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STN LCD device displaying multiple colors in response to different voltages which includes a retardation plate

  • US 5,585,950 A
  • Filed: 04/05/1994
  • Issued: 12/17/1996
  • Est. Priority Date: 04/12/1993
  • Status: Expired due to Term
First Claim
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1. A color liquid crystal display apparatus comprising:

  • a pair of substrates having opposing surfaces, electrodes respectively formed on the opposing surfaces, and aligning films respectively formed to cover said electrodes, said aligning films having undergone aligning treatment in predetermined directions;

    a liquid crystal layer formed between said pair of substrates and having liquid crystal molecules aligned to be twisted at a twist angle of 180°

    to 270°

    from one substrate to the other substrate;

    a pair of polarizing plates disposed outside said pair of substrates to sandwich said substrates and respectively having transmission axes for linearly polarizing incident light;

    a retardation plate having a maximum refraction index direction which is within a plane parallel to a surface of said retardation plate and having a value of retardation for coloring light transmitted through the liquid crystal display apparatus, in combination with the Δ



    d of the liquid crystal layer, said retardation plate being disposed between said pair of polarizing plates such that an angle defined by said maximum refractive index direction, and the transmission axis of an adjacent one of said polarizing plates is 35°

    to 55°

    ; and

    driving means, connected to said electrodes, for applying a voltage to said liquid crystal layer to change a polarized state of light transmitted through said liquid crystal layer so as to change a color of light transmitted through said polarizing plate on an exit side into plural colors including at least two chromatic colors.

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