Fresnel projection screen and method of manufacturing the same

Abstract

The application discloses a Fresnel projection screen and a manufacturing method thereof, relates to the technical field of projection display, and aims to solve the problem of gain reduction of the Fresnel projection screen when the viewing angle of the Fresnel projection screen is increased. The Fresnel projection screen comprises a reflecting layer, a Fresnel lens layer, a surface layer and diffusion particles. The reflecting layer is used for reflecting light. The Fresnel lens layer is arranged in a laminated mode with the reflecting layer, and the surface of the Fresnel lens layer close to the reflecting layer side is provided with a Fresnel microstructure. The surface layer is arranged on the side of the Fresnel lens layer away from the reflecting layer. The diffusion particles are arranged in the surface layer. The absolute value of the difference between the refractive index of the surface layer and the refractive index of the diffusion particles is greater than zero and less than or equal to 0.5. The Fresnel projection screen is used for displaying a projection picture.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of projection display technology, in particular to a Fresnel projection screen and a manufacturing method thereof. BACKGROUND

[0002] In the field of projection display technology, a projector is generally used with a projection screen. Light emitted by the projector is projected onto the projection screen, and reaches the eyes of the audience after being reflected by the projection screen, so that the audience can watch the image formed by the light on the surface of the projection screen.

[0003] In order to improve the gain of the projection screen, the projector is generally used with a Fresnel projection screen. The Fresnel projection screen has the characteristics of high gain and small viewing angle. At present, when the viewing angle of the Fresnel projection screen is increased, the gain of the Fresnel projection screen will be reduced, thereby affecting the display effect. SUMMARY

[0004] The present application provides a Fresnel projection screen and a manufacturing method thereof, which are used to solve the problem of reduced gain of the Fresnel projection screen when the viewing angle of the Fresnel projection screen is increased.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] On the one hand, the present application provides a Fresnel projection screen, which comprises a reflection layer, a Fresnel lens layer, a surface layer and diffusion particles. The reflection layer is used to reflect light. The Fresnel lens layer is stacked with the reflection layer. The surface layer is stacked on the side of the Fresnel lens layer away from the reflection layer. The diffusion particles are arranged in the surface layer. The absolute value of the difference between the refractive index of the surface layer and the refractive index of the diffusion particles is greater than zero and less than or equal to 0.5.

[0007] The Fresnel projection screen provided by the present application is used. The light projected by the projector passes through the surface layer and the Fresnel lens layer in turn and then reaches the reflection layer. After being reflected by the reflection layer, the light is emitted from the side where the surface layer is located to the audience, so that the audience can watch the image on the Fresnel projection screen. When the external ambient light passes through the Fresnel lens layer, it will be reflected to the area not watched by the human eye, so that the Fresnel projection screen has a certain ability to resist ambient light. The surface layer can be used to protect the Fresnel projection screen and prevent the Fresnel projection screen from being damaged.

[0008] When the light projected by the projector passes through the diffusion particles at the surface layer, the light is diffused due to the difference between the refractive index of the diffusion particles and the refractive index of the surface layer, thereby increasing the viewing angle of the Fresnel projection screen. Meanwhile, the absolute value of the difference between the refractive index of the surface layer and the refractive index of the diffusion particles is less than or equal to 0.5, i.e., the refractive indices of the two are relatively close. In this way, when the light projected by the projector passes through the diffusion particles at the surface layer, the light has a high refractive index, and the light is not easy to reflect and directly exit the Fresnel projection screen from the surface layer. More light can enter the interior of the Fresnel projection screen and finally be reflected to the eyes of the audience, thereby ensuring the gain of the Fresnel projection screen.

[0009] In some embodiments, the material of the surface layer includes UV glue, and the material of the diffusion particles includes silicon dioxide.

[0010] In some embodiments, the diffusion particles include a particle body and a modification layer. The particle body is made of a silicon dioxide material. The modification layer coats the particle body, and the modification layer is similar to the material of the surface layer.

[0011] In some embodiments, the modification layer is a silane coupling agent coating the particle body, or the modification layer is polymethyl methacrylate grafted to the particle body.

[0012] In another aspect, the embodiments of the present application provide a method for manufacturing the Fresnel projection screen, and the method includes: manufacturing a surface layer; manufacturing a Fresnel lens layer on one side of the surface layer; manufacturing a reflection layer on the side of the Fresnel lens layer away from the surface layer; and wherein the surface layer is provided with the diffusion particles.

[0013] The technical effects of the method for manufacturing the Fresnel projection screen are the same as those of the Fresnel projection screen, and will not be repeated here.

[0014] In some embodiments, manufacturing the surface layer includes: blending the diffusion particles with UV glue to form a base material; and manufacturing the surface layer using the base material.

[0015] In some embodiments, before blending the diffusion particles with the UV glue to form the base material, manufacturing the surface layer further includes: coating a modification layer on the surface of the silicon dioxide particles to form the diffusion particles.

[0016] In some embodiments, coating the modification layer on the surface of the silicon dioxide particles to form the diffusion particles includes: adding the silicon dioxide particles to an ethanol solution to obtain a pre-solution; performing ultrasonic dispersion on the pre-solution; adding a silane coupling agent to the pre-solution to obtain a modified solution; performing ultrasonic dispersion on the modified solution; and performing ultrasonic cleaning, suction filtration, and drying on the modified solution to obtain the diffusion particles.

