CN113238451B

CN113238451B - Curlable projection screen and projection system

Info

Publication number: CN113238451B
Application number: CN202110567723.XA
Authority: CN
Inventors: 侯蕊; 王超; 肖伟
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2023-08-15
Anticipated expiration: 2041-05-24
Also published as: CN113238451A

Abstract

The application discloses a rollable projection screen and a projection system, relates to the technical field of projection screens, and is used for solving the problem that the projection screen in the prior art cannot be curled. The rollable projection screen comprises a flexible surface layer, a flexible substrate layer, a Fresnel lens layer and a reflecting layer which are sequentially arranged in a laminated mode. The flexible substrate layer is provided with a plurality of layers, and the thickness of the front flexible substrate layer is smaller than that of the rear flexible substrate layer in the curling direction of the curled projection screen. The rollable projection screen can be rolled up, and is very convenient to transport, install and use.

Description

Curlable projection screen and projection system

Technical Field

The present application relates to the field of projection screens, and more particularly, to a rollable projection screen and projection system.

Background

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

Referring to fig. 1, fig. 1 is a schematic view of a prior art projection screen. The projection screen includes a surface layer 101, a coloring layer 102, a diffusion layer 103, a fresnel lens layer 104, and a reflection layer 105, which are sequentially stacked. The surface layer 101 serves to protect the projection screen. The colored layer 102 includes a colored base layer and a dark dye disposed in the colored base layer for improving the contrast of the projection screen. The diffusion layer 103 comprises a diffusion substrate layer and diffusion particles 106 provided in the diffusion substrate layer, the diffusion particles 106 may be PMMA (Polymethyl Methacrylate ), and the diffusion layer 103 is used for diffusing light rays entering the projection screen in different directions. The side of the fresnel lens layer 104 remote from the diffusion layer 103 is provided with a reflective surface 107, and the reflective layer 105 is coated on the reflective surface 107, and the reflective layer 105 is typically a very thin metal layer coated on the fresnel lens layer 104.

In the existing projection screen, the materials of the coloring basal layer and the diffusion basal layer are mostly MS (methyl methacrylate-styrene copolymer ), and the hardness of MS is large, so that the projection screen cannot be curled, and the projection screen which cannot be curled has large limitation in the transportation and use processes.

Disclosure of Invention

The application aims to provide a rollable projection screen and a projection system, which are used for solving the problem that the projection screen in the prior art cannot be curled.

In order to achieve the above purpose, the application adopts the following technical scheme:

in a first aspect, some embodiments of the present application provide a rollable projection screen including a flexible surface layer, a flexible substrate layer, a fresnel lens layer, and a reflective layer in a stacked arrangement. The flexible substrate layer is provided with a plurality of layers, and the thickness of the front flexible substrate layer is smaller than that of the rear flexible substrate layer in the curling direction of the curled projection screen.

In the rollable projection screen, the flexible substrate layer can be used as a supporting base of the whole rollable projection screen, and the flexible substrate layer is made of flexible materials and has flexibility; the flexible surface layer and the Fresnel lens layer are generally made of flexible materials such as UV glue and have flexibility; the reflecting layer is a very thin metal layer coated on the Fresnel lens layer, so that the Fresnel lens layer can be bent, and the whole Fresnel lens layer and the reflecting layer still have flexibility after the bendable reflecting layer is coated on the Fresnel lens layer; therefore, the whole curled projection screen has flexibility, can be curled, and is convenient to transport, install and use. In addition, the flexible substrate layer is provided with a plurality of layers, and the thickness of the front flexible substrate layer is smaller than that of the rear flexible substrate layer in the curling direction of the curled projection screen, so that the front flexible substrate layer is not easy to damage in the curling process of the curled projection screen in the curling direction of the curled projection screen, and the curled projection screen is easier to curl.

In a possible implementation manner of the first aspect, the thickness difference between two adjacent flexible substrate layers ranges from 30 μm to 50 μm. The thickness of the adjacent two flexible substrate layers is set in such a way that the rollable projection screen is easier to roll.

In one possible implementation of the first aspect, the flexible substrate layer is a PU flexible substrate layer or a TPU flexible substrate layer. PU (Polyurethane) has flexibility, can be curled arbitrarily without deformation, has the advantages of wear resistance, high temperature resistance, high toughness, oil resistance, strong mechanical property and the like, and can realize the curling without deformation of the curled projection screen by using the PU to manufacture the flexible substrate layer. The TPU (Thermoplastic polyurethanes, thermoplastic polyurethane elastomer rubber) has elasticity, and can be curled, and the flexible substrate layer made of the TPU can be curled without deformation of the curled projection screen.

In one possible implementation of the first aspect, the thickness of the flexible substrate layer ranges from 75 μm to 300 μm.

In a possible implementation of the first aspect, a surface of the flexible surface layer remote from the fresnel lens layer is coated with diffusing particles. In this way, the haze value of the surface of the flexible surface layer away from the fresnel lens layer can be increased, so that light rays can be prevented from being specularly reflected on the surface of the flexible surface layer away from the fresnel lens layer, and imaging on the ceiling can be avoided.

In a possible implementation manner of the first aspect, the haze value of the surface of the flexible surface layer away from the fresnel lens layer ranges from 12% to 20%. By this arrangement, light can be prevented from being specularly reflected on the surface of the flexible surface layer remote from the fresnel lens layer, avoiding imaging on the ceiling.

In a possible implementation manner of the first aspect, the surface of the flexible surface layer, which is remote from the fresnel lens layer, is provided with a plurality of light-transmitting protrusions, and the surface of the light-transmitting protrusions has a tapering portion and/or a diverging portion in a direction away from the fresnel lens layer. By the arrangement, when light enters the curled projection screen to be reflected, the reflected light cannot be concentrated on the ceiling, and clear images are prevented from being formed on the ceiling. In addition, when light is emitted from the rollable projection screen, the light can be emitted into the air through the surface of the light-transmitting bulge, and the refractive index of the light-transmitting bulge is necessarily larger than that of the air, so that the light can be diffused when entering the air through the surface of the light-transmitting bulge. Specifically, if the tapered portion and/or the diverging portion of the surface of one light-transmitting protrusion extends along the direction a, and the outgoing direction of the light is the direction B, the light tends to diffuse in the direction C when entering the air through the light-transmitting protrusion, and the direction C is perpendicular to both the direction a and the direction B; therefore, the extension direction of the convergent part and/or the divergent part of the surface of the light-transmitting bulge is reasonably arranged, so that the light diffusion direction can be controlled, and the viewing angle of the curled projection screen can be directionally controlled.

In a possible implementation manner of the first aspect, the haze value of the surface of the light-transmitting protrusion ranges from 12% to 20%. By this arrangement, the light is prevented from being specularly reflected on the surface of the lens bump, and further, the formation of a clear image on the ceiling is prevented.

In a possible implementation manner of the first aspect, the rollable projection screen further includes a coloring layer, where the coloring layer is disposed between two adjacent flexible substrate layers; the colored layer includes a flexible colored base layer and a dark dye disposed in the flexible colored base layer. The provision of a coloured layer may enhance the contrast of the rollable projection screen. Meanwhile, the coloring layer is arranged between two adjacent flexible substrate layers, if the flexible coloring basal layer is made of adhesive, the two adjacent flexible substrate layers can be fixed together through the coloring layer, the coloring layer does not need to be specially manufactured first, then the coloring layer and the two adjacent flexible substrate layers are respectively fixed through glue, and the complexity of the curled projection screen during manufacturing is reduced.

