阅读说明：本技术 光学复合膜及其制备方法、应用和显示装置 (Optical composite film, preparation method and application thereof and display device ) 是由 张迅 易伟华 周成 成育凯 刘明礼 郑芳平 唐运生 于 2021-06-29 设计创作，主要内容包括：本发明涉及一种光学复合膜及其制备方法、应用和显示装置。上述光学复合膜包括层叠设置的变色层和防紫外膜层；变色层是通过在基底上布上变色溶液并干燥后形成,按摩尔百分比计,变色溶液包括：有机光致变色粉2％～8％、加硬液10％～20％、醇类载体70％～80％及溶剂0～5％；防紫外膜层包括多个高折射率层和多个低折射率层,且高折射率层和低折射率层交替设置,防紫外膜层的整体紫外透过率≤10％。上述光学复合膜能够将变色层与防紫外膜层结合且结合力好,使得光学复合膜能够在实现变色的同时,吸收紫外线,能够应用在智能眼镜或显示装置中。(The invention relates to an optical composite film, a preparation method, application and a display device thereof. The optical composite film comprises a color changing layer and an ultraviolet-proof film layer which are arranged in a laminated manner; the color-changing layer is formed by coating color-changing solution on the substrate and drying, wherein the color-changing solution comprises the following components in percentage by mol: 2-8% of organic photochromic powder, 10-20% of hardening liquid, 70-80% of alcohol carrier and 0-5% of solvent; the ultraviolet-proof film layer comprises a plurality of high refractive index layers and a plurality of low refractive index layers, the high refractive index layers and the low refractive index layers are alternately arranged, and the integral ultraviolet transmittance of the ultraviolet-proof film layer is less than or equal to 10%. Above-mentioned optical composite film can combine and cohesion is good with discoloration layer and anti ultraviolet rete for optical composite film can absorb the ultraviolet ray when realizing discolouing, can use in intelligent glasses or display device.)

1. An optical composite film is characterized by comprising a color changing layer and an ultraviolet-proof film layer which are arranged in a stacked mode;

the color-changing layer is formed by coating a color-changing solution on a substrate and drying, wherein the color-changing solution comprises the following components in percentage by mol: 2-8% of organic photochromic powder, 10-20% of hardening liquid, 70-80% of alcohol carrier and 0-5% of solvent;

the ultraviolet-proof film layer comprises a plurality of high refractive index layers and a plurality of low refractive index layers, the high refractive index layers and the low refractive index layers are alternately arranged, and the ultraviolet transmittance of the whole ultraviolet-proof film layer is less than or equal to 10%.

2. The optical composite film according to claim 1, wherein the organic photochromic powder is at least one selected from azo compounds and naphthol compounds; and/or the hardening liquid comprises a coupling agent, an episulfide monomer and a catalyst.

3. The optical composite film according to claim 1, wherein the color-changing layer has a thickness of 1 μm to 5 μm.

4. The optical composite film according to any one of claims 1 to 3, wherein the ultraviolet shielding film layer comprises a first high refractive index layer having a thickness of 5nm to 20nm, a first low refractive index layer having a thickness of 35nm to 55nm, a second high refractive index layer having a thickness of 35nm to 55nm, a second low refractive index layer having a thickness of 10nm to 25nm, a third high refractive index layer having a thickness of 60nm to 85nm, and a third low refractive index layer having a thickness of 85nm to 110nm, which are stacked in this order, and the first high refractive index layer is closer to the discoloration layer than the third low refractive index layer.

5. The optical composite film according to claim 4, wherein the refractive index of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer is 1.8 to 2.4; and/or the presence of a catalyst in the reaction mixture,

the materials of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer are each independently selected from Ti₃O₅、Nb₂O₅、Si₃N₄And LaTiO₃One of (1); and/or the presence of a catalyst in the reaction mixture,

the refractive indices of the first low refractive index layer, the second low refractive index layer and the third low refractive index layer are 1.35-1.49; and/or the presence of a catalyst in the reaction mixture,

the materials of the first low refractive index layer, the second low refractive index layer and the third low refractive index layer are respectively and independently selected from SiO₂And MgF₂One kind of (1).

6. A method for preparing an optical composite film, comprising the steps of:

mixing the following raw materials in percentage by mole: 2-8% of organic photochromic powder, 10-20% of hardening liquid, 70-80% of alcohol carrier and 0-5% of solvent, and preparing a photochromic solution;

coating the color-changing solution on a substrate, and then drying to form a color-changing layer on the substrate;

the ultraviolet-proof film layer is formed on one side, away from the substrate, of the color changing layer and comprises a plurality of high-refractive-index layers and a plurality of low-refractive-index layers, the high-refractive-index layers and the low-refractive-index layers are arranged in an alternating mode, and the overall ultraviolet transmittance of the ultraviolet-proof film layer is less than or equal to 10%.

