Reflecting film and backlight source module

Abstract

The utility model relates to a reflecting film and a backlight source module. The reflecting film comprises a transparent base material layer, a silver layer, a diffusion barrier layer and an aluminum layer which are sequentially stacked. The diffusion barrier layer comprises at least one of an aluminum oxide layer, a silicon dioxide layer, a titanium dioxide layer, an aluminum nitride layer, a silicon nitride layer, an ITO layer, an AZO layer, a GZO layer, an IZO layer, a ZTO layer and a graphene layer. According to the reflecting film, the silver layer is arranged on the transparent base material layer and has high reflectivity, and the aluminum layer is arranged on the back surface of the silver layer to serve as the brightness compensation layer, so that the silver layer can be thinned under the condition that the high reflectivity is kept, and the cost is reduced. Moreover, the diffusion barrier layer is arranged between the silver layer and the aluminum layer, so that aluminum atoms can be prevented from diffusing to the silver layer, and the reduction of the reflection efficiency is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of optical elements, in particular to a reflective film and a backlight module. Background Art

[0002] Silver has high reflectivity in the visible and infrared wavelengths. Reflective films based on the principle of specular reflection from a silver layer possess exceptional optical properties. Reflective films are crucial optical components in backlight modules, reflecting light that leaks from the bottom of the light guide plate, reducing light loss and increasing backlight module brightness. They are widely used in LCD TVs, laptops, and mobile phones.

[0003] The reflective performance of a silver reflective film is positively correlated with the thickness of the silver layer. However, as a precious metal, silver is expensive. By placing a high-reflectivity, low-cost aluminum layer behind the silver layer to compensate for luminance loss, the silver layer can be thinned and costs reduced. However, research has found that this arrangement causes the thin silver layer to turn slightly pink over time, reducing its reflective efficiency. Utility Model Content

[0004] Based on this, it is necessary to provide a reflective film and a backlight module to solve the problem that the thin silver layer becomes slightly pink and the reflection efficiency decreases due to the aluminum layer being provided behind the silver layer.

[0005] A reflective film includes a transparent substrate layer, a silver layer, a diffusion barrier layer and an aluminum layer stacked in sequence, wherein the diffusion barrier layer includes at least one layer selected from the group consisting of an aluminum oxide layer, a silicon dioxide layer, a titanium dioxide layer, an aluminum nitride layer, a silicon nitride layer, an ITO layer, an AZO layer, a GZO layer, an IZO layer, a ZTO layer and a graphene layer.

[0006] In one embodiment, the thickness of the silver layer is 50 nm to 100 nm, the thickness of the diffusion barrier layer is 2 nm to 10 nm, and the thickness of the aluminum layer is 20 nm to 60 nm.

[0007] In one embodiment, the transparent substrate layer is a polymer layer.

[0008] In one embodiment, the reflective film further includes a primer layer, which is disposed between the transparent substrate layer and the silver layer. The primer layer includes at least one of a polyurethane layer, an acrylic layer, and a cycloolefin copolymer layer.

[0009] In one embodiment, a first inorganic anti-corrosion layer is provided around the periphery of the silver layer.

[0010] In one embodiment, a second inorganic anti-corrosion layer is provided around the periphery of the aluminum layer.

[0011] In one embodiment, the reflective film further includes an anti-reflection layer, and the anti-reflection layer is disposed on a side of the transparent substrate layer away from the silver layer.

[0012] In one embodiment, the anti-reflection layer includes a first refractive layer and a second refractive layer disposed between the first refractive layer and the transparent substrate layer, and the refractive index of the first refractive layer is smaller than the refractive index of the second refractive layer.

[0013] In one embodiment, the reflective film further includes a first AF layer, and the first AF layer is disposed on a side of the anti-reflection layer away from the transparent substrate layer.

[0014] In one embodiment, the reflective film further includes a water and oxygen barrier layer, which is disposed on a side of the aluminum layer away from the diffusion barrier layer, and the water and oxygen barrier layer includes at least one of an inorganic oxide layer, an inorganic nitride layer, and an organic polymer layer.

[0015] In one embodiment, the reflective film further includes a second AF layer, and the second AF layer is disposed on a side of the water and oxygen barrier layer away from the aluminum layer.

[0016] A backlight module comprises a light source, a brightness enhancement component, a diffusion film, a light guide plate and the reflective film described in any of the above embodiments, wherein the diffusion film and the reflective film are respectively arranged on opposite sides of the light guide plate, the brightness enhancement component is arranged on the side of the diffusion film away from the light guide plate, and the light source is arranged on the side of the light guide plate.

