High-transmittance radiation refrigeration protective film capable of being applied to display device

Abstract

The utility model provides a high-transmittance radiation refrigeration protective film capable of being applied to a display device, and belongs to the field of radiation refrigeration, the high-transmittance radiation refrigeration protective film sequentially comprises a first release film layer, a silica gel layer, a flexible base material layer, a cooling layer, an OCA glue layer and a second release film layer from bottom to top; the cooling layer is formed by alternately stacking a plurality of first functional layers and a plurality of second functional layers. Spectrum regulation and control are achieved through the structural design of the multilayer film, efficient isolation of near-infrared bands is achieved on the premise that the display effect is not affected, other energy bands in sunlight are effectively blocked, and therefore the radiation cooling effect on a device is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a radiation refrigeration protective film technical field, concretely relates to a high radiation refrigeration protective film of high permeability that can be applied to display device. BACKGROUND

[0002] With the progress of science and technology and the development of display technology, display devices play an increasingly important role in daily life. However, display devices generate heat during operation, causing the device temperature to rise, which not only affects the stability and service life of the device, but also increases energy consumption. Traditional cooling methods, such as air cooling or liquid cooling, can reduce device temperature, but have problems such as high energy consumption and complex systems.

[0003] Radiative cooling is a new passive refrigeration technology with advantages such as no external energy input, no moving parts, and simple structure. Currently, radiative cooling materials are mainly used in outdoor buildings such as walls and roofs, but have certain limitations when applied to display devices. Although such materials can achieve high reflectivity in the solar radiation band (0.3-2.5 μm), they have insufficient transmittance in the visible light band (0.4-0.76 μm), which affects the visual effect of display devices. While improving visible light transmittance, it is often difficult to maintain high reflectivity in the solar radiation band, thereby affecting the effect of radiative cooling. In addition, the use environment of display devices is variable, and higher requirements are placed on the service life of radiative cooling materials. Existing radiative cooling materials often fail to meet the long-term use requirements of display devices in terms of weather resistance and durability. Therefore, developing a radiative cooling protective film that can achieve efficient radiative cooling, ensure high transmittance, and have a long service life is of great significance for improving the performance of display devices.

[0004] Therefore, it is necessary to design an improved high-transmittance radiative cooling protective film that can be applied to display devices to solve the above problems. UTILITY MODEL CONTENTS

[0005] In view of the technical problems in the background art, the present application provides a high-transmittance radiative cooling protective film that can be applied to display devices, aiming to solve the technical problems of insufficient spectral selectivity of existing radiative cooling materials, difficulty in balancing transmittance and cooling effect, and difficulty in ensuring service life.

[0006] The present application provides a high-transmittance radiative cooling protective film that can be applied to display devices, which comprises, from bottom to top, a first release film layer, a silicone layer, a flexible substrate layer, a cooling layer, an OCA adhesive layer, and a second release film layer; the cooling layer is composed of a plurality of layers of first functional layers and a plurality of layers of second functional layers arranged alternately.

[0007] As a further improvement of the present application, the material of the first functional layer is one or more of SiO2, SiO, MgF2, Al2O3, PRO4, PRO6, cryolite and AlF3, and the thickness is 20-300 nm.

[0008] As a further improvement of the present application, the material of the second functional layer is one or more of TiO2, Ti3O5, ZrO2, CeO2, HfO2, Nb2O5 and Ta2O5, and the thickness is 10-200 nm.

[0009] As a further improvement of the present application, the total number of the layers of the cooling layer is 8-60 layers.

[0010] As a further improvement of the present application, the material of the flexible substrate layer is one or more of PET, TAC, TPU, COP and COC, and the thickness is 25-100 μm.

[0011] As a further improvement of the present application, the thickness of the first release film layer is 50-100 μm.

[0012] As a further improvement of the present application, the thickness of the OCA adhesive layer is 10-50 μm.

[0013] As a further improvement of the present application, the thickness of the silica gel layer is 25-75 μm.

[0014] As a further improvement of the present application, the thickness of the second release film layer is 50-100 μm.

