Adhesion structure and electronic device

An adhesion structure and an electronic device are provided. The adhesion structure includes a substrate and an adhesive layer. The adhesive layer is disposed on the substrate, and the adhesive layer includes a plurality of graphene microplates. A part of the graphene microplates protrude from two opposite surfaces of the adhesive layer. The thickness of the graphene microplates is greater than or equal to 0.3 nanometers and is less than or equal to 3 nanometers. The flake diameter of the graphene microplates is greater than or equal to 1 micrometer and is less than or equal to 30 micrometers. The adhesion structure can not only provide the adhesive function, but also improve the heat dissipation efficiency of electronic device.

CROSS REFERENCE TO RELATED APPLICATIONS

This Non-provisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No(s). 201921288466.0 filed in People's Republic of China on Aug. 9, 2019, the entire contents of which are hereby incorporated by reference.

BACKGROUND

Technology Field

The present disclosure relates to an adhesion structure and an electronic device with the adhesion structure.

Description of Related Art

With the progress of science and technology, the design and research of flat electronic devices, such as display panels, backlight modules, or lighting modules, are developed toward thinness, large size, and high performance. In the case of thinning, large scale and high performance, the electronic devices will inevitably generate more heat than before, so the “heat dissipation” is already an indispensable function of electronic devices.

Taking a flat display device, such as an organic light-emitting diode (OLED) display, as an example, a conventional technique is to attach a heat dissipation structure to the back of the display device by using, for example, an adhesive material for dissipating the heat energy generated by the display device to the environment through the heat dissipation structure. However, the conventional adhesive members are generally made of heat-insulating materials, and the thermal conductivity thereof is quite poor, which indirectly affects the heat dissipation efficiency of the display devices.

SUMMARY

An objective of this disclosure is to provide an adhesion structure and an electronic device with the adhesion structure. The adhesion structure can not only provide the adhesive function, but also improve the heat dissipation efficiency of electronic device.

To achieve the above, the present disclosure provides an adhesion structure, which comprises a substrate and a first adhesive layer. The first adhesive layer is disposed on the substrate, and the first adhesive layer comprises a plurality of first graphene microplates. A part of the first graphene microplates protrude from two opposite surfaces of the first adhesive layer. The thickness of each of the first graphene microplates is greater than or equal to 0.3 nanometers and is less than or equal to 3 nanometers, and the flake diameter of each of the first graphene microplates is greater than or equal to 1 micrometer and is less than or equal to 30 micrometers.

To achieve the above, the disclosure also provides an electronic device, which comprises a heat source, an adhesion structure and a heat dissipation structure. The adhesion structure is disposed on the heat source and comprises a substrate, a first adhesive layer and a second adhesive layer. The first adhesive layer is disposed on the substrate, and the second adhesive layer is disposed at one side of the substrate away from the first adhesive layer. The first adhesive layer or the second adhesive layer comprises a plurality of graphene microplates. A part of the graphene microplates protrude from two opposite surfaces of the first adhesive layer or the second adhesive layer. The thickness of each of the graphene microplates is greater than or equal to 0.3 nanometers and is less than or equal to 3 nanometers, and the flake diameter of each of the graphene microplates is greater than or equal to 1 micrometer and is less than or equal to 30 micrometers. The heat dissipation structure is connected to the heat source through the adhesion structure.

As mentioned above, in the adhesion structure and the electronic device with the adhesion structure of this disclosure, the adhesive layer(s) comprises graphene microplates, a part of the graphene microplates protrude from two opposite surfaces of the adhesive layer, and the graphene microplates are defined within specific conditions. Accordingly, the adhesion structure of this disclosure can provide the adhesive function, and improve the heat dissipation efficiency of electronic device.

DETAILED DESCRIPTION OF THE DISCLOSURE

The adhesion structure of this disclosure can be applied to various electronic devices such as, the mobile phone, laptop computer, tablet computer, TV, display device, backlight module, lighting module, or any of other flat electronic devices, and this disclosure is not limited. The adhesion structure can provide the adhesive function. Besides, when applied to the electronic device, the adhesion structure of this disclosure can also improve the heat dissipation efficiency of electronic device.

