Diffusion membrane, method for producing the same, and use thereof

Abstract

This application relates to the field of optical thin film technology, and more particularly to a diffusion film, its preparation method, and its application. A diffusion film is provided, comprising a substrate and a diffusion film disposed on any surface of the substrate. The diffusion film is prepared from components with the following mass percentages: 0.5%–10% diffusion particles and 90–99.5% solvent. The resulting diffusion film exhibits high haze, high clarity, and high light transmittance. The provided formula is simple, reduces the use of other components, is low in cost, facilitates the dispersion of diffusion particles, achieves ideal light diffusion effects, and is suitable for widespread use.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of optical film, and particularly relates to a diffusion film and a preparation method and application thereof. BACKGROUND

[0002] The diffusion film is a functional film, which relies on small particles with different refractive indexes dispersed in the diffusion film or on the surface of the diffusion film to refract or scatter, so that a point light source becomes a surface light source, or light is more uniform in the whole surface. Meanwhile, the diffusion film is also an important component of a backlight module. When the backlight is turned on, light is transmitted through a light guide plate and vertically passes through an LCD display into the visual field of an observer. Since the backlight is a point light source or a line light source, in order to make the light of the whole display panel uniform, one or two layers of diffusion films need to be added to the backlight module.

[0003] At present, most of the diffusion films on the market are prepared by adding a solvent, a diluent, an additive, a curing agent and diffusion particles into resin, stirring and dispersing to obtain a coating liquid, and then coating the coating liquid on both surfaces of PET, and drying in an oven to obtain the diffusion film. The formula and process are relatively complex, the required coating equipment is high, and the cost is high. Since the light diffusion particles are prone to agglomeration, effective dispersion of the particles is difficult, and ideal light diffusion effect is often not obtained.

[0004] Moreover, in the use process of the backlight module, the surface of the diffusion film is scratched or abraded by the edges of the prism module, which finally leads to uneven brightness of the backlight part, poor light uniformity, and affects the display effect, which is not conducive to wide use. SUMMARY

[0005] The application aims to provide a diffusion film and a preparation method and application thereof, and aims to solve the problems in the prior art that the formula and preparation process of the diffusion film are complex, which is not conducive to achieving ideal light diffusion effect and affects use.

[0006] To achieve the above application purposes, the technical scheme adopted by the application is as follows:

[0007] In a first aspect, the application provides a diffusion film, which comprises a substrate and a diffusion film arranged on any surface of the substrate, wherein the diffusion film is prepared from the following components with mass percentage: 0.5% to 10% of diffusion particles and 90% to 99.5% of a solvent.

[0008] In a second aspect, the application provides a preparation method of the diffusion film, which comprises the following steps:

[0009] The diffusion particles and the solvent are mixed according to the mass percentage of each component of the diffusion film to obtain a diffusion film mixed coating liquid;

[0010] A substrate is provided, the diffusion film mixed coating liquid is coated on any surface of the substrate, and the substrate is left to flow flat.

[0011] The curing treatment is performed by using a curing device to obtain the diffusion film.

[0012] In a third aspect, the application provides the diffusion film or the diffusion film prepared by the preparation method of the diffusion film in a display module.

[0013] The diffusion film provided in the first aspect of the application comprises a substrate and a diffusion film arranged on any surface of the substrate, and the diffusion film is composed of diffusion particles and a solvent. The formula does not include a resin system, so that the diffusion particles can be embedded in the interior of the substrate or inlaid on the surface of the substrate. In the absence of resin mixing, the difference between the refractive indexes of the substrate and the diffusion particles is small, which can effectively reduce back scattering and improve the transmittance of the diffusion film. The addition ratio of the diffusion particles and the solvent is controlled to adjust the haze of the diffusion film to be between 15% and 99%, so that the clarity of the diffusion film is also high and does not obviously affect the display. The obtained diffusion film has the characteristics of high haze, high clarity and high transmittance. The formula is simple, the use of other components is reduced, the cost is low, the dispersion of the diffusion particles is facilitated, the ideal light diffusion effect can be achieved, and the diffusion film is suitable for wide use.

