Near-to-eye display equipment, lens, self-repairing lens coating film and preparation method of self-repairing lens coating film

Abstract

The invention discloses a near-to-eye display device, a lens, a self-repairing lens coating film and a preparation method thereof, and relates to the technical field of eyes.The self-repairing lens coating film comprises a bottom layer, a self-repairing layer and a hydrophobic layer which are sequentially arranged in a stacked mode, and the bottom layer is used for being attached to the lens; the self-repairing layer is prepared from 75 to 90 parts of polycaprolactone matrix and 8 to 20 parts of tungsten-doped VO2 nano particles; the tungsten-doped VO2 nanoparticles are used for converting light energy into heat energy under illumination and heating the polycaprolactone matrix to a molten state, and the molten-state polycaprolactone matrix is migrated to the scratch or crack position of the self-repairing lens coating and is recombined with the interface of the scratch or crack position to complete self-repairing. The polycaprolactone matrix and the tungsten-doped VO2 nanoparticles are selected to form the self-repairing layer, so that the temperature required for triggering self-repairing of the self-repairing layer is reduced, the hardness of the coating is not affected after repairing, and the self-repairing layer has hardness and self-repairing performance.

Description

Technical Field

[0001] This invention relates to the field of lens technology, and in particular to a near-eye display device, a lens, a self-healing lens coating, and a method for preparing the same. Background Technology

[0002] Lens coatings are used for lens protection and to optimize their optical performance, and are therefore widely used in products such as cameras, telescopes, and eyeglasses. Conventional coatings (such as inorganic coatings like SiO2 and MgF2) have high hardness but are also brittle; even minor scratches can cause permanent damage, affecting optical performance and aesthetics. Once scratched, the entire lens needs to be replaced, which is expensive.

[0003] Therefore, current technologies are developing towards self-healing coatings. However, the triggering conditions for self-healing materials in existing technologies are stringent, with some solutions requiring high temperatures (>80℃) or prolonged light exposure for repair, making them unsuitable for everyday applications. High hardness requires high cross-linking density (such as ceramic coatings), but this inhibits the movement of polymer chain segments in the self-healing material, hindering self-healing. While reversible chemical bonds (such as Diels-Alder bonds) can achieve self-healing, they often reduce coating hardness (pencil hardness <2H). It is evident that the self-healing triggering conditions for existing self-healing materials are stringent, or they affect coating hardness after repair, failing to balance hardness and self-healing performance. Summary of the Invention

[0004] The main objective of this invention is to propose a near-eye display device, a lens, a self-healing lens coating, and a method for preparing the same, aiming to solve the problems in the prior art where the self-healing trigger conditions of self-healing materials are harsh, or the hardness of the coating is affected after repair, making it impossible to balance hardness and self-healing performance.

[0005] To achieve the above objectives, the present invention proposes a self-healing lens coating, comprising a bottom layer, a self-healing layer and a hydrophobic layer stacked sequentially, wherein the bottom layer is used to be applied to the lens, and the self-healing layer comprises 75 to 90 parts of polycaprolactone matrix and 8 to 20 parts of tungsten-doped VO2 nanoparticles by weight. The tungsten-doped VO2 nanoparticles are used to convert light energy into heat energy under illumination and to heat the polycaprolactone matrix to a molten state. The molten polycaprolactone matrix migrates to the scratches or cracks of the self-healing lens coating and recombines with the interface of the scratches or cracks to complete the self-healing process.

[0006] In one embodiment, the tungsten doping mass of the tungsten-doped VO2 nanoparticles accounts for 5% to 8% of the total mass of the tungsten-doped VO2 nanoparticles.

[0007] In one embodiment, the self-healing layer further includes 2 to 5 parts of a coupling agent, which is used to couple the polycaprolactone matrix and the tungsten-doped VO2 nanoparticles; the coupling agent is a silane coupling agent KH-550, and the mass of silane in the silane coupling agent accounts for 2% of the total mass of the coupling agent.

[0008] In one embodiment, the thickness of the bottom layer is 50nm~80nm, the thickness of the self-healing layer is 100nm~150nm, and the thickness of the hydrophobic layer is 20nm~30nm.

[0009] In one embodiment, the bottom layer is a nanocomposite reinforcement layer, which is formed by combining two nanomaterials with different refractive indices, wherein one nanomaterial has a refractive index A and the other nanomaterial has a refractive index B, 1.45. <A<1.65,2.15<B<2.45。

[0010] This invention also provides a method for preparing a self-healing lens coating, the method comprising the following steps: A base layer is prepared by deposition; A mixture of 75 to 90 parts of polycaprolactone matrix and 8 to 20 parts of tungsten-doped VO2 nanoparticles is spin-coated onto the substrate to form a self-healing layer. A hydrophobic layer is prepared on the self-healing layer; The self-healing lens coating is obtained.

[0011] In one embodiment, the step of spin-coating a mixture of 75 to 90 parts of polycaprolactone matrix and 8 to 20 parts of tungsten-doped VO2 nanoparticles onto the substrate to form a self-healing layer includes: The mixture is formed by mixing 75-90 parts of polycaprolactone matrix, 8-20 parts of tungsten-doped VO2 nanoparticles, and 2-5 parts of coupling agent, wherein the tungsten doping mass of the tungsten-doped VO2 nanoparticles accounts for 5%-8% of the total mass of the tungsten-doped VO2 nanoparticles, and the coupling agent is silane coupling agent KH-550, wherein the silane mass of the silane coupling agent accounts for 2% of the total mass of the coupling agent; In a nitrogen atmosphere, the mixture is spin-coated onto the substrate at a speed of 3000 rpm to form the self-healing layer.

[0012] In one embodiment, the step of depositing and preparing an underlayer includes: Under an argon atmosphere, SiO2 and TiO2 materials are deposited by magnetron sputtering at a preset temperature to form a SiO2-TiO2 nanocomposite reinforcement layer to obtain the bottom layer.

[0013] In one embodiment, the step of preparing a hydrophobic layer on the self-healing layer includes: A hydrophobic material is coated onto the self-healing layer, and the hydrophobic material is cured by an ultraviolet curing process to form the hydrophobic layer.

[0014] The present invention also provides a lens having the above-described self-healing lens coating or the self-healing lens coating prepared by the above-described method.

[0015] The present invention also provides a near-eye display device, wherein the near-eye display device uses the above-mentioned lens.

[0016] The technical solution of this invention utilizes polycaprolactone-based shape memory polymers for lens coating and visible-light-responsive tungsten-doped VO2 nanoparticles as a photothermal conversion agent. Firstly, the polycaprolactone matrix has a lower melting point (around 60°C) compared to existing self-healing materials. Unlike traditional self-healing polymers that require temperatures above 80°C for triggering, the polycaprolactone matrix melts and flows at a lower temperature, facilitating self-healing under everyday environmental conditions (such as sunlight). Secondly, the tungsten-doped VO2 nanoparticles are dispersed in the coating, preserving the semi-crystalline structure of the polycaprolactone matrix. Upon cooling, the polycaprolactone matrix can re-solidify to form a stable semi-crystalline structure, resulting in a strong bond at the repair interface and preventing coating softening. Unlike reversible chemical bond materials, it does not experience a decrease in hardness due to reversible bond breakage, thus ensuring the structural and performance stability of the coating after multiple repairs. Furthermore, the tungsten-doped VO2 nanoparticles possess highly efficient photothermal conversion capabilities within the visible light range. Doping with tungsten can significantly reduce the phase transition temperature of VO2, enabling it to rapidly heat up under ordinary outdoor visible light conditions and efficiently convert light energy into heat energy, thereby precisely raising the local temperature to the melting range of the polycaprolactone matrix. This invention uses a polycaprolactone matrix and tungsten-doped VO2 nanoparticles to form a self-healing layer, which reduces the temperature required to trigger self-healing without affecting the coating hardness after repair, thus giving the self-healing layer both hardness and self-healing properties. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating a method for preparing a self-healing lens coating according to an embodiment of the present invention; Figure 2This is a detailed flowchart of step S200 of the method for preparing a self-healing lens coating according to an embodiment of the present invention.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Existing self-healing materials have stringent triggering conditions, with some solutions requiring high temperatures (>80℃) or prolonged light exposure for repair, making them unsuitable for everyday applications. High hardness requires high cross-linking density (such as ceramic coatings), but this inhibits polymer chain movement within the self-healing material, hindering self-healing. While reversible chemical bonds (such as Diels-Alder bonds) can achieve self-healing, they often reduce coating hardness (pencil hardness <2H). Therefore, existing self-healing materials have stringent self-healing triggering conditions or negatively impact coating hardness after repair, failing to balance hardness and self-healing performance.

[0024] To address the above problems, this invention proposes a self-healing lens coating.

