LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL DISPLAY DEVICE

• US 20080303001A1
• Filed: 03/17/2008
• Published: 12/11/2008
• Est. Priority Date: 03/22/2007
• Status: Active Grant

• Current Assignee: JNC Petrochemical Corporation (Chisso Corporation)
• Original Assignee: Chisso Corporation, Chisso Petrochemical Corporation
• Inventors: SAITO, MASAYUKI, KIBE, SHIGERU, HATTORI, NORIKATSU
• Granted Patent: US 7,767,279 B2
• Time in Patent Office: Days
• US Class Current: 252/299.61
• CPC Class Codes: C09K 19/3402 having oxygen as hetero atom sugars C09K19/0422
• CPC Class Codes: C09K 19/42 Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
• CPC Class Codes: C09K 19/44 containing compounds with benzene rings directly linked
• CPC Class Codes: C09K 2019/0407 containing a carbocyclic ring, e.g. dicyano-benzene, chlorofluoro-benzene or cyclohexanone
• CPC Class Codes: C09K 2019/123 Ph-Ph-Ph
• CPC Class Codes: C09K 2019/3025 Cy-Ph-Ph-Ph
• CPC Class Codes: C09K 2019/3422 the heterocyclic ring being a six-membered ring
• CPC Class Codes: C09K 2019/3425 Six-membered ring with oxygen(s) in fused, bridged or spiro ring systems
• 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 is to provide 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, a large optical anisotropy, a negatively large dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light, a high stability to heat and so forth. A liquid crystal composition having a negative dielectric anisotropy comprising two components, wherein the first component is at least one compound selected from the group of compounds represented by formula (1-1) and formula (1-2), and the second component is at least one compound selected from the group of compounds represented by formula (2-1) and formula (2-2):

wherein R¹ and R² are each independently alkyl having 1 to 12 carbons, alkoxy having from 1 to 12 carbons, alkenyl having 2 to 12 carbons or alkenyl having 2 to 12 carbons, arbitrary hydrogen of which is replaced by fluorine; Z¹ is a single bond, ethylene, methyleneoxy or carbonyloxy; ring A and ring B are each independently tetrahydropyran-2,5-diyl, 1,4-cyclohexylene, or 1,4-phenylene, at least one of ring A and ring B is tetrahydropyran-2,5-diyl.

Claims

1. A liquid crystal composition having a negative dielectric anisotropy comprising two components, wherein the first component is at least one compound selected from the group of compounds represented by formula (1-1) and (1-2), and the second component is at least one compound selected from the group of compounds represented by formula (2-1) and (2-2):

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

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

4. 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 (2-2).

5. The liquid crystal composition according to claim 1, wherein the first component is at least one compound selected from the group of compounds represented by formulas (1-1-1), (1-2-1), (1-2-2), (1-2-3), and (1-2-4).

6. The liquid crystal composition according to claim 1, wherein a ratio of the first component is from approximately 30% by weight to approximately 80% by weight, and a ratio of the second component is from approximately 20% by weight to approximately 70% by weight, based on the total weight of the liquid crystal composition.

7. The liquid crystal composition according to claim 1, wherein the composition further comprises at least one compound selected from the group of compounds represented by formulas (3) as a third component:

8. The liquid crystal composition according to claim 7, wherein the third component is at least one compound selected from the group of compounds represented by formula (3-1) to (3-7).

9. The liquid crystal composition according to claim 8, wherein the third component is at least one compound selected from the group of compounds represented by formulas (3-1), (3-4), and (3-7).

10. The liquid crystal composition according to claim 8, wherein the third component is at least one compound selected from the group of compounds represented by formulas (3-1) and (3-4).

11. The liquid crystal composition according to claim 8, wherein the third component is at least one compound selected from the group of compounds represented by formula (3-1).

12. The liquid crystal composition according to claim 7, wherein a ratio of the first component is from approximately 30% by weight to approximately 75% by weight, a ratio of the second component is from approximately 20% by weight to approximately 65% by weight, a ratio of the third component is from approximately 5% by weight to approximately 50% by weight based on the total weight of the liquid crystal composition.

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

14. The liquid crystal composition according to claim 13, wherein the fourth component is at least one compound selected from the group of compounds represented by formulas (4-1) to (4-8), and formulas (5-1) to (5-2).

15. The liquid crystal composition according to claim 14, wherein the fourth component is at least one compound selected from the group of compounds represented by formula (4-2) and (4-8).

16. The liquid crystal composition according to claim 13, wherein a ratio of the first component is from approximately 30% by weight to approximately 75% by weight, a ratio of the second component is from approximately 20% by weight to approximately 65% by weight, and a ratio of the fourth component is from approximately 5% by weight to approximately 50% by weight, based on the total weight of the liquid crystal composition.

17. The liquid crystal composition according to claim 13, wherein a ratio of the first component is from approximately 30% by weight to approximately 70% by weight, a ratio of the second component is from approximately 20% by weight to approximately 60% by weight, and a ratio of the third component is from approximately 5% by weight to approximately 45% by weight, and a ratio of the fourth component is from approximately 5% by weight to approximately 45% by weight, based on the total weight of the liquid crystal composition.

18. The liquid crystal composition according to claim 13, wherein the 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 0.07 or more, and a dielectric anisotropy (25°

C.) at a frequency of 1 kHz of approximately −

2.0 or less.

19. A liquid crystal display device that includes the liquid crystal composition according to claim 1.

20. The liquid crystal display device according to claim 19, wherein the liquid crystal display device has an operation mode of a VA mode or an IPS mode, and has a driving mode of an active matrix mode.