7. The method of claim 6, wherein the UV-blocking layer is formed on the side of the color-changing layer away from the substrate by vacuum coating.

8. The method of claim 6, wherein the step of applying the color-changing solution on a substrate and then drying comprises:

and dip-dyeing the substrate in the color-changing solution for 2-10 h, and then taking out and drying at 80-100 ℃ for 30-60 min.

9. Use of the optical composite film according to any one of claims 1 to 5 or the optical composite film according to any one of claims 6 to 8 in the production of optical glasses or display devices.

10. A display device comprising a display panel and an optical composite film formed on the display panel, wherein the optical composite film is the optical composite film according to any one of claims 1 to 5 or the optical composite film produced by the method for producing an optical composite film according to any one of claims 6 to 8.

Technical Field

The invention relates to the field of optics, in particular to an optical composite film, a preparation method, application and a display device thereof.

Background

The photochromic material is changed in color by changing the molecular state of the photochromic material under the illumination of certain wavelength and intensity, and the photochromic material exists in another structure or aggregation state to change the color of the photochromic material, and meanwhile, the absorption rate of visible light is greatly increased. And then reversibly returns to the original state under the action of heat or other means, while the absorption of visible light is greatly reduced. The use of color changing technology on the goggles can weaken strong light and then enter human eyes to play a role in protection. However, color-changing products generally only weaken the intense light, reducing the transmission of visible light, and do not absorb ultraviolet light. Excessive exposure to uv light can cause skin cancer, and in addition to skin cancer, uv radiation can increase the chances of developing eye problems such as cataracts, macular degeneration, and the like, and destroy the immune system. The working principle of the ultraviolet-proof film layer is that one or more layers of structures are processed on the surface of the substrate in a chemical coating or physical film coating mode to enable ultraviolet light to be absorbed and reflected, and therefore the energy of the ultraviolet light penetrating through the substrate can be reduced. The color changing technology is combined with the ultraviolet-proof technology, so that the transmittance of visible light can be reduced under strong light, and ultraviolet rays can be absorbed at the same time.

However, the traditional inorganic color-changing layer is processed by adopting a vacuum coating mode, and cannot be designed together with the ultraviolet-proof film layer; the organic color-changing layer has the problem of poor binding force when the ultraviolet-proof film layer is processed on the organic color-changing layer due to the binding force. Therefore, there is no product or technique for effectively combining the uv blocking film layer with the discoloration layer at present.

Disclosure of Invention

In view of the above, it is necessary to provide an optical composite film capable of improving the bonding force between the color changing layer and the ultraviolet-proof film layer, so that the optical composite film can absorb ultraviolet rays while realizing color change.

In addition, a preparation method, an application and a display device of the optical composite film are also needed to be provided.

An optical composite film comprises a color changing layer and an ultraviolet-proof film layer which are arranged in a laminated manner;

the color-changing layer is formed by coating a color-changing solution on a substrate and drying, wherein the color-changing solution comprises the following components in percentage by mol: 2-8% of organic photochromic powder, 10-20% of hardening liquid, 70-80% of alcohol carrier and 0-5% of solvent;

the ultraviolet-proof film layer comprises a plurality of high refractive index layers and a plurality of low refractive index layers, the high refractive index layers and the low refractive index layers are alternately arranged, and the ultraviolet transmittance of the whole ultraviolet-proof film layer is less than or equal to 10%.

In one embodiment, the organic photochromic powder is at least one selected from azo compounds and naphthol compounds; and/or the hardening liquid comprises a coupling agent, an episulfide monomer and a catalyst.

In one embodiment, the color-changing layer has a thickness of 1 μm to 5 μm.

In one embodiment, the ultraviolet shielding film layer includes a first high refractive index layer having a thickness of 5nm to 20nm, a first low refractive index layer having a thickness of 35nm to 55nm, a second high refractive index layer having a thickness of 35nm to 55nm, a second low refractive index layer having a thickness of 10nm to 25nm, a third high refractive index layer having a thickness of 60nm to 85nm, and a third low refractive index layer having a thickness of 85nm to 110nm, which are sequentially stacked, and the first high refractive index layer is closer to the discoloration layer than the third low refractive index layer.

In one embodiment, the refractive index of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer is 1.8-2.4; and/or the presence of a catalyst in the reaction mixture,

the materials of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer are each independently selected from Ti₃O₅、Nb₂O₅、Si₃N₄And LaTiO₃One of (1); and/or the presence of a catalyst in the reaction mixture,

the refractive indices of the first low refractive index layer, the second low refractive index layer and the third low refractive index layer are 1.35-1.49; and/or the presence of a catalyst in the reaction mixture,

the materials of the first low refractive index layer, the second low refractive index layer and the third low refractive index layer are respectively and independently selected from SiO₂And MgF₂One kind of (1).

