CN114265280A - Projection screen and projection device - Google Patents

Abstract

The application discloses projection screen and projection arrangement relates to projection display technical field, can make the difficult dust that adsorbs of projection screen, keeps the cleanness on projection screen surface. The projection screen comprises a surface layer, a Fresnel lens layer and a reflecting layer which are arranged in a laminated mode. The surface of the surface layer on the side far away from the Fresnel lens layer is provided with a plurality of nanometer-scale convex parts and a plurality of nanometer-scale concave parts. The projection screen is used for displaying images projected by the projector.

Description

Projection screen and projection device

Technical Field

The application relates to the technical field of projection display, in particular to a projection screen and a projection device.

Background

In the field of projection display technology, especially in the field of ultrashort-focus laser projection display, in order to achieve better brightness and display effect, a projector is generally used in combination with a projection screen having a fresnel microstructure.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a projection screen with a fresnel microstructure in the prior art. A projection screen having a fresnel microstructure generally includes a surface layer 101, a colored layer 102, a diffusion layer 103, a fresnel lens layer 104, and a reflection layer 105, which are stacked. The surface layer 101 serves to protect the projection screen. The colored layer 102 is used to improve the contrast of the projection screen. Diffusion particles 106 are distributed in the diffusion layer 103, and the diffusion particles 106 are used for diffusing light rays entering the projection screen in different directions. The reflective layer 105 is used to reflect light entering the projection screen so that the light is re-emitted from the surface layer 101. When the light projected by the projector 107 reaches the surface layer 101 of the projection screen, the light is refracted at the surface layer 101, enters the projection screen, and finally exits from the surface layer 101 to the viewer 108, so that the viewer 108 can view an image on the projection screen.

However, the surface of the surface layer 101 of the conventional projection screen on the side away from the colored layer 102 is generally an untreated smooth surface, and the surface energy thereof is high. It is known that a surface with a higher surface energy generally reduces its surface energy automatically, and surface adsorption is the main way to reduce the surface energy. Therefore, the surface can adsorb surrounding dust to reduce the surface energy of the projection screen, and the adsorbed dust can pollute the surface of the projection screen, so that the projection effect of the projection screen is influenced, and inconvenience is brought to daily use of the projection screen.

Disclosure of Invention

The application provides a projection screen and projection arrangement can make the difficult dust that adsorbs of projection screen, keeps the cleanness on projection screen surface.

In order to achieve the purpose, the technical scheme is as follows:

in one aspect, an embodiment of the present application provides a projection screen, which includes a surface layer, a fresnel lens layer, and a reflective layer, which are stacked. The surface of the surface layer on the side far away from the Fresnel lens layer is provided with a plurality of nanometer-scale convex parts and a plurality of nanometer-scale concave parts.

According to the projection screen provided by the embodiment of the application, the surface of the surface layer, which is far away from the Fresnel lens layer, is provided with the plurality of nanoscale convex parts and the plurality of nanoscale concave parts, so that the surface forms a rugged concave-convex surface. Thus, air particles fill the recesses on the surface, causing the surface to form a thin protective film of air. The formed air protection film can ensure that external pollutants such as water, oil, dust and the like can only be in some contact with the top end of the protruding part and can not be in full contact with the surface, so that the surface is not easy to adsorb the pollutants. Compared with the prior art, the projection screen provided by the embodiment of the application has the advantages that the surface of the surface layer far away from one side of the Fresnel lens layer is provided with the plurality of nanoscale convex parts and the plurality of nanoscale concave parts, so that the surface can form the air protection film, the surface of the projection screen is not easy to adsorb pollutants, and the self cleanness is kept.

In some embodiments, the plurality of protrusions and the plurality of recesses are uniformly distributed on the surface of the surface layer on the side away from the fresnel lens layer.

In some embodiments, the protrusions and the recesses are alternately distributed on a surface of the surface layer on a side away from the fresnel lens layer along the first direction.

In some embodiments, the protrusions and the recesses are alternately distributed on the surface of the surface layer on the side away from the fresnel lens layer along the second direction. Wherein the second direction is perpendicular to the first direction.

