Liquid-crystalline medium

A liquid-crystalline medium comprising at least two liquid crystalline compounds, wherein said medium comprises one or more compounds of Formula I

• wherein
• R1 and R2 are each, independently of one another, a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals are each, independently of one another, optionally replaced by —C≡C—, —CF2O—, —CH═CH—,
• —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and
• X1-12 are each, independently of one another, H or F, wherein at least one of the radicals X1-12 is F;
• and
• said medium further comprises one or more compounds selected from the following formula:
• wherein
• R1′ and R2′ are each, independently of one another, a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals are each, independently of one another, be optionally replaced by —C≡C—, —CF2O—, —CH═CH—,
• —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and
• at least one of R1′ and R2′ is alkenyl having 2 to 7 C atoms.

A liquid-crystalline medium comprising at least two liquid crystalline compounds, wherein said medium comprises one or more compounds of Formula I

• wherein
• R1 and R2 are each, independently of one another, a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals are each, independently of one another, optionally replaced by —C≡C—, —CF2O—, —CH═CH—,
• —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and
• X2, X4, X6, X8, X10 and X12 are each H,
• X1, X3, X5, X7, X9 and X11 are each, independently of one another, H or F,
• one or two of the radicals X1, X5 and X9 is F and one or two of the radicals X3, X7 and X11 is F,
• X3 and X5 are not simultaneously F, and
• X7 and X9 are not simultaneously F;
• and
• wherein said medium further comprises one or more compounds selected from the following formulae:
• wherein
• Y1-4 are each, independently of one another, H or F,
• R0 is a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals are each, independently of one another, optionally replaced by —C≡C—, —CF2O—, —CH═CH—,
• —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another,
• X0 is F, Cl, CN, SF5, SCN, NCS, halogenated alkyl having up to 6 C atoms, halogenated alkenyl having up to 6 C atoms, halogenated alkoxy having up to 6 C atoms, or halogenated alkenyloxy having up to 6 C atoms, and
• Z0 is —C2H4—, —(CH2)4—, —CH═CH—, —CF═CF—, —C2F4—, —CH2CF2—, —CF2CH2—, —CH2O—, —OCH2—, —COO— or —OCF2—, in formulae V and VI also a single bond, in formulae V and VIII also —CF2O—, and
• r is 0 or 1.