US-20260130062-A1 - DISPLAY DEVICE

US20260130062A1US 20260130062 A1US20260130062 A1US 20260130062A1US-20260130062-A1

Abstract

According to one embodiment, a display device includes a rib including first to third pixel apertures, a partition which includes a lower portion on the rib and an upper portion protruding from a side surface of the lower portion, first to third display elements overlapping the first to third pixel apertures, first to third sealing layers including first to third portions on the upper portion. At least two of a first width of an area in which the first portion overlaps the upper portion, a second width of an area in which the second portion overlaps the upper portion and a third width of an area in which the third portion overlaps the upper portion are different from each other.

Inventors

Yuko Matsumoto
Kimitaka OHATA
Hiraaki KOKAME

Assignees

MAGNOLIA WHITE CORPORATION

Dates

Publication Date: 20260507
Application Date: 20260107
Priority Date: 20220615

Claims (20)

1 . A display device comprising: a rib comprising a first pixel aperture and a second pixel aperture; a partition which includes a lower portion provided on the rib and an upper portion protruding from a side surface of the lower portion, and surrounds the first pixel aperture and the second pixel aperture; a first display element which includes a first lower electrode, a first upper electrode and a first organic layer provided between the first lower electrode and the first upper electrode and including a first light-emitting layer, and overlaps the first pixel aperture; a second display element which includes a second lower electrode, a second upper electrode and a second organic layer provided between the second lower electrode and the second upper electrode and including a second light-emitting layer, and overlaps the second pixel aperture; a first sealing layer which covers the first display element and comprises a first portion located on the upper portion; and a second sealing layer which covers the second display element and comprises a second portion located on the upper portion 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, and a first width of an area in which the first portion of the first sealing layer overlaps the upper portion of the partition is different from a second width of an area in which the second portion of the second sealing layer overlaps the upper portion of the partition.
2 . The display device of claim 1 , wherein an area of the first pixel aperture is greater than an area of the second pixel aperture, and the first width is less than the second width.
3 . The display device of claim 2 , wherein the first color is blue, and the second color is green.
4 . The display device of claim 2 , wherein the first color is blue, and the second color is red.
5 . The display device of claim 2 , wherein the first color is green, and the second color is red.
6 . The display device of claim 1 , further comprising: a third pixel aperture included in the rib; a third display element which includes a third lower electrode, a third upper electrode and a third organic layer provided between the third lower electrode and the third upper electrode, and overlaps the third pixel aperture; and a third sealing layer which covers the third display element and comprises a third portion located on the upper portion, wherein a third width of an area in which the third portion of the third sealing layer overlaps the upper portion of the partition is different from at least one of the first width and the second width.
7 . The display device of claim 6 , wherein the first width, the second width and the third width are different from each other.
8 . The display device of claim 6 , wherein an area of the first pixel aperture is greater than an area of the second pixel aperture, an area of the third pixel aperture is less than the area of the second pixel aperture, the first width is less than the second width, and the third width is greater than the second width.
9 . The display device of claim 8 , wherein the first color is blue, the second color is green, and the third color is red.
10 . The display device of claim 1 , wherein the first lower electrode and the second lower electrode are arranged in a first direction, the rib, the lower portion of the partition, and the upper portion of the partition are stacked in a third direction crossing the first direction, the first portion of the first sealing layer overlaps the upper portion of the partition in the third direction, the first width is a width in the first direction, the second portion of the second sealing layer overlaps the upper portion of the partition in the third direction, and the second width is a width in the first direction.
11 . A display device comprising: a substrate; a first lower electrode and a second lower electrode provided on the substrate and arranged in a first direction in a plan view; a rib provided on the first lower electrode and the second lower electrode, the rib including a first pixel aperture overlapping the first lower electrode and a second pixel aperture overlapping the second lower electrode; a partition surrounding the first lower electrode and the second lower electrode in the plan view, the partition including a lower portion provided on the rib and an upper portion provided on the lower portion and protruding from a side surface of the lower portion; a first organic layer covering the first lower electrode at the first pixel aperture and including a first light-emitting layer; a second organic layer covering the second lower electrode at the second pixel aperture and including a second light-emitting layer; a first upper electrode covering the first organic layer; a second upper electrode covering the second organic layer; a first sealing layer covering the first upper electrode and in direct contact with the lower portion of the partition; and a second sealing layer covering the second upper electrode and in direct contact with the lower 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 first sealing layer includes a first overlapping portion overlapping the upper portion of the partition, the second sealing layer includes a second overlapping portion overlapping the upper portion of the partition, and a first width of the first overlapping portion of the first sealing layer in the first direction is different from a second width of the second overlapping portion of the second sealing layer in the first direction.
12 . The display device of claim 11 , wherein an area of the first pixel aperture is greater than an area of the second pixel aperture, and the first width is less than the second width.
13 . The display device of claim 12 , wherein the first color is blue, and the second color is green.
14 . The display device of claim 12 , wherein the first color is blue, and the second color is red.
15 . The display device of claim 12 , wherein the first color is green, and the second color is red.
