Light-emitting device

• US 10,546,824 B2
• Filed: 01/26/2018
• Issued: 01/28/2020
• Est. Priority Date: 08/30/2010
• Status: Active Grant

• Current Assignee: Epistar Corporation
• Original Assignee: Epistar Corporation
• Inventors: Chen, Chao Hsing, Shen, Chien Fu, Ko, Tsun Kai, Hon, Schang Jing, Liu, Hsin Mao
• Primary Examiner(s): Diaz, Jose R
• Application Number:
  US15/881,395
• Publication Number:
  US 20180151516A1
• Time in Patent Office: 732 Days
• CPC Class Codes: H01L 23/60 Protection against electrostatic charges or discharges, e.g. Faraday shields
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 27/153 in a repetitive configuration, e.g. LED bars
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• 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
• 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
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The present disclosure provides a light emitting device including an LED array including a plurality of LED cells connected in series disposed on a single substrate; wherein each LED cell includes a first edge, a second edge, a third edge, and a fourth edge, and wherein the LED array includes a first LED and a second LED, the first edge of the first LED is adjacent to the third edge of the second LED; a first trench, disposed between the first LED cell and the second LED; and a first conducting metal, disposed on the first trench, the first edge of the first LED and the third edge of the second LED, and electrically connecting the first LED and the second LED in series; wherein the first LED and/or the second LED includes a round corner in a top view.

Claims

1. A light emitting device, comprising:

a single substrate;

an LED array disposed on the single substrate, comprising a plurality of LED cells connected in series;

wherein each LED cell comprises a first edge, a second edge, a third edge, and a fourth edge, wherein the first edge and the third edge are opposite, the second edge and the fourth edge are opposite; and

wherein the plurality of LED cells comprises a first one and a second one of the LED cells, the first edge of the first one of the LED cells is adjacent to the third edge of the second one of the LED cells;

a first trench, disposed between the first one of the LED cells and the second one of the LED cells; and

a first conducting metal, disposed on the first trench, the first edge of the first one of the LED cells and the third edge of the second one of the LED cells, and electrically connecting the first one of the LED cells and the second one of the LED cells in series;

wherein each of the LED cells comprises a first semiconductor layer, a second semiconductor layer and an active layer formed therebetween;

wherein the first one of the LED cells and/or the second one of the LED cells comprises a round corner in a top view.

2. The light emitting device as claimed in claim 1 wherein the second one of the LED cells comprises a round corner in a top view.

3. The light emitting device as claimed in claim 1, wherein the round corner comprises a radius of curvature not less than 15 μ

m.

4. The light emitting device as claimed in claim 1 further comprising:

a first insulating layer, filled in the first trench; and

a second insulating layer, disposed on the first insulating layer;

wherein the second insulating layer is thicker than the first insulating layer.

5. The light emitting device as claimed in claim 4, wherein each of the first one LED cell and the second one of the LED cell comprises a side wall near the first edge of the first one of the LED cells and the third edge of the second one of the LED cells, respectively, and the first insulating layer covers the side walls conformably.

6. The light emitting device as claimed in claim 1, wherein the plurality of LED cells further comprises a third one of the LED cells adjacent to the first one of the LED cells, and the second edge of the first LED cell is adjacent to the fourth edge of the third one of the LED cells.

7. The light emitting device as claimed in claim 6, wherein the third one of the LED cells comprises a round corner.

8. The light emitting device as claimed in claim 6, further comprising a second trench, disposed between the first one of the LED cells and the third one of the LED cells;

and a second conducting metal disposed on the second trench, the second edge of the first one of the LED cells and the fourth edge of the third one of the LED cells, and electrically connecting the first one of the LED cells and the third one of the LED cells.

9. The light emitting device as claimed in claim 8, wherein the plurality of the LED cells further comprises a fourth one of the LED cells, and the fourth one of the LED cells is adjacent to the second one of the LED cells;

wherein a third trench is disposed between the second edge of the second one of the LED cells and the fourth edge of the fourth one of the LED cells; and

wherein a third conducting metal is disposed on the third trench, the second edge of the second one of the LED cells and the fourth edge of the fourth one of the LED cells, and electrically connects the second one of the LED cells and the fourth one of the LED cells.

10. A light emitting device as claimed in claim 9, wherein the second conducting metal and the third conducting metal both extend along a direction parallel with the first edge of the first one of the LED cells.

11. A light emitting device as claimed in claim 9, wherein the plurality of LED cells further comprises a fifth one of the LED cells and a sixth one of the LED cells.

12. The light emitting device as claimed in claim 6, wherein the plurality of LED cells further comprises a fourth one of the LED cells and wherein the fourth one of the LED cells is adjacent to the third one of the LED cell, the first edge of the third one of the LED cell is adjacent to the third edge of the fourth one of the LED cells.

13. The light emitting device as claimed in claim 12, further comprising a second trench, disposed between the first edge of the third one of the LED cells and the third edge of the fourth one of the LED cells;

and

a second conducting metal, disposed on the second trench and electrically connecting the third one of the LED cells and the fourth one of the LED cells.

14. A light emitting device as claimed in claim 13, wherein the first conducting metal and the second conducting metal both extend along a direction parallel with the second edge of the first one of the LED cells.

15. A light emitting device as claimed in claim 9, further comprising a first insulating layer, filled in the first trench;

and a second insulating layer, disposed on the first insulating layer;

wherein the first insulating layer and the second insulating layer comprise different material, and wherein the material of the first insulating layer and the second insulating layer comprises AlO_x1, SiO_x2 or SiN_x3.

16. A light emitting device as claimed in claim 9, wherein the plurality of LED cells further comprises a fifth one of the LED cells adjacent to the fourth one of the LED cells, wherein a fourth trench is disposed between the first edge of the fourth one of the LED cells and the third edge of the fifth one of the LED cells;

and a fourth conducting metal is disposed on the fourth trench, the first edge of the fourth one of the LED cells and the third edge of the fifth one of the LED cells, and electrically connects the fourth one of the LED cells and the fifth one of the LED cells.

17. A light emitting device as claimed in claim 16, where one of the second one, the third one, the fourth one and the fifth one of the LED cells comprises a round corner.

18. A light emitting device as claimed in claim 16, wherein the first conducting metal and the fourth conducting metal extend along a direction parallel with the second edge of the first one of the LED cells, and wherein the second conducting metal and the third conducting metal extend along a direction parallel with the first edge of the first one of the LED cells.

19. The light emitting device as claimed in claim 1 further comprising a current blocking layer disposed under the conducting metal, and wherein the current blocking layer is disposed behind a terminal of the conducting metal.

20. The light emitting device as claimed in claim 1, wherein shapes of the first one and the second one of the LED cells are different.