Light emitting apparatus

• US 20050045897A1
• Filed: 05/10/2004
• Published: 03/03/2005
• Est. Priority Date: 08/27/2003
• Status: Abandoned Application

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Liu, Pang-Hsuan, Chou, Shen-Hong
• Application Number:
  US10/841,463
• Publication Number:
  US 20050045897A1
• Time in Patent Office: Days
• US Class Current: 257/98
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A light emitting apparatus at least includes a circuit board, several light emitting diodes (LEDs), a first reflective substance, and a diffusion structure. The LEDs, including red (R), green (G), and blue (B) LEDs, are disposed on the circuit board and connected therewith, and the first reflective substance is disposed on the circuit board and having a plurality of cavities for the LEDs. The diffusion structure is disposed on the circuit board and covering the LEDs. The diffusion structure includes several indentations, a transparent main body and several diffusion beads. The indentations are formed on a bottom surface of the diffusion structure and face the LEDs to accommodate the LEDs. The diffusion beads are dispersed in the transparent main body and diffuse light emitted from the LEDs so that light emitted from R/G/B LEDs can be mixed into white light more sufficiently through the diffusion structure.

Claims

1. A light emitting apparatus, at least comprising:

a circuit board;

a plurality of light emitting diodes (LEDs), disposed on the circuit board and connected therewith;

a first reflective substance, disposed on the circuit board and having a plurality of cavities for the LEDs; and

a diffusion structure, disposed on the circuit board and covering the LEDs, wherein the diffusion structure comprises a plurality of indentations, a transparent main body and a plurality of diffusion beads;

the indentations are formed on a bottom surface of the diffusion structure and face the LEDs to accommodate the LEDs;

the diffusion beads are dispersed in the transparent main body and diffuse light emitted from the LEDs.

2. The light emitting apparatus according to claim 1, wherein the material of the transparent main body is polymethyl methacrylate (PMMA) or glass.

3. The light emitting apparatus according to claim 1, wherein the refractive index of the diffusion beads is about 1.4 to 2.

4. The light emitting apparatus according to claim 1, wherein the first reflective substance is disposed on the circuit board by coating or by sticking with paste.

5. The light emitting apparatus according to claim 1, wherein the material of the first reflective substance is polyethylene terephthalate (PET).

6. The light emitting apparatus according to claim 1, wherein the light emitting apparatus further comprises a second reflective substance disposed on a side surface of the diffusion structure.

7. The light emitting apparatus according to claim 6, wherein the second reflective substance is disposed on the diffusion structure by coating or by sticking with paste.

8. The light emitting apparatus according to claim 6, wherein the material of the second reflective substance is PET.

9. The light emitting apparatus according to claim 1, wherein the circuit board is a printed circuit board (PCB).

10. The light emitting apparatus according to claim 1, wherein the transparent main body and the diffusion beads are made by injection molding.

11. The light emitting apparatus according to claim 1, wherein the indentations are hemisphere-shaped or bowl-shaped.

12. The light emitting apparatus according to claim 1, wherein the LEDs comprises a plurality of red (R), green (G), and blue (B) LEDs.

13. A light emitting apparatus, at least comprising:

a PCB;

a plurality of R/G/B LEDs, disposed on the PCB and connected therewith;

a first reflective substance, disposed on the PCB and having a plurality of cavities for the R/G/B LEDs; and

a diffusion structure, disposed on the PCB and covering the R/G/B LEDs, wherein the diffusion structure comprises a plurality of indentations, a transparent main body and a plurality of diffusion beads;

the indentations are formed on a bottom surface of the diffusion structure and face the R/G/B LEDs to accommodate all LEDs;

the diffusion beads are dispersed in the transparent main body made of PMMA or glass, and diffuse light emitted from the R/G/B LEDs.

14. The light emitting apparatus according to claim 13, wherein the refractive index of the diffusion beads is about 1.4 to 2.

15. The light emitting apparatus according to claim 13, wherein the first reflective substance is disposed on the PCB by coating or by sticking with paste.

16. The light emitting apparatus according to claim 13, wherein the transparent main body and the diffusion beads are made by injection molding.

17. The light emitting apparatus according to claim 13, wherein the material of the first reflective substance is PET.

18. The light emitting apparatus according to claim 13, wherein the light emitting apparatus further comprises a second reflective substance disposed on a side surface of the diffusion structure.

19. The light emitting apparatus according to claim 18, wherein the second reflective substance is disposed on the diffusion structure by coating or by sticking with paste.

20. The light emitting apparatus according to claim 18, wherein the material of the second reflective substance is PET.

21. The light emitting apparatus according to claim 13, wherein the indentations are hemisphere-shaped or bowl-shaped.