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

Patent metadata

Field	Value
Publication number	US-11326102-B2
Application number	US-201816644757-A
Country	US
Kind code	B2
Filing date	Sep 5, 2018
Priority date	Sep 8, 2017
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

The invention relates to a liquid-crystalline medium, preferably having a nematic phase and dielectric anisotropy of 0.5 or more, which comprises one or more compounds of formula YXin whichthe parameters have the meanings given in the text,to the use thereof in an electro-optical display, particularly in an active-matrix display based on the 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 YX for the improvement of the transmission and/or response times of a liquid-crystalline medium which comprises one or more additional mesogenic compounds.

First claim

The invention claimed is:

1. A liquid-crystalline medium comprising at least one compound of formula YX

in which

 denote
independently of each other denote

n denotes 0 or 1,
R Y denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms,
X Y denotes F, Cl, CN, NCS, fluorinated alkyl having 1 to 4 C atoms, fluorinated alkenyl having 2 to 4 C atoms, fluorinated alkoxy having 1 to 4 C atoms or fluorinated alkenyloxy having 2 to 4 C atoms, and
Z Y denotes a single bond, —CH═CH—, —C≡C—, —CH 2 —CH 2 —, —CF 2 —O—, CH 2 —O— or —CO—O—

and at least one compound of formulae II or III:

in which
R 2 denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms,

on each appearance, independently of one another, denote

L 21 and L 22 denote H or F,
X 2 denotes halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms,
m denotes 0, 1, 2 or 3,
R 3 denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms

on each appearance, independently of one another, are

L 31 and L 32 , independently of one another, denote H or F,
X 3 denotes halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms, F, Cl, —OCF 3 , —OCHF 2 , —O—CH 2 CF 3 , —O—CH═CF 2 , —O—CH═CH 2 or —CF 3 ,
Z 3 denotes —CH 2 CH 2 —, —CF 2 CF 2 —, —COO—, trans-CH═CH—, trans-CF═CF—, —CH 2 O— or a single bond, and
n denotes 0, 1, 2 or 3.

2. A liquid-crystalline medium according to claim 1 , comprising at least one compound of formula YX, which is a compound of formulae YX-1, YX-2, YX-3 or YX-4:

in which
R Y denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms or alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, and
X Y denotes F, Cl, CN, NCS, fluorinated alkyl having 1 to 4 C atoms, fluorinated alkenyl having 2 to 4 C atoms, fluorinated alkoxy having 1 to 4 C atoms or fluorinated alkenyloxy having 2 to 4 C atoms.

3. A liquid-crystalline medium according to claim 1 , comprising at least one compound of formulae IV or V:

in which
R 41 and R 42 , independently of one another, have the meaning indicated for R 2 under formula II,

independently of one another and, if

 occurs twice,
also these independently of one another, denote

Z 41 and Z 42 , independently of one another and, if Z 41 occurs twice, also these independently of one another, denote —CH 2 CH 2 —, —COO—, trans-CH═CH—, trans-CF═CF—, —CH 2 O—, —CF 2 O—, —C≡C— or a single bond,
p denotes 0, 1 or 2,
R 51 and R 52 , independently of one another, have one of the meanings given for R 41 and R 42

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.

4. A liquid-crystalline medium according to claim 3 , comprising at least one compound of formulae VI to IX:

wherein
R 61 denotes 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,
R 62 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 71 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, or an unsubstituted alkenyl radical having 2 to 7 C atoms,
R 72 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,

denotes

R 81 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, or an unsubstituted alkenyl radical having 2 to 7 C atoms,
R 82 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,

 denotes

Z 8 denotes —(C═O)—O—, —CH 2 —O—, —CF 2 —O— or —CH 2 —CH 2 —,
o denotes 0 or 1,
R 91 and R 92 independently of one another have the meaning given for R 72 above,

 denotes

p and q independently of each other denote 0 or 1.

5. A liquid-crystalline medium according to claim 1 , comprising at least one compound of formula I

in which

 denotes

 denotes

Assignees

• Merck Patent Gmbh

Inventors

• Manabe Atsutaka
• Brocke Constanze
• Schuler Brigitte

Classifications

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K2019/3408

  Five-membered ring with oxygen(s) in fused, bridged or spiro ring systems · CPC title

• C09K19/3098 Primary

  Unsaturated non-aromatic rings, e.g. cyclohexene rings · CPC title

• C09K19/32

  containing condensed ring systems, i.e. fused, bridged or spiro ring systems · CPC title

• C09K19/0403

  the structure containing one or more specific, optionally substituted ring or ring systems · CPC title