Methods of providing tunable warm white light
First Claim
Patent Images
1. A method of generating white light, the method comprising:
- producing light from a first light emitting diode (“
LED”
) string that comprises a blue LED with a peak wavelength of between about 405 nm and about 470 nm;
producing light from a second light emitting diode (“
LED”
) string that comprises a blue LED with a peak wavelength of between about 405 nm and about 470 nm;
producing light from a third light emitting diode (“
LED”
) string that comprises a blue LED with a peak wavelength of between about 405 nm and about 470 nm;
passing the light produced by each of the first, second, and third LED strings through one of a plurality of respective luminophoric mediums to produce a first unsaturated light, a second unsaturated light, and a third unsaturated light, respectively; and
combining the first unsaturated light, the second unsaturated light, and the third unsaturated light together into a fourth unsaturated light;
wherein the first unsaturated light has a first color point within a white color range defined by a polygonal region on the 1931 CIE Chromaticity Diagram defined by the following ccx, ccy color coordinates;
(0.4006, 0.4044), (0.3736, 0.3874), (0.3670, 0.3578), (0.3898, 0.3716);
wherein the second unsaturated light has a second color point within a red color range on the 1931 CIE Chromaticity Diagram defined by a spectral locus between the constant CCT line of 1600K and a line of purples, the line of purples, a line connecting the ccx, ccy color coordinates (0.61, 0.21) and (0.47, 0.28), and the constant CCT line of 1600K;
wherein the third unsaturated light has a third color point within a yellow/green color range on the 1931 CIE Chromaticity Diagram defined by the constant CCT line of 4600K, the Planckian locus between 4600K and 550K, the spectral locus, and a line connecting the ccx, ccy color coordinates (0.445, 0.555) and (0.38, 0.505); and
wherein the fourth unsaturated light corresponds to at least one of a plurality of points along a predefined path near a black body locus in the 1931 CIE Chromaticity Diagram within a 7-step MacAdam ellipse around any point on the black body locus having a correlated color temperature between about 1800K and about 3200K;
wherein the second unsaturated light has a spectral power distribution having relative spectral power intensities of between 0% and 14.8% for wavelengths between 380-420 nm, between 2.1% and 157.8% for wavelengths between 421-460 nm, between 2.0% and 6.7% for wavelengths between 461-500 nm, between 1.4% and 12.2% for wavelengths between 501-540 nm, between 8.7% and 24.7% for wavelengths between 541-580 nm, between 48.5% and 102.8% for wavelengths between 581-620 nm, between 1.8% and 74.3% for wavelengths between 661-700 nm, between 0.5% and 29.5% for wavelengths between 701-740 nm, and between 0.3% and 9% for wavelengths between 741-780 nm, relative to the normalized range for wavelengths between 621-660 nm with a value of 100.0%.
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Abstract
The present disclosure provides methods for generating tunable white light. The methods include using a plurality of LED strings to generate light with color points that fall within white, red, and yellow/green color ranges, with each LED string being driven with a separately controllable drive current in order to tune the generated light output.
