IP Library › Granted Patent US 12,660,476
Granted Patent B2
US 12,660,476 · App. 18/273,070 · Granted Jun 16, 2026

Display device

Inventors: Daiki Nakamura (Atsugi, JP); Sho Kato (Isehara, JP); Kenichi Okazaki (Atsugi, JP); Shunpei Yamazaki (Tokyo, JP)
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
H10K59/80522H10K50/13H10K50/171H10K59/131H10K59/353H10K59/8791H10K2102/351
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Quick Facts
Patent No.
US 12,660,476
App. No.
18/273,070
Granted
Jun 16, 2026
Kind
B2
Abstract

A display device with both high display quality and high resolution is provided. The display device includes a light-emitting element and a connection portion. The connection portion is provided along an outer periphery of a display region where the light-emitting element is provided. The light-emitting element includes a pixel electrode, a first EL layer over the pixel electrode, a second EL layer over the first EL layer, and a common electrode over the second EL layer. The connection portion includes a connection electrode, a second EL layer over the connection electrode, and the common electrode over the second EL layer. The second EL layer includes a first region in contact with the connection electrode and a second region in contact with the common electrode. The area of a region where the first region and the second region overlap with each other in a top view is greater than or equal to 40000 square micrometers. The second EL layer includes a region where the film thickness is greater than or equal to 0.5 nm and less than or equal to 1.5 nm. The second EL layer contains a substance with a high electron-injection property.

Claims (34)

1 . A display device comprising:

a display portion comprising a first light-emitting element and a second light-emitting element arranged side by side; and

a connection portion outside the display portion,

wherein the first light-emitting element comprises a first pixel electrode, a first EL layer over the first pixel electrode, a second EL layer over the first EL layer, and a common electrode over the second EL layer,

wherein the second light-emitting element comprises a second pixel electrode, a third EL layer over the second pixel electrode, the second EL layer over the third EL layer, and the common electrode over the third EL layer,

wherein the connection portion comprises a connection electrode, the second EL layer over the connection electrode, and the common electrode over the second EL layer,

wherein the second EL layer comprises a region where a film thickness is greater than or equal to 0.5 nm and less than or equal to 1.5 nm,

wherein the second EL layer comprises a substance with a high electron-injection property, and

wherein in a plan view, the connection electrode comprises a region provided along the first pixel electrode and the second pixel electrode.

2 . A display device comprising:

a display portion comprising a first light-emitting element and a second light-emitting element arranged side by side; and

a connection portion outside the display portion,

wherein the first light-emitting element comprises a first pixel electrode, an insulating layer over the first pixel electrode, a first EL layer over the first pixel electrode and over the insulating layer, a second EL layer over the first EL layer, and a common electrode over the second EL layer,

wherein the second light-emitting element comprises a second pixel electrode, the insulating layer over the second pixel electrode, a third EL layer over the second pixel electrode, the second EL layer over the third EL layer, and the common electrode over the third EL layer,

wherein the connection portion comprises a connection electrode, the insulating layer over the connection electrode, the second EL layer over the connection electrode and over the insulating layer, and the common electrode over the second EL layer,

wherein the second EL layer comprises a region where a film thickness is greater than or equal to 0.5 nm and less than or equal to 1.5 nm,

wherein the second EL layer comprises a substance with a high electron-injection property, and

wherein in a plan view, the connection electrode comprises a region provided along at least two sides of an outer periphery of the display portion.

3 . The display device according to claim 2 ,

wherein the first EL layer comprises a region in contact with the first pixel electrode through an opening included in the insulating layer.

4 . The display device according to claim 1 ,

wherein the first EL layer comprises a light-emitting compound, and

wherein the second EL layer comprises lithium fluoride.

5 . The display device according to claim 1 ,

wherein the connection portion comprises a top-surface shape with a comb-like shape or a slit.

6 . The display device according to claim 2 ,

wherein the first EL layer comprises a light-emitting compound, and

wherein the second EL layer comprises lithium fluoride.

7 . The display device according to claim 2 ,

wherein the connection portion comprises a top-surface shape with a comb-like shape or a slit.

8 . The display device according to claim 1 ,

wherein an area of a region where the second EL layer is in contact with a top surface of the connection electrode and a bottom surface of the common electrode is greater than or equal to 40000 μm 2 .

9 . The display device according to claim 2 ,

wherein an area of a region where the second EL layer is in contact with a top surface of the connection electrode and a bottom surface of the common electrode is greater than or equal to 40000 μm 2 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 19, 2023
From: NAKAMURA, DAIKI; KATO, SHO; OKAZAKI, KENICHI; YAMAZAKI, SHUNPEI
To: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Reel/Frame 064310/0340 →
Priority Claims (1)
JP 2021-011385 · Jan 27, 2021 · national
Continuity (1)
Related Publication 20240130204A1 · Apr 18, 2024
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