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TOUCH SCREEN CONTROLLER USING DIFFERENTIAL SIGNAL PROCESSING

  • US 20120268397A1
  • Filed: 01/18/2012
  • Published: 10/25/2012
  • Est. Priority Date: 04/19/2011
  • Status: Abandoned Application
First Claim
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1. A touch screen controller using differential signal processing, the touch screen controller comprising:

  • a charge amplifier configured to convert a charge output from a touch panel into a voltage and output a single-ended signal;

    a first variable gain amplifier configured to remove an offset except for touch information existing on a path sensing signal preset for differential processing of the single-ended signal output from the charge amplifier;

    at least one second variable gain amplifier configured to remove an offset between channels while referring to a line signal input to the first variable gain amplifier;

    a channel integrator configured to perform an integration on the signal output from the first and the at least one second variable gain amplifiers from a first channel and returning a common reference to a pixel result; and

    a linearizer configured to perform a linearization by detecting a linearization factor and a phase error of an output signal of the channel integrator.

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