Pixel defining layer, organic light-emitting diode display panel, and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-12004375-B2
Application number	US-202017280298-A
Country	US
Kind code	B2
Filing date	Jun 5, 2020
Priority date	Jun 14, 2019
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

Provided is a pixel defining layer of an organic light-emitting diode display panel. The pixel defining layer includes: an insulating transparent cladding layer; and a reflecting layer in the transparent cladding layer, wherein the reflecting layer is configured to reflect light emitted from a light-emitting layer of the organic light-emitting diode display panel. Organic light-emitting diode display panels and methods for manufacturing an organic light-emitting diode display panel are also provided.

First claim

What is claimed is:

1. A pixel defining layer of an organic light-emitting diode display panel, comprising:
an insulating transparent cladding layer; and
a reflecting layer covered by the transparent cladding layer, wherein the reflecting layer is configured to reflect light emitted from a light-emitting layer of the organic light-emitting diode display panel;
wherein the reflecting layer is spaced from the light-emitting layer by the transparent cladding layer, such that the reflecting layer is not in contact with the light-emitting layer; and a thickness of the reflecting layer is not less than a thickness of the light-emitting layer in a direction perpendicular to a substrate of the organic light-emitting diode display panel.

2. The pixel defining layer according to claim 1 , wherein the thickness of the reflecting layer ranges from 0.5 μm to 1.4 μm, and the thickness of the light-emitting layer is less than 0.4 μm.

3. The pixel defining layer according to claim 1 , wherein a side of the reflecting layer proximal to the light-emitting layer surrounded by the reflecting layer is inclined, and an area of a side of the reflecting layer distal from the substrate of the organic light-emitting diode display panel is less than an area of a side of the reflecting layer proximal to the substrate.

4. The pixel defining layer according to claim 3 , wherein an angle between the inclined side surface of the reflecting layer and the substrate of the organic light-emitting diode display panel is greater than or equal to 15° and less than or equal to 30°.

5. The pixel defining layer according to claim 3 , wherein a reflectivity of the reflecting layer is greater than 90%.

6. The pixel defining layer according to claim 1 , wherein the reflecting layer is a metal layer.

7. The pixel defining layer according to claim 6 , wherein a material of the metal layer is Ag or Al.

8. The pixel defining layer according to claim 1 , wherein the transparent cladding layer is provided with a plurality of grooves, wherein a side of the groove proximal to the light-emitting layer surrounded by the groove is inclined, and an area of a side of the groove distal from the substrate of the organic light-emitting diode display panel is greater than an area of a side of the groove proximal to the substrate.

9. The pixel defining layer according to claim 8 , wherein an angle between a side of the groove and the substrate is greater than or equal to 25° and less than or equal to 30°.

10. The pixel defining layer according to claim 8 , wherein a transparency of the transparent cladding layer is greater than 90%.

11. An organic light-emitting diode display panel, comprising:
a substrate;
a pixel defining layer; and
a device layer in a groove defined by the pixel defining layer;
wherein the pixel defining layer comprises:
an insulating transparent cladding layer; and

a reflecting layer covered by the transparent cladding layer, wherein the reflecting layer is configured to reflect light emitted from a light-emitting layer of the organic light-emitting diode display panel;
wherein the reflecting layer is spaced from the light-emitting layer by the transparent cladding layer, such that the reflecting layer is not in contact with the light-emitting layer; and a thickness of the reflecting layer is not less than a thickness of the light-emitting layer in a direction perpendicular to a substrate of the organic light-emitting diode display panel.

12. The organic light-emitting diode display panel according to claim 11 , wherein the device layer comprises:
a reflecting electrode;
a light-emitting layer on the reflecting electrode; and
a transparent electrode on the light-emitting layer.

13. The organic light-emitting diode display panel according to claim 12 , wherein
a material of the reflecting electrode is Ag or an ITO—Ag—ITO alloy; and
a material of the transparent electrode is one of Ag, Al, a Mg—Ag alloy, and a Mg—Al alloy.

14. A method for manufacturing an organic light-emitting diode display panel, wherein the organic light-emitting diode display panel comprises: a substrate, a pixel defining layer, and a device layer in a groove defined by the pixel defining layer; wherein the pixel defining layer comprises: an insulating transparent cladding layer, and a reflecting layer covered by the transparent cladding layer, wherein the reflecting layer is configured to reflect light emitted from a light-emitting layer of the organic light-emitting diode display panel; wherein the reflecting layer is spaced from the light-emitting layer by the transparent cladding layer, such that the reflecting layer is not in contact with the light-emitting layer; and a thickness of the reflecting layer is not less than a thickness of the light-emitting layer in a direction perpendicular to a substrate of the organic light-emitting diode display panel, the method comprises:
forming a pixel defining layer on the substrate; and
forming a device layer in a groove defined by the pixel defining layer.

15. The method according to claim 14 , wherein forming the device layer in the groove defined by the pixel defining layer comprises:
forming, before the pixel defining layer is manufactured, a first metal layer on the substrate;
forming the reflecting electrode by patterning the first metal layer; and
forming the device layer by forming the light-emitting layer and the transparent electrode sequentially on the reflecting electrode.

16. The method according to claim 15 , wherein forming the pixel defining layer on the substrate comprises:
forming a second metal layer to cover the reflecting electrode and the substrate;
forming the reflecting layer by patterning the second metal layer, wherein the reflecting layer surrounds the exposed reflecting electrode and is electrically isolated from the reflecting electrode;
forming a polyimide layer to cover the reflecting layer and the reflecting electrode; and
forming the transparent cladding layer by patterning the polyimide layer, wherein the pixel defining layer is formed by the transparent cladding layer and the reflecting layer, and the pixel defining layer covers the reflecting electrode and surrounds the exposed reflecting electrode.

17. The method according to claim 16 , wherein after forming the reflecting electrode by patterning the first metal layer and before forming the second metal layer to cover the reflecting electrode and the substrate, the method further comprises:
forming an inorganic thin film layer to cover the reflecting electrode and the exposed substrate.

18. The method according to claim 17 , wherein forming the second metal layer to cover the reflecting electrode and the substrate and forming the reflecting layer by patterning the second metal layer comprises:
forming the second metal layer to cover the inorganic thin film layer; and
exposing the reflecting electrode by patterning the second metal layer, and forming the reflecting layer on the non-patterned inorganic thin film layer.

Assignees

• Chengdu Boe Optoelect Tech Co
• Boe Technology Group Co Ltd

Inventors

• Xu Biao
• Hu Hungchieh
• Yang Heng

Classifications

• H10K59/878

  comprising reflective means · CPC title

• H10K59/80524

  Transparent cathodes, e.g. comprising thin metal layers · CPC title

• H10K59/80518

  Reflective anodes, e.g. ITO combined with thick metallic layers · CPC title

• H10K59/122 Primary

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

• H10K50/856

  comprising reflective means · CPC title