Light source with LED and optical protrusions

• US 7,205,719 B2
• Filed: 12/27/2004
• Issued: 04/17/2007
• Est. Priority Date: 12/27/2004
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chen, Chin-Lung, Tain, Ra-Min, Fang, Rong-Chang, Ching, Hei-Tong
• Primary Examiner(s): Williams; Joseph
• Application Number:
  US11/023,692
• Publication Number:
  US 20060138951A1
• Time in Patent Office: 841 Days
• Field of Search: 313/112, 313/512, 313/11, 362234-237, 362/227, 362/249, 362/30
• US Class Current: 313/512
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

A light source with LED and optical protrusions is provided. It comprises an optical panel and at least one optical plate. The light source can be used together with a heat sink or an optical element to enhance its performance. The optical panel forms an optical surface having plural optical protrusions to reflect and mix lights emitted from the LEDs. The optical plate is inserted into at least one slot on the optical panel, and it comprises a heat dissipation core plate and at least one electric circuit layer. The electric circuit layer comprises LEDs and at least one control circuitry. The electric circuit layer can be attached to either single side or both sides of the heat dissipation core plate. The invention achieves good uniformity and high intensity of the combined lights with desired chromaticity.

Claims

1. A light source with light emitting diode (LED) and optical protrusions, comprising:

an optical panel having at least one slot thereon and plural optical protrusions to reflect and combine lights; and

at least one optical plate inserted into said at least one slot on said optical panel, each optical plate having a heat dissipation core plate and at least one electric circuit layer, each said electric circuit layer having at least one LED and at least one control circuitry to control the operation of said LED.

2. The light source with LED and optical protrusions as claimed in claim 1, wherein said LED is bare LED chip that is encapsulated with a transparent material.

3. The light source with LED and optical protrusions as claimed in claim 2, wherein said transparent material is chosen from the group of epoxy and silicone.

4. The light source with LED and optical protrusions as claimed in claim 1, wherein said LED is an LED package.

5. The light source with LED and optical protrusions as claimed in claim 1, wherein said heat dissipation core plate is made of a material chosen from the group of a dielectric material, an electrical conductor, and a thermal conductor.

6. The light source with LED and optical protrusions as claimed in claim 1, wherein the shapes of said optical protrusions include pyramidal, conic, parabolic, and semispherical shapes.

7. The light source with LED and optical protrusions as claimed in claim 1, wherein said electric circuit layer is an insulating layer.

8. The light source with LED and optical protrusions as claimed in claim 1, wherein said control circuitry is stacked on said electric circuit layer.

9. The light source with LED and optical protrusions as claimed in claim 1, wherein said control circuitry is printed on said electric circuit layer.

10. The light source with LED and optical protrusions as claimed in claim 2, wherein said bare LED chips are attached to said electric circuit layer via a flip chip.

11. The light source with LED and optical protrusions as claimed in claim 2, wherein said bare LED chips are attached to said electric circuit layer via wire bonding.

12. The light source with LED and optical protrusions as claimed in claim 2, wherein said bare LED chips are attached to said electric circuit layer in a way such that their chips surfaces face said optical protrusions.

13. The light source with LED and optical protrusions as claimed in claim 1, wherein adjacent said LEDs emit lights of different colors.

14. The light source with LED and optical protrusions as claimed in claim 1, wherein adjacent said LEDs emit lights of same colors.

15. The light source with LED and optical protrusions as claimed in claim 1, wherein each optical plate includes a heat dissipation core plate and two electric circuit layers, and one electric circuit layer is attached to each side of the heat dissipation core plate.

16. The light source with LED and optical protrusions as claimed in claim 1, wherein each optical plate includes a heat dissipation core plate and one electric circuit layer, said electric circuit layer is attached to single side of the heat dissipation core plate.

17. The light source with LED and optical protrusions as claimed in claim 1, wherein said light source further comprises a heat sink that is attached to said optical panel to enhance heat dissipation.

18. The light source with LED and optical protrusions as claimed in claim 1, wherein said light source further comprises an optical element that is used to guide said combined light towards a display screen.

19. The light source with LED and optical protrusions as claimed in claim 7, wherein said electric circuit layer is chosen from the group of printed circuit board, oxide, and ceramic material.

20. The light source with LED and optical protrusions as claimed in claim 18, wherein said optical element is a light diffuser.

21. The light source with LED and optical protrusions as claimed in claim 18, wherein said optical element is a wave guide.

22. The light source with LED and optical protrusions as claimed in claim 18, wherein each optical plate includes a heat dissipation core plate and two electric circuit layers, and one electric circuit layer is attached to each side of the heat dissipation core plate.

23. The light source with LED and optical protrusions as claimed in claim 18, wherein each optical plate includes a heat dissipation core plate and one electric circuit layer, and the electric circuit layer is attached to single side of the heat dissipation core plate.