Functional optical filtering film for AR glasses and preparation method of functional optical filtering film

Abstract

The invention relates to a functional optical filtering film for AR glasses and a preparation method of the functional optical filtering film, and belongs to the technical field of optical lenses. The thin film is of a multi-layer composite structure and sequentially comprises a thin film base material, a light filtering layer 1, a light filtering layer 2, a protective layer, a hard reinforced coating, an antireflection film layer and an outer layer cross-linked structure. Wherein the light filtering layer 1 comprises low-polymerization organic silicon resin and coloring dye, and plays roles in fixing light filtering and enhancing adhesion; the light filtering layer 2 is a light response color changing layer and comprises light response color changing substances, and the color and the light transmittance can be automatically adjusted according to ambient light. The visible light transmittance of the film in a non-color-changing state can be adjusted within the range of 10%-95%, the transmittance after coloring can be reduced to 5% or below, and wide-range and self-adaptive optical regulation and control are achieved. The thin film does not need an external power supply and a driving circuit, has the advantages of light and thin structure, low power consumption, long service life and the like, and meanwhile, the wear resistance, the scratch resistance and the durability are improved through the design of the composite coating.

Description

Technical Field

[0001] This invention belongs to the field of optical lens technology and relates to a functional optical filter film for AR glasses and its preparation method. Background Technology

[0002] With the popularization of augmented reality (AR) technology and the continuous development of artificial intelligence (AI), AR glasses, as an important AI carrier, have gradually been applied in the market. Currently, AR glasses on the market are typically equipped with one or more sensors and cameras for collecting external information. When used outdoors, they are easily affected by direct sunlight, impacting their normal operation. Furthermore, during the process of projecting visual images onto the lenses using waveguide technology, strong external light can easily cause problems such as blurred image display and reduced contrast.

[0003] To address the aforementioned strong light interference, a common solution is to add an electrochromic film to the outside of the device for light blocking. However, this solution has significant limitations: the electrochromic film requires wiring and is relatively thick, making it difficult to fit the smaller sensor front end; furthermore, its addition increases the overall size and weight of the glasses, affecting wearing comfort.

[0004] Furthermore, most commercially available optical filter films employ an ABA three-layer sandwich structure, such as fixing a PVC film between two TAC films using adhesive, forming a laminate similar to a polarizing film. While this type of film has a simple manufacturing process, it suffers from poor aging resistance, is prone to delamination and bubbles, and faces significant limitations in further developing its optical properties.

[0005] Therefore, there is an urgent need to develop a functional optical filter film for AR glasses and its preparation method. Summary of the Invention

[0006] The purpose of this invention is to provide a functional optical filter film for AR glasses and a method for preparing the same. The functional optical filter film prepared by this invention is thin and lightweight. While possessing color-changing and fading performance comparable to high-quality photochromic lenses on the market, it also has superior optical performance, aging resistance and mechanical strength compared to existing photochromic film products.

[0007] A functional optical filter film for AR glasses, comprising, from bottom to top, a film substrate, a filter layer 1, a filter layer 2, a protective layer, a hard-reinforcing coating, an anti-reflective coating layer, and an outer cross-linked structure.

[0008] As a preferred embodiment of the present invention, the material of the thin film substrate is one or more of polycarbonate (PC), polyurethane, and polymethyl methacrylate (PMMA), or any one of glass and transparent ceramic; the thickness of the thin film substrate is 0.1~0.5μm; the shape of the thin film substrate is any one of circular, elliptical, capsule-shaped, square, or irregular shape adapted to eyeglasses.

[0009] As a preferred embodiment of the present invention, the filter layer 1 is composed of low-polymer silicone resin, solvent and coloring dye; The low-polymer silicone resin is a high-methyl content silicone resin containing Si-O bonds, specifically a combination of 3-aminopropyltriethoxysilane and 3-glycidyl etheroxypropyltrimethylsilane. The coloring dye is an organic dye and / or an inorganic dye, wherein the inorganic dye is one or two of high carbon black pigment and nano aluminum silicate pigment; and the organic dye is one or more of azo dye, anthraquinone dye, and triarylmethane dye. The content of the coloring dye in the filter layer is 5% to 10% of the total mass of the filter layer; The thickness of the filter layer is 5 μm to 10 μm.