In one possible implementation of the first aspect, a dark dye is distributed in one of the flexible substrate layer, the fresnel lens layer, and the reflective layer. By the arrangement, the contrast ratio of the curled projection screen can be improved, and meanwhile, a coloring layer is not required to be arranged, so that the number of layers and the thickness of the curled projection screen can be reduced, and curling of the curled projection screen is facilitated. In addition, if the dark dye is distributed in the reflecting layer, the reflecting layer can not only play a role of reflecting light (the reflecting material is generally distributed in the reflecting layer) but also play a role of improving the contrast of the rollable projection screen, and the light can only be absorbed by the dark dye when being reflected on the reflecting layer, so that the light energy loss is smaller, and the brightness of the rollable projection screen is higher. When the reflective layer is manufactured, a reflective material (such as aluminum) is generally dissolved in a solvent and then sprayed onto the Fresnel lens layer, the reflective material is agglomerated when dissolved in the solvent, and in order to prevent the reflective material from agglomerating, a polymerization inhibitor/dispersing agent is added in the solvent, and a dark dye is generally an organic dye, so that the effect of the polymerization inhibitor/dispersing agent can be weakened slightly, the reflective material is agglomerated slightly, the flatness of the reflective layer is reduced slightly, light can be scattered to a greater extent when irradiated on the reflective layer, the diffusion degree of the light is greater, and the viewing angle of the curled projection screen can be improved. In addition, the dark dye is generally an organic dye, the organic dye can be dissolved in a high-molecular polymer and an organic solvent, the Fresnel lens layer is generally made of UV glue, the UV glue is a high-molecular polymer, and the dark dye has strong binding force with the Fresnel lens layer, so that the adhesion fastness of the whole reflective layer attached to the Fresnel lens layer is high.

In a possible implementation manner of the first aspect, the rollable projection screen further includes a flexible diffusion layer disposed between two adjacent flexible substrate layers, and the rollable projection screen further includes a cavity for containing a gas; the flexible diffusion layer comprises a light scattering structure arranged on one flexible substrate layer, and the light scattering structure is away from the light scattering surface of the corresponding flexible substrate layer to serve as a part of the side wall of the cavity. The flexible diffusion layer comprises a light scattering structure, the light scattering surface of the light scattering structure forms a part of the side wall of the cavity, at least part of light can enter the gas in the cavity after passing through the light scattering structure and can be refracted, and the refractive index of the gas is small, so that the light can be diffused when entering the cavity from the light scattering structure, the effect of diffusing the light is realized, and the viewing angle of the flexible projection screen can be improved.

In a possible implementation manner of the first aspect, the diffusing particles are provided in the flexible substrate layer and/or the fresnel lens layer. So configured, light rays are dispersed by the diffusing particles as they propagate through the rollable projection screen, thereby increasing the viewing angle of the rollable projection screen.

In a second aspect, some embodiments of the application provide a projection system comprising a projector and a rollable projection screen according to any of the above aspects.

Because the projection system provided by the embodiment of the application comprises the curled projection screen according to any one of the technical schemes, the two projection systems can solve the same technical problems and achieve the same technical effects.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a prior art projection screen;

FIG. 2 is a schematic diagram illustrating a usage state of a projection system according to some embodiments of the present application;

FIG. 3 is a schematic view illustrating a usage state of a rollable projection screen according to some embodiments of the present application;

FIG. 4 is a schematic diagram of a rollable projection screen according to further embodiments of the present application;

FIG. 5 is a schematic diagram of a rollable projection screen according to further embodiments of the present application;

FIG. 6 is a schematic perspective view of the flexible surface layer of FIG. 5;

FIG. 7 is a schematic view of the path of light through the flexible surface layer of FIG. 5;

FIG. 8 is a schematic illustration of the structure of a flexible surface layer in a rollable projection screen according to still further embodiments of the present application;

FIG. 9 is a schematic illustration of the structure of a flexible surface layer in a rollable projection screen according to still further embodiments of the present application;

FIG. 10 is a schematic illustration of the structure of a flexible surface layer in a rollable projection screen according to still further embodiments of the present application;

FIG. 11 is a schematic view of a rollable projection screen according to still further embodiments of the present application;

FIG. 12 is a schematic view of a rollable projection screen according to still other embodiments of the present application;

FIG. 13 is a schematic illustration of the flexible substrate layer and diffusing structure of the rollable projection screen of FIG. 12 away from the Fresnel lens layer;

FIG. 14 is a schematic view of the path of light through the flexible substrate layer and light diffusing structure of FIG. 12;

FIG. 15 is a schematic view of a rollable projection screen according to still other embodiments of the present application;

FIG. 16 is a schematic perspective view of the rollable projection screen of FIG. 15;

FIG. 17 is a schematic illustration of the structure of a flexible substrate layer and a flexible diffusion layer in a rollable projection screen according to still further embodiments of the present application;

FIG. 18 is a schematic diagram of a flexible substrate layer and a flexible diffusion layer in a rollable projection screen according to still further embodiments of the present application.

Reference numerals:

101-a surface layer; 102-a coloring layer; 103-a diffusion layer; 104-a fresnel lens layer; 105-a reflective layer; 106-diffusing the particles; 107-a reflective surface; a 100-projection system; 1-a rollable projection screen; 11-a flexible substrate layer; a 12-fresnel lens layer; 121-a reflective surface; 13-a reflective layer; 14-an adhesive layer; 15-a flexible surface layer; 151-light-transmitting protrusions; 1511-a profile diverging section; 1512-a profile tapering section; 16-diffusing the particles; 17-a coloured layer; 18-a flexible diffusion layer; 181-astigmatism structure; 182-a base layer; 1821-elongated slots; 18211-profile diverging section; 18212-profile tapering section; 183-a first flexible diffusion layer; 184-a second flexible spreading layer; 2-a projector; 21-incident light; 22-outgoing light; 3-audience.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In practical applications, the absolute parallel or vertical effect is difficult to achieve due to limitations in equipment accuracy or installation errors. The description of the vertical, parallel or same direction in the application is not an absolute limiting condition, but means that the vertical or parallel structure arrangement can be realized within the preset error range, and the corresponding preset effect can be achieved, so that the technical effect of limiting the characteristics can be realized to the maximum extent, the corresponding technical scheme is convenient to implement, and the method has high feasibility.

In the description of the present application, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. Can be directly connected or indirectly connected through an intermediate medium, and can be communication 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 according to the specific circumstances.

In 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

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

The application provides a projection system which is used for projecting and playing pictures, images and the like for audiences.

Referring to fig. 2, fig. 2 is a schematic diagram illustrating a usage state of a projection system 100 according to some embodiments of the present application. The projection system 100 includes a rollable projection screen 1 and a projector 2. For convenience of description of the projection system 100, the present application will be described by taking a state in which the rollable projection screen 1 is unfolded in a certain vertical plane as an example, and a direction in which the viewer 3 looks at the rollable projection screen 1 is defined as a front view direction.

In use, projector 2 may be placed under the front of rollable projection screen 1 with viewer 3 in front of rollable projection screen 1 looking at rollable projection screen 1. The incident light ray 21 emitted from the projector 2 is directed to the rollable projection screen 1, and the incident light ray 21 is reflected by the rollable projection screen 1 to finally form an outgoing light ray 22 directed to the viewer 3, while being imaged in the rollable projection screen 1.

In the related art, a part of the film layer in the projection screen may use a harder material such as MS to improve the flatness of the projection screen. However, this can result in a stiffer overall projection screen, which in turn can not be crimped, and a projection screen that is not crimped can be more limited during shipping, installation and use. Accordingly, there is a need to design a new rollable projection screen to make the projection screen more convenient during transportation, installation and use.

