Display panel, manufacturing method thereof, and display device

Abstract

The present application relates to a display panel, a manufacturing method thereof, and a display device. The display panel includes a display substrate and a neutral plane adjusting layer. The display substrate includes a display portion, a bonding portion, and a bending portion located between the display portion and the bonding portion. The display substrate has a first side and a second side disposed opposite to each other. The neutral plane adjusting layer is disposed on the first side and located at the bending portion. The material of the neutral plane adjusting layer includes conductive ink. The bending area of the display panel can be effectively protected.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display panel, a manufacturing method thereof, and a display device. Background Art

[0002] In recent years, with the development of society and the progress of technology, users' demands for display devices have become increasingly diversified. For example, curved-screen mobile phones are a trend in exterior design, and foldable-screen mobile phones are a hot topic of concern in the near future. Among them, OLED (Organic Light-Emitting Diode) display panels are increasingly widely used because of their advantages such as bendability and good flexibility. Summary of the Invention

[0003] Based on this, it is necessary to provide a display panel that can effectively protect the bending area.

[0004] According to one aspect of the present application, a display panel is provided, including a display substrate and a neutral plane adjustment layer; the display substrate includes a display portion, a bonding portion, and a bending portion located between the display portion and the bonding portion; the display substrate has a first side and a second side disposed opposite to each other; the neutral plane adjustment layer is disposed on the first side and located at the bending portion, and the material of the neutral plane adjustment layer includes conductive ink.

[0005] The display panel provided by the embodiments of the present application adjusts the neutral plane of the display panel by providing a neutral plane adjustment layer located at the bending portion on the first side of the display substrate, and the material of the neutral plane adjustment layer includes conductive ink, so that the neutral plane is close to the metal layer, reducing the risk of the metal layer breaking due to stress. At the same time, the conductive ink is used to timely conduct the static electricity near the bending portion, improving the anti-static ability of the display panel and reducing the risk of the metal layer being broken down by high voltage, thereby effectively protecting the bending area.

[0006] In some embodiments, the bending portion includes a first boundary adjacent to the display portion; the neutral plane adjustment layer includes a first region covering the bending portion, and a second region extending from the first boundary in the direction of the display portion by the first region. In this way, the neutral plane adjustment layer not only covers the bending portion, but also covers the transition region between the bending portion and the display portion, thereby improving the protection range of the neutral plane adjustment layer.

[0007] In some embodiments, the display panel further includes a polarizer disposed on the first side and located in the display portion; wherein, the length L1 of the second region in the first direction satisfies the following condition: 0 < L1 ≤ M; wherein, the M is the width of the edge of the polarizer coverage region to the first boundary in the first direction, and the first direction is perpendicular to the first boundary and parallel to the display portion. Based on this, while the neutral plane adjustment layer covers the transition region between the bent portion and the display portion on the first side of the display substrate, there is a certain interval between the neutral plane adjustment layer and the polarizer, or the neutral plane adjustment layer is adjacent to the polarizer without covering the coverage region of the polarizer, so as to avoid the adhesion of the neutral plane adjustment layer to the protective film of the polarizer, thereby avoiding damaging the neutral plane adjustment layer during the subsequent process of removing the protective film of the polarizer.

[0008] In some embodiments, the length L2 of the second region in the second direction satisfies the following condition: E < L2 ≤ N; wherein, the E is the length of the first boundary, and the N is the width of the display portion in the second direction, and the second direction is perpendicular to the first direction. In other words, along the extending direction of the length of the first boundary, the second region completely covers the bent portion but does not exceed the width range of the display portion, thereby while ensuring that the neutral plane adjustment layer can comprehensively protect the bent portion, preventing the neutral plane adjustment layer from overflowing to other regions and affecting the functions of other components.

[0009] In some embodiments, the bent portion includes a second boundary adjacent to the bonding portion; the neutral plane adjustment layer further includes a third region extending from the first region in the direction of the bonding portion from the second boundary. In this way, the neutral plane adjustment layer can further protect the transition region between the bent portion and the bonding portion.

[0010] In some embodiments, the display panel further includes a driving IC disposed on the first side and located in the bonding portion; the length L3 of the third region in the first direction satisfies the following condition: 0 < L3 ≤ Q; wherein, the Q is the distance from the second boundary to the driving IC in the first direction, and the first direction is perpendicular to the second boundary and parallel to the bonding portion. Based on this, the neutral plane adjustment layer at least partially covers the transition region between the bent portion and the bonding portion, and the coverage range of the neutral plane adjustment layer does not overlap with the region where the driving IC is located, thereby while ensuring that the neutral plane adjustment layer can more comprehensively protect the bent portion and its adjacent regions, avoiding the neutral plane adjustment layer from affecting the functions of other components around the bent portion.

