IP Library › Granted Patent US 12,484,386
Granted Patent B2
US 12,484,386 · App. 18/632,335 · Granted Nov 25, 2025

Display device

Inventor: Hiroshi Tabatake (Tokyo, JP)
Assignee: MAGNOLIA WHITE CORPORATION
H10K59/122H10K50/813
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Quick Facts
Patent No.
US 12,484,386
App. No.
18/632,335
Granted
Nov 25, 2025
Kind
B2
Abstract

According to one embodiment, a display device includes a substrate, an insulating layer, a lower electrode, a rib including an aperture and covering a periphery of the lower electrode, a partition above the rib, an upper electrode being in contact with the partition, and an organic layer between the electrodes. The organic layer includes a first organic layer that is in contact with the lower electrode through the aperture, and a second organic layer on the partition. At least a part of the periphery of the lower electrode is located between the insulating layer and the partition in a thickness direction of the insulating layer.

Claims (180)

1 . A display device comprising:

a substrate;

a pixel circuit overlapping the substrate;

an insulating layer on the pixel circuit and including a contact hole;

a first lower electrode and a second lower electrode on the insulating layer and arranged in a second direction crossing at a right angle to a third direction normal to an upper surface of the substrate, the first lower electrode being connected to the pixel circuit at the contact hole;

a first upper electrode opposing the first lower electrode in the third direction;

a second upper electrode opposing the second lower electrode in the third direction;

a first organic layer located between the first lower electrode and the first upper electrode and including a first light-emitting layer;

a second organic layer located between the second lower electrode and the second upper electrode and including a second light-emitting layer;

a rib formed of a first inorganic material on the first lower electrode and the second lower electrode and including:

a lower surface in direct contact with the first lower electrode, the second lower electrode, and the insulating layer,

an upper surface opposing the lower surface of the rib and being farther from the substrate compared to the lower surface of the rib,

a first pixel aperture overlapping the first lower electrode in a plan view, and

a second pixel aperture overlapping the second lower electrode in the plan view; and

a partition located between the first pixel aperture and the second pixel aperture in the plan view, the partition including:

a lower portion on the rib, in direct contact with the upper surface of the rib, and including:

a lower surface in direct contact with the upper surface of the rib, and

an upper surface opposing the lower surface of the lower portion of the partition and being farther from the substrate compared to the lower surface of the lower portion of the partition,

a side surface connecting the lower surface of the lower portion of the partition to the upper surface of the lower portion of the partition, and

an upper portion on the lower portion, in direct contact with the upper surface of the lower portion of the partition, extending beyond the side surface of the lower portion of the partition in the second direction, and including:

a lower surface in direct contact with the upper surface of the lower portion of the partition, and

an upper surface opposing the lower surface of the upper portion of the partition and being farther from the substrate compared to the lower surface of the upper portion of the partition, wherein the first light-emitting layer emits a light of a first color, wherein

the second light-emitting layer emits a light of a second color different from the first color,

the lower portion of the partition includes a first side surface and a second side surface, the first side surface being closer to the first pixel aperture compared to the second side surface in the second direction,

the first side surface of the lower portion of the partition extends from the upper surface of the rib to the lower surface of the upper portion of the partition, the second side surface of the lower portion of the partition extends from the upper surface of the rib to the lower surface of the upper portion of the partition, the upper portion of the partition includes a first end surface and a second end surface, the first end surface being closer to the first pixel aperture compared to the second end surface in the second direction,

the first end surface of the upper portion of the partition connects the lower surface of the upper portion of the partition to the upper surface of the upper portion of the partition,

the second end surface of the upper portion of the partition connects the lower surface of the upper portion of the partition to the upper surface of the upper portion of the partition,

a first width, which is a greatest width between the first end surface of the upper portion of the partition and the second end surface of the upper portion of the partition in the second direction, is greater than a second width, which is a greatest width between the first side surface of the lower portion of the partition and the second side surface of the lower portion of the partition in the second direction,

the rib includes a first step and a second step located between the first lower electrode and the second lower electrode in the second direction,

the first step of the rib is closer to the first lower electrode compared to the second step of the rib in the second direction,

the first step and the second step are located between the first side surface of the lower portion of the partition and the second side surface of the lower portion of the partition in the second direction,

the first upper electrode is in direct contact with the first side surface of the lower portion of the partition,

the second upper electrode is in direct contact with the second side surface of the lower portion of the partition, and

in a cross-sectional view,

the first side surface of the lower portion of the partition is located between the first end surface of the upper portion of the partition and the first step of the rib in the second direction, and

the second side surface of the lower portion of the partition is located between the second end surface of the upper portion of the partition and the second step of the rib in the second direction.

