Circular polarizing plate having patterned retardation layer and organic EL display element having said circular polarizing plate
An image display device in which an image display panel, at least one patterned retardation layer and a polarization element layer are arranged in this order, and the patterned retardation layer includes first retardation regions and second retardation regions which are alternately arranged in a stripe-like form and in which at least one of an in-plane slow axis direction and a retardation is different from each other.
1. An image display device in which an image display panel, at least one patterned retardation layer and a polarization element layer are arranged in this order, and the patterned retardation layer comprises first retardation regions and second retardation regions which are alternately arranged in a stripe-like form and in which at least one of an in-plane slow axis direction and a retardation is different from each other,
wherein a total Rth of entire layers provided at a side of the polarization element layer, in which the patterned retardation layer is provided, in the first retardation region and the second retardation region of the patterned retardation layer satisfies the following formula (II):
−90 nm≦ R th(550)≦90 nm (II)
wherein Rth(λ) represents a retardation (nm) in a thickness direction at a wavelength of λ nm.
2. The image display device as claimed in claim 1 , wherein at least one of the first retardation region and the second retardation region of the patterned retardation layer has an in-plane retardation of λ/4.
3. The image display device as claimed in claim 1 , wherein the first retardation region and the second retardation region of the patterned retardation layer satisfy the following formula (I):
Re (450)> Re (550)> Re (630) (I)
wherein Re(λ) represents an in-plane retardation (nm) at a wavelength of λ nm.
4. The image display device as claimed in claim 2 , wherein the first retardation region and the second retardation region of the patterned retardation layer satisfy the following formula (I):
Re (450)> Re (550)> Re (630) (I)
wherein Re(λ) represents an in-plane retardation (nm) at a wavelength of λ nm.
5. The image display device as claimed in claim 1 , wherein the patterned retardation layer comprises an optically anisotropic layer containing at least an oriented film and a liquid crystal compound.
6. The image display device as claimed in claim 2 , wherein the patterned retardation layer comprises an optically anisotropic layer containing at least an oriented film and a liquid crystal compound.
7. The image display device as claimed in claim 3 , wherein the patterned retardation layer comprises an optically anisotropic layer containing at least an oriented film and a liquid crystal compound.
8. The image display device as claimed in claim 4 , wherein the patterned retardation layer comprises an optically anisotropic layer containing at least an oriented film and a liquid crystal compound.
9. The image display device as claimed in claim 5 , wherein the liquid crystal compound contained in the optically anisotropic layer is a discotic liquid crystal compound, and the discotic liquid crystal compound is oriented approximately vertically.
10. The image display device as claimed in claim 6 , wherein the liquid crystal compound contained in the optically anisotropic layer is a discotic liquid crystal compound, and the discotic liquid crystal compound is oriented approximately vertically.
11. The image display device as claimed in claim 7 , wherein the liquid crystal compound contained in the optically anisotropic layer is a discotic liquid crystal compound, and the discotic liquid crystal compound is oriented approximately vertically.
12. The image display device as claimed in claim 8 , wherein the liquid crystal compound contained in the optically anisotropic layer is a discotic liquid crystal compound, and the discotic liquid crystal compound is oriented approximately vertically.
13. The image display device as claimed in claim 1 , wherein the liquid crystal compound contained in the optically anisotropic layer is a discotic liquid crystal compound, and the discotic liquid crystal compound is oriented approximately vertically.
14. The image display device as claimed in claim 2 , wherein the liquid crystal compound contained in the optically anisotropic layer is a discotic liquid crystal compound, and the discotic liquid crystal compound is oriented approximately vertically.
15. The image display device as claimed in claim 3 , wherein the liquid crystal compound contained in the optically anisotropic layer is a discotic liquid crystal compound, and the discotic liquid crystal compound is oriented approximately vertically.
16. The image display device as claimed in claim 1 , wherein the image display panel is an organic EL element.