Liquid crystal compositions

Details Liquid crystal compositions Liquid crystal compositions

1995-05-05

1997-08-05

Wu, Shean C.

Compositions

Liquid crystal compositions

25229961, 25229963, 25229966, 25229967, 349182, C09K 1952, C09K 1934, C09K 1930, G02F 113

Patent

active

056539126

ABSTRACT:
Disclosed are liquid crystal compositions each comprising a first component (formula (I)), a second component (formula (II)), a third component (formulae (III) to (V)) and a fourth component (formulae (VI) and (VII)): ##STR1## R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.9 each are a C.sub.1-8 alkyl; n, m, p, q and r each are 0 or 1; R.sub.8 and R.sub.10 each are a C.sub.1-8 alkyl or alkoxy, or a C.sub.2-8 alkoxymethyl; A.sub.1 is a 1,5-cyclohexylene, 1,4-phenylene or 1,3-dioxane-2,5-diyl; A.sub.2 and A.sub.5 each are a 1,4-cyclohexylene, 1,4-phenylene or pyrimidine-2,5-diyl; A.sub.3, A.sub.4, A.sub.6 and A.sub.7 each are a 1,4-cyclohexylene or 1,4-phenylene; Z.sub.1, Z.sub.3 and Z.sub.6 each are --COO-- or a single bond; Z.sub.2 and Z.sub.4 each are --CH.sub.2 --CH.sub.2 --, --CH.dbd.CH-- or a single bond; Q and Z.sub.5 each are --CH.sub.2 CH.sub.2 -- or a single bond; L, X and T each are F or H; S is F, Cl or CF.sub.3. Also provided are electro-optical display devices containing any of these compositions, which have rapid response and can be driven even at a low voltage. The temperature-dependence of the driving voltage for the devices is reduced.

REFERENCES:
patent: 4439340 (1984-03-01), Kojima et al.
patent: 4507222 (1985-03-01), Inoue et al.
patent: 4536321 (1985-08-01), Sugimori et al.
patent: 4622164 (1986-11-01), Eidenschik et al.
patent: 4661283 (1987-04-01), Sugimori et al.
patent: 4778620 (1988-10-01), Goto et al.

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