Ferroelectric nematic liquid crystalline medium

A liquid crystalline medium comprising

• 15% by weight or more of one or more compounds of formula IA,
• 15% by weight or more of one or more of compounds of formula IB,
• and
• 15% by weight or more of one or more compounds selected from formula IC-1 to IC-3,
• in which
• X1B denotes —CN or —NCS,
• X1C denotes —CN, F, CF3, —OCF3, —NCS, SF5 or O—CF═CF2,
• Z1A and Z1B independently of one another denote —(CO)—O— or —CF2—O— or a single bond,
• Z2A and Z2B independently of one another denote a single bond, —(CO)—O— or —CF2—O—,
• Z1C and Z2C one of the both of these groups denotes —(CO)—O— or —CF2—O— and the other a single bond,
• L1A, L1B and L1C independently of each other denote H or CH3,
• L2A is F or H,
• L2C is F or H,
• A1A denotes
• A1B denotes
• wherein
• L8B denotes alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms, or alkoxyalkyl having 2 to 7 C atoms,
• A1C denotes
• A2C denotes
• m, n is 0, 1 or 2, where (m+n) is 2,
• R1A, R1B and R1C independently of each another denote an alkyl radical having 1 to 12 C atoms, in which one or more CH2 groups 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 one or more H atoms may each be replaced by halogen, or denotes H;
• and wherein
• said medium exhibits a ferroelectric nematic phase, and
• the concentration of the compounds of formulae IA, IB, IC-1, IC-2 and IC-3 in sum, which are present, is 80% to 100% by weight.

A liquid crystalline medium consisting of 15% by weight or more of one or more compounds of formula IA,

• 15% by weight or more of one or more of compounds of formula IB,
• and
• 15% by weight or more of one or more compounds selected from formula IC-1 to IC-3,
• in which
• X1B denotes —CN or —NCS,
• X1C denotes —CN, F, CF3, —OCF3, —NCS, SF5 or O—CF═CF2,
• Z1A and Z1B independently of one another denote —(CO)—O— or —CF2—O— or a single bond,
• Z2A and Z2B independently of one another denote a single bond, —(CO)—O— or —CF2—O—,
• Z1C and Z2C one of the both of these groups denotes —(CO)—O— or —CF2—O— and the other a single bond,
• L1A, L1B and L1C independently of each other denote H or CH3,
• L2A is F or H,
• L2C is F or H,
• A1A denotes
• A1B denotes
• wherein
• L8B denotes alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms, or alkoxyalkyl having 2 to 7 C atoms,
• A1C denotes
• A2C denotes
• m, n is 0, 1 or 2, where (m+n) is 2,
• R1A, R1B and R1C independently of each another denote an alkyl radical having 1 to 12 C atoms, in which one or more CH2 groups 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 one or more H atoms may each be replaced by halogen, or denotes H;
• and
• wherein said medium exhibits a ferroelectric nematic phase.