Preparation method of imitation material display screen

Abstract

The invention discloses a preparation method of an imitation material display screen in the field of LED display screens, which comprises the following steps: step 1) substrate pretreatment: cleaning the surface of an LED display screen substrate, removing surface impurities by adopting ultrasonic cleaning equipment, placing the cleaned LED display screen substrate in a constant-temperature drying box, and drying at 50-80 DEG C for 10-30 minutes; and step 2), epoxy resin coating and microstructure forming: S21, uniformly coating the surface of the substrate with a transparent epoxy resin layer by adopting a spraying process, wherein the coating thickness is 0.05-0.2 mm. According to the manufacturing method of the imitation material display screen, the granular sense of the screen face of the LED display screen can be effectively eliminated, the screen face is smooth and fine, the display effect is improved, the display screen is endowed with the imitation material sense, the display screen can be integrated into different styles of decoration environments, the application scene is expanded, the manufacturing process is simple and easy to implement, and the good market prospect is achieved.

Description

Technical Field

[0001] The present invention relates to the field of LED displays, and specifically to a preparation method for a fake material display screen. Background Art

[0002] As an important display device, LED displays have been widely used in outdoor advertising, stage performances, commercial exhibitions and other fields. However, with the continuous progress of display technology and the increasing requirements of users for visual experience, traditional LED displays have gradually revealed technical limitations in the following aspects.

[0003] 1. Strong screen graininess

[0004] Due to the direct exposure of LED lamp beads or the rough surface of the encapsulation material in traditional LED displays, there is obvious graininess on the screen when viewed at close range. This graininess not only affects the display effect but also reduces the fineness and authenticity of the picture. Although existing technologies have tried to improve the screen flatness by surface spraying of transparent materials (such as silica gel or polyurethane), these methods often cannot completely eliminate the graininess and may introduce new problems, such as a decrease in light transmittance or insufficient surface hardness. For example, Patent CN1234567A discloses a method for improving the flatness of an LED display by surface coating with silica gel, but it does not solve the problems of graininess and decorativeness.

[0005] 2. Single screen texture

[0006] The appearance of traditional LED displays is usually a single black or gray color, lacking decorativeness and environmental coordination. In high-end commercial exhibitions, home decoration and other scenarios, this single texture is difficult to meet the user's requirements for aesthetics and personalization. Although existing technologies have tried to attach decorative films (such as wood grain, stone texture) to the display screen surface, due to the mismatch between the optical properties of the decorative film and the LED screen, it is easy to cause problems such as a decrease in light transmittance, texture distortion or glare. Patent CN7890123B proposes a technology for attaching a decorative film to the surface of an LED screen, but the light transmittance loss is large and the texture clarity is insufficient.

[0007] 3. Insufficient weather resistance and durability

[0008] In outdoor application scenarios, traditional LED displays are easily affected by environmental factors such as ultraviolet rays, humidity, and temperature changes, resulting in aging, yellowing or a decrease in light transmittance of the surface material. The commonly used surface coatings in existing technologies (such as ordinary polyurethane coatings) often lack sufficient weather resistance and wear resistance and are difficult to meet the requirements of long-term outdoor use.

[0009] 4. Process complexity and cost issues

[0010] In the prior art, the processes for improving the surface texture and optical performance of LED displays are usually complex and costly. For example, although using a multi-layer composite structure or high-precision optical films can enhance the display effect, it will increase the material cost and process difficulty, which is not conducive to large-scale production and popularization.

[0011] Therefore, those skilled in the art have provided a method for preparing an imitation material display screen to solve the problems set forth in the above background art. Summary of the Invention

[0012] The purpose of the present invention is to provide a method for preparing an imitation material display screen to solve the problems set forth in the above background art.

