US-12628498-B2 - Display substrate for avoiding lateral leakage and preparation method therefor, and display apparatus

US12628498B2US 12628498 B2US12628498 B2US 12628498B2US-12628498-B2

Abstract

A display substrate, comprising: a first electrode layer, which is located on one side of a drive backplane and which comprises a plurality of first electrodes that are distributed in an array; a leakage cutoff layer, which is located on the side of the first electrode layer facing away from the drive backplane and is located between two adjacent first electrodes, the surface of the leakage cutoff layer on the side facing away from the drive backplane having a cutoff recess and cutoff protrusions located on both sides of the cutoff recess; a light-emitting functional layer, which is located on the side of the leakage cutoff layer and the first electrode layer facing away from the drive backplane; and a second electrode layer, which is located on the side of the light-emitting functional layer facing away from the drive backplane.

Inventors

Qing Wang
Kuanta HUANG
Xiaochuan Chen
Yongfa DONG
Xiong YUAN
Hui Tong
Yu Wang

Assignees

BOE TECHNOLOGY GROUP CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20210514
Priority Date: 20200619

Claims (19)

1 . A display substrate, comprising: a driving backplane; a first electrode layer located at one side of the driving backplane, the first electrode layer comprising a plurality of first electrodes distributed in an array; a leakage cutoff layer located at one side of the first electrode layer away from the driving backplane, the leakage cutoff layer being located between two adjacent first electrodes, and there being a cutoff groove and cutoff protrusions located at both sides of the cutoff groove on a surface of one side of the leakage cutoff layer away from the driving backplane; a light emitting functional layer located at one side of the leakage cutoff layer and the first electrode layer away from the driving backplane; and a second electrode layer located at one side of the light emitting functional layer away from the driving backplane; wherein a first electrode of the plurality of first electrodes comprises a flat middle portion and a climbing portion surrounding the middle portion; the second electrode layer comprises a plurality of gentle portions and connecting portions located between two adjacent gentle portions, wherein a gentle portion of the plurality of gentle portions corresponds to the middle portion; in a direction perpendicular to the driving backplane, the thickness of the light emitting functional layer located between the gentle portion and the middle portion is d 0 , and the minimum distance between a cutoff protrusion of the cutoff protrusions and the middle portion is d 1 , a ratio of d 1 to d 0 ranging from 0.3 to 0.8; when the light emitting functional layer is evaporated, a first hole injection layer of the light emitting functional layer is cut off by the leakage cutoff layer.
2 . The display substrate according to claim 1 , wherein a distance between the cutoff groove and the cutoff protrusion in the direction perpendicular to the driving backplane is d 2 , and a ratio of d 2 to d 0 ranges from 0.1 to 0.4.
3 . The display substrate according to claim 1 , wherein the leakage cutoff layer has a cutoff side surface facing the first electrode, the leakage cutoff layer shrinks from the driving backplane towards a direction away from the driving backplane, and an angle between the cutoff side surface and a surface of one side of the leakage cutoff layer facing the driving backplane is 60° to 90°.
4 . The display substrate according to claim 1 , wherein the leakage cutoff layer has a cutoff side surface facing the first electrode, the leakage cutoff layer expands from the driving backplane towards a direction away from the driving backplane, and an angle between the cutoff side surface and a surface of one side of the leakage cutoff layer facing the driving backplane is 90° to 120°.
5 . The display substrate according to claim 1 , wherein an orthographic projection of the leakage cutoff layer on the driving backplane is between orthographic projections of two adjacent middle portions on the driving backplane.
6 . The display substrate according to claim 1 , wherein an orthographic projection of the leakage cutoff layer on the driving backplane at least overlaps with an orthographic projection of the middle portion located at one side of the leakage cutoff layer on the driving backplane.
7 . The display substrate according to claim 6 , wherein in a direction perpendicular to the driving backplane, a distance between the cutoff protrusion and the middle portion is d 1 , the thickness of the middle portion is d 3 , and a ratio of d 3 to d 1 is 2 to 4.
8 . The display substrate according to claim 6 , wherein in a direction perpendicular to the driving backplane, the thickness of the light emitting functional layer located between the gentle portion and the middle portion is d 0 , the depth of the cutoff groove is d 2 , and a ratio of d 2 to d 0 is 0.2 to 0.8.
9 . The display substrate according to claim 8 , wherein the depth of the cutoff groove is greater than or equal to the thickness of the middle portion.
