Sensor arrangement having a capacitive light sensing circuit
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United States of America Patent
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Issued Date -
Dec 18, 2003
app pub date -
Apr 4, 2003
filing date -
Jan 30, 2002
priority date (Note) -
Abandoned
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Abstract
A system for detecting light intensity including a light sensor for sensing light intensity having a capacitance which varies based on light intensity. The light sensor includes first and second layers forming first and second electrodes and a photosensitive dielectric layer disposed between the first and second electrodes. The photosensitive dielectric layer has a dielectric constant that varies with light intensity such that the sensor has a capacitance representative of light intensity. A controller in communication with the sensor measures the capacitance of the sensor, compares the measured capacitance values to stored capacitance values and generates an output signal based on the comparison. The output signal is configured for use in providing an indication of light intensity.
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