[0025] The self-healing lens coating of this embodiment includes a bottom layer, a self-healing layer, and a hydrophobic layer stacked sequentially. The bottom layer is used to adhere to the lens. By mass, the self-healing layer includes 75 to 90 parts of polycaprolactone matrix and 8 to 20 parts of tungsten-doped VO2 nanoparticles. The tungsten-doped VO2 nanoparticles are used to convert light energy into heat energy under illumination and to heat the polycaprolactone matrix to a molten state. The molten polycaprolactone matrix migrates to the scratches or cracks of the self-healing lens coating and recombines with the interface of the scratches or cracks to complete the self-healing process.

[0026] The technical solution of this invention utilizes polycaprolactone-based shape memory polymers for lens coating and visible-light-responsive tungsten-doped VO2 nanoparticles as a photothermal conversion agent. Firstly, the polycaprolactone matrix has a lower melting point (around 60°C) compared to existing self-healing materials. Unlike traditional self-healing polymers that require temperatures above 80°C for triggering, the polycaprolactone matrix melts and flows at a lower temperature, facilitating self-healing under everyday environmental conditions (such as sunlight). Secondly, the tungsten-doped VO2 nanoparticles are dispersed in the coating, preserving the semi-crystalline structure of the polycaprolactone matrix. Upon cooling, the polycaprolactone matrix can re-solidify to form a stable semi-crystalline structure, resulting in a strong bond at the repair interface and preventing coating softening. Unlike reversible chemical bond materials, it does not experience a decrease in hardness due to reversible bond breakage, thus ensuring the structural and performance stability of the coating after multiple repairs. Furthermore, the tungsten-doped VO2 nanoparticles possess highly efficient photothermal conversion capabilities within the visible light range. Doping with tungsten can significantly reduce the phase transition temperature of VO2, enabling it to rapidly heat up under ordinary outdoor visible light conditions and efficiently convert light energy into heat energy, thereby precisely raising the local temperature to the melting range of the polycaprolactone matrix. This invention uses a polycaprolactone matrix and tungsten-doped VO2 nanoparticles to form a self-healing layer, which reduces the temperature required to trigger self-healing without affecting the coating hardness after repair, thus giving the self-healing layer both hardness and self-healing properties.

[0027] In one embodiment, the tungsten doping mass of the tungsten-doped VO2 nanoparticles accounts for 5% to 8% of the total mass of the tungsten-doped VO2 nanoparticles.

[0028] By controlling the tungsten doping mass in tungsten-doped VO2 nanoparticles to 5%–8% of the total mass of the nanoparticles, the photothermal conversion performance of tungsten-doped VO2 nanoparticles can be significantly optimized. Tungsten doping lowers the phase transition temperature of VO2, allowing it to undergo a phase transition and produce a significant photothermal effect under visible light. When the tungsten doping content is within the range of 5%–8%, the photothermal conversion efficiency and crystal structure stability are in a better balance, enabling rapid heating of the polycaprolactone matrix to its melting temperature range under ordinary sunlight irradiation, thereby achieving rapid and effective self-repair.

[0029] In one embodiment, the self-healing layer further includes 2 to 5 parts of a coupling agent, which is used to couple the polycaprolactone matrix and the tungsten-doped VO2 nanoparticles; the coupling agent is a silane coupling agent KH-550, and the mass of silane in the silane coupling agent accounts for 2% of the total mass of the coupling agent.

[0030] Adding 2 to 5 parts of silane coupling agent KH-550 to the self-healing layer can significantly improve the interfacial bonding between the polycaprolactone matrix and tungsten-doped VO2 nanoparticles. The molecular structure of silane coupling agent KH-550 contains both silane groups that can form chemical bonds with the surface of inorganic particles and organic groups that can bind to polymer segments. The silane accounts for 2% of the total mass of the coupling agent, ensuring effective hydrolysis and bonding of the silane groups on the particle surface. Through this coupling effect, the tungsten-doped VO2 nanoparticles can be uniformly and stably dispersed in the polycaprolactone matrix, avoiding agglomeration and thus improving the overall uniformity and stability of the self-healing layer. In one embodiment, the self-healing layer further includes 0 to 2 parts of dynamic disulfide bond repair agent. Adding 0 to 2 parts of dynamic disulfide bond repair agent to the self-healing layer can significantly shorten the repair time of the self-healing lens coating, enabling the coating to complete a high degree of interface recovery under short-term light exposure conditions, thereby improving self-healing efficiency and ease of use.

