Ferroelectric liquid-crystal systems having three or more chiral

Details Ferroelectric liquid-crystal systems having three or more chiral Ferroelectric liquid-crystal systems having three or more chiral

1995-05-02

1997-01-14

Sikes, William L.

Liquid crystal cells, elements and systems

With specified nonchemical characteristic of liquid crystal...

Within smectic phase

G02F 113

Patent

active

055945759

ABSTRACT:
Ferroelectric liquid-crystal systems having high spontaneous polarization, in particular >35 nC cm.sup.-2, and good orientation properties in the ferroelectric phase, in particular the S.sub.C * phase, contain at least three different optically active compounds, preferably as dopes in a base mixture which is not itself optically active and has a nematic phase above the smectic phase. The optically active compounds are selected so that they do not all induce a helix of the same rotation sense in the nematic phase. Their relative concentrations are selected so that the total resultant pitch of the helix throughout the cholesteric phase is not less than 10 .mu.m.

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