Light-emitting module

• US 8,777,437 B2
• Filed: 03/11/2008
• Issued: 07/15/2014
• Est. Priority Date: 11/06/2007
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Hsiao, Zhi-Cheng, Hsu, Chao-Kai, Chen, Yu-Hua
• Primary Examiner(s): BANNAN, JULIE A
• Application Number:
  US12/046,419
• Publication Number:
  US 20090116244A1
• Time in Patent Office: 2,317 Days
• Field of Search: 362/97.3, 362/97.2, 362/97.1, 362/252, 362/237
• US Class Current: 362/97.3
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 33/46 Reflective coating, e.g. dielectric Bragg reflector
• CPC Class Codes: H05K 1/0274 Optical details, e.g. printed circuits comprising integral optical means H05K1/0269 takes precedence; coupling light guides with opto-electronic components G02B6/42
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/2054 Light-reflecting surface, e.g. conductors, substrates, coatings, dielectrics

Abstract

A light-emitting module includes a substrate having a first surface and a second surface, at least one light-emitting device disposed on the first surface of the substrate, and an optical reflection layer disposed on the first surface of the substrate and surrounding the light-emitting device for receiving a portion of light emitted from the light-emitting device and reflecting the portion of light. The substrate can be rigid or flexible.

Claims

1. A light-emitting module, comprising:

a substrate, having a first surface and a second surface;

at least a light-emitting device, disposed on the first surface of the substrate; and

an optical reflection layer, disposed on the first surface of the substrate for receiving a portion of light emitted from the light-emitting device and reflecting the portion of light, wherein at least a portion of the optical reflection layer in height is lower than the top of the light-emitting device and the optical reflection layer further comprises;

a transparent polymer material layer; and

a plurality of micro lenses distributed within the transparent polymer material layer.

2. The light-emitting module as claimed in claim 1, wherein the substrate is a rigid substrate.

3. The light-emitting module as claimed in claim 1, wherein the substrate is a flexible substrate.

4. The light-emitting module as claimed in claim 3, wherein a curvature radius of the flexible substrate is 5 cm or more.

5. The light-emitting module as claimed in claim 3, wherein material of the flexible substrate comprises metal and polymer material.

6. The light-emitting module as claimed in claim 1, wherein the micro lenses are of spherical shapes or a combination of different shapes.

7. The light-emitting module as claimed in claim 1, wherein the optical reflection layer has both a reflection function and a diffusion function.

8. The light-emitting module as claimed in claim 7, wherein the diffusion function of the optical reflection layer is used for improving a light uniformity of a planar light source.

9. The light-emitting module as claimed in claim 1, wherein material of the substrate comprises polymer material or metal thin film material.

10. The light-emitting module as claimed in claim 1, further comprising a thermal conductive layer disposed on the second surface of the substrate.

11. The light-emitting module as claimed in claim 10, wherein material of the thermal conductive layer is metal.

12. The light-emitting module as claimed in claim 10, wherein material of the thermal conductive layer is polymer material.

13. The light-emitting module as claimed in claim 1, further comprising an optical diffusion sheet disposed over the first surface of the substrate for reducing a light intensity ratio between an axial light intensity and a surrounding light intensity of the light-emitting device, so as to increase the light uniformity of the planar light source.

14. The light-emitting module as claimed in claim 13, wherein the optical diffusion sheet comprises optical diffusion particles.

15. The light-emitting module as claimed in claim 1, wherein the light-emitting device comprises a light-emitting diode.

16. The light-emitting module as claimed in claim 1, wherein the light-emitting devices are arranged in an array to form a light-emitting plane.

17. The light-emitting module as claimed in claim 1, wherein a leading wire structure is disposed on the substrate for providing a driving power to the light-emitting device.

18. A light-emitting module, comprising:

a substrate, having a first surface and a second surface;

at least a light-emitting device, disposed on the first surface of the substrate; and

an optical reflection layer, disposed on the first surface of the substrate for receiving a portion of light emitted from the light-emitting device and reflecting the portion of light, wherein at least a portion of the optical reflection layer in height is lower than the top of the light-emitting device and the optical reflection layer further has a roughen surface structure for increasing a front reflection of reflected light.

19. The light-emitting module as claimed in claim 18, wherein a periphery region of the roughen surface structure with respect to the light-emitting device is higher than the central region.