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

Patent metadata

Field	Value
Publication number	US-10774061-B2
Application number	US-201816021657-A
Country	US
Kind code	B2
Filing date	Jun 28, 2018
Priority date	Jun 30, 2017
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

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 S

in which

denotes

and 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 S 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 one or more compounds of formula S

in which

 denotes

 denotes, in each occurrence independently of each other,

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

2. The medium according to claim 1 , wherein the one or more compounds of formula S are selected from the group consisting of compounds of formulae S-1 and S-2:

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

3. The medium according to claim 2 , comprising one or more compounds of formula formulae S-1 and one or more compounds of formula S-2.

4. The medium according to claim 1 , further comprising one or more compounds of formulae II and/or III:

in which
R 2 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,

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, or 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. The medium according to claim 1 , further comprising one or more compounds of formulae IV and/or V:

in which
R 41 and R 42 each, independently of one another, 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,

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 each, independently of one another, 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,

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, denotes 0 or 1.

6. The medium according to claim 5 , further comprising one or more compounds 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
I 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 each, independently of one another denotes an unsubstituted alkyl radical having 1 to 7 C atoms, an unsubstituted alkoxy radical having 1 to 6 C atoms or an unsubstituted alkenyl

Assignees

• Merck Patent Gmbh

Inventors

• Manabe Atsutaka
• Brocke Constanze
• Schuler Brigitte
• Tavakoli Ramin

Classifications

• C09K19/3402

  having oxygen as hetero atom (sugars C09K19/0422) · CPC title

• C09K19/3066

  in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers · CPC title

• C09K19/3491 Primary

  having sulfur as hetero atom · CPC title

• C09K19/52

  characterised by components which are not liquid crystals, e.g. additives {with special physical aspect: solvents, solid particles} · CPC title

• G02F1/13

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