CN114137789A - Projection screen and projection device - Google Patents

Abstract

The application discloses projection screen and projection arrangement relates to projection display technical field, can increase projection screen's the visual angle of watching, promotes spectator's watching experience. The projection screen comprises a Fresnel lens layer and a reflecting layer which are arranged in a stacked mode. One side of the Fresnel lens layer, which is close to the reflecting layer, is provided with a Fresnel microstructure. The reflecting layer is provided with a reflecting surface, the reflecting surface is positioned on one side of the reflecting layer close to the Fresnel microstructure, and the reflecting surface is a curved surface. The point on the reflecting surface farthest from the Fresnel microstructure is taken as a reference point, and the reflecting surface gradually approaches to the Fresnel microstructure along the direction that the reference point points to the edge of the reflecting surface. 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, a projection screen with a fresnel microstructure generally includes a surface layer 101, a colored layer 102, a diffusion layer 103, a fresnel lens layer 104, and a reflective 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.

The projection screen with the Fresnel microstructure has the advantages of high gain and certain ambient light resistance. However, the fresnel microstructure may cause light emitted from the projection screen to converge within a certain range, thereby resulting in a smaller viewing angle of the projection screen. When the viewer is facing the projection screen, the brightness of the picture displayed by the projection screen is higher. However, when the viewer is at a position away from the projection screen, the brightness of the picture displayed on the projection screen is greatly reduced, which affects the viewing experience of the viewer.

Disclosure of Invention

The application provides a projection screen and projection arrangement, can increase projection screen's the visual angle of watching, promote spectator's the experience of watching.

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

in one aspect, the present application provides a projection screen, including a fresnel lens layer and a reflective layer that are stacked. One side of the Fresnel lens layer, which is close to the reflecting layer, is provided with a Fresnel microstructure. The reflecting layer is provided with a reflecting surface, the reflecting surface is positioned on one side of the reflecting layer close to the Fresnel microstructure, and the reflecting surface is a curved surface. The point on the reflecting surface farthest from the Fresnel microstructure is taken as a reference point, and the reflecting surface gradually approaches to the Fresnel microstructure along the direction that the reference point points to the edge of the reflecting surface.

According to the projection screen provided by the embodiment of the application, the reflecting surface is a curved surface, the reference point of the reflecting surface points to the edge direction of the reflecting surface, and the reflecting surface is gradually close to the Fresnel microstructure, so that a slightly concave reflecting surface is formed. Therefore, the light rays entering the projection screen reach the reflecting surface after penetrating through the Fresnel lens layer, the reflected light rays can be diffused under the action of the reflecting surface, the coverage range of the diffused light rays is wider, and the viewing angle of the projection screen is enlarged. At the same time, most ambient light is absorbed or scattered by the projection screen to areas outside the human eye. Compared with the prior art, the projection screen provided by the embodiment of the application has the advantages that the reflecting surface is set to be the slightly concave curved surface, the reflecting direction of light can be adjusted to a greater extent, and light can be converged in a larger range. Because the convergence range grow of light for spectator can watch the image of the high brightness that projection screen throws in wider visual angle within range, and projection screen's the visual angle of watching has had promotion by a wide margin, and then promotes spectator's the experience of watching.

In some embodiments, the projection screen further comprises a lenticular lens layer. The convex lens layer is located between Fresnel lens layer and the reflection stratum, and the surface of the convex lens layer far away from one side of Fresnel lens layer is raised towards the direction far away from Fresnel lens layer, and is attached to the reflection surface.

In some embodiments, the refractive index of the lenticular lens layer is less than the refractive index of the fresnel lens layer.

In some embodiments, the projection screen further comprises at least one functional layer. The functional layer is positioned on one side, far away from the reflecting layer, of the Fresnel lens layer, and at least one surface of the two surfaces, close to and far away from the Fresnel lens layer, of the functional layer is an atomizing surface.

In some embodiments, at least one of the two surfaces of the functional layer adjacent to and remote from the fresnel lens layer is coated with diffusing particles to form an atomized surface.

In some embodiments, at least one of the two surfaces of the functional layer adjacent to and remote from the fresnel lens layer is provided with light-transmitting protrusions to form an atomized surface.

