WO2020098066A1 - 散热膜层及具有该散热膜层的显示装置 - Google Patents

散热膜层及具有该散热膜层的显示装置 Download PDF

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Publication number
WO2020098066A1
WO2020098066A1 PCT/CN2018/122397 CN2018122397W WO2020098066A1 WO 2020098066 A1 WO2020098066 A1 WO 2020098066A1 CN 2018122397 W CN2018122397 W CN 2018122397W WO 2020098066 A1 WO2020098066 A1 WO 2020098066A1
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Prior art keywords
display device
layer
heat
metal layer
heat dissipation
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PCT/CN2018/122397
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English (en)
French (fr)
Inventor
覃川
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武汉华星光电半导体显示技术有限公司
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Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US16/320,144 priority Critical patent/US20210378155A1/en
Publication of WO2020098066A1 publication Critical patent/WO2020098066A1/zh

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/20—Cooling means
    • G06F1/203—Cooling means for portable computers, e.g. for laptops
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels
    • H05K7/20963—Heat transfer by conduction from internal heat source to heat radiating structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays

Definitions

  • the invention relates to the technical field of heat dissipation and heat conduction materials, in particular to a heat dissipation film layer and a display device having the heat dissipation film layer.
  • the design structure of the current display device is as follows: a cover outer sheet 110 is provided on the outermost side of the display device, and the display device is attached with foam 130 and copper foil 140 on the back of the display screen 120 To enhance the cooling effect of the display. A thermal conductive adhesive 213 is added on the copper foil 140 and the flexible printed circuit board 212 on the back of the display screen 120 to transfer heat, as shown in FIG. 2. In addition, the main function of the foam 130 is to increase cushioning and protect the display screen.
  • the above structure has the following defects: 1) The heat dissipation of the copper foil can only conduct heat; 2) The heat dissipation effect is limited when facing high heat generation; 3) As the integration degree of the display device becomes higher and higher, the simple foam Adding copper foil can not achieve good temperature control.
  • the object of the present invention is to provide a heat dissipation film layer and a display device having the heat dissipation film layer.
  • the present invention provides a heat dissipation film layer suitable for a display device.
  • the heat dissipation film layer includes: a first metal layer and a second metal layer, and a layer disposed between the first metal layer and the second metal layer A heat storage layer; the heat storage layer includes a plurality of sub-regions, the sub-regions have a square structure or a honeycomb structure, and each sub-region is filled with a mixed material of a heat storage material and a heat conductive material.
  • the invention also provides a heat dissipation film layer suitable for a display device.
  • the heat dissipation film layer includes: a first metal layer and a second metal layer, and disposed between the first metal layer and the second metal layer The heat storage layer.
  • the thickness of the first metal layer and the second metal layer is less than 40 ⁇ m.
  • the thickness of the heat storage layer is 100 ⁇ m to 300 ⁇ m.
  • the first metal layer and the second metal layer are made of one of copper, silver or aluminum.
  • the heat storage layer includes a plurality of sub-regions.
  • the plurality of sub-regions have a square structure.
  • the plurality of sub-regions have a honeycomb structure.
  • each of the sub-regions is filled with a mixed material of heat storage material and heat conduction material.
  • the mass fraction of the thermally conductive material accounts for 5% to 15% of the mixed material.
  • the present invention also provides a display device including a display screen, and a heat dissipation film layer as described above is provided on the back of the display screen.
  • the thickness of the first metal layer and the second metal layer is less than 40 ⁇ m.
  • the thickness of the heat storage layer is 100 ⁇ m to 300 ⁇ m.
  • the first metal layer and the second metal layer are made of one of copper, silver, or aluminum.
  • the heat storage layer includes a plurality of sub-regions.
  • the plurality of sub-regions have a square structure.
  • the plurality of sub-regions have a honeycomb structure.
  • each of the sub-regions is filled with a mixed material of a heat storage material and a heat conduction material.
  • the mass fraction of the heat conductive material accounts for 5% to 15% of the mixed material.
  • a foam layer is further provided between the back of the display screen and the heat dissipation film layer, and the foam layer is made of foam material.
