Display panel

Abstract

The application discloses a display panel, which comprises a panel body, a support layer and a through hole. The panel body comprises a bending area and a non-bending area, and the non-bending area is located on both sides of the bending area. The support layer is arranged on the surface of the back plate of the panel body and is located in the bending area and the non-bending area of the panel body. The support layer comprises a first heat dissipation layer and a second heat dissipation layer. The second heat dissipation layer is arranged on the first heat dissipation layer and is located between the first heat dissipation layer and the back plate of the panel body. The first heat dissipation layer comprises a first heat-conductive material and a first metal fiber. The first heat-conductive material is distributed around the first metal fiber. The second heat dissipation layer comprises a second heat-conductive material and a carbon fiber. The second heat-conductive material is distributed around the carbon fiber. Part of the support layer located in the bending area is provided with the through hole, and the through hole penetrates the first heat dissipation layer and the second heat dissipation layer. The support layer of the display panel can make the display panel have a larger heat dissipation area.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display panel. Background Technology

[0002] Existing foldable display panels generally use a solution of attaching graphite sheets to the back panel to achieve heat dissipation.

[0003] However, due to the poor elasticity of graphite sheets, they cannot be bent. Therefore, graphite sheets can only be placed in the non-bending area of ​​the display panel, resulting in a smaller heat dissipation area and poor heat dissipation effect of the display panel.

[0004] Therefore, it is necessary to propose a new technical solution to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this application is to provide a display panel whose support layer can provide heat dissipation over a larger area for the back panel.

[0006] To solve the above problems, the technical solution of this application is as follows:

[0007] In a first aspect, this application proposes a display panel, the display panel comprising:

[0008] A panel body, the panel body including a bending area and a non-bending area, the non-bending area being located on both sides of the bending area;

[0009] A support layer is disposed on the surface of the back panel of the panel body. The support layer is located within the bending area and the non-bending area of ​​the panel body. The support layer includes a first heat dissipation layer and a second heat dissipation layer. The second heat dissipation layer is disposed on the first heat dissipation layer and is located between the first heat dissipation layer and the back panel of the panel body. The first heat dissipation layer includes a first thermally conductive material and a first metal fiber. The first thermally conductive material is distributed around the first metal fiber. The second heat dissipation layer includes a second thermally conductive material and carbon fiber. The second thermally conductive material is distributed around the carbon fiber. The portion of the support layer located in the bending area has a through hole that penetrates both the first and second heat dissipation layers.

[0010] Furthermore, the second thermally conductive material includes a second metal fiber, the length of which is less than the length of the first metal fiber, and at least a portion of the second metal fiber is in contact with the first metal fiber.

[0011] Furthermore, the first heat dissipation layer comprises resin, the first thermally conductive material comprises graphite particles mixed in the resin, and both the first metal fiber and the second metal fiber are copper fibers.

[0012] Furthermore, the length of the second metal fiber ranges from 0.1 mm to 1 mm.

[0013] Furthermore, the two ends of the first metal fiber are respectively located in the non-bending areas on both sides of the bending area, and a portion of the first metal fiber is located in the bending area. The two ends of the carbon fiber of at least one second heat dissipation layer are respectively located in the non-bending areas on both sides of the bending area, and a portion of the carbon fiber is located in the bending area.

[0014] Furthermore, the orthographic projection of the carbon fiber in at least one of the second heat dissipation layers onto the panel body is perpendicular to the orthographic projection of the fold line between the bent area and the non-bent area onto the panel body, and the orthographic projection of the first metal fiber onto the panel body is perpendicular to the orthographic projection of the fold line between the bent area and the non-bent area onto the panel body.

[0015] Furthermore, at least two second heat dissipation layers are stacked, and the orthographic projections of the carbon fibers in two adjacent second heat dissipation layers intersect on the back plate.

[0016] Furthermore, the second heat dissipation layer also includes resin, in which the second thermally conductive material and the carbon fiber are mixed, and the second heat dissipation layer is bonded to the back plate through the resin.

