Patent ID: 7482044

Claim:
A liquid crystal medium comprising a first dielectrically positive component, component A, which comprises one or more dielectrically positive compounds of formula I wherein R 1 is alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy with 1 to 7 C-atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl with 2 to 7 C-atoms, X 1 is halogen, halogenated alkyl or alkoxy with 1 to 6 C-atoms or halogenated alkenyl or alkenyloxy with 2 to 6 C-atoms, Y 11 to Y 14 are, independently of each other, H or F, Z 11 to Z 13 are, independently of each other, —CH 2 CH 2 —, —CF 2 CF 2 —, —COO—, trans- —CH═CH—, trans- —CF═CF—, —CH 2 O—, —O CH 2 —, —CF 2 O—, —O CF 2 — or a single bond, and n is 0 or 1 and optionally, a second dielectrically positive component, component B, which comprises one or more dielectrically positive compounds having a dielectric anisotropy of more than 3, from which compounds of formula I are excluded, and optionally a dielectrically neutral component, component C, which comprises one or more dielectrically neutral compounds of formula IV wherein R 41 and R 42 are, independently of each other, alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy with 1 to 7 C-atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl with 2 to 7 C-atoms, p is 0, 1 or 2, are, independently of each other, and in case is present twice, also these, independently of each other, Z 41 and Z 42 are, independently of each other, and in case Z 41 is present twice, also these independently of each other, —CH 2 CH 2 —, —COO—, trans- —CH═CH—, trans- —CF═CF—, —CH 2 O—, —CF 2 O— or a single bond.