Compound, liquid crystal composition and liquid crystal display device
View Patent ↗A liquid crystal composition is described, which has a nematic phase and contains a compound having a high maximum temperature and a large dielectric anisotropy as a first component, and a specific compound having a large dielectric anisotropy as a second component, and may also contain a specific compound having a large dielectric anisotropy as a third component, and a compound having a small viscosity as a fourth component. An AM liquid crystal display device including the composition is also described.
1. A liquid crystal composition that has a nematic phase and contains at least one compound selected from the group of compounds represented by formula (1) as a first component and at least one compound selected from the group of compounds represented by formula (2) as a second component, in which a proportion of the first component is in a range of 25 wt % to 85 wt % based on a total weight of the liquid crystal composition:
wherein R 1 and R 2 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons; ring A, ring B and ring C are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, 2,6,7-trioxabicyclo[2.2.2]octane-1,4-diyl or tetrahydropyran-2,5-diyl; X 1 and X 2 are independently hydrogen or fluorine; Y 1 and Y 2 are independently fluorine, chlorine, trifluoromethyl or trifluoromethoxy; Z 1 , Z 2 , Z 3 and Z 4 are independently a single bond, ethylene, carbonyloxy or difluoromethyleneoxy; m and n are 0, 1, 2 or 3, and a sum of m and n is 2 or 3; and p is 1, 2, 3 or 4.
2. The liquid crystal composition of claim 1 , wherein the proportion of the first component is in a range of 25 wt % to 80 wt % based on the total weight of the liquid crystal composition.
3. The liquid crystal composition of claim 1 , wherein the first component is at least one compound selected from the group of compounds represented by formula (1-1) to formula (1-5):
wherein R 1 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons; X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 and X 8 are independently hydrogen or fluorine; and Y 1 is fluorine, chlorine, trifluoromethyl or trifluoromethoxy.
4. The liquid crystal composition of claim 3 , wherein the first component is at least one compound selected from the group of compounds represented by formula (1-2).
5. The liquid crystal composition of claim 3 , wherein the first component is at least one compound selected from the group of compounds represented by formula (1-3).
6. The liquid crystal composition of claim 1 , wherein the second component is at least one compound selected from the group of compounds represented by formula (2-1) to formula (2-20):
wherein R 2 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons; X 9 , X 10 , X 11 , X 12 , X 13 , X 14 , X 15 and X 16 are independently hydrogen or fluorine; and Y 3 is fluorine, chlorine, trifluoromethyl, or trifluoromethoxy.
7. The liquid crystal composition of claim 6 , wherein the second component is at least one compound selected from the group of compounds represented by formula (2-18).
8. The liquid crystal composition of claim 6 , wherein the second component is at least one compound selected from the group of compounds represented by formula (2-19).
9. The liquid crystal composition of claim 2 , wherein the proportion of the first component is in the range of 25 wt % to 80 wt %, and a proportion of the second component is in a range of 20 wt % to 75 wt %, based on the total weight of the liquid crystal composition.
10. The liquid crystal composition of claim 2 , wherein the proportion of the first component is in a range of 30 wt % to 75 wt %, and a proportion of the second component is in a range of 25 wt % to 70 wt %, based on the total weight of the liquid crystal composition.
11. The liquid crystal composition of claim 1 , further containing at least one compound selected from the group of compounds represented by formula (3) as a third component:
wherein R 3 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons; ring D and ring E are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene, pyrimidine-2,5-diyl, 2,6,7-trioxabicyclo[2.2.2]octane-1,4-diyl or tetrahydropyran-2,5-diyl; X 17 and X 18 are independently hydrogen or fluorine; Y 4 is fluorine, chlorine, trifluoromethyl or trifluoromethoxy; Z 5 , Z 6 and Z 7 are independently a single bond, ethylene, carbonyloxy or difluoromethyleneoxy; and q and r are 0, 1, 2 or 3, and a sum of q and r is 1, 2 or 3.
12. The liquid crystal composition of claim 11 , wherein the third component is at least one compound selected from the group of compounds represented by formula (3-1) to formula (3-3):
wherein R 3 is alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons, or alkenyl having 2 to 12 carbons; X 19 , X 20 , X 21 , X 22 , X 23 , X 24 and X 25 are independently hydrogen or fluorine; and Y 4 is fluorine, chlorine, trifluoromethyl or trifluoromethoxy.
13. The liquid crystal composition of claim 11 , wherein a proportion of the third component is in a range of 10 wt % to 50 wt % based on the total weight of the liquid crystal composition.
14. The liquid crystal composition of claim 1 , further containing at least one compound selected from the group of compounds represented by formula (4) as a fourth component:
wherein R 4 and R 5 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 arbitrary hydrogen is replaced by fluorine; ring F, ring G and ring I are independently 1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene or 3-fluoro-1,4-phenylene; Z 8 and Z 9 are independently a single bond, ethylene, methyleneoxy or carbonyloxy; and s is 0, 1 or 2.
15. The liquid crystal composition of claim 14 , wherein the fourth component is at least one compound selected from the group of compounds represented by formula (4-1) to formula (4-13):
wherein R 4 and R 5 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 arbitrary hydrogen is replaced by fluorine.
16. The liquid crystal composition of claim 14 , wherein a proportion of the fourth component is in a range of 3 wt % to 35 wt % based on the total weight of the liquid crystal composition.
17. The liquid crystal composition of claim 1 , of which a maximum temperature of 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 more.
18. A liquid crystal display device including the liquid crystal composition of claim 1 .
19. The liquid crystal display device of claim 18 , of which an operating mode is a TN mode, an OCB mode, an IPS mode, an FFS mode, a PSA mode or an FPA mode, and a driving mode is an active matrix mode.