Projection screen and projection device

Abstract

The utility model discloses a projection screen and a projection device, relates to the technical field of projection display, and is used for solving the problems that an existing projection screen is complex in process and high in manufacturing cost. The projection screen comprises a substrate layer, a functional layer and a plurality of reflective particles. The functional layer is stacked on the surface of one side of the base material layer, and a plurality of cavities are formed in the functional layer. The plurality of reflective particles are respectively disposed in the plurality of cavities. The reflection particles are used for reflecting the projection light and the ambient light, so that the projection light is reflected towards the position where the audience is located, and the ambient light is reflected towards the position deviating from the audience. The projection screen is used for displaying a projection picture.

Description

Technical Field

[0001] The present application relates to the field of projection display technology, and in particular to a projection screen and a projection device. Background Art

[0002] In the field of projection display technology, projectors are generally used in conjunction with projection screens. The light emitted by the projector is projected onto the projection screen, and after being reflected by the projection screen, it reaches the audience's eyes, and the audience can then see the image formed by the light on the surface of the projection screen.

[0003] Existing projection screens usually include a multi-layer structure including a substrate layer, an optical microstructure layer, a reflective layer, a light absorbing layer, a scattering layer, and the like.

[0004] The existing projection screen has complex manufacturing process and high production cost. Utility Model Content

[0005] The present application provides a projection screen and a projection device, which are used to solve the problems of complex process and high production cost of existing projection screens.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] On the one hand, the embodiment of the present application provides a projection screen and a projection device, including a substrate layer, a functional layer and a plurality of reflective particles. The functional layer is stacked on a surface of one side of the substrate layer, and a plurality of cavities are formed inside the functional layer. The plurality of reflective particles are respectively arranged in the plurality of cavities. The reflective particles are used to reflect the projection light and the ambient light, so that the projection light is reflected toward the position of the audience, and the ambient light is reflected toward the position away from the audience.

[0008] The projection screen and projection device provided in the embodiments of the present application can reflect the projection light projected by the projector to the position of the audience through the setting of reflective particles during use, and can also reflect the ambient light to the position away from the audience. The projection screen as a whole only includes the substrate layer, the functional layer and the reflective particles set in the internal cavity of the functional layer, and the audience can clearly see the picture projected by the projector. The projection screen can have a good anti-light effect without setting a multi-layer structure, and the projection screen has a simple process and low production cost.

[0009] In some embodiments, the reflective particles are hollow structures so that projection light and ambient light are refracted after entering the reflective particles from one side, reflected when transmitted to the inner wall on the other side of the reflective particles, and re-emitted from the side where the projection light and ambient light entered.

[0010] In some embodiments, the reflective particles are hollow spherical structures, and the outer wall of the reflective particles and the inner wall of the reflective particles are spherical surfaces with the same center, so that the incident direction of the projection light and the ambient light is parallel to the outgoing direction after being reflected by the reflective particles.

[0011] In some embodiments, the particle size of the reflective particles is greater than or equal to 1 μm, and the particle size of the reflective particles is less than or equal to 100 μm.

[0012] In some embodiments, at least a portion of the reflective particles are made of glass material.

[0013] In some embodiments, the plurality of cavities include a plurality of first cavities and a plurality of second cavities. The plurality of reflective particles are respectively disposed in the plurality of first cavities. The projection screen further includes a plurality of metal reflective particles. The plurality of metal reflective particles are respectively disposed in the plurality of second cavities.

[0014] In some embodiments, the plurality of cavities include a plurality of first cavities and a plurality of third cavities. The plurality of reflective particles are respectively disposed in the plurality of first cavities. The projection screen further includes a plurality of diffusion particles. The plurality of diffusion particles are respectively disposed in the plurality of third cavities, and the diffusion particles are used to diffuse the projection light passing through the diffusion particles.

[0015] In some embodiments, a ratio of the mass of the reflective particles to the mass of the plurality of diffusion particles is greater than or equal to 20, and a ratio of the mass of the plurality of reflective particles to the mass of the plurality of diffusion particles is less than or equal to 40.

[0016] In some embodiments, the cavity includes a plurality of first cavities and a plurality of fourth cavities. The plurality of reflective particles are respectively disposed in the plurality of first cavities. The projection screen further includes a plurality of pigment particles, and the plurality of pigment particles are respectively disposed in the plurality of fourth cavities. The pigment particles are used to absorb ambient light passing through the pigment particles.

