Multiple configuration light emitting devices and methods

• US 9,627,361 B2
• Filed: 01/31/2011
• Issued: 04/18/2017
• Est. Priority Date: 10/07/2010
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Andrews, Peter S., Rosado, Raymond, Laughner, Michael P., Emerson, David T., Britt, Jeffrey C.
• Primary Examiner(s): Nguyen, Cuong B
• Application Number:
  US13/017,575
• Publication Number:
  US 20120086024A1
• Time in Patent Office: 2,269 Days
• Field of Search: 257 79-103, 257666-677, 257748-749, 257781-784, 257E33066, 257E23031-E2305, 257E23141, 438110-111, 438121-127
• CPC Class Codes: H01L 2224/48091 Arched
• 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 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/01322 Eutectic Alloys, i.e. obtained by a liquid transforming into two solid phases
• CPC Class Codes: H01L 2924/19107 off-chip wires
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• 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

Multiple configuration light emitting diode (LED) devices and methods are disclosed wherein LEDs within the device can be selectively configured for use in higher voltage, or variable voltage, applications. Variable arrangements of LEDs can be configured. Arrangements can include one or more LEDs connected in series, parallel, and/or a combination thereof. A surface over which one or more LEDs may be mounted can comprise one or more electrically and/or thermally isolated portions.

Claims

1. A multi-configurable light emitting diode (LED) device comprising:

a mounting area comprising an anode pad, a cathode pad, and a plurality of intermediate pads disposed between the anode pad and the cathode pad, wherein the intermediate pads are separated from the anode pad and the cathode pad by a plurality of gaps; and

a plurality of LEDs disposed over the mounting area, wherein at least two of the plurality of LEDs are electrically configured in parallel when a first intermediate pad of the plurality of intermediate pads is connected to the anode pad via a connector that extends across at least one gap of the plurality of gaps and wherein each of the plurality of LEDs are serially connected when the first intermediate pad of the plurality of intermediate pads is not connected to the anode pad.

2. The LED device according to claim 1, further comprising a submount, wherein the mounting area is disposed over the submount.

3. The LED device according to claim 1, wherein the first intermediate pad connects to the anode pad via wires extending across a gap disposed between the first intermediate pad and the anode pad.

4. The LED device according to claim 1, wherein the LEDs are configured to emit a same color of light.

5. The LED device according to claim 1, wherein the device comprises four LEDs.

6. The LED device according to claim 5, wherein a first LED and a second LED are connected in parallel with a third LED and a fourth LED when the first intermediate pad of the plurality of intermediate pads is connected to the anode pad.

7. The LED device according to claim 6, wherein the first LED and the second LED are serially connected and wherein the third LED and the fourth LED are serially connected.

8. The LED device according to claim 1, further comprising a lens arranged over the plurality of LEDs.

9. The LED device according to claim 1, wherein the mounting area comprises at least two intermediate pads disposed between the anode pad and the cathode pad.

10. The LED device according to claim 1, wherein the mounting area comprises three intermediate pads disposed between the anode pad and the cathode pad.

11. The LED device according to claim 1, wherein the LED device is operable at a first voltage when the first intermediate pad of the plurality of intermediate pads is connected to the anode pad and wherein the LED device is operable at a second voltage when the first intermediate pad of the plurality of intermediate pads remains separate from the anode pad.

12. The LED device according to claim 1, wherein at least one LED of the plurality of LEDs is arranged over each of the plurality of intermediate pads.

13. A multi-configurable light emitting diode (LED) device comprising:

a mounting pad comprising a plurality of electrically isolated portions, wherein at least one of the electrically isolated portions comprises an anode and at least one other of the electrically isolated portions comprises a cathode and wherein remaining electrically isolated portions are disposed between portions of the anode and the cathode;

a plurality of LEDs, each arranged over a different one of the electrically isolated portions of the mounting pad for forming a tight point source of light over the plurality of electrically isolated portions,

wherein the plurality of LEDs are operable at a first voltage range when a first electrically isolated portion of the plurality of electrically isolated portions is connected to the anode via a connector, and wherein the plurality of LEDs are operable at a second voltage range when the first electrically isolated portion of the plurality of electrically isolated portions is not connected to the anode, and

wherein the first voltage range is different than the second voltage range.