10 . The display substrate according to claim 1 , wherein the light emitting functional layer comprises a first light emitting unit layer, a charge generation layer and a second light emitting unit layer which are sequentially stacked from the first electrode layer towards the second electrode layer, and the first light emitting unit layer comprises the first hole injection layer, a first hole transport layer, a first light emitting layer, a second light emitting layer and a first electron transport layer which are sequentially stacked from the first electrode layer towards the second electrode layer.
11 . The display substrate according to claim 10 , wherein the thickness of the charge generation layer is 100 angstroms to 200 angstroms; the thickness of the first hole injection layer is 70 angstroms to 130 angstroms; or the thickness of the first hole transport layer is 70 angstroms to 130 angstroms; or the thickness of the first light emitting layer is 70 angstroms to 130 angstroms; or the thickness of the second light emitting layer is 250 angstroms to 350 angstroms; or the thickness of the first electron transport layer is 150 angstroms to 250 angstroms.
12 . The display substrate according to claim 10 , wherein the first light emitting layer is a red light emitting layer and the second light emitting layer is a green light emitting layer.
13 . The display substrate according to claim 1 , wherein the light emitting functional layer comprises a first light emitting unit layer, a charge generation layer and a second light emitting unit layer which are sequentially stacked from the first electrode layer towards the second electrode layer, and the second light emitting unit layer comprises a second hole injection layer, a second hole transport layer, a third light emitting layer, a second electron transport layer and a second electron injection layer which are sequentially stacked from the first electrode layer towards the second electrode layer.
14 . The display substrate according to claim 13 , wherein the thickness of the second hole injection layer is 70 angstroms to 130 angstroms; or the thickness of the second hole transport layer is 70 angstroms to 130 angstroms; or the thickness of the third light emitting layer is 200 angstroms to 300 angstroms; or the thickness of the second electron transport layer is 250 angstroms to 350 angstroms; or the thickness of the second electron injection layer is 800 angstroms to 1000 angstroms.
15 . The display substrate according to claim 13 , wherein the third light emitting layer is a blue light emitting layer.
16 . The display substrate according to claim 1 , wherein a connecting portion of the connecting portions comprises a convex portion and concave portions located at both sides of the convex portion, the convex portion protrudes towards a side away from the driving backplane, the concave portion is recessed towards a side of the driving backplane, the concave portion connects the convex portion with the gentle portion, and a distance between a position of the concave portion closest to the driving backplane and the middle portion in the direction perpendicular to the driving backplane is 100 nm to 300 nm.
17 . The display substrate according to claim 16 , wherein a distance between the position of the concave portion closest to the driving backplane and a surface of one side of the gentle portion facing the driving backplane in the direction perpendicular to the driving backplane is less than 60 nm.
18 . A display apparatus, comprising the display substrate according to claim 1 .
19 . A method for preparing a display substrate, comprising: forming a first electrode layer on a surface of one side of a driving backplane, the first electrode layer comprising a plurality of first electrodes distributed in an array; forming a leakage cutoff layer on the surface of the driving backplane, on which the first electrode layer is formed, the leakage cutoff layer being located between two adjacent first electrodes, and there being a cutoff groove and cutoff protrusions located at both sides of the cutoff groove on a surface of one side of the leakage cutoff layer away from the driving backplane; forming a light emitting functional layer at one side of the leakage cutoff layer and the first electrode layer away from the driving backplane; and forming a second electrode layer at one side of the light emitting functional layer away from the driving backplane; wherein a first electrode of the plurality of first electrodes comprises a flat middle portion and a climbing portion surrounding the middle portion; the second electrode layer comprises a plurality of gentle portions and connecting portions located between two adjacent gentle portions, wherein a gentle portion of the plurality of gentle portions corresponds to the middle portion; in a direction perpendicular to the driving backplane, the thickness of the light emitting functional layer located between the gentle portion and the middle portion is d 0 , and the minimum distance between a cutoff protrusion of the cutoff protrusions and the middle portion is d 1 , a ratio of d 1 to d 0 ranging from 0.3 to 0.8; when the light emitting functional layer is evaporated, a first hole injection layer of the light emitting functional layer is cut off by the leakage cutoff layer.