[0010] As a preferred embodiment of the present invention, the filter layer 2 is a photoresponsive coloring layer, which comprises: (a) Resins, including but not limited to one or more of thermosetting acrylic resins, isobutyl acetate, and isocyanate resins; (b) Solvents, including but not limited to one or more of cyclohexanone, xylene, N-methylpyrrolidone, and N,N-dimethylformamide; (c) Photosensitive color-changing substances, including but not limited to one or more of spiroxazine compounds, spiropyran compounds, and succinic anhydride compounds; The thickness of the photoresponsive coloring layer is 5 μm to 30 μm; The visible light transmittance of the film when the photoresponsive coloring layer is in the colored state is 10%~70%.

[0011] As a preferred embodiment of the present invention, the protective layer is formed of a photocurable epoxy resin containing a photoinitiator, and the thickness of the protective layer is 10 μm to 20 μm.

[0012] As a preferred technical solution of the present invention, the hard-reinforcing coating formulation is as follows, calculated by weight percentage: 20-25% organosiloxane resin, 5-10% methanol, 14-28% ethanol, 1-4% diacetone alcohol, 35-40% ethylene glycol butyl ether, 2-3% inorganic nanocomposite particles, and the balance being deionized water; the thickness of the hard-reinforcing coating is 2 μm-4 μm. The preparation method of the inorganic nanocomposite particles is as follows: α-alumina nanoparticles were dispersed in an ethanol solution with a mass fraction of 85-95%. Ammonia and tetraethyl orthosilicate were added dropwise under stirring, wherein the mass ratio of α-alumina nanoparticles to tetraethyl orthosilicate was 1:(0.1-0.5), and the molar ratio of ammonia to tetraethyl orthosilicate was (2-4):1. The mixture was stirred at room temperature for 4-8 h, centrifuged, washed, dried, and then resuspended in an ethanol solution. 1%-2% of the particle mass of silane coupling agent KH560 was added, and the mixture was stirred at 60℃-80℃ for 2-3 h. After centrifugation, washing, and drying, the inorganic nanocomposite particles were obtained.

[0013] As a preferred embodiment of the present invention, the antireflective coating layer is deposited on the surface of the hard-reinforced coating layer and is formed by alternating deposition of two or more inorganic oxides selected from silicon oxide, zirconium oxide, and titanium oxide, with a thickness of 100 nm to 200 nm.

[0014] As a preferred embodiment of the present invention, the antireflective coating layer is further deposited with a coloring layer, which is formed by vapor deposition of one or more of nickel oxide, chromium oxide, ferric oxide, and vanadium oxide, and has a thickness of 5 nm to 30 nm.

[0015] As a preferred embodiment of the present invention, a cross-linked structure layer is provided on the outer surface of the film used for attaching the device, and the surface of the cross-linked structure layer has a nanoscale rough structure with a microscale size of 5 nm to 10 nm. The cross-linked structure is obtained by plasma bombardment or chemical etching.

[0016] As a preferred embodiment of the present invention, the filter layer and the antireflection layer are disposed on one or both sides of the thin film substrate.

[0017] The beneficial effects of this invention are: (1) The present invention, through a multi-layer composite structure consisting of a fixed filter layer and a photosensitive color-changing layer, not only achieves comprehensive control of light in the visible, ultraviolet and near-infrared bands, but also significantly expands the adjustment range of filter performance; the resulting film can achieve adaptive optical adjustment under various lighting conditions, and the transmittance can be adjusted from 10% to 95% in the uncolored state, and can be further reduced to below 5% after coloring, thereby meeting different application scenarios and development needs.

[0018] (2) Compared with electrochromic filter films, the present invention adopts an all-solid-state film structure, which does not require additional power supply and complex assembly. It is thinner and lighter overall, and can be cut into smaller sizes, making it easier to integrate into space-constrained optical devices such as AR glasses, which is beneficial to product lightweighting and structural simplification. The photosensitive color-changing process of the film depends entirely on changes in ambient light and does not consume electrical energy. This avoids the performance degradation and shortened lifespan problems caused by repeated energization of electrochromic materials, and has more stable long-term performance and a longer service life.

[0019] (3) The multilayer composite structure of the present invention includes a hard-reinforced coating, a protective layer and an outer cross-linked structure, which together endow the film with excellent wear resistance and scratch resistance. At the same time, the functional layers are firmly bonded together and are not prone to delamination, bubbles or aging. Overall, it exhibits good environmental adaptability and long-term reliability.