[0015] The present application has the following beneficial effects:

[0016] The present application provides a high-transparency radiation cooling protective film applicable to a display device, which comprises, from bottom to top, a first release film layer, a silica gel layer, a flexible substrate layer, a cooling layer, an OCA adhesive layer and a second release film layer; the cooling layer is formed by alternately stacking a plurality of first functional layers and a plurality of second functional layers.

[0017] The present application realizes precise control of the spectrum by the multi-layer film structure design of the first functional layer and the second functional layer, and by the combination of different materials, the transmission of specific wavebands is increased, and the reflection of other wavebands is increased, thereby realizing precise control of the spectrum.

[0018] The high-transparency radiation refrigeration protective film provided by the application is suitable for being attached to the surface of various materials for cooling, and can be applied to outdoor buildings such as glass, walls and roofs, and display devices such as electronic devices, and is an effective energy-saving and emission-reducing tool. Since the film can be attached to tempered glass, it does not affect or attenuate the high-strength performance of the tempered glass, so that the film has the radiation cooling capacity while maintaining the original strength of the tempered glass.

[0019] The above description is only a summary of the technical solutions of the application, in order to enable the technical means of the application to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the application, the following will briefly introduce the drawings used in the application. Obviously, the drawings described below are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Figure 1 The schematic diagram of the layer structure of the high-transparency radiation refrigeration protective film applicable to display devices provided by the embodiments of the application;

[0022] Figure 2 The structure schematic diagram of the cooling layer in the embodiments of the application;

[0023] Figure 3 The transmittance curve diagram of the high-transparency radiation refrigeration protective film applicable to display devices provided by the embodiments of the application;

[0024] Figure 4 The cooling effect diagram of the high-transparency radiation refrigeration protective film applicable to display devices provided by the embodiments of the application;

[0025] Explanation of reference numerals: 1, first release film layer; 2, silica gel layer; 3, flexible base material layer; 4, cooling layer; 41, first functional layer; 42, second functional layer; 5, OCA adhesive layer; 6, second release film layer. DETAILED DESCRIPTION

[0026] The embodiments of the technical solutions of the application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the application, and therefore only serve as examples, but cannot limit the protection scope of the application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0028] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0029] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0031] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0032] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0033] At present, the radiation cooling material is mainly applied to outdoor buildings such as walls and roofs, and has certain limitations when applied to display devices. Although such materials can achieve high reflectivity in the solar radiation band (0.3-2.5 μm), the transmittance in the visible light band (0.4-0.76 μm) is insufficient, which affects the visual effect of the display device. While improving the visible light transmittance, it is often difficult to maintain high reflectivity in the solar radiation band, thereby affecting the radiation cooling effect. The use environment of the display device is variable, and higher requirements are put forward for the service life of the radiation cooling material. The existing radiation cooling material is often difficult to meet the long-term use demand of the display device in terms of weather resistance and durability.

[0034] In order to solve the technical problems of the existing radiation cooling material, such as insufficient spectral selectivity, difficult to balance transmittance and cooling effect, and difficult to guarantee service life, the present application provides a high-transmittance radiation cooling protective film applicable to a display device. The present application realizes spectral regulation through the structural design of the multilayer film, realizes efficient isolation of the near-infrared band without affecting the display effect, thereby achieving the radiation cooling effect of the device.

[0035] Please refer to Figure 1 , in the first aspect, the present application provides a high-transmittance radiation cooling protective film applicable to a display device, which comprises, from bottom to top: a first release film layer 1, a silica gel layer 2, a flexible substrate layer 3, a cooling layer 4, an OCA adhesive layer 5 and a second release film layer 6; the cooling layer 4 is composed of a plurality of layers of first functional layer 41 and a plurality of layers of second functional layer 42 which are alternately stacked.

