LED array having array-based LED detectors
First Claim
1. An optical system, comprising:
- an array light-emitting diodes arranged to perform an operation, the operation having one or more characteristics of the light emitting diodes in association with a particular area of the array;
at least one of the light-emitting diodes in the array being configured solely as a detector electrically connected to a circuit different from that of the other light-emitting diodes, the circuit to apply a reverse electrical bias to the detector light-emitting diode, the detector light-emitting diode arranged to operate in a photovoltaic mode and having its output coupled to a trans-impedance amplifier to generate a signal proportional to a photocurrent from the detector, the detector located in a selected position in the array to monitor one or more characteristics of the light emitting diodes of the particular area of the array; and
a controller configured to control the particular area of the array responsive, at least in part, to the signal from the at least one detector.
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Accused Products
Abstract
The present invention provides an optical system having an array of light emitting semiconductor devices to performing an operation that have multiple characteristics associated with performing the operation. The array includes at least one detector located within the array to selectively monitor multiple characteristics of the light emitting semiconductor devices and is configured to generate a signal corresponding to the selected characteristic. A controller is configured to control the light emitting semiconductor devices in response to the signal from the at least one detector. At least one of the multiple characteristics may be concentrated at an area of the array and the at least one detector may be located within the array at the area of the array to selectively monitor characteristic that is concentrated at the area of the array.
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Citations
14 Claims
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1. An optical system, comprising:
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an array light-emitting diodes arranged to perform an operation, the operation having one or more characteristics of the light emitting diodes in association with a particular area of the array; at least one of the light-emitting diodes in the array being configured solely as a detector electrically connected to a circuit different from that of the other light-emitting diodes, the circuit to apply a reverse electrical bias to the detector light-emitting diode, the detector light-emitting diode arranged to operate in a photovoltaic mode and having its output coupled to a trans-impedance amplifier to generate a signal proportional to a photocurrent from the detector, the detector located in a selected position in the array to monitor one or more characteristics of the light emitting diodes of the particular area of the array; and a controller configured to control the particular area of the array responsive, at least in part, to the signal from the at least one detector. - View Dependent Claims (2, 3)
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4. An optical system for performing an operation on a work piece, comprising:
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an array of light-emitting diodes; at least one of such light-emitting diodes in the array electrically configured in a trans-impedance mode to operate solely as a light detecting device and being connected to a circuit that applied a reverse bias separate from a driving circuit for the other light-emitting diodes in the array, the trans-impedance mode including a trans-impedance amplifier such implementing enabling the light detecting device to function solely as a detector of characteristics of the semiconductor devices and not an emitter; at least one of the semiconductor devices performs as a thermal diode detector within the array to detect and generate a signal responsive to heat; and a controller configured to control the array responsive, at least in part, to the signal. - View Dependent Claims (5, 6, 7)
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8. An optical system for performing an operation on a work piece, comprising:
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an array of light emitting diodes; at least one of the light emitting diodes in the array electrically connected in a photovoltaic mode to a circuit separate from driving circuitry for other light emitting diodes in the array, causing the at least one of the light emitting diodes to function solely as a detector of one or more selected characteristics of the other light emitting diodes, the detector located in a selected position in the array; and
,a controller configured to control the light emitting diodes capable of emitting light in the particular area of the array according to a signal from at least one of the light emitting diodes connected to function solely as a detector. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification