Touch screen signal processing
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United States of America Patent
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Oct 16, 2012
Grant Date -
Apr 22, 2010
app pub date -
Oct 16, 2009
filing date -
Feb 14, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A touch screen which uses light sources at one or more edges of the screen which directs light across the surface of the screen and at least two cameras having electronic outputs located at the periphery of the screen to receive light from said light sources. A processor receives the outputs of said cameras and employs triangulation techniques to determine the location of an object proximate to said screen. Detecting the presence of an object includes detecting at the cameras the presence or absence of direct light due to the object, using a screen surface as a mirror and detecting at the cameras the presence or absence of reflected light due to an object. The light sources may be modulated to provide a frequency band in the output of the cameras.
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