Liquid crystal composition for twist nematic mode

Details Liquid crystal composition for twist nematic mode Liquid crystal composition for twist nematic mode

1988-11-18

1990-05-08

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

2522995, 25229963, 350350R, G02F 113, G09K 1934, G09K 1930

Patent

active

049236326

ABSTRACT:
A liquid crystal composition for twist nematic mode having improved reduction in threshold voltage and temperature dependency of the threshold voltage in a liquid crystal display element using the composition, and a liquid crystal display element are provided, which composition comprises a compound of the formula ##STR1## wherein R.sub.1 is 1-8C alkyl, R.sub.2 is F or CN and n is 1 or 2; or comprises the compound of the formula (I) as a first component and at least one member as a second component selected from compounds of the following formulas (II), (III) and (IV); ##STR2## wherein R.sub.3 is 1-8C alkyl and R.sub.4 is H or F, ##STR3## wherein R.sub.5 is 1-8C alkyl, R.sub.6 is 1-8C alkoxy or F, m is 1 or 2 and X is single bond or --COO--, and ##STR4## wherein R.sub.7 is 1-8C alkyl, R.sub.8 is 1-8C alkyl or alkoxy, F or CN and ##STR5##

REFERENCES:
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patent: 4536321 (1985-08-01), Sugimori et al.
patent: 4581155 (1986-04-01), Goto et al.
patent: 4640795 (1987-02-01), Ogawa et al.
patent: 4695398 (1987-09-01), Goto et al.
patent: 4776975 (1988-10-01), Sawaba et al.
patent: 4853152 (1989-08-01), Goto

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