Electroluminescent display device

Patent metadata

Field	Value
Publication number	US-2023189551-A1
Application number	US-202217984999-A
Country	US
Kind code	A1
Filing date	Nov 10, 2022
Priority date	Dec 14, 2021
Publication date	Jun 15, 2023
Grant date	—

Abstract

An electroluminescent display device according to an embodiment of the present disclosure can include a substrate including a display area and a non-display area, a planarization layer disposed on an upper portion of the substrate, a bank disposed on the planarization layer, a stopper disposed on the bank in the non-display area, at least one trench pattern disposed outside the stopper and configured by removing a partial region of the bank such that the planarization layer is exposed, and a sealing layer disposed above the substrate. As a result, an overflow of an organic material layer is suppressed, such that a dam in the related art can be eliminated, and a bezel width can be reduced.

First claim

What is claimed is:

1 . An electroluminescent display device comprising:
a substrate including a display area and a non-display area; a planarization layer disposed on an upper portion of the substrate; a bank disposed on the planarization layer; a stopper disposed on the bank in the non-display area; at least one trench pattern disposed outside the stopper and configured by removing a partial region of the bank so that the planarization layer is exposed; and a sealing layer disposed above the substrate.

2 . An electroluminescent display device comprising:
a substrate including a display area and a non-display area; a planarization layer disposed on an upper portion of the substrate; a bank disposed on the planarization layer; an undercut provided in the bank in the non-display area; a stopper configured by the bank and disposed outside the undercut; at least one trench pattern disposed outside the stopper and configured by removing a partial region of the bank; and a sealing layer disposed above the substrate.

3 . The electroluminescent display device of claim 1 , further comprising:
a thin-film transistor disposed on the upper portion of the substrate in the display area; a first low-potential power line disposed on the upper portion of the substrate in the non-display area; and a protective layer disposed on the thin-film transistor and the first low-potential power line.

4 . The electroluminescent display device of claim 3 , wherein the planarization layer comprises:
a first planarization layer disposed on the protective layer; and a second planarization layer disposed on the first planarization layer.

5 . The electroluminescent display device of claim 4 , further comprising:
a second low-potential power line disposed on the first planarization layer in the non-display area and connected to the first low-potential power line; and a connection electrode disposed on the second planarization layer in the non-display area and connected to the second low-potential power line.

6 . The electroluminescent display device of claim 5 , wherein the second planarization layer is disposed to extend to a part of the non-display area so that a part of the first planarization layer is exposed, and
wherein a side surface of the second planarization layer extending to a part of the non-display area is inclined.

7 . The electroluminescent display device of claim 6 , further comprising:
an anode disposed on the second planarization layer in the display area; a light-emitting part provided on the anode and disposed to extend to a boundary between the display area and the non-display area; and a cathode disposed to extend to a part of the non-display area, configured to cover the light-emitting part, and electrically connected to the connection electrode.

8 . The electroluminescent display device of claim 6 , wherein the bank is disposed to extend to a part of the non-display area and inclined along the inclined side surface of the second planarization layer, and
wherein the at least one trench pattern is configured by removing a part of the bank adjacent to an inclined side surface of the bank so that the second planarization layer is exposed.

9 . The electroluminescent display device of claim 4 , wherein the at least one trench pattern is configured by removing a part of a thickness of the second planarization layer and the bank.

10 . The electroluminescent display device of claim 8 , wherein the sealing layer comprises:
a first inorganic material layer; an organic material layer disposed on the first inorganic material layer; and a second inorganic material layer disposed on the organic material layer, and wherein the first inorganic material layer extends to a part of the non-display area, and is disposed to cover a top surface and a side surface of the stopper and an inner surface of the at least one trench pattern.

11 . The electroluminescent display device of claim 10 , wherein the first inorganic material layer is disposed to cover the inclined side surface of the second planarization layer and the inclined bank, and
wherein the first inorganic material layer extending to a part of the non-display area is inclined along the inclined side surface of the second planarization layer.

12 . The electroluminescent display device of claim 10 , wherein the organic material layer is disposed to a position before the stopper.

13 . The electroluminescent display device of claim 10 , wherein the organic material layer is trapped in the at least one trench pattern even when the organic material layer flows over the stopper.

14 . The electroluminescent display device of claim 1 , wherein the at least one trench pattern is provided in the form of a quadrangular frame that surrounds the display area.

15 . The electroluminescent display device of claim 14 , wherein the stopper is provided in the form of a quadrangular frame that surrounds the display area.

16 . The electroluminescent display device of claim 14 , wherein the stopper has an inverted tapered shape.

17 . The electroluminescent display device of claim 1 , wherein the at least one trench pattern comprises:
a first trench pattern at an inner side; and a second trench pattern positioned at an outer side, and wherein the first trench pattern has a larger depth than the second trench pattern.

18 . The electroluminescent display device of claim 2 , wherein the undercut is configured in the bank by removing a part of the bank in the non-display area, and the bank comprises an eave structure configured above the undercut and protruding outward to cover the undercut.

19 . The electroluminescent display device of claim 18 , wherein the stopper is disposed to be spaced apart from the eave structure at a predetermined interval with an open hole interposed therebetween, and the open hole is provided outside the undercut.

20 . The electroluminescent display device of claim 2 , wherein the undercut and the stopper are each provided in the form of a quadrangular frame that surrounds the display area.

21 . The electroluminescent display device of claim 2 , wherein the sealing layer comprises:
a first inorganic material layer; an organic material layer disposed on the first inorganic material layer; and a second inorganic material layer disposed on the organic material layer, and wherein the electroluminescent display device further comprises an anti-overflow pattern configured by removing a part of a thickness of the first inorganic material layer disposed on an inner surface of the at least one trench pattern.

22 . The electroluminescent display device of claim 21 , wherein the anti-overflow pattern comprises:
a plurality of first anti-overflow patterns configured along the at least one trench pattern; and a second anti-overflow pattern disposed outside the plurality of first anti-overflow patterns and integrally configured along the at least one trench pattern.

23 . The electroluminescent display device of claim 22 , wherein the plurality of first anti-overflow patterns has different depths.

24 . The electroluminescent display device of claim 22 , wherein the first anti-overflow pattern and the second anti-overflow pattern are each provided in the form of a quadrangular frame that surrounds the stopper in the at least one trench pattern.

Assignees

• Lg Display Co Ltd

Inventors

• Chu Kyoyeol
• Byun Hyuntae

Classifications

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H01L51/5253 Primary

  Electricity · mapped topic

• H01L27/3246

  Electricity · mapped topic

• H10K59/873 Primary

  Encapsulations · CPC title

• H10K50/88

  Terminals, e.g. bond pads · CPC title