Touch-sensitive display devices
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United States of America Patent
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Dec 20, 2016
Grant Date -
Aug 21, 2014
app pub date -
Jun 15, 2012
filing date -
Jun 16, 2011
priority date (Note) -
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Abstract
We describe a touch sensitive image display device including: an image projector to project a displayed image onto a surface; a touch sensor light source to project a plane of light above the displayed image; a camera to capture a touch sense image from light scattered from the plane of light by an approaching object; and a signal processor to process the touch sense image to identify a location of the object. The touch sensor light source is amplitude modulated, and signal processor is further configured to process a plurality of the touch sense images captured when the touch sensor light source is off to compensate for ambient light in a touch sense image captured when the touch sensor light source is on.
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