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

Patent metadata

Field	Value
Publication number	US-11795398-B2
Application number	US-202017624721-A
Country	US
Kind code	B2
Filing date	Jul 2, 2020
Priority date	Jul 5, 2019
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

The invention relates to a liquid-crystalline medium having a nematic phase comprising one or more compounds of formula X

wherein 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 X for improvement of the transmission and/or response times of a liquid-crystalline medium which comprises one or more additional mesogenic compounds, as well as to the compounds of formula X.

First claim

The invention claimed is:

1. A liquid crystalline medium having a nematic phase and a dielectric anisotropy (Δε) of 0.5 or more, comprising:
one or more compounds selected from formulae X-2-2 and X-2-4

in which
R 1X denotes H, an alkyl radical having 1 to 15 C atoms, wherein one or more CH 2 groups in these radicals may each be replaced, independently of one another, by —C≡C—, —CF 2 O—, —OCF 2 —, —CH═CH—,

O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may each be replaced by halogen,

Y 1 denotes Cl, CF 3 , CHF 2 , OCF 3 , CN or NCS,
and
one or more additional compounds.

2. The medium according to claim 1 , further comprising one or more compounds of formula B and/or formula S,

in which

denotes

denotes

n denotes 1 or 2,
denotes alkyl, alkoxy, fluorinated alkyl, fluorinated alkoxy, alkenyl, alkenyloxy, alkoxyalkyl, or fluorinated alkenyl and
X 1 denotes F, Cl, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy, or fluorinated alkenlyoxy,

in which

denotes

denotes

n denotes 1 or 2,
R 1 denotes alkyl, alkoxy, fluorinated alkyl, fluorinated alkoxy, alkenyl, alkenyloxy, alkoxyalkyl, or fluorinated alkenyl, and
X 1 denotes F, Cl, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy, or fluorinated alkenlyoxy.

3. The medium according to claim 1 , further comprising one or more compounds of formula I:

in which

denotes

denotes

n denotes 0 or 1,
R 11 and R 12 independently of each other denote alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy, alkenyl, alkenyloxy, alkoxyalkyl, or fluorinated alkenyl having 2 to 7 C atoms, and R 11 alternatively denotes R 1 and R 12 alternatively denotes X 1 ,
R 1 denotes alkyl, alkoxy, fluorinated alkyl, or fluorinated alkoxy, or alkenyl, alkenyloxy, alkoxyalkyl, or fluorinated alkenyl having 2 to 7 C atoms, and
X 1 denotes F, Cl, fluorinated alkyl, fluorinated alkenyl, fluorinated alkoxy, or fluorinated alkenyloxy.

4. The medium according to claim 1 , further comprising 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, 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, 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 liquid-crystalline medium according to claim 1 , further comprising 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, 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 , independently of one another, denote alkyl, alkoxy, fluorinated alkyl, or fluorinated alkoxy having 1 to 7 C atoms, or alkenyl, alkenyloxy, alkoxyalkyl, or fluorinated alkenyl having 2 to 7 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.

6. The liquid-crystalline medium according to claim 5 , further comprising one or more compounds selected from the group of formulae VI to IX:

Assignees

• Merck Patent Gmbh

Inventors

• Manabe Atsutaka
• Brocke Constanze
• Schuler Brigitte

Classifications

• G02F1/1333

  Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence) · CPC title

• C09K19/30

  containing saturated or unsaturated non-aromatic rings, e.g. cyclohexane rings · CPC title

• C09K19/3048

  in which at least two rings are linked by a carbon chain containing carbon to carbon double bonds · CPC title

• C09K19/12 Primary

  at least two benzene rings directly linked, e.g. biphenyls · CPC title

• C09K19/3402 Primary

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