×

In-cell touch type liquid crystal display device and method for driving the same

  • US 10,429,967 B2
  • Filed: 12/27/2012
  • Issued: 10/01/2019
  • Est. Priority Date: 05/24/2012
  • Status: Active Grant
First Claim
Patent Images

1. An in-cell touch type liquid crystal display (LCD) device, comprising:

  • an LCD panel including;

    a first touch block including;

    a first set of gate lines; and

    a first set of common lines; and

    a second touch block including;

    a second set of gate lines; and

    a second set of common lines;

    a gate driver for sequentially applying a high-potential gate driving signal to the first set of gate lines of the first touch block and the second set of gate lines of the second touch block for a single horizontal time period;

    a common voltage generator for concurrently supplying common voltages (Vcom) of;

    a first waveform to all the first set of common lines and the second set of common lines for a display time period during which an image is displayed by the LCD panel; and

    a second waveform to the second set of common lines of the second touch block rather than the first touch block to which the high-potential gate driving signal is being currently applied through the first set of gate lines for detecting a touch input for a touch time period less than the single horizontal time period; and

    a touch detection circuit for detecting a touched position on the liquid crystal (LC) panel through the second waveform common voltages,wherein the first waveform common voltage is a direct current (DC) common voltage corresponding to a pixel voltage of a pixel provided at the LC panel,wherein the second waveform common voltage is an alternating current (AC) common voltage including multiple repetitive square waveforms within the touch time period,wherein, within the single horizontal period, the high-potential gate driving signal partially overlaps and precedes the second waveform common voltage, andwherein the second waveform common voltage swings at constant intervals.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×