US Patent 7868778 Apparatus and method for proximity-responsive display materials

Apparatus and a method for causing a printed display (poster, placard or promotional flier) to become interactive when a person points to part of the display. Behind the display a customized layout of capacitive proximity sensors printed with conductive inks on to a low-cost disposable, replaceable substrate (paper, plastic, cardboard) in alignment with visually significant features of the display is connected to proximity-sensing circuitry. Audio-visual or multimedia responses using pre-recorded or synthesized information are reproduced in event of a selection.