US-12619332-B2 - Touch sensor and touch display device with coil shape electrodes

US12619332B2US 12619332 B2US12619332 B2US 12619332B2US-12619332-B2

Abstract

A touch display device may include a plurality of vertical electrode lines each extending in a column direction, a plurality of horizontal electrode lines each extending in a row direction, and a plurality of unit sensor areas where the plurality of vertical electrode lines and the plurality of horizontal electrode lines intersect. The plurality of unit sensor areas may include a first unit sensor area where a first vertical electrode line among the plurality of vertical electrode lines and a first horizontal electrode line among the plurality of horizontal electrode lines intersect, and, in the first unit sensor area, each of the first horizontal electrode line and the first vertical electrode line may have a coil shape.

Inventors

Hyangmyoung GWON
Jihyun JUNG
Suchang An
Jaegyun Lee
Ruda RHE
Jeonghoon Lee

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20241220
Priority Date: 20240223

Claims (20)

1 . A touch display device comprising: a plurality of vertical electrode lines each extending in a column direction; a plurality of horizontal electrode lines each extending in a row direction; and a plurality of unit sensor areas where the plurality of vertical electrode lines and the plurality of horizontal electrode lines intersect, wherein a vertical electrode line in each of the plurality of unit sensor areas has a complex spiral structure, in which two pairs of vertical coil electrodes, extending spirally from both sides of a central segment of the plurality of vertical electrode lines, are interconnected by a bridge, and wherein, in each of the plurality of unit sensor areas, a portion of the vertical electrode line and a portion of a horizontal electrode line of the plurality of horizontal electrode lines are configured to generate a touch sensing signal based on a capacitive change caused by a finger touch, a stylus touch, or a pen touch.
2 . The touch display device of claim 1 , wherein the complex spiral structure of the vertical electrode line includes at least one curved segment repeatedly bent within each of the plurality of unit sensor areas.
3 . The touch display device of claim 1 , wherein the complex spiral structure is configured such that an effective electrode length within each of the plurality of unit sensor areas is increased compared to a straight-line electrode structure.
4 . The touch display device of claim 1 , wherein the plurality of vertical electrode lines and the plurality of horizontal electrode lines are disposed to interlock with each other on a same plane, and wherein at least one of the plurality of vertical electrode lines is wound into a coil shape.
5 . The touch display device of claim 4 , wherein a spiral portion of the vertical electrode line and a spiral portion of the horizontal electrode line are interlocked with each other within each of the plurality of unit sensor areas without overlapping.
6 . The touch display device of claim 1 , wherein, in each of the plurality of unit sensor areas, a spiral structure of the vertical electrode line and a corresponding portion of the horizontal electrode line cooperatively define a substantially closed boundary.
7 . The touch display device of claim 1 , wherein each of the plurality of vertical electrode lines includes a first vertical coil portion and a second vertical coil portion integrally formed and branching from a first vertical branching point, wherein a third vertical coil portion and a fourth vertical coil portion are integrally formed and branch from a second vertical branching point, wherein the first vertical coil portion, the second vertical coil portion, the third vertical coil portion, and the fourth vertical coil portion extend spirally within a unit sensor area of the plurality of unit sensor areas and are interconnected by the bridge to form the complex spiral structure, and wherein the horizontal electrode line includes a plurality of horizontal coil portions each wound together with a corresponding one of the first vertical coil portion, the second vertical coil portion, the third vertical coil portion, and the fourth vertical coil portion.
8 . The touch display device of claim 7 , wherein a coil shape of the first vertical coil portion and a coil shape of the second vertical coil portion are symmetrical to each other, and a coil shape of the third vertical coil portion and a coil shape of the fourth vertical coil portion are symmetrical to each other, and wherein the coil shape of the first vertical coil portion and the coil shape of the third vertical coil portion are symmetrical to each other, and the coil shape of the second vertical coil portion and the coil shape of the fourth vertical coil portion are symmetrical to each other.
9 . The touch display device of claim 1 , wherein, in each of the plurality of unit sensor areas, the vertical electrode line further includes: at least one vertical auxiliary electrode disposed between the vertical electrode line and the horizontal electrode line and electrically connected to the vertical electrode line; and wherein, in each of the plurality of unit sensor areas, the horizontal electrode line includes at least one auxiliary electrode disposed between the first-horizontal electrode line and the vertical electrode line and electrically connected to the horizontal electrode line.
