Touch display device

Patent metadata

Field	Value
Publication number	US-11494017-B2
Application number	US-202017251796-A
Country	US
Kind code	B2
Filing date	Jul 29, 2020
Priority date	Jul 14, 2020
Publication date	Nov 8, 2022
Grant date	Nov 8, 2022

Abstract

The present disclosure provides a touch display device including an organic light emitting diode (OLED) display panel and a touch layer. The OLED display panel includes a common cathode and a plurality of redundant cathodes. The common cathode and the plurality of redundant cathodes are located in a same conductive layer. The touch layer is disposed on a side of the OLED display panel. The touch layer includes a plurality of touch electrodes. Orthographic projections of the touch electrodes on the touch display device partially overlap orthographic projections of the plurality of redundant cathodes on the touch display device.

First claim

What is claimed is:

1. A touch display device, wherein the touch display device comprises:
an organic light emitting diode (OLED) display panel, the OLED display panel comprising a common cathode and a plurality of redundant cathodes, and the common cathode and the plurality of redundant cathodes located in a same conductive layer and electrically insulated, wherein the plurality of redundant cathodes are floating; and
a touch layer, the touch layer disposed on a side of the OLED display panel, and the touch layer comprising a plurality of touch electrodes; and
wherein orthographic projections of the plurality of touch electrodes on the touch display device partially overlap orthographic projections of the plurality of redundant cathodes on the touch display device; and
the OLED display panel further comprises an encapsulation layer, and the encapsulation layer is located between the common cathode and the touch layer,
wherein the OLED display panel comprises a plurality of subpixels and an insulating layer, the insulating layer comprises a plurality of openings, the plurality of subpixels are disposed in the plurality of openings, the plurality of subpixels share the common cathode, each of the redundant cathodes is positioned between adjacent two of the subpixels, the OLED display panel further comprises partition portions disposed on portions of the insulating layer, each of the portions of the insulating layer is positioned between adjacent two of the subpixels, and the partition portions are configured to separate the common cathode from the plurality of redundant cathodes, and
wherein the partition portions are grooves defined in the insulating layer, at least a part portion of each of the grooves adjacent to a bottom of the grooves has a first width, at least a part portion of each of the grooves away from the bottom of the grooves has a second width, the first width is greater than the second width, and the redundant cathodes are disposed in the grooves.

2. The touch display device in claim 1 , wherein the touch electrodes comprise a plurality of metal meshes, each of the metal meshes surrounds one of the subpixels, an orthographic projection of each of the metal meshes on the touch display device partially overlaps the orthographic projections of the plurality of redundant cathodes on the touch display device.

3. The touch display device in claim 2 , wherein the orthographic projections of the plurality of redundant cathodes on the touch display device are evenly arranged along orthographic projections of the plurality of metal meshes on the touch display device.

4. The touch display device in claim 2 , wherein the metal meshes comprise metal lines, a dimension of each of the partition portions along a width direction of the metal lines is greater than or equal to a width of one of the metal lines.

5. The touch display device in claim 1 , wherein each of the grooves comprises a first groove and a second groove communicated with the first groove, the first groove has the first width, the second groove has the second width, and each of the redundant cathodes is disposed in the first groove.

6. The touch display device in claim 1 , wherein the insulating layer further comprises a pixel definition layer, the grooves are defined in the pixel definition layer.

7. A touch display device, wherein the touch display device comprises:
an organic light emitting diode (OLED) display panel, the OLED display panel comprising a common cathode and a plurality of redundant cathodes, and the common cathode and the plurality of redundant cathodes located in a same conductive layer and electrically insulated, wherein the plurality of redundant cathodes are floating; and
a touch layer, the touch layer disposed on a side of the OLED display panel, and the touch layer comprising a plurality of touch electrodes; and
wherein orthographic projections of the plurality of touch electrodes on the touch display device partially overlap orthographic projections of the plurality of redundant cathodes on the touch display device,
wherein the OLED display panel comprises a plurality of subpixels and an insulating layer, the insulating layer comprises a plurality of openings, the plurality of subpixels are disposed in the plurality of openings, the plurality of subpixels share the common cathode, each of the redundant cathodes is positioned between adjacent two of the subpixels, the OLED display panel further comprises partition portions disposed on portions of the insulating layer, each of the portions of the insulating layer is positioned between adjacent two of the subpixels, and the partition portions are configured to separate the common cathode from the plurality of redundant cathodes, and
wherein the partition portions are grooves defined in the insulating layer, at least a part portion of each of the grooves adjacent to a bottom of the grooves has a first width, at least a part portion of each of the grooves away from the bottom of the grooves has a second width, the first width is greater than the second width, and the redundant cathodes are disposed in the grooves.

8. The touch display device in claim 7 , wherein the touch electrodes comprise a plurality of metal meshes, each of the metal meshes surrounds one of the subpixels, an orthographic projection of each of the metal meshes on the touch display device partially overlaps the orthographic projections of the plurality of redundant cathodes on the touch display device.

9. The touch display device in claim 8 , wherein the orthographic projections of the plurality of redundant cathodes on the touch display device are evenly arranged along orthographic projections of the plurality of metal meshes on the touch display device.

10. The touch display device in claim 8 , wherein the metal meshes comprise metal lines, a dimension of each of the partition portions along a width direction of the metal lines is greater than or equal to a width of one of the metal lines.

11. The touch display device in claim 7 , wherein each of the grooves comprises a first groove and a second groove communicated with the first groove, the first groove has the first width, the second groove has the second width, and each of the redundant cathodes is disposed in the first groove.

12. The touch display device in claim 7 , wherein the insulating layer further comprises a pixel definition layer, the grooves are defined in the pixel definition layer.

13. The touch display device in claim 11 , wherein the insulating layer further comprises a pixel definition layer and a planarization layer, the second groove is defined in the pixel definition layer and penetrates through the pixel definition layer along a thickness direction of the pixel definition layer, and the first groove is defined in the planarization layer.

14. The touch display device in claim 11 , wherein a longitudinal section of the first groove is an inverted trapezoid, and a longitudinal section of the second groove is an inverted trapezoid.

15. The touch display device in claim 7 , wherein a percentage ratio of an area of the common cathode to a sum of the area of the common cathode and areas of the plurality of redundant cathodes is greater than or equal to 75% and is less than 100%.

16. The touch display device in claim 7 , wherein the touch electrodes comprise driving electrodes and sensing electrodes, and the driving electrodes are electrically insulated from the sensing electrodes.

Assignees

• Wuhan China Star Optoelectronics Semiconductor Display Tech Co Ltd

Inventors

• Ye Jian

Classifications

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04112

  Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material · 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

• H01L27/323

  Electricity · mapped topic

• H01L27/3246

  Electricity · mapped topic