Based on this, the present application provides a rollable projection screen 1, and referring to fig. 3, fig. 3 is a schematic view illustrating a usage state of the rollable projection screen 1 according to some embodiments of the present application. The rollable projection screen 1 comprises a flexible surface layer 15, a flexible substrate layer 11, a Fresnel lens layer 12 and a reflecting layer 13 which are sequentially laminated; the flexible substrate layer 11 is provided with multiple layers (the rollable projection screen 1 illustrated in fig. 3 is provided with two flexible substrate layers 11). The thickness of the front flexible substrate layer 11 is smaller than the thickness of the rear flexible substrate layer 11 in the crimping direction of the crimpable projection screen 1.

Note that, the curl direction of the above-described curled projection screen 1 may be a counterclockwise direction as indicated by a solid arrow in fig. 3, or may be a clockwise direction opposite to the counterclockwise direction as indicated by the solid arrow in fig. 3.

When the curl direction of the rollable projection screen 1 is counterclockwise as indicated by the solid arrow in fig. 3, the flexible substrate layer 11 distant from the fresnel lens layer 12 is located on the front side of the flexible substrate layer 11 close to the fresnel lens layer 12, i.e., the thickness of the flexible substrate layer 11 distant from the fresnel lens layer 12 is smaller than the thickness of the flexible substrate layer 11 close to the fresnel lens layer 12.

When the curl direction of the rollable projection screen 1 is in a clockwise direction opposite to the counterclockwise direction indicated by the solid arrow in fig. 3, the flexible substrate layer 11 close to the fresnel lens layer 12 is located on the front side of the flexible substrate layer 11 away from the fresnel lens layer 12, i.e., the thickness of the flexible substrate layer 11 close to the fresnel lens layer 12 is smaller than the thickness of the flexible substrate layer 11 away from the fresnel lens layer 12.

The two adjacent flexible substrate layers 11 are adhered together by the adhesive layer 14, and the adhesive layer 14 may be OCA adhesive, of course, also may be UV adhesive (UV is short for Ultra-Violet ray, that is, ultraviolet, UV adhesive is also called photosensitive adhesive, ultraviolet curing adhesive, shadowless adhesive, UV photo curing adhesive, etc.), or other adhesive, as long as the two adjacent flexible substrate layers 11 can be adhered together.

In the rollable projection screen 1 illustrated in fig. 3, two flexible substrate layers 11 are provided, and in other embodiments, three, four or more flexible substrate layers 11 may be provided for the rollable projection screen 1, and the rollable projection screen 1 may be designed according to the actual situation.

The flexible substrate layer 11 of the rollable projection screen 1 is made of a flexible material, for example, a PU flexible substrate layer made of PU material. The PU has the advantages of flexibility, free deformation due to random curling, wear resistance, high temperature resistance, high toughness, oil resistance, strong mechanical property and the like, and the PU flexible substrate layer is made of the PU, so that the flexible substrate layer 11 has flexibility and can realize the curling.

Of course, in other embodiments, the flexible substrate layer 11 may be made of other flexible materials, for example, the TPU flexible substrate layer may be made of a TPU material, the TPU has elasticity, the curl may be achieved, the TPU flexible substrate layer is made of TPU, and the flexible substrate layer 11 may be made flexible and the curl may be achieved. Alternatively, the flexible base material layer 11 may be made of a flexible material such as PET (Polyethylene terephthalate ), SBC (Styrenic Block Copolymers, styrene thermoplastic elastomer, also called styrene block copolymer), or the like, and the flexible base material layer 11 may be flexible and crimpable.

The flexible substrate layer 11 serves as a support foundation throughout the rollable projection screen 1 so that the entire rollable projection screen 1 has a certain flatness when unfolded. The more the number of layers of the flexible substrate layer 11 is, the greater the thickness of each flexible substrate layer 11 is, and the better the flatness of the rollable projection screen 1 is. The flexible substrate layer 11 also serves as a base for the fresnel lens layer 12 and the flexible surface layer 15 when they are fabricated.

The fresnel lens layer 12 may be made of UV glue cured, and the fresnel lens layer 12 may be curled because the UV glue has elasticity. The side of the fresnel lens layer 12 far away from the flexible substrate layer 11 is provided with a plurality of reflecting surfaces 121 which are arranged along the up-down direction, each reflecting surface 121 is a plane which is inclined from top to bottom along the front view direction, the included angle theta between each reflecting surface 121 and the horizontal plane gradually becomes larger from top to bottom, and the included angle theta takes a value within the range of 5 degrees to 85 degrees.

When the Fresnel lens layer 12 is manufactured, UV glue is coated on the flexible substrate layer 11 closest to the Fresnel lens layer 12, then the Fresnel lens layer 12 is stamped by a special die, so that the Fresnel lens layer 12 is formed, then the UV glue is cured by using a UV light source lamp, and then the manufacture of the Fresnel lens layer 12 can be completed by demolding. Of course, in other embodiments, the Fresnel lens layer 12 may be made of heat curable glue, as well.

After the fresnel lens layer 12 is manufactured, a reflective layer 13 is coated on each reflective surface 121, and the reflective material in the reflective layer 13 may be aluminum; of course, in other embodiments, the reflective material in the reflective layer 13 may be silver, or a combination of silver and aluminum may be used.

Taking aluminum as an example of a reflective material, in order to increase the gain of the rollable projection screen 1, the diameter of the aluminum particles is in the range of 5 μm to 20 μm. In this way, since the aluminum particles have smaller diameters, the directivity is not obvious, and most of the light emitted from the projector 2 can be directionally reflected out of the rollable projection screen 1 according to the arrangement of the reflecting surface 121 on the fresnel lens layer 12, so that the light is not scattered everywhere, and the gain of the rollable projection screen 1 is high. In addition, because the diameter of the aluminum particles is small, the mutual interference between the aluminum particles is small when the reflecting surface 121 is covered, and the thickness of the reflecting layer 13 can be made thin under the condition that the requirement of entirely covering the reflecting surface 121 is satisfied; while the thinner the reflective layer 13 is, the less aluminum is consumed for the reflective material, which can save costs.

Of course, in other embodiments, when aluminum is selected, the scale-like aluminum powder may be selected, and the ratio of the diameters of the scale-like aluminum powder may be in the range of (40:1) to (100:1), and the ratio of the diameters of the scale-like aluminum powder is relatively large, so that the aluminum has a strong binding ability and is not easily detached when the aluminum is sprayed on the reflecting surface 121.

After the reflective layer 13 is formed, a metal layer is generally coated on the fresnel lens layer 12, and the thickness is very thin, so that the whole reflective layer 13 can be curled, and the fresnel lens layer 12 can also be curled, so that after the reflective layer 13 is coated on the fresnel lens layer 12, the fresnel lens layer 12 and the reflective layer 13 are still flexible, and curling can be realized.

Providing the flexible surface layer 15 can prevent the surface of the rollable projection screen 1 from being scratched, thereby affecting the display effect of the rollable projection screen 1. The flexible surface layer 15 is made of a flexible material. By way of example, the flexible surface layer 15 may be made of UV glue cured, which enables the flexible surface layer 15 to curl because of its elasticity.

When the flexible surface layer 15 is manufactured, the flexible surface layer 15 can be manufactured by coating the UV glue on the flexible substrate layer 11 farthest from the Fresnel lens layer 12 and then curing the UV glue by using a UV light source lamp. Of course, in other embodiments, the flexible surface layer 15 may be heat cured on the flexible substrate layer 11 by a heat curable glue, as well.

Based on this, since the flexible surface layer 15, the flexible substrate layer 11, the fresnel lens layer 12, and the reflection layer 13 can be curled, the rollable projection screen 1 can be curled, thereby making the rollable projection screen 1 very convenient in transportation, installation, and use.

