Liquid crystal composition and liquid crystal display device

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 and at least one compound selected from the group of compounds represented by formula (2) as a second component:

wherein R 1 , R 2 , 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; ring A is:

X 1 , X 2 , X 3 and X 4 are independently fluorine or chlorine; Z 1 is a single bond, ethylene or methyleneoxy; and, in formula (2), at least one of two ring A is:

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):

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.

3. 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) to formula (2-7):

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.

4. The liquid crystal composition according to claim 3 , 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 a ratio of the first component is in the range of 5% by weight to 50% by weight, and a ratio of the second component is in the range of 10% by weight to 95% by weight, based on the total weight of the liquid crystal composition.

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

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, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine; ring B, ring C and 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; and n is 0, 1 or 2.

7. The liquid crystal composition according to claim 6 , wherein the third component is at least one compound selected from the group of compounds represented by formula (3-1) to formula (3-13):

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, or alkenyl having 2 to 12 carbons in which arbitrary hydrogen is replaced by fluorine.

8. The liquid crystal composition according to claim 6 , wherein a ratio of the third component is in the range of 10% by weight to 85% by weight based on the total weight of the liquid crystal composition.

9. The liquid crystal composition according to claim 1 , further containing at least one compound selected from the group of compounds represented by formula (4) as a fourth component:

wherein R 7 and R 8 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 and Z 5 are independently a single bond, ethylene or carbonyloxy; X 5 and X 6 are independently fluorine or chlorine; Y 1 is hydrogen or methyl; p is 1 or 2 and q is 0 or 1; and ring E when p is 1 and q is 0 is 1,4-cyclohexylene.

10. The liquid crystal composition according to claim 9 , wherein the fourth component is at least one compound selected from the group of compounds represented by formula (4-1) to formula (4-7):

wherein R 7 and R 8 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons.

11. The liquid crystal composition according to claim 9 , wherein a ratio of the fourth component is in the range of 5% by weight to 40% by weight based on the total weight of the liquid crystal composition.

12. 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 9 and R 10 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons; ring G and ring I are independently 1,4-cyclohexylene or 1,4-phenylene; Z 6 and Z 7 are independently a single bond, ethylene, methyleneoxy or carbonyloxy; r is 0, 1 or 2, s is 0 or 1, and a sum of r and s is 1 or 2.

13. 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 (5-1) to formula (5-5):

wherein R 9 and R 10 are independently alkyl having 1 to 12 carbons, alkoxy having 1 to 12 carbons or alkenyl having 2 to 12 carbons.

14. The liquid crystal composition according to claim 12 , wherein a ratio of the fifth component is in the range of 5% by weight to 30% by weight based on the total weight of a liquid crystal composition.

15. 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.

16. A liquid crystal display device, including the liquid crystal composition according to claim 1 .

17. The liquid crystal display device according to claim 16 , wherein an operating mode in the liquid crystal display device is a VA mode, an IPS mode, a FFS mode or a PSA mode, and a driving mode in the liquid crystal display device is an active matrix mode.