[0036] In the technical scheme of the embodiment of the present application, the first release film layer 1 is located at the bottom layer, used for temporary fixing and subsequent transfer and attachment of the protective film during manufacturing. The silica gel layer 2 is in close contact with the first release film layer 1, used for providing adhesion to ensure that the protective film can be firmly attached to the display device. The flexible substrate layer 3 serves as a support layer, providing overall strength and flexibility, facilitating attachment and operation. The cooling layer 4 is composed of a plurality of layers of first functional layers 41 and a plurality of layers of second functional layers 42 arranged alternately, which is the core part of realizing radiative cooling. The OCA adhesive layer 5, i.e., the optical transparent adhesive layer, serves as a bonding layer while maintaining optical transparency. The second release film layer 6 is located at the top layer, used for protecting the cooling layer 4 from external damage. Through the design of the multi-layer film, the present application realizes high transmittance in the visible light band, reduces visual color difference, and ensures the display effect of the display device. The alternating and laminated structure of the cooling layer 4 utilizes the interference effect of light to effectively reflect heat in the solar radiation band, realizing passive refrigeration effect. The combination of the silica gel layer 2 and the OCA adhesive layer 5 ensures that the protective film can be firmly attached to the display device, while being easy to remove and replace. Through the selection of materials and synergistic effect of each layer, the weather resistance and durability of the high-transmittance radiative cooling protective film are improved, prolonging the service life. In addition, the design of the protective film takes into account the compatibility with other parts of the display device, without affecting the structural strength and functionality of the device.

[0037] Further, in some embodiments, the material of the first functional layer 41 is one or more of SiO2, SiO, MgF2, Al2O3, PRO4, PRO6, cryolite, and AlF3, and the thickness is 20-300 nm.

[0038] In the technical scheme of the embodiment of the present application, in the visible light band, the low refractive index material and high transmittance of the first functional layer 41 ensure the clarity and color authenticity of the display device. In the near-infrared band, through the interference effect, these layers can reflect most of the solar radiation, reducing heat absorption and realizing radiative cooling effect. The selected materials have good weather resistance, can resist the influence of environmental factors (such as ultraviolet light, temperature change, etc.), and prolong the service life of the protective film. The thickness range of 20-300 nm can accurately control the interference conditions, thereby realizing the regulation of specific wave bands.

[0039] Further, in some embodiments, the material of the second functional layer 42 is one or more of TiO2, Ti3O5, ZrO2, CeO2, HfO2, Nb2O5, and Ta2O5, and the thickness is 10-200 nm.

[0040] In the technical solution of the embodiment of the present application, the material of the second functional layer 42 has a high refractive index in a specific waveband (such as a near-infrared waveband), which can effectively reflect light waves. When light waves pass through these high-refractive-index layers, which are arranged alternately with low-refractive-index layers, the light waves of a specific wavelength can be made to interfere constructively between the layers, enhancing the reflection effect. The thickness range of 10-200 nm allows the interference conditions to be precisely controlled, thereby achieving reflection of a specific waveband. In the solar radiation waveband, especially in the near-infrared waveband, the high-refractive-index layers can effectively reflect light waves, reducing the transfer of heat to the display device and achieving radiative cooling. By designing the thickness and material of the multiple high-refractive-index layers, reflection of a specific waveband can be achieved while allowing other wavebands (such as visible light) to pass through, thereby not affecting the visual effect of the display device. The selected materials have good weather resistance and can adapt to various environmental conditions, maintaining long-term stable optical performance.

[0041] Further, in some embodiments, the total number of layers of the cooling layer 4 is 8-60 layers.

[0042] In the technical solution of the embodiment of the present application, the cooling layer 4 includes not less than 4 layers of the first functional layer 41 and not less than 4 layers of the second functional layer 42. The cooling layer 4 with a suitable number of layers can provide sufficient heat conduction and radiation heat dissipation capacity, helping the electronic device or other heat-generating body to maintain within its optimal working temperature range. The multi-layer structure has high mechanical strength and durability, can withstand certain external forces and vibrations, can adapt to different working environments, and through effective heat dissipation, can reduce thermal stress and prolong the service life of the device.

