Subwavelength optical microstructure light-redirecting films
View Patent ↗A waveguide for use in a back lighting device includes a moth-eye structured surface. A back lighting system includes a lighting device, a display panel, and a waveguide for redirecting light generated by the light source toward the display panel. A first light-redirecting film, which can include a plurality of moth-eye structures, can be positioned between the waveguide and the display panel. The first light-redirecting film can also include a plurality of linear prisms. A second light-redirecting film is also provided that can include a plurality of moth-eye structures and a plurality of linear prisms. The second light-redirecting film can be positioned between the first light-redirecting film and the display panel. A diffuser can be positioned between the first light-redirecting film and the waveguide and/or between the second light-redirecting film and the display panel.
1. A waveguide for use in a back lighting display device, the waveguide having a moth-eye structured surface thereon.
2. The waveguide of claim 1 , wherein the waveguide is wedge-shaped.
3. The waveguide of claim 1 , wherein the waveguide is configured to be implemented in a back lighting system.
4. A back lighting system, comprising;
a lighting device;
a display panel; and
a waveguide for redirecting light generated by the lighting device toward the display panel, the waveguide including a plurality of moth-eye structures on at least one surface thereof.
5. The back lighting system of claim 4 , further comprising a first light-redirecting film positioned between the waveguide and the display panel.
6. The back lighting system of claim 5 , wherein the first light-redirecting film includes a plurality of moth-eye structures on a first side of the first light-redirecting film.
7. The back lighting system of claim 6 , wherein the moth-eye structures face the waveguide.
8. The back lighting system of claim 6 , wherein the moth-eye structures face the display panel.
9. The back lighting system of claim 6 , wherein the first light-redirecting film includes a plurality of linear prisms on a second side of the first light-redirecting film, the linear prisms facing the display panel.
10. The back lighting system of claim 5 , further comprising a second light-redirecting film positioned between the first light-redirecting film and the display panel.
11. The back lighting system of claim 10 , further comprising a diffuser positioned between the second light-redirecting film and the display panel.
12. The back lighting system of claim 10 , wherein the second light-redirecting film includes a plurality of moth-eye structures on a first side of the second light-redirecting film, the moth-eye structures facing the first light-redirecting film.
13. The back lighting system of claim 12 , wherein the second light-redirecting film includes a plurality of linear prisms on a second side of the second light-redirecting film, the linear prisms facing the display device.
14. The back lighting system of claim 5 , further comprising a diffuser positioned between the first light-redirecting film and the waveguide.
15. The back lighting system of claim 5 , further comprising a diffuser positioned between the first light-redirecting film and the display panel.
16. The back lighting system of claim 4 , further comprising a reflector for redirecting light toward the waveguide.
17. A light-redirecting film comprising a sheeting having a plurality of prisms on a first side of the film, and a plurality of moth-eye structures on a second side of the film.
18. The light-redirecting film of claim 17 , wherein the prisms include linear prisms.
19. The light-redirecting film of claim 18 , wherein the moth-eye structures include linear moth-eye structures.
20. An optical structure, comprising:
a) a first light-redirecting film having a first surface with a plurality of linear moth-eye structures thereon and a second surface with first linear prisms having peaks; and
b) a second light-redirecting film having a first surface with a plurality of linear moth-eye structures thereon and a second surface with second linear prisms having peaks.
21. The optical structure of claim 20 , further comprising an abrasion reduction layer positioned between the first and second light-redirecting films.
22. The optical structure of claim 20 , further comprising a waveguide positioned adjacent to the first light-redirecting film, the waveguide including a moth-eye structured surface.
23. The optical structure of claim 22 , further comprising a diffuser positioned between the first light-redirecting film and the waveguide.
24. The optical structure of claim 20 , wherein the linear moth-eye structures of the first light-redirecting film are oriented at about ninety degrees relative to the peaks of the first linear prisms.
25. The optical structure of claim 20 , wherein the linear moth-eye structures of the second light-redirecting film are oriented at about ninety degrees relative to the peaks of the second linear prisms.
26. The optical structure of claim 20 , further comprising a diffuser positioned between the second light-redirecting layer and the display panel.
27. The optical structure of claim 20 , wherein the linear moth-eye structures of the second film are substantially parallel to the peaks of the linear prisms of the first film.
28. The optical structure of claim 20 , wherein the linear moth-eye structures of the second film are substantially perpendicular to the peaks of the linear prisms of the first film.
29. The optical structure of claim 20 , wherein the linear moth-eye structures of the first light-redirecting film are substantially parallel to the peaks of the first linear prisms.
30. The optical structure of claim 20 , wherein the linear moth-eye structures of the second light-redirecting film are substantially parallel to the peaks of the second linear prisms.
31. The optical structure of claim 20 , wherein the peaks of the first linear prisms are substantially perpendicular to the peaks of the second linear prisms.
32. The optical structure of claim 20 , wherein the linear moth-eye structures have a pitch between about 150 and 350 nanometers.
33. An optical structure, comprising:
a) a first light-redirecting film having a plurality of linear prisms on one side and a moth-eye structured surface on an opposing side; and
b) a second light-redirecting film having a plurality of linear prisms on one side and a moth-eye structured surface on an opposing side.
34. The optical structure of claim 33 , wherein the moth-eye structured surface of the first and second films includes linear moth-eye structures, the moth-eye structures of the first film being about perpendicular to the linear prisms of the first film and the moth-eye structures of the second film being about perpendicular to the linear prisms of the second film.
35. The optical structure of claim 33 , wherein the moth-eye structured surface of the first and second films includes linear moth-eye structures, the moth-eye structures of the first film being about parallel to the linear prisms of the first film and the moth-eye structures of the second film being about perpendicular to the linear prisms of the second film.
36. The optical structure of claim 33 , wherein the moth-eye structured surface of the first and second films includes linear moth-eye structures, the moth-eye structures of the first film being about perpendicular to the linear prisms of the first film and the moth-eye structures of the second film being about parallel to the linear prisms of the second film.
37. The optical structure of claim 33 , wherein the moth-eye structured surface of the first and second films includes linear moth-eye structures, the moth-eye structures of the first film being about parallel to the linear prisms of the first film and the moth-eye structures of the second film being about parallel to the linear prisms of the second film.
38. The backlighting system of claim 10 , wherein the second light-redirecting film includes a plurality of prisms tilted in opposite directions.
39. The backlighting system of claim 38 , wherein every other prism is tilted in an opposite direction.
40. A light-redirecting film comprising a plurality of prisms having peaks that are about in the same plane, the prisms being tilted in opposite directions.
41. The light-redirecting film of claim 40 , wherein every other prism is tilted in a opposite direction.