Alternating current light-emitting device

• US 7,474,681 B2
• Filed: 10/07/2005
• Issued: 01/06/2009
• Est. Priority Date: 05/13/2005
• Status: Active Grant

• Current Assignee: Epistar Corporation (Ennostar, Inc.)
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lin, Ming-Yao, Huang, Sheng-Pan, Yeh, Wen-Yung, Lin, Ming-Te, Yen, Hsi-Hsuan
• Primary Examiner(s): Harvey; Minsun
• Assistant Examiner(s): Zhang; Yuanda
• Application Number:
  US11/245,255
• Publication Number:
  US 20060256826A1
• Time in Patent Office: 1,187 Days
• Field of Search: 372/50.1, 372/50.12, 372/50.121, 372/68, 372/43.01, 372/45.01, 372/96, 250/221, 250/551
• US Class Current: 372/43.01
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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

Abstract

An alternating current light emitting device and the fabrication method includes forming one or more alternating current micro diode light emitting modules on a substrate, wherein the alternating current micro diode light emitting module has two micro diodes connected to one another, and each micro diode has at least two active layers and is electrically connected by a conductive structure, such that the active layers of each micro diode can take turns emitting light during the positive/negative half cycles of alternating current. A continuous and full-scale light emitting effect is thereby achieved.

Claims

1. An alternating current light emitting device comprising:

a substrate;

a bridge light-emitting unit formed on the substrate including;

a plurality of alternating current light emitting micro diodes wherein each alternating current light emitting micro diode has at least one active layer, active layers of a first group of the alternating current light emitting micro diodes being arranged on four peripheral arms of a bridge rectifier, active layers of a second group of the alternating current light emitting micro diodes being arranged on a connecting arm connecting first and second diagonally opposed corners of the bridge rectifier, and

first and second unit conductive electrodes being disposed at third and fourth diagonally opposed corners of the bridge rectifier, respectively for connecting with alternating current; and

a conductive structure electrically connected to each of the alternating current light emitting micro diodes so as to allow the active layers of the first group of the alternating current light emitting micro diodes to alternately emit light during positive and negative half cycles of alternating current and allow the active layers of the second group of the alternating current light emitting micro diodes to emit light during both positive and negative half cycles of alternating current.

2. The alternating current light emitting device of claim 1, wherein the first unit conductive electrode, the second unit conductive electrode and the active layers of the alternating current light emitting micro diodes are electrically coupled to each other for connecting with alternating current.

3. The alternating current light emitting device of claim 1 further comprising

a plurality of the bridge light-emitting units,

wherein the plurality of the bridge light-emitting units are electrically coupled to each other.

4. The alternating current light emitting device of claim 3, wherein the plurality of the bridge light-emitting units are arranged in a matrix.

5. The alternating current light emitting device of claim 1, wherein the substrate comprises an insulating substrate.

6. The alternating current light emitting device of claim 1, wherein each active layer of the alternating current light emitting micro diodes emits light of identical wavelengths.

7. The alternating current light emitting device of claim 1, wherein at least each of the second group of alternating current light emitting micro diodes has at least two active layers, each active layer emitting light of different wavelengths.

8. The alternating current light emitting device of claim 3 further comprising first and second matrix conductive electrodes, wherein the first and second conductive electrodes are electrically coupled to the plurality of the bridge light-emitting units for connecting with alternating current.

9. The alternating current light emitting device of claim 8, wherein the first and second matrix conductive electrodes are disposed at first and second diagonally opposed corners of the matrix respectively.