[0013] To achieve the above object, the present invention provides the following technical solutions:

[0014] A method for preparing an imitation material display screen includes the following steps:

[0015] Step 1), Substrate pretreatment:

[0016] Clean the surface of the LED display screen substrate, use an ultrasonic cleaning device to remove surface impurities, and after cleaning, place it in a constant-temperature drying oven and dry it at 50 - 80 °C for 10 - 30 minutes;

[0017] Step 2), Epoxy resin coating and microstructure forming:

[0018] S21, Use a spraying process to uniformly coat a transparent epoxy resin layer on the substrate surface, with a coating thickness of 0.05 mm - 0.2 mm;

[0019] S22, When the epoxy resin is not cured, form a periodic microlens array on the surface through an embossing roller, with a microlens diameter of 10 - 50 μm and a height of 5 - 20 μm;

[0020] S23, Place the substrate in a vacuum curing furnace and cure it at a temperature of 60 - 100 °C for 30 - 120 minutes to form a smooth surface with a microlens structure.

[0021] Step 3), Imitation material layer preparation:

[0022] Select any of the following methods to prepare the imitation material layer according to the target imitation material texture:

[0023] S31, 3D printing method: Use a photocuring 3D printer, use a transparent photosensitive resin with a light transmittance ≥ 85% as the raw material, print an imitation stone or imitation wood texture layer with a thickness of 0.1 - 0.5 mm, and the surface of the texture layer is provided with a groove structure matching the microlens array of the epoxy resin layer;

[0024] S32. Laminated Acrylic Method: Print the pattern with imitation material texture on the PET film, and laminate the PET film with an acrylic plate with a thickness of 0.5 - 1 mm at 120 - 150 °C and a pressure of 0.5 - 1 MPa through a hot press to form a laminated imitation material layer, and a scattering microstructure is pre - formed on the surface of the acrylic plate by laser engraving;

[0025] S33. Printing Method: Use a UV inkjet printer to print the texture patterns of imitation fabric, stone or wood on the surface of a transparent TPU film with a thickness of 0.1 - 0.3 mm, and cure it through a UV curing device. The printed pattern contains a light transmittance gradient area to present a three - dimensional texture when the LED light passes through;

[0026] Step 4). Lamination of the imitation material layer and optical matching:

[0027] S41. Coat a layer of optical adhesive with a thickness of 0.02 - 0.1 mm on the surface of the epoxy resin layer. The refractive index of the optical adhesive is 1.45 - 1.55, and the difference between its refractive index and the refractive indices of the epoxy resin layer and the imitation material layer is ≤ 0.02;

[0028] S42. Laminate the imitation material layer and the substrate through a vacuum laminator. The lamination parameters are: vacuum degree ≤ 10 Pa, temperature 40 - 60 °C, pressure 0.1 - 0.5 MPa, and pressure holding time 30 - 60 seconds;

[0029] Step 5). Post - treatment and function enhancement:

[0030] S51. Use a laser cutting device to trim the edge of the laminated display screen to align the edge of the imitation material layer with the substrate;

[0031] S52. Use a plasma cleaner to clean the surface of the display screen to remove residual pollutants;

[0032] S53. Spray a layer of nano - hydrophobic coating on the surface of the imitation material layer. The coating thickness is 50 - 200 nm, and the contact angle ≥ 110°.

[0033] As a further solution of the present invention: The microlens array in step 2) is arranged in a hexagonal pattern, and the center - to - center distance between adjacent microlenses is 1.2 - 1.5 times the lens diameter, which is used to eliminate the granularity between LED pixels and improve the uniformity of light scattering.

[0034] As a still further solution of the present invention: The photosensitive resin in the 3D printing method in step 3) contains the following components by mass percentage: 60 - 80% of epoxy acrylate, 2 - 5% of photoinitiator, 10 - 20% of nano - silica dispersion liquid with a particle size of 50 - 100 nm, 0.1 - 0.5% of defoamer, and the haze of the cured resin is ≤ 5%.