In some embodiments, the protrusions and depressions are continuously distributed on the surface of the surface layer on the side away from the fresnel lens layer.

In some embodiments, the shape of the protrusion and the recess are the same.

In some embodiments, the height of the protrusions and the depth of the recesses are both 100nm to 1000 nm.

In some embodiments, the surface of the surface layer on the side away from the fresnel lens layer is a rough surface, and the protrusions and the recesses are disposed on the rough surface.

In some embodiments, the surface of the surface layer on the side away from the fresnel lens layer is provided with micron-scale raised structures to form a rough surface.

In another aspect, embodiments of the present application provide a projection apparatus, which includes a projector and any one of the projection screens in the above aspects.

Because the projection device provided by the application comprises any one of the projection screens, the same technical problems as the projection screens can be solved, the same technical effects can be achieved, and the details are not repeated here.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of a projection screen with Fresnel microstructure in the prior art;

fig. 2 is a schematic view illustrating a usage state of a projection apparatus according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a projection screen according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a structure of the projection screen shown in FIG. 3 when air particles are filled in a recess;

FIG. 5 is a schematic cross-sectional view of a portion of the projection screen of FIG. 3 in another direction;

FIG. 6 is a schematic structural diagram of a surface layer provided in an embodiment of the present disclosure, in which protrusions and depressions are spaced apart from each other;

FIG. 7 is a schematic structural diagram of a surface layer having protrusions and depressions of another shape according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a surface layer having protrusions and depressions with different shapes according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of another projection screen provided in an embodiment of the present application;

fig. 10 is a schematic structural diagram of another projection screen provided in an embodiment of the present application;

fig. 11 is a schematic structural diagram of a reflective layer according to an embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of another reflective layer provided in this embodiment of the present application.

Reference numerals:

101-a surface layer; 102-a coloured layer; 103-a diffusion layer; 104-a fresnel lens layer; 105-a reflective layer; 106-diffusion particles; 107-projector; 108-a viewer;

100-a projection device; 1-a projection screen; 11-a surface layer; 111-a boss; 112-a recess; 12-a fresnel lens layer; 13-a reflective layer; 14-a diffusion layer; 15-diffusing particles; 16-a coloured layer; 17-a substrate layer; 2-a projector; 21-incident light; 22-outgoing rays; 3-a viewer; 4-air particles.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms, "upper", "lower", "front", "inner", "center", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in 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 in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

In the embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

The embodiment of the application provides a projection device, which is used for projecting and playing pictures, images and the like. Referring to fig. 2, fig. 2 is a schematic view illustrating a usage state of the projection apparatus 100 according to the embodiment of the present disclosure. The projection apparatus 100 includes a projection screen 1 and a projector 2. In use of the projection apparatus 100, the projector 2 may be placed in front of and below the projection screen 1, and the viewer 3 may be positioned in front of the projection screen 1 and look at the projection screen 1. Incident light 21 emitted by the projector 2 is irradiated to the projection screen 1, and the incident light 21 is reflected by the projection screen 1 to finally form emergent light 22 to be irradiated to the audience 3, and simultaneously, images are formed in the projection screen 1.

The projector 2 includes a laser, which may be one of a monochromatic laser, a dichroic laser, and a three-color laser. The three-color laser can emit blue laser, red laser and green laser. The wavelength of blue laser light emitted from the three-color laser may be set to a range of 430nm to 460nm, the wavelength of green laser light emitted may be set to a range of 500nm to 540nm, and the wavelength of red laser light emitted may be set to a range of 610nm to 650 nm.

Since the three-color laser has the advantages of color fidelity and high color gamut, the laser in the projector 2 provided by the embodiment of the present application can be selected from the three-color laser. Of course, the laser in the projector 2 provided in the embodiment of the present application may also be a monochromatic laser or a dichroic laser.

