Application of a Circularly Homogeneously Aligned Liquid-Crystal Cell to Real-Time Measurements of Twist Angles in Twisted-Nematic Liquid-Crystal Cells

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  • Honma Michinori
    Department of Electrical and Electronic Engineering, Akita University 1-1 Tegatagakuen-cho, Akita 010-8502, Japan
  • Yamaguchi Rumiko
    Department of Electrical and Electronic Engineering, Akita University 1-1 Tegatagakuen-cho, Akita 010-8502, Japan
  • Sato Susumu
    Department of Electrical and Electronic Engineering, Akita University 1-1 Tegatagakuen-cho, Akita 010-8502, Japan

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  • Application of a Circularly Homogeneously Aligned Liquid-Crystal Cell.

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A novel system which employs a pair of circularly homogeneously aligned liquid crystal cells (CH-LC cells) for measuring the time-dependent twist angles of twisted- nematic liquid crystal (TN-LC) cells is proposed. A unique polarization-converting property of a CH-LC cell is discussed. A scheme of calculating the twist angle is derived by the Jones matrix. The applicability of the proposed system is confirmed by measuring the time-dependent twist angle of a TN-LC cell with partially saponified polyvinyl alcohol (PVA) films in real time. Two factors, on which the measurement accuracy depends, are discussed: deviations of the polarizer and the analyzer from both x and y-axes and the resolution of the measured transmission image. The measurement accuracy in this paper is estimated to be within about 1º.

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