阅读说明：本技术 显示面板及其制备方法、显示装置 (Display panel, preparation method thereof and display device ) 是由 陈诚 于 2019-11-26 设计创作，主要内容包括：本发明提供一种显示面板及其制备方法、显示装置，所述显示面板包括：在水平方向上被划分为显示区、换线区及弯折区；所述显示面板从下至上依次包括基板、阻隔层、缓冲层、有源层、第一栅极绝缘层、第一金属层及第二栅极绝缘层，还包括：第一通孔、第二金属层、第一有机层、第二金属层、层间绝缘层、第三金属层；其中，位于所述显示区的部分第三金属层穿过所述层间绝缘层，电连接至第二金属层。本发明的技术效果在于，提高显示面板的弯折性能，降低电路压降，提高显示面板的亮度均一性。(The invention provides a display panel, a preparation method thereof and a display device, wherein the display panel comprises: divided into a display area, a line changing area and a bending area in the horizontal direction; display panel includes base plate, barrier layer, buffer layer, active layer, first gate insulation layer, first metal level and second gate insulation layer from supreme down in proper order, still includes: the first through hole, the second metal layer, the first organic layer, the second metal layer, the interlayer insulating layer and the third metal layer; and part of the third metal layer in the display area penetrates through the interlayer insulating layer and is electrically connected to the second metal layer. The invention has the technical effects of improving the bending performance of the display panel, reducing the circuit voltage drop and improving the brightness uniformity of the display panel.)

1. A display panel is characterized in that the display panel is divided into a display area, a line changing area and a bending area in the horizontal direction;

display panel includes base plate, barrier layer, buffer layer, active layer, first gate insulation layer, first metal level and second gate insulation layer from supreme down in proper order, still includes:

the first through hole penetrates through the blocking layer, the buffer layer, the first grid electrode insulating layer and the second grid electrode insulating layer in the bending area in sequence and is used as a source drain electrode lap opening;

the second metal layer is partially arranged at the bottom and the inner side wall of the first through hole and extends to the surface of the second grid insulation layer;

the first organic layer is arranged on the surface of one side, away from the first grid insulation layer, of the second grid insulation layer and in the first through hole; the second metal layer is partially arranged on the surface of one side, away from the second gate insulation layer, of the first organic layer;

the interlayer insulating layer is arranged on the surface of one side, away from the second grid electrode insulating layer, of the first organic layer; and

the third metal layer is arranged on the surface of one side, away from the first organic layer, of the interlayer insulating layer;

and part of the third metal layer positioned in the display area penetrates through the interlayer insulating layer and is electrically connected to the second metal layer.

2. The display panel of claim 1,

the first metal layer comprises aluminum or aluminum alloy; and/or the presence of a gas in the gas,

the second metal layer comprises aluminum or aluminum alloy.

3. The display panel of claim 1, further comprising

The second through hole penetrates through the first organic layer in the display area, and is partially communicated with the first through hole to serve as a source-drain lap opening; the other part is arranged opposite to the first metal layer driving circuit capacitor lower electrode pattern to form a capacitor opening;

the second metal layer is partially arranged in the second through hole and is arranged on the surface of one side, far away from the first gate insulation layer, of the second gate insulation layer.

4. The display panel of claim 1, further comprising

A third via hole penetrating the interlayer insulating layer, the first organic layer, the second gate insulating layer, and the first gate insulating layer; and/or the presence of a gas in the gas,

a third via hole penetrating the interlayer insulating layer and the first organic layer; and/or the presence of a gas in the gas,

and a third through hole penetrating the interlayer insulating layer.

5. The display panel of claim 4,

the third metal layer is partially arranged in the third through hole.

6. The display panel of claim 4,

the third metal layer is partially lapped to the mesh-shaped routing of the second metal layer through the third through hole to form a parallel circuit.

