Backlight assembly with thin film light pipe
View Patent ↗A backlight assembly is provided. The backlight assembly includes a light pipe assembly having a thickness of about 90 microns, a light source and a coupler that receives light from the light source and diffuses the received light from the light source into the first end of the light pipe assembly.
1. A backlight assembly comprising:
a light pipe assembly having a thickness of about 90 microns;
a light source; and
a coupler that receives light from the light source and diffuses the received light from the light source into the first end of the light pipe assembly,
wherein the coupler further comprises a corrective lens.
2. The backlight assembly as in claim 1 , wherein the coupler further comprises a concave surface between the corrective lens and the light source.
3. The backlight assembly as in claim 2 , wherein the coupler further comprises an air gap between the corrective lens and the light source.
4. The backlight assembly as in claim 3 , wherein the air gap further comprises a variable distance beginning with a relatively small distance at a periphery of the concave-shaped corrective lens and a maximum air gap proximate a center of the concave-shaped corrective lens.
5. The backlight assembly as in claim 1 , wherein the coupler further comprises a concave surface between the corrective lens and the light pipe assembly.
6. The backlight assembly as in claim 5 , wherein the coupler further comprises an air gap between the corrective lens and the light source.
7. The backlight assembly as in claim 6 , wherein the air gap further comprises a variable distance beginning with a relatively small distance at a periphery of the concave-shaped corrective lens and a maximum air gap proximate a center of the concave-shaped corrective lens.
8. The backlight assembly as in claim 1 , wherein the coupler further comprises a planar top and a bottom surface with parallel microgrooves disposed perpendicular to an axis of transmission of the light source.
9. The backlight assembly as in claim 1 , wherein the coupler further comprises a stepped structure perpendicular to an axis of transmission of the light source with a first portion that engages the light pipe of a thickness substantially equal to a thickness of the light pipe assembly and a second portion that engages the light source stepped down to a smaller relative thickness than the first portion.
10. The backlight assembly as in claim 9 , wherein the stepped structure further comprises a reflector.
11. A backlight assembly comprising:
a light pipe assembly;
a light source; and
a coupler with a lens disposed between the light source and the light pipe assembly that diffuses light from the light source into the light pipe assembly,
wherein the lens further comprises a concave lens.
12. The backlight assembly as in claim 11 , wherein the coupler further comprises an air gap between the light source and the lens of the coupler.
13. The backlight assembly as in claim 12 , wherein the coupler further comprises an air gap between the lens and the light pipe assembly.
14. The backlight assembly as in claim 13 , wherein the air gaps further comprise a progressive increase in a relative size of the air gap from an edge to a center of the lens.
15. A backlight assembly comprising:
a light pipe assembly;
a light source; and
a coupler with a light receiving portion dimensioned for an angular emission characteristic of the light source,
wherein the angular emission characteristic further comprises half width full maximum.
16. The backlight assembly as in claim 15 , wherein the coupler further comprises an air gap between the coupler and the light source.
17. The backlight assembly as in claim 16 , further comprises a second portion of the coupler disposed between a first portion and the light pipe assembly dimensioned to provide a continuous reflection surface between the second portion and the light pipe assembly.
18. The backlight assembly as in claim 15 , wherein the light source further comprises an array of optical tapers.
19. The backlight assembly as in claim 18 , wherein each optical taper of the array of optical tapers further comprises a square cross-section on one end and a hexagonal cross-section on a second, opposing end.
20. A thin film back light system comprising:
a back light assembly according to any one of claims 1 , 11 , and 15 ;
a light pipe having layers of element structure directing light to an exit; and
a layer of transparent film material with a diffuser pattern that is formed by heat embossing a surface of the transparent film material.