Organic EL display
View Patent ↗An organic EL display includes an insulating layer with light-transmission property, an organic EL element located on a back side of the insulating layer, a diffraction grating located on the back side of the insulating layer, and an optical film disposed on a front side of the insulating layer and including optically isotropic first portions and optically anisotropic second portions, the first and second portions forming boundaries inclined with respect to a main surface of the optical film.
1. An organic EL display comprising:
an insulating layer with light-transmission property;
an organic EL element disposed on a back side of the insulating layer;
a diffraction grating disposed on the back side of the insulating layer; and
an optical film disposed on a front side of the insulating layer and comprising optically isotropic first portions and optically anisotropic second portions, the first and second portions forming boundaries inclined with respect to a main surface of the optical film.
2. The display according to claim 1 , wherein at least one optic axis of each of the second portions is parallel to the boundaries.
3. The display according to claim 1 , wherein a normal axis perpendicular to the main surface crosses the boundaries at an angle θ of 5° to 60°.
4. The display according to claim 1 , wherein an absolute value of a difference between a refractive index n of the first portions and an ordinary index n o of the second portions is 0.02 or less.
5. The display according to claim 1 , wherein an absolute value of a difference between an extraordinary index n e and an ordinary index n o of the second portions is 0.1 or more.
6. The display according to claim 1 , wherein a scattering gain of the optical film falls within a range from 10 to 100.
7. The display according to claim 1 , wherein the diffraction grating is disposed between the insulating layer and the organic EL element.
8. The display according to claim 1 , wherein the diffraction grating is disposed on a back side of the organic EL element.
9. An organic EL display comprising:
an insulating layer with light-transmission property;
an organic EL element disposed on a back side of the insulating layer;
a diffraction grating disposed on the back side of the insulating layer; and
an optical film disposed on a front side of the insulating layer and comprising optically isotropic first portions and optically anisotropic second portions, the first and second portions forming a stripe pattern inclined with respect to a main surface of the optical film when a cross section of the optical film perpendicular to the main surface is observed.
10. The display according to claim 9 , wherein at least one optic axis of each of the second portions is parallel to boundaries which the first and second portions form.
11. The display according to claim 9 , wherein the stripe pattern is inclined to the main surface at an angle θ of 5° to 60°.
12. The display according to claim 9 , wherein an absolute value of a difference between a refractive index n of the first portions and an ordinary index n o of the second portions is 0.02 or less.
13. The display according to claim 9 , wherein an absolute value of a difference between an extraordinary index n e and an ordinary index no of the second portions is 0.1 or more.
14. The display according to claim 9 , wherein a scattering gain of the optical film falls within a range from 10 to 100.
15. The display according to claim 9 , wherein the diffraction grating is disposed between the insulating layer and the organic EL element.
16. The display according to claim 9 , wherein the diffraction grating is disposed on a back side of the organic EL element.