Touch display device

Patent metadata

Field	Value
Publication number	US-12455644-B2
Application number	US-202318475953-A
Country	US
Kind code	B2
Filing date	Sep 27, 2023
Priority date	Jan 27, 2023
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

Embodiments of the disclosure may insert a break period when the gate line is not driven, such as a blank period, of an active period of a frame period and perform touch sensing, driven in the same manner as touch sensing driven in the blank period, in the break period, thereby reducing the influence of display driving on touch sensing and enhancing touch sensing performance.

First claim

The invention claimed is:

1 . A touch display device, comprising:
a first gate driving circuit configured to drive a first group of gate lines disposed on a display panel; a second gate driving circuit configured to drive a second group of gate lines distinct from the first group; and a touch driving circuit, wherein display driving of the touch display device is performed based on frame periods, and one frame period comprises a first active period, a second active period, a break period between the first and second active periods, and a blank period following the second active period, wherein the touch driving circuit configured to: drive a plurality of touch electrodes disposed on the display panel according to a first touch mode in a first period corresponding to the first active period when the first group of gate lines are driven and in a second period corresponding to the second active period when the second group of gate lines are driven; and drive the plurality of touch electrodes according to a second touch mode during the break period between the first period and the second period, wherein the break period between the first and second active periods included in the one frame period includes a first sub sensing period and a second sub sensing period following the first sub sensing period, and a touch driving signal provided during the first sub sensing period is different from a touch driving signal provided during the second sub sensing period, and wherein the touch driving signal provided during the first sub sensing period includes a plurality of pulses each having a first voltage level and a second voltage level greater than the first voltage level, and the touch driving signal provided during the second sub sensing period has a constant voltage greater than the first voltage level.

2 . The touch display device of claim 1 , wherein at least two of the first group of gate lines are concurrently driven in the first period, and at least two of the second group of gate lines are concurrently driven in the second period.

3 . The touch display device of claim 1 , wherein at least two of the first group of gate lines are electrically connected with each other, and at least two of the second group of gate lines are electrically connected with each other, and wherein each of the first group of gate lines is alternately disposed with each of the second group of gate lines.

4 . The touch display device of claim 1 , wherein the first gate driving circuit is configured to receive a first gate start pulse to operate, and the second gate driving circuit is configured to receive a second gate start pulse to operate, and
wherein the second gate start pulse is input at a different time from a time when the first gate start pulse is input.

5 . The touch display device of claim 1 , wherein a first interval is present between when a last gate line of the first group of gate lines is driven and when a first gate line of the second group of gate lines is driven, and
wherein a second interval is present between when a last gate line of the second group of gate lines is driven and when a first gate line of the first group of gate lines is driven.

6 . The touch display device of claim 5 , wherein a duration of the first interval is the same as a duration of the second interval.

7 . The touch display device of claim 5 , wherein all of the plurality of touch electrodes are driven according to the second touch mode during at least a partial period of the first interval, and all of the plurality of touch electrodes are driven according to the second touch mode during at least a partial period of the second interval.

8 . The touch display device of claim 1 , wherein in the first touch mode, among the plurality of touch electrodes, a first touch electrode operates as a touch driving electrode, and a second touch electrode operates as a touch sensing electrode, and
wherein in the second touch mode, the first touch electrode and the second touch electrode operate as the touch driving electrode in a partial period and operate as the touch sensing electrode in a remaining period.

9 . The touch display device of claim 8 , wherein in the first touch mode, a first touch driving signal is supplied to the first touch electrode and, in the second touch mode, a second touch driving signal is supplied to the first touch electrode and the second touch electrode, and wherein an amplitude of the second touch driving signal is larger than an amplitude of the first touch driving signal.

10 . The touch display device of claim 8 , wherein a period when the first touch electrode operates as the touch driving electrode in the second touch mode is distinct from a period when the second touch electrode operates as the touch driving electrode.

11 . A touch display device, comprising:
a plurality of touch electrodes disposed on a display panel; a touch driving circuit configured to: drive a first group of the plurality of touch electrodes according to a first touch mode in a first period, drive a second group of the plurality of touch electrodes according to the first touch mode in a second period, and drive all of the plurality of touch electrodes including the first and second groups according to a second touch mode during a time period between the first period and the second period; and a gate driving circuit, wherein display driving of the touch display device is performed based on frame periods, and one frame period comprises a first active period, a second active period, a break period between the first and second active periods, and a blank period following the second active period, wherein the gate driving circuit configured to: drive a first group of a plurality of gate lines disposed on the display panel in the first period corresponds to the first active period prior to the break period, drive a second group of the plurality of gate lines in the second period corresponds to the second active period following the break period, and not drive the plurality of gate lines including the first and second groups between the first period and the second period corresponds to the break period, wherein the break period between the first and second active periods included in the one frame period includes a first sub sensing period and a second sub sensing period following the first sub sensing period, and a touch driving signal provided during the first sub sensing period is different from a touch driving signal provided during the second sub sensing period, and wherein the touch driving signal provided during the first sub sensing period includes a plurality of pulses each having a first voltage level and a second voltage level greater than the first voltage level, and the touch driving signal provided during the second sub sensing period has a constant voltage greater than the first voltage level.

12 . The touch display device of claim 11 , wherein an interval between the first period and the second period is the same as a length of the blank period.

13 . The touch display device of claim 11 , wherein at least two of the plurality of gate lines are concurrently driven in each of the first period and the second period.

14 . The touch display device of claim 11 , wherein the first group of the plurality of gate lines includes a shared gate line that is electrically connected to at least two gate lines arranged in a different row of the display panel, and wherein the second group of the plurality of gate lines includes a shared gate line that is electrically connected to at least two gate lines arranged in a different row of the dis

Assignees

• Lg Display Co Ltd

Inventors

• Kim Sangkyu
• Shin Seungrok
• Lee Deuksu
• Jang Yoonnara
• Lee Jeonghoon

Classifications

• G06F3/04164 Primary

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title

• G06F3/046

  by electromagnetic means · CPC title

• G06F3/03

  Arrangements for converting the position or the displacement of a member into a coded form · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title