Next, the projection screen 1 in the projection apparatus 100 will be further described.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a projection screen 1 according to an embodiment of the present disclosure. The projection screen 1 includes a laminated surface layer 11, a fresnel lens layer 12, and a reflection layer 13. The surface of the surface layer 11 on the side away from the fresnel lens layer 12 is provided with a plurality of nano-scale protrusions 111 and a plurality of nano-scale recesses 112.

In the projection screen 1 provided in the embodiment of the present application, the surface of the surface layer 11 on the side away from the fresnel lens layer 12 has a plurality of nano-scale protrusions 111 and a plurality of nano-scale recesses 112, so that the surface forms a rugged concave-convex surface. Thus, referring to fig. 4, fig. 4 is a schematic structural diagram of the projection screen 1 shown in fig. 3 when the recess 112 is filled with the air particles 4, and the air particles 4 are filled in the recess 112 on the surface, so that a thin air protection film is formed on the surface. The formed air protecting film can make external water, oil, dust and other pollutants only contact with the top end of the protruding part 111 to some extent, and can not contact with the surface sufficiently, so that the surface is not easy to adsorb the pollutants. Compared with the prior art, according to the projection screen 1 provided by the embodiment of the application, since the surface of the surface layer 11 on the side far away from the fresnel lens layer 12 is provided with the plurality of nano-scale protrusions 111 and the plurality of nano-scale recesses 112, the surface can form an air protection film, so that the surface of the projection screen 1 is not easy to adsorb pollutants, and the self-cleaning is kept.

It can be understood that after the light projected by the projector 2 passes through the fresnel lens layer 12 and the reflective layer 13 in the projection screen 1, the light converges toward the center of the projection screen 1, so that the viewer 3 facing the center of the projection screen 1 can see an image with higher brightness, and has better gain. Meanwhile, the ambient light is reflected to the non-human-eye viewing area by the fresnel lens layer 12, so that the ambient light is prevented from affecting the viewing effect of the viewer 3.

In addition, the convex portions 111 and the concave portions 112 increase the roughness of the surface layer 11 on the side away from the fresnel lens layer 12, so that the reflectivity of light on the surface can be reduced, the utilization rate of the light is improved, a certain light diffusion effect can be achieved, and the viewing angle of the projection screen 1 is enlarged.

In some embodiments, referring to fig. 4, the plurality of protrusions 111 and the plurality of recesses 112 may be uniformly distributed on the surface of the surface layer 11 on the side away from the fresnel lens layer 12. Because a plurality of bellying 111 and a plurality of depressed part 112 evenly distributed are on this surface for this surface forms more even air protection film more easily, and then makes this on the surface all positions all be difficult to adsorb the dust, keeps the holistic cleanness of projection screen 1. The arrangement of the convex portions 111 and the concave portions 112 on the surface can be different, as long as the convex portions 111 or the concave portions 112 are arranged at each position on the surface, and the surface is uniformly distributed.

In some embodiments, referring to fig. 3 and 5, fig. 5 is a schematic cross-sectional view of a portion of the projection screen shown in fig. 3 in another direction. The convex portions 111 and the concave portions 112 may be continuously distributed on the surface of the surface layer 11 on the side away from the fresnel lens layer 12. Through distributing bellying 111 and depressed part 112 in succession for bellying 111 and depressed part 112 distribute more densely, and this surface is unevenness more, can fill more air particles, thereby forms the air protection film of compactness, and external pollutant is difficult to contact projection screen 1's surface more, thereby improves projection screen 1 surperficial dustproof effect.

Of course, in other embodiments, referring to fig. 6, fig. 6 is a schematic structural diagram of the surface layer 11 according to the present application when the protrusions 111 and the depressions 112 are spaced apart. The convex portions 111 and the concave portions 112 may be provided at intervals on the surface of the surface layer 11 on the side away from the fresnel lens layer 12.

