Liquid-crystalline medium and liquid-crystal display comprising the same
AssigneeMerck Patent GmbH
InventorsAtsutaka Manabe, Constanze Brocke, Sebastian Hofmeyer
Life of this patent
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Abstract
A liquid-crystalline medium, preferably having a nematic phase and dielectric anisotropy of 0.5 or more, which comprises one or more compounds of each of formulae T and L in which the parameters have the meanings given in the claims and in the text. The use thereof in an electro-optical display, particularly in an active-matrix display based on the IPS or FFS effect, to displays of this type which contain a liquid-crystalline medium of this type. Also, the compounds of formulae T and L and their use for the improvement of the transmission and/or response times of a liquid-crystalline medium which comprises one or more additional mesogenic compounds.
Claims21
A liquid-crystalline medium which comprises:
- one or more compounds of formula T
- in which
- RS1 denotes optionally fluorinated alkyl or optionally fluorinated alkoxy having 1 to 7 C atoms, wherein one —CH2— group is optionally replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene or 1,3-cyclo-pentenylene, or alkenyloxy, alkoxyalkyl or optionally fluorinated alkenyl having 2 to 7 C atoms, wherein one —CH2— group is optionally replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, or 1,3-cyclo-pentenylene,
- RS2 denotes optionally fluorinated alkyl or optionally fluorinated alkoxy having 1 to 7 C atoms, wherein one —CH2— group is optionally replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene or 1,3-cyclo-pentenylene, or optionally fluorinated alkenyloxy, alkoxyalkyl or optionally fluorinated alkenyl having 2 to 7 C atoms, wherein one —CH2— group is optionally replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, or 1,3-cyclo-pentenylene, or denotes, F, Cl, CN, or NCS, and
- YS1 and YS2 independently of one another, denote H or F, and
- wherein one or more of the aromatic rings in formula T are optionally substituted by an alkyl group;
- and
- one or more compounds of formula L
- in which
- RL1 denotes optionally fluorinated alkyl or optionally fluorinated alkoxy having 1 to 7 C atoms, wherein one —CH2— group are optionally replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, or 1,3-cyclo-pentenylene, or optionally fluorinated alkenyl, or alkenyloxy or alkoxyalkyl of 2 to 7 C atoms, wherein one —CH2— group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene or 1,3-cyclo-pentenylene,
- RL2 denotes optionally fluorinated alkyl or optionally fluorinated alkoxy having 1 to 7 C atoms, wherein one —CH2— group is optionally replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, or 1,3-cyclo-pentenylene, or optionally fluorinated alkenyl, optionally fluorinated alkenyloxy or alkoxyalkyl of 2 to 7 C atoms, wherein one —CH2— group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene or 1,3-cyclo-pentenylene, or denotes F, Cl, CN, or NCS, and
- YL1 and YL2 independently of one another, denote H or F, and
- wherein the aromatic ring in formula L is optionally further substituted by an alkyl group.
Dependencies are inferred from the claim text.