Heat blocking and heat diffusion sheets and heat transfer structures containing the same

Abstract

A heat blocking and heat diffusion sheet is provided. A heat blocking and heat diffusion sheet according to one embodiment of the present invention is implemented by including: a heat diffusion part which is a metal member for conducting heat received from a first heating member in a planar direction to form a hot spot with an area larger than the area of ​​the first heating member; a first heat blocking part which is a graphite member disposed on the upper part of the heat diffusion part and has a first surface and a second surface facing each other in the thickness direction, conducting heat received from the heat diffusion part through the first surface in a planar direction, but having a thermal conductivity in the thickness direction smaller than the planar direction to delay heat transfer to the upper part of the second surface; a second heat blocking part disposed on the first heat blocking part to block heat transfer from above toward the second surface of the first heat blocking part; and a protective part disposed on the second heat blocking part. According to this, while lowering the heat level of the first heating member, it is possible to minimize the transfer of received heat in a vertical direction or the transfer of external heat to the first heating member.

Description

Technology Field

[0001] The present invention relates to a heat-blocking and heat-diffusion sheet and a heat transfer structure including the same. Background Technology

[0002] Due to the increased integration of IC circuits resulting from industrial advancement, heat generation in various electronic components is on the rise, driven by trends toward hybrid packages, multi-modules, sealed integrated circuits such as LEDs, complex structures of electronic devices, and slim, miniaturized, and high-performance designs.

[0003] Accordingly, effectively dissipating the large amount of heat generated in the confined space within electronic devices to prevent malfunctions and damage to electronic components is emerging as an important challenge.

[0004] Meanwhile, considering the performance and durability of electronic devices, the devices are designed so that heat generated from the devices is released to the outside. However, there are different heat-generating components spaced apart in the heat transfer path of the designed heat dissipation structure, and as a result, heat generated from one heat-generating component is transferred to another heat-generating component, which degrades the performance of the heat-generating component or causes it to malfunction.

[0005] For example, in the case where an electronic device is a display and a heat-generating component is a self-emissive display panel, heat generated from other heat-generating components is transferred to the display panel through the heat dissipation member provided to dissipate heat, thereby causing a problem of afterimages during image display on the display panel.

[0006] Accordingly, there is an urgent need for research on heat transfer structures or heat transfer members employed to transfer heat from various heat-generating components within electronic devices to the outside, which can prevent adverse effects such as performance degradation or malfunction caused by heat generated from one heat-generating component being transferred to another. Prior art literature

[0007] Republic of Korea Published Patent Application No. 10-2007-0090917 The problem to be solved

[0008] The present invention has been devised in consideration of the above points and aims to provide a heat-blocking and heat-diffusion sheet capable of receiving heat from a plurality of LED elements, which are heating elements, to lower the heat generation level of the LED elements, while minimizing the transfer of the received heat in the vertical direction, thereby minimizing or preventing heat conduction or radiation to the upper surface of the sheet. For example, the invention aims to provide a heat-blocking and heat-diffusion sheet suitable for application to a self-emissive display panel. means of solving the problem

[0009] To solve the above-mentioned problem, the present invention provides a heat blocking and heat diffusion sheet comprising: a heat diffusion member which is a metal member for conducting heat received from a heating member in a planar direction to form a hot spot with an area larger than the area of ​​the heating member; a first heat blocking member which is a graphite member disposed on the upper part of the heat diffusion member and has a first surface and a second surface facing each other in the thickness direction, conducting heat received from the heat diffusion member through the first surface in a planar direction, but having a thermal conductivity in the thickness direction smaller than the planar direction to delay heat transfer to the upper part of the second surface; a second heat blocking member disposed on the first heat blocking member and for blocking heat transfer from the upper side toward the second surface of the first heat blocking member; and a protective member disposed on the second heat blocking member.

[0010] According to one embodiment of the present invention, the heating element is a display panel, and the heat blocking and heat diffusion sheet may be used to dissipate heat generated from the self-emissive display panel while blocking heat generated from a heat source disposed on the rear side of the self-emissive display panel from being transferred to the display panel side.

[0011] In addition, on both sides facing in the thickness direction of the heat diffusion part, a first adhesive layer for attaching to a first heating part and a second adhesive layer for attaching to a first heat blocking part may be further included.

[0012] In addition, the first heat blocking section and the second heat blocking section are each formed independently with a width and length smaller than that of the heat diffusion section, and the four sides of the first heat blocking section and the second heat blocking section can be sealed with a heat diffusion section and a protection section.

[0013] Alternatively, the width and length of the first and second heat blocking sections are each independently formed to be smaller than the width and length of the heat diffusion section, and a third adhesive layer may be further included that is disposed between the protection section and the heat diffusion section and surrounds the four sides of the first and second heat blocking sections to encapsulate the first and second heat blocking sections from the outside.

[0014] In addition, the metal member may include one or more of copper foil and aluminum foil, and the graphite member may include a natural graphite sheet.