[0017] Furthermore, the diameter of the carbon fiber and the diameter of the first metal fiber both range from 5 μm to 15 μm.

[0018] Furthermore, the thickness of the first heat dissipation layer ranges from 10um to 30um, and the thickness of the second heat dissipation layer ranges from 100um to 150um.

[0019] In this application, the first heat dissipation layer includes a first thermally conductive material and a first metal fiber. The first metal fiber can improve the bending performance and thermal conductivity of the first heat dissipation layer, giving it high bending performance and thermal conductivity. The second heat dissipation layer includes a second thermally conductive material and carbon fiber. The carbon fiber can improve the tensile strength and bending performance of the second heat dissipation layer, giving it strong bending performance and thermal conductivity. By combining the first and second heat dissipation layers with high thermal conductivity and bending performance to form a support layer, the support layer can adhere to the back panel located in the bending area and the non-bending area to dissipate heat from the entire back panel of the display panel. By providing through holes in the bending area of ​​the support layer that penetrate the first and second heat dissipation layers, the bending stress and tensile stress experienced by the support layer during bending can be released, preventing the support layer from breaking. The support layer of the display panel in this application can simultaneously cover the back panel of the display panel in both the bending and non-bending areas, giving the display panel a larger heat dissipation area and improving the heat dissipation efficiency and effect of the display panel. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the display panel provided in this application;

[0021] Figure 2 yes Figure 1 The diagram shows a top view of the support layer in the display panel;

[0022] Figure 3 yes Figure 2 The cross-sectional view of the support layer at point A-A' is shown below;

[0023] Figure 4 yes Figure 1 The diagram shown is a schematic of the display panel in its folded state.

[0024] Figure label:

[0025] 100. Main panel; 101. Bending area; 102. Non-bending area; 103. Folding line;

[0026] 110, Support layer; 1101, Through hole; 111, First heat dissipation layer; 1111, First thermally conductive material; 1112, First metal fiber; 112, Second heat dissipation layer; 1121, Second metal fiber; 1122, Carbon fiber;

[0027] 120. Back panel. Detailed Implementation

[0028] The terms used in this specification and claims have the meanings that are commonly understood by one of ordinary skill in the art to which this application pertains. The terms used in this specification and claims are for the purpose of facilitating the description and understanding of this application only, and are not intended to limit this application to the narrow interpretation of the specific terms used in the specification and claims.

[0029] like Figures 1 to 4 As shown, an embodiment of this application provides a display panel, which includes a panel body 100 and a support layer 110. The panel body includes a bending area 101 and a non-bending area 102, wherein the non-bending area 102 is located on both sides of the bending area 101, and the non-bending areas 102 located on both sides of the bending area 101 can be folded in half.

[0030] The support layer 110 is disposed on the surface of the back panel of the panel body 100. The support layer 110 is located in the bending area 101 and the non-bending area 102 of the panel body. The support layer 110 includes a first heat dissipation layer 111 and a second heat dissipation layer 112. The second heat dissipation layer 112 is disposed on the first heat dissipation layer 111 and is located between the first heat dissipation layer and the back panel of the panel body. The first heat dissipation layer 111 includes a first thermally conductive material 1111 and a first metal fiber 1112. The first thermally conductive material 1111 is distributed around the first metal fiber 1112. The second heat dissipation layer 112 includes a second thermally conductive material and a carbon fiber 1122. The second thermally conductive material is distributed around the carbon fiber 1122. The portion of the support layer 110 located in the bending area 101 is provided with a through hole 1101, which penetrates the first heat dissipation layer 111 and the second heat dissipation layer 112.