[0011] In some embodiments, the thickness H of the neutral plane adjustment layer satisfies the following condition: 40μm ≤ H ≤ 80μm. Based on this, the thickness range of the neutral plane adjustment layer is moderate and the uniformity is good, making the bending performance of the display panel better.

[0012] In some embodiments, the material of the neutral plane adjusting layer includes graphene conductive ink, or, one side surface of the neutral plane adjusting layer facing away from the bent portion has a rough surface to timely conduct the static electricity near the bent portion, thereby improving the antistatic ability of the display panel.

[0013] According to another aspect of the present application, there is also provided a method for manufacturing a display panel, including:

[0014] Providing a display substrate; the display substrate includes a display portion, a bonding portion, and a bent portion located between the display portion and the bonding portion, and the display substrate has a first side and a second side disposed opposite to each other;

[0015] Using a pad printing jig to pad print a multi-layer sub-conductive ink layer on the first side of the bent portion until a neutral plane adjusting layer is formed.

[0016] In the method for manufacturing a display panel provided by the embodiments of the present application, a neutral plane adjusting layer is formed by pad printing conductive ink on the first side of the bent portion, and the neutral plane of the display panel is adjusted by using the neutral plane adjusting layer to make the neutral plane close to the metal layer, reducing the risk of the metal layer breaking due to stress. At the same time, the static electricity near the bent portion is timely conducted by the conductive ink, improving the antistatic ability of the display panel and reducing the risk of the metal layer being broken down by high voltage, thereby effectively protecting the bent area. And, due to the low viscosity of the conductive ink, during the pad printing process, even if the conductive ink is printed on the polarizer, the neutral plane adjusting layer will not be torn off together when the polarizer protective film is torn off.

[0017] According to another aspect of the present application, there is also provided a display device including the display panel as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It shows a schematic structural diagram of the display panel in the unfolded state in an embodiment of the present application;

[0019] Figure 2 It shows Figure 1 a schematic structural diagram of the display panel in the bent state in

[0020] Figure 3 It shows a schematic diagram of a certain state during the manufacturing process of the display panel in an embodiment of the present application.

[0021] Explanation of the reference numerals in the drawings:

[0022] 10. Display panel; 20. Pad printing jig;

[0023] 100. Display substrate; 110. Display portion; 120. Bonding portion; 130. Bent portion; 131. First boundary; 132. Second boundary;

[0024] 200, neutral plane adjustment layer;

[0025] 300, polarizer; 310, optical adhesive;

[0026] 400, driving IC;

[0027] 510, first support portion; 520, second support portion;

[0028] X, first direction. Detailed implementation manners

[0029] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0032] In this application, unless otherwise clearly defined and limited, the terms "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0034] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0035] With the rapid development of OLED display panel technology, it has been widely used due to its bendable and good flexibility characteristics. Compared with the traditional TFT-LCD technology, one of the major advantages of OLED is that it can be made into foldable, rollable or stretchable products.

[0036] For the OLED display panel, the bendability of the display panel is achieved by using a flexible substrate and thin film encapsulation, and the rollability and stretchability are gradually realized. The circuit connection design of the display panel is different from the COG (Chip on Glass) and FOG (Film on Glass) processes of the hard screen, but adopts the Pad Bending technology. Since it can significantly shorten the border width of the display panel, it has gradually replaced the COF Bending technology and become the mainstream Bending technology. The Pad Bending technology requires bending the bending area of the display panel to the back of the display panel, and connecting the display area of the display panel to the driving circuit disposed in the bending area through metal traces.

[0037] Among them, in the related art, during Pad Bending, it is required to perform thinning treatments such as removing the back film in the bending area, which results in Pad Bending becoming increasingly fragile and prone to cracking problems. The conventional method adopted to protect the bending area is: before Pad Bending, apply a protective glue in the bending area to protect the bending area.

[0038] The inventors of the present application found that the protective glue is generally formed by dot coating. The dot-shaped glue formed by dot coating will automatically spread to form a planar glue body. On the one hand, the spread of the dot-shaped glue is prone to problems such as insufficient and uneven spread, which in turn leads to pores and bubbles in the planar glue body formed by the spread. Moreover, the existence of pores and bubbles provides a channel for external substances such as water and oxygen to invade the screen body in the bending area, posing a great potential hazard to the reliability of the screen body.

