Liquid crystalline medium and electro-optical device
AssigneeMerck Patent GmbH
InventorsMatthias Bremer, Atsutaka Manabe, Martin Kraska
Life of this patent
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Abstract
The new media exhibit a ferroelectric nematic phase preferably at ambient temperature. They preferably comprise one or more compounds selected from the group of compounds of formulae IA, IB and IC, in which the variable groups have the meanings indicated in the text and in the claims. Use of the media for providing ferroelectric nematic materials and a method of operation of an electro-optical device are presented. The media may be useful for energy-saving displays and electrical appliances.
Claims18
A liquid crystalline medium exhibiting a ferroelectric nematic phase at 20° C., and comprising 50% to 100% by weight in total of one or more compounds of formulae IA, IB and/or IC
- in which
- X1A, X1B and X1C independently of each other denote —F, —OCF3, —Cl, —NCS, or —CN,
- Z1A, Z1B and Z1C independently of each other denote —(C═O)—O— or —CF2—O—,
- L1A, L1B and L1C independently of each other denote H or CH3,
- A1A denotes
- A1B denotes
- A1C denotes
- R1A, R1B and R1C independently of one another denote an alkyl radical having 1 to 15 C atoms, in which one or more CH2 groups may in each case be replaced, independently of one another, by —C≡C—, —CF2O—, —OCF2—, —CH═CH—,
- —O—, —S—, —CO—O— or —O—CO— in such a way that O/S atoms are not linked directly to one another, and in which one or more H atoms may be replaced by halogen, or denotes H.
A liquid crystalline medium comprising at least 25% by weight of one or more compounds of formula IA, and one or more compounds of formulae IB and/or IC,
- in which
- X1A, X1B and X1C denote —CN,
- Z1A, Z1B and Z1C independently of each other denote —(C═O)—O— or —CF2—O—,
- L1A, L1B and L1C independently of each other denote H or CH3,
- A1A denotes
- A1B denotes
- A1C denotes
- R1A, R1B and R1C independently of one another denote an alkyl radical having 1 to 15 C atoms, in which one or more CH2 groups may in each case be replaced, independently of one another, by —C≡C—, —CF2O—, —OCF2—, —CH═CH—,
- —O—, —S—, —CO—O— or —O—CO— in such a way that O/S atoms are not linked directly to one another, and in which one or more H atoms may be replaced by halogen, or denotes H.
A liquid crystalline medium exhibiting a ferroelectric nematic phase over a temperature range that encompasses 0° C. to 40° C., and comprising 50% to 100% by weight in total of one or more compounds of formulae IA, IB and/or IC
- in which
- X1A, X1B and X1C independently of each other denote —F, —OCF3, —Cl, —NCS, or —CN,
- Z1A, Z1B and Z1C independently of each other denote —(C═O)—O— or —CF2—O—,
- L1A, L1B and L1C independently of each other denote H or CH3,
- A1A denotes
- A1B denotes
- A1C denotes
- R1A, R1B and R1C independently of one another denote an alkyl radical having 1 to 15 C atoms, in which one or more CH2 groups may in each case be replaced, independently of one another, by —C≡C—, —CF2O—, —OCF2—, —CH═CH—,
- —O—, —S—, —CO—O— or —O—CO— in such a way that O/S atoms are not linked directly to one another, and in which one or more H atoms may be replaced by halogen, or denotes H.
Dependencies are inferred from the claim text.