Touch screen device and method for driving the same

  • US 9,891,762 B2
  • Filed: 08/29/2014
  • Issued: 02/13/2018
  • Est. Priority Date: 08/30/2013
  • Status: Active Grant
First Claim
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1. A touch screen device, comprising:

  • a touch screen panel including a plurality of Tx lines, a plurality of Rx lines, and touch sensors formed at crossings of the Tx lines and Rx lines;

    a Tx driving circuit that supplies a driving pulse to the Tx lines; and

    an Rx driving circuit that samples charge variations of the touch sensors, which are received through the Rx lines, and converts the received charge variations into touch raw data,wherein the Rx driving circuit includes;

    a biquad bandpass noise filter that includes at least one input terminal connected to at least one of the Rx lines and at least one output terminal, and that removes noise of signals received from the at least one of the Rx lines;

    an integrator that is connected to the at least one output terminal and that accumulates the charge variations passing through the biquad bandpass noise filter to obtain an accumulated charge variation;

    a sampling circuit that samples the accumulated charge variation output from of the integrator to obtain a sampled charge variation; and

    an analog to digital converter that converts the sampled charge variation sampled by and output from the sampling circuit into the touch raw data,wherein the biquad bandpass noise filter includes variable resistors and variable capacitors connected in parallel for center frequency and bandwidth adjustments,wherein the biquad bandpass filter includes;

    a first input terminal connected to a (k)th (k is a natural number) Rx line;

    a second input terminal connected to a (k+1)th Rx line.

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