US-12628500-B2 - Organic light emitting display panel and organic light emitting display device

US12628500B2US 12628500 B2US12628500 B2US 12628500B2US-12628500-B2

Abstract

An organic light emitting display panel and an organic light emitting display device including the panel are discussed. The organic light emitting display device can include a planarization layer disposed on a substrate, a first electrode disposed on a portion of an upper surface of the planarization layer, a protective pattern surrounding a portion of an upper surface and a side surface of the first electrode, a bank disposed to expose the portion of the upper surface of the first electrode and to be in contact with the portion of the upper surface of the planarization layer while surrounding the protective pattern, a light emitting layer disposed on the bank and disposed on the upper surface of the first electrode that does not overlap the bank, and a second electrode disposed on the light emitting layer. The display device is capable of preventing the first electrode from being contaminated by foreign substances.

Inventors

Wonrae Kim
Seonghan HWANG
Juhyuk KIM

Assignees

LG DISPLAY CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20221116
Priority Date: 20211231

Claims (18)

1 . An organic light emitting display device, comprising: a planarization layer disposed on a substrate; a first electrode disposed on a portion of an upper surface of the planarization layer; a protective pattern disposed on a portion of an upper surface of the first electrode; a bank disposed to expose the portion of the upper surface of the first electrode, and to be in contact with the portion of the upper surface of the planarization layer while surrounding the protective pattern; a light emitting layer disposed on the bank and disposed on the upper surface of the first electrode that does not overlap the bank; and a second electrode disposed on the light emitting layer, wherein a height from the upper surface of the planarization layer to an upper surface of the bank in an area where a lower portion of the bank is in contact with the planarization layer is lower than a height from the upper surface of the planarization layer to an upper surface of the bank in an area where the bank overlaps the protective pattern.
2 . The organic light emitting display device of claim 1 , wherein the bank comprises a colored organic insulating material.
3 . The organic light emitting display device of claim 1 , wherein the protective pattern surrounds a side surface of the first electrode.
4 . The organic light emitting display device of claim 1 , wherein a height from the upper surface of the planarization layer to an upper surface of the bank in an area where the bank overlaps the protective pattern is proportional to a height of the protective pattern.
5 . The organic light emitting display device of claim 1 , wherein a slope of a side surface of the bank in an area where the bank overlaps the protective pattern increases as a height of the protective pattern increases.
6 . The organic light emitting display device of claim 1 , wherein at least a portion of a side surface of the protective pattern has a reverse tapered shape.
7 . The organic light emitting display device of claim 6 , wherein the side surface of the protective pattern in an area in which the protective pattern overlaps the first electrode has a reverse tapered shape.
8 . The organic light emitting display device of claim 1 , wherein a slope of a side surface of the protective pattern in an area overlapping the first electrode is greater than a slope of a side surface of the protective pattern in an area in which the protective pattern is not overlapped with the first electrode.
9 . The organic light emitting display device of claim 1 , wherein the bank is disposed to expose at least a portion of a side surface of the protective pattern in an area in which the protective pattern overlaps the first electrode.
10 . The organic light emitting display device of claim 1 , wherein a mixed area is provided in which a material of the protective pattern and a material of the bank are mixed, and the mixed area in which the protective pattern and the bank overlap the first electrode.
11 . The organic light emitting display device of claim 10 , wherein the bank surrounds the mixed area, and a boundary is formed between the mixed area and a bank area in which the bank is located.
12 . The organic light emitting display device of claim 1 , wherein the protective pattern is disposed in a non-emission area.
13 . The organic light emitting display device of claim 1 , wherein a height of the protective pattern is greater than a height of the first electrode, and is equal to or lower than a height of the bank in an area where the bank does not overlap the protective pattern.
14 . The organic light emitting display device of claim 13 , wherein the protective pattern has a thickness of about 700 nm to about 1.8 μm.
15 . An organic light emitting display panel, comprising: a substrate comprising an emission area and a non-emission area adjacent to the emission area; a planarization layer disposed on the substrate; a first electrode disposed on a portion of an upper surface of the planarization layer; a protective pattern surrounding a portion of an upper surface and a side surface of the first electrode, and disposed in the non-emission area; a bank disposed to expose the portion of the upper surface of the first electrode, and to be in contact with the portion of the upper surface of the planarization layer while surrounding the protective pattern; a light emitting layer disposed on the bank and disposed on the upper surface of the first electrode that does not overlap the bank; and a second electrode disposed on the light emitting layer, wherein a slope of a side surface of the bank in an area where the bank overlaps the protective pattern increases as a height of the protective pattern increases.
