Large viewing angle low reflection film

Abstract

The application discloses a large-viewing-angle low-reflection film, which comprises a substrate layer, a low-reflection coating layer arranged on one side of the substrate layer, the low-reflection coating layer comprising a plurality of high-refraction coating layers arranged in a stack and a low-reflection coating layer arranged between adjacent high-refraction coating layers, and a low-reflection resin layer arranged on the side of the low-reflection coating layer away from the substrate layer, the low-reflection resin layer having a refractive index of 1.3-1.4 and comprising uniformly dispersed fluorine-containing polymers. The large-viewing-angle low-reflection film is applied to an automobile sunroof, and the reflectivity at an incident angle of 62° is as low as 4.31%, which is reduced by 58% and 43% respectively relative to an automobile sunroof without the film and an automobile sunroof with a conventional low-reflection film, and the passenger privacy can be significantly improved.

Description

Technical Field

[0001] This application belongs to the field of optical thin film technology, specifically relating to a wide-viewing-angle low-reflection thin film. Background Technology

[0002] A sunroof is a common roof opening in a car, usually made of highly reflective mirrored glass. This glass reflects light very strongly, often compromising privacy inside the vehicle. While driving, if a front or rear passenger accidentally turns their head towards the sunroof, they may be able to see the silhouette of another passenger or someone behind them. This affects passenger comfort and privacy, and for safety reasons, passengers need to remain alert and protect their privacy while driving.

[0003] To address this issue, some automakers have begun using privacy film technology to enhance window privacy and passenger safety. This involves applying a low-reflection film to the surface of the sunroof glass to reduce surface reflectivity and improve passenger privacy. Existing low-reflection films have a reflectivity of around 0.5% when light is incident perpendicularly, which is sufficient to prevent peeping. However, when applied to sunroofs, the reflectivity of existing low-reflection films increases significantly at large angles, as passengers' viewing angle is at a large angle to the sunroof's normal. At a 62° angle, the reflectivity of existing low-reflection films increases to around 10%, failing to guarantee passenger privacy. Summary of the Invention

[0004] The purpose of this application is to provide a low-reflection film with a wide viewing angle to solve the technical problem that the reflectivity of the existing low-reflection film increases significantly at a wide viewing angle. When applied to a car sunroof, the increased reflectivity due to the large angle between the passenger's viewing angle and the sunroof normal leads to a failure to guarantee passenger privacy.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] A wide-viewing-angle, low-reflection thin film is provided, comprising:

[0007] Substrate layer;

[0008] The low-reflection coating layer is prepared by magnetron sputtering. The low-reflection coating layer is disposed on one side of the substrate layer and includes a plurality of high-reflection coating layers stacked together and a low-reflection coating layer disposed between adjacent high-reflection coating layers.

[0009] The low-reflection resin layer is prepared by a coating process. The low-reflection resin layer is disposed on the side of the low-reflection coating layer opposite to the substrate layer. The refractive index of the low-reflection resin layer is 1.3-1.4, and the low-reflection resin layer comprises uniformly dispersed fluoropolymers.

[0010] The low-reflectivity film has an average reflectance of 4.2% to 4.8% for visible light incident at an angle of 60° to 65° from one side of the low-reflectivity resin layer.

[0011] In one or more embodiments, the high-refractive-index coating layer is a niobium pentoxide layer, and the low-refractive-index coating layer is a silicon dioxide layer.

[0012] In one or more embodiments, the low-reflection coating layer includes a first niobium pentoxide layer, a silicon dioxide layer, and a second niobium pentoxide layer sequentially stacked along a direction away from the substrate layer, wherein the thickness of the first niobium pentoxide layer is 10-15 nm, the thickness of the silicon dioxide layer is 40-50 nm, and the thickness of the second niobium pentoxide layer is 120-140 nm.

