Method and apparatus to measure light intensity
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United States of America Patent
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Nov 5, 2013
Grant Date -
Jun 20, 2013
app pub date -
Dec 14, 2011
filing date -
Dec 14, 2011
priority date (Note) -
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Abstract
A method for controlling a light emitting diode (LED) is provided. Initially, the LED, which had been active, is deactivated, and a voltage for a current that corresponds to the persistence of the LED is generated. The voltage is then integrated so as to generate an integrated voltage, and the integrated voltage is compared to a threshold. When the integrated voltage is less than the threshold, the LED is then activated.
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