CN-121986578-A - Display substrate and display device

CN121986578ACN 121986578 ACN121986578 ACN 121986578ACN-121986578-A

Abstract

A display substrate and a display device are provided. The display substrate comprises a back plate (101), a reflecting layer (202) and a light emitting functional layer, wherein the light emitting functional layer comprises a first light emitting functional layer, a second light emitting functional layer and a third light emitting functional layer, the first light emitting functional layer comprises a first light emitting layer, the first light emitting layer is configured to emit blue light under the action of an electric field, the second light emitting functional layer comprises a second light emitting layer, the second light emitting layer is configured to emit red light under the action of the electric field, the third light emitting layer comprises a third light emitting layer, the third light emitting layer is configured to emit green light under the action of the electric field, the display substrate comprises a first sub-pixel (P1), a second sub-pixel (P2) and a third sub-pixel (P3), the first sub-pixel (P1) has a first distance, the second sub-pixel (P2) has a second distance, the third sub-pixel (P3) has a third distance, and the second distance is the largest among the first distance, the second distance and the third distance.

Inventors

FAN YAN
HAO YANJUN
BAI SHANSHAN
LI NA

Assignees

京东方科技集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20240829

Claims (19)

A display substrate comprises a plurality of sub-pixels, wherein the plurality of sub-pixels at least comprise a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel is configured to emit blue light rays, the second sub-pixel is configured to emit red light rays, and the third sub-pixel is configured to emit green light rays; The display substrate comprises a back plate, a reflecting layer arranged on the back plate and a light-emitting functional layer arranged on one side of the reflecting layer away from the back plate, wherein the light-emitting functional layer at least comprises a first light-emitting functional layer, a second light-emitting functional layer and a third light-emitting functional layer, the first light-emitting functional layer comprises a first light-emitting layer, the first light-emitting layer is configured to emit blue light under the action of an electric field, the second light-emitting functional layer comprises a second light-emitting layer, the second light-emitting layer is configured to emit red light under the action of the electric field, and the third light-emitting functional layer comprises a third light-emitting layer, and the third light-emitting layer is configured to emit green light under the action of the electric field; The first sub-pixel comprises a first light-emitting functional layer, the first sub-pixel is provided with a first distance, the first distance refers to the maximum distance between the first light-emitting layer and the reflecting layer along the direction perpendicular to the plane of the backboard, the second sub-pixel comprises a second light-emitting functional layer, the second sub-pixel is provided with a second distance, the second distance refers to the minimum distance between the second light-emitting layer and the reflecting layer along the direction perpendicular to the plane of the backboard, the third sub-pixel comprises a third light-emitting functional layer, and the third sub-pixel is provided with a third distance, and the third distance refers to the maximum distance between the third light-emitting layer and the reflecting layer along the direction perpendicular to the plane of the backboard; Wherein the second distance is the largest among the first distance, the second distance, and the third distance.
The display substrate of claim 1, wherein the first distance ranges from 110 nanometers to 220 nanometers, the second distance ranges from 180 nanometers to 290 nanometers, and the third distance ranges from 150 nanometers to 260 nanometers.
The display substrate of claim 1, wherein the display substrate further comprises a light conditioning layer between the reflective layer and the light emitting functional layer.
The display substrate according to claim 3, wherein the light emitting functional layer is in contact with the light adjusting layer, and a material of the light adjusting layer is a conductive material.
The display substrate according to claim 3, wherein the display substrate further comprises a connection electrode layer, a portion of the connection electrode layer being located between the light emitting function layer and the light adjustment layer; The material of the connecting electrode layer is transparent conductive material, and the material of the light adjusting layer is non-conductive material.
The display substrate according to claim 5, wherein the connection electrode layer comprises at least a first connection electrode, a second connection electrode, and a third connection electrode, the first light emitting function layer is in contact with a side of the first connection electrode away from the back plate and a side of the first connection electrode close to the back plate is in contact with the reflective layer, the second light emitting function layer is in contact with a side of the second connection electrode away from the back plate and a side of the second connection electrode close to the back plate is in contact with the reflective layer, and the third light emitting function layer is in contact with a side of the third connection electrode away from the back plate and a side of the third connection electrode close to the back plate is in contact with the reflective layer.
The display substrate according to claim 5, wherein the connection electrode layer at least comprises a first connection electrode and a second connection electrode, the first light-emitting functional layer is in contact with one side of the first connection electrode away from the back plate and one side of the first connection electrode close to the back plate is in contact with the reflection layer, the second light-emitting functional layer is in contact with one side of the second connection electrode away from the back plate and one side of the second connection electrode close to the back plate is in contact with the reflection layer, the third light-emitting functional layer is in contact with the reflection layer, and orthographic projection of the light adjusting layer on the plane of the back plate and orthographic projection of the third light-emitting functional layer on the plane of the back plate are not overlapped.
