| 摘要 |
The invention relates to a liquid-crystalline medium which comprises at least one compound of the formula I,;
in which
R1, R1*, L1, L2 and L3 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, PA-VA, PALC, FFS, PS-FFS, IPS or PS-IPS effect. The invention furthermore also relates to compounds of the formula I. |
| 主权项 |
1. Liquid-crystalline medium based on a mixture of polar compounds, characterised in that it comprises
a) at least one compound of the formula I, in which R1 and R1* each, independently of one another, denote a straight chain alkyl or straight chain alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals may each be replaced, independently of one another, by —C≡C—, —CF2O—, —CH═CH—,—O—, —CO—O—, —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 may be replaced by halogen, and
L1, L2 and L3 each, independently of one another, denote F, Cl, CF3, OCF3 or CHF2 and b) one or more compounds selected from the group of the compounds of the formulae IIA, IIB and IIC, in which R2A, R2B and R2C each, independently of one another, denote H, 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 may be 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,
L1-4 each, 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—, —CH═CHCH2O—, p denotes 1 or 2, q denotes 0 or 1, and v denotes 1 to 6. |
