Light emitting display apparatus

Patent metadata

Field	Value
Publication number	US-12557478-B2
Application number	US-202217977819-A
Country	US
Kind code	B2
Filing date	Oct 31, 2022
Priority date	Dec 31, 2021
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

A light emitting display apparatus includes a planarization layer provided in a substrate, a plurality of anodes provided on the planarization layer, a bank including opening regions exposing the anodes, a light emitting layer provided on the plurality of anodes and the bank, and a cathode provided on the light emitting layer, the cathode including a boundary region cathode and a main cathode, wherein a boundary groove is at an outer portion of each of the plurality of anodes.

First claim

What is claimed is:

1 . A light emitting display apparatus comprising:
a planarization layer on a substrate; a plurality of anodes on the planarization layer; a bank including a plurality of opening regions exposing the plurality of anodes; a light emitting layer on the plurality of anodes and the bank; and a cathode on the light emitting layer, the cathode including a boundary region cathode and a main cathode, wherein a boundary groove is located at an outer portion of each of the plurality of anodes, the boundary groove including a first boundary groove located between pixels arranged in a first direction of the substrate, and a second boundary groove located between pixels arranged in a second direction that is different from the first direction, wherein the bank comprises: a first bank including a first material that covers the first boundary groove in the planarization layer; and a second bank including a second material that is different from the first material of the first bank, the second bank covering the second boundary groove in the planarization layer, wherein the first boundary groove includes an undercut, the boundary region cathode isolated from the main cathode in the first boundary groove by the undercut.

2 . The light emitting display apparatus of claim 1 , wherein the boundary region cathode is in the first boundary groove, and the main cathode is in the plurality of opening regions and the second boundary groove.

3 . The light emitting display apparatus of claim 1 , wherein the boundary region cathode is located between pixels arranged in the first direction that is parallel to a gate line that is on the substrate.

4 . The light emitting display apparatus of claim 1 , wherein the light emitting layer comprises:
a boundary region light emitting layer in the first boundary groove; and a main light emitting layer in the plurality of opening regions and the second boundary groove, and wherein the boundary region light emitting layer and the main light emitting layer are isolated from each other in the first boundary groove by the undercut.

5 . The light emitting display apparatus of claim 4 , wherein the undercut is in the first boundary groove that is located between a pair of anodes that are adjacent to each other in the first direction.

6 . The light emitting display apparatus of claim 4 , wherein the boundary region light emitting layer and the main emitting layer are connected to each other in a region between pixels adjacent to each other in the second direction.

7 . The light emitting display apparatus of claim 1 , wherein a height of the planarization layer in the first boundary groove and a height of the planarization layer in the second boundary groove is less than a height of the planarization layer in a region outside of the first boundary groove and the second boundary groove.

8 . The light emitting display apparatus of claim 4 , wherein the first bank is on the planarization layer in the first boundary groove, the boundary region light emitting layer is on the first bank in the first boundary groove, and the boundary region cathode is on the boundary region light emitting layer in the first boundary groove.

9 . The light emitting display apparatus of claim 8 , wherein an end of an anode from the plurality of anodes protrudes toward the first boundary groove past a lateral surface of the planarization layer, and the undercut is between the planarization layer and the end of the anode protruding toward the first boundary groove.

10 . The light emitting display apparatus of claim 4 , wherein the second bank is on the planarization layer in the second boundary groove, the main light emitting layer is on the second bank in the second boundary groove, and the main cathode is on the main light emitting layer in the second boundary groove.

11 . The light emitting display apparatus of claim 4 , wherein the first bank is on the planarization layer in the second boundary groove such that the first bank is between the second boundary groove and the planarization layer in the second boundary groove, the main light emitting layer is on the second bank in the second boundary groove, and the main cathode is on the main light emitting layer in the second boundary groove.

12 . The light emitting display apparatus of claim 11 , wherein the first bank in the second boundary groove covers a portion of an anode from the plurality of anodes that extends toward the second boundary groove past a lateral surface of the second boundary groove.

13 . The light emitting display apparatus of claim 1 , wherein the first material of first bank comprises an inorganic material and the second material of the second bank comprises an organic material.

14 . The light emitting display apparatus of claim 1 , wherein the second boundary groove is from a plurality of second boundary grooves that are between pixels arranged in the second direction, and the second bank is not in at least one of the plurality of second boundary grooves.

15 . The light emitting display apparatus of claim 14 , wherein the planarization layer is exposed at the at least one of the plurality of second boundary grooves that lacks the second bank.

16 . The light emitting display apparatus of claim 14 , wherein the at least one of the plurality of second boundary grooves that lacks the second bank includes an undercut that isolates the boundary region cathode from the main cathode in the at least one of the plurality of second boundary grooves.

17 . The light emitting display apparatus of claim 1 , wherein the first boundary groove is from a plurality of first boundary grooves that are between pixels arranged in the first direction, and the second bank is in at least one of first boundary grooves.

18 . The light emitting display apparatus of claim 17 , wherein one of the first boundary grooves from the plurality of first boundary grooves that lacks the second bank also lacks an undercut that isolates the boundary region cathode from the main cathode, and
the at least one of first boundary grooves that includes the second bank includes an undercut that isolates the boundary region cathode from the main cathode in the at least one of the first boundary grooves.

19 . A light emitting display apparatus comprising:
a substrate; a planarization layer on the substrate; a plurality of pixels on the planarization layer including a first pixel, a second pixel, and a third pixel, the first pixel and the second pixel adjacent to each other in a first direction, and the first pixel and the third pixel adjacent to each other in a second direction that is different from the first direction; a first boundary groove in the planarization layer, the first boundary groove between the first pixel and the second pixel; a second boundary groove in the planarization layer, the second boundary groove between the first pixel and the third pixel; and a plurality of banks that define light emission regions of the plurality of pixels, the plurality of banks including a first bank that is in the first boundary groove and a second bank that is in the second boundary groove, wherein a thickness of the first bank in the first boundary groove is less than a thickness of the second bank in the second boundary groove, and a third direction, which is a thickness direction, is a direction perpendicular to the first direction and the second direction.

20 . The light emitting display apparatus of claim 19 , wherein the first pixel incl

Assignees

• Lg Display Co Ltd

Inventors

• Seong Sejong
• Kim Seungkyeom
• Lee Soyoung

Classifications

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• H10K59/1213

  the pixel elements being TFTs · CPC title

• H10K59/131

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

• H10K50/81

  Anodes · CPC title