CN-117377337-B - Display panel and display device

CN117377337BCN 117377337 BCN117377337 BCN 117377337BCN-117377337-B

Abstract

The application discloses a display panel and a display device, and belongs to the technical field of display. The display panel includes a substrate and a plurality of light emitting units including a first electrode, a light emitting functional layer and a second electrode, the light emitting functional layer including a red light emitting layer, an exciton confinement layer, a green light emitting layer, a charge generating layer and a blue light emitting layer. The red light-emitting layer, the green light-emitting layer and the blue light-emitting layer are connected in series, so that the effect of light-emitting efficiency superposition can be realized. The front projection of the exciton limiting layer on the substrate overlaps with the front projection of the pixel defining layer on the substrate, so that the exciton limiting layer can reduce the electric leakage of the display panel at the edge of the pixel defining layer, and the display effect of the display panel can be improved.

Inventors

MA SIYUAN
Ren Youtao
YANG RUIBO
MA YIWEN
LI YULEI
LI GUIQIN
LI YUHAO
HUANG YINHU
WU CAO
ZHANG DACHENG
CAI QINSHAN
WANG HUANHUAN
SHEN XIAOBIN
TONG HUI

Assignees

京东方科技集团股份有限公司
云南创视界光电科技有限公司
北京京东方技术开发有限公司

Dates

Publication Date: 20260505
Application Date: 20231031

Claims (9)

1. A display panel, the display panel comprising: A substrate; A pixel defining layer on the substrate, the pixel defining layer including a plurality of first openings; The light emitting units are positioned on the substrate and comprise a first electrode, a light emitting functional layer and a second electrode, the light emitting units respectively correspond to the first openings, and the orthographic projection of the light emitting units on the substrate overlaps with the orthographic projection of the corresponding first openings on the substrate; The light-emitting functional layer comprises a red light-emitting layer, an exciton limiting layer, a green light-emitting layer, a charge generation layer and a blue light-emitting layer which are arranged in a stacked manner, wherein the exciton limiting layer is positioned between the red light-emitting layer and the green light-emitting layer, the orthographic projection of the exciton limiting layer on the substrate overlaps with the orthographic projection of the pixel defining layer on the substrate, the exciton limiting layer comprises a second opening, and the orthographic projection of the second opening of the exciton limiting layer in the light-emitting unit on the substrate overlaps with the orthographic projection of the corresponding first opening on the substrate; The surface of the exciton confinement layer close to one side of the green light emitting layer and the surface of the exciton confinement layer close to one side of the red light emitting layer comprise a plasma surface treatment layer or a doping treatment layer.
2. The display panel according to claim 1, wherein the red light-emitting layer and the green light-emitting layer are located on a side of the charge generation layer close to the substrate, the blue light-emitting layer is located on a side of the charge generation layer away from the substrate, and a light emitting direction of the light-emitting unit is parallel to a direction of the substrate toward the light-emitting unit.
3. The display panel according to claim 2, wherein the charge generation layer includes a first charge generation layer on a side of the green light-emitting layer away from the substrate and a second charge generation layer on a side of the first charge generation layer away from the green light-emitting layer, and wherein a kind of majority carriers of the exciton confinement layer is the same as a kind of majority carriers of the first charge generation layer.
4. The display panel according to claim 1, wherein the exciton confinement layer includes a first exciton confinement layer and a second exciton confinement layer, the first exciton confinement layer being located on a side of the second exciton confinement layer adjacent to the red light emitting layer, the second exciton confinement layer being located on a side of the first exciton confinement layer adjacent to the green light emitting layer; the difference between the highest occupied molecular orbital energy level of the first exciton confinement layer and the highest occupied molecular orbital energy level of the red light emitting layer is within a first preset range, and the difference between the highest occupied molecular orbital energy level of the second exciton confinement layer and the highest occupied molecular orbital energy level of the green light emitting layer is within a second preset range.
5. The display panel according to claim 2, wherein the material of the green light-emitting layer comprises a first light-emitting host material and a first light-emitting guest material, and the material of the exciton confinement layer comprises the first light-emitting host material; or the material of the exciton confinement layer includes a hole transport material.
6. The display panel of claim 5, wherein the first light-emitting host material comprises a P-type light-emitting host material or the first light-emitting host material comprises a P-type light-emitting host material and an N-type light-emitting host material.
7. The display panel according to claim 1, wherein the blue light-emitting layer is located on a side of the charge generation layer close to the substrate, the red light-emitting layer and the green light-emitting layer are located on a side of the charge generation layer away from the substrate, and a light-emitting direction of the light-emitting unit is parallel to a direction of the substrate toward the light-emitting unit.
8. The display panel of any one of claims 1 to 7, wherein the exciton confinement layer has a thickness ranging from 15 angstroms to 20 angstroms.
9. A display device comprising a housing and the display panel of any one of claims 1 to 8, the display panel being located in the housing.

