Display panel including touch sensor, display panel comprising the same and method for detecting defect thereof

Patent metadata

Field	Value
Publication number	US-11018203-B2
Application number	US-201916719094-A
Country	US
Kind code	B2
Filing date	Dec 18, 2019
Priority date	Dec 31, 2018
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A display panel, a display device comprising the display panel, and a method for detecting a defect thereof are provided. The display panel includes a touch sensor having at least one defect detection pattern to detect a defect by changing the configuration of an array. Thereby, a defect detection at the outside of the array can be easily accomplished.

First claim

What is claimed is:

1. A display panel comprising:
a substrate comprising an active area having a plurality of subpixels, and a non-active area to surround the active area;
at least one thin film transistor in each of the subpixels;
a light emitting device comprising a first electrode connected to the at least one thin film transistor, and a light emitting layer and a second electrode;
an encapsulation stack comprising at least one organic encapsulation film and at least one inorganic encapsulation film configured to cover the light emitting device;
a touch sensor comprising a plurality of touch electrodes formed on the encapsulation stack in the active area; and
a first sensing pattern and a second sensing pattern located in the non-active area and respectively connected to the touch sensor and the second electrode,
at least one of the first sensing pattern and the second sensing pattern protruding farther than an end of the encapsulation stack in an outward direction.

2. The display panel according to claim 1 , wherein the plurality of touch electrodes include a first touch electrode arranged in a first direction and a second touch electrode arranged in a second direction that intersects with the first direction, and
wherein the first touch electrode is used as a touch driving line, and the second touch electrode is used as a touch sensing line.

3. The display panel according to claim 2 , wherein the first touch electrode includes a plurality of first touch patterns and first bridges integrally connecting adjacent first touch patterns, and
the second touch electrode includes a plurality of second touch patterns spaced apart from each other and second bridges formed in a different layer from the second touch patterns and electrically connecting adjacent second touch patterns.

4. The display panel according to claim 3 , wherein each of the first and second touch patterns comprises a mesh pattern formed of a metal.

5. The display panel according to claim 1 , wherein the first sensing pattern extends from at least one of the touch electrodes toward the non-active area.

6. The display panel according to claim 1 , wherein the second sensing pattern is formed by the same metal layer as the first electrode, around the first sensing pattern.

7. The display panel according to claim 1 , wherein the at least one inorganic encapsulation film is interposed between the first sensing pattern and the second sensing pattern.

8. The display panel according to claim 7 , wherein the second sensing pattern is exposed from the at least one inorganic encapsulation film.

9. The display panel according to claim 7 , further comprising at least one dam pattern in the non-active area and configured to surround the active area.

10. The display panel according to claim 9 , wherein the at least one dam pattern comprises a first dam pattern and a second dam pattern located outside the first dam pattern and having a height higher than the first dam pattern.

11. The display panel according to claim 10 , wherein the at least one dam pattern further comprises a third dam pattern located outside the second dam pattern.

12. The display panel according to claim 10 , wherein at least one of the first and second dam patterns overlaps the second sensing pattern.

13. The display panel according to claim 10 , wherein at least one of the first, second and third dam patterns overlaps a connection metal.

14. The display panel according to claim 10 , wherein the third dam pattern overlaps a step portion of the second sensing pattern contacting a connection metal.

15. The display panel according to claim 9 , further comprising touch routing lines provided between the active area and the at least one dam pattern.

16. The display panel according to claim 1 , further comprising a connection metal in the same layer as at least one electrode of the at least one thin film transistor, in the non-active area to connect the second electrode to the second sensing pattern.

17. The display panel according to claim 16 , wherein the connection metal has a plurality of island-type connection patterns located in the same layer as the second sensing pattern.

18. The display panel according to claim 17 , further comprising a first auxiliary sensing pattern connecting the connection metal to the second electrode extending to the non-active area.

19. The display panel according to claim 18 , wherein the first auxiliary sensing pattern is formed below a bank.

20. The display panel according to claim 18 , further comprising power lines, wherein the first auxiliary sensing pattern is formed between a bank and the power lines.

21. The display panel according to claim 1 , further comprising a protective film on the touch sensor, and configured to protect the touch sensor.

22. The display panel according to claim 21 , wherein the protective film extends to the non-active area and covers the first and second dam patterns.

23. The display panel according to claim 21 , wherein the protective film exposes the first sensing pattern and the second sensing pattern in a part of the non-active area.

24. The display panel according to claim 21 , wherein the protective film comprises an organic protective film and an inorganic protective film.

25. A display device comprising:
the display panel according to claim 1 ; and
a plurality of driving units configured to drive the display panel.

Assignees

• Lg Display Co Ltd

Inventors

• Song Eun-Ah

Classifications

• H10K59/873

  Encapsulations · CPC title

• H10K59/40

  OLEDs integrated with touch screens · CPC title

• G06F3/0446 Primary

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

• G01R27/2605

  Measuring capacitance (capacitive sensors G01D5/24) · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title