[0031] In this application, the first heat dissipation layer 111 includes a first thermally conductive material 1111 and a first metal fiber 1112. The first metal fiber 1112 can improve the bending performance and thermal conductivity of the first heat dissipation layer 111, giving the first heat dissipation layer 111 high bending performance and thermal conductivity. The second heat dissipation layer 112 includes a second thermally conductive material and carbon fiber 1122. The carbon fiber 1122 can improve the tensile strength and bending performance of the second heat dissipation layer 112, giving the second heat dissipation layer 112 strong bending performance and thermal conductivity. By combining the first heat dissipation layer 111 and the second heat dissipation layer 112, which have high thermal conductivity and bending performance, a support layer 110 is formed, making the support layer 110... The support layer 110 can fit against the back plate 120 located in the bending area 101 and the non-bending area 102 to dissipate heat from the entire back plate 120 of the display panel. By providing through holes 1101 through the first heat dissipation layer 111 and the second heat dissipation layer 112 in the part of the support layer 110 located in the bending area 101, the bending stress and tensile stress on the support layer 110 during bending can be released, preventing the support layer 110 from breaking. The support layer 110 of the display panel of this application can simultaneously cover the back plate 120 of the display panel in the bending area 101 and the non-bending area 102, so that the display panel has a larger heat dissipation area and improves the heat dissipation efficiency and heat dissipation effect of the display panel.

[0032] like Figure 1 and Figure 3 As shown, in this embodiment, the second thermally conductive material includes a second metal fiber 1121. The length of the second metal fiber 1121 is shorter than the length of the first metal fiber 1112. At least a portion of the second metal fiber 1121 is in contact with the first metal fiber 1112. The contact between the second metal fiber 1121 and the first metal fiber 1112 forms a contact point, which is beneficial for the second metal fiber 1121 to conduct heat to the first metal fiber 1112, thereby improving the heat conduction efficiency between the second heat dissipation layer 112 and the first heat dissipation layer 111, and giving the support layer 110 a better heat dissipation effect.

[0033] Specifically, the length of the second metal fiber 1121 is shorter than the length of the first metal fiber 1112. The second metal fiber 1121 is dispersed in the second thermally conductive material in an irregular direction, so that the second metal fiber 1121 can have more contact points with the first metal fiber 1112 after being dispersed in the second thermally conductive material, thereby improving the thermal conductivity of the support layer 110. In this embodiment, by having the second metal fiber 1121 in contact with the first metal fiber 1112, the material density of the support layer 110 is lower and the thermal conductivity is higher. Under the same thermal conductivity, the display panel of this application is lighter.

[0034] The length of the second metal fiber 1121 is less than the length of the carbon fiber 1122, so that the second metal fiber 1121 can be dispersed around the carbon fiber 1122, thereby improving the heat dissipation efficiency and heat dissipation uniformity of the second heat dissipation layer 112.

[0035] In this embodiment, after the second metal fiber 1121 is dispersed around the carbon fiber 1122, the end of a portion of the second metal fiber 1121 intersects with the first metal fiber 1112. The second metal fiber 1121 and the first metal fiber 1112 form an independent and efficient heat conduction channel, and the heat conduction channel has higher heat conduction efficiency.

[0036] In this embodiment, the first heat dissipation layer 111 further includes resin, the first thermally conductive material 1111 includes graphite particles, the graphite particles are mixed in the resin, and the first metal fiber 1112 and the second metal fiber 1121 are both copper fibers.

[0037] By dispersing and curing graphite particles with an adhesive, the risk of graphite falling out of the display panel is avoided. Graphite particles have good heat dissipation performance and can conduct heat to the first metal fiber 1112 or the air, increasing the heat dissipation area between the heat and the air. This allows the second heat dissipation layer 112 to conduct heat from the first heat dissipation layer 111 and distribute the heat evenly, achieving uniform heat dissipation of the back panel 120 and avoiding the problem of local overheating of the display panel.

[0038] Since this application uses granular graphite, the graphite particles have little impact on the mechanical properties of the first heat dissipation layer 111. This ensures that the first heat dissipation layer 111 has good bending performance, as well as high thermal conductivity and heat dissipation uniformity. This allows the support layer 110 to simultaneously cover the bending area 101 and the non-bending area 102 and dissipate heat from the back plate 120 located in the bending area 101 and the back plate 120 located in the non-bending area 102, thereby increasing the heat dissipation area of ​​the display panel.

