Auto light intensity adjustment system
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United States of America Patent
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Jun 12, 2012
Grant Date -
Apr 8, 2010
app pub date -
Sep 8, 2009
filing date -
Oct 2, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An auto light intensity adjustment system is provided. The auto light intensity adjustment system includes a light sensing unit, a charge/discharge circuit, a comparator unit and a light source module. The light sensing unit outputs a sensing signal according to an ambient light intensity detected thereby. The charge/discharge circuit is coupled to the light sensing unit for receiving the sensing signal, and generating a voltage signal with regular variation periods according to the sensing signal. The comparator unit compares the voltage signal to a threshold value signal, and outputs a result signal accordingly. The light source module modifies a light intensity according to the result signal. The invention automatically controls the light intensity according to the ambient light intensity.
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