[0031] In one embodiment, the thickness of the bottom layer is 50nm~80nm, the thickness of the self-healing layer is 100nm~150nm, and the thickness of the hydrophobic layer is 20nm~30nm.

[0032] In one embodiment, the bottom layer is a nanocomposite reinforcement layer, which is formed by combining two nanomaterials with different refractive indices, one of which has a refractive index A and the other has a refractive index B of 1.45. <A<1.65,2.15<B<2.45。

[0033] The bottom layer is designed as a nanocomposite reinforcement layer, and the refractive index difference between the two nanomaterials is at least 0.5. After the nanomaterials with large refractive index differences are combined, they can effectively interfere and scatter light passing through the bottom layer, so that the light passes through a more optimized propagation path between different interfaces, thereby reducing interface reflection loss and improving the overall transmittance of the bottom layer.

[0034] Please combine Figure 1 and Figure 2 The present invention also provides a method for preparing a self-healing lens coating, the method comprising the following steps: S100: Deposition preparation of an underlayer; S200: A mixture of 75 to 90 parts of polycaprolactone matrix and 8 to 20 parts of tungsten-doped VO2 nanoparticles is spin-coated onto the substrate to form a self-healing layer; S300: A hydrophobic layer is prepared on the self-healing layer; S400: Obtain a self-healing lens coating.

[0035] In one embodiment, step S200 includes: S210: The mixture is formed by mixing 75-90 parts of polycaprolactone matrix, 8-20 parts of tungsten-doped VO2 nanoparticles, and 2-5 parts of coupling agent, wherein the tungsten doping mass of the tungsten-doped VO2 nanoparticles accounts for 5%-8% of the total mass of the tungsten-doped VO2 nanoparticles, and the coupling agent is silane coupling agent KH-550, and the silane mass of the silane coupling agent accounts for 2% of the total mass of the coupling agent; S220: In a nitrogen atmosphere, spin-coat the mixture onto the substrate at a speed of 3000 rpm to form a self-healing layer.

[0036] In one embodiment, step S100 includes: S110: Under an argon atmosphere, SiO2 and TiO2 materials are deposited by magnetron sputtering at a preset temperature to form a SiO2-TiO2 nanocomposite reinforcement layer to obtain the bottom layer.

[0037] By fabricating the underlying layer into a SiO2-TiO2 nanocomposite reinforcement layer composed of SiO2 and TiO2, the interfacial bonding force between the underlying layer and the self-healing layer can be significantly improved. Silica has good surface hydroxyl activity, which can form a stronger interfacial interaction with the subsequently coated polycaprolactone matrix, thereby improving the adhesion of the self-healing layer to the underlying layer; titanium dioxide has high surface energy, which can further increase the wettability of the self-healing layer at the interface, allowing the polycaprolactone matrix to spread more fully and penetrate into the gaps of the nanocomposite structure during deposition or curing, thereby forming a more stable physical interlocking structure.

[0038] In one embodiment, step S300 includes: S310: A hydrophobic material is coated onto the self-healing layer and cured using a UV curing process to form a hydrophobic layer.

[0039] It should be noted that different materials can be selected for the hydrophobic layer depending on the application scenario, in order to optimize the hydrophobic properties, heat resistance, and corrosion resistance.

[0040] By curing the hydrophobic layer with ultraviolet light, the bonding force between the hydrophobic layer and the self-healing layer can be enhanced. Furthermore, the combination with the SiO2-TiO2 nanocomposite reinforcement layer forms a sandwich structure, which further enhances the interlayer bonding force.

[0041] In order to enable those skilled in the art to clearly understand the details and operations of the above embodiments of this application, and to demonstrate the significant improvement in performance of the embodiments of this application, the above technical solutions are illustrated below through multiple embodiments.

[0042] Example 1: Under an argon atmosphere, SiO2 and TiO2 materials were deposited by magnetron sputtering at 150℃ to form a SiO2-TiO2 nanocomposite reinforcement layer, thus obtaining the bottom layer; A mixture of 82 parts polycaprolactone matrix, 15 parts tungsten-doped VO2 nanoparticles, and 3 parts coupling agent was formed. The mixture was then spin-coated onto the substrate at 3000 rpm in a nitrogen atmosphere to form a self-healing layer. The tungsten doping mass of the tungsten-doped VO2 nanoparticles accounted for 5% of the total mass of the tungsten-doped VO2 nanoparticles. The coupling agent was silane coupling agent KH-550, and the silane mass of the silane coupling agent accounted for 2% of the total mass of the coupling agent. A hydrophobic material is coated onto the self-healing layer and then cured using an ultraviolet curing process to form a hydrophobic layer.