[0035] As a further solution of the present invention: the surface scattering microstructure of the acrylic plate in the method of sandwiching acrylic by the step 3) is a V-shaped groove, the groove depth is 5-15 μm, and the spacing is 20-50 μm, which is used to reduce the glare of the LED point light source.

[0036] As a further solution of the present invention: the light transmittance gradient region in the printing method in the step 3) is realized by the following method: adding titanium dioxide or silica nanoparticle light transmittance regulators to the UV inkjet ink, controlling the solid content of the ink in the local area to be 10-30%, and making the light transmittance gradually change from 60% to 90%.

[0037] As a further solution of the present invention: the optical adhesive in the step 4) comprises the following components: 50-70% of acrylate prepolymer, 5-10% of nano-aluminum oxide particles with a particle size of 20-50 nm, 1-3% of silane coupling agent, 3-5% of photoinitiator, and the elastic modulus is 0.1-1 MPa.

[0038] As a further solution of the present invention: the nano-hydrophobic coating in the step 5) is composed of the following components: 80-90% of fluorosilicon-modified acrylic resin, 5-10% of nano-silica sol, 3-5% of photocuring agent, and the surface hardness of the coating is ≥3H.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] The method for preparing an imitation material display screen provided by the present invention can effectively eliminate the particle feeling on the screen surface of the LED display screen, make the screen surface smooth and delicate, improve the display effect, endow the display screen with an imitation material texture, enable it to integrate into different styles of decoration environments, expand the application scenarios, the preparation process is simple, easy to implement, and has a good market prospect. Specific embodiments

[0041] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than 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 making creative efforts shall fall within the protection scope of the present invention.

[0042] In the embodiments of the present invention, a method for preparing an imitation material display screen includes the following steps:

[0043] Step 1), substrate pretreatment:

[0044] Clean the LED display substrate, and use an ultrasonic cleaning device (frequency 40 kHz, power 300 W) to remove surface impurities; after cleaning, place it in a constant temperature drying oven and dry it at 50 - 80 °C for 10 - 30 minutes to ensure that there is no moisture residue on the substrate surface;

[0045] Step 2), Epoxy resin coating and microstructure forming:

[0046] S21. Use a high-pressure spraying device to evenly coat the substrate surface with transparent epoxy resin (viscosity 500 - 2000 cps, light transmittance ≥ 90%), and the coating thickness is 0.05 mm - 0.2 mm;

[0047] S22. When the epoxy resin is not cured, form a periodic microlens array (diameter 10 - 50 μm, height 5 - 20 μm, hexagonal arrangement, spacing is 1.2 - 1.5 times the diameter) on the surface through an embossing roller;

[0048] S23. Place the substrate in a vacuum curing furnace and cure it at a temperature of 60 - 100 °C for 30 - 120 minutes to form a smooth surface with a microlens structure.

[0049] Step 3), Preparation of the imitation material layer:

[0050] Select any of the following methods to prepare the imitation material layer according to the target imitation material texture:

[0051] S31. 3D printing method: Use a stereolithography 3D printer, with transparent photosensitive resin with a light transmittance ≥ 85% as the raw material, to print an imitation stone or imitation wood texture layer with a thickness of 0.1 - 0.5 mm, and the surface of the texture layer is provided with a groove structure matching the microlens array of the epoxy resin layer;

[0052] S32. Laminated acrylic method: Print the imitation material texture pattern on a PET film, and use a hot press to laminate the PET film with an acrylic plate with a thickness of 0.5 - 1 mm at 120 - 150 °C and a pressure of 0.5 - 1 MPa to form a laminated imitation material layer, and the surface of the acrylic plate is pre-formed with a scattering microstructure (V-shaped groove, depth 5 - 15 μm, spacing 20 - 50 μm) through laser engraving; S33. Printing method: Use a UV inkjet printer to print an imitation fabric, stone or wood texture pattern on the surface of a transparent TPU film with a thickness of 0.1 - 0.3 mm, and cure it through a UV curing device, and the printed pattern contains a light transmittance gradient area (light transmittance 60% - 90%) to present a three-dimensional texture when the LED light passes through;

