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Display device including touch panel device, and coupling-noise eliminating method

  • US 9,535,526 B2
  • Filed: 02/11/2015
  • Issued: 01/03/2017
  • Est. Priority Date: 09/08/2009
  • Status: Active Grant
First Claim
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1. A display device comprising:

  • a touch panel device comprising;

    a touch panel; and

    a touch controller connected to the touch panel, the touch controller comprising;

    a noise removing unit which removes a coupling noise from a sensing output signal input thereto from the touch panel and which outputs a noise-free sensing output signal;

    a sampling unit which samples the noise-free sensing output signal to generate a sampled signal; and

    an analog/digital converter which converts the sampled signal to generate contact information; and

    a display panel device comprising;

    a display panel;

    a gate driver which applies a gate signal to the display panel; and

    a data driver which applies a data voltage to the display panel,wherein the noise removing unit receives a reference noise signal from the touch panel and generates the noise-free sensing output signal by subtracting the reference noise signal from the sensing output signal, whereinthe touch panel is disposed substantially opposite to the display panel,the touch panel includes a touch region for sensing a touch and a reference noise extracting region electrically separated from the touch region,the touch region includes a first electrode which outputs the sensing output signal, andthe reference noise extracting region includes a second electrode which receives a reference voltage including about 0 V and which outputs the reference noise signal to the touch controller, and whereinthe touch region includes a plurality of x-axis electrodes and a plurality of y-axis electrodes insulated from and disposed substantially perpendicular to the plurality of x-axis electrodes,the sensing output signal is output from a first x-axis electrode of the plurality of x-axis electrodes and a first y-axis electrode of the plurality of y-axis electrodes that correspond to a touch point of the touch panel, andthe reference noise signal is output from at least one of the plurality of x-axis electrodes except the first x-axis electrode and at least one of the plurality of y-axis electrodes except the first y-axis electrode.

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