[0039] On the other hand, for the protective glue, for example, there is a problem of incomplete surface drying after UV curing. In the part closer to the surface of the protective glue, due to contact with oxygen, there is oxygen inhibition polymerization, so that the protective glue in this part cannot be completely cured. In addition, after the protective glue is cured, its modulus will increase with time. In the preparation process in the related art, after the glue coating process, more than a dozen processes such as bonding, laminating, and laser are required before reaching the bending process. The long waiting time in the middle makes the protective glue gradually harden, resulting in the overly hard protective glue being prone to dead folds during bending, affecting the quality of the display panel. Moreover, the increase in the modulus of the protective glue will cause the neutral layer (the layer that does not generate strain during bending) in the bending area to move away from the metal layer (such as metal traces) in the display panel, making the strain of the metal layer during bending easily exceed the safety value and cause fracture.

[0040] The inventors of the present application further found that limited by equipment and process, during the process of the protective glue spreading from dot-shaped glue to a planar glue body, it may spread to contact the side of the protective film of the polarizer, or even overflow onto the protective film of the polarizer. In this case, after the protective glue is cured, it adheres to the protective film of the polarizer, and in the subsequent process of tearing off the protective film of the polarizer, the protective glue may be torn off together, resulting in defects. In addition, the spec value of the glue coating process in the current existing technology is 100±30um, which makes the thickness range of the protective glue after coating too large, and the uniformity of the protective glue is poor. There is a large difference in the thickness of the protective glue at different positions, and the maximum value can even reach 86%, resulting in unevenness in the area and also affecting the bending performance of the display panel.

[0041] At the same time, the protective glue is usually an insulating colloid, which is prone to the accumulation of static electricity in the bending area of the display panel. During the ESD electrostatic test, the instantaneous high voltage may directly break down the metal traces in the bending area of the display panel, causing defects.

[0042] Therefore, it is necessary to provide a display panel capable of effectively protecting the bending area.

[0043] Based on this, the present application provides a display panel. By offset printing conductive ink in the bending area to replace the traditional dispensing solution in the bending area, the problem of poor protection effect caused by poor coating of the protective glue can be avoided, and the antistatic performance of the bending area can be improved.

[0044] The display device in the embodiment of the present application can be applied to a mobile terminal, for example. Examples of the mobile terminal include a tablet personal computer (PC), a smart phone, a personal digital assistant (PDA), a portable multimedia player, a game console, or a wristwatch-type electronic device, etc. However, the embodiments of the present disclosure do not intend to limit the types of mobile terminals to which the display device can be applied. In some exemplary embodiments, the display device can be used not only in large electronic devices such as a television (TV) or an external billboard, but also in medium or small electronic devices such as a PC, a notebook computer, a car navigation device, or a camera.

[0045] Figure 1 FIG. shows a schematic structural diagram of the display panel in the unfolded state in an embodiment of the present application. Figure 2 FIG. shows Figure 1 a schematic structural diagram of the display panel in the bent state in

[0046] Referring to Figure 1 and Figure 2 In an embodiment of the present application, the display panel 10 includes a display substrate 100 and a neutral plane adjustment layer 200; the display substrate 100 includes a display portion 110, a bonding portion 120, and a bending portion 130 located between the display portion 110 and the bonding portion 120; the display substrate 100 has a first side and a second side disposed opposite to each other; the neutral plane adjustment layer 200 is disposed on the first side and located at the bending portion 130, and the material of the neutral plane adjustment layer 200 includes conductive ink.

[0047] In the display panel 10 provided in the embodiment of the present application, by disposing the neutral plane adjustment layer 200 located at the bending portion 130 on the first side of the display substrate 100, and the material of the neutral plane adjustment layer 200 includes conductive ink, the neutral plane of the display panel 10 is adjusted by using the neutral plane adjustment layer 200 to make the neutral plane close to the metal layer, reducing the risk of the metal layer breaking due to stress. At the same time, the static electricity near the bending portion 130 is timely conducted out by using the conductive ink, improving the antistatic ability of the display panel 10 and reducing the risk of the metal layer being broken down by high voltage, thereby effectively protecting the bending area.

[0048] Optionally, a support film is provided on the second side of the display substrate 100 to support the display substrate 100. Further, the support film includes a first support portion 510 and a second support portion 520 that are separated. The first support portion 510 corresponds to the display portion 110, and the second support portion 520 corresponds to the bonding portion 120. In this way, the bending portion 130 has good flexibility and can be bent flexibly. At the same time, the bonding portion 120 and the display portion 110 have relatively strong structural strength.

[0049] In some embodiments, the bending portion 130 includes a first boundary 131 adjacent to the display portion 110; the neutral plane adjustment layer 200 includes a first region covering the bending portion 130 and a second region extending from the first region in the direction of the display portion 110 from the first boundary 131. In this way, the neutral plane adjustment layer 200 not only covers the bending portion 130 but also covers the transition region between the bending portion 130 and the display portion 110, thereby enhancing the protection range of the neutral plane adjustment layer 200.