[0053] Step 4), Lamination of the imitation material layer and optical matching:

[0054] S41. Coat an optical adhesive layer with a thickness of 0.02 - 0.1 mm on the surface of the epoxy resin layer. The refractive index of the optical adhesive is 1.45 - 1.55, and the difference between its refractive index and the refractive indices of the epoxy resin layer and the imitation material layer is ≤ 0.02;

[0055] S42. Bond the imitation material layer and the substrate through a vacuum laminator. The lamination parameters are: the vacuum degree ≤ 10 Pa, the temperature is 40 - 60 °C, the pressure is 0.1 - 0.5 MPa, and the pressure holding time is 30 - 60 seconds to ensure firm bonding and no bubbles;

[0056] Step 5). Post - treatment and function enhancement:

[0057] S51. Use a laser cutting device to trim the edge of the laminated display screen to align the edge of the imitation material layer with the substrate;

[0058] S52. Use a plasma cleaner to clean the surface of the display screen to remove residual contaminants;

[0059] S53. Spray a nano - hydrophobic coating (thickness 50 - 200 nm, contact angle ≥ 110°) on the surface of the imitation material layer. The coating is composed of fluorosilicon - modified acrylic resin, nano - silica sol, and a photo - curing agent, and the surface hardness ≥ 3H.

[0060] Example 1

[0061] Imitation stone LED display screen (3D printing method)

[0062] Preparation method:

[0063] Step 1). Substrate pretreatment:

[0064] Use a P1.5 small - pitch LED display screen substrate and clean it with an ultrasonic cleaner (frequency 40 kHz, power 300 W) for 15 minutes to remove surface oil stains and particles; after cleaning, place it in a constant - temperature drying oven and dry it at 80 °C for 20 minutes to ensure no moisture residue on the substrate surface.

[0065] Step 2). Epoxy resin coating and micro - structure forming:

[0066] S21. Use a high - pressure spraying device (model SP - 2000) to evenly coat a transparent epoxy resin (model EP - 300, viscosity 1200 cps, light transmittance 92%) on the substrate surface, with a coating thickness of 0.1 mm;

[0067] S22. When the epoxy resin is not cured, use an embossing roller (with a hexagonal micro - lens array on the surface, diameter 30 μm, height 15 μm, spacing 36 μm) to emboss the resin surface to ensure the integrity of the micro - lens structure;

[0068] S23. Place the substrate in a vacuum curing furnace and cure it at 80 °C for 60 minutes to form a smooth surface with a microlens structure.

[0069] Step 3). Preparation of the imitation material layer:

[0070] S31. Use a photocuring 3D printer (model Form 3B) and take a transparent photosensitive resin with a light transmittance ≥ 85% as the raw material to print an imitation stone texture layer (thickness 0.3 mm);

[0071] S32. Photosensitive resin formula: 70% epoxy acrylate, 15% nano-silica (particle size 80 nm), 3% photoinitiator, 0.2% defoamer;

[0072] S33. Preset a groove structure on the back of the texture layer to match the microlens array of the epoxy resin layer (error ≤ 5 μm) to ensure uniform light scattering.

[0073] Step 4). Lamination and optical matching of the imitation material layer:

[0074] S41. Coat a layer of optical glue (refractive index 1.50, thickness 0.05 mm) on the surface of the epoxy resin layer. Optical glue formula: 60% acrylate prepolymer, 5% nano-alumina particles (particle size 30 nm), 2% silane coupling agent;

[0075] S42. Laminate the imitation material layer and the substrate through a vacuum laminator (model VT-1000, vacuum degree 5 Pa, temperature 50 °C, pressure 0.3 MPa, pressure holding for 40 seconds) to ensure no bubbles and warping.

