Method and apparatus for detecting a multitouch event in an optical touch-sensitive device
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United States of America Patent
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May 10, 2016
Grant Date -
Jul 31, 2014
app pub date -
Mar 21, 2014
filing date -
Aug 7, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A touch sensitive optical control device comprising a set of light emitters 14, 22 and light detectors 18, 24 arranged relative to a touchable surface 30 such that light transmitted by the emitters is received by the detectors along multiple intersecting beams which pass transversely of the surface and touching the surface at a beam interrupts the light transmitted along the beam. Candidate touch points T1, T2, F1, F2 are defined at the intersections of interrupted beams and are confirmed or not as actual touch points by examining test beams 40, 42, 54, 56 near to or coincident with the candidate touch point.
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