[0050] Optionally, the display panel 10 further includes a polarizer 300. The polarizer 300 is disposed on the first side and located at the display portion 110; wherein, the length L1 of the second region in the first direction X satisfies the following condition: 0 < L1 ≤ M; where M is the width of the edge of the covering region of the polarizer 300 to the first boundary 131 in the first direction X, and the first direction X is perpendicular to the first boundary 131 and parallel to the display portion 110. Based on this, while the neutral plane adjustment layer 200 covers the transition region between the bending portion 130 and the display portion 110 on the first side of the display substrate 100, there is a certain interval between the neutral plane adjustment layer 200 and the polarizer 300, or the neutral plane adjustment layer 200 is adjacent to the polarizer 300 without covering the covering region of the polarizer 300, so as to avoid the adhesion of the neutral plane adjustment layer 200 to the protective film of the polarizer 300, thereby avoiding damaging the neutral plane adjustment layer 200 in the subsequent process of tearing off the protective film of the polarizer 300.

[0051] Optionally, an optical adhesive 310 is provided on the side of the polarizer 300 facing away from the display substrate 100 for bonding with the cover plate.

[0052] In some embodiments, the length L2 of the second region in the second direction satisfies the following condition: E < L2 ≤ N; where E is the length of the first boundary 131 and N is the width of the display portion 110 in the second direction. The second direction is perpendicular to the first direction X, that is, along the length extension direction of the first boundary 131. The second region completely covers the bending portion 130 but does not exceed the width range of the display portion 110, so as to ensure that the neutral plane adjustment layer 200 can comprehensively protect the bending portion 130 while preventing the neutral plane adjustment layer 200 from overflowing to other regions and affecting the functions of other components.

[0053] In some embodiments, the bent portion 130 includes a second boundary 132 adjacent to the bonding portion 120, and the neutral plane adjusting layer 200 further includes a third region extending from the second boundary 132 in the direction of the bonding portion 120 by the first region, so that the neutral plane adjusting layer 200 can further protect the transition region between the bent portion 130 and the bonding portion 120.

[0054] Optionally, the display panel 10 further includes a driving IC 400 disposed on the first side and located at the bonding portion 120; the length L3 of the third region in the second direction satisfies the following condition: 0 < L3 ≤ Q; where Q is the distance from the second boundary 132 to the driving IC 400 in the second direction, and the second direction is perpendicular to the second boundary 132 and parallel to the bonding portion 120. Based on this, the neutral plane adjusting layer 200 at least partially covers the transition region between the bent portion 130 and the bonding portion 120, and the coverage range of the neutral plane adjusting layer 200 does not overlap with the region where the driving IC 400 is located, so as to ensure that the neutral plane adjusting layer 200 can more comprehensively protect the bent portion 130 and its adjacent regions while avoiding the neutral plane adjusting layer 200 from affecting the functions of other components around the bent portion 130.

[0055] In some embodiments, the thickness H of the neutral plane adjusting layer 200 satisfies the following condition: 40 μm ≤ H ≤ 80 μm. Based on this, the thickness range of the neutral plane adjusting layer 200 is moderate and the uniformity is good, so that the bending performance of the display panel 10 is good.

[0056] In some embodiments, the material of the neutral plane adjusting layer 200 includes graphene conductive ink, or the surface of the neutral plane adjusting layer 200 facing away from the bent portion 130 has a rough surface, so that the neutral plane adjusting layer 200 can not only adjust the neutral plane, but also timely conduct the static electricity near the bent portion 130, thereby improving the antistatic ability of the display panel 10. Graphene conductive ink has the advantages of strong stability, high conductivity, corrosion resistance, low-temperature curing, oxidation resistance, etc., and is suitable for the display panel 10, which can significantly reduce the impedance on the surface of the bent portion 130 of the display panel 10, help to timely conduct the static electricity near the bent portion 130 of the display panel 10, and improve the antistatic ability of the display panel 10.

[0057] Based on the same inventive purpose, the present application also provides a manufacturing method of a display panel.

[0058] Figure 3 FIG. shows a schematic diagram of a certain state in the manufacturing process of a display panel in an embodiment of the present application.

