Heat dissipation film for foldable display equipment

Abstract

The utility model discloses a heat dissipation film for foldable display equipment. The heat dissipation film comprises a heat dissipation composite layer, a first double-faced adhesive tape layer and a second double-faced adhesive tape layer, the heat dissipation composite layer comprises two heat dissipation parts and a bridging part connected with the two heat dissipation parts, the bridging part is correspondingly located in a folding area of the foldable display equipment, the bridging part is provided with a pre-bending area, and the pre-bending area is folded when the heat dissipation film is in an unfolded state and unfolded when the heat dissipation film is in a folded state; the heat dissipation composite layer comprises two packaging layers and a heat dissipation layer in the middle, and the heat dissipation layer is provided with a plurality of hollow patterns; the first double-faced adhesive tape layer and the second double-faced adhesive tape layer are arranged on the two sides of the heat dissipation composite layer and respectively comprise two independent double-faced adhesive tape subsections, and the two double-faced adhesive tape subsections and the two heat dissipation parts are arranged in a one-to-one correspondence mode. The heat tunnel penetrating through the two sides is formed through the bridging part, heat dissipation balance is achieved, the function of bending allowance is achieved through the arrangement of the pre-bending area, and the stability and reliability of the product are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat dissipation structures, and in particular relates to a heat dissipation film for a foldable display device. Background Art

[0002] Display devices generate heat when in use, so a heat dissipation structure is required to improve heat dissipation performance and avoid damage caused by overheating. For foldable display devices, such as the display screen of a foldable mobile phone, due to the presence of a bendable zone in the middle, two independent main and auxiliary heat dissipation films are often used to achieve heat dissipation. The changeable folding screen shape will change the heat dissipation capacity when folding and unfolding, and the internal distribution of components is not balanced. The heat dissipation environment on the motherboard and SoC (system chip) side will be more severe. The main heat dissipation film will generate too much heat, and the auxiliary heat dissipation film will not be able to play a role in sharing the heat dissipation, affecting the heat dissipation efficiency and service life of electronic devices such as foldable mobile phones. Improved technology connects the main and auxiliary heat dissipation films into one in the bending zone, but after multiple bends, it is easy to delaminate, wrinkle, and even break. In addition, when the screen is unfolded, the integrated heat dissipation film will squeeze the optical parts and other precision components inside the mobile phone in the bending zone, causing quality abnormalities. The stability and durability of the product are difficult to meet the requirements. Utility Model Content

[0003] The utility model aims to solve the deficiencies in the prior art and provides a heat dissipation film for a foldable display device.

[0004] In order to achieve the above objectives, the technical solution of the utility model is:

[0005] A heat dissipation film for a foldable display device comprises a heat dissipation composite layer, a first double-sided adhesive layer, and a second double-sided adhesive layer; the heat dissipation composite layer comprises two heat dissipation portions and a bridging portion connecting the two heat dissipation portions, the bridging portion being located corresponding to a folding area of the foldable display device, the bridging portion having a pre-bent area, the pre-bent area being folded when the heat dissipation film is unfolded, and being unfolded when the heat dissipation film is folded; the heat dissipation composite layer comprises two encapsulation layers and a heat dissipation layer sandwiched between the two encapsulation layers, the heat dissipation layer having a plurality of hollow patterns; the first double-sided adhesive layer and the second double-sided adhesive layer are disposed on both sides of the heat dissipation composite layer, each comprising two independent double-sided adhesive sections, the two double-sided adhesive sections being disposed in one-to-one correspondence with the two heat dissipation portions.

[0006] Optionally, the hollow patterns include a plurality of first hollow patterns located at the heat dissipation portion and a plurality of second hollow patterns located at the bridging portion, and a size of the first hollow patterns is larger than a size of the second hollow patterns.

[0007] Optionally, the first hollow pattern is a through hole with an aperture of 3 to 5 mm; and the second hollow pattern is a through hole with an aperture of 1 to 3 mm.

[0008] Optionally, the plurality of hollow patterns are dispersedly distributed, occupying 5-15% of the area of the heat dissipation layer.

