Patent ID: 8262930

Claim:
A liquid crystal medium, comprising one or more compounds of formula I wherein R 1 is alkyl, alkoxy, fluorinated, alkyl or fluorinated alkoxy, alkenyl, alkenyloxy, alkoxyalkyl, fluorinated alkenyl or fluorinated alkenyloxy, L 11 to L 13 are independently of each other H or F, and X 1 is F or Cl, one or more compounds selected from the group consisting of compounds of formulae II and III wherein R 2 and R 3 , independently of each other, are 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, 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 or alkoxy with 1 to 3 C-atoms or halogenated alkenyl or alkenyloxy with 2 or 3 C-atoms, Z 3 is —CH 2 CH 2 —, —CF 2 CF 2 —, —COO—, trans- —CH═CH—, trans- —CF═CF—, —CH 2 O— or a single bond, and l, m, n and o are independently of each other 0 or 1, and one or more compounds selected from the group consisting of cmpounds of formulae IV and V wherein R 41 to R 52 independently of each other have the meaning given for R 2 under formula II above, and independently of each other and in case is present twice, also these independently of each other, are independently of each other and in case is present twice, also these independently of each other, are Z 41 to Z52 independently of each other, and in case Z 41 and/or Z 51 is/are present twice, also these independently of each other, are —CH 2 CH 2 —, —COO—, trans- —CH═CH—, trans- —CF═CF—, —CH 2 O—, —CF 2 O—, —C≡C— or a single bond, and p and q are independently of each other 0, 1 or 2, with the proviso that the medium comprises one or more compounds of formula III, wherein n and o both are 1 and all rings are 1,4-phenylene, which independently of each other optionally are fluorinated once or twice, and/or one or more compounds of formula V, wherein q is 2.