Electroluminescent Display Including Touch Sensor

Patent metadata

Field	Value
Publication number	US-2023176697-A1
Application number	US-202318165008-A
Country	US
Kind code	A1
Filing date	Feb 6, 2023
Priority date	Dec 29, 2017
Publication date	Jun 8, 2023
Grant date	—

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; and a mesh electrode layer on the encapsulation unit.

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

3 . The flexible electroluminescent display of claim 2 , wherein the 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 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 the 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:
an insulating layer on the mesh electrode layer.

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

10 . The flexible electroluminescent display of claim 9 , 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.

11 . 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; and a mesh touch electrode on the encapsulation unit.

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

13 . The flexible electroluminescent display of claim 11 , wherein the cathode electrode is in contact with the spacer or the bank.

14 . The flexible electroluminescent display of claim 11 , wherein the mesh touch electrode overlaps the spacer.

15 . The flexible electroluminescent display of claim 11 , wherein the transistor is a driving transistor or a switching transistor.

16 . The flexible electroluminescent display of claim 11 , wherein the electroluminescent layer comprises a multi-layer structure.

17 . The flexible electroluminescent display of claim 11 , wherein the bank comprises an opening on the anode electrode to define an emission region, the opening having a diamond shape.

18 . The flexible electroluminescent display of claim 11 , wherein the mesh touch electrode overlaps the bank.

19 . The flexible electroluminescent display of claim 11 , further comprising:
a shielding electrode on the flexible substrate, the shielding electrode overlapping the bank or the transistor.

20 . The flexible electroluminescent display of claim 11 , wherein the mesh touch electrode comprises a first mesh electrode on the encapsulation unit, a first touch insulating layer on the first mesh electrode, and a second mesh electrode on the first touch insulating layer.

21 . The flexible electroluminescent display of claim 20 , wherein a width of a wire of the first mesh electrode is equal to or greater than a width of a wire of the second mesh electrode.

22 . The flexible electroluminescent display of claim 20 , wherein the first mesh electrode is flexible.

23 . The flexible electroluminescent display of claim 11 , wherein a distance between the mesh touch electrode and the cathode electrode in a central area of the bank is less than a distance between the mesh touch electrode and the cathode electrode in an emission region.

24 . The flexible electroluminescent display of claim 11 , further comprising:
a touch buffer layer.

25 . The flexible electroluminescent display of claim 24 , wherein touch buffer layer is between the encapsulation unit and the mesh touch electrode.

26 . The flexible electroluminescent display of claim 24 , wherein touch buffer layer is in the pad area.

Assignees

• Lg Display Co Ltd

Inventors

• Han Jonghyun
• Shin Seungrok

Classifications

• G06F2203/04102

  Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper · CPC title

• G06F3/0418

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• H10K59/40

  OLEDs integrated with touch screens · 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

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title