Electronic devices having a header and antiparallel connected light emitting diodes for producing light from AC current

• US 7,009,199 B2
• Filed: 10/22/2002
• Issued: 03/07/2006
• Est. Priority Date: 10/22/2002
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Hall, David Charles
• Primary Examiner(s): Tran, Minhloan
• Assistant Examiner(s): Dickey, Thomas L.
• Application Number:
  US10/277,845
• Publication Number:
  US 20040075399A1
• Time in Patent Office: 1,232 Days
• Field of Search: 257/14, 257/18, 257/76, 257/77, 257 79- 81, 257/94, 257 96- 98, 257101-103, 257/190, 257/613, 257/657, 257/673, 257/743, 257/E21.112, 257/E21.125, 257/E21.127, 257/E21.131, 257/E29.091, 257/E29.104, 257/E33.008, 257/E33.028, 257/E33.035, 257/E33.064, 257/E33.068
• US Class Current: 257/14
• 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
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate

Abstract

A light engine comprises a pair of LED active elements mounted on a common header having first and second terminals. The first terminal is connected to the cathode of the first LED active element and the anode of the second LED active element, while the second terminal is connected to the anode of the first LED active element and the cathode of the second LED active element, thereby connecting the LEDs in an anti-parallel arrangement. A light engine having a single insulating or semi-insulating substrate having formed thereon plural LED active elements with associated p- and n-type contacts forming cathode and anode contacts, respectively, for each LED active element is also provided. The LED active elements may be mounted in a flip-chip configuration on a header having a plurality of leads. The header may include a pair of leads adapted such that two LEDs may be flip-mounted thereon with the anode of the first LED and the cathode of the second LED contacting one lead, while the cathode of the first LED and the anode of the second LED contact the other lead. In addition, the header may be adapted to permit a substrate having multiple active elements to be mounted thereon.

Claims

1. An electronic device, comprising:

a header;

a plurality of LED active elements mounted on the header in a flip-chip configuration, wherein at least one of the LED active elements has associated therewith a coating of a wavelength conversion material;

wherein the header is configured to electrically connect respective pairs of the plurality of active elements in anti-parallel manner; and

wherein the respective first and second active elements of the respective pairs are configured to be energized on respective alternating halves of an Alternating Current (AC) waveform so as to emit light from the respective first and second active elements on respective alternating halves of the AC waveform,

wherein the plurality of LED active elements comprise a plurality of discrete LEDs, each of the plurality of discrete LEDs being mounted in a flip-chip configuration on the header.

2. The electronic device of claim 1, wherein the header is further configured to serially electrically connect pairs of the plurality of active elements that are connected in an anti-parallel manner.

3. The electronic device of claim 1, wherein the header is further configured to parallel electrically connect the serially electrically connected pairs of the plurality of active elements that are connected in an anti-parallel manner.

4. The electronic device of claim 1, wherein the header comprises conductive leads disposed to contact adjacent ones of the plurality of active elements such that at least two conductive leads are disposed between each of the plurality of active elements and a substrate of the header.