LIGHT EMITTING DEVICE

• US 20160027745A1
• Filed: 10/02/2015
• Published: 01/28/2016
• Est. Priority Date: 08/30/2010
• Status: Active Grant

• Current Assignee: Epistar Corporation (Ennostar, Inc.)
• Original Assignee: Epistar Corporation (Ennostar, Inc.)
• Inventors: CHEN, Chao Hsing, SHEN, Chien Fu, KO, Tsun Kai, HON, Schang Jing, LIU, Hsin Mao
• Granted Patent: US 9,893,024 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 a serially-connected LED array comprising a plurality of LED cells on a substrate. The serially-connected LED array includes a first LED cell, a second LED cell, and a serially-connected LED sub-array comprising at least three LED cells intervening between the first and second LED cell; and a plurality of conducting metals formed on the LED cells to electrically connect the plurality of LED cell in series; wherein among the LED sub-array which are continuously and sequentially connected by the conducting metals, each LED cell connects to a previous LED cell by a first connecting direction and connects to a next LED cell by a second connecting direction, the first connecting direction is not parallel to the second connecting direction.

Claims

1. A light emitting device, comprising:

a serially-connected LED array comprising a plurality of LED cells on a substrate, comprising;

a first LED cell, a second LED cell, and a serially-connected LED sub-array comprising at least three LED cells intervening between the first and second LED cell; and

a plurality of conducting metals formed on the LED cells to electrically connect the plurality of LED cell in series;

wherein among the LED sub-array which are continuously and sequentially connected by the conducting metals, each LED cell connects to a previous LED cell by a first connecting direction and connects to a next LED cell by a second connecting direction, the first connecting direction is not parallel to the second connecting direction.

2. The light emitting device as claimed in claim 1, wherein the serially-connected LED array comprises at least eight LED cells with two columns.

3. The light emitting device as claimed in claim 2, wherein the previous LED cell and the next LED cell are arranged in different columns.

4. The light emitting device as claimed in claim 2, wherein the previous LED cell and the next LED cell are arranged in the same column.

5. The light emitting device as claimed in claim 1, wherein each LED cell of the serially-connected LED array comprises four sides, any side of the first LED cell is not neighboring with that of the second LED cell.

6. The light emitting device as claimed in claim 1, wherein each LED cell comprises a first semiconductor layer, an active layer and a second semiconductor layer sequentially formed on the substrate.

7. The light emitting device as claimed in claim 6, wherein the first semiconductor layer and/or the second semiconductor layer comprises a round corner with a radius of the curvature not less than 15 μ

m.

8. The light emitting device as claimed in claim 6, wherein the distance between the first semiconductor layer of the first LED cell and the first semiconductor layer of the second LED cell is smaller than 50 μ

m.

9. The light emitting device as claimed in claim 8, wherein the distance between the first semiconductor layer of the first LED cell and the first semiconductor layer of the second LED cell is larger than 15 μ

m.

10. The light emitting device as claimed in claim 8, wherein the distance between the first semiconductor layer of the first LED cell and the first semiconductor layer of the second LED cell is larger than 30 μ

m.

11. The light emitting device as claimed in claim 6, wherein the first semiconductor layer of one LED cell in the serially-connected LED array is electrically connected to the second semiconductor layer of the adjacent LED cell in the serially-connected LED array.

12. The light emitting device as claimed in claim 1, wherein the conducting metal further comprises an extending part with at least one finger and the at least one finger comprises an enlarged terminal.

13. The light emitting device as claimed in claim 1, wherein the substrate is a single crystalline substrate, and the plurality of LED cells of the series-connected LED array is epitaxially grown on the single substrate.

14. A light emitting device, comprising:

a substrate;

a plurality of LED cells formed on the substrate and arranged in an array; and

a plurality of conducting metals formed on the LED cells to electrically connect the plurality of LED cell in series, and each conducting metal which directly connects two adjacent LED cells defining a connecting direction;

wherein the plurality of LED cells comprises N LED cells, wherein the N LED cells are continuously and sequentially connected by the conducting metals, wherein N≧

6 and the connecting directions change N−

2 times.