Description

Display panel and display device Technical Field The present application relates to the field of display technologies, and in particular, to a display panel and a display device. Background The display panel is a structure having an image display function. A display panel includes a substrate, and a plurality of light emitting units on the substrate, the light emitting units including a first electrode, a light emitting functional layer, and a second electrode. The light-emitting functional layer comprises a red light-emitting layer, a green light-emitting layer, a charge generation layer and a blue light-emitting layer which are arranged in a stacked mode, the red light-emitting layer, the green light-emitting layer and the blue light-emitting layer are connected in series, and the effect of light-emitting efficiency superposition can be achieved. However, the display panel is prone to leakage, so that the display effect of the display panel is poor. Disclosure of Invention The embodiment of the application provides a display panel and a display device, wherein the technical scheme is as follows: According to a first aspect of the present application, there is provided a display panel including: A substrate; A pixel defining layer on the substrate, the pixel defining layer including a plurality of first openings; The light emitting units are positioned on the substrate and comprise a first electrode, a light emitting functional layer and a second electrode, the light emitting units respectively correspond to the first openings, and the orthographic projection of the light emitting units on the substrate overlaps with the orthographic projection of the corresponding first openings on the substrate; The light-emitting functional layer comprises a red light-emitting layer, an exciton limiting layer, a green light-emitting layer, a charge generation layer and a blue light-emitting layer which are arranged in a stacked mode, the exciton limiting layer is located between the red light-emitting layer and the green light-emitting layer, the orthographic projection of the exciton limiting layer on the substrate is overlapped with the orthographic projection of the pixel defining layer on the substrate, the exciton limiting layer comprises a second opening, and the orthographic projection of the second opening of the exciton limiting layer in the light-emitting unit on the substrate is overlapped with the orthographic projection of the corresponding first opening on the substrate. Optionally, the red light emitting layer and the green light emitting layer are located on a side of the charge generating layer close to the substrate, the blue light emitting layer is located on a side of the charge generating layer far away from the substrate, and a light emitting direction of the light emitting unit is parallel to a direction of the substrate towards the light emitting unit. Optionally, the charge generation layer includes a first charge generation layer and a second charge generation layer, the first charge generation layer is located on a side of the green light emission layer away from the substrate, the second charge generation layer is located on a side of the first charge generation layer away from the green light emission layer, and a majority carrier of the exciton confinement layer is the same as a majority carrier of the first charge generation layer. Optionally, the exciton confinement layer includes a first exciton confinement layer and a second exciton confinement layer, the first exciton confinement layer being located at a side of the second exciton confinement layer adjacent to the red light emitting layer, the second exciton confinement layer being located at a side of the first confinement layer adjacent to the green light emitting layer; the difference between the highest occupied molecular orbital energy level of the first exciton confinement layer and the highest occupied molecular orbital energy level of the red light emitting layer is within a first preset range, and the difference between the highest occupied molecular orbital energy level of the second exciton confinement layer and the highest occupied molecular orbital energy level of the green light emitting layer is within a second preset range. Optionally, the material of the green light emitting layer includes a first light emitting host material and a first light emitting guest material, and the material of the exciton confinement layer includes the first light emitting host material; or the material of the exciton confinement layer includes a hole transport material. Optionally, the first light-emitting host material comprises a P-type light-emitting host material, or the first light-emitting host material comprises a P-type light-emitting host material and an N-type light-emitting host material. Optionally, the blue light emitting layer is located at a side of the charge generating layer close to the substrate, the red light emitting la