Display panel and manufacturing method thereof, display device with improved brightness uniformity

Patent metadata

Field	Value
Publication number	US-12022693-B2
Application number	US-202117352447-A
Country	US
Kind code	B2
Filing date	Jun 21, 2021
Priority date	Aug 21, 2020
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

The present application discloses a display panel, and a manufacturing method thereof, and a display device, which belong to the field of display technologies. The display panel includes a substrate, and a pixel defining layer and a light-emitting device which are disposed on the substrate. In the light-emitting device, a central region of the light-emitting layer covers a first electrode, and a peripheral region of the light-emitting layer is staggered from the first electrode.

First claim

What is claimed is:

1. A display panel, comprising:
a substrate;
a pixel defining layer disposed on the substrate, wherein the pixel defining layer is configured to define a plurality of sub-pixel regions on the substrate; and
a light-emitting device disposed in each of the sub-pixel regions, wherein the light-emitting device comprises a first electrode and a light-emitting layer which are laminated in a direction perpendicular to and away from the substrate;
wherein the light-emitting layer has a central region and a peripheral region surrounding the central region, the central region of the light-emitting layer covers the first electrode, and the peripheral region of the light-emitting layer is staggered from the first electrode,
wherein the display panel further comprises an optical adjustment layer disposed on a side of the light-emitting device away from the substrate, an optical uniform layer disposed on a side of the optical adjustment layer away from the substrate, a planarization layer disposed between the optical uniform layer and the optical adjustment layer, and a light-reflecting structure disposed on a side of the planarization layer away from the substrate, wherein the optical adjustment layer is configured to adjust light from the light-emitting device to increase a light-emergent range of the light-emitting device, and the optical uniform layer is configured to adjust light from the optical adjustment layer to divergent light;
wherein the light-reflecting structure comprises an organic layer and a metal layer which are laminated in a direction parallel to the substrate, wherein the organic layer has a film layer accommodating region for accommodating the optical uniform layer, the metal layer is ring-shaped and is disposed in the film layer accommodating region, the optical uniform layer is disposed in a region defined by an inner ring of the metal layer and is in contact with the metal layer, such that the light-reflecting structure is disposed around the optical uniform layer, and the metal layer is disposed between the organic layer and the optical uniform layer.

2. The display panel according to claim 1 , wherein a pattern formed by an outer boundary of the central region of the light-emitting layer is congruent with a pattern formed by an outer boundary of the first electrode.

3. The display panel according to claim 1 , wherein a thickness at each position in the central region of the light-emitting layer is the same.

4. The display panel according to claim 1 , wherein the pixel defining layer comprises a pixel defining structure and a ring-shaped auxiliary support structure connected to the pixel defining structure, the pixel defining structure is configured to define the plurality of sub-pixel regions on the substrate, and the auxiliary support structure is disposed in each of the sub-pixel regions; and
the first electrode is disposed in a region defined by an inner ring of the auxiliary support structure, and a thickness of the auxiliary support structure is the same as a thickness of the first electrode.

5. The display panel according to claim 4 , wherein a pattern formed by the outer boundary of the first electrode is congruent with a pattern formed by an inner boundary of the auxiliary support structure.

6. The display panel according to claim 1 , wherein the light-emitting layer is formed by an inkjet printing process, and a thickness of the central region of the light-emitting layer is less than a thickness of the peripheral region of the light-emitting layer.

7. The display panel according to claim 1 , wherein the optical adjustment layer comprises a plurality of sub-optical adjustment layers which are laminated, and each of at least two adjacent sub-optical adjustment layers in the plurality of sub-optical adjustment layers satisfies: a refractive index of the sub-optical adjustment layer on a side close to the light-emitting device is greater than a refractive index of the sub-optical adjustment layer on a side away from the light-emitting device.

8. The display panel according to claim 7 , wherein refractive indexes of the plurality of sub-optical adjustment layers sequentially decrease in the direction perpendicular to and away from the substrate.

9. The display panel according to claim 7 , wherein a material of each of the plurality of sub-optical adjustment layers comprises an inorganic material.

10. The display panel according to claim 7 , wherein a refractive index of each of the plurality of sub-optical adjustment layers ranges from 1.8 to 2.6.

11. The display panel according to claim 10 , wherein the light-emitting device further comprises a second electrode disposed on a side of the light-emitting layer away from the first electrode; and
the substrate comprises a driving circuit electrically connected to the light-emitting device.

12. The display panel according to claim 1 , wherein the optical uniform layer comprises a light-transmitting dielectric layer, and a plurality of scattering particles are filled in the light-transmitting dielectric layer.

13. The display panel according to claim 12 , wherein a refractive index of the light-transmitting dielectric layer is less than a refractive index of the optical adjustment layer.

14. The display panel according to claim 1 , wherein the light-reflecting structure comprises an organic layer having light-reflecting properties.

15. A display device, comprising the display panel of claim 1 .

16. The display panel according to claim 1 , wherein the display panel further comprises an encapsulation layer disposed on a side of the optical uniform layer away from the substrate, and the encapsulation layer comprises multiple inorganic layers and organic layers which are alternately disposed.

17. A method for manufacturing a display panel, comprising
forming a pixel defining layer and a light-emitting device on a substrate; and
forming an optical adjustment layer, an optical uniform layer, a planarization layer, and a light-reflecting structure, wherein the optical adjustment layer is disposed on a side of the light-emitting device away from the substrate, the optical uniform layer is disposed on a side of the optical adjustment layer away from the substrate, the planarization layer is disposed between the optical uniform layer and the optical adjustment layer, and the light-reflecting structure is disposed on a side of the planarization layer away from the substrate;
wherein the optical adjustment layer is configured to adjust light from the light-emitting device to increase a light-emergent range of the light-emitting device, and the optical uniform layer is configured to adjust light from the optical adjustment layer to divergent light;
wherein the light-reflecting structure comprises an organic layer and a metal layer which are laminated in a direction parallel to the substrate, wherein the organic layer has a film layer accommodating region for accommodating the optical uniform layer, the metal layer is ring-shaped and is disposed in the film layer accommodating region, the optical uniform layer is disposed in a region defined by an inner ring of the metal layer and is in contact with the metal layer, such that the light-reflecting structure is disposed around the optical uniform layer, and the metal layer is disposed between the organic layer and the optical uniform layer;
wherein the pixel defining layer is configured to define a plurality of sub-pixel regions on the substrate, the light-emitting device is disposed in each of the sub-pixel regions, and the light-emitting device comprises a first

Assignees

• Boe Technology Group Co Ltd

Inventors

• Jin Qian
• Huang Wei
• Sui Kai

Classifications

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title

• H10K59/878

  comprising reflective means · CPC title

• H10K59/877

  comprising scattering means · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K71/135

  using ink-jet printing · CPC title