In addition, in the curling direction of the curled projection screen 1, the curling degree of the front flexible substrate layer 11 is larger than the curling degree of the rear flexible substrate layer 11, so the front flexible substrate layer 11 is more easily damaged, while the thickness of the front flexible substrate layer 11 is smaller than that of the rear flexible substrate layer 11, so the front flexible substrate layer 11 has larger curling degree, but the curling degree is reduced due to the thinner thickness, so the compression deformation degree at the curling position is relaxed, and the front flexible substrate layer 11 is prevented from being damaged. At the same time, the whole rollable projection screen 1 is easier to roll up, and the bounce is weaker after rolling up.

In addition to the above, the thickness difference between the adjacent two flexible base material layers 11 is set to a value ranging from 30 μm to 50 μm, and for example, 30 μm, 40 μm, 50 μm, or the like can be selected. The thickness difference between the adjacent two flexible substrate layers 11 is set to be in the range of 30 μm to 50 μm, so that the curled projection screen 1 is easier to curl up, and the flexible substrate layer 11 which is positioned in front in the curling direction is less likely to be damaged.

Of course, in other embodiments, even if the thickness difference between the adjacent two flexible substrate layers 11 is set outside the above-described range of 30 μm to 50 μm, it is possible to use, for example, 25 μm, 55 μm, or the like.

In order to make the flatness of the rollable projection screen 1 high when unfolded, and not to affect the normal rolling of the rollable projection screen 1. In some embodiments, the thickness of each flexible substrate layer 11 is set to be 75 μm-300 μm, for example, 75 μm, 100 μm, 150 μm, 200 μm, 250 μm or 300 μm may be selected, and the thickness may be selected according to practical situations.

Of course, in other embodiments, the thickness of each flexible substrate layer 11 may be set outside the above-mentioned range of 75 μm to 300 μm, and for example, 50 μm, 350 μm, or the like may be selected.

Referring to fig. 3, in use, the incident light 21 emitted from the projector 2 irradiates the rollable projection screen 1, and the incident light 21 enters the rollable projection screen 1 and is reflected by the reflective layer 13 at the fresnel lens layer 12, and finally exits the rollable projection screen 1 to form an outgoing light 22 and irradiates the viewer 3. The path of the light in fig. 3 is only schematic and the refraction of the light is ignored.

Referring to fig. 4, fig. 4 is a schematic structural view of a rollable projection screen 1 according to still other embodiments of the present application. In still other embodiments, to achieve anti-ceiling light reflection, the surface of the flexible surface layer 15 remote from the fresnel lens layer 12 is coated with diffusing particles 16. The diffusion particles 16 are coated so that the haze value of the surface of the flexible surface layer 15 remote from the fresnel lens layer 12 is large, avoiding specular reflection of light when it impinges on the surface of the flexible surface layer 15 remote from the fresnel lens layer 12, thereby preventing the formation of a clear image on the ceiling. In addition, when the light is irradiated on the surface of the flexible surface layer 15 away from the fresnel lens layer 12, the light is dispersed by the diffusing particles 16, so that the light is more dispersed, and thus the viewing angle of the rollable projection screen 1 can be improved. The material of the diffusion particles 16 may be PMMA.

To achieve ceiling anti-reflection, in still other embodiments, the haze value of the surface of the flexible surface layer 15 remote from the fresnel lens layer 12 may be set directly to a value in the range of 12% -20%. For example, the haze value may be set to 12%, 15%, 18%, 20%, or the like, and may be used. When the haze value of the surface of the flexible surface layer 15 away from the fresnel lens layer 12 is within this range, the light is irradiated on the surface of the flexible surface layer 15 away from the fresnel lens layer 12 without specular reflection, and thus anti-ceiling light reflection can be achieved.

Setting the haze value of the surface of the flexible surface layer 15 remote from the fresnel lens layer 12 to a value in the range of 12% -20% can be achieved by at least the following means: 1) AG-treating (i.e., antiglare treatment) the surface of the flexible surface layer 15 remote from the fresnel lens layer 12; 2) The surface of the flexible surface layer 15 remote from the fresnel lens layer 12 is embossed with a embossing pattern by means of a die.

Based on this, when the flexible surface layer 15 is manufactured, UV glue is coated on the side surface of the flexible substrate layer 11 away from the fresnel lens layer 12, then the flexible surface layer 15 is embossed with a special mold, so that the flexible surface layer 15 is molded, then the UV glue is cured with a UV light source lamp, and then the manufacturing of the flexible surface layer 15 is completed by demolding.

Of course, in some embodiments, providing the surface of the flexible surface layer 15 remote from the fresnel lens layer 12 with a haze value of greater than 20% also enables anti-ceiling glare, but the anti-ceiling glare effect is better and the definition of the rollable projection screen 1 is better when the haze value is in the range of 12% -20%.

In addition, if the ceiling reflection resistance is not considered, in order to obtain higher definition, the surface of the flexible surface layer 15 away from the fresnel lens layer 12 may be provided as a smooth surface, so that the diffusion of light at the surface of the flexible surface layer 15 away from the fresnel lens layer 12 may be reduced, and the definition of the rollable projection screen 1 may be improved.

Referring to fig. 5 and 6, fig. 5 is a schematic structural view of a rollable projection screen 1 according to still other embodiments of the present application, and fig. 6 is a schematic structural view of a flexible surface layer 15 in fig. 5. In still other embodiments, the surface of the flexible surface layer 15 remote from the fresnel lens layer 12 is provided with a plurality of light-transmitting protrusions 151, the surface of the light-transmitting protrusions 151 having a taper and/or taper in a direction away from the fresnel lens layer 12.

By way of example, the light-transmitting protrusions 151 provided on the flexible surface layer 15 are of a linear semi-cylindrical structure, i.e., the light-transmitting protrusions 151 are semicircular in cross section taken by a plane perpendicular to the length extension direction thereof. The light-transmitting protrusions 151 on the flexible surface layer 15 are press-molded by a mold at the time of manufacturing the flexible surface layer 15.

In order to simplify the shape of the mold, the mold is convenient to manufacture and the manufacturing cost of the mold is reduced. The size of the semicircular cross section of each light-transmitting protrusion 151 is the same throughout the length extension direction thereof, and the shape and size of each light-transmitting protrusion 151 on the flexible surface layer 15 are the same.

By way of example, each of the light-transmitting protrusions 151 shown in fig. 5 extends in a vertical direction and is arranged in parallel in a horizontal direction, which is a direction perpendicular to both the front view direction and the vertical direction, and the length extending direction of each of the light-transmitting protrusions 151 is parallel to the flexible substrate layer 11. The light-transmitting protrusions 151 provided on the flexible surface layer 15 are arranged continuously in the horizontal direction, that is, adjacent light-transmitting protrusions 151 are connected in sequence.

In order to prevent the crimpability of the flexible surface layer 15 from being lowered due to the excessively large cross-sectional dimension of the light-transmitting protrusions 151, the diameter of the semicircular cross section of the light-transmitting protrusions 151 taken by a plane perpendicular to the length extending direction thereof is set to a value ranging from 20 μm to 300 μm.

The cambered surface of each light-transmitting protrusion 151 faces away from the fresnel lens layer 12, and the plane of each light-transmitting protrusion 151 opposite to the cambered surface faces toward the fresnel lens layer 12, which corresponds to the fact that the straight line of the semicircular section of each light-transmitting protrusion 151 taken by the plane perpendicular to the length extending direction thereof is located on the side of the arc line close to the fresnel lens layer 12, the outline of the semicircular section tapers in the direction away from the fresnel lens layer 12, and correspondingly, the cambered surface of each light-transmitting protrusion 151 tapers in the direction away from the fresnel lens layer 12.

