Light-emitting diode, display device including the same, and electronic device including the same

Patent metadata

Field	Value
Publication number	US-2025294975-A1
Application number	US-202519030636-A
Country	US
Kind code	A1
Filing date	Jan 17, 2025
Priority date	Mar 14, 2024
Publication date	Sep 18, 2025
Grant date	—

Abstract

A display device includes a pixel circuit layer, a via insulating layer on the pixel circuit layer and including a groove, and a light-emitting diode including a first area overlapping the groove and a second area surrounding the first area in a plan view. The light-emitting diode includes a first electrode including a first portion disposed in the groove in the first area and a second portion extending from the first portion and disposed in the second area, a light scattering layer on the first portion of the first electrode and including a scattering body, a light-transmitting conductive layer on the light scattering layer, an emission layer on the light-transmitting conductive layer, and a second electrode on the emission layer. A distance between a substrate and the first portion of the first electrode is less than a distance between the substrate and the second portion of the first electrode.

First claim

What is claimed is:

1 . A display device comprising:
a pixel circuit layer disposed on a substrate and comprising a thin-film transistor; a via insulating layer disposed on the pixel circuit layer and including a groove; and a light-emitting diode disposed on the via insulating layer and comprising a first area overlapping the groove and a second area surrounding the first area in a plan view, wherein the light-emitting diode comprises:
a first electrode comprising a first portion disposed in the groove in the first area and a second portion extending from the first portion and disposed in the second area;
a light scattering layer disposed on the first portion of the first electrode and comprising a scattering body;
a light-transmitting conductive layer disposed on the light scattering layer;
an emission layer disposed on the light-transmitting conductive layer; and
a second electrode on the emission layer, and
a distance between the substrate and the first portion of the first electrode is less than a distance between the substrate and the second portion of the first electrode.

2 . The display device of claim 1 , wherein
an upper surface of the via insulating layer comprises a first surface, a second surface at a higher level than the first surface, and a third surface connecting the first surface to the second surface, and the first surface of the via insulating layer and the third surface of the via insulating layer define the groove.

3 . The display device of claim 2 , wherein
the first portion of the first electrode is disposed on the first surface of the via insulating layer and the third surface of the via insulating layer, and the second portion of the first electrode is disposed on the second surface of the via insulating layer.

4 . The display device of claim 2 , wherein an angle between the first surface of the via insulating layer and the third surface of the via insulating layer is in a range of about 20° to about 40°.

5 . The display device of claim 1 , wherein the light scattering layer is disposed in the groove of the via insulating layer.

6 . The display device of claim 1 , wherein the light-transmitting conductive layer contacts the light scattering layer in the first area and contacts the first electrode in the second area.

7 . The display device of claim 1 , wherein the light-transmitting conductive layer comprises a first inorganic layer and a second inorganic layer on the first inorganic layer.

8 . The display device of claim 1 , further comprising:
a pixel-defining layer on the light-transmitting conductive layer, the pixel-defining layer including a pixel opening that exposes a part of the light-transmitting conductive layer.

9 . The display device of claim 8 , wherein, in a plan view, an area of the first area is about 20% to about 80% of an area of a light-emitting area of the light-emitting diode defined by the pixel-defining layer.

10 . The display device of claim 9 , wherein, in a plan view, the area of the first area is less than an area of the second area.

11 . The display device of claim 9 , wherein, in a plan view, the area of the first area is greater than an area of the second area.

12 . The display device of claim 8 , further comprising:
an insulating pattern overlapping the pixel-defining layer in a plan view and disposed between the via insulating layer and the first electrode, wherein the first electrode further comprises a third portion extending from the second portion and disposed on a side surface of the insulating pattern.

13 . The display device of claim 1 , wherein a thickness of the light scattering layer is in a range of about 1.5 μm to about 4 μm.

14 . The display device of claim 1 , further comprising:
an encapsulation layer disposed on the light-emitting diode and encapsulating the light-emitting diode; and a color filter layer disposed on the encapsulation layer.

15 . A display device comprising:
a pixel circuit layer disposed on a substrate and comprising a thin-film transistor; a via insulating layer disposed on the pixel circuit layer and including a groove; a first electrode comprising a first portion disposed in the groove of the via insulating layer and a second portion extending from the first portion and disposed outside the groove; a light scattering layer disposed on the first portion of the first electrode and comprising a scattering body; an emission layer disposed on the light scattering layer; a second electrode on the emission layer; and a light-transmitting conductive portion comprising a portion disposed between the light scattering layer and the emission layer and another portion disposed between the second portion of the first electrode and the emission layer.

16 . The display device of claim 15 , wherein
an upper surface of the via insulating layer comprises a first surface, a second surface at a higher level than the first surface, and a third surface connecting the first surface to the second surface, and the first surface of the via insulating layer and the third surface of the via insulating layer define the groove.

17 . The display device of claim 16 , wherein
the first portion of the first electrode is disposed on the first surface of the via insulating layer and the third surface of the via insulating layer, and the second portion of the first electrode is disposed on the second surface of the via insulating layer.

18 . The display device of claim 16 , wherein an angle between the first surface of the via insulating layer and the third surface of the via insulating layer is in a range of about 20° to about 40°.

19 . The display device of claim 15 , further comprising:
a pixel-defining layer disposed on the first electrode and including a pixel opening that exposes a part of the first electrode.

20 . The display device of claim 19 , further comprising:
an insulating pattern overlapping the pixel-defining layer in a plan view and disposed between the via insulating layer and the first electrode, wherein the first electrode further comprises a third portion extending from the second portion and disposed on a side surface of the insulating pattern.

21 . The display device of claim 15 , wherein a thickness of the light scattering layer is in a range of about 1.5 μm to about 4 μm.

22 . The display device of claim 15 , further comprising:
an encapsulation layer disposed on the second electrode; and a color filter layer disposed on the encapsulation layer.

23 . A light-emitting diode comprising:
a first electrode comprising a first portion and a second portion, the first portion comprising a flat portion and an inclination portion and the second portion surrounding the first portion in a plan view and connected to the flat portion of the first portion by the inclination portion of the first portion; a light scattering layer disposed on the first portion of the first electrode and comprising a scattering body; a light-transmitting conductive layer disposed on the light scattering layer; an emission layer disposed on the light-transmitting conductive layer; and a second electrode disposed on the emission layer.

24 . The light-emitting diode of claim 23 , wherein
an upper surface of the second portion is at a higher level than an upper surface of the flat portion of the first portion, and the inclination portion of the first portion is disposed between t

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Donguk
• Kim Hyunho
• Lee Hoongi

Classifications

• H10H29/855

  Optical field-shaping means, e.g. lenses · CPC title

• H10H20/855

  Optical field-shaping means, e.g. lenses · CPC title

• H10H20/857

  Interconnections, e.g. lead-frames, bond wires or solder balls · CPC title

• H10H20/83

  Electrodes · CPC title

• H10H29/30 Primary

  Active-matrix LED displays · CPC title