[0014] The preparation method of the diffusion film provided in the second aspect of the application comprises the following steps: mixing the diffusion particles and the solvent to obtain a diffusion film mixed coating liquid, and coating and curing the diffusion film mixed coating liquid to obtain the diffusion film. Since the diffusion film mixed coating liquid reduces the use of resin, the cost is low, the diffusion particles are easy to disperse, the stirring bubbles are few, the flowability is good, the coating is easy, the coating defects are reduced, and the film forming speed is fast. The preparation method simplifies the production process and is suitable for large-scale preparation and use.

[0015] The application of the diffusion film or the diffusion film prepared by the preparation method of the diffusion film in a display module provided in the third aspect of the application has high haze, high transmittance, high clarity and the like, can be directly compounded under the polarizing sheet, has high haze, high shielding property, high clarity and the like, can correct the diffusion angle and improve the light uniformity to meet the needs of users. When the diffusion film in the backlight module is abnormal and uneven bright and dark occurs, the TAC-based diffusion film can correct the diffusion angle and make the light into a uniform area light source, has good shielding function and improves the light uniformity. The diffusion film does not include resin, does not increase the thickness of the diffusion film, and does not affect the dispersion effect of the diffusion particles, so that the obtained backlight module has excellent performance. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0017] Figure 1 FIG. 1 is a schematic diagram of a diffusion film provided by an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0019] In the present application, the term "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0020] In the present application, "at least one" means one or more, and "multiple" means two or more. "At least one" or similar expressions refer to any combination of these items, including any combination of single item or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can mean a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, wherein a, b, and c can be single or multiple.

[0021] It should be understood that in various embodiments of the present application, the size of the sequence number of the above processes does not mean the order of execution, and part or all of the steps can be executed in parallel or in sequence. The execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0022] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0023] The weight of the related components mentioned in the embodiment specification of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of each component. Therefore, as long as the content of the related components in the embodiment specification of the present application is proportionally enlarged or reduced, it is within the scope disclosed in the embodiment specification of the present application. Specifically, the mass in the embodiment specification of the present application can be μg, mg, g, kg, etc. mass units commonly known in the chemical industry.

[0024] The terms "first", "second" are only for descriptive purposes, to distinguish objects such as substances from each other, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. For example, without departing from the scope of the present application, the first XX can also be referred to as the second XX, and similarly, the second XX can also be referred to as the first XX. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0025] The first aspect of the present application provides a diffusion film, such as Figure 1 As shown, the diffusion film includes a substrate 2 and a diffusion film disposed on any surface of the substrate 2, wherein the diffusion film is prepared from the following components with mass percentage: 0.5% to 10% of diffusion particles and 90% to 99.5% of solvent.

[0026] The diffusion film provided by the first aspect of the present application includes a substrate and a diffusion film disposed on any surface of the substrate, and the diffusion film provided is composed of diffusion particles and solvent. The formula does not include a resin system, so that the diffusion particles can be embedded in the interior of the substrate or inlaid on the surface of the substrate. In the absence of resin mixing, the difference between the refractive indexes of the substrate and the diffusion particles is small, which can effectively reduce back scattering and improve the transmittance of the diffusion film. The addition ratio of the diffusion particles and the solvent is controlled to adjust the haze of the diffusion film to be between 15% and 99%, ensuring that the clarity of the diffusion film is also high and will not have a significant impact on display. The resulting diffusion film has the characteristics of high haze, high clarity and high light transmittance. The provided formula is simple, reduces the use of other components, has low cost, is conducive to the dispersion of diffusion particles, can achieve ideal light diffusion effect, and is conducive to wide use.