Referring to fig. 7, fig. 7 is a schematic view of a path of light passing through the flexible surface layer 15 in fig. 5, and broken lines and arrows in fig. 7 are schematic views of a path of light entering the air after passing through the flexible surface layer 15. During the light emitting process, the light passes through each light-transmitting protrusion 151 and enters the air, so that refraction occurs, and the light is diffused because the refractive index of the UV glue (i.e. the material for manufacturing the flexible surface layer 15) is necessarily greater than that of the air. And each of the light-transmitting protrusions 151 has an arc surface tapered in a direction away from the fresnel lens layer 12 and extending in a vertical direction, so that light tends to spread in a horizontal direction, and a viewing angle of the rollable projection screen 1 in the horizontal direction can be improved by the light-transmitting protrusions 151.

In other embodiments, the length of the light-transmitting protrusions 151 may extend along other directions, and accordingly, the light may diffuse along a certain setting direction after passing through each light-transmitting protrusion 151 during the exiting process, where the setting direction is perpendicular to the front viewing direction and the length extending direction of each light-transmitting protrusion 151, so as to improve the viewing angle of the rollable projection screen 1 in the setting direction.

The above-mentioned light-transmitting protrusions 151 are not limited to the semi-cylindrical structure, and the shape of the light-transmitting protrusions 151 is not limited to a half of a certain cylindrical structure, and in some cases, the area of the cross section of the light-transmitting protrusions 151 taken by a plane perpendicular to the longitudinal extending direction thereof may be larger than or smaller than the area of a corresponding semicircle, where the corresponding semicircle refers to a semicircle corresponding to a circle having the same curvature as the light-transmitting protrusions 151.

The above description has been given taking, as an example, each light-transmitting protrusion 151 as a long-strip-shaped protrusion having a longitudinal extension direction parallel to the flexible substrate layer 11. In other embodiments, the light-transmitting protrusion 151 may be a protrusion with other shapes, for example, a columnar structure, the axis of the columnar structure is perpendicular to the fresnel lens layer 12, one end of the columnar structure away from the fresnel lens layer 12 has an arc surface, the arc surface tapers or gradually expands in the front view direction, the arc surface is a strip-shaped arc surface, and the length of the strip-shaped arc surface extends in the direction parallel to the flexible substrate layer 11, so that light diffusion can be achieved.

The above description has been made taking the example in which each light-transmitting protrusion 151 has a semi-cylindrical structure, and each light-transmitting protrusion 151 has a semicircular cross section taken by a plane perpendicular to the longitudinal extension direction thereof. In other embodiments, each light-transmitting protrusion 151 may have a structure with other shapes, referring to fig. 8, fig. 8 is a schematic structural diagram of the flexible surface layer 15 in the rollable projection screen 1 according to still other embodiments of the present application, a cross section of each light-transmitting protrusion 151 taken by a plane perpendicular to the length extending direction of the light-transmitting protrusion may also be triangular, the corresponding light-transmitting protrusion 151 has a triangular prism structure, one side surface of the light-transmitting protrusion 151 faces the fresnel lens layer 12 (not shown in the drawings), and an edge opposite to the side surface faces away from the fresnel lens layer 12, so that the light-transmitting protrusion 151 tapers in a direction away from the fresnel lens layer 12 as a whole.

Alternatively, referring to fig. 9, fig. 9 is a schematic structural diagram of a flexible surface layer 15 in a rollable projection screen 1 according to still another embodiment of the present application, a cross section of each light-transmitting protrusion 151 taken by a plane perpendicular to a length extending direction thereof is trapezoidal, planes defining two straight lines parallel to each other in the trapezoidal cross section are a first side and a second side, an area of the first side is larger than an area of the second side, the first side faces the fresnel lens layer 12 (not shown in the drawing), and the second side faces away from the fresnel lens layer 12, and the light-transmitting protrusions 151 are tapered in a direction away from the fresnel lens layer 12 as a whole.

Of course, in other embodiments, the shape of the cross section of each light-transmitting protrusion 151 taken by a plane perpendicular to the length extending direction thereof is not limited to the above three, but may be other shapes as long as the above cross section has a contour tapered section and/or a contour gradually expanding section in a direction away from the fresnel lens layer 12, and referring to fig. 10, fig. 10 is a schematic structural view of the flexible surface layer 15 in the rollable projection screen 1 provided in still other embodiments of the present application, and the cross section of the light-transmitting protrusion 151 on the flexible surface layer 15 taken by a plane perpendicular to the length extending direction thereof has both the contour gradually expanding section 1511 and the contour gradually expanding section 1512 in a direction away from the fresnel lens layer 12 (not shown in the figure).

The above description is given taking an example in which each of the light-transmitting protrusions 151 has a semi-cylindrical structure parallel to each other and the semi-cylindrical structure has a linear shape. In other embodiments, the light-transmitting protrusions 151 may not be linear structures, for example, the light-transmitting protrusions 151 may be bent structures or curved structures, and the same may be used; the light-transmitting protrusions 151 may not be parallel to each other, and may be used as well.

The above description is given taking an example in which the respective light-transmitting protrusions 151 are arranged consecutively in the arrangement direction thereof. In other embodiments, the light-transmitting protrusions 151 may be arranged at intervals along the arrangement direction, and the same may be used.

The above description has been made taking the semi-cylindrical structure as an example of each light-transmitting protrusion 151, the cross section of the light-transmitting protrusion 151 taken by a plane perpendicular to the longitudinal extension direction thereof is the same at each place in the longitudinal extension direction thereof. In other embodiments, each of the light-transmitting protrusions 151 may not have a regular structure, and the cross-section of the light-transmitting protrusion 151 taken by a plane perpendicular to the longitudinal extension direction thereof may be different at all points along the longitudinal extension direction thereof, and the same may be used.

In order to resist reflection from the ceiling, the haze value of the surface on which the light-transmitting protrusions 151 are provided is in the range of 12% to 20% on the basis that the light-transmitting protrusions 151 are provided on the flexible surface layer 15. For example, the haze value may be set to 12%, 15%, 18%, 20%, or the like, and may be used. When the haze value of the surface of the light-transmitting protrusions 151 is within this range, the light is irradiated on the surface of the light-transmitting protrusions 151 without specular reflection, and thus the ceiling reflection can be prevented.

Setting the haze value of the surface of the light-transmitting protrusions 151 to a value in the range of 12% -20% can be achieved by at least the following two ways: 1) AG treatment (i.e., antiglare treatment) is performed on the surface of the light-transmitting projections 151; 2) The surface of the light-transmitting protrusions 151 is embossed with the embossing pattern by a mold.

Referring to fig. 11, fig. 11 is a schematic structural view of a rollable projection screen 1 according to still other embodiments of the present application. In order to improve the contrast of the rollable projection screen 1, the rollable projection screen 1 further comprises a colored layer 17, the colored layer 17 being arranged between two adjacent flexible substrate layers 11. The colored layer 17 includes a flexible colored base layer and a dark dye provided in the flexible colored base layer.

The dark dye is generally an organic dye, and azo dyes, phthalocyanine dyes and the like can be selected. The flexible color base layer is made of a flexible material so that the color layer 17 as a whole has flexibility to allow curling without affecting the curling performance of the entire curled projection screen 1. For example, the material of the flexible coloring base layer may be PET, PU, TPU, SBC, in which case the coloring layer 17 is adhered and fixed to the adjacent two flexible substrate layers 11 through the adhesive layer 14 after the coloring layer 17 is manufactured. Of course, the material of the flexible coloring base layer may also be UV glue, OCA glue or heat-curable glue, in which case the coloring layer 17 may be formed directly on one flexible substrate layer 11 and then bonded to the other flexible substrate layer 11 by its own adhesive property during curing, without being bonded and fixed to the flexible substrate layer 11 by a special adhesive layer 14.

