Patent ID: 9668314
Date: 2017-05-30
CPC Classifications: F21K,F21V,F21Y,H05B

Claim:
1. An illumination device, comprising a plurality of emitter modules spaced apart from each other and arranged in a line, wherein each emitter module comprises: a plurality of light emitting diodes (LEDs), which are arranged in a two-dimensional array, mounted on a substrate and encapsulated within a dome, wherein one or more of the plurality of LEDs is configured to emit light at a shorter wavelength than the other LEDs; a detector configured to detect light emitted from the plurality of LEDs, wherein the detector is also mounted on the substrate and encapsulated within the dome, and wherein the detector is positioned on a side or near a corner of the array that is furthest from the one or more LEDs configured to emit light at the shorter wavelength; a plurality of driver circuits coupled to the plurality of LEDs for supplying drive currents thereto, wherein during a compensation period, the plurality of driver circuits are configured to supply drive currents to the plurality of LEDs, one LED at a time, so that the detector is configured to detect the light emitted by each individual LED; a receiver coupled to the detector for monitoring the light emitted by each individual LED and detected by the detector during the compensation period; and control logic coupled between the receiver and the driver circuits, wherein the control logic is configured to control the drive currents produced by driver circuits, so as to adjust an intensity of the light emitted by each individual LED.