Anti-reflective glare cover plate and method of making same

Abstract

The application discloses an anti-reflection and anti-dazzle cover plate and a preparation method thereof. The anti-reflection and anti-dazzle cover plate comprises a base material with a first surface and a second surface arranged oppositely; a hardening layer arranged on the first surface or the second surface of the base material and formed after pre-solidification and secondary solidification; and an anti-reflection layer arranged on the surface of the hardening layer after pre-solidification to form a concave-convex microstructure with anti-dazzle effect on the hardening layer. The anti-reflection and anti-dazzle cover plate and the preparation method thereof have the anti-reflection and anti-dazzle effect.

Description

Technical Field

[0001] This invention relates to the field of display screen technology, and in particular to an anti-reflective glare cover plate and its preparation method. Background Technology

[0002] Glare refers to visual conditions that cause visual discomfort and reduce the visibility of objects due to unsuitable brightness distribution or extreme brightness contrast in space or time within the visual field. The resulting brightness sensation is unbearable for the human eye, potentially causing aversion, discomfort, or even loss of vision. Glare can impair the eye's contrast perception, visual acuity, and recognition speed, and may also cause keratitis and damage the eyes; it is also a significant cause of visual fatigue.

[0003] Existing methods for achieving anti-glare involve using etching and coating techniques on a glass substrate and UV curing and embossing techniques on a composite board. The anti-glare layer obtained by these conventional techniques has a relatively low Mohs hardness and does not have an anti-reflection effect.

[0004] The present invention was developed to address the aforementioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-reflective glare cover and its preparation method, which has excellent anti-reflective glare effect.

[0006] In view of the above problems, one of the technical solutions provided by the present invention is:

[0007] Anti-reflective glare cover, including:

[0008] A substrate having a first surface and a second surface disposed opposite to each other;

[0009] A hardened layer is disposed on the first or second surface of the substrate and is formed after pre-curing and secondary curing.

[0010] An anti-reflective layer is disposed on the surface of the pre-cured hardened layer to form an anti-glare microstructure on the hardened layer.

[0011] In some embodiments, an antifouling layer is also included, which is disposed on the surface of the antireflective layer after secondary hardening.

[0012] In some embodiments, the antireflective layer includes at least one medium refractive index film layer, at least one high refractive index film layer, and at least one low refractive index film layer, and the film layers are stacked on the hardened layer in the order of medium refractive index film layer, high refractive index film layer, and low refractive index film layer.

[0013] In some embodiments, the refractive index of the medium refractive index film is 1.6 to 1.8 and the thickness is 10 to 20 nm; the refractive index of the high refractive index film is 1.9 to 2.3 and the thickness is 10 to 20 nm; and the refractive index of the low refractive index film is 1.4 to 1.6 and the thickness is 90 to 110 nm.

[0014] Based on the above problems, the second technical solution provided by the present invention is:

[0015] The method for preparing an anti-reflective glare cover plate includes the following steps:

[0016] Step 1: Prepare the curing solution by mixing acrylic resin, monomer, photoinitiator, antioxidant, and diluent.

[0017] Step 2: Apply the hardening solution prepared in Step 1 to the surface of the substrate to prepare a hardened layer;

[0018] Step 3: Pre-cure the substrate coated with the hardening liquid so that the hardness of the hardened layer is less than 1H;

[0019] Step four: Deposit an antireflection layer on the surface of the hardened layer obtained in step three;

[0020] Step 5: Perform a second curing on the substrate for which the antireflection layer was deposited in Step 4;

[0021] Step 6: Spray an anti-fouling layer onto the surface of the anti-reflective layer.

[0022] In some embodiments, the solid content of each component in the curing liquid in step one is: 20%–30% acrylic resin, 1%–8% monomer, 1%–5% photoinitiator, 1%–3% antioxidant, and 60%–70% diluent.

[0023] In some embodiments, in step three, the substrate coated with the hardening liquid is first placed in an oven and baked for a period of time to evaporate the diluent in the hardening liquid, and then the baked substrate is placed in a UV tunnel oven for pre-curing; in step five, the substrate is placed in a UV tunnel oven for secondary curing, wherein the energy of the mercury lamp in the UV tunnel oven is lower than that of the secondary curing during pre-curing.

