Light-emitting device and method of manufacturing light-emitting device

Patent metadata

Field	Value
Publication number	US-2022344412-A1
Application number	US-201917763910-A
Country	US
Kind code	A1
Filing date	Oct 21, 2019
Priority date	Oct 21, 2019
Publication date	Oct 27, 2022
Grant date	—

Abstract

A light-emitting device includes a light-emitting layer that includes, in each of a plurality of pixels: a light-emitting region in which a drive current flows between a first electrode and a second electrode; and a non-light-emitting region in which no drive current flows between the first electrode and the second electrode. The light-emitting region is divided into a plurality of subregions by a non-light-emitting region in a plan view.

First claim

1 . A light-emitting device comprising:
a first electrode for each of a plurality of pixels; a second electrode common to the plurality of pixels; and a light-emitting layer between the first electrode and the second electrode, wherein the light-emitting layer includes, in each of the plurality of pixels:
a light-emitting region in which a drive current flows between the first electrode and the second electrode; and
a non-light-emitting region in which no drive current flows between the first electrode and the second electrode, and
the light-emitting region is divided into a plurality of subregions by the non-light-emitting region in a plan view, the light-emitting device further comprising an insulation layer in the non-light-emitting region of the light-emitting layer to insulate the first electrode from the second electrode, wherein the insulation layer has an opening in the light-emitting region of the light-emitting layer, and the insulation layer contains light-scattering particles that scatter light coming from the light-emitting region of the light-emitting layer.

2 . (canceled)

3 . The light-emitting device according to claim 1 , further comprising:
a first charge transport layer between the light-emitting layer and the first electrode; and a second charge transport layer between the light-emitting layer and the second electrode, wherein the insulation layer resides either between the light-emitting layer and the first charge transport layer or between the light-emitting layer and the second charge transport layer.

4 . The light-emitting device according to claim 1 , further comprising:
a first charge transport layer between the light-emitting layer and the first electrode; and a second charge transport layer between the light-emitting layer and the second electrode, wherein the insulation layer resides between the first electrode and the first charge transport layer.

5 . (canceled)

6 . The light-emitting device according to claim 1 , wherein the light-emitting region has any one of a stripe-like shape, a lattice-like shape, an elliptical shape, and a comb-like shape in a plan view.

7 . The light-emitting device according to claim 1 , wherein the opening has any one of a stripe-like shape, a lattice-like shape, an elliptical shape, and a comb-like shape in a plan view.

8 . The light-emitting device according to claim 7 , wherein the opening is provided avoiding an edge of the first electrode.

9 . The light-emitting device according to claim 1 , wherein
the non-light-emitting region has a stripe-like shape in a plan view, and the light-emitting region has a comb-like shape that matches the stripe-like shape of the non-light-emitting region.

10 . The light-emitting device according to claim 1 , wherein
either one or both of the first electrode and the second electrode is/are divided into a plurality of segments by a notch, and the non-light-emitting region overlaps the notch in a plan view.

11 . The light-emitting device according to claim 10 , wherein the plurality of segments into which either one or both of the first electrode and the second electrode that is/are divided by the notch are electrically connected to each other.

12 . The light-emitting device according to claim 10 , wherein
the notch in the first electrode has a lattice-like shape in a plan view, and the notch has an intersection with a round corner to prevent concentration of electric field.

13 . A method of manufacturing a light-emitting device, the method comprising:
a first electrode forming step of forming a first electrode for each of a plurality of pixels; a second electrode forming step of forming a second electrode common to the plurality of pixels; and a light-emitting layer forming step of forming a light-emitting layer between the first electrode and the second electrode, the first electrode forming step, the light-emitting layer forming step, and the second electrode forming step being implemented in a stated order, wherein the light-emitting layer includes, in each of the plurality of pixels:
a light-emitting region in which a drive current flows between the first electrode and the second electrode; and
a non-light-emitting region in which no drive current flows between the first electrode and the second electrode, and
the light-emitting region is divided into a plurality of subregions by the non-light-emitting region in a plan view, the method further comprising an insulation layer forming step of forming an insulation layer in the non-light-emitting region of the light-emitting layer to insulate the first electrode from the second electrode, wherein the insulation layer forming step is implemented after the light-emitting layer forming step, but before the first electrode forming step.

14 . (canceled)

15 . (canceled)

16 . The method according to claim 13 , wherein either one or both of the first electrode forming step and the second electrode forming step form(s) a groove in either one or both of the first electrode and the second electrode by etching.

Assignees

• Sharp Kk

Inventors

• Aomori Shigeru
• Kamada Tsuyoshi
• Asaoka Yasushi

Classifications

• H05B33/22

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

• H05B33/10

  Apparatus or processes specially adapted to the manufacture of electroluminescent light sources · CPC title

• H05B33/12

  Light sources with substantially two-dimensional [2D] radiating surfaces · CPC title

• H01L27/3218 Primary

  Electricity · mapped topic

• H01L51/56

  Electricity · mapped topic