Patent ID: 7678431

Claim:
A liquid-crystalline medium comprising at least one compound of formula I and at least one compound of formula II in which L 1 , L 2 , L 3 and L 4 are each, independently of one another, H or F; R 11 is H, a halogenated or unsubstituted alkyl radical having from 1 to 15 carbon atoms, where, in addition, one or more CH 2 groups in these radicals may each be replaced, independently of one another, 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; R 21 and R 22 are each, independently of one another, H, Cl, F, CN, SF 5 , SCN, NCS, a halogenated or unsubstituted alkyl radical having from 1 to 15 carbon atoms, where, in addition, one or more CH 2 groups in these radicals may each be replaced, independently of one another, 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; Y 11 is F, Cl, CN, SF 5 , SCN, NCS, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical, each having up to 6 carbon atoms; Z 11 is a single bond, a, is 1; b, c, d and e are each, independently of one another, 0, 1 or 2; f is 1;