The display substrate of claim 6, wherein the display substrate further comprises a pixel definition layer on a side of the light conditioning layer away from the back plate, the pixel definition layer having at least a first opening through which the first subpixel emits blue light, a second opening through which the second subpixel emits red light, and a third opening through which the third subpixel emits green light; The display substrate at least comprises a first via hole, a second via hole and a third via hole, at least part of the first connecting electrode is located in the first via hole and is in contact with the reflecting layer, the orthographic projection of the first opening on the plane of the backboard is located in the orthographic projection of the first connecting electrode on the plane of the backboard, at least part of the second connecting electrode is located in the second via hole and is in contact with the reflecting layer, the orthographic projection of the second opening on the plane of the backboard is located in the orthographic projection of the second connecting electrode on the plane of the backboard, at least part of the third connecting electrode is located in the third via hole and is in contact with the reflecting layer, and the orthographic projection of the third opening on the plane of the backboard is located in the orthographic projection of the third connecting electrode on the plane of the backboard.
The display substrate of claim 8, wherein the orthographic projection of the first opening on the plane of the back plate does not overlap with the orthographic projection of the first via on the plane of the back plate, the orthographic projection of the second opening on the plane of the back plate does not overlap with the orthographic projection of the second via on the plane of the back plate, the orthographic projection of the third opening on the plane of the back plate does not overlap with the orthographic projection of the third via on the plane of the back plate, or the orthographic projection of the third opening on the plane of the back plate is within the orthographic projection of the third via on the plane of the back plate.
The display substrate of claim 9, wherein the orthographic projection of the third opening on the plane of the back plate is located within the orthographic projection of the third via on the plane of the back plate, and the orthographic projection of the light adjusting layer on the plane of the back plate and the orthographic projection of the third light emitting functional layer on the plane of the back plate do not overlap.
The display substrate of any one of claims 3 to 10, wherein the light conditioning layer is a single film layer or the light conditioning layer comprises two or more film layers.
The display substrate of claim 11, wherein the light adjusting layer comprises at least a first adjusting portion, a second adjusting portion and a third adjusting portion, wherein the orthographic projection of the first adjusting portion on the plane of the back plate and the orthographic projection of the first light emitting functional layer on the plane of the back plate at least partially overlap, the orthographic projection of the second adjusting portion on the plane of the back plate and the orthographic projection of the second light emitting functional layer on the plane of the back plate at least partially overlap, and the orthographic projection of the third adjusting portion on the plane of the back plate and the orthographic projection of the third light emitting functional layer on the plane of the back plate at least partially overlap; at least part of the film layers of at least two of the first adjusting part, the second adjusting part and the third adjusting part are of the same-layer structure.
The display substrate according to any one of claims 3 to 10, wherein the first light-emitting functional layer, the second light-emitting functional layer, and the third light-emitting functional layer are of a same layer structure.
The display substrate according to claim 13, wherein the first light-emitting functional layer, the second light-emitting functional layer, and the third light-emitting functional layer each include the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer that are stacked.
The display substrate according to claim 14, wherein the first light-emitting functional layer, the second light-emitting functional layer, and the third light-emitting functional layer further comprise at least one of a hole transport layer, an electron transport layer, and a charge generation layer.
The display substrate of any one of claims 3 to 10, wherein the display substrate further comprises a pixel definition layer located on a side of the light conditioning layer remote from the back plate, the pixel definition layer having a plurality of pixel openings including at least a first opening through which the first subpixel emits blue light, a second opening through which the second subpixel emits red light, and a third opening through which the third subpixel emits green light; The pixel defining layer also has a plurality of isolation trenches located between two adjacent pixel openings.
The display substrate of claim 16, wherein the wall of the isolation groove comprises a first section and a second section which are connected, the first section is far away from the back plate than the second section, the first section has a first aperture, the second section has a second aperture, and the first aperture is smaller than the second aperture.
A display device comprising the display substrate according to any one of claims 1 to 17.
The display device of claim 18, wherein the display device further comprises a color film structure layer, wherein the color film structure layer comprises a red light filter, a green light filter and a blue light filter, wherein the orthographic projection of the blue light filter on the plane of the back plate at least partially overlaps with the orthographic projection of the first light-emitting function layer on the plane of the back plate, the orthographic projection of the red light filter on the plane of the back plate at least partially overlaps with the orthographic projection of the second light-emitting function layer on the plane of the back plate, and the orthographic projection of the green light filter on the plane of the back plate at least partially overlaps with the orthographic projection of the third light-emitting function layer on the plane of the back plate.

