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Automatic calibration of a capacitive touch screen used with a fixed element flat screen display panel

  • US 5,283,559 A
  • Filed: 09/21/1992
  • Issued: 02/01/1994
  • Est. Priority Date: 09/21/1992
  • Status: Expired due to Fees
First Claim
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1. An automatic calibrating touch screen apparatus, for introducing data into a data processing device, said data being indicative of the location of a localized touch applied at a touch situs, comprising:

  • a fixed element display;

    a touch sensitive panel overlaid on said fixed element display, said touch sensitive panel having an electrically conductive coating;

    at least one calibration contact affixed to said touch sensitive panel on said electrically conductive coating;

    means for controlling a translation of a set of touch coordinates to a set of target coordinates utilizing a correction factor;

    means, responsive to said controller means, for selecting at least one of said calibration contacts, and for generating said correction factor;

    a reference, selectable by said selecting means, applied to said calibration contact;

    an insulated wire for each said calibration contact, a first end of said wire terminating at said calibration contact on said touch sensitive panel, a second end of said wire terminating at said selecting means.

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