US-12622060-B2 - Display substrate, method for preparing display substrate, and display device

US12622060B2US 12622060 B2US12622060 B2US 12622060B2US-12622060-B2

Abstract

Multiple first recesses are formed on the side of an inorganic insulating layer facing towards multiple LEDs. Orthographic projections of the first recesses on a driving substrate do not overlap orthographic projections of the LEDs on the driving substrate. Thus, when a first planarization layer covering the multiple LEDs is formed on the side of the multiple LEDs facing away from the driving substrate, the first recesses can be filled with the first planarization layer, so that a contact area between the first planarization layer and the inorganic insulating layer can be increased, a binding force between the first planarization layer and the inorganic insulating layer can be increased, and the risk of peeling off the first planarization layer can be reduced, thereby improving the stability of a QD-LED device.

Inventors

Tianhao Lu
Dejiang Zhao
Qian Sun
Wei Huang

Assignees

BOE TECHNOLOGY GROUP CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20210520
Priority Date: 20200610

Claims (14)

1 . A display substrate, comprising: a driving substrate; a plurality of LEDs, arranged on the driving substrate in an array; an inorganic insulating layer, located between the driving substrate and the plurality of LEDs; wherein a plurality of first recesses are provided in one side of the inorganic insulating layer facing the plurality of LEDs, and orthographic projections of all of the plurality of first recesses on the driving substrate do not overlap orthographic projections of the LEDs on the driving substrate; a first planarization layer, covering the plurality of LEDs, wherein the first planarization layer comprises a plurality of bulges filling the first recesses provided on one side of the first planarization layer facing the driving substrate; and a blocking dam structure located on one side of the first planarization layer facing away from the driving substrate; wherein the blocking dam structure is provided with a plurality of pixel openings penetrating through the blocking dam structure, the pixel openings are in one-to-one correspondence with the LEDs, and the orthographic projections of the pixel openings on the driving substrate completely cover the orthographic projections of the LEDs on the driving substrate; and the pixel openings comprise: a first sub-pixel opening, and a second sub-pixel opening, wherein a red quantum dot color film is disposed in the first sub-pixel opening, and a green quantum dot color film is disposed in the second sub-pixel opening; one side of the first planarization layer facing the blocking dam structure is provided with a plurality of second recesses, and the second recesses are filled with the blocking dam structure.
2 . The display substrate of claim 1 , wherein the inorganic insulating layer comprises: a first insulating layer located between the driving substrate and the plurality of LEDs, and a second insulating layer located between the first insulating layer and the plurality of LEDs; wherein the second insulating layer and the first insulating layer are different in material; and the plurality of first recesses are provided in one side of the second insulating layer facing the plurality of LEDs.
3 . The display substrate of claim 2 , wherein: a thickness of the first insulating layer is 0.2 μm-1 μm, and a thickness of the second insulating layer is 2 μm-3 μm.
4 . The display substrate of claim 1 , wherein: the inorganic insulating layer is a single inorganic insulating layer, and a thickness of the single inorganic insulating layer is 2 μm-3 μm.
5 . The display substrate of claim 1 , wherein the pixel openings further comprise: a third sub-pixel opening; wherein the third sub-pixel opening is filled with scattered particles.
6 . The display substrate of claim 1 , wherein the first planarization layer internally is provided with a plurality of scattered particles.
7 . The display substrate of claim 1 , further comprising: an encapsulation layer, covering the red quantum dot color film, the green quantum dot color film, and the blocking dam structure.
8 . The display substrate of claim 1 , wherein in a direction perpendicular to a thickness of the driving substrate, a cross section shape of the first recess is one or a combination of an isosceles trapezoid, a right-angled trapezoid, or a rectangle.
9 . The display substrate of claim 1 , wherein the driving substrate comprises: a base substrate, a drive circuit on one side of the base substrate facing the LEDs, a second planarization layer on one side of the drive circuit facing the LEDs, and a first electrode and a second electrode which are located on one side of the second planarization layer facing the LEDs; wherein the first electrode is electrically connected with the drive circuit through a first via hole penetrating through the second planarization layer, and the second electrode is grounded; and a third electrode and a fourth electrode are located on one side of the LEDs facing the driving substrate, the third electrode is electrically connected with the first electrode through a second via hole penetrating through the inorganic insulating layer, and the fourth electrode is electrically connected with the second electrode through a third via hole penetrating through the inorganic insulating layer.
10 . The display substrate of claim 9 , wherein a thickness of the third electrode is greater than a depth of the second via hole.
11 . The display substrate of claim 10 , wherein the third electrode comprises a portion located in the second via hole and a portion extending outward from the second via hole in a direction away from the base substrate.
12 . The display substrate of claim 9 , wherein the third electrode and the fourth electrode are located on a side of the first electrode and the second electrode facing away from the base substrate.
13 . The display substrate of claim 1 , wherein the LEDs are Micro LEDs.
14 . A display apparatus, comprising the display substrate according to claim 1 .