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Citations
20 Claims
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1. A method of generating white light, the method comprising:
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producing light from a first light emitting diode (“
LED”
) string that comprises a blue LED with a peak wavelength of between about 405 nm and about 470 nm;producing light from a second light emitting diode (“
LED”
) string that comprises a blue LED with a peak wavelength of between about 405 nm and about 470 nm;producing light from a third light emitting diode (“
LED”
) string that comprises a blue LED with a peak wavelength of between about 405 nm and about 470 nm;passing the light produced by each of the first, second, and third LED strings through one of a plurality of respective luminophoric mediums to produce a first unsaturated light, a second unsaturated light, and a third unsaturated light, respectively; and combining the first unsaturated light, the second unsaturated light, and the third unsaturated light together into a fourth unsaturated light; wherein the first unsaturated light has a first color point within a white color range defined by a polygonal region on the 1931 CIE Chromaticity Diagram defined by the following ccx, ccy color coordinates;
(0.4006, 0.4044), (0.3736, 0.3874), (0.3670, 0.3578), (0.3898, 0.3716);wherein the second unsaturated light has a second color point within a red color range on the 1931 CIE Chromaticity Diagram defined by a spectral locus between the constant CCT line of 1600K and a line of purples, the line of purples, a line connecting the ccx, ccy color coordinates (0.61, 0.21) and (0.47, 0.28), and the constant CCT line of 1600K; wherein the third unsaturated light has a third color point within a yellow/green color range on the 1931 CIE Chromaticity Diagram defined by the constant CCT line of 4600K, the Planckian locus between 4600K and 550K, the spectral locus, and a line connecting the ccx, ccy color coordinates (0.445, 0.555) and (0.38, 0.505); and wherein the fourth unsaturated light corresponds to at least one of a plurality of points along a predefined path near a black body locus in the 1931 CIE Chromaticity Diagram within a 7-step MacAdam ellipse around any point on the black body locus having a correlated color temperature between about 1800K and about 3200K; wherein the second unsaturated light has a spectral power distribution having relative spectral power intensities of between 0% and 14.8% for wavelengths between 380-420 nm, between 2.1% and 157.8% for wavelengths between 421-460 nm, between 2.0% and 6.7% for wavelengths between 461-500 nm, between 1.4% and 12.2% for wavelengths between 501-540 nm, between 8.7% and 24.7% for wavelengths between 541-580 nm, between 48.5% and 102.8% for wavelengths between 581-620 nm, between 1.8% and 74.3% for wavelengths between 661-700 nm, between 0.5% and 29.5% for wavelengths between 701-740 nm, and between 0.3% and 9% for wavelengths between 741-780 nm, relative to the normalized range for wavelengths between 621-660 nm with a value of 100.0%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of generating white light, the method comprising:
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producing light from a first light emitting diode (“
LED”
) string that comprises a blue LED with a peak wavelength of between about 405 nm and about 470 nm;producing light from a second light emitting diode (“
LED”
) string that comprises a blue LED with a peak wavelength of between about 405 nm and about 470 nm;producing light from a third light emitting diode (“
LED”
) string that comprises a blue LED with a peak wavelength of between about 405 nm and about 470 nm;passing the light produced by each of the first, second, and third LED strings through one of a plurality of respective luminophoric mediums to produce a first unsaturated light, a second unsaturated light, and a third unsaturated light, respectively; and combining the first unsaturated light, the second unsaturated light, and the third unsaturated light together into a fourth unsaturated light; wherein the first unsaturated light has a first color point within a white color range defined by a polygonal region on the 1931 CIE Chromaticity Diagram defined by the following ccx, ccy color coordinates;
(0.4006, 0.4044), (0.3736, 0.3874), (0.3670, 0.3578), (0.3898, 0.3716);wherein the second unsaturated light has a second color point within a red color range on the 1931 CIE Chromaticity Diagram defined by a spectral locus between the constant CCT line of 1600K and a line of purples, the line of purples, a line connecting the ccx, ccy color coordinates (0.61, 0.21) and (0.47, 0.28), and the constant CCT line of 1600K; wherein the third unsaturated light has a third color point within a yellow/green color range on the 1931 CIE Chromaticity Diagram defined by the constant CCT line of 4600K, the Planckian locus between 4600K and 550K, the spectral locus, and a line connecting the ccx, ccy color coordinates (0.445, 0.555) and (0.38, 0.505); and wherein the fourth unsaturated light corresponds to at least one of a plurality of points along a predefined path near a black body locus in the 1931 CIE Chromaticity Diagram within a 7-step MacAdam ellipse around any point on the black body locus having a correlated color temperature between about 1800K and about 3200K; wherein the third unsaturated light has a spectral power distribution having relative spectral power intensities of between 0% and 1.1% for wavelengths between 380-420 nm, between 0.9% and 25.3% for wavelengths between 421-460 nm, between 4.2% and 52.7% for wavelengths between 461-500 nm, between 56.6% and 77.5% for wavelengths between 501-540 nm, between 80.5% and 129.5% for wavelengths between 581-620 nm, between 48.4% and 144.9% for wavelengths between 621-660 nm, between 12.6% and 91.6% for wavelengths between 661-700 nm, between 3.2% and 35.3% for wavelengths between 701-740 nm, and between 1% and 10.5% for wavelengths between 741-780 nm, relative to the normalized range for wavelengths between 541-580 nm with a value of 100.0%. - View Dependent Claims (19, 20)
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Specification