[0017] Compared with traditional technologies, the above-mentioned reflective film and backlight module have the following beneficial effects:

[0018] The reflective film comprises a silver layer with high reflectivity on a transparent substrate layer, and an aluminum layer as a brightness compensation layer on the back of the silver layer. This allows the silver layer to be thinned while maintaining high reflectivity, thereby reducing costs. Furthermore, a diffusion barrier layer is provided between the silver and aluminum layers. The diffusion barrier layer comprises at least one of an aluminum oxide layer, a silicon dioxide layer, a titanium dioxide layer, an aluminum nitride layer, a silicon nitride layer, an ITO layer, an AZO layer, a GZO layer, an IZO layer, a ZTO layer, and a graphene layer. This prevents aluminum atoms from diffusing into the silver layer, thereby preventing a decrease in reflective efficiency.

[0019] The above-mentioned backlight source module includes the reflective film described in any of the above-mentioned embodiments, and thus has corresponding technical features and can obtain corresponding beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a reflective film according to an embodiment;

[0021] Figure 2 To include Figure 1 Schematic diagram of the structure of the backlight module with the reflective film shown.

[0022] Description of reference numerals:

[0023] 100. Reflective film; 101. Transparent substrate layer; 102. Silver layer; 103. Diffusion barrier layer; 104. Aluminum layer; 105. Primer layer; 106. Anti-reflection layer; 1061. First refractive layer; 1062. Second refractive layer; 109. First AF layer; 110. Water and oxygen barrier layer; 111. Second AF layer; 112. First inorganic anti-corrosion layer; 113. Second inorganic anti-corrosion layer; 200. Backlight module; 201. Light source; 202. Diffusion film; 203. Light guide plate; 204. Brightness enhancement component; 2041. Upper brightening film; 2042. Lower brightening film. DETAILED DESCRIPTION

[0024] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0028] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0029] like Figure 1 As shown, a reflective film 100 according to an embodiment of the present invention includes a transparent substrate layer 101, a silver layer 102, a diffusion barrier layer 103, and an aluminum layer 104, which are stacked in sequence. The diffusion barrier layer 103 includes at least one of an aluminum oxide layer, a silicon dioxide layer, a titanium dioxide layer, an aluminum nitride layer, a silicon nitride layer, an ITO (indium tin oxide) layer, an AZO (aluminum-doped zinc oxide) layer, a GZO (gallium-doped zinc oxide) layer, an IZO (indium zinc oxide) layer, a ZTO (zinc tin oxide) layer, and a graphene layer.

[0030] The reflective film 100 has a silver layer 102 on a transparent substrate layer 101, which has high reflectivity. An aluminum layer 104 is provided on the back of the silver layer 102 as a brightness compensation layer. The silver layer 102 can be thinned while maintaining high reflectivity to reduce costs.

[0031] However, placing an aluminum layer 104 behind the silver layer 102 causes the thin silver layer 102 to turn slightly pink, reducing reflection efficiency. The inventors of the present invention have discovered through research that the diffusion of aluminum atoms from the aluminum layer 104 into the thin silver layer 102 causes the silver layer 102 to turn pink and reduce reflection efficiency.

[0032] The reflective film 100 is provided with a diffusion barrier layer 103 between the silver layer 102 and the aluminum layer 104. The diffusion barrier layer 103 includes at least one layer selected from the group consisting of an aluminum oxide layer, a silicon dioxide layer, a titanium dioxide layer, an aluminum nitride layer, a silicon nitride layer, an ITO layer, an AZO layer, a GZO layer, an IZO layer, a ZTO layer, and a graphene layer. This prevents aluminum atoms from diffusing into the silver layer 102, thereby avoiding a decrease in reflection efficiency.

[0033] In some examples, transparent substrate layer 101 is a polymer layer. Furthermore, transparent substrate layer 101 is a PET layer. In some examples, transparent substrate layer 101 has a thickness of 20µm to 100µm, specifically 20µm, 40µm, 60µm, 80µm, 100µm, etc. In some examples, transparent substrate layer 101 has a light transmittance of 88% to 91%, specifically 88%, 88.5%, 89%, 89.5%, 90%, 90.5%, 91%, etc.

[0034] In some examples, the thickness of the silver layer 102 is 50 nm to 100 nm, specifically 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm, etc.

