Patent ID: 7608815
Filing Date: 2009-10-27
Classification: H01L

Abstract:
1. A photo sensor with compensation comprising: a photo cell for providing a first signal indicative of a light level; an environmental sensor configured to provide a second signal indicative of an environmental parameter; and a processor responsive to the first signal and the second signal and configured to provide a compensated signal that is indicative of an absolute light level; wherein the processor is further configured to determine the compensated signal based at least on one or more of the first signal and the second signal and wherein the processor adjusts the first signal to account for a sensitivity of the photo cell relative to the light level to provide the compensated signal; and wherein the processor adjusts the first signal in accordance with a light calibration coefficient and a calibration constant associated respectively with the slope and intercept of a line relating the first signal and the light level when the second signal is constant.