High-definition optical composite coating film and preparation method thereof
By introducing nano-conductive polymers and PMMA-PS microspheres into optical composite films, combined with high-refractive-index resins and microlens arrays, the problems of optical enhancement and viewing angle compatibility were solved, and high-efficiency light management and high-definition optical composite coating films were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU SHUANGXING COLOR PLASTIC NEW MATERIALS
- Filing Date
- 2026-01-26
- Publication Date
- 2026-06-02
AI Technical Summary
Existing optical composite films cannot achieve both optical enhancement and viewing angle. Traditional multilayer structures lead to increased thickness, complex assembly, and susceptibility to foreign object contamination. Furthermore, the closer the apex angle of the prism layer is to 90°, the better the effect but the worse the viewing angle.
By employing nano-conductive polymers, PMMA-PS microspheres, and high-refractive-index photocurable resin, and through the design of microlens arrays and prism layer structures, combined with a stepwise UV curing process, a high-definition optical composite coating film is formed, achieving a precise optical structure for the diffusion layer and prism layer.
It achieves a balance between light uniformity, brightness enhancement, and high definition, improving light utilization efficiency within the viewing angle, ensuring product clarity and reliability, and reducing thickness and assembly complexity.
Smart Images
Figure CN122131434A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of optical film technology, specifically high-definition optical composite coating film and its preparation method. Background Technology
[0002] In the field of LCD backlight modules, the core function of optical composite films is to efficiently and orderly manage the light from the backlight source through precise multi-layer microstructure design, so as to simultaneously achieve the two major goals of light uniformity and brightness enhancement.
[0003] With the continued pursuit of ultra-thin, narrow-bezel designs in applications such as smartphones, laptops, and automotive displays, and the popularization of new technologies like Mini LED, the industry is demanding more advanced and efficient light management solutions to fully realize their potential for high dynamic range and high image quality. Generally, the performance of composite films is not a simple superposition of the functions of each layer, but rather requires the synergy and balance of multiple optical effects to achieve overall optimization. Traditional backlight modules require stacking multiple independent films such as diffuser films and prism films sequentially, leading to increased overall thickness, cumbersome assembly processes, and an increased risk of decreased yield due to foreign object contamination. Currently, in addition to technological challenges, optical composite films also face a structural contradiction: in the prism layer, the closer the top angle of the prism structure is to 90°, the better the optical enhancement effect, but the worse the viewing angle.
[0004] To address the challenge of achieving both enhanced optical performance and optimal viewing angle in existing optical composite films, a high-definition optical composite coating film and its fabrication method are proposed. Summary of the Invention
[0005] The purpose of this invention is to provide a high-definition optical composite coating film and its preparation method. This invention involves mixing a nano-conductive polymer, a silicone additive, and a diffusion liquid to obtain a diffusion layer coating liquid; dispersing PMMA-PS microspheres in the diffusion layer coating liquid to obtain a composite coating liquid; mixing a prism layer resin and nano-silica to obtain a prism layer coating liquid; coating the back of a PET substrate with the composite coating liquid and passing it through a microlens array to obtain a diffusion layer; coating the front of the substrate with the prism layer coating liquid to obtain a prism layer; and finally, after curing, attaching a PE protective film to one side of the prism layer to obtain the composite coating film product.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] A high-definition optical composite coating film and its preparation method, comprising the following steps:
[0008] Unless otherwise specified, the parts in this invention refer to parts by mass.
[0009] Mix 1.5 parts of nano-conductive polymer, 0.5 parts of silicone additive, and 100 parts of diffusion liquid to obtain the diffusion layer coating liquid.
[0010] The diffusion fluid includes polyurethane acrylate and methyl ethyl ketone, wherein the mass percentage of polyurethane acrylate is 85%, and the viscosity of the diffusion fluid is 800-1200 mPa·s (25℃).
[0011] The nano-conductive polymer is an aqueous dispersion of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid), and the mass fraction indicates the mass of the dispersion; the silicone additive is ST-polydimethylsiloxane alcohol 40 (produced by DuPont).
[0012] 15 parts of PMMA-PS microspheres were dispersed in 100 parts of diffusion layer coating solution, and after ultrasonic treatment, 4 parts of photoinitiator were added and cured for 2 hours to obtain composite coating solution.
