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Display device with touch panel

  • US 20090009486A1
  • Filed: 06/06/2008
  • Published: 01/08/2009
  • Est. Priority Date: 07/03/2007
  • Status: Active Grant
First Claim
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1. A display device with touch panel comprising:

  • a display panel; and

    an electrostatic capacitance coupling type touch panel arranged on a surface on an observer side of the display panel,the touch panel including;

    plural first electrodes extending in a first direction;

    plural second electrodes extending in a second direction different from the first direction;

    a driving circuit;

    a detection circuit; and

    a coordinate-position calculating circuit that calculates a touch position on the touch panel touched by the observer, whereinthe driving circuit sequentially selects two first electrodes out of the plural first electrodes, supplies a high potential voltage higher than a reference voltage to one of the selected two first electrodes, and supplies the reference voltage to the other,the detection circuit selects at least one second electrode out of the plural second electrodes and detects a capacitance difference (A-B) between a capacitor A between the selected second electrode and the first electrode to which the high potential voltage is supplied and a capacitor B between the selected second electrode and the first electrode to which the reference voltage is supplied, andthe coordinate-position calculating circuit calculates a touch position on the touch panel touched by the observer on the basis of positions of the selected first and second electrodes and the capacitance difference (A-B).

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