A method for preparing an optical composite film comprises the following steps:

mixing the following raw materials in percentage by mole: 2-8% of organic photochromic powder, 10-20% of hardening liquid, 70-80% of alcohol carrier and 0-5% of solvent, and preparing a photochromic solution;

coating the color-changing solution on a substrate, and then drying to form a color-changing layer on the substrate;

the ultraviolet-proof film layer is formed on one side, away from the substrate, of the color changing layer and comprises a plurality of high-refractive-index layers and a plurality of low-refractive-index layers, the high-refractive-index layers and the low-refractive-index layers are arranged in an alternating mode, and the overall ultraviolet transmittance of the ultraviolet-proof film layer is less than or equal to 10%.

In one embodiment, the ultraviolet-proof film layer is formed on the side of the color-changing layer far away from the substrate by vacuum coating.

In one embodiment, the step of applying the color-changing solution to a substrate and then drying comprises:

and dip-dyeing the substrate in the color-changing solution for 2-10 h, and then taking out and drying at 80-100 ℃ for 30-60 min.

The optical composite film or the optical composite film prepared by the preparation method of the optical composite film is applied to the preparation of optical glasses or display devices.

A display device comprises a display screen and an optical composite film formed on the display screen, wherein the optical composite film is the optical composite film or the optical composite film prepared by the preparation method of the optical composite film.

Above-mentioned optical composite film combines organic photochromic layer and anti ultraviolet rete, through add the stiffened liquid in the solution that discolours, alcohol carrier and the cooperation of organic photochromic powder, make the cohesion of discoloration layer and anti ultraviolet rete good, and the ratio through the solution that discolours of control, make the discoloration effect of discoloration layer good, and then make optical composite film under the strong condition of light, the discoloration layer can make the highlight weak, reduce the transmissivity to visible light, absorb the ultraviolet ray simultaneously, make the transmissivity of ultraviolet ray reduce, avoid causing the injury to the human body. Under the condition of not strong light, the organic photochromic layer can restore the initial state, so that the transmittance of visible light is increased, and the transmittance of ultraviolet light is reduced. Therefore, above-mentioned optical composite film can combine and cohesion is good with discoloration layer and anti ultraviolet rete for optical composite film can be when realizing discolouing, absorbs the ultraviolet ray, can use in intelligent glasses or display device.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the following description taken in conjunction with the accompanying drawings. The detailed description sets forth the preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The optical composite film of an embodiment comprises a color changing layer and an ultraviolet-proof film layer which are arranged in a stacked mode, wherein the color changing layer is formed by coating a color changing solution on a substrate and drying the color changing solution, and the color changing solution comprises the following components in percentage by mol: 2-8% of organic photochromic powder, 10-20% of hardening liquid, 70-80% of alcohol carrier and 0-5% of solvent.

Wherein the organic photochromic powder is at least one selected from azo compounds and naphthol compounds. In one example, the organic photochromic powder is available from CNF corporation, korea. The color of the organic photochromic powder is changed by breaking chemical bonds of azo compounds and/or naphthol substances under strong light. Under the condition of withdrawal, the broken chemical bonds are recovered, and the color is recovered to be normal.

Specifically, the organic photochromic powder is present in the color-changing solution in a molar percentage of 2%, 3%, 4%, 5%, 6%, 7% or 8%. The mole percentage of the organic photochromic powder is too small, the dyeing is insufficient, and the color change is not obvious; the organic photochromic powder has too large mole percentage, and may not be fully dissolved with the carrier, thereby causing waste. It is understood that the kind and ratio of the color-changing powder can be adjusted within the above range according to the degree of color change of the color-changing product to achieve the best color-changing effect.

The inorganic photochromic material is mainly metal oxide such as WO and the like, cannot form a photochromic layer in a dip dyeing mode, and can only form the photochromic layer in an evaporation plating mode. When the thickness of the inorganic color-changing layer formed by adopting the evaporation method is too small, the color-changing effect cannot be achieved, and the level generally needs to reach the micron level, but WO per se is also a high-refractive-index material, and at the level of the thickness, the inorganic color-changing layer cannot be matched with the material in the ultraviolet-proof film layer, so that the film layer has the anti-reflection effect due to mutual interference of the film layer, therefore, the inorganic color-changing material cannot be matched with the ultraviolet-proof film layer, and simultaneously has the functions of changing color and absorbing ultraviolet rays.

The traditional color change used in the display technology is electrochromism without photochromic technology, the electrochromism needs to be powered on, and the electrochromism cannot be realized under the condition of no current. And the common electrochromic material belongs to liquid state, and is required to be packaged between 2 pieces of materials, and the technical difficulty of adding an ultraviolet-proof film layer on the electrochromic layer is solved.

Therefore, in the present embodiment, the organic photochromic powder is used as the color-changing material, and the ratio of the color-changing solution is adjusted, so that the color-changing layer has a good color-changing effect, and simultaneously, the bonding force with the ultraviolet-proof film layer is good, and the color-changing layer plays a role in color changing and ultraviolet light reflection.

