High voltage array light emitting diode (LED) devices and fixtures

• US 8,729,589 B2
• Filed: 11/07/2012
• Issued: 05/20/2014
• Est. Priority Date: 02/16/2011
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Hussell, Christopher P., Britt, Jeffrey C., Athalye, Praneet, Andrews, Peter S., Reiherzer, Jesse C.
• Primary Examiner(s): LE, DUNG ANH
• Application Number:
  US13/671,089
• Publication Number:
  US 20130077299A1
• Time in Patent Office: 559 Days
• Field of Search: 257 12- 13, 257/81, 257/84, 257/88, 257 98-100, 257347-344, 257431-433
• US Class Current: 257/98
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 11/00 Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 characterised by cooling arrangements F21V29/502
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 21/00 Supporting, suspending, or attaching arrangements for lighting devices F21V17/00, F21V19/00 take precedence; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q, stands for supporting apparatus or articles in general F16M11/00; Hand grips
• CPC Class Codes: F21V 7/00 Reflectors for light sources characterised by cooling arrangements F21V29/505
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 25/167 comprising optoelectronic devices, e.g. LED, photodiodes
• 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 2924/12032 Schottky diode
• CPC Class Codes: H01L 2924/1305 Bipolar Junction Transistor [BJT]
• CPC Class Codes: H01L 33/52 Encapsulations
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/325 Pulse-width modulation [PWM]
• CPC Class Codes: H05B 47/10 Controlling the light source

Abstract

High voltage array light emitting devices, fixtures and methods are disclosed. In one embodiment a light emitting device can include a submount, a light emission area disposed over the submount and a retention material adapted to be dispensed about the light emission area. The light emitting device can be operable at high voltages which are greater than approximately 40 volts (V). In one aspect, the retention material can be least partially disposed within the light emission area such that the retention material physically separates a first section of the light emission area from a second section of the light emission area.

Claims

1. A light emitting device, comprising:

a submount;

a light emission area disposed over the submount;

a retention material at least partially disposed within the light emission area such that the retention material physically separates a first section of the light emission area from a second section of the light emission area; and

a driving circuit integrated with the submount, wherein the retention material is disposed over one or more driving elements of the driving circuit.

2. The device of claim 1, wherein the first section comprises one or more light emitting diodes (LEDs) of a first color and the second section comprises one or more LEDs of a second color.

3. The device of claim 2, wherein the first color is principally blue and the second color is principally red.

4. The device of claim 2, wherein the first section comprises a first filling material adapted to emit yellow light when activated by the principally blue LEDs, such that the first section comprises blue shifted yellow (BSY) LEDs.

5. The device of claim 2, wherein the one or more LEDs of the first section are covered by a first filling material and the one or more LEDs of the second section are uncovered.

6. The device of claim 1, wherein the first section and the second section each comprise one or more LEDs of the same color.

7. The device of claim 6, wherein the first section comprises a first filling material adapted to emit light of a first color and the second section comprises a second filling material adapted to emit light of a second color.

8. The device of claim 1, wherein the first section comprises a first string of light emitting diodes (LEDs) that the second section comprises a second string of LEDs.

9. The device of claim 8, wherein the first string is electrically connected in series with the second string.

10. The device of claim 8, wherein the first string is electrically connected in parallel with the second string.

11. The device of claim 1, wherein one of the first and second sections comprises different colored LEDs electrically connected in series.

12. The device of claim 11, further comprising a control circuit operable to maintain aggregate output emissions of the different colored LEDs at a substantially constant color or color temperature in response to various control inputs.

13. The device of claim 12, wherein the control inputs comprise a temperature control input, a current control input, a light control input, and/or a user control input.

14. The device of claim 13, wherein the control inputs are provided via a sensor.

15. The device of claim 12, where the control circuit comprises at least one control element comprising a switch, a transistor, a tunable resistor, a variable resistor, and/or a fuse for controlling aggregate output emissions.

16. The device of claim 11, further comprising a control circuit operable to shift the aggregate output emissions of the different colored LEDs within a color or color temperature regime in response to various control inputs.

17. The device of claim 16, wherein the control inputs comprise a temperature control input, a current control input, a light control input, and/or a user control input.

18. The device of claim 17, wherein the control inputs are provided via a sensor.

19. The device of claims 16, where the control circuit comprises at least one control element comprising a switch, a transistor, a tunable resistor, a variable resistor, and/or a fuse for controlling aggregate output emissions.

20. The device of claim 11, wherein each of the first and second sections comprise different colored LEDs electrically connected in series, and wherein LEDs of the first section are electrically connected in series with LEDs of the second section via electrical connectors that at least partially extend through the retention material.

21. The device of claim 1, wherein the light emitting device is operable between approximately 40 and 300 V.

22. The device of claim 21, wherein the light emitting device is operable at approximately 40 to 50 V, approximately 50 to 100 V, approximately 100 to 200 V, and/or approximately 200 to 300 V.

23. A lighting fixture incorporating the device of claim 1.

24. The device of claim 1, wherein the retention material is at least partially disposed within the light emission area such that the retention material physically separates more than two sections of the light emission area.