[0043] The photothermal conversion efficiency of the tungsten-doped VO2 nanoparticles in the self-healing lens coating in Example 1 is 70%~85%, with strong reversibility and long service life. The melting point of the self-healing layer is 54℃~58℃, the repair time under strong light irradiation is 8-12 minutes, and the transmittance in the visible light band is 81%~84%, which can be used for...

[0044] Example 2: Under an argon atmosphere, SiO2 and TiO2 materials were deposited by magnetron sputtering at 150℃ to form a SiO2-TiO2 nanocomposite reinforcement layer, thus obtaining the bottom layer; A mixture of 75 parts polycaprolactone matrix, 20 parts tungsten-doped VO2 nanoparticles, 3 parts coupling agent, and 2 parts dynamic disulfide bond repair agent was prepared. The mixture was then spin-coated onto a substrate at 3000 rpm under nitrogen atmosphere to form a self-healing layer. The ratio of polycaprolactone matrix to tungsten-doped VO2 nanoparticles was [ratio missing]. The ratio of tungsten to VO2 nanoparticles is 80:15. The tungsten doping mass accounts for 7% of the total mass of the tungsten-doped VO2 nanoparticles. The coupling agent is silane coupling agent KH-550, and the silane mass in the silane coupling agent accounts for 2% of the total mass of the coupling agent. A hydrophobic material is coated onto the self-healing layer and then cured using an ultraviolet curing process to form a hydrophobic layer.

[0045] The photothermal conversion efficiency of the tungsten-doped VO2 nanoparticles in the self-healing lens coating in Example 2 is 70%~85%, with strong reversibility and long service life. The melting point of the self-healing layer is 48℃~52℃, the repair time under strong light irradiation is 5 minutes, and the transmittance in the visible light band is >78%. It is suitable for sports glasses with high lens wear frequency and frequent repair.

[0046] Example 3: Under an argon atmosphere, SiO2 and TiO2 materials were deposited by magnetron sputtering at 150℃ to form a SiO2-TiO2 nanocomposite reinforcement layer, thus obtaining the bottom layer; A mixture of 90 parts polycaprolactone matrix, 8 parts tungsten-doped VO2 nanoparticles, and 2 parts coupling agent was formed. The mixture was then spin-coated onto the substrate at 3000 rpm in a nitrogen atmosphere to form a self-healing layer. The tungsten doping mass of the tungsten-doped VO2 nanoparticles accounted for 8% of the total mass of the tungsten-doped VO2 nanoparticles. The coupling agent was silane coupling agent KH-550, and the silane mass of the silane coupling agent accounted for 2% of the total mass of the coupling agent. A hydrophobic material is coated onto the self-healing layer and then cured using an ultraviolet curing process to form a hydrophobic layer.

[0047] In Example 3, the photothermal conversion efficiency of tungsten-doped VO2 nanoparticles in the self-healing lens coating is 70%~85%, with strong reversibility and long service life. The melting point of the self-healing layer is 58℃~60℃, and the repair time of the self-healing layer under strong light irradiation is 15~30 minutes. The visible light transmittance of the coating is >90%, making it suitable for scenarios with high transmittance requirements, such as driving lenses.

[0048] Comparative Example 1: The bottom layer was obtained using SiO2 and Ta2O5; A mixture of polyurethane gel and ZnO particles was used to prepare a self-healing layer on the substrate. Preparation to obtain a hydrophobic layer; The photothermal conversion efficiency of the ZnO particles in the self-healing layer in Comparative Example 1 is less than 30%, which results in a long repair time for the self-healing layer. In addition, the ZnO particles are prone to photocorrosion, which leads to a short service life for the self-healing layer.

[0049] Comparative Example 2: The bottom layer is obtained using Al2O3 and TiO2; A mixture of polyurethane gel and Cu2O particles was used to prepare a self-healing layer on the substrate. Preparation to obtain a hydrophobic layer; The photothermal conversion efficiency of Cu2O particles in the self-healing layer in Comparative Example 2 is 40%~50%, which results in a long repair time for the self-healing layer. In addition, Cu2O particles are prone to oxidation, resulting in a short service life for the self-healing layer.

[0050] As can be seen, compared with Comparative Examples 1 and 2, the particles in the self-healing layer of Embodiments 1, 2 and 3 of this application have higher photothermal conversion efficiency, lower melting point, shorter repair time, higher visible light transmittance of the coating, and longer service life.

