Ferroelectric nematic liquid crystalline medium

A ferroelectric nematic liquid crystalline medium comprising one or more compounds of formula IA,

• wherein
• X1A denotes —CN, F or —NCS,
• Z1A and Z2A independently of one another are —(CO)—O— or —CF2—O— or a single bond,
• L1A is H or CH3,
• L2A independently, is F or H,
• L3A independently, is F or H,
• L4A independently, is F or H,
• A1A denotes
• R1A independently is an alkyl radical having 1 to 12 C atoms, where, in addition, one or more CH2 groups in these radicals may in each case be replaced, independently of one another, by —C≡C—, —CF2—O—, —OCF2—, —CH═CH—,
• —O—, —S—, —(CO)—O— or —O—(CO)— in such a way that O/S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by halogen, or denotes H,
• n1, n2 independently are 0 or 1, and
• n3 is 2 or 3, while if n1+n2+n3 is 2, one or more of A1A is