Patent ID: 7740918

Claim:
A liquid crystal medium comprising: a first dielectrically positive component, component A, comprising at least one dielectrically positive compound of the formula a second dielectrically positive component, component B, comprising one or more dielectrically positive compounds having a dielectric anisotropy of more than 3; and optionally a dielectrically neutral component, component C, comprising one or more dielectrically neutral compounds having a dielectric anisotropy of −1.5 to 3; wherein component B comprises one or more compounds selected from formulae III-1a-1 to III-1a-6, optionally one or more compounds of formula III-2, and optionally one or more compounds of formula II wherein R 2 and R 3 are, independently of each other, alkyl having 1 to 7 C-atoms, alkoxy having 1 to 7 C-atoms, fluorinated alkyl having 1 to 7 C-atoms, fluorinated alkoxy having 1 to 7 C-atoms, alkenyl having 2 to 7 C-atoms, alkenyloxy having 2 to 7 C-atoms, alkoxyalkyl having 2 to 7 C-atoms, or fluorinated alkenyl having 2 to 7 C-atoms, are, independently of each other, L 21 , L 22 , L 31 and L 32 are, independently of each other, H or F, X 2 and X 3 are, independently of each other, halogen, halogenated alkyl having 1 to 3 C-atoms, halogenated alkoxy having 1 to 3 C-atoms, halogenated alkenyl having 2 to 3 C-atoms, or alkenyloxy having 2 or 3 C-atoms, and l, m, n and o are, independently of each other, 0 or 1.