Display device with integrated touch screen

Patent metadata

Field	Value
Publication number	US-10754461-B2
Application number	US-201815992630-A
Country	US
Kind code	B2
Filing date	May 30, 2018
Priority date	May 31, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

Disclosed is a display device with integrated touch screen, which can prevent a first touch electrode or a second touch electrode from being short-circuited with a bridge electrode through an opening. The display device includes first electrodes on a first substrate, a light emitting layer on the first electrodes, a second electrode on the light emitting layer, an encapsulation layer on the second electrode, a bridge electrode and a dummy electrode on the encapsulation layer, an insulation layer covering the bridge electrode and the dummy electrode, and a first touch electrode and a second touch electrode on the insulation layer. The first touch electrode is electrically connected to the bridge electrode, and bridge electrode is spaced apart from the dummy electrode.

First claim

The invention claimed is:

1. A display device with integrated touch screen, the display device comprising:
a substrate;
first electrodes on the substrate, the first electrodes spaced apart from neighboring first electrodes;
a bank disposed between neighboring ones of the first electrodes, the bank being on and contacting at feast a part of the first electrodes;
a light emitting layer on the first electrodes;
a second electrode on the light emitting layer;
an encapsulation layer on the second electrode;
a bridge electrode on the encapsulation layer;
a dummy electrode disposed on the encapsulation layer at an overlapping location with the bank;
an insulation layer covering the bridge electrode on the encapsulation layer; and
a first touch electrode and a second touch electrode on the insulation layer, the first touch electrode electrically connected to the bridge electrode.

2. The display device of claim 1 , wherein the dummy electrode is overlapped by the first touch electrode or the second touch electrode.

3. The display device of claim 1 , wherein the dummy electrode is a floating electrode.

4. The display device of claim 1 , wherein the first touch electrode is connected to the bridge electrode through a first contact hole which passes through the insulation layer and exposes the bridge electrode.

5. The display device of claim 1 , wherein the dummy electrode is electrically connected with the first touch electrode.

6. The display device of claim 5 , wherein the first touch electrode is connected to the dummy electrode through a second contact hole which passes through the insulation layer and exposes the dummy electrode.

7. The display device of claim 1 , wherein the dummy electrode is electrically connected with the second touch electrode.

8. The display device of claim 7 , wherein the second touch electrode is connected to the dummy electrode through a third contact hole which passes through the insulation layer and exposes the dummy electrode.

9. The display device of claim 1 ,
wherein at least one of the dummy electrode and the bridge electrode is overlapped with at least a part of the bank.

10. The display device of claim 9 , wherein the first and second touch electrodes are overlapped with at least a part of the bank.

11. The display device of claim 1 , wherein each of the bridge electrode and the dummy electrode has a three-layer structure.

12. The display device of claim 1 , wherein the bridge electrode and the dummy electrode are formed of a same material on the encapsulation layer and are substantially co-planar with one another.

13. The display device of claim 1 , wherein each of the first touch electrode and the second touch electrode has a three-layer structure, and the first and second touch electrodes are formed of a same material on a same layer.

14. The display device of claim 1 , further comprising an overcoat layer on the first and second touch electrodes, the overcoat layer configured to planarize a step height caused by the bridge electrode, the dummy electrode, and the first and second touch electrodes.

15. The display device of claim 1 , further comprising a touch buffer layer on the encapsulation layer, wherein the bridge electrode and the dummy electrode are disposed on and directly contacting the touch buffer layer.

16. The display device of claim 1 , wherein the bridge electrode has a mesh shape.

17. A display device with integrated touch screen, the display device comprising:
a substrate;
first electrodes on the substrate, the first electrodes spaced apart from neighboring first electrodes;
a bank disposed between respective ones of the first electrodes, the bank being on and contacting at least a part of the first electrodes;
a light emitting layer on the first electrode;
a second electrode on the light emitting layer;
an encapsulation layer on the second electrode;
a touch buffer layer on the encapsulation layer;
a bridge electrode having a multi-layer structure on the touch buffer layer at an overlapping location with the bank;
a dummy electrode on the touch buffer layer at an overlapping location with the bank;
an insulation layer covering the bridge electrode on the encapsulation layer; and
a first touch electrode and a second touch electrode on the insulation layer,
wherein the bridge electrode is electrically connected to the first touch electrode, and a side surface of the bridge electrode is provided in a positive taper shape.

18. The display device of claim 17 , wherein the dummy electrode overlaps the first touch electrode or the second touch electrode.

19. The display device of claim 17 , wherein the dummy electrode is a floating electrode.

20. The display device of claim 17 , wherein the first touch electrode is connected to the bridge electrode through a contact hole which passes through the insulation layer and exposes the bridge electrode.

21. The display device of claim 17 , wherein the dummy electrode is electrically connected with the first touch electrode.

22. The display device of claim 21 , wherein the first touch electrode is connected to the dummy electrode through a contact hole which passes through the insulation layer and exposes the dummy electrode.

23. The display device of claim 17 , wherein the dummy electrode is electrically connected with the second touch electrode.

24. The display device of claim 23 , wherein the second touch electrode is connected to the dummy electrode through a contact hole which passes through the insulation layer and exposes the dummy electrode.

25. The display device of claim 17 ,
wherein at least one of the dummy electrode and the bridge electrode is overlapped with at least a part of the bank.

26. The display device of claim 25 , wherein the first and second touch electrodes are overlapped with at least a part of the bank.

27. The display device of claim 17 , wherein each of the bridge electrode and the dummy electrode has a three-layer structure.

28. The display device of claim 17 , wherein the bridge electrode and the dummy electrode are formed of a same material on aril the touch buffer layer.

29. The display device of claim 17 , wherein the bridge electrode is a mesh type.

30. The display device of claim 1 , wherein the dummy electrode is insulated from the bridge electrode.

Assignees

• Lg Display Co Ltd

Inventors

• Pak Sanghoon
• Kim Minjoo
• Lee Jeonghoon
• Lee Yuna

Classifications

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• H10K59/40

  OLEDs integrated with touch screens · CPC title

• H10K59/131

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

• H10K50/844

  Encapsulations · CPC title