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

Patent metadata

Field	Value
Publication number	US-11060029-B2
Application number	US-201716462414-A
Country	US
Kind code	B2
Filing date	Nov 15, 2017
Priority date	Nov 18, 2016
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

The invention relates to a liquid-crystalline medium having a nematic phase comprising one or more compounds of formula Bwherein the parameters have the meaning 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 B for 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. Liquid-crystalline medium having a nematic phase and a dielectric anisotropy (Δε) of 0.5 or more characterized in that it comprises one or more compounds of formula B

in which

n denotes 1 or 2,
R 1 denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, wherein one —CH 2 — group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably by cyclo-propylene or 1,3-cyclopentylene, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl, wherein one —CH 2 — group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably by cyclo-propylene or 1,3-cyclopentylene, and
X 1 denotes F, Cl, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy or fluorinated alkenlyoxy.

2. Medium according to claim 1 , characterized in that it comprises one or more compounds of formula B, which are selected from the group of compounds of formulae B-1 and B-2

in which the parameters have the respective meanings given in claim 1 .

3. Medium according to claim 1 , characterized in that it additionally comprises one or more compounds of formula I:

in which

n denotes 0 or 1,
R 11 and R 12 independently of each other denote 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, wherein in R 11 one —CH 2 — group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclopentenylene, preferably by cyclo-propylene or 1,3-cyclopentylene, and R 11 alternatively denotes R 1 and R 12 alternatively denotes X 1 ,
R denotes alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, wherein one
—CH 2 — group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclo-propylene or 1,3-cyclopentylene, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 C atoms, wherein one
—CH 2 — group may be replaced by cyclo-propylene, 1,3-cyclobutylene, 1,3-cyclopentylene, 1,3-cyclo-pentenylene, preferably by cyclo-propylene or 1,3-cyclopentylene, and

X 1 denotes F, Cl, fluorinated alkyl, fluorinated alkenyl or fluorinated alkoxy having 1 to 7 C atoms or fluorinated alkenyloxy having 2 to 7 C atoms,
from which the compounds of formula B are excluded.

4. Medium according to claim 1 , characterized in that it comprises one or more compounds selected from the group of compounds of formulae II and 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.

5. Liquid-crystalline medium according to claim 1 , characterized in that it comprises one or more dielectrically neutral compounds selected from the group of formulae IV and V:

in which
R 41 and R 42 , independently of one another, denote alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy having 1 to 7 C atoms, alkenyl, alkenyloxy, alkoxyalkyl or fluorinated alkenyl having 2 to 7 atoms,

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.

6. Liquid-crystalline medium according to claim 5 , characterized in that it comprises one or more compounds selected from the group 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,

Assignees

• Merck Patent Gmbh

Inventors

• Manabe Atsutaka
• Brocke Constanze

Classifications

• C09K19/345

  the heterocyclic ring being a six-membered aromatic ring containing two nitrogen atoms · CPC title

• C09K2019/3408

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

• C09K19/3405 Primary

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

• G02F1/13

  based on liquid crystals, e.g. single liquid crystal display cells · CPC title

• C09K19/54

  Additives having no specific mesophase {characterised by their chemical composition} · CPC title