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Plural layer liquid crystal display device for a high density display

  • US 5,136,406 A
  • Filed: 06/06/1989
  • Issued: 08/04/1992
  • Est. Priority Date: 10/06/1987
  • Status: Expired due to Fees
First Claim
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1. A liquid crystal display device comprising:

  • a first liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material which is interposed between a pair of substrates each having an aligning layer which are arranged substantially in parallel;

    a voltage applying means to apply a voltage across transparent electrodes of said pair of substrates which interpose said first liquid crystal layer therebetween;

    a second liquid crystal layer of a nematic liquid crystal including a chiral material which is interposed between a pair of substrates each having an aligning layer, said second liquid crystal layer being adjacent to said first liquid crystal layer; and

    a pair of polarizing plates arranged outside said first and second liquid crystal layers, wherein;

    said second liquid crystal layer contains dye for color compensation;

    the product Δ

    n1 ·

    d1 of an anisotropy of refractive index Δ

    n1 of liquid crystal in said first liquid crystal layer and a thickness of the first liquid crystal layer d1 is in a range of 0.7-2.0 μ

    m;

    an axial direction of liquid crystal molecules of said first liquid crystal layer in an area close to said second liquid crystal layer is crossed at substantially a right angle to an axial direction of liquid crystal molecules of said second liquid crystal layer in an area close to said first liquid crystal layer;

    a twist angle of the liquid crystal molecules in said first liquid crystal layer is in a range of 200°

    -300°

    ;

    a twist angle of the liquid crystal molecules in said second liquid crystal layer is substantially the same as the first liquid crystal layer but a helical sense thereof is opposite; and

    an angle of intersection of the polarization axes of said pair of polarizing plates arranged outside said two liquid crystal layers is in a range of 60°

    -120°

    .

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