Overlapping measurement sequences for interference-resistant compensation in light emitting diode devices
First Claim
1. A method for controlling a lamp comprising multiple emission light emitting diode (LED) elements, the method comprising:
- operating one or more of the multiple emission LED elements at a respective substantially continuous drive current sufficient to produce illumination;
bringing to a level insufficient to produce illumination the respective drive current of each of the emission LED elements within the lamp for the duration of each of multiple detection intervals interspersed with periods of said operating;
monitoring a detection photocurrent induced in a detection interval photodetector within the lamp during at least a portion of each of the multiple detection intervals;
detecting, for at least one of the multiple detection intervals, that the monitored detection photocurrent varies substantially with time; and
subsequent to said detecting, initiating a sequence of measurements, wherein;
the sequence comprises multiple measurements taken during multiple corresponding measurement intervals, one measurement per interval;
the sequence comprises one or more sensitive measurements in which photocurrent is detected and one or more non-sensitive measurements in which photocurrent is not detected;
the sensitive measurements in the sequence are performed during measurement intervals during which external illumination sufficient to induce a detection photocurrent that varies substantially with time is not incident upon the lamp; and
at least one non-sensitive measurement in the sequence is performed during a measurement interval during which external illumination sufficient to induce a detection photocurrent that varies substantially with time is incident upon the lamp.
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Accused Products
Abstract
A method and illumination device are provided for interference-resistant compensation in light emitting diode (LED) devices. In one embodiment, the method includes initiating a sequence of measurements during multiple measurement intervals interspersed with periods of illumination. The sequence of measurements includes sensitive measurements performed during measurement intervals when a non-constant external illumination is not present, and at least one non-sensitive measurement performed during an interval when non-constant external illumination is present. An embodiment of an illumination device comprising a lamp includes multiple emission LED elements, one or more photodetectors, a storage medium adapted for storing configuration information, and a lamp control circuit. The configuration information includes ordering of sensitive and non-sensitive measurements within a sequence of compensation measurements that the lamp is configured to perform, and ordering of interfering and non-interfering measurements within an additional sequence of measurements that an additional lamp is configured to perform.
228 Citations
23 Claims
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1. A method for controlling a lamp comprising multiple emission light emitting diode (LED) elements, the method comprising:
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operating one or more of the multiple emission LED elements at a respective substantially continuous drive current sufficient to produce illumination; bringing to a level insufficient to produce illumination the respective drive current of each of the emission LED elements within the lamp for the duration of each of multiple detection intervals interspersed with periods of said operating; monitoring a detection photocurrent induced in a detection interval photodetector within the lamp during at least a portion of each of the multiple detection intervals; detecting, for at least one of the multiple detection intervals, that the monitored detection photocurrent varies substantially with time; and subsequent to said detecting, initiating a sequence of measurements, wherein; the sequence comprises multiple measurements taken during multiple corresponding measurement intervals, one measurement per interval; the sequence comprises one or more sensitive measurements in which photocurrent is detected and one or more non-sensitive measurements in which photocurrent is not detected; the sensitive measurements in the sequence are performed during measurement intervals during which external illumination sufficient to induce a detection photocurrent that varies substantially with time is not incident upon the lamp; and at least one non-sensitive measurement in the sequence is performed during a measurement interval during which external illumination sufficient to induce a detection photocurrent that varies substantially with time is incident upon the lamp. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An illumination device comprising a lamp, wherein the lamp comprises:
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multiple emission light emitting diode (LED) elements; one or more photodetectors; a storage medium adapted for storing a data structure containing configuration information, wherein the configuration information comprises; ordering of sensitive and non-sensitive measurements within a sequence of compensation measurements that the lamp is configured to perform; and ordering of interfering and non-interfering measurements within an additional sequence of measurements that an additional lamp is configured to perform; and a lamp control circuit operably coupled to the multiple emission LED elements, the one or more photodetectors, and the storage medium, wherein the lamp control circuit is adapted to initiate the sequence of compensation measurements. - View Dependent Claims (16, 17, 18)
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19. An illumination device comprising a lamp, wherein the lamp comprises:
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multiple emission light emitting diode (LED) elements; one or more photodetectors; and a lamp control circuit operably coupled to the multiple emission LED elements and the one or more photodetectors, wherein the lamp control circuit is adapted to; operate one or more of the multiple emission LED elements at a respective substantially continuous drive current to produce illumination; bring to a level insufficient to produce illumination the respective drive current of each of the emission LED elements for the duration of each of multiple detection intervals interspersed with periods of said illumination; monitor a detection photocurrent induced in a detection interval photodetector during at least a portion of each of the multiple detection intervals; determine whether the monitored detection current varies substantially with time; and in the event that the monitored detection current does vary substantially with time for at least one of the multiple detection intervals, initiate a sequence of measurements, wherein; the sequence comprises multiple measurements taken during multiple corresponding measurement intervals, one measurement per interval; the sequence comprises one or more sensitive measurements in which photocurrent is detected and one or more non-sensitive measurements in which photocurrent is not detected; the sensitive measurements in the sequence are performed during measurement intervals during which external illumination sufficient to induce a detection photocurrent that varies substantially with time is not incident upon the lamp; and at least one non-sensitive measurement in the sequence is performed during a measurement interval during which external illumination sufficient to induce a detection photocurrent that varies substantially with time is incident upon the lamp. - View Dependent Claims (20, 21, 22, 23)
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Specification