16 . The organic light emitting display panel of claim 15 , wherein the protective pattern comprises a transparent organic insulating material, or the bank comprises a colored organic insulating material.
17 . The organic light emitting display panel of claim 15 , wherein the bank is disposed to expose at least a portion of a side surface of the protective pattern in an area overlapping the first electrode.
18 . The organic light emitting display panel of claim 15 , wherein the protective pattern comprises a transparent organic insulating material.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority under 35 U.S.C. § 119(a) to Korean Patent Application No. 10-2021-0194686, filed in the Republic of Korea on Dec. 31, 2021, the entire contents of which are hereby expressly incorporated by reference into the present application. BACKGROUND OF THE DISCLOSURE Technical Field Embodiments of the disclosure relate to an organic light emitting display panel and an organic light emitting display device including the organic light emitting display panel. Description of the Related Art A display device is an output device for presentation of information in visual and plays a key role in the information age. Display devices are evolving to deliver a higher performance while being slimmer, lighter, and portable. Among flat panel displays which are much lighter and less bulky than cathode-ray tubes (CRTs), an organic light emitting display (OLED) device gains popularity that displays images by controlling the amount of light emitted by a light emitting layer. In the process of manufacturing the organic light emitting display (OLED) device, contamination sources such as foreign substances can be generated, which may cause issues in an organic light emitting element. BRIEF SUMMARY OF THE DISCLOSURE Embodiments of the disclosure relate to an organic light emitting display panel having improved reliability by preventing foreign substances from existing on the electrodes of an organic light emitting element, and to an organic light emitting display device including such display panel. Embodiments of the disclosure relate to the organic light emitting display panel having the organic light emitting element where an angle between a side surface and a horizontal surface of a bank is easily adjusted to make the thickness of an organic layer constant, thereby improving luminous efficiency, and relate to the organic light emitting display device having such display panel. According to embodiments of the disclosure, there can be provided an organic light emitting display device, including a planarization layer disposed on a substrate, a first electrode disposed on a portion of an upper surface of the planarization layer, a protective pattern disposed on a portion of an upper surface of the first electrode, a bank disposed to expose the portion of the upper surface of the first electrode and to be in contact with the portion of the upper surface of the planarization layer while surrounding the protective pattern, a light emitting layer disposed on the bank and disposed on the upper surface of the first electrode that does not overlap the bank, and a second electrode disposed on the light emitting layer. According to embodiments of the disclosure, there can be provided an organic light emitting display panel, including a substrate comprising an emission area and a non-emission area adjacent to the emission area, a planarization layer disposed on the substrate, a first electrode disposed on a portion of an upper surface of the planarization layer, a protective pattern surrounding a portion of an upper surface and a side surface of the first electrode and disposed in the non-emission area, a bank disposed to expose the portion of the upper surface of the first electrode and to be in contact with the portion of the upper surface of the planarization layer while surrounding the protective pattern, a light emitting layer disposed on the bank and disposed on the upper surface of the first electrode that does not overlap the bank, and a second electrode disposed on the light emitting layer. According to embodiments of the disclosure, there can be provided the organic light emitting display panel having improved reliability without the foreign substances existing on the electrodes of the organic light emitting element, and the organic light emitting display device having such display penal. According to embodiments of the disclosure, there can be provided the organic light emitting display panel having the organic light emitting element where the angle between the side surface and the horizontal surface of the bank can be easily adjusted to make the thickness of the organic layer constant, thereby improving luminous efficiency, and the organic light emitting display device having such display panel. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the disclosure will be more clearly understood from the following detailed description, taken in conjunction with the accompanying drawings, in which: FIG. 1 is a view schematically illustrating a system configuration of an organic light emitting display device according to embodiments of the disclosure; FIG. 2 is a cross-sectional view schematically illustrating a structure of one sub-pixel area of the organic light emitting display device according to embodiments of the disclosure; FIGS. 3 to 10 are schematic views of the process of forming a first electrode, a protective pattern, a