Liquid crystalline medium and liquid crystal display

Abstract

Disclosed are compounds of formula I

Description

EXAMPLES

The examples given in the following are illustrating the present invention without limiting it in any way.

However, the physical properties and compositions illustrate, which properties can be achieved and in which ranges they can be modified. Especially the combination of the various properties, which can be preferably achieved, is thus well defined.

Example 1

A liquid crystal mixture is realized with the composition and properties given in the following table.

Composition
Compound
No.	Abbreviation	Conc./%
1	SDUQU-3-F	7.50
2	CCZU-3-F	5.00
3	CDU-2-F	3.50
4	PUQU-2-F	9.50
5	PUQU-3-F	9.00
6	CC-3-V1	11.00
7	CC-3-V	35.00
8	CCP-V-1	9.50
9	CCP-V2-1	10.00
Σ		100.00
Physical Properties
	T (N, I) =	69.5° C.
	ne (20° C., 589.3 nm) =	1.5619
	Δn (20° C., 589.3 nm) =	0.0825
	ε|| (20° C., 1 kHz) =	10.6
	Δε (20° C., 1 kHz) =	7.3
	γ1 (20° C.) =	53 mPa · s
	k1 (20° C.) =	11.6 pN
	k3/k1 (20° C.) =	1.16
	V0 (20° C.) =	1.32 V

This mixture has a favorably low value of Δn, a moderately high value of Δε and a very low rotational viscosity. Thus, it is very well suited for displays operating in the IPS mode.

Example 2

A liquid crystal mixture is realized with the composition and properties given in the following table.

Composition
Compound
No.	Abbreviation	Conc./%
1	SDUQU-3-F	7.00
2	CCP-3OCF3	6.00
3	PGU-2-F	9.00
4	PUQU-2-F	8.00
5	PUQU-3-F	9.50
6	CC-3-V1	13.00
7	CC-4-V	14.00
8	CC-5-V	9.00
9	CCP-V-1	11.50
10	CCP-V2-1	10.00
11	PCH-302	3.00
Σ		100.00
Physical Properties
	T (N, I) =	74.0° C.
	ne (20° C., 589.3 nm) =	1.5835
	Δn (20° C., 589.3 nm) =	0.0981
	ε|| (20° C., 1 kHz) =	11.6
	Δε (20° C., 1 kHz) =	8.1
	γ1 (20° C.) =	68 mPa · s
	k1 (20° C.) =	12.2 pN
	k3/k1 (20° C.) =	0.97
	V0 (20° C.) =	1.31 V

This mixture has a rather low value of Δn, a rather high value of Δε and a low rotational viscosity. Thus, it is very well suited for displays operating in the IPS mode.

The entire disclosures of all applications, patents and publications, cited herein and of corresponding European application No. 06007391.3, filed Apr. 7, 2006, are incorporated by reference herein.

The preceding examples can be repeated with similar success by substituting the generically or specifically described reactants and/or operating conditions of this invention for those used in the preceding examples.

From the foregoing description, one skilled in the art can easily ascertain the essential characteristics of this invention and, without departing from the spirit and scope thereof, can make various changes and modifications of the invention to adapt it to various usages and conditions.

Claims

1. A liquid crystal medium comprising a first dielectrically positive component, component A, which comprises one or more dielectrically positive compounds of formula I

2. A ligand crystal medium according to claim 1, wherein component B comprises one or more compounds of formulae II or III

3. A liquid crystal medium according to claim 1, wherein the concentration of component A in the medium is 5% to 60% by weight.

4. A liquid crystal medium according to claim 1, wherein component A comprises one or more compounds of formula I′

5. A liquid crystal medium according to claim 1, wherein component A comprises one or more compounds of formulae I-1, I-2, I-3, I-4, I-5, I-6, I-7, I-8 or I-9

6. A liquid crystal medium according to claim 2, which comprises one or more compounds of formula II.

7. A liquid crystal medium according to claim 2, which comprises one or more compounds of formula III.

8. A liquid crystal medium according to claim 1, which comprises one or more dielectrically neutral compounds of formula IV.

9. A liquid crystal medium according to claim 1, further comprising a componet D, which comprises one or more compounds of formula V

10. A liquid crystal display, comprising a liquid crystal medium according to claim 1.

11. A liquid crystal display according to claim 9, which is addressed by an active matrix.

12. A compound of formula I

13. A liquid crystal medium according to claim 1, wherein

14. A compound of claim 12, wherein

15. A liquid crystal medium according to claim 1, wherein component A comprises one or more compounds of formulae I-1, I-2, I-3, I-4, I-5, I-6, I-7, I-8 or I-9

16. A liquid crystal medium according to claim 1, wherein X1 is F, Cl, —OCF3 or —CF3.

17. A liquid crystal medium according to claim 1, wherein R41 is alkyl and R42 is alkoxy.