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See-through digitizer with clear conductive grid

  • US 5,381,160 A
  • Filed: 10/30/1991
  • Issued: 01/10/1995
  • Est. Priority Date: 09/27/1991
  • Status: Expired due to Term
First Claim
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1. A combined display and cordless electromagnetic digitizing input device for a computer comprising:

  • a) a graphics display panel having a viewing surface and a non-viewing back surface;

    b) a cordless electromagnetic digitizing input device comprising,b1) a first grid of parallel transparent conductors including means for connection to electromagnetic digitizing electronics to sense the location of an electromagnetic stylus in a first axis of a coordinate system associated therewith disposed over said back surface, said first grid of parallel transparent conductors comprising a first flexible transparent substrate carrying a plurality of first transparent indium tin oxide conductors thereon, andb2) a second grid of parallel transparent conductors including means for connection to said electromagnetic digitizing electronics to sense the location of said electromagnetic stylus in a second axis of said coordinate system associated therewith disposed over said first grid of parallel transparent conductors electrically insulated therefrom and perpendicular thereto, said second grid of parallel transparent conductors comprising a second flexible transparent substrate carrying a plurality of second transparent indium tin oxide conductors thereon;

    c) a backlighting panel disposed adjacent said electromagnetic digitizing input device for backlighting said graphics display panel through said electromagnetic digitizing input device; and

    ,d) a sheet of a transparent conductive material connected to ground potential disposed between said electromagnetic digitizing input device and said backlighting panel for shielding the electrostatic interference.

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