Apparatus and method for adjusting the color temperature of white semiconductor light emitters
First Claim
1. A temperature adjustable LED arrangement comprising:
- at least one white LED;
a first drive circuit operable to supply a first drive current to the at least one white LED such that a white light is output at a first intensity;
at least one colored LED arranged such that a colored light is output from the at least one colored LED and combines with the white light to produce a resultant light having a color temperature; and
a second drive circuit operable to supply a second drive current to the at least one colored LED such that the colored light is output at a second intensity, the second drive circuit being adjustable so as to adjust a level of the second drive current supplied so as to vary the color temperature of the resultant light.
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Accused Products
Abstract
An LED arrangement which produces a color temperature adjustable white light. The LED arrangement includes one or more white LEDs and a first drive circuit operable to supply a first drive current to the one or more white LEDs such that a white light is output at a desired intensity. The LED arrangement further includes one or more colored LEDs arranged such that a light output from the one or more colored LEDs combines with the white light to produce a resultant light having a desired color temperature. The colored LEDs are driven by a second drive circuit which supplies a second drive current to the one or more colored LEDs such that a colored light is output at a desired intensity, the intensity of the colored light output from the one or more colored LEDs being adjustable so as to adjust the color temperature of the resultant light.
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Citations
50 Claims
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1. A temperature adjustable LED arrangement comprising:
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at least one white LED;
a first drive circuit operable to supply a first drive current to the at least one white LED such that a white light is output at a first intensity;
at least one colored LED arranged such that a colored light is output from the at least one colored LED and combines with the white light to produce a resultant light having a color temperature; and
a second drive circuit operable to supply a second drive current to the at least one colored LED such that the colored light is output at a second intensity, the second drive circuit being adjustable so as to adjust a level of the second drive current supplied so as to vary the color temperature of the resultant light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A temperature adjustable LED arrangement comprising:
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at least one white LED;
a first drive circuit operable to supply a first drive current to the at least one white LED such that a white light is output at a first intensity;
at least one red LED arranged to output a red light that combines with the white light;
a second drive circuit operable to supply a second drive current to the at least one red LED such that the red light is output at a second intensity;
at least one yellow LED arranged to output a yellow light that combines with the white light and the red light to produce a resultant light having a color temperature;
a third drive circuit operable to supply a third drive current to the at least one yellow LED such that the yellow light is output at a third intensity, the second drive circuit being adjustable so as to adjust a level of the second drive current supplied to the at least one red LED and the third drive circuit being adjustable so as to adjust a level of the third drive current supplied to the at least one yellow LED so as to vary the color temperature of the resultant light. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 49, 50)
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34. A temperature adjustable LED arrangement comprising:
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at least one white LED which outputs a white light;
at least one colored LED which outputs a colored light, the at least one colored LED being arranged at a distance from the at least one white LED such that the output colored light combines with the output white light to produce a resultant light having a color temperature.
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48. A method of adjusting the color temperature of light output from an LED arrangement, the method comprising:
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supplying a first drive current to at least one white LED such that a white light is output at a first intensity;
supplying a second drive current to at least one colored LED such that a colored light is output at a second intensity;
combining the white light with the colored light to produce a resultant light having a desired color temperature; and
adjusting the color temperature of the resultant light by adjusting the second intensity of the colored light.
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Specification