Illumination device and method controlling the same
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United States of America Patent
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Jun 18, 2013
Grant Date -
Mar 15, 2012
app pub date -
Aug 24, 2011
filing date -
Sep 14, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
An illumination device and a method controlling the same are provided. The illumination device produces a pulse width modulation signal to control an illumination light source of the illumination device. The illumination light source is used to illuminate an environment. A driver of the illumination device provides a current to the illumination light source so the illumination light source emits light and a light detecting element of the illumination device detects a first brightness in the environment when the pulse width modulation signal is at high potential. The driver stops providing the current to the illumination light source and the light detecting element detects a second brightness in the environment when the pulse width modulation signal is at low potential. Thus, through a single light detecting element, two different levels of brightness in the illuminated environment are detected.
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