7. A display device comprising the display panel according to any one of claims 1 to 6.

8. A preparation method of a display panel is characterized by sequentially comprising a substrate providing step, a barrier layer preparation step, a buffer layer preparation step, an active layer preparation step, a first grid insulation layer preparation step, a first metal layer preparation step and a second grid insulation layer preparation step, and further comprising the following steps of:

a first through hole forming step of forming a first through hole by penetrating the barrier layer, the buffer layer, the first gate insulating layer, and the second gate insulating layer;

a first organic layer preparation step of preparing a first organic layer on the upper surface of the second gate insulating layer and in the first through hole;

a second metal layer preparation step of exposing the first organic layer and forming a second metal layer on the bottom and inner side wall of the first through hole and the upper surface of the second gate insulation layer; forming a second metal layer on the upper surface of the first organic layer;

preparing an interlayer insulating layer on the upper surfaces of the first organic layer and the second metal layer; and

and a third metal layer preparation step of preparing a third metal layer on the upper surface of the interlayer insulating layer.

9. The method for manufacturing a display panel according to claim 8,

after the first organic layer preparation step, the method further comprises

A second through hole setting step of setting a second through hole at the first organic layer above the first metal layer;

in the step of preparing the second metal layer,

and part of the second metal layer is arranged in the second through hole and is opposite to the first metal layer.

10. The method for manufacturing a display panel according to claim 8,

after the interlayer insulating layer preparing step, the method further comprises:

a fourth through hole is arranged, wherein a fourth through hole is arranged on the interlayer insulating layer, penetrates through the interlayer insulating layer and is arranged opposite to the first through hole; and

a second organic layer preparation step of preparing a second organic layer in the fourth through hole;

in the step of preparing the third metal layer,

the third metal layer is partially disposed on the upper surface of the second organic layer.

Technical Field

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

Background

The OLED (Organic Light-Emitting Diode) has the advantages of Light weight, self-luminescence, wide viewing angle, low driving voltage, high luminous efficiency, low power consumption, high response speed and the like, so that the application range is more and more extensive, and particularly, the flexible OLED display device has the characteristic of being bendable and easy to carry, and becomes a main field of research and development in the technical field of display.

At present, the requirement of high-end mobile phones on brightness uniformity is high, and how to improve the brightness uniformity of screens is a key direction for development of various manufacturers.

Disclosure of Invention

The invention aims to solve the technical problem that the brightness uniformity of the conventional display panel cannot meet high requirements.

In order to achieve the above object, the present invention provides a display panel, which is divided into a display area, a line changing area and a bending area in a horizontal direction; display panel includes base plate, barrier layer, buffer layer, active layer, first gate insulation layer, first metal level and second gate insulation layer from supreme down in proper order, still includes: the first through hole penetrates through the blocking layer, the buffer layer, the first grid electrode insulating layer and the second grid electrode insulating layer in the bending area in sequence and is used as a source drain electrode lap opening; the second metal layer is partially arranged at the bottom and the inner side wall of the first through hole and extends to the surface of the second grid insulation layer; the first organic layer is arranged on the surface of one side, away from the first grid insulation layer, of the second grid insulation layer and in the first through hole; the second metal layer is partially arranged on the surface of one side, away from the second gate insulation layer, of the first organic layer; the interlayer insulating layer is arranged on the surface of one side, away from the second grid electrode insulating layer, of the first organic layer; the third metal layer is arranged on the surface of one side, away from the first organic layer, of the interlayer insulating layer; and part of the third metal layer positioned in the display area penetrates through the interlayer insulating layer and is electrically connected to the second metal layer.

Further, the first metal layer material comprises aluminum or aluminum alloy; and/or the material of the second metal layer comprises aluminum or aluminum alloy.

Furthermore, the display panel also comprises a second through hole which penetrates through the first organic layer in the display area, the second through hole is partially communicated with the first through hole, and the other part of the second through hole is arranged opposite to the first metal layer driving circuit capacitor lower electrode pattern so as to form a capacitor opening; the second metal layer is partially arranged in the second through hole and is arranged on the surface of one side, far away from the first gate insulation layer, of the second gate insulation layer.

Furthermore, the display panel further comprises a third through hole penetrating through the interlayer insulating layer, the first organic layer, the second gate insulating layer and the first gate insulating layer; and/or a third via hole penetrating the interlayer insulating layer and the first organic layer; and/or a third via hole penetrating the interlayer insulating layer.

Further, the third metal layer is partially disposed in the third through hole.

Further, the third metal layer is partially lapped to the mesh-shaped routing of the second metal layer through the third through hole to form a parallel circuit.

