阅读说明：本技术 一种投影屏幕及投影装置 (Projection screen and projection device ) 是由 张海鹏 于 2021-09-27 设计创作，主要内容包括：本申请公开了一种投影屏幕及投影装置,涉及投影显示技术领域,用于解决现有技术中的投影屏幕抗环境光能力较差的问题。投影屏幕包括层叠设置的表面层、偏光片层、菲涅尔透镜层以及反射层。偏光片层被配置为透过预设偏振方向的线偏振光。该投影屏幕用于显示投影机投射的影像。(The application discloses projection screen and projection arrangement relates to projection display technical field for solve the relatively poor problem of projection screen anti ambient light ability among the prior art. The projection screen comprises a surface layer, a polarizer layer, a Fresnel lens layer and a reflecting layer which are arranged in a stacked mode. The polarizer layer is configured to transmit linearly polarized light of a preset polarization direction. The projection screen is used for displaying images projected by the projector.)

1. A projection screen is characterized by comprising a surface layer, a polarizer layer, a Fresnel lens layer and a reflecting layer which are arranged in a stacking mode; the polarizer layer is configured to transmit linearly polarized light of a preset polarization direction.

2. The projection screen of claim 1 further comprising a diffuser layer between the surface layer and the fresnel lens layer.

3. The projection screen of claim 2, wherein the projection screen further comprises a substrate layer; the polarizer layer is located between the diffusion layer and the surface layer, and the substrate layer is located between the diffusion layer and the Fresnel lens layer.

4. The projection screen of claim 2 wherein a dark dye is added within the diffusion layer.

5. The projection screen of claim 1 wherein diffusing particles are distributed within the reflective layer.

6. The projection screen of claim 5 further comprising a substrate layer and an adhesive layer, the substrate layer being between the polarizer layer and the Fresnel lens layer, the adhesive layer being between the substrate layer and the polarizer layer.

7. The projection screen of claim 1 wherein the surface of the surface layer on the side away from the polarizer layer is a matte surface.

8. The projection screen of claim 1 wherein a dark dye is added within the reflective layer.

9. The projection screen of claim 1 wherein the polarizer layer is an iodine-based polarizer layer.

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

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 having a fresnel microstructure generally includes a surface layer 101, a first base material layer 102, a colored diffusion layer 103, a second base material layer 104, a fresnel lens layer 105, and a reflection layer 106, which are laminated. The surface layer 101 serves to protect the projection screen. Diffusion particles 107 are distributed in the colored diffusion layer 103, and the diffusion particles 107 are used for diffusing light rays entering the projection screen along different directions. Meanwhile, a dark dye is added in the coloring diffusion layer 103 to improve the contrast of the projection screen. The first base material layer 102 and the second base material layer 104 serve as a support base for the projection screen, and the first base material layer 102 may serve as a base for producing the surface layer 101 and the colored diffusion layer 103, and the second base material layer 104 may serve as a base for producing the colored diffusion layer 103 and the fresnel lens layer 105. The reflective layer 106 is coated on the surface of the fresnel lens layer 105 on the side away from the second substrate layer 104, and light entering the projection screen is reflected when reaching the reflective layer 106, and the light is reflected and then exits from the surface layer 101.

However, the projection screen has poor capability of resisting ambient light interference, and the projection screen is easily affected by the ambient light, so that the projection effect of the projection screen is poor.

Disclosure of Invention

The application provides a projection screen and a projection device for solve the problem that the anti ambient light ability of the projection screen among the prior art is relatively poor.

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

in a first aspect, the present application provides a projection screen, including a surface layer, a polarizer layer, a fresnel lens layer, and a reflective layer, which are stacked. The polarizer layer is configured to transmit linearly polarized light of a preset polarization direction.

The application provides a projection screen, including the polarizer layer, the polarizer layer is configured to see through the linear polarization of predetermineeing the polarization direction. Because the polarisation lamella only can let the light of predetermineeing the polarization direction see through, the light of other polarization directions can't see through the polarisation lamella, consequently, only partial light can see through the polarisation lamella in the ambient light to make projection screen reduce the reflection of ambient light, promote the ability of projection screen anti ambient light. Meanwhile, because the light that the projector sent itself just is the linear polarization light, so the polarizer layer does not have the influence to the light that the projector sent, and light can normally pass through the polarizer layer, can not cause harmful effects to the original optical property of projection screen. Through setting up the polarizer layer, rely on the attribute of polarizer layer itself to reduce projection screen to the reflection of ambient light, very big promotion projection screen's anti ambient light ability. Compared with the prior art, the projection screen provided by the application has the advantages that the polarizer layer is arranged, so that the environment light resistance of the projection screen is improved, and the projection effect of the projection screen is better.