  • the advantage of the present invention is that the heat dissipation film layer of the present invention utilizes heat storage materials to absorb the characteristics of stored heat energy, and encapsulates the material into a film layer, so that it is attached to the back of the display screen, while conducting heat Control the internal temperature of the display device by absorbing stored heat, so that the temperature of the entire display device is kept within a certain range, especially in the face of sudden heat generation inside the display device, such as high brightness of the display panel, overloading of the processor, battery
  • the heat storage material can absorb and store the heat, and slowly release it after the ambient temperature drops. This ensures the stability of the internal temperature of the display screen and the display device, thereby ensuring the normal display and life of the display screen, and also protects the components inside the display device.
  • the appropriate temperature increases the comfort of holding the display device .
  • FIG. 1 is a schematic structural diagram of a display device in the prior art.
  • FIG. 2 is a schematic diagram of the design of the back of the display screen in the prior art.
  • FIG. 3 is a schematic structural diagram of a heat dissipation film layer in an embodiment of the invention.
  • FIG. 4 is a schematic structural diagram of a display device in another embodiment of the invention.
  • FIG. 5 is a side view of the structure of the foam layer and the heat dissipation film layer in the embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of the foam layer and the heat dissipation film layer shown in FIG. 5.
  • FIG. 7 is a schematic diagram of a square structure of a sub-region in the embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a honeycomb structure of a sub-region in the embodiment of the present invention.
  • Embodiments of the present invention provide a heat dissipation film layer and a display device having the heat dissipation film layer. Each will be described in detail below.
  • the present invention provides a heat dissipation film layer, which includes: a first metal layer 310 and a second metal layer 320 and disposed on the first metal layer 310 and The heat storage layer 330 between the second metal layers 320. That is, the heat dissipation film layer includes a first metal layer 310, a heat storage layer 330, and a second metal layer 320 that are sequentially stacked and stacked.
  • the first metal layer 310 and the second metal layer 320 are made of copper material, which has good thermal conductivity, ductility and cost performance.
  • the first metal layer 310 and the second metal layer 320 may also be made of other metal materials such as silver or aluminum.
  • the heat dissipation film layer of the present invention uses the first metal layer 310, the heat storage layer 330, and the second metal layer 320. In this way, the two-layer metal layer is more conducive to electrostatic protection of the circuit of the display screen and reduces electromagnetic interference.
  • the heat storage layer 330 includes a plurality of sub-regions 331, and each sub-region 331 is filled with a mixed material of a heat storage material and a heat conductive material.
  • the heat storage layer 330 may also be directly made of a mixed material of heat storage materials and heat conductive materials. The mass fraction of the heat conductive material accounts for 5% to 15% of the mixed material.
  • the sub-regions 331 may have a square structure or a honeycomb structure. Therefore, the mixed materials filled in each of the sub-regions 331 do not interfere with each other.
  • the heat storage material in the heat storage layer 330 is a phase change material.
  • Phase change materials refer to substances that change the state of matter with temperature changes and can provide latent heat. The process of transforming physical properties is called a phase change process. At this time, the phase change material will absorb or release a large amount of latent heat.
  • the phase change material includes organic type, molten salt type, alloy type and composite type phase change material.
  • the organic type can be polyhydric alcohol such as polyethylene glycol (PEG), methyl-1,3-propanediol (AMP) Solid-solid phase change materials.
  • the alloys may be lower melting alloy phase change materials composed of metal elements such as Sn, Bi, Pb, Cd, Ga, and Sb.
  • the composite type may be paraffin material.
  • the thermally conductive material may be graphene, and graphene has a very high thermal conductivity, which is beneficial to the heat transfer of the heat dissipation film layer.
  • the thermally conductive material is not limited thereto.
  • the heat storage layer 330 stores heat in the form of phase change latent heat in the phase change material through the phase change material and graphene, and realizes conversion and utilization between different space-time positions.
  • the heat will be stored in the phase change material through the phase change latent heat; when the external temperature is low, the phase change material releases heat through the phase change process, thereby maintaining the temperature of the display device will not change too fast.
  • the thicknesses of the first metal layer 310 and the second metal layer 320 are preferably controlled below 40 ⁇ m, and the thickness range of the heat storage layer 330 of the small-sized display screen is recommended to be 100 ⁇ m-300 ⁇ m, but the thickness is When it is thick, it can have better temperature control effect, but it will increase the thickness of the display screen. If the design thickness is not high, the thickness can be increased appropriately.
