Optical film
Optical film having a first phase difference layer and a second phase difference layer, wherein the second phase difference layer having an optical property represented by the formula (3), and the optical film has optical properties represented by the formula (1) and the formula (2). Re(450)/Re(550)≦1.00(1)1.00≦Re(650)/Re(550)(2)nx≈ny<nz(3), wherein, Re(450) represents the in-plane phase difference value at a wavelength of 450 nm, Re(550) represents the in-plane phase difference value at a wavelength of 550 nm, and Re(650) represents the in-plane phase difference value at a wavelength of 650 nm, nx represents the principal refractive index in a direction parallel to the film plane, ny represents the refractive index in a direction parallel to the film plane and orthogonally-crossing the direction of nx, nz represents the refractive index in a direction vertical to the film plane, in an index ellipsoid formed by the phase difference layer.
1. An optical film having a first phase difference layer and a second phase difference layer, wherein the second phase difference layer has an optical property represented by the formula (3) and the optical film has optical properties represented by the formula (1) and the formula (2):
Re (450)/ Re (550)≦1.00 (1)
1.00 ≦Re (650)/ Re (550) (2)
nx≈ny<nz (3)
wherein, Re(450) represents the in-plane phase difference value at a wavelength of 450 nm, Re(550) represents the in-plane phase difference value at a wavelength of 550 nm, and Re(650) represents the in-plane phase difference value at a wavelength of 650 nm, nx represents the principal refractive index in a direction parallel to the film plane in an index ellipsoid formed by the phase difference layer, ny represents the refractive index in a direction parallel to the film plane and orthogonally-crossing the direction of nx in an index ellipsoid formed by the phase difference layer, and nz represents the refractive index in a direction vertical to the film plane in an index ellipsoid formed by the phase difference layer.
2. The optical film according to claim 1 , wherein the first phase difference layer has an optical property represented by the formula (4):
100 <Re (550)<160 (4)
wherein, Re(550) represents the same meaning as described above.
3. The optical film according to claim 1 , wherein the first phase difference layer has optical properties represented by the formula (1) and the formula (2):
Re (450)/ Re (550)≦1.00 (1)
1.00 ≦Re (650)/ Re (550) (2)
(wherein, Re(450), Re(550) and Re(650) represent the same meaning as described above.).
4. The optical film according to claim 1 , wherein the first phase difference layer has a layer A having optical properties represented by the formulae (4), (6) and (7) and a layer B having optical properties represented by the formulae (5), (6) and (7):
100 <Re (550)<160 (4)
200 <Re (550)<320 (5)
Re (450)/ Re (550)≧1.00 (6)
1.00 ≧Re (650)/ Re (550) (7)
wherein, Re(450), Re(550) and Re(650) represent the same meaning as described above.
5. The optical film according to claim 4 , wherein the layer A is a coating layer formed by polymerizing at least one polymerizable liquid crystal.
6. The optical film according to claim 4 , wherein the layer B is a coating layer formed by polymerizing at least one polymerizable liquid crystal.
7. The optical film according to claim 4 , wherein the layer A has a thickness of 5 μm or less.
8. The optical film according to claim 4 , wherein the layer B has a thickness of 5 μm or less.
9. The optical film according to claim 4 , wherein each of the layer A and the layer B has a thickness of 5 μm or less.
10. The optical film according to claim 4 , wherein the layer A is formed via or not via an orientation film on a base material, the layer B is formed via or not via an orientation film on the layer A, and the second phase difference layer is formed via or not via an orientation film on the layer B.
11. The optical film according to claim 10 , having a protective layer between the layer A and the layer B.
12. The optical film according to claim 4 , wherein the layer B is formed via or not via an orientation film on a base material, the layer A is formed via or not via an orientation film on the layer B, and the second phase difference layer is formed via or not via an orientation film on the layer A.
13. The optical film according to claim 4 , wherein the second phase difference layer is formed via or not via an orientation film on a base material, the layer A is formed via or not via an orientation film on the second phase difference layer, and the layer B is formed via or not via an orientation film on the layer A.
14. The optical film according to claim 4 , wherein the second phase difference layer is formed via or not via an orientation film on a base material, the layer B is formed via or not via an orientation film on the second phase difference layer, and the layer A is formed via or not via an orientation film on the layer B.
15. The optical film according to claim 4 , wherein the layer A is formed via or not via an orientation film on one surface of a base material, the layer B is formed via or not via an orientation film on the layer A, and the second phase difference layer is formed via or not via an orientation film on the other surface of a base material.
16. The optical film according to claim 4 , wherein the layer B is formed via or not via an orientation film on one surface of a base material, the layer A is formed via or not via an orientation film on the layer B, and the second phase difference layer is formed via or not via an orientation film on the other surface of a base material.
