Method of manufacturing display device and display device

Patent metadata

Field	Value
Publication number	US-12501764-B2
Application number	US-202018265978-A
Country	US
Kind code	B2
Filing date	Dec 22, 2020
Priority date	Dec 22, 2020
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

A method of manufacturing a display device includes: a) forming a first pixel electrode and a second pixel electrode; b) forming a first light-emitting layer on the first pixel electrode; c) forming a photosensitive resin layer on the second pixel electrode and on the first light-emitting layer; d) forming a photosensitive resin pattern having an opening on the second pixel electrode and including a structural member e) forming a light-emitting material layer on the photosensitive resin pattern and on an opening bottom portion that is at least a part of the second pixel electrode and that is provided below the opening; and f) forming a second light-emitting layer on the second pixel electrode by lifting off a first lift-off portion that is a part of the photosensitive resin pattern and a second lift-off portion that is a part of the light-emitting material layer, with the structural member being left intact.

First claim

The invention claimed is:

1 . A method of manufacturing a display device, the method comprising:
a) a step of forming a first pixel electrode and a second pixel electrode; b) a step of forming a first light-emitting layer on the first pixel electrode; c) a step of forming a photosensitive resin layer on the second pixel electrode and on the first light-emitting layer; d) a step of forming a photosensitive resin pattern by patterning the photosensitive resin layer, the photosensitive resin pattern having an opening on the second pixel electrode and including a structural member portion that is to be a structural member including either one or both of an edge cover segment on a perimeter of the first light-emitting layer and a pixel boundary segment between the first pixel electrode and the second pixel electrode; e) a step of forming a light-emitting material layer on the photosensitive resin pattern and on an opening bottom portion that is at least a part of the second pixel electrode and that is provided below the opening; and f) a step of forming a second light-emitting layer on the second pixel electrode from the light-emitting material layer by dissolving, in a development solution, a first lift-off portion that is a part of the photosensitive resin pattern and that is provided on the first light-emitting layer, and lifting off a second lift-off portion that is a part of the light-emitting material layer and that is provided on the first lift-off portion, with the structural member being left intact.

2 . The method according to claim 1 , wherein step e) forms the light-emitting material layer in such a manner that the light-emitting material layer covers the entire opening bottom portion and the entire photosensitive resin pattern.

3 . The method according to claim 1 , wherein the structural member includes the edge cover segment.

4 . The method according to claim 1 , wherein step f) lifts off the first lift-off portion and the second lift-off portion in such a manner that the structural member remains as an edge cover on a perimeter of the second pixel electrode.

5 . The method according to claim 1 further comprising g) a step of forming a charge transport layer on the second pixel electrode, wherein step f) lifts off the first lift-off portion and the second lift-off portion in such a manner that the structural member remains as an edge cover on a perimeter of the charge transport layer.

6 . The method according to claim 1 , wherein step b) forms the first light-emitting layer in such a manner that the first light-emitting layer covers the entire first pixel electrode.

7 . The method according to claim 1 , wherein the photosensitive resin layer contains a positive photosensitive resin.

8 . The method according to claim 1 , wherein the first light-emitting layer contains first quantum dots, and the second light-emitting layer contains second quantum dots.

9 . The method according to claim 8 , wherein the first quantum dots have a larger particle diameter than do the second quantum dots.

10 . The method according to claim 1 , further comprising h) a step of forming an opposite electrode opposite the first pixel electrode across the first light-emitting layer and opposite the second pixel electrode across the second light-emitting layer.

11 . A display device comprising:
a substrate having a main face; a first pixel electrode on the main face; a second pixel electrode adjacent to the first pixel electrode on the main face; a first light-emitting layer on an opposite side of the first pixel electrode from a side on which the main face is disposed; a second light-emitting layer on an opposite side of the second pixel electrode from a side on which the main face is disposed; and a structural member provided across on a perimeter of the first light-emitting layer and outside the perimeter of the first light-emitting layer, the structural member including a first edge cover segment on a side of a perimeter of the second light-emitting layer on which the main face is disposed.

12 . The display device according to claim 11 , wherein the structural member includes a second edge cover segment on a perimeter of the second pixel electrode.

13 . The display device according to claim 11 , further comprising a charge transport layer on the second pixel electrode, wherein the structural member further includes a third edge cover segment on a perimeter of the charge transport layer.

14 . The display device according claim 11 , wherein the structural member is made of a cured positive photosensitive resin.

15 . The display device according to claim 11 , further comprising another structural member on a side of the structural member on which the main face is disposed, the other structural member being provided across on a perimeter of the first pixel electrode, between the first pixel electrode and the second pixel electrode, and on a perimeter of the second pixel electrode.

16 . The display device according to claim 11 , wherein the first light-emitting layer contains first quantum dots, and the second light-emitting layer contains second quantum dots.

17 . The display device according to claim 16 , wherein the first quantum dots have a larger particle diameter than do the second quantum dots.

18 . The display device according to claim 16 , wherein the first quantum dots have a shorter fluorescence life than do the second quantum dots.

19 . The display device according to claim 16 , wherein the first quantum dots have a green emission wavelength.

20 . The display device according to claim 16 , wherein the first quantum dots have a green emission wavelength, and the second quantum dots have a red or blue emission wavelength.

Assignees

• Sharp Kk

Inventors

• Asaoka Yasushi
• Sakuma Jun
• Adachi Takahiro

Classifications

• H10K71/221

  by lift-off techniques · CPC title

• H10K71/60

  Forming conductive regions or layers, e.g. electrodes · CPC title

• H10K50/115 Primary

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

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/1201 Primary

  Manufacture or treatment · CPC title