In some embodiments, referring to fig. 3, along the first direction X, the plurality of protrusions 111 and the plurality of recesses 112 are alternately distributed on the surface of the surface layer 11 on the side away from the fresnel lens layer 12. Since the convex portions 111 and the concave portions 112 are alternately distributed on the surface of one side of the surface layer fresnel lens layer 1 along the first direction X, that is, one concave portion 112 is disposed between two convex portions 111. Like this, have a great recess between per two adjacent bellying 111, the packing effect of air particle is guaranteed in the air particle of holding that can be better, and air particle can be more stable adsorb on this surface to guarantee that projection screen 1's surface has better dustproof effect, keep surperficial cleanness.

It will be appreciated that the projection screen 1 is generally rectangular, and as shown in fig. 3, the first direction X may be the width direction of the projection screen 1. That is, along the width direction of surface layer 11, a plurality of convex portions 111 and a plurality of concave portions 112 are alternately distributed on the surface of surface layer 11 on the side away from fresnel lens layer 12. Of course, in other embodiments, the protrusions 111 and the depressions 112 may be arranged in other ways, for example, two depressions 112 may be arranged between two adjacent protrusions 111 along the width direction of the surface layer 11. Or the convex portions 111 and the concave portions 112 may be arranged on the surface of the surface layer 11 on the side far from the fresnel lens layer 12 in other manners, which is not further limited.

In some embodiments, referring to fig. 5, along the second direction Y, the plurality of protrusions 111 and the plurality of recesses 112 may also be alternately arranged on the surface of the surface layer 11 on the side away from the fresnel lens layer 12. The second direction Y is perpendicular to the first direction X. Through all arranging bellying 111 and depressed part 112 in turn in first direction X and second direction Y for the surface layer 11 is kept away from the surface of fresnel lens layer 12 one side and has the law more, thereby promotes the stability that air particle kept away from fresnel lens layer 12 one side on the surface at surface layer 11, guarantees that this surface can form a air film that stably exists, thereby makes external pollutant be difficult to contact this surface, guarantees the cleanness on this surface. Similarly, the second direction Y may be a length direction of the projection screen 1, that is, a length direction of the surface layer 11, and the plurality of convex portions 111 and the plurality of concave portions 112 are alternately distributed on a surface of the surface layer 11 on a side away from the fresnel lens layer 12.

In some embodiments, referring to fig. 3, 4, and 5, the shape of the protrusion 111 and the recess 112 may be the same. By arranging the convex parts 111 and the concave parts 112 in the same shape, the uneven surface formed by the surface layer is more regular, air particles can be filled uniformly, the formed air film can be more compact, and pollutants can be better blocked.

In some embodiments, the shape of the protrusions 111 and the depressions 112 may include one of a cylindrical shape, a conical shape, an ellipsoidal shape, a parabolic shape, and an irregular shape. The convex part 111 and the concave part 112 with different shapes can achieve better dustproof effect. The shapes of the convex portion 111 and the concave portion 112 are described above as examples, and the convex portion 111 and the concave portion 112 may have other shapes. Here, exemplarily, as shown in fig. 5, the shapes of the convex portion 111 and the concave portion 112 are both semi-ellipsoidal, or as shown in fig. 7, the shapes of the convex portion 111 and the concave portion 112 are both conical.

In addition, the shapes of the convex portion 111 and the concave portion 112 may be different. Referring to fig. 8, fig. 8 is a schematic structural diagram of a surface layer 11 provided with protrusions and depressions of different shapes according to an embodiment of the present application. The convex portion 111 shown in fig. 8 has a conical shape, and the concave portion 112 has a semi-ellipsoidal shape.

In some embodiments, the height of the protrusions 111 and the depth of the recesses 112 are both 100nm to 1000 nm. When the height of the convex portion 111 and the depth of the concave portion 112 are within the above range, air particles can be stably filled on the surface of the surface layer 11 on the side away from the fresnel lens layer 12, and a stable air protection film can be formed. Therefore, the air protection film can better isolate external pollutants from the surface layer 11 of the projection screen 1, and the pollutants cannot directly contact the surface layer 11 of the projection screen 1, so that the surface of the projection screen 1 can be kept clean. Illustratively, the height of the protrusions 111 and the depth of the depressions 112 may each be 100nm, 500nm, or 1000 nm.