[0017] In some embodiments, coating the surface of silica particles with a modified layer to form diffusion particles includes: adding silica and methyl methacrylate to a polyvinyl alcohol solution to obtain a pre-solution; and adding benzoyl peroxide to the pre-solution to obtain diffusion particles.

[0018] In some embodiments, the mass ratio of polyvinyl alcohol solution, silica particles, and methyl methacrylate is 8:2:1. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a projection device in use, based on related technologies.

[0020] Figure 2 This is a schematic diagram illustrating the usage state of a projection device provided in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the overall structure of a Fresnel projection screen provided in an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the internal structure of a surface layer provided in an embodiment of this application;

[0023] Figure 5 A schematic diagram of another Fresnel projection screen provided in an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the structure of a surface layer provided in an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of another surface layer structure provided in an embodiment of this application;

[0026] Figure 8 for Figure 7 The diagram shows the structure of the microlens on the surface layer after atomization treatment.

[0027] Figure 9 A schematic diagram of another Fresnel projection screen provided in an embodiment of this application;

[0028] Figure 10 A schematic diagram of another Fresnel projection screen provided in the embodiments of this application;

[0029] Figure 11 A schematic diagram of another Fresnel projection screen provided in an embodiment of this application;

[0030] Figure 12 A schematic diagram of the structure of a Fresnel lens layer provided in an embodiment of this application;

[0031] Figure 13Another structure schematic diagram of a Fresnel lens layer provided by an embodiment of the present application is shown in FIG. 2.

[0032] Figure 14 A structure schematic diagram of a reflective layer provided by an embodiment of the present application is shown in FIG. 3.

[0033] Figure 15 Another structure schematic diagram of a reflective layer provided by an embodiment of the present application is shown in FIG. 4.

[0034] Figure 16 A flowchart of manufacturing a Fresnel projection screen provided by an embodiment of the present application is shown in FIG. 5. Figure 1 ;

[0035] Figure 17 A flowchart of manufacturing a Fresnel projection screen provided by an embodiment of the present application is shown in FIG. 6. Figure 2 ;

[0036] Figure 18 A flowchart of manufacturing a Fresnel projection screen provided by an embodiment of the present application is shown in FIG. 7. Figure 3 ;

[0037] Figure 19 A flowchart of manufacturing a Fresnel projection screen provided by an embodiment of the present application is shown in FIG. 8. Figure 4 ;

[0038] Figure 20 A flowchart of manufacturing a Fresnel projection screen provided by an embodiment of the present application is shown in FIG. 9. Figure 5 . DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] In the description of the present application, it should be understood that the terms “upper”, “lower”, “left”, “right”, “front”, “back”, “inner”, “outer”, “center” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In the embodiments of the present application, the terms "comprising", "containing" or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements not only includes those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0042] In the embodiments of the present application, the words "exemplary" or "for example" are used to mean serving as an example or illustration. Any embodiment or design presented as "exemplary" or "for example" in the embodiments of the present application should not be construed as preferred or advantageous over other embodiments or design proposals. Rather, the use of "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0043] In the field of projection display technology, especially in the field of ultra-short focus laser projection display, in order to achieve better brightness and display effect, the projector can be used with a Fresnel projection screen. As shown in Figure 1 , Figure 1 The overall structure of a projection device 010 of the related art in use is shown in the schematic diagram. The Fresnel projection screen 030 includes a Fresnel lens layer 031. The Fresnel lens layer 031 has a Fresnel microstructure, which can improve the gain of the Fresnel projection screen 030, and thus improve the display effect of the display picture.

[0044] As shown in Figure 1 , since the viewing angle of the Fresnel projection screen 030 is small, in order to improve the viewing angle, the Fresnel projection screen 030 can further include a diffusion layer 032, and the diffusion layer 032 is provided with diffusion particles 033. Thus, the light will be diffused after passing through the diffusion particles 033, and thus the viewing angle will be increased. However, the diffusion of the light will reduce the gain of the Fresnel projection screen 030. How to improve the viewing angle while reducing the reduction of the gain has become a problem to be solved at present.

[0045] Based on this, the embodiments of the present application provide a projection device, as shown in Figure 2 , Figure 2 The use state of a projection device 100 provided by the embodiments of the present application is shown in the schematic diagram. The projection device 100 can include a Fresnel projection screen 1 and a projector 2. The projector 2 is used to project light towards the Fresnel projection screen 1, and the Fresnel projection screen 1 is used to receive the light projected by the projector 2 and display a picture.

[0046] When the projection device 100 is in use, the projector 2 can be placed in front of and below the Fresnel projection screen 1, and the audience 3 is located in front of the Fresnel projection screen 1 and looking at the Fresnel projection screen 1. The incident light 21 emitted by the projector 2 shines on the Fresnel projection screen 1, and after being reflected by the Fresnel projection screen 1, the incident light 21 finally forms the outgoing light 22, which shines on the audience 3 and forms an image on the Fresnel projection screen 1.

