US-20260130057-A1 - DISPLAY PANEL, PREPARATION METHOD THEREFOR, AND DISPLAY DEVICE

Abstract

The present application provides a display panel, preparation method thereof, and display device. The display panel includes a substrate; an insulating layer disposed on the substrate, with a plurality of first electrodes spaced apart from each other on a side of the insulating layer away from the substrate; a pixel defining layer disposed on the side of the insulating layer away from the substrate and having a plurality of pixel openings, wherein the pixel openings expose portions of the first electrodes and cover edges of the first electrodes, and gaps exist between the edges of the first electrodes and the insulating layer, improving inorganic cracks at the boundaries of the first electrodes and enhancing the encapsulation effect of the display area.

Inventors

• Zhiwei Zhou
• PENG QIN
• Yang Yang
• Jinfang Zhang

Assignees

• Hefei Visionox Technology Co., Ltd.
• VISIONOX TECHNOLOGY INC.

Dates

Publication Date

20260507

Application Date

20250918

Priority Date

20241107

Claims (20)

1. 1 . A display panel, comprising: a substrate; an insulating layer disposed on the substrate, wherein a plurality of first electrodes are spaced apart from each other on a side of the insulating layer away from the substrate; and a pixel defining layer disposed on the side of the insulating layer away from the substrate and having a plurality of pixel openings, wherein an orthogonal projection of a pixel opening on the substrate in a thickness direction of the substrate overlaps with a portion of the first electrode and covers an edge of the first electrode, and a gap exists between the edge of the first electrode and the insulating layer.
2. 2 . The display panel according to claim 1 , wherein the pixel defining layer continuously covers the insulating layer, a side surface of the edge of the first electrode, and a portion of a surface of the first electrode away from the substrate, and the gap is enclosed by the first electrode, the insulating layer, and the pixel defining layer.
3. 3 . The display panel according to claim 2 , wherein the pixel defining layer comprises: a first sub-pixel defining layer and a second sub-pixel defining layer, wherein the second sub-pixel defining layer is disposed on the first sub-pixel defining layer, and a thickness of the first sub-pixel defining layer is greater than or equal to a thickness of the second sub-pixel defining layer.
4. 4 . The display panel according to claim 3 , wherein a ratio of the thickness of the first sub-pixel defining layer to the thickness of the second sub-pixel defining layer is between 4:1 and 1.5:1.
5. 5 . The display panel according to claim 3 , wherein a material of the first sub-pixel defining layer is different from a material of the second sub-pixel defining layer.
6. 6 . The display panel according to claim 5 , wherein an oxygen content in the second sub-pixel defining layer is greater than an oxygen content in the first sub-pixel defining layer.
7. 7 . The display panel according to claim 1 , wherein ITO films cover both upper and lower opposite sides of the first electrode.
8. 8 . The display panel according to claim 7 , wherein the ITO film located at the edge of the first electrode and closed to the insulating layer has a gap, the pixel defining layer covers the insulating layer and continuously extends from the side surface of the first electrode to cover a portion of the surface of the first electrode away from the substrate, and the gap is enclosed by the first electrode, the ITO film, the insulating layer, and the pixel defining layer.
9. 9 . The display panel according to claim 1 , further comprising: an isolation structure disposed on the pixel defining layer, wherein the isolation structure defines a plurality of isolation openings corresponding to the plurality of pixel openings, and the isolation structure comprises a support portion and a crown portion, wherein the support portion is disposed on the pixel defining layer, and the crown portion is disposed on a side of the support portion away from the pixel defining layer and extends outward relative to the support portion.
10. 10 . The display panel according to claim 9 , wherein the support portion comprises a first sub-support portion and a second sub-support portion, wherein the first sub-support portion is disposed on a side of the pixel defining layer away from the substrate, and the second sub-support portion is disposed on the first sub-support portion.
11. 11 . The display panel according to claim 10 , further comprising: a display functional layer comprising a plurality of light-emitting devices, wherein the light-emitting devices are correspondingly disposed in the isolation openings, and each light-emitting device comprises the first electrode, a light-emitting functional layer and a second electrode, wherein the light-emitting functional layer is at least partially located in the pixel opening, wherein the second electrode is disposed on the light-emitting functional layer and contacts the support portion.
12. 12 . The display panel according to claim 11 , further comprising: an encapsulation layer covering the second electrode and contacting the support portion.
13. 13 . The display panel according to claim 1 , wherein a driving layer is disposed on the substrate, the driving layer covers the display area and the non-display area, the portion of the driving layer corresponding to the display area comprises a plurality of pixel driving circuits, and the display functional layer is disposed on the driving circuit layer.
14. 14 . A method for preparing a display panel, comprising: forming an insulating layer on a substrate; forming a first conductive layer on the insulating layer and patterning the first conductive layer to form a first electrode; and forming a pixel defining layer having a plurality of pixel openings through a patterning process on the insulating layer where the first electrode is formed, wherein the pixel defining layer continuously covers the insulating layer, a side surface of the first electrode, and a portion of a surface of the first electrode away from the insulating layer.
15. 15 . The method for preparing the display panel according to claim 14 , wherein the step of forming the pixel defining layer on the insulating layer where the first electrode is formed comprises: adjusting a deposition rate of the pixel defining layer to make the pixel defining layer continuously cover the side surface of the first electrode.
16. 16 . The method for preparing the display panel according to claim 15 , wherein the step of adjusting the deposition rate comprises: reducing the deposition rate of the pixel defining layer as deposition time increases.
