Liquid crystal medium

A liquid crystal medium comprising:

• one or more compounds of formula I
• in which
• R1 denotes H, a C1-15-straight chain or C3-15-branched alkyl or alkoxy radical, 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 be replaced by halogen,
• denotes
• Y1 denotes H or CH3,
• n is 1,
• v is 1, 2, 3, 4, 5, or 6;
• one or more compounds of the formulae IIA, IIB, IIC and/or IID,
• in which
• R2A, R2B, R2C and R2D each, independently of one another, denote H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals may 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 to L4 each, independently of one another, denote F, Cl, CF3 or CHF2,
• Y denotes H, F, Cl, CF3, CHF2 or CH3,
• Z2, Z2B and Z2D each, independently of one another, denote a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF— or —CH═CHCH2O—,
• p denotes 0, 1 or 2,
• q denotes 0 or 1, and
• v denotes an integer from 1 to 6;
• one or more compounds of the formula III-1 and/or III-2
• in which
• R11 and R12 each, independently of one another, denote H, an alkyl or alkoxy radical having 1 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—, by —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 be replaced by halogen,
• L11 and L12 each denote F, and
• one or more compounds of formula IV
• in which
• R41 denotes alkyl having 1 to 7 C atoms or alkenyl having 2 to 7 C atoms, and
• R42 denotes alkyl having 1 to 7 C atoms or alkoxy having 1 to 6 C atoms or alkenyl having 2 to 7 C atoms,
• wherein the compounds of formula I are excluded from formula IID,
• wherein the total concentration of compounds of formulae I and IV is 35% to 75%, based on the medium,
• wherein the concentration of compounds of formula I is 2% to 15%, based on the medium, and
• wherein the medium has a birefringence of 0.085 to 0.105, and
• wherein the medium has a dielectric anisotropy of −3.5 to −8.0.