Liquid crystalline medium and liquid crystalline display

Patent metadata

Field	Value
Publication number	US-9212309-B2
Application number	US-201013517334-A
Country	US
Kind code	B2
Filing date	Nov 29, 2010
Priority date	Dec 21, 2009
Publication date	Dec 15, 2015
Grant date	Dec 15, 2015

Abstract

The present invention relates to dielectrically positive liquid-crystalline media comprising one or more compounds of the formula I

in which the parameters have the respective meanings indicated in the specification, and optionally one or more further dielectrically positive compounds and optionally one or more further dielectrically neutral compounds, and to liquid-crystal displays containing these media, especially to active-matrix displays and in particular to TN, IPS and FFS displays.

First claim

The invention claimed is:

1. Liquid-crystal medium, wherein the medium comprises
one or more compounds of formula I

in which
R 1 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,
L 11 denotes H, L 12 denotes H or F, and L 13 denotes F, or
L 11 denotes F, L 12 denotes F and L 13 denotes F, and
X 1 denotes F, Cl, —CFH 2 , —CF 2 H, —CF 3 , —OCF 2 H or —OCF 3 .

2. Medium according to claim 1 , wherein the medium comprises
one or more compounds selected from the group of the compounds of the formulae II and III:

in which
R 2 and R 3 , 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 C atoms,

 on each appearance, independently of one another, denote

L 21 , L 22 , L 31 and L 32 , independently of one another, denote H or F,
X 2 and X 3 , independently of one another, denote halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms,
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
m and n, independently of one another, denote 0, 1, 2 or 3,
where the compounds of the formula I according to claim 1 are excluded from the compounds of the formula II.

3. Medium according to claim 1 , wherein the medium comprises
one or more compounds of the formula IV

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 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, and
p denotes 0, 1 or 2.

4. Medium according to claim 1 , wherein the total concentration of the compounds of the formula I in the medium is in the range from 1% to 50%.

5. Medium according to claim 2 , wherein the medium comprises one or more compounds of the formula II.

6. Medium according to claim 2 , wherein the medium comprises one or more compounds of the formula III.

7. Medium according to claim 1 , wherein the medium comprises one or more dielectrically neutral compounds of the formula V

in which
R 51 and R 52 , 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 C atoms,

on each occurrence, independently of one another, denotes

Z 51 and Z 52 , independently of one another and, if Z 61 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— or a single bond, and
r denotes 0, 1 or 2.

8. Liquid-crystal display, wherein the liquid-crystal display comprises a medium of claim 1 .

9. Display according to claim 8 , wherein the display is addressed by an active matrix.

10. Process for the preparation of a medium according to claim 2 , wherein one or more compounds of the formula I, are mixed with one or more of the compounds of the formulae II and III, and optionally one or more further mesogenic compounds, and optionally one or more additives.

11. Medium according to claim 2 , wherein the medium comprises one or more compounds of formulae II.

12. Medium according to claim 2 , wherein the medium comprises one or more of formulae III.

13. Medium according to claim 1 , wherein the medium comprises:

Assignees

• Czanta Markus
• Hirschmann Harald
• Baran Sven
• Lietzau Lars
• Merck Patent Gmbh

Inventors

• Czanta Markus
• Hirschmann Harald
• Baran Sven
• Lietzau Lars

Classifications

• C09K19/20 Primary

  linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters {or ethers} · CPC title

• C09K19/3402

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

• C09K2019/0466

  the linking chain being a -CF2O- chain · CPC title

• C09K19/44

  containing compounds with benzene rings directly linked · CPC title

• C09K2019/3422

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