In some embodiments, the light transmissive protrusion includes at least one of a moth eye structure and a microlens.

In some embodiments, the projection screen further comprises a diffusing layer and a colored layer, the functional layer being one of the diffusing layer and the colored layer.

In some embodiments, the projection screen further comprises a protective layer. The protective layer is located the reflection stratum and keeps away from fresnel lens layer one side.

In another aspect, the present application provides a projection device comprising a projector and any of the projection screens of the previous aspects. The projector is used for projecting light rays, and the projection screen is used for reflecting the light rays projected by the projector and displaying pictures.

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 diagram illustrating a positional relationship between a projector and a projection screen when the projection apparatus provided in the embodiment of the present application is in use;

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

fig. 4 is a schematic structural diagram of another projection screen provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of a fresnel lens layer in a projection screen provided in an embodiment of the present application;

FIG. 6 is a schematic diagram of an optical path near the center of a Fresnel microstructure;

FIG. 7 is a schematic diagram of the optical path away from the center of the Fresnel microstructure;

FIG. 8 is a schematic view of a structure when the surface of a functional layer is coated with diffusion particles;

fig. 9 is a schematic structural view when the surface of the functional layer is provided with light-transmitting protrusions.

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;

100-a projection device; 1-a projection screen; 11-a fresnel lens layer; 111-fresnel microstructure; 12-a reflective layer; 121-a reflective surface; 13-a lenticular lens layer; 14-a functional layer; 141-light-transmitting bumps; 1411-microlenses; 15-diffusing particles; 16-a diffusion layer; 17-a coloured layer; 18-a substrate layer; 19-a surface layer; 2-a projector; 21-incident light; 22-outgoing rays; 3-audience.

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.

It should be noted that in practical applications, due to the limitation of the precision of the device or the installation error, the absolute parallel or perpendicular effect is difficult to achieve. In the present application, the vertical, parallel or equidirectional description is not an absolute limitation condition, but means that the vertical or parallel structural arrangement can be realized within a preset error range, and a corresponding preset effect is achieved, so that the technical effect of limiting the features can be realized to the maximum extent, and the corresponding technical scheme is convenient to implement and has high feasibility.

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.

At present, projection screens with fresnel microstructures are widely used in ultra-short-focus laser projection. Referring to fig. 1, in the related art, a reflective layer 105 in a projection screen having a fresnel microstructure is directly provided on a surface of a fresnel lens layer 104 on the side having the fresnel microstructure. Among them, the reflective layer 105 may be formed by coating a reflective material on the surface of the fresnel lens layer 104.

Because the reflection layer 105 is directly formed on the surface of the fresnel lens layer 104 on the side having the fresnel microstructure, the reflection layer 105 and the fresnel microstructure of the fresnel lens layer 104 have a great dependence relationship, and according to the characteristics of the fresnel microstructure, the reflection surface formed by the reflection layer 105 formed on the surface is a flat surface. Therefore, the exit angle of the light entering the projection screen mainly depends on the structure of the fresnel lens layer 104 itself, and the effects of converging light and resisting ambient light are mainly achieved through the fresnel microstructure in the fresnel lens layer 104, so that the screen has a high-gain characteristic, and the reflection layer 105 has a small influence on the light reflection angle.

The projection screen with the microstructure has a small viewing angle, and in order to increase the viewing angle, the projection screen is provided with a diffusion layer 103, and light is diffused by diffusion particles 106 arranged in the diffusion layer 103, so that the viewing angle of the projection screen is increased. However, the diffusion layer 103 has a limited viewing angle, and when the viewer is out of alignment with the projection screen, the brightness of the screen displayed on the projection screen is greatly reduced, which affects the viewing experience of the viewer.

Based on the above situation, the embodiment of the application provides a projection device, and the projection device is used for projecting playing pictures, images and the like, and can enlarge the viewing angle of a projection screen and improve the viewing experience of audiences.