In addition, the traditional inorganic photochromic material is metal oxide such as WO and the like, belongs to photon coloring of inorganic matters, and has longer response time of color change. And the color change response time of the organic photochromic material is shorter. Therefore, the mode of adopting chemical dip-dyeing processes the discoloration layer and has replaced traditional coating mode, on the one hand, has improved machining efficiency, and on the other hand, has shortened the response time that discolours, has promoted the effect that discolours.

The hardening liquid comprises a coupling agent, an episulfide monomer and a catalyst. In one example, the hardening liquid was purchased from CNF corporation, korea. Specifically, the molar percentage of the stiffening liquid in the color-changing solution is 10%, 12%, 15%, 18%, or 20%. The hardening liquid is added into the color-changing solution, so that the bonding force of the color-changing layer and the ultraviolet-proof film layer is improved, and the hardness of the color-changing layer is improved. The hardening liquid has too low mol percentage, which is difficult to improve the bonding force between the color changing layer and the ultraviolet-proof film layer, and the hardening liquid has too high mol percentage, which causes waste.

The alcohol carrier is ethanol, methanol, propanol, etc. Specifically, the molar percentage of the alcohol carrier in the color-changing solution is 70%, 72%, 75%, 78%, or 80%. The alcohol carrier can fully mix the hardening liquid and the organic photochromic powder, so that the photochromic material can be transferred in the alcohol carrier in the drying step, and the photochromic reaction can be normally carried out. The molar percentage of the alcohol carrier is too small, so that the problem of insufficient mixing exists; the molar percentage of the alcohol carrier is too large, which causes waste.

The solvent is ether. For example, the solvent is diethyl ether. The solvent can further thoroughly mix the organic photochromic powder, the hardening liquid and the alcohol vehicle, and it is understood that the solvent may be omitted from the color-changing solution, for example, the solvent may be present in the color-changing solution in a molar percentage of 0, 1, 2, 3, 4 or 5%.

In one embodiment, the color-changing layer has a thickness of 1 μm to 5 μm. Within the thickness range, the color changing layer has good color changing effect. The thickness of the color-changing layer is too thin, and the color-changing effect cannot be achieved.

Furthermore, a coloring agent can be added into the color-changing solution, so that the color-changing layer has an initial color and a color-changing color, and the diversity of colors is increased.

Excessive exposure to uv light can cause skin cancer, and in addition to skin cancer, uv radiation can increase the chances of developing eye problems such as cataracts, macular degeneration, and the like, and destroy the immune system. The working principle of the ultraviolet-proof film layer is that one or more layers of structures are processed on the surface of the substrate in a chemical coating or physical film coating mode to enable ultraviolet light to be absorbed and reflected, and therefore the energy of the ultraviolet light penetrating through the substrate can be reduced.

Specifically, the ultraviolet shielding film layer includes a plurality of high refractive index layers and a plurality of low refractive index layers, which are alternately disposed. The ultraviolet transmittance of the whole ultraviolet-proof film layer is less than or equal to 10 percent. In this embodiment, the uv blocking film layer includes three high refractive index layers and three low refractive index layers, the high refractive index layers being closer to the color changing layer.

In one embodiment, the ultraviolet-proof film layer comprises a first high refractive index layer with the thickness of 5 nm-20 nm, a first low refractive index layer with the thickness of 35 nm-55 nm, a second high refractive index layer with the thickness of 35 nm-55 nm, a second low refractive index layer with the thickness of 10 nm-25 nm, a third high refractive index layer with the thickness of 60 nm-85 nm and a third low refractive index layer with the thickness of 85 nm-110 nm which are sequentially stacked, wherein the first high refractive index layer is closer to the color-changing layer than the third low refractive index layer.

Specifically, the refractive index of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer is 1.8-2.4. In one embodiment, the materials of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer are each independently selected from Ti₃O₅、Nb₂O₅、Si₃N₄And LaTiO₃One kind of (1).

Specifically, the refractive index of the first low refractive index layer, the refractive index of the second low refractive index layer, and the refractive index of the third low refractive index layer are 1.35 to 1.49. In one embodiment, the materials of the first low refractive index layer, the second low refractive index layer and the third low refractive index layer are each independently selected from SiO₂And MgF₂One kind of (1).

