Optical navigation system and detection method thereof adapted for ambient light and liftoff detection
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United States of America Patent
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Sep 12, 2017
Grant Date -
May 28, 2015
app pub date -
Oct 16, 2014
filing date -
Nov 28, 2013
priority date (Note) -
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Abstract
There is provided an optical navigation system including a light source, a first photosensitive unit, a second photosensitive unit, a control unit and a processing unit. The light source is configured to emit light of a predetermined wavelength. The first photosensitive unit is configured to receive reflected light of the predetermined wavelength reflected by a working surface. The second photosensitive unit is covered with a coating to block light of the predetermined wavelength. The control unit is configured to control the light source, the first photosensitive unit and the second photosensitive unit to expose both the first photosensitive unit and the second photosensitive unit when the light source is turned on. The processing unit is configured to read first image data and second image data respectively from the first photosensitive unit and the second photosensitive unit thereby identifying an ambient light mode or a liftoff mode.
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