Ferroelectric liquid-crystalline media, and their use in electro

Details Ferroelectric liquid-crystalline media, and their use in electro Ferroelectric liquid-crystalline media, and their use in electro

1993-09-29

1995-02-07

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229966, 25229967, 25229961, 359103, C09K 1912, G02F 113

Patent

active

053873718

ABSTRACT:
The invention relates to a ferroelectric liquid-crystalline medium having improved low-temperature behavior, pronounced bistability and a phase sequence containing the phases isotropic, cholesteric, smectic A and chiral smectic C, comprising an achiral base material having a broad smectic C phase and at least one chiral dope which induces a spontaneous polarization of from 5 to 40 nCcm.sup.-2 in the achiral base material, characterized in that the medium has a chiral smectic C phase which is stable at least to -30.degree. C., and to the use thereof in electro-optical devices.

REFERENCES:
patent: 4834904 (1989-05-01), Krause et al.
patent: 4911863 (1990-03-01), Sage et al.
patent: 4921632 (1990-05-01), Nakamura et al.
patent: 5059345 (1991-10-01), Kobayashi et al.
patent: 5116527 (1992-05-01), Coates et al.
patent: 5198149 (1993-03-01), Reiffenrath et al.
patent: 5217644 (1993-06-01), Nohira et al.
patent: 5240638 (1993-08-01), Kikuchi et al.

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