14. The LED device according to claim 13, wherein the plurality of LEDs emit a same color of light.

15. The LED device according to claim 13, wherein each of the electrically isolated portions are separated from each other by one or more gaps disposed therebetween.

16. The LED device according to claim 13, wherein the connector comprises a wire.

17. The LED device according to claim 13, wherein the mounting pad and the at least one of the electrically isolated portions comprising the anode and the at least one other of the electrically isolated portions comprising the cathode comprise a conductive pattern where at least a portion of the mounting pad extends from the at least one other of the electrically isolated portions comprising the cathode.

18. The LED device according to claim 13, further comprising a submount.

19. The LED device according to claim 18, wherein a lens is disposed over the submount.

20. The LED device according to claim 17, further comprising a protective layer disposed over the conductive pattern.

21. The LED device according to claim 13, wherein the first voltage range is between approximately 3 volts (V) and 12V and wherein the second voltage range is greater than 12V.

22. A method for selectively configuring light emitting diodes (LEDs), the method comprising:

providing an LED device comprising;

a mounting area comprising an anode pad, a cathode pad, and a plurality of intermediate pads disposed between the anode pad and the cathode pad, wherein the intermediate pads are separated from the anode pad and the cathode pad by a plurality of gaps; and

a plurality of LEDs disposed over the mounting area, wherein at least two of the plurality of LEDs are selectively configurable in multiple different electrical arrangements, including a parallel arrangement and a serial arrangement,

wherein the at least two LEDs are configurable in the parallel arrangement when a first intermediate pad of the plurality of intermediate pads is connected to the anode pad via a connector extending across at least one gap of the plurality of gaps and

wherein the at least two LEDs are configurable in the serial arrangement when the first intermediate pad of the plurality of intermediate pads is not connected to the anode pad;

and

selecting an electrical arrangement from the multiple different electrical arrangements and configuring the at least two LEDs according to the electrical arrangement selected.

23. The method according to claim 22, further comprising:

providing a first group of LEDs arranged over the mounting pad;

providing a second group of LEDs arranged over the mounting pad; and

selectively configuring the second group of LEDs by electrically connecting the LEDs of the second group in series or in parallel.

24. The method according to claim 23, further comprising electrically connecting the first group of LEDs in parallel with the second group of LEDs.

25. The method according to claim 22, wherein the plurality of LEDs are all a same color.

26. The method according to claim 22, wherein the plurality of LEDs are different colors.

27. The method according to claim 22, comprising selectively configuring the LED device to operate at different desired voltages.

28. A multi-configurable light emitting diode (LED) device comprising:

a plurality of electrically isolated portions, each of the plurality of electrically isolated portions being separated by a gap, wherein at least one of the plurality of electrically isolated portions comprises an anode and at least one other of the plurality of electrically isolated portions comprises a cathode, and wherein the remaining electrically isolated portions are disposed between portions of the anode and the cathode;

a plurality of LEDs each arranged over at least a different one of the electrically isolated portions; and

wherein the LEDs are selectively configurable in multiple different electrical arrangements between the at least one of the plurality of electrically isolated portions which comprises the anode and the at least one of the plurality of electrically isolated portions which comprises the cathode, including each of the following arrangements between the anode and the cathode;

(i) each LED is connected in series with each other LED when a first electrically isolated portion is connected to the cathode by a connector extending across a gap therebetween, a last electrically isolated portion is connected to the anode by a connector extending across a gap therebetween, and each remaining electrically isolated portion is connected only to immediately preceding and proceeding electrically isolated portions by a connector extending across gaps therebetween, and

(ii) at least one LED is connected both in series and in parallel with at least one other LED when at least two of the electrically isolated portions are connected to the anode via a connector extending across the gap.