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US 9,428,694 B2Granted
Liquid crystal medium
AssigneeMerck Patent GmbH
InventorsMartin Engel, Melanie Klasen-Memmer, Christoph Marten, Stephan Derow
Life of this patent
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Abstract
The present invention relates to a liquid crystal (LC) medium, to its use for optical, electro-optical and electronic purposes, in particular in LC displays, especially in LC displays of the PS (“polymer sustained”) or PSA (“polymer sustained alignment”) type, and to LC displays, especially PS or PSA displays, comprising said LC medium.
Claims26
An LC medium comprising
- a polymerised or polymerisable component A comprising one or more polymerised or polymerisable compounds, and
- a liquid crystalline component B, comprising one or more, monomeric and unpolymerisable compounds selected from mesogenic or liquid crystal compounds,
- wherein component B comprises one or more compounds of formula I
- wherein
- denotes
- R1 and R2 each, independently of one another, denote alkyl having 1 to 12 C atoms, where one or two non-adjacent CH2 groups are optionally replaced by —O—, —CH═CH—, —CO—, —OCO— or —COO— in such a way that O atoms are not linked directly to one another,
- L1-4 each, independently of one another, denote F, Cl, OCF3, CF3, CH3, CH2F or CHF2,
- and component B optionally comprises one or more other monomeric and unpolymerisable compounds,
- provided that the LC medium does not contain a terphenyl compound wherein one or more phenyl rings are fluorinated in 2- and/or 3 position.
6 more elements
Dependencies are inferred from the claim text.