Further, the projection screen further comprises a diffusion layer, and the diffusion layer is located between the surface layer and the Fresnel lens layer.

Further, the projection screen further comprises a substrate layer, the polarizer layer is located between the diffusion layer and the surface layer, and the substrate layer is located between the diffusion layer and the Fresnel lens layer.

Furthermore, a dark dye is added into the diffusion layer.

Furthermore, diffusion particles are distributed in the reflecting layer.

Further, projection screen still includes substrate layer and adhesive linkage, and the substrate layer is located between polarizer layer and the fresnel lens layer, and the adhesive linkage is located between substrate layer and the polarizer layer.

Further, the surface of the surface layer on the side away from the polarizer layer is an atomized surface.

Furthermore, dark dyes are added in the reflecting layer.

Further, the polarizer layer is an iodine-based polarizer layer.

In a second aspect, the present application provides a projection apparatus, including a projector and any one of the projection screens in the first aspect, so that the same technical problems as those of the projection screens described above can be solved, and the same technical effects can be achieved, which are not described herein again.

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 polarizer layer 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 another projection screen provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of another projection screen provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of another projection screen provided in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a surface layer provided in an embodiment of the present disclosure;

fig. 9 is a schematic perspective view illustrating a structure of a surface layer provided with light-transmitting protrusions according to an embodiment of the present disclosure;

FIG. 10 is a schematic view of the path of light through the surface layer of FIG. 9;

FIG. 11 is a schematic structural diagram of another surface layer provided in an embodiment of the present application;

FIG. 12 is a schematic structural diagram of yet another surface layer provided in an embodiment of the present disclosure;

fig. 13 is a schematic structural diagram of a reflective layer according to an embodiment of the present disclosure;

fig. 14 is a schematic structural diagram of another reflective layer provided in an embodiment of the present application.

Reference numerals:

101-a surface layer; 102-a first substrate layer; 103-a color diffusion layer; 104-a second substrate layer; 105-a fresnel lens layer; 106-a reflective layer; 107-diffusion particles;

100-a projection device; 1-a projection screen; 11-a surface layer; 111-light transmissive protrusions; 12-a polarizer layer; 121-a protective film layer; 122-a layer of cellulose triacetate; 123-polyvinyl alcohol layer; 124-a pressure sensitive adhesive layer; 125-a release film layer; 13-a fresnel lens layer; 14-a reflective layer; 15-diffusing particles; 16-a diffusion layer; 17-a substrate layer; 18-an adhesive layer; 2-a projector; 21-incident light; 22-outgoing rays; 3-a viewer; 4-ambient light source.

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", "rear", "left", "right", "inner", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element 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.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

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.

Referring to fig. 2, an embodiment of the present application provides a projection apparatus 100, which includes a projection screen 1 and a projector 2. When the projection apparatus 100 is in use, the projector 2 may be placed in front of and below the projection screen 1, and the viewer 3 is positioned in front of the projection screen 1 and looks 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 finally reflected by the projection screen 1 to form emergent light 22 to be irradiated to the audience 3, and simultaneously, images are formed in the projection screen 1. Light from the ambient light source 4 is reflected by the projection screen 1 to a location where the non-audience members 3 are looking. Wherein the ambient light source 4 may be a luminaire.

It should be noted that the projector 2 includes a laser, which may be one of a monochromatic laser, a dichroic laser, or a three-color laser. In general, the wavelength range of blue laser light emitted from the laser may be set to 430nm to 460nm, the wavelength range of green laser light emitted may be set to 500nm to 540nm, and the wavelength range of red laser light emitted may be set to 610nm to 650 nm.

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

Referring to fig. 2, an embodiment of the present application provides a projection screen 1, which includes a surface layer 11, a polarizer layer 12, a fresnel lens layer 13, and a reflective layer 14, which are stacked. The polarizer layer 12 is configured to transmit linearly polarized light of a preset polarization direction.