[0027] In some embodiments, the diffusion film is prepared from the following components with mass percentage: 0.5% to 10% of diffusion particles and 90% to 99.5% of solvent. The addition ratio of the diffusion particles and the solvent is controlled to adjust the haze of the diffusion film to be between 15% and 99%, ensuring that the clarity of the diffusion film is also high and will not have a significant impact on display.

[0028] In some embodiments, the diffusion film comprises 0.5% to 10% by mass of diffusing particles. In some specific embodiments, the diffusion film comprises diffusing particles in the following mass percentages: 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, and 10%.

[0029] In some embodiments, the diffusion particles include at least one of PMMA particles, PBMA particles, Pst particles, PU particles, nano-barium sulfate, calcium carbonate, silicon dioxide, and titanium dioxide. Different diffusion particles are selected for use based on the properties of different diffusion films.

[0030] In some embodiments, the particle size of the diffused particles is 1–10 μm. By controlling the particle size of the diffused particles, on the one hand, the particles are ensured to have strong fluidity and easy dispersion, which is beneficial for controlling the transmittance of the diffused film; on the other hand, the haze of the diffused film is adjusted between 15% and 99%, ensuring that the clarity of the diffused film is also high and will not have a significant impact on the display, so that the resulting diffused film has the characteristics of high haze, high clarity, and high transmittance.

[0031] In some specific embodiments, the particle size of the diffused particles is selected from: 1μm, 1.5μm, 2μm, 2.5μm, 3μm, 3.5μm, 4μm, 4.5μm, 5μm, 5.5μm, 6μm, 6.5μm, 7μm, 7.5μm, 8μm, 8.5μm, 9μm, 9.5μm, and 10μm.

[0032] In some specific embodiments, the diffusion film comprises a solvent with a mass percentage of 90% to 99.5%. In some specific embodiments, the diffusion film comprises the following solvent mass percentages: 90%, 90.5%, 91%, 91.5%, 92%, 92.5%, 93%, 93.5%, 94%, 94.5%, 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, and 99.5%.

[0033] In some embodiments, the solvent is selected from cyclohexanone or a mixture of cyclohexanone and other co-solvents.

[0034] In some embodiments, the co-solvent includes at least one of ethyl acetate, butyl acetate, methanol, isopropanol, propylene glycol methyl ether acetate, butanone, acetone, methyl isobutyl ketone, and propylene glycol methyl ether.

[0035] In some embodiments, when the solvent is selected from a mixture of cyclohexanone and other co-solvents, the volume ratio of cyclohexanone to other co-solvents is 50% to 100%: 0% to 50%.

[0036] Furthermore, the diffusion film includes a substrate and a diffusion film disposed on any surface of the substrate. In some embodiments, the substrate is selected from TAC substrates. In some specific embodiments, the TAC substrate model is selected from, but not limited to, at least one of Konica KC2UAW, Konica KC4UAW, Konica KC6UAW, Lucky, Fuji TG40UL, Fuji TJ25UL, Fuji TD60UL, Fuji TD80UL, Hyosung PG401S, Hyosung PG402S, Dahui P940RR, and Dahui P960RR.

[0037] The second aspect of this application provides a method for preparing a diffusion film, comprising the following steps:

[0038] S01. The diffusion particles and solvent are mixed according to the mass percentage of each component of the diffusion film to obtain a diffusion film mixed coating solution;

[0039] S02. Provide a substrate, apply the diffusion film mixture coating liquid to any surface of the substrate, and allow it to stand and level;

[0040] S03. The diffusion film is obtained by curing using a curing device.

[0041] The second aspect of this application provides a method for preparing a diffusion film. In this method, diffusion particles and a solvent are mixed to obtain a diffusion film mixed coating liquid. The diffusion film mixed coating liquid is then coated and cured to obtain a diffusion film. Since the diffusion film mixed coating liquid reduces the use of resin, the cost is low, the diffusion particles are easily dispersed, there are few bubbles during stirring, the fluidity is good and it is easy to coat, reducing coating defects and the film formation speed is fast. This preparation method simplifies the production process and is conducive to large-scale preparation and use.

