Light emitting diode package and light emitting diode system having at least two heat sinks

• US 7,994,526 B2
• Filed: 05/14/2004
• Issued: 08/09/2011
• Est. Priority Date: 05/28/2003
• Status: Active Grant

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Seoul Semiconductor Co., Ltd.
• Inventors: Park, Kwang Il, Seo, Jung Hoo, Cho, Jae Ho, Han, Kwan Young, Ryu, Seong Ryeol
• Primary Examiner(s): Hoang; Quoc D
• Assistant Examiner(s): Tran; Tony
• Application Number:
  US10/557,820
• Publication Number:
  US 20070063321A1
• Time in Patent Office: 2,643 Days
• Field of Search: 257/676, 257 98-100
• US Class Current: 257/98
• CPC Class Codes: F21Y 2113/17 forming a single encapsulated light source
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/49113 the connectors connecting different bonding areas on the semiconductor or solid-state body to a common bonding area outside the body, e.g. converging wires
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/642 characterized by the shape
• CPC Class Codes: H01L 33/647 the elements conducting electric current to or from the semiconductor body

Abstract

There is provided a light emitting diode package having at least two heat sinks. The light emitting diode package includes a main body, at least two lead terminals fixed to the main body, and at least two heat sinks of electrically and thermally conductive materials, the heat sinks being fixed to the main body. The at least two heat sinks are separated from each other. Thus, high luminous power can be obtained mounting a plurality of light emitting diode dies in one LED package. Further, it is possible to embody polychromatic lights mounting LED dies emitting different wavelengths of light each other in the LED package.

Claims

1. A high power light emitting diode package comprising:

an insulation main body having an opening to a bottom surface;

at least two lead terminals fixed to the main body; and

at least two heat sinks of electrically and thermally conductive metallic materials, the heat sinks being separated from each other and the at least two lead terminals, and fixed to the main body, wherein a lower portion of each of the at least two heat sinks is exposed to the outside of the bottom surface of the main body through the opening of the main body.

2. The package of claim 1, wherein each of the at least two heat sinks has a reflective surface extended from an upper surface thereof.

3. The package of claim 1, wherein the at least two heat sinks are a pair.

4. The package of claim 3, further comprising:

at least one light emitting diode die mounted on upper surfaces of the at least two heat sinks, the die being directly and electrically connected to the heat sinks through a surface of the die.

5. The package of claim 4, further comprising:

bonding wires electrically connecting the at least two lead terminals, the at least two heat sinks and the at least one light emitting diode die.

6. The package of claim 4, further comprising:

a lens attached to the main body, the lens enclosing the at least one light emitting diode die.

7. The package of claim 6, wherein the lens includes an optically transparent material which is directly contacted with the at least one light emitting diode die.

8. The package of claim 4, further comprising:

a fluorescent material converting the wavelength of light emitted from the at least one light emitting diode die.

9. The package of claim 1, further comprising:

light emitting diode dies mounted on the respective heat sinks, the light emitting diode dies emitting different wavelengths of light.

10. The package of claim 9, wherein the at least two lead terminals include:

lead terminals electrically connected to the at least two heat sinks respectively; and

a common lead terminal electrically connected to all of the at least two heat sinks.

11. The package of claim 10, further comprising:

an additional heat sink; and

a zener diode mounted on the additional heat sink.

12. The package of claim 9, wherein the light emitting diode dies include light emitting diode dies emitting a first wavelength of light, a second wavelength of light and a third wavelength of light, respectively.

13. The package of claim 12, wherein the first wavelength, the second wavelength and the third wavelength are red wavelength, green wavelength and blue wavelength, respectively.

14. A light emitting diode system comprising:

the light emitting diode package according to claim 10 or claim 11; and

a controller for controlling the electric power supplied to the light emitting diode package, wherein the controller controls the amount of the current supplied to the respective heat sinks.

15. The package of claim 1, further comprising at least one septum formed in a single body along with the main body to separate the at least two heat sinks.

17. The package of claim 1, wherein the at least two heat sinks each consist of either copper, gold, silver, or aluminum.

16. A high power light emitting diode package comprising:

an insulation main body;

at least two lead terminals fixed to the main body;

at least two heat sinks of electrically and thermally conductive materials, the heat sinks being separated from each other and fixed to the main body, each of the at least two heat sinks having an upper surface and a lower surface, the lower surface of each of the at least two heat sinks being relatively wider than the upper surface of each of the at least two heat sinks; and

a light emitting diode die mounted on one of the upper surfaces of the heat sinks, the light emitting diode die having a lower surface facing the upper surface of each of the at least two heat sinks,

wherein the upper surface of each of the at least two heat sinks is wider than the lower surface of the light emitting diode die, so that the light emitting diode die mounted partly on a portion of the heat sink.

18. The package of claim 16, wherein the at least two heat sinks each consist of either copper, gold, silver, or aluminum.