  • the thickness of the entire display device can be excellently controlled.
  • the internal temperature of the entire display device is maintained within a certain range, which not only ensures the normal operation of the display screen and other components, but also reduces the life and performance damage of each device, and enhances user experience.
  • the present invention further provides a display device.
  • the display device includes a display screen 350, and the above heat dissipation film layer is provided on the back of the display screen 350.
  • the specific structure of the heat dissipation film layer includes: a first metal layer 310, a heat storage layer 330, and a second metal layer 320 that are sequentially stacked and stacked. That is, the structures of the first metal layer 310, the heat storage layer 330, and the second metal layer 320 are directly encapsulated to form an integrated heat dissipation film layer.
  • the first metal layer 310 and the second metal layer 320 are made of copper material, which has good thermal conductivity, ductility and cost performance.
  • the heat dissipation film layer of the present invention adopts the first metal layer 310 + the heat storage layer 330 + the second metal layer 320. In this way, the two metal layers are more conducive to electrostatic protection of the circuit of the display screen 350 and reduce electromagnetic interference.
  • the heat storage layer 330 includes a plurality of sub-regions 331, and each sub-region 331 has a square structure. In other embodiments, the sub-region 331 may be a honeycomb structure. The mixed materials in each sub-region 331 do not interfere with each other.
  • the heat storage layer 330 (that is, the heat storage material and graphene) is a separate film layer, which functions to control heat and conduction. The mass fraction of the heat conductive material accounts for 5% to 15% of the mixed material.
  • the heat storage material in the heat storage layer 330 is a phase change material.
  • the phase change material includes organic, molten salt, alloy, and composite phase change materials.
  • the organic substance may be polyethylene glycol (PEG), methyl-1,3-propanediol (AMP), and other polyols.
  • the alloys may be lower melting alloy phase change materials composed of metal elements such as Sn, Bi, Pb, Cd, Ga, and Sb.
  • the composite type may be paraffin material.
  • the thermally conductive material may be graphene, and graphene has a very high thermal conductivity, which is beneficial to the heat transfer of the heat dissipation film layer.
  • the heat storage layer 330 stores heat in the form of phase change latent heat in the phase change material through the phase change material and graphene, and realizes conversion and utilization between different space-time positions.
  • the heat will be stored inside the phase change material through the phase change latent heat; when the outside temperature is low, the phase change material releases heat through the phase change process, thereby maintaining the display device The internal temperature does not change too fast.
  • the graphene in the heat storage layer 330 has an extremely high thermal conductivity, so it is beneficial to the heat transfer of the heat dissipation film layer.
  • the thicknesses of the first metal layer 310 and the second metal layer 320 are preferably controlled below 40 ⁇ m, and the thickness range of the heat storage layer 330 of the small-sized display 350 is recommended to be 100 ⁇ m-300 ⁇ m, but the thickness When it is thicker, it can have better temperature control effect, but it will increase the thickness of the display screen. If the design thickness is not high, the thickness can be increased appropriately.
  • the thickness of the entire display device can be excellently controlled.
  • a foam layer 340 is also provided between the back of the display screen 350 and the heat dissipation film layer, and the foam layer 340 is made of foam material. This can increase the buffer and protect the display 350.
  • a cover glass 360 may also be provided on the outer surface of the display screen 350, and the cover glass 360 also serves to protect the display screen 350.
  • the heat dissipation film layer of the present invention utilizes heat storage materials to absorb the characteristics of stored heat energy, and encapsulates the material into a film layer so that it is attached to the back of the display screen, while conducting heat, it can be absorbed by storing heat Control the internal temperature of the display device, so that the temperature of the entire display device is kept within a certain range, especially in the face of sudden heat generation inside the display device, such as high brightness of the display panel, overloaded processor, abnormal battery, the pure heat dissipation is Unable to solve the large amount of heat in a short time.
  • the energy storage material can absorb the heat and store it, and slowly release it after the ambient temperature drops. This ensures the stability of the internal temperature of the display screen and the display device, thereby ensuring the normal display and life of the display screen, and also protects the components inside the display device.