Further, the ultraviolet-proof film layer includes: sequentially laminated with a thickness of 8nm and Si as material₃N₄Has a thickness of 45nm and a material of SiO₂A first low refractive index layer of 50nm in thickness and made of Nb₂O₅The second high refractive index layer of (2) has a thickness of 15nm and is made of SiO₂A second low refractive index layer of 68nm thickness and Nb material₂O₅The third high refractive index layer has a thickness of 90nm and is made of SiO₂The first high refractive index layer is closer to the color changing layer than the third low refractive index layer; alternatively, the first and second electrodes may be,

the ultraviolet-proof film layer comprises: the sequentially laminated layers had a thickness of 9nm and a material of Nb₂O₅The first high refractive index layer of (2) has a thickness of 47nm and is made of SiO₂Has a thickness of 48nm and a material of Nb₂O₅The second high refractive index layer of (2) has a thickness of 14nm and is made of SiO₂A second low refractive index layer of 70nm thickness and Nb material₂O₅The third high refractive index layer has a thickness of 95nm and is made of SiO₂The first high refractive index layer is closer to the color changing layer than the third low refractive index layer; alternatively, the first and second electrodes may be,

the ultraviolet-proof film layer comprises: sequentially laminated with a thickness of 10nm and Ti as a material₃O₅The first high refractive index layer of (2) has a thickness of 43nm and is made of SiO₂A first low refractive index layer of 40nm in thickness and made of Ti₃O₅The second high refractive index layer of (2) has a thickness of 10nm and is made of SiO₂A second low refractive index layer of 63nm in thickness and made of Ti₃O₅The third high refractive index layer is 88nm thick and made of SiO₂The first high refractive index layer is closer to the color changing layer than the third low refractive index layer.

General AR film layers are not specially designed for ultraviolet regions, but are mainly designed for high transmittance in the visible region and cannot reflect ultraviolet light. In this embodiment, the uv-blocking film layer has a structure of 6 layers with alternately arranged high refractive index and low refractive index. The ultraviolet-proof film layer can enhance absorption of an ultraviolet region and reflection of the ultraviolet region, most of ultraviolet light passing through the optical composite film can be blocked outside, meanwhile, the ultraviolet-proof film layer can effectively reduce the reflectivity of a visible light region, the passing rate is increased, and the display contrast is increased.

Experiments prove that the ultraviolet-proof film layer of the embodiment can ensure that the transmittance of a visible light region is more than 95% and the transmittance of an ultraviolet region is less than 10%, and effectively improves the contrast effect of images and blocks ultraviolet light.

The optical composite film at least has the following advantages:

above-mentioned optical composite film combines organic photochromic layer and anti ultraviolet rete, through add the stiffened liquid in the solution that discolours, alcohol carrier and the cooperation of organic photochromic powder, make the cohesion of discoloration layer and anti ultraviolet rete good, and the ratio through the solution that discolours of control, make the discoloration effect of discoloration layer good, and then make optical composite film under the strong condition of light, organic photochromic layer can make the highlight weak, reduce the transmissivity to visible light, and simultaneously, absorb the ultraviolet ray, make the transmissivity of ultraviolet ray reduce, avoid causing the injury to the human body. Under the condition of not strong light, the organic photochromic layer can restore the initial state, so that the transmittance of visible light is increased, and the transmittance of ultraviolet light is reduced. Therefore, above-mentioned optical composite film can combine and cohesion is good with discoloration layer and anti ultraviolet rete for optical composite film can be when realizing discolouing, absorbs the ultraviolet ray, can use in intelligent glasses or display device.

A method of preparing an optical composite film according to an embodiment includes the steps of:

mixing the following raw materials in percentage by mole: 2-8% of organic photochromic powder, 10-20% of hardening liquid, 70-80% of alcohol carrier and 0-5% of solvent, and preparing a photochromic solution;

coating a color-changing solution on a substrate, and then drying to form a color-changing layer on the substrate;

and forming an ultraviolet-proof film layer on one side of the color-changing layer far away from the substrate.

In one embodiment, the step of applying the color-changing solution to the substrate and then drying comprises:

dip-dyeing the substrate in the color-changing solution for 2-10 h, and then taking out and drying at 80-100 ℃ for 30-60 min. Through the above steps, the color changing layer can be better bonded to the substrate.

Specifically, the color-changing solution may be coated on the substrate by spray coating or spin coating, and then dried. It can be understood that the discoloring solution is distributed on the substrate in a dip-dyeing mode, the processing efficiency is higher, the waste of the discoloring solution can be avoided, and the practical production requirements are better met. Therefore, in the present embodiment, the color-changing solution is preferably applied to the substrate by dip dyeing.

In addition, according to the requirements of the color-changing product, a color-changing layer can be formed on one surface or two surfaces of the substrate. If the color-changing layer is formed on only one side of the substrate, the other side of the substrate may be protected during the dip-dyeing step.

Specifically, the substrate is made of transparent materials such as glass, PET, PMMA or resin.

In one embodiment, the ultraviolet-proof film layer is formed on the side of the color-changing layer far away from the substrate by vacuum coating. Specifically, the process parameters in the vacuum coating process may be process parameters commonly used in the art, and are not described herein again.

Specifically, the ultraviolet-proof film layer comprises a plurality of high-refractive-index layers and a plurality of low-refractive-index layers, and the high-refractive-index layers and the low-refractive-index layers are alternately stacked. The ultraviolet transmittance of the whole ultraviolet-proof film layer is less than or equal to 10 percent. In this embodiment, the uv blocking film layer includes three high refractive index layers and three low refractive index layers, the high refractive index layers being closer to the color changing layer.