[0043] Please refer to Figure 2 As shown in the figure, the first functional layer 41 and the second functional layer 42 are alternately stacked on the flexible substrate layer 3, the refractive index of the second functional layer 42 is greater than that of the first functional layer 41, and the interference effect of light is used. The stacking of different materials can increase the transmission of a specific waveband and increase the reflection of other wavebands, thereby achieving precise regulation of the spectrum. Specifically, the first layer of functional layer arranged on the flexible substrate layer 3 can be the first functional layer 41 or the second functional layer 42, which can meet the use requirements.

[0044] Further, in some embodiments, the material of the flexible substrate layer 3 is one or more of PET, TAC, TPU, COP and COC, and the thickness is 25-100 μm.

[0045] In the technical solutions of the embodiments of the present application, PET (polyethylene terephthalate), TAC (triacetyl cellulose), TPU (thermoplastic polyurethane), COP (cyclo olefin polymer), and COC (cyclo olefin copolymer) and other materials are selected as the material of the flexible substrate layer 3, and an appropriate thickness is set, which can provide mechanical strength and stability, meet the needs of various application scenarios, and achieve the best balance between product performance and cost.

[0046] Further, in some embodiments, the thickness of the first release film layer 1 is 50-100 μm.

[0047] In the technical solutions of the embodiments of the present application, the first release film layer 1 with an appropriate thickness can better resist physical impact and wear from the outside. The thickness of the first release film layer 1 of 50-100 μm can provide sufficient mechanical strength to protect other layers from being easily damaged during manufacturing, transportation, and assembly.

[0048] Further, in some embodiments, the thickness of the OCA adhesive layer 5 is 10-50 μm.

[0049] In the technical solutions of the embodiments of the present application, a thickness of 10-50 μm can ensure that the OCA adhesive layer 5 has good optical transparency and does not negatively affect the visual effect of the display device. Within this thickness range, the OCA adhesive layer 5 can provide sufficient bonding strength to firmly bond different materials together while maintaining good interface stability. A thinner OCA adhesive layer 5 helps to reduce the generation of air bubbles during lamination, improving the overall bonding quality. The OCA adhesive layer 5 has a certain flexibility and can adapt to the difference in expansion coefficient of different materials, reducing stress caused by temperature changes. The OCA adhesive layer 5 with an appropriate thickness can provide better durability, resist environmental factors (such as humidity, temperature, and ultraviolet light), and prolong the service life of the product.

[0050] Further, in some embodiments, the thickness of the silica gel layer 2 is 25-75 μm.

[0051] In the technical solutions of the embodiments of the present application, the silica gel layer 2 is located above the first release film layer 1 and has a thickness of 25-75 μm, which is used to adhere and fix the flexible substrate layer 3 while providing a certain sealing and buffering effect.

[0052] Further, in some embodiments, the thickness of the second release film layer 6 is 50-100 μm.

[0053] In the technical solutions of the embodiments of the present application, a thickness of 50-100 μm can provide sufficient physical strength to protect the cooling layer 4 from scratches and impacts during daily use. An appropriate thickness range can maintain high transparency and will not significantly affect the visual effect of the display device.

[0054] Some specific examples are listed below. It should be noted that the examples described below are exemplary and are intended to explain the present application only and should not be construed as limiting the present application. If a specific technique or condition is not specified in the examples, the technique or condition described in the literature in the art or according to the product manual is used. If the manufacturer of the reagent or instrument is not specified, it is a conventional product that can be obtained on the market.

[0055] Example 1

[0056] The present example provides a high-transmittance radiation refrigeration protective film applicable to a display device, which comprises, from bottom to top, a first release film layer 1, a silica gel layer 2, a flexible substrate layer 3, a cooling layer 4, an OCA adhesive layer 5, and a second release film layer 6. The thickness of the first release film layer 1 is 75 μm, the material of the flexible substrate layer 3 is PET, and the thickness is 50 μm. The thickness of the OCA adhesive layer 5 is 20 μm, the thickness of the silica gel layer 2 is 45 μm, and the thickness of the second release film layer 6 is 75 μm.

