Liquid-crystalline medium

Patent metadata

Field	Value
Publication number	US-2017306232-A1
Application number	US-201715492431-A
Country	US
Kind code	A1
Filing date	Apr 20, 2017
Priority date	Apr 21, 2016
Publication date	Oct 26, 2017
Grant date	—

Abstract

The invention relates to a liquid-crystalline medium and to the use thereof for an active-matrix display, in particular based on the VA, PSA, PS-VA, PM-VA, SS-VA, PALC, IPS, PS-IPS, FFS or PS-FFS effect.

First claim

1 . A liquid-crystalline medium comprising a compound of the formula I1 and/or a compound of the formula I2, and one or more compounds of the formula EY

in which the individual radicals each, independently of one another, and identically or differently on each occurrence, have one of the following meanings:
R 1 and R 1 * denote H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may each be replaced by —O—, —S—,

—C≡C—, —CF 2 O—, —OCF 2 —, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, or a cycloalkyl ring having 3 to 6 C atoms,
L 1 and L 2 denote F, Cl, CF 3 or CHF 2 ,
with the proviso that the liquid-crystalline medium does not comprise a compound of the formula I3,

2 . A liquid-crystalline medium according to claim 1 , wherein said one or more compounds of formula EY are selected from the group of compounds of the following formulae:

3 . A liquid-crystalline medium according to claim 1 , further comprising one or more compounds selected from the group of compounds of formulae IIA, IIB and IIC,

in which
R 2A , R 2B and R 2C each, independently of one another, denote H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may each be replaced by —O—, —S—,

—C≡C—, —CF 2 O—, —OCF 2 —, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another,
L 1-4 each, independently of one another, denote F or Cl,
Z 2 and Z 2′ each, independently of one another, denote a single bond, —CH 2 CH 2 —, —CH═CH—, —CF 2 O—, —OCF 2 —, —CH 2 O—, —OCH 2 —, —COO—, —OCO—, —C 2 F 4 —, —CF═CF—, or —CH═CHCH 2 O—,
p denotes 1 or 2,
q denotes 0 or 1, and
v denotes an integer from 1 to 6.

4 . A liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more compounds of formula III,

in which
R 31 and R 32 each, independently of one another, denote a straight-chain alkyl, alkoxyalkyl or alkoxy radical having up to 12 C atoms,

denotes

or

and
Z 3 denotes a single bond, —CH 2 CH 2 —, —CH═CH—, —CF 2 O—, —OCF 2 —, —CH 2 O—, —OCH 2 —, —COO—, —OCO—, —C 2 F 4 —, —C 4 H 9 —, or —CF═CF—.

5 . A liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more terphenyls of formulae T-1 to T-21,

in which
R denotes a straight-chain alkyl or alkoxy radical having 1-7 C atoms or a straight-chain alkenyl radical having 2-7 C atoms,
m denotes 0, 1, 2, 3, 4, 5 or 6,
n denotes 0, 1, 2, 3 or 4, and
(O) denotes an oxygen atom or a single bond.

6 . A liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more compounds of formulae O-1 to O-17,

in which
R 1 and R 2 each, independently of one another, denote H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may each be replaced by —O—, —S—,

—C≡C—, —CF 2 O—, —OCF 2 —, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and
the compounds of the formula O-17 are not identical with the compounds of the formulae I1 and I2.

7 . A liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more indane compounds of formula In,

In
in which
R11, R12, R13 denote a straight-chain alkyl, alkoxy, alkoxyalkyl or alkenyl radical having 1-6 or 2-6 C atoms respectively,
R12 and R13 additionally also denote halogen,

denotes

i denotes 0, 1 or 2.

8 . A liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more biphenyls selected from formulae B-1a, B-2a, B-2b, and B-2c:

in which alkyl* denotes an alkyl radical having 1-6 C atoms.

9 . A liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more compounds selected from the group of the following compounds:

10 . A liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more compounds selected from the group of the following compounds:

11 . A liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more compounds selected from the group of the compounds of formulae BC, CR, PH-1, PH-2, BF-1, BF-2, BS-1 and BS-2,

in which
RB1, RB2, RCR1, RCR2, R1, R2 each, independently of one another, denote H, an alkyl or alkenyl radical having up to 15 C atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals may each be replaced by —O—, —S—,

Assignees

• Merck Patent Gmbh

Inventors

• Hirschmann Harald
• Windhorst Martina

Classifications

• G02F1/133365

  Cells in which the active layer comprises a liquid crystalline polymer · CPC title

• C09K19/3003

  Compounds containing at least two rings in which the different rings are directly linked (covalent bond) · CPC title

• G02F1/1362

  Active matrix addressed cells {(G02F1/134336, G02F1/134363 take precedence)} · CPC title

• C09K19/542

  Macromolecular compounds · CPC title

• C09K2019/3009

  Cy-Ph · CPC title