Flat light source module

• US 8,702,295 B2
• Filed: 10/05/2011
• Issued: 04/22/2014
• Est. Priority Date: 10/27/2010
• Status: Active Grant

• Current Assignee: Coretronic Corporation
• Original Assignee: Young Lighting Technology Inc. (Coretronic Corporation)
• Inventors: Lin, Huei-Tzu, Liao, Chun-Chien, Su, Tung-Min
• Primary Examiner(s): Sawhney, Hargobind S
• Application Number:
  US13/253,087
• Publication Number:
  US 20120106198A1
• Time in Patent Office: 930 Days
• Field of Search: 362/249.02, 362/311.02, 362/311.06, 362/545, 362/559, 362/600, 362/608, 362/610, 362/612, 362/613, 362/615, 362/616, 362/621, 362/625, 362/628, 362631-634, 362/800, 362/812
• US Class Current: 362/616
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0045 by shaping at least a portion of the light guide
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like

Abstract

A flat light source module including a light guide plate, a flexible circuit board and a light emitting device is provided. The light guide plate has a light incident surface, a light exit surface and a bottom surface opposite to the light exit surface, wherein the light incident surface further includes a light incident curved surface, and the light incident curved surface is connected with the light exit surface and the bottom surface. The flexible circuit board is disposed beside the light incident curved surface along the light incident curved surface of the light guide plate. The light emitting device is disposed on the flexible circuit board, and the light emitting device has a light emitting surface facing the light incident curved surface.

Claims

1. A flat light source module, comprising:

a light guide plate having a light incident surface, a light exit surface, and a bottom surface, the light exit surface being opposite to the bottom surface, wherein the light incident surface further has a light incident curved surface, a first plane and a second plane opposite to the first plane, and the light incident curved surface is connected with the light exit surface and the bottom surface, wherein the light incident curved surface of the light incident surface further comprises a first curved surface and a second curved surface, the first curved surface is opposite to the second curved surface, the first plane connects the first curved surface and the second curved surface, and the second plane connects the first curved surface and the second curved surface;

a plurality of flexible circuit boards disposed along the light incident curved surface of the light guide plate, wherein the flexible circuit boards comprise a plurality of metal copper-clad laminates, the metal copper-clad laminates are disposed along the first curved surface and the second curved surface, wherein a plurality of metal core printed circuit boards are disposed along the first plane and the second plane; and

light emitting devices disposed on the flexible circuit board and the metal core printed circuit boards, and the light emitting device disposed on the flexible circuit board having a light emitting surface facing the light incident curved surface, wherein the light emitting surface of the light emitting device is parallel to a tangent line of the corresponding light incident curved surface of the light guide plate.

2. The flat light source module as claimed in claim 1, wherein the flexible circuit board comprises a device bonding surface, the device bonding surface faces the light incident curved surface of the light guide plate, and the light emitting device is disposed on the device bonding surface of the flexible circuit board.

3. The flat light source module as claimed in claim 1, wherein the light incident curved surface comprises a circular light incident curved surface or an elliptical light incident curved surface.

4. The flat light source module as claimed in claim 1, wherein curvatures of the first curved surface and the second curved surface are identical.

5. The flat light source module as claimed in claim 1, wherein a thickness of the light guide plate gradually becomes thinner in a direction going away from the light incident surface to a center of the light guide plate.

6. The flat light source module as claimed in claim 5, wherein the light guide plate is a similar wedge-shaped light guide plate.

7. The flat light source module as claimed in claim 1, further comprising a reflector disposed on the bottom surface of the light guide plate.

8. The flat light source module as claimed in claim 1, further comprising an optical film assembly disposed on the light exit surface, wherein the optical film assembly comprises at least one of a diffusion film, a prism film, and a brightness-enhanced film.

9. The flat light source module as claimed in claim 1, wherein the light emitting device is a light emitting diode device.

10. The flat light source module as claimed in claim 1, wherein curvatures of the first curved surface and the second curved surface are different.

11. The flat light source module as claimed in claim 1, further comprising a plurality of light emitting devices disposed on the flexible circuit board, wherein the light emitting surface of each of the plurality of the light emitting devices faces the corresponding light incident curved surface and the flexible circuit board substantially encompasses the corresponding light incident curved surface.

12. The flat light source module as claimed in claim 1, wherein the light incident curved surface is a convex surface with respect to the light guide plate.

13. The flat light source module as claimed in claim 1, wherein a curvature of the flexible circuit board curves along a curvature of the light incident curved surface.

14. The flat light source module as claimed in claim 1, further comprising a plurality of light scattering microstructures disposed on at least one of the bottom surface of the light guide plate and the light exit surface of the light guide plate.

15. The flat light source module as claimed in claim 14, wherein a density of the light scattering microstructures gradually becomes denser in a direction moving away from the light emitting surface.

16. The flat light source module as claimed in claim 14, wherein the light scattering microstructures are uniformly arranged.