[0057] The cooling layer 4 is obtained by an electron beam evaporation coating system and is composed of 11 layers. The material of the first functional layer 41 is selected from SiO2(n = 1.46@550 nm) & MgF2(n = 1.38@550 nm), the particle size is selected to be 1-3 mm, and the coating rate is 4-6 A / s. The material of the second functional layer 42 is selected from TiO2(n = 2.35@500 nm), the particle size is selected to be 1-3 mm, and the coating rate is 2-2.5 A / s. The coating temperature is room temperature, and the vacuum degree is set to 1.0*10 -3 The energy of the SiO2 ion source assisted plating is 200 V, 7 A; the energy of the TiO2 ion source assisted plating is 250 V, 7.5 A; and the functional layer parameters of the cooling layer 4 from bottom to top are shown in Table 1:

[0058] Table 1 Cooling layer parameters

[0059]

[0060]

[0061] Comparative Example 1

[0062] Comparative Example 1 provides a high-transmittance radiation refrigeration protective film applicable to a display device. Compared with Example 1, the difference is only that the cooling layer 4 is not provided, and the other conditions and parameters are basically the same as those of Example 1.

[0063] The protective films provided by Example 1 and Comparative Example 1 are tested, and the reflectivity of the sunlight band is compared. The instrument used is a UV–vis–nir spectrophotometer (uv3600, Shimadzu) equipped with an integrating sphere model (ISR-3100), and the test range is 0.3-2.5 μm. As shown in Figure 1, the reflectivity of the protective film provided by Example 1 is lower than that of the protective film provided by Comparative Example 1.Figure 3 As shown in the results, the reflectivity of near-infrared light can be increased by 70% after using the cooling film of the present application.

[0064] Temperature comparison tests were performed on the protective films provided in Example 1 and Comparative Example 1. The protective films were attached to commercial mobile phone screens, and the temperature changes were recorded using a temperature tester under the condition of a bright screen continuously working. The lower the temperature, the better the cooling effect. The instrument used was a K-type thermocouple from Omega. The results are shown in Table 1. Figure 4 As shown in the results, the protective film with the cooling layer 4 can reduce the working temperature of the mobile phone by 4-7°C under outdoor conditions at an ambient temperature of about 35°C, and there is a significant temperature benefit.

[0065] It should be noted that the present application is not limited to the above embodiments. The above embodiments are only examples, and embodiments having substantially the same configuration and playing the same role and effect as the technical idea within the scope of the technical solutions of the present application are all included in the technical scope of the present application. In addition, within the scope of the main idea of the present application, various modifications that can be thought of by those skilled in the art, other ways constructed by combining part of the elements of the embodiments are also included in the scope of the present application.

Claims

1. A high-transmission radiation shield protective film applicable to a display device, characterized by, From bottom to top, it comprises a first release film layer, a silica gel layer, a flexible substrate layer, a cooling layer, an OCA adhesive layer and a second release film layer; the cooling layer is formed by alternately stacking a plurality of first functional layers and a plurality of second functional layers, and the refractive index of the second functional layer is greater than that of the first functional layer.

2. The high-transmission radiation shield protection film applicable to a display device according to claim 1, wherein, The thickness of the first functional layer is 20-300 nm.

3. The high-transmission radiation shield protection film applicable to a display device according to claim 2, wherein, The thickness of the second functional layer is 10-200 nm.

4. The high-transmission radiation shield protection film applicable to a display device according to claim 1, wherein, The total number of layers of the cooling layer is 8-60 layers.

5. The high-transmission radiation shield protection film applicable to a display device according to claim 1, wherein, The thickness of the flexible substrate layer is 25-100 μm.

6. The high-transmission radiation shield protection film applicable to a display device according to claim 1, wherein, The thickness of the first release film layer is 50-100 μm.

7. The high-transmission radiation shield protection film applicable to a display device according to claim 6, wherein, The thickness of the OCA adhesive layer is 10-50 μm.

8. The high-transmission radiation shield protection film applicable to a display device according to claim 7, wherein, The thickness of the silica gel layer is 25-75 μm.

9. The high-transmission radiation shield protection film applicable to a display device according to claim 1, wherein, The thickness of the second release film layer is 50-100 μm.

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