[0013] In one or more embodiments, the low-reflection resin layer further includes an acrylic resin; the low-reflection resin layer is obtained by coating and curing with a coating liquid, the coating liquid comprising the following components in parts by weight:

[0014] Fluoropolymer 20-30 parts; acrylic resin 20-30 parts; photoinitiator 1-5 parts; dispersant 1-5 parts; solvent 30-50 parts.

[0015] In one or more embodiments, the thickness of the low-reflectivity resin layer is 120–140 nm.

[0016] In one or more embodiments, the solvent includes one or a combination of several of methyl ethyl ketone, propylene glycol methyl ether, methyl isobutyl ketone, isopropanol, ethyl acetate, and toluene.

[0017] In one or more embodiments, the fluoropolymer includes one or more combinations of polyvinylidene fluoride, polyvinylidene fluoride, polytrifluoroethylene, and polytetrafluoroethylene.

[0018] In one or more embodiments, the substrate layer is a PET substrate layer.

[0019] In one or more embodiments, the thickness of the PET substrate layer is 50–125 μm, and / or the total light transmittance of the PET substrate layer is greater than 90%.

[0020] In one or more embodiments, the surface of the PET substrate layer is treated with corona discharge, plasma treatment, magnetron sputtering, silane coupling agent treatment, or surfactant treatment.

[0021] The advantages of this application, which differ from existing technologies, are:

[0022] The large-viewing-angle low-reflection film of this application has a low-reflection coating layer with alternating high and low refractive indices, and a low-reflection resin layer with a refractive index of 1.3 to 1.4. The thickness of each layer is controlled so that during the propagation of light waves, the reflected light waves and refracted light waves cancel each other out through the interference of the thin film reflection and transmission, thereby reducing the reflectivity. The low-reflection film can reduce the correlation between the incident angle and the reflectivity, so that the effect of low reflectivity can still be maintained under the condition of large-angle incident light.

[0023] The low-reflection resin layer of the large-view low-reflection film of this application includes a uniformly dispersed fluoropolymer. Fluorine organic compounds have excellent optical transparency, low reflectivity and chemical resistance. In addition, fluoroorganic compound molecules have high electronegativity, so when they interact with surface groups, they can form a tight chemical bond, providing strong surface wettability and surface lubrication, which plays a good role in reducing surface reflection. At the same time, fluoroorganic compounds also have excellent weather resistance and chemical resistance, and can stably maintain their original performance in complex working environments.

[0024] When the large-view low-reflection film of this application is applied to a car sunroof, the reflectivity is as low as 4.31% at an incident angle of 62°, which is 58% and 43% lower than that of an unfilmed car sunroof and a car sunroof with a traditional low-reflection film, respectively, thus significantly improving passenger privacy. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of one embodiment of the wide-viewing-angle low-reflection thin film of this application;

[0026] Figure 2 This is a reflectance test chart of an untinted car sunroof;

[0027] Figure 3 This is a reflectance test chart of the car sunroof after the low-reflection film of Comparative Example 2 has been applied.

[0028] Figure 4 This is a reflectance test chart of a car sunroof after the low-reflection film of Example 3 is applied.

[0029] As shown in the figure:

[0030] Substrate layer 100;

[0031] Low-reflection coating layer 200; first niobium pentoxide layer 201; silicon dioxide layer 202; second niobium pentoxide layer 203;

[0032] Low-reflection resin layer 300. Detailed Implementation

[0033] The present application will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present application, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present application.

[0034] A sunroof can provide a brighter and more spacious interior, further enhancing the comfort of passengers and the driver. Generally, to make passengers feel more ventilated inside the vehicle, sunroofs are usually tilted upwards or backwards, creating a smaller angle.

[0035] Furthermore, the installation location also affects the angle between the passenger and the sunroof. In some models, the sunroof is installed in the center of the vehicle, which may result in a smaller angle between the passenger and the sunroof. In other models, the sunroof is installed at the front or rear of the vehicle, which may result in a larger angle between the passenger and the sunroof.

