Organic light emitting display having improved color shift and visibility
View Patent ↗An optical filter which minimizes color shift, increases brightness and improves visibility and an organic light-emitting display having the same. The optical filter includes a micro pattern film disposed on an organic light-emitting panel. The micro pattern film includes a base material and a micro pattern engraved from the surface of the base material that adjoins the organic light-emitting panel. The micro pattern has a plurality of engraved shapes with a non-circular cross-section which has a depth greater than a width.
1. An optical filter for an organic light-emitting display, comprising a micro pattern film disposed on an organic light-emitting panel, wherein the micro pattern film comprises:
a base material; and
a micro pattern engraved from a surface of the base material that adjoins the organic light-emitting panel, the micro pattern having a plurality of engraved shapes with a non-circular cross-section which has a depth greater than a width.
2. The optical filter of claim 1 , wherein the micro pattern film is isotropic with respect to an optical axis.
3. The optical filter of claim 1 , wherein the plurality of engraved shapes are repeatedly formed at predetermined intervals in one direction in the surface of the base material that adjoins the organic light-emitting panel.
4. The optical filter of claim 1 , wherein each engraved shape has a semi-oval cross-section.
5. The optical filter of claim 1 , wherein the plurality of engraved shapes are filled with air or resin.
6. The optical filter of claim 5 , wherein a refractive index difference between the resin and the base material ranges from 0.1 to 0.3.
7. The optical filter of claim 1 , wherein the base material comprises a light-absorbing material dispersed therein.
8. The optical filter of claim 7 , wherein the light-absorbing material comprises a black pigment including carbon black.
9. The optical filter of claim 1 , further comprising a circular polarizer film disposed on the micro pattern film.
10. The optical filter of claim 9 , wherein the micro pattern film is disposed between the circular polarizer film and the organic light-emitting panel.
11. The optical filter of claim 9 , wherein the circular polarizer film comprises a polarizer film and a λ/4 phase difference film which are stacked on each other.
12. The optical filter of claim 1 , further comprising a circular polarizer film comprising a polarizer film and a λ/4 phase difference film which are stacked on each other,
wherein the micro pattern film is formed on at least one surface of the opposite main surfaces of the λ/4 phase difference film.
13. The optical filter of claim 11 or 12 , wherein the polarizer film comprises a triacetyl cellulose film and a polyvinyl acetate film which are stacked on each other.
14. The optical filter of claim 13 , wherein the base material comprises triacetyl cellulose or polyvinyl acetate.
15. The optical filter of claim 1 , wherein the micro pattern film is directly attached to the organic light-emitting panel.
16. The optical filter of claim 1 , wherein the micro pattern film is attached to the organic light-emitting panel via an adhesive.
17. An organic light-emitting display comprising:
an organic light-emitting panel comprising organic light-emitting devices which emit red, green, blue or white light, the organic light-emitting devices having different heights from each other depending on wavelengths of emitted light; and
an optical filter comprising a micro pattern film disposed on the organic light-emitting panel, the micro pattern film comprising a micro pattern engraved from a surface of a base material that adjoins the organic light-emitting panel, the micro pattern having a plurality of engraved shapes which have a depth greater than a width.
18. The organic light-emitting display of claim 17 , wherein the base material comprises a light-absorbing material dispersed therein.
19. The organic light-emitting display of claim 17 , wherein the optical filter further comprises a circular polarizer film disposed on the micro pattern film.