US-20260126869-A1 - TOUCH DISPLAY DEVICE

US20260126869A1US 20260126869 A1US20260126869 A1US 20260126869A1US-20260126869-A1

Abstract

The disclosure discloses a touch display device includes, at a display panel including a display area and a non-display area surrounding the display area, a plurality of X-touch electrode lines extending in a first direction and receiving a touch driving signal, a plurality of Y-touch electrode lines extending in a second direction and transmitting a touch sensing signal, a plurality of X-touch lines extending in the second direction and transmitting the touch driving signal, at least one pseudo-touch routing line disposed at an outermost portion of the display panel, and at least one pseudo-touch electrode line extending from the at least one pseudo-touch routing line.

Inventors

Je Hyung PARK
Da Yeong LEE

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20251125
Priority Date: 20211209

Claims (20)

1 . A touch display device comprising: a display panel including a display area and a non-display area adjacent to the display area, the display area including a plurality of pixels; an encapsulation layer at the display area and the non-display area, the encapsulation layer on the plurality of pixels; and a touch layer on the encapsulation layer, wherein the touch layer comprises a plurality of touch electrodes overlapping the display area and at least one pseudo-touch electrode in the non-display area, wherein the plurality of touch electrodes comprises a first X-touch electrode and a second X-touch electrode disposed in a first row along a first direction, a first X-touch line and a second X-touch line disposed along a second direction, and a first Y-touch electrode line along the second direction, wherein the second direction is different from the first direction, and wherein the first Y-touch electrode line is disposed between the first X-touch electrode and the second X-touch electrode.
2 . The touch display device of claim 1 , wherein the first X-touch electrode and the second X-touch electrode are interconnected in the first direction by a first X-touch electrode connection line.
3 . The touch display device of claim 1 , wherein the first X-touch electrode connection line crosses the first Y-touch electrode line.
4 . The touch display device of claim 1 , wherein the first X-touch line and the second X-touch line are spaced apart from each other in the first direction.
5 . The touch display device of claim 1 , wherein the first X-touch line and the second X-touch line are spaced apart from each other in the second direction.
6 . The touch display device of claim 5 , wherein the first X-touch line overlaps with the first X-touch electrode and the second X-touch line is disposed outside the first X-touch electrode.
7 . The touch display device of claim 4 , further comprising a third X-touch electrode and a fourth X-touch electrode in a second row along the second direction, wherein the first Y-touch electrode line extends to a region between the third X-touch electrode and the fourth X-touch electrode.
8 . The touch display device of claim 7 , wherein the first X-touch line and the second X-touch line cross the third X-touch electrode, wherein the first X-touch electrode is connected to the first X-touch line, and wherein the third X-touch electrode is connected to the second X-touch line.
9 . The touch display device of claim 7 , wherein the first X-touch line crosses the third X-touch electrode and is not connected to the third X-touch electrode.
10 . The touch display device of claim 7 , wherein the first X-touch line has a shifted structure between the first row and the second row, and in the shifted structure, the first X-touch line is shifted in a direction away from the first Y-touch electrode line.
11 . The touch display device of claim 7 , wherein a distance between the first X-touch line and the first Y-touch electrode line in the first row is the same as a distance between the second X-touch line and the first Y-touch electrode line in the second row.
12 . The touch display device of claim 1 , further comprising a touch buffer layer on the encapsulation layer, wherein the first and second X-touch electrodes, the first and second X-touch lines, and the first Y-touch electrode line are disposed on the touch buffer layer.
13 . The touch display device of claim 1 , further comprising a touch protective layer over the first and second X-touch electrodes, the first and second X-touch lines, and the first Y-touch electrode line.
14 . The touch display device of claim 13 , wherein the touch protective layer exposes at least one dam disposed in the non-display area.
15 . The touch display device of claim 1 , wherein the at least one pseudo-touch electrode is disposed outside of the encapsulation layer.
16 . The touch display device of claim 14 , wherein the at least one pseudo-touch electrode is disposed outside of the at least one dam.
17 . The touch display device of claim 1 , wherein the at least one pseudo-touch electrode includes a first pseudo-touch electrode line and a second pseudo-touch electrode line spaced apart from each other, wherein the touch display device further includes at least one pseudo-touch bridge line electrically connected to the first pseudo-touch electrode line and the second pseudo-touch electrode line.