[0009] Optionally, the heat dissipation layer is a graphite layer or a graphene layer with a thickness of 40 to 60 μm.

[0010] Optionally, the encapsulation layer is a Mylar tape with a thickness of 8 to 12 μm; the edge of the encapsulation layer extends outward by 0.5 to 1.5 mm relative to the edge of the heat dissipation layer to form an edge.

[0011] Optionally, the pre-bending area forms a Z-shaped fold when the heat dissipation film is unfolded.

[0012] Optionally, it also includes a support layer arranged on the outside of the second double-sided adhesive layer, the support layer includes two independent support layer sections, the two double-sided adhesive sections of the second double-sided adhesive layer are bonded to the two support layer sections in a one-to-one correspondence, and the pre-bending area is located in the setting gap between the two support layer sections.

[0013] Optionally, it further includes a third double-sided adhesive layer adhered to the support layer and located on the periphery of the heat dissipation portion, the thickness of the third double-sided adhesive layer being the same as the sum of the thicknesses of the heat dissipation composite layer, the first double-sided adhesive layer and the second double-sided adhesive layer.

[0014] Optionally, the width of the bridging portion is smaller than that of the heat dissipation portion, and further includes a single-sided adhesive layer adhered to the support layer and located outside the bridging portion, wherein the thickness of the single-sided adhesive layer is smaller than that of the heat dissipation composite layer.

[0015] The beneficial effects of the utility model are:

[0016] A heat tunnel is created on both sides through the bridge part to achieve uniform heat dissipation effect and balanced heat dissipation, which can improve the heat dissipation effect by 10%; the heat dissipation layer is hollowed out and encapsulated on both sides by the packaging layer to improve the adhesion of the heat dissipation layer, avoid delamination after multiple bending, and improve product stability; the setting of the pre-bending area of the bridge part realizes the function of bending allowance, avoiding quality abnormalities caused by the bridge part squeezing other optical parts after the foldable display device is unfolded, and improving product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the exploded structure of a heat dissipation film according to an embodiment;

[0018] Figure 2 Schematic top view of the heat dissipation composite layer;

[0019] Figure 3 Fold the pre-bending area of the heat dissipation composite layer ( Figure 1 A local enlarged schematic diagram of the area (center A);

[0020] Figure 4 is a schematic diagram of the exploded structure of a heat dissipation film according to another embodiment;

[0021] Figure 5 for Figure 4 Schematic diagram of the top view structure of the heat dissipation film. DETAILED DESCRIPTION

[0022] The following further explains the present invention with reference to the accompanying drawings and specific embodiments. The drawings are provided for illustrative purposes only to facilitate understanding of the present invention, and their specific proportions may be adjusted according to design requirements. Those skilled in the art will understand that the vertical relationships between components and the definitions of front and back in the figures described herein refer to the relative positions of components. Therefore, they can be flipped to present the same components, and this is within the scope of this disclosure.

[0023] refer to Figures 1 to 3 The heat dissipation film for a foldable display device of the embodiment includes a heat dissipation composite layer 1, a first double-sided adhesive layer 2, and a second double-sided adhesive layer 3. The heat dissipation composite layer 1 includes two heat dissipation parts 1a, 1b and a bridge part 1c connecting the two heat dissipation parts 1a, 1b. The bridge part 1c corresponds to the folding area of the foldable display device. The bridge part 1c has a pre-bent area 1d. The pre-bent area 1d is folded when the heat dissipation film is in the unfolded state, and unfolded when the heat dissipation film is in the folded state. The unfolded state mentioned here refers to the state in which the heat dissipation parts 1a and 1b are in the same plane, that is, corresponding to the unfolded state of the foldable device; the folded state mentioned here refers to the state in which the heat dissipation parts 1a and 1b form an angle relative to each other and overlap up and down, that is, corresponding to the folded state of the foldable device. The heat dissipation composite layer 1 includes two packaging layers 11 and a heat dissipation layer 12 sandwiched between the two packaging layers 11. The heat dissipation layer 12 has a plurality of hollow patterns 121. The first double-sided adhesive layer 2 includes two independent double-sided adhesive sections 21 and 22, and the second double-sided adhesive layer 3 includes two independent double-sided adhesive sections 31 and 32. The double-sided adhesive sections 21 and 22 are arranged on one side of the heat dissipation composite layer 1 corresponding to the two heat dissipation sections 1a and 1b, and the double-sided adhesive sections 31 and 32 are arranged on the other side of the heat dissipation composite layer 1 corresponding to the two heat dissipation sections 1a and 1b, thereby forming two heat dissipation units connected only by the bridge section 1c of the heat dissipation composite layer 1, wherein the bridge section 1c creates a heat tunnel running through the two heat dissipation units, making the heat dissipation more uniform; at the same time, the pre-bending area 1d realizes the function of bending margin to avoid squeezing other optical parts when the foldable display device is unfolded.

