Patent ID: 7425355

Claim:
A liquid-crystalline medium based on a mixture of polar compounds, which comprises: at least one compound of the formula I: in which R 11 and R 12 each, independently of one another, are H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or mono- to perhalo-substituted by halogen, where, optionally, one or more CH 2 groups in these radicals are replaced by —O—, —S—, —C≡C—, —CF 2 O—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, is a) a 1,4-cyclohexenylene or 1,4-cyclohexylene radical, in which one or two non-adjacent CH 2 groups are optionally replaced by —O— or —S—, b) a 1,4-phenylene radical, in which one or two CH groups are optionally replaced by N, c) a radical selected from the group consisting of piperidine-1,4-diyl, 1,4-bicyclo[2.2.2]octylene, naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, phenanthrene-2,7-diyl and fluorene-2,7-diyl, where the radicals a), b) and c) are optionally monosubstituted or polysubstituted by halogen atoms, and L 1-6 each, independently of one another, are H or F, with the proviso that at least one pair of radicals L 1 and L 2 or L 3 and L 4 or L 5 and L 6 are both F; and one or more compounds of the formulae IIA and/or IIB: in which R 2 is an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or mono- to perhalo-substituted by halogen, where, optionally, one or more CH 2 groups in these radicals are replaced, independently of one another, by —O—, —S—, —C≡C—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a way that O atoms are not linked directly to one another, p is 1 or 2, and v is 1 to 6.