Abstract: An optical touch screen, suitable for use underwater and in air comprises a transparent waveguide covering an optional display, which is surrounded by light sources that couple light into the waveguide and sensors that monitor the intensity of light propagating through the waveguide, where light intensity responses are attenuated when the touch surface of the waveguide is touched, as result of disturbing (or frustrating) internally reflected light, and where the locations of such touch events are determined using line equations. The optical touch screen system implements various techniques to allow housing in a waterproof case, and seamless, reliable function underwater and in air.

Abstract: An optical touch screen, suitable for use underwater and in air comprises a transparent waveguide covering an optional display, which is surrounded by light sources that couple light into the waveguide and sensors that monitor the intensity of light propagating through the waveguide, where light intensity responses are attenuated when the touch surface of the waveguide is touched, as result of disturbing (or frustrating) internally reflected light, and where the locations of such touch events are determined using line equations. The optical touch screen system implements various techniques to allow housing in a waterproof case, and seamless, reliable function underwater and in air.