Optical System And Devices

Abstract: Optical System and Devices A touch sensitive apparatus comprises a top plate and a base plate. The top plate has one or more light sources associated with it, such that light from the plurality of light sources is transmitted within the top plate with total internal reflection. The base plate has one or more detectors associated with it for detecting light transmitted within the base plate. The top plate and the base plate are configured such that if an external body touches a first surface of the top plate, then light is coupled from a second surface of the top plate into the base plate through a first surface of the base plate. One or more regions of the first surface, the second surface, or both are provided with a layer inhibiting internal reflection at that region of the surface, thereby providing optical separation between one part of the top plate and another part of the top plate.

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