  • the appropriate temperature increases the comfort of holding the display device .

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Abstract

本发明公开了一种散热膜层及采用该散热膜层的显示装置，所述散热膜层适用于显示装置，所述散热膜层包括：第一金属层和第二金属层以及设置在所述第一金属层和所述第二金属层之间的储热层。通过该设计可以改善显示屏幕的发热和显示装置内部的温度异常，并且减少屏幕和其他零部件因温度过高造成的寿命问题，以及提供合适的温度以增加握持显示装置的舒适感。

Description

散热膜层及具有该散热膜层的显示装置 技术领域
本发明涉及散热导热材料技术领域，尤其涉及一种散热膜层及具有该散热膜层的显示装置。
 背景技术
随着技术的不断发展。显示技术不断革新，基于不同原理的显示技术被广泛应用于各行各业中。然而目前的显示技术依然无可避免的面对伴随着发光产生的热量问题，加之当前显示装置集成程度越来越高，其部分电子元器件的发热同样影响了整个装置的稳定性，甚至有一定的安全风险。
参见图1至图2，目前的显示装置的设计结构为：显示装置的最外侧设置一盖外片110，显示装置在显示屏120的背面贴附泡沫（foam）130和铜箔（Cu）140，以增强显示屏的散热效果。在显示屏120的背面的铜箔140和柔性印刷电路板212上增加导热胶213，以传递热量，如同图2所示。另外，泡沫130的主要作用是增加缓冲，保护显示屏。
 技术问题
然而，上述结构存在以下缺陷：1）铜箔散热只能使热量传导出来；2）面对高发热量时，散热效果为有限；3）随着显示装置的集成程度越来越高，单纯的泡沫加铜箔无法实现很好的温度控制。
 技术解决方案
本发明的目的在于，提供一种散热膜层及具有该散热膜层的显示装置，通过该设计可以改善显示屏幕的发热和显示装置内部的温度异常，并且减少屏幕和其他零部件因温度过高造成的寿命问题，以及提供合适的温度以增加握持显示装置的舒适感。
本发明提供了一种散热膜层，适用于显示装置，所述散热膜层包括：第一金属层和第二金属层以及设置在所述第一金属层和所述第二金属层之间的储热层；所述储热层包括多个子区域，所述子区域呈方形结构或蜂巢结构，在每一子区域内填充有储热材料和导热材料的混合材料。
本发明提还供了一种散热膜层，适用于显示装置，所述散热膜层包括：第一金属层和第二金属层以及设置在所述第一金属层和所述第二金属层之间的储热层。
在本发明的一实施例中，所述第一金属层和所述第二金属层的厚度小于40µm。
在本发明的一实施例中，所述储热层的厚度为100µm至300µm。
在本发明的一实施例中，所述第一金属层和所述第二金属层采用铜、银或铝中的其中一种金属制成。
在本发明的一实施例中，所述储热层包括多个子区域。
在本发明的一实施例中，所述多个子区域呈方形结构.