16 . The display device of claim 11 , further comprising: a third lower electrode provided on the substrate; a third pixel aperture included in the rib, the rib being provided on the third lower electrode; a third organic layer covering the third lower electrode at the third pixel aperture and including a third light-emitting layer; a third upper electrode covering the third organic layer; and a third sealing layer covering the third upper electrode and in direct contact with the lower portion of the partition, wherein the third light-emitting layer emits a light of a third color, the third color is different from the first color and the second color, the first lower electrode and the third lower electrode are arranged in the first direction in the plan view, the second lower electrode and the third lower electrode are arranged in a second direction crossing the first direction, the third sealing layer includes a third portion overlapping the upper portion of the partition, and a third width of the third portion of the third sealing layer in the first direction is different from at least one of the first width and the second width.
17 . The display device of claim 16 , wherein the first width, the second width and the third width are different from each other.
18 . The display device of claim 16 , wherein an area of the first pixel aperture is greater than an area of the second pixel aperture, an area of the third pixel aperture is less than the area of the second pixel aperture, the first width is less than the second width, and the third width is greater than the second width.
19 . The display device of claim 18 , wherein the first color is blue, the second color is green, and the third color is red.
20 . The display device of claim 11 , wherein the rib, the lower portion of the partition, and the upper portion of the partition are stacked in a third direction crossing the first direction, the first overlapping portion of the first sealing layer overlaps the upper portion of the partition in the third direction, and the second overlapping portion of the second sealing layer overlaps the upper portion of the partition in the third direction.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a Continuation Application of U.S. application Ser. No. 18/334,411, filed on Jun. 14, 2023, which is based upon and claims the benefit of priority from Japanese Patent Application No. 2022-096615, filed Jun. 15, 2022, the entire contents of each are incorporated herein by reference. FIELD Embodiments described herein relate generally to a display device. BACKGROUND Recently, display devices to which an organic light emitting diode (OLED) is applied as a display element have been put into practical use. This display element comprises a lower electrode, an organic layer which covers the lower electrode, and an upper electrode which covers the organic layer. When such a display device is manufactured, a technique which improves the display quality and reliability is required. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration example of a display device according to a first embodiment. FIG. 2 is a diagram showing an example of the layout of subpixels. FIG. 3 is a schematic cross-sectional view of the display device along the III-III line of FIG. 2. FIG. 4 is a schematic cross-sectional view showing the structure of a partition which surrounds a first subpixel and its vicinity. FIG. 5 is a schematic cross-sectional view showing the structure of the partition which surrounds a second subpixel and its vicinity. FIG. 6 is a schematic cross-sectional view showing the structure of the partition which surrounds a third subpixel and its vicinity. FIG. 7 is a flowchart showing an example of the manufacturing method of the display device according to the first embodiment. FIG. 8 is a schematic cross-sectional view showing a process of the manufacturing method of FIG. 7. FIG. 9 is a schematic cross-sectional view showing the process subsequent to FIG. 8. FIG. 10 is a schematic cross-sectional view showing the process subsequent to FIG. 9. FIG. 11 is a schematic cross-sectional view showing the process subsequent to FIG. 10. FIG. 12 is a schematic cross-sectional view showing the process subsequent to FIG. 11. FIG. 13 is a schematic cross-sectional view showing the process subsequent to FIG. 12. FIG. 14 is a schematic cross-sectional view showing the process subsequent to FIG. 13. FIG. 15 is a schematic cross-sectional view showing the process subsequent to FIG. 14. FIG. 16 is a schematic cross-sectional view showing the process subsequent to FIG. 15. FIG. 17 is a schematic cross-sectional view showing the process subsequent to FIG. 16. FIG. 18 is a schematic cross-sectional view showing the process subsequent to FIG. 17. FIG. 19 is a diagram for explaining a manufacturing method according to a comparative example of the first embodiment. FIG. 20 is a schematic cross-sectional view showing the structure of a partition which surrounds a first subpixel and its vicinity according to a second embodiment. FIG. 21 is a flowchart showing an example of the manufacturing method of a display device according to the second embodiment. FIG. 22 is a schematic cross-sectional view showing a process of the manufacturing method of FIG. 21. FIG. 23 is a schematic cross-sectional view showing the process subsequent to FIG. 22. FIG. 24 is a schematic cross-sectional view showing the process subsequent to FIG. 23. FIG. 25 is a schematic cross-sectional view showing the process subsequent to FIG. 24. FIG. 26 is a schematic cross-sectional view showing the process subsequent to FIG. 25. FIG. 27 is a schematic cross-sectional view showing the process subsequent to FIG. 26. FIG. 28 is a schematic cross-sectional view showing the process subsequent to FIG. 27. FIG. 29 is a schematic cross-sectional view showing the process subsequent to FIG. 28. FIG. 30 is a schematic cross-sectional view showing the process subsequent to FIG. 29. DETAILED DESCRIPTION In general, according to one embodiment, a display device comprises a rib, a partition, a first display element, a second display element, a third display element, a first sealing layer, a second sealing layer and a third sealing layer. The rib comprises a first pixel aperture, a second pixel aperture and a third pixel aperture. The partition includes a lower portion provided on the rib and an upper portion protruding from a side surface of the lower portion and surrounds the first pixel aperture, the second pixel aperture and the third pixel aperture. The first display element includes a first lower electrode, a first upper electrode and a first organic layer provided between the first lower electrode and the first upper electrode and overlaps the first pixel aperture. The second display element includes a second lower electrode, a second upper electrode and a second organic layer provided between the second lower electrode and the second upper electrode and overlaps the second pixel aperture. The third display element includes a third lower electrode, a third upper electrode and a third organic layer provided be