17. The optical film according to claim 1 further having a third phase difference layer, wherein the third phase difference layer has an optical property represented by the formula (5):
200 <Re (550)<320 (5)
wherein, Re(550) represents the same meaning as described above.
18. The optical film according to claim 17 , wherein the first phase difference layer and the third phase difference layer have optical properties represented by the formula (6) and the formula (7):
Re (450)/ Re (550)≧1.00 (6)
1.00 ≧Re (650)/ Re (550) (7)
wherein Re(450), Re(550) and Re(650) represent the same meaning as described above.
19. The optical film according to claim 17 , wherein the third phase difference layer is a coating layer formed by polymerizing at least one polymerizable liquid crystal.
20. The optical film according to claim 17 , wherein the third phase difference layer has a thickness of 5 μm or less.
21. The optical film according to claim 17 , wherein the third phase difference layer is formed on an orientation film.
22. The optical film according to claim 21 , wherein the orientation film is an orientation film having an orientation regulation force generated by photoirradiation.
23. The optical film according to claim 21 , wherein the orientation film is an orientation film generating a vertical orientation regulation force.
24. The optical film according to claim 17 , wherein the first phase difference layer is formed via or not via an orientation film on a base material, the second phase difference layer is formed via or not via an orientation film on the first phase difference layer, and the third phase difference layer is formed via or not via an orientation film on the second phase difference layer.
25. The optical film according to claim 17 , wherein the third phase difference layer is formed via or not via an orientation film on a base material, the second phase difference layer is formed via or not via an orientation film on the third phase difference layer, and the first phase difference layer is formed via or not via an orientation film on the second phase difference layer.
26. The optical film according to claim 17 , wherein the first phase difference layer is formed via or not via an orientation film on one surface of a base material, the second phase difference layer is formed via or not via an orientation film on the first phase difference layer, and the third phase difference layer is formed via or not via an orientation film on the other surface of a base material.
27. The optical film according to claim 17 , wherein the second phase difference layer is formed via or not via an orientation film on one surface of a base material, the first phase difference layer is formed via or not via an orientation film on the second phase difference layer, and the third phase difference layer is formed via or not via an orientation film on the other surface of a base material.
28. The optical film according to claim 17 , wherein the third phase difference layer is formed via or not via an orientation film on one surface of a base material, the second phase difference layer is formed via or not via an orientation film on the third phase difference layer, and the first phase difference layer is formed via or not via an orientation film on the other surface of a base material.
29. The optical film according to claim 17 , wherein the second phase difference layer is formed via or not via an orientation film on one surface of a base material, the third phase difference layer is formed via or not via an orientation film on the second phase difference layer, and the first phase difference layer is formed via or not via an orientation film on the other surface of a base material.
30. The optical film according to claim 1 , wherein the first phase difference layer is a coating layer formed by polymerizing at least one polymerizable liquid crystal.
31. The optical film according to claim 1 , wherein the second phase difference layer is a coating layer formed by polymerizing at least one polymerizable liquid crystal.
32. The optical film according to claim 1 , wherein the first phase difference layer has a thickness of 5 μm or less.
33. The optical film according to claim 1 , wherein the second phase difference layer has a thickness of 5 μm or less.
34. The optical film according to claim 1 , wherein each of the first phase difference layer and the second phase difference layer has a thickness of 5 μm or less.
35. The optical film according to claim 1 , wherein the first phase difference layer is formed on an orientation film.
36. The optical film according to claim 35 , wherein the orientation film has a thickness of 500 nm or less.
37. The optical film according to claim 1 , wherein the second phase difference layer is formed on an orientation film.
38. The optical film according to claim 1 , wherein the first phase difference layer is formed via or not via an orientation film on a base material, and the second phase difference layer is formed via or not via an orientation film on the first phase difference layer.
39. The optical film according to claim 38 , having a protective layer between the first phase difference layer and the second phase difference layer.
40. The optical film according to claim 1 , wherein the second phase difference layer is formed via or not via an orientation film on a base material, and the first phase difference layer is formed via or not via an orientation film on the second phase difference layer.
41. The optical film according to claim 1 , having the first phase difference layer, the second phase difference layer and the third phase difference layer in this order.
42. The optical film according to claim 41 , having a protective layer between the second phase difference layer and the third phase difference layer.
43. The optical film according to claim 1 , wherein the first phase difference layer is formed via or not via an orientation film on one surface of a base material, and the second phase difference layer is formed via or not via an orientation film on the other surface of a base material.
44. A circular polarization plate having the optical film according to claim 1 and a polarization plate.
45. The circular polarization plate according to claim 44 , wherein the optical film and the polarization plate are pasted together with an active energy ray curable adhesive or an aqueous adhesive.
46. An organic EL display having the circular polarization plate according to claim 44 .
47. A touch panel display having the circular polarization plate according to claim 44 .