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METHOD AND DEVICE FOR DETECTING CAPACITIVE TOUCH SCREEN

  • US 20130307814A1
  • Filed: 07/10/2012
  • Published: 11/21/2013
  • Est. Priority Date: 05/18/2012
  • Status: Active Grant
First Claim
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1. A detecting device for a capacitive touch screen, comprising:

  • a storage circuit for storing a plurality of frequency settings based on a level of power consumption, each frequency setting corresponding to a type of driving mode of a type of driving potential, and each frequency setting including a frequency and a set of parameters, wherein there is at least one type of driving potential;

    a driving circuit for providing a driving signal to at least one driving electrode of the capacitive touch screen according to a working frequency, wherein the capacitive touch screen includes a plurality of driving electrodes and a plurality of detecting electrodes crossing each other at a plurality of intersections; and

    a detecting circuit including;

    initializing settings of the detecting circuit based on the set of parameters of one of the frequency settings;

    detecting signals from the detecting electrodes based on a set of parameters of the detecting circuit and generating a 1D sensing information based on the signals from the detecting electrodes;

    determining if noise interference exceeds a tolerable range based on the 1D sensing information; and

    if the noise interference exceeds a tolerable range, including;

    sequentially changing the working frequency and the settings of the detecting circuit based on the frequency and the set of parameters of one of the frequency settings and thereafter generating a 1D sensing information and determining if the noise interference still exceeds the tolerable range based on the 1D sensing information until the noise interference does not exceed the tolerable range;

    orsequentially changing the working frequency and the settings of the detecting circuit based on the frequency and the set of parameters of each of the frequency settings and thereafter generating a 1D sensing information and determining if the noise interference still exceeds the tolerable range based on the 1D sensing information, and changing the working frequency and the settings of the detecting circuit to the frequency and the set of parameters of the frequency setting that has the lowest noise interference.

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