2 . The display device according to claim 1 , wherein

in the cross-sectional view, the lower portion of the partition overlaps the first step of the rib and the second step of the rib.

3 . The display device according to claim 1 , further comprising:

in the cross-sectional view,

a first sealing layer formed of a second inorganic material and covering the first upper electrode, the first side surface of the lower portion of the partition and a part of the upper portion of the partition, and

a second sealing layer formed of a third inorganic material and covering the second upper electrode, the second side surface of the lower portion of the partition and another part of the upper portion of the partition, wherein

in the cross-sectional view,

the first sealing layer includes a third edge above the upper portion of the partition,

the second sealing layer includes a fourth edge above the upper portion of the partition, and

the third edge of the first sealing layer and the fourth edge of the second sealing layer are spaced apart from each other in the second direction.

4 . The display device according to claim 3 , wherein

in the cross-sectional view and in the second direction,

the third edge of the first sealing layer is located between the first side surface of the lower portion of the partition and the second side surface of the lower portion of the partition, and

the fourth edge of the second sealing layer is located between the first side surface of the lower portion of the partition and the second side surface of the lower portion of the partition.

5 . The display device according to claim 3 , wherein

in the cross-sectional view and in the second direction, the third edge of the first sealing layer is opposite the fourth edge of the second sealing layer.

6 . The display device according to claim 3 , wherein

in the cross-sectional view,

the contact hole includes a contact area where the first lower electrode is electrically in contact with the pixel circuit, and

the contact area of the contact hole is located between the third edge of the first sealing layer and the fourth edge of the second sealing layer in the second direction.

7 . The display device according to claim 3 , wherein

in the cross-sectional view,

the contact hole includes a contact area where the first lower electrode is electrically in contact with the pixel circuit, and

the first step of the rib is located between the third edge of the first sealing layer and the fourth edge of the second sealing layer in the second direction.

8 . The display device according to claim 3 , wherein

in the cross-sectional view,

the contact hole includes a contact area where the first lower electrode is electrically in contact with the pixel circuit, and

the first step of the rib is located between the contact area of the contact hole and the fourth edge of the second sealing layer in the second direction.

9 . The display device according to claim 1 , wherein

a thickness of the rib is less than a thickness of the partition.

10 . The display device according to claim 1 , wherein

the first upper electrode does not directly contact the upper portion of the partition, and

the second upper electrode does not directly contact the upper portion of the partition.

11 . A display device comprising:

a substrate;

a pixel circuit overlapping the substrate;

an insulating layer on the pixel circuit and including a contact hole;

a first lower electrode and a second lower electrode on the insulating layer and arranged in a second direction crossing at a right angle to a third direction normal to an upper surface of the substrate, the first lower electrode being connected to the pixel circuit at the contact hole;

a first upper electrode opposing the first lower electrode in the third direction;

a second upper electrode opposing the second lower electrode in the third direction;

a first organic layer located between the first lower electrode and the first upper electrode and including a first light-emitting layer;

a second organic layer located between the second lower electrode and the second upper electrode and including a second light-emitting layer;

a rib formed of a first inorganic material on the first lower electrode and the second lower electrode and including:

a lower surface in direct contact with the first lower electrode, the second lower electrode, and the insulating layer,

an upper surface opposing the lower surface of the rib and being farther from the substrate compared to the lower surface of the rib,

a first pixel aperture overlapping the first lower electrode in a plan view, and

a second pixel aperture overlapping the second lower electrode in the plan view; and

a partition located between the first pixel aperture and the second pixel aperture in the plan view, the partition including:

a lower portion on the rib, in direct contact with the upper surface of the rib, and including:

a lower surface in direct contact with the upper surface of the rib, and

an upper surface opposing the lower surface of the lower portion of the partition and being farther from the substrate compared to the lower surface of the lower portion of the partition,

a side surface connecting the lower surface of the lower portion of the partition to the upper surface of the lower portion of the partition, and

an upper portion on the lower portion, in direct contact with the upper surface of the lower portion of the partition, extending beyond the side surface of the lower portion of the partition in the second direction, and including:

a lower surface in direct contact with the upper surface of the lower portion of the partition, and

an upper surface opposing the lower surface of the upper portion of the partition and being farther from the substrate compared to the lower surface of the upper portion of the partition, wherein the first light-emitting layer emits a light of a first color, wherein

