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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Design and study of optical devices based on holographic polymer dispersed liquid crystal technology

    Jihong ZhengKen WenLingjuan GuSonglin Zhuang...
    356-362页
    查看更多>>摘要：Micro/nanoscale liquid crystal (LC) droplets are dispersed within polymer matrix, known as polymer-dispersed liquid crystals (PDLCs). LC molecules can be reoriented under an applied voltage, which makes PDLC-based devices have wide applications in optical communications, integrated optics, and panel displays, etc. In this paper, we summarized our work on holographic PDLC (H-PDLC) devices including variable attenuators, dynamic gain equalizers and focus-switchable lenses. More importantly, a specially designed H-PDLC chopper array was demonstrated, which will be applied in the new-born frequency division multiplexed high-speed fluorescence confocal microscope system.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    An easy way to make liquid crystal cells for laboratory uses

    Bao-gai ZhaiYuan Ming Huang
    363-366页
    查看更多>>摘要：We present an easy way to make liquid crystal cells for laboratory uses. It is demonstrated that a homemade LC cell can be made out of two pieces of ITO glasses, a tiny amount of glue and four tiny pieces of thin Mylar films as spacers. The flatness of the thin panels is evaluated with an ultraviolet-visible spectrometer by measuring the transmission spectra for a series spots on the homemade LC cell. Tests of our homemade LC cells filled with a banana-shaped LC show that the quality of our homemade LC cell is good enough for regular laboratory tests of newly synthesized LC compounds.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Investigation on two-dimensional photonic crystal self-collimation splitting sensor

    Yufei WangGuozhong LaiJianfeng ZhangFuzhong Lin...
    367-371页
    查看更多>>摘要：A self-collimation splitting sensor truncated in a two-dimensional (2D) photonic crystal has been proposed and demonstrated theoretically. Intensity of transmitted light and reflected light, which varies with the width of the splitter, is detected at two output ports. Calculation results validated by the 2D finite-difference time-domain technique show that with the increase of width, the transmittivity decreases while the reflectivity increases and their summation decreases. Considering the trade-off between the sensitivity of the optical detector and the loss of power, including the difficulty of fabrication, the width of 0.4a is meet for the sensor. The simulated relative intensity monotonously increases from 1.63 to 2.94 nonlinearly.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Features of printing and display

    Lu-hai LiYi FangZhi-qing XinXiao-jun Tang...
    372-378页
    查看更多>>摘要：The manufacture of display device is a complex technology. To reach the flexible display like E-paper, many manufacture process such as driving electrode circuit and transistor must be combined with printing technology. From the information reported, the application of gravure prints technology in organic electronics; off-set printing in EMI film and screen technology in circuit are summarized. The study was more about ink jet print technology. It was described that ink jet was used in OLED (Organic light-emitting diode), OTFT (organic thin film transistor), polymer solar cell/ Flexible organic photovoltaic cell and so on. An OE-A (organic electronics application) roadmap for the charge carrier mobility of semiconductors for organic electronics applications was given. To achieve the printed circuit, the nano silver conductive ink was applied and the ink jet circuit surface was tested by microscopy, the conductive and flexible silver film was with many advantages than screen circuit. It was concluded that the printing electronic will play important roll in the display development.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research on the line distortions and its causation for liquid crystals modules

    Ping-jun ZhangXin-hua Jiang
    379-382页
    查看更多>>摘要：According to the manufacturing procedure of liquid crystals modules (LCM), several display distortions of LCM, such as S line distortion, G line distortion, line short-circuit and cs-open are introduced. Combined with its internal structure and its working principle, key causes and repair methods of these distortions are focused on. The pass rate of the product is improved. A foundation has been laid on research in automated diagnosing systems which based on image processing and circuit parameter diagnosing technology.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Synthesis of small silicate spacers for ferroelectric liquid crystal displays