[0013] The core component of the PMMA-PS microspheres is polystyrene with a refractive index ≥1.59; the shell component is PMMA with an average refractive index of 1.49, and the average particle size of the microspheres is 4 μm. The photoinitiators include hydroxycyclohexylphenyl ketone and trimethylbenzoyl diphenylphosphine oxide, which are used in combination at a mass ratio of 3:1. All photoinitiators used in this invention are the same.
[0014] After mixing and dispersing 100 parts of prism layer resin and 2 parts of nano silica, 3 parts of photoinitiator were added and the mixture was cured for 2 hours to obtain the prism layer coating solution.
[0015] The average particle size of the nano-silica is 20-30 nm. The prism layer resin includes: 9,9-bis[4-(2-methacryloyloxyethylthio)phenyl]fluorene (CAS 161182-73-6); bis(4-(methacryloyloxythio)phenyl) sulfide (CAS 129283-82-5); and ethyl acetate. The mass ratio of 9,9-bis[4-(2-methacryloyloxyethylthio)phenyl]fluorene to bis(4-(methacryloyloxythio)phenyl) sulfide is 3:2. The mass fraction of ethyl acetate is 10-15%. The viscosity of the prism layer resin is 1000-1500 mPa·s (25℃).
[0016] After unrolling the PET substrate, it is subjected to corona treatment. A composite coating liquid is then coated on the back of the PET substrate. The micro-grooving roller has a screen count of 120 LPI, and the wet film thickness is controlled at 8-10 μm. The substrate is then pre-formed and pre-cured using a microlens array to obtain a diffusion layer.
[0017] The PET substrate has an average thickness of 100μm, a light transmittance of ≥92%, and a haze of ≤0.5%.
[0018] The process parameters for corona treatment are: power density of 20-25 W·min / m³. 2 The electrode gap is 1.5mm, and the dyne value of the treated PET substrate is not less than 52mN / m; the pre-curing process parameters are: curing wavelength of 365nm, UV energy of 180-240mJ / cm². 2 UV light intensity is 400mW / cm 2 .
[0019] In the microlens array, each lens is elliptical with a major axis of 30 μm and a minor axis of 20 μm.
[0020] The PET substrate is flipped over, and a prism layer coating liquid is applied to its front side. The number of lines on the micro-grooving roller is 100 LPI, and the wet film thickness is controlled at 15-20 μm. Then, the prism is formed by the forming roller, and the prism layer is obtained after a second pre-curing.
[0021] The process parameters for the second pre-curing are as follows: curing wavelength of 365nm and UV energy of 220-260mJ / cm². 2 UV light intensity is 500mW / cm 2 On the prism mold on the surface of the forming roller, the prism apex angle is 90°, the prism spacing varies randomly within the range of 50μm±2μm, and the prism valley bottom is randomly etched with pits with a depth of <1μm.
[0022] The PET substrate with diffusion layer and prism layer is finally cured, and then a 50μm thick PE protective film is laminated online on one side of the prism layer. After winding, the composite coated film product is obtained.
[0023] The final curing process parameters are as follows: Curing is performed in two stages under nitrogen protection. The first stage of curing uses the UVA band with a light intensity of 320 mW / cm². 2 The second stage of curing covers the entire UVA, UVB, and UVC bands, with a light intensity of 500 mW / cm². 2 The UV energy ratio for each band is UVA:UVB:UVC = 500:250:50, and the total UV energy for the two curing stages is 900-1200 mJ / cm². 2 .
[0024] The high-definition optical composite coating film comprises, in sequence: a diffusion layer, a PET substrate, a prism layer, and a PE protective film. The diffusion layer has an average refractive index of 1.49, and the prism layer has an average refractive index of 1.58.
[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0026] 1. Core-shell structured PMMA-PS microspheres are introduced into the diffusion layer coating solution to form the diffusion layer. The refractive index of the microsphere shell is almost equal to that of the acrylic resin in the diffusion layer matrix, significantly reducing interfacial light scattering; the refractive index of the microsphere core is higher, undertaking the function of light deflection and diffusion. This specially designed refractive index matching with the matrix in the core-shell structure ensures both effective diffusion and maximizes image sharpness, while also providing a good structural basis for the needs of shielding light shadows and expanding the viewing angle.