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a national stage application of PCT Application No. PCT/CN2021/093943, which is filed on May 14, 2021 and claims priority to Chinese Patent Application No. 202010565939.8, entitled “Display Substrate and Preparation Method Therefor, and Display Apparatus” and filed with the CNIPA on Jun. 19, 2020, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD The present disclosure relates to, but is not limited to, the field of display technology, and particularly, to a display substrate and a preparation method therefor, and a display apparatus. BACKGROUND In recent years, as near-eye displays, silicon-based Organic Light-Emitting Diode (OLED) micro displays are often used in the field of Virtual Reality (VR)/Augmented Reality (AR). The silicon-based semiconductor process is mature and has high integration, enabling ultra-high pixels per inch (PPI) display. It is found in use that there is cross color or crosstalk in silicon-based OLED micro displays, which affects the color gamut of the displays and decreases the quality and color purity of the displays. SUMMARY The following is a summary about the subject matter described herein in detail. The summary is not intended to limit the protection scope of the claims. In a first aspect, an embodiment of the present disclosure provides a display substrate, including: a driving backplane;a first electrode layer located at one side of the driving backplane, the first electrode layer including a plurality of first electrodes distributed in an array;a leakage cutoff layer located at one side of the first electrode layer away from the driving backplane, the leakage cutoff layer being located between two adjacent first electrodes, and there being a cutoff groove and cutoff protrusions located at both sides of the cutoff groove on a surface of one side of the leakage cutoff layer away from the driving backplane;a light emitting functional layer located at one side of the leakage cutoff layer and the first electrode layer away from the driving backplane; anda second electrode layer located at one side of the light emitting functional layer away from the driving backplane. In some possible implementations, the first electrode includes a flat middle portion and a climbing portion surrounding the middle portion, the second electrode layer includes a plurality of gentle portions corresponding to the middle portions and connecting portions located between two adjacent gentle portions, and in a direction perpendicular to the driving backplane, the thickness of the light emitting functional layer located between the gentle portion and the middle portion is d0, the minimum distance between the cutoff protrusion and the middle portion is d1, and a ratio of d1 to d0 ranges from 0.3 to 0.8. In some possible implementations, a distance between the cutoff groove and the cutoff protrusion in the direction perpendicular to the driving backplane is d2, and a ratio of d2 to d0 ranges from 0.1 to 0.4. In some possible implementations, the leakage cutoff layer has a cutoff side surface facing the first electrode, the leakage cutoff layer shrinks from the driving backplane towards a direction away from the driving backplane, and an angle between the cutoff side surface and a surface of one side of the leakage cutoff layer facing the driving backplane is 60 to 90°. In some possible implementations, the leakage cutoff layer has a cutoff side surface facing the first electrode, the leakage cutoff layer expands from the driving backplane towards a direction away from the driving backplane, and an angle between the cutoff side surface and a surface of one side of the leakage cutoff layer facing the driving backplane is 90 to 120°. In some possible implementations, the first electrode includes a flat middle portion and a climbing portion surrounding the middle portion, and an orthographic projection of the leakage cutoff layer on the driving backplane is between orthographic projections of two adjacent middle portions on the driving backplane. In some possible implementations, the first electrode includes a flat middle portion and a climbing portion surrounding the middle portion, and an orthographic projection of the leakage cutoff layer on the driving backplane at least overlaps with an orthographic projection of the middle portion located at one side of the leakage cutoff layer on the driving backplane. In some possible implementations, in the direction perpendicular to the driving backplane, a distance between the cutoff protrusion and the middle portion is d1, the thickness of the middle portion is d3, and a ratio of d3 to d1 is 2 to 4. In some possible implementations, in the direction perpendicular to the driving backplane, the thickness of the light emitting functional layer located between the gentle portion and the middle portion is d0, the depth of the cutoff groove is d2, and a ratio of d2 to d0 is