In order to achieve the above object, the present invention further provides a display device including the display device described above.

In order to achieve the above object, the present invention further provides a method for manufacturing a display panel, which sequentially includes a substrate providing step, a barrier layer manufacturing step, a buffer layer manufacturing step, an active layer manufacturing step, a first gate insulating layer manufacturing step, a first metal layer manufacturing step, and a second gate insulating layer manufacturing step, and further includes: a first through hole forming step of forming a first through hole by penetrating the barrier layer, the buffer layer, the first gate insulating layer, and the second gate insulating layer; a first organic layer preparation step of preparing a first organic layer on the upper surface of the second gate insulating layer and in the first through hole; a second metal layer preparation step of exposing the first organic layer and forming a second metal layer on the bottom and inner side wall of the first through hole and the upper surface of the second gate insulation layer; forming a second metal layer on the upper surface of the first organic layer; preparing an interlayer insulating layer on the upper surfaces of the first organic layer and the second metal layer; and a third metal layer preparation step of preparing a third metal layer on the upper surface of the interlayer insulating layer.

Further, after the first organic layer preparing step, the method for preparing the display panel further comprises a second through hole arranging step of arranging a second through hole at the first organic layer above the first metal layer; in the second metal layer preparation step, part of the second metal layer is arranged in the second through hole and is opposite to the first metal layer.

Further, after the interlayer insulating layer preparing step, the method of preparing the display panel further includes: a fourth through hole is arranged, wherein a fourth through hole is arranged on the interlayer insulating layer, penetrates through the interlayer insulating layer and is arranged opposite to the first through hole; a second organic layer preparation step of preparing a second organic layer in the fourth through hole; in the third metal layer preparing step, the third metal layer is partially provided on the upper surface of the second organic layer.

The metal layer is made of aluminum or aluminum alloy, so that the conductivity of the metal wire is improved, and the bending characteristic of the metal wire is improved. The data signal line of the bending area is directly arranged on the upper surface of the substrate, so that the data signal line is closer to a neutral plane, and the risk of breakage of the data signal line during bending is reduced. The grid-shaped metal layer structure and the structure that the source drain and the grid layer are overlapped are adopted to form a double-layer power supply signal, so that the resistance of metal wiring can be reduced, the voltage drop of the display panel is reduced, and the brightness uniformity of the display panel is improved.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a display panel according to an embodiment of the present invention;

FIG. 2 is a top view of a display panel according to an embodiment of the present invention;

fig. 3 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention.

Some of the components are identified as follows:

100. a display area; 200. a line changing area; 300. a bending zone;

101. a substrate; 102. a barrier layer; 103. a buffer layer; 104. an active layer; 105. a first gate insulating layer; 106. a first metal layer; 107. a second gate insulating layer; 108. a second metal layer; 109. a first organic layer; 110. an interlayer insulating layer; 111. a third metal layer; 112. a second organic layer; 113. a planarization layer; 114. an anode layer; 115. a pixel defining layer; 116. a spacer; 117. a third via.

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. It is to be understood that the embodiments described are only a few embodiments of the present application and not all 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.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Specifically, the present embodiment provides a display device, which includes a display panel as shown in fig. 1, and the display panel is divided into a display area 100, a line changing area 200 and a bending area 300 in the horizontal direction. In the vertical direction, the substrate 101, the barrier layer 102, the buffer layer 103, the active layer 104, the first gate insulating layer 105, the first metal layer 106, the second gate insulating layer 107, the second metal layer 108, the first organic layer 109, the interlayer insulating layer 110, the third metal layer 111, the second organic layer 112, the planarization layer 113, the anode layer 114, the pixel defining layer 115, and the spacer 116 are sequentially included from bottom to top.

The substrate 101 is a flexible substrate and has the function of blocking water and oxygen, and the substrate 101 has good impact resistance and can effectively protect the display panel. The material of the substrate 101 includes one or more of glass, silicon dioxide, polyethylene, polypropylene, polystyrene, polylactic acid, polyethylene terephthalate, polyimide, or polyurethane.

The barrier layer 102 is provided on the upper surface of the substrate 101 and functions to block water and oxygen.

The buffer layer 103 is disposed on the upper surface of the barrier layer 102, the buffer layer 103 plays a role in buffering, the buffer layer 103 is made of silicon dioxide SiO2 or silicon nitride SiNx, and may be a single SiO2 film layer or a multilayer stack of silicon dioxide SiO2 and silicon nitride SiNx, and the silicon dioxide SiO2 film layer is disposed on the top layer.

The active layer 104 is provided on the upper surface of the buffer layer 103. The material of the active layer 104 is an oxide semiconductor, such as indium gallium zinc oxide IGZO, and the thickness is 300A to 500A (a), and in this embodiment, the thickness of the active layer 104 is preferably 400A (a).

The first gate insulating layer 105 is disposed on the upper surfaces of the active layer 104 and the buffer layer 103, and the first gate insulating layer 105 plays an insulating role to prevent a short circuit problem inside the thin film transistor. The first gate insulating layer 105 may be a single SiO2 film or a multilayer stack of SiO2 and SiNx, and the SiO2 film is disposed on the bottom layer.

The first metal layer 106 is disposed on the upper surface of the first gate insulating layer 105 and is opposite to the active layer 104. The first metal layer 106 is a first gate layer, and the active layer disposed directly below the first metal layer 106 retains semiconductor characteristics. The first metal layer 106 is made of metal, and in this embodiment, preferably, aluminum or aluminum alloy, which improves the electrical conductivity of the first metal layer 106, improves the bending property thereof, and reduces the risk of breaking the first metal layer 106 when being bent.

The second gate insulating layer 107 is disposed on the upper surfaces of the first gate insulating layer 105 and the first metal layer 106, and the second gate insulating layer 107 plays an insulating role to prevent a short circuit problem inside the thin film transistor. The second gate insulating layer 107 may be a single SiO2 film or a multilayer stack of SiO2 and SiNx, with a SiO2 film on the bottom layer.

The first through hole sequentially penetrates through the barrier layer 102, the buffer layer 103, the first gate insulating layer 105 and the second gate insulating layer 107 in the bending region 300 to serve as a source-drain lap opening.

The second metal layer 108 is disposed at the bottom and the inner sidewall of the first via hole, and extends to the upper surface of the second gate insulating layer 107. The second metal layer 108 is made of metal, and in this embodiment, preferably, aluminum or aluminum alloy, which improves the electrical conductivity of the second metal layer 108, improves the bending property thereof, and reduces the risk of breaking the second metal layer 108 when being bent. The second metal layer 108 is used for transmitting data signals.

The second metal layer 108 has a grid-like structure, and since fig. 1 is a cross-sectional view of the display panel, the second metal layer 108 in fig. 1 has a broken structure, but actually has a continuous structure. The second metal layer 108 is disposed at the bottom of the first through hole and is closer to the neutral plane, so that the second metal layer 108 is not easily broken when bending.

The first organic layer 109 is disposed on the upper surface of the second gate insulating layer 107 and in the first through hole, and the first organic layer 109 is an organic insulating layer and has an insulating effect to prevent short circuit of each metal layer.

The second via penetrates the first organic layer 109 of the display region 100, and the second via is partially communicated to the first via to serve as a source-drain lap opening; the other part is arranged opposite to the lower electrode pattern of the driving circuit capacitor of the first metal layer 106 to form a capacitor opening.

The second metal layer 110 is disposed in the second via and on the upper surface of the second gate insulating layer 107, and is opposite to the first metal layer 106. The second metal layer 110 is a second gate layer, and the material of the second metal layer 110 is metal, in this embodiment, preferably, aluminum or aluminum alloy, which improves the conductivity of the second metal layer 110, improves the bending property thereof, and reduces the risk of breaking the second metal layer 110 when being bent.

The interlayer insulating layer 110 is disposed on the upper surfaces of the second metal layer 110 and the first organic layer 109, the interlayer insulating layer 110 is provided with two or more third through holes 117, the third through holes 117 penetrate the interlayer insulating layer 110, and/or the third through holes 117 penetrate the interlayer insulating layer 110 and the first organic layer 109, and/or the third through holes 117 penetrate the interlayer insulating layer 110, the first organic layer 109, the second gate insulating layer 107 and the first gate insulating layer 105, so as to provide a channel for the subsequent third metal layer 111.

The third metal layer 111 is disposed on the upper surface of the interlayer insulating layer 110, disposed in the third via 117, and partially electrically connected to the active layer 104, which is a source/drain layer, forming an electrical connection between the third metal layer 111 and the active layer 104.

The third metal layer 111 of the display area 100 is disposed in the third via 117 and electrically connected to the second metal layer 110, and the second metal layer 110 is a mesh structure, referring to the top view of fig. 2, the metal layer of the mesh structure has a smaller resistance, which can further reduce the voltage drop in the circuit.

The third metal layer 111 of the wire-changing region 200 is disposed in the third via 117, electrically connected to the second metal layer 108, and extends to the second metal layer 108 of the bending region 300 for transmitting data signals. The third metal layer 111 of the wire-changing region 200 is disposed in the third via hole, electrically connected to the second metal layer 110, and directly changes the wire to the second metal layer 108 in the bending region 300. For walking the data signal. Therefore, all data signals in the bending region 300 are transmitted from the second metal layer 108, and the second metal layer 108 is disposed at the bottom of the first via hole and closer to the neutral plane, so that the second metal layer 108 is not easily broken during bending.

The planarization layer 113 is disposed on the upper surfaces of the third metal layer 111 and the interlayer insulating layer 110, and the planarization layer 113 serves to protect the underlying layers. The flat layer 113 is provided with a fourth through hole, the fourth through hole is opposite to the first through hole, and the fourth through hole penetrates through the flat layer 113 to provide a channel for a subsequent film layer.

The second organic layer 112 is arranged in the fourth through hole, and the second organic layer 112 is an organic insulating layer, so that an insulating effect is achieved, and the problem of short circuit of each metal layer is solved.

The anode layer 114 is disposed on the upper surface of the flat layer 113 and opposite to the third metal layer 111, and the anode layer 114 penetrates through the flat layer 113 and is electrically connected to the third metal layer 111, so as to obtain an electrical signal from the tft and provide the electrical signal for the light emitting layer.

The fifth metal layer is a VI trace for routing an initialization voltage signal, and the fifth metal layer may be disposed on the third metal layer 111 or the anode layer 114 for providing an initial voltage signal for the display panel. The fifth metal layer and the third metal layer 111 form a double-layer voltage wiring, so that the resistance can be reduced, the voltage drop can be further reduced, and the brightness uniformity of the display panel can be improved.

The pixel defining layer 115 is disposed on the upper surfaces of the planarization layer 113 and the anode layer 114 for defining the size of the light emitting layer. The pixel defining layer 115 is provided with a pixel defining layer through hole, which penetrates through the pixel defining layer 115 and is disposed opposite to the anode layer 114 to provide a channel for a subsequent light emitting layer.

The spacer 116 is disposed on the upper surface of the pixel defining layer 115 to support the subsequent film layer, so as to prevent collapse and deformation and ensure the yield of the display panel.

The display panel has the technical effects that the metal layer is made of aluminum or aluminum alloy, the conductivity of the metal routing is improved, and the bending characteristic of the metal routing is improved. The data signal line of the bending area is directly arranged on the upper surface of the substrate, so that the data signal line is closer to a neutral plane, and the risk of breakage of the data signal line during bending is reduced. The grid-shaped metal layer structure and the structure that the source drain and the grid layer are overlapped are adopted to form a double-layer power supply signal, so that the resistance of metal wiring can be reduced, the voltage drop of the display panel is reduced, and the brightness uniformity of the display panel is improved.

As shown in fig. 3, the present invention further provides a method for manufacturing a display panel, including steps S1-S.

S1 providing a substrate, wherein the substrate is a flexible substrate and has the function of blocking water and oxygen, and the substrate has better shock resistance and can effectively protect the display panel.

S2 barrier layer preparation, namely preparing a barrier layer on the upper surface of the substrate, wherein the barrier layer plays a role in blocking water and oxygen.

S3 buffer layer preparation step, the buffer layer is prepared on the upper surface of the barrier layer, the buffer layer plays a role in buffering, the buffer layer is made of silicon dioxide SiO2 or silicon nitride SiNx, the buffer layer can be a single-layer SiO2 film layer or a multilayer stack of silicon dioxide SiO2 and silicon nitride SiNx, and the silicon dioxide SiO2 film layer is arranged on the top layer.

And S4, preparing an active layer on the upper surface of the buffer layer.

S5 a first gate insulating layer preparing step, preparing the first gate insulating layer on the upper surfaces of the active layer and the buffer layer, depositing an insulating material by vapor deposition, and curing to form the first gate insulating layer, thereby preventing short circuit between the metal lines.

S6 a first metal layer preparing step of preparing a first metal layer on the upper surface of the first gate insulating layer.

S7 step of preparing a second gate insulating layer, in which the second gate insulating layer is prepared on the upper surfaces of the first gate insulating layer and the first metal layer, and the insulating material is deposited by vapor deposition, and the second gate insulating layer is formed after curing, so as to prevent short circuit between metal lines.

And S8, setting a first through hole through a mask plate, wherein the first through hole penetrates through the barrier layer, the buffer layer, the first gate insulating layer and the second gate insulating layer in sequence.

S9 step of preparing a first organic layer on the top surface of the second gate insulating layer, wherein the first organic layer is made of organic insulating material to prevent short circuit between metal layers.

S10 a second via hole forming step of forming a second via hole in the first organic layer. And etching a second through hole at the first organic layer above the first metal layer to provide a channel for the subsequent metal layer.

S11 a second metal layer preparing step of exposing the first organic layer to form a second metal layer on the bottom and inner sidewall of the first via hole and the upper surface of the second gate insulating layer; and forming a second metal layer on the upper surface of the first organic layer.

S12 a step of preparing an interlayer insulating layer on the upper surfaces of the first organic layer and the second metal layer.

And S13, a fourth through hole is arranged, wherein a fourth through hole is arranged on the interlayer insulating layer, and the fourth through hole penetrates through the interlayer insulating layer and is arranged opposite to the first through hole.

S14 a second organic layer preparation step of preparing a second organic layer in the fourth via.

S15 a third metal layer preparing step of preparing a third metal layer on the interlayer insulating layer and the upper surface of the second organic layer.

And S16 a step of preparing a planarization layer on the interlayer insulating layer and the third metal layer.

And S17, perforating the flat layer by using a mask plate to form a through hole of the flat layer for providing a channel for the subsequent anode layer.

S18 preparing an anode layer, wherein the anode layer is prepared on the upper surface of the flat layer and in the through hole of the flat layer, so that the anode layer is electrically connected to the third metal layer, a fifth metal layer can be arranged on the anode layer, and the fifth metal layer is used for walking an initial voltage signal and providing the initial voltage signal for the whole display panel.

And S19 preparing a pixel definition layer on the upper surfaces of the flat layer and the anode layer, wherein the pixel definition layer can be used for defining the size of the light emitting layer.

And S20, a spacer setting step, namely setting a spacer above the pixel definition layer.

In the metal layer preparation steps (the first metal layer preparation step, the second metal layer preparation step and the third metal layer preparation step), the deposited metal material is preferably aluminum or aluminum alloy, and the aluminum or aluminum alloy improves the conductivity of the metal layer, improves the bending property of the metal layer and reduces the fracture risk of the metal layer when the metal layer is bent.

After the pixel defining layer, the method for manufacturing the display panel may further include: the steps of preparing the light emitting layer, the steps of preparing the pixel electrode layer, etc. are not described herein since they are prior art.

The preparation method of the display panel has the technical effects that the metal layer is made of aluminum or aluminum alloy, the conductivity of the metal wires is improved, and the bending characteristic of the metal wires is improved. The data signal line of the bending area is directly arranged on the upper surface of the substrate, so that the data signal line is closer to a neutral plane, and the risk of breakage of the data signal line during bending is reduced. The grid-shaped metal layer structure and the structure that the source drain and the grid layer are overlapped are adopted to form a double-layer power supply signal, so that the resistance of metal wiring can be reduced, the voltage drop of the display panel is reduced, and the brightness uniformity of the display panel is improved.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

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 description to explain the principle and the implementation of the present application, and the description of the embodiments above is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.