    Bao-gai ZhaiYuan Ming Huang
    383-386页
    查看更多>>摘要：In the presence of the aqueous solution of ammonia, tetraethyl orthosilicate (TEOS) was hydrolyzed in the mixture of ethyl alcohol and water with the results of silica spacers. The spacer morphology and size distribution of the synthesized silica spacers were characterized with scanning electron microcopy and laser light scattering spectroscopy, respectively. Our results demonstrated that the synthesized silica spacers were monodispersed and were in perfect spherical shape with their sizes of about 0.7 μm in diameter. The correlation between the spacer sizes and the amount of ammonia catalyst was examined, and the spacer sizes of the silica spacers strongly depended on the temperature of chemical reaction and the amount of catalyst. The diameter of silica spacers could be well controlled by controlling the amount of ammonia catalyst, and uniformly distributed silica spacers were produced. Behavior of the miscibility of the silica spacers with a nematic liquid crystal was examined.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Precision recycle module for digital-paper display using twins-cylinder tool

    P.S. Pa
    387-390页
    查看更多>>摘要：A new effective fabrication module was developed to mediate the problem of the low yield of Indium-tin-oxide (ITO) nanostructures deposition uses micro electroremoval technology and a design of twins-cylinder tool as a precision etching process to remove the defective Indium-tin-oxide (ITO) from the optical PET diaphragm surfaces of digital-paper displays. For the removal-process, a small gap width between the negative electrode and the workpiece (optical PET diaphragm) surface corresponds to a higher removal rate for the ITO. A small diameter of the anode or a small diameter of the cathode of the twins-cylinder tool provides large electric current density and takes less time for the same amount (20 nm) of ITO removal. High rotational speed of the twins-cylinder tool the discharge mobility and results in improving the removal effect. Providing enough electrical power can uses fast feed rate of the optical PET diaphragm combined with a fast removal rate for ITO. With increasing in current rating, pulsed direct current can improve the effect of dregs discharge and is advantageous to associate with the fast feed rate of the optical PET diaphragm. By establishing a recycling process using the ultra-precise removal of thin-film nanostructures, through the micro electroremoval and the twins-cylinder electrodes requires only a short period of time to remove the ITO thin-film easily and cleanly. The optoelectronic semiconductor industry can effectively recycle defective products, minimizing both production costs and pollution.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on shape memory effects of LC epoxy resins with lateral substituents

    Liyan LiangDewen ZhouMangeng Lu
    391-393页
    查看更多>>摘要：A series of shape memorized liquid crystalline epoxides with different length of lateral substituents were prepared with several kinds of hardener. The dynamic mechanical analysis and the sharp memory properties of the resulted LC epoxy resins were studied by POM, WAXD, DSC and DMA. The results showed that the modulus in the rubbery region (E_R) of the LC epoxides decreases as the length of lateral alkyl groups increases. And the shape memory properties were strongly impacted not only by the length of lateral substituents, but also by the kinds of hardener. The recovering speeds of the shape-memory liquid crystalline epoxides decrease as the increasing length of lateral alkyl groups. And recovering speeds of LC epoxides cured with aromatic amine (DDM) are faster than that of LC epoxides cured with anhydride (THHPA). The local ordered structures and the lateral substituents played an important role in shape memory effects.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A color management model for color sensors of liquid crystal display

    Xinwu Li
    394-397页
    查看更多>>摘要：Color management for liquid crystal display is one of the key techniques in the color image reproduction. A new color management model is presented based on overcoming flaws and limitations of current ways of liquid crystal display color management . First, the paper takes standard color target for experimental sample, and substitutes color blocks in color shade district for complete color space. Second, data collecting method is introduced and some data bases for deducing the model are created. Then, ant colony algorithm is corrected to speed up model's convergence and a new model for liquid crystal display color management based on improved ant colony algorithm is deduced and analyzed. Finally the experimental results show that the model can improve color management accuracy of liquid crystal display and can be used in its color management practically.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Dependence of optical properties of UV-curable sealant on amount of catalyst N, N-dimethylbenzylamine

    Qing-Ian MaYuan Ming Huang
    398-401页
    查看更多>>摘要：In the presence of the catalyst N, N-dimethylbenzylamine, a series of ultraviolet-curable sealants 1-6 were synthesized by varying the catalyst amount from 0.5,1.0, 1.5,2.0,2.5 and 3.0 part in the process of polymerizing the epoxy resin (25 parts) with acrylic acid (17.5 parts). After having been cured by UV light, the transmittance of equally-thick films of the sealants changed with the amount of the catalyst. Furthermore, we recorded the transmittance of UV-cured sealant films when aged in air at high temperatures. Our results have demonstrated that the amount of catalyst poses limited effects on the transmittance of the synthesized sealants.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd