Patent ID: 6045878
Filing Date: 2000-04-04
Classification: C09K

Abstract:
An electro-optical liquid-crystal displayhaving a realignment layer for realigning the liquid crystals whose field has a significant component parallel to the liquid-crystal layerand containing a liquid-crystalline medium of positive dielectric anisotropy, wherein the medium comprises:at least one compound of the formula I ##STR35## in which R.sup.1 is H, an alkyl or alkenyl radical having 1 to 15 carbon atoms which is unsubstituted, monosubstituted by CN or CF.sub.3 or monosubstituted to perhalo-substituted by halogen, where one or more CH.sub.2 groups in these radicals are optionally, in each case independently of one another, replaced by --O--, --S--, --CO--, --CO--O--, --O--CO-- or --O--CO--O-- in such a way that O atoms are not linked directly to one another,A.sup.1 and A.sup.2 are each, independently of one another,(a) 1,4-cyclohexenylene radical or trans-1,4-cyclohexylene radical, in which one or more non-adjacent CH.sub.2 groups are optionally replaced by --O-- and/or --S--,(b) 1,4-phenylene radical, in which one or two CH groups are optionally replaced by N,(c) radical selected from the group consisting of 1,4-bicyclo[2.2.2] octylene, piperidine-1,4-diyl, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthaline-2,6-diyl,where the radicals (a) and (b) are optionally substituted by one ore two fluorine atoms,Z.sup.1 and Z.sup.2 are each, independently of one another, --CO--O--, --O--CO--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH.dbd.CH--, --C.tbd.C--, or a single bond, or one of the radicals Z.sup.1 and Z.sup.2 is --(CH.sub.2).sub.4 -- or --CH.dbd.CH--CH.sub.2 CH.sub.2 --, andm is 0, 1 or 2,and at least one compound of the formula I*a ##STR36## in which z is 1-12, andR* is H, CH.sub.3, C.sub.2 H.sub.5 or n-C.sub.3 H.sub.7.