the second light-emitting layer emits a light of a second color different from the first color,

the lower portion of the partition includes a first side surface and a second side surface, the first side surface being closer to the first pixel aperture compared to the second side surface in the second direction,

the first side surface of the lower portion of the partition extends from the upper surface of the rib to the lower surface of the upper portion of the partition, the second side surface of the lower portion of the partition extends from the upper surface of the rib to the lower surface of the upper portion of the partition, the upper portion of the partition includes a first end surface and a second end surface, the first end surface being closer to the first pixel aperture compared to the second end surface in the second direction,

the first end surface of the upper portion of the partition connects the lower surface of the upper portion of the partition to the upper surface of the upper portion of the partition,

the second end surface of the upper portion of the partition connects the lower surface of the upper portion of the partition to the upper surface of the upper portion of the partition,

a first width, which is a greatest width between the first end surface of the upper portion of the partition and the second end surface of the upper portion of the partition in the second direction, is greater than a second width, which is a greatest width between the first side surface of the lower portion of the partition and the second side surface of the lower portion of the partition in the second direction,

the rib includes a first step and a second step located between the first lower electrode and the second lower electrode in the second direction,

the first step of the rib is closer to the first lower electrode compared to the second step of the rib in the second direction,

the first step and the second step are located between the first side surface of the lower portion of the partition and the second side surface of the lower portion of the partition in the second direction,

the first upper electrode is in direct contact with the first side surface of the lower portion of the partition,

the second upper electrode is in direct contact with the second side surface of the lower portion of the partition, and

in a cross-sectional view,

the contact hole includes a contact area where the first lower electrode is electrically in contact with the pixel circuit,

the first step of the rib is located between the contact area of the contact hole and the second side surface of the lower portion of the partition in the second direction,

the first step of the rib is located between the contact area of the contact hole and the second end surface of the upper portion of the partition in the second direction,

the first step of the rib does not overlap the contact area of the contact hole in the third direction,

the second step of the rib is located between the contact area of the contact hole and the second side surface of the lower portion of the partition in the second direction,

the second step of the rib is located between the contact area of the contact hole and the second end surface of the upper portion of the partition in the second direction, and

the second step of the rib does not overlap the contact area of the contact hole in the third direction.

12 . The display device according to claim 11 , wherein

in the cross-sectional view, the lower portion of the partition overlaps the first step of the rib and the second step of the rib.

13 . The display device according to claim 11 , further comprising:

in the cross-sectional view,

a first sealing layer formed of a second inorganic material and covering the first upper electrode, the first side surface of the lower portion of the partition and a part of the upper portion of the partition, and

a second sealing layer formed of a third inorganic material and covering the second upper electrode, the second side surface of the lower portion of the partition and another part of the upper portion of the partition, wherein

in the cross-sectional view,

the first sealing layer includes a third edge above the upper portion of the partition,

the second sealing layer includes a fourth edge above the upper portion of the partition, and

the third edge of the first sealing layer and the fourth edge of the second sealing layer are spaced apart from each other in the second direction.

14 . The display device according to claim 13 , wherein

in the cross-sectional view and in the second direction,

the third edge of the first sealing layer is located between the first side surface of the lower portion of the partition and the second side surface of the lower portion of the partition, and

the fourth edge of the second sealing layer is located between the first side surface of the lower portion of the partition and the second side surface of the lower portion of the partition.

15 . The display device according to claim 13 , wherein

in the cross-sectional view and in the second direction, the third edge of the first sealing layer is opposite the fourth edge of the second sealing layer.

16 . The display device according to claim 13 , wherein

in the cross-sectional view,

the contact hole includes the contact area where the first lower electrode is electrically in contact with the pixel circuit, and

the contact area of the contact hole is located between the third edge of the first sealing layer and the fourth edge of the second sealing layer in the second direction.

17 . The display device according to claim 13 , wherein

in the cross-sectional view,

the contact hole includes the contact area where the first lower electrode is electrically in contact with the pixel circuit, and

the first step of the rib is located between the third edge of the first sealing layer and the fourth edge of the second sealing layer in the second direction.

18 . The display device according to claim 13 , wherein

in the cross-sectional view,

the contact hole includes the contact area where the first lower electrode is electrically in contact with the pixel circuit, and

the first step of the rib is located between the contact area of the contact hole and the fourth edge of the second sealing layer in the second direction.