[0036] Based on the average height of passengers and the height of the sunroof, the angle at which passengers typically look upwards is generally 20° to 30°. Therefore, the angle between the passenger's line of sight and the normal to the sunroof is approximately 60° to 70°, with an average of about 62°. This angle design allows passengers to have sufficient visibility and a comfortable sense of space when using the sunroof.

[0037] When light is incident perpendicularly, reflectivity refers to the ratio of the intensity of the reflected light to the intensity of the incident light when light travels from one medium to another. This is because when light is incident perpendicularly to the surface of a medium, refraction does not occur, and reflectivity is only affected by the interface reflection coefficient. The amplitude reflection coefficient of light at the interface between two media is (1-ρ) / (1+ρ), where ρ is the ratio of the refractive indices of the two media, and reflectivity is the square of the amplitude reflection coefficient, i.e., R = (n1-n2). 2 / (n1+n2) 2 In the formula, n1 and n2 are the refractive indices of the two media.

[0038] When light rays are incident at large angles, reflectivity is affected by many factors, such as the angle of incidence, the incident medium, and the reflecting medium. In this case, reflectivity is influenced by the relative intensity of reflection and refraction, and is no longer solely affected by the interface reflection coefficient. Furthermore, reflectivity is also related to the difference in refractive index between the incident and reflecting media; this phenomenon is called Fresnel refraction. Reflectivity at large angles can be calculated using Fresnel's formula. For a ray incident from medium 1 to medium 2, assuming an angle of incidence of θ1, an angle of refraction of θ2, and an angle of reflection of θr, its Fresnel reflection coefficient is:

[0039]

[0040] Where n1 and n2 are the refractive indices of medium 1 and medium 2, respectively. If the incident angle θ1 is large, the Fresnel reflection coefficient R may reach an extremely high value, close to 1, meaning that most of the light is reflected back. The average angle between the passenger's line of sight and the normal to the sunroof is 62°. At this angle, the reflectivity of the sunroof will increase significantly, causing passengers to be able to see directly into another passenger's seat or the figure of someone behind them through the sunroof. This will affect the passenger's comfort and privacy. Especially for safety reasons, passengers need to remain alert and protect their privacy while driving.

[0041] Currently, existing low-reflection films can only effectively reduce reflectivity when light is incident perpendicularly, with a reflectivity of around 0.5%, which can serve as a privacy feature. However, when applied to sunroofs, the reflectivity increases significantly due to the large angle between the passenger's line of sight and the sunroof's normal. At a 62° angle, the reflectivity of existing low-reflection films increases to around 10%, failing to guarantee passenger privacy.

[0042] To address the aforementioned issues, the applicant has developed a wide-viewing-angle low-reflection film that can be applied in wide-viewing-angle scenarios, such as on car sunroofs, to significantly reduce reflectivity and thus protect passenger privacy and safety.

[0043] Specifically, please refer to Figure 1 , Figure 1 This is a schematic diagram of one embodiment of the large-viewing-angle low-reflection thin film of this application.

[0044] like Figure 1 As shown, the low-reflection film includes a substrate layer 100, a low-reflection coating layer 200 and a low-reflection resin layer 300 arranged sequentially.

[0045] The substrate layer 100 can be made of a material with high light transmittance. In one embodiment, the substrate layer 100 can be made of PET material with a thickness of 50-125μm and a total light transmittance of more than 90%, thereby ensuring the light transmittance of the film and avoiding affecting the lighting effect of the skylight.

[0046] The low-reflection coating layer 200 includes a first niobium pentoxide layer 201, a silicon dioxide layer 202, and a second niobium pentoxide layer 203, which are sequentially stacked along the direction away from the substrate layer 100.

[0047] In one embodiment, the thickness of the first niobium pentoxide layer 201 can be 10-15 nm, the thickness of the silicon dioxide layer 202 can be 40-50 nm, and the thickness of the second niobium pentoxide layer 203 can be 120-140 nm.