[0042] In step S01, the diffusion particles and solvent are mixed according to the mass percentage of each component of the diffusion film to obtain a diffusion film mixed coating solution.

[0043] In some embodiments, the mixing process includes mixing using any one of magnetic stirring, mechanical stirring, centrifugal stirring, or ultrasonic stirring, and the mixing time is 5 to 60 minutes.

[0044] In step S02, a substrate is provided, and the diffusion film mixture is applied to any surface of the substrate and allowed to stand and level.

[0045] In some embodiments, coating includes any one of the following methods: bar coating, doctor blade coating, spin coating, roller coating, and dip coating.

[0046] In step S03, a curing device is used to perform a curing process to obtain a diffusion film.

[0047] In some embodiments, the curing equipment is selected from an oven, and the drying process is carried out using an oven. In some embodiments, the curing temperature is 45–100°C, and the time is 1–10 minutes.

[0048] In some specific embodiments, the curing temperature is selected from 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, and 100°C; the curing time is selected from 1 minute, 1.5 minutes, 2 minutes, 2.5 minutes, 3 minutes, 3.5 minutes, 4 minutes, 4.5 minutes, 5 minutes, 5.5 minutes, 6 minutes, 6.5 minutes, 7 minutes, 7.5 minutes, 8 minutes, 8.5 minutes, 9 minutes, 9.5 minutes, and 10 minutes.

[0049] The third aspect of this application discloses the application of a diffusion film or a diffusion film prepared by a method thereof in a display module.

[0050] The diffusion film provided in the third aspect of this application, or the diffusion film prepared by the method for preparing a diffusion film, is used in a display module. Since the obtained diffusion film is a TAC-based diffusion film with high haze, high transmittance, and high definition, it can be directly laminated onto the underside of a polarizer. It features high haze, high shielding, and high definition, and can correct the diffusion angle, improve light uniformity, and meet user needs. When the diffusion film in the backlight module malfunctions and uneven brightness occurs, this TAC-based diffusion film can correct the diffusion angle and correct the light to a uniform surface light source, resulting in better shielding and improved light uniformity. Furthermore, since it does not contain resin, it does not increase the thickness of the diffusion film and does not affect the dispersion effect of the diffusion particles, resulting in a backlight module with excellent performance.

[0051] The following description is based on specific embodiments.

[0052] Example 1

[0053] Diffusion membrane and its preparation method

[0054] diffusion membrane

[0055] The diffusion film includes a substrate and a diffusion film disposed on any surface of the substrate. The diffusion film is prepared from the following components in mass percentage: 1% diffusion particles, 99% solvent, the diffusion particles are Pst particles with an average particle size of 2 μm, and the solvent is a mixed solvent of cyclohexanone, propylene glycol methyl ether and ethyl acetate in a volume ratio of 1:1:2.

[0056] The preparation method is as follows:

[0057] (1) Add 1% Pst diffusion particles to the mixed solvent, and use magnetic stirring at a speed of 1500 r / min for 30 min;

[0058] (2) Apply the coating liquid to the TAC surface using a wire bar coating method. The wire bar selected is OSP-60.

[0059] (3) After leveling for 1 minute, place it in an 80°C oven for 5 minutes to dry, and then take it out to obtain a TAC-based diffusion film.

[0060] Example 2

[0061] Diffusion membrane and its preparation method

[0062] diffusion membrane

[0063] The diffusion film includes a substrate and a diffusion film disposed on any surface of the substrate. The diffusion film is prepared from the following components in mass percentage: 2% diffusion particles, 98% solvent, the diffusion particles are Pst particles with an average particle size of 3.5 μm, and the solvent is a mixed solvent of cyclohexanone, butyl acetate and methanol in a volume ratio of 1:1:2.

[0064] The preparation method is as follows:

[0065] (1) Add 2% Pst diffusion particles to the mixed solvent, and use magnetic stirring at a speed of 1500 r / min for 30 min;

[0066] (2) Apply the coating liquid to the TAC surface using a wire bar coating method. The wire bar selected is OSP-60.

