Liquid crystal composition and liquid crystal display device
View Patent ↗The liquid crystal composition having a negative dielectric anisotropy contains two ring compound having a large optical anisotropy and a negatively large dielectric anisotropy as the first component, three ring compound having a large maximum temperature and a large dielectric anisotropy as the second component, three ring compound having a large optical anisotropy and a large dielectric anisotropy as the third component, and two ring compound having a small viscosity as the fourth component. The liquid crystal display device contains the compositions.
1. A liquid crystal composition that has a negative dielectric anisotropy and contains at least one compound selected from the group of compounds represented by formula (1) as a first component, at least one compound selected from the group of compounds represented by formula (2) as a second component, at least one compound selected from the group of compounds represented by formula (3) as a third component and at least one compound selected from the group of compounds represented by formula (4-2) as a fourth component:
wherein R 1 , R 3 and R 5 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl containing only one double bond and having 2 to 12 carbons; R 2 , R 4 , and R 6 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons; R 7 is independently alkyl having 1 to 12 carbons or alkoxy having 1 to 12 carbons; ring A is 1,4-cycrohexylene, or 1,4-pnenylene; X 1 , X 2 , X 3 and X 4 are independently fluorine or chlorine; Y 1 is independently hydrogen or methyl; Z 1 is independently a single bond or ethylene.
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 (2-1) or formula (2-2):
wherein R 3 and R 4 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons.
3. The liquid crystal composition according to claim 1 , wherein the third component is at least one compound selected from the group of compounds represented by formula (3-1):
wherein R 5 and R 6 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons.
4. 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).
5. 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 (2-2).
6. The liquid crystal composition according to claim 1 , wherein a ratio of the first component is in the range of 10% by weight to 75% by weight, and a ratio of the second component is in the range of 10% by weight to 75% by weight, a ratio of the third component is in the range of 5% by weight to 70% by weight and a ratio of the fourth component is in the range of 10% by weight to 75% by weight based on the total weight of the liquid crystal composition.
7. The liquid crystal composition according to claim 1 , further containing at least one compound selected from the group of compounds represented by formula (5) as a fifth component:
wherein R 11 and R 12 are 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 hydrogen is replaced with fluorine; ring B, ring C or ring D are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4 phenylene, or 3-fluoro-1,4 phenylene; Z 2 and Z 3 are independently a single bond, ethylene, methyleneoxy or carbonyloxy; m is 0, 1 or 2 and at least one of ring C and ring D is 1,4-phenylene when m is 0.
8. The liquid crystal composition according to claim 7 , wherein the fifth component is at least one compound selected from the group of compounds represented by formula (5-1) to formula (5-12):
wherein R 11 and R 12 are 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 hydrogen is replaced with fluorine.
9. The liquid crystal composition according to claim 7 , wherein a ratio of the fifth component is in the range of 5% by weight to 40% by weight based on the total weight of the liquid crystal composition.
10. The liquid crystal composition according to claim 1 , further containing at least one compound selected from the group of compounds represented by formula (6-1) or formula (6-2) as a sixth component:
wherein R 13 and R 14 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons;
ring E and ring F are independently 1,4-cyclohexylene or 1,4-phenylene; Z 4 is independently a single bond, ethylene or methyleneoxy; Z 5 and Z 6 are independently a single bond, ethylene, methyleneoxy or carbonyloxy; X 5 and X 6 are independently fluorine or chlorine; p is 0, 1 or 2, q is 0 or 1, and the sum of p and q is 1 or 2.
11. The liquid crystal composition according to claim 10 , wherein the sixth component is at least one compound selected from the group of compounds represented by formula (6-1-1) to formula (6-1-3) and formula (6-2-1) to formula (6-2-5)
wherein R 13 and R 14 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons.
12. The liquid crystal composition according to claim 10 , wherein a ratio of the sixth component is in the range of 5% by weight to 40% by weight based on the total weight of the liquid crystal composition.
13. The liquid crystal composition according to claim 1 , wherein a maximum temperature of a nematic phase is 70° C. or higher, an optical anisotropy (25° C.) at a wavelength of 589 nanometers is 0.08 or more and a dielectric anisotropy (25° C.) at a frequency of 1 kHz is −2 or less.
14. A liquid crystal display device, containing the liquid crystal composition according to claim 1 .
15. The liquid crystal display device according to claim 14 , wherein an operating mode in the liquid crystal display device is a VA mode, an IPS mode, an FFS mode or a PSA mode, and a driving mode in the liquid crystal display device is an active matrix mode.
16. The liquid crystal composition according to claim 7 , further containing at least one compound selected from the group of compounds represented by formula (6-1) or formula (6-2) as a sixth component:
wherein R 13 and R 14 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons;
ring E and ring F are independently 1,4-cyclohexylene or 1,4-phenylene; Z 4 is independently a single bond, ethylene or methyleneoxy; Z 5 and Z 6 are independently a single bond, ethylene, methyleneoxy or carbonyloxy; X 5 and X 6 are independently fluorine or chlorine; p is 0, 1 or 2, q is 0 or 1, and the sum of p and q is 1 or 2.
17. The liquid crystal composition according to claim 16 , wherein the sixth component is at least one compound selected from the group of compounds represented by formula (6-1-1) to formula (6-1-3) and formula (6-2-1) to formula (6-2-5)
wherein R 13 and R 14 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons.