Display device

Patent metadata

Field	Value
Publication number	US-12426437-B2
Application number	US-202017793775-A
Country	US
Kind code	B2
Filing date	Feb 14, 2020
Priority date	Feb 14, 2020
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

According to an aspect of the disclosure, a first light-emitting layer coincides in plan view with each whole of a plurality of pixel electrodes included in a plurality of second sub-pixels, and with each whole of a plurality of pixel electrodes included in a plurality of third sub-pixels. The first light-emitting layer is shaped into a continuous form. A third light-emitting layer in plan view: has an opening kb1 inside a peripheral end portion of each of a plurality of pixel electrodes included in a plurality of first sub-pixels, and coincides with a whole circumference of the peripheral end portion; and has an opening inside a peripheral end portion of each of a plurality of pixel electrodes included in the plurality of second sub-pixels, and coincides with a whole circumference of the peripheral end portion.

First claim

The invention claimed is:

1. A display device comprising a plurality of first sub-pixels, each including a pixel electrode; a plurality of second sub-pixels, each including a pixel electrode; and a plurality of third sub-pixels, each including a pixel electrode, the display device comprising:
a first light-emitting layer that overlaps, in a plan view, with the pixel electrode included in each of the plurality of first sub-pixels;
a second light-emitting layer that overlaps, in the plan view, with the pixel electrode included in each of the plurality of second sub-pixels; and
a third light-emitting layer that overlaps, in the plan view, with the pixel electrode included in each of the plurality of third sub-pixels,
wherein the first light-emitting layer overlaps, in the plan view, with an entirety of the pixel electrode included in each of the plurality of second sub-pixels, and with an entirety of the pixel electrode included in each of the plurality of third sub-pixels, the first light-emitting layer being shaped into a continuous form,
the third light-emitting layer, in the plan view, has a first opening inside a first peripheral end portion of the pixel electrode included in each of the plurality of first sub-pixels, and overlaps with an entire circumference of the first peripheral end portion, and
the third light-emitting layer, in the plan view, has a second opening inside a second peripheral end portion of the pixel electrode included in each of the plurality of second sub-pixels, and overlaps with an entire circumference of the second peripheral end portion.

2. The display device according to claim 1 ,
wherein the second light-emitting layer in the plan view, has a third opening inside the first peripheral end portion of the pixel electrode included in each of the plurality of first sub-pixels, and overlaps with the entire circumference of the first peripheral end portion, and
the second light-emitting layer, in the plan view, has a fourth opening inside a third peripheral end portion of the pixel electrode included in each of the plurality of third sub-pixels, and overlaps with an entire circumference of the third peripheral end portion.

3. The display device according to claim 2 ,
wherein each of the plurality of third sub-pixels has a light-emitting region that overlaps, in the plan view, with the first light-emitting layer and the third light-emitting layer, and
each of the plurality of second sub-pixels has a light-emitting region that overlaps, in the plan view, with the first light-emitting layer and the second light-emitting layer.

4. The display device according to claim 1 ,
wherein the second light-emitting layer, in the plan view, has a third opening inside the first peripheral end portion of the pixel electrode included in each of the plurality of first sub-pixels, and overlaps with the entire circumference of the first peripheral end portion.

5. The display device according to claim 4 ,
wherein each of the third sub-pixels has a light-emitting region that coincides in plan view with the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer, and
each of the second sub-pixels has a light-emitting region that coincides in plan view with the first light-emitting layer and the second light-emitting layer.

6. The display device according to claim 1 ,
wherein an electron affinity of the first light-emitting layer is larger than an electron affinity of the second light-emitting layer, and
the electron affinity of the second light-emitting layer is larger than an electron affinity of the third light-emitting layer.

7. The display device according to claim 1 ,
wherein each of the plurality of first sub-pixels, the plurality of second sub-pixels, and the plurality of third sub-pixels includes a hole-transport layer,
in each of the plurality of second sub-pixels, the second light-emitting layer is disposed between the first light-emitting layer and the hole-transport layer, and
in each of the plurality of third sub-pixels, the third light-emitting layer is disposed between the first light-emitting layer and the hole-transport layer.

8. The display device according to claim 1 , further comprising:
a common electrode provided in common among the plurality of first sub-pixels, the plurality of second sub-pixels, and the plurality of third sub-pixels,
wherein in each of the plurality of second sub-pixels, the first light-emitting layer is disposed between the second light-emitting layer and the common electrode, and
in each of the plurality of third sub-pixels, the first light-emitting layer is disposed between the third light-emitting layer and the common electrode.

9. The display device according to claim 8 ,
wherein each of the plurality of first sub-pixels, the plurality of second sub-pixels, and the plurality of third sub-pixels further includes an electron-transport layer, and
in each of the plurality of first sub-pixels, the plurality of second sub-pixels, and the plurality of third sub-pixels, the electron-transport layer is disposed between the common electrode and the first light-emitting layer.

10. The display device according to claim 1 ,
wherein the first light-emitting layer includes quantum dots that emit a red light, the second light-emitting layer includes quantum dots that emit a green light, and the third light-emitting layer includes quantum dots that emit a blue light.

11. The display device according to claim 1 ,
wherein each of the second light-emitting layer and the third light-emitting layer is shaped into a continuous form.

12. The display device according to claim 1 ,
wherein the pixel electrode in each of the plurality of first sub-pixels, the pixel electrode in each of the plurality of second sub-pixels, and the pixel electrode in each of the plurality of third sub-pixels are each shaped into an island, have a peripheral end portion covered with an edge cover film, and have a non-peripheral-end portion not covered with the edge cover film.

Assignees

• Sharp Kk

Inventors

• Asaoka Yasushi
• Kamada Tsuyoshi
• Aomori Shigeru

Classifications

• H10K50/15

  Hole transporting layers · CPC title

• H10K50/115

  comprising active inorganic nanostructures, e.g. luminescent quantum dots · CPC title

• H10K59/353

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

• H10K59/352

  the areas of the RGB subpixels being different · CPC title

• H05B33/22

  characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers · CPC title