Patent ID: 7651742

Claim:
A liquid-crystalline medium of positive dielectric anisotropy based on a mixture of compounds, said medium comprising one or more compounds of the formula I in which R 1 is a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals are each, independently of one another, optionally replaced by —C≡C—, —CH═CH—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, ring A is a ring system of the formulae pointing to the left or right, Z 1 , Z 2 are each, independently, a single bond, —C≡C—, —CF═CF—, —CH═CH—, —CF 2 O— or —CH 2 CH 2 —, where at least one of Z 1 and Z 2 is —CF═CF—, X is F, Cl, CN, SF 5 or a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals are each, independently of one another, optionally replaced by —C≡C—, —CH═CH—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, L 1 , L 2 , L 3 , L 4 , L 5 and L 6 are each, independently of one another, H or F, and m is 0 or 1; and said medium further comprises one or more compounds of formulae K-1 to K-12: in which R 0 is n-alkyl, oxaalkyl, fluoroalkyl or alkenyl, each having up to 9 C atoms.