[0017] On the other hand, an embodiment of the present application further provides a projection device, which includes a projector and any one of the above-mentioned projection screens. The projector is located on one side of the projection screen. The projector is used to emit projection light toward the projection screen, and the projection screen is used to reflect the projection light projected by the projector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of imaging principle of a projection display device in a related technology;

[0019] Figure 2 Schematic diagram of the light path of specular reflection and diffuse reflection;

[0020] Figure 3 It is a structural schematic diagram of a projection display device in another related technology;

[0021] Figure 4It is one of the structural schematic diagrams of the anti-light projection screen in another related technology;

[0022] Figure 5 The second structural schematic diagram of the anti-light projection screen in another related technology;

[0023] Figure 6 The third structural schematic diagram of the anti-light projection screen in another related technology;

[0024] Figure 7 is a schematic diagram of the structure of a black grid layer in the related art;

[0025] Figure 8 A schematic diagram of the use status of the projection device provided in an embodiment of the present application;

[0026] Fig. 9 One of the structural schematic diagrams of the projection screen provided in the embodiment of the present application;

[0027] Fig.10 A light path diagram of the reflective particles provided in an embodiment of the present application;

[0028] Fig.11 A schematic diagram of the light reflection path of the projection screen provided in an embodiment of the present application;

[0029] Fig.12 The second structural schematic diagram of the projection screen provided in the embodiment of the present application;

[0030] Fig.13 The third structural schematic diagram of the projection screen provided in the embodiment of the present application;

[0031] Fig.14 A fourth structural schematic diagram of a projection screen provided in an embodiment of the present application;

[0032] Fig.15 A fifth structural diagram of a projection screen provided in an embodiment of the present application;

[0033] Fig.16 This is the sixth structural schematic diagram of the projection screen provided in the embodiment of the present application.

[0034] Reference numerals:

[0035] 200-projection display device; 210-projection screen; 220-projector; 300-projection display device; 310-light-resistant projection screen; 311-functional layer; 3111-Fresnel lens layer; 312-reflection layer; 313-diffusion layer; 3131-first diffusion particles; 314-surface layer; 3141-second diffusion particles; 320-projector; 321-incident light; 315-black grid layer; 3151-reflection layer; 3152-parallel layer; 322-exiting light; 330-audience; 100-projection device; 1-projection screen; 11-substrate layer; 12-functional layer; 13-reflection particles; 14-metal reflective particles; 15-diffusion particles; 16-pigment particles; 2-projector; 21-incident light; 22-exiting light; 3-audience. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] In the description of the present application, it should be understood that the terms, "up", "down", "left", "right", "front", "back", "inside", "outside", "center", etc., indicating the orientation or position relationship are based on the orientation or position 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 specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0039] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" means one or more, and "multiple" means two or more.

[0040] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0041] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0042] The projection screen is one of the essential accessories for projection display equipment. A projection display device needs a good projection screen to achieve good projection effects.

[0043] like Figure 1 As shown, Figure 1 This is a schematic diagram of an imaging principle of a projection display device 200 in a related art. The surface of the projection screen 210 is usually provided with a coating, and this coating reflects light. The process of the coating reflecting light usually includes diffuse reflection and directional reflection.

[0044] like Figure 2 As shown, Figure 2 is a schematic diagram of the specular reflection and diffuse reflection light path, such as Figure 2 As shown in the light path diagram on the right, diffuse reflection is caused by the unevenness of the reflective surface. The reflected light of diffuse reflection is scattered in all directions, the light is not concentrated, and the brightness is usually low, but the reflection range is wide. Figure 2 As shown in the light path diagram on the left, specular reflection is the opposite of diffuse reflection. The light reflected by specular reflection is concentrated and the brightness is usually higher, but the reflection range is smaller.

[0045] When the ratio of diffuse reflection to specular reflection emitted by the projector 220 to the projection screen 210 increases, the viewing angle of the projection screen 210 increases, and the brightness of the picture on the projection screen 210 decreases. Correspondingly, when the ratio of diffuse reflection to specular reflection emitted by the projector 220 to the projection screen 210 decreases, the viewing angle of the projection screen 210 decreases, and the brightness of the picture on the projection screen 210 increases.

[0046] As the use of projection display devices becomes more and more widespread, users often use projection display devices in bright places. The images viewed by users are formed by the projection light reflected by the projection screen. The projection screen reflects the ambient light while reflecting the projection light. The ambient light affects the clarity of the projection light, making it difficult for users to see the projection image clearly.

[0047] In order to solve the above problems, in the related art, projection display devices usually use anti-light projection screens, which can reduce the interference of ambient light and ensure the clarity of the projection screen image.

[0048] In related technologies, such as Figure 3 As shown, Figure 3 3 is a schematic diagram of the structure of a projection display device 300 in another related art. The projection display device 300 may include an anti-light projection screen 310 and a projector 320. The projector 320 is located on one side of the anti-light projection screen 310 and emits projection light toward the anti-light projection screen 310.