[0015] In addition, the graphite member may have a thickness of 600 μm or less and a thermal conductivity in the plane direction of 400 W / m·K or more.

[0016] In addition, the horizontal and thickness-direction thermal conductivity of the heat diffusion section may be 350 to 550 W / m·K, the horizontal thermal conductivity of the first heat blocking section may be 400 W / m·K or higher, and the thickness-direction thermal conductivity may be 20 W / m·K or lower.

[0017] In addition, the heat diffusion portion may have a thickness of 20 to 100 μm, the first heat blocking portion may have a thickness of 200 to 600 μm, and the second heat blocking portion may have a thickness of 7 to 100 μm.

[0018] In addition, the second heat blocking part may be an air layer.

[0019] Additionally, the second heat blocker is an air layer, and to support the air layer, the second heat blocker may further include a pair of first support members arranged along any two opposing corners among the four corners of one side of the first heat blocker, and at least one intermediate support member arranged parallel to the first support member between the pair of first support members.

[0020] In addition, the first support member and the intermediate support member may be a support member comprising a support substrate and an adhesive layer disposed on both sides of the support substrate.

[0021] In addition, a heat-reflecting layer may be further provided between the protection part and the second heat-blocking part or on the protection part to reflect radiant heat incident on the exposed surface of the protection part upwards.

[0022] In addition, the first adhesive layer and the second adhesive layer may each independently further include a heat dissipation filler in an amount of 40 to 70 weight percent.

[0024] In addition, the present invention provides a heat transfer structure disposed between a first heating member and a second heating member spaced apart in a first direction, comprising: a heat blocking and heat diffusion sheet according to the present invention attached to the first heating member such that the thickness direction is the first direction and the heat diffusion side is adjacent to the first heating member; a heat dissipation member disposed on the second heating member and having a heat dissipation function for heat generated from the second heating member; and an air layer disposed between the heat blocking and heat diffusion sheet and the heat dissipation member, for blocking the transfer of heat from the second heating member to the first heating member through the heat dissipation member.

[0025] According to one embodiment of the present invention, the first heating element is a self-emissive display panel, the second heating element is a power supply board, and the heat dissipation member may be a bracket.

[0027] In addition, the present invention provides an electronic device comprising a heat transfer structure according to the present invention. Effects of the invention

[0028] The heat-blocking and heat-diffusing sheet according to the present invention receives heat generated from a plurality of LED elements employed as light sources within a display panel, thereby lowering the heat generation level of the LED elements. At the same time, it prevents the received heat from being transferred in a vertical direction, which could affect the circuit board controlling the power supply and various elements mounted thereon, or be transferred to an external housing, thereby preventing discomfort to the user. Furthermore, the heat-blocking and heat-diffusing sheet can minimize or prevent external heat from being received through the vertical direction and transferred to the display panel, thus resolving the problem of heat afterimages caused by heat received from the outside being transferred to the display panel. Additionally, the heat-blocking and heat-diffusing sheet according to one embodiment of the present invention can prevent dust from scattering due to damage or destruction of the layers within the heat-blocking and heat-diffusing sheet, thereby preventing malfunction or damage to the display device caused by dust, and thus can be widely applied to various types of display devices. Brief explanation of the drawing

[0029] FIGS. 1 to 4 are schematic cross-sectional views of a heat-blocking and heat-diffusion sheet according to various embodiments of the present invention. FIGS. 5 and 6 are schematic cross-sectional views of a heat transfer structure according to an embodiment of the present invention, and FIGS. 7 and 8 are cross-sectional schematic diagrams illustrating the heat transfer paths of each heat transfer structure equipped with a heat blocking and heat diffusion sheet according to FIGS. 3 and 4. Specific details for implementing the invention

[0030] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts unrelated to the explanation have been omitted to clearly explain the present invention, and the same reference numerals are assigned to identical or similar components throughout the specification.

[0032] Referring to FIG. 5, the heat blocking and heat diffusion sheet (100) according to the present invention has a heat dissipation surface (101) and a heat blocking surface (102) facing each other in the thickness direction, and has a heat dissipation function that lowers the temperature of the heat-generating part (200) by receiving heat from the first heat-generating part (200) through the heat dissipation surface (101), and has a function to block the received heat from moving in the thickness direction of the heat blocking and heat diffusion sheet (100) and being transferred upward in the normal direction of the heat blocking surface (102). In addition, when a component placed above the normal direction of the heat blocking and heat diffusion sheet (100) is a heat source, it has a function to block the heat generated from the second heat-generating part (500) from being transferred to the first heat-generating part (200) through the heat blocking and heat diffusion sheet (100) and the heat blocking surface (102).