[0035] The thickness of the diffusion barrier layer 103 should be controlled within a certain range. If the diffusion barrier layer 103 is too thin, it will not effectively prevent aluminum atoms from diffusing into the silver layer 102. If the diffusion barrier layer 103 is too thick, it will not be conducive to further improving the reflectivity, and may even reduce the reflectivity, and it will not be conducive to reducing costs. For example, in some examples, the thickness of the diffusion barrier layer 103 is 2nm to 10nm, specifically 2nm, 3nm, 4nm, 5nm, 6nm, 7nm, 8nm, 9nm, 10nm, etc.

[0036] In some examples, the thickness of the aluminum layer 104 is 20 nm to 60 nm, specifically 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, etc.

[0037] By combining the silver layer 102 , the diffusion barrier layer 103 and the aluminum layer 104 with the above thickness, the reflective film 100 has the advantages of high reflectivity and low cost.

[0038] The silver layer 102 can be prepared by a magnetron sputtering process, for example, the process is as follows: first, the cavity is evacuated to 2×10 -5 Pa~8×10 -5 Pa, Ar is introduced at 20 sccm~100 sccm, direct current (DC) mode is adopted, the working gas pressure is 0.1Pa~1Pa, and the power is 10W~40W.

[0039] The diffusion barrier layer 103 can be prepared by a magnetron sputtering process, for example, the process is as follows: first, the cavity is evacuated to 2×10 - 5 Pa~8×10 -5 Pa, Ar is introduced at a rate of 20 sccm~100 sccm, and the working gas pressure is 0.1 Pa~1 Pa. For insulating materials, the radio frequency (RF) mode is used with a power of 20W~40W; for conductive materials, the DC mode is used with a power of 10W~30W.

[0040] The aluminum layer 104 can be prepared by a magnetron sputtering process, for example, the process is as follows: first, the cavity is evacuated to 2×10 -5 Pa~8×10 -5 Pa, Ar is introduced at 20 sccm~100 sccm, DC mode is adopted, the working gas pressure is 0.1Pa~1Pa, and the power is 10W~40W.

[0041] In some examples, the reflective film 100 further includes a primer layer 105. The primer layer 105 is disposed between the transparent substrate layer 101 and the silver layer 102.

[0042] In some examples, the primer layer 105 includes at least one of a polyurethane layer, an acrylic layer, and a cyclic olefin copolymer layer. Thus, the primer layer 105 can improve the connection between the transparent substrate layer 101 and the silver layer 102 while also providing a certain degree of isolation from water and oxygen.

[0043] In some examples, the thickness of the primer layer 105 is 0.5µm to 2µm, for example, 0.5µm, 1µm, 1.5µm, 2µm, etc.

[0044] In some examples, the reflective film 100 further includes an anti-reflection layer 106 . The anti-reflection layer 106 is disposed on a side of the transparent substrate layer 101 away from the silver layer 102 .

[0045] In some examples, the anti-reflection layer 106 includes a first refractive layer 1061 and a second refractive layer 1062 disposed between the first refractive layer 1061 and the transparent substrate layer 101. The refractive index of the first refractive layer 1061 is less than that of the second refractive layer 1062.

[0046] Optionally, the refractive index of the first refractive layer 1061 is, for example, 1.4 to 1.8, and the material thereof is, for example, but not limited to, at least one of SiO2, MgF2, and Al2O3. The refractive index of the second refractive layer 1062 is, for example, 1.9 to 2.4, and the material thereof is, for example, but not limited to, at least one of TiO2, ZrO, HfO2, ZnO, Ta2O5, CeO2, ZnS, Si3N4, and Nb2O5.

[0047] In some examples, the thickness of the first refractive layer 1061 is 110 nm to 150 nm, specifically 110 nm, 120 nm, 130 nm, 140 nm, 150 nm, etc. In some examples, the thickness of the second refractive layer 1062 is 110 nm to 150 nm, specifically 110 nm, 120 nm, 130 nm, 140 nm, 150 nm, etc.

[0048] The first refractive layer 1061 and the second refractive layer 1062 can be prepared by a magnetron sputtering process, for example, the process is as follows: first, the cavity is evacuated to 2×10-5 Pa~8×10 -5 Pa, Ar is introduced at 20 sccm~100 sccm, RF mode is adopted, the working gas pressure is 0.1Pa~1Pa, and the power is 20W~60W.

[0049] The first refractive layer 1061 and the second refractive layer 1062 may each be provided with multiple layers, which are repeatedly and alternately stacked to better achieve an anti-reflection effect, increase the transmittance of light passing through the transparent substrate layer 101, and further improve the reflectivity.

