CN115019657A

CN115019657A - Display panel, preparation method thereof and display device

Info

Publication number: CN115019657A
Application number: CN202210723604.3A
Authority: CN
Inventors: 卓毅
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-09-06

Abstract

The application discloses display panel and preparation method, display device thereof, display panel includes display area and non-display area be equipped with the district of buckling in the non-display area, display panel includes: a flexible substrate; the insulating layer is arranged on the flexible substrate; the groove is arranged in the bending area and is recessed into the insulating layer; the organic layer is filled in the groove, and one side of the organic layer, which is far away from the flexible substrate, is a patterned surface; and; and the metal layer is arranged on one side of the organic layer and one side of the insulating layer, which are far away from the flexible substrate. The technical effect of this application lies in, slows down the stress of buckling, improves the performance of buckling.

Description

Display panel, preparation method thereof and display device

Technical Field

The application relates to the field of display, in particular to a display panel, a preparation method thereof and a display device.

Background

In order to increase the screen occupation ratio of electronic products, the narrow frame design of the display panel is particularly important, and the most effective method at present is a bending technology, that is, a part of Fan-out wiring area of the screen, the driver IC and the Flexible Printed Circuit (FPC) are bent together to the back of the screen for bonding.

The commonly used technique of the back plate in the bending technique is to etch a Deep Hole (DH) in the inorganic layer of the bending area (bending area), fill the deep hole DH with an organic material, then deposit a metal over the organic material as a trace, and finally cover the trace with the organic material. However, this method still has the risk of breaking the trace during the bending process, so that improvement is needed.

Disclosure of Invention

An object of the application is to provide a display panel, a manufacturing method thereof and a display device, which can solve the technical problem that a metal wire in a bending area of an existing flexible display device is easy to break.

In order to achieve the above object, the present application provides a display panel, including a display area and a non-display area, a bending area is provided in the non-display area, the display panel includes: a flexible substrate; the insulating layer is arranged on the flexible substrate; the groove is arranged in the bending area and is recessed into the insulating layer; the organic layer is filled in the groove, and one side of the organic layer, which is far away from the flexible substrate, is a patterned surface; and; and the metal layer is arranged on one side of the organic layer and one side of the insulating layer, which are far away from the flexible substrate.

Further, the metal layer extends along a shape of a patterned surface of the organic layer.

Further, a display unit is arranged in the display area, and the metal layer extends and is connected to the display unit.

Further, the metal layer is laid on the whole surface, and the metal layer is bent to the back surface of the display panel in the bending area.

Furthermore, the patterned surface of the organic layer is a concave groove, and the depth of the concave groove is smaller than that of the groove; the cross-sectional pattern of the groove is one of rectangle, trapezoid and inverted trapezoid.

In order to achieve the above object, the present application further provides a method for manufacturing a display panel, including the steps of: providing a flexible substrate; preparing an insulating layer on the flexible substrate; preparing a groove at a part of the insulating layer; preparing an organic layer having a patterned surface within the trench; and preparing a metal layer on the organic layer and the insulating layer.

Further, the step of preparing an organic layer having a patterned surface within the trench includes: depositing a layer of organic material in the trench; and etching with a half mask to form the organic layer on the patterned surface.

Further, in the step of preparing the metal layer on the organic layer and the insulating layer, the metal layer is prepared in the patterned surface of the organic layer and the upper surface of the insulating layer.

Further, the preparation method of the display panel further comprises the following steps: and bending the region provided with the groove to form a bending region, wherein the metal layer on the upper surface of the insulating layer is bent to the back.

To achieve the above object, the present application further provides a display device, which includes the display panel as described above, a back plate, and a cover plate.

The technical effect of this application lies in, sets up the slot in the district of buckling, and the intussuseption has the organic insulating layer on patterning surface in the slot, and the metal is walked and is formed three-dimensional extension in patterning organic layer, increases the effective length in the district of buckling, slows down the stress that receives when buckling, and is more resistant buckling, reduces the fracture risk.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of an insulating layer provided in an embodiment of the present application after the insulating layer is prepared;

FIG. 3 is a schematic diagram of a structure after a trench is formed according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram after an organic layer is prepared as provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a metal layer after being prepared according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present application.