[0033] delete

[0034] Referring to FIGS. 1 and 5, a heat blocking and heat diffusion sheet (100) according to one embodiment of the present invention comprises: a heat diffusion part (120) which is a metal member receiving heat from a first heating part (200); a first heat blocking part (110) which is a graphite member disposed on the upper part of the heat diffusion part (120) and has a first surface (111) and a second surface (112) facing each other in the thickness direction, and conducts heat received from the heat diffusion part (120) through the first surface (111) in the plane direction, but has a heat conductivity in the thickness direction smaller than the plane direction to delay heat transfer to the upper part of the second surface (112); a second heat blocking part (130) disposed on the first heat blocking part (110) and blocking heat transfer from the upper side toward the second surface (112) of the first heat blocking part (110); and a member disposed on the second heat blocking part (130). It includes a protective part (140).

[0035] The above-mentioned heat diffusion section (120) performs the role of inducing a high heat dissipation effect by conducting heat received from the first heating section (200) in a planar direction to form a hot spot with an area larger than the area of ​​the first heating section (200), thereby inducing faster planar heat diffusion through the first heat blocking section (110). The above-mentioned heat diffusion section (120) is a metal substrate, and any metal substrate commonly used in the industry can be used without limitation. The above-mentioned metal substrate may preferably be any one of copper foil, aluminum foil, silver foil, nickel foil, and gold foil, or an alloy containing two or more of these, or a metal film in which two or more of these are mixed or two types are laminated to form separate layers. More preferably, the metal substrate may be a metal foil containing one or more of copper foil and aluminum foil. Additionally, the thermal diffusion section (120) may have a thermal conductivity of 100 to 600 W / m·k in the plane direction and / or thickness direction, or, as another example, 350 to 550 W / m·k, which is advantageous for achieving a sufficient thermal diffusion effect.

[0036] In addition, the heat diffusion portion (120) may have a thickness of 15 to 100 μm, preferably 25 to 100 μm. If the thickness of the heat diffusion portion is less than 15 μm, it may not be able to achieve the desired level of heat dissipation characteristics, and the low heat capacity may significantly shorten the time required to reach heat saturation of the heat-blocking and heat-diffusion sheet. In addition, if the thickness exceeds 75 μm, it becomes difficult to thin the heat-blocking and heat-diffusion sheet, and as flexibility decreases, interlayer lifting and delamination may occur when attached to a surface with curvature or steps, which may reduce reliability.

[0037] Additionally, the heat diffusion portion (120) can be attached to the rear surface of the display panel, which is the attachment surface, through a first adhesive layer (151) disposed on one side. Additionally, a second adhesive layer (152) is disposed on the opposite side of the heat diffusion portion (120) and can be attached to the first heat blocking portion (110) through this.

[0038] The first adhesive layer (151) and the second adhesive layer (152) can be used without limitation as long as they are adhesive layers commonly used in the industry, and preferably, they can be formed with an adhesive layer forming composition comprising one or more adhesive components selected from the group consisting of acrylic resin, urethane resin, epoxy resin, silicone rubber, acrylic rubber, carboxy nitrile elastomer, phenoxy, and polyimide resin, more preferably acrylic resin. In addition, the adhesive layer forming composition may further include a curing agent if the adhesive component is a curable resin, and may further include additives such as a curing accelerator depending on the purpose. The curing agent can be used without limitation as long as it is a curing agent commonly used in the industry, and preferably, it may include one or more selected from the group consisting of epoxy-based curing agents, diisocyanate-based curing agents, secondary amine-based curing agents, tertiary amine-based curing agents, melamine-based curing agents, isocyanate-based curing agents, and phenol-based curing agents, more preferably an epoxy-based curing agent.

[0039] Additionally, the first adhesive layer (151) and the second adhesive layer (152) may each independently further include a known heat dissipation filler.

[0040] Additionally, the first adhesive layer (151) and the second adhesive layer (152) may each have a thickness of 7 to 55 μm independently, and preferably 7 to 20 μm. If the thickness of the adhesive layer is less than 7 μm, the interlayer adhesion strength may be reduced, and if the thickness exceeds 55 μm, it is not desirable in terms of thinning, and considering the limited thickness of the heat-blocking and heat-diffusion sheet (100), the thickness of the other layer becomes relatively thin, which may result in reduced heat dissipation and / or heat-blocking characteristics, or it may be difficult to place an air layer in the heat transfer structure to be implemented, or the thickness of the air layer may not be sufficient.

[0041] Additionally, the first adhesive layer (151) and the second adhesive layer (152) may each independently further include a heat dissipation filler in an amount of 40 to 70 weight percent based on the total weight of each adhesive layer. The heat dissipation filler may be any known heat dissipation filler without limitation and may include, for example, one or more selected from the group consisting of carbon-based, metal-based, and ceramic-based types, and a description of specific types of each series is omitted.