[0047] Figure 2 The projector 2 shown may include a laser, which can be one of a monochromatic laser, a dual-color laser, or a tri-color laser. The tri-color laser can emit blue, red, and green laser light. The wavelength range of the emitted blue laser can be set to 430nm-460nm, the wavelength range of the emitted green laser can be set to 400nm-540nm, and the wavelength range of the emitted red laser can be set to 610nm-640nm.

[0048] Because tri-color lasers have the advantages of accurate color reproduction and a wide color gamut, the laser in the projector 2 provided in this embodiment can be a tri-color laser. Of course, the laser in the projector 2 provided in this embodiment can also be a monochromatic laser or a dual-color laser.

[0049] The specific structure of the Fresnel projection screen 1 provided in the embodiments of this application will be illustrated below.

[0050] like Figure 3 As shown, Figure 3 This is a schematic diagram of the overall structure of a Fresnel projection screen 1 provided in an embodiment of this application. The Fresnel projection screen 1 may include a reflective layer 11, a Fresnel lens layer 12, and a surface layer 13.

[0051] Reflective layer 11 is used to reflect light, such as Figure 3 As shown, the light projected by the projector 2 passes through the surface layer 13 and the Fresnel lens layer 12 in sequence before reaching the reflective layer 11. After being reflected by the reflective layer 11, the light is emitted again from the side where the surface layer 13 is located to the viewer 3, so that the viewer 3 can view the image on the Fresnel projection screen 1.

[0052] The Fresnel lens layer 12 and the reflective layer 11 are stacked together. The surface of the Fresnel lens layer 12 near the reflective layer 11 has Fresnel microstructures. When ambient light passes through the Fresnel microstructures, it is reflected to areas not viewed by the human eye, thus giving the Fresnel projection screen 1 a certain degree of resistance to ambient light.

[0053] Furthermore, the Fresnel microstructure also acts as a light convergent, resulting in higher gain for the Fresnel projection screen 1. Viewers directly facing the Fresnel projection screen 1 can see a brighter image.

[0054] The surface layer 13 is stacked on the side of the Fresnel lens layer 12 away from the reflective layer 11. The surface layer 13 can be used to protect the Fresnel projection screen 1 and prevent it from being damaged.

[0055] In addition, such as Figure 3 As shown, the Fresnel projection screen 1 may further include diffuse particles 131 disposed within the surface layer 13. The absolute value of the difference between the refractive index of the surface layer 13 and the refractive index of the diffuse particles 131 is greater than zero and less than or equal to 0.5.

[0056] It is known that when light passes through two media with similar refractive indices, it is more easily refracted, resulting in a higher refractive index. When light passes through two media with significantly different refractive indices, a higher proportion of the light is reflected.

[0057] Therefore, when the light projected by projector 2 passes through the diffuser particles 131 on surface layer 13, the light diffuses because the refractive index of the diffuser particles 131 is different from that of surface layer 13, thus increasing the viewing angle of Fresnel projection screen 1. Simultaneously, since the absolute value of the difference between the refractive index of surface layer 13 and the refractive index of diffuser particles 131 is less than or equal to 0.5, their refractive indices are relatively close. Thus, when the light projected by projector 2 passes through the diffuser particles 131 on surface layer 13, the light has a higher refractive index, making it less likely to be reflected and directly exit the Fresnel projection screen 1 from surface layer 13. More light can enter the interior of the Fresnel projection screen 1 and ultimately be reflected to the viewer's eye, ensuring the gain of the Fresnel projection screen 1.

[0058] When the absolute value of the difference between the refractive index of the surface layer 13 and the refractive index of the diffuser particles 131 is greater than zero and less than or equal to 0.5, it allows light to diffuse and also increases the transmittance of light when passing through the diffuser particles 131, thereby improving light utilization and ensuring the gain of the Fresnel projection screen 1. For example, the absolute value of the difference between the refractive index of the surface layer 13 and the refractive index of the diffuser particles 131 can be 0.5, 0.4, 0.3, or 0.2, etc.

[0059] In some embodiments, the surface layer 13 may be made of UV adhesive, and the diffusion particles 131 may be made of silicon dioxide. The UV adhesive material is flexible, and when the surface layer 13 is made of UV adhesive material, the surface layer 13 can be rolled up, thereby allowing the Fresnel projection screen 1 to be rolled up. When fabricating the surface layer 13, diffusion particles 131 can be added to the UV adhesive, and then cured using a UV light source to form the surface layer 13.

[0060] The refractive index of silicon dioxide is generally 1.45~1.55, while the refractive index of UV adhesive material is generally around 1.5. Since the refractive indices of the two are similar, it can ensure that more light from the projector 2 can enter the interior of the Fresnel projection screen 1, thus ensuring the light utilization rate of the projector 2 and thereby ensuring the gain of the Fresnel projection screen 1.

[0061] To allow light to refract when it passes through the diffuser particles 131, silica and UV adhesive with different refractive indices can be selected. For example, the silica used to make the diffuser particles 131 may have a refractive index of 1.46, and the UV adhesive material used to make the surface layer 13 may have a refractive index of 1.49. Of course, the surface layer 13 and the diffuser particles 131 can also be made of other materials with similar refractive indices.

[0062] In some embodiments, the particle size of the diffused particles 131 can be 200 nm to 400 nm. When the particle size of the diffused particles 131 is within the above range, the dispersion of the diffused particles 131 on the surface layer 13 is relatively good, and they can be well dispersed on the surface layer 13. For example, the particle size of the diffused particles 131 can be 200 nm, 300 nm, or 400 nm.

