Disclosure is related to a display device

Patent metadata

Field	Value
Publication number	US-12268072-B2
Application number	US-201817272574-A
Country	US
Kind code	B2
Filing date	Sep 7, 2018
Priority date	Sep 7, 2018
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

A display device according to an aspect of the disclosure includes: a first subpixel including a first pixel electrode, a second subpixel adjacent to the first subpixel and including a second pixel electrode, and a third subpixel adjacent to the first subpixel and including a third pixel electrode, a first light-emitting layer overlapping the entire first pixel electrode, a second light-emitting layer overlapping the entire second pixel electrode, and a third light-emitting layer overlapping the entire third pixel electrode, wherein an entire circumference of a peripheral edge portion of the first pixel electrode overlaps the first light-emitting layer and at least one of the second light-emitting layer and the third light-emitting layer.

First claim

The invention claimed is:

1. A display device comprising:
a first subpixel including a first pixel electrode;
a second subpixel adjacent to the first subpixel and including a second pixel electrode;
a third subpixel adjacent to the first subpixel and including a third pixel electrode;
a first light-emitting layer overlapping an entirety of the first pixel electrode;
a second light-emitting layer overlapping an entirety of the second pixel electrode;
a third light-emitting layer overlapping an entirety of the third pixel electrode; and
a common electrode in a layer above the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer,
wherein a central portion of the first pixel electrode is in direct contact with, the first light-emitting layer, and
wherein an entire circumferential edge of the first pixel electrode overlaps, and is in direct contact with at least one of the second light-emitting layer and the third light-emitting layer.

2. The display device according to claim 1 ,
wherein a valid portion located inside the entire circumferential edge in the first pixel electrode overlaps the first light-emitting layer without overlapping the second light-emitting layer and the third light-emitting layer.

3. The display device according to claim 1 ,
wherein the first subpixel, the second subpixel, and the third subpixel emit light of colors different from each other.

4. The display device according to claim 1 ,
wherein each of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer is a layer common to a plurality of adjacent subpixels of the same color,
the first light-emitting layer overlaps, in common, portions of peripheral edge portions of the plurality of pixel electrodes included in the plurality of subpixels of the same color as the second subpixel, and overlaps, in common, portions of peripheral edge portions of the plurality of pixel electrodes included in the plurality of subpixels of the same color as the third subpixel,
the second light-emitting layer overlaps, in common, portions of peripheral edge portions of the plurality of pixel electrodes included in the plurality of subpixels of the same color as the first subpixel, and overlaps, in common, portions of peripheral edge portions of the plurality of pixel electrodes included in the plurality of subpixels of the same color as the third subpixel, and
the third light-emitting layer overlaps, in common, portions of peripheral edge portions of the plurality of pixel electrodes included in the plurality of subpixels of the same color as the first subpixel, and overlaps, in common, portions of peripheral edge portions of the plurality of pixel electrodes included in the plurality of subpixels of the same color as the second subpixel.

5. The display device according to claim 1 ,
wherein each of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer is a layer common to a plurality of adjacent subpixels of the same color,
the first light-emitting layer includes openings inside peripheral edge portions of the plurality of pixel electrodes included in the subpixels of the same color as the second subpixel and overlaps entire circumferences of the peripheral edge portions, and includes openings inside peripheral edge portions of the plurality of pixel electrodes included in the subpixels of the same color as the third subpixel and overlaps entire circumferences of the peripheral edge portions,
the second light-emitting layer includes openings inside peripheral edge portions of the plurality of pixel electrodes included in the subpixels of the same color as the first subpixel and overlaps entire circumferences of the peripheral edge portions, and includes openings inside peripheral edge portions of the plurality of pixel electrodes included in the subpixels of the same color as the third subpixel and overlaps entire circumferences of the peripheral edge portions, and
the third light-emitting layer includes openings inside peripheral edge portions of the plurality of pixel electrodes included in the subpixels of the same color as the first subpixel and overlaps entire circumferences of the peripheral edge portions, and includes openings inside peripheral edge portions of the plurality of pixel electrodes included in the subpixels of the same color as the second subpixel and overlaps entire circumferences of the peripheral edge portions.

6. The display device according to claim 1 , further comprising:
a fourth subpixel adjacent to the first subpixel and including a fourth pixel electrode; and
a fifth subpixel adjacent to the first subpixel and including a fifth pixel electrode,
wherein an entirety of the fourth pixel electrode and an entirety of the fifth pixel electrode overlap the first light-emitting layer.

7. The display device according to claim 1 ,
wherein the entire circumferential edge of the first pixel electrode includes a portion overlapping the first light-emitting layer and the second light-emitting layer, and another portion overlapping the first light-emitting layer and the third light-emitting layer.

8. The display device according to claim 1 ,
wherein an opening overlapping the first pixel electrode is provided to each of the second light-emitting layer and the third light-emitting layer, and
the entire circumference of the peripheral edge portion of the first pixel electrode overlaps the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer.

9. The display device according to claim 1 ,
wherein in a region where a plurality of light-emitting layers, including the first, second, and third light-emitting layers, overlaps, a light-emitting layer of the plurality of light-emitting layers that has a larger emission wavelength is positioned in a layer above another light-emitting layer of the plurality of light-emitting layers that has a smaller emission wavelength.

10. The display device according to claim 1 ,
wherein each of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer includes quantum dots and a photosensitive resin.

11. The display device according to claim 3 ,
wherein planar shapes of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer are different from each other.

12. The display device according to claim 1 ,
wherein the common electrode has a shape in which a portion overlapping the first pixel electrode protrudes toward the first pixel electrode.

13. The display device according to claim 1 ,
wherein, in a planar view, a distance from an edge of the first pixel electrode to a light-emitting region of the first subpixel is smaller than a width of the light-emitting region of the first subpixel.

14. The display device according to claim 3 ,
wherein a light emission area of the first subpixel, a light emission area of the second subpixel, and a light emission area of the third subpixel are different from each other.

15. The display device according to claim 8 ,
wherein in two light-emitting layers of the first, second and third light emitting layers in contact with each other, an edge of the light-emitting layer in a lower layer is covered with the light-emitting layer in an upper layer.

16. The display device according to claim 8 ,
wherein an entire of the opening of the second light-emitting layer and an entire of the opening of the third light-emitting layer overlap the first light-emitting layer.

Assignees

• Sharp Kk

Inventors

• Asaoka Yasushi
• Aomori Shigeru

Classifications

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/80521

  characterised by their shape · CPC title

• H10K59/80515

  characterised by their shape · CPC title

• H10H29/142

  Two-dimensional arrangements, e.g. asymmetric LED layout · CPC title

• H10K59/353

  characterised by the geometrical arrangement of the RGB subpixels · CPC title