[0043] Meanwhile, the thermal diffusion portion (120), which is a metal substrate having a first adhesive layer (151) and a second adhesive layer (152) arranged on both sides, can perform a support function for each of the first adhesive layer (151) and the second adhesive layer (152). That is, compared to the case where the first heat blocking portion (110) is directly attached to the skin surface through the first adhesive layer (151) without the thermal diffusion portion (120) which is a metal substrate, the attachment characteristics on the skin attachment surface with curvature or step difference can be improved due to the metal substrate, and it is advantageous to achieve high-temperature reliability by minimizing the occurrence of lifting or peeling at the interface formed with the skin attachment surface or the first heat blocking portion (110) at high temperatures.

[0045] Next, a first heat blocking member (110) disposed on the heat diffusion member (120) described above will be explained. The first heat blocking member (110) has a first surface (111) and a second surface (112) facing each other in the thickness direction, and conducts heat received from the heat diffusion member (120) through the first surface (111) in the surface direction, but has a heat conductivity in the thickness direction that is smaller than the surface direction, thereby delaying heat transfer to the upper part of the second surface (112) and exhibiting a heat blocking effect in the thickness direction due to the relatively larger heat conductivity in the surface direction.

[0046] The first heat-blocking member (110) having such heat conduction characteristics is a graphite member and may be a single graphite sheet or a plurality of graphite sheets laminated together.

[0047] Additionally, the first heat blocking member (110) may have a thickness smaller than the distance between the first heating member (200) and the heat dissipation member (400) so that an air layer (300) can be formed between the heat blocking and heat dissipation member (400) and the heat dissipation member (400) when the heat blocking and heat diffusion sheet (100) is placed between the heat dissipation and heat diffusion sheet (100) and the heat dissipation member (400) when the heat dissipation member (400) attached to the second heating member (500) is placed between the first heating member (200) and the heat dissipation member (400), as in the heat transfer structure (1000) shown in FIG. 4, and preferably, the thickness of the first heat blocking member (110) may be less than 2 / 3 of the distance between the first heating member (200) and the heat dissipation member (400). Additionally, the first heat blocking member (110) may be configured to have a thickness of at least 1 / 4 of the distance between the first heating member (200) and the heat dissipation member (400) in order to secure thermal capacity and satisfy the desired minimum heat blocking performance. For example, when the distance between the first heating member (200) and the heat dissipation member (400) is 1 mm, the thickness of the heat blocking and heat diffusion sheet (100) may be 0.35 to 0.60 mm, and the thickness of the first heat blocking member (110) provided inside may be 0.3 to 0.4 mm.

[0048] However, if the thickness of the first heat blocking member (110) is reduced, there is a concern that the time for delaying heat transfer will be shortened due to a decrease in heat capacity. In order to offset this concern through heat transfer in a larger planar direction, the graphite material of the first heat blocking member (110) may be selected to have a grade with high thermal conductivity in the planar direction, and for example, a material with a thermal conductivity in the planar direction of 400 W / m·k or more, preferably 400 to 600 W / m·k, may be used. It is acceptable to use a material with a thermal conductivity in the planar direction exceeding 600 W / m·k, but a graphite material with a thermal conductivity in the planar direction exceeding 600 W / m·k may have a high unit cost and may not be easy to implement. In addition, the graphite member may have a thermal conductivity of 20 W / m·k or less in the thickness direction, which may be advantageous for achieving the desired thermal insulation performance through the first thermal insulation member (110).

[0049] The graphite member is not limited to having the aforementioned planar thermal conductivity and may include, for example, a natural graphite sheet, an artificial graphite sheet, and / or a multilayer graphene sheet. Additionally, as a specific example, among natural graphite sheets, it may be compressed natural graphite which is advantageous for achieving the aforementioned planar thermal conductivity at a thin thickness.

[0051] Next, a second train blocking unit (130) that is placed on the first train blocking unit (110) described above will be explained.

[0052] The second heat blocking member (130) is provided to minimize or prevent heat transfer to the second surface (112) of the first heat blocking member (110) from the second surface (112) of the first heat blocking member (110) in the normal direction of the surface direction and in the opposite direction of the normal direction.

[0053] Preferably, the second heat-blocking section (130) may be an air layer. Since heat is transferred through convection or radiation in the air layer, it can achieve superior heat-blocking performance compared to other materials. At the same time, it can induce reflection of heat radiated from the second surface (112) of the first heat-blocking section (110) through a heat-reflecting layer (143) provided in a protective section (140) such as the one shown in FIG. 3, which will be described later, thereby further improving the heat-blocking characteristics in the normal direction of the surface from the second surface (112) of the first heat-blocking section (110). If the second heat-blocking section (130) is filled with a material with low thermal conductivity rather than an air layer, heat transfer occurs through conduction rather than heat transfer such as radiation, making it difficult to generate heat radiation. Even if heat radiation is generated, heat reflection through the heat-reflecting layer (143) does not occur, so the heat-blocking improvement effect through heat reflection described above cannot be achieved.