Referring to fig. 2, fig. 2 is a schematic diagram illustrating a position relationship between the projection screen 1 and the projector 2 when the projection apparatus 100 provided in the embodiment of the present application is used. The projection apparatus 100 includes a projection screen 1 and a projector 2. The projector 2 is used for projecting light, and the projection screen 1 is used for reflecting the light projected by the projector 2 and displaying pictures. 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 and 4, fig. 3 is a schematic structural diagram of a projection screen provided in an embodiment of the present application, and fig. 4 is a schematic structural diagram of another projection screen provided in an embodiment of the present application. The embodiment of the application provides a projection screen 1, which comprises a fresnel lens layer 11 and a reflecting layer 12 which are arranged in a stacked manner. One side of the fresnel lens layer 11 close to the reflective layer 12 is provided with a fresnel microstructure 111. The reflective layer 12 has a reflective surface 121, the reflective surface 121 is located on one side of the reflective layer 12 close to the fresnel microstructure 111, the reflective surface 121 is a curved surface, a point on the reflective surface 121 farthest from the fresnel microstructure 111 is a reference point, and the reflective surface 121 gradually approaches the fresnel microstructure 111 along a direction in which the reference point points to an edge of the reflective surface 121.

In the projection screen 1 provided in the embodiment of the present application, the reflection surface 121 is a curved surface, and along a direction in which the reference point of the reflection surface 121 points to the edge of the reflection surface 121, the reflection surface 121 gradually approaches the fresnel microstructure 111, that is, a slightly concave reflection surface 121 is formed. Accordingly, the light rays incident into the projection screen 1 pass through the fresnel lens layer 11 and reach the reflection surface 121, and the reflected light rays are diffused by the reflection surface 121, so that the range covered by the diffused light rays is wide, and the viewing angle of the projection screen 1 is increased. At the same time, most of the ambient light is absorbed or scattered by the projection screen 1 to areas outside the human eye. Compared with the prior art, the projection screen 1 provided by the embodiment of the application can adjust the reflection direction of light rays to a greater extent by setting the reflection surface 121 to be a slightly concave curved surface, so that the light rays are converged in a greater range. Because the convergence range grow of light for spectator 3 can watch the image of the high luminance that projection screen 1 throws in wider visual angle within range, and projection screen 1's the visual angle of watching has had promotion by a wide margin, and then promotes spectator 3's the experience of watching.

In some embodiments, referring to fig. 3, projection screen 1 further comprises a lenticular layer 13, lenticular layer 13 being located between fresnel lens layer 11 and reflective layer 12. The surface of the convex lens layer 13 on the side away from the fresnel lens layer 11 is convex in the direction away from the fresnel lens layer 11, and is attached to the reflection surface 121.

The reflective layer 12 is generally a metal layer, and a convex lens layer 13 may be provided on one side of the fresnel lens layer 11 in order to form the concave reflective surface 121. In this way, the reflective layer 12 may be applied to the side of the lenticular layer 13 away from the fresnel lens layer 11, and the portion that is in contact with the surface of the lenticular layer 13 may form the reflective surface 121. Since the surface of the convex lens layer 13 away from the fresnel lens layer 11 is a convex surface, the concave reflecting surface 121 can be formed by the convex surface, so that the reflecting surface 121 is easy and convenient to manufacture. Meanwhile, the shape of the reflecting surface 121 may be adjusted by providing the convex lens layers 13 having different shapes. Here, it can be understood that the size of the lenticular lens layer 13 is the same as the entire size of the projection screen 1.

In other embodiments, the reflective surface 121 of the reflective layer 12 can be formed by a mold. The fabrication process is as follows, first, a mold with a suitable curved surface is selected, and then the reflective material is coated on the curved surface of the mold to form the reflective layer 12. Thus, the reflective layer 12 having the reflective surface 121 formed as a slightly concave curved surface can be formed. Then, an optically clear adhesive is applied to the surface of the fresnel microstructure 111, and the curved surface in the mold with the reflective layer 12 is pressed against the optically clear adhesive. Thus, under the stamping of the mold, the surface of the optically transparent adhesive on the side away from the fresnel microstructure 111 is convex in the direction away from the fresnel microstructure 111, and is bonded to the reflecting surface 121. Finally, the mold is removed and the reflective layer 12 will fall off the mold under the action of the optically clear adhesive. Thereby completing the fabrication of the reflective layer 12. In this embodiment, the optically transparent adhesive is the convex lens layer 13.

