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Device and method for detecting touch screen

  • US 8,952,928 B2
  • Filed: 10/12/2012
  • Issued: 02/10/2015
  • Est. Priority Date: 03/19/2008
  • Status: Active Grant
First Claim
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1. A method for operating a touch screen, wherein said touch screen comprising a plurality of first conductive strips arranged parallel in a first direction and a plurality of second conductive strips arranged parallel in a second direction, and at least one external grounded conductive object on said touch screen is detected based on a reference value, said method comprising:

  • (a) performing a one-dimensional (1D) mutual capacitive detection to obtain a first 1D sensing information within a predetermined period of time, wherein said 1D mutual capacitive detection including;

    simultaneously providing a driving signal to all of the first conductive strips;

    detecting mutual capacitive signals of all of the second conductive strips to generate the first 1D sensing information; and

    determining whether at least one external grounded conductive object is touching or approaching the touch screen based on the first 1D sensing information within said predetermined period of time;

    (b) performing a two-dimensional (2D) mutual capacitive detection to obtain a 2D sensing information, said 2D mutual capacitive detection including;

    sequentially providing a driving signal to one or more different conductive strips in the first conductive strips;

    each time one or more different conductive strips in the first conductive strips being provided with the driving signal, detecting the signals of all of the second conductive strips to obtain a 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal generated based on the mutual capacitive signals of all of the second conductive strips; and

    combining each 1D sensing information corresponding to the one or more first conductive strips being provided with the driving signal to generate a 2D sensing information;

    (c) determining a location of the said at least one external grounded conductive object based on said 2D sensing information when said first 1D sensing information indicates that there is the at least one external grounded touching or approaching said touch screen;

    (d) updating said reference values based on said 2D sensing information when said first 1D sensing information indicates that there is no at least one external grounded conductive object touching or approaching said touch screen.

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