Electroluminescent display including touch sensor

Patent metadata

Field	Value
Publication number	US-10983639-B2
Application number	US-201816215347-A
Country	US
Kind code	B2
Filing date	Dec 10, 2018
Priority date	Dec 29, 2017
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

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. 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 first mesh electrode layer disposed on the encapsulation unit, the first mesh electrode layer including a first mesh electrode and a second mesh electrode that is physically separated from the first mesh electrode;
an insulating layer covering the first mesh electrode layer; and
a second mesh electrode layer disposed on the insulating layer, the second mesh electrode layer including a third mesh electrode and a fourth mesh electrode, wherein the third mesh electrode extends in a first direction and the fourth mesh electrode extends in a second direction that intersects the first direction such that the first mesh electrode of the first mesh electrode layer intersects the third mesh electrode,
wherein the first mesh electrode electrically contacts the fourth mesh electrode adjacent to the first mesh electrode through a contact hole,
wherein the second mesh electrode is configured to shield at least a portion of the third mesh electrode and at least a portion of the fourth mesh electrode, and
wherein the third mesh electrode and the fourth mesh electrode serve as X and Y electrodes.

2. The electroluminescent display of claim 1 , wherein the first mesh electrode layer includes a first opening and a first disconnection portion where a portion of the first mesh electrode layer is disconnected, and the second mesh electrode layer includes a second opening and a second disconnection portion where a portion of the second mesh electrode layer is disconnected,
wherein the first opening and the second opening are configured to surround an emission region of the electroluminescent element, or the emission region of the electroluminescent element is disposed in the first disconnection portion and the second disconnection portion.

3. The electroluminescent display of claim 1 , wherein the electroluminescent element includes a common electrode, and
wherein the first mesh electrode and the common electrode are configured to generate a capacitance.

4. The electroluminescent display of claim 3 , wherein the second mesh electrode is configured to generate a capacitance and sense a touch input based on a change in the capacitance.

5. The electroluminescent display of claim 4 , wherein a parasitic capacitance between the common electrode and the third mesh electrode and the fourth mesh electrode is reduced by the second mesh electrode of the first mesh electrode layer.

6. The electroluminescent display of claim 5 , wherein the third mesh electrode and the fourth mesh electrode are configured to operate using at least one of a mutual capacitance sensing method and a self-capacitance sensing method,
wherein the second mesh electrode is configured to operate corresponding to the at least one sensing method.

7. The electroluminescent display of claim 1 , wherein the electroluminescent element includes a common electrode,
wherein a distance between the common electrode and the first mesh electrode layer is 3 μm to 30 μm, and a distance between the first mesh electrode layer and the second mesh electrode layer is 0.01 μm to 3 μm.

8. The electroluminescent display of claim 1 , wherein at least 80% of an area of the second mesh electrode layer overlaps the first mesh electrode layer in the display area.

9. An electroluminescent display comprising:
a substrate including a display area for displaying an image;
an electroluminescent element on the display area of the substrate, the electroluminescent element including a common electrode;
an encapsulation unit on the electroluminescent element;
a first mesh electrode layer on the encapsulation unit, the first mesh electrode layer overlapping the common electrode;
an insulating layer over the first mesh electrode layer; and
a second mesh electrode layer on the insulating layer, the second mesh electrode layer overlapping both the first mesh electrode layer and the common electrode with the first mesh electrode layer between the second mesh electrode layer and the common electrode,
wherein the first mesh electrode layer includes a first mesh electrode and a second mesh electrode that is physically separated from the first mesh electrode, and the second mesh electrode layer including a third mesh electrode and a fourth mesh electrode,
wherein the first mesh electrode electrically contacts the fourth mesh electrode adjacent to the first mesh electrode through a contact hole,
wherein the second mesh electrode is configured to shield at least a portion of the third mesh electrode and at least a portion of the fourth mesh electrode, and
wherein the third mesh electrode and the fourth mesh electrode serve as X and Y electrodes.

10. The electroluminescent display of claim 9 , wherein a width of the first mesh electrode layer is wider than a width of the second mesh electrode layer.

11. The electroluminescent display of claim 9 , wherein the first mesh electrode layer has a same width as the second mesh electrode layer.

12. The electroluminescent display of claim 9 , wherein a distance from the second mesh electrode layer to the common electrode is greater than a distance from the first mesh electrode layer to the common electrode.

13. The electroluminescent display of claim 12 , wherein the distance between the common electrode and the first mesh electrode layer is 3 μm to 30 μm, and a distance between the first mesh electrode layer and the second mesh electrode layer is 0.01 μm to 3 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

• G06F2203/04111

  Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate · CPC title