LIGHT CHAIN

• US 20090159903A1
• Filed: 09/15/2008
• Published: 06/25/2009
• Est. Priority Date: 12/19/2007
• Status: Active Grant

• Current Assignee: Foxsemicon Integrated Technology Incorporated
• Original Assignee: Foxsemicon Integrated Technology Incorporated
• Inventors: LAI, CHIH-MING, LEE, TSE-AN
• Granted Patent: US 7,989,837 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: F21S 4/10 with light sources attached to loose electric cables, e.g. Christmas tree lights
• 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 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 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A light chain includes a plurality of light emitting diodes (LEDs) electrically connected to each other. Each LED includes an LED chip having a first pole and a second pole, and a packaging layer encapsulating the LED chip. A first electrode has an inner end connected to the first pole, and an outer end extending to the outside of the packaging layer. A second electrode has an inner end connected to the second pole, and an outer end extending to the outside of the packaging layer. A third electrode has a first outer end and a second outer end located at the outside. The outer end of the first electrode and the first outer end cooperatively form a first plug; the outer end of the second electrode and the second outer end cooperatively form a second plug configured to attach to a first plug of an adjacent LED.

Claims

1. A light chain comprising a plurality of light emitting diodes electrically connected to each other, each light emitting diode comprising:

a light emitting diode chip having a first pole and a second pole;

a packaging layer encapsulating the light emitting diode chip;

a first electrode having an inner end received in the packaging layer and electrically connected to the first pole of the light emitting diode chip, and an outer end extending through the packaging layer to the outside;

a second electrode having an inner end received in the packaging layer and electrically connected to the second pole of the light emitting diode chip, and an outer end extending through the packaging layer to the outside; and

a third electrode extending through the packaging layer, the third electrode having a first outer end located at the outside of the packaging layer and a second outer end located at the outside of the packaging layer;

wherein the outer end of the first electrode and the first outer end of the third electrode cooperatively form a first plug;

the outer end of the second electrode and the second outer end of the third electrode cooperatively form a second plug;

the first plug is configured to attach to a second plug of an adjacent light emitting diode.

2. The light chain of claim 1, wherein for each light emitting diode, the first electrode, the second electrode, and the third electrode are parallel to each other.

3. The light chain of claim 2, wherein for each light emitting diode, the first and second electrodes are collinear;

the inner ends of the first and second electrodes face each other and spaced a distance from each other.

4. The light chain of claim 1, wherein for each light emitting diode, the light emitting diode chip is arranged on the second electrode, and the first electrode is connected to the light emitting diode chip by wire bonding.

5. The light chain of claim 1, wherein for each light emitting diode, the outer end of the first electrode and the first outer end of the third electrode are assembled in a first holder;

the outer end of the second electrode and the second outer end of the third electrode are assembled in a second holder;

the first holder of the each light emitting diode is inserted into the second holder of the adjacent light emitting diode.

6. The light chain of claim 1, wherein each light emitting diode further comprises a connecter connected to the first plug of an outmost light emitting diode of the light chain, the connector electrically connects the outer end of the first electrode to the first outer end of the third electrode of the outmost light emitting diode.

7. The light chain of claim 1, wherein for each light emitting diode, the packaging layer is spherical, and the light emitting diode chip is arranged at a center of the packaging layer.

8. The light chain of claim 1, wherein each light emitting diode further comprises a plurality of granules, the plurality of granules is dispersed in the packaging layer or arranged on an emitting surface of the light emitting diode chip for enhancing diffusion of the light emitting diode.

9. The light chain of claim 1, wherein for each light emitting diode, a plurality of diamond powders are dispersed in the packaging layer.

10. A light emitting diode, comprising:

a light emitting diode chip having a pair of poles;

a packaging layer encapsulating the light emitting diode chip;

a first electrode having an inner end received in the packaging layer and electrically connected to a first of the pair of poles of the light emitting diode chip, and an outer end extending through the packaging layer to the outside;

a second electrode having an inner end received in the packaging layer and electrically connected to a second of the pair of poles of the light emitting diode chip, and an outer end extending through the packaging layer to the outside; and

a third electrode extending through the packaging layer, the third electrode having a first outer end located at the outside of the packaging layer and a second outer end located at the outside of the packaging layer;

wherein the outer end of the first electrode and the first outer end of the third electrode cooperatively form a first plug;

the outer end of the second electrode and the second outer end of the third electrode cooperatively form a second plug;

the first plug is configured to attach to a second plug of an adjacent light emitting diode.

11. The light emitting diode of claim 10, wherein the first electrode, the second electrode, and the third electrode are parallel to each other.

12. The light emitting diode of claim 11, wherein the first and second electrodes are collinear, the inner ends of the first and second electrodes face each other and spaced a distance from each other.

13. The light emitting diode of claim 10, wherein the light emitting diode chip is arranged on the second electrode, and the first electrode is connected to the light emitting diode chip by wire bonding.

14. The light emitting diode of claim 10, wherein the outer end of the first electrode and the first outer end of the third electrode of the light emitting diode are assembled in a first holder;

the outer end of the second electrode and the second outer end of the third electrode of the light emitting diode are assembled in a second holder;

the second holder of the light emitting diode is configured to receive the first holder of the adjacent light emitting diode.

15. The light emitting diode of claim 10, wherein the packaging layer is spherical, and the light emitting diode chip is arranged at a center of the packaging layer.

16. The light emitting diode of claim 10, further comprising a plurality of granules dispersed in the packaging layer or arranged on an emitting surface of the light emitting diode chip for enhancing diffusion of the light emitting diode.

17. The light emitting diode of claim 10, wherein a plurality of diamond powders are dispersed in the packaging layer.