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Pointer detection apparatus and pointer detection method

  • US 8,896,547 B2
  • Filed: 03/30/2010
  • Issued: 11/25/2014
  • Est. Priority Date: 06/18/2009
  • Status: Active Grant
First Claim
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1. A pointer detection apparatus, comprising:

  • a conductor pattern including N number of first conductors numbered from 0 to {N−

    1} disposed in a first direction and a plurality of second conductors disposed in a second direction which crosses the first direction;

    a multi-frequency signal production circuit configured to produce a plurality of signals of different frequencies;

    a first conductor selection circuit configured to selectively supply said signals of different frequencies produced by said multi-frequency signal production circuit, simultaneously, only to those first conductors Yn through Y{n+s} which are directly adjacent to each other,wherein, when {n+s+1}≦

    {N−

    1} or {n−

    1}≧

    0, simultaneously supplying, after a defined time interval, said signals of different frequencies only to those first conductors Y{n+1} through Y{n+s+1} or Y{n−

    1} through Y{n+s−

    1},wherein, when {n+s+1}>

    {N−

    1} or {n−

    1}<

    0, looping around to Y{0} instead of Y{n+s+1} or looping around to Y{N−

    1} instead of Y{n−

    1},wherein n is an integer and 0≦

    n≦

    {N−

    1}, andwherein (s+1) is a total number of the first conductors to which said signals of different frequencies are simultaneously supplied;

    a second conductor selection circuit configured to selectively receive detection signals from the plurality of second conductors; and

    a signal detection circuit configured to detect signals of individual frequencies, corresponding to the signals of different frequencies produced by said multi-frequency signal production circuit, which are representative of coupling states at cross points between the first conductors and the second conductors, and are received from said second conductor selection circuit.

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