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Input sensing circuit and touch panel including the same

  • US 8,994,685 B2
  • Filed: 07/25/2011
  • Issued: 03/31/2015
  • Est. Priority Date: 11/23/2010
  • Status: Active Grant
First Claim
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1. A touch panel comprising:

  • a first substrate on which a plurality of first electrode lines are arranged in parallel;

    a second substrate which is spaced apart from the first substrate and on which a plurality of second electrode lines perpendicular to the first electrode lines are arranged in parallel;

    a dielectric layer interposed between the first substrate and the second substrate;

    a driving unit which applies a driving voltage for driving the dielectric layer to all or a portion of capacitance nodes formed at intersections between the plurality of first electrode lines and the plurality of second electrode lines; and

    a sensing unit which determines whether there is an input on the touch panel, based on a change in capacitance at the capacitance nodes,wherein the sensing unit comprises a charge pump to which an output signal from the intersections between the first electrode lines and the second electrode lines is input as a charge source according to the change in capacitance at the capacitance nodes in response to a sensing signal that is sequentially applied to the first electrode lines, the sensing signal having a sensing voltage different from a driving voltage, andthe sensing unit determines whether there is the input on the touch panel, based on an output voltage of the charge pump.

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