[0039] In this embodiment, the particle size of the graphite particles ranges from 5μm to 20μm, so that the graphite particles in the first thermal conductive material 1111 can have a large contact area with the air, thereby improving the heat dissipation speed of the first thermal conductive material 1111.

[0040] Copper, as a soft material, has the advantages of good ductility and good thermal conductivity. The first metal fiber 1112 and the second metal fiber 1121 are made of copper fiber, which can ensure that the support layer 110 has ideal mechanical properties and heat dissipation performance.

[0041] Alternatively, the first metal fiber 1112 and the second metal fiber 1121 may be selected from metal fibers such as iron, aluminum, and gold.

[0042] The first metal fiber 1112 and the second metal fiber 1121 are selected from the same metal material to ensure that the heat conduction efficiency between the first metal fiber 1112 and the second metal fiber 1121 is consistent, so that the heat on the first metal fiber 1112 can be conducted outward in a timely manner through the second metal fiber 1121.

[0043] In this embodiment, the length of the second metal fiber 1121 ranges from 0.1 mm to 1 mm.

[0044] Specifically, the length of the second metal fiber 1121 is 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0045] Within the aforementioned range, the second metal fiber 1121 and the first metal fiber 1112 have more contact points, which improves the heat conduction efficiency between the second heat dissipation layer 112 and the first heat dissipation layer 111. The second metal fiber 1121 can be evenly dispersed in the second heat dissipation layer, ensuring that the second heat dissipation layer 112 can uniformly dissipate heat to the back plate 120.

[0046] In this embodiment, the length direction of the first metal fiber 1112 is parallel to the plane where the first heat dissipation layer 111 is located, ensuring that the surface of the first heat dissipation layer 111 away from the second heat dissipation layer 112 remains flat.

[0047] In this embodiment, the two ends of the first metal fiber 1112 are respectively located in the non-bending areas 102 on both sides of the bending area 101, and a portion of the first metal fiber 1112 is located in the bending area 101, so that the first metal fiber 1112 penetrates the bending area 101, thereby giving the portion of the first heat dissipation layer 111 located in the bending area 101 higher mechanical properties and making the first heat dissipation layer 111 less prone to breakage. The two ends of the carbon fiber 1122 are respectively located in the non-bending areas 102 on both sides of the bending area 101, and a portion of the carbon fiber 1122 is located in the bending area 101, so that the carbon fiber 1122 penetrates the bending area 101, thereby giving the portion of the second heat dissipation layer 112 located in the bending area 101 higher mechanical properties and making the second heat dissipation layer 112 less prone to breakage.

[0048] In this embodiment, the length of the first metal fiber 1112 is equal to or approximately equal to the length of the first heat dissipation layer 111 in the direction parallel to the length of the first metal fiber 1112.

[0049] Specifically, the first metal fiber 1112 penetrates the first heat dissipation layer 111 in a direction parallel to the plane of the first heat dissipation layer 111. This allows the heat from the first metal fiber 1112 to be conducted along its length and dissipated outward from both sides of the first heat dissipation layer 111 through its ends. On the other hand, it can be conducted to the first thermally conductive material 1111 through thermal contact. This allows the heat from the first metal fiber 1112 to be conducted outward in a timely manner, improving the heat dissipation uniformity and efficiency of the first heat dissipation layer 111. The parallelness of the first metal fiber 1112 to the plane of the first heat dissipation layer 111 also improves the overall mechanical properties of the first heat dissipation layer 111, giving it higher bending performance and making it less prone to breakage when bent.

[0050] In this embodiment, the boundary line between the bending area 101 and the non-bending area 102 is the fold line 103. The orthographic projection of the carbon fiber 1122 in at least one second heat dissipation layer 112 onto the back plate 120 is perpendicular to the orthographic projection of the fold line 103 between the bending area 101 and the non-bending area 102 onto the back plate 120. The orthographic projection of the first metal fiber 1112 onto the back plate 120 is perpendicular to the orthographic projection of the fold line 103 between the bending area 101 and the non-bending area 102 onto the back plate 120.