In one embodiment, the ultraviolet-proof film layer comprises a first high refractive index layer with the thickness of 5 nm-20 nm, a first low refractive index layer with the thickness of 35 nm-55 nm, a second high refractive index layer with the thickness of 35 nm-55 nm, a second low refractive index layer with the thickness of 10 nm-25 nm, a third high refractive index layer with the thickness of 60 nm-85 nm and a third low refractive index layer with the thickness of 85 nm-110 nm which are sequentially stacked, wherein the first high refractive index layer is closer to the color-changing layer than the third low refractive index layer.

Specifically, the first high refractive index layer, the second high refractive index layer and the third high refractive index layerThe refractive index is 1.8 to 2.4. In one embodiment, the materials of the first high refractive index layer, the second high refractive index layer and the third high refractive index layer are each independently selected from Ti₃O₅、Nb₂O₅、Si₃N₄And LaTiO₃One kind of (1).

Specifically, the refractive index of the first low refractive index layer, the refractive index of the second low refractive index layer, and the refractive index of the third low refractive index layer are 1.35 to 1.49. In one embodiment, the materials of the first low refractive index layer, the second low refractive index layer and the third low refractive index layer are each independently selected from SiO₂And MgF₂One kind of (1).

The preparation method of the optical composite film at least has the following advantages:

(1) the preparation method of the optical composite film has the advantages of simple process, low cost and easy industrial production.

(2) According to the preparation method of the optical composite film, the organic photochromic layer is combined with the ultraviolet-proof film layer, the hardening liquid is added into the photochromic solution, the alcohol carrier is matched with the organic photochromic powder, the bonding force between the photochromic layer and the ultraviolet-proof film layer is good, the ratio of the photochromic solution is controlled, the photochromic effect of the photochromic layer is good, the optical composite film is made to be strong in light, the organic photochromic layer can weaken strong light, the transmittance of visible light is reduced, and meanwhile, ultraviolet rays are absorbed, the transmittance of ultraviolet rays is reduced, and the harm to a human body is avoided. Under the condition of not strong light, the organic photochromic layer can restore the initial state, so that the transmittance of visible light is increased, and the transmittance of ultraviolet light is reduced. Therefore, above-mentioned optical composite film can combine and cohesion is good with discoloration layer and anti ultraviolet rete for optical composite film can be when realizing discolouing, absorbs the ultraviolet ray, can use in intelligent glasses or display device.

The invention also provides an application of the optical composite film of the embodiment in preparing optical glasses or display devices. Specifically, the optical composite film is the above optical composite film, and is not described herein again.

The invention also provides a display device of an embodiment, which includes a display screen and an optical composite film formed on the display screen, where the optical composite film is the above optical composite film, and details are not repeated here.

The optical composite film is applied to the display device, strong light can be weakened and then enter human eyes, the human eyes and the human body are protected from ultraviolet radiation, meanwhile, the reflectivity of a visible light area can be effectively reduced, the passing rate is increased, and the display contrast is increased.

The following are specific examples:

the substrate used in the following examples was ordinary corning glass with a thickness of 0.5mm to 1.5mm, the organic photochromic powder and the hardening liquid were both available from the Korean CNF company, the solvent was diethyl ether, and the alcohol vehicle was ethanol.

Example 1

The embodiment provides an optical composite film and a preparation method thereof, and the preparation method specifically comprises the following steps:

(1) the composition of the color-changing solution of this example is specifically as follows: the organic photochromic powder is 5 percent by mol, the hardening liquid is 10 percent by mol, the solvent is 5 percent by mol, and the alcohol carrier is 80 percent by mol. And putting the substrate into the color-changing solution for dip dyeing for 3h, taking out and baking for 30min at the temperature of 100 ℃ to combine the color-changing layer with the substrate.

(2) And plating an ultraviolet-proof film layer on the color-changing layer in a vacuum coating mode to obtain the optical composite film of the embodiment. The specific laminated structure of the ultraviolet-proof film layer is as follows in sequence: a first high refractive index layer of Si₃N₄The thickness is 8nm, and the refractive index is 1.8-2.4; a first low refractive index layer made of SiO₂The thickness is 45nm, and the refractive index is 1.35-1.49; a second high refractive index layer made of Nb₂O₅The thickness is 50nm, and the refractive index is 1.8-2.4; a second low refractive index layer made of SiO₂The thickness is 15nm, and the refractive index is 1.35-1.49; a third high refractive index layer made of Nb₂O₅The thickness is 68nm, and the refractive index is 1.8-2.4; a third low refractive index layer made of SiO₂The thickness is 90nm, and the refractive index is 1.35-1.49. The first high refractive index layer is closer to the color changing layer than the third low refractive index layer.

