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Touch detector and method of driving the same, display with touch detection function, and electronic unit having plural different drive electrodes

  • US 9,746,956 B2
  • Filed: 08/11/2016
  • Issued: 08/29/2017
  • Est. Priority Date: 09/24/2010
  • Status: Active Grant
First Claim
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1. A touch detector comprising:

  • a plurality of drive electrodes arranged side by side to extend in a first direction;

    a detection electrode extending in a second direction orthogonal to the first direction, and arranged to form a capacitance at each of intersections with the drive electrodes; and

    a scanning drive section sequentially selecting a plurality of target electrodes from the drive electrodes in a time-divisional manner, and applying a touch detection drive signal with a plurality of pulse waveforms for detecting an external object to the selected target electrodes to perform a scanning drive, whereina scanning pitch in the scanning drive and a total width of the selected target electrodes are set independently of one another, such that;

    to increase a position resolution when a touched position is detected, the total width of the selected target electrodes is fixed, and the scanning pitch is set to be smaller than the total width of the selected target electrodes, andto increase a detection sensitivity to a touch, the scanning pitch is fixed, and the total width of the selected target electrodes is increased in a range in which the scanning pitch is smaller than the total width of the selected target electrodes,the scanning drive section sequentially selects the target electrodes by shifting the drive area by the scanning pitch so that the shifted drive area includes a part of the most recently selected target electrodes,the drive electrodes include a predetermined number of kinds of drive electrodes,the predetermined number of kinds of drive electrodes are alternatingly arranged side by side, andin the scanning drive, while the touch detection drive signal is simultaneously applied to one target electrode in addition to the predetermined number of target electrodes selected from the predetermined number of kinds of drive electrodes which are alternatingly arranged side by side, scanning is performed to shift the target electrodes by the predetermined number of target electrodes at a time.

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