[0048] Niobium pentoxide has a refractive index of around 2.5, while silicon dioxide has a refractive index of around 1.45. By alternatingly stacking a high-refractive-index first niobium pentoxide layer 201, a second niobium pentoxide layer 203, and a low-refractive-index silicon dioxide layer 202, and controlling the thickness of the three-layer structure, the reflectivity can be effectively reduced.

[0049] It should be noted that niobium pentoxide in the low-reflection coating layer 200 can also be replaced with other high-refractive-index metal oxide materials, and silicon dioxide in the low-reflection coating layer 200 can also be replaced with other low-refractive-index materials. Adjusting the thickness of each layer based on actual selection can also achieve the effect of this embodiment.

[0050] In addition, the low-reflection coating layer 200 is not limited to a three-layer structure. Specifically, the low-reflection coating layer 200 may include any number of high-reflection coating layers, such as 3 or 4 layers, and include low-reflection coating layers arranged between adjacent high-reflection coating layers, which can also achieve the effect of this embodiment. It can be selected and adjusted based on actual working conditions.

[0051] In one embodiment, the low-reflection coating layer 200 can be deposited on the surface of the substrate layer by magnetron sputtering. In order to improve the adhesion between the PET substrate and the low-reflection coating layer 200, the surface of the PET substrate can also be subjected to corona treatment, plasma treatment, magnetron sputtering treatment, silane coupling agent treatment or surfactant treatment.

[0052] The low-reflection resin layer 300 has a refractive index of 1.3 to 1.4, and a fluoropolymer is uniformly dispersed within the low-reflection resin layer 300. In one embodiment, the fluoropolymer may include one or more combinations of polyvinylidene fluoride, polyvinylidene fluoride, polytrifluoroethylene, and polytetrafluoroethylene.

[0053] Fluorinated organic compounds possess excellent optical transparency, low reflectivity, and chemical resistance. Furthermore, the high electronegativity of fluorinated organic compound molecules allows them to form tight chemical bonds with surface groups, providing strong surface wettability and lubrication, which effectively reduces surface reflection. Simultaneously, fluorinated organic compounds exhibit excellent weather resistance and chemical resistance, maintaining their original performance stably under complex working environments.

[0054] Since fluoropolymers have poor adhesion to the substrate, the low-reflection coating layer 200 located between the low-reflection resin layer 300 and the substrate layer 100 can effectively improve the adhesion of the low-reflection resin layer and enhance structural stability.

[0055] Specifically, the low-reflection resin layer 300 also includes an acrylic resin, in which a fluoropolymer can be uniformly dispersed to adhere to the low-reflection coating layer.

[0056] In one embodiment, the low-reflection resin layer 300 can be obtained by coating with a coating liquid, which may include the following components in parts by weight:

[0057] Fluoropolymer 20-30 parts; acrylic resin 20-30 parts; photoinitiator 1-5 parts; dispersant 1-5 parts; solvent 30-50 parts.

[0058] In one embodiment, the solvent may include one or a combination of several of methyl ethyl ketone, propylene glycol methyl ether, methyl isobutyl ketone, isopropanol, ethyl acetate, and toluene.

[0059] Understandably, the dispersing effect of the dispersant can fully disperse the fluoropolymer and acrylic resin in the solvent. After coating, the polymerization reaction occurs under the initiation of the photoinitiator. After curing, a low-reflection resin layer 300 with fluoropolymer uniformly dispersed can be obtained.

[0060] The above embodiment, by sequentially stacking a first niobium pentoxide layer 201, a silicon dioxide layer 202, a second niobium pentoxide layer 203, and a low-reflection resin layer 300, and controlling the thickness of each layer, allows the reflected and refracted light waves to cancel each other out during light wave propagation through the interference of reflection and transmission of the thin film, thereby reducing reflectivity. This interference characteristic makes the low-reflection thin film of the above embodiment particularly suitable for use with large-angle incident light.