Further, it is understood that the metal material contained in the metal layer is a reflective material, and the reflective material may include at least one of aluminum and silver. For example, the reflective material may be aluminum, silver, or a combination of aluminum and silver. Taking the reflective material as metal aluminum as an example, aluminum particles can be selected to make the reflective layer 12. When the reflective layer 12 is manufactured, firstly, the aluminum particles are dissolved in the solvent to form an aluminum powder solution, and then the aluminum powder solution is sprayed on the surface of the convex lens layer 13. Among them, the solvent may be a silane coupling agent. Of course, the reflective material may be provided on the surface of the lenticular lens layer 13 by printing or evaporation. 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 12 is formed, the aluminum particles form a dense reflective surface 121, and when light is irradiated on the reflective surface 121, 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 12 can be made very thin, so that the consumption of the aluminum material can be reduced, and the manufacturing cost can be saved.

Referring to fig. 4 and 5, fig. 5 is a schematic structural diagram of a fresnel lens layer 11 in a projection screen 1 according to an embodiment of the present disclosure. It can be understood that the fresnel microstructure 111 is formed with a plurality of inclined arc-shaped inclined planes, the inclined planes form a concentric circle structure with a gradually increasing radius, and the center of the circle is located near the center of the longer side of the fresnel lens layer 11. The surface of the fresnel lens layer 11 on the side away from the reflective layer 12 is a flat surface.

Referring to fig. 3 and 4, when viewed from a cross section of the fresnel lens layer 11, the concentric circular structure forms a series of saw-tooth grooves, and the grooves form a plurality of inclined planes along the vertical direction, an included angle θ between the inclined planes and a plane perpendicular to the vertical direction gradually increases from top to bottom, and the included angle θ may be 5 ° to 85 °.

The curvature of each point on the reflecting surface 121 in each direction can be adjusted according to the structure of the fresnel lens layer 11 and the refractive index. Referring to fig. 3, the fresnel lens layer 11 may be provided with slopes having different degrees of inclination, and the slopes having different degrees of inclination may cause the refraction directions of the light rays to be different. The shape of the reflecting surface 121 is set according to the structure of the fresnel lens layer 11 and the size of the refractive index, so that the viewing angle of the projection screen 1 can be increased as much as possible after light is reflected by the reflecting surface 121, and the viewing experience of a user is improved.

In addition, the reference point position of the reflecting surface 121 is generally determined by setting the included angle of the inclined surfaces in the fresnel microstructure 111 and the refractive index. The reference point can be set at different positions of the reflecting surface 121 by setting the size of the included angle of the inclined surface in the fresnel microstructure 111 and the refractive index. As shown in fig. 3 and 4, the reference point in the projection screen shown in fig. 3 is located at the center of the reflective surface 121, and the reference point in the projection screen shown in fig. 4 is located at an upper position of the reflective surface 121, that is, a point on the reflective surface 121 corresponding to the thinnest position of the reflective layer 12 in fig. 3 and 4 is the reference point.

After passing through the fresnel lens layer 11, a part of the incident light 21 projected by the projector 2 is emitted to the reference point along a direction perpendicular to the surface of the fresnel lens layer 11 on the side away from the reflective layer 12, the curvature of the reference point is zero, the light is reflected along the original path, the reference point is used as an end point, and the curvature of the point on the light is larger as the distance from the reference point is farther.

In some embodiments, the refractive index of the lenticular lens layer 13 is less than the refractive index of the fresnel lens layer 11. Thus, referring to fig. 6 and 7, fig. 6 is a schematic diagram of an optical path near the center of the fresnel microstructure 111, and fig. 7 is a schematic diagram of an optical path far from the center of the fresnel microstructure 111. When light passes through the boundary between the fresnel lens layer 11 and the lenticular lens layer 13, refraction occurs. Moreover, since the refractive index of the lenticular lens layer 13 is smaller than that of the fresnel lens layer 11, the light passing through the fresnel lens layer 11 is diffused, and the viewing angle of the projection screen 1 is increased. Here, the lenticular lens layer 13 may be made of a flexible material so that the lenticular lens layer 13 is rollable.

