Patent ID: 7981487

Claim:
A liquid-crystalline medium, comprising at least one compound of formula IA and at least one compound of formula IB, IC and/or ID in which R 1A denotes CH 3 CH═CH, C 2 H 5 CH═CH, C 3 H 7 CH═CH, CH 2 ═CHC 2 H 4 , CH 3 CH═CHC 2 H 4 , CH 2 ═CHCH 2 , CH 3 CH═CHCH 2 , or C 2 H 5 CH═CHCH 2 , R 1B denotes an alkenyl radical having up to 6 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, in which one or more CH 2 groups are optionally replaced by —O—, —S—, —C≡C—, —CF 2 O—, —OCF 2 —, —OC—O— or —O—CO—in such a way that O atoms are not linked directly to one another, R 2A , R 2B , R 1C , R 1D and R 2D each, independently of one another, denote an alkyl or alkenyl radical having up to 6 C atoms which is un-substituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, in which one or more CH 2 groups are optionally replaced by —O—, —S—, —C≡C—, —CF 2 O—, —OCF 2 —, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and each, independently of one another, denote Y 1 , Y 2 , Y 4 and Y 5 each, independently of one another, denote F, Cl, CF 3 , CHF 2 , CH 2 F, OCF 3 , OCH 2 F, OCHF 2 or CN, Y 3 denotes H or CH 3 , R 2C denotes H or F, R 3C denotes H, CH 3 , C 2 H 5 or n-C 3 H 7 , a denotes 2, b denotes 0, c denotes 1 or 2, and d denotes 0 or 1.