Rollable projection screen, preparation method thereof and projection device

Abstract

The invention discloses a rollable projection screen (1), a preparation method thereof and a projection device, and belongs to the technical field of projection. The rollable projection screen (1) comprises: a reflective layer (11) for reflecting light; the at least one functional layer (12) is stacked on one side or two sides of the reflecting layer (11); at least one of the functional layers (12) has a damping feature; the damping feature is used to convert vibrations of the rollable projection screen (1) into potential energy of the damping feature. By improving the functional layer (12), the jitter of the rollable projection screen (1) can be weakened, so that the projection screen has good flatness, and the display effect is ensured.

Description

Rollable projection screen and preparation method thereof, and projection device

[0001] The present disclosure claims priority to Chinese patent application No. 202211581132.9 filed on December 9, 2022, entitled “A rollable projection screen and its manufacturing method”, as well as priority to Chinese patent application No. 202310035137.X filed on January 10, 2023, entitled “A rollable projection screen and projection device”, and priority to Chinese patent application No. 202310041819.1 filed on January 11, 2023, entitled “A rollable projection screen and its manufacturing method”, the entire contents of which are incorporated by reference into the present disclosure. Technical Field

[0002] The present disclosure relates to the field of projection technology, and in particular to a rollable projection screen, a preparation method thereof, and a projection device. Background Art

[0003] In the field of projection display technology, a projector is typically used in conjunction with a projection screen. Light from the projector is projected onto the projection screen, where it reflects off the screen before reaching the viewer, who can then see the image formed by the light on the surface of the projection screen.

[0004] Public content

[0005] In one aspect, the present disclosure provides a rollable projection screen comprising a reflective layer and at least one functional layer. The reflective layer is configured to reflect light, and the at least one functional layer is stacked on one or both sides of the reflective layer. At least one of the functional layers has a damping characteristic. The damping characteristic is configured to convert vibrations of the rollable projection screen into potential energy of the damping