AC LIGHT EMITTING DIODE

• US 20100117101A1
• Filed: 02/01/2010
• Published: 05/13/2010
• Est. Priority Date: 03/13/2007
• Status: Active Grant

• Current Assignee: Seoul Viosys Co., Ltd. (Seoul Semiconductor Co., Ltd.)
• Original Assignee: Seoul Optodevice Company Limited (Seoul Semiconductor Co., Ltd.)
• Inventors: Yoon, Yeo Jin, Kal, Dae Sung, KIM, Dae Won
• Granted Patent: US 7,732,825 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H01L 27/15 including semiconductor components having potential barriers, specially adapted for light emission
• 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

Disclosed herein is an AC light emitting diode. The light emitting diode comprises a plurality of light emitting cells two-dimensionally arranged on a single substrate. Wires electrically connect the light emitting cells to one another to thereby form a serial array of the light emitting cells. Further, the light emitting cells are spaced apart from one another by distances within a range of 10 to 30 μm, and the serial array is operated while connected to an AC power source. Accordingly, the excellent operating characteristics and light output power can be secured in an AC light emitting diode with a limited size.

Claims

1. A light emitting diode, comprising:

a first array of light emitting cells arranged on a substrate; and

a wire to connect the light emitting cells to one another,

wherein the first array comprises at least two light emitting cells connected in series to one another through the wire,

wherein one light emitting cell is spaced apart from a first adjacent light emitting cell in a first direction by a distance in a range of 10 μ

m to 30 μ

m,

wherein the one light emitting cell is spaced apart from a second adjacent light emitting cell in a second direction substantially perpendicular to the first direction by a distance in a range of 10 μ

m to 30 μ

m, and

wherein the light emitting diode is configured to operate on alternating current (AC) power.

2. The light emitting diode of claim 1, further comprising an insulation layer arranged between the wire and the light emitting cells.

3. The light emitting diode of claim 2, wherein the insulation layer comprises silicon oxide or silicon nitride.

4. The light emitting diode of claim 1, further comprising a protection layer arranged on the wire.

5. The light emitting diode of claim 4, wherein the protection layer comprises silicon oxide or silicon nitride.

6. The light emitting diode of claim 1, wherein a distance between a first light emitting cell and a second light emitting cell is different from a distance between a third light emitting cell and a fourth light emitting cell.

7. The light emitting diode of claim 1, further comprising a second array,

wherein the second array comprises at least two light emitting cells connected in series to one another through a wire.

8. The light emitting diode of claim 7, wherein the first array and the second array are configured to operate on AC power.

9. The light emitting diode of claim 8, further comprising:

a shunt wire electrically connecting the wire of the first array to the wire of the second array.

10. The light emitting diode of claim 9, wherein the shunt wire comprises the same material as the wire of the first array and the wire of the second array.

11. The light emitting diode of claim 10, wherein the shunt wire, the wire of the first array, and the wire of the second array are formed using a first process.

12. The light emitting diode of claim 1, further comprising:

pads arranged on the substrate to connect the light emitting diode to an AC power source.

13. The light emitting diode of claim 12, wherein the pads and the light emitting cells comprise an overall tetragonal shape.

14. The light emitting diode of claim 1, further comprising:

a bridge rectifier arranged on the substrate.

15. The light emitting diode of claim 14, wherein the bridge rectifier comprises at least two light emitting cells connected to one another through a wire.

16. The light emitting diode of claim 14, wherein the first array is connected to the bridge rectifier.

17. The light emitting diode of claim 15, wherein the first array is connected to the bridge rectifier.