US 12,751,135 B2Granted

Display device, method for manufacturing display device, display module, and electronic device

AssigneeSemiconductor Energy Laboratory Co., Ltd.

InventorsShunpei Yamazaki, Ryota Hodo, Yasuhiro Jinbo

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Abstract

A highly reliable display device with high display quality is provided. The display device includes a first light-emitting element, a second light-emitting element provided to be adjacent to the first light-emitting element, a first protective layer, a second protective layer, and an insulating layer. The first light-emitting element includes a first pixel electrode, a first EL layer, and a common electrode, and the second light-emitting element includes a second pixel electrode, a second EL layer, and the common electrode. The first EL layer is provided over the first pixel electrode, and the second EL layer is provided over the second pixel electrode. The first protective layer includes a region in contact with the side surface of the first EL layer, and the second protective layer includes a region in contact with the side surface of the second EL layer. The insulating layer is provided between the first protective layer and the second protective layer. The common electrode is provided over the first EL layer, over the second EL layer, over the first protective layer, over the second protective layer, and over the insulating layer.

Claims16

Dependent claims

A display device comprising:

a first light-emitting element;
a second light-emitting element positioned to be adjacent to the first light-emitting element;
a first protective layer;
a second protective layer;
and
an insulating layer,
wherein the first light-emitting element comprises a first pixel electrode, a first EL layer, a common layer, and a common electrode,
wherein the second light-emitting element comprises a second pixel electrode, a second EL layer, the common layer, and the common electrode,
wherein the first EL layer is provided over the first pixel electrode,
wherein the second EL layer is provided over the second pixel electrode,
wherein the first protective layer comprises a region in contact with a side surface of the first EL layer,
wherein the second protective layer comprises a region in contact with a side surface of the second EL layer,
wherein the insulating layer is provided between the first protective layer and the second protective layer,
wherein the common electrode is provided over each of the first EL layer, the second EL layer, the first protective layer, the second protective layer, and the insulating layer with the common layer therebetween, and
wherein the common layer comprises at least one of a hole-injection layer, a hole-transport layer, a hole-blocking layer, an electron-blocking layer, an electron-transport layer, or an electron-injection layer in the first light-emitting element and the second light-emitting element.

12 more elements

A method for manufacturing a display device, comprising:

forming a first pixel electrode and a second pixel electrode over an insulating surface;
forming a first EL film and a first sacrificial film in this order over each of the first pixel electrode and the second pixel electrode;
processing the first sacrificial film and the first EL film to form a first sacrificial layer and a first EL layer each of which comprises a region overlapping with the first pixel electrode;
forming a first protective film covering at least a side surface of the first EL layer and a side surface and a top surface of the first sacrificial layer;
processing the first protective film to form a first protective layer comprising a region in contact with at least the side surface of the first EL layer;
forming a second EL film and a second sacrificial film in this order over each of the first sacrificial layer and the second pixel electrode;
processing the second sacrificial film and the second EL film to form a second sacrificial layer and a second EL layer each of which comprises a region overlapping with the second pixel electrode;
forming a second protective film covering at least a side surface of the second EL layer and a side surface and a top surface of the second sacrificial layer;
processing the second protective film to form a second protective layer comprising a region in contact with at least the side surface of the second EL layer;
forming an insulating film covering at least the top surface of the first sacrificial layer, the top surface of the second sacrificial layer, a side surface of the first protective layer, and a side surface of the second protective layer;
processing the insulating film to form an insulating layer between the first protective layer and the second protective layer;
removing the first sacrificial layer and the second sacrificial layer;
and
forming a common electrode over each of the first EL layer, the second EL layer, the first protective layer, the second protective layer, and the insulating layer.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/280,518Filed 15 Mar 2022
Priority: JP 2021-05222525 Mar 2021
Published: US 2024/0130159 A118 Apr 2024
Granted: 29 Sep 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

H10K 50/19
OLEDs or polymer light-emitting diodes [PLED]: tandem OLEDs
G09F 9/30
Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual…
H05B 33/06
Details: electrode terminals
H05B 33/10
Electroluminescent light sources: apparatus or processes specially adapted to the manufacture of electroluminescent light sources