Electroluminescent display device

Patent metadata

Field	Value
Publication number	US-2024130208-A1
Application number	US-202318236470-A
Country	US
Kind code	A1
Filing date	Aug 22, 2023
Priority date	Oct 17, 2022
Publication date	Apr 18, 2024
Grant date	—

Abstract

An electroluminescent display device includes a display part configured to display an image. Also, the electroluminescent display device includes an encapsulation unit disposed over the display part and a heat dissipation sheet disposed over the encapsulation unit. The encapsulation unit includes a sealing member composed of a first adhesive layer, a second adhesive layer, and a barrier layer between the first adhesive layer and the second adhesive layer. Further, the encapsulation unit includes a hole in the second adhesive layer and the barrier layer. A side surface of the barrier layer may be electrically connected to the heat dissipation sheet through a conductive paste injected into the hole. Thus, it is possible to improve electromagnetic interference.

First claim

What is claimed is:

1 . An electroluminescent display device, comprising:
a display part configured to display an image; an encapsulation unit disposed over the display part; and a heat dissipation sheet disposed over the encapsulation unit, wherein the encapsulation unit includes a sealing member including a first adhesive layer, a second adhesive layer, a barrier layer disposed between the first adhesive layer and the second adhesive layer, and a hole formed in the second adhesive layer and the barrier layer, and wherein a side surface of the barrier layer is electrically connected to the heat dissipation sheet through a conductive paste injected into the hole.

2 . The electroluminescent display device according to claim 1 , wherein a part of the first adhesive layer is pressed into the hole and protrudes convexly into the hole.

3 . The electroluminescent display device according to claim 1 , wherein the first adhesive layer and the second adhesive layer are made of a polymer material having adhesiveness.

4 . The electroluminescent display device according to claim 1 , wherein the barrier layer is made of a metal material.

5 . The electroluminescent display device according to claim 1 , further comprising a reinforcing substrate disposed over the sealing member,
wherein the reinforcing substrate has a hole.

6 . The electroluminescent display device according to claim 5 , wherein the reinforcing substrate is made of a plastic polymer material.

7 . The electroluminescent display device according to claim 1 , wherein the conductive paste includes a silver paste.

8 . The electroluminescent display device according to claim 5 , wherein the conductive paste is coated onto a part of an upper surface of the reinforcing substrate.

9 . The electroluminescent display device according to claim 1 , further comprising a conductive tape attached to an upper surface of the encapsulation unit and covering the conductive paste.

10 . The electroluminescent display device according to claim 5 , wherein a part of a lower end of the reinforcing substrate is pressed upwards so that a space having a greater diameter than the hole is formed.

11 . The electroluminescent display device according to claim 10 , wherein the second adhesive layer fills in the space having the greater diameter than the hole between an inner surface of the reinforcing substrate and the hole.

12 . The electroluminescent display device according to claim 1 , wherein the display part includes:
a substrate including an active area and a non-active area; a driving element disposed over the substrate; a planarization layer disposed over the driving element; and a light emitting diode disposed over the planarization layer and electrically connected to the driving element.

13 . The electroluminescent display device according to claim 9 , wherein the hole is located closer to an active area for displaying the image in the display part than the heat dissipation sheet.

14 . The electroluminescent display device according to claim 13 , wherein the conductive tape is located closer to the active area than the heat dissipation sheet.

15 . The electroluminescent display device according to claim 9 , wherein the hole is located farther from an active area for displaying the image in the display part than the heat dissipation sheet.

16 . The electroluminescent display device according to claim 15 , wherein the conductive tape is located farther from the active area than the heat dissipation sheet.

17 . The electroluminescent display device according to claim 9 , wherein the hole is located in an active area for displaying the image in the display part.

18 . The electroluminescent display device according to claim 1 , further comprising a pad and a driving IC disposed over the heat dissipation sheet.

19 . The electroluminescent display device according to claim 18 , further comprising a flexible film attached to a tip end of the display part and covering the pad and the driving IC.

20 . The electroluminescent display device according to claim 19 , further comprising:
a sealant coated onto a side surface of the display part; and a moisture-proof resin coated onto a bonding portion between the display part and the flexible film.

Assignees

• Lg Display Co Ltd

Inventors

• Kang Minjoo
• Kim Seongjun

Classifications

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/8794 Primary

  Arrangements for heating and cooling · CPC title

• H10K59/873 Primary

  Encapsulations · CPC title

• H10K59/131

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

• H10K59/123

  Connection of the pixel electrodes to the thin film transistors [TFT] · CPC title