Display Device

Patent metadata

Field	Value
Publication number	US-2023060279-A1
Application number	US-202017793775-A
Country	US
Kind code	A1
Filing date	Feb 14, 2020
Priority date	Feb 14, 2020
Publication date	Mar 2, 2023
Grant date	—

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 kb 1 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-Sg.

First claim

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

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

3 . The display device according to claim 1 ,
wherein the second light-emitting layer in plan view has an opening inside the peripheral end portion of each of the plurality of pixel electrodes included in the plurality of first sub-pixels, and coincides with the whole circumference of the peripheral end portion.

4 . The display device according to claim 2 ,
wherein each of the third sub-pixels has a light-emitting region that coincides in plan view with the first 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.

5 . The display device according to claim 3 ,
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 claims 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 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 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 7 , 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 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 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 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 each of the pixel electrodes is shaped into an island, and has a peripheral end portion covered with an edge cover film and has a non-peripheral-end portion not covered with the edge cover film.

Assignees

• Sharp Kk

Inventors

• Asaoka Yasushi
• Kamada Tsuyoshi
• Aomori Shigeru

Classifications

• H10K59/353

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

• H10K50/13 Primary

  comprising stacked EL layers within one EL unit · CPC title

• H10K59/352

  the areas of the RGB subpixels being different · CPC title

• H10K50/115

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

• H05B33/22

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