[0051] The present invention also provides a lens having the above-described self-healing lens coating or a self-healing lens coating prepared by the above-described method. The specific structure of this self-healing lens coating is as described in the above embodiments. Since this lens employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0052] The present invention also provides a near-eye display device, wherein the near-eye display device utilizes the aforementioned lens. The specific structure of the lens is as described in the above embodiments. Since this near-eye display device employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. Specifically, the near-eye display device can be a VR device, an AR device, or a MR device, etc.

[0053] The above are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A self-healing lens coating, characterized in that, The material includes a bottom layer, a self-healing layer and a hydrophobic layer stacked in sequence. The bottom layer is used to be applied to the lens. By mass, the self-healing layer includes 75 to 90 parts of polycaprolactone matrix and 8 to 20 parts of tungsten-doped VO2 nanoparticles. The tungsten-doped VO2 nanoparticles are used to convert light energy into heat energy under illumination and to heat the polycaprolactone matrix to a molten state. The molten polycaprolactone matrix migrates to the scratches or cracks of the self-healing lens coating and recombines with the interface of the scratches or cracks to complete the self-healing process.

2. The self-healing lens coating as described in claim 1, characterized in that, The tungsten doping mass of the tungsten-doped VO2 nanoparticles accounts for 5% to 8% of the total mass of the tungsten-doped VO2 nanoparticles.

3. The self-healing lens coating as described in claim 2, characterized in that, The self-healing layer also contains 2 to 5 parts of coupling agent, which is used to couple the polycaprolactone matrix and the tungsten-doped VO2 nanoparticles; the coupling agent is silane coupling agent KH-550, and the mass of silane in the silane coupling agent accounts for 2% of the total mass of the coupling agent.

4. The self-healing lens coating as described in any one of claims 1 to 3, characterized in that, The thickness of the bottom layer is 50nm~80nm, the thickness of the self-healing layer is 100nm~150nm, and the thickness of the hydrophobic layer is 20nm~30nm.

5. The self-healing lens coating as described in any one of claims 1 to 3, characterized in that, The bottom layer is a nanocomposite reinforcement layer, which is formed by combining two nanomaterials with different refractive indices. One nanomaterial has a refractive index of A, and the other nanomaterial has a refractive index of B, 1.

45. <A<1.65,2.15<B<2.45。 6. A method for preparing a self-healing lens coating, characterized in that, The method for preparing the self-healing lens coating includes the following steps: A base layer is prepared by deposition; A mixture of 75 to 90 parts of polycaprolactone matrix and 8 to 20 parts of tungsten-doped VO2 nanoparticles is spin-coated onto the substrate to form a self-healing layer. A hydrophobic layer is prepared on the self-healing layer; The self-healing lens coating is obtained.

7. The method for preparing the self-healing lens coating as described in claim 6, characterized in that, The step of spin-coating a mixture of 75 to 90 parts of polycaprolactone matrix and 8 to 20 parts of tungsten-doped VO2 nanoparticles onto the substrate to form a self-healing layer includes: The mixture is formed by mixing 75-90 parts of polycaprolactone matrix, 8-20 parts of tungsten-doped VO2 nanoparticles, and 2-5 parts of coupling agent, wherein the tungsten doping mass of the tungsten-doped VO2 nanoparticles accounts for 5%-8% of the total mass of the tungsten-doped VO2 nanoparticles, and the coupling agent is silane coupling agent KH-550, wherein the silane mass of the silane coupling agent accounts for 2% of the total mass of the coupling agent; In a nitrogen atmosphere, the mixture is spin-coated onto the substrate at a speed of 3000 rpm to form the self-healing layer.

8. The method for preparing the self-healing lens coating as described in claim 7, characterized in that, The steps for preparing an underlayer by deposition include: Under an argon atmosphere, SiO2 and TiO2 materials are deposited by magnetron sputtering at a preset temperature to form a SiO2-TiO2 nanocomposite reinforcement layer to obtain the bottom layer.

9. The method for preparing the self-healing lens coating as described in claim 6, characterized in that, The step of preparing a hydrophobic layer on the self-healing layer includes: A hydrophobic material is coated onto the self-healing layer, and the hydrophobic material is cured by an ultraviolet curing process to form the hydrophobic layer.

10. A lens, characterized in that, The lens is coated with the self-healing lens coating prepared by any one of claims 1 to 5 or by any one of claims 6 to 9.

11. A near-eye display device, characterized in that, The near-eye display device uses the lens as described in claim 10.

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