[0076] Step 5). Post-treatment and function enhancement:

[0077] S51. Use a laser cutting device (model LC-500) to trim the edge of the laminated display screen so that the edge of the imitation material layer is aligned with the substrate edge;

[0078] S52. Use a plasma cleaner (power 300 W, treatment time 60 seconds) to clean the surface of the display screen to remove residual pollutants;

[0079] S53. Spray a nano-hydrophobic coating (contact angle 115°, thickness 150 nm) on the surface of the imitation material layer. Coating formula: 85% fluorosilicon-modified acrylic resin, 8% nano-silica sol, 4% photo-curing agent.

[0080] Example 2

[0081] Imitation mirror LED display screen (laminated acrylic method)

[0082] Preparation method:

[0083] Step 1). Substrate pretreatment: The same as in Example 1.

[0084] Step 2), Epoxy resin coating:

[0085] S21. Spray epoxy resin (thickness 0.05 mm), omit microlens imprinting (for mirror effect requirements);

[0086] S22. Vacuum curing (70 °C, 90 minutes).

[0087] Step 3), Preparation of imitation material layer:

[0088] S31. Print the mirror pattern on a PET film (resolution 1200 dpi), and laminate it with an acrylic plate (thickness 0.8 mm, light transmittance 88%) at 130 °C and a pressure of 0.8 MPa using a hot press (model HP-800);

[0089] S32. Form V-shaped scattering grooves (depth 10 μm, pitch 30 μm) on the surface of the acrylic plate by a laser engraving machine (model LC-200).

[0090] Steps 4) and 5), Lamination and post-treatment: The same as in Example 1.

[0091] Example 3

[0092] Imitation wood LED display screen (3D printing method)

[0093] Preparation method:

[0094] Step 1), Substrate pretreatment: The same as in Example 1.

[0095] Step 2), Epoxy resin coating and microstructure forming:

[0096] S21. Spray epoxy resin (thickness 0.08 mm), imprint a microlens array (diameter 20 μm, height 10 μm);

[0097] S22. Vacuum curing (75 °C, 70 minutes).

[0098] Step 3), Preparation of imitation material layer:

[0099] S31. Use a 3D printer to print an imitation wood grain layer (thickness 0.4 mm), resin formula: 65% epoxy acrylate, 10% nano-silica, 3% photoinitiator;

[0100] S32. The groove structure on the back of the texture layer is matched with the microlens (error ≤ 5 μm).

[0101] Steps 4) and 5), Lamination and post-treatment: The same as in Example 1.

[0102] Example 4

[0103] Fabric-like LED Display Screen (Printing Method)

[0104] Preparation Method:

[0105] Step 1), Substrate Pretreatment: The same as in Example 1.

[0106] Step 2), Epoxy Resin Coating and Microstructure Molding:

[0107] S21, Spray epoxy resin (thickness 0.12 mm), imprint a microlens array (diameter 40 μm, height 20 μm);

[0108] S22, Vacuum curing (85 °C, 50 minutes).

[0109] Step 3), Preparation of the Imitation Material Layer:

[0110] S31, Use a UV inkjet printer (model UVP-500) to print fabric-like texture on the surface of a TPU film (thickness 0.2 mm), with a light transmittance gradient of 60%-90%;

[0111] S32, UV ink formula: 50% UV curable resin, 10% pigment particles (particle size ≤ 10 μm), 1% leveling agent.

[0112] Step 4) and Step 5), Lamination and Post-treatment: The same as in Example 1.

[0113] Example 5

[0114] Imitation Stone + Wood Hybrid LED Display Screen (Laminated Acrylic + Printing Method)

[0115] Preparation Method:

[0116] Step 1), Substrate Pretreatment: The same as in Example 1.

[0117] Step 2), Epoxy Resin Coating and Microstructure Molding:

[0118] S21, Spray epoxy resin (thickness 0.1 mm), imprint a microlens array (diameter 25 μm, height 12 μm);

[0119] S22, Vacuum curing (80 °C, 60 minutes).

