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Touch sensor system, and electronic device

  • US 9,354,757 B2
  • Filed: 05/08/2012
  • Issued: 05/31/2016
  • Est. Priority Date: 06/27/2011
  • Status: Active Grant
First Claim
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1. A touch sensor system, comprising:

  • a control circuit including;

    a driving section that (a) drives, on a basis of code sequences di (=di1, di2, . . . , diN, where i=1, . . . , M) which are orthogonal to one another and include elements each being either +1 or −

    1 and each of which has a length N, M drive lines in parallel for each of (I) a first capacitance column C1i (i=1, . . . , M) formed between the M drive lines and a first sense line and (II) a second capacitance column C2i (i=1, . . . , M) formed between the M drive lines and a second sense line, so that a voltage +V is applied for an element of +1 in the code sequences and that a voltage −

    V is applied for an element of −

    1 in the code sequences, and thus (b) outputs sFirst =(s11, s12,. . . , s1N) from the first capacitance column and outputs sSecond =(s21, s22, . . . , s2N) from the second capacitance column; and

    an estimation section that estimates, (a) on a basis of a first inner product operation of the outputs sFirst and the code sequences di, a first capacitance value in the first capacitance column which first capacitance value corresponds to a k1-th drive line and (b) on a basis of a second inner product operation of the outputs sSecond and the code sequences di, a second capacitance value in the second capacitance column which second capacitance value corresponds to a k2-th drive line; and

    a sensor panel corresponding to the drive lines, the sense lines, the first capacitance column, and the second capacitance column, the sensor panel including a two-dimensional region including at least one partial region and a remainder region being a region other than the partial region;

    wherein the control circuit,carries out a first process in accordance with a partial region touch signal corresponding to a touch to the partial region; and

    carries out a second process in accordance with a remainder region touch signal corresponding to a touch to the remainder region, the second process being different in kind from the first process,the partial region is a palm placing region that corresponds to a non-input region where a palm is placed during user input to the sensor panel,of the palm placing region and the remainder region, only the palm placing region is arranged to move within the two-dimensional region so as to follow movement of the center of mass of the partial region touch signal which corresponds to where the palm is placed during user input to the sensor panel, andthe remainder region touch signal corresponds to a plot signal generated by a stylus and/or a touch signal generated by a finger.

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