[0024] The heat dissipation layer 12 is a graphite or graphene layer with a thickness of 40 to 60 μm. It has the characteristics of rapid heat dissipation and flexible deformation. The hollow pattern 121 includes a plurality of first hollow patterns 121a located in the heat dissipation portions 1a and 1b and a plurality of second hollow patterns 121b located in the bridge portion 1c. The size of the first hollow pattern 121a is larger than the size of the second hollow pattern 121b. For example, the first hollow pattern 121a is a through hole with a diameter of 3 to 5 mm, and the second hollow pattern 121b is a through hole with a diameter of 1 to 3 mm. These through holes are dispersed, and the total hollow area accounts for 5 to 15% of the area of the heat dissipation layer 12. The encapsulation layer 11 is, for example, Mylar tape with a thickness of 8 to 12 μm. Mara tape is a single-sided tape, including a polyester (PET) film and an acrylic adhesive layer. The heat dissipation layer is covered by the two adhesive layers of the Mara tape relative to each other, and the edge of the packaging layer extends outward by 0.5 to 1.5 mm relative to the edge of the heat dissipation layer to form a rim 111, which can effectively avoid the problem of bending and chipping of the graphite material; and through the punched hollow design of the graphite material, after the graphite is encapsulated with the adhesive, the adhesion of the graphite can be guaranteed, avoiding delamination after repeated bending and affecting the heat dissipation effect.

[0025] The pre-bending area 1d is pre-shaped during the processing of the heat dissipation film. For example, the indentation required for the Z-shaped folding is formed when the two heat dissipation parts 1a and 1b are horizontal. Therefore, after assembly, the foldable display device also forms a Z-shaped fold in the unfolded state, with a relatively flat connecting surface, thereby avoiding the bending wrinkles from squeezing other optical parts and causing quality abnormalities.

[0026] The first double-sided adhesive layer 2 and the second double-sided adhesive layer 3 are both disconnected at the bridge portion 1c, that is, they do not cover the bridge portion 1c, thereby avoiding the influence on the folding and unfolding action corresponding to the bridge portion 1c. The first double-sided adhesive layer 2 and the second double-sided adhesive layer 3 are made of PSA adhesive, for example, with a thickness of 3 to 8 μm. Figure 4 and Figure 5In another embodiment, the heat dissipation film further includes a support layer 4 outside the second double-sided adhesive layer 3. The support layer 4 includes two independent support layer sections 41 and 42. The two double-sided adhesive sections 31 and 32 of the second double-sided adhesive layer 3 are aligned with the two support layer sections 41 and 42 in a one-to-one correspondence. The pre-bent region 1d is located in the gap between the two support layer sections 41 and 42. When the heat dissipation film is unfolded, its Z-shaped fold extends through the gap and is located outside the support layer 4. The support layer 4 is, for example, a SUS stainless steel sheet with a thickness of 40 to 60 μm. The area of the support layer sections 41 and 42 is larger than that of the heat dissipation sections 1a and 1b. A third double-sided adhesive layer 5 is also included outside the heat dissipation sections 1a and 1b and is attached to the support layer sections 41 and 42. The thickness of the third double-sided adhesive layer 5 is equal to the sum of the thicknesses of the heat dissipation composite layer 1, the first double-sided adhesive layer 2, and the second double-sided adhesive layer 3, thereby achieving a smooth surface. The third double-sided adhesive layer 5 is, for example, VHB tape, comprising a foam substrate and adhesive layers on either side of the foam substrate. The width of the bridge portion 1c is smaller than that of the heat dissipation portions 1a and 1b. Outside the bridge portion 1c, a single-sided adhesive layer 6 is attached to the support layer sections 41 and 42, respectively. This single-sided adhesive layer 6 comprises four independent structures, and its thickness is less than that of the heat dissipation composite layer 1, compensating for the thickness difference while minimizing the impact on the active area.