In some embodiments, the surface of the surface layer 11 on the side away from the fresnel lens layer 12 may be a rough surface on which the convex portions 111 and the concave portions 112 are disposed. Therefore, the surface is a rough surface, so that the probability of light rays reflected by the projector on the surface can be reduced, the probability of the light rays forming clear images in other places (such as a ceiling) is reduced, and the viewing experience of audiences is improved. Meanwhile, the convex parts 111 and the concave parts 112 are formed on the rough surface, so that the formed air film is tighter, the external air is less prone to contact with the surface, and the dustproof effect of the surface is better.

In some embodiments, the surface of the surface layer 11 on the side away from the fresnel lens layer 12 is provided with micro-scale protruding structures (not shown) to form a rough surface. Thus, the surface has microstructures of two different sizes. The micro-scale protrusion structure is used to form a rough surface, and the nano-scale protrusion 111 and the depression 112 are formed on the micro-scale protrusion structure to form an air film to prevent external contaminants from being adsorbed on the surface. Of course, the rough surface may also be formed by a sand blasting process.

When the surface layer 11 is formed, the micro-scale raised structures on the surface layer 11 are formed, and then the nano-scale raised portions 111 and the nano-scale recessed portions 112 are formed on the surface layer. The shape and size of the micron-sized protruding structure can be selected according to actual conditions, and are not further limited.

The projection screen 1 provided in the embodiment of the present application has a plurality of nano-scale protrusions 111 and recesses 112 on the surface of the surface layer 11 away from the fresnel lens layer 12 to prevent contaminants such as moisture, oil, and dust from being adsorbed. In this way, when moisture contacts the surface, a small amount of dust possibly existing on the surface of the projection screen 1 can be carried away, and a certain self-cleaning effect is achieved.

In some embodiments, referring to fig. 3, projection screen 1 further includes a diffuser layer 14 positioned between surface layer 11 and fresnel lens layer 12, with diffusing particles 15 distributed within diffuser layer 14. Light entering the projection screen 1 passes through the diffusion layer 14 first and is diffused in all directions by the diffusion particles 15. The viewing angle of the projection screen 1 is increased due to the diffusion of the light. Meanwhile, the coherence of the diffused light rays is weak, so that the interference degree of the light rays on the surface of the projection screen 1 is reduced, and the severity of speckles appearing on the surface of the projection screen 1 is further weakened. The material of the diffusion particles 15 may be Polymethyl Methacrylate (PMMA).

The diffusion layer 14 may be made of a flexible material, for example, the diffusion layer 14 may be made of a Polyethylene terephthalate (PET) material. The PET material is flexible, thereby allowing the diffusion layer 14 to be flexible and capable of being rolled. Of course, the diffuser layer 14 may be made of other flexible materials, such as Thermoplastic polyurethane elastomers (TPU) which is elastic and can be crimped. Alternatively, the diffusion layer 14 may also be made of Styrene Block Copolymers (SBC) flexible materials. The diffusion layer 14 provided by the embodiment of the present application is made of PET material.

Based on the projection screen 1 shown in fig. 3, the diffusion layer 14 may serve as a substrate for making the fresnel lens layer 12. The fresnel lens layer 12 may be formed by curing UV (ultra violet Rays) adhesive, which makes the fresnel lens layer 12 rollable because the UV adhesive has elasticity. When preparation fresnel lens layer 12, glue the coating with the UV on the surface of diffusion layer 14, then carry out the impression to fresnel lens layer 12 with special mould for fresnel lens layer 12 shaping, then reuse UV light source lamp solidifies UV glue, and the preparation of fresnel lens layer 12 can be accomplished in the drawing of patterns at last. Of course, in other embodiments, the Fresnel lens layer 12 may be made of a heat curable glue.