[0051] Specifically, the second heat dissipation layer 112 has higher tensile strength along the length of the carbon fiber 1122. The length of the carbon fiber 1122 is perpendicular to the length of the fold line 103, enabling the second heat dissipation layer 112 to have higher strength in the direction perpendicular to the fold line 103, ensuring that the second heat dissipation layer 112 will not break in the bending area 101. The length of the first metal fiber 1112 is perpendicular to the length of the fold line 103, which can improve the strength of the first heat dissipation layer 111 in the direction perpendicular to the fold line 103, ensuring that the first heat dissipation layer 111 will not break in the bending area 101.

[0052] In this embodiment, at least two second heat dissipation layers 112 are stacked, and the orthographic projections of the carbon fibers 1122 in two adjacent second heat dissipation layers 112 on the back plate 120 intersect.

[0053] Specifically, the more stacked second heat dissipation layers 112 there are, the greater the overall thickness of the support layer 110. Through the stacked second heat dissipation layers 112, and the intersecting projections of the carbon fibers 1122 in two adjacent second heat dissipation layers 112 on the back plate 120, the second heat dissipation layers 112 have a greater overall thickness, while the support layer 110 has higher tensile strength after multiple second heat dissipation layers 112 are stacked.

[0054] In this embodiment, a portion of the second metal fibers 1121 in two adjacent second heat dissipation layers 112 are in contact with each other, so that one second heat dissipation layer 112 that is attached to the back plate 120 can conduct heat to the second metal fibers 1121 of the next second heat dissipation layer 112 through the second metal fibers 1121, forming an efficient heat transfer channel.

[0055] In this embodiment, at least two second heat dissipation layers 112 are stacked, and the orthographic projections of the carbon fibers 1122 in two adjacent second heat dissipation layers 112 on the back plate 120 are perpendicular to each other, so that the support layer 110 has higher tensile strength.

[0056] In this embodiment, three second heat dissipation layers 112 are stacked. The first second heat dissipation layer 112 is attached to the back plate 120. The second second heat dissipation layer 112 is located on the side of the first second heat dissipation layer 112 away from the back plate 120. The third second heat dissipation layer 112 is located on the side of the second second heat dissipation layer 112 away from the back plate 120. The angle between the orthographic projection of the second metal fiber 1121 of the first second heat dissipation layer 112 on the back plate 120 and the orthographic projection of the fold line 103 on the back plate 120 is 0°. The angle between the orthographic projection of the second metal fiber 1121 of the second second heat dissipation layer 112 on the back plate 120 and the orthographic projection of the fold line 103 on the back plate 120 is 90°. The angle between the orthographic projection of the second metal fiber 1121 of the third second heat dissipation layer 112 on the back plate 120 and the orthographic projection of the fold line 103 on the back plate 120 is 0°.

[0057] Alternatively, four or more second heat dissipation layers 112 may be stacked.

[0058] In this embodiment, the second heat dissipation layer 112 further includes resin, and the second thermally conductive material and carbon fiber 1122 are both mixed in the resin. The second heat dissipation layer is bonded to the back plate 120 through the resin.

[0059] Specifically, the resin of the back plate 120 and the second heat dissipation layer 112 is fixed and formed by molding, so that no adhesive is needed between the second heat dissipation layer 112 and the back plate 120. This avoids the reduction of heat conduction efficiency between the back plate 120 and the second heat dissipation layer 112 due to the poor thermal conductivity of the adhesive. By directly bonding the second heat dissipation layer 112 to the back plate 120, the heat dissipation effect of the display panel is improved, while ensuring the strong adhesion between the second heat dissipation layer 112 and the back plate 120, thus improving the reliability of the display panel.

[0060] In this embodiment, the first heat dissipation layer 111 and the second heat dissipation layer 112 are integrally formed by molding. Specifically, the support layer 110 is a composite layer of the first heat dissipation layer 111 and the second heat dissipation layer 112.

