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Liquid crystal display device

  • US 7,609,346 B2
  • Filed: 12/04/2006
  • Issued: 10/27/2009
  • Est. Priority Date: 12/05/2005
  • Status: Expired due to Fees
First Claim
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1. A liquid crystal display device comprising:

  • a liquid crystal display panel comprising a first substrate having a plurality of reflection patterns protruding from a major surface of the first substrate, a second substrate disposed to be opposed to the first substrate, and a liquid crystal layer including liquid crystal molecules, which are twist-aligned at a twist angle of 70°

    ±

    10°

    , held between the first substrate and the second substrate; and

    an optical element provided on an outer surface of the second substrate,wherein the optical element includes a polarizer plate, a first retardation plate which is disposed between the polarizer plate and the liquid crystal display panel and imparts a phase difference of a ½

    wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the first retardation plate, and a second retardation plate which is disposed between the first retardation plate and the liquid crystal display panel and imparts a phase difference of a ¼

    A wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the second retardation plate,a retardation value Δ



    d of the liquid crystal layer is set at 200 nm ±

    30 nm, where Δ

    n is a refractive index anisotropy of the liquid crystal layer and d is a thickness of the liquid crystal layer, andwherein a horizontal direction of the major surface of either of the first and second substrates is a reference azimuth, a counterclockwise direction relative to the reference azimuth is a positive direction and a clockwise direction relative to the reference azimuth is a negative direction, a director of the liquid crystal molecules is set within a range of 225°

    ±

    20°

    or a range of 315°

    ±

    20°

    relative to the reference azimuth.

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