Light emitting device having light emitting elements

• US 8,084,774 B2
• Filed: 01/12/2009
• Issued: 12/27/2011
• Est. Priority Date: 08/29/2002
• Status: Expired due to Term

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Seoul Semiconductor Co., Ltd.
• Inventors: Sakai, Shiro, Ao, Jin-Ping, Ono, Yasuo
• Primary Examiner(s): Sefer, A.
• Assistant Examiner(s): NGUYEN, DILINH P
• Application Number:
  US12/352,296
• Publication Number:
  US 20090108275A1
• Time in Patent Office: 1,079 Days
• Field of Search: 257/12, 257/13, 257/79, 257/82, 257/83, 257/84, 257/85, 257/88, 257/89, 257/90, 257/92, 257/93, 257/94, 257/95, 257/97, 257/103, 257/164, 257/E51.022, 257/E21.381, 257/E33.025, 257/E33.066, 257/96
• US Class Current: 257/88
• CPC Class Codes: H01L 2224/24 of an individual high density interconnect connector
• CPC Class Codes: H01L 27/15 including semiconductor components having potential barriers, specially adapted for light emission
• 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 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H01L 33/32 containing nitrogen
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/42 Transparent materials
• 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-emitting device operating on a high drive voltage and a small drive current. LEDs (1) are two-dimensionally formed on an insulating substrate (10) of e.g., sapphire monolithically and connected in series to form an LED array. Two such LED arrays are connected to electrodes (32) in inverse parallel. Air-bridge wiring (28) is formed between the LEDs (1) and between the LEDs (1) and electrodes (32). The LED arrays are arranged zigzag to form a plurality of LEDs (1) to produce a high drive voltage and a small drive current. Two LED arrays are connected in inverse parallel, and therefore an AC power supply can be used as the power supply.

Claims

1. A light emitting device, comprising:

a plurality of GaN-based light emitting elements monolithically formed on an insulating substrate, each light emitting element comprising an n-type layer, a p-type layer, a first side, and a second side, the second side being a different side of the light emitting element than the first side; and

a plurality of conductors connecting the plurality of light emitting elements in series, at least one of the plurality of conductors comprising;

a first portion disposed on the n-type layer of a first light emitting element of the plurality of light emitting elements, the first portion having a bent line shape and being disposed on both the first side and the second side of the first light emitting element;

a second portion disposed on the p-type layer of a second light emitting element of the plurality of light emitting elements, the second portion having a bent line shape and being disposed on both the first side and the second side of the second light emitting element; and

a third portion connecting the first portion to the second portion.

2. The light emitting device of claim 1, further comprising:

transparent electrodes disposed on the p-type layers, respectively,

wherein the second portion is disposed on the transparent electrode.

3. The light emitting device of claim 1, wherein the first portion comprises two straight lines connected to each other.

4. The light emitting device of claim 3, wherein the two straight lines are disposed along the first side and the second side of the first light emitting element, respectively.

5. The light emitting device of claim 4, wherein the second portion comprises two straight lines connected to each other and that are disposed along the first side and the second side of the second light emitting element, respectively.

6. The light emitting device of claim 1, wherein the second portion is longer than the first portion.

7. The light emitting device of claim 3, wherein the two straight lines are substantially perpendicular to each other.