[0050] In some examples, the reflective film 100 further includes a first AF layer 109. The first AF layer 109 is disposed on the side of the anti-reflective layer 106 away from the transparent substrate layer 101. The first AF layer 109 has low surface energy and high hardness, and can provide anti-fingerprint and scratch resistance, thereby preventing the reflective film 100 from being damaged during manufacturing, transportation, and assembly, which would otherwise reduce the reflective performance of the product.

[0051] The first AF layer 109 is formed by applying an AF coating solution and drying it. The AF coating solution contains 40% to 65% by weight of an acrylic resin prepolymer, 10% to 15% by weight of an acrylate monomer, 1% to 5% by weight of an initiator, 0.5% to 1.5% by weight of a fluorine-containing additive, and 23% to 48% by weight of a solvent. Examples of the acrylic resin prepolymer include trifunctional urethane acrylic resin prepolymers and hexafunctional urethane acrylic resin prepolymers. Examples of the acrylate monomer include trifunctional acrylate monomers. Examples of the initiator include Irgacure 184. Examples of the fluorine-containing additive include fluorocarbon cyclic ethers, fluoroalkanes, fluorosilicones, and perfluoropolyethers. Examples of the solvent include ethyl acetate.

[0052] In some examples, the refractive index of the first AF layer 109 is 1.2-1.4, specifically 1.2, 1.25, 1.3, 1.35, 1.4, etc.

[0053] In some examples, the reflective film 100 further includes a water and oxygen barrier layer 110. The water and oxygen barrier layer 110 is disposed on a side of the aluminum layer 104 away from the diffusion barrier layer 103. The water and oxygen barrier layer 110 includes at least one of an inorganic oxide layer, an inorganic nitride layer, and an organic polymer layer.

[0054] The material of the inorganic oxide layer may be, but is not limited to, at least one of Al2O3, SiO2, TiO2, and Ta2O5. The material of the inorganic nitride layer may be, but is not limited to, at least one of AlN and Si3N4. The material of the organic polymer layer may be, but is not limited to, at least one of polyurethane, acrylic, and cycloolefin copolymer.

[0055] When the water and oxygen barrier layer 110 is an inorganic oxide layer or an inorganic nitride layer, the thickness is, for example, 10 nm to 50 nm, specifically 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, etc. The inorganic oxide layer and the inorganic nitride layer can be prepared by a magnetron sputtering process, for example, the process is as follows: first, the chamber is evacuated to 2×10 -5 Pa~8×10 -5 Pa, Ar is introduced at 20 sccm~100 sccm, RF mode is adopted, the working gas pressure is 0.1Pa~1Pa, and the power is 20W~55W.

[0056] When the water and oxygen barrier layer 110 is an organic polymer layer, the thickness is, for example, 0.5 μm to 2 μm, specifically, 0.5 μm, 1 μm, 1.5 μm, 2 μm, etc. The organic polymer layer can be formed by coating a polymer and curing it.

[0057] In some examples, the reflective film 100 further includes a second AF layer 111. The second AF layer 111 is disposed on a side of the water and oxygen barrier layer 110 away from the aluminum layer 104. The second AF layer 111 has low surface energy and high hardness, and can provide anti-fingerprint and scratch resistance, thereby preventing the reflective film 100 from being damaged during manufacturing, transportation, and assembly.

[0058] The second AF layer 111 is formed by coating an AF coating liquid and drying the coating liquid. The composition of the second AF layer 111 may refer to the AF coating liquid in the first AF layer 109 .

[0059] In some examples, a first inorganic anti-corrosion layer 112 is disposed around the periphery of the silver layer 102. The material of the first inorganic anti-corrosion layer 112 may be, but is not limited to, at least one of Al2O3, SiO2, TiO2, Ta2O5, Si3N4, and ITO. The width of a single side of the first inorganic anti-corrosion layer 112 is, for example, 1 / 8 the width of the silver layer 102.

[0060] In some examples, a second inorganic anti-corrosion layer 113 is disposed around the periphery of the aluminum layer 104. The material of the second inorganic anti-corrosion layer 113 may be, but is not limited to, at least one of Al2O3, SiO2, TiO2, Ta2O5, Si3N4, and ITO. The width of a single side of the second inorganic anti-corrosion layer 113 is, for example, 1 / 8 the width of the aluminum layer 104.

