Patent ID: 7678432

Claim:
A liquid-crystalline medium comprising at least two liquid crystalline compounds, wherein said medium comprises one or more compounds of Formula I in which R 1 and R 2 are each, independently of one another, 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 may each, independently of one another, optionally replaced by —C≡C—, —CF 2 O—, —CH═CH— —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and X 2 , X 4 , X 6 , X 8 , X 10 and X 12 are each H, X 1 , X 3 , X 5 , X 7 , X 9 and X 11 are each, independently of one another, H or F, one or two of the radicals X 1 , X 5 and X 9 are F and one or two of the radicals X 3 , X 7 and X 11 are F, X 3 and X 5 are not simultaneously F, and X 7 and X 9 are not simultaneously F; and wherein said medium further comprises one or more compounds selected from the following formulae: wherein Y 1-4 are each, independently of one another, H or F, R 0 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—, —CF 2 O—, —CH═CH—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, X 0 is F, Cl, CN, SF 5 , SCN, NCS, halogenated alkyl having up to 6 C atoms, halogenated alkenyl having up to 6 C atoms, halogenated alkoxy having up to 6 C atoms, or halogenated alkenyloxy having up to 6 C atoms, and each, independently of one another, are