Liquid-crystal medium

A liquid-crystalline medium, comprising

• one or more compounds of formula IA
• in which
• R11, R12 identically or differently, denote H, an alkyl or alkoxy radical having 1 to 15 C atoms, in which one or more CH2 groups are optionally each replaced, independently of one another, by —C≡C—, —CF2O—, —OCF2—, —CH—CH—,
• —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and in which one or more H atoms are optionally replaced by halogen;
• and
• one or more compounds selected from the group of compounds of formulae T-1 to T-21
• in which
• R denotes a straight-chain alkyl or alkoxy radical having 1 to 6 C atoms,
• (O) denotes —O— or a single bond,
• m is 0, 1, 2, 3, 4, 5 or 6, and
• n is 0, 1, 2, 3 or 4;
• or
• one or more polymerizable compounds of formula P
• P-Sp-A1-(Z1-A2)z-R P
• in which
• P denotes a polymerisable group,
• Sp denotes a spacer group or a single bond,
• A1, A2 each, independently, denotes an aromatic, heteroaromatic, alicyclic or heteroaliphatic group, which may contain fused rings, and which is unsubstituted, or mono- or polysubstituted by L,
• Z1 denotes —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, OCH2—, —CH2O—, —SCH2—, —CH2S—, —CF2O—, —OCF2—, —CF2S—, —SCF2—, —(CH2)n1—, —CF2CH2—, —CH2CF2—, —(CF2)n1, —CH═CH—, —CF═CF—, —CH═CF—, —CF═CH—, —C≡C—, —CH═CH—CO—O—, —O—CO—CH═CH—, —CH2—CH2—CO—O—, —O—CO—CH2—CH2—, —CR0R00—, or a single bond,
• R0, R00 identically or differently, denote H or alkyl having 1 to 12 C atom,
• R denotes H, L, or P-Sp-,
• L denotes F, Cl, —CN, P-Sp- or straight chain alkyl having 1 to 25 C atoms or a branched or cyclic alkyl having 3 to 25 C atoms, in which one or more non-adjacent CH4-groups are optionally replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, or —O—CO—O— in such a manner that O- and/or S-atoms are not directly connected with each other, and in which one or more H atoms are each optionally replaced by P-Sp-, F or Cl,
• z is 0, 1, 2 or 3, and
• n1 is 1, 2, 3 or 4.