[0061] The first inorganic anti-corrosion layer 112 and the second inorganic anti-corrosion layer 113 can be prepared by a magnetron sputtering process, which is implemented in the form of a multi-segment target. For example, the process is as follows: first, the cavity is evacuated to 2×10 -5 Pa~8×10 -5Pa, Ar is introduced at 20sccm~100sccm, the working gas pressure is 0.1Pa~1Pa, the conductive target position adopts DC mode with a power of 10W~40W, and the insulating target position uses RF power with a power of 20W~60W.

[0062] The reflective film 100 comprises a silver layer 102 with high reflectivity on a transparent substrate layer 101. An aluminum layer 104 is disposed on the back of the silver layer 102 as a brightness compensation layer. This allows the silver layer 102 to be thinned while maintaining high reflectivity, thereby reducing costs. Furthermore, a diffusion barrier layer 103 is provided between the silver layer 102 and the aluminum layer 104. The diffusion barrier layer 103 comprises at least one of an aluminum oxide layer, a silicon dioxide layer, a titanium dioxide layer, an aluminum nitride layer, a silicon nitride layer, an ITO layer, an AZO layer, a GZO layer, an IZO layer, a ZTO layer, and a graphene layer. This prevents aluminum atoms from diffusing into the silver layer 102, thereby preventing a decrease in reflective efficiency.

[0063] Further, if Figure 2 As shown, the present invention further provides a backlight module 200, comprising a light source 201, a diffusion film 202, a light guide plate 203, and any of the above-described reflective films 100. The diffusion film 202 and the reflective film 100 are disposed on opposite sides of the light guide plate 203, and the light source 201 is disposed on the side of the light guide plate 203.

[0064] The light source 201 is, for example, an LED.

[0065] The diffusion film 202 can improve the brightness uniformity of the entire backlight surface by scattering light, making the light more uniform and soft, and reducing the brightness and darkness differences caused by problems such as uneven light output from the light guide plate 203 or the light emitting angle of the light source 201.

[0066] In some examples, the backlight module 200 further includes a brightness enhancement component 204, which is disposed on a side of the diffusion film 202 away from the light guide plate 203. The surface of the brightness enhancement component 204 has many tiny prism structures that can focus and direct light forward, thereby increasing the vertical brightness of the backlight module 200, thereby enhancing the display effect, reducing light scattering in the horizontal direction, and improving light utilization efficiency.

[0067] In some examples, the brightness enhancement component 204 includes an upper brightness enhancement film 2041 and a lower brightness enhancement film 2042. The lower brightness enhancement film 2042 is located between the upper brightness enhancement film 2041 and the diffuser film 202. The lower brightness enhancement film 2042 initially converges and redirects light passing through the diffuser film 202. The upper brightness enhancement film 2041 further performs secondary focusing and optimizes light uniformity, thereby achieving progressive light convergence and ultimately achieving a balance between brightness, power, and uniformity.

[0068] The following specific embodiments are provided to further illustrate the present invention. The present invention provides the following specific embodiments for a better understanding of the present invention, but is not limited to the specific embodiments and does not limit the scope of protection of the present invention.

[0069] Example 1

[0070] The reflective film 100 provided in this embodiment includes a first AF layer 109, a first refractive layer 1061, a second refractive layer 1062, a transparent substrate layer 101, a primer layer 105, a silver layer 102, a diffusion barrier layer 103, an aluminum layer 104, a water and oxygen barrier layer 110, and a second AF layer 111, which are stacked in sequence.

[0071] The first AF layer 109 is formed by applying an AF coating solution and then drying it. The AF coating solution consists of 45% by weight of a hexafunctional urethane acrylic resin prepolymer, 12% of a trifunctional acrylate monomer, 2% of an Irgacure 184 initiator, 1% of a pentafluorocarbon cyclic ether, and 40% of ethyl acetate. The thickness of the first AF layer 109 is 2µm. The second AF layer 111 is made of the same materials and has the same thickness as the first AF layer 109.

[0072] The material of the first refractive layer 1061 is SiO 2 , and the thickness is 120 nm.

[0073] The second refractive layer 1062 is made of Nb 2 O 5 and has a thickness of 120 nm.

[0074] The transparent substrate layer 101 is made of PET and has a thickness of 25 μm.

[0075] The base coating 105 is made of polyurethane and has a thickness of 1 μm.

[0076] The thickness of the silver layer 102 is 80 nm.

[0077] The diffusion barrier layer 103 is made of aluminum oxide and has a thickness of 8 nm.