10 . The touch display device of claim 1 , wherein each of the plurality of vertical electrode lines includes a plurality of vertical electrodes, and the bridge electrically connecting two adjacent vertical electrodes among the plurality of vertical electrodes, and wherein the bridge overlaps with one of the plurality of horizontal electrode lines without an electrical contact with one of the plurality of horizontal electrode lines.
11 . The touch display device of claim 10 , wherein the plurality of vertical electrode lines and the plurality of horizontal electrode lines are formed of a transparent conductive material that includes at least one of indium tin oxide, metal mesh, or silver nanowire.
12 . The touch display device of claim 10 , further comprising: a first metal layer; an insulating layer on the first metal layer; and a second metal layer on the insulating layer, wherein the bridge is within the first metal layer, wherein each of the plurality of vertical electrodes includes a first metal vertical electrode in the first metal layer and a second metal vertical electrode in the second metal layer, and the second metal vertical electrode is electrically connected to the first metal vertical electrode through a hole in the insulating layer, wherein each of the plurality of horizontal electrode lines includes a first metal horizontal electrode line in the first metal layer and a second metal horizontal electrode line in the second metal layer, and the second metal horizontal electrode line is electrically connected to the first metal horizontal electrode line through another hole in the insulating layer, and wherein a second metal vertical electrode included in each of the two adjacent vertical electrodes is electrically connected to the bridge through another hole in the insulating layer.
13 . The touch display device of claim 1 , further comprising: a plurality of horizontal routing wires and a plurality of vertical routing wires electrically connected to the plurality of horizontal electrode lines and the plurality of vertical electrode lines, respectively; a plurality of light emitting devices; and an encapsulation layer on the plurality of light emitting devices, the encapsulation layer having an inclined surface, wherein the plurality of horizontal electrode lines and the plurality of vertical electrode lines are on the encapsulation layer, wherein the plurality of horizontal routing wires and the plurality of vertical routing wires are along the inclined surface.
14 . The touch display device of claim 1 , further comprising: a display panel including a plurality of subpixels; and a touch driving circuit connected to the display panel, wherein the display panel includes the plurality of horizontal electrode lines and the plurality of vertical electrode lines, wherein, during a pen touch sensing period, a pen signal having a first frequency and output from a pen is applied to at least one of the plurality of horizontal electrode lines and the plurality of vertical electrode lines.
15 . The touch display device of claim 14 , wherein, during the pen touch sensing period, a current of the first frequency flows through at least one of the plurality of horizontal electrode lines and the plurality of vertical electrode lines, and wherein, during the pen touch sensing period, the touch driving circuit acquires a coordinate of a pen touch by the pen based on an amount of current flowing for each of the plurality of horizontal electrode lines and the plurality of vertical electrode lines.
16 . The touch display device of claim 14 , wherein, during a finger touch sensing period, a touch driving signal output from the touch driving circuit and having a second frequency is applied to at least one of the plurality of horizontal electrode lines or to at least one of the plurality of vertical electrode lines.
17 . A touch sensor comprising: a plurality of first electrode lines each extending in a first direction; and a plurality of second electrode lines each extending in a second direction different from the first direction, wherein a unit sensor area of a plurality of unit sensor areas is defined at an intersection region where one of the plurality of first electrode lines crosses one of the plurality of second electrode lines, wherein a first electrode line of the plurality of first electrode lines in each of the plurality of unit sensor areas has a complex spiral structure, in which two pairs of coil electrodes, extending spirally from both sides of the first electrode line, are interconnected by a bridge, wherein, in each of the plurality of unit sensor areas, a portion of the first electrode line and a portion of a second electrode line of the plurality of second electrode lines are arranged to be interdigitated with each other, and wherein the first electrode line and the second electrode line are configured to detect a touch input based on a capacitive change caused by a finger touch, a stylus touch, or a pen touch.
18 . The touch sensor of claim 17 , wherein, when a pen signal having a first frequency is input, a current having the first frequency flows through at least one of the plurality of first electrode lines and the plurality of second electrode lines.
19 . The touch sensor of claim 18 , wherein a signal with a frequency that is different from the first frequency is blocked by the touch sensor.
20 . The touch sensor of claim 17 , wherein the plurality of first electrode lines and the plurality of second electrode lines are configured such that a capacitance change generated by a pen input is greater than a capacitance change generated by a finger input.