[0055] Additionally, the second heat blocking section (130) may be implemented with a thickness of, for example, 7㎛ or more. If implemented with a thickness of less than 7㎛, it may be difficult to achieve a sufficient heat blocking effect, and if the second heat blocking section is an air layer, the structure of the second heat blocking section may collapse due to external forces applied, making it difficult to secure a sufficient volume for the second heat blocking section. Accordingly, in order to structurally prevent this, at least one intermediate support member (132') supporting between the first heat blocking member (110) and the protection member (140) as shown in FIG. 4 may be further included on the first heat blocking member (110). The intermediate support member (132') may have a structure in which an adhesive layer (132'b) is provided on both sides of a support material (132'a). Additionally, the intermediate support member (132') may have a shape that extends long in the direction of one corner of the first heat blocking member (110), or may have a width and length shorter than the length of one corner of the first heat blocking member (110), and a plurality of them may be provided to form islands spaced apart from each other on the first heat blocking member (110).

[0057] Meanwhile, the first heat blocking member (110) may have a structure in which the four sides of the first heat blocking member (110) are sealed to prevent dust that may be generated due to the material being graphite from leaking out and scattering outside the heat blocking and heat diffusion sheet (100).

[0058] In order to implement a structure in which the sides are sealed, a third adhesive layer (153) may be formed to surround the sides of the first heat-blocking section (110) and the second heat-blocking section (130), as an example, by being placed between the heat diffusion section (120) and the protection section (140). The third adhesive layer (153) prevents dust from scattering originating from the first heat-blocking section (110) and, when the second heat-blocking section (130) is an air layer, functions as a side wall of the second heat-blocking section (130), thereby enabling the second heat-blocking section (130) to realize a sealed space consisting of the first heat-blocking section (110), the third adhesive layer (153), and the protection section (140). The third adhesive layer (153) may be formed from a conventional adhesive component used in the industry, and a detailed description thereof is omitted as it is identical to the first adhesive layer (151) and second adhesive layer (152) described above.

[0059] Additionally, the third adhesive layer (153) may be a double-sided tape type that further includes a supporting material (not shown) as an intermediate layer to prevent thickness fluctuation caused by compression due to external force applied when attaching the heat blocking and heat diffusion sheet (100) to the surface to be attached. In particular, the first heat blocking part (110) may have a thicker thickness compared to other layers within the heat blocking and heat diffusion sheet (100), for example, the thickness may be 0.3 mm or more, which means that the thickness of the third adhesive layer (153) must exceed at least 0.3 mm. However, when a thick thickness is achieved using adhesive components without a supporting material, there is a risk that thickness fluctuation may occur due to compression caused by external force applied in the thickness direction, or that a gap may occur between the third adhesive layer (153), the first heat blocking part (110), and the second heat blocking part (130) as they are pushed outward from the side during compression. Accordingly, a support material may be further included as an intermediate layer, and the support material may be a polymer film having a material such as polyester, polyamide, or polyimide, which is used in conventional double-sided tape. Alternatively, the support material may be a metal support material to increase the heat accumulation capacity inside the heat blocking and heat diffusion sheet, thereby providing improved heat blocking performance. Since the metal support material may be the metal material described in the heat diffusion section (120) described above, the present invention omits a detailed description thereof. In addition, the support material is preferably at least 0.5 times the total thickness of the first heat blocking section (110) and the second heat blocking section (130), and this may be advantageous for achieving the desired effect through the support material.

[0061] Alternatively, as shown in FIG. 2, the length and width of the heat diffusion section (120) and the protection section (140) may be formed larger than those of the first heat blocking section (110), so that the four sides of the first heat blocking section (110) and the second heat blocking section (130) can be sealed through the heat diffusion section (120) and the protection section (140), and specifically, the heat diffusion section (120) and the protection section (140) can be attached through a second adhesive layer (152) provided on the heat diffusion section (120). When the four sides of the first heat blocking section (110) and the second heat blocking section (130) are sealed through the heat diffusion section (120) and the protection section (140) as shown in FIG. 2, there is an advantage in that the third adhesive layer (153) as shown in FIG. 1 can be omitted.

[0063] Meanwhile, as illustrated in FIG. 2, when the second heat blocking section (130) is composed of an air layer, the four sides of the first heat blocking section (110) and the second heat blocking section (130) are sealed through the heat diffusion section (120) and the protection section (140), the four sides of the second heat blocking section (130) collapse, and the central part of the second heat blocking section (130) may also have difficulty maintaining its designed volume due to external forces. Accordingly, the second heat blocking section (130) may further include a pair of first support members (131) arranged along any two opposing corners among the four corners of one side of the first heat blocking section (110) to support the air layer, and at least one intermediate support member (132) arranged parallel to the first support member (131) between the pair of first support members (131). The above pair of first support members (131) are arranged lengthwise along one side edge of the first heat blocking member (110) so as to support the structural collapse of the four sides of the second heat blocking member (130) when the four sides of the first heat blocking member (110) and the second heat blocking member (130) are sealed. Additionally, volume fluctuations caused by external forces on the second heat blocking member (130) can be minimized through the intermediate support member (132). At this time, the first support member (131) and the intermediate support member (132) may be in the form of having a support substrate (131a, 132a) and an adhesive layer (131b, 132b) on both sides of the support substrate (131a, 132a). Additionally, the above-mentioned support material (131a, 132a) may be a polymer film, for example, and the above-mentioned adhesive layer (131b, 132b) is identical to the description of the first adhesive layer (151) and the second adhesive layer (152) described above, so a detailed description is omitted.