Of course, in some embodiments, the contrast of the rollable projection screen 1 may be enhanced by other means without the provision of a dedicated colored layer 17. For example, a dark dye may be provided in one of the flexible substrate layer 11, the fresnel lens layer 12, or the reflective layer 13, and the contrast of the rollable projection screen 1 may be improved as well. It should be noted that in order to prevent the rollable projection screen 1 from being low in brightness when in use, it is preferable to provide a dark dye in only one of the film layers.

When the dark dye is provided in the reflective layer 13, on the basis of improving the contrast of the rollable projection screen 1, light is only absorbed by a part of energy by the dark dye when reflected at the reflective layer 13, so that the energy loss is small (if the colored layer 17 is provided, light is absorbed by the dark dye in the colored layer 17 twice before and after being reflected by the reflective layer 13, the energy loss is large), and thus the rollable projection screen 1 has high brightness when in use. Furthermore, no special coloring layer 17 is arranged in the rollable projection screen 1, so that the thickness of the whole rollable projection screen 1 is smaller, and the rollable projection screen 1 is more beneficial to crimping. In addition, the dark dye enables the aluminum powder to slightly agglomerate in the solvent (the aluminum powder can be dissolved in the solvent when the reflecting layer 13 is manufactured and then sprayed on the reflecting surface 121 of the Fresnel lens layer 12), so that the flatness of the reflecting layer 13 is slightly reduced, and the light can be scattered to a greater extent when the light irradiates on the reflecting layer 13, so that the light diffusion degree can be improved. The dark dye is an organic dye, the organic dye can be dissolved in a high molecular polymer and an organic solvent, the Fresnel lens layer 12 is made of UV glue, and the UV glue is a high molecular polymer, so that the binding force between the dark dye and the Fresnel lens layer 12 is strong, and the adhesion fastness of the whole reflective layer 13 on the Fresnel lens layer 12 is high.

Referring to fig. 12 and 13, fig. 12 is a schematic view illustrating a usage state of a rollable projection screen 1 according to still other embodiments of the present application, and fig. 13 is a schematic view illustrating a structure of a flexible substrate layer 11 and a light scattering structure 181 of the rollable projection screen 1 away from the fresnel lens layer 12 in fig. 12. In order to increase the viewing angle of the rollable projection screen 1, the rollable projection screen 1 further comprises a flexible diffusion layer 18 arranged between adjacent two flexible substrate layers 11, the rollable projection screen 1 further comprising a cavity for containing a gas. The flexible diffusion layer 18 includes light diffusing structures 181 provided on one flexible substrate layer 11, the light diffusing structures 181 being remote from the light diffusing surface of the corresponding flexible substrate layer 11 as part of the cavity sidewall.

In fig. 12, two flexible substrate layers 11 are taken as an example, one flexible substrate layer 11 is away from the fresnel lens layer 12, and the other flexible substrate layer 11 is close to the fresnel lens layer 12. The light diffusing structures 181 are elongated protrusions disposed on the flexible substrate layer 11 far from the fresnel lens layer 12, and the flexible diffusion layer 18 includes a plurality of light diffusing structures 181, and in fig. 12, the flexible substrate layer 11 far from the fresnel lens layer 12 is the flexible substrate layer 11 corresponding to the flexible diffusion layer 18. The light scattering structure 181 is a linear semi-cylindrical structure, that is, the light scattering structure 181 is semicircular in cross section taken by a plane perpendicular to the length extension direction thereof, the semicircular cross sections of the light scattering structure 181 at all positions in the length extension direction thereof are the same in size, and the shape and the size of each light scattering structure 181 in the flexible diffusion layer 18 are the same.

Each of the light-diffusing structures 181 extends in the vertical direction and is arranged in parallel in the horizontal direction, the length extending direction of each of the light-diffusing structures 181 is parallel to the fresnel lens layer 12, and each of the light-diffusing structures 181 is arranged continuously in the horizontal direction, that is, adjacent light-diffusing structures 181 are connected in sequence.

The light diffusing structure 181 is made of UV glue, and the flexible diffusion layer 18 may be curled because of the elasticity of the UV glue; in order to prevent the flexibility of the flexible diffusion layer 18 from being lowered due to the oversized cross-sectional dimension of the light scattering structure 181, the diameter of the semicircular cross section of the light scattering structure 181 taken by a plane perpendicular to the length extending direction thereof ranges from 20 μm to 300 μm.

The curved surface of each light scattering structure 181 faces the fresnel lens layer 12, and the plane of each light scattering structure 181 opposite to the curved surface faces away from the fresnel lens layer 12, which is equivalent to that a straight line of a semicircular section of the light scattering structure 181 taken by a plane perpendicular to the length extending direction thereof is located on a side of the curved line away from the fresnel lens layer 12, and then the outline of the semicircular section tapers in the front view direction, and correspondingly, the curved surface of the entire light scattering structure 181 tapers in the front view direction.

When the flexible diffusion layer 18 is manufactured, the side surface, far away from the Fresnel lens layer 12, of the flexible substrate layer 11, facing the Fresnel lens layer 12, is directly coated with UV glue, then the flexible diffusion layer 18 is stamped by using a die with the shape matched with each light scattering structure 181, the UV glue is solidified by using a UV light source lamp, and then the manufacture of the flexible diffusion layer 18 can be completed by demolding. After the flexible diffusion layer 18 is released, the flexible diffusion layer 18 and the flexible substrate layer 11 adjacent to the fresnel lens layer 12 are bonded together by OCA adhesive.

After the flexible diffusion layer 18 is adhered and fixed to the flexible substrate layer 11 adjacent to the fresnel lens layer 12, the curved surface of each light diffusing structure 181 and the flexible substrate layer 11 adjacent to the fresnel lens layer 12 together enclose a plurality of cavities for accommodating air, and the curved surfaces of the light diffusing structures 181 form a part of the side walls of the cavities, and it should be noted that the OCA adhesive cannot fill the cavities when the flexible diffusion layer 18 and the flexible substrate layer 11 adjacent to the fresnel lens layer 12 are adhered and fixed. It should be noted that in other embodiments, the cavity may be configured to hold other gases, such as nitrogen, argon, methane, and the like. The cambered surface of the light scattering structure 181 is the light scattering surface of the light scattering structure 181.

Referring to fig. 14, fig. 14 is a schematic view of the path of light passing through the flexible substrate layer 11 and the light diffusing structure 181 of fig. 12 away from the fresnel lens layer 12. When light passes through the flexible diffusion layer 18 during incidence, the light enters the cavity at the corresponding position from each light scattering structure 181, so that refraction occurs, the light is diffused because the refractive index of the UV glue is necessarily larger than that of air, and the cambered surface of the light scattering structure 181 is tapered in the front view direction and extends along the vertical direction, so that the light tends to diffuse in the horizontal direction. Each portion of the diffusing surface of each diffusing structure 181 tapers in the front view direction.

Of course, in other embodiments, the light-diffusing structure 181 may be formed by coating UV glue on the side of the flexible substrate layer 11 near the fresnel lens layer 12 away from the fresnel lens layer 12, in which case, the cambered surface of the light-diffusing structure 181 faces away from the fresnel lens layer 12, the cambered surface of the light-diffusing structure 181 and the flexible substrate layer 11 far from the fresnel lens layer 12 enclose a cavity for containing air, and the light can reenter the flexible diffusion layer 18 after being reflected by the reflective layer 13, so that when the light passes through the flexible diffusion layer 18 during the outgoing process, the light will also enter the cavity at the corresponding position from each light-diffusing structure 181, so as to be refracted, thereby realizing light diffusion, and the light-diffusing structure 181 has a cambered surface that is gradually divergent in the front view direction and extends in the vertical direction, so that the light tends to diffuse in the horizontal direction. In this case, each portion of the light-diffusing surface of each light-diffusing structure 181 diverges in the front view direction.