[0049] like Figure 3 As shown, when the projection display device 300 is in use, the projector 320 can be placed in front of and below the anti-light projection screen 310, and the audience 330 is located in front of the anti-light projection screen 310 and looks at the anti-light projection screen 310. The incident light 321 emitted by the projector 320 is directed toward the anti-light projection screen 310, and the incident light 321 is reflected by the anti-light projection screen 310 and finally forms an outgoing light 322 that is directed toward the audience 330, while forming an image in the anti-light projection screen 310.

[0050] like Figure 4 As shown, Figure 4 1 is one of the structural schematic diagrams of an anti-glare projection screen 310 in another related art. The anti-glare projection screen 310 may include a functional layer 311 and a reflective layer 312. The reflective layer 312 may be used to reflect light. The functional layer 311 is stacked on one side of the reflective layer 312.

[0051] The functional layer 311 may include a Fresnel lens layer 3111 . The Fresnel lens layer 3111 is stacked on one side of the reflective layer 312 .

[0052] like Figure 4 As shown, the surface of the Fresnel lens layer 3111 close to the reflective layer 312 has a Fresnel microstructure 3112. When the external ambient light passes through the Fresnel microstructure 3112, it will be reflected to the area not viewed by the human eye, so that the anti-light projection screen 310 has a certain ability to resist ambient light.

[0053] like Figure 4As shown, the functional layer 311 may further include a diffusion layer 313. The diffusion layer 313 is stacked and arranged on a side of the Fresnel lens layer 3111 away from the reflection layer 312. The diffusion layer 313 has first diffusion particles 3131 distributed therein. The first diffusion particles 3131 are generally made of organic silicon material or polymethyl methacrylate (PMMA) material.

[0054] When the light emitted by the projector 320 passes through the diffusion layer 313 , the first diffusion particles 3131 in the diffusion layer 313 can diffuse the light emitted by the projector 320 , thereby improving the viewing angle of the anti-glare projection screen 310 .

[0055] like Figure 4 As shown, the functional layer 311 may further include a surface layer 314. The surface layer 314 is stacked on a side of the diffusion layer 313 away from the Fresnel lens layer 3111. The surface layer 314 may serve as a protective layer for the anti-light projection screen 310, and play a protective role for the anti-light projection screen 310.

[0056] like Figure 5 As shown, Figure 5 The second structural schematic diagram of the anti-light projection screen 310 in another related art is that the surface of the surface layer 314 away from the Fresnel lens layer 3111 can be a matte surface, and the light reflectivity of the matte surface is low. Therefore, when the light projected by the projector 320 reaches the surface, more light will pass through the surface and enter the anti-light projection screen 310, so that the light projected by the projector 320 is not easy to form a clear image in other places (such as the ceiling), ensuring the viewing experience of the audience 330.

[0057] Second diffusion particles 3141 may be distributed inside the surface layer 314. The second diffusion particles 3141 may play the same role as the first diffusion particles 3131, thereby ensuring the viewing angle of the anti-glare projection screen 310 in the related art.

[0058] like Figure 6 As shown, Figure 6 This is another structural schematic diagram of an anti-glare projection screen 310 in the related art. In the related art, at least a portion of the second diffusion particles 3141 inside the surface layer 314 is close to the surface of the surface layer 314 on the side away from the Fresnel lens layer 3111. In this way, the second diffusion particles 3141 can reduce the flatness of the surface of the surface layer 314 on the side away from the Fresnel lens layer 3111, so that the surface of the surface layer 314 on the side away from the Fresnel lens layer 3111 forms a fogged surface.

[0059] It is understood that in the related art, the surface layer 314 can also form an atomized surface by other means. Figure 5As shown, the surface layer 314 is away from the side of the Fresnel lens layer 3111 (i.e. Figure 5 The surface of the image (on the left side in the middle) can be processed by sandblasting to form an atomized surface, which is simple, convenient and easy to implement.

[0060] In other related technologies, the anti-glare projection screen 310 may further include a black grid layer 315. Figure 7 As shown, Figure 7 Schematic diagram of the structure of the black grid layer 315 in the related art. The surface of the black grid layer 315 facing the projection light has a special optical microstructure with parallel prisms made by a special process and a sawtooth cross section.

[0061] The prism is black and white. The white inclined surface of the prism is the reflective layer 3151. The projection light is projected from bottom to top onto the white reflective layer 3151 and then reflected into our eyes, while the interfering light from above will be absorbed by the black parallel layer 3152. Therefore, the black grid layer 315 can improve the ability of the anti-light projection screen to resist the interference of light from the top.

[0062] In summary, in the related art, the projection screen is made of a multi-layer structure, each layer has a complex structure, the production process of the projection screen is complex, and the production cost is high.

