Antiferroelectric liquid crystal composition

Details Antiferroelectric liquid crystal composition Antiferroelectric liquid crystal composition

1992-07-23

1995-01-03

Wu, Shean

Compositions

Liquid crystal compositions

25229961, 25229964, 25229965, 25229966, 25229967, 359103, C09K 1952, C09K 1912, C09K 1920, G02F 113

Patent

active

053783921

ABSTRACT:
An antiferroelectric mixture comprising first and second components is provided, the mixing proportions of the first and second components being 60-97 wt. % and 3-40 wt. % based upon the total weight of the two components, respectively, the first component being selected from the group consisting of compounds expressed by the formula (I) and the second component being selected from the group consisting of compounds expressed by the formula (II): ##STR1## wherein R.sup.1 and R.sup.3 are C.sub.1-18 alkyl or alkoxy, R.sup.2 and R.sup.4 are C.sub.2-18 alkyl or alkoxy, X and Y are --CH.sub.3, --CF.sub.3 or --C.sub.2 F.sub.5, rings A, B, C, D and E are 1,4-cyclohexylene, 1,4-phenylene an H atom of which may be replaced by a halogen atom or a cyano group, pyridine-2,5-diyl, pyrimidine-2,5-diyl, pyrazine-2,5-diyl or pyridazine-3,6-diyl, Z is --COO--, --CH.sub.2 O-- or --OCH.sub.2 --, m and n each are 1 or 2, (m+n) is 3, and Z is 0 or 1.
Using the above antiferroelectric liquid crystal composition, a light-switching element having improved the temperature-dependency of threshold electric field and capable of effecting a tristable switching at a high is obtained.

REFERENCES:
patent: 5102576 (1992-04-01), Terashima et al.
patent: 5108650 (1992-04-01), Koden et al.
patent: 5184847 (1993-02-01), Suzuki et al.
patent: 5316694 (1994-05-01), Murashiro et al.
Sado Takehara et al., Patent Abstracts of Japan, unexamined applications, C field, vol. 13, No. 56, Feb. 8, 1989.

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