Display device with improved touch recognition capabilities

Patent metadata

Field	Value
Publication number	US-12389779-B2
Application number	US-202318544641-A
Country	US
Kind code	B2
Filing date	Dec 19, 2023
Priority date	Dec 30, 2022
Publication date	Aug 12, 2025
Grant date	Aug 12, 2025

Abstract

The disclosure relates to a display device. In an embodiment, a display device includes a lower substrate including a plurality of sub pixels forming an active area and a non-active area enclosing the active area; a thin film transistor on the lower substrate corresponding to one of the plurality of sub pixels; a light emitting diode on the thin film transistor corresponding to the one of the plurality of sub pixels; a plurality of first touch electrodes on the light emitting diode corresponding to the active area; a plurality of second touch electrodes on the plurality of first touch electrodes corresponding to the active area; a first shielding electrode between the light emitting diode and the plurality of first touch electrodes overlapping a first touch electrode; and a second shielding electrode between the light emitting diode and the plurality of first touch electrodes, wherein the second shielding electrode does not overlap the first touch electrode.

First claim

What is claimed is:

1. A display device, comprising:
a lower substrate including a plurality of sub pixels and including an active area and a non-active area which encloses the active area;
a thin film transistor on the lower substrate corresponding to one of the plurality of sub pixels;
a light emitting diode on the thin film transistor corresponding to the one of the plurality of sub pixels;
a plurality of first touch electrodes on the light emitting diode corresponding to the active area;
a plurality of second touch electrodes on the plurality of first touch electrodes corresponding to the active area;
a first shielding electrode between the light emitting diode and the plurality of first touch electrodes overlapping a first touch electrode of the plurality of first touch electrodes;
a second shielding electrode between the light emitting diode and the plurality of first touch electrodes, wherein the second shielding electrode does not overlap the first touch electrode; and,
a third shielding electrode in a dummy area that does not overlap the first shielding electrode and the second shielding electrode, the dummy area being a non-emission area,
wherein the third shielding electrode is randomly disposed in the dummy area.

2. The display device according to claim 1 , wherein the first shielding electrode and the second shielding electrode vertically overlap the thin film transistor.

3. The display device according to claim 1 , wherein the second shielding electrode overlaps one of the plurality of second touch electrodes.

4. The display device according to claim 1 , wherein each of the plurality of first touch electrodes has a mesh pattern including a plurality of openings.

5. The display device according to claim 4 , wherein each of the plurality of first touch electrodes includes a plurality of first metal lines extending in a first direction and a plurality of second metal lines extending in a second direction which is different from the first direction, the plurality of first metal lines and the plurality of second metal lines are connected to each other to form the plurality of openings, each of the plurality of openings corresponding to emission areas of one or more sub pixels, and the plurality of first metal lines and the plurality of second metal lines correspond to non-emission areas of one or more sub pixels.

6. The display device according to claim 5 , wherein the second shielding electrode is disposed in a non-emission area located within one pixel distance from the first shielding electrode.

7. The display device according to claim 6 , wherein the first shielding electrode includes a first shielding metal line and a second shielding metal line disposed so as to overlap the first metal line and the second metal line, and
the second shielding electrode includes:
an area which extends from the first shielding metal line to the second direction by one pixel distance, and
an area which is spaced apart from the first shielding metal line by one pixel distance to extend in the first direction.

8. The display device according to claim 6 , wherein the one pixel distance is a size of one sub pixel to a size of three sub pixels.

9. The display device according to claim 1 , wherein a width of the first shielding electrode is larger than a width of the first touch electrode.

10. The display device according to claim 1 , wherein a width of the second shielding electrode is smaller than a width of the first touch electrode.

11. The display device according to claim 1 , wherein the third shielding electrode has a varying width.

12. The display device according to claim 1 , further comprising:
one or more first touch routing lines in the non-active area connected to each of a plurality of first touch electrode lines;
one or more second touch routing lines connected to each of a plurality of second touch electrode lines; and
one or more shielding routing lines connected to the first shielding electrode and the second shielding electrode,
wherein the first touch routing line, the second touch routing line, and the shielding routing line have triple wiring patterns.

13. The display device according to claim 12 , wherein each of the first touch routing line, the second touch routing line, and the shielding routing line includes a first electrode layer formed on the same layer as the first shielding electrode and the second shielding electrode, a second electrode layer formed on the same layer as the first touch electrode, and a third electrode layer formed on the same layer as the second touch electrode, and the first electrode layer, the second electrode layer, and the third electrode layer are electrically connected to each other through a contact hole formed in an insulating layer.

14. The display device according to claim 13 , wherein the first touch routing line and the second touch routing line are connected to a touch pad disposed in the non-active area and at least one of the first electrode layer, the second electrode layer, and the third electrode layer is in contact with the touch pad.

15. The display device according to claim 14 , wherein the first touch routing line and the second touch routing line extend toward the touch pad and are adjacent to the touch pad to include only any one of the first electrode layer, the second electrode layer, and the third electrode layer.

16. A display device, comprising:
a substrate including a plurality of sub pixels forming an active area and a non-active area enclosing the active area;
a thin film transistor on the substrate;
a light emitting diode on the thin film transistor;
a plurality of first touch electrodes on the light emitting diode;
a first shielding electrode overlapping at least one of the plurality of first touch electrodes;
a second shielding electrode not overlapping the at least one of the plurality of first touch electrodes; and
a third shielding electrode in a dummy area that does not overlap the first shielding electrode and the second shielding electrode, the dummy area being a non-emission area,
wherein the third shielding electrode is randomly disposed in the dummy area.

17. The display device of claim 16 , further comprising:
a plurality of second touch electrodes, wherein the second shielding electrode overlaps at least one of the plurality of second touch electrodes.

18. The display device of claim 17 , wherein the plurality of first touch electrodes and the plurality of second touch electrodes correspond to the active area.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Mirae
• Kong Minsuk
• Jeon Youngjun
• Choe Youngjin

Classifications

• H10K59/1213 Primary

  the pixel elements being TFTs · CPC title

• G06F3/0445

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title

• H10K59/126

  Shielding, e.g. light-blocking means over the TFTs · CPC title

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title