Multi-user touch screen
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United States of America Patent
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Sep 20, 2011
Grant Date -
Apr 17, 2008
app pub date -
Oct 12, 2006
filing date -
Oct 12, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A multi-user touch-responsive viewing screen is described which uses frustrated total internal reflection in a slab of transparent material to illuminate the contact point between the slab and a finger or other object substantially matching the slab's index of refraction. Light, coupled upon touch, can be detected with a video camera, and used to determine both the position and pressure of the touch. Multiple touches can be accommodated and each touch accurately located. Projected images can be applied to the slab and a diffuser to construct an interactive touch screen.
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Family
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Cited Art Landscape
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