[0063] In some embodiments, the mass percentage of the diffuse particles 131 in the surface layer 13 can be 0.5% to 1%. When the percentage of diffuse particles 131 is too low, the number of diffuse particles 131 in the surface layer 13 is small, and some light will pass directly through the surface layer 13, failing to achieve a good diffusion effect.

[0064] Because of the poor compatibility between silica and UV adhesive materials, in order to better disperse the diffused particles 131 within the surface layer 13, in some embodiments, such as... Figure 4 As shown, Figure 4 This is a schematic diagram of the internal structure of a surface layer 13 provided in an embodiment of this application. The diffused particles 131 may include a particle body 132 and a modified layer 133. The particle body 132 may be made of silicon dioxide material, and the modified layer 133 covers the particle body 132, and the modified layer 133 is similar to and compatible with the material of the surface layer 13.

[0065] Because the modified layer 133 and the surface layer 13 are similar and compatible, the modified layer 133 is well-compatible with the surface layer 13, thus allowing the diffused particles 131 to be better dispersed within the surface layer 13, resulting in more uniform dispersion and better compatibility. Alternatively, the diffused particles 131 can also be silica particles; that is, silica particles can be directly added to the UV adhesive material during the fabrication of the surface layer 13 and then cured using a UV light source.

[0066] In some embodiments, the modified layer 133 can be a silane coupling agent coating the particle body 132. The silane coupling agent has an amphoteric structure, meaning it can chemically bond with both inorganic and organic materials. When the modified layer 133 is a silane coupling agent, it can chemically bond with both the particle body 132 and the material of the surface layer 13. This improves the compatibility between the diffusing particles 131 and the surface layer 13, allowing the diffusing particles 131 to be more uniformly dispersed on the surface layer 13, resulting in better light diffusion.

[0067] In other embodiments, the modified layer 133 may also be polymethyl methacrylate (PMMA) grafted onto the particle body 132. The UV adhesive and PMMA have good compatibility. When the modified layer 133 is PMMA grafted onto the particle body 132, the diffusing particles 131 can also be stably distributed within the surface layer 13, resulting in more uniform dispersion and a higher light diffusion effect.

[0068] The surface layer 13 of the Fresnel projection screen 1 can have different structures. Several different surface layers 13 provided in the embodiments of this application will be described exemplarily below with reference to the accompanying drawings.

[0069] like Figure 5 As shown, Figure 5 This is a schematic diagram of another Fresnel projection screen 1 provided in an embodiment of this application. In some embodiments, the surface of the surface layer 13 away from the Fresnel lens layer 12 can be a matte surface, which has a low reflectivity. Therefore, when the light projected by the projector 2 reaches this surface, more light passes through the surface and enters the Fresnel projection screen 1, improving the utilization rate of the light projected by the projector 2, ensuring the gain of the Fresnel projection screen 1, and also making it less likely for the light projected by the projector 2 to form a clear image in other places (such as the ceiling), thus ensuring the viewing experience of the audience 3.

[0070] At the same time, such as Figure 5 As shown, surface layer 13 is a frosted surface, which is an uneven surface. Light will be scattered when it reaches surface layer 13, thereby improving the viewing angle of Fresnel projection screen 1. The surface of surface layer 13 away from Fresnel lens layer 12 can be formed into a frosted surface by sandblasting, which is simple, convenient and easy to implement.

[0071] It is understandable that, although not in Figure 5 As shown in the figure, Figure 5 The surface layer 13 shown contains diffused particles 131. Figure 4This diffuses the light and improves the viewing angle of the Fresnel projection screen 1.

[0072] like Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of a surface layer 13 provided in an embodiment of this application. The surface layer 13 is distributed with diffused particles 131. When the number of diffused particles 131 is large, the diffused particles 131 can affect the flatness of the surface layer 13, increasing the unevenness of the surface of the surface layer 13 away from the Fresnel lens layer, thereby further increasing the refractive index of light at this surface, and thus improving the utilization rate of the light projected by the projector.

[0073] like Figure 7 As shown, Figure 7 This is a schematic diagram of another surface layer 13 provided in an embodiment of this application. In some embodiments, microlenses 40 are distributed on the surface of the surface layer 13 on the side away from the diffusion layer (left side). By setting the microlenses 40, the surface layer 13 forms uneven protrusions, which can increase the viewing angle of the projection screen, while reducing the surface reflectivity and improving the utilization rate of the light projected by the projector. The shape of the microlenses 40 can be hemispherical.

[0074] See Figure 8 , Figure 8 for Figure 7 The diagram shows the structure of the microlens 40 on the surface layer 13 after atomization treatment. In some embodiments, the surface of the microlens 40 can be atomized. By atomizing the surface of the microlens 40, the surface roughness can be further increased, thereby further reducing the reflectivity of light on the surface, resulting in higher light transmittance, which in turn improves the utilization efficiency of the light projected by the projector, ensures the gain effect, and also reduces the probability of forming a clear image elsewhere due to light reflection.

