Liquid crystal display
AssigneeMerck Patent GmbH
InventorsGeorg Bernatz, Melanie Klasen-Memmer, Matthias Bremer
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Abstract
The present invention relates to a liquid-crystal (LC) display of the PSA (polymer sustained alignment) type, and to polymerizable compounds and LC media for use in PSA displays.
Claims15
A polymer stabilised or polymer sustained alignment liquid-crystal display, containing a liquid-crystal cell comprising two substrates, where at least one substrate is transparent to light and at least one substrate has an electrode layer, and a layer of a liquid-crystal medium comprising a polymerised component and a low-molecular-weight component located between the substrates, where the polymerised component is obtainable by polymerisation of one or more polymerisable compounds between the substrates of the liquid-crystal cell in the liquid-crystal medium with application of an electrical voltage,
- wherein the low-molecular-weight component comprises one or more compounds of the formula A
- in which
- a1 denotes 0 or 1,
- L1 and L2 each, independently of one another, denote H, F or Cl,
- R1 on each occurrence, identically or differently, denotes —(CH2)m—CH═CH—CnH2n+1,
- R2 denotes alkyl having 1 to 12 C atoms, in which one or two non-adjacent CH2 groups may be replaced by —O—, —CH═CH—, —CO—, —OCO— or —COO— in such a way that O atoms are not linked directly to one another, or, if a1=0 and the ring A1 denotes cyclohexylene, R2 also denotes R1,
- m on each occurrence, identically or differently, denotes 0, 1, 2, 3, 4 or 5, and,
- n on each occurrence, identically or differently, denotes 1, 2, 3, 4, 5 or 6, where n+m≦6.
A liquid-crystal medium comprising:
- a liquid-crystalline component A) comprising one or more compounds of the formula A, and
- a polymerisable component B) comprising one or more polymerisable compounds,
- in which
- denotes
- a1 denotes 0 or 1,
- L1 and L2 each, independently of one another, denote H, F or Cl,
- R1 on each occurrence, identically or differently, denotes —(CH2)m—CH═CH—CnH2n+1,
- R2 denotes alkyl having 1 to 12 C atoms, in which one or two non-adjacent CH2 groups may be replaced by —O—, —CH═CH—, —CO—, —OCO— or —COO— in such a way that O atoms are not linked directly to one another, or, if al ═O and the ring A1 denotes cyclohexylene, R2 also denotes R1,
- m on each occurrence, identically or differently, denotes 0, 1, 2, 3, 4 or 5, and,
- n on each occurrence, identically or differently, denotes 1, 2, 3, 4, 5 or 6, where n+m≦6.
Dependencies are inferred from the claim text.