[0024] In some embodiments, the oven temperature in step three is 60–80°C, and the baking time is 5–10 minutes; during pre-curing, the mercury lamp energy in the UV tunnel oven is kept below 500 mJ / cm². 2 The UV curing time is less than 3 minutes; during the secondary curing, the mercury lamp energy in the UV tunnel oven is kept below 2000-3000 mJ / cm². 2 UV curing time is 3-5 minutes.

[0025] In some embodiments, in step three, the substrate coated with the hardening liquid is placed in an oven and baked for a period of time for pre-curing; in step five, the substrate is placed in an oven and baked for a period of time for secondary curing, wherein the secondary curing time is longer than the pre-curing time.

[0026] In some of these embodiments, the oven temperature during pre-curing is 80℃~120℃ and the baking time is 20~30min; the oven temperature during secondary curing is 80℃~120℃ and the baking time is 120~150min.

[0027] Compared with the prior art, the advantages of the present invention are:

[0028] A hardening layer is coated on the substrate surface. After the hardening layer is pre-cured, an anti-reflective layer is deposited. Because the anti-reflective layer has high stress and the pre-cured hardening layer has low hardness, and the two have different coefficients of expansion, the hardening layer will stretch and wrinkle when the stress on the hardened surface is released. This results in a micro-uneven structure in the hardening layer, achieving the anti-glare effect. After secondary curing, the entire cover plate has high hardness and abrasion resistance. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an embodiment of the anti-reflective glare cover plate of the present invention;

[0031] in:

[0032] 1. Substrate;

[0033] 2. Hardened layer;

[0034] 3. Antireflective layer; 3-1. Medium refractive index film; 3-2. High refractive index film; 3-3. Low refractive index film;

[0035] 4. Anti-fouling layer. Detailed Implementation

[0036] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0037] like Figure 1As shown, the present invention provides an anti-reflective glare cover plate, comprising a substrate 1, and a hardening layer 2, an anti-reflective layer 3, and an anti-fouling layer 4 sequentially disposed on the substrate 2.

[0038] Substrate 1 is a transparent composite board with a first surface and a second surface arranged opposite to each other. Hardening layer 2 is applied to either the first or second surface of substrate 1 and is formed through pre-curing and secondary curing. Anti-reflective layer 3 is applied to the pre-cured surface of hardening layer 2 to form an anti-glare microstructure on the hardened layer 2. Anti-fouling layer 4 is applied to the secondary-cured surface of anti-reflective layer 3 and is made of fluoride.

[0039] The antireflection layer 3 includes at least one medium refractive index film layer 3-1, at least one high refractive index film layer 3-2, and at least one low refractive index film layer 3-3, and each film layer is stacked on the hardened layer 2 in the order of medium refractive index film layer 3-1, high refractive index film layer 3-2, and low refractive index film layer 3-3.

[0040] In this example, the antireflective layer 3 has a three-layer structure, comprising a medium refractive index film 3-1, a high refractive index film 3-2, and a low refractive index film 3-3, sequentially stacked on the hardened layer 2. The medium refractive index film 3-1 has a refractive index of 1.6–1.8 and a thickness of 10–20 nm; the high refractive index film 3-2 has a refractive index of 1.9–2.3 and a thickness of 10–20 nm; and the low refractive index film 3-3 has a refractive index of 1.4–1.6 and a thickness of 90–110 nm. Specifically, the medium refractive index film 3-1 is an Al₂O₃ film, the high refractive index film 3-2 is a Nb₂O₅ film, and the low refractive index film 3-3 is a SiO₂ film.

[0041] The above-mentioned method for preparing the anti-glare cover plate includes the following steps:

[0042] Step 1: Prepare the curing solution by mixing acrylic resin, monomer, photoinitiator, antioxidant, and diluent.

