Liquid crystal composition and liquid crystal display device

Details Liquid crystal composition and liquid crystal display device Liquid crystal composition and liquid crystal display device

1997-03-24

1998-11-17

Wu, Shean C.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229963, 25229964, 25229966, 25229967, 428 1, C09K 1934, C09K 1930, C09K 1912

Patent

active

058371613

ABSTRACT:
Liquid crystal compositions having a small value of .gamma. (V.sub.10 /V.sub.90) and a small .tau. (fast response speed) in order to cope especially with high speed response, while satisfying various characteristics required of STN display mode. These compositions comprise at least one compound expressed by formula (I) as a first component; expressed by any one of formulas (II-a) to (II-d) as a second component; and expressed by formula (III) or (IV) as a third component; and as a fourth component, a chiral component in the amount necessary for maintaining the ratio d/P of the cell thickness d (.mu.m) to the pitch length of twist P (.mu.m) in the range of 0.4 to 0.6 when the liquid crystal composition is used for liquid crystal display devices. ##STR1## wherein R.sup.1 to R.sup.9 represent an alkyl group having 1 to 10 carbon atoms; Z.sup.0 to Z.sup.4 represent, for example, --CH.sub.2 CH.sub.2 --; A.sup.1 to A.sup.4, B, C, E, and G independently represent, for example, 1,4-cyclohexylene or 1,4-phenylene; D represents 1,4-cyclohexylene or 1,3-pyrimidine-2,5-diyl; Q.sup.1 represents H or F; and q and m are independently 0 or 1.

REFERENCES:
patent: 4779960 (1988-10-01), Kozaki et al.
patent: 5055224 (1991-10-01), Sage et al.
patent: 5102577 (1992-04-01), Uchida et al.
patent: 5207944 (1993-05-01), Sawada et al.
patent: 5258135 (1993-11-01), Uchida et al.
patent: 5354503 (1994-10-01), Sawada et al.

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