在本发明的一实施例中，所述多个子区域呈蜂巢结构。
在本发明的一实施例中，在每一所述子区域内填充有储热材料和导热材料的混合材料。
在本发明的一实施例中，所述导热材料的质量分数占混合材料的5%～15%。
本发明还提供一种显示装置，所述显示装置包括一显示屏，在所述显示屏的背面设置有一上述的散热膜层。
在本发明所述显示装置的一实施例中，所述第一金属层和所述第二金属层的厚度小于40µm。
在本发明所述显示装置的一实施例中，所述储热层的厚度为100µm至300µm。
在本发明所述显示装置的一实施例中，所述第一金属层和所述第二金属层采用铜、银或铝中的其中一种金属制成。
在本发明所述显示装置的一实施例中，所述储热层包括多个子区域。
在本发明所述显示装置的一实施例中，所述多个子区域呈方形结构。
在本发明所述显示装置的一实施例中，所述多个子区域呈蜂巢结构。
在本发明所述显示装置的一实施例中，在每一所述子区域内填充有储热材料和导热材料的混合材料。
在本发明所述显示装置的一实施例中，所述导热材料的质量分数占混合材料的5%～15%。
在本发明所述显示装置的一实施例中，在所述显示屏背面与所述散热膜层之间还设有一泡沫层，所述泡沫层由泡沫材料制成。
 有益效果
本发明的优点在于，本发明所述散热膜层利用储热材料来吸收储存热能的特性，并且对该材料进行封装成膜层，使其贴附在显示屏的背面，在传导热量的同时可以通过吸收储存热量的方式来控制显示装置内部的温度，使得整个显示装置的温度保持在一定范围内，尤其是面对显示装置内部的突然发热，如显示面板高亮度、处理器超负荷运转、电池异常时，单纯的散热是无法解决短时间内的大量热量，此时储热材料可以将热量吸收并进行储存，待环境温度下降后缓缓释放。这样就保证了显示屏和显示装置内部温度的稳定，从而保证显示屏的正常显示和寿命，同时对显示装置内部的元器件也有保护作用，另外，合适的温度增加了握持显示装置的舒适感。
 附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术中的显示装置的结构示意图。
图2是现有技术中的显示屏背面设计示意图。
图3是本发明一实施例中的散热膜层的结构示意图。
图4是本发明另一实施例中的显示装置的结构示意图。
图5是本发明所述实施例中的泡沫层和散热膜层的结构侧视图。
图6是图5所示的泡沫层和散热膜层的结构示意图。
图7是本发明所述实施例中的子区域的方形结构示意图。
图8是本发明所述实施例中的子区域的蜂巢型结构示意图。
 本发明的实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明的说明书和权利要求书以及上述附图中的术语“第一”、“第二”、“第三”等（如果存在）是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应当理解，这样描述的对象在适当情况下可以互换。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含。
在本专利文档中，下文论述的附图以及用来描述本发明公开的原理的各实施例仅用于说明，而不应解释为限制本发明公开的范围。所属领域的技术人员将理解，本发明的原理可在任何适当布置的系统中实施。将详细说明示例性实施方式，在附图中示出了这些实施方式的实例。此外，将参考附图详细描述根据示例性实施例的终端。附图中的相同附图标号指代相同的元件。
本发明说明书中使用的术语仅用来描述特定实施方式，而并不意图显示本发明的概念。除非上下文中有明确不同的意义，否则，以单数形式使用的表达涵盖复数形式的表达。在本发明说明书中，应理解，诸如“包括”、“具有”以及“含有”等术语意图说明存在本发明说明书中揭示的特征、数字、步骤、动作或其组合的可能性，而并不意图排除可存在或可添加一个或多个其他特征、数字、步骤、动作或其组合的可能性。附图中的相同参考标号指代相同部分。
本发明实施例提供一种散热膜层及具有该散热膜层的显示装置。以下将分别进行详细说明。
参见图3所示，在本发明的一实施例中，本发明提供了一种散热膜层，其包括：第一金属层310和第二金属层320以及设置在所述第一金属层310和所述第二金属层320之间的储热层330。亦即，所述散热膜层包括依次粘贴叠加的第一金属层310、储热层330和第二金属层320。