[0065] Next, the protective member (140) disposed on the second heat-blocking member (130) described above performs the function of physically and chemically protecting the heat-blocking and heat-diffusion sheet (100) from the outside. The protective member (140) may be any conventional protective member in the industry without limitation. For example, the protective member (140) may be in the form of a non-porous film, a nanofiber web, or a non-porous film laminated on a nanofiber web. The non-porous film may be a film comprising one or more selected from the group consisting of polyimide, polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). In addition, the nanofiber web may be a nanofiber web formed from known materials such as urethane-based, fluorine-based, or polyacrylonitrile. The diameter of the nanofibers in the nanofiber web may be 1 μm or less, but is not limited thereto.

[0066] The above protective portion (140) may have a thickness of 10 to 100 μm, preferably 10 to 50 μm. If the thickness is less than 10 μm, protective performance such as wear resistance may be reduced, and if the thickness exceeds 100 μm, it is not desirable in terms of thin film formation and flexibility may be reduced, which may lead to interlayer delamination.

[0068] Meanwhile, referring to FIGS. 7 and 8, as illustrated in FIGS. 4, a heat reflective layer (142, 143) may be further included within the protective portion (140', 140") so that heat radiation is reflected from the heat transfer structure (1002, 1003), and the heat reflective layer (142, 143) may be placed on one or both sides of the protective film (141).

[0069] At this time, the thermal radiation pattern may vary depending on the placement location of the thermal reflective layer. Specifically, the thermal reflective layer (142) within the protective portion (140', 140") on the side of the thermal blocking and thermal diffusion sheet (100", 100'") that contacts the air layer (300) of the heat transfer structure (1002, 1003) can reflect the radiant heat (H4) transmitted from the heat dissipation member bracket (401) through the air layer (300) via the heat (H2) generated from the second heating member power board (510), thereby minimizing the transmission of heat generated from the second heating member power board (510) to the first heating member self-emissive display panel (201) via the thermal blocking and thermal diffusion sheet (100", 100'"), thereby enabling the realization of a superior thermal blocking structure. Additionally, the air layer within the thermal blocking and thermal diffusion sheet (100", 100'") A heat reflection layer (143) provided to be in contact with the second heat blocking section (130) reflects heat (H3) radiated from the second surface (112) of the first heat blocking section (110), thereby minimizing the transmission of heat (H) generated from the first heat-generating section, which is a self-emissive display panel (201), to the normal direction of the heat-blocking and heat-diffusion sheet (100'"), so as to enable a more superior heat blocking structure.

[0070] The heat reflective layer (142, 143) may be formed of a known material having heat reflective properties, and may be a metal material such as aluminum, for example, but is not limited thereto. In addition, the thickness of the heat reflective layer (142, 143) may be 2 to 50 μm, and if it has a thickness of a certain level or more, it may be advantageous to further enhance the heat blocking performance of the heat blocking and heat diffusion sheet (100", 100'") by accumulating heat received in addition to the heat reflective function.

[0072] Meanwhile, although FIGS. 3 and 4 are illustrated as including a heat reflection layer (142) on the heat cross-section side, it should be noted that, alternatively, only a heat reflection layer (143) in contact with the second heat blocking section (130) side may be provided.

[0074] In addition, the present invention may have the above-described heat-blocking and heat-diffusion sheet (100, 100', 100", 100"') positioned between two heat-generating parts spaced apart in one direction to exhibit heat dissipation performance for one side of the heat-generating part, while simultaneously exhibiting heat-blocking characteristics that prevent heat from one side from being transferred to the other side or heat from the other side to one side.

[0075] Referring to FIG. 6, the heat transfer structure (1000) is a heat transfer structure disposed between a first heating member (200) and a second heating member (500) that are spaced apart in a first direction, wherein the thickness direction is the first direction and the heat dissipation surface (101) of the heat blocking and heat diffusion sheet (100) is attached to the first heating member (200) so as to be adjacent to the first heating member (200); a heat dissipation member (400) disposed on the second heating member (500) and having a heat dissipation function for heat generated from the second heating member (500); and a heat dissipation member (400) disposed between the heat blocking and heat diffusion sheet (100) and the heat dissipation member (400) to block the transfer of heat from the second heating member (500) to the first heating member (200) through the heat dissipation member (400). It includes an air layer (300).