[0063] Based on this, the present application provides a projection device 100, such as Figure 8 As shown, Figure 8 The present invention is a schematic diagram of a projection device 100 in use according to an embodiment of the present invention, wherein the projection device 100 comprises a projection screen 1 and a projector 2. The projector 2 is located on one side of the projection screen 1, and the projector 2 is used to emit projection light toward the projection screen 1, and the projection screen 1 is used to reflect the projection light projected by the projector 2.

[0064] In this way, the projection screen 1 can reflect the projection light projected by the projector 2 into a certain area for the convenience of viewing by users.

[0065] For example, Figure 8 As shown, the projector 2 is located in front of and below the projection screen 1, and the audience 3 is located in front of the projection screen 1 and looks at the projection screen 1. The incident light 21 emitted by the projector 2 photographs the projection screen 1, and the incident light 21 is reflected by the projection screen 1 and finally forms an outgoing light 22 that shines on the audience 3, while forming an image on the projection screen 1.

[0066] In actual application, the projector 2 may include a laser, which may be one of a monochromatic laser, a two-color laser and a three-color laser, wherein the three-color laser may emit a blue laser, a red laser and a green laser.

[0067] The wavelength range of the blue laser emitted by the three-color laser can be set to 430nm-460nm, the wavelength range of the green laser emitted can be set to 500nm-540nm, and the wavelength range of the red laser emitted can be set to 610nm-650nm. Of course, the projector 2 can also be a projector 2 that emits ordinary light, as long as the light emitted by the projector 2 can be clearly imaged in the human eye after being reflected by the projection screen 1.

[0068] The projection screen 1 provided in the embodiment of the present application is introduced below. Fig. 9 As shown, Fig. 9 This is one of the structural schematic diagrams of the projection screen 1 provided in the embodiment of the present application, and the projection screen 1 may include a substrate layer 11. The substrate layer 11 may serve as a supporting basis in the entire projection screen 1, and may also serve as a base for manufacturing other layers.

[0069] In some embodiments, the substrate layer 11 can be made of a flexible material, and the remaining layers of the projection screen 1 can also be made of a flexible material. In this way, after the projection screen 1 is manufactured, the entirety is flexible and can be rolled up for easy transportation and storage.

[0070] In some embodiments, Fig. 9 As shown, the projection screen 1 may further include a functional layer 12 and a plurality of reflective particles 13. The functional layer 12 is stacked on the surface of one side of the substrate layer 11, and a plurality of cavities are formed inside the functional layer 12. The plurality of reflective particles 13 are respectively arranged in the plurality of cavities. In this way, the cavities in the functional layer 12 may provide a location for the plurality of reflective particles 13. Since the functional layer 12 is wrapped around the outside of the reflective particles 13, the functional layer 12 may also provide protection for the reflective particles 13 to prevent the reflective particles 13 from being scratched.

[0071] It is understandable that in actual application, the functional layer 12 can be made of a material with good light transmittance. In this way, in actual application, the light loss of the projection light projected by the projector 2 is reduced when passing through the functional layer 12, which helps to maintain the accuracy of the original projection color, making the displayed image color richer and more realistic.

[0072] like Figure 8 As shown, the reflective particles 13 are used to reflect the projection light so that the projection light is reflected toward the position of the viewer 3. In this way, the projection light projected by the projector 2 can enter the eyes of the viewer 3 after being reflected by the reflective particles 13, so that the viewer 3 can watch the content projected by the projector 2.

[0073] The reflective particles 13 are also used to reflect ambient light, so that the ambient light is reflected toward a position away from the audience. In this way, the reflective particles 13 can reduce the influence of ambient light on the imaging of the projection picture, and can ensure the clarity of the picture viewed by the audience 3.

[0074] By setting the reflective particles 13, the projection screen 1 can reflect the projection light projected by the projector 2 to the position of the audience 3 during use, and can also reflect the ambient light to the position away from the audience. The projection screen 1 as a whole only includes the substrate layer 11, the functional layer 12 and the reflective particles 13 set in the internal cavity of the functional layer 12, and the audience 3 can clearly see the picture projected by the projector 2. The projection screen 1 can have a good anti-light effect without setting a multi-layer structure, and the projection screen 1 has a simple process and low production cost.

[0075] In actual application, the inner wall of the cavity can be tightly wrapped around the outer side of the reflective particle 13. In this way, the cavity can fix the position of the reflective particle 13, and the reflective particle 13 can be stably arranged in the functional layer 12, which can ensure the stability of the reflective particle 13 reflecting light.

[0076] In some embodiments, Fig.10 As shown, Fig.10 The optical path diagram of the reflective particle 13 provided in the embodiment of the present application is that the reflective particle 13 is a hollow structure, so that the projection light and the ambient light are refracted after entering the reflective particle 13 from one side of the reflective particle 13, and are reflected when transmitted to the inner wall on the other side of the reflective particle 13, and are re-emitted from the side where the projection light and the ambient light entered.

