Structure of AC light-emitting diode dies

• US 20060044864A1
• Filed: 11/23/2004
• Published: 03/02/2006
• Est. Priority Date: 08/31/2004
• Status: Active Grant

• Current Assignee: Epistar Corporation
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lin, Ming-Te, Kuo, Chia-Tai, Hwang, Fei-Chang
• Granted Patent: US 7,531,843 B2
• Time in Patent Office: Days
• US Class Current: 365/151
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A structure of light-emitting diode (LED) dies having an AC loop (a structure of AC LED dies), which is formed with at least one unit of AC LED micro-dies disposed on a chip. The unit of AC LED micro-dies comprises two LED micro-dies arranged in mutually reverse orientations and connected with each other in parallel, to which an AC power supply may be applied so that the LED unit may continuously emit light in response to a positive-half wave voltage and a negative-half wave voltage in the AC power supply. Since each AC LED micro-die is operated forwardly, the structure of AC LED dies also provides protection from electrical static charge (ESD) and may operate under a high voltage.

Claims

1. A structure of AC light-emitting diode (LED) dies, comprising a unit of AC LED micro-dies formed on a chip, the unit of AC LED micro-dies having two LED micro-dies arranged in mutually reverse orientations and connected by a conductive bridge in parallel, and the unit of AC LED micro-dies emitting continuously a light when an AC power supply being applied thereon.

2. The structure as recited in claim 1, wherein the two LED micro-dies correspond to a same wavelength.

3. The structure as recited in claim 1, wherein the two LED micro-dies correspond to different wavelengths.

4. The structure as recited in claim 1, wherein the unit of AC LED micro-dies further comprises another LED micro-die.

5. A structure of AC light-emitting diode (LED) dies, comprising a plurality of units of AC LED micro-dies formed on a chip, the plurality of units of AC LED micro-dies connected in series having two LED micro-dies arranged in mutually reverse orientations and connected by a conductive bridge in parallel and the connected plurality of units of AC LED micro-dies jointly emit continuously a light when an AC power supply being applied thereon.

6. The structure as recited in claim 5, wherein the plurality of units of AC LED micro-dies are connected in series.

7. The structure as recited in claim 5, wherein the plurality of units of AC LED micro-dies are connected in parallel.

8. The structure as recited in claim 5, wherein the plurality of units of LED micro-dies are connected in a combination of an in-series connection and an in-parallel connection.

9. The structure as recited in claim 5, wherein the two LED micro-dies correspond to a same wavelength.

10. The structure as recited in claim 5, wherein the two LED micro-dies correspond to different wavelengths.

11. A structure of AC light-emitting diode (LED) dies, comprising a unit of AC LED micro-dies formed on a chip, the unit of AC LED micro-dies comprising at least two in-parallel paths each having a plurality of LED micro-dies in series, the two in-parallel paths connected by a conductive bridge with each other in parallel, each of the plurality of LED micro-dies in series in one of the two in-parallel paths is arranged in mutually reverse orientations and connected in parallel with each of the plurality of LED micro-dies in series in the other of the two in-parallel paths and the unit of AC LED micro-dies emitting continuously a light when an AC power supply being applied thereon.

12. The structure as recited in claim 11, wherein each of the LED micro-dies in the unit of AC LED micro-dies correspond to a same wavelength as those the other LED micro-dies in the unit of AC LED micro-dies correspond.

13. The structure as recited in claim 11, wherein at least one of the LED micro-dies in the unit of AC LED micro-dies corresponds to a different wavelength with those the other LED micro-dies in the unit of AC LED micro-die correspond.

14. The structure as recited in claim 11, wherein the unit of AC LED micro-dies further comprises an in-parallel path comprising a plurality of LED micro-dies in series.

15. A structure of AC light-emitting diode (LED) dies, comprising:

a substrate;

two p-type light-emitting layers formed on the substrate and separated with each other;

two n-type light-emitting layers formed respectively on the two p-type light-emitting layers;

a first pad formed on one of the two p-type light-emitting layers;

a second pad formed on one of the two n-type light-emitting layers and electrically connected to the first pad; and

a conductive bridge connected between the other of the two p-type light-emitting layers and the other of the two n-type light-emitting layers.

16. The structure as recited in claim 15, further comprising an insulating layer disposed on the n-type light-emitting layer in prevention of a short-circuit occurred between the first pad and the second pad and the conductive bridge.

17. The structure as recited in claim 15, further comprising a glue disposed on the structure.

18. The structure as recited in claim 15, further comprising a submount on which the first and second pads formed as a flip-chip.

19. An AC light-emitting diode (LED) die structure, comprising:

a substrate;

a plurality of units of AC LED micro-dies formed on the substrate and each comprising two LED micro-dies formed in mutually reverse orientations and connected in parallel and emits a light respectively when an AC power supply being applied and a positive-half wave voltage thereof being encountered and a negative-half wave voltage thereof being encounter; and

two pads connected to the plurality of units of AC LED micro-dies and receiving the power supply.

20. The structure as recited in claim 19, wherein the LED micro-dies in the plurality of units of AC LED micro-dies correspond to a same wavelength.

21. The structure as recited in claim 19, wherein the LED micro-dies in the plurality of units of AC LED micro-dies correspond to different wavelengths.

22. The structure as recited in claim 19, wherein the plurality of units of AC LED micro-dies are connected in series.

23. The structure as recited in claim 19, wherein the plurality of units of AC LED micro-dies are connected in parallel.

24. The structure as recited in claim 19, wherein the plurality of units of AC LED micro-dies are connected in a combination of an in-series connection and an in-parallel connection.