Liquid crystal composition and liquid crystal display device

• US 20080246001A1
• Filed: 03/31/2008
• Published: 10/09/2008
• Est. Priority Date: 04/04/2007
• Status: Active Grant

• Current Assignee: JNC Petrochemical Corporation (Chisso Corporation)
• Original Assignee: Chisso Corporation, Chisso Petrochemical Corporation
• Inventors: Hiroaki, Fujita
• Granted Patent: US 7,597,944 B2
• Time in Patent Office: Days
• US Class Current: 252/299.61
• CPC Class Codes: C09K 19/20 linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters or ethers
• CPC Class Codes: C09K 19/3458 Uncondensed pyrimidines
• CPC Class Codes: C09K 19/44 containing compounds with benzene rings directly linked
• CPC Class Codes: C09K 2019/0444 characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group
• CPC Class Codes: C09K 2019/0451 the end chain group being a CH3CH=CHCH2CH2- chain
• CPC Class Codes: C09K 2019/0466 the linking chain being a -CF2O- chain
• CPC Class Codes: C09K 2019/123 Ph-Ph-Ph
• CPC Class Codes: C09K 2019/3004 Cy-Cy
• CPC Class Codes: C09K 2019/3016 Cy-Ph-Ph
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition

Abstract

The invention relates to a liquid crystal composition that satisfies at least one characteristic among the characteristics such as a high maximum temperature of a nematic phase, a low minimum temperature of a nematic phase, a small viscosity or a small rotation viscosity, a large optical anisotropy, a large dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light, a high stability to heat and so forth, and provide an AM device that has a short response time, a large voltage holding ratio, a large contrast ratio, a long service life and so forth.

Claims

1. A liquid crystal composition having a nematic phase comprising a first component that is at least one compound selected from the group of compounds represented by formula (1-1) and formula (1-2), a second component that is at least one compound selected from the group of compounds represented by formula (2-1) and (2-2), and a third compounds represented by formula (3):

2. The liquid crystal composition according to claim 1, wherein the second component is at least one compound selected from the group of compounds represented by formula from (2-1-1) to (2-1-5) and from (2-2-1) to (2-2-4).

3. The liquid crystal composition according to claim 2, wherein the second component is at least one compound selected from the group of compounds represented by formula (2-1-1) and (2-1-3).

4. The liquid crystal composition according to claim 1, wherein the liquid crystal composition has a ratio of the first component from approximately 5% by weight to approximately 40% by weight, a ratio of the second component from approximately 5% by weight to approximately 30% by weight, and a ratio of the third component from approximately 25% by weight to approximately 70% by weight based on the total weight of the liquid crystal composition.

5. The liquid crystal composition according to claim 1, further comprising at least one compound selected from the group of compounds represented by formulas (4-1) and (4-2) as a fourth component:

6. The liquid crystal composition according to claim 5, further comprising at least one compound selected from the group of compounds represented by formulas from (4-1-1) to (4-1-5) and from (4-2-1) to (4-2-3) as a fourth component:

7. The liquid crystal composition according to claim 6, wherein the fourth component is at least one compound selected from the group of compounds represented by formula (4-1-2).

8. The liquid crystal composition according to claim 6, wherein the fourth component is at least one compound selected from the group of compounds represented by formula (4-1-5).

9. The liquid crystal composition according to claim 5, wherein the liquid crystal composition has a ratio of the first component from approximately 5% by weight to approximately 40% by weight, a ratio of the second component from approximately 5% by weight to approximately 30% by weight, a ratio of the third component from approximately 25% by weight to approximately 70%, and a ratio of the fourth component from approximately 5% by weight to approximately 40% by weight based on the total weight of the liquid crystal composition.

10. The liquid crystal composition according to claim 1, further comprising at least one compound selected from the group of compounds represented by formulas (5) as a fifth component:

11. The liquid crystal composition according to claim 5, further comprising at least one compound selected from the group of compounds represented by formulas (5) as a fifth component:

12. The liquid crystal composition according to claim 10, wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-1) to (5-9).

13. The liquid crystal composition according to claim 11, wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-1) to (5-9).

14. The liquid crystal composition according to claim 12, wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-2) and (5-3).

15. The liquid crystal composition according to claim 13, wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-2) and (5-3).

16. The liquid crystal composition according to claim 12, wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-6).

17. The liquid crystal composition according to claim 13, wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-6).

18. The liquid crystal composition according to claim 12, wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-9).

19. The liquid crystal composition according to claim 13, wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-9).

20. The liquid crystal composition according to claim 10, wherein the liquid crystal composition has a ratio of the first component from approximately 5% by weight to approximately 40% by weight, a ratio of the second component from approximately 5% by weight to approximately 30% by weight, a ratio of the third component from approximately 25% by weight to approximately 70% by weight, and a ratio of the fifth component from approximately 5% by weight to approximately 30% by weight based on the total weight of the liquid crystal composition.

21. The liquid crystal composition according to claim 11, wherein the liquid crystal composition has a ratio of the first component from approximately 5% by weight to approximately 40% by weight, a ratio of the second component from approximately 5% by weight to approximately 30% by weight, a ratio of the third component from approximately 25% by weight to approximately 70% by weight, a ratio of the fourth component from approximately 5% by weight to approximately 40% by weight, and a ratio of the fifth component from approximately 5% by weight to approximately 30% by weight based on the total weight of the liquid crystal composition.

22. The liquid crystal composition according to claim 1, wherein the liquid crystal composition has a maximum temperature of a nematic phase of approximately 70°

C. or more, an optical anisotropy (25°

C.) at a wavelength of 589 nm of approximately 0.08 or more, and a dielectric anisotropy (25°

C.) at a frequency of 1 kHz of approximately 2 or more.

23. A liquid crystal display device comprising the liquid crystal composition according to claim 1.

24. The liquid crystal display device according to claim 23, wherein the liquid crystal display device has an operation mode of TN mode, OCB mode or IPS mode, and has a driving mode of an active matrix mode.