Description

CROSS REFERENCE TO RELATED APPLICATIONS The present disclosure is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/CN2021/094918, filed on May 20, 2021, which claims the priority of Chinese Patent Application No. 202010524566.X, filed with the China National Intellectual Property Administration on Jun. 10, 2020 and entitled “DISPLAY PANEL, MANUFACTURING METHOD THEREFOR, AND DISPLAY APPARATUS”, the entire contents of which are incorporated herein by reference. FIELD The present disclosure relates to the technical field of display, in particular to a display substrate, a manufacturing method therefor, and a display apparatus. BACKGROUND LED has advantages of low power consumption and high brightness, and a photoinduced quantum dot (QD) material has a wide color gamut and pure light color, therefore a QD-LED device structure provides an opportunity to achieve high-quality display with low power consumption, high brightness and wide color gamut. SUMMARY Embodiments of the present disclosure provide a display substrate, including: a driving substrate;a plurality of LEDs, arranged on the driving substrate in an array;an inorganic insulating layer, located between the driving substrate and the plurality of LEDs; wherein a plurality of first recesses are provided in one side of the inorganic insulating layer facing the plurality of LEDs, and orthographic projections of the first recesses on the driving substrate do not overlap orthographic projections of the LEDs on the driving substrate; anda first planarization layer, covering the plurality of LEDs, wherein a plurality of bulges filling the first recesses are provided on one side of the first planarization layer facing the driving substrate. Optionally, during implementations, in the above display substrate provided by the embodiments of the present disclosure, the inorganic insulating layer includes: a first insulating layer located between the driving substrate and the plurality of LEDs, and a second insulating layer located between the first insulating layer and the plurality of LEDs. The second insulating layer and the first insulating layer are different in material. The plurality of first recesses are formed in one side of the second insulating layer facing the plurality of LEDs. Optionally, during implementations, in the above display substrate provided by the embodiments of the present disclosure, a thickness of the first insulating layer is 0.2 μm-1 μm, and a thickness of the second insulating layer is 2 μm-3 μm. Optionally, during implementations, in the above display substrate provided by the embodiments of the present disclosure, the inorganic insulating layer is a single inorganic insulating layer, and a thickness of the single inorganic insulating layer is 2 μm-3 μm. Optionally, during implementations, the above display substrate provided by the embodiments of the present disclosure further includes a blocking dam structure located on one side of the first planarization layer facing away from the driving substrate. The blocking dam structure has a plurality of pixel openings, and the pixel openings are in one-to-one correspondence with the LEDs. The pixel openings include a first sub-pixel opening and a second sub-pixel opening. A red quantum dot color film is disposed in the first sub-pixel opening, and a green quantum dot color film is disposed in the second sub-pixel opening. Optionally, during implementations, in the above display substrate provided by the embodiments of the present disclosure, the pixel openings further include a third sub-pixel opening, and the third sub-pixel opening is filled with scattered particles. Optionally, during implementations, in the above display substrate provided by the embodiments of the present disclosure, the first planarization layer internally has a plurality of scattered particles. Optionally, during implementations, in the above display substrate provided by the embodiments of the present disclosure, one side of the first planarization layer facing the blocking dam structure is provided with a plurality of second recesses, and the second recesses are filled with the blocking dam structure. Optionally, during implementations, the above display substrate provided by the embodiments of the present disclosure further includes an encapsulation layer, covering the red quantum dot color film, the green quantum dot color film, and the blocking dam structure. Optionally, during implementations, in the above display substrate provided by the embodiments of the present disclosure, in a direction perpendicular to a thickness of a driving substrate, a cross section shape of the first recess is one or a combination of an isosceles trapezoid, a right-angled trapezoid, or a rectangle. Optionally, during implementations, in the above display substrate provided by the embodiments of the present disclosure, the driving substrate includes: a base substrate, a drive circuit located on one side