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Fluid crystal device

  • US 5,120,466 A
  • Filed: 09/26/1988
  • Issued: 06/09/1992
  • Est. Priority Date: 07/13/1984
  • Status: Expired due to Term
First Claim
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1. A liquid crystal device comprising a pair of base plates and a ferroelectric chiral smectic liquid crystal composition interposed between the pair of base plates;

  • said ferroelectric chiral smectic liquid crystal composition exhibiting a phase transition through cholesteric phase and smectic A phase upon temperature decrease and comprising a first liquid crystal causing successive phase transition of isotropic phase, cholesteric phase, smectic A phase and chiral smectic phase on temperature decrease, and a second liquid crystal causing successive phase transition of isotropic phase, cholesteric phase and chiral smectic phase on temperature decrease in a proportion of 0.05 to 20 wt. parts of the total first liquid crystal content per 1 wt. part of the total second liquid crystal content;

    said liquid crystal composition forming a grandjean texture in the cholesteric phase and being disposed in a layer thin enough to release the helical structure inherent to the chiral smectic phase in the absence of an electric field;

    a face of each of said base plates being provided with an inorganic or organic insulating film having a rubbing or oblique vapor deposition uniaxial orientation treatment defining orientation axes, said orientation axes being parallel to each other.

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