US 12,765,185 B2Granted

Display device with a groove overlapping pixel electrodes and methods for fabricating the same

AssigneeSemiconductor Energy Laboratory Co., Ltd.

InventorsYuichi Yanagisawa, Ryota Hodo, Hiromi Sawai

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Abstract

A high-resolution display device and a fabrication method thereof are provided. The display device includes a first insulating layer, a second insulating layer, a first light-emitting element, a second light-emitting element, and a resin layer. The first light-emitting element includes a first pixel electrode, a first organic layer, and a common electrode, and the second light-emitting element includes a second pixel electrode, a second organic layer, and the common electrode. The first insulator has a groove. The groove has a region overlapping with the first pixel electrode and a region overlapping with the second pixel electrode. The second insulating layer has a region in contact with part of the top surface of the first organic layer, a region in contact with the side surface of the first organic layer, and a region in contact with the first insulating layer below the first pixel electrode. The resin layer is positioned between the first organic layer and the second organic layer. The common electrode is provided to cover the top surface of the resin layer.

Claims8

Dependent claims

A display device comprising:

a first insulating layer;
a first light-emitting element and a second light-emitting element over the first insulating layer;
a second insulating layer;
a third insulating layer;
and
a resin layer,
wherein the first light-emitting element comprises a first pixel electrode, a first organic layer and a common electrode,
wherein the second light-emitting element comprises a second pixel electrode, a second organic layer and the common electrode,
wherein the first light-emitting element and the second light-emitting element are configured to emit light of different colors,
wherein the first insulating layer comprises a groove,
wherein the groove comprises:
a region overlapping with the first pixel electrode;
a region overlapping with the second pixel electrode;
and
a region overlapping with neither the first pixel electrode nor the second pixel electrode,
wherein the second insulating layer comprises:
a region in contact with at least a part of a top surface of the first organic layer;
a region in contact with a side surface of the first organic layer;
and
a region in contact with the first insulating layer below the first pixel electrode,
wherein the third insulating layer comprises:
a region in contact with at least a part of a top surface of the second organic layer;
a region in contact with a side surface of the second organic layer;
and
a region in contact with the first insulating layer below the second pixel electrode,
wherein the resin layer comprises a region in contact with the first insulating layer in a portion between the first organic layer and the second organic layer, and
wherein the common electrode covers a top surface of the resin layer.

24 more elements

A method for fabricating a display device comprising the steps of:

forming a first pixel electrode and a second pixel electrode over a first insulating layer;
processing the first insulating layer by an isotropic etching method to form a groove in the first insulating layer, wherein the groove comprises a region overlapping with the first pixel electrode, a region overlapping with the second pixel electrode, and a region overlapping with neither the first pixel electrode nor the second pixel electrode;
forming a first organic layer over the first pixel electrode by forming a film comprising a first light-emitting compound over the first pixel electrode and the first insulating layer;
forming a second insulating layer over the first organic layer;
forming a second organic layer over the second pixel electrode by forming a film comprising a second light-emitting compound over the second pixel electrode and the first insulating layer;
forming a third insulating layer over the second organic layer;
forming a resin layer over the first insulating layer, the second insulating layer, and the third insulating layer;
forming a first opening portion reaching the first organic layer in the resin layer and the second insulating layer and a second opening portion reaching the second organic layer in the resin layer and the third insulating layer by removing a part of the resin layer, a part of the second insulating layer, and a part of the third insulating layer;
and
forming a common electrode after forming the first opening portion,
wherein the common electrode and the first organic layer overlap each other in the first opening portion,
wherein the common electrode and the second organic layer overlap each other in the second opening portion,
wherein the first pixel electrode, the first organic layer and the common electrode are included in a first light-emitting element,
wherein the second pixel electrode, the second organic layer and the common electrode are included in a second light-emitting element, and
wherein the first light-emitting element and the second light-emitting element are configured to emit light of different colors from each other.

12 more elements

A method for fabricating a display device comprising the steps of:

forming a first pixel electrode and a second pixel electrode over a first insulating layer;
processing the first insulating layer by an isotropic etching method to form a groove in the first insulating layer, wherein the groove comprises a region overlapping with the first pixel electrode, a region overlapping with the second pixel electrode, and a region overlapping with neither the first pixel electrode nor the second pixel electrode;
forming a first resist mask in a part of the groove and a portion overlapping with the second pixel electrode;
forming a first organic layer over the first pixel electrode and a first layer over the first resist mask by forming a film comprising a first light-emitting compound over the first pixel electrode, the first insulating layer, and the first resist mask;
forming a second insulating layer over the first organic layer;
removing the first resist mask and the first layer;
forming a second resist mask over the second insulating layer;
forming a second organic layer over the second pixel electrode and a second layer over the second resist mask by forming a film comprising a second light-emitting compound over the second pixel electrode, the first insulating layer, and the second resist mask;
forming a third insulating layer over the second organic layer;
removing the second resist mask and the second layer;
forming a resin layer over the first insulating layer, the second insulating layer, and the third insulating layer;
forming a first opening portion reaching the first organic layer in the resin layer and the second insulating layer and a second opening portion reaching the second organic layer in the resin layer and the third insulating layer by removing a part of the resin layer, a part of the second insulating layer, and a part of the third insulating layer;
and
forming a common electrode after forming the first opening portion,
wherein the common electrode and the first organic layer overlap each other in the first opening portion,
wherein the common electrode and the second organic layer overlap each other in the second opening portion,
wherein the first pixel electrode, the first organic layer and the common electrode are included in a first light-emitting element,
wherein the second pixel electrode, the second organic layer and the common electrode are included in a second light-emitting element, and
wherein the first light-emitting element and the second light-emitting element are configured to emit light of different colors from each other.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/702,404Filed 13 Oct 2022
Priority: JP 2021-17577027 Oct 2021
Published: US 2024/0423026 A119 Dec 2024
Granted: 13 Oct 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H10K 59/122
Active-matrix OLED [AMOLED] displays: pixel-defining structures or layers, e.g. banks
H10K 59/1201
Active-matrix OLED [AMOLED] displays: manufacture or treatment
H10K 59/124
Active-matrix OLED [AMOLED] displays: insulating layers formed between TFT elements and OLED elements
H10K
Organic electric solid-state devices