Example 2

The embodiment provides an optical composite film and a preparation method thereof, and the preparation method specifically comprises the following steps:

(1) the composition of the color-changing solution of this example is specifically as follows: the organic photochromic powder is 5 percent by mol, the hardening liquid is 15 percent by mol, the solvent is 2 percent by mol, and the alcohol carrier is 78 percent by mol. And putting the substrate into the color-changing solution for dip dyeing for 3h, taking out and baking for 30min at the temperature of 100 ℃ to combine the color-changing layer with the substrate.

(2) And plating an ultraviolet-proof film layer on the color-changing layer in a vacuum coating mode to obtain the optical composite film of the embodiment. The specific laminated structure of the ultraviolet-proof film layer is as follows in sequence: a first high refractive index layer made of Nb₂O₅The thickness is 9nm, and the refractive index is 1.8-2.4; a first low refractive index layer made of SiO₂The thickness is 47nm, and the refractive index is 1.35-1.49; a second high refractive index layer made of Nb₂O₅The thickness is 48nm, and the refractive index is 1.8-2.4; a second low refractive index layer made of SiO₂The thickness is 14nm, and the refractive index is 1.35-1.49; a third high refractive index layer made of Nb₂O₅The thickness is 70nm, and the refractive index is 1.8-2.4; a third low refractive index layer made of SiO₂The thickness is 95nm, and the refractive index is 1.35-1.49. The first high refractive index layer is closer to the color changing layer than the third low refractive index layer.

Example 3

The embodiment provides an optical composite film and a preparation method thereof, and the preparation method specifically comprises the following steps:

(1) the composition of the color-changing solution of this example is specifically as follows: 8% of organic photochromic powder, 20% of hardening liquid, 0% of solvent and 72% of alcohol carrier. And putting the substrate into the color-changing solution for dip dyeing for 3h, taking out and baking for 30min at the temperature of 100 ℃ to combine the color-changing layer with the substrate.

(2) And plating an ultraviolet-proof film layer on the color-changing layer in a vacuum coating mode to obtain the optical composite film of the embodiment. The specific laminated structure of the ultraviolet-proof film layer is as follows in sequence: a first high refractive index layer made of Ti₃O₅The thickness is 10nm, and the refractive index is 1.8-2.4; first low refractive index layer of material SiO₂The thickness is 43nm, and the refractive index is 1.35-1.49; a second high refractive index layer made of Ti₃O₅The thickness is 40nm, and the refractive index is 1.8-2.4; a second low refractive index layer made of SiO₂The thickness is 10nm, and the refractive index is 1.35-1.49; a third high refractive index layer made of Ti₃O₅The thickness is 63nm, and the refractive index is 1.8-2.4; a third low refractive index layer made of SiO₂The thickness is 88nm, and the refractive index is 1.35-1.49. The first high refractive index layer is closer to the color changing layer than the third low refractive index layer.

Example 4

The embodiment provides an optical composite film and a preparation method thereof, and the preparation method specifically comprises the following steps:

(1) the composition of the color-changing solution of this example is specifically as follows: 8% of organic photochromic powder, 15% of hardening liquid, 2% of solvent and 75% of alcohol carrier. And putting the substrate into the color-changing solution for dip dyeing for 2h, taking out and baking for 30min at the temperature of 100 ℃ to combine the color-changing layer with the substrate.

(2) And plating an ultraviolet-proof film layer on the color-changing layer in a vacuum coating mode to obtain the optical composite film of the embodiment. The specific laminated structure of the ultraviolet-proof film layer is as follows in sequence: the first high refractive index layer is made of LaTiO₃The thickness is 17nm, and the refractive index is 1.8-2.4; first low refractive index layer of MgF₂The thickness is 35nm, and the refractive index is 1.35-1.49; the second high refractive index layer is made of LaTiO₃The thickness is 54nm, and the refractive index is 1.8-2.4; a second low refractive index layer of MgF₂The thickness is 13nm, and the refractive index is 1.35-1.49; the third high refractive index layer is made of LaTiO₃The thickness is 63nm, and the refractive index is 1.8-2.4; a third low refractive index layer of MgF₂The thickness is 103nm, and the refractive index is 1.35-1.49. The first high refractive index layer is closer to the color changing layer than the third low refractive index layer.

Comparative example 1

Comparative example 1 provides an optical composite film and a method for preparing the same, specifically as follows:

(1) the composition of the color-changing solution of comparative example 1 is specifically as follows: the organic photochromic powder is 5 percent by mol, the hardening liquid is 10 percent by mol, the solvent is 5 percent by mol, and the alcohol carrier is 80 percent by mol. And putting the substrate into the color-changing solution for dip dyeing for 3h, taking out and baking for 30min at the temperature of 100 ℃ to combine the color-changing layer with the substrate.

