Liquid-crystal medium having a low threshold voltage

Abstract

The invention relates to a liquid-crystalline medium comprising a mixture of at least two compounds of the general formula (I) R1-Am-Bn-Z1-C-Z2-D-R2   (I) in which R1 is H, an alkyl or alkenyl radical having 1 to 15 carbon atoms and 2 to 15 carbon atoms, respectively, which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where one or more CH2 groups in these radicals may also, in each case independently of one another, be replaced by —O—, —S—, 1 —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a way that O atoms are not linked directly to one another; A, B, C and D are each, independently of one another, 2 in which Y, Y1, Y2, Y3, Y4, Y5 and Y6 are each, independently of one another, H or F; C is, in addition to the abovementioned meanings, 3 Z1 and Z2 are each, independently of one another, a single bond, —CH2O—, —OCH2—, —CH2—CH2—, —CH═CH—, —C≡C—, —CF2—CF2—, 13 CF2O—, —OCF2— or —CO—O—; R2 is, in addition to the abovementioned meanings of R1, F, CF3, OCF3, OCHF2, OCH2CF2H; and m and n are each, independently of one another, 0 or 1, with the proviso that Z1 is a single bond when m and n are 0, characterized in that the mixture comprises a) from 30 to 90% by weight of compounds of the general formula (I) having Δε≧9(=highly polar compounds); b) from 0 to 30% by weight of compounds of the general formula (I) having 1≦Δε≦9(=polar compounds); c) from 10 to 40% by weight of compounds of the general formula (I) having −1≦Δε≦1(=neutral compounds); the sum of a), b) and c) being 100% by weight.

Dependencies are inferred from the claim text.