Description

CROSS REFERENCE TO RELATED APPLICATION This application claims priority from Republic of Korea Patent Application No. 10-2024-0026315, filed on Feb. 23, 2024, which is hereby incorporated by reference in its entirety. TECHNICAL FIELD Embodiments of the present disclosure relate to a touch sensor and a touch display device. BACKGROUND Recently, a touch display device capable of detecting the user's touch and providing touch-based input processing functions has been developed. In order to provide more various application functions, there has been developed a touch sensing technology utilizing a pen in addition to a finger of a user. A touch display device may have various electrodes or lines disposed around a touch sensor in addition to the touch sensor for touch detection. This may cause coupling noise between the touch sensor and the electrodes or lines around the touch sensor. The coupling noise may be a factor deteriorating the touch sensing performance using the touch sensor. SUMMARY Embodiments of the present disclosure may provide a touch sensor and a touch display device with a structure capable of reducing coupling noise with other surrounding electrodes. Embodiments of the present disclosure may provide a touch sensor and a touch display device with a structure capable of improving touch sensing performance. Embodiments of the present disclosure may provide a touch sensor and a touch display device with a coil-type structure capable of sensing pen touch based on inductance. Embodiments of the present disclosure may provide a touch sensor and a touch display device capable of blocking a noise on its own. Embodiments of the present disclosure may provide a touch sensor and a touch display device with a structure enabling both capacitance-based finger touch sensing and inductance-based pen touch sensing. A touch display device according to embodiments of the present disclosure may include a plurality of vertical electrode lines each extending in a column direction, a plurality of horizontal electrode lines each extending in a row direction, and a plurality of unit sensor areas where the plurality of vertical electrode lines and the plurality of horizontal electrode lines intersect. In the touch display device according to embodiments of the present disclosure, the plurality of unit sensor areas may include a first unit sensor area where a first vertical electrode line among the plurality of vertical electrode lines and a first horizontal electrode line among the plurality of horizontal electrode lines intersect. In the touch display device according to embodiments of the present disclosure, in the first unit sensor area, each of the first horizontal electrode line and the first vertical electrode line may have a coil shape. In the touch display device according to embodiments of the present disclosure, in the first unit sensor area, each of the first horizontal electrode line and the first vertical electrode line may be interlocked with each other and wound in a coil shape. In the touch display device according to embodiments of the present disclosure, during a pen touch sensing period, a pen signal having a first frequency and output from a pen which contacts or is close to the display panel may be applied to at least one of the plurality of horizontal electrode lines and the plurality of vertical electrode lines. In the touch display device according to embodiments of the present disclosure, during the pen touch sensing period, a current of the first frequency may flow through at least one of the plurality of horizontal electrode lines and the plurality of vertical electrode lines. A touch sensor according to embodiments of the present disclosure may include a plurality of first electrode lines each extending in a first direction and having a coil shape, and a plurality of second electrode lines each extending in a second direction different from the first direction and having a coil shape. In the touch sensor according to embodiments of the present disclosure, the plurality of first electrode lines and the plurality of second electrode lines may be interlocked with each other on the same plane and wound in a coil shape. In the touch sensor according to embodiments of the present disclosure, when a pen signal having a first frequency is input, a current having the first frequency may flow through at least one of the plurality of first electrode lines and the plurality of second electrode lines. In the touch sensor according to embodiments of the present disclosure, a signal or a current with a frequency different from the first frequency may be blocked by the touch sensor. According to embodiments of the present disclosure, it is possible to provide a touch sensor and a touch display device with a structure capable of reducing coupling noise with other surrounding electrodes. According to embodiments of the present disclosure, it is possible to provide a touch sensor and a touch display device with a