[0061] Both the first heat dissipation layer 111 and the second heat dissipation layer 112 are made of flexible resin. Under the interaction of the two flexible resin layers, the first heat dissipation layer 111 and the second heat dissipation layer 112 are completely bonded together. The first heat dissipation layer 111 and the second heat dissipation layer 112 do not need to use adhesive, thus avoiding the problem of reduced heat conduction efficiency between the first heat dissipation layer 111 and the second heat dissipation layer 112 due to the poor thermal conductivity of the adhesive.

[0062] The materials of the first heat dissipation layer 111 and the second heat dissipation layer 112 also include curing agents, diluents and toughening agents.

[0063] In this embodiment, the diameter of carbon fiber 1122 ranges from 5µm to 15µm, and the diameters of the second metal fiber 1121 and the first metal fiber 1112 both range from 5µm to 15µm.

[0064] Specifically, the diameters of carbon fiber 1122 are 5um, 6um, 7um, 8um, 9um, 10um, 11um, 12um, 13um, 14um, and 15um.

[0065] The diameter of the first metal fiber 1112 is 5um, 6um, 7um, 8um, 9um, 10um, 11um, 12um, 13um, 14um, and 15um.

[0066] Within the aforementioned range, while ensuring that the support layer 110 has high thermal conductivity, it is also beneficial to make the display panel thinner and lighter.

[0067] In this embodiment, the thickness of the first heat dissipation layer 111 ranges from 10um to 30um, and the thickness of the second heat dissipation layer 112 ranges from 100um to 150um.

[0068] Specifically, the thickness of the first heat dissipation layer 111 is 10um, 12um, 13um, 14um, 16um, 18um, 19um, 20um, 21um, 25um, 26um, 28um, 29um, and 30um.

[0069] The thickness of the second heat dissipation layer 112 ranges from 100um, 110um, 120um, 130um, 140um, to 150um.

[0070] Within the aforementioned range, the second heat dissipation layer 112 can promptly conduct heat from the back plate 120 to the first heat dissipation layer 111, and the bending performance of the second heat dissipation layer 112 is better than that of the first heat dissipation layer 111. The second heat dissipation layer 112 is set to be thicker than the first heat dissipation layer 111, which can ensure that the support layer 110 has a good thermal conductivity while also enabling the support layer 110 to have high bending performance after the through hole 1101 is opened, and enabling the support layer 110 to meet the support requirements for the back plate 120.

[0071] In this embodiment, since the mechanical strength of the first heat dissipation layer 111 is less than that of the second heat dissipation layer 112, the thickness of the first heat dissipation layer 111 is set to be less than that of the second heat dissipation layer 112, so that the support layer 110 can meet the heat dissipation requirements while being able to be bent.

[0072] In this embodiment, in the first heat dissipation layer 111, the mass fraction of the first metal fiber 1112 is 30% to 45%, the mass fraction of graphite particles is 10% to 15%, and the mass fraction of flexible resin is 40% to 60%.

[0073] In the second heat dissipation layer 112, the mass fraction of the second metal fiber 1121 is 10% to 15%, the mass fraction of the carbon fiber 1122 is 30% to 45%, and the mass fraction of the flexible resin is 40% to 60%.

[0074] In this embodiment, the support layer 110 is provided with at least two through holes 1101, and the at least two through holes 1101 are arranged parallel to the fold line 103.

[0075] Based on the display panel provided in any of the above embodiments of this application, this application also provides a method for manufacturing a display panel, the method comprising:

[0076] Step S100: Press the first metal fiber 1112 with the first thermally conductive solution to form the prepreg of the first heat dissipation layer 111;

[0077] Step S200: Press carbon fiber 1122 with the second thermally conductive solution to form the prepreg of the second heat dissipation layer 112;

[0078] Step S300: Mold and fix the first heat dissipation layer 111, the second heat dissipation layer 112 and the back plate 120, and connect the support layer 110 to the back plate 120. The support layer 110 includes the first heat dissipation layer 111 and the second heat dissipation layer 112, and the second heat dissipation layer 112 is located between the first heat dissipation layer 111 and the second heat dissipation layer 112.