FIG.1Ais a schematic diagram of an adhesion structure according to an embodiment of this disclosure,FIG.1Bis a schematic diagram showing the graphene microplates in the adhesive layer of the adhesion structure as shown inFIG.1A, andFIGS.2A and2Bare enlarged views of the regions A and B of the adhesion structure as shown inFIG.1A.

Referring toFIGS.1A and1B, the adhesion structure1of this embodiment comprises a substrate11and an adhesive layer12.

The material of the substrate11can be, for example but not limited to, paper, cloth, polyester (e.g. polyethylene terephthalate, PET), or a combination thereof, and this disclosure is not limited thereto.

The adhesive layer12is disposed on the substrate11. In this embodiment, the adhesive layer12comprises two opposite surfaces, including an upper surface S1and a lower surface S2. For example, the upper surface S1of the adhesive layer is attached to the lower surface of the substrate11. As shown inFIGS.2A and2B, the adhesive layer12comprises a plurality of graphene microplates121and an adhesion material122, and the graphene microplates121are mixed in the adhesion material122. In addition, a part of the graphene microplates121are completely disposed inside the adhesive layer12, and a part of the graphene microplates121protrude from two opposite surfaces of the adhesive layer12. That is, some of the graphene microplates121protrude from the upper surface S1(FIG.2A) and the lower surface S2(FIG.2B) of the adhesive layer12.

Referring toFIG.1B, in the adhesive layer12, the thickness d of each graphene microplate121is greater than or equal to 0.3 nanometers and is less than or equal to 3 nanometers (0.3 nm≤d≤3 nm), and the flake diameter L of each graphene microplate121is greater than or equal to 1 micrometer and is less than or equal to 30 micrometers (1 μm≤L≤30 μm). In the adhesive layer12of this embodiment, the content of the graphene microplates121is greater than 0 and is less than or equal to 15% (0<the content of the graphene microplates121≤15%). For example, the content of the graphene microplates121can be 1.5%, 3.2%, 5%, 7.5%, 11%, or 13%. In addition, the adhesion material122can be, for example but not limited to, a pressure sensitive adhesive (PSA). The material of the adhesion material can be, for example, a rubber material, an acrylic material, a silicone material, or a combination thereof. The chemical composition thereof can be rubber, acrylic, or organic silicone, or a combination thereof. The present disclosure is not limited.

With reference toFIG.1A, since the adhesive layer12comprises the adhesion material122, so the adhesive layer12has the adhesive property. Accordingly, the lower surface S2of the adhesive layer12can attach the entire adhesion structure1including the substrate11and the adhesive layer12to another object. In addition, the adhesive layer12further comprises the graphene microplates121, the thickness d of each graphene microplate121is greater than or equal to 0.3 nanometers and is less than or equal to 3 nanometers, the flake diameter L of each graphene microplate121is greater than or equal to 1 micrometer and is less than or equal to 30 micrometers, and a part of the graphene microplates121protrude from two opposite surfaces of the adhesive layer12. Therefore, the adhesion structure1has the following advantages. (1) Since the graphene microplates121has very thin thickness (between 0.3 nm and 3 nm), small flake diameter (between 1 μm and 30 μm), and high thermal conductive coefficient, the adhesion structure1can not only provide the adhesive function, but also improve the heat dissipation efficiency of electronic device through the good thermal conduction of the graphene microplates121. (2) Since the graphene microplates121have high Young's modulus, the entire strength of the adhesion structure1can be enhanced. (3) Since the graphene microplates121also have the ability of absorbing electromagnetic waves, the adhesion structure1can provide the function of shielding the electromagnetic waves.

FIG.3is a schematic diagram of an adhesion structure according to another embodiment of this disclosure.

