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User identification for multi-user touch screens

  • US 8,970,502 B2
  • Filed: 05/08/2007
  • Issued: 03/03/2015
  • Est. Priority Date: 05/26/2006
  • Status: Active Grant
First Claim
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1. A multi-user touch screen system, comprising:

  • a touch screen, including,a transparent and electrically conductive surface configured to receive touches from users of the touch screen system;

    touch sensitive elements configured to detect a touch on said transparent and electrically conductive surface to generate a touch signal; and

    at least one control unit connected to said touch sensitive elements and configured to detect a position of the touch based on the touch signal; and

    a touch identification system, including,at least two electrodes;

    a plurality of transmitting units configured to transmit a plurality of unique identifying signals, each of the at least two electrodes being associated with one of the plurality of transmitting units; and

    a receiving unit connected to the transparent and electrically conductive surface and configured to detect said unique identifying signals and said touch signal,wherein said transmitting units and said receiving unit are arranged with respect to said electrically conductive surface and said at least two electrodes so that said receiving unit detects said unique identifying signals from said transmitting units when a user simultaneously touches the electrically conductive surface and one of the at least two electrodes, andwherein the receiving unit is configured to receive the unique identifying signals as signals separate from the touch signal.

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