Liquid-crystal medium, characterised in that it comprises one or more compounds selected from the group of the formulae I-M and I-U, wherein R 1 is alkyl, which is straight chain or branched, is unsubstituted, mono- or poly-substituted by F, Cl or CN, and in which one or more CH 2 groups are optionally replaced, in each case independently from one another, by -O-, -S-, -NR 01 -, -SiR 01 R 02 -, -CO-, -COO-, -OCO-, -OCO-O-, -S-CO-, -CO-S-, -CY 01 =CY 02 - or -C≡C- in such a manner that O and/or S atoms are not linked directly to one another, L 1 is F, X 1 is F, CN or CF3, Y 01 and Y 02 are, independently of each other, F, Cl or CN, and alternatively one of them may be H, and R 01 and R 02 are, independently of each other, H or alkyl with 1 to 12 C-atoms, and one or more compounds selected from the group of compounds of the formulae I and VI wherein denotes L 1 denotes H, alkyl having 1 to 6 C atoms, cycloalkyl having 3 to 6 C atoms or cycloalkenyl having 4 to 6 C atoms, X 1 denotes H, alkyl having 1 to 3 C atoms or halogen, R 11 to R 14, independently of one another, denote unfluorinated alkyl or unfluorinated alkoxy, each having 1 to 15 C atoms, unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl, each having 2 to 15 C atoms, or cycloalkyl, alkylcycloalkyl, cycloalkenyl, alkylcycloalkenyl, alkylcycloalkylalkyl or alkylcycloalkenylalkyl, each having up to 15 C atoms, and alternatively one of R 13 and R 14 or both also denote H; L 61 denotes R 61 and, in the case where Z 61 and/or Z 62 denote trans -CH=CH- or trans -CF=CF-, alternatively also denotes X 61, L 62 denotes R 62 and, in the case where Z 61 and/or Z 62 denote trans -CH=CH- or trans -CF=CF-, alternatively also denotes X 62, R 61 and R 62, independently of one another, denote H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms, X 61 and X 62, independently of one another, denote F or Cl, -CN, -NCS, -SF 5, fluorinated alkyl or alkoxy having 1 to 7 C atoms or fluorinated alkenyl, alkenyloxy or alkoxyalkyl having 2 to 7 C atoms, or -NCS, one of Z 61 and Z 62 denotes trans -CH=CH-, trans -CF=CF- or -C=C- and the other, independently thereof, denotes trans -CH=CH -, trans- CF=CF- or a single bond, and to independently of one another, denote or R 1 is alkyl, which is straight chain or branched, is unsubstituted, mono- or poly-substituted by F, Cl or CN, and in which one or more CH 2 groups are optionally replaced, in each case independently from one another, by -O-, -S-, -NR 01 -, -SiR 01 R 02 -, -CO-, -COO-, -OCO-, -OCO-O-, -S-CO-, -CO-S-, -CY 01 =CY 02 - or -C≡C- in such a manner that O and/or S atoms are not linked directly to one another, L 1 is F, X 1 is F, CN or CF3, Y 01 and Y 02 are, independently of each other, F, Cl or CN, and alternatively one of them may be H, and R 01 and R 02 are, independently of each other, H or alkyl with 1 to 12 C-atoms, L 1 denotes H, alkyl having 1 to 6 C atoms, cycloalkyl having 3 to 6 C atoms or cycloalkenyl having 4 to 6 C atoms, X 1 denotes H, alkyl having 1 to 3 C atoms or halogen, R 11 to R 14, independently of one another, denote unfluorinated alkyl or unfluorinated alkoxy, each having 1 to 15 C atoms, unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl, each having 2 to 15 C atoms, or cycloalkyl, alkylcycloalkyl, cycloalkenyl, alkylcycloalkenyl, alkylcycloalkylalkyl or alkylcycloalkenylalkyl, each having up to 15 C atoms, and alternatively one of R 13 and R 14 or both also denote H; L 61 denotes R 61 and, in the case where Z 61 and/or Z 62 denote trans -CH=CH- or trans -CF=CF-, alternatively also denotes X 61, L 62 denotes R 62 and, in the case where Z 61 and/or Z 62 denote trans -CH=CH- or trans -CF=CF-, alternatively also denotes X 62, R 61 and R 62, independently of one another, denote H, unfluorinated alkyl or unfluorinated alkoxy having 1 to 17 C atoms or unfluorinated alkenyl, unfluorinated alkenyloxy or unfluorinated alkoxyalkyl having 2 to 15 C atoms, X 61 and X 62, independently of one another, denote F or Cl, -CN, -NCS, -SF 5, fluorinated alkyl or alkoxy having 1 to 7 C atoms or fluorinated alkenyl, alkenyloxy or alkoxyalkyl having 2 to 7 C atoms, or -NCS, one of Z 61 and Z 62 denotes trans -CH=CH-, trans -CF=CF- or -C=C- and the other, independently thereof, denotes trans -CH=CH -, trans- CF=CF- or a single bond, and