17. 17 . The method for preparing the display panel according to claim 16 , wherein the pixel defining layer comprises a first sub-pixel defining layer and a second sub-pixel defining layer, and before performing the patterning process on the pixel defining layer, the method comprises: depositing the first sub-pixel defining layer first, then depositing the second sub-pixel defining layer on the first sub-pixel defining layer, wherein a material of the second sub-pixel defining layer is different from a material of the first sub-pixel defining layer; and performing a patterning process on the second sub-pixel defining layer, wherein the first sub-pixel defining layer and the second sub-pixel defining layer jointly define the pixel opening.
18. 18 . The method for preparing the display panel according to claim 17 , wherein a deposition rate of the first sub-pixel defining layer is greater than a deposition rate of the second sub-pixel defining layer, and a thickness of the first sub-pixel defining layer is greater than or equal to a thickness of the second sub-pixel defining layer.
19. 19 . The method for preparing the display panel according to claim 14 , wherein before performing the patterning process on the pixel defining layer, the method further comprises: depositing an isolation functional layer on the pixel defining layer, and performing a patterning process on the isolation functional layer to form an isolation structure, wherein the isolation structure defines a plurality of isolation openings.
20. 20 . A display device, comprising: a display panel, comprising: a substrate; an insulating layer disposed on the substrate, wherein a plurality of first electrodes are spaced apart from each other on a side of the insulating layer away from the substrate; and a pixel defining layer disposed on the side of the insulating layer away from the substrate and having a plurality of pixel openings, wherein an orthogonal projection of a pixel opening on the substrate in a thickness direction of the substrate overlaps with a portion of the first electrode and covers an edge of the first electrode, and a gap exists between the edge of the first electrode and the insulating layer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application claims priority to Chinese Patent Application No. 202411590874.7, filed on Nov. 7, 2024 and entitled “DISPLAY PANEL, PREPARATION METHOD THEREFOR, AND DISPLAY DEVICE”, which is incorporated herein by reference in its entirety. FIELD The present application relates to the field of display technology, in particular to a display panel, preparation method thereof, and display device. BACKGROUND The development of semiconductor technology plays a crucial role in the advancement of electronic industry. Organic Light-Emitting Diode (OLED) has attracted significant attention and has been widely applied in electronic display products due to its advantages such as simple preparation process, low cost, low power consumption, high brightness, wide viewing angle, high contrast ratio, and capability for flexible display. However, the process performance of current OLED display products needs improvement. SUMMARY The present application provides a display panel, preparation method thereof, and display device, aiming to improve the process performance of the display panel. A display panel includes a substrate; an insulating layer disposed on the substrate, and a plurality of first electrodes are spaced apart from each other on a side of the insulating layer away from the substrate; a pixel defining layer disposed on the side of the insulating layer away from the substrate and having a plurality of pixel openings, and an orthogonal projection of a pixel opening on the substrate in a thickness direction of the substrate overlaps with a portion of the first electrode and covers an edge of the first electrode, and a gap exists between the edge of the first electrode and the insulating layer. An embodiment of the present application provides a method for preparing a display panel, including: forming an insulating layer on a substrate;forming a first conductive layer on the insulating layer and patterning the first conductive layer to form a first electrode;forming a pixel defining layer having a plurality of pixel openings through a patterning process on the insulating layer where the first electrode is formed, and the pixel defining layer continuously covers the insulating layer, a side surface of the first electrode, and a portion of a surface of the first electrode away from the insulating layer. An embodiment of the present application provides a display device, including the above-mentioned display panel, or including the display panel prepared by the above-mentioned preparation method. Compared with the prior art, by changing the deposition rate of the pixel defining layer during preparation to achieve rapid sealing at the undercut of the first electrode, to retain a portion of gap under the first electrode (where no material is filled), the present application improves the boundary condition and crack issues at the edge of the first electrode. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present application or the prior art, a brief description of the accompanying drawings required for describing the embodiments or the prior art is provided below. The accompanying drawings in the following description show merely some embodiments of the present application, and other drawings may be derived from these accompanying drawings. FIG. 1 is a structural diagram of a display panel according to an embodiment of the present application; FIG. 2 is a sectional view of a light-emitting device with the light-emitting functional layer and encapsulation layer removed at position a in FIG. 1; FIG. 3 is an enlarged view of position b in FIG. 2; FIG. 4 is a sectional view of a modified isolation structure of the embodiment in FIG. 2; FIG. 5 is a sectional view of a modified light-emitting device of the embodiment in FIG. 2; FIG. 6 is an enlarged view of position c in FIG. 5; FIG. 7 is a sectional view of a modified isolation structure of the embodiment in FIG. 6; FIG. 8 is a sectional view of a light-emitting device with the light-emitting functional layer removed at position a in FIG. 1; FIG. 9 is a flow diagram of a method for preparing a display panel according to an embodiment of the present application; FIG. 10 is a sectional view of a light-emitting device with the light-emitting functional layer removed according to another embodiment of the present application; FIG. 11 is an enlarged view of position d in FIG. 10. DETAILED DESCRIPTION OF THE EMBODIMENTS To make the object, embodiments, and advantages of the present application more clear, the present application will be described in further detail below with reference to specific embodiments and accompanying drawings. It should be noted that unless otherwise defined, the terms or scientific terms used in the embodiments of the present application should be understood in their ordinary meaning by persons in the field to which the present application belongs. The words “firs