(2) And plating an ultraviolet-proof film layer on the color-changing layer in a vacuum coating mode to obtain the optical composite film of the comparative example 1. The specific laminated structure of the ultraviolet-proof film layer is as follows in sequence: a first high refractive index layer made of Nb₂O₅The thickness is 6nm, and the refractive index is 1.8-2.4; a first low refractive index layer made of SiO₂The thickness is 37nm, and the refractive index is 1.35-1.49; a second high refractive index layer made of Nb₂O₅The thickness is 33nm, and the refractive index is 1.8-2.4; a second low refractive index layer made of SiO₂The thickness is 11nm, and the refractive index is 1.35-1.49; a third high refractive index layer made of Nb₂O₅The thickness is 50nm, and the refractive index is 1.8-2.4; a third low refractive index layer made of SiO₂The thickness is 75nm, and the refractive index is 1.35-1.49. The first high refractive index layer is closer to the color changing layer than the third low refractive index layer.

Comparative example 2

Comparative example 2 provides an optical composite film and a method for preparing the same, specifically as follows:

(1) the composition of the color-changing solution of comparative example 2 is specifically as follows: the organic photochromic powder comprises 1% of organic photochromic powder, 20% of hardening liquid, 5% of solvent and 74% of alcohol carrier in percentage by mass. And putting the substrate material into the color-changing solution for dip dyeing for 3h, taking out and baking for 30min at the temperature of 100 ℃ to combine the color-changing layer with the substrate.

(2) And plating an ultraviolet-proof film layer on the color-changing layer in a vacuum coating mode to obtain the optical composite film. The specific laminated structure of the ultraviolet-proof film layer is as follows in sequence: a first high refractive index layer made of Ti₃O₅The thickness is 10nm, and the refractive index is 1.8-2.4; a first low refractive index layer made of SiO₂The thickness is 43nm, and the refractive index is 1.35-1.49; a second high-refractive-index layer formed on the substrate,the material is Ti₃O₅The thickness is 40nm, and the refractive index is 1.8-2.4; a second low refractive index layer made of SiO₂The thickness is 8nm, and the refractive index is 1.35-1.49; a third high refractive index layer made of Ti₃O₅The thickness is 63nm, and the refractive index is 1.8-2.4; a third low refractive index layer made of SiO₂The thickness is 88nm, and the refractive index is 1.35-1.49. The first high refractive index layer is closer to the color changing layer than the third low refractive index layer.

Comparative example 3

Comparative example 3 provides an optical composite film and a method for preparing the same, similar to the optical composite film and the method for preparing the same of example 1, except that the composition of the color-changing solution is different, specifically as follows:

(1) the composition of the color-changing solution of comparative example 3 is specifically as follows: the organic photochromic powder is 5 percent by mol, the hardening liquid is 5 percent by mol, the solvent is 10 percent by mol, and the alcohol carrier is 80 percent by mol. And putting the substrate into the color-changing solution for dip dyeing for 3h, taking out and baking for 30min at the temperature of 100 ℃ to combine the color-changing layer with the substrate.

(2) And plating an anti-ultraviolet AR film layer on the color-changing layer in a vacuum coating mode to obtain the optical composite film. The specific laminated structure of the ultraviolet-proof film layer is as follows in sequence: a first high refractive index layer made of Nb₂O₅The thickness is 8nm, and the refractive index is 1.8-2.4; a first low refractive index layer made of SiO₂The thickness is 45nm, and the refractive index is 1.35-1.49; a second high refractive index layer made of Nb₂O₅The thickness is 50nm, and the refractive index is 1.8-2.4; a second low refractive index layer made of SiO₂The thickness is 15nm, and the refractive index is 1.35-1.49; a third high refractive index layer made of Nb₂O₅The thickness is 68nm, and the refractive index is 1.8-2.4; a third low refractive index layer made of SiO₂The thickness is 90nm, and the refractive index is 1.35-1.49. The first high refractive index layer is closer to the color changing layer than the third low refractive index layer.

Comparative example 4

Comparative example 4 provides a color-changing layer, similar to the optical composite film of example 1 and the preparation method thereof, except that the uv-blocking film layer is not included, as follows:

the composition of the color-changing solution of comparative example 4 was specifically as follows: the organic photochromic powder is 5 percent by mol, the hardening liquid is 10 percent by mol, the solvent is 5 percent by mol, and the alcohol carrier is 80 percent by mol. And putting the substrate into the color-changing solution for dip dyeing for 3h, taking out and baking for 30min at the temperature of 100 ℃ to combine the color-changing layer with the substrate.

The response time of the discoloration layer, the bonding force between the discoloration layer and the ultraviolet-proof film layer, and the visible light transmittance and ultraviolet light transmittance of the ultraviolet-proof film layer of the optical composite films prepared in the above examples and comparative examples were measured, and the experimental data shown in the following table were obtained. Wherein, the transmittance tester is an ultraviolet visible photometer produced by Shimadzu, Japan, the transmittance is test data before no color change, and the response time of the color changing layer is tested from a starting state to a stable color under sunlight at noon. The bonding force of the color-changing layer and the ultraviolet-proof film layer is tested by adopting a check method.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.