The respective light diffusing structures 181 in the flexible diffusion layer 18 extend in the vertical direction so that light tends to diffuse in the horizontal direction when passing through the flexible diffusion layer 18, and the viewing angle of the rollable projection screen 1 in the horizontal direction can be improved. In other embodiments, the length of the light diffusing structure 181 may extend in any other direction, and correspondingly, the light may diffuse toward another set direction when passing through the flexible diffusion layer 18, and the set direction is perpendicular to both the forward viewing direction and the length extending direction of the light diffusing structure 181, so that the viewing angle of the rollable projection screen 1 in the set direction may be improved.

When the rollable projection screen 1 is used, light is diffused along a set direction, but not indiscriminately diffused along all directions, so that the light diffusion degree can be reduced, and the definition and the brightness of the rollable projection screen 1 can be improved on the basis of improving the viewing angle of the rollable projection screen 1.

In other embodiments, other modifications may be made to the structural shape and arrangement of the light scattering structures 181 in fig. 12 and 13, and specific reference may be made to the above-described modifications of the light-transmitting protrusions 151 in the flexible surface layer 15, and the modifications are similar, and will not be repeated herein.

The above description is given taking an example in which one flexible diffusion layer 18 is provided between two adjacent flexible substrate layers 11. Referring to fig. 15 and 16, fig. 15 is a schematic view illustrating a usage state of a rollable projection screen 1 according to still other embodiments of the present application, and fig. 16 is a schematic view illustrating a perspective structure of the rollable projection screen 1 in fig. 15. In fig. 15 and 16, two flexible substrate layers 11 are exemplified, one flexible substrate layer 11 being distant from the fresnel lens layer 12 and the other flexible substrate layer 11 being close to the fresnel lens layer 12. In other embodiments, two flexible diffusion layers 18 may also be disposed between two adjacent flexible substrate layers 11, such as first flexible diffusion layer 183 and second flexible diffusion layer 184 in fig. 15, respectively. The first flexible diffusion layer 183 includes a first light diffusing structure that is an elongated protrusion disposed on the flexible substrate layer 11 away from the fresnel lens layer 12. The second flexible diffusion layer 184 includes a second light diffusing structure that is an elongated protrusion disposed on the flexible substrate layer 11 adjacent to the fresnel lens layer 12. The first and second light diffusing structures are similar to light diffusing structure 181 of fig. 12 and 13 described above, and are not described again here,

The first flexible diffusion layer 183 and the second flexible diffusion layer 184 are fixed by OCA adhesion, and after the first flexible diffusion layer 183 and the second flexible diffusion layer 184 are fixed by OCA adhesion, a plurality of cavities for accommodating air are enclosed together between the respective elongated projections of the first flexible diffusion layer 183 and the second flexible diffusion layer 184.

When the lengths of the elongated protrusions of the first flexible diffusion layer 183 and the second flexible diffusion layer 184 are perpendicular to each other, specifically, the lengths may be: the length of each elongated protrusion in the first flexible diffusion layer 183 extends in the vertical direction, and the length of each elongated protrusion in the second flexible diffusion layer 184 extends in the horizontal direction.

When light passes through the first flexible diffusion layer 183 during incidence, the light enters the cavity at the corresponding position from each strip-shaped bulge in the first flexible diffusion layer 183, so that refraction occurs, and light diffusion is realized.

When light passes through the second flexible diffusion layer 184 in the emergent process, the light enters the cavity at the corresponding position from each strip-shaped bulge in the second flexible diffusion layer 184, so that refraction occurs, and light diffusion is further realized.

It should be noted that the OCA glue between the first flexible diffusion layer 183 and the second flexible diffusion layer 184 is used only for bonding between the two, and the OCA glue should not be excessively filled into the cavities between the elongated protrusions.

The first flexible diffusion layer 183 and the second flexible diffusion layer 184 are provided to diffuse light in different directions, thereby expanding the viewing angle of the rollable projection screen 1 in different directions.

In other embodiments, other variations may be made to the structural shapes and arrangements of the elongated protrusions in the first flexible diffusion layer 183 and the second flexible diffusion layer 184 in fig. 15 and 16, and specific reference may be made to the deformation of the light-transmitting protrusions 151 in the flexible surface layer 15 described above, and the various variations of the two are similar and will not be repeated herein.

The longitudinal extension direction of each elongated protrusion in the first flexible diffusion layer 183 is perpendicular to the longitudinal extension direction of each elongated protrusion in the second flexible diffusion layer 184. In other embodiments, the length extension direction of each elongated protrusion in the first flexible diffusion layer 183 and the length extension direction of each elongated protrusion in the second flexible diffusion layer 184 may be different, for example: the projection of the axis of one elongated protrusion of the first flexible diffusion layer 183 onto the fresnel lens layer 12 is defined as a first straight line, the projection of the axis of one elongated protrusion of the second flexible diffusion layer 184 onto the fresnel lens layer 12 is defined as a second straight line, and the extending direction of the first straight line and the extending direction of the second straight line form an acute angle, and the value of the acute angle may be selected in the range of 30 ° or more and less than 90 °, and the same may be used.

In other embodiments, the flexible diffusion layer 18 may take other forms. Referring to fig. 17, fig. 17 is a schematic structural diagram of a flexible substrate layer 11 and a flexible diffusion layer 18 in a rollable projection screen 1 according to still other embodiments of the present application. The flexible diffusion layer 18 includes a base layer 182 disposed on the flexible substrate layer 11 remote from the fresnel lens layer 12 (not shown in the drawings), and the flexible substrate layer 11 remote from the fresnel lens layer 12 constitutes the flexible substrate layer 11 corresponding to the flexible diffusion layer 18. The base layer 182 is fabricated from UV glue, which is resilient, so that the base layer 182 may be curled, thereby allowing the flexible diffusion layer 18 to be curled.

The base layer 182 is provided with a plurality of elongated grooves 1821 on a side away from the corresponding flexible substrate layer 11, the elongated grooves 1821 are linear grooves, the elongated grooves 1821 are semicircular grooves, that is, the shape of the simulated section of the elongated grooves 1821 taken by a plane perpendicular to the length extending direction is semicircular, and the sizes of the simulated sections of the elongated grooves 1821 are the same throughout the length extending direction. The outline of the semicircular analog section taken by a plane perpendicular to the longitudinal extension direction of the long groove 1821 is gradually widened in the front view direction when the line of the semicircular analog section is positioned on the side of the arc away from the corresponding flexible base material layer 11, and the groove wall surface of the corresponding long groove 1821 is gradually widened in the front view direction. Each of the elongated grooves 1821 extends in the vertical direction and is arranged in parallel in the horizontal direction, and the length extending direction of the elongated groove 1821 is parallel to the corresponding flexible substrate layer 11. The structures of the elongated slots 1821 provided in the base layer 182 are identical.

When the base layer 182 is manufactured, the side surface, facing the Fresnel lens layer 12, of the flexible substrate layer 11 far away from the Fresnel lens layer 12 is coated with UV glue, then the base layer 182 is stamped by using a die with the shape matched with each long groove 1821, then the UV glue is solidified by using a UV light source lamp, and then the manufacture of the base layer 182 can be completed after demolding.

