Light detecting device
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United States of America Patent
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Issued Date -
Apr 26, 2007
app pub date -
Oct 3, 2005
filing date -
Oct 3, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The present invention is a light detecting device with compensation capacity. The light detecting device includes a light detector, a converter, a compensation circuit, a subtraction circuit, and an amplifier. The light detector can sense ambient light, generate a current signal indicative of the ambient light, and deliver the current signal to the converter. The converter can transform the current signal into a first voltage signal. The compensation circuit includes a shielded photodiode and a resistor and generates a suitable second voltage signal. The subtraction circuit can subtract the second voltage signal from the first voltage signal and produce a current signal that is solely dependent on the ambient light. The amplifier can amplify the current signal and produce a larger current signal to external loads.
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