18 . The touch display device of claim 1 , wherein the at least one pseudo-touch electrode comprises at least one pseudo-touch electrode line parallel to the plurality of touch electrodes, and wherein a pseudo-touch driving signal is applied to the at least one pseudo-touch electrode, and the pseudo-touch driving signal is reverse in phase to a touch driving signal supplied through the plurality of touch electrodes.
19 . The touch display device of claim 1 , further comprising a power line and a gate driving circuit at the non-display area.
20 . The touch display device of claim 19 , wherein the power line is disposed outside of gate driving circuit.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the benefit of Korean Patent Application No. 10-2021-0175919 filed on Dec. 9, 2021, which is hereby incorporated by reference as if fully set forth herein. BACKGROUND Technical Field The disclosure relates to a touch display device, and more particularly to a touch display device capable of reducing electromagnetic interference between a radio signal and a touch driving signal. Description of the Related Art With the progress of information-dependent society, various requirements for a display device for displaying an image are increasing. As such a display device, various display devices such as a liquid crystal display, an electroluminescent display, a quantum dot light emitting display, etc., are used. Such a display device provides a function for recognizing finger touch or pen touch of a user on a display panel, and performing input processing based on the recognized touch. For example, a touch display device capable of recognizing touch may include a plurality of touch electrodes disposed on or built in the display panel, and may detect whether or not there is touch of a user on the display panel, touch coordinates, etc., through driving of the touch electrodes. The use range of such a touch display device is expanding not only to a mobile appliance such as a smartphone or a tablet computer, but also to a large-screen touch display device such as a display for an automobile, a display for exhibition, etc. In addition, such a touch display device may be applicable not only to a mobile appliance such as a smartphone or a tablet computer, but also to a display for an automobile. In this case, the touch display device may use an antenna in order to communicate with other appliances. BRIEF SUMMARY For the touch display devices that uses an antenna, these devices may exhibit degradation of a transmission and reception performance for a radio signal and touch sensing performance due to the electromagnetic interference thereof with a touch driving signal in the case of transmitting and receiving a radio signal of a high-frequency band, such as 5G mmWave service. Accordingly, one or more embodiments of the disclosure address the various technical problems in the related art including the technical problem identified above. One or more embodiments of the disclosure provide a touch display device capable of reducing electromagnetic interference between a radio signal and a touch driving signal. One or more embodiments of the disclosure provide a touch display device achieving an enhancement in electromagnetic interference offset performance through effective disposition of a pseudo-electrode disposed in a non-display area of the touch display device. Additional advantages, technical benefits, and features of the disclosure will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the disclosure. The benefits and other advantages of the disclosure may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. To achieve these technical benefits and in accordance with the purpose of the disclosure, as embodied and broadly described herein, a touch display device includes, at a display panel including a display area and a non-display area surrounding the display area, a plurality of X-touch electrode lines extending in a first direction and receiving a touch driving signal, a plurality of Y-touch electrode lines extending in a second direction and transmitting a touch sensing signal, a plurality of X-touch lines extending in the second direction and transmitting the touch driving signal, at least one pseudo-touch routing line disposed at an outermost portion of the display panel, and at least one pseudo-touch electrode line extending from the at least one pseudo-touch routing line. The touch display device may further include a gate-in-panel (GIP) type gate driving circuit disposed in the non-display area. The at least one pseudo-touch electrode line may not overlap with the gate driving circuit. The touch display device may further include a power line disposed along the non-display area. The at least one pseudo-touch electrode line may not overlap with the power line. The at least one pseudo-touch electrode line may be disposed to be parallel to the X-touch electrode lines. A pseudo-touch driving signal reverse in phase to the touch driving signal may be applied to the at least one pseudo-touch electrode line. When the at least one pseudo-touch electrode line may include a plurality of pseudo-touch routing lines, the plurality of X-touch electrode lines may be divided into plural groups, and the plurality of pseudo-touch routing lines may correspond to the X-touch electrode lines of the plural groups, respectively. The numb