[0075] In some embodiments, such as Figure 9 As shown, Figure 9 This is a schematic diagram of another Fresnel projection screen 1 provided in an embodiment of this application. The Fresnel projection screen 1 may further include a coloring layer 14, in which dark dyes are distributed. When ambient light passes through the coloring layer 14, it can be absorbed by the dark dyes in the coloring layer 14, thereby giving the Fresnel projection screen 1 better resistance to ambient light.

[0076] Of course, such as Figure 5 As shown, in some embodiments, dark dye may also be distributed within the reflective layer 11. In this way, ambient light passing through the reflective layer 11 is absorbed by the dark dye within the reflective layer 11. Simultaneously, since the dark dye is distributed within the reflective layer 11, a separate coloring layer 14 is unnecessary.Figure 9 ), and thus the thickness of the Fresnel projection screen 1 can be reduced.

[0077] With reference to the foregoing Figure 9 In some embodiments, the Fresnel projection screen 1 can further include a substrate layer 15, which can be located between the surface layer 13 and the reflective layer 11. The substrate layer 15 can serve as a supporting base of the Fresnel projection screen 1.

[0078] The number of the substrate layers 15 can be set according to actual conditions. For example, as shown in FIG. 1, the Fresnel projection screen 1 can include two substrate layers 15, which can serve as a base for manufacturing the surface layer 13, the coloring layer 14 and the Fresnel lens layer 12. When manufacturing the surface layer 13, UV glue is applied to the surface of the substrate layer 15 away from the Fresnel lens layer 12, and then the UV glue is cured by a UV light source lamp, so that the manufacturing of the surface layer 13 is completed. Figure 9 As shown in FIG. 2, the number of the substrate layers 15 can also be one, which can be located between the Fresnel lens layer 12 and the surface layer 13, and can serve as a manufacturing base for manufacturing the Fresnel lens layer 12 and the surface layer 13.

[0079] Figure 3 As shown in FIG. 3, in some embodiments, the Fresnel projection screen 1 can further include an adhesive layer 16, which is located between the substrate layer 15 and the coloring layer 14. The coloring layer 14 and the substrate layer 15 can be bonded by the adhesive layer 16. For example, the adhesive layer 16 can be an optical transparent adhesive. Of course, in other embodiments, the Fresnel projection screen 1 can also not be provided with the adhesive layer 16, and as mentioned above, one of the substrate layers 15 can be directly used as a base to manufacture the coloring layer 14. In this way, the adhesive layer 16 is not needed for bonding.

[0080] As shown in FIG. 4, in some embodiments, the Fresnel projection screen 1 can further include an adhesive layer 16, which is located between the substrate layer 15 and the coloring layer 14. The coloring layer 14 and the substrate layer 15 can be bonded by the adhesive layer 16. For example, the adhesive layer 16 can be an optical transparent adhesive. Of course, in other embodiments, the Fresnel projection screen 1 can also not be provided with the adhesive layer 16, and as mentioned above, one of the substrate layers 15 can be directly used as a base to manufacture the coloring layer 14. In this way, the adhesive layer 16 is not needed for bonding. Figure 9 As shown in FIG. 5, in some embodiments, the Fresnel projection screen 1 can further include an adhesive layer 16, which is located between the substrate layer 15 and the coloring layer 14. The coloring layer 14 and the substrate layer 15 can be bonded by the adhesive layer 16. For example, the adhesive layer 16 can be an optical transparent adhesive. Of course, in other embodiments, the Fresnel projection screen 1 can also not be provided with the adhesive layer 16, and as mentioned above, one of the substrate layers 15 can be directly used as a base to manufacture the coloring layer 14. In this way, the adhesive layer 16 is not needed for bonding.

[0081] As shown in FIG. 6, in some embodiments, the Fresnel projection screen 1 can further include an adhesive layer 16, which is located between the substrate layer 15 and the coloring layer 14. The coloring layer 14 and the substrate layer 15 can be bonded by the adhesive layer 16. For example, the adhesive layer 16 can be an optical transparent adhesive. Of course, in other embodiments, the Fresnel projection screen 1 can also not be provided with the adhesive layer 16, and as mentioned above, one of the substrate layers 15 can be directly used as a base to manufacture the coloring layer 14. In this way, the adhesive layer 16 is not needed for bonding. Figure 10 Figure 10 As shown in FIG. 7, the Fresnel projection screen 1 provided by the embodiments of the present application is another structural schematic diagram of the Fresnel projection screen 1. Figure 10 As shown in FIG. 8, the Fresnel projection screen 1 is provided with two substrate layers 15. The two substrate layers 15 are located between the Fresnel lens layer 12 and the surface layer 13. The surface of the substrate layer 15 close to the surface layer 13 and away from the surface layer 13 is provided with a light-transmitting protrusion 151. When the light passes through the light-transmitting protrusion 151, the light is diffused, so that the viewing angle of the Fresnel projection screen 1 is increased. At the same time, the coherence between the lights is reduced due to the diffusion of the lights, so that the severity of the speckle formed on the projection screen 1 is reduced. The light-transmitting protrusion 151 can be a columnar lens, as shown in FIG. 9. Figure 10 ​​The cross section of the light-transmitting protrusion 151 along the plane perpendicular to the extending direction of the light-transmitting protrusion 151 can be semicircular, i.e., the light-transmitting protrusion 151 is semicylindrical.