[0076] For example, the first heating element (200) may be a self-emissive display panel, the second heating element (500) may be a power supply board, and the heat dissipation member (400) may be a bracket to which the power supply board is fixed, and the heat transfer structure implemented with these components may be placed within the self-emissive display. The following describes the heat dissipation and heat blocking mechanisms of the first heating element, the second heating element, and the heat transfer structure, assuming a heat transfer structure placed within the self-emissive display.

[0078] Referring to FIGS. 6 to 8, the first heating element may be a self-emissive display panel (201) and may include a self-emissive layer (230) and glass substrates (210, 22) disposed on both sides of the self-emissive layer (230). The self-emissive display panel (201) may be a panel adopted in known self-emissive displays such as PDP or OLED, and the self-emissive layer (230) may be a known configuration selected according to the specific display panel, so the present invention omits a detailed description thereof.

[0080] Additionally, the second heating element may be a power supply board (510) positioned on the rear side opposite to the light emission direction of the self-emissive display panel (201). The power supply board (510) may include a plurality of components serving as a heat source mounted on one side and may be a known power supply board used in self-emissive displays, so the present invention omits a detailed description thereof.

[0082] Additionally, the bracket (401), which is a heat dissipation member, may be a known mechanism provided in a self-emissive display that fixes the power board (510) and transfers heat generated from the power board (510) to the housing side. Meanwhile, the heat dissipation member may be changed to an appropriate mechanism depending on the design of the self-emissive display, and in this case, the heat dissipation member may be a housing or a heat sink, etc., instead of a bracket.

[0084] To explain the heat dissipation and heat blocking mechanism of the heat transfer structure (1001, 1002, 1003), the heat blocking and heat diffusion sheet (100, 100', 100") receives heat (H) generated from the self-emissive layer (230) of the display panel (201) to the heat diffusion section (120) and conducts it in the plane direction to form a hot spot with a larger area. The heat (H1) conducted in the thickness direction through the heat diffusion section (120) is conducted to the first surface (111) of the first heat blocking section (110), which is a graphite member. Due to the thermal conductivity characteristics of the graphite member, the conducted heat (H1) is transferred with greater conductivity in the plane direction than in the thickness direction, thereby enabling the heat generated from the self-emissive display panel (201) to be rapidly dissipated to the outside. Additionally, due to the low thermal conductivity characteristics of the graphite member in the thickness direction, heat conduction in the thickness direction is delayed, and Heat received can be accumulated in the first heat blocking section (110), which has the largest heat capacity and is implemented with the relatively largest thickness within the limited thickness of the heat blocking and heat diffusion sheet (100, 100', 100").

[0085] After the first heat blocking section (110) becomes heat-saturated, heat (H1) is transferred to the second heat blocking section (130), which is an air layer, through the second surface (112). The second heat blocking section (130) then transfers the received heat in the form of convection or radiant heat (H3) to the protection section (140, 140', 140") and can transfer it to the heat-blocking and heat-diffusion sheet (100, 100', 100") through the protection section (140, 140', 140"). At this time, the heat reflection layer (143) provided within the protection section (140"), such as the heat-blocking and heat-diffusion sheet (100") according to one embodiment of the present invention, can reflect the radiant heat (H3) received from the second heat blocking section (130) to the second surface (112) of the first heat blocking section (110) as described above, thereby allowing for a larger It can be advantageous for generating a heat-blocking effect.

[0087] Additionally, heat (H2) generated from the power board (510), which is the second heating element, is transferred and conducted to the bracket (401), which is the heat dissipation element, and some of it can be transferred in the form of convection or radiant heat (H4) to the heat-blocking and heat-diffusion sheet (100, 100', 100") through the air layer (300). At this time, the heat-blocking and heat-diffusion sheet (100, 100', 100") can exhibit a heat-blocking effect that blocks heat from being transferred to the self-emissive display panel (201), which is the first heating element, through the second heat-blocking element (130).

[0088] At this time, the heat reflection layer (142) provided within the protective part (140', 140"), such as the heat blocking and heat diffusion sheet (100', 100") according to one embodiment of the present invention, can reflect the radiant heat (H4) received from the power board (510), which is the second heating part, through the bracket (401) to the air layer (300) side as described above, so that it may be advantageous to generate a greater heat blocking effect.

