Compositions – Liquid crystal compositions
Patent
1992-08-14
1995-01-24
Wu, Shean
Compositions
Liquid crystal compositions
25229962, 359 99, 359104, C09K 1952, C09K 1932, G02F 113
Patent
active
053840682
ABSTRACT:
The invention relates to an electro-optically switchable columnar liquid-crystalline system wherein the columns have ferroelectric transverse polarization.
The molecules in the columns of electro-optically switchable ferroelectric phases are tilted to or otherwise aligned with the longitudinal axis of the columns in such a manner than the columns are ferroelectrically polarized. The ferroelectric polarization is in a direction transverse to the column axis or has at least one transverse component. The polarization direction need not be the same for all columns of a columnar phase. The transverse polarization of the columns is fully or partially realigned by application of an electrical field to the liquid crystal.
The liquid-crystalline system according to the invention can be used to produce electro-optical switching and display devices.
REFERENCES:
A. M. Levelut et al., Structure of the two columnar phases of a chiral triphenylene ester, p. 569. (Abstract of A. M. Levelut et al., J. Physique, vol. 45, Apr. 1984, pp. 745-754).
Lin Lie, Molecular Crystals and Liquid Crystals pp. 41-54, May 1988.
P. Palffy-Muhoray et al., Physical Review Letters, vol. 60, May 30, 1988, pp. 2203-2306.
Bock Harald
Helfrich Wolfgang
Heppke Gerd
Hoechst Aktiengesellschaft
Wu Shean
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