[0082] In some embodiments, referring to Figure 11 , Figure 11 Fig. 6 is a schematic structural diagram of another Fresnel projection screen 1 provided by the embodiments of the present application. The two substrate layers 15 are provided with light-transmitting protrusions 151 on the two surfaces close to each other. Similarly, the shape of the light-transmitting protrusion 151 can also be semicylindrical. For example, the extending directions of the light-transmitting protrusions 151 on the two substrate layers 15 can be perpendicular to each other.

[0083] Generally, the Fresnel projection screen 1 is rectangular. Referring to Figure 11 , Figure 11 , the up-down direction is the width direction of the projection screen 1, i.e., the vertical direction of the audience 3 watching. The direction perpendicular to the plane shown in Figure 11 is the length direction of the projection screen 1, i.e., the horizontal direction of the audience watching. Thus, the light-transmitting protrusions 151 of the left substrate layer 15 extend along the length direction of the Fresnel projection screen 1. In this way, when the light passes through the light-transmitting protrusions 151, the light will be diffused along the width direction of the projection screen 1, thereby increasing the viewing angle of the projection screen 1 in the vertical direction. The light-transmitting protrusions 151 of the right substrate layer 15 extend along the width direction of the Fresnel projection screen 1. In this way, when the light passes through the light-transmitting protrusions 151, the light will be diffused along the length direction of the Fresnel projection screen 1, thereby increasing the viewing angle of the projection screen 1 in the horizontal direction.

[0084] The substrate layer 15 can also be made of different materials. For example, the substrate layer 15 can be made of polyethylene terephthalate (PET) material. The PET material is flexible, and thus the substrate layer 15 is flexible and can be rolled up. Of course, the substrate layer 15 can also be made of other flexible materials, for example, the substrate layer 15 can be made of thermoplastic polyurethane elastomer rubber (TPU) material, which has elasticity and can be rolled up. Alternatively, the substrate layer 15 can also be made of styrenic block copolymers (SBC) flexible material. For another example, the substrate layer 15 can also be made of MS material.

[0085] The MS material is hard and cannot be rolled up, and has good flatness, thereby making the projection screen have good flatness. The TPU has a wide hardness range, and increasing the hardness can still maintain good elasticity and wear resistance, and has good oil resistance, aging resistance and wear resistance, and low cost.

[0086] SBC material exhibits good flexibility and mechanical properties, is waterproof, and possesses higher tensile strength, tear strength, and spherical bursting strength than MS material. It also demonstrates good oxidation resistance, waterproofing, weather resistance, chemical resistance, and corrosion resistance. The material's rough lower surface and three-dimensional network structure provide excellent adhesion to various adhesives and allow for blending with other materials to improve performance and strength.

[0087] For example, the substrate layer 15 can also be made of polyurethane (PU), polyethylene (PE), polyvinyl chloride (PVC), or polypropylene (PP). Among these, PU can adapt to substrates with different coefficients of thermal expansion, forming a soft-hard transition layer with the substrate, resulting in strong adhesion. Therefore, it exhibits better bonding with other layered structures of the projection screen. Furthermore, it possesses excellent cushioning and shock absorption capabilities.

[0088] PE material is odorless, non-toxic, and has a waxy feel. It possesses excellent low-temperature resistance, good chemical stability, and resistance to most acids and alkalis. It is insoluble in common solvents at room temperature, has low water absorption, and excellent electrical insulation properties.

[0089] PVC materials offer good dimensional stability, weather resistance, and relatively low cost. Furthermore, the hardness of PVC materials can be adjusted using plasticizers. PP materials are easy to dye, lightweight, tough, and have good temperature and chemical resistance.

[0090] Furthermore, the Fresnel lens layer in the projection screen provided in this application embodiment can also have different structures. The following description, in conjunction with the accompanying drawings, provides exemplary examples of several different Fresnel lens layer structures.

[0091] In some embodiments, see Figure 12 , Figure 12 This is a schematic diagram of a Fresnel lens layer 12 provided in an embodiment of this application. Second diffuser particles 121 are distributed within the Fresnel lens layer 12. By distributing the second diffuser particles 121 within the Fresnel lens layer 12 to expand the viewing angle, the viewing angle of the Fresnel projection screen can be further increased. The absolute value of the difference between the refractive index of the second diffuser particles 121 and the refractive index of the Fresnel lens layer 12 material can also be less than 0.5. This improves the light transmittance, thereby enhancing light utilization efficiency.

[0092] In some embodiments, see Figure 13 , Figure 13Another structure diagram of the Fresnel lens layer 12 provided by the embodiment of the present application is shown. The Fresnel lens layer 12 is provided with a micro-lens 40 on the surface of the side of the Fresnel micro-structure. By setting the micro-lens 40, the light can be diffused, so that the viewing angle of the projection screen is enlarged. At the same time, the coherence between the diffused light is reduced, and thus the severity of the speckle formed on the projection screen can be reduced.

[0093] As known from the above, the reflection layer can reflect light. In order to realize the reflection function of the reflection layer, the reflection material in the reflection layer can also be aluminum, silver, or a combination of silver and aluminum. In order to better reflect light, materials of different shapes can be selected as the material of the reflection layer. In the following, taking aluminum as the reflection material as an example, several different reflection layers provided by the embodiment of the present application are exemplarily described in combination with the drawings.