[0061] By adjusting the refractive index and thickness of the low-reflection film, the correlation between the incident angle and reflectivity can be reduced, so that the effect of low reflectivity can still be maintained even under large-angle incident light.

[0062] The beneficial effects of the technical solution of this application will be further explained in detail below with reference to specific embodiments.

[0063] Example 1:

[0064] A wide-viewing-angle low-reflection film includes a substrate layer, a low-reflection coating layer, and a low-reflection resin layer arranged in sequence.

[0065] The substrate layer is a PET substrate layer with a thickness of 50μm.

[0066] The low-reflection coating layer is deposited on the surface of the substrate layer using a magnetron sputtering process. It includes a first niobium pentoxide layer, a silicon dioxide layer, and a second niobium pentoxide layer arranged sequentially in a direction away from the substrate layer. The thickness of the first niobium pentoxide layer is 12 nm, the thickness of the silicon dioxide layer is 43 nm, and the thickness of the second niobium pentoxide layer is 127 nm.

[0067] The low-reflection resin layer is obtained by coating with a coating liquid with a coating thickness of 130 nm. The coating liquid includes the following components by weight: 20 parts polyvinylidene fluoride, 30 parts acrylic resin, 5 parts photoinitiator, 5 parts dispersant, and 40 parts of two solvents, methyl ethyl ketone and propylene glycol methyl ether.

[0068] Example 2:

[0069] A wide-viewing-angle low-reflection film includes a substrate layer, a low-reflection coating layer, and a low-reflection resin layer arranged in sequence.

[0070] The substrate layer is a 100μm thick PET substrate layer.

[0071] The low-reflection coating layer is deposited on the surface of the substrate layer using a magnetron sputtering process. It includes a first niobium pentoxide layer, a silicon dioxide layer, and a second niobium pentoxide layer arranged sequentially in a direction away from the substrate layer. The thickness of the first niobium pentoxide layer is 15 nm, the thickness of the silicon dioxide layer is 45 nm, and the thickness of the second niobium pentoxide layer is 120 nm.

[0072] The low-reflection resin layer is obtained by coating with a coating liquid with a coating thickness of 120 nm. The coating liquid includes the following components by weight: 25 parts polyvinyl fluoride, 20 parts acrylic resin, 5 parts photoinitiator, 5 parts dispersant, and 45 parts of two solvents, methyl ethyl ketone and propylene glycol methyl ether.

[0073] Example 3:

[0074] A wide-viewing-angle low-reflection film includes a substrate layer, a low-reflection coating layer, and a low-reflection resin layer arranged in sequence.

[0075] The substrate layer is a PET substrate layer with a thickness of 125μm.

[0076] The low-reflection coating layer is deposited on the surface of the substrate layer using a magnetron sputtering process. It includes a first niobium pentoxide layer, a silicon dioxide layer, and a second niobium pentoxide layer arranged sequentially in a direction away from the substrate layer. The thickness of the first niobium pentoxide layer is 10 nm, the thickness of the silicon dioxide layer is 50 nm, and the thickness of the second niobium pentoxide layer is 140 nm.

[0077] The low-reflection resin layer is obtained by coating with a coating liquid with a coating thickness of 140 nm. The coating liquid includes the following components by weight: 30 parts polytetrafluoroethylene (PETT), 30 parts acrylic resin, 5 parts photoinitiator, 5 parts dispersant, and 30 parts of two solvents, methyl ethyl ketone and propylene glycol methyl ether.

[0078] Comparative Example 1:

[0079] A low-reflection film includes a substrate layer and a low-reflection resin layer stacked together.

[0080] The substrate layer is a PET substrate layer with a thickness of 125μm.

[0081] The low-reflection resin layer is obtained by coating with a coating liquid with a coating thickness of 140 nm. The coating liquid includes the following components by weight: 30 parts polytetrafluoroethylene (PETT), 30 parts acrylic resin, 5 parts photoinitiator, 5 parts dispersant, and 30 parts of two solvents, methyl ethyl ketone and propylene glycol methyl ether.

