Touch sensitive flat panel display

  • US 5,777,596 A
  • Filed: 11/13/1995
  • Issued: 07/07/1998
  • Est. Priority Date: 11/13/1995
  • Status: Expired due to Term
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First Claim
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1. A touch sensitive liquid crystal display (LCD) system comprising:

  • a plurality of LCD elements, each of said elements having a corresponding charge time which changes when an external touch is applied to said element by a user;

    means for selectively applying a charge to each of said LCD elements in said plurality;

    means for monitoring a voltage across each of said LCD elements in said plurality and for using said voltage to compare said charge time of each of said LCD elements to a reference charge time value; and

    means, responsive to said means for monitoring, for determining which, if any, of said LCD elements in said plurality are currently being touched by a user, based on said comparison.

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