After the base layer 182 is manufactured, the base layer 182 is adhered and fixed to the flexible substrate layer 11 adjacent to the fresnel lens layer 12 by using OCA glue, the groove wall surface of each long groove 1821 and the flexible substrate layer 11 adjacent to the fresnel lens layer 12 enclose a cavity for accommodating air, and it should be noted that the OCA glue is only required to adhere the base layer 182 to the flexible substrate layer 11 adjacent to the fresnel lens layer 12, and not excessively enter the long grooves 1821.

When light passes through the base layer 182 during incidence, the light enters the corresponding cavity from the groove wall surface of each long groove 1821, so that refraction occurs, and light is diffused, and the light tends to be diffused in the horizontal direction because the groove wall surface of the long groove 1821 is gradually expanded in the front view direction and extends in the vertical direction. Each of the elongated grooves 1821 constitutes an astigmatism structure provided on the base layer 182, the groove wall surface of each of the elongated grooves 1821 constitutes an astigmatism surface of the astigmatism structure, and each portion of the astigmatism surface in this embodiment 2 is divergent in the front view direction.

The length of each elongated slot 1821 in the base layer 182 extends in a vertical direction so that light tends to spread horizontally as it passes through the flexible diffusion layer 18, thereby improving the viewing angle of the rollable projection screen 1 in the horizontal direction. In other embodiments, the length of the elongated slot 1821 may extend in any other direction, and accordingly, light may tend to diffuse in a set direction when passing through the flexible diffusion layer 18, where the set direction is perpendicular to both the front view direction and the length extension direction of the elongated slot 1821, thereby increasing the viewing angle of the rollable projection screen 1 in the set direction.

The above description has been given taking the elongated groove 1821 as an example, the length extending direction of which is parallel to the corresponding flexible substrate layer 11. In other embodiments, the elongated slot 1821 may be a groove of other shapes, such as a cylindrical slot, where the axis of the cylindrical slot is perpendicular to the corresponding flexible substrate layer 11, one end of the cylindrical slot near the corresponding flexible substrate layer 11 has a special-shaped section, the slot wall of the special-shaped section is an arc surface, the arc surface is gradually expanded along the front view direction, and the arc surface is a strip arc surface, and the length of the arc surface extends in a direction parallel to the corresponding flexible substrate layer 11, so that light diffusion can be achieved, the corresponding part of the special-shaped section forms a light scattering structure, and the arc surface forms a light scattering surface.

The description has been made taking the long grooves 1821 as semicircular grooves as an example, and each long groove 1821 has a semicircular cross section taken by a plane perpendicular to the longitudinal extension direction thereof. In other embodiments, each slot 1821 may be another slot 1821, such as: the analog cross section of each elongated slot 1821 taken perpendicular to the plane of its length extension may be triangular, or the analog cross section of each elongated slot 1821 taken perpendicular to the plane of its length extension may be trapezoidal, as well.

Of course, in other embodiments, the shape of the simulated cross section of each elongated slot 1821 taken by a plane perpendicular to the length extension direction thereof is not limited to the three above, and may be other shapes as long as the above-mentioned simulated cross section has a profile tapering section and/or a profile diverging section in the front view direction (the simulated cross section is semicircular and triangular, and the simulated cross section has only a profile diverging section in the front view direction; the simulated cross section is trapezoidal, and the simulated cross section may have only a profile diverging section or only a profile tapering section in the front view direction). Referring to fig. 18, fig. 18 is a schematic structural view of a flexible substrate layer 11 and a flexible diffusion layer 18 in a rollable projection screen 1 according to still other embodiments of the present application. The elongated slot 1821 provided in the base 182 shown in fig. 18 has both a diverging profile section 18211 and a tapered profile section 18212 in elevation, with a simulated cross-section taken perpendicular to the plane of its length extension, as well.

The above description has been given taking the elongated grooves 1821 as the linear grooves parallel to each other as an example. In other embodiments, the slot 1821 may not be a straight slot, for example, the slot 1821 may be a curved slot or a bent slot, as well.

The description has been made taking, as an example, the long grooves 1821 are semicircular grooves, and the shape of the simulated cross section of the long groove 1821 taken by the plane perpendicular to the longitudinal extension direction thereof is the same at all sides of the longitudinal extension direction thereof. In other embodiments, each of the elongated grooves 1821 may not be a regular groove, and the shape of the simulated cross section of the elongated groove 1821 taken along the plane perpendicular to the length direction thereof may be different at all points along the length direction thereof, and the same may be used.

In other embodiments, to increase the viewing angle of the rollable projection screen 1, diffusing particles may be disposed in at least one of the flexible substrate layer 11 and the fresnel lens layer 12, and the material of the diffusing particles may be PMMA.

For example, two flexible substrate layers 11 are provided, and diffusion particles may be selectively provided in one of the flexible substrate layers 11, or may be provided in both of the flexible substrate layers 11.

The present application also provides a rollable projection screen having the same structure as the rollable projection screen 1 in the projection system 100 described above, and will not be repeated here.

In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

The present application is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in 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

1. A rollable projection screen is characterized by comprising a flexible surface layer, a flexible substrate layer, a Fresnel lens layer and a reflecting layer which are sequentially arranged in a laminated manner; the flexible substrate layer is provided with a plurality of layers, and the thickness of the front flexible substrate layer is smaller than that of the back flexible substrate layer in the curling direction of the curled projection screen; a first flexible diffusion layer and a second flexible diffusion layer are arranged between two adjacent flexible substrate layers, and the second flexible diffusion layer is closer to the Fresnel lens layer than the first flexible diffusion layer; the first flexible diffusion layer comprises a plurality of first diffusion structures, the second flexible diffusion layer comprises a plurality of second diffusion structures, the extending direction of the first diffusion structures and the extending direction of the second diffusion structures form an included angle which is more than or equal to 30 degrees and less than or equal to 90 degrees, and a cavity for containing gas is formed between the plurality of first diffusion structures of the first flexible diffusion layer and the plurality of second diffusion structures of the second flexible diffusion layer.

2. The rollable projection screen of claim 1, wherein the thickness difference between adjacent flexible substrate layers is in the range of 30 μm to 50 μm.

3. The rollable projection screen according to claim 1 or 2, wherein the flexible substrate layer is a PU flexible substrate layer or a TPU flexible substrate layer.

4. The rollable projection screen according to claim 1 or 2, wherein the flexible substrate layer has a thickness ranging from 75 μm to 300 μm.

5. The rollable projection screen according to claim 1 or 2, wherein the surface of the flexible surface layer remote from the fresnel lens layer is coated with diffusing particles.

6. The rollable projection screen according to claim 1 or 2, wherein the haze value of the surface of the flexible surface layer remote from the fresnel lens layer ranges from 12% to 20%.

7. The rollable projection screen according to claim 1 or 2, wherein the flexible surface layer is provided with a plurality of light transmissive protrusions on a surface facing away from the fresnel lens layer, the light transmissive protrusions having tapered and/or diverging portions in a direction facing away from the fresnel lens layer.

8. The rollable projection screen of claim 7, wherein the haze value of the surface of the optically transmissive protrusions ranges from 12% to 20%.

9. The rollable projection screen of claim 1 or 2, further comprising a colored layer disposed between adjacent two of the flexible substrate layers; the colored layer includes a flexible colored substrate layer and a dark dye disposed in the flexible colored substrate layer.

10. The rollable projection screen of claim 1 or 2, wherein a dark dye is distributed in one of the flexible substrate layer, the fresnel lens layer, and the reflective layer.

11. The rollable projection screen according to claim 1 or 2, wherein the light diffusing surface of the first light diffusing structure is directed towards the second light diffusing structure as a part of the cavity side wall and the light diffusing surface of the second light diffusing structure is directed towards the first light diffusing structure as another part of the cavity side wall.

12. A projection system comprising a projector and a rollable projection screen according to any one of claims 1 to 11.