[0027] 2. Using micro-concave roller coating technology, a diffusion layer coating liquid containing PMMA-PS microspheres is uniformly coated onto the back side of a PET substrate. Subsequently, an asymmetric curvature microlens array is used to pre-form the diffusion layer, followed by pre-curing, resulting in a diffusion layer on the back side of the PET substrate. The core-shell structure of the PMMA-PS microspheres provides light diffusion and homogenization within the diffusion layer, while the diffusion layer substrate forming the asymmetric microlens structure provides interfacial refraction and light redistribution on the coating surface, achieving precise control over the emitted light angle. The specific asymmetric lens array and the core-shell structure microspheres with a specific refractive index work together to ensure that light is sufficiently softened and emitted along the designed path, improving light utilization efficiency within the effective viewing angle and guaranteeing the clarity of the composite film product.
[0028] 3. A prism layer with random prism spacing is obtained by coating a high-refractive-index photocurable resin onto the front side of a PET substrate and forming it using a forming roller. Further, random pits are etched at the valleys of the prism stripes. The high-refractive-index photocurable resin is fundamental to achieving total internal reflection and enhancing brightness, while the variable prism spacing structure and the etched pits at the valleys function synergistically. The former solves the compatibility problem between brightness enhancement and high definition, while the latter improves contrast while enhancing brightness. Both work together to achieve the final high-definition visual experience.
[0029] 4. Through a step-by-step UV curing process, pre-curing is performed separately during the formation of the diffusion layer and the prism layer, and final curing is performed after the composite film structure is formed. The specific formulations of different structural layers and the interlayer structure ensure that the precise optical structure in the diffusion layer and the prism layer can be well preserved and cured. By dispersing different functional fillers in different structural layers, the excellent clarity and viewing angle of the composite film product are guaranteed, while the mechanical properties of the product are also ensured. This prevents the product from failing due to delamination or detachment during subsequent processes such as cutting and assembly, thus improving the overall reliability of the product. Attached Figure Description
[0030] Figure 1 This is a flowchart illustrating the fabrication process of the high-definition optical composite coating film in this invention. Detailed Implementation
[0031] The technical solution of the present invention will be clearly and completely described below through some embodiments and experimental examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0032] Reference Figure 1 The process flow diagram shown illustrates that this invention provides a high-definition optical composite coating film and its preparation method. The technical solution is as follows:
[0033] Example 1
[0034] Mix 1.5 parts of nano-conductive polymer, 0.5 parts of silicone additive, and 100 parts of diffusion liquid to obtain the diffusion layer coating liquid.
[0035] 15 parts of PMMA-PS microspheres were dispersed in 100 parts of diffusion layer coating solution, and after ultrasonic treatment, 4 parts of photoinitiator were added and cured for 2 hours to obtain composite coating solution.
[0036] After mixing and dispersing 100 parts of prism layer resin and 2 parts of nano silica, 3 parts of photoinitiator were added and the mixture was cured for 2 hours to obtain the prism layer coating solution.
[0037] After unwinding the PET substrate, it undergoes corona treatment. A composite coating liquid is then applied to the back of the PET substrate using a micro-grooving roller with a screen count of 120 LPI. The wet film thickness is controlled within 8-10 μm. The substrate is then pre-formed and pre-cured using a microlens array to obtain a diffusion layer. The wet film thickness, as a range parameter, is not entirely uniform across the PET substrate, but consistently remains within the range of 8-10 μm.
[0038] The process parameters for corona treatment are: power density of 20 W·min / m³. 2 The electrode gap is 1.5 mm, and the dyne value of the treated PET substrate is not less than 52 mN / m; the pre-curing process parameters are: curing wavelength of 365 nm and UV energy of 180 mJ / cm². 2 UV light intensity is 400mW / cm 2 In the microlens array, each lens is elliptical with a major axis of 30 μm and a minor axis of 20 μm.
[0039] The PET substrate is flipped over, and a prism layer coating liquid is applied to its front side. The number of lines on the micro-grooving roller is 100 LPI, and the wet film thickness is controlled at 15-20 μm. Then, the prism is formed by the forming roller, and the prism layer is obtained after a second pre-curing.
[0040] The process parameters for the second pre-curing are: curing wavelength of 365nm and UV energy of 220mJ / cm.2 UV light intensity is 500mW / cm 2 On the prism mold on the surface of the forming roller, the prism apex angle is 90°, the prism spacing varies randomly within the range of 50μm±2μm, and the prism valley bottom is randomly etched with pits with a depth of <1μm.
[0041] The PET substrate with diffusion layer and prism layer is finally cured, and then a 50μm thick PE protective film is laminated online on one side of the prism layer. After winding, the composite coated film product is obtained.