The projection screen 1 provided by the embodiment of the application comprises a polarizer layer 12, wherein the polarizer layer 12 is configured to transmit linearly polarized light in a preset polarization direction. Because polarizer layer 12 only can let the light of predetermineeing the polarization direction to see through, the light of other polarization directions can't see through polarizer layer 12, consequently, only partial light can see through polarizer layer 12 in the ambient light that ambient light source 4 sent to make projection screen 1 reduce the reflection of ambient light, promote the ability of projection screen 1 anti ambient light. Meanwhile, because the light emitted by the projector 2 is linearly polarized light, the polarizer layer 12 has no influence on the light emitted by the projector 2, and the light can normally pass through the polarizer layer 12, so that the original optical performance of the projection screen 1 cannot be adversely affected. Through setting up polarizer layer 12, rely on the attribute of polarizer layer 12 itself to reduce projection screen 1 to the reflection of ambient light, very big promotion projection screen 1's anti ambient light ability. Compare prior art, the projection screen 1 that this application embodiment provided is through setting up polarizer layer 12 for projection screen 1's anti ambient light's ability improves, and then makes projection screen 1's projection effect better.

It can be understood that the predetermined polarization direction is the same as the polarization direction of the laser emitted from the projector 2, so as to ensure that the laser emitted from the laser can smoothly pass through the polarizer layer 12.

The polarizer layer 12 used in the present embodiment may be an iodine polarizer layer. The iodine-based polarizer layer easily has optical characteristics of high transmittance and high degree of polarization, i.e., relatively strong optical filtering ability. It will be appreciated that the length and width of polarizer layer 12 are consistent with the dimensions of the other layers in projection screen 1.

Illustratively, referring to fig. 3, the polarizer layer 12 includes a protective film layer 121, a Tri-cellulose Acetate (TAC) layer 122, a polyvinyl alcohol (PVA) layer 123, a TAC layer 122, a Pressure Sensitive Adhesive (PSA) layer 124, and a release film layer 125, which are stacked. Among them, the PVA layer 123 plays a role of polarization. Iodine ions are attached to PVA molecular chains and oriented along the stretching direction by performing operations such as dyeing, stretching and curing on the PVA transparent base film, so that the PVA transparent base film has polarization properties.

Since PVA is very easily hydrolyzed, one TAC layer 122 is disposed on each side of the PVA layer 123. The TAC layer 122 has the advantages of high light transmittance and good water resistance. Two TAC layers 122 and one PVA layer 123 constitute a polarizer original plate.

In addition, according to different use requirements, a PSA layer 124 is disposed on one side of one TAC layer 122 away from the PVA layer 123, a release film layer 125 is disposed on one side of the PSA layer 124 away from the TAC layer 122, and the release film layer 125 plays a role in protecting the PSA layer 124. A protective film layer 121 is provided on the other TAC layer 122 on the side remote from the PVA layer 123.

In some embodiments, referring to fig. 2, diffusion particles 15 are distributed within the reflective layer 14. The diffusing particles 15 serve to diffuse light entering the projection screen 1. When light enters the reflective layer 14, the light is diffused in all directions by the diffusion particles 15, so as to enlarge the viewing angle of the projection screen 1. The material of the diffusion particles 15 may be Polymethyl methacrylate (PMMA).

In addition, since the diffusion particles 15 are distributed in the reflective layer 14, a separate diffusion layer is not additionally provided. Thus, the viewing angle of the projection screen 1 is increased, and the thickness of the projection screen 1 is ensured not to be too thick. In this case, the polarizer layer 12 may also serve as a substrate for manufacturing the fresnel lens layer 13.

In some embodiments, referring to FIG. 4, the surface of surface layer 11 on the side away from polarizer layer 12 is a matte surface. Since the incident light 21 emitted from the projector 2 is specularly reflected at the surface of the surface layer 11 away from the polarizer layer 12, the specularly reflected light forms an image elsewhere (e.g. on the ceiling), which affects the viewing experience of the viewer 3. By setting the surface of the surface layer 11 on the side away from the polarizer layer 12 as the atomizing surface, the proportion of the light rays specularly reflected by the surface can be reduced, and the viewing experience of the audience 3 is improved.

Wherein, the haze value of the surface layer 11 on the side far away from the polarizer layer 12 may be 12% to 20%. For example, the haze value may be set at 12%, 15%, 18%, or 20%. When the haze value of the surface layer 11 on the side away from the polarizer layer 12 is within this range, the probability that the incident light 21 strikes the surface of the surface layer 11 on the side away from the polarizer layer 12 and is specularly reflected is low.