[0067] (3) After leveling for 1 minute, place it in an 80°C oven for 5 minutes to dry, and then take it out to obtain a TAC-based diffusion film.

[0068] Example 3

[0069] Diffusion membrane and its preparation method

[0070] diffusion membrane

[0071] The diffusion film includes a substrate and a diffusion film disposed on any surface of the substrate, wherein the diffusion film is prepared from the following components in mass percentage: 3% diffusion particles, 97% solvent, the diffusion particles are Pst particles with an average particle size of 5 μm, and the solvent is a cyclohexanone:methyl isobutyl ketone mixed solvent in a volume ratio of 1:1.

[0072] The preparation method is as follows:

[0073] (1) Add 3% Pst diffusion particles to the mixed solvent, and use magnetic stirring at a speed of 1500 r / min for 30 min;

[0074] (2) Apply the coating liquid to the TAC surface using a wire bar coating method. The wire bar selected is OSP-60.

[0075] (3) After leveling for 1 minute, place it in an 80°C oven for 5 minutes to dry, and then take it out to obtain a TAC-based diffusion film.

[0076] Comparative Example 1

[0077] Diffusion membrane and its preparation method

[0078] diffusion membrane

[0079] The diffusion film includes a substrate and a diffusion film disposed on any surface of the substrate. The diffusion film is prepared from the following components in mass percentage: 2% diffusion particles, 98% solvent, the diffusion particles are Pst particles with an average particle size of 5 μm, and the solvent is a solvent added to the resin, a diluent, an additive, and a curing agent.

[0080] The preparation method is as follows:

[0081] (1) Add 2% Pst diffusion particles to the mixed solvent, and use magnetic stirring at a speed of 1500 r / min for 30 min;

[0082] (2) Apply the solution to the PET surface using a doctor blade coating method. Use a 300μm doctor blade and apply 20μm of adhesive.

[0083] (3) After drying in a 100℃ oven for 5 minutes, the PET base film diffusion film is obtained.

[0084] Comparative Example 2

[0085] Diffusion membrane and its preparation method

[0086] diffusion membrane

[0087] The diffusion film includes a substrate and a diffusion film disposed on any surface of the substrate. The diffusion film is prepared from the following components in weight percentage: 6% diffusion particles, 94% solvent, the diffusion particles are Pst particles with an average particle size of 5 μm, and the solvent is a solvent added to the resin, a diluent, an additive, and a curing agent.

[0088] The preparation method is as follows:

[0089] (1) Add 6% Pst diffusion particles to the mixed solvent and stir magnetically at a speed of 1500 r / min for 30 min.

[0090] (2) The solution is coated onto the PET surface using a doctor blade coating method. A 400μm doctor blade is selected and the adhesive thickness is 25μm.

[0091] (3) After drying in a 100℃ oven for 5 minutes, the PET base film diffusion film is obtained.

[0092] Performance testing

[0093] Performance testing was conducted on the products obtained in Examples 1-3 and Comparative Examples 1-2, including:

[0094] (1) Transmission rate

[0095] The testing method is as follows: Use a V-7100 UV spectrophotometer to perform the test. Open the software, calibrate the instrument, and cut the sample to be tested into a size of approximately 4cm x 50cm using the cutting machine. The long side should be at 0° to the bottom side. Place the sample with the coated side facing the integrating sphere in the viewing window, with the long side parallel to the bottom surface. Close the test door and click "Start Test" to obtain the transmittance value.

[0096] (2) Haze

[0097] The testing method is as follows: Use the NDH-5000 haze meter to perform the test. Open the NDH-5000 software, click "calibrate", place the sample coating side facing the light-transmitting hole, and ensure that the sample covers the light-transmitting hole. Secure the sample with clamps, close the door, and click "start test" to obtain the haze value.