[0042] The specific parameters for final curing are as follows: Under nitrogen protection, two-stage curing is performed. The wavelength of the first stage of curing is in the UVA band, with a light intensity of 320 mW / cm². 2 The second stage of curing covers the entire UVA, UVB, and UVC bands, with a light intensity of 500 mW / cm². 2 The UV energy ratio for each band is UVA:UVB:UVC = 500:250:50, and the total UV energy for the two curing stages is 900 mJ / cm². 2 .
[0043] Crucially, the average refractive index of the diffusion layer is 1.49, the average refractive index of the prism layer is 1.58, and the average refractive index of the shell of the PMMA-PS microsphere is 1.49, which is basically equal to the average refractive index of the diffusion layer; the core refractive index of the PMMA-PS microsphere is ≥1.59, which is higher than that of the prism layer and the diffusion layer.
[0044] Examples 2-16 differ from Example 1 in operating parameters, but the other process steps and the range of raw material selection are the same.
[0045] The specific changes in operating parameters are summarized in Table 1.
[0046]
[0047] Comparative Example 1
[0048] Unlike Example 1, PMMA microspheres with an average particle size of 4 μm were used instead of PMMA-PS microspheres, while all other process parameters remained the same.
[0049] Comparative Example 2
[0050] Unlike Example 1, the diffusion liquid was replaced with an equal mass of Nitto NT-32UV resin, and the average refractive index of the diffusion layer formed after curing was 1.52. All other process parameters were the same.
[0051] Comparative Example 3
[0052] Unlike Example 5, a microlens array is not used in the diffusion layer forming process, but all other process parameters are the same.
[0053] Comparative Example 4
[0054] Unlike Example 5, in the diffusion layer forming process, the microlens array uses an array structure in which each lens is hemispherical with a radius of 25 μm, while other process parameters are the same.
[0055] Comparative Example 5
[0056] Unlike Example 5, PMMA-PS microspheres were not added, but all other process parameters remained the same.
[0057] Comparative Example 6
[0058] Unlike Example 9, the prism spacing was kept at 50 μm during the prism layer forming process and was not randomly varied, while other process parameters remained the same.
[0059] Comparative Example 7
[0060] Unlike Example 9, no pits are etched at the bottom of the prism valley, but all other process parameters are the same.
[0061] Comparative Example 8
[0062] Unlike Example 9, a diffusion liquid was used instead of the prism layer resin in the subsequent processes, and the final prism layer had an average refractive index of 1.49, while other process parameters remained the same.
[0063] Comparative Example 9
[0064] Unlike Example 13, in the final curing process, the first stage of curing uses all bands of UVA, UVB and UVC, while other process parameters are the same.
[0065] Comparative Example 10
[0066] Unlike Example 13, the first curing conditions for final curing were used for pre-curing and the second pre-curing, while all other process parameters were the same.
[0067] Experimental Example 1
[0068] The haze and transmittance of the composite coated film products prepared in Examples 1-4 and Comparative Examples 1-2 were tested, and the relevant results are summarized in Table 2.
[0069] The testing methods for haze and transmittance are as follows: Referring to the ASTM D1003 standard, the light scattering degree of the prepared composite coating film sample is measured and recorded as haze (%); the transmittance (%) of the sample is tested and recorded. The higher the transmittance and the lower the haze of the sample, the better its overall performance.
[0070]
[0071] As shown in Table 2, the composite coated films prepared in Examples 1-4 exhibit excellent overall performance in terms of haze and light transmittance.
[0072] Comparative Example 1 uses ordinary PMMA microspheres instead of core-shell PMMA-PS microspheres. Since the refractive index of the microspheres and the diffusion layer substrate is almost the same, the haze level of the diffusion layer is too low, and it cannot achieve effective shielding and light homogenization. Comparative Example 2 replaces the refractive index of the diffusion layer substrate with 1.52, which destroys the refractive index matching between the microsphere shell and the substrate. This results in significantly enhanced interfacial light scattering, a large increase in haze and a severe decrease in transmittance, which also proves the rationality of the refractive index matching design in the complete technical solution of this invention.
[0073] In summary, this invention introduces core-shell structured PMMA-PS microspheres into the diffusion layer. The high-refractive-index polystyrene core undertakes the primary light diffusion function, while the refractive index of the PMMA shell and the cured polyurethane acrylate matrix are both 1.49, resulting in a significant synergistic effect. The precise refractive index matching between the shell and the matrix minimizes disordered interfacial light scattering, while the high-refractive-index core provides controllable volume scattering. This specific material system synergistically optimizes the optical performance of the composite film, achieving a balance between high transmittance and high clarity while ensuring effective diffusion, significantly improving the overall performance of the product.