[0090] Although an embodiment of the present invention has been described above, the concept of the present invention is not limited to the embodiments presented in this specification. Those skilled in the art who understand the concept of the present invention may easily propose other embodiments within the scope of the same concept by adding, changing, deleting, or adding components, and such embodiments shall also be considered to fall within the scope of the concept of the present invention. Explanation of the symbols

[0091] 100, 100', 100", 100'": Heat blocking and heat diffusion sheet 110: First heat blocking section 120: Heat diffusion section 130: Second heat blocking section 140, 140', 140": Protection section 1000, 1001, 1002, 1003: Heat transfer structure 200: First heating section 300: Air layer 400: Heat dissipation member 500: Second heating section

Claims

Claim 1 A heat diffusion member which is a metal member for conducting heat received from a first heating member in a planar direction to form a hot spot with an area larger than the area of ​​the first heating member; a first heat blocking member which is a graphite member disposed above the heat diffusion member and having a first surface and a second surface facing each other in the thickness direction, conducting heat received from the heat diffusion member through the first surface in a planar direction, but having a thermal conductivity in the thickness direction smaller than that in the planar direction to delay heat transfer to the upper part of the second surface; and a second heat blocking member disposed on the first heat blocking member and for blocking heat transfer from above toward the second surface of the first heat blocking member. A heat blocking and heat diffusion sheet comprising: a protective portion disposed on the second heat blocking portion; wherein the second heat blocking portion comprises a second surface of the first heat blocking portion, a lower surface of the protective portion disposed spaced apart from the second surface, and an air layer surrounded by a side structure that encloses the four sides of the first heat blocking portion and the second heat blocking portion, and a support portion that supports between the second surface and the lower surface of the protective portion to maintain the air layer, wherein the side structure is formed by enclosing the four sides of the first heat blocking portion and the second heat blocking portion with the heat diffusion portion and the protective portion having a width and length longer than the width and length of the first heat blocking portion and the second heat blocking portion, or by enclosing the four sides of the first heat blocking portion and the second heat blocking portion with a third adhesive layer disposed between the heat diffusion portion and the protective portion having a width and length longer than the width and length of the first heat blocking portion and the second heat blocking portion. Claim 2 In claim 1, the first heating element is a display panel, and the heat blocking and heat diffusion sheet is a heat blocking and heat diffusion sheet intended to dissipate heat generated from the self-emissive display panel while blocking heat generated from the second heating element positioned on the rear side of the self-emissive display panel from being transferred to the display panel. Claim 3 A heat-blocking and heat-diffusion sheet according to claim 1, further comprising a first adhesive layer for attachment to a first heating element and a second adhesive layer for attachment to a first heat-blocking element on both sides facing in the thickness direction of the heat-diffusion element. Claim 4 delete Claim 5 In claim 1, the metal member comprises one or more of copper foil and aluminum foil, and the graphite member comprises a natural graphite sheet, forming a heat-insulating and heat-diffusing sheet. Claim 6 In claim 1, the graphite member has a thickness of 600 μm or less and a thermal conductivity in the plane direction of 400 W / m·K or more, forming a heat-blocking and heat-diffusion sheet. Claim 7 A heat-blocking and heat-diffusion sheet according to claim 1, wherein the horizontal and thickness-direction thermal conductivity of the heat-diffusion portion is 350 to 550 W / m·K, the horizontal thermal conductivity of the first heat-blocking portion is 400 W / m·K or higher, and the thickness-direction thermal conductivity is 20 W / m·K or lower. Claim 8 A heat-blocking and heat-diffusion sheet according to claim 1, wherein the heat diffusion portion has a thickness of 20 to 100 μm, the first heat-blocking portion has a thickness of 200 to 600 μm, and the second heat-blocking portion has a thickness of 7 to 100 μm. Claim 9 delete Claim 10 A heat-blocking and heat-diffusing sheet according to claim 1, wherein the support member comprises a pair of first support members arranged along any two opposing corners among the four corners of one side of the first heat-blocking member, and at least one intermediate support member arranged parallel to the first support member between the pair of first support members. Claim 11 In claim 10, the above-mentioned first support member and intermediate support member comprise a heat-blocking and heat-diffusion sheet comprising a support substrate and an adhesive layer disposed on both sides of the support substrate. Claim 12 A heat-blocking and heat-diffusion sheet according to claim 1, further comprising a heat-reflecting layer for reflecting radiant heat incident on the exposed surface of the protective part upward from the protective part, between the protective part and the second heat-blocking part, or on the protective part. Claim 13 In paragraph 3, the first adhesive layer and the second adhesive layer each independently further comprise a heat-insulating and heat-diffusion sheet containing 40 to 70 weight percent of a heat dissipation filler. Claim 14 A heat transfer structure disposed between a first heating member and a second heating member spaced apart in a first direction, comprising: a heat blocking and heat diffusion sheet according to any one of claims 1 to 3, 5 to 8, and 10 to 13, attached to the first heating member such that the thickness direction is the first direction and the heat diffusion side is adjacent to the first heating member; a heat dissipation member disposed on the second heating member and having a heat dissipation function for heat generated from the second heating member; and an air layer disposed between the heat blocking and heat diffusion sheet and the heat dissipation member, for blocking the transfer of heat from the second heating member to the first heating member through the heat dissipation member. Claim 15 In claim 14, the first heating element is a self-emissive display panel, the second heating element is a power supply board, and the heat dissipation element is a bracket, forming a heat transfer structure. Claim 16 An electronic device comprising a heat transfer structure according to paragraph 14.

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