DETECTING HIGH INTENSITY LIGHT IN PHOTO SENSOR
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United States of America Patent
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Feb 21, 2019
app pub date -
May 18, 2018
filing date -
May 18, 2018
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Abstract
Two separate schemes are used for detecting light intensity in low light conditions and high light conditions. In high light conditions, two threshold voltages are set and the time between the crossing of a sensor voltage at the two threshold voltages is measured to determine the light intensity in the high light conditions. In low light conditions, a comparator is used to compare the voltage level of the sensor voltage relative to a reference voltage that increase over time. The time when the reference voltage reaches the sensor voltage level is detected to determine the light intensity in the low light conditions.
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