Patent ID: 8184108

Claim:
A method, comprising, providing a waveguide substrate having a substantially flat upper resting surface bounded, at least in part, by a wall that extends above the resting surface, the wall having a inner surface that is adjacent to the resting surface and an outer surface that is on the opposite side of the wall from the inner surface, the substrate further comprising a plurality of waveguides arranged on the outer surface of the wall with each waveguide comprising an optical fold that redirects light in the waveguides at a right angle from an originating direction, and a touch screen arranged on the flat upper resting surface; and wherein said providing of the waveguide substrate comprises providing a substrate having the plurality of waveguides arranged in grooves made on the outer surface of the wall thereby comprising a plurality of embedded waveguides each comprising an optical fold that redirects light in the waveguides at said right angle from an originating direction such that the waveguides perform one of: directing light over the touch screen; and receiving light from adjacent the touch screen and directing it to a light detector that is not located on the flat upper resting surface.