Liquid-crystal medium

A liquid crystal medium comprising one or more compounds of formula

• and
• one or more compounds of formula III
• and/or
• one or more compounds of formula BC
• and/or
• one or more compounds of formula PH-1
• in which
• R11, R31, R32, R81, and R82 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 one or more H atoms may be replaced by halogen,
• R12 denotes an alkenyl radical having 2 to 12 C atoms,
• A3 on each occurrence, independently of one another, denotes a 1,4-phenylene radical, in which one or two CH groups may be replaced by N, or a 1,4-cyclohexylene or 1,4-cyclohexenylene radical, in which one or two non-adjacent CH2 groups may be replaced by —O— or —S—, where the radicals may be mono- or polysubstituted by halogen atoms,
• n denotes 0, 1 or 2,
• Z3 on each occurrence independently of one another denotes —CF2O—, —OCF2—, —CH2O—, —OCH2—, —CH2—, —CH2CH2—, —CH═CH—, —C═C— or a single bond,
• L31 and L32, each, independently of one another, denote F, Cl, CF3 or CHF2, and
• Y1, Y2, Y3, Y4, each, independently of one another, denote H, F, Cl, CF3, CHF2, CH3 or OCH3.