[0079] Step S100 specifically includes:

[0080] Graphite particles are mixed with liquid resin to obtain the first thermally conductive solution;

[0081] The first metal fiber 1112 is pressed together with the first thermally conductive solution to form the prepreg of the first heat dissipation layer 111.

[0082] Step S200 specifically includes:

[0083] The second metal fiber 1121 is mixed with liquid resin to obtain the second thermally conductive solution;

[0084] The carbon fiber 1122 is pressed together with the second thermally conductive solution to form the prepreg of the second heat dissipation layer 112.

[0085] Between steps S300, the prepreg of the first heat dissipation layer 111 and the prepreg of the second heat dissipation layer 112 are both in a semi-solid or liquid state.

[0086] In step S300, the backplate 120 is directly molded to the second heat dissipation layer 112 without the need for adhesive bonding, reducing the bonding process and thus lowering production costs.

[0087] The specific embodiments of this application have been described in detail above. The embodiments disclosed above are merely preferred embodiments of this application. Those skilled in the art can make many modifications and improvements without departing from the concept of this application. All such modifications and improvements fall within the scope of protection defined by the claims of this application.

Claims

1. A display panel, characterized in that, include: A panel body, the panel body including a bending area and a non-bending area, the non-bending area being located on both sides of the bending area; A support layer is disposed on the surface of the back panel of the panel body. The support layer is located within the bending area and the non-bending area of ​​the panel body. The support layer includes a first heat dissipation layer and a second heat dissipation layer. The second heat dissipation layer is disposed on the first heat dissipation layer and is located between the first heat dissipation layer and the back panel of the panel body. The first heat dissipation layer includes a first thermally conductive material and a first metal fiber. The first thermally conductive material is distributed around the first metal fiber. The second heat dissipation layer includes a second thermally conductive material and carbon fiber. The second thermally conductive material is distributed around the carbon fiber. The portion of the support layer located in the bending area has a through hole that penetrates both the first heat dissipation layer and the second heat dissipation layer. The second thermally conductive material includes a second metal fiber. The length of the second metal fiber is shorter than the length of the first metal fiber, and at least a portion of the second metal fiber is in contact with the first metal fiber.

2. The display panel as described in claim 1, characterized in that, The first heat dissipation layer comprises resin, the first thermally conductive material comprises graphite particles mixed in the resin, and the first metal fiber and the second metal fiber are both copper fibers.

3. The display panel as described in claim 1, characterized in that, The length of the second metal fiber ranges from 0.1 mm to 1 mm.

4. The display panel as described in any one of claims 1 to 3, characterized in that, The two ends of the first metal fiber are respectively located in the non-bending areas on both sides of the bending area, and a portion of the first metal fiber is located in the bending area. The two ends of the carbon fiber of at least one second heat dissipation layer are respectively located in the non-bending areas on both sides of the bending area, and a portion of the carbon fiber is located in the bending area.

5. The display panel as described in claim 4, characterized in that, The orthographic projection of the carbon fiber in at least one of the second heat dissipation layers onto the panel body is perpendicular to the orthographic projection of the fold line between the bent area and the non-bent area onto the panel body, and the orthographic projection of the first metal fiber onto the panel body is perpendicular to the orthographic projection of the fold line between the bent area and the non-bent area onto the panel body.

6. The display panel as described in claim 4, characterized in that, At least two second heat dissipation layers are stacked, and the orthographic projections of the carbon fibers in two adjacent second heat dissipation layers intersect on the back plate.

7. The display panel as described in any one of claims 1 to 3, characterized in that, The second heat dissipation layer further includes resin, in which the second thermally conductive material and the carbon fiber are mixed, and the second heat dissipation layer is bonded to the back plate through the resin.

8. The display panel as described in any one of claims 1 to 3, characterized in that, The diameter of the carbon fiber and the diameter of the first metal fiber both range from 5 μm to 15 μm.

9. The display panel as described in any one of claims 1 to 3, characterized in that, The thickness of the first heat dissipation layer ranges from 10um to 30um, and the thickness of the second heat dissipation layer ranges from 100um to 150um.

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