Liquid-crystalline medium and liquid-crystal display comprising the same

Patent metadata

Field	Value
Publication number	US-10190048-B2
Application number	US-201515502725-A
Country	US
Kind code	B2
Filing date	Jul 13, 2015
Priority date	Aug 8, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

The invention relates to a liquid-crystalline medium, preferably having a nematic phase and negative dielectric anisotropy, which comprises
a) one or more compounds of formula I

and
b) one or more compounds selected from the group of compounds of the formulae II and III

in which the parameters have the respective meanings indicated in claim 1 , to the use thereof in an electro-optical display, particularly in an active-matrix display based on the VA, ECB, PALC, IPS or FFS effect, to displays of this type which contain a liquid-crystalline medium of this type, and to the use of the compounds of formula I for reduction of the dispersion of the birefringence of a liquid-crystalline medium which comprises one or more compounds of the formulae II and/or III.

First claim

The invention claimed is:

1. A liquid-crystalline medium comprising
a) one or more compounds selected from the group of compounds of formulae I-1 and I-2

in which
R 11 and R 12 independently of each other denote H or alkyl with 1 to 5 C atoms, and
b) one or more compounds selected from the group of compounds of formulae II and III

in which
R 21 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkenyl radical having 2 to 7 C atoms or an unsubstituted alkoxy radical having 1 to 6 C atoms,
R 22 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms or an unsubstituted alkenyloxy radical having 2 to 6 C atoms, and
l denotes 0 or 1,
R 31 denotes an unsubstituted alkyl radical having 1 to 7 C atoms or an unsubstituted alkenyl radical having 2 to 7 C atoms,
R 32 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms or an unsubstituted alkenyloxy radical having 2 to 6 C atoms, and

denotes

2. The medium according to claim 1 , which comprises a compound of formula I-1.

3. The medium according to claim 1 , which further comprises one or more compounds of formula IV

in which
R 41 denotes an unsubstituted alkyl radical having 1 to 7 C atoms or an unsubstituted alkenyl radical having 2 to 7 C atoms, and
R 42 denotes an unsubstituted alkyl radical having 1 to 7 C atoms or an unsubstituted alkoxy radical having 1 to 6 C atoms.

4. The liquid-crystalline medium according to claim 1 , which further comprises one or more compounds of formula V

in which
R 51 and R 52 , independently of one another, denote an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkenyl radical having 2 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms, or an unsubstituted alkenyloxy radical having 2 to 6 C atoms,

if present, each, independently of one another, denote

Z 51 to Z 53 each, independently of one another, denote —CH 2 —CH 2 —, —CH 2 —O—, —CH═CH—, —C≡C—, —COO— or a single bond, and
i and j each, independently of one another, denote 0 or 1.

5. The liquid-crystalline medium according to claim 1 , wherein the one or more compounds of formula II and/or III are selected from the group of the compounds of formulae II-1, II-2, III-1 and III-2

in which R 21 , R 22 , R 31 , and R 32 as defined as for the compounds of formulae II and III.

6. The liquid-crystalline medium according to claim 5 , in which comprises one or more compounds of formula II selected from the group of the compounds of formulae II-1 and II-2

in which R 21 and R 22 are defined as for the compounds of formula II.

7. The medium according to claim 1 , in which the total concentration of the compounds of formulae I-1 and I-2 in the medium as a whole is 5% or more to 35% or less.

8. The medium according to claim 1 , in which the total concentration of the compounds of formula II in the medium as a whole is 25% or more to 45% or less.

9. The medium according to claim 1 , which additionally comprises one or more chiral compounds.

10. An electro-optical display or electro-optical component, which comprises a liquid-crystalline medium according to claim 1 .

11. A display according to claim 10 , which is based on the VA-, ECB-IPS- or FFS mode.

12. The display according to claim 10 , which contains an active-matrix addressing device.

13. A display according to claim 10 , which is a mobile display.

14. A process for the preparation of a liquid-crystalline medium according to claim 1 , comprising mixing together one or more compounds of formulae I-1 and I-2 with one or more compounds of formula II and/or III.

15. The medium according to claim 1 , which comprises a compound of formula I-2.

16. The medium according to claim 1 , which comprises at least one compound of each of the compounds of formulae I-1 and I-2.

17. The medium according to claim 1 , which comprises at least one compound of each of the compounds of formulae II and III.

18. The medium according to claim 1 , which further comprises one or more compounds of formula IV

in which
R 41 denotes an unsubstituted alkyl radical having 1 to 7 C atoms or an unsubstituted alkenyl radical having 2 to 7 C atoms, and
R 42 denotes an unsubstituted alkyl radical having 1 to 7 C atoms or an unsubstituted alkoxy radical having 1 to 6 C atoms,

and one or more compounds of formula V

in which
R 51 and R 52 , independently of one another, denote an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkenyl radical having 2 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms, or an unsubstituted alkenyloxy radical having 2 to 6 C atoms,

if present, each, independently of one another, denote

Z 51 to Z 53 each, independently of one another, denote —CH 2 —CH 2 —, —CH 2 —O—, —CH═CH—, —C≡C—, —COO— or a single bond, and
i and j each, independently of one another, denote 0 or 1.

19. The medium according to claim 18 , which comprises at least one compound of each of the compounds of formulae II and III.

20. A process for the preparation of a liquid-crystalline medium according to claim 18 , comprising mixing together one or more compounds of formulae I-1 and I-2 with one or more compounds of each of formula II, III, IV and V.

Assignees

• Merck Patent Gmbh

Inventors

• Manabe Atsutaka
• Baran Sven
• Lietzau Lars
• Schuler Brigitte

Classifications

• C09K2019/3422

  the heterocyclic ring being a six-membered ring · CPC title

• C09K2019/305

  Cy-CH=CH-Cy · CPC title

• C09K2019/3027

  Compounds comprising 1,4-cyclohexylene and 2,3-difluoro-1,4-phenylene · CPC title

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K2019/3009

  Cy-Ph · CPC title