Liquid-crystal medium

A liquid crystal medium comprising

• a) one or more compounds selected from formulae I-1, I-2, and I-3
• in which
• RH denotes H, O•, CH3, OH or ORS,
• Sp on each occurrence, identically or differently, denotes a spacer group, and
• W denotes linear, optionally unsaturated, alkylene having 1 to 12 C atoms or branched, optionally unsaturated, alkylene having 2 to 12 C atoms, in which one or more non-adjacent-CH2-groups may each be replaced with —O—,
• wherein the total concentration of the one or more compounds of formulae I-1, I-2, and I-3 is in the range of from 1000 ppm to 5000 ppm;
• b) one or more compounds selected from the group of compounds of formulae IIA, IIB, and IIC
• in which
• R2A, R2B, and R2C each, independently of one another, denote H, or an alkyl having 1 to 15 C atoms or alkenyl radical having 2 to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where one or more CH2 groups in these radicals may each be replaced by —O—, —S—,
• —C≡C—, —CF2O—, —OCF2—, —OC—O—, or —O—CO— in such a way that O atoms are not linked directly to one another;
• L1 and L2 each, independently of one another, denote F, Cl, CF3 or CHF2;
• Y denotes H, F, Cl, CF3, CHF2, or CH3;
• Z2 and Z2B each, independently of one another, denote a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF—, or —CH═CHCH2O—;
• (O) denotes O or a single bond;
• p denotes 0, 1 or 2;
• q denotes 0 or 1;
• and
• v denotes 1, 2, 3, 4, 5, or 6;
• c) one or more compounds selected from formula IID
• in which
• R2D denotes H, or an alkyl having 1 to 15 C atoms or alkenyl radical having 2 to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where one or more CH2 groups in these radicals may each be replaced by —O—, —S—,
• —C≡C—, —CF2O—, —OCF2—, —OC—O—, or —O—CO— in such a way that O atoms are not linked directly to one another;
• L1 and L2 each, independently of one another, denote F, Cl, CF3 or CHF2;
• Y denotes H, F, CI, CF3, CHF2, or CH3;
• Z2 denotes a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF—, or —CH═CHCH2O—;
• ZD is a single bond;
• (O) denotes O or a single bond;
• q denotes 0 or 1;
• and
• v denotes 1, 2, 3, 4, 5, or 6;
• and
• d) one or more compounds selected from formula IID-10, and/or one or more compounds of formula CL:
• in which
• R2D and (O) have the meanings defined for formula IID, and alkyl denotes n-alkyl having 1 to 5 C atoms,
• RL denotes H, a straight chain alkyl or alkoxy radical having 1 to 15 C atoms, a branched alkyl or alkoxy radical having 2 to 15 C atoms, a straight chain alkenyl radical having 2 to 15 C atoms, or a branched alkenyl radical having 3 to 15 C atoms, where one or more CH2 groups in these radicals may each be 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, in addition, one or more H atoms may each be replaced by halogen,
• XL denotes F, CI, CN, CHF2, CF3, OCF3, or, identically or differently, has one of the meanings of RL, and
• YL denotes H, F, Cl or CH3.