Setting the haze value of the surface layer 11 on the side away from the polarizer layer 12 in the range of 12% to 20% can be achieved by at least the following two ways: 1. performing AG treatment (i.e., anti-glare treatment) on the surface of the surface layer 11 on the side away from the polarizer layer 12; 2. a pattern-biting path is impressed by a mold on the surface of the surface layer 11 on the side away from the polarizer layer 12.

Of course, in some embodiments, providing a haze value of greater than 20% at the surface of surface layer 11 away from polarizer layer 12 may also reduce the proportion of light that is specularly reflected at the surface of surface layer 11 away from polarizer layer 12.

Next, a process of manufacturing the surface layer 11 and the fresnel lens layer 13 will be described by way of example with reference to the projection screen 1 shown in fig. 2.

The fresnel lens layer 13 may be made of a flexible material. For example, the fresnel lens layer 13 may be made of an ultra violet ray (UV) adhesive, which is also called a photosensitive adhesive or an Ultraviolet light curing adhesive. When preparation fresnel lens layer 13, glue the coating with the UV and leave on the surface of superficial layer 11 one side at polarizer layer 12, then carry out the impression to fresnel lens layer 13 with special mould for fresnel lens layer 13 shaping, reuse UV light source lamp solidifies UV glues, then the preparation of fresnel lens layer 13 can be accomplished in the drawing of patterns. Of course, in other embodiments, the fresnel lens layer 13 may be made of heat-curable glue.

The surface layer 11 may also be made of a flexible material. The surface layer 11 may also be made of UV glue, for example. When the surface layer 11 is manufactured, the UV glue is coated on the surface of the polarizer layer 12 far away from the fresnel lens layer 13, and then the UV glue is cured by using a UV light source lamp, so that the surface layer 11 can be manufactured. Of course, in other embodiments, the surface layer 11 may be made of heat-curable glue.

In some embodiments, referring to fig. 5, projection screen 1 further comprises a diffuser layer 16, diffuser layer 16 being located between surface layer 11 and fresnel lens layer 13. It is understood that the diffusion layer 16 has diffusion particles 15 distributed therein, and when light passes through the diffusion layer 16, the light is diffused by the diffusion particles 15 and is scattered in different directions. Likewise, the material of the diffusion particles 15 may also be chosen from PMMA.

By separately arranging the diffusion layer 16, the optical path of the light in the projection screen 1 can be increased, and the diffusion degree of the light can be increased after the light is diffused by the diffusion particles 15, so that speckles appearing on the projection screen 1 can be weakened.

Illustratively, referring to FIG. 5, polarizer layer 12 is positioned between surface layer 11 and diffuser layer 16. In this case, the polarizer layer 12 may serve as a substrate for the diffusion layer 16. Of course, the polarizer layer 12 may be located between the diffusion layer 16 and the fresnel lens layer 13.

In some embodiments, when polarizer layer 12 is positioned between diffuser layer 16 and surface layer 11, with reference to fig. 6, projection screen 1 may further include a substrate layer 17, with substrate layer 17 positioned between diffuser layer 16 and fresnel lens layer 13. On the one hand, the substrate layer 17 can regard as projection screen 1's support basis, and on the other hand, the setting of substrate layer 17 for light further increases at the inside optical path of this projection screen 1, makes the diffusion degree of light further increase, thereby makes the degree of the speckle that appears on projection screen 1 alleviate.

In general, the thickness of the polarizer layer 12 is smaller than that of the substrate layer 17, and the thickness of the polarizer layer 12 is smaller. Therefore, compared to the two-layer substrate layer used in the projection screen in the related art, the polarizer layer 12 and the substrate layer 17 are used as a support base for the projection screen 1, and the thickness thereof is relatively small. Of course, the substrate layer 17 may be a polarizer layer 12, that is, the projection screen 1 has two polarizer layers 12, and the thickness can be further reduced. Of course, the polarization directions of the light transmitted by the two polarizer layers 12 are kept consistent so as not to affect the optical performance of the projection screen 1.

