An optical input device comprising at least one optically clear plate (56) having at least one light source (7) positioned at a peripheral edge thereof arranged and configured to transmit frequency modulated light into said optically clear plate (56) along its planar length at an angle such that said modulated light...

A touch sensitive apparatus comprises: a top plate having one or more light sources associated therewith, such that light from the one or more light sources is transmitted within the top plate with total internal reflection; a base plate, wherein light is transmissible within the base plate, wherein the base plate c...

A touch sensitive apparatus comprises: a top plate comprising a plurality of touch detection regions, and having one or more light sources associated therewith, such that light from the one or more light sources is transmitted within the top plate with total internal reflection; a plurality of detectors for detectin...