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Simplified touch screen with improved position accuracy

  • US 5,804,773 A
  • Filed: 02/16/1995
  • Issued: 09/08/1998
  • Est. Priority Date: 02/16/1995
  • Status: Expired due to Fees
First Claim
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1. A touch screen system to generate signals representing the x- and y-coordinates of a position contacted thereon, said touch screen system comprising:

  • a resistive surface defined by a first pair of oppositely disposed edges and a second pair of oppositely disposed edges arranged orthogonally with said first pair of edges;

    a set of electrodes electrically in contact with said resistive surface, each electrode of said set of electrodes positioned proximate intersections of said first and second pairs of oppositely disposed edges; and

    means connected to said set of electrodes for repetitively generating, in separate time intervals,a) a transverse voltage gradient between a pair of oppositely-disposed edges of said resistive surface, andb) at least one diagonal voltage gradient between a pair of diagonally-disposed corners of said resistive surface;

    whereby equipotential lines created by said transverse and diagonal voltage gradients throughout said resistive surface intersect in a nearly perpendicular orientation throughout a major portion of said resistive surface.

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