Back to results
US 10,138,420 B2Granted
Polymerisable mesogenic compound, liquid crystal medium and liquid crystal display
AssigneeMerck Patent GmbH
InventorsMichael Wittek, Norihiko Tanaka, Kevin Adlem, Matthias Bremer, David Wilkes, Ming-Chou Wu
Life of this patent
Estimating the term…
Abstract
The present invention relates to liquid crystal media comprising polymerizable mesogenic compounds with a bent shape, and to electro-optical displays comprising these media as light modulation media. In particular the electro-optical displays according to the present invention are displays, which are operated at a temperature, at which the liquid crystal modulation media are in an optically isotropic phase, preferably in a blue phase.
Claims11
A liquid crystal medium comprising
- one or more compounds selected from the following formulae
- P1, P2 independently of each other denote a polymerisable group,
- Sp1, Sp2 independently of each other denote Sp″-O— or —O-Sp″
- Sp″ is alkylene having 1 to 20 C atoms, which is optionally mono- or polysubstituted by F, CI, Br, I or CN and in which, in addition, one or more non-adjacent CH2 groups may each be replaced, independently of one another, by —O—, —S—, —NH—, —N(R0)—, —Si(R00R000)—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, S—CO—, —CO—S—, —N(R00)—CO—O—, —O—CO—N(R00)—, —N(R00)—CO—N(R00)—, —CH═CH— or —C≡C— in such a way that O and/or S atoms are not linked directly to one another,
- L denotes P1-, P1—Sp1-, F, Cl, Br, I, —CN, —NO2, —NCO, —NCS, —OCN, —SCN, —C(═O)N(Rx)2, —C(═O)Y1, —C(═O)Rx, —N(Rx)2, optionally substituted silyl, optionally substituted aryl or heteroaryl having 5 to 20 ring atoms, or straight-chain or branched alkyl having 1 to 25, particularly preferably 1 to 10, C atoms, in which, in addition, one or more non-adjacent CH2 groups may each be replaced, independently of one another, by —C(R00)═C(R000)—, —C≡C—, —N(R00)—, —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— in such a way that O and/or S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F, Cl, CN, P1 or —Sp1-,
- R00 and R000 each, independently of one another, denote H or alkyl having 1 to 12 C atoms,
- Y1 is halogen,
- Rx denotes P1, P1—Sp1-, H, halogen, straight chain, branched or cyclic alkyl having 1 to 25 C atoms, wherein one or more non-adjacent CH2-groups are optionally replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— in such a manner that O- and/or S-atoms are not directly connected with each other, and wherein one or more H atoms are optionally replaced by F, Cl, P1- or P1—Sp1-, optionally substituted aryl, aryloxy, heteroaryl or heteroaryloxy having 5 to 20 ring atoms,
- r is 1, 2 or 3
- and further comprising one or more compounds selected from the group of formulae I-A, I-E, I-N and I-T
- wherein
- R0 has the meaning of R1,
- R1 is alkyl, which is straight chain or branched, preferably has 1 to 20 C-atoms, is unsubstituted, mono- or poly-substituted by F, Cl or CN, preferably by F, and in which one or more CH2 groups are optionally replaced, in each case independently from one another, by —O—, —S—, —NR01—, —SiR01R02—, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—,
- —CO—S—, —CY01═CY02— or —C≡C—in such a manner that O and/or S atoms are not linked directly to one another, preferably n-alkyl or n-alkoxy with 1 to 9 C-atoms, preferably with 2 to 5 C-atoms, alkenyl, alkenyloxy or alkoxyalkyl with 2 to 9 C-atoms, preferably with 2 to 5 C-atoms or halogenated alkyl, halogenated alkenyl or halogenated alkoxy with preferably up to 9 C-atoms, preferably mono fluorinated, di-fluorinated or oligofluorinated alkyl, alkenyl or alkoxy with preferably up to 9 C-atoms, most preferably n-alkyl, n-alkoxy, alkenyl, alkenyloxy or alkoxyalkyl with preferably up to 9 C-atoms, and
- L1 to L03, L1, L11 and L12 are independently of one another H or F.
12 more elements
Dependencies are inferred from the claim text.