Description of reference numerals:

110. a flexible substrate; 120. a display unit; 130. an insulating layer; 140. an organic layer; 150. a metal layer; 131. a trench;

DA. A display area; NDA, non-display area; BA. A bending zone.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the present application, are given by way of illustration and explanation only, and are not intended to limit the present application. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.

As shown in fig. 1 to 6, an embodiment of the present application provides a display panel, a manufacturing method thereof, and a display device. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.

As shown in fig. 1, the present embodiment provides a method for manufacturing a display panel, including steps S1 to S6.

S1 provides a flexible substrate 110, where the flexible substrate 110 is made of Polyimide (PI) material to support the flexible substrate, and because the flexible substrate is a flexible substrate, the flexible substrate has good bending performance and is suitable for a flexible display panel. The flexible substrate 110 is divided into a display area DA and a non-display area NDA, and a bending area BA is provided in the non-display area NDA.

S2 preparing an insulating layer 130 on the flexible substrate 110 (see fig. 2), and specifically, depositing an inorganic insulating material on the flexible substrate 110, the inorganic insulating material being silicon oxide (SiO) ₂ ) Silicon nitride (SiNx), etc., the insulating layer 130 is a multi-layered structure includingThe buffer layer, the gate insulating layer, the dielectric layer and other insulating film layers have good insulating performance.

S3, preparing a trench 131 at a portion of the insulating layer 130 (see fig. 3), specifically, etching the trench 131 at the bending area BA by using a photomask, and since the insulating layer 130 is prone to fracture during bending, the trench is disposed in the bending area BA for relieving the stress applied to the display panel during bending.

S4, preparing an organic layer 140 having a patterned surface in the trench 131 (see fig. 4), specifically, depositing a layer of organic material in the trench 131, wherein the organic material is an organic insulating material and has good insulating properties, and short circuits between the conductive layers are prevented. Etching and ashing treatment are carried out by adopting a half photomask (half tone) to form the organic layer 140 on the patterned surface, the patterned surface of the organic layer 140 is a concave groove to form a wavy concave-convex pattern, the depth of the groove is smaller than that of the groove 131, and the cross-sectional pattern of the groove is one of a rectangle, a trapezoid and an inverted trapezoid.

S5, forming a metal layer 150 on the organic layer 140 and the insulating layer 130 (see fig. 5), specifically, forming a metal layer 150 in the patterned surface of the organic layer 140 and on the upper surface of the insulating layer 130, wherein the metal layer 150 is laid over the entire surface, extends in a three-dimensional space, is more resistant to bending, and does not require additional processes. The metal layer 150 extends in the display area DA and is connected to the display unit 120, and the metal layer 150 also extends to a peripheral metal pad, for example, a circuit structure such as a flexible circuit board.

S6 bends the region where the trench 131 is located to form a bending region BA, and the metal layer 150 on the upper surface of the insulating layer 130 is bent to the back surface (see fig. 6).

The manufacturing method of the display panel has the technical effects that the groove is formed in the bending area, the organic insulating layer with the patterned surface is filled in the groove, the metal wiring forms three-dimensional extension in the patterned organic layer, the effective length in the bending area is increased, stress borne by the metal wiring during bending is relieved, the bending is more resistant, and the fracture risk is reduced.

In this embodiment, the following description is focused on the display panel, and the rest of the structures are not repeated.

As shown in fig. 2 to 6, the display panel includes a display area DA and a non-display area NDA, and a bending area BA is disposed in the non-display area NDA.

The display panel includes: a flexible substrate 110, a display unit 120, an insulating layer 130, an organic layer 140, and a metal layer 150.

The flexible substrate 110 is made of a Polyimide (PI) material, and plays a role in supporting, and meanwhile, the flexible substrate has good bending performance and is suitable for a flexible display panel.

