Granted Patent B2

US 12,538,664 · App. 18/169,882 · Granted Jan 27, 2026

Inventor: Kaichi Fukuda (Tokyo, JP)

Assignee: MAGNOLIA WHITE CORPORATION

H10K59/122H10K59/80515H10K59/80523H10K59/35

Abstract

Claims (36)

1 . A display device comprising:

a first sub-pixel including a first lower electrode, a first upper electrode opposed to the first lower electrode, and a first organic layer located between the first lower electrode and the first upper electrode to emit red light in accordance with a potential difference between the first lower electrode and the first upper electrode;

a second sub-pixel including a second lower electrode, a second upper electrode opposed to the second lower electrode, and a second organic layer located between the second lower electrode and the second upper electrode to emit blue light in accordance with a potential difference between the second lower electrode and the second upper electrode;

a rib covering a part of the first lower electrode and a part of the second lower electrode, and including a first aperture that overlaps with the first lower electrode and a second aperture that overlaps with the second lower electrode; and

a partition including a lower portion arranged on the rib and an upper portion protruding from a side surface of the lower portion,

wherein

the first upper electrode and the second upper electrode each include a first layer and a second layer covering the first layer,

an end portion of the first layer is in contact with the side surface of the lower portion,

in each of the first upper electrode and the second upper electrode, the second layer covers the end portion of the first layer and is in contact with the side surface of the lower portion,

in each of the first upper electrode and the second upper electrode, the first layer is formed of a metallic material and the second layer is formed of a conductive oxide,

the second layer of the first upper electrode is thicker than the second layer of the second upper electrode, and

a thickness of the first layer of the first upper electrode is identical to that of the second upper electrode.

2 . The display device of claim 1 , wherein

in each of the first upper electrode and the second upper electrode, the second layer is thicker than the first layer.

3 . The display device of claim 1 , wherein

in each of the first upper electrode and the second upper electrode, the first layer is formed of an alloy containing magnesium and silver.

4 . The display device of claim 1 , wherein

in each of the first upper electrode and the second upper electrode, the second layer is formed of ITO or IZO.

5 . The display device of claim 1 , wherein

the first sub-pixel includes a first cap layer covering the second layer of the first upper electrode, and

a refractive index of the first cap layer is smaller than a refractive index of the second layer of the first upper electrode.

6 . The display device of claim 1 , wherein

parts of the first organic layer, the first layer of the first upper electrode, and the second layer of the first upper electrode are located on the upper portion.

7 . The display device of claim 1 , wherein

the rib is formed of an inorganic material.

8 . The display device of claim 1 ,

wherein

the second layer of the first upper electrode and the second layer of the second upper electrode are formed of different materials.

9 . The display device of claim 8 , wherein

the second layer of the first upper electrode is formed of IZO, and

the second layer of the second upper electrode is formed of ITO.

10 . The display device of claim 8 , wherein

the second layer of the first upper electrode is formed of ITO, and

the second layer of the second upper electrode is formed of ITO having higher crystallinity than the second layer of the first upper electrode.

11 . The display device of claim 1 , wherein

the first organic layer of the first sub-pixel is thicker than the second organic layer of the second sub-pixel.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (19)