[0020] (4) The inorganic nanocomposite particles in the hard-reinforced coating are designed with an alumina core and a silica shell and modified with a surface silane coupling agent. While maintaining the coating’s extremely high transmittance and low haze, they achieve a combination of rigidity and flexibility and strong interfacial bonding at the nanoscale. This synergistically endows the hard-reinforced coating with wear resistance, environmental durability and stable optical properties, and solves the contradiction between the decrease in transmittance and insufficient mechanical properties caused by light scattering or weak interfaces in traditional reinforcing fillers. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of the functional optical filter film prepared in Example 1 of the present invention. Detailed Implementation

[0023] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0024] It should be noted that, unless otherwise specified, the present invention does not specifically limit the source of the raw materials used in the following embodiments. Commercially available products or products prepared by conventional preparation methods that are well known to those skilled in the art can be used. Experimental methods that do not specify specific conditions are all conventional methods and conventional conditions well known in the art.

[0025] Example 1 This embodiment provides a functional optical filter film, the film structure of which sequentially includes a film substrate, a filter layer 1, a filter layer 2, a protective layer, a hard reinforcing coating, an anti-reflection film layer, and an outer cross-linked structure.

[0026] The film substrate is made of polycarbonate material, with a thickness of 0.3 mm and a diameter of 70 mm. Both sides are flat.

[0027] The filter layer 1 is disposed on both the front and back surfaces of the thin film substrate, and the coating thickness is 5 μm. The formula of the filter layer 1 is as follows, calculated by weight percentage: 25% 3-aminopropyltriethoxysilane, 25% 3-glycidyl etheroxypropyltrimethylsilane, 40% propylene glycol methyl ether, and 10% dye; wherein the dye is a mixture of azo dye, deionized water, and toluene alcohol in a mass ratio of 1:94:5.

[0028] The method for preparing filter layer 1 is as follows: Add the dye to propylene glycol methyl ether according to the formula ratio, stir at room temperature for 45 min, then add 3-aminopropyltriethoxysilane and 3-glycidyl etheroxypropyltrimethylsilane, and continue stirring for 1.5 h to obtain the coating. The film substrate is immersed in the coating by dip-extraction, and then slowly pulled up to coat the coating evenly on the substrate surface. It is pre-cured at 65°C for 25 min and then cured again at 110°C for 2.5 h to obtain the filter layer 1.

[0029] The filter layer 2 is disposed on the filter layer 1, and the coating thickness is 20 μm.

[0030] The formula of the filter layer 2 is as follows, calculated by weight percentage: 80% thermosetting acrylic resin, 6% spirooxazine compound, and the balance xylene.

[0031] The method for preparing filter layer 2 is as follows: Thermosetting acrylic resin, spiroxazine compound and xylene were mixed according to the formula ratio and stirred for 24 h to obtain photoresponsive coating; The photoresponsive coating was applied to the filter layer 1 by spin coating and cured at 125°C for 2.5 hours to obtain the filter layer 2.

[0032] The protective layer is disposed on the filter layer 2 and has a thickness of 20 μm.

[0033] The protective layer is formulated as follows, by weight percentage: 99% polyurethane acrylic resin and 1% 1-hydroxy-cyclohexyl-phenyl ketone.

[0034] The method for preparing filter layer 2 is as follows: According to the formula ratio, polyurethane acrylic resin and 1-hydroxy-cyclohexyl-phenyl ketone are mixed and stirred for 1 h to obtain a protective coating layer. The protective coating was applied to the filter layer 2 using spin coating, and then cured under an LED UV lamp with nitrogen purging at a light energy of 1000 mJ / cm². 2 The protective layer is obtained.

[0035] The hard-reinforcing coating is disposed on the protective layer, and in this embodiment, it is further coated on the corresponding position on another surface (i.e., the back side) of the film, with a coating thickness of 3 μm.

[0036] The formulation of the hard-reinforced coating is as follows, calculated by weight percentage: 22% organosiloxane resin, 7% methanol, 22% ethanol, 2.5% diacetone alcohol, 38% ethylene glycol butyl ether, 2.5% inorganic nanocomposite particles, and the balance being deionized water. The preparation method of the inorganic nanocomposite particles is as follows: α-alumina nanoparticles were dispersed in a 90% ethanol solution. Ammonia and tetraethyl orthosilicate were added dropwise under stirring, wherein the mass ratio of α-alumina nanoparticles to tetraethyl orthosilicate was 1:0.3, and the molar ratio of ammonia to tetraethyl orthosilicate was 3:1. The mixture was stirred at room temperature for 6 h, centrifuged, washed, dried, and then resuspended in an ethanol solution. 1.5% of the particle mass of silane coupling agent KH560 was added, and the mixture was stirred at 70°C for 2.5 h. After centrifugation, washing, and drying, the inorganic nanocomposite particles were obtained.