In some embodiments, referring to fig. 6 and 7, projection screen 1 further comprises at least one functional layer 14, where functional layer 14 is located on the side of fresnel lens layer 11 away from reflective layer 12. At least one of the two surfaces of the functional layer 14 close to and far from the fresnel lens layer 11 is an atomized surface.

By arranging the functional layer 14 and making at least one of the two surfaces of the functional layer 14 close to and far away from the fresnel lens layer 11 be an atomizing surface, light entering the inside of the projection screen 1 can be scattered when passing through the surface of the functional layer 14, so that the light can be diffused towards different directions, and finally the viewing angle of the projection screen 1 is enlarged. Meanwhile, since the light is scattered, coherence between the light is reduced, so that the severity of speckle occurring on the projection screen 1 can be reduced. Here, both surfaces of the functional layer 14 may be provided as the atomizing surfaces, or only one of the surfaces may be provided as the atomizing surface.

In some embodiments, at least one of the two surfaces of the functional layer 14 adjacent to and remote from the fresnel lens layer 11 is subjected to a sand blasting process to form a rough surface. The rough surface is formed through a sand blasting process, so that the haze value of the surface is improved to form an atomized surface, and the atomization process is simple and convenient.

In some embodiments, referring to fig. 8, fig. 8 is a schematic structural diagram of the functional layer 14 with the diffusion particles 15 on the surface. At least one of two surfaces of the functional layer 14 close to and far from the fresnel lens layer 11 is coated with diffusion particles 15 to form an atomized surface. In this way, the roughness of the surface can also be increased, so that light is scattered when passing through the surface coated with the diffusion particles 15. The material of the diffusion particles 15 may be Polymethyl Methacrylate (PMMA). Fig. 8 shows a scheme in which the surface of the functional layer 14 facing away from the fresnel lens layer 11 is coated with the diffusion particles 15.

In some embodiments, at least one of the two surfaces of the functional layer 14 adjacent to and remote from the fresnel lens layer 11 is provided with light-transmitting protrusions 141 to form an atomized surface. Because the surface is equipped with printing opacity arch 141, makes its surface be uneven surface, when light was through the surface that is equipped with printing opacity arch 141, the probability that light takes place specular reflection at this surface is lower, and more light can see through this surface, and can spread when light passes through printing opacity arch 141 to can increase projection screen 1's the visual angle of watching. At the same time, the coherence between the light rays is made low, which also reduces the severity of the speckle appearing on the projection screen 1.

In some embodiments, the light-transmitting protrusion 141 may include at least one of a moth-eye structure and a microlens. When light passes through above-mentioned two kinds of structures, light all can diffuse, towards different direction scattering for the diffusion degree of light increases, thereby increases projection screen's the viewing angle, weakens the severity of the speckle that appears on projection screen 1 simultaneously.

Referring to fig. 9, fig. 9 is a schematic structural view of the functional layer 14 having the light-transmitting protrusions 141. When the light-transmitting protrusion 141 includes the microlens 1411, the microlens 1411 may be hemispherical in shape. The hemispherical microlens 1411 has a curved surface through which light is diffused, thereby increasing the viewing angle of the projection screen 1 and reducing the severity of speckle appearing on the projection screen 1. Of course, the microlens 1411 may have other shapes, and the shape of the microlens 1411 may be adjusted according to actual requirements. The microlens 1411 may be integrally manufactured with the functional layer 14, and the functional layer 14 having the microlens structure is obtained by performing imprinting using a mold having the microlens structure.

When the light-transmitting protrusion includes the moth-eye structure, since the moth-eye structure has a function of reducing the reflectance, light entering the projection screen can penetrate more through the surface when passing through the surface provided with the moth-eye structure, and the moth-eye structure can also diffuse the light, which can also increase the viewing angle of the projection screen and reduce the severity of speckles appearing on the projection screen 1.

In some embodiments, referring to fig. 3, projection screen 1 may further include a diffuser layer 16 on a side of fresnel lens layer 11 away from reflective layer 12. Diffusion particles 15 are distributed in the diffusion layer 16. The light rays first pass through the diffusion of the diffusion particles 15 inside the projection screen 1 and then pass through the fresnel lens layer 11 and the reflection layer 12.