其中，在本实施例中，所述第一金属层310和所述第二金属层320是由铜材料制成，其具有良好的导热性、延展性和性价比。当然在其他实施例中，所述第一金属层310和所述第二金属层320也可以是银或铝等其他金属材料制成。相较于传统的铜箔结构进行散热方式，本发明的散热膜层采用第一金属层310、储热层330和第二金属层320的方式。这样，两层的金属层更有利于对显示屏的电路进行静电保护，减少电磁干扰。
所述储热层330包括多个子区域331，在每一子区域331内填充有储热材料和导热材料的混合材料。当然，所述储热层330也可以直接由储热材料和导热材料的混合材料制成。所述导热材料的质量分数占混合材料的5%～15%。
另外，如图7和图8所示，所述子区域331可以为方形结构或蜂巢结构，于是，填充在所述每一子区域331内的混合材料彼此互不干扰。
所述储热层330中的储热材料为相变材料。相变材料是指随温度变化而改变物质状态并能提供潜热的物质。转变物理性质的过程称为相变过程，此时相变材料将吸收或释放大量的潜热。
其中，所述相变材料包括有机类、熔融盐类、合金类及复合类相变材料，有机物类可以为聚乙二醇（PEG）、甲基-1,3-丙二醇（AMP）等多元醇之类的固-固相变材料。合金类可以为Sn、Bi、Pb、Cd、Ga、Sb等金属元素组成的较低熔点合金相变材料。复合类可以为石蜡材料。
所述导热材料可以为石墨烯，石墨烯具有极高的导热系数，因此有利于所述散热膜层的热传递的散出。当然，在其他实施例中，所述导热材料不限于此。
因此，所述储热层330通过相变材料和石墨烯将热量以相变潜热形式储存在相变材料内部，实现在不同时空位置之间的转换和利用。当显示装置的温度异常升高时，热量会通过相变潜热储存在相变材料内部；当外界温度较低时，相变材料通过相变过程释放热量，从而维持显示装置内部温度不会变化太快。
另外，在本实施例中，第一金属层310和第二金属层320的厚度优选地控制在40µm以下，而小尺寸显示屏的储热层330的厚度范围建议在100μm-300μm，但厚度较厚时，可以有更好的温度控制效果，但会增加显示屏幕的厚度。如对设计厚度要求不高，厚度可适当增加。通过对第一金属层310、第二金属层320和储热层330的厚度合理选择，可以使整个显示装置的厚度得到极好的控制。
通过上述散热膜层的结构设计，使得整个显示装置的内部温度保持在一定范围内，既保证了显示屏和其他元器件的正常工作，也减少了对各个器件的寿命和性能损伤，并且增强了用户体验。
参见图4至图8所示，本发明还提供一种显示装置，所述显示装置包括一显示屏350，在所述显示屏350的背面设置有上述的散热膜层。所述散热膜层的具体结构为：包括依次粘贴叠加的第一金属层310、储热层330和第二金属层320。亦即，将第一金属层310、储热层330、第二金属层320结构进行直接封装，形成一整体的散热膜层。其中，在本实施例中，所述第一金属层310和所述第二金属层320是由铜材料制成，其具有良好的导热性、延展性和性价比。
相较于传统的铜箔结构进行散热方式，本发明的所述散热膜层采用第一金属层310+储热层330+第二金属层320的方式。这样，两层的金属层更有利于对显示屏350的电路进行静电保护，减少电磁干扰。
在本发明的实施例中，所述储热层330包括多个子区域331，每一子区域331呈方形结构，而在其他部分实施例中，所述子区域331可以为蜂巢结构，因此，填充在所述每一子区域331内的混合材料彼此互不干扰。在所述储热层330（即储热材料和石墨烯）为单独膜层，其起到控制热量和传导的功能。所述导热材料的质量分数占混合材料的5%～15%。
另外，所述储热层330中的储热材料为相变材料。所述相变材料包括有机类、熔融盐类、合金类及复合类相变材料，有机物类可以为聚乙二醇（PEG）、甲基-1,3-丙二醇（AMP）等多元醇之类的固-固相变材料。合金类可以为Sn、Bi、Pb、Cd、Ga、Sb等金属元素组成的较低熔点合金相变材料。复合类可以为石蜡材料。
所述导热材料可以为石墨烯，石墨烯具有极高的导热系数，因此有利于所述散热膜层的热传递的散出。
因此，所述储热层330通过相变材料和石墨烯将热量以相变潜热形式储存在相变材料内部，实现在不同时空位置之间的转换和利用。当显示装置（或显示屏350）的温度异常升高时，热量会通过相变潜热储存在相变材料内部；当外界温度较低时，相变材料通过相变过程释放热量，从而维持显示装置内部温度不会变化太快。另外，所述储热层330中的石墨烯具有极高的导热系数，因此有利于所述散热膜层的热传递的散出。
