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In-cell multi-touch display panel system

  • US 9,690,424 B2
  • Filed: 10/13/2016
  • Issued: 06/27/2017
  • Est. Priority Date: 11/14/2012
  • Status: Active Grant
First Claim
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1. An in-cell multi-touch display panel system, comprising:

  • a touch liquid crystal display panel including;

    a thin film transistor layer having K gate driving lines, L source driving lines, and a plurality of thin film transistors, where K and L are each a positive integer;

    a touch-sensing structure comprising;

    a detection electrode layer having a plurality of touch-control transistors, M first conductor lines and a plurality of auxiliary detection electrode areas, wherein the M first conductor lines and the auxiliary detection electrode areas are independently or dependently used for touch detection, where M is a positive integer; and

    a common-voltage and touch-driving layer having N second conductor lines for receiving a common voltage signal in display operation and receiving a touch driving signal in touch detection, where N is a positive integer and K >

    N, wherein the auxiliary detection electrode areas are respectively configured at intersections of the first conductor lines and the second conductor lines in the detection electrode layer, each first conductor line is connected to N auxiliary detection electrode areas via N touch-control transistors, and the M×

    N touch-control transistors are divided into N sets corresponding to the N second conductor lines, respectively, wherein the detection electrode layer and the common-voltage and touch-driving layer are on the same side of the thin film transistor layer, and the N second conduct lines are intersected with the M first conduct lines; and

    a touch display control subsystem, connected to the thin film transistor layer, the detection electrode layer, and the common-voltage and touch-driving layer, for providing display driving signal sequentially to the K gate driving lines and turning on the corresponding thin film transistors, providing display pixel signal to the L source driving lines for performing display operation, and providing the touch driving signal to the N second conductor lines and sampling detection voltages from the M first conductor lines to detect whether there is an external object approached;

    wherein the K gate driving lines are divided into N sets corresponding to the N second conductor lines respectively, and when one set of gate driving lines has the display driving signal, the second conductor line corresponding to the set of gate driving lines is connected to the common voltage, and wherein the touch display control subsystem does not provide the touch driving signal to the i-th second conductor line when the display driving signal is provided to one set of gate driving lines corresponding to the i-th second conductor line, where i is an positive integer and 2≦

    i≦

    N, provides the touch driving signal to the i-th second conductor line and M first conductor lines and turns on the i-th set of touch-control transistors corresponding to the i-th second conductor line in a display period when the display driving signal is not provided to one set of gate driving lines corresponding to the i-th second conductor line, and provides the touch driving signal to the (i-1)-th second conductor line and the display driving signal to the i-th set of gate driving lines corresponding to the i-th second conductor line at the same time for simultaneously performing display operation and touch detection.

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