[0094] In some embodiments, as shown in Figure 14 , Figure 14 A structure diagram of a reflection layer 11 provided by the embodiment of the present application is shown. In order to improve the gain of the Fresnel projection screen 1, powder-like aluminum powder can be selected, and a spraying printing or evaporation method is used to coat the Fresnel lens layer 12. In this way, because the powder-like aluminum powder is more delicate and has no obvious directivity, most of the light emitted by the projector can be directed to reflect out of the projection screen according to the setting of the micro-structure of the Fresnel lens layer 12, and will not cause the light to reflect everywhere. Therefore, the gain of the projection screen is higher.

[0095] In addition, when aluminum particles are selected as the reflection material, the diameter of the aluminum particles can be in the range of 5um to 20um. The aluminum particles in this range have a small diameter, and after forming the reflection layer 11, the aluminum particles form a dense reflection surface. When light is incident on the reflection surface, the light can be reflected as much as possible, thereby avoiding the waste of light energy. At the same time, when aluminum particles are selected as the reflection material, the reflection layer 11 can be made very thin, thereby saving the consumption of aluminum material and saving the production cost.

[0096] In other embodiments, as shown in Figure 15 , Figure 15 A structure diagram of another reflection layer 11 provided by the embodiment of the present application is shown. When the reflection material of the reflection layer 11 is aluminum, flaky aluminum powder can also be selected. The flaky aluminum powder is sprayed on the Fresnel lens layer 12 by a spraying printing method. Because the flaky aluminum powder has a large diameter-thickness ratio and strong aluminum binding ability, it is not easy to fall off. The diameter-thickness ratio of the flaky aluminum powder can be in the range of (40:1) to (100:1).

[0097] On the other hand, the embodiment of the present application provides a manufacturing method for manufacturing the above-mentioned Fresnel projection screen, as shown in Figure 16 .Figure 16 The flowchart for manufacturing the Fresnel projection screen provided by the embodiment of the present application Figure 1 The manufacturing method comprises steps S100-S300.

[0098] S100: manufacturing the surface layer.

[0099] For example, as shown in the Fresnel projection screen 1, Figure 3 As shown in the Fresnel projection screen 1, Figure 3 The Fresnel projection screen 1 has a substrate layer 15. When the surface layer 13 is manufactured, the surface layer 13 can be manufactured on the surface of one side of the substrate layer 15.

[0100] S200: manufacturing the Fresnel lens layer on the side of the surface layer.

[0101] When the Fresnel lens layer 12 is manufactured, the UV glue can be selected to solidify to form the Fresnel lens layer 12. Because the UV glue has elasticity, the Fresnel lens layer 12 can be curled. For reference, Figure 3 For example, as shown in the Fresnel projection screen 1, Figure 3 When the Fresnel lens layer 12 is manufactured, the UV glue can be coated on the surface of the side of the substrate layer 15 away from the surface layer 13, then a special mold is used to emboss the Fresnel lens layer 12 to shape the Fresnel lens layer 12, and then the UV glue is cured by using a UV light source lamp, and finally the Fresnel lens layer 12 is manufactured by demolding.

[0102] The manufacturing sequence of the surface layer 13 and the Fresnel lens layer 12 can be different. For example, the surface layer 13 can be manufactured on the surface of one side of the substrate layer 15 first, and then the Fresnel lens layer 12 is manufactured on the surface of the other side of the substrate layer 15. Or, the Fresnel lens layer 12 is manufactured on the surface of one side of the substrate layer 15 first, and then the surface layer 13 is manufactured on the surface of the other side of the substrate layer 15.

[0103] S300: manufacturing the reflection layer on the side of the Fresnel lens layer away from the surface layer.

[0104] Continuing to refer to Figure 3 When the reflection layer 11 is manufactured, the reflection material can be sprayed on the Fresnel lens layer 12 by using the spraying printing method to complete the manufacturing of the reflection layer 11.

[0105] For example, as shown in the Fresnel projection screen 1, Figure 3As shown in FIG. 1, the surface layer 13 is provided with diffusion particles 131. Since the refractive index of the diffusion particles 131 is different from the refractive index of the surface layer 13, the light rays are diffused, thereby increasing the viewing angle of the Fresnel projection screen 1. Meanwhile, since the absolute value of the difference between the refractive index of the surface layer 13 and the refractive index of the diffusion particles 131 is less than or equal to 0.5, the refractive index of the light rays projected by the projector 2 is higher when the light rays pass through the diffusion particles 131, thereby ensuring a higher utilization rate of the light rays projected by the projector 2, and further ensuring the gain of the Fresnel projection screen 1.

[0106] When the material of the surface layer comprises UV glue and the material of the diffusion particles comprises silica, as shown in FIG. 2, Figure 17 as shown in FIG. 2, Figure 17 a process for manufacturing the Fresnel projection screen provided by the embodiment of the present application is shown in FIG. 3. Figure 2 The surface layer is manufactured by steps S110-S120.

[0107] S110: The diffusion particles are blended with the UV glue to form a base material.

[0108] In order to make the diffusion particles better dispersed in the UV glue, the base material can be physically stirred to make the diffusion particles uniformly dispersed in the UV glue.