[0074] Experiment Example 2
[0075] The brightness gain and viewing angle of the composite coated film products prepared in Examples 5-8 and Comparative Examples 3-5 were tested, and the relevant results are summarized in Table 3.
[0076] The method for testing luminance gain is as follows: the sample is attached to a standard backlight module, and the ratio of the luminance value at the center vertical viewing angle to the luminance value when the sample is not attached is measured and recorded as luminance gain.
[0077] The test method for viewing angle is as follows: the sample is attached to a standard backlight module, and the angle range when the brightness drops to 50% of the center brightness in the horizontal and vertical directions is measured respectively, and recorded as the horizontal viewing angle (°) and the vertical viewing angle (°).
[0078]
[0079] As shown in Table 3, Examples 5-8 exhibited excellent performance in terms of luminance gain and horizontal and vertical viewing angles.
[0080] Comparative Example 3, which does not use a microlens array, results in a significant decrease in luminance gain, and the horizontal and vertical viewing angles narrow and tend to be consistent. Comparative Example 5, which does not add PMMA-PS microspheres, although the luminance gain is improved, its horizontal and vertical viewing angles are significantly narrowed, losing the advantage of a wide viewing angle. Comparative Example 4, which uses a hemispherical microlens array instead of an asymmetric elliptical array, results in a significant reduction in the horizontal viewing angle, losing the ability to control the asymmetric light field, which also proves the rationality of using an asymmetric elliptical lens array as a template in this invention.
[0081] In summary, this invention simultaneously incorporates PMMA-PS microspheres and an asymmetric microlens array within the diffusion layer. These two elements produce a significant synergistic effect: the core-shell structure of the PMMA-PS microspheres provides light diffusion and homogenization within the diffusion layer, while the asymmetric microlens structure provides interface refraction and light redistribution on the coating surface. The specific asymmetric lens array, working in conjunction with the core-shell microspheres, ensures that light is sufficiently softened and emitted along a designed path, improving light utilization efficiency within the effective viewing angle and achieving a balance between high brightness gain and a wide horizontal viewing angle.
[0082] Experimental Example 3
[0083] The moiré pattern intensity and contrast of the composite coated films prepared in Examples 9-12 and Comparative Examples 6-8 were tested. The relevant results are summarized in Table 4.
[0084] The moiré pattern evaluation method is as follows: Place the sample on a standard backlight module, and use a high-resolution two-dimensional luminance meter to capture the screen image at 50% grayscale. Perform two-dimensional Fast Fourier Transform (FFT) analysis on the captured luminance image. Record the peak intensity (dB) in the low-frequency region of the FFT spectrum. The lower the peak intensity, the less obvious the moiré pattern. To eliminate the influence of the background light source, a normalized comparison method is used to determine the intensity of the moiré pattern. That is, divide the peak frequency (dB) of the moiré pattern by the amplitude (dB) of the DC component to obtain a normalized amplitude (%). The smaller the normalized amplitude, the lower the intensity of the moiré pattern.
[0085] The contrast ratio test method is as follows: attach the sample to the standard backlight module, measure the brightness (Lw) of the center point of the full white screen and the brightness (Lb) of the center point of the full black screen respectively, and calculate the contrast ratio = Lw / Lb.
[0086]
[0087] As shown in Table 4, the composite coating films prepared in Examples 9-12 exhibit excellent performance in terms of moiré pattern strength and contrast.
[0088] Comparative Example 6 uses a fixed prism spacing, which leads to a significant increase in moiré pattern intensity, indicating that randomly varying prism spacing is a key design feature for suppressing moiré patterns. Comparative Example 8 uses a low-refractive-index resin instead of a high-refractive-index prism layer resin, resulting in a significant decrease in contrast, which also proves the rationality of using high-refractive-index resin as the basis for achieving excellent optical performance. Comparative Example 7 does not etch pits at the bottom of the prism valleys, resulting in a significant decrease in contrast, indicating that the microstructure at the bottom of the valleys plays an important role in improving contrast.