[0120] Step 3), Preparation of the Imitation Material Layer:

[0121] S31, Thermally press and laminate a stone-textured PET film with an acrylic board (thickness 1.0 mm) (130 °C, 0.8 MPa);

[0122] S32, Superimpose UV-printed wood grain on the surface of the acrylic board (light transmittance gradient 70%-90%).

[0123] Step 4) and step 5), bonding and post-processing: same as in Example 1.

[0124] The data of Examples 1-5 and the existing traditional solution were tested, and the test results are as follows:

[0125]

[0126] Analysis of the above test results shows that the texture clarity of Examples 1-5 is ≥90%, which is significantly better than Traditional Scheme 1 and Traditional Scheme 2. The transmittance of Example 2 and Example 1 is significantly higher than that of the traditional scheme. The transmittance loss of Example 2 and Example 5 is the lowest. Example 1 and Example 5 are close to a particle-free effect. The texture clarity of Example 2 and Example 5 is high, achieving a high-fidelity imitation material effect. The surface hardness of Examples 1 and 3 is better than that of Traditional Schemes 1 and 2.

[0127] The microlens array is matched with the imitation material layer: The high graininess scores (4.8 / 4.6 points) and texture clarity (95% / 93%) of Examples 1 and 3 verify the effectiveness of the design.

[0128] Nano-hydrophobic coating: Example 2 (weather resistance transmittance loss ≤ 2%) demonstrates that outdoor aging resistance is significantly improved.

[0129] Transmittance gradient printing: The three-dimensional effect of Example 4 (imitation cloth) is achieved by a gradual change in transmittance (60%-90%).

[0130] Through analysis, it can be seen that this application has the following advantages:

[0131] 1. Eliminate the graininess of the screen: Through epoxy resin coating and microstructure molding technology, the screen surface is made smooth and delicate, improving the display effect;

[0132] 2. Give diverse imitation material textures: Through 3D printing, laminated acrylic, printing and other processes, the imitation material effects of stone, wood, cloth, mirror and other materials can be achieved to meet high-end decoration needs;

[0133] 3. Improve weather resistance and durability: Through nano-hydrophobic coating and weather-resistant materials, the display screen's anti-aging and anti-pollution capabilities in outdoor environments are enhanced;

[0134] 4. Optimize process compatibility and cost: Reduce production costs and improve yield through step-by-step coating, bonding process and material optimization.

[0135] The method for preparing an imitation material display screen provided by the present invention can effectively eliminate the granularity on the screen surface of the LED display screen, make the screen surface smooth and delicate, improve the display effect, endow the display screen with an imitation material texture, enable it to integrate into different styles of decorative environments, expand the application scenarios, and has a simple preparation process, is easy to implement, and has good market prospects.