In some embodiments, with continued reference to fig. 3, the projection screen 1 may further include a colored layer 16, the colored layer 16 may be located between the surface layer 11 and the diffusion layer 14, and a dark dye is distributed in the colored layer 16, and the dark dye may absorb ambient light from the outside, thereby increasing the contrast of the projection screen 1. The dark color dye is generally an organic dye, and azo dyes, phthalocyanine dyes and the like can be selected. The colored layer 16 may be made of a methyl methacrylate-styrene copolymer (MS) material or a PET material, wherein the colored layer 16 is made of a PET material, so that the colored layer 16 has flexibility and can be curled.

In some embodiments, referring to fig. 9 and fig. 10, fig. 9 is a schematic structural diagram of another projection screen provided in the embodiments of the present application, and fig. 10 is a schematic structural diagram of another projection screen provided in the embodiments of the present application. The projection screen may further include a substrate layer 17, the substrate layer being located between the surface layer 11 and the fresnel lens layer 12, and the substrate layer 17 may serve as a support base for the projection screen.

The number of the substrate layers 17 may be selected in various ways. As shown in fig. 9, the projection screen 1 is provided with a substrate layer 17, and the substrate layer 17 is located between the surface layer 11 and the fresnel lens layer 12 and can be used as a base for manufacturing the surface layer 11 and the fresnel lens layer 12.

Of course, the projection screen 1 may be provided with a plurality of substrate layers 17, and as shown in fig. 10, the projection screen 1 may be provided with two substrate layers 17, one of the substrate layers being located between the surface layer 11 and the colored layer 16, and the other substrate layer 17 being located between the diffusion layer 14 and the fresnel lens layer 12. One substrate layer 17 near the surface layer 11 may be used as a base for manufacturing the surface layer 11, and one substrate layer 17 near the fresnel lens layer 12 may be used as a base for manufacturing the fresnel lens layer 12.

The material of the substrate layer 17 may be made of a flexible material. For example, the base material layer 17 may be made of a PET material. The PET has flexibility so that the base material layer 17 has flexibility, thereby achieving curling of the projection screen 1. Of course, the substrate layer 17 may also be made of other flexible materials, for example, the substrate layer may also be made of TPU material or SBC material, both of which can make the substrate layer 17 flexible and rollable.

Alternatively, the substrate layer 17 may be made of MS material, polyurethane, polyvinyl chloride, polypropylene or polyethylene material. Wherein, the hardness of the MS material is high, and the flatness is better. The polyurethane has good adhesion and can be better combined with other structures in the projection screen. The polyvinyl chloride has the advantages of good size stability, good weather resistance and low cost, and the hardness can be adjusted by using a plasticizer. The polypropylene has the advantages of easy dyeing, light weight, good toughness, high temperature resistance, good chemical resistance and the like. Polyethylene has the advantages of excellent low-temperature resistance and good chemical stability, and can resist corrosion of most of acid and alkali.

In some embodiments, referring to fig. 9, a dark dye is added within the reflective layer 13. Through adding dark colour dyestuff in reflector layer 13, can absorb external environment light to increase projection screen's contrast, projection screen 1 also need not to set up solitary dyed layer, and then reduces projection screen 1's whole thickness.

It should be noted that the convex portion 111 and the concave portion 112 can be manufactured by different methods. For example, the fabrication is performed using a sol-gel process, a physical vapor deposition process, and a chemical vapor deposition process. As another example, fabrication is performed using masking, etching, and bio-replication processes. Among them, masking techniques include photolithography, nanoimprint, and self-assembly techniques. The etching technology comprises dry etching and wet etching, and the dry etching comprises reactive ion etching, ion beam etching and inductively coupled plasma etching. The method of fabrication is selected in detail, and may be selected according to the material of the surface layer 11 and the fabrication conditions.

For example, the projection screen shown in fig. 9 is taken as an example, and the fabrication of the surface layer 11 will be briefly described. The surface layer 11 may be made of UV glue curing. In the case that the surface layer 11 is made of a UV-glue material, the nano-imprint technique may be selected to make the protrusions 111 and the recesses 112. The manufacturing process includes firstly, manufacturing a mold with structures corresponding to the convex portions 111 and the concave portions 112, then, using the mold to imprint the UV glue, obtaining the UV glue with the convex portions 111 and the concave portions 112 after demolding, and then, curing the UV glue by using a UV light source lamp to obtain the surface layer 11 with the convex portions 111 and the concave portions 112. Specifically, a proper mold can be selected according to different requirements for manufacturing.

