Liquid crystalline medium

A liquid-crystalline medium based on a mixture of polar compounds having negative dielectric anisotropy (Δ∈), which has a value for the ratio γ1/Δn2 in the range 6-45 Pa·s with a clearing point of >60° C. and a Δ∈ of ≦−2.3, and comprises

• at least one compound of formula B-4
• and
• at least one compound of formula IB
• and
• at least one compound of formula II
• and
• optionally at least one compound of formula IA
• in which
• alkyl each, independently of one another, denote a straight-chain alkyl radical having 1-6 C atoms;
• R1 and R2 each, independently of one another, denote H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, in which one or more CH2 groups are each, independently of one another, optionally replaced by —O—, —S—,
• —C≡C—, —CF2O—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a way that O atoms are not linked directly to one another, and
• v denotes 1 to 6,
• and
• at least one of the following compounds from groups A, B, or C:
• A)
• one or more compounds of the following formulae T-1 to T-22
• in which
• R denotes H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, in which one or more CH2 groups are optionally replaced by —O—, —S—,
• —C≡C—, —OCF2—, —CF2O—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another;
• B)
• one or more compounds of the following formulae To-1 and To-2
• in which
• R denotes H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, in which one or more CH2 groups are optionally replaced by —O—, —S—,
• —C≡C—, —OCF2—, —CF2O—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and
• alkyl denotes a straight-chain alkyl radical having 1-6 C atoms;
• C)
• the following compound
• wherein alkyl* denotes a straight-chain alkyl radical having 1-6 C atoms.