Liquid-crystal medium, characterised in that it comprises a) one or more compounds of formula I in which R 1 denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by or and in all of which one or more H atoms may be replaced by fluorine, on each occurrence, independently of one another, denotes has one of the meanings given for and alternatively denotes L 11 and L 12, independently of one another, denote H or F, L 13 denotes H or methyl, X 1 denotes halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, m is 0, 1, or 2; and b) one or more compounds of formula II in which R 21 and R 22 denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by or and in which one or more H atoms may be replaced by fluorine, n is 0 or 1, is L 21 to L 23 independently of one another denote H or F, in a total concentration of 5 % to 30 %, and c) one or more compounds of formula D in which one of and denotes and the other of and denotes R D denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by and in which one or more H atoms may be replaced by fluorine, X D denotes F, CF 3 or OCF 3, and Y D denotes H or F, and where the medium comprises one or more compounds of formula I-1, in which R 1, L 11, L 12, and X 1 have the meanigs given for formula I, and wherein the total concentration of the compounds of the formula I-1 and D is in the range of from 15% to 50%. a) one or more compounds of formula I in which R 1 denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by or and in all of which one or more H atoms may be replaced by fluorine, on each occurrence, independently of one another, denotes has one of the meanings given for and alternatively denotes L 11 and L 12, independently of one another, denote H or F, L 13 denotes H or methyl, X 1 denotes halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, m is 0, 1, or 2; and R 1 denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by or and in all of which one or more H atoms may be replaced by fluorine, on each occurrence, independently of one another, denotes has one of the meanings given for and alternatively denotes L 11 and L 12, independently of one another, denote H or F, L 13 denotes H or methyl, X 1 denotes halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, m is 0, 1, or 2; b) one or more compounds of formula II in which R 21 and R 22 denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by or and in which one or more H atoms may be replaced by fluorine, n is 0 or 1, is L 21 to L 23 independently of one another denote H or F, in a total concentration of 5 % to 30 %, and R 21 and R 22 denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by or and in which one or more H atoms may be replaced by fluorine, n is 0 or 1, is L 21 to L 23 independently of one another denote H or F, c) one or more compounds of formula D in which one of and denotes and the other of and denotes R D denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by and in which one or more H atoms may be replaced by fluorine, X D denotes F, CF 3 or OCF 3, and Y D denotes H or F, and where the medium comprises one or more compounds of formula I-1, in which R 1, L 11, L 12, and X 1 have the meanigs given for formula I, and wherein the total concentration of the compounds of the formula I-1 and D is in the range of from 15% to 50%. one of and denotes and the other of and denotes R D denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by and in which one or more H atoms may be replaced by fluorine, X D denotes F, CF 3 or OCF 3, and Y D denotes H or F, and where the medium comprises one or more compounds of formula I-1, in which R 1, L 11, L 12, and X 1 have the meanigs given for formula I, and R D denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by and in which one or more H atoms may be replaced by fluorine, X D denotes F, CF 3 or OCF 3, and Y D denotes H or F, wherein the total concentration of the compounds of the formula I-1 and D is in the range of from 15% to 50%.