Liquid crystalline medium and liquid crystal display

A liquid crystal medium comprising:

• a first dielectrically positive component, component A, comprising at least one dielectrically positive compound of the formula
• a second dielectrically positive component, component B, comprising one or more dielectrically positive compounds having a dielectric anisotropy of more than 3;
• and
• optionally a dielectrically neutral component, component C, comprising one or more dielectrically neutral compounds having a dielectric anisotropy of −1.5 to 3;
• wherein component B comprises one or more compounds selected from formulae II-1a to II-1i, and optionally one or more compounds of formula III
• wherein
• R2 and R3 are, independently of each other, alkyl having 1 to 7 C-atoms, alkoxy having 1 to 7 C-atoms, fluorinated alkyl having 1 to 7 C-atoms, fluorinated alkoxy having 1 to 7 C-atoms, alkenyl having 2 to 7 C-atoms, alkenyloxy having 2 to 7 C-atoms, alkoxyalkyl having 2 to 7 C-atoms, or fluorinated alkenyl having 2 to 7 C-atoms,
• are, independently of each other,
• L21, L22, L23, L24, L31 and L32 are, independently of each other, H or F,
• X2 and X3 are, independently of each other, halogen, halogenated alkyl having 1 to 3 C-atoms, halogenated alkoxy having 1 to 3 C-atoms, halogenated alkenyl having 2 to 3 C-atoms, or alkenyloxy having 2 or 3 C-atoms, and
• Z3 is —CH2CH2—, —CF2CF2—, —COO—, trans- —CH═CH—, trans- —CF═CF—, —CH2O— or a single bond, and
• n and o are, independently of each other, 0 or 1.