The configuration and connection of the components of the adhesion structure la as shown inFIG.3are mostly the same as those of the adhesion structure1of the previous embodiment. Different from the previous embodiment, the adhesion structure la of this embodiment further comprises a release layer13. The release layer13is disposed at one side of the adhesive layer12away from the substrate11. In this embodiment, the release layer13is disposed on the lower surface S2of the adhesive layer12for protecting the adhesive property of the adhesive layer12and allowing the adhesion structure la to be a single-sided adhesion. The material of the release layer13can be, for example but not limited to, paper, cloth, polyester (e.g. polyethylene terephthalate, PET), or a combination thereof, and this disclosure is not limited thereto. In practice, the user can peel off the release layer13, and then attach the lower surface S2of the adhesive layer12to an object, thereby adhering the adhesion structure1aincluding the substrate11and the adhesive layer12to the object. In some embodiments, the adhesion structure la can be an ultra-thin single-sided adhesion, and the thickness thereof is, for example, less than or equal to 2 μm.

FIGS.4A and4Bare schematic diagrams of adhesion structures according to different embodiments of this disclosure.

As shown inFIG.4A, the adhesion structure2comprises a substrate21, a first adhesive layer22and a second adhesive layer24.

The material of the substrate21can be, for example but not limited to, paper, cloth, polyester (e.g. polyethylene terephthalate, PET), or a combination thereof, and this disclosure is not limited thereto. In this embodiment, the material of the substrate21is PET, which can increase the support and structural strength of the adhesion structure2.

The first adhesive layer22is disposed on the substrate21. In this embodiment, the first adhesive layer22is disposed on the lower surface of the substrate21. Similar to the adhesive layer12of the above-mentioned adhesion structure1, the first adhesive layer22of this embodiment comprises a plurality of first graphene microplates and an adhesion material, and the first graphene microplates are mixed in the adhesion material. The adhesion material can be, for example but not limited to, a pressure sensitive adhesive (PSA). The material of the adhesion material can be, for example, a rubber material, an acrylic material, a silicone material, or a combination thereof. The chemical composition thereof can be rubber, acrylic, or organic silicone, or a combination thereof. The present disclosure is not limited. Moreover, similar to the graphene microplates121of the above-mentioned adhesion structure1, the thickness of each first graphene microplate of the first adhesive layer22can be greater than or equal to 0.3 nanometers and is less than or equal to 3 nanometers, and the flake diameter of each first graphene microplate can be greater than or equal to 1 micrometer and is less than or equal to 30 micrometers. Similar to the adhesive layer12of the above-mentioned adhesion structure1, in the first adhesive layer22, the content of the first graphene microplates can be greater than 0 and less than or equal to 15% (such as 1.5%, 3.2%, 5%, 7.5%, 11%, or 13%). Similar to the adhesive layer12of the above-mentioned adhesion structure1, in the first adhesive layer22, a part of the first graphene microplates are completely disposed inside the first adhesive layer22, and a part of the first graphene microplates protrude from two opposite surfaces (the upper surface S1and the lower surface S2) of the first adhesive layer22.

The second adhesive layer24is disposed at one side of the substrate21away from the first adhesive layer21. In this embodiment, the second adhesive layer24is disposed on the upper surface of the substrate21, which is away from the first adhesive layer22. The material, dimension (thickness, flake diameter, etc.), and scale of the second adhesive layer24can be the same as those of the first adhesive layer22. The second adhesive layer24comprises a plurality of second graphene microplates and an adhesion material, and the second graphene microplates are mixed in the adhesion material. A part of the second graphene microplates protrude from two opposite surfaces (the upper surface S3and the lower surface S4) of the second adhesive layer24. To be noted, in other embodiments, the second adhesive layer24and the first adhesive layer22can be made of the same material, but the dimensions and scales thereof can be different. This disclosure is not limited.