[0078] The thickness of the aluminum layer 104 is 50 nm.

[0079] The material of the water and oxygen barrier layer 110 is Si 3 N 4 , and the thickness is 40 nm.

[0080] Example 2

[0081] The only difference between this embodiment and embodiment 1 is that the thickness of the diffusion barrier layer 103 is 5 nm.

[0082] Example 3

[0083] The only difference between this embodiment and embodiment 1 is that the thickness of the diffusion barrier layer 103 is 10 nm.

[0084] Example 4

[0085] The only difference between this embodiment and embodiment 1 is that the material of the diffusion barrier layer 103 is titanium dioxide.

[0086] Example 5

[0087] The only difference between this embodiment and embodiment 1 is that the material of the diffusion barrier layer 103 is silicon nitride.

[0088] Example 6

[0089] The only difference between this embodiment and embodiment 1 is that the material of the diffusion barrier layer 103 is ITO.

[0090] Example 7

[0091] The only difference between this embodiment and embodiment 1 is that the diffusion barrier layer 103 is made of graphene and has a thickness of 2 nm.

[0092] Comparative Example 1

[0093] The only difference between this comparative example and Example 1 is that no diffusion barrier layer is provided.

[0094] The reflective films of the above embodiments and comparative examples were stored in an environment with a temperature of 25±2° C. and a relative humidity of 45±5% for 15 days, and then the brightness and reflectivity were tested.

[0095] Table 1 Brightness and reflectivity of the reflective films of various embodiments and comparative examples after storage for 15 days

[0096]

[0097] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be based on the appended claims, and the specification may be used to interpret the content of the claims.

Claims

1. A reflective film, characterized in that: The invention comprises a transparent substrate layer, a silver layer, a diffusion barrier layer and an aluminum layer stacked in sequence, wherein the diffusion barrier layer comprises at least one layer selected from the group consisting of an aluminum oxide layer, a silicon dioxide layer, a titanium dioxide layer, an aluminum nitride layer, a silicon nitride layer, an ITO layer, an AZO layer, a GZO layer, an IZO layer, a ZTO layer and a graphene layer.

2. The reflective film according to claim 1, wherein The thickness of the silver layer is 50 nm to 100 nm, the thickness of the diffusion barrier layer is 2 nm to 10 nm, and the thickness of the aluminum layer is 20 nm to 60 nm.

3. The reflective film according to claim 1, wherein The reflective film meets one of the following characteristics (1) to (2): (1) The reflective film further includes a primer layer, which is disposed between the transparent substrate layer and the silver layer, and the primer layer includes at least one layer selected from the group consisting of a polyurethane layer, an acrylic layer, and a cycloolefin copolymer layer; (2) The transparent substrate layer is a polymer layer.

4. The reflective film according to claim 1, wherein The reflective film meets one of the following characteristics (1) to (2): (1) A first inorganic anti-corrosion layer is provided on the periphery of the silver layer; (2) A second inorganic anti-corrosion layer is provided on the periphery of the aluminum layer.

5. The reflective film according to any one of claims 1 to 4, wherein The reflective film further includes an anti-reflection layer, and the anti-reflection layer is arranged on a side of the transparent substrate layer away from the silver layer.

6. The reflective film according to claim 5, wherein The anti-reflection layer includes a first refractive layer and a second refractive layer disposed between the first refractive layer and the transparent substrate layer. The refractive index of the first refractive layer is smaller than that of the second refractive layer.

7. The reflective film according to claim 5, wherein The reflective film further includes a first AF layer, which is disposed on a side of the anti-reflection layer away from the transparent substrate layer.

8. The reflective film according to claim 1, wherein The reflective film further includes a water and oxygen barrier layer, which is arranged on a side of the aluminum layer away from the diffusion barrier layer. The water and oxygen barrier layer includes at least one of an inorganic oxide layer, an inorganic nitride layer, and an organic polymer layer.

9. The reflective film according to claim 8, wherein The reflective film further includes a second AF layer, which is disposed on a side of the water and oxygen barrier layer away from the aluminum layer.

10. A backlight module, characterized in that: The invention comprises a light source, a brightness enhancement component, a diffusion film, a light guide plate and a reflective film according to any one of claims 1 to 9, wherein the diffusion film and the reflective film are respectively arranged on opposite sides of the light guide plate, the brightness enhancement component is arranged on a side of the diffusion film away from the light guide plate, and the light source is arranged on the side of the light guide plate.

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