Liquid crystal composition and liquid crystal display device
View Patent ↗A liquid crystal composition having a nematic phase comprising two components, wherein the first component is at least one compound selected from the group of compounds represented by formula (1), and the second component is at least one compound selected from the group of compounds represented by formula (2), and the third component is at least one compound selected from the group of compounds represented by formula (3): wherein R 1 and R 2 are each independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring A and ring B are each independently 1,4-cyclohexylene, 1,4-phenylene; 2-fluoro-1,4-phenylene or 2,6-difluoro-1,4-phenylene; and X 1 , X 2 , X 3 and X 4 are each independently hydrogen or fluorine.
1. A liquid crystal composition having a nematic phase comprising three components, wherein the first component is at least one compound selected from the group of compounds represented by formula (1), and the second component is at least one compound selected from the group of compounds represented by formula (2), and the third component is at least one compound selected from the group of compounds represented by formula (3):
wherein R 1 and R 2 are each independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring A is 1,4-cyclohexylene; 1,4-phenylene; 2-fluoro-1,4-phenylene or 2,6-difluoro-1,4-phenylene; ring B is 1,4-phenylene; 2-fluoro-1,4-phenylene or 2,6-difluoro-1,4-phenylene and X 1 , X 2 , X 3 and X 4 are each independently hydrogen or fluorine.
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 formulas (1-1) to (1-2):
wherein R 3 is alkyl having 1 to 12 carbons, or alkenyl having 1 to 12 carbons; and X 1 , X 2 , X 3 , X 4 , X 5 and X 6 are each independently hydrogen or fluorine.
3. The liquid crystal composition according to claim 2 , wherein the first component is at least one compound selected from the group of compounds represented by formula (1-1).
4. The liquid crystal composition according to claim 1 , wherein a ratio of the first component is from approximately 5% by weight to approximately 40% by weight, and a ratio of the second component is from approximately 15% by weight to approximately 65% by weight, and a ratio of the third component is from approximately 5% by weight to approximately 40% by weight, based on the total weight of the liquid crystal composition.
5. 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 formula (4) as a fourth component:
wherein R 1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; X 1 and X 2 are each independently hydrogen or fluorine, ring C is independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 2,6-difluoro-1,4-phenylene; 1,3-dioxan-2,5-diyl, or pyrimidine-2,5-diyl; Z 1 is independently a single bond, ethylene or carbonyloxy, or difluoromethyleneoxy; Y 1 is fluorine or chlorine; and p is 1, 2 or 3.
6. The liquid crystal composition according to claim 5 , wherein the fourth component is at least one compound selected from the group of compounds represented by formulas (4-1) to (4-17):
wherein R 3 is alkyl having 1 to 12 carbons, alkenyl having 2 to 12 carbons; Y 1 is fluorine or chlorine.
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 (4-10).
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 (4-12).
9. 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 (4-13).
10. 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 (4-17).
11. The liquid crystal composition according to claim 6 , wherein the fourth component is a mixture of at least one compound selected from the group of compounds represented by formula (4-13) and at least one compound selected from the group of compounds represented by formula (4-17).
12. The liquid crystal composition according to claim 5 , wherein a ratio of the fourth component is from approximately 5% by weight to approximately 65% by weight based on the total weight of the liquid crystal composition.
13. The liquid crystal composition according to claim 1 , wherein the fifth component is at least one compound selected from the group of compounds represented by formulas (5-1) and (5-2):
wherein, R 1 and R 2 are each independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring D is 1,4-cyclohexylene or 1,4-phenylene; ring E and ring F are each independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene; and Z 2 is independently a single bond, ethylene or carbonyloxy ; and q is 1 or 2.
14. 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 formulas (5-1-1), (5-2-1) to (5-2-5):
wherein, R 1 and R 2 are each independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, alkenyl having 2 to 12 carbons or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine.
15. The liquid crystal composition according to claim 14 , wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-1-1).
16. The liquid crystal composition according to claim 14 , wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-2-1).
17. The liquid crystal composition according to claim 14 , wherein the fifth component is a mixture of at least one compound selected from the group of compounds represented by formula (5-1-1) and at least one compound selected from the group of compounds represented by formula (5-2-1).
18. The liquid crystal composition according to claim 13 , wherein a ratio of the fifth component is from approximately 3% by weight to approximately 40% by weight, based on the total weight of the liquid crystal composition.
19. The liquid crystal composition according to claim 1 , wherein the composition has a maximum temperature of a nematic phase of approximately 65° 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.
20. A liquid display device that includes the liquid crystal composition according to claim 1 .
21. The liquid crystal display device according to claim 20 , wherein the liquid crystal display device has an operation mode of a TN mode, an OCB mode an IPS mode or PSA mode and has a driving mode of an active matrix mode.