In this embodiment, the adhesion structure2is a double-sided adhesion, and the thickness thereof can be, for example, greater than or equal to 3 μm. In practice, the lower surface S2of the first adhesive layer22is attached to the object (e.g. the heat source) so as to adhere the adhesion structure2to the object. The upper surface S3of the second adhesive layer24can be, for example, connected to a heat dissipation structure. In this embodiment, the heat dissipation structure can be, for example, a heat dissipation film such as, for example but not limited to, a graphene thermal film (GTF). In other embodiments, the adhesion structure2can be attached to the object (e.g. the heat source) through the upper surface S3of the second adhesive layer24, and the lower surface S2of the first adhesive layer22is connected to the heat dissipation structure. This disclosure is not limited.

As shown inFIG.4B, the composition and connection of the adhesion structure2aof this embodiment are mostly the same as those of the adhesion structure2of the previous embodiment. Different from the previous embodiment, the adhesion structure2aof this embodiment further comprises a first release layer23and a second release layer25.

Similar to the release layer13of the above-mentioned adhesion structure1, the first release layer23of this embodiment is disposed at one side of the first adhesive layer22away from the substrate21. In this embodiment, the first release layer23is disposed on the lower surface S2of the first adhesive layer22, which is away from the substrate21. In addition, the second release layer25is disposed at one side of the second adhesive layer24away from the substrate21. In this embodiment, the second release layer25is disposed on the upper surface S3of the second adhesive layer24, which is away from the substrate21. In some embodiments, the adhesion structure2ais a double-sided adhesion, and the thickness thereof can be, for example, greater than or equal to 3 μm. Moreover, the material of the second release layer25can be the same as or different from the material of the first release layer23, and this disclosure is not limited.

In practice, the user can peel off the first release layer23, and then attach the lower surface S2of the first adhesive layer22to an object (e.g. the heat source), thereby adhering the adhesion structure2ato the object. In addition, the user can also peel off the second release layer25, and then attach the upper surface S3of the second adhesive layer24to, for example, a heat dissipation structure (e.g. the heat dissipation film). According to this configuration, the heat energy of the heat source can be conducted to the heat dissipation structure through the adhesion structure2a,thereby enhancing the heat dissipation efficiency.

This disclosure also provides an electronic device, which comprises a heat source, an adhesion structure and a heat dissipation structure. The adhesion structure is disposed on the heat source, and the heat dissipation structure is connected to the heat source through the adhesion structure. In this embodiment, the adhesion structure can be selected from any of the above-mentioned adhesion structures1,1a,2and2a,or any of the modifications thereof. The specific technical contents thereof can be referred to the above-mentioned embodiments, so the detailed descriptions thereof will be omitted. The adhesive layer of the adhesion structure comprises a plurality of graphene microplates, and a part of the graphene microplates protrude from two opposite surfaces of the adhesive layer. Accordingly, the graphene microplates can contact the heat source and the heat dissipation structure and provide the heat conduction path for transmitting the heat energy from the heat source to the heat dissipation structure through the adhesion structure, thereby dissipating the heat energy generated by the electronic device through the heat dissipation structure.

The electronic device can be, for example but not limited to, a flat display device or a flat light source, such as, for example but not limited to, a mobile phone, a laptop computer, a tablet computer, a TV, a display device, a backlight module, or a lighting module, or any of other flat electronic devices. In some embodiments, when the electronic device is a flat display device such as, for example but not limited to, a light emitting diode (LED) display device, an organic light emitting diode (OLED) display device, or a liquid crystal display (LCD) device, the heat source can be a display panel with a display surface. The adhesion structure can be directly or indirectly (e.g. through an adhesion material) attached to the surface of the display panel opposite to the display surface. Accordingly, the adhesion structure can connect the heat dissipation structure to the heat source, and assist the heat conduction and heat dissipation, thereby improving the heat dissipation efficiency of the flat display device. In other embodiments, when the electronic device is a flat light source such as, for example but not limited to, a backlight module, an LED lighting module, or an OLED lighting module, the heat source can be a light-emitting unit, which has a light emitting surface. The adhesion structure can be directly or indirectly (e.g. through the adhesion material) attached to the surface opposite to the light emitting surface. Accordingly, the adhesion structure can connect the heat dissipation structure to the heat source, and assist the heat conduction and heat dissipation, thereby improving the heat dissipation efficiency of the flat light source.