[0037] The preparation method of the hard-reinforcing coating is as follows: According to the formula ratio, organosiloxane resin, methanol, ethanol, diacetone alcohol, ethylene glycol butyl ether, inorganic nanocomposite particles and deionized water are mixed and stirred for 2 hours to obtain a hard-reinforced coating. The film substrate containing the protective layer is immersed in the hardened coating material using a dip coating method. The coating is slowly lifted to ensure that it is evenly applied to the front and back surfaces. The coating is pre-cured at 60°C for 30 minutes, and then cured again at 120°C for 2.5 hours to obtain the hardened coating material.

[0038] The antireflective coating consists of a six-layer structure of alternating vapor deposition of titanium dioxide and silicon dioxide, plus a coloring layer, and is disposed on the surface of the hard-reinforcing coating. In this embodiment, the coating is disposed on both the front and back surfaces of the film. The specific thickness distribution is as follows: first layer: titanium dioxide, thickness 25nm; second layer: silicon dioxide, thickness 25nm; third layer: titanium dioxide, thickness 25nm; fourth layer: silicon dioxide, thickness 25nm; fifth layer: titanium dioxide, thickness 25nm; sixth layer: silicon dioxide, thickness 25nm; the outermost coloring layer has a thickness of 10nm, and the material used for the coloring layer is nickel oxide.

[0039] The outer cross-linked structure is disposed on the back surface of the film for attaching the device, and is formed by plasma bombardment. The microscale of its surface rough structure is 10 nm. The gas component for plasma bombardment surface treatment is argon, the vacuuming time is 65s, the vacuum degree reaches <10Pa, the power is 350w, and the treatment time is 180s.

[0040] Example 2 This embodiment provides a functional optical filter film, the film structure of which sequentially includes a film substrate, a filter layer 1, a filter layer 2, a protective layer, a hard reinforcing coating, an anti-reflection film layer, and an outer cross-linked structure.

[0041] The film substrate is a high-transparency glass sheet with a thickness of 0.3 mm and a circular shape with a diameter of 70 mm. Both sides are flat. The filter layer 1 is disposed on the light-receiving side of the film, and the coating thickness is 5μm; The formula of the filter layer 1 is as follows, calculated by weight percentage: 30% 3-aminopropyltriethoxysilane, 20% 3-glycidyl etheroxypropyltrimethylsilane, 40% propylene glycol methyl ether, and 10% dye; wherein the dye is a mixture of anthraquinone dye, deionized water, and toluene alcohol in a mass ratio of 1:94:5.

[0042] The method for preparing filter layer 1 is as follows: Add the dye to propylene glycol methyl ether according to the formula ratio, stir at room temperature for 30 min, then add 3-aminopropyltriethoxysilane and 3-glycidyl etheroxypropyltrimethylsilane, and continue stirring for 1 h to obtain the coating. The film substrate is immersed in the coating by dip-extraction, and then slowly pulled up to make the coating evenly coat the surface of the substrate. It is pre-cured at 50°C for 30 min and then cured again at 110°C for 2 h to obtain the filter layer 1.

[0043] The filter layer 2 is disposed on the filter layer 1, and the coating thickness is 20μm; The formula of the filter layer 2 is as follows, calculated by weight percentage: 80% thermosetting acrylic resin, 6% spirooxazine compound, and the balance xylene.

[0044] The method for preparing filter layer 2 is as follows: Thermosetting acrylic resin, spiropyran compound and xylene were mixed according to the formula ratio and stirred for 24 h to obtain photoresponsive coating; The photoresponsive coating was applied to the filter layer 1 by spin coating and cured at 125°C for 2.5 hours to obtain the filter layer 2.

[0045] The protective layer is disposed on the filter layer 2 and has a thickness of 20 μm; The protective layer is formulated as follows, by weight percentage: 99.5% polyurethane acrylic resin and 0.5% 1-hydroxy-cyclohexyl-phenyl ketone.

