An improved tablet system is disclosed of the type having an array of X dimension wires and Y dimension wires that are capacitively coupled to a pen that a user holds to the tablet to produce a position signal. The X and Y wires are individually coupled to drivers so that the wires on one side of the...http://www.google.com.au/patents/US3999012?utm_source=gb-gplus-sharePatent US3999012 - Graphic entry tablet with improved addressing
