Method and apparatus for controlling light output color and/or brightness
First Claim
Patent Images
1. A lighting device, comprising:
- at least a first group of light emitters and a second group of light emitters,a first string and a second string, the first string comprising a first plurality of light emitters, so that when current is supplied to the first string, energy is supplied to the first plurality of light emitters, the second string comprising a second plurality of light emitters, so that when current is supplied to the second string, energy is supplied to the second plurality of light emitters,the first plurality of light emitters comprising at least a first light emitter that emits light having a first color point, and at least a second light emitter that emits light having a second color point, the second color point different from the first color point,the second plurality of light emitters comprising at least a third light emitter that emits light having a third color point and a fourth light emitter that emits light having a fourth color point, the third color point within 0.01 delta u′
, v′
coordinates of the first color point, the fourth color point within 0.01 delta u′
, v′
coordinates of the second color point;
at least a first sensor that detects brightness of at least light that is within 0.01 delta u′
, v′
coordinates of the first color point; and
at least a second sensor that detects brightness of at least light that is within 0.01 delta u′
, v′
coordinates of the second color point,a first ratio, which is equal to (1) the number of light emitters in the first plurality of light emitters that emit light having a color point that is within 0.01 delta u′
, v′
of the first color point divided by (2) the number of light emitters in the first plurality of light emitters that emit light having a color point that is within 0.01 delta u′
, v′
of the second color point,is greater than a second ratio, which is equal to (1) the number of light emitters in the second plurality of light emitters that emit light having a color point that is within 0.01 delta u′
, v′
of the first color point divided by (2) the number of light emitters in the second plurality of light emitters that emit light having a color point that is within 0.01 delta u′
, v′
of the second color point.
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Accused Products
Abstract
A lighting device, comprising first and second light emitters that emit light having first and second color points, respectively, and first and second sensors that detect brightness of light within 0.01 delta u′, v′ of the first and second color points, respectively. A method comprising supplying energy to first and second light, emitters that emit light having first and second color points, respectively, and detecting brightness of light within 0.01 delta u′, v′ of the first and second color points, respectively.
26 Citations
34 Claims
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1. A lighting device, comprising:
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at least a first group of light emitters and a second group of light emitters, a first string and a second string, the first string comprising a first plurality of light emitters, so that when current is supplied to the first string, energy is supplied to the first plurality of light emitters, the second string comprising a second plurality of light emitters, so that when current is supplied to the second string, energy is supplied to the second plurality of light emitters, the first plurality of light emitters comprising at least a first light emitter that emits light having a first color point, and at least a second light emitter that emits light having a second color point, the second color point different from the first color point, the second plurality of light emitters comprising at least a third light emitter that emits light having a third color point and a fourth light emitter that emits light having a fourth color point, the third color point within 0.01 delta u′
, v′
coordinates of the first color point, the fourth color point within 0.01 delta u′
, v′
coordinates of the second color point;at least a first sensor that detects brightness of at least light that is within 0.01 delta u′
, v′
coordinates of the first color point; andat least a second sensor that detects brightness of at least light that is within 0.01 delta u′
, v′
coordinates of the second color point,a first ratio, which is equal to (1) the number of light emitters in the first plurality of light emitters that emit light having a color point that is within 0.01 delta u′
, v′
of the first color point divided by (2) the number of light emitters in the first plurality of light emitters that emit light having a color point that is within 0.01 delta u′
, v′
of the second color point,is greater than a second ratio, which is equal to (1) the number of light emitters in the second plurality of light emitters that emit light having a color point that is within 0.01 delta u′
, v′
of the first color point divided by (2) the number of light emitters in the second plurality of light emitters that emit light having a color point that is within 0.01 delta u′
, v′
of the second color point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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supplying energy to at least a first light emitter that emits light having a first color point; supplying energy to at least a second light emitter that emits light having a second color point, the second color point different from the first color point; detecting brightness of at least light that is within 0.01 delta u′
, v′
coordinates of the first color point;detecting brightness of at least light that is within 0.01 delta u′
, v′
coordinates of the second color point; andcontrolling current supplied to at least the second light emitter based on (1) a ratio of (a) the brightness of at least light that is within 0.01 delta u′
, v′
of the first color point detected by a first sensor to (b) the brightness of at least light that is within 0.01 delta u′
, v′
of the second color point detected by a second sensor, and/or (2) a ratio of (b) the brightness of at least light that is within 0.01 delta u′
, v′
of the second color point detected by a second sensor to (a) the brightness of at least light that is within 0.01 delta u′
, v′
of the first color point detected by a first sensor. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A lighting device, comprising:
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at least a first light emitter that emits light having a first color point; at least a second light emitter that emits light having a second color point, the second color point different from the first color point; at least a first sensor that detects brightness of at least light that is within 0.01 delta u′
, v′
of the first color point;at least a second sensor that detects brightness of at least light that is within 0.01 delta u′
, v′
of the second color point; andat least a first controller that controls current supplied to at least the second light emitter based on (1) a ratio of the brightness detected by the first sensor divided by the brightness detected by the second sensor, and/or (2) a ratio of the brightness detected by the second sensor divided by the brightness detected by the first sensor. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A lighting device, comprising:
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at least a first light emitter that emits light having a first color point; at least a second light emitter that emits light having a second color point, the second color point different from the first color point; at least a first sensor that detects brightness of at least light that is within 0.01 delta u′
, v′
of the first color point; andat least a second sensor that detects brightness of at least light that is within 0.01 delta u′
, v′
of the second color point,the first color point within; (1) an 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/or (2) an 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 0.29, 0.36, the second point having x, y coordinates of 0.32, 0.35, the third point having x, y coordinates of 0.41, 0.43, the fourth point having x, y coordinates of 0.44, 0.49, and the fifth point having x, y coordinates of 0.38, 0.53 (in the 1976 CIE Chromaticity Diagram, the first point has u′
, v′
coordinates of 0.17, 0.48, the second point has u′
, v′
coordinates of 0.20, 0.48, the third point has u′
, v′
coordinates of 0.22, 0.53, the fourth point has u′
, v′
coordinates of 0.22, 0.55, and the fifth point has u′
, v′
coordinates of 0.18, 0.55); andthe second color point is saturated light having a dominant wavelength in the range of from about 600 nm to about 700 nm.
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34. A method, comprising:
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supplying energy to at least a first light emitter that emits light having a first color point; supplying energy to at least a second light emitter that emits light having a second color point, the second color point different from the first color point; detecting brightness of at least light that is within 0.01 delta u′
, v′
of the first color point; anddetecting brightness of at least light that is within 0.01 delta u′
, v′
of the second color point,the first color point within (1) an 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/or (2) an 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 0.29, 0.36, the second point having x, y coordinates of 0.32, 0.35, the third point having x, y coordinates of 0.41, 0.43, the fourth point having x, y coordinates of 0.44, 0.49, and the fifth point having x, y coordinates of 0.38, 0.53 (in the 1976 CIE Chromaticity Diagram, the first point has u′
, v′
coordinates of 0.17, 0.48, the second point has u′
, v′
coordinates of 0.20, 0.48, the third point has u′
, v′
coordinates of 0.22, 0.53, the fourth point has u′
, v′
coordinates of 0.22, 0.55, and the fifth point has u′
, v′
coordinates of 0.18, 0.55); andthe second color point is saturated light having a dominant wavelength in the range of from about 600 nm to about 700 nm.
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Specification