[0046] The method for preparing filter layer 2 is as follows: According to the formula ratio, polyurethane acrylic resin and 1-hydroxy-cyclohexyl-phenyl ketone are mixed and stirred for 1 h to obtain a protective coating layer. The protective coating was applied to the filter layer 2 using spin coating, and then cured under an LED UV lamp with nitrogen purging at a light energy of 700 mJ / cm². 2 The protective layer is obtained.

[0047] The hard-reinforcing coating has a thickness of 3 μm and is applied to both sides of the film; The formulation of the hard-reinforced coating is as follows, calculated by weight percentage: 20% organosiloxane resin, 5% methanol, 14% ethanol, 4% diacetone alcohol, 40% ethylene glycol butyl ether, 2% inorganic nanocomposite particles, and the balance being deionized water. The preparation method of the inorganic nanocomposite particles is as follows: α-alumina nanoparticles were dispersed in an 85% ethanol solution. Ammonia and tetraethyl orthosilicate were added dropwise under stirring, wherein the mass ratio of α-alumina nanoparticles to tetraethyl orthosilicate was 1:0.1, and the molar ratio of ammonia to tetraethyl orthosilicate was 2:1. The mixture was stirred at room temperature for 4 h, centrifuged, washed, dried, and then resuspended in an ethanol solution. 1% of the particle mass of silane coupling agent KH560 was added, and the mixture was stirred at 70°C for 2 h. After centrifugation, washing, and drying, the inorganic nanocomposite particles were obtained.

[0048] The preparation method of the hard-reinforcing coating is as follows: According to the formula ratio, organosiloxane resin, methanol, ethanol, diacetone alcohol, ethylene glycol butyl ether, inorganic nanocomposite particles and deionized water are mixed and stirred for 2 hours to obtain a hard-reinforced coating. The film substrate containing the protective layer is immersed in the hardened coating material using a dip coating method. The coating is slowly lifted to ensure that it is evenly applied to the front and back surfaces. The coating is pre-cured at 60°C for 30 minutes, and then cured again at 120°C for 2.5 hours to obtain the hardened coating material.

[0049] The antireflective coating consists of a six-layer structure of alternating vapor deposition of titanium dioxide and silicon dioxide, plus a coloring layer, and is disposed on the surface of the hard-reinforcing coating. In this embodiment, the coating is disposed on both the front and back surfaces of the film. The specific thickness distribution is as follows: first layer: titanium dioxide, thickness 30 nm; second layer: silicon dioxide, thickness 30 nm; third layer: titanium dioxide, thickness 30 nm; fourth layer: silicon dioxide, thickness 30 nm; fifth layer: titanium dioxide, thickness 30 nm; sixth layer: silicon dioxide, thickness 30 nm; the outermost coloring layer has a thickness of 10 nm, and the material used for the coloring layer is chromium oxide.

[0050] The outer cross-linked structure is disposed on the back side of the film and is bombarded with plasma, with a microscale size of 10 nm. The gas component for plasma bombardment surface treatment is argon, the vacuuming time is 65s, the vacuum degree reaches <10Pa, the power is 350w, and the treatment time is 180s.

[0051] Example 3 This embodiment provides a functional optical filter film, the film structure of which sequentially includes a film substrate, a filter layer 1, a filter layer 2, a protective layer, a hard-reinforcing coating, an anti-reflective coating layer, and an outer cross-linked structure.

[0052] The film substrate is made of polycarbonate material, the film thickness is 0.3mm, the shape is a circular piece with a diameter of 70mm, and both the front and back sides are flat. The coating thickness of the filter layer 1 is 5 μm, and the filter layer 1 is coated only on the side of the film where the incident light is emitted. The coating thickness of the filter layer 2 is 20 μm; The protective layer has a thickness of 20 μm and is coated on the filter layer 2. The hard-reinforcing coating is 3 μm thick and is applied to both sides of the film. The formulation of the hard-reinforced coating is as follows, calculated by weight percentage: 25% organosiloxane resin, 10% methanol, 14% ethanol, 2% diacetone alcohol, 35% ethylene glycol butyl ether, 3% inorganic nanocomposite particles, and the balance being deionized water. The preparation method of the inorganic nanocomposite particles is as follows: α-alumina nanoparticles were dispersed in a 95% ethanol solution. Ammonia and tetraethyl orthosilicate were added dropwise under stirring, wherein the mass ratio of α-alumina nanoparticles to tetraethyl orthosilicate was 1:0.5, and the molar ratio of ammonia to tetraethyl orthosilicate was 4:1. The mixture was stirred at room temperature for 8 h, centrifuged, washed, dried, and then resuspended in an ethanol solution. 2% of the particle mass of silane coupling agent KH560 was added, and the mixture was stirred at 70°C for 2 h. After centrifugation, washing, and drying, the inorganic nanocomposite particles were obtained.