[0077] In the actual application process, Figure 8 As shown, since the projector 2 and the audience 3 are located on the same side of the projection screen 1, the projection light can be re-reflected to the incident side after passing through the reflective particles 13, and then enter the eyes of the audience 3, so that the audience 3 can watch the image projected by the projector 2.

[0078] In some embodiments, Fig.10 As shown, the reflective particle 13 can be a hollow spherical structure, and the outer wall of the reflective particle 13 and the inner wall of the reflective particle are spherical surfaces with the same center, so that the incident direction of the projection light and the emission direction after reflection by the reflective particle 13 are parallel, and the incident direction of the ambient light and the emission direction after reflection by the reflective particle 13 are parallel.

[0079] In this way, Figure 8As shown, when the ambient light and the incident light 21 of the projector 2 are incident on the reflective particles 13 from different positions, the reflective particles 13 can reflect the ambient light to a position away from the viewer 3, and the incident light 21 is reflected to the position where the viewer 3 is located. The projection screen 1 can effectively resist the influence of ambient light and ensure the imaging effect of the projection device 100.

[0080] In practical applications, the functional layer 12 may have the same refractive index as the outer shell of the reflective particle 13. Fig.11 As shown, Fig.11 This is a schematic diagram of the light reflection path of the projection screen 1 provided in an embodiment of the present application. In the process of light entering the reflective particles 13 from the functional layer 12, the light will not be refracted because the refractive index of the functional layer 12 can be the same as that of the shell of the reflective particles 13.

[0081] When the light enters the hollow structure inside the reflective particle 13 from the outer shell of the reflective particle 13, the light is refracted at this time because the refractive index of the hollow structure inside the reflective particle 13 is different from that of the outer shell of the reflective particle 13. The refracted light is reflected when it reaches the inner wall on the other side of the reflective particle 13, and the reflected light is emitted from the side where it entered. When the reflected light passes through the outer shell of the reflective particle 13, it is refracted again, and the refracted reflected light is parallel to the direction of the incident light.

[0082] In some embodiments, the particle size of the reflective particles 13 is greater than or equal to 1 μm, and the particle size of the reflective particles 13 is less than or equal to 100 μm. In this way, the reflective particles 13 have a better reflection effect on light, and the projection screen 1 has a good imaging effect.

[0083] In some embodiments, at least a portion of the reflective particles 13 are made of glass material. The reflective particles 13 made of glass have good reflective effect and low cost. Exemplarily, the reflective particles 13 may include borosilicate glass reflective particles.

[0084] In order to improve the reflection effect of the projection screen 1, in some embodiments, as Fig.12 As shown, Fig.12 The second structural diagram of the projection screen 1 provided in the embodiment of the present application, the plurality of cavities include a first cavity and a second cavity, and the plurality of reflective particles 13 are respectively disposed in the plurality of first cavities. In this way, the first cavity can provide a space for the reflective particles 13 to be disposed.

[0085] The projection screen 1 may further include a plurality of metal reflective particles 14, which are respectively disposed in the plurality of second cavities. Since the metal reflective particles 14 are made of metal material, the metal reflective particles 14 have a good light reflection effect, and the metal reflective particles 14 can improve the light reflection effect of the projection screen 1, thereby improving the clarity of the imaging of the projection screen 1.

[0086] In practical applications, the inner wall of the second cavity can be wrapped around the outer side of the metal reflective particles 14. In this way, the second cavity can fix the position of the metal reflective particles 14. When the second cavity is evenly distributed in the functional layer 12, the metal reflective particles 14 are also evenly arranged inside the functional layer 12, thereby ensuring the overall reflection effect of the projection screen 1 on light.

[0087] For example, the metal reflective particles 14 may include aluminum powder, which may have a smooth surface and is an opaque material with good light reflection effect. Alternatively, the metal reflective particles 14 may also include silver powder, which may also have a smooth surface and good light reflection effect.

[0088] The metal reflective particles 14 may also include aluminum powder and silver powder, so that the metal reflective particles 14 also have a good reflection effect on light. It is understandable that the metal reflective particles 14 may also be other metal powders, as long as the metal reflective particles 14 have a good reflection effect on light.

[0089] In some embodiments, Fig.13 As shown, Fig.13 The third structural diagram of the projection screen 1 provided in the embodiment of the present application, the cavity may include a plurality of first cavities and a plurality of third cavities. The projection screen 1 may also include a plurality of diffusion particles 15, the plurality of diffusion particles 15 are respectively arranged in the plurality of third cavities, and the diffusion particles 15 are used to diffuse the projection light passing through the diffusion particles 15 ( Fig.10 ). In this way, projector 2 ( Figure 8 ) The projection light emitted is diffused by the diffusion particles 15 and the reflection range is increased, which can improve the viewing angle of the projection screen 1.