[0027] The above-mentioned heat dissipation film is suitable for foldable display devices such as foldable mobile phones. It solves the problems of poor heat dissipation and poor assembly accuracy of existing structures, ensuring the quality and stability of the product.

[0028] The above embodiments are only used to further illustrate a heat dissipation film for a foldable display device of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A heat dissipation film for a foldable display device, characterized in that: It includes a heat dissipation composite layer, a first double-sided adhesive layer and a second double-sided adhesive layer; the heat dissipation composite layer includes two heat dissipation parts and a bridging part connecting the two heat dissipation parts, the bridging part is located corresponding to the folding area of the foldable display device, and the bridging part has a pre-bending area, the pre-bending area is folded when the heat dissipation film is unfolded, and is unfolded when the heat dissipation film is folded; the heat dissipation composite layer includes two packaging layers and a heat dissipation layer sandwiched between the two packaging layers, and the heat dissipation layer has a plurality of hollow patterns; the first double-sided adhesive layer and the second double-sided adhesive layer are arranged on both sides of the heat dissipation composite layer, respectively including two independent double-sided adhesive divisions, and the two double-sided adhesive divisions are arranged in a one-to-one correspondence with the two heat dissipation parts.

2. The heat dissipation film for a foldable display device according to claim 1, wherein: The hollow patterns include a plurality of first hollow patterns located at the heat dissipation portion and a plurality of second hollow patterns located at the bridge portion, and the size of the first hollow patterns is larger than that of the second hollow patterns.

3. The heat dissipation film for a foldable display device according to claim 2, wherein: The first hollow pattern is a through hole with a hole diameter of 3 to 5 mm; the second hollow pattern is a through hole with a hole diameter of 1 to 3 mm.

4. The heat dissipation film for a foldable display device according to claim 1, wherein: The plurality of hollow patterns are dispersed and occupy 5 to 15% of the area of the heat dissipation layer.

5. The heat dissipation film for a foldable display device according to claim 1, wherein: The heat dissipation layer is a graphite layer or a graphene layer with a thickness of 40 to 60 μm.

6. The heat dissipation film for a foldable display device according to claim 5, characterized in that: The packaging layer is a Mylar tape with a thickness of 8 to 12 μm; the edge of the packaging layer extends outward by 0.5 to 1.5 mm relative to the edge of the heat dissipation layer to form an edge.

7. The heat dissipation film for a foldable display device according to claim 1, wherein: The pre-bending area forms a Z-shaped fold when the heat dissipation film is in an unfolded state.

8. The heat dissipation film for a foldable display device according to claim 1, wherein: It also includes a support layer arranged on the outside of the second double-sided adhesive layer, the support layer includes two independent support layer sections, the two double-sided adhesive sections of the second double-sided adhesive layer are bonded to the two support layer sections in a one-to-one correspondence, and the pre-bending area is located correspondingly in the setting gap between the two support layer sections.

9. The heat dissipation film for a foldable display device according to claim 8, wherein: It also includes a third double-sided adhesive layer attached to the support layer and located on the periphery of the heat dissipation part, and the thickness of the third double-sided adhesive layer is the same as the sum of the thicknesses of the heat dissipation composite layer, the first double-sided adhesive layer and the second double-sided adhesive layer.

10. The heat dissipation film for a foldable display device according to claim 8, wherein: The width of the bridge portion is smaller than that of the heat dissipation portion, and the bridge portion further comprises a single-sided adhesive layer attached to the support layer and located outside the bridge portion, wherein the thickness of the single-sided adhesive layer is smaller than that of the heat dissipation composite layer.

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