[0098] (3) Clarity

[0099] The testing method is as follows: Use a resolution meter to test. Open the software, set the optical mode to projection, calibrate the instrument, open the top cover, open the sample stage clamp, place the film material inside and ensure that it completely covers the light-blocking hole, fix it in place, close the cover, and click test to obtain the resolution value.

[0100] (4) Hundred-square test

[0101] The testing method is as follows: Place the sample to be tested, coated side up, on a sufficiently hard plate. Hold the handle of the cross-cutting tool, ensuring the multi-blade cutting blade is perpendicular to the membrane plane. Apply even pressure, use a steady, non-shaking motion, and cut at a speed of 20-50 mm / s. Rotate the membrane 90° and repeat the above actions on the cut to form a grid pattern. Gently brush the sample along the diagonal of the grid pattern, moving backward 5 times and forward 5 times. Achieve a completely smooth cut edge with no peeling at the grid edges.

[0102] Results Analysis

[0103] Performance tests were conducted on the products obtained in Examples 1-3 and Comparative Examples 1-2. The results are shown in Table 1. As can be seen from Table 1, the TAC-based diffusion film prepared by the special diffusion film formulation and specific production process in this application can form a light diffusion layer with excellent formability. It can be directly laminated onto the underside of a polarizer and has the characteristics of high haze, high shielding, and high clarity. It can correct the diffusion angle and improve light uniformity to meet user needs. Moreover, the higher the haze, the lower the proportion of diffusion particles used in the solution of this application compared to the traditional resin solution, without increasing the base film thickness. In traditional solutions, to achieve a high haze effect, the amount of resin must usually be increased when increasing the content of diffusion particles; otherwise, the particle dispersion effect is very poor, causing internal contamination problems.

[0104] Table 1

[0105]

[0106] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A diffusion membrane, characterized in that, The diffusion film includes a TAC substrate and a diffusion film disposed on any surface of the substrate, wherein the diffusion film is prepared from the following components in mass percentage: 0.5% to 10% diffusion particles and 90% to 99.5% solvent; the solvent is cyclohexanone or a mixture of cyclohexanone and a co-solvent capable of swelling the TAC substrate, the diffusion particles are PMMA particles, and the difference in refractive index between the substrate and the diffusion particles is ≤0.

2.

2. The diffusion membrane according to claim 1, characterized in that, The particle size of the diffused particles is 1–10 μm.

3. The diffusion membrane according to claim 1, characterized in that, The co-solvent includes at least one of ethyl acetate, butyl acetate, methanol, isopropanol, propylene glycol methyl ether acetate, butanone, acetone, methyl isobutyl ketone, and propylene glycol methyl ether.

4. The diffusion membrane according to claim 1, characterized in that, The TAC substrate model is selected from at least one of Konica KC2UAW, Konica KC4UAW, Konica KC6UAW, Lucky, Fuji TG40UL, Fuji TJ25UL, Fuji TD60UL, Fuji TD80UL, Hyosung PG401S, Hyosung PG402S, Dahui P940RR, and Dahui P960RR.

5. A method for preparing a diffusion film as described in any one of claims 1 to 4, characterized in that, Includes the following steps: The diffusion particles and solvent are mixed according to the mass percentage of each component of the diffusion film to obtain a diffusion film mixed coating solution. Provide a substrate, apply the diffusion film mixture coating liquid to any surface of the substrate, and allow it to stand and level; A diffusion film is obtained by curing the material using a curing device.

6. The method for preparing the diffusion film according to claim 5, characterized in that, The mixing process includes using any one of the following methods: magnetic stirring, mechanical stirring, centrifugal stirring, and ultrasonic stirring, and the mixing time is 5–60 minutes; and / or, The coating process includes any one of the following methods: bar coating, blade coating, spin coating, roller coating, and dip coating; and / or, The curing process is carried out at a temperature of 45–100°C for 1–10 minutes.

7. The application of the diffusion film according to any one of claims 1 to 4 or the diffusion film prepared by the method of any one of claims 5 to 6 in a display module.

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