For example, the thickness of the polarizer layer 12 is 0.13 to 0.25mm, and the thickness of the substrate layer 17 is generally about 0.25 mm. As can be seen, the thickness of the entire projection screen 1 is thinner in the case where the single-layer base material layer 17 is provided, compared to the conventional art. Whereas in the embodiment shown in fig. 2, only the polarizer layer 12 is provided, the thickness of the projection screen 1 is about 0.3mm to 0.4mm, which can be reduced by about 0.4mm compared to the prior art.

Wherein, the substrate layer 17 may be made of a flexible material. For example, the substrate layer 17 may be made of Polyethylene terephthalate (PET). Of course, in other embodiments, the substrate layer 17 may be made of other flexible materials, for example, the substrate layer 17 may be made of Thermoplastic polyurethane elastomer (TPU) material. Alternatively, the substrate layer 17 may be made of Styrene Block Copolymers (SBC) flexible material.

The substrate layer 17 may be made of a methyl methacrylate-styrene copolymer (MS). The MS material has high hardness and good smoothness.

In some embodiments, referring to fig. 5 and 6, a dark dye may be added within the diffusion layer 16. By adding a dark dye within the diffusion layer 16, the contrast of the projection screen 1 can be further improved. In addition, the dark dye is added in the diffusion layer 16, so that the projection screen 1 does not need to be separately provided with a coloring layer, the number of layers and the thickness of the projection screen 1 can be reduced, and the structure of the projection screen 1 can be simplified. The dark color dye is generally an organic dye, and azo dyes, phthalocyanine dyes and the like can be selected.

In some embodiments, referring to fig. 7, based on the diffusion particles 15 distributed in the reflective layer 14, the projection screen 1 may further include a substrate layer 17 and an adhesive layer 18, the substrate layer 17 being located between the polarizer layer 12 and the fresnel lens layer 13, and the adhesive layer 18 being located between the polarizer layer 12 and the substrate layer 17.

The substrate layer 17 can be as projection screen 1's basis, simultaneously, sets up the substrate layer 17 and can increase the optical path of light in projection screen 1, promotes the diffusion degree of light. Through setting up adhesive linkage 18 bonding polarizer layer 12 and substrate layer 17 for the connection between polarizer layer 12 and the substrate layer 17 is easier, and projection screen 1's manufacture process is simpler.

Wherein the adhesive layer 18 may be a UV glue layer, and the two are adhered together by UV glue. Meanwhile, dark dye can be added into the UV adhesive layer to improve the contrast of the projection screen 1.

In some embodiments, to further enhance the contrast of projection screen 1, dark dyes may be added within reflective layer 14. Therefore, when the ambient light passes through the reflective layer 14, the ambient light is absorbed by the dark dye, so that the ambient light resistance of the projection screen 1 can be improved, and the contrast of the projection screen 1 can be improved. The dark color dye is generally an organic dye, and azo dyes, phthalocyanine dyes and the like can be selected. Of course, dark dyes may be added at other locations, for example, the surface layer 11 or the substrate layer 17. Typically, the dark dye is chosen to be added at a location in the projection screen 1 to prevent problems that the dark dye affects the brightness of the projection screen too much.

It is understood that, since the projection screen 1 provided by the embodiment of the present application includes the polarizer layer 12, the polarizer layer 12 can reduce the reflection of the projection screen 1 to the ambient light, and therefore, the dark dye may not be added to the projection screen. Of course, the addition of dark dyes can further improve the contrast of the projection screen 1.

Referring to fig. 8 and 9, in some embodiments, the surface of the surface layer 11 on the side away from the polarizer layer (i.e., the left side of fig. 8 and 9) is provided with a plurality of light-transmissive protrusions 111. As an example, the light-transmitting protrusions 111 provided on the surface layer 11 have a linear semi-cylindrical structure, that is, a cross section of the light-transmitting protrusions 111 taken perpendicular to a longitudinal extending direction thereof has a semi-circular shape. The light-transmitting protrusions 111 on the surface layer 11 may be press-molded by a mold when the surface layer 11 is manufactured.

In order to simplify the shape of the die, thereby facilitating the manufacture of the die and reducing the manufacturing cost of the die. The sizes of the semicircular cross sections of the light-transmitting protrusions 111 at the positions in the length extending direction are the same, and the shapes and the sizes of the light-transmitting protrusions 111 on the surface layer 11 are the same.

