LIGHT-EMITTING DIODE DEVICE

• US 20080179615A1
• Filed: 12/13/2007
• Published: 07/31/2008
• Est. Priority Date: 01/26/2007
• Status: Abandoned Application

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Wang, Horng-Jou, Chen, Huang-Kun, KAO, Chi-Hung
• Application Number:
  US11/955,983
• Publication Number:
  US 20080179615A1
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/22 Roughened surfaces, e.g. at the interface between epitaxial layers
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating

Abstract

A light-emitting diode (LED) device includes a substrate, at least one LED element and an optical modulation structure. The LED element is disposed on the substrate and generates a light beam. The optical modulation structure is disposed at one side of the LED element for adjusting a shape of an optical field of the light beam and an intensity distribution of the optical field. The optical modulation structure is formed with a plurality of stepped protrusions.

Claims

1. A light-emitting diode (LED) device, comprising:

a substrate;

at least one LED element disposed on the substrate for generating a light beam; and

an optical modulation structure disposed at one side of the LED element for adjusting a shape of an optical field of the light beam and an intensity distribution of the optical field, wherein the optical modulation structure is formed with a plurality of stepped protrusions.

2. The LED device according to claim 1, wherein the optical modulation structure is a binary optical device.

3. The LED device according to claim 1, wherein the stepped protrusions are arranged in an axially symmetrical manner, a non-axially symmetrical manner or an irregular manner.

4. The LED device according to claim 1, wherein the stepped protrusions has 2ⁿ steps, and n is a positive integer.

5. The LED device according to claim 4, wherein each of the stepped protrusions is a binary optical protrusion.

6. The LED device according to claim 5, wherein each of the stepped protrusions has a flat surface.

7. The LED device according to claim 1, wherein each of the stepped protrusions has a curved surface.

8. The LED device according to claim 1, wherein the optical modulation structure comprises a light-permeable material.

9. The LED device according to claim 8, wherein the light-permeable material is epoxy resin, optical glass, semiconductor, indium tin oxide (ITO), cadmium tin oxide, antimony tin oxide or combinations thereof.

10. The LED device according to claim 1, wherein the optical modulation structure is disposed over the substrate.

11. The LED device according to claim 1, wherein the optical modulation structure and the substrate are integrally formed as a single unit.

12. The LED device according to claim 1, wherein the LED element comprises a first semiconductor layer, an electroluminescent layer and a second semiconductor layer, and the electroluminescent layer is disposed between the first semiconductor layer and the second semiconductor layer.

13. The LED device according to claim 12, further comprising:

an electrode pair, comprising a first contact electrode connected to the first semiconductor layer and a second contact electrode connected to the second semiconductor layer.

14. The LED device according to claim 12, wherein the optical modulation structure faces the LED element and is connected to the second semiconductor layer.

15. The LED device according to claim 12, wherein the optical modulation structure is disposed over the second semiconductor layer and is partially connected to the second semiconductor layer.

16. The LED device according to claim 12, wherein the optical modulation structure is disposed over the second semiconductor layer and is connected to the second semiconductor layer.

17. The LED device according to claim 16, further comprising:

a transparent adhesive layer for adhering the optical modulation structure to the LED element, wherein the transparent adhesive layer comprises epoxy resin.

18. The LED device according to claim 1, further comprising:

a transparent conductive layer disposed between the LED element and the optical modulation structure, wherein the transparent conductive layer comprises indium tin oxide, cadmium tin oxide, antimony tin oxide or combinations thereof.

19. The LED device according to claim 1, wherein the shape of the optical field is a triangular shape, a tetragonal shape or a polygonal shape.

20. The LED device according to claim 1, wherein a light-emitting path of the light beam is formed from the LED element to a to-be-illuminated object, and a lens for adjusting an optical property of the light beam is disposed on the light-emitting path.