[0043] Step 2: Apply the hardening solution prepared in Step 1 to the surface of the substrate to prepare a hardened layer;

[0044] Step 3: Pre-cure the substrate coated with the hardening liquid so that the hardness of the hardened layer is less than 1H;

[0045] Step four: Deposit an antireflection layer on the surface of the hardened layer obtained in step three;

[0046] Step 5: Perform a second curing on the substrate for which the antireflection layer was deposited in Step 4;

[0047] Step 6: Spray an anti-fouling layer onto the surface of the anti-reflective layer.

[0048] The solid content of each component in the hardening solution in step one is as follows: 20%–30% acrylic resin, 1%–8% monomer, 1%–5% photoinitiator, 1%–3% antioxidant, and 60%–70% diluent. The monomers are acrylates with different functional groups, used to increase the curing speed. Photoinitiator 184 absorbs ultraviolet radiation energy during curing to form free radicals or cations, initiating polymerization, crosslinking, and grafting reactions between monomers and oligomers, thus curing them into a three-dimensional network polymer in a very short time. Antioxidant 1010 is used to improve the anti-aging properties of HC.

[0049] In one embodiment, in step three, the substrate coated with the hardening liquid is first baked in an oven at 60–80°C for 5–10 minutes to evaporate the diluent in the hardening liquid. Then, the baked substrate is placed in a UV tunnel oven for pre-curing. During pre-curing, the mercury lamp energy of the UV tunnel oven is kept below 500 mJ / cm². 2 The UV curing time is less than 3 minutes; in step five, the substrate is placed in a UV tunnel oven for secondary curing, and the mercury lamp energy of the UV tunnel oven is kept below 2000-3000 mJ / cm during the secondary curing. 2 UV curing time is 3-5 minutes.

[0050] The purpose of pre-curing is to evaporate the diluent in the curing solution and allow the resin material to cure, forming a hardened layer. Pre-curing uses lower curing energy, resulting in a softer hardened layer. When an anti-reflective layer is then layered on top, the higher hardness of the anti-reflective layer, combined with the difference in their coefficients of thermal expansion, causes stress release in the anti-reflective layer, leading to stretching and wrinkling of the softer hardened layer. This results in a micro / nano structure with anti-glare properties. The hardness of the pre-cured hardened layer is 1B–1H, and its thickness is 3–15μm. Because the pre-cured hardened layer is relatively soft, the resulting layer has a lower hardness. Therefore, after a second curing process, the hardness of the hardened layer increases from less than 1H to 3H, making the hardness of the anti-reflective glare cover greater than 3H.

[0051] The interaction between the hardening layer and the antireflective layer creates an uneven microstructure on the film surface, increasing the diffuse reflection of light and thus providing excellent anti-glare effect.

[0052] In another embodiment, in step three, the substrate coated with the hardening liquid is placed in an oven and baked for a period of time for pre-curing; in step six, the substrate is placed in an oven and baked for a period of time for secondary curing, wherein the secondary curing time is longer than the pre-curing time. Specifically, the oven temperature for pre-curing is 80℃~120℃, and the baking time is 20~30min; the oven temperature for secondary curing is 80℃~120℃, and the baking time is 120~150min.

[0053] In step four, the pre-cured composite board substrate is placed in a vacuum coating chamber. Under vacuum conditions, after plasma cleaning, a medium refractive index film, a high refractive index film, and a low refractive index film are deposited sequentially.

[0054] The deposition process of the medium refractive index film is as follows: the aluminum target material is supplied with sputtering gas and reflective gas at a power of 5 kW. The sputtering gas is argon and the reactant gas is oxygen. The argon flow rate is 100 sccm and the oxygen flow rate is controlled by Speedflo software, with a flow rate range of 20 to 80 sccm. The substrate with the hardened layer is deposited by passing through the aluminum target at a transmission speed of 0.5 m / min. After deposition, an Al2O3 film with a refractive index of 1.6 to 1.8 is formed.

[0055] The deposition process of the high refractive index film is as follows: the niobium target material is supplied with sputtering gas and reflective gas at a power of 5 kW. The sputtering gas is argon and the reactant gas is oxygen. The flow rate of argon is 100 sccm and the flow rate of oxygen is 40 sccm. The substrate with the hardened layer is deposited by passing through the niobium target at a transmission speed of 0.5 m / min. After deposition, a Nb2O5 film with a refractive index of 1.9 to 2.3 is formed.

