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USE OF RESISTIVE TOUCH SCREEN AS A PROXIMITY SENSOR

  • US 20120218210A1
  • Filed: 02/27/2012
  • Published: 08/30/2012
  • Est. Priority Date: 02/28/2011
  • Status: Active Grant
First Claim
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1. A touch screen proximity sensing apparatus comprising:

  • a touch screen comprising a bottom layer and a top layer wherein the top layer and bottom layer are oriented such that they are separate but capable of being temporarily pressed together;

    a control circuit operatively connected to the touch screen;

    a plurality of measurement circuits comprising;

    a first measurement circuit comprising a resistive sensor circuit; and

    a second measurement circuit comprising a proximity capacitance sensor circuit;

    wherein the proximity capacitance sensor detects an object by determining an equivalent capacitance between the touch screen and the object;

    wherein the resistive sensor circuit measures a touch position by measuring a voltage along a voltage gradient on at least one of the top layer and bottom layer; and

    wherein the control circuit selectively connects the touch screen with at least one of the plurality of measurement circuits.

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