Nematic liquid crystal mixtures.

摘要

The invention relates to a nematic liquid crystal mixture having a positive dielectric anisotropy DELTA epsilon of at least +4 and a birefringence DELTA n of at least 0.12, characterized in that the mixture comprises simultaneously one or more components having the core structure <CHEM> wherein L<1>, L<2>, Y and Z are each independently of one another H or F, one of Q<1> and Q<2> is 1,4-phenylene, 3-fluoro-1,4-phenylene or 3,5-difluoro-1,4-phenylene and the other residue Q<1> of Q<2> is -CH2CH2-, -CH2CH2CH2CH2- or - if at least one of L<1>, L<2>, Y and Z denotes F - also a single bond, whereby this core structure can be optionally further fluorinated in the benzene rings, and one or more compounds of the formula II <CHEM> wherein R is alkyl of up to 10 carbon atoms r is 1 or 2, X is F, Cl or a fluorinated and/or chlorinated alkyl, alkenyl or alkoxy group of 1, 2 or more carbon atoms, and L<1>, L<2>, Y and Z are as defined above. >