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Liquid crystal display element and a projection type liquid crystal display apparatus

  • US 5,379,137 A
  • Filed: 08/18/1993
  • Issued: 01/03/1995
  • Est. Priority Date: 03/27/1991
  • Status: Expired due to Term
First Claim
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1. A gray scale liquid crystal display element comprisinga pair of substrates provided with electrodes anda liquid crystal and solidified matrix composite material, disposed between said pair of substrates which includes a nematic liquid crystal dispersed and held in a solidified matrix,said nematic liquid crystal being such that the refractive index of said liquid crystal is changed depending on states of applying a voltage wherein in one state the refractive index of said liquid crystal substantially coincides with that of said solidified matrix to thereby pass light, and in another state the former does not coincide with the latter to thereby cause the scattering of light, characterized in that the refractive index anisotropy Δ

  • n of said liquid crystal used is 0.20≦

    Δ

    n,and the dielectric anisotropy Δ

    ε

    LC of said liquid crystal used satisfies the relationship of 5<

    Δ

    ε

    LC <

    13,and the average particle diameter R (μ

    m) of said liquid crystal and solidified matrix composite material satisfies the relationship of 0.2<



    Δ

    n<

    0.7,and the dielectric constant ε

    M of said liquid crystal and solidified matrix composite material, satisfies the relationship of Δ

    ε

    LC <

    1.45 ε

    M,and the elastic constant K33 (10-12 N) of said liquid crystal in said liquid crystal and solidified matrix composite material satisfies the relationship of 4(K33/η

    )0.5 >

    R>

    (K33/Δ

    ε

    LC)0.5.

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