Projection systems for touch input devices
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United States of America Patent
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Aug 19, 2014
Grant Date -
Jan 31, 2013
app pub date -
Sep 22, 2010
filing date -
Sep 22, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In infrared touch input devices that detect and locate a touch object from the blocking of light paths propagating along the X,Y axes, an ambiguity arises when two touch objects are present. This ambiguity can be resolved by the provision of additional light paths angled to the X,Y axes. The present invention provides projection systems that include a light splitting element for splitting collimated sheet of light into two or more sets of beam paths, thereby providing the additional light paths for resolving the double touch ambiguity. In preferred embodiments the light splitting element is in the form of a prism film.
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