[0082] Comparative Example 2:

[0083] A low-reflection thin film includes a substrate layer and a low-reflection coating layer arranged in a stacked manner.

[0084] The substrate layer is a PET substrate layer with a thickness of 125μm.

[0085] The low-reflection coating layer is deposited on the surface of the substrate layer using a magnetron sputtering process. It includes a first niobium pentoxide layer, a first silicon dioxide layer, a second niobium pentoxide layer, and a second silicon dioxide layer arranged sequentially in a direction away from the substrate layer. The thickness of the first niobium pentoxide layer is 10 nm, the thickness of the first silicon dioxide layer is 50 nm, the thickness of the second niobium pentoxide layer is 140 nm, and the thickness of the second silicon dioxide layer is 140 nm.

[0086] Example of effect 1:

[0087] The films of Examples 1 to 3 and Comparative Examples 1 to 2 were bonded to the glass of a car sunroof. The substrate layer of the film was bonded to the glass. A car sunroof without film was used as a blank example. The reflectance of the car sunroof for visible light with an incident angle of 62° and a wavelength of 400 to 700 nm incident from one side of the film was measured using a reflectance spectrometer. The data in the table below are obtained.

[0088] reflectivity 4.31％ 4.57％ 4.78％ 6.16％ 10.58％ 10.31％

[0089] As shown in the table above, the reflectivity of the low-reflection films of Examples 1 to 3 at an incident angle of 62° is much lower than that of Comparative Example 1, Comparative Example 2 and the blank example. The reflectivity of the low-reflection film of Example 1 at an incident angle of 62° is only 4.31%, which is 30% lower than that of Comparative Example 1, 59% lower than that of the conventional low-reflection film of Comparative Example 2, and 58% lower than that of the blank example without film.

[0090] As can be seen from the above, the low-reflection films of Examples 1 to 3 can significantly reduce the reflectivity of the sunroof when applied to automotive sunroofs, thereby protecting the privacy of passengers.

[0091] Compared with Example 3, Comparative Example 1 and Comparative Example 2, the low-reflection films of Comparative Example 1 and Comparative Example 2 have much higher reflectivity at an incident angle of 62° than those of Example 3. Comparative Example 1 has the same low-reflection resin layer as Example 3 only on one side of the substrate. Comparative Example 3 replaces the low-reflection resin layer of Example 3 with a silicon dioxide layer of the same thickness as Example 3. The reflectivity of Comparative Example 1 is higher than that of Example 3 and lower than that of Comparative Example 2.

[0092] Therefore, the data above shows that there is a synergistic effect between the low-reflection coating layer and the low-reflection resin layer. Under the synergistic effect of the low-reflection coating layer and the low-reflection resin layer, the reflectivity of visible light at a wide viewing angle can be reduced.

[0093] Example of effect 2:

[0094] The films of Example 3 and Comparative Example 2 were laminated onto the glass of an automobile sunroof. The substrate layer of the film was laminated to the glass. A sunroof without the film laminated was used as a blank example. The reflectance of the sunroof for light incident at an angle of 62° and with a wavelength of 380–780 nm incident from one side of the film was measured using a reflectance spectrometer. Figures 2 to 4 .

[0095] in, Figure 2 This is a reflectance test chart of an untinted car sunroof. Figure 3 This is a reflectance test chart of the car sunroof after the low-reflection film of Comparative Example 2 has been applied. Figure 4 This is a reflectance test chart of a car sunroof after the low-reflection film of Example 3 is applied.

[0096] like Figure 2 Untinted sunroofs have a high reflectivity at an incident angle of 62°. The reflection is mainly caused by the reflection from the glass surface at a 62° angle. The refractive index of glass is usually around 1.5, and its reflectivity R = 10.31%, which is very high. Passengers can easily see other passengers when looking up at the sunroof, resulting in poor privacy.

