ITE Technical Report
Online ISSN : 2433-0914
Print ISSN : 0386-4227
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Volume 18, Issue 9
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1994 Volume 18 Issue 9 Pages Cover1-
    Published: February 17, 1994
    Released on J-STAGE: October 13, 2017
    DOIhttps://doi.org/10.11485/tvtr.18.9_Cover1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    1994 Volume 18 Issue 9 Pages Toc1-
    Published: February 17, 1994
    Released on J-STAGE: October 13, 2017
    DOIhttps://doi.org/10.11485/tvtr.18.9_Toc1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • Simulation of Spatial Distribution of Liquid Crystal Director by New Method of Variational Calculus
    Susumu NISHIDA
    Article type: Article
    1994 Volume 18 Issue 9 Pages 1-8
    Published: February 17, 1994
    Released on J-STAGE: October 13, 2017
    DOIhttps://doi.org/10.11485/tvtr.18.9_1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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    A new method of solving variational problems, is presented. Usual methods to solve variational problems are to derive " Euler's differential equations" and then solve them as boundary condition problems. Disadvantages of those methods are that the algorithm is complicated and the convergence is sometimes unstable. A new method does not use Euler's equations, but use numerical search of the solution by computor. Advantages of the new method are simplicity and stability. As an application of this method, the spatial distribution of director in twisted nematic liquid crystal display is calculated.
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  • Estimation of Optical Biaxiality In a Smectic A phase
    S. Kataoka, Y. Iimura, S. Kobayashi
    Article type: Article
    1994 Volume 18 Issue 9 Pages 9-12
    Published: February 17, 1994
    Released on J-STAGE: October 13, 2017
    DOIhttps://doi.org/10.11485/tvtr.18.9_9
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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    The electroclinic effect appearing in the smectic A phase of ferroelectric liquid crystal has been studied using modulated voltage method. By analyzing the second harmonic signal in the transmitted light intensity optical biaxiality arising from the electroclinic effect is estimated to be &ap;0.001 at the clinic angle of 5°.
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  • Electro-optic characteristic of N^* liquid crystal cells with asymmetric pretilts
    Norikazu Yamada, Kohki Hiroshima
    Article type: Article
    1994 Volume 18 Issue 9 Pages 13-18
    Published: February 17, 1994
    Released on J-STAGE: October 13, 2017
    DOIhttps://doi.org/10.11485/tvtr.18.9_13
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    Cells used are asymmetrically composed of two substrates which have a high pretilt θH and a low one θL, respectively, and are filled by a long pitch cholesteric liquid crystal material. Focal conic stripe-domain textures appear in a wedge type cell The direction of the stripe changes continuously with θH = 88 and θL = 30 degrees. according as (pitch / cell gap) increases, without any disclination lines. In 3 microns sandwich type cells with θH = 80 and θL = 30 degrees, transition from 2π-twist Grand-jean texture to π-twist one is observed by applying a voltage. An electo-optic characteristic of the cells shows a steep threshold and a rapid response.
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  • VIEWING ANGLE EVALUATION METHOD OF COLOR SHIFT FOR LCDS WITH GRAY SCALE IMAGE
    Makiko Sato, Masahito Ishikawa, Yuzo Hisatake, Hitoshi Hatoh
    Article type: Article
    1994 Volume 18 Issue 9 Pages 19-24
    Published: February 17, 1994
    Released on J-STAGE: October 13, 2017
    DOIhttps://doi.org/10.11485/tvtr.18.9_19
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    The viewing angle characteristics of LCDs with gray scale images were evaluated using parameters which are related to luminance and color. The results were compared with the subjectively estimated results. It was found that iso-curves of maximum value of difference in hue-angle are useful in evaluating the viewing angle characteristics of LCDs.
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  • Transmittance Drift Properties of Liquid-Crystal Cells by DC Voltage
    Tohru Sasaki, Makoto Tsumura, Yoshiharu Nagae, Masahiko Suzuki, Toshir ...
    Article type: Article
    1994 Volume 18 Issue 9 Pages 25-30
    Published: February 17, 1994
    Released on J-STAGE: October 13, 2017
    DOIhttps://doi.org/10.11485/tvtr.18.9_25
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    The image-sticking effect in Thin-Film Transistor activated Liquid Crystal Display (TFT-LCD) was modelized as the transmittance drift by DC voltage in liquid-crystal cells. The method how the transmittance drift was calculated from the residual DC potential drift, which causes the image-sticking, by the electro-optic characteristics of liquid crystal was proposed. The transmittance drifts calculated from the measured residual DC potential drifts quantitatively agreed with the experimantal results. Therefore, the method is useful to analyze the image-sticking effect in liquid-crystal cells.
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  • Improvement of Image Stickling in TFD LCD
    K. Miyake, T. Nakamura, T. Hirai, M. Watanabe, Y. Abe, S. Kamagami, H. ...
    Article type: Article
    1994 Volume 18 Issue 9 Pages 31-36
    Published: February 17, 1994
    Released on J-STAGE: October 13, 2017
    DOIhttps://doi.org/10.11485/tvtr.18.9_31
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    I-V characteristics shift has been confirmed to be a cause of image-sticking on TFD-LCD. Image-sticking time is proportional to I-V characteristic shift, and the smaller shift provides shorter image-sticking time. The I-Vcharacteristic shift can be reduced by high temperature heat treatment. The temperature and anodic oxidization voltage, however, must be optimized, because the high temperature heat-treatment degrades the contrast ratio.
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  • A computer simulation on the electrooptical responses of FLCs : Effects of surface interactions on the electrooptical responses
    M. Itoh, H. Matsusima, Y. Iimura, S. Kobayashi
    Article type: Article
    1994 Volume 18 Issue 9 Pages 37-42
    Published: February 17, 1994
    Released on J-STAGE: October 13, 2017
    DOIhttps://doi.org/10.11485/tvtr.18.9_37
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    In order to study the effect of the surface interaction in the ferroelectric liquid crystal cells (FLCs) on their electrooptical responses, the computer simulation for the electrooptical responses has been carrier out by using the torque balance equation and the 4×4 matrix method. The simulation tells us that, when the triangular or the square wave voltage is applied to FLCs With chevron structure, the delay time on the optical responses tends to become large with increasing the anchoring energy and/or the pretilt angle of the cells.
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  • [title in Japanese]
    Article type: Appendix
    1994 Volume 18 Issue 9 Pages App1-
    Published: February 17, 1994
    Released on J-STAGE: October 13, 2017
    DOIhttps://doi.org/10.11485/tvtr.18.9_App1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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