HIGH VOLTAGE ARRAY LIGHT EMITTING DIODE (LED) DEVICES AND FIXTURES

• US 20140240974A1
• Filed: 02/25/2014
• Published: 08/28/2014
• Est. Priority Date: 02/16/2011
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Hussell, Christopher P., Reiherzer, Jesse Colin, Britt, Jeffrey Carl, Athalye, Praneet, Andrews, Peter Scott
• Granted Patent: US 9,194,567 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• 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 and fixtures 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; and

a retention material adapted to be dispensed about the light emission area;

wherein the light emitting device is operable at high voltages, the high voltages being approximately 40 volts (V) or greater.

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

3. The device of claim 2, 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.

4. 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 at least a first section of the light emission area from a second section of the light emission area.

5. The device of claim 4, wherein the first section comprises one or more light emitting diodes (LEDs) configured to emit light of a first color and the second section comprises one or more LEDs configured to emit light of a second color.

6. The device of claim 5, wherein the first color is principally blue and the second color is principally red.

7. The device of claim 4, wherein the first section comprises a first string of light emitting diodes (LEDs) and the second section comprises a second string of LEDs.

8. The device of claim 7, wherein the first string is electrically connected in series with the second string.

9. The device of claim 7, wherein the first string is electrically connected in parallel with the second string.

10. The device of claim 5, further comprising a control circuit operable to maintain the aggregate output emissions of the one or more LEDs at a substantially constant color or color temperature in response to a control input.

11. The device of claim 5, further comprising a control circuit operable to shift the aggregate output emissions of the one or more LEDs within a color or color temperature regime for providing dimming compensation in response to a control input.

12. The device of claim 10, wherein the control input comprises a temperature control input, a current control input, a light control input, and/or a user control input.

13. The device of claim 11, wherein the control input comprises a temperature control input, a current control input, a light control input, and/or a user control input.

14. The device of claim 4, wherein the retention material is at least partially disposed within the light emission area such that the retention material physically separate more than two sections of the light emission area.

15. A lighting fixture, comprising:

a light emitting device comprising;

a submount;

a light emission area disposed over the submount; and

a retention material adapted to be dispensed about the light emission area;

wherein the light emitting device is operable at high voltages, the high voltages being greater than approximately 40 volts (V); and

a lens disposed over the light emitting device.

16. The lighting fixture of claim 15, wherein the light emitting device is operable between approximately 40 and 300 V.

17. The lighting fixture of claim 16, 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.

18. The lighting fixture of claim 16, wherein the retention material is 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.

19. The lighting fixture of claim 15, further comprising a diffuser disposed adjacent the lens.

20. The lighting fixture of claim 15, further comprising a reflective surface disposed adjacent the lens.

21. The lighting fixture of claim 18, wherein the first and second sections comprise different colored LEDs electrically connected in series.

22. The lighting fixture of claim 21, 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 one or more control inputs.

23. The lighting fixture of claim 21, further comprising a control circuit adapted to shift aggregate output emissions of the different colored LEDs within a color or color temperature regime in response to one or more control inputs.

24. The lighting fixture of claim 22, wherein the control circuit comprises a switch, a transistor, a tunable resistor, a variable resistor, and/or a fuse for controlling the aggregate output emissions.

25. The lighting fixture of claim 23, wherein the control circuit comprises a switch, a transistor, a tunable resistor, a variable resistor, and/or a fuse for controlling the aggregate output emissions.

26. The lighting fixture of claim 15, 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.