim BLU;beads coating;reflector film;back cover   
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        发布时间：2020-07-06
      • Xiao-ping LI,Wu-sheng HU,Ming-huan LIU,Yong-gang LIU,Li XUAN
        Vol. 33, Issue 10, Pages: 844-850(2018) DOI: 10.3788/YJYXS20183310.0844
        摘要：We report the effect of distinct LC orientations on LC/polymer grating electro-optical properties and lasing emission. The volume grating configuration was observed successfully by observing the cross section using a Scanning Electron Microscope. The diffraction efficiency decreased from 83.2% to 72% and the scatterings increased from 11.8% to 19.1% when LC changed the orientation from parallel to perpendicular to the grating vector because of worse morphology. The tuning electric field decreased from 13.6 V/μm to 3.1 V/μm when LC changed the orientation from parallel to perpendicular to the grating vector. The lasing threshold was lower when LC was parallel to the grating vector, which was helpful to lasing emission. The work in this paper provides guidance to the physical insights of LC/polymer grating and dye-doped distributed feedback lasing emission.  
        关键词：LC/polymer grating;LC orientation;tuning;distributed feedback   
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        发布时间：2020-07-06
      • Gui-xing LIU,Hai LIN,Wei-xiu PANG,Yan-bing WANG
        Vol. 33, Issue 10, Pages: 851-856(2018) DOI: 10.3788/YJYXS20183310.0851
        摘要：Based on the theory of the optical Jones matrix, the grating diffraction of the nematic liquid crystal TEB30A doped with Sm2O3 is studied in the weak magnetic field. The results show that when the natural light passes through the sample of the proper proportion of Sm2O3/TEB30A in the weak magnetic field, the diffraction stripes appear in the far field. And the diffraction stripes will change dynamically with the increase of the intensity of the external magnetic field. The reason for producing the diffracti  
        关键词：Sm2O3;nematic liquid crystal TEB30A;natural light;weak magnetic field;grating   
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        发布时间：2020-07-06
      • Chun-yang WANG,Lan-ting LI,Hong-wei SHI,Qi-feng NIU
        Vol. 33, Issue 10, Pages: 857-863(2018) DOI: 10.3788/YJYXS20183310.0857
        摘要：As a novel programmable phase modulation device, the liquid crystal phased array can realize beam deflection in a small angle range. However, due to the influence of manufacturing process, temperature and atmospheric disturbances, there is a certain error between the actual and the expected deflection angle of the beam deflection system. In order to make beam deflection more accurate, this paper proposes a closed-loop control loop for beam deflection based on fractional-order-controller. As the detection el  
        关键词：liquid crystal phased array;beam deflection;fractional-order-controller;control   
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        发布时间：2020-07-06
      • Xiao-jin LI,Qiang CHEN,Wei ZHENG,Ye-zhou FANG,Yan-zhao Peng,Yong-sheng LI,Zhi-gang CHEN,Jian-yun XIE
        Vol. 33, Issue 10, Pages: 864-869(2018) DOI: 10.3788/YJYXS20183310.0864
        摘要：Based on IPS (in-plane-switching) liquid crystal display mode, a new type of optical alignment technology is adopted, which has the advantages of non-static, pollution-free and controllable pre-inclination. But at the same time, there is a bad image sticking, which has obviously influence on product yield and customer feeling. This article has prepared three polyimide materials and formed orientation layer with optical alignment technology. Firstly, the characteristics of polyimide materials were studied, i  
        关键词：optical alignment;image sticking;ammoniation rate;anisotropy   
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        发布时间：2020-07-06
      • Wang HU,Li SONG
        Vol. 33, Issue 10, Pages: 870-876(2018) DOI: 10.3788/YJYXS20183310.0870
        摘要：Liquid crystal materials provide different responses to changes of external physical quantities, such as electric field, heat, magnetic field and light, and liquid crystal composites with certain response characteristics can be prepared by adding compounds with certain properties. Composite materials with information recording function can be prepared based on the prepared liquid crystal composites with responses to electric field changes. Chiral ionic liquid was synthesized. By proportionally adding the sy  
        关键词：information recording;liquid crystals;reflection   
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        发布时间：2020-07-06

        Image Processing

      • Chun-zhe WANG,Jun-she AN,Xiu-jie JIANG,Jie LI,Yu-feng ZHANG
        Vol. 33, Issue 10, Pages: 877-883(2018) DOI: 10.3788/YJYXS20183310.0877
        摘要：Due to the problem of poor consistency between objective score in nonlinear regression and subjective scores, a multi-distorted image quality assessment method based on sparse representation and SOM is presented in this paper. Firstly, the reference image and the multi-distorted image are represented sparsely by independent component analysis, and the structural similarity index between the reference image and the distorted image under the sparse representation is computed to describe the quality of multi-d  
        关键词：image quality assessment;multi-distorted images;sparse representation;clustering;cross-validation   
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        发布时间：2020-07-06
      • Tao LIU,Feng QIAN,Bao ZHANG
        Vol. 33, Issue 10, Pages: 884-892(2018) DOI: 10.3788/YJYXS20183310.0884
        摘要：The fundamental purpose of remote sensing is to obtain clear images with high spatial resolution, which can be further analyzed and processed. In order to obtain higher spatial resolution, higher signal-to-noise ratio and clearer images in remote sensing measurement, this paper studies the superresolution algorithm in image processing field. In the paper we set up a model fitting the real imaging system, use the theory of maximum a posteriori probability system on this model, discuss the motion blur, noise   
        关键词：MAP principle;superresolution reconstruction;remote sensing;Markov random field;dynamic constraint;regulation item   
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        发布时间：2020-07-06
      • Le LUO,Qian CHEN,Hui-dong DAI,Guo-hua GU,Wei-ji HE
        Vol. 33, Issue 10, Pages: 893-900(2018) DOI: 10.3788/YJYXS20183310.0893
        摘要：In order to eliminate the noise interference in the sampling process and to further improve the quality of reconstructed images, a compressed sampling imaging method based on Hadamard matrix encoding measurement is proposed to reduce the signal to noise ratio of the Digital Micro-mirror Device (DMD) and the bucket detector in the measurement process. First, using the DMD zoning control method, the rough image of low resolution is obtained by the Hadamard coding measurement. Then, the important region of the  
        关键词：compressed sampling;hadamar matrix;wavelet coefficients;digital micro-mirror device   
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