[0097] like Figure 3 After applying the traditional low-reflection film of Comparative Example 2, the reflectivity of the car sunroof is R = 1.1% when light is incident perpendicularly, but the reflectivity reaches R = 10.58% when the incident angle is 62°. The traditional low-reflection film cannot effectively reduce the reflectivity at a wide viewing angle.

[0098] like Figure 4After the low-reflection film of Example 3 was applied, the reflectivity of the car sunroof was significantly reduced at an incident angle of 62°, with an average reflectivity R = 4.31%. This is mainly because the low-reflection film of Example 3 replaced the second silicon dioxide layer of Comparative Example 3 with a low-reflection resin layer. The low-reflection coating has a lower refractive index than the silicon dioxide layer. By applying an appropriate thickness and matching it with the low-reflection coating layer, the effect of reducing the reflectivity at a large viewing angle can be achieved.

[0099] The foregoing description of this disclosure is provided to enable any person skilled in the art to implement or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles applicable herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but is consistent with the widest scope of the principles and novel features disclosed herein.

Claims

1. A wide-viewing-angle low-reflection thin film, characterized in that, include: Substrate layer; The low-reflection coating layer is prepared by magnetron sputtering. The low-reflection coating layer is disposed on one side of the substrate layer and includes a plurality of high-reflection coating layers stacked together and a low-reflection coating layer disposed between adjacent high-reflection coating layers. A low-reflection resin layer is prepared by a coating process. The low-reflection resin layer is disposed on the side of the low-reflection coating layer opposite to the substrate layer. The refractive index of the low-reflection resin layer is 1.3~1.4, and the low-reflection resin layer comprises a uniformly dispersed fluoropolymer and an acrylic resin. The low-reflection resin layer is obtained by coating and curing with a coating liquid, which comprises the following components by weight: 20~30 parts of fluoropolymer; 20~30 parts of acrylic resin; 1~5 parts of photoinitiator; 1~5 parts of dispersant; and 30~50 parts of solvent. The thickness of the low-reflection resin layer is 120~140 nm. The low-reflectivity film has an average reflectance of 4.2% to 4.8% for visible light incident at an angle of 60° to 65° from one side of the low-reflectivity resin layer.

2. The wide-viewing-angle low-reflection thin film according to claim 1, characterized in that, The high-refractive-index coating layer is a niobium pentoxide layer, and the low-refractive-index coating layer is a silicon dioxide layer.

3. The wide-viewing-angle low-reflection thin film according to claim 2, characterized in that, The low-reflection coating layer includes a first niobium pentoxide layer, a silicon dioxide layer, and a second niobium pentoxide layer stacked sequentially in a direction away from the substrate layer. The thickness of the first niobium pentoxide layer is 10-15 nm, the thickness of the silicon dioxide layer is 40-50 nm, and the thickness of the second niobium pentoxide layer is 120-140 nm.

4. The wide-viewing-angle low-reflection thin film according to claim 1, characterized in that, The solvent includes one or a combination of several of methyl ethyl ketone, propylene glycol methyl ether, methyl isobutyl ketone, isopropanol, ethyl acetate, and toluene.

5. The wide-viewing-angle low-reflection thin film according to claim 1, characterized in that, The fluoropolymer includes one or more combinations of polyvinylidene fluoride, polyvinylidene fluoride, polytrifluoroethylene, and polytetrafluoroethylene.

6. The wide-viewing-angle low-reflection thin film according to claim 1, characterized in that, The substrate layer is a PET substrate layer.

7. The wide-viewing-angle low-reflection thin film according to claim 6, characterized in that, The thickness of the PET substrate layer is 50~125μm, and / or the total light transmittance of the PET substrate layer is greater than 90%.

8. The wide-viewing-angle low-reflection thin film according to claim 6, characterized in that, The surface of the PET substrate layer is treated with corona treatment, plasma treatment, magnetron sputtering treatment, silane coupling agent treatment, or surfactant treatment.

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