[0089] In summary, this invention utilizes a high-refractive-index photocurable resin as the basis for achieving total internal reflection and enhancing brightness. Simultaneously, it combines randomly varying prism spacing with a valley-etched pit structure, resulting in a significant synergistic effect. The variable prism spacing structure resolves the compatibility issue between brightness enhancement and high definition, while the valley-etched pits improve contrast while simultaneously enhancing brightness. Both work together to deliver a superior high-definition visual experience.
[0090] Experiment Example 4
[0091] The surface hardness and adhesion of the composite coating film products prepared in Examples 13-16 and Comparative Examples 9-10 were tested, and the relevant results are summarized in Table 5.
[0092] The surface hardness test method refers to ASTM D3363 standard. The test is performed on the prism layer surface of the sample using a pencil hardness tester. The surface hardness of each sample is recorded and determined by the hardest pencil that can scratch the coating.
[0093] The adhesion test method is as follows: refer to ASTM D3359 standard, perform 100-grid tests on the surface of the prism layer and diffusion layer of the sample respectively, and record the corresponding adhesion level (0B-5B, 5B represents no peeling, 0B represents complete peeling).
[0094]
[0095] As shown in Table 5, the composite coating films prepared in Examples 13-16 exhibit excellent performance in terms of surface hardness and adhesion.
[0096] Comparative Example 9 used full-band ultraviolet light in the first stage of final curing, and the adhesion of its prism layer and diffusion layer decreased significantly, indicating that step-by-step curing from the inside out is crucial for managing curing shrinkage stress and ensuring interlayer bonding. Comparative Example 10 used high-energy curing conditions for pre-curing, and its adhesion also decreased, which also proves the rationality of low-energy pre-curing for initial structural shaping and stress control.
[0097] In summary, this invention employs a step-by-step UV curing process. Low-energy pre-curing first effectively shapes the precision optical structures in the diffusion and prism layers, while the subsequent two-stage final curing process ensures complete polymerization of the coating from the interface to the surface. This specific curing procedure synergistically optimizes the stress distribution during curing, ensuring excellent optical performance of the composite film while also guaranteeing its mechanical properties and overall reliability, making it less prone to delamination failure in subsequent processes.
[0098] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A method for preparing a high-definition optical composite coating film, characterized in that: The preparation method is as follows: A diffusion layer coating solution is obtained by mixing nano-conductive polymer, silicone additive and diffusion liquid; PMMA-PS microspheres were dispersed in the diffusion layer coating solution, and a photoinitiator was added to obtain a composite coating solution; The prism layer resin and nano-silica are mixed and dispersed, and then the photoinitiator is added to obtain the prism layer coating liquid; After corona treatment of the PET substrate, the composite coating liquid is coated on the back side and pre-formed by a microlens array. After pre-curing, a diffusion layer is obtained. The prism layer coating liquid is coated on the front side of the PET substrate, and the prism is pre-cured a second time after prism forming to obtain the prism layer. The PET substrate with the diffusion layer and the prism layer is finally cured, and a PE protective film is then laminated onto one side of the prism layer to obtain the composite coated film product.
2. The method for preparing the high-definition optical composite coating film according to claim 1, characterized in that: The core component of the PMMA-PS microspheres is polystyrene, and the shell component is PMMA; the nano-conductive polymer is an aqueous dispersion of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid).
3. The method for preparing the high-definition optical composite coating film according to claim 1, characterized in that: In the microlens array, each lens is elliptical; The diffusion liquid comprises: polyurethane acrylate and methyl ethyl ketone.
4. The method for preparing a high-definition optical composite coating film according to claim 1, characterized in that: The prism layer resin comprises: 9,9-bis[4-(2-methacryloyloxyethylthio)phenyl]fluorene, bis(4-(methacryloyloxythio)phenyl) sulfide, and ethyl acetate.
5. The method for preparing a high-definition optical composite coating film according to claim 1, characterized in that: The prism forming process employs a forming roller with a prism mold. The prism spacing in the prism mold varies randomly, and pits are etched at the bottom of the prism valleys.
6. The method for preparing a high-definition optical composite coating film according to claim 1, characterized in that: The final curing process is divided into two stages. The first stage of curing uses the UVA band, and the second stage of curing uses all the UVA, UVB and UVC bands.
7. The method for preparing a high-definition optical composite coating film according to claim 1, characterized in that: The photoinitiator includes hydroxycyclohexylphenyl ketone and trimethylbenzoyl diphenylphosphine oxide.
8. A high-definition optical composite coating film, comprising, in sequence: The high-definition optical composite coating film is prepared by the preparation method described in any one of claims 1-7.