Flexible light source module

• US 8,636,381 B2
• Filed: 12/30/2010
• Issued: 01/28/2014
• Est. Priority Date: 12/07/2010
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Huang, Chen-Yang, Hsu, Chao-Kai, Tai, Tsai-Lin
• Primary Examiner(s): GRAMLING, SEAN P
• Application Number:
  US12/981,495
• Publication Number:
  US 20120140464A1
• Time in Patent Office: 1,125 Days
• Field of Search: 362/249.04, 362235-237
• US Class Current: 362/249.04
• CPC Class Codes: F21V 5/002 using microoptical elements for redirecting or diffusing light
• CPC Class Codes: F21Y 2107/10 on concave supports or substrates, e.g. on the inner side of bowl-shaped supports
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/01322 Eutectic Alloys, i.e. obtained by a liquid transforming into two solid phases
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

A flexible light source module including a flexible substrate, a flexible light guide film and a plurality of point light sources is provided. The flexible light guide film including light-guiding portions is disposed on the point light sources. Each of the light-guiding portions includes a light incident surface and a light emitting surface. The light incident surface includes light incident sub-surfaces. The light emitting surface includes light emitting sub-surfaces, and the one closest to the geometric center of the light-guiding portion is a first light emitting sub-surface. The absolute values of the tangent slopes of the first light emitting sub-surface are ascending with approaching the geometric center of the light-guiding portion. The light beams emitted from the point light sources exit out of the flexible light source module via the flexible light guide film so that the flexible light source module provides a uniform planar light source.

Claims

1. A flexible light source module, comprising:

a flexible substrate;

a flexible light guide film disposed on a plurality of point light sources and comprising a plurality of light-guiding portions, wherein each of the light-guiding portions comprises;

a light incident surface comprising a plurality of light incident sub-surfaces, wherein among the light incident sub-surfaces, the one closest to the geometric center of the light-guiding portion is a first light incident sub-surface; and

a light emitting surface opposite to the light incident surface and comprising a plurality of light emitting sub-surfaces, wherein among the light emitting sub-surfaces, the one closest to the geometric center of the light-guiding portion is a first light emitting sub-surface, and the absolute values of the tangent slopes of the first light emitting sub-surface are ascending with approaching the geometric center; and

the point light sources disposed at the flexible substrate, wherein light beams emitted from the point light sources exit out of the flexible light source module via the flexible light guide film, wherein the light incident surface comprises the first light incident sub-surface and a second light incident sub-surface, and the average curvature radius of the first light incident sub-surface is greater than the average curvature radius of the second light incident sub-surface.

2. The flexible light source module as claimed in claim 1, wherein the light emitting surface comprises the first light emitting sub-surface and a second light emitting sub-surface, and the average curvature radius of the first light emitting sub-surface is less than the average curvature radius of the second light emitting sub-surface.

3. The flexible light source module as claimed in claim 2, wherein the absolute values of the tangent slopes of the second light emitting sub-surface are ascending with approaching the geometric center.

4. The flexible light source module as claimed in claim 2, wherein the absolute values of the tangent slopes of the second light emitting sub-surface are firstly descended and then ascending with approaching the geometric center.

5. The flexible light source module as claimed in claim 1, wherein the light emitting surface is a coarse surface.

6. The flexible light source module as claimed in claim 5, wherein the surface haze of the coarse surface ranges between 10% and 90%, and the transmittance thereof ranges between 60% and 99%.

7. The flexible light source module as claimed in claim 1, wherein the absolute values of the tangent slopes of the first light incident sub-surface are descended with approaching the geometric center.

8. The flexible light source module as claimed in claim 1, wherein the absolute values of the tangent slopes of the second light incident sub-surface are descended with approaching the geometric center.

9. The flexible light source module as claimed in claim 1, wherein the first light incident sub-surface is a plane.

10. The flexible light source module as claimed in claim 1, wherein the light incident surface comprises an incident region, and the light beams emitted from the point light sources are incident upon the light-guiding portions via the incident regions.

11. The flexible light source module as claimed in claim 10, wherein the light incident surface further comprises a reflective region, and the light beams come from the point light sources and incident upon the light-guiding portions are transmitted towards the directions of the light emitting surfaces via the reflective regions.

12. The flexible light source module as claimed in claim 11, wherein the reflectance of the reflective region ranges between 90% and 99.99%.

13. The flexible light source module as claimed in claim 1, wherein the geometric shape of the light-guiding portions is polygon, and the flexible light guide film is integrated formed by joining the light-guiding portions together.

14. The flexible light source module as claimed in claim 1, wherein the geometric shape of the light-guiding portions is hexagon, and the flexible light guide film is integrated formed by joining the light-guiding portions together as a honeycomb structure.

15. The flexible light source module as claimed in claim 1, wherein the light-guiding portions are periodically arranged, the interval of the adjacent geometric centers thereof is P, and P is substantially equal to each other and ranges between 5 mm and 40 mm.

16. The flexible light source module as claimed in claim 1, wherein the material of the light-guiding portions comprises at least one of silicon, polypropylene (PP), polymethyl methacrylate (PMMA), polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or polydimethylsiloxane (PDMS).

17. The flexible light source module as claimed in claim 1, wherein the point light sources are disposed correspondingly to the geometric centers of the light-guiding portions one for one.

18. The flexible light source module as claimed in claim 1, wherein the point light sources are light-emitting diode light sources.

19. The flexible light source module as claimed in claim 1, further comprising a diffusion film disposed on the flexible light guide film.

20. The flexible light source module as claimed in claim 19, wherein the diffusion film comprises a plurality of mesh points, and the mesh points are disposed over the point light sources one for one.

21. The flexible light source module as claimed in claim 19, wherein the mesh points are round and the radius thereof ranges between 1 mm and 10 mm.

22. The flexible light source module as claimed in claim 19, wherein the surface haze of the mesh points ranges between 30% and 80%.

23. The flexible light source module as claimed in claim 19, wherein the material of the diffusion film comprises at least one of silicon, polypropylene (PP), polymethyl methacrylate (PMMA), polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or polydimethylsiloxane (PDMS).

24. The flexible light source module as claimed in claim 1, wherein the material of the flexible substrate comprises copper, aluminium, gold or an alloy of any combination thereof.

25. The flexible light source module as claimed in claim 1, wherein the material of the flexible substrate comprises polyimide (PI).

26. The flexible light source module as claimed in claim 1, wherein the flexible substrate comprises a patterned metallic conductive circuit and a plurality of metallic pads, and the point light sources are electrically connected to the flexible substrate through the patterned metallic conductive circuit and the metallic pads.

27. The flexible light source module as claimed in claim 1, wherein the flexible light guide film has corrugated shape, and the corrugated flexible light guide film comprises a plurality of bendable recesses.

28. The flexible light source module as claimed in claim 1, further comprising a diffusion material spread on the flexible light guide film.

29. The flexible light source module as claimed in claim 1, wherein the point light sources are electrically connected to the flexible substrate by wire bonding and die bond or by flip chip bond.