[0053] The preparation method of the hard-reinforcing coating is as follows: According to the formula ratio, organosiloxane resin, methanol, ethanol, diacetone alcohol, ethylene glycol butyl ether, inorganic nanocomposite particles and deionized water are mixed and stirred for 2 hours to obtain a hard-reinforced coating. The film substrate containing the protective layer is immersed in the hardened coating material using a dip coating method. The coating is slowly lifted to ensure that it is evenly applied to the front and back surfaces. The coating is pre-cured at 60°C for 30 minutes, and then cured again at 120°C for 2.5 hours to obtain the hardened coating material.

[0054] The antireflective coating consists of a six-layer structure of alternating titanium dioxide and silicon dioxide vapor deposition, plus a coloring layer. It is located on the side of the film where incident light enters. The specific thickness distribution is as follows: first layer: titanium dioxide, 20 nm thick; second layer: silicon dioxide, 20 nm thick; third layer: titanium dioxide, 20 nm thick; fourth layer: silicon dioxide, 20 nm thick; fifth layer: titanium dioxide, 20 nm thick; sixth layer: silicon dioxide, 20 nm thick; the outermost coloring layer has a thickness of 10 nm, and the material used for the coloring layer is ferric oxide.

[0055] The outer cross-linked structure is located on the back side of the film and is bombarded with plasma; its microscale is 10 nm. The gas component for plasma bombardment surface treatment is argon, the vacuuming time is 65s, the vacuum degree reaches <10Pa, the power is 350w, and the treatment time is 180s.

[0056] Everything else is the same as in Example 1.

[0057] Example 4 This embodiment provides a color-changing high-transmittance film, the film structure of which includes a film substrate, a filter layer 2, a protective layer, a hard-reinforcing coating, an anti-reflective coating layer, and an outer cross-linked structure.

[0058] The film substrate is made of PMMA polymethyl methacrylate resin material, the film thickness is 0.3mm, and the shape is a circular piece with a diameter of 70mm. The incident light side is designed as a curved surface with a curvature radius R of 762 and a 50W curvature. The reverse side is a flat surface for attachment. The coating thickness of the filter layer 1 is 5 μm, and the filter layer 1 is coated only on the incident light side of the film; the formulation and preparation method of the filter layer 1 are the same as those in Example 1.

[0059] The coating thickness of the filter layer 2 is 20 μm; the formulation and preparation method of the filter layer 2 are the same as those in Example 1.

[0060] The protective layer has a thickness of 20 μm and is coated on the filter layer 2; the formulation and preparation method of the protective layer are the same as in Example 1.

[0061] The hard-reinforcing coating is 3 μm thick and is applied to both sides of the film; the formulation and preparation method of the hard-reinforcing coating are the same as in Example 1.

[0062] The antireflective coating is a six-layer structure consisting of alternating vapor deposition of titanium dioxide and silicon dioxide, located on the side of the thin film where incident light enters. The specific thickness distribution is as follows: first layer: titanium dioxide, 25 nm thick; second layer: silicon dioxide, 25 nm thick; third layer: titanium dioxide, 25 nm thick; fourth layer: silicon dioxide, 25 nm thick; fifth layer: titanium dioxide, 25 nm thick; sixth layer: silicon dioxide, 25 nm thick; it does not contain a coloring layer.

[0063] The outer cross-linked structure is located on the back side of the film and is bombarded with plasma; its microscale size is 10 nm.

[0064] Comparative Example 1 This comparative example provides a commercially available photochromic film, the film structure of which includes a film substrate, a hard-reinforced coating, an anti-reflective coating layer, and an outer cross-linked structure.

[0065] The film substrate is an ABA-type composite bonded photochromic film with a thickness of 0.3 mm; The hard-reinforcing coating is directly applied to the front and back surfaces of the thin film substrate, with a coating thickness of 3 μm. The formulation of the hard-reinforcing coating does not contain inorganic nanocomposite particles, and all other aspects are consistent with Example 1.

[0066] The anti-reflection coating layer is only applied to the side where the incident light enters the thin film, and its structure is the same as in Example 1; The outer cross-linked structure is located on the back side of the film and is bombarded with plasma; its microscale size is 10 nm.