FIGS.5A to5Fare schematic diagrams showing the adhesion structure of this disclosure applied to the heat dissipation of a display device.

In some applications as shown inFIG.5A, an adhesion structure4, a heat dissipation film5, another adhesion structure6, and an elastic heat dissipation structure7are stacked on the back surface (the surface opposite to the display surface) of the display device3(the heat source, e.g. an OLED display panel) in order. The elastic heat dissipation structure7comprises a porous elastic member and a plurality of heat conductive members. The porous elastic member can be an elastic foam structure and comprise a plurality of pores. The material of the porous elastic member can be the same as that of a general foam, such as, for example but not limited to, acrylic resin, polyurethane (PU), polyethylene (PE), polypropylene (PP), ethylene-propylene-diene monomer (EPDM), ethylene vinyl acetate copolymer resin (EVA resin), or a combination thereof. Among the above-mentioned materials, the bubble shape formed by acrylic resin and polyurethane is a semi-closed cell, which has good flexibility and compressibility, good vibration absorption capacity, and good heat stability. The bubble shape formed by polyethylene and polypropylene is a closed cell, which has relatively poor compressibility and vibration absorption capacity, but has better humidity stability.

The heat conductive members are mixed in the porous elastic member. The heat conductive member can be a high heat conductive material and be prepared as the shape of particles, powders or microplates. The material of the heat conductive member can be, for example but not limited to, graphene, graphite, carbon nanotubes, aluminum oxide, zinc oxide, titanium oxide, boron nitride (BN), or a combination thereof, or any of other suitable high heat conductive materials. The material of the heat conductive member of this embodiment is graphene microplates, which are mixed in the porous elastic member in a “closest packing” manner. The limitations and conditions of the thickness and flake diameter of the graphene microplates can be referred to the above embodiments. Due to the “closest packing” structure, the contact area of the heat conductive member can be increased, so that the elastic heat dissipation structure7can achieve a relatively higher heat conduction effect.

As shown inFIG.5B, an elastic heat dissipation structure7, an adhesion structure4, a heat dissipation film5, and another adhesion structure6are stacked on the back surface of the display device3in order.

As shown inFIG.5C, an adhesion structure4, a heat dissipation film5, another adhesion structure6, an elastic heat dissipation structure7, and another adhesion structure8are stacked on the back surface of the display device3in order.

As shown inFIG.5D, an adhesion structure4, a heat dissipation film5, and an elastic heat dissipation structure7are stacked on the back surface of the display device3in order.

As shown inFIG.5E, an adhesion structure4, an elastic heat dissipation structure7, and a heat dissipation film5are stacked on the back surface of the display device3in order.

As shown inFIG.5F, an adhesion structure4, a heat dissipation film5, an elastic heat dissipation structure7, and another adhesion structure6are stacked on the back surface of the display device3in order.

Each of the adhesion structures4,6and8can be any of the above-mentioned adhesion structures1,1a,2and2a,and the modifications thereof, and this disclosure is not limited. In addition, the stacked configurations of the display device3, the elastic heat dissipation structure7, the heat dissipation film5, and the adhesion structures4,6and8in the above embodiments are for illustrations only. In other applications, these components can have different arrangements and configurations, which are determined based on the heat dissipation requirement of the heat source. This disclosure is not limited.

In summary, in the adhesion structure and the electronic device with the adhesion structure of this disclosure, the adhesive layer(s) comprises graphene microplates, a part of the graphene microplates protrude from two opposite surfaces of the adhesive layer, and the graphene microplates are defined within specific conditions. Accordingly, the adhesion structure of this disclosure can provide the adhesive function, and improve the heat dissipation efficiency of electronic device.