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DISPLAY DEVICE WITH TOUCH PANEL

  • US 20090315857A1
  • Filed: 06/17/2009
  • Published: 12/24/2009
  • Est. Priority Date: 06/19/2008
  • Status: Abandoned Application
First Claim
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1. A display device with a touch panel, comprising:

  • a substrate which includes a planar transparent conductive film formed on an observer side thereof, the transparent conductive film being used as a transparent electrode of a capacitive touch panel, and being shaped to have four corners;

    four detection circuits each of which is provided in one of the four corners of the transparent conductive film to detect a voltage that is output from each corner of the transparent conductive film after a position detection voltage is supplied to the corner of the transparent conductive film; and

    a coordinate position arithmetic circuit to which voltages detected by the four detection circuits are input,wherein each of the four detection circuits includes;

    a detection switch which supplies the position detection voltage to the corner of the transparent conductive film where its own detection circuit is provided; and

    an integration circuit which integrates a current that flows in the corner of the transparent conductive film where its own detection circuit is provided after the detection switch is switched off, andwherein, based on voltages integrated by the four integration circuits, the coordinate position arithmetic circuit calculates which point on the transparent conductive film has been touched with one of a finger of an observer or a pen held by the observer.

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