By providing the diffusion layer 16, the degree of diffusion of light is increased, so that the viewing angle can be increased. Meanwhile, the larger the diffusion degree of the light is, the lower the coherence of the light is, so that the interference degree of the light on the surface of the projection screen 1 can be reduced, and the severity of speckles appearing on the surface of the projection screen 1 is further weakened. Similarly, the material of the diffusion particles 15 may be PMMA.

The diffusion layer 16 may be made of a flexible material, for example, the diffusion layer 16 may be made of a Polyethylene terephthalate (PET) material. The PET material is flexible, thereby allowing the diffusion layer 16 to be flexible and capable of being rolled. Of course, the diffuser layer 16 may be made of other flexible materials, such as Thermoplastic polyurethane elastomers (TPU) which is elastic and can be crimped. Alternatively, the diffusion layer 16 may also be made of Styrene Block Copolymers (SBC) flexible materials. The diffusion layer 16 provided in the embodiment of the present application is made of PET material.

Based on the projection screen 1 shown in fig. 3, the diffusion layer 16 may serve as a substrate for making the fresnel lens layer 11. The fresnel lens layer 11 may be cured by UV glue, which makes the fresnel lens layer 11 rollable because the UV glue has elasticity. When preparation fresnel lens layer 11, with UV glue coating on diffusion layer 16's surface, then carry out the impression to fresnel lens layer 11 with special mould for fresnel lens layer 11 shaping, then reuse UV light source lamp solidifies UV glue, and the preparation of fresnel lens layer 11 can be accomplished in the drawing of patterns at last. Of course, in other embodiments, the fresnel lens layer 11 may be made of heat-curable glue.

In some embodiments, with continued reference to fig. 3, the projection screen 1 may further include a colored layer 17, and a dark dye is distributed in the colored layer 17 to absorb the ambient light from the outside, thereby increasing the contrast ratio of the projection screen 1. Generally, the coloured layer 17 may be an optically clear adhesive. The dark color dye is generally an organic dye, and azo dyes, phthalocyanine dyes and the like can be selected.

It will be appreciated that the coloured layer 17 may be located in a different position, as shown in figure 3, and that the coloured layer 17 may be located on the side of the diffusing layer 16 remote from the fresnel lens layer 11. Of course, the colored layer 17 may be located on the side of the diffusion layer 16 closer to the fresnel lens layer 11, and may be selected according to the actual situation.

In some embodiments, the functional layer 14 (shown in fig. 5) may be one of a diffusion layer and a colored layer. As shown in fig. 3, when the diffusion layer 16 and the colored layer 17 are provided, the surfaces of the diffusion layer 16 and the colored layer 17 may be made into a fogging surface to diffuse light so as to increase the viewing angle and reduce the severity of speckle of the projection screen 1, that is, the diffusion layer 16 and the colored layer 17 are two functional layers 14. By using the diffusion layer 16 and the colored layer 17 as the functional layer 14, the functional layer 14 does not need to be additionally provided, so that the structure of the projection screen 1 is simple. Of course, a separate functional layer 14 may be additionally provided to diffuse light.

In some embodiments, referring to fig. 3, projection screen 1 may further include a substrate layer 18 on a side of fresnel lens layer 11 away from reflective layer 12. The substrate layer 18 can be used as a support base for the projection screen 1, the number of the substrate layers 18 can be multiple, and a plurality of substrate layers 18 are arranged to be used as a support base together. The embodiment shown in fig. 3 is provided with only one base material layer 18 and is located on the side of the coloring layer 17 away from the diffusion layer 16. Likewise, the substrate layer 18 may be made of a PET material, which is flexible, thereby making the substrate layer 18 flexible and capable of being rolled. In addition, the light transmittance of the PET material can reach more than 90%, the light transmission can be ensured as far as possible, the light loss is reduced, and the thickness range of the base material layer 18 can be 0.1 mm-0.3 mm.