Description

Display substrate and display device Technical Field The present disclosure relates to the field of display technologies, and in particular, to a display substrate and a display device. Background Currently, virtual Reality (VR) technology and augmented Reality (Augmented Reality, AR) technology have gradually penetrated into industries such as entertainment, education, medical, and the like. The small-sized and high-resolution micro-display (microdisplay) device is well suited for application to AR/VR products. An OLED (Organic Light-Emitting Diode) micro display device has been increasingly used in AR/VR display products recently due to its advantages of Light weight, excellent image quality, foldability, low power consumption, etc. Therefore, how to produce an OLED device with high efficiency is very important. Disclosure of Invention The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims. The embodiment of the disclosure provides a display substrate and a display device. In one aspect, embodiments of the present disclosure provide a display substrate. The display substrate comprises a plurality of sub-pixels, wherein the plurality of sub-pixels at least comprise a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel is configured to emit blue light rays, the second sub-pixel is configured to emit red light rays, and the third sub-pixel is configured to emit green light rays; The display substrate comprises a back plate, a reflecting layer arranged on the back plate and a light-emitting functional layer arranged on one side of the reflecting layer away from the back plate, wherein the light-emitting functional layer at least comprises a first light-emitting functional layer, a second light-emitting functional layer and a third light-emitting functional layer, the first light-emitting functional layer comprises a first light-emitting layer, the first light-emitting layer is configured to emit blue light under the action of an electric field, the second light-emitting functional layer comprises a second light-emitting layer, the second light-emitting layer is configured to emit red light under the action of the electric field, and the third light-emitting functional layer comprises a third light-emitting layer, and the third light-emitting layer is configured to emit green light under the action of the electric field; The first sub-pixel comprises a first light-emitting functional layer, the first sub-pixel is provided with a first distance, the first distance refers to the maximum distance between the first light-emitting layer and the reflecting layer along the direction perpendicular to the plane of the backboard, the second sub-pixel comprises a second light-emitting functional layer, the second sub-pixel is provided with a second distance, the second distance refers to the minimum distance between the second light-emitting layer and the reflecting layer along the direction perpendicular to the plane of the backboard, the third sub-pixel comprises a third light-emitting functional layer, and the third sub-pixel is provided with a third distance, and the third distance refers to the maximum distance between the third light-emitting layer and the reflecting layer along the direction perpendicular to the plane of the backboard; Wherein the second distance is the largest among the first distance, the second distance, and the third distance. In an exemplary embodiment, the first distance ranges from 110 nanometers to 220 nanometers, the second distance ranges from 180 nanometers to 290 nanometers, and the third distance ranges from 150 nanometers to 260 nanometers. In an exemplary embodiment, the display substrate further includes a light adjustment layer between the reflective layer and the light emitting functional layer. In an exemplary embodiment, the light emitting functional layer is in contact with the light modulating layer, and the material of the light modulating layer is a conductive material. In an exemplary embodiment, the display substrate further includes a connection electrode layer, a portion of which is located between the light emitting functional layer and the light adjusting layer; The material of the connecting electrode layer is transparent conductive material, and the material of the light adjusting layer is non-conductive material. In an exemplary embodiment, the connection electrode layer at least includes a first connection electrode, a second connection electrode, and a third connection electrode, the first light emitting function layer is in contact with a side of the first connection electrode away from the back plate, and a side of the first connection electrode close to the back plate is in contact with the reflective layer, the second light emitting function layer is in contact with a side of the second connection electrode away from the back plate, and a side of the