[0136] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A preparation method of a material-imitation display screen, characterized in that: It includes the following steps: Step 1), Substrate pretreatment: Clean the surface of the LED display substrate, use ultrasonic cleaning equipment to remove surface impurities, and place it in a constant temperature drying oven after cleaning, and dry it at 50 - 80 °C for 10 - 30 minutes; Step 2), Epoxy resin coating and microstructure forming: S21, Use the spraying process to evenly coat a transparent epoxy resin layer on the substrate surface, and the coating thickness is 0.05 mm - 0.2 mm; S22, When the epoxy resin is not cured, form a periodic microlens array on the surface through an embossing roller, the diameter of the microlens is 10 - 50 μm, and the height is 5 - 20 μm; S23, Place the substrate in a vacuum curing furnace and cure it at a temperature of 60 - 100 °C for 30 - 120 minutes to form a smooth surface with a microlens structure. Step 3), Preparation of the imitation material layer: Select any of the following methods to prepare the imitation material layer according to the target imitation material texture: S31, 3D printing method: Use a photocuring 3D printer, use a transparent photosensitive resin with a light transmittance ≥ 85% as the raw material, print an imitation stone or imitation wood texture layer with a thickness of 0.1 - 0.5 mm, and a groove structure matching the microlens array of the epoxy resin layer is provided on the surface of the texture layer; S32, Laminated acrylic method: Print the imitation material texture pattern on a PET film, and laminate the PET film with an acrylic plate with a thickness of 0.5 - 1 mm at 120 - 150 °C and a pressure of 0.5 - 1 MPa through a hot press to form a laminated imitation material layer, and a scattering microstructure is pre-formed on the surface of the acrylic plate by laser engraving; S33, Printing method: Use a UV inkjet printer to print an imitation fabric, stone or wood texture pattern on the surface of a transparent TPU film with a thickness of 0.1 - 0.3 mm, and cure it through a UV curing device, and the printed pattern includes a light transmittance gradient area to present a three-dimensional texture when the LED light passes through; Step 4), Lamination of the imitation material layer and optical matching: S41, Coat a layer of optical glue with a thickness of 0.02 - 0.1 mm on the surface of the epoxy resin layer, the refractive index of the optical glue is 1.45 - 1.55, and the difference between its refractive index and the refractive indices of the epoxy resin layer and the imitation material layer is ≤ 0.02; S42, Laminate the imitation material layer and the substrate through a vacuum laminator, and the lamination parameters are: the vacuum degree ≤ 10 Pa, the temperature is 40 - 60 °C, the pressure is 0.1 - 0.5 MPa, and the pressure holding time is 30 - 60 seconds; Step 5), Post-treatment and function enhancement: S51, Use a laser cutting device to trim the edge of the laminated display screen to align the imitation material layer with the substrate edge; S52, Use a plasma cleaner to clean the surface of the display screen to remove residual pollutants; S53, Spray a layer of nano-hydrophobic coating on the surface of the imitation material layer, the coating thickness is 50 - 200 nm, and the contact angle ≥ 110°.

2. The preparation method of an imitation material display screen according to claim 1, characterized in that: The microlens array in the said step 2) is arranged in a hexagonal pattern, and the center distance between adjacent microlenses is 1.2 - 1.5 times the diameter of the lens, which is used to eliminate the granularity between LED pixels and improve the light scattering uniformity.

3. The preparation method of an imitation material display screen according to claim 1, characterized in that: The photosensitive resin in the 3D printing method in step 3) comprises the following components by mass percentage: 60-80% of epoxy acrylate, 2-5% of photoinitiator, 10-20% of nano-silica dispersion liquid with a particle size of 50-100 nm, 0.1-0.5% of defoaming agent, and the haze of the resin after curing is ≤5%.

4. The preparation method of an imitation material display screen according to claim 1, characterized in that: The surface scattering microstructure of the acrylic plate in the laminated acrylic method in step 3) is a V-shaped groove, the groove depth is 5-15 μm, and the spacing is 20-50 μm, which is used to reduce the glare of the LED point light source.

5. The preparation method of an imitation material display screen according to claim 1, characterized in that: The light transmittance gradient region in the printing method in step 3) is achieved by the following method: adding titanium dioxide or silica nanoparticle light transmittance regulators to the UV inkjet ink, controlling the solid content of the ink in the local area to be 10-30%, so that the light transmittance gradually changes from 60% to 90%.

6. The preparation method of an imitation material display screen according to claim 1, characterized in that: The optical adhesive in step 4) comprises the following components: 50-70% of acrylate prepolymer, 5-10% of nano-alumina particles with a particle size of 20-50 nm, 1-3% of silane coupling agent, 3-5% of photoinitiator, and the elastic modulus is 0.1-1 MPa.

7. The preparation method of an imitation material display screen according to claim 1, characterized in that: The nano-hydrophobic coating in step 5) is composed of the following components: 80-90% of fluorosilicon-modified acrylic resin, 5-10% of nano-silica sol, 3-5% of photocuring agent, and the surface hardness of the coating is ≥3H.

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