| 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 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 9 each are a C 1-8 alkyl; n, m, p, q and r each are 0 or 1; R 8 and R 10 each are a C 1-8 alkyl or alkoxy, or a C 2-8 alkoxymethyl; A 1 is a 1,5-cyclohexylene, 1,4-phenylene or 1,3-dioxane-2,5-diyl; A 2 and A 5 each are a 1,4-cyclohexylene, 1,4-phenylene or pyrimidine-2,5-diyl; A 3 , A 4 , A 6 and A 7 each are a 1,4-cyclohexylene or 1,4-phenylene; Z 1 , Z 3 and Z 6 each are --COO-- or a single bond; Z 2 and Z 4 each are --CH 2 --CH 2 --, --CH═CH-- or a single bond; Q and Z 5 each are --CH 2 CH 2 -- or a single bond; L, X and T each are F or H; S is F, Cl or CF 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. |