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US 11,453,824 B2Granted
Liquid-crystalline medium
AssigneeMerck Patent GmbH
InventorsHarald Hirschmann, Martina Windhorst
Life of this patent
Estimating the term…
Abstract
The invention relates to a liquid-crystalline medium and to the use thereof for an active-matrix display, in particular based on the VA, PSA, PS-VA, PM-VA, SS-VA, PALC, IPS, PS-IPS, FFS or PS-FFS effect.
Claims30
A liquid-crystalline medium comprising:
- one or more compounds of formula I1, one or more compounds of formula I2, and one or more compounds of formula EY
- in which the individual radicals each, independently of one another, and identically or differently on each occurrence, have one of the following meanings:
- R1 and R1* denote H, an alkyl having 1 to 15 C atoms or alkenyl radical having 2 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 each 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, or a cycloalkyl ring having 3 to 6 C atoms,
- L1 and L2 denote F, Cl, CF3 or CHF2;
- one or more compounds selected from formulae T-1 to T-21,
- in which
- R denotes a straight-chain alkyl or alkoxy radical having 1-7 C atoms or a straight-chain alkenyl radical having 2-7 C atoms,
- m denotes 0, 1, 2, 3, 4, 5 or 6,
- n denotes 0, 1, 2, 3 or 4, and
- (O) denotes an oxygen atom or a single bond, and
- one or more compounds selected from formula BS-2,
- in which
- R1 and R2 each, independently of one another, denote H, an alkyl having 1 to 15 C atoms or alkenyl radical having 2 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 each 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, and
- d denotes 1 or 2,
- with the proviso that the liquid-crystalline medium does not comprise a compound of the formula I3,
14 more elements
Dependencies are inferred from the claim text.