[0090] It should be noted that the diffusion particles 15 may be light-transmitting particles, and the refractive index of the diffusion particles 15 is inconsistent with the refractive index of the functional layer 12. In this way, it can be ensured that the diffusion particles 15 can diffuse the projection light passing through the diffusion particles 15 to more locations, thereby improving the viewing angle of the projection screen 1.

[0091] Exemplarily, the diffusion particles 15 may include one or more of titanium dioxide diffusion particles, silicon dioxide diffusion particles, barium sulfate diffusion particles, stearate diffusion particles, and paraffin diffusion particles.

[0092] It is understandable that in other embodiments, the third cavity may not be provided with diffusion particles 15. In this way, the third cavity may be filled with gas or other medium. When the gas or other medium filled in the third cavity has a different refractive index from the functional layer 12, the projection light will also be refracted after passing through the third cavity, thereby improving the viewing angle of the projection screen 1.

[0093] It is understandable that as the range of the projection light being diffused increases, the clarity of the image formed by the projection screen 1 decreases. Therefore, in order to ensure the image presentation effect of the projection screen 1, in some embodiments, the ratio of the mass of the plurality of reflective particles 13 to the mass of the plurality of diffusion particles is greater than or equal to 20, and the ratio of the mass of the plurality of reflective particles 13 to the mass of the plurality of diffusion particles is less than or equal to 40. In this way, the projection screen 1 has a larger viewing angle while ensuring the image presentation clarity.

[0094] In some embodiments, Fig.14 As shown, Fig.14 The fourth structural diagram of the projection screen 1 provided in the embodiment of the present application, the cavity may further include a plurality of fourth cavities. The projection screen 1 may further include a plurality of pigment particles 16, the plurality of pigment particles 16 are respectively disposed in the plurality of fourth cavities, and the pigment particles 16 are used to absorb the ambient light passing through the pigment particles 16. In this way, the pigment particles 16 can reduce the influence of the ambient light on the imaging of the projection screen.

[0095] In some embodiments, in addition to the reflective particles 13, the projection screen 1 may also include two or three of the metal reflective particles 14, the diffusion particles 15, and the pigment particles 16. In this way, when making the projection screen 1, the staff can add different components according to actual use requirements.

[0096] For example, Fig.15 As shown, Fig.15 In the fifth structural diagram of the projection screen 1 provided in the embodiment of the present application, the cavity may include a plurality of first cavities, a plurality of second cavities and a plurality of fourth cavities. Accordingly, the projection screen 1 may include a plurality of reflective particles 13, a plurality of metal reflective particles 14 and a plurality of pigment particles 16.

[0097] Or, if Fig.16 As shown, Fig.16 The sixth structural diagram of the projection screen 1 provided in the embodiment of the present application, the cavity may include a plurality of first cavities, a plurality of second cavities, a plurality of third cavities and a plurality of fourth cavities. Accordingly, the projection screen 1 may include a plurality of reflective particles 13, a plurality of metal reflective particles 14, a plurality of diffusion particles 15 and a plurality of pigment particles 16.

[0098] It is understandable that the projection screen 1 can be configured with one or more of the metal reflective particles 14, the diffusion particles 15 and the pigment particles 16 as required, and it is only necessary to ensure that the projection screen 1 can transmit the projection light ( Fig.10 ) can be reflected to the audience's location.

[0099] In some embodiments, the functional layer 12 may include a solvent, an acrylic resin, a thickener, and a leveling agent. The solvent may include one or more of water, ethanol, ethyl acetate, acetone, and toluene, the acrylic resin may include a resin polymerized from acrylic acid or methacrylic acid monomers, the thickener may be a sodium polyacrylate thickener, and the leveling agent may be polydimethyl modified siloxane.

[0100] In some embodiments, when reflective particles 13, metal reflective particles 14 and pigment particles 16 are provided in the functional layer 12, the weight proportions of the components constituting the functional layer 12 and the reflective particles 13, metal reflective particles 14 and pigment particles 16 may be 20 to 30 parts of solvent, 50 to 70 parts of acrylic resin, 1 to 2 parts of thickener, 1 to 3 parts of leveling agent, 80 to 90 parts of reflective particles, 10 to 20 parts of metal reflective particles and 10 to 20 parts of pigment particles.

[0101] In other embodiments, when reflective particles 13, metal reflective particles 14, diffusion particles 15 and pigment particles 16 are provided in the functional layer 12, the weight proportions of the components constituting the functional layer 12 and the reflective particles 13, metal reflective particles 14, diffusion particles 15 and pigment particles 16 may be 20 to 30 parts of solvent, 50 to 70 parts of acrylic resin, 1 to 2 parts of thickener, 1 to 3 parts of leveling agent, 50 to 80 parts of reflective particles, 10 to 20 parts of metal reflective particles, 1 to 10 parts of diffusion particles and 10 to 20 parts of pigment particles.