[0067] Comparative Example 2 This comparative example provides a commercially available optical filter film, the film structure of which includes a film substrate, a hard-reinforced coating, an anti-reflective coating layer, and an outer cross-linked structure.

[0068] The film substrate is an ABA-type composite bonded filter film with a thickness of 0.3 mm; The hard-reinforcing coating is directly coated on the surface of the thin film substrate, and the coating thickness is 3μm. The formulation of the hard-reinforcing coating does not contain inorganic nanocomposite particles, and all other aspects are the same as in Example 1.

[0069] The anti-reflection coating layer is only applied to the side where the incident light enters the thin film, and its structure is the same as in Example 1; The outer cross-linked structure is located on the back side of the film and is bombarded with plasma; its microscale size is 10 nm.

[0070] Comparative Example 3 The difference between this comparative example and Example 1 is that no inorganic nanocomposite particles are added to the hard-reinforced coating; otherwise, they are the same as in Example 1.

[0071] Comparative Example 4 The difference between this comparative example and Example 1 is that α-alumina nanoparticles are used instead of inorganic nanocomposite particles in the hard-reinforcing coating, while the rest are the same as in Example 1.

[0072] Optical performance testing In this test, the optical performance was measured using a Photochroimc Advanced Version PLA 2500 photochromic measuring instrument manufactured by Xinlian Optical Technology Co., Ltd. The test data were obtained at 23°C under ISO standard conditions, simulating a solar irradiance of 50,000 Lx. The optical performance test data are shown in Table 1.

[0073] Table 1 Mechanical performance testing (1) Pencil hardness test method: A method for measuring pencil hardness is provided. Using the European standard TY-520 lens surface hardness tester, a pencil of different hardness is used to apply a 750g weight to the film surface and scratch it back and forth at 45° once. Observe whether there are scratches on the film surface. If there are no scratches, increase the pencil hardness grade and repeat the above operation until scratches appear. The hardness before the scratches appear is the film pencil hardness grade.

[0074] (2) Adhesion test method: Refer to the test method for lens coating adhesion in the national standard GB10810. Draw 10*10 grids with a side length of 1mm on the film surface. Use plant adhesive tape to quickly pull the grids 3-5 times and observe the coating condition in the grid area. If there is no sign of detachment, it is a pass; otherwise, it is a fail. (3) Abrasion resistance test method: Refer to the test method for abrasion resistance of lens surface in national standard GB10810. Use abrasion resistance tester to apply 750g of 000# steel wool to the film surface and rub it repeatedly for 1000 times. Test the change of haze value of film. The haze value is measured by Haze Gard equipment to measure the haze values ​​H0 and H1 before and after the film is rubbed. Calculate the haze change value ΔH=H1-H0; (4) QUV aging test method: A QUV aging chamber was used with a UV lamp source of 420nm and the irradiation power was set to 0.55W / m. 2 The temperature was set to 50℃ and the humidity to 90%. The film was continuously tested for 150 hours to observe the aging of the film before and after the test. (5) High temperature and high humidity test method: Set the temperature to 65℃ and humidity to 90% in the aging chamber. After the film is placed in the chamber for 8 hours, it is taken out and placed at room temperature for 16 hours. Then it is placed back into the aging chamber and the cycle is repeated 3 times. The surface condition of the film is observed and recorded. When the film surface shows abnormalities such as cracks, surface shape, or whitening, it is considered as failing. If there are no obvious abnormalities, it is considered as passing. The mechanical performance test data are shown in Table 2.

[0075] Table 2 As can be seen from the examples and comparative data, the filter film prepared by the present invention can control the visible light transmittance of the film within the range of 94% to 8% by adjusting the design. When exposed to outdoor sunlight, the visible light transmittance can be reduced to 3%. Compared with the traditional photochromic film and ordinary dyed filter film in Comparative Examples 1 and 2, it has a more effective blocking effect on incident visible light and is more adjustable.

[0076] On the other hand, a comparison of various mechanical property test data shows that the functional filter film prepared by this invention exhibits superior performance in terms of hardness, coating adhesion, and aging resistance. The introduction of inorganic nanocomposite particles into the hard-reinforcing coating achieves a good balance between mechanical and optical properties.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A functional optical filter film for AR glasses, characterized in that, The functional optical filter film comprises, from bottom to top, a film substrate, filter layer 1, filter layer 2, protective layer, hard reinforcing coating, anti-reflective coating layer, and outer cross-linked structure.