The insulating layer 130 is disposed on the flexible substrate 110, and the insulating layer 130 is an inorganic insulating layer made of silicon oxide (SiO) ₂ ) Silicon nitride (SiNx), and the like, the insulating layer 130 has a multi-layer structure including a buffer layer, a gate insulating layer, a dielectric layer, and other insulating film layers, and has good insulating properties.

The groove 131 is disposed in the bending area BA and recessed in the insulating layer 130, and the groove 131 is used for relieving stress on the display panel during bending.

The organic layer 140 is filled in the trench 131, and a side of the organic layer 140 away from the flexible substrate 110 is a patterned surface. The patterned surface of the organic layer 140 is a concave groove, the depth of the concave groove is less than the depth of the groove 131, and the cross-sectional pattern of the concave groove is one of a rectangle, a trapezoid and an inverted trapezoid. The grooves are provided to provide a longer extension path for the metal layer 150, so as to relieve stress during bending.

The metal layer 150 is disposed on a side of the organic layer 140 and a side of the insulating layer 130 away from the flexible substrate 110, in this embodiment, the metal layer 150 extends in the patterned surface of the organic layer 140 and extends to the upper surface of the insulating layer 130, and is laid for the whole surface, and in the bending area BA, the metal layer 150 is partially bent to the back surface of the display panel. Due to the presence of the patterned organic layer, the metal layer 150 has a longer effective length in the bending area BA, and thus the stress applied during bending is greatly reduced.

The display unit 120 is located in the display area DA, and is disposed on the upper surface of the insulating layer 130, and the metal layer 150 extends and is connected to the display unit 120.

The technical effects of the display panel and the display device are that the metal layer has longer effective length in the bending area, stress applied during bending is reduced, the risk of fracture is avoided, and the bending performance of the display device is improved.

The display panel, the manufacturing method thereof, and the display device provided in the embodiments of the present application are described in detail above, and specific examples are applied in the present application to explain the principles and embodiments of the present application, and the description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A display panel comprises a display area and a non-display area, wherein a bending area is arranged in the non-display area, and the display panel is characterized by comprising:

a flexible substrate;

the insulating layer is arranged on the flexible substrate;

the groove is arranged in the bending area and is recessed into the insulating layer;

the organic layer is filled in the groove, and one side of the organic layer, which is far away from the flexible substrate, is a patterned surface; and;

and the metal layer is arranged on one side of the organic layer and one side of the insulating layer, which are far away from the flexible substrate.

2. The display panel of claim 1,

the metal layer extends along a shape of a patterned surface of the organic layer.

3. The display panel of claim 1,

a display unit is disposed within the display area, and the metal layer extends and is connected to the display unit.

4. The display panel of claim 1,

the metal layer is laid on the whole surface, and the metal layer is bent to the back surface of the display panel in the bending area.

5. The display panel of claim 1,

the patterned surface of the organic layer is a concave groove, and the depth of the concave groove is smaller than that of the groove; the cross-sectional pattern of the groove is one of rectangle, trapezoid and inverted trapezoid.

6. A preparation method of a display panel is characterized by comprising the following steps:

providing a flexible substrate;

preparing an insulating layer on the flexible substrate;

preparing a groove at a part of the insulating layer;

preparing an organic layer having a patterned surface within the trench; and

and preparing a metal layer on the organic layer and the insulating layer.

7. The method of manufacturing a display panel according to claim 6, wherein the step of preparing the organic layer having the patterned surface in the groove includes:

depositing a layer of organic material in the trench; and

and etching by using a half mask to form an organic layer on the patterned surface.

8. The method for manufacturing a display panel according to claim 6, wherein in the step of manufacturing the metal layer on the organic layer and the insulating layer,

a metal layer is prepared within the patterned surface of the organic layer and on the upper surface of the insulating layer.

9. The method for manufacturing a display panel according to claim 6, further comprising:

and bending the region provided with the groove to form a bending region, wherein the metal layer on the upper surface of the insulating layer is bent to the back.

10. A display device comprising the display panel according to any one of claims 1 to 5, further comprising a back plate and a cover plate.