Electroluminescent display including touch sensor

Patent metadata

Field	Value
Publication number	US-11914822-B2
Application number	US-202318165008-A
Country	US
Kind code	B2
Filing date	Feb 6, 2023
Priority date	Dec 29, 2017
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

An electroluminescent display is disclosed. The electroluminescent display includes an electroluminescent element disposed in a display area of a substrate, an encapsulation unit disposed on the electroluminescent element, a first mesh electrode layer disposed on the encapsulation unit, an insulating layer covering the first mesh electrode layer, and a second mesh electrode layer disposed on the insulating layer. The first mesh electrode layer includes a first mesh electrode and a second mesh electrode separated from the first mesh electrode. The second mesh electrode layer includes a third mesh electrode extended in a first direction and a fourth mesh electrode extended in a second direction intersecting the first direction through the first mesh electrode intersecting the third mesh electrode.

First claim

What is claimed is:

1. A flexible electroluminescent display comprising:
a flexible substrate including a display region and a non-display region;
a pad area on the non-display region;
a transistor on the display region of the flexible substrate, the transistor having an active layer, a source electrode, a drain electrode, and a gate electrode;
a planarization layer on the transistor;
an anode electrode on the planarization layer;
a bank surrounding the anode electrode;
a spacer on the bank;
an electroluminescent layer on the anode electrode;
a cathode electrode on the electroluminescent layer and the bank;
an encapsulation unit on the cathode electrode;
a first mesh electrode layer on the encapsulation unit overlapping the bank, and configured to generate a first capacitance with the cathode electrode;
a touch insulating layer covering the first mesh electrode layer; and
a second mesh electrode layer on the touch insulating layer, overlapping the first mesh electrode layer, and configured to generate a second capacitance with the first mesh electrode layer;
wherein a width of a wire of the first mesh electrode layer is greater than a width of a wire of the second mesh electrode layer.

2. The flexible electroluminescent display of claim 1 , wherein the second mesh electrode layer is for sensing a touch.

3. The flexible electroluminescent display of claim 2 , wherein the second mesh electrode layer has a plurality of first mesh electrodes extending in a first direction, a plurality of second mesh electrodes extended in a second direction, and
wherein the first mesh electrode layer includes at least one bridge contacting two adjacent first mesh electrodes from the plurality of first mesh electrodes.

4. The flexible electroluminescent display of claim 3 , wherein the at least one bridge has a bent structure.

5. The flexible electroluminescent display of claim 3 , wherein the at least one bridge includes at least one opening.

6. The flexible electroluminescent display of claim 3 , wherein the at least one bridge has at least two contact holes at one end thereof.

7. The flexible electroluminescent display of claim 1 , wherein at least one of the first mesh electrode layer and the second mesh electrode layer comprises a three-layer structure including a first titanium layer, an aluminum layer, and a second titanium layer.

8. The flexible electroluminescent display of claim 1 , further comprising:
a plurality of functional layers on the first mesh electrode layer.

9. The flexible electroluminescent display of claim 8 , wherein the plurality of functional layers include a protective film, an antistatic film, a polarizing film, an external light absorbing film, or a protective glass.

10. A flexible electroluminescent display comprising:
a flexible substrate including a display region and a non-display region;
a pad area on the non-display region;
a transistor on the display region of the flexible substrate, the transistor having an active layer, a source electrode, a drain electrode, and a gate electrode;
a planarization layer on the transistor;
an anode electrode on the planarization layer;
a bank surrounding the anode electrode;
a spacer on the bank;
an electroluminescent layer on the anode electrode;
a cathode electrode on the electroluminescent layer and the bank;
an encapsulation unit on the cathode electrode;
a first mesh touch electrode on the encapsulation unit;
a first touch insulating layer on the first mesh touch electrode;
a second mesh touch electrode on the first touch insulating layer;
a first capacitance between the first mesh touch electrode and the cathode electrode; and
a second capacitance between the second mesh touch electrode and the first mesh touch electrode,
wherein a width of a wire of the first mesh touch electrode is greater than a width of a wire of the second mesh touch electrode.

11. The flexible electroluminescent display of claim 10 , wherein the cathode electrode is on the spacer.

12. The flexible electroluminescent display of claim 10 , wherein the cathode electrode is in contact with the spacer or the bank.

13. The flexible electroluminescent display of claim 10 , wherein at least one of the first mesh touch electrode and the second mesh touch electrode overlaps the spacer.

14. The flexible electroluminescent display of claim 10 , wherein the transistor is a driving transistor or a switching transistor.

15. The flexible electroluminescent display of claim 10 , wherein the electroluminescent layer comprises a multi-layer structure.

16. The flexible electroluminescent display of claim 10 , wherein the bank comprises an opening on the anode electrode to define an emission region, the opening having a diamond shape.

17. The flexible electroluminescent display of claim 10 , wherein at least one of the first mesh touch electrode and the second mesh touch electrode overlaps the bank.

18. The flexible electroluminescent display of claim 10 , further comprising:
a shielding electrode on the flexible substrate, the shielding electrode overlapping the bank or the transistor.

19. The flexible electroluminescent display of claim 10 , wherein the first mesh touch electrode is flexible.

20. The flexible electroluminescent display of claim 10 , wherein a distance between the first mesh touch electrode and the cathode electrode in a central area of the bank is less than a distance between the first mesh touch electrode and the cathode electrode in an emission region.

21. The flexible electroluminescent display of claim 10 , further comprising:
a touch buffer layer.

22. The flexible electroluminescent display of claim 21 , wherein touch buffer layer is between the encapsulation unit and the first mesh touch electrode.

23. The flexible electroluminescent display of claim 21 , wherein touch buffer layer is in the pad area.

Assignees

• Lg Display Co Ltd

Inventors

• Han Jonghyun
• Shin Seungrok

Classifications

• H10K50/844

  Encapsulations · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• H10K59/873

  Encapsulations · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title