Light emitting panel and manufacturing method thereof, and light emitting apparatus

Patent metadata

Field	Value
Publication number	US-12538693-B2
Application number	US-202218026494-A
Country	US
Kind code	B2
Filing date	Jun 29, 2022
Priority date	Jun 29, 2022
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

A light emitting panela includes: a light emitting substrate including at least one light emitting region and a non-light-emitting region surrounding the light emitting region; and an encapsulation layer arranged on a light exiting side of the light emitting substrate, wherein the encapsulation layer includes a first film layer including a plurality of pillars separated from each other and a first medium arranged in gaps between the pillars; wherein a refractive index of the pillars is different from that of the first medium, and a volume ratio of the pillars to the first medium gradually increases or decreases along a first direction, so that an equivalent refractive index of the first film layer gradually decreases along the first direction, the first direction being a direction from a center of the light emitting region to an edge of the light emitting region.

First claim

The invention claimed is:

1 . A light emitting panel, comprising:
a light emitting substrate comprising at least one light emitting region and a non-light-emitting region surrounding the light emitting region; and an encapsulation layer arranged on a light exiting side of the light emitting substrate, wherein the encapsulation layer includes a first film layer including a plurality of pillars separated from each other and a first medium arranged in gaps between the pillars; wherein a refractive index of the pillars is different from that of the first medium, and volume ratios of the pillars to the first medium are increasingly higher or increasingly lower along a first direction, so that an equivalent refractive index of the first film layer is increasingly lower along the first direction, wherein the first direction is a direction from a center of the light emitting region to an edge of the light emitting region; wherein orthographic projections of the plurality of pillars and the first medium on the light emitting substrate cover the at least one light emitting region and at least part of the non-light-emitting region.

2 . The light emitting panel according to claim 1 , wherein the refractive index of the pillars is greater than that of the first medium, and the volume ratios of the pillars to the first medium are increasingly lower along the first direction; or,
the refractive index of the pillars is less than that of the first medium, and the volume ratios of the pillars to the first medium are increasingly higher along the first direction.

3 . The light emitting panel according to claim 2 , wherein the refractive index of the pillars is greater than that of the first medium; along the first direction, sizes of the pillars are increasingly lower or remain unchanged.

4 . The light emitting panel according to claim 3 , wherein the light emitting region is provided with a first side and a second side that are adjacent, and the first side is greater than or equal to the second side;
along a direction from the center of the light emitting region to the first side, a size attenuation rate of the pillars is a first rate; along a direction from the center of the light emitting region to the second side, the size attenuation rate of the pillars is a second rate; wherein the first rate is greater than or equal to the second rate.

5 . The light emitting panel according to claim 1 , wherein the difference between a maximum value of the equivalent refractive index and a minimum value of the equivalent refractive index of the first film layer is greater than or equal to 0.4, and less than or equal to 1.5.

6 . The light emitting panel according to claim 1 , wherein the light emitting panel further comprises:
a leveling layer arranged on a side of the first film layer away from the light emitting substrate; wherein, the first medium includes gas and/or a material of the leveling layer filled in the gaps between the pillars.

7 . The light emitting panel according to claim 1 , wherein the refractive index of the pillars is greater than or equal to 1.5, and less than or equal to 2.5; the refractive index of the first medium is greater than or equal to 1.0, and less than or equal to 1.5.

8 . The light emitting panel according to claim 1 , wherein in a normal direction of the light emitting substrate, a thickness of the pillars is greater than or equal to 300 nm and less than or equal to 4000 nm; and/or
in a direction parallel to a plane where the light emitting substrate is located, sizes of the pillars are greater than or equal to 60 nm and less than or equal to 400 nm; and/or a minimum distance between two adjacent pillars is greater than or equal to 20 nm and less than or equal to 400 nm.

9 . The light emitting panel according to claim 1 , wherein in a normal direction of the light emitting substrate, a thickness of the encapsulation layer is less than or equal to 4000 nm.

10 . The light emitting panel according to claim 1 , wherein a viewing angle range of the light emitting panel is less than that of the light emitting substrate, and the viewing angle range of the light emitting panel is less than or equal to 30°.

11 . The light emitting panel according to claim 1 , wherein the light emitting panel comprises a plurality of pixels, and each of the plurality of pixels includes a red sub-pixel, a blue sub-pixel and a green sub-pixel; the light emitting panel further includes:
a color conversion layer arranged on the light exiting side of the encapsulation layer, and including: a first color conversion pattern in the red sub-pixel, for emitting red light when excited by incident light; a second color conversion pattern in the green sub-pixel, for emitting green light when excited by the incident light; and a transmissive pattern, in the blue sub-pixel, for transmitting the incident light; wherein the incident light includes blue light.

12 . The light emitting panel according to claim 11 , wherein the first color conversion pattern and the second color conversion pattern each comprises one or more of the group of: quantum dots, rare earth materials, fluorescent materials, and organic dyes.

13 . The light emitting panel according to claim 11 , further comprising:
a color filter layer arranged on the light exiting side of the color conversion layer, and including: a first color filter pattern in the red sub-pixel, for transmitting the red light incident to the first color filter pattern; a second color filter pattern in the green sub-pixel, for transmitting the green light incident on the second color filter pattern; and a third color filter pattern in the blue sub-pixel, for transmitting the blue light incident to the third color filter pattern.

14 . The light emitting panel according to claim 13 , wherein the light emitting substrate comprises:
a first substrate baseplate; a plurality of switching elements disposed on the first substrate baseplate; and a plurality of light emitting devices connected to the switching elements, wherein the light emitting devices are in the light emitting region; wherein the encapsulation layer is located on a light exiting side of the light emitting devices; the light emitting panel further includes: a second substrate baseplate disposed on a side of the color filter layer away from the color conversion layer; and a leveling layer arranged between the encapsulation layer and the color conversion layer, for bonding the encapsulation layer and the color conversion layer.

15 . A light emitting apparatus comprising:
the light emitting panel according to claim 1 ; a driving integrated circuit configured to provide a driving signal to the light emitting panel; and a power supply circuit configured to provide power to the light emitting panel.

16 . A light emitting panel, comprising:
a light emitting substrate comprising at least one light emitting region and a non-light-emitting region surrounding the light emitting region; and an encapsulation layer arranged on a light exiting side of the light emitting substrate, wherein the encapsulation layer includes a first film layer including a plurality of pillars separated from each other and a first medium arranged in gaps between the pillars; wherein a refractive index of the pillars is different from that of the first medium, and volume ratios of the pillars to the first medium are increasingly higher or increasingly lower along a first direction, so that an equivalent refractive index of the first film layer is increasingly lower along the first direction, wherein t

Assignees

• Boe Technology Group Co Ltd

Inventors

• Sun Zhongyuan
• Liu Wenqi
• An Che
• Wu Qian
• Huang Wei
• Jiao Zhiqiang
• Yuan Guangcai
• Li Chunyan
• Xu Jingjing

Classifications

• H10K2102/351

  Thickness · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K59/35

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K59/879 Primary

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