Patent ID: 7201951

Claim:
A liquid-crystalline medium comprising a mixture of polar compounds of positive dielectric anisotropy, wherein the medium comprises one or more compounds of the formula I in which R 1 is a halogenated or unsubstituted alkyl or alkoxy radical having from 1 to 15 carbon atoms, where one or more CH 2 groups in these radicals are optionally, independently of one another, 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, X is F, Cl, CN, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having 1 to 6 carbon atoms, and L 1 and L 2 are each, independently of one another, H or F; and, further comprises one or more compounds selected from the group consisting of those of the formulae II, III, IV, V and VI: in which the individual radicals have the following meanings: R 0 is n-alkyl, oxaalkyl, fluoroalkyl or alkenyl, each having 1 to 9 carbon atoms, X 0 is F, Cl, halogenated alkyl, halogenated alkenyl, halogenated alkenyloxy or halogenated alkoxy having 1 to 6 carbon atoms, Z 0 is —C 2 F 4 —, —CF═CF—, —C 2 H 4 —, —(CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —CF 2 O— or —OCF 2 —, Y 1 , Y 3 and Y 4 are each, independently of one another, H or F, Y 2 is H, and r is 0 or 1; provided that the medium exhibits a TN threshold of below 1.3V; and provided that the proportion of compounds of the formulae I to VI together in the medium as a whole is at least 50% by weight.