In some embodiments, referring to fig. 3, the projection screen 1 further includes a surface layer 19, and the surface layer 19 is located on the side of the substrate layer 18 away from the colored layer 17, that is, the surface layer 19 is located on the outermost layer, and is used for protecting the projection screen 1 and preventing the projection screen 1 from being damaged.

In some embodiments, in order to reduce the proportion of light that is specularly reflected at the surface of the surface layer 19 on the side away from the substrate layer 18, the surface may be provided as a frosted surface, thereby reducing the proportion of light that is specularly reflected and preventing the light from forming a clear image elsewhere (ceiling) and affecting the viewing experience of the viewer. The surface of the surface layer 19 on the side away from the substrate layer 18 may have a haze value in the range of 12% to 20%, and for example, the haze value may be set to 12%, 15%, 18%, or 20%. When the haze value is within the above range, the probability of specular reflection of light is low.

Next, the process of producing the surface layer 19 will be briefly described by taking the projection screen 1 shown in fig. 3 as an example. The substrate layer 18 may serve as a base for making the surface layer 19. The surface layer 19 may also be made of UV glue curing. When the surface layer 19 is manufactured, the UV glue is coated on the surface, far away from the coloring layer 17, of the base material layer 18, and then the UV glue is cured by using a UV light source lamp, so that the surface layer 19 can be manufactured. Likewise, the surface layer 19 may also be made of a thermosetting glue which is cured by heating. Therefore, the whole layer structure of the projection screen provided by the embodiment of the application can be curled, so that the whole projection screen 1 can be curled and can be curled for use. Therefore, the projection screen 1 can be curled up in the transportation and storage processes, so that the space is saved, and the carrying is convenient.

In some embodiments, the projection screen may further include a protective layer (not shown) on a side of the reflective layer 12 away from the fresnel lens layer 11. Since the metal material (such as aluminum powder) of the reflective layer 12 is easy to fall off during use, the reflective effect of the reflective layer 12 is affected. By providing the protective layer, the reflective layer 12 can be protected, and the risk of falling off of the reflective layer 12 is reduced.

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 Fresnel lens layer and a reflecting layer which are arranged in a laminated manner; a Fresnel microstructure is arranged on one side, close to the reflecting layer, of the Fresnel lens layer; the reflecting layer is provided with a reflecting surface, the reflecting surface is positioned on one side of the reflecting layer close to the Fresnel microstructure, and the reflecting surface is a curved surface; the point on the reflecting surface, which is farthest from the Fresnel microstructure, is a reference point, and the reflecting surface gradually approaches the Fresnel microstructure along the direction that the reference point points to the edge of the reflecting surface.

2. The projection screen of claim 1, further comprising a lenticular lens layer; the convex lens layer is located between the Fresnel lens layer and the reflecting layer, and the surface of one side, far away from the Fresnel lens layer, of the convex lens layer protrudes towards the direction far away from the Fresnel lens layer and is attached to the reflecting surface.

3. The projection screen of claim 2 wherein the refractive index of the lenticular lens layer is less than the refractive index of the fresnel lens layer.

4. A projection screen according to claim 1 further comprising at least one functional layer on a side of the fresnel lens layer remote from the reflective layer; at least one of two surfaces of the functional layer close to and far from the Fresnel lens layer is an atomizing surface.

5. The projection screen of claim 4 wherein at least one of the two surfaces of the functional layer adjacent to and remote from the Fresnel lens layer is coated with diffusing particles to form the fogging surface.

6. The projection screen of claim 4 wherein at least one of the two surfaces of the functional layer adjacent to and remote from the Fresnel lens layer is provided with light-transmissive protrusions to form the fogging surface.

7. The projection screen of claim 6 wherein the light-transmissive protrusions comprise at least one of moth-eye structures and microlenses.

8. The projection screen of any of claims 4-7 further comprising a diffuser layer and a color layer; the functional layer is one of the diffusion layer and the colored layer.

9. The projection screen of claim 1 further comprising a protective layer on a side of the reflective layer away from the fresnel lens layer.

10. A projection device comprising a projector and a projection screen according to any one of claims 1 to 9; the projector is used for projecting light rays, and the projection screen is used for reflecting the light rays projected by the projector and displaying pictures.

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