| 摘要 |
The invention relates to a liquid-crystalline medium which comprises at least one compound of the formula I,;
in which
R1, R1*, ring A have the meanings indicated in claim 1,and to the use thereof for an active-matrix display, in particular based on the VA, PSA, PS-VA, PALC, FFS or IPS effect. |
| 主权项 |
1. A liquid-crystalline medium comprising a mixture of polar compounds, wherein said medium comprises:
at least one compound of formula I, in which
R1 and R1* each, independently of one another, denote an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals are each optionally replaced, independently of one another, 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 in which, in addition, one or more H atoms are each optionally replaced by halogen, andring A denotes a 1,4-cyclohexylene ring or 1,4-cyclohexenylene ring, in which, in addition, one or two CH2 groups are each optionally replaced by —O— or — S—,and one or more compounds selected from the compounds of formulae IIA, IIB and IIC, in which
R2A, R2B and R2C each, independently of one another, denote H or an alkyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals are each optionally replaced by —O—, —S—, —C≡C—, —CF2O—, —OCF2—, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another,L1-4each, independently of one another, denote F or Cl,Z2 and Z2′ each, independently of one another, denote a single bond, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —C2F4—, —CF═CF—, or —CH═CHCH2O—,p denotes 1 or 2,q denotes 0 or 1, andv denotes 1 to 6. |
