OPTICAL DETECTION APPARATUS AND METHOD
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United States of America Patent
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Issued Date -
Sep 30, 2010
app pub date -
Nov 6, 2009
filing date -
Mar 31, 2009
priority date (Note) -
Abandoned
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Abstract
An optical detection apparatus includes a scanning device, a sensor, and a distinguishing module. The scanning device is positioned to scan a detection region with a scan light beam, in which the incident angle of the scan light beam varies with time. The sensor is positioned to sense a plurality of reflected scan light beams respectively generated by a plurality of actual touches within the detection region. The distinguishing module is operative to distinguish the actual touches from a plurality of ghost touches according to time signals upon which the plurality of reflected scan light beams are sensed by the sensor.
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