另外，在本实施例中，第一金属层310和第二金属层320的厚度优选地控制在40µm以下，而小尺寸显示屏350的储热层330的厚度范围建议在100μm-300μm，但厚度较厚时，可以有更好的温度控制效果，但会增加显示屏幕的厚度。如对设计厚度要求不高，厚度可适当增加。通过对第一金属层310、第二金属层320和储热层330的厚度合理选择，可以使整个显示装置的厚度得到极好的控制。
另外，在所述显示屏350背面与所述散热膜层之间还设有一泡沫层340，所述泡沫层340由泡沫材料制成。这样能够起到增加缓冲，保护显示屏350的效果。
在所述显示屏350的外表面还可以设置一盖玻片360，所述盖玻片360也起到保护显示屏350的作用。
本发明所述散热膜层利用储热材料来吸收储存热能的特性，并且对该材料进行封装成膜层，使其贴附在显示屏背面，在传导热量的同时可以通过吸收储存热量的方式来控制显示装置内部的温度，使得整个显示装置的温度保持在一定范围内，尤其是面对显示装置内部的突然发热，如显示面板高亮度、处理器超负荷运转、电池异常时，单纯的散热是无法解决短时间内的大量热量，此时储能材料可以将热量吸收并进行储存，待环境温度下降后缓缓释放。这样就保证了显示屏和显示装置内部温度的稳定，从而保证显示屏幕的正常显示和寿命，同时对显示装置内部的元器件也有保护作用，另外，合适的温度增加了握持显示装置的舒适感。
以上对本发明实施例所提供的一种散热膜层及具有该散热膜层的显示装置进行了详细介绍。应理解，本文所述的示例性实施方式应仅被认为是描述性的，用于帮助理解本发明的方法及其核心思想，而并不用于限制本发明。在每个示例性实施方式中对特征或方面的描述通常应被视作适用于其他示例性实施例中的类似特征或方面。尽管参考示例性实施例描述了本发明，但可建议所属领域的技术人员进行各种变化和更改。本发明意图涵盖所附权利要求书的范围内的这些变化和更改。
 工业实用性
本申请的主题可以在工业中制造和使用，具备工业实用性。

Claims (20)

  1. 一种散热膜层，适用于显示装置，其中所述散热膜层包括：一第一金属层和一第二金属层以及一设置在所述第一金属层和所述第二金属层之间的储热层；所述储热层包括多个子区域，所述多个子区域呈方形结构或蜂巢结构，在每一所述子区域内填充有储热材料和导热材料的混合材料。
  2. 一种散热膜层，适用于显示装置，其中所述散热膜层包括：一第一金属层和一第二金属层以及一设置在所述第一金属层和所述第二金属层之间的储热层。
  3. 根据权利要求2所述的散热膜层，其中所述第一金属层和所述第二金属层的厚度小于40µm。
  4. 根据权利要求2所述的散热膜层，其中所述储热层的厚度为100µm至300µm。
  5. 根据权利要求2所述的散热膜层，其中所述第一金属层和所述第二金属层采用铜、银或铝中的其中一种金属制成。
  6. 根据权利要求2所述的散热膜层，其中所述储热层包括多个子区域。
  7. 根据权利要求6所述的散热膜层，其中所述多个子区域呈方形结构。
  8. 根据权利要求6所述的散热膜层，其中所述多个子区域呈蜂巢结构。
  9. 根据权利要求6所述的散热膜层，其中在每一所述子区域内填充有储热材料和导热材料的混合材料。
  10. 根据权利要求9所述的散热膜层，其中所述导热材料的质量分数占混合材料的5%～15%。
  11. 一种显示装置，其中所述显示装置包括一显示屏，在所述显示屏的背面设置有一如权利要求2所述的散热膜层。
  12. 根据权利要求11所述的显示装置，其中所述第一金属层和所述第二金属层的厚度小于40µm。
  13. 根据权利要求11所述的显示装置，其中所述储热层的厚度为100µm至300µm。
  14. 根据权利要求11所述的显示装置，其中所述第一金属层和所述第二金属层采用铜、银或铝中的其中一种金属制成。
  15. 根据权利要求11所述的显示装置，其中所述储热层包括多个子区域。
  16. 根据权利要求15所述的显示装置，其中所述多个子区域呈方形结构。
  17. 根据权利要求15所述的显示装置，其中所述多个子区域呈蜂巢结构。
  18. 根据权利要求15所述的显示装置，其中在每一所述子区域内填充有储热材料和导热材料的混合材料。
  19. 根据权利要求18所述的显示装置，其中所述导热材料的质量分数占混合材料的5%～15%。
  20. 根据权利要求11所述的显示装置，其中在所述显示屏背面与所述散热膜层之间还设有一泡沫层，所述泡沫层由泡沫材料制成。
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