Electroluminescent Display Including Touch Sensor

Patent metadata

Field	Value
Publication number	US-2021208710-A1
Application number	US-202117209986-A
Country	US
Kind code	A1
Filing date	Mar 23, 2021
Priority date	Dec 29, 2017
Publication date	Jul 8, 2021
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; a transistor positioned on the flexible substrate; an anode electrode electrically connected with the transistor; a bank surrounding the anode electrode; an electroluminescent layer positioned on the anode electrode; a cathode electrode positioned on the electroluminescent layer; a flexible encapsulation unit positioned on the cathode electrode; a first mesh electrode layer positioned on the flexible encapsulation unit and overlapping the bank; an insulating layer covering the first mesh electrode layer; a second mesh electrode layer positioned on the insulating layer and overlapping the first mesh electrode layer and the bank; a first capacitance between the first mesh electrode layer and the cathode; and a second capacitance between the second mesh electrode layer and the first mesh electrode layer, wherein a magnitude of the first capacitance is greater than a magnitude of the second capacitance.

2 . The flexible electroluminescent display of claim 1 , further comprising:
a touch driver electrically connected to the first mesh electrode layer and the second mesh electrode layer, wherein the touch driver is configured to apply a predetermined voltage to each of the first mesh electrode layer and the second mesh electrode layer.

3 . The flexible electroluminescent display of claim 2 , wherein when the first capacitance increases due to the predetermined voltage and the second capacitance is reduced due to the predetermined voltage.

4 . The flexible electroluminescent display of claim 1 , wherein the first mesh electrode layer is divided into a plurality of first electrodes and a plurality of second electrodes, and wherein the second mesh electrode layer is divided into a plurality of third electrodes and a plurality of fourth electrodes, the second mesh electrode layer configured to sense a touch input,
wherein the plurality of first electrodes electrically connect together the plurality of fourth electrodes of the second mesh electrode layer.

5 . The flexible electroluminescent display of claim 2 , wherein the touch driver is configured to sequentially perform a mutual capacitance sensing drive and a self-capacitance sensing drive.

6 . The flexible electroluminescent display of claim 1 , wherein the flexible encapsulation unit includes a first inorganic encapsulation layer configured to seal the cathode electrode, an organic layer configured on the first inorganic encapsulation layer to planarize the first inorganic encapsulation layer, and a second inorganic encapsulation layer on the organic layer to seal the organic layer,
wherein a thickness of the flexible encapsulation unit is less than 10 μm.

7 . A touch sensor integrated display comprising:
a substrate; a plurality of subpixels disposed on the substrate, the plurality of subpixels including a plurality of circuit units and an electroluminescent diode electrically connected to the plurality of circuit units, at least one of the plurality of circuit units configured to supply an image signal to the electroluminescent diode; an encapsulation unit configured to cover the plurality of subpixels; a first mesh electrode layer disposed on the encapsulation unit, the first mesh electrode layer divided into a plurality of areas that are physically separated from each other by a first disconnection pattern; 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 divided into a plurality of areas that are physically separated from each other by a second disconnection pattern, wherein a shape of the first disconnection pattern is different from a shape of the second disconnection pattern, and wherein at least one of the plurality of areas of the first mesh electrode layer and one of the plurality of areas of the second mesh electrode layer are configured to respectively receive a first signal and a second signal having a same magnitude.

8 . The touch sensor integrated display of claim 7 , wherein a parasitic capacitance between the plurality of subpixels and the second mesh electrode layer is reduced by the first signal and the second signal having the same magnitude.

9 . The touch sensor integrated display of claim 7 , wherein the plurality of subpixels includes red subpixels, green subpixels, and blue subpixels,
wherein the subpixels are separated from one another by a bank, wherein the first mesh electrode layer and the second mesh electrode layer are vertically aligned with the bank.

10 . The touch sensor integrated display of claim 7 , wherein the plurality of areas of the second mesh electrode layer correspond to a plurality of first touch electrodes disposed along a first direction and a plurality of second touch electrodes along a second direction intersecting the first direction,
wherein the first mesh electrode layer includes active shielding electrodes that shield the plurality of first touch electrodes and the plurality of second touch electrodes from a common electrode.

11 . The touch sensor integrated display of claim 10 , wherein the active shielding electrodes are disposed along the first direction.

12 . An electroluminescent display comprising:
an electroluminescent element disposed in a display area of a substrate, the display area for displaying an image; an encapsulation unit disposed on the electroluminescent element; a plurality of transparent shielding electrodes disposed on the encapsulation unit, each of the plurality of transparent shielding electrodes including a first transparent shielding electrode along a first direction and a plurality of second transparent shielding electrodes along a second direction, wherein the first transparent shielding electrode intersects the plurality of second transparent shielding electrodes; a shielding electrode insulating layer covering the plurality of transparent shielding electrodes; a plurality of bridge mesh electrodes positioned on the shielding electrode insulating layer, the plurality of bridge mesh electrodes includes a plurality of first bridges and a plurality of second bridges; a first touch insulating layer covering the plurality of bridge mesh electrodes; and a plurality of mesh electrodes on the first touch insulating layer, the plurality of mesh electrodes including a plurality of first mesh electrodes along the first direction and a plurality of second mesh electrodes along the second direction; wherein a pair of second bridges from the plurality of second bridges are configured to electrically connect together the plurality of second transparent shielding electrodes of one of the plurality of transparent shielding electrodes through a contact hole of the shielding electrode insulating layer, wherein the plurality of first bridges are configured to electrically connect together plurality of first mesh electrodes through contact holes of the first touch insulating layer.

13 . The electroluminescent display of claim 12 , wherein the plurality of bridge mesh electrodes has a metal mesh shape including an opening in which a subpixel having the electroluminescent element is disposed.

14 . The electroluminescent display of claim 13 , further comprising:
a touch buffer layer disposed between the encapsulation unit and the plurality of transparent shielding electrodes.

15 . The electroluminescent display of claim 12 , wherein a thickness of the encapsulation unit is equal to or less than at least 5 μm.

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

• 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