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Touch sensor system and electronic device

  • US 9,830,026 B2
  • Filed: 05/08/2012
  • Issued: 11/28/2017
  • Est. Priority Date: 06/29/2011
  • Status: Active Grant
First Claim
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1. A touch sensor system, comprising:

  • a drive section for (a) driving, 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) outputting outputs sFirst=(s11, s12, . . . , s1N) from the first capacitance column and outputs sSecond=(s21, s22, . . . , s2N) from the second capacitance column;

    an estimation section for estimating (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;

    a touch panel which is corresponded to the drive lines, the first sense line, the second sense line, the first capacitance column, and the second capacitance column; and

    a touch invalidating section which, in a case where a specific point of the touch panel is continuously touched one time for at least a predetermined period of time, invalidates an instruction that is given, in accordance with this one time touch, to an electronic device including the touch panel,the touch invalidating section judging whether or not the touch continues for a touch time threshold value which is a period of time corresponding to the predetermined period of time,in a case where the point is continuously touched for the predetermined period of time, the touch invalidating section invalidating an instruction corresponding to a next touch on the point,the touch invalidating section judging that the point is being touched, in a case where a level of a signal indicative of a degree of contact of an object with the point is not less than a touch detection threshold value, which is a standard for the level, or in a case where the level is above the touch detection threshold value, andthe touch invalidating section increasing the touch detection threshold value in a case where the point is continuously touched for at least the predetermined period of time so that the level of the signal of the touch is not more than the touch detection threshold value thus increased, wherein the touch detection threshold is finitely increased by a fixed value by the touch invalidation section and maintained at a finitely increased value even after termination of the continuous touch.

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