LIGHTING DEVICE AND LIGHTING METHOD

• US 20130235303A1
• Filed: 04/10/2013
• Published: 09/12/2013
• Est. Priority Date: 04/18/2006
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: VAN DE VEN, Antony Paul, Negley, Gerald H.
• Granted Patent: US 9,417,478 B2
• Time in Patent Office: Days
• US Class Current: 349/68
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
• 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 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence

Abstract

A lighting device comprising first and second groups of solid state light emitters, which emit light having peak wavelength in ranges of from 430 nm to 480 nm and from 600 nm to 630 nm, respectively, and a first group of lumiphors which emit light having dominant wavelength in the range of from 555 nm to 585 nm. In some embodiments, if current is supplied to a power line, a combination of (1) light exiting the lighting device which was emitted by the first group of emitters, and (2) light exiting the lighting device which was emitted by the first group of lumiphors would, in an absence of any additional light, produce a sub-mixture of light having x, y color coordinates within an area on a 1931 CIE Chromaticity Diagram defined by points having coordinates (0.32, 0.40), (0.36, 0.48), (0.43, 0.45), (0.42, 0.42), (0.36, 0.38). Also provided is a method of lighting.

Claims

1-20. -20. (canceled)

21. A lighting device comprising:

at least one light source which, when illuminated, emits light which, in an absence of any additional light, has x, y color coordinates which define a point which is within a first area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, the first line segment connecting a first point to a second point, the second line segment connecting the second point to a third point, the third line segment connecting the third point to a fourth point, the fourth line segment connecting the fourth point to a fifth point, and the fifth line segment connecting the fifth point to the first point, the first point having x, y coordinates of 0.32, 0.40, the second point having x, y coordinates of 0.36, 0.48, the third point having x, y coordinates of 0.43, 0.45, the fourth point having x, y coordinates of 0.42, 0.42, and the fifth point having x, y coordinates of 0.36, 0.38; and

a first group of solid state light emitters, the first group of solid state light emitters comprising at least a first solid state light emitter, each of the first group of solid state light emitters, when illuminated, emitting light having a dominant emission wavelength in the range of from about 600 nm to about 630 nm.

22. A lighting device as recited in claim 21, wherein the first group of solid state light emitters comprises at least a first light emitting diode.

23. A lighting device as recited in claim 21, wherein the first group of solid state light emitters comprises at least a first luminescent material.

24. A lighting device as recited in claim 21, wherein said at least one light source, when illuminated, emits light which, in an absence of any additional light, has x, y color coordinates which define a point which is within a second area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third and fourth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.41, 0.455, and said fourth point having x, y coordinates of 0.36, 0.38.

25. A lighting device as recited in claim 21, wherein said at least one light source, when illuminated, emits light which, in an absence of any additional light, would have a CRI of at least 80.

26. A lighting device as recited in claim 21, wherein said lighting device has an efficacy of at least 25 lumens per watt.

27. A lighting device as recited in claim 21, wherein if (1) each of said at least one light source is illuminated, and (2) said first group of solid state light emitters is illuminated, a mixture of light emitted from said at least one light source and said first group of solid state light emitters would produce mixed illumination having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within 40 MacAdam ellipses of at least one point within the range of from about 2200K to about 4500K on the blackbody locus on a 1931 CIE Chromaticity Diagram.

28. A lighting device as recited in claim 21, wherein if (1) each of said at least one light source is illuminated, and (2) said first group of solid state light emitters is illuminated, a mixture of light emitted from said at least one light source and said first group of solid state light emitters would produce mixed illumination having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within 20 MacAdam ellipses of at least one point within the range of from about 2200K to about 4500K on the blackbody locus on a 1931 CIE Chromaticity Diagram.

29. A lighting device as recited in claim 21, wherein if (1) each of said at least one light source is illuminated, and (2) said first group of solid state light emitters is illuminated, a mixture of light emitted from said at least one light source and said first group of solid state light emitters would produce mixed illumination having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within 10 MacAdam ellipses of at least one point within the range of from about 2200K to about 4500K on the blackbody locus on a 1931 CIE Chromaticity Diagram.

30. A lighting device as recited in claim 21, wherein if (1) each of said at least one light source is illuminated, and (2) said first group of solid state light emitters is illuminated, a mixture of light emitted from said at least one light source and said first group of solid state light emitters would produce mixed illumination having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within five MacAdam ellipses of at least one point within the range of from about 2200K to about 4500K on the blackbody locus on a 1931 CIE Chromaticity Diagram.

31. A lighting device as recited in claim 21, wherein if (1) each of said at least one light source is illuminated, and (2) said first group of solid state light emitters is illuminated, a mixture of light emitted from said at least one light source and said first group of solid state light emitters would produce mixed illumination having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within three MacAdam ellipses of at least one point within the range of from about 2200K to about 4500K on the blackbody locus on a 1931 CIE Chromaticity Diagram.

32. An LCD display device comprising:

liquid crystals; and

at least a first light source that comprises at least one non-white luminescent material-converted light emitting diode.

33. An LCD display device as recited in claim 32, wherein the first light source comprises at least one luminescent material which, when illuminated, emits light having a dominant emission wavelength in the range of from about 600 nm to about 630 nm.

34. An LCD display device comprising:

liquid crystals; and

at least one light source that comprises at least a first solid state light emitter and at least a first luminescent material, at least a first portion of light emitted from the first solid state light emitter being converted by the first luminescent material and at least a second portion of light emitted from the first solid state light emitter not being converted by the first luminescent material, the first portion of light and the second portion of light mixing to form mixed light which, in the absence of any other light, would be non-white light.

35. An LCD display device as recited in claim 34, wherein the first solid state light emitter and at least a portion of the first luminescent material are in a packaged device.

36. An LCD display device as recited in claim 34, wherein:

the first solid state light emitter, if illuminated, emits light having a peak wavelength in the range of from 430 nm to 480 nm; and

the first luminescent material, if excited, emits light having a dominant wavelength in the range of from about 555 nm to about 585 nm.

37. An LCD display device as recited in claim 34, wherein:

the at least one light source comprises a first group of solid state light emitters that comprises the first solid state light emitter;

the at least one light source further comprises a second group of solid state light emitters, the second group of solid state light emitters including at least one solid state light emitter; and

if each of the first group of solid state light emitters is illuminated, and each of the second group of solid state light emitters is illuminated, a mixture of (1) light exiting the at least one light source which was emitted by the first group of solid state light emitters, (2) light exiting the at least one light source which was emitted by the first luminescent material and (3) light exiting the at least one light source which was emitted by the second group of solid state light emitters would produce a mixed illumination having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within 40 MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

38. An LCD display device as recited in claim 34, wherein:

the at least one light source comprises a first group of solid state light emitters that comprises the first solid state light emitter;

the at least one light source further comprises a second group of solid state light emitters, the second group of solid state light emitters including at least one solid state light emitter; and

if each of the first group of solid state light emitters is illuminated, and each of the second group of solid state light emitters is illuminated, a mixture of (1) light exiting the at least one light source which was emitted by the first group of solid state light emitters, (2) light exiting the at least one light source which was emitted by the first luminescent material and (3) light exiting the at least one light source which was emitted by the second group of solid state light emitters would produce a mixed illumination having x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within 10 MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

39. An LCD display device as recited in claim 38, wherein each of the second group of solid state light emitters, if illuminated, would emit light having a dominant wavelength in the range of from 600 nm to 630 nm.

40. An LCD display device as recited in claim 34, wherein at least a portion of the first luminescent material is in at least one lumiphor.