[0056] The deposition process of the low refractive index film is as follows: the silicon target material is supplied with sputtering gas and reflective gas at a power of 18 kW. The sputtering gas is argon and the reaction gas is oxygen. The flow rate of argon is 100 sccm and the flow rate of oxygen is 100 sccm. The substrate with the hardened layer is deposited by passing through the niobium target at a transmission speed of 0.5 m / min. After deposition, a SiO2 film with a refractive index of 1.4 to 1.6 is formed.

[0057] Several points were selected on the cover plate, and the surface roughness at each point was tested to be 0.058 μm, 0.049 μm, 0.048 μm, and 0.036 μm, which meets the surface roughness requirements (Ra 0.02 μm ~ 0.08 μm) for the anti-glare film layer. The anti-glare microstructure height H > 10 nm, the particle size of the surface peaks > 2 nm, the static friction force Us of the film layer surface meets 0.05 ~ 0.15 N, and the dynamic friction force Ud of the film layer surface meets 0.05 ~ 0.15 N.

[0058] In summary, this cover plate has anti-glare and anti-reflection effects, and also has high hardness and abrasion resistance.

[0059] The above examples are merely illustrative of the technical concept and features of the present invention, intended to enable those skilled in the art to understand the content of the invention and implement it accordingly, and should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing an anti-reflective glare cover, characterized in that, Includes the following steps: Step 1: Prepare the curing solution by mixing acrylic resin, monomer, photoinitiator, antioxidant and diluent by stirring. The monomer is an acrylate with different functional groups. Step 2: Apply the hardening solution prepared in Step 1 to the surface of the substrate to prepare a hardened layer; Step 3: Pre-cure the substrate coated with the hardening liquid so that the hardness of the hardened layer is less than 1H; Step 4: Deposit an antireflection layer on the surface of the hardened layer obtained in step 3. The antireflection layer has a large stress, while the hardened layer after pre-curing has a small hardness. The two have different coefficients of expansion. The stress release of the antireflection layer causes the hardened layer after pre-curing to stretch and wrinkle to form a micro-nano structure. Step 5: Perform a second curing on the substrate for which the antireflection layer was deposited in Step 4; Step 6: Spray an anti-fouling layer onto the surface of the anti-reflective layer.

2. The method for preparing the anti-reflective glare cover plate according to claim 1, characterized in that: The solid content of each component in the hardening liquid in step one is: 20%–30% acrylic resin, 1%–8% monomer, 1%–5% photoinitiator, 1%–3% antioxidant, and 60%–70% diluent.

3. The method for preparing the anti-reflective glare cover plate according to claim 1, characterized in that: In step three, the substrate coated with the hardening liquid is first placed in an oven and baked for a period of time to evaporate the diluent in the hardening liquid. Then, the baked substrate is placed in a UV tunnel oven for pre-curing. In step five, the substrate is placed in a UV tunnel oven for secondary curing. During pre-curing, the energy of the mercury lamp in the UV tunnel oven is lower than that during secondary curing.

4. The method for preparing the anti-reflective glare cover plate according to claim 3, characterized in that: In step three, the oven temperature is 60–80℃, and the baking time is 5–10 minutes; during pre-curing, the mercury lamp energy in the UV tunnel oven is kept below 500 mJ / cm². 2 UV curing time is less than 3 minutes; during secondary curing, the mercury lamp energy in the UV tunnel oven is kept below 2000-3000 mJ / cm². 2 UV curing time is 3-5 minutes.

5. The method for preparing the anti-reflective glare cover plate according to claim 1, characterized in that: In step three, the substrate coated with the hardening liquid is placed in an oven and baked for a period of time for pre-curing; in step five, the substrate is placed in an oven and baked for a period of time for secondary curing, wherein the time for secondary curing is longer than that for pre-curing.

6. The method for preparing the anti-reflective glare cover plate according to claim 5, characterized in that: During pre-curing, the oven temperature is 80℃~120℃ and the baking time is 20~30min; during secondary curing, the oven temperature is 80℃~120℃ and the baking time is 120~150min.

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