In some embodiments, referring to fig. 11 and 12, fig. 11 is a schematic structural diagram of a reflective layer 13 provided in an embodiment of the present application, and fig. 12 is a schematic structural diagram of another reflective layer 13 provided in an embodiment of the present application. The reflective layer 13 may be coated on the surface of the fresnel lens layer 12. Specifically, after the fresnel lens layer 12 is manufactured, the reflective layer 13 is coated on the surface of the fresnel lens layer 12. The reflective material of the reflective layer 13 may be aluminum. Of course, in other embodiments, the reflective material in the reflective layer 13 may also be silver, or a combination of silver and aluminum.

Taking the example of selecting aluminum as the reflective material, referring to fig. 11, in order to increase the gain of the projection screen 1, powdered aluminum powder may be selected and coated on the fresnel lens layer 12 by spray printing or vapor deposition. Therefore, because the powdered aluminum powder is finer and more delicate and has insignificant directivity, most of the light emitted by the projector can be reflected out of the projection screen directionally according to the arrangement of the microstructure of the fresnel lens layer 12, and the light cannot be reflected around randomly, so that the gain of the projection screen is higher.

When aluminum particles are selected as the reflective material, the diameter of the aluminum particles may range from 5um to 20 um. The aluminum particles within this range have a small diameter, and after the reflective layer 13 is formed, the aluminum particles form a dense reflective surface, and when light is irradiated on the reflective surface, the light can be reflected as much as possible, thereby avoiding waste of light energy. Meanwhile, when the aluminum particles are selected as the reflective material, the reflective layer 13 can be made very thin, so that the consumption of the aluminum material can be reduced, and the manufacturing cost can be saved.

Of course, referring to fig. 12, when the reflective material of the reflective layer 13 is aluminum, scaly aluminum powder may be selected. The scale-shaped aluminum powder is sprayed on the fresnel lens layer 12 by means of spray printing. The scaly aluminum powder has larger diameter-thickness ratio, so the bonding capability of aluminum is stronger and the aluminum is not easy to fall off. Wherein the diameter-thickness ratio of the scale-like aluminum powder can range from (40:1) to (100: 1).

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A projection screen is characterized by comprising a surface layer, a Fresnel lens layer and a reflecting layer which are arranged in a laminated manner; the surface of the surface layer, which is far away from the Fresnel lens layer, is provided with a plurality of nano-scale convex parts and a plurality of nano-scale concave parts.

2. The projection screen of claim 1, wherein the plurality of protrusions and the plurality of depressions are uniformly distributed on a surface of the surface layer on a side away from the fresnel lens layer.

3. The projection screen of claim 2 wherein, in the first direction, the raised portions and the recessed portions are alternately distributed on a surface of the surface layer on a side away from the fresnel lens layer.

4. The projection screen of claim 3, wherein along the second direction, the protrusions and the depressions are alternately distributed on a surface of the surface layer on a side away from the Fresnel lens layer; wherein the second direction is perpendicular to the first direction.

5. The projection screen of claim 2, wherein the protrusions and depressions are continuously distributed on a surface of the surface layer on a side away from the fresnel lens layer.

6. The projection screen of any one of claims 1-5 wherein the protrusions and the depressions are the same shape.

7. The projection screen of claim 6 wherein the height of the protrusions and the depth of the depressions are each 100nm to 1000 nm.

8. The projection screen of claim 1, wherein the surface of the surface layer on the side away from the fresnel lens layer is a rough surface, and the protrusions and the recesses are disposed on the rough surface.

9. The projection screen of claim 8, wherein the surface of the surface layer on the side away from the fresnel lens layer is provided with micro-scale raised structures to form the rough surface.

10. A projection apparatus comprising a projector and a projection screen according to any one of claims 1 to 9.

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