[0109] S120: The surface layer is manufactured using the base material.

[0110] Therefore, the surface layer formed by the base material is distributed with the diffusion particles. When the light rays pass through the diffusion particles, the light rays are diffused, thereby increasing the viewing angle of the Fresnel projection screen.

[0111] When the diffusion particles comprise a particle body made of silica and a modified layer covering the particle body, as shown in FIG. 4, Figure 18 as shown in FIG. 4, Figure 18 a process for manufacturing the Fresnel projection screen provided by the embodiment of the present application is shown in FIG. 5. Figure 3 Before the diffusion particles are blended with the UV glue to form a base material, the surface layer is further manufactured by step S10.

[0112] S10: A modified layer is coated on the surface of the silica particles to form the diffusion particles.

[0113] The modified layer is similar to the material of the surface layer and is compatible with the material of the surface layer. In this way, under the action of the modified layer, the diffusion particles are better compatible with the material of the surface layer, thereby making the diffusion particles more uniformly dispersed in the material of the surface layer.

[0114] When the modified layer is a silane coupling agent covering the particle body, as shown in FIG. 6, Figure 19 as shown in FIG. 6, Figure 19A flowchart illustrating the fabrication process of a Fresnel projection screen provided in this application embodiment. Figure 4 The process of coating a modified layer onto the surface of silica particles to form diffuse particles includes steps S20 to S60.

[0115] S20: Add silica particles to an ethanol solution to obtain a pretreatment solution.

[0116] S30: Ultrasonic dispersion of the pretreatment solution.

[0117] By ultrasonically dispersing the pretreatment solution, silica particles can be uniformly dispersed in the ethanol solution, resulting in a more even dispersion. The ultrasonic dispersion time can be set according to specific conditions. For example, the ultrasonic dispersion time can be no less than two hours. This ensures that the silica particles are uniformly dispersed in the ethanol solution.

[0118] S40: Add a silane coupling agent to the pre-solution to obtain a modified solution.

[0119] When a silane coupling agent is added to the pretreatment solution, it chemically bonds with the silica particles, coating their surface and forming a modified layer of diffused particles. The silane coupling agent can be selected from different types depending on the specific requirements. For example, the silane coupling agent can be KH-570, i.e., γ-methacryloyloxypropyltrimethoxysilane.

[0120] S50: Ultrasonic dispersion of the modified solution.

[0121] After ultrasonic dispersion of the modified solution, the silane coupling agent can be fully combined with the silica particles, thereby improving the binding efficiency between the silane coupling agent and the silica particles.

[0122] S60: Diffused particles are obtained by ultrasonic cleaning, filtration and drying of the modified solution.

[0123] After the silane coupling agent is fully bonded to the silica particles, ultrasonic cleaning removes excess silane coupling agent and other impurities from the modified solution, facilitating subsequent extraction. Finally, the modified silica particles are separated and dried by filtration and drying.

[0124] When the modified layer is polymethyl methacrylate grafted onto the particle matrix, such as Figure 20 As shown, Figure 20 A flowchart illustrating the fabrication process of a Fresnel projection screen provided in this application embodiment. Figure 5 The process of coating a modified layer onto the surface of silica particles to form diffused particles includes steps S70 to S80.

[0125] S70: adding silica and methyl methacrylate into the polyvinyl alcohol solution to obtain a pre-solution.

[0126] At this time, the silica in the polyvinyl alcohol solution can be combined with the methyl methacrylate, and the methyl methacrylate can be grafted onto the silica.

[0127] S80: adding dibenzoyl peroxide into the pre-solution to obtain diffusion particles.

[0128] After adding the dibenzoyl peroxide into the pre-solution, the methyl methacrylate will undergo a polymerization reaction to form polymethyl methacrylate. Since the polymethyl methacrylate is similar to the UV glue and is compatible with the UV glue, it can ensure that the diffusion particles can be uniformly dispersed in the UV glue.

[0129] In some embodiments, the mass ratio of the polyvinyl alcohol solution, the silica particles, and the methyl methacrylate can be 8:2:1. Using the above ratio to make the diffusion particles can enable the methyl methacrylate to be fully grafted onto the silica particles and fully polymerized to form polymethyl methacrylate, and the material utilization is more sufficient.

[0130] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any change or replacement within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for manufacturing a Fresnel projection screen, characterized in that, The method includes: Create a surface layer; A Fresnel lens layer is fabricated on one side of the surface layer; and, A reflective layer is formed on the side of the Fresnel lens layer away from the surface layer; The surface layer contains diffused particles; The method further includes: Add silica and methyl methacrylate to a polyvinyl alcohol solution to obtain a pretreatment solution; The diffused particles are obtained by adding benzoyl peroxide to the pretreatment solution.

2. The method according to claim 1, characterized in that, The surface layer is made of UV adhesive; the surface layer is fabricated by: The diffused particles are blended with the UV adhesive to form a substrate material; The surface layer is made using the substrate material.

3. The method according to claim 1, characterized in that, The mass ratio of the polyvinyl alcohol solution, the silica particles, and the methyl methacrylate is 8:2:

1.

4. The method according to claim 1, characterized in that, The absolute value of the difference between the refractive index of the surface layer and the refractive index of the diffused particles is greater than zero and less than or equal to 0.5.

Images