19 . The display device according to claim 11 , wherein

a thickness of the rib is less than a thickness of the partition.

20 . A display device comprising:

a substrate;

a pixel circuit overlapping the substrate;

an insulating layer on the pixel circuit and including a contact hole;

a first lower electrode and a second lower electrode on the insulating layer and arranged in a second direction crossing at a right angle to a third direction normal to an upper surface of the substrate, the first lower electrode being connected to the pixel circuit at the contact hole;

a first upper electrode opposing the first lower electrode in the third direction;

a second upper electrode opposing the second lower electrode in the third direction;

a first organic layer located between the first lower electrode and the first upper electrode and including a first light-emitting layer;

a second organic layer located between the second lower electrode and the second upper electrode and including a second light-emitting layer;

a rib formed of a first inorganic material on the first lower electrode and the second lower electrode and including:

a lower surface in direct contact with the first lower electrode, the second lower electrode, and the insulating layer,

an upper surface opposing the lower surface of the rib and being farther from the substrate compared to the lower surface of the rib,

a first pixel aperture overlapping the first lower electrode in a plan view, and

a second pixel aperture overlapping the second lower electrode in the plan view;

a partition located between the first pixel aperture and the second pixel aperture in the plan view, the partition including:

a lower portion on the rib, in direct contact with the upper surface of the rib, and including:

a lower surface in direct contact with the upper surface of the rib and

an upper surface opposing the lower surface of the lower portion of the partition and being farther from the substrate compared to the lower surface of the lower portion of the partition,

a side surface connecting the lower surface of the lower portion of the partition to the upper surface of the lower portion of the partition, and

an upper portion on the lower portion, in direct contact with the upper surface of the lower portion of the partition, extending beyond the side surface of the lower portion of the partition in the second direction, and including:

a lower surface in direct contact with the upper surface of the lower portion of the partition, and

an upper surface opposing the lower surface of the upper portion of the partition and being farther from the substrate compared to the lower surface of the upper portion of the partition;

a first sealing layer formed of a second inorganic material and covering the first upper electrode, the first side surface of the lower portion of the partition and a part of the upper portion of the partition; and

a second sealing layer formed of a third inorganic material and covering the second upper electrode, the second side surface of the lower portion of the partition and another part of the upper portion of the partition, wherein

the first light-emitting layer emits a light of a first color,

the second light-emitting layer emits a light of a second color different from the first color,

the lower portion of the partition includes a first side surface and a second side surface, the first side surface being closer to the first pixel aperture compared to the second side surface in the second direction,

the first side surface of the lower portion of the partition extends from the upper surface of the rib to the lower surface of the upper portion of the partition, the second side surface of the lower portion of the partition extends from the upper surface of the rib to the lower surface of the upper portion of the partition, the upper portion of the partition includes a first end surface and a second end surface, the first end surface being closer to the first pixel aperture compared to the second end surface in the second direction,

the first end surface of the upper portion of the partition connects the lower surface of the upper portion of the partition to the upper surface of the upper portion of the partition,

the second end surface of the upper portion of the partition connects the lower surface of the upper portion of the partition to the upper surface of the upper portion of the partition,

a first width, which is a greatest width between the first end surface of the upper portion of the partition and the second end surface of the upper portion of the partition in the second direction, is greater than a second width, which is a greatest width between the first side surface of the lower portion of the partition and the second side surface of the lower portion of the partition in the second direction,

the rib includes a first step and a second step located between the first lower electrode and the second lower electrode in the second direction,

the first step of the rib is closer to the first lower electrode compared to the second step of the rib in the second direction,

the first step and the second step are located between the first side surface of the lower portion of the partition and the second side surface of the lower portion of the partition in the second direction,

the first upper electrode is in direct contact with the first side surface of the lower portion of the partition,

the second upper electrode is in direct contact with the second side surface of the lower portion of the partition, and

in a cross-sectional view,

the contact hole includes a contact area where the first lower electrode is electrically in contact with the pixel circuit,

the upper portion of the partition overlaps an entirety of the contact area of the contact hole, and

the first lower electrode is in direct contact with the first organic layer.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 27, 2025
From: JAPAN DISPLAY INC.
To: MAGNOLIA WHITE CORPORATION
Reel/Frame 071741/0492 →
Priority Claims (1)
JP 2022-001086 · Jan 6, 2022 · national
Continuity (3)
Continuation 18455632 · Aug 25, 2023
Continuation 18090530 · Dec 29, 2022
Related Publication 20240260331A1 · Aug 1, 2024
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