Patent ID: 7563491

Claim:
A liquid crystal medium comprising: a first dielectrically positive component, component A, comprising at least one dielectrically positive compound of formula I wherein R 1 is 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, X 1 is halogen, L are independently of each other, Cl or F, and n and m are, independently of each other, each an integer from 0 to 4; 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 of formulae II-1a to II-1i R 2 is 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, L 21, L 22, L 23 and L 24 are, independently of each other, H or F, X 2 is 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 halogenated alkenyloxy having 2 or 3 C-atoms.