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Integrated active matrix touch panel

  • US 10,359,874 B2
  • Filed: 09/29/2016
  • Issued: 07/23/2019
  • Est. Priority Date: 10/02/2015
  • Status: Active Grant
First Claim
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1. An integrated touchscreen operable in either one of a self-capacitance touch sensing mode and a mutual-capacitance touch sensing mode and comprising a plurality of display pixels arranged in a two-dimensional matrix of rows and columns, each pixel row having an associated display control line and each pixel column having an associated display data line, each pixel including a pixel electrode, a common electrode and a display control switch for selectively connecting the pixel electrode to the display data line associated with the pixel, the display control switch having a control terminal connected to the display control line associated with the pixel;

  • wherein a matrix of touch elements is defined in the display pixels, a touch element encompassing an n×

    m group of touch unit cells, each unit cell composed of an k×

    j group of display pixels where k denotes the number of rows of pixels and j denotes the number of columns of pixels;

    wherein the common electrodes of the display pixels encompassed in the touch unit cell are electrically connected together to form a common electrode for the touch unit cell;

    wherein the common electrodes of the unit cells encompassed in the touch element form a common electrode for the touch element;

    wherein the touch unit cell includes a conductive lines extending in the row direction and b conductive lines extending in the column direction, where a≤

    k and b≤

    j and at least one of a and b is non-zero;

    wherein each of the (a+b) conductive lines of a unit cell encompassed by a touch element is connected to the respective conductive line of other units cells encompassed by the touch element;

    wherein a touch unit cell includes two switching arrangements, one for selectively connecting the common electrode of the touch unit cell to a first touch data line and the other for selectively connecting the common electrode of the touch unit cell to a second touch data line;

    and wherein the touchscreen comprises a controller adapted to operate in either one of a self-capacitance touch sensing mode in which, for at least one touch element, the controller applies an excitation voltage to the common electrode of the touch element and senses a signal generated by the touch element and a mutual-capacitance touch sensing mode in which the controller applies an excitation voltage to the common electrode of at least one touch element and determines a signal generated in at least another touch element of the matrix of touch elements.

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