Illustratively, the light-transmitting protrusions 111 shown in fig. 9 extend in the width direction of the surface layer 11, and are uniformly arranged in the length direction of the surface layer 11. The light-transmitting protrusions 111 on the surface layer 11 are continuously arranged along the length direction of the surface layer 11, that is, adjacent light-transmitting protrusions 111 are connected in sequence.

Referring to fig. 10, the dotted lines and arrows in fig. 10 indicate the paths of light rays incident into the air after passing through the surface layer 11. In the process of emitting light, the light passes through the light-transmitting protrusions 111 and enters the air, so that refraction occurs. For example, when the surface layer 11 is made of UV glue, since the refractive index of the UV glue is inevitably larger than that of air, light is diffused and the light tends to be diffused in the longitudinal direction of the surface layer 11, the viewing angle of the projection screen 1 in the longitudinal direction of the projection screen 1 can be improved by the light-transmitting protrusions 111.

In other embodiments, the length of the light-transmitting protrusions 111 may also extend along other directions, and correspondingly, light may be diffused along another set direction after passing through each light-transmitting protrusion 111 in the exiting process, so as to improve the viewing angle of the rollable projection screen 1 in the set direction.

The light-transmitting protrusion 111 has a semi-cylindrical structure, and the shape of the light-transmitting protrusion 111 is not limited to be half of a certain cylindrical structure. In some cases, the area of the cross section of the light-transmitting protrusion 111 taken by a plane perpendicular to the lengthwise extension direction thereof may also be larger than the area of the corresponding semicircle or smaller than the area of the corresponding semicircle. In addition, it is understood that the light-transmitting protrusion 111 may also be a protrusion with other shapes, such as a columnar structure, which can also achieve the light diffusion.

Referring to fig. 11, in some embodiments, in order to reduce the probability of specular reflection occurring on the surface of the surface layer 11 on the side away from the polarizer layer, the haze value of the surface of the light-transmitting protrusions 111 is set to be in a range of 12% to 20% on the basis of the light-transmitting protrusions 111 provided on the surface layer 11. For example, the haze value may be set at 12%, 15%, 18%, or 20%. When the haze value of the surface of the light-transmitting projection 111 is within this range, the probability of specular reflection occurring on the surface of the reflection surface 11 on the side away from the polarizer layer can be reduced.

Referring to fig. 12, in some embodiments, diffusing particles 15 may be further distributed in a side of the surface layer 11 away from the polarizer layer 12, and light entering the surface layer 11 is diffused in all directions by the diffusing effect of the diffusing particles 15, so as to increase the viewing angle of the projection screen. The material of the diffusion particles 15 may be PMMA.

In some embodiments, referring to fig. 13 and 14, the fresnel lens layer 13 is provided with a reflective surface 131 on a side close to the reflective surface 14, and the reflective layer 14 may be coated directly on the reflective surface 131 of the fresnel lens layer 13. For example, the reflective layer 14 may be coated on each reflective surface 131 after the fresnel lens layer 13 is manufactured. Wherein, the reflective material of the reflective layer 14 may be aluminum; of course, in other embodiments, the reflective material in the reflective layer 14 can also be silver, or a combination of silver and aluminum. The reflective layer 14 is typically formed by dissolving the reflective material in a solvent and then spraying the solution onto the reflective surface 131.

Taking the example of aluminum as the reflective material, referring to fig. 13, powdered aluminum may be selected to increase the gain of the projection screen 1, and may be coated on the reflective surface 131 by spray printing or vapor deposition. In this way, since the powdered aluminum powder is finer and has less obvious directivity, most of the light emitted by the projector 2 can be reflected out of the rollable projection screen 1 in a directional manner according to the arrangement of the reflection surface 131 of the fresnel lens layer 13, and the light is not reflected around, so that the rollable projection screen 1 has higher gain. In addition, when powdered aluminum powder is used as the reflective material, the thickness of the reflective layer 14 can be made thin. The thinner the reflective layer 14 is made, the smaller the overall thickness of the projection screen. Meanwhile, the less the consumption of the reflecting material aluminum is, the less the cost can be saved.

Of course, referring to fig. 14, when the reflective material of the reflective layer 14 is aluminum, it is also possible to select a scale-like aluminum powder. The scale-shaped aluminum powder can be sprayed on the reflecting surface 131 by means of spray printing. Since the radius-thickness ratio of the scaly aluminum powder is large, the aluminum has a strong bonding ability and is not easily detached when sprayed on the reflecting surface 131. 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.