2. The functional optical filter film for AR glasses according to claim 1, characterized in that, The material of the film substrate is one or more of polycarbonate (PC), polyurethane, and polymethyl methacrylate (PMMA), or any one of glass and transparent ceramic; the thickness of the film substrate is 0.1~0.5μm; the shape of the film substrate is any one of circular, elliptical, capsule-shaped, square, or irregular shape adapted to eyeglasses.

3. The functional optical filter film for AR glasses according to claim 1, characterized in that, The filter layer 1 is composed of low-polymer silicone resin, solvent and coloring dye; The low-polymer silicone resin is a high-methyl content silicone resin containing Si-O bonds, specifically a combination of 3-aminopropyltriethoxysilane and 3-glycidyl etheroxypropyltrimethylsilane. The coloring dye is an organic dye and / or an inorganic dye, wherein the inorganic dye is one or two of high carbon black pigment and nano aluminum silicate pigment; and the organic dye is one or more of azo dye, anthraquinone dye, and triarylmethane dye. The content of the coloring dye in the filter layer is 5% to 10% of the total mass of the filter layer; The thickness of the filter layer is 5 μm to 10 μm.

4. The functional optical filter film for AR glasses according to claim 1, characterized in that, The filter layer 2 is a photoresponsive coloring layer, and its composition includes: (a) Resins, including but not limited to one or more of thermosetting acrylic resins, isobutyl acetate, and isocyanate resins; (b) Solvents, including but not limited to one or more of cyclohexanone, xylene, N-methylpyrrolidone, and N,N-dimethylformamide; (c) Photosensitive color-changing substances, including but not limited to one or more of spiroxazine compounds, spiropyran compounds, and succinic anhydride compounds; The thickness of the photoresponsive coloring layer is 5 μm to 30 μm; The visible light transmittance of the film when the photoresponsive coloring layer is in the colored state is 10%~70%.

5. A functional optical filter film for AR glasses according to claim 1, characterized in that, The protective layer is formed of a photocurable epoxy resin containing a photoinitiator, and the thickness of the protective layer is 10 μm to 20 μm.

6. A functional optical filter film for AR glasses according to claim 1, characterized in that, The hard-reinforcing coating formulation is as follows, calculated by weight percentage: 20-25% organosiloxane resin, 5-10% methanol, 14-28% ethanol, 1-4% diacetone alcohol, 35-40% ethylene glycol butyl ether, 2-3% inorganic nanocomposite particles, and the balance being deionized water. The thickness of the hard-reinforcing coating is 2 μm-4 μm. The preparation method of the inorganic nanocomposite particles is as follows: α-alumina nanoparticles were dispersed in an ethanol solution with a mass fraction of 85-95%. Ammonia and tetraethyl orthosilicate were added dropwise under stirring, wherein the mass ratio of α-alumina nanoparticles to tetraethyl orthosilicate was 1:(0.1-0.5), and the molar ratio of ammonia to tetraethyl orthosilicate was (2-4):

1. The mixture was stirred at room temperature for 4-8 h, centrifuged, washed, dried, and then resuspended in an ethanol solution. 1%-2% of the particle mass of silane coupling agent KH560 was added, and the mixture was stirred at 60℃-80℃ for 2-3 h. After centrifugation, washing, and drying, the inorganic nanocomposite particles were obtained.

7. A functional optical filter film for AR glasses according to claim 1, characterized in that, The antireflective coating layer is deposited on the surface of the hard-reinforced coating and is formed by alternating deposition of two or more inorganic oxides selected from silicon oxide, zirconium oxide, and titanium oxide, with a thickness of 100 nm to 200 nm.

8. A functional optical filter film for AR glasses according to claim 1, characterized in that, The antireflective coating layer is further deposited with a coloring layer, which is formed by vapor deposition of one or more of nickel oxide, chromium oxide, ferric oxide, and vanadium oxide, with a thickness of 5 nm to 30 nm.

9. A functional optical filter film for AR glasses according to claim 1, characterized in that, A cross-linked structure layer is provided on the outer surface of the film used for attaching the device. The surface of the cross-linked structure layer has a nanoscale rough structure with a microscale size of 5 nm to 10 nm. The cross-linked structure is obtained by plasma bombardment or chemical etching.

10. A functional optical filter film for AR glasses according to claim 1, characterized in that, The filter layer and the antireflective layer are disposed on one or both sides of the thin film substrate.

Images