[0102] For example, the weight of each component constituting the functional layer 12 and the reflective particles 13, the metal reflective particles 14, the diffusion particles 15 and the pigment particles 16 can be 20 parts of solvent, 60 parts of acrylic resin, 1 part of thickener, 2 parts of leveling agent, 80 parts of reflective particles, 10 parts of metal reflective particles, 2 parts of diffusion particles, and 10 parts of pigment particles. At this time, the mass ratio of the reflective particles 13 to the diffusion particles 15 is 40.

[0103] Alternatively, the weight ratio of the components constituting the functional layer 12 and the reflective particles 13, the metal reflective particles 14, the diffusion particles 15 and the pigment particles 16 can be 20 parts of solvent, 60 parts of acrylic resin, 1 part of thickener, 2 parts of leveling agent, 80 parts of reflective particles, 10 parts of metal reflective particles, 4 parts of diffusion particles and 10 parts of pigment particles. In this case, the mass ratio of the reflective particles 13 to the diffusion particles 15 is 20.

[0104] It is understandable that the weight proportions of the components constituting the functional layer 12 and the reflective particles 13, the metal reflective particles 14, the diffusion particles 15 and the pigment particles 16 can also be other values, as long as they are within the numerical range of each component and the ratio of the weight proportions of the reflective particles 13 to the diffusion particles 15 is greater than or equal to 20, and the ratio of the weight proportions of the reflective particles 13 to the diffusion particles 15 is less than or equal to 40.

[0105] The embodiment of the present application also provides a method for manufacturing a projection screen 1, comprising the following steps:

[0106] S100, preparing a substrate layer, where the substrate layer can be made of chemical fiber cloth or nylon cloth;

[0107] S200, uniformly stirring the solvent, acrylic resin, thickener, leveling agent, reflective particles, metal reflective particles, diffusion particles and pigment particles prepared in parts by weight to form a coating;

[0108] S300, applying the coating formed in step S200 to the substrate layer by spraying, scraping, silk-screening or roller coating, and drying;

[0109] S400, coating the coating formed in step S200 again on the substrate layer, drying again and performing hot pressing and lamination to obtain a projection screen.

[0110] In the above steps, by applying the coating on the substrate layer twice, it can be ensured that the surface of the substrate layer is evenly coated with the coating. When the coating is applied to the surface of the substrate layer by screen printing or roller coating, the staff can control the number of screen grids or the distance between the roller and the substrate to control the thickness of the surface coating, so as to avoid the situation where the reflective particles 13 are stacked, and ensure that the reflective particles 13 are evenly laid in the same plane.

[0111] In order to verify the projection effect of the projection screen 1 of the present application, the present application conducted experiments on projection screens 1 of different compositions and white plastic screens and gray plastic screens under the same external environment. The experimental results are shown in Table 1:

[0112] Table 1

[0113] Gain Ambient Occlusion Half-gain viewing angle White plastic curtain 0.9 3％ 170° Gray plastic curtain 0.5 50％ 90° Projection screen 1a 1.0 80％ 40° Projection screen 1b 0.9 76％ 45° Projection screen 1c 0.85 74％ 50° Projection screen 1d 0.8 73％ 60° Projection Screen 1e 0.8 70％ 75°

[0114] The functional layer 12 of the projection screen 1a, the projection screen 1b, the projection screen 1c and the projection screen 1d is provided with reflective particles 13, metal reflective particles 14 and pigment particles 16, and the weight proportions of the components of the functional layer 12 and the reflective particles 13, the metal reflective particles 14 and the pigment particles 16 are respectively 20 parts of solvent, 60 parts of acrylic resin, 1 part of thickener, 2 parts of leveling agent, 80 parts of reflective particles, 10 parts of metal reflective particles and 10 parts of pigment particles.

[0115] The reflective particles 13 in the projection screen 1a, the projection screen 1b, the projection screen 1c and the projection screen 1d are all hollow spherical reflective particles, and the diameter of the reflective particles 13 of the projection screen 1a is 5 μm, the diameter of the reflective particles 13 of the projection screen 1b is 20 μm, the diameter of the reflective particles 13 of the projection screen 1c is 40 μm, and the diameter of the reflective particles 13 of the projection screen 1d is 60 μm.

