APPARATUS, SYSTEMS AND METHODS FOR A MULTICHANNEL WHITE LIGHT ILLUMINATION SOURCE

• US 20150029713A1
• Filed: 03/11/2013
• Published: 01/29/2015
• Est. Priority Date: 03/19/2012
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Fieberg, Dirk, Piskun, Nadezhda, Piccirillo, Robert
• Granted Patent: US 10,054,272 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21S 8/00 Lighting devices intended for fixed installation F21S9/00, F21S10/00 take precedence; using a string or strip of light sources F21S4/00
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

Methods and apparatus are provided for generating white light at points that are along and near a black body locus. In one embodiment, an illumination source includes a housing (101), at least one first light emitting diode (LED) (102) coupled to the housing and configured to emit green-shifted white light, at least one second LED (104) coupled to the housing and configured to emit blue-shifted white light, and at least one third LED (106) coupled to the housing and configured to emit at least one of a red-orange light and an amber light.

Claims

1. An illumination source, comprising:

a housing;

at least one first light emitting diode (LED) coupled to the housing and configured to emit green-shifted white light;

at least one second LED coupled to the housing and including a phosphor configured to emit blue-shifted white light; and

at least one third LED coupled to the housing and configured to emit at least one of a red-orange light and an amber light.

2. The illumination source of claim 1, wherein the at least one first LED includes a first blue-pump LED having a phosphor configured to emit green-shifted white light.

3. The illumination source of claim 2, wherein the green-shifted white light has CIE 1931 chromaticity coordinates (x, y) within a first region defined by coordinates (0.31, 0.36), (0.34, 0.35), (0.40, 0.54) and (0.42, 0.52).

4. The illumination source of claim 3, wherein the at least one second LED includes a second blue-pump LED.

5. The illumination source of claim 4, wherein the blue-shifted white light has CIE 1931 chromaticity coordinates (x, y) within a second region defined by coordinates (0.278, 0.250), (0.292, 0.270), (0.245, 0.285) and (0.267, 0.320).

6. The illumination source of claim 4, wherein each of first blue-pump LED and the second blue-pump LED is free of red phosphor.

7. The illumination source of claim 1, wherein the at least one third LED is configured to emit red-orange light having a wavelength of approximately 610 nanometers.

8. The illumination source of claim 1, wherein the at least one third LED is configured to emit amber light having a wavelength of approximately 590 nanometers.

9. The illumination source of claim 1, further comprising a controller coupled to a combination of the at least one first LED, the at least one second LED and the at least one third LED, wherein the controller is configured to variably adjust a light output of the combination so as to generate light corresponding to at least one of a plurality of points near a black body locus in a range of correlated color temperatures (CCT) between approximately 2,400K and 6,500K.

10. The illumination source of claim 9, wherein the combination of the at least one first LED, the at least one second LED and the at least one third LED is configured to generate white light adjustable within each of a plurality of ANSI quadrangles including CCT ranges from approximately 2,400K to 6,500K along the black body locus while maintaining an efficiency of greater than 60 lumens/watt.

11. The illumination source of claim 9, wherein the combination of the at least one first LED, the at least one second LED and the at least one third LED is configured to generate white light adjustable within each of a plurality of ANSI quadrangles including CCT ranges from approximately 2,400K to 6,000K along the black body locus while maintaining a color rendering index (CRI) of greater than 85.

12. The illumination source of claim 9, wherein the combination of the at least one first LED, the at least one second LED and the at least one third LED is configured to generate white light adjustable within each of a plurality of ANSI quadrangles including CCT ranges from approximately 2,400K to 5,000K while maintaining an output of greater than 500 lumens.

13. A method of generating light, the method comprising:

generating white light using an illumination source including at least one first light emitting diode (LED) configured to emit green-shifted white light, at least one second LED with a phosphor configured to emit blue-shifted white light, and at least one third LED configured to emit at least one of red-orange light and amber light,

wherein the generated white light corresponds to at least one of a plurality of points near a black body locus.

14. The method of claim 13, further comprising generating the green-shifted white light having CIE 1931 chromaticity coordinates (x, y) within a first region defined by coordinates (0.31, 0.36), (0.34, 0.35), (0.40, 0.54) and (0.42, 0.52).

15. The method of claim 14, further comprising generating the blue-shifted white light having CIE 1931 chromaticity coordinates (x, y) within a second region (212) defined by coordinates (0.278, 0.250), (0.292, 0.270), (0.245, 0.285) and (0.267, 0.320).

16. The method of claim 13, further comprising generating variably adjustable white light in a range of correlated color temperatures (CCT) between approximately 2,400K and 6,500K.

17. The method of claim 16, further comprising generating white light adjustable within each of a plurality of ANSI quadrangles including CCT ranges from approximately 2,400K to 6,500K along the black body locus while maintaining an efficiency of greater than 60 lumens/watt.

18. The method of claim 16, further comprising generating white light adjustable within each of a plurality of ANSI quadrangles including CCT ranges from approximately 2,400K to 6,000K along the black body locus while maintaining a color rendering index (CRI) of greater than 85.

19. The method of claim 16, further comprising generating white light adjustable within each of a plurality of ANSI quadrangles including CCT ranges from approximately 2,400K to 5,000K with an output of greater than 500 lumens.

20. The method of claim 16, further comprising variably generating the white light corresponding to any of the plurality of points near the black body locus using the combination of the at least one first LED, the at least one second LED and the at least one third LED.