IP Library Granted Patent US 12,396,320
Granted Patent B2
US 12,396,320 · App. 17/987,861 · Granted Aug 19, 2025

Display device

Inventor: Nobuto Managaki (Tokyo, JP)
Assignee: Magnolia White Corporation
H10K50/822H10K50/16H10K59/80521H10K2102/351
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12,396,320
App. No.
17/987,861
Granted
Aug 19, 2025
Kind
B2
Abstract

According to one embodiment, in a display device, end portions of a hole-transport layer, a light emitting layer and an electron-transport layer provided in a pixel are spaced apart from end portions of applicable layers of an adjacent pixel. The electron-transport layer includes a first area and a second area having a film thickness greater than that of the first area. The second area overlaps a common electrode, and the first area does not overlap the common electrode.

Claims (14)

1. A display device comprising a pixel comprising a pixel electrode, a hole-transport layer, a light emitting layer, an electron-transport layer and a common electrode, wherein

end portions of the hole-transport layer, the light emitting layer and the electron-transport layer provided in the pixel are spaced apart from end portions of a hole-transport layer, a light emitting layer and an electron-transport layer of an adjacent pixel,

the electron-transport layer comprises a first area having a first film thickness, and a second area having a second film thickness greater than the first film thickness, and

the second area overlaps the common electrode, and the first area does not overlap the common electrode.

2. The display device according to claim 1 , wherein

the second area and the common electrode have a rectangular shape in plan view.

3. The display device according to claim 1 , wherein

the second area and the common electrode have a circular shape in plan view.

4. The display device according to claim 3 , wherein

a diameter of the circular shape is greater than or equal to 3 μm and less than or equal to 10 μm.

5. The display device according to claim 4 , wherein

the diameter of the circular shape is greater than or equal to 1 μm and less than or equal to 3 μm.

6. The display device according to claim 1 , wherein

the first film thickness is 10% of the second film thickness.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 27, 2025
From: JAPAN DISPLAY INC.
To: MAGNOLIA WHITE CORPORATION
Reel/Frame 071741/0492 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 16, 2022
From: MANAGAKI, NOBUTO
To: JAPAN DISPLAY INC.
Reel/Frame 061787/0636 →
Priority Claims (1)
JP 2021-187175 · Nov 17, 2021 · national
Continuity (1)
Related Publication 20230157051A1 · May 18, 2023
References Cited (8)
US 20070188081A1 · Lee · 2007 [cited by examiner]
US 20090051275A1 · Kobayashi · 2009 [cited by examiner]
US 20160155978A1 · Park · 2016 [cited by examiner]
US 20160248035A1 · Hwang · 2016 [cited by examiner]
US 20170229675A1 · Riedel · 2017 [cited by examiner]
US 20200035760A1 · Park · 2020 [cited by examiner]
US 20210143357A1 · Katsushi · 2021 [cited by examiner]
JP 11307270A · 1999 [cited by applicant]