[0116] The functional layer 12 of the projection screen 1e is provided with reflective particles 13, metal reflective particles 14, diffusion particles 15 and pigment particles 16, and the weight parts of the components of the functional layer 12 and the reflective particles 13, metal reflective particles 14, diffusion particles 15 and pigment particles 16 are respectively 20 parts of solvent, 60 parts of acrylic resin, 1 part of thickener, 2 parts of leveling agent, 80 parts of reflective particles, 10 parts of metal reflective particles, 2 parts of diffusion particles and 10 parts of pigment particles. The reflective particles 13 in the projection screen 1e are all hollow spherical reflective particles, and the diameter of the reflective particles 13 in the projection screen 1e is 5 μm.

[0117] During the experiment, the brightness parameters were tested by the luminance meter CS-2000, and the illumination parameters were tested by the illuminance meter CLA-200A.

[0118] The gain is calculated using the following formula:

[0119] G=πL÷E

[0120] Where G is the screen gain, L is the brightness of the projection center, and E is the illumination of the projection center. The ambient light shielding rate is calculated by the following formula:

[0121] β=[1-(πL÷E)]×100%

[0122] Among them, β is the ambient light shielding rate, L is the ambient light brightness, and E is the ambient light illumination.

[0123] The half-gain viewing angle is twice the angle with the center line when the gain is half of the center gain point, which is offset from the center line of the screen.

[0124] It can be seen from the data in the table that when the diameter of the reflective particles 13 gradually increases within the range of 5 μm to 60 μm, the gain value of the projection screen 1 gradually decreases, the ambient light shielding rate gradually decreases, and the half-gain viewing angle increases. In this way, in actual application, the user can select a projection screen 1 provided with reflective particles 13 of different diameters according to actual use requirements.

[0125] When the diameter of the reflective particles 13 is the same, after the projection screen 1 adds the diffusion particles 15, the gain value gradually decreases, the ambient light shielding rate gradually decreases, and the half-gain viewing angle increases. The user can add the diffusion particles 15 to the projection screen 1 according to actual use requirements to increase the half-gain viewing angle.

[0126] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A projection screen, characterized in that: The projection screen comprises: substrate layer; a functional layer, which is stacked on the surface of one side of the substrate layer, and a plurality of cavities are formed inside the functional layer; and A plurality of reflective particles, wherein the plurality of reflective particles are respectively disposed in the plurality of cavities; The reflective particles are used to reflect the projection light and the ambient light, so that the projection light is reflected toward the position where the audience is located, and the ambient light is reflected toward the position away from the position where the audience is located.

2. The projection screen according to claim 1, characterized in that: The reflective particle is a hollow structure, so that the projection light and the ambient light are refracted after entering the reflective particle from one side of the reflective particle, reflected when transmitted to the inner wall on the other side of the reflective particle, and emitted again from the side where the projection light and the ambient light entered.

3. The projection screen according to claim 2, characterized in that: The reflective particles are hollow spherical structures; the outer wall of the reflective particles and the inner wall of the reflective particles are spherical surfaces with the same center, so that the incident directions of the projection light and the ambient light are parallel to the outgoing directions after being reflected by the reflective particles.

4. The projection screen according to claim 2, characterized in that: The particle size of the reflective particles is greater than or equal to 1 μm, and the particle size of the reflective particles is less than or equal to 100 μm.

5. The projection screen according to claim 1, characterized in that: At least a portion of the reflective particles are made of glass material.

6. The projection screen according to claim 1, characterized in that: The plurality of cavities include a plurality of first cavities and a plurality of second cavities; the plurality of reflective particles are respectively disposed in the plurality of first cavities; The projection screen also includes: A plurality of metal reflective particles are respectively disposed in the plurality of the second cavities.

7. The projection screen according to claim 1, characterized in that: The plurality of cavities include a plurality of first cavities and a plurality of third cavities; the plurality of reflective particles are respectively disposed in the plurality of first cavities; The projection screen also includes: A plurality of diffusion particles are disposed in the plurality of third cavities respectively; the diffusion particles are used for diffusing the projection light passing through the diffusion particles.

8. The projection screen according to claim 7, characterized in that: The ratio of the mass of the plurality of reflective particles to the mass of the plurality of diffusion particles is greater than or equal to 20, and the ratio of the mass of the plurality of reflective particles to the mass of the plurality of diffusion particles is less than or equal to 40.

9. The projection screen according to claim 1, characterized in that: The plurality of cavities include a plurality of first cavities and a plurality of fourth cavities; the plurality of reflective particles are respectively disposed in the plurality of first cavities; The projection screen also includes: A plurality of pigment particles are disposed in the plurality of fourth cavities respectively; the pigment particles are used for absorbing the ambient light passing through the pigment particles.

10. A projection device, characterized in that: It comprises a projector and a projection screen as described in any one of claims 1 to 9; the projector is located at one side of the projection screen; the projector is used to emit projection light toward the projection screen, and the projection screen is used to reflect the projection light projected by the projector.

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