[0059] Refer to Figure 1 and Figure 3, in an embodiment of the present application, the method includes the following steps: providing a display substrate 100; the display substrate 100 includes a display portion 110, a bonding portion 120, and a bending portion 130 located between the display portion 110 and the bonding portion 120, and the display substrate 100 has a first side and a second side disposed opposite to each other; using a pad printing fixture 20 to pad print a multi-layer sub-conductive ink layer on the first side of the bending portion 130 until a neutral plane adjustment layer 200 is formed. Among them, the pad printing fixture uses silica gel or other softer materials.

[0060] The method for manufacturing a display panel provided by the embodiment of the present application forms a neutral plane adjustment layer by pad printing conductive ink on the first side of the bending portion, uses the neutral plane adjustment layer to adjust the neutral plane of the display panel, makes the neutral plane close to the metal layer, reduces the risk of the metal layer breaking due to stress. At the same time, the static electricity in the vicinity of the bending portion is timely conducted out by the conductive ink, improving the antistatic ability of the display panel and reducing the risk of the metal layer being broken down by high voltage, thereby effectively protecting the bending area. And, because the viscosity of the conductive ink is low, during the pad printing process, even if the conductive ink is printed on the polarizer, the situation where the neutral plane adjustment layer is torn off together when the polarizer protective film is torn off will not occur.

[0061] Adopting the method of pad printing the sub-conductive ink layer multiple times to form the neutral plane adjustment layer on the first side of the display substrate can obtain a neutral plane adjustment layer with a higher flatness, thereby optimizing the stress condition of the metal wires in the display panel during bonding, improving the overall elastic modulus of the bending portion, and reducing the risk of metal wire breakage.

[0062] Based on the same inventive purpose, the present application also provides a display device including the display panel in the above embodiment.

[0063] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0064] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A display panel, characterized in that, It includes a display substrate, a neutral plane adjustment layer, and a support film; the display substrate includes a display portion, a bonding portion, and a bending portion located between the display portion and the bonding portion; The display substrate has a first side and a second side that are oppositely arranged; The neutral plane adjustment layer is disposed on the first side and located at the bending portion, and the material of the neutral plane adjustment layer includes conductive ink; The support film is disposed on the second side; Wherein, one surface of the neutral plane adjustment layer facing away from the bending portion has a rough surface, and the thickness H of the neutral plane adjustment layer satisfies the following condition: 40μm ≤ H ≤ 80μm; The neutral plane adjustment layer is in direct contact with the surface of the bending portion away from the support film.

2. The display panel according to claim 1, wherein The bending portion includes a first boundary adjacent to the display portion; The neutral plane adjustment layer includes a first region covering the bending portion, and a second region extending from the first region in the direction of the display portion from the first boundary.

3. The display panel according to claim 2, wherein The display panel further includes a polarizer, and the polarizer is disposed on the first side and located at the display portion; Wherein, the length L1 of the second region in the first direction satisfies the following condition: 0 < L1 ≤ M; Wherein, M is the width of the edge of the polarizer coverage area to the first boundary in the first direction, and the first direction is perpendicular to the first boundary and parallel to the display portion.

4. The display panel according to claim 3, characterized in that, The length L2 of the second region in the second direction satisfies the following condition: E < L2 ≤ N; Wherein, E is the length of the first boundary, and N is the width of the display portion in the second direction, and the second direction is perpendicular to the first direction.

5. The display panel according to claim 2, characterized in that, The bending portion includes a second boundary adjacent to the bonding portion; The neutral plane adjustment layer further includes a third region extending from the first region in the direction of the bonding portion from the second boundary.

6. The display panel according to claim 5, characterized in that, The display panel further includes a driving IC disposed on the first side and located at the bonding portion; The length L3 of the third region in the first direction satisfies the following condition: 0 < L3 ≤ Q; Wherein, Q is the distance from the second boundary to the driving IC in the first direction, and the first direction is perpendicular to the second boundary and parallel to the bonding portion.

7. The display panel according to any one of claims 1-6, characterized in that, The material of the neutral plane adjustment layer includes graphene conductive ink.

8. A method for manufacturing a display panel, characterized in that, It includes: Providing a display substrate and a support film; the display substrate includes a display portion, a bonding portion, and a bending portion located between the display portion and the bonding portion, the display substrate has a first side and a second side that are oppositely arranged, and the support film is disposed on the second side; Using a pad printing jig to pad print at least on the first side of the bending portion to form a multi-layer sub-conductive ink layer until a neutral plane adjustment layer is formed, wherein one surface of the neutral plane adjustment layer facing away from the bending portion has a rough surface, the thickness H of the neutral plane adjustment layer satisfies the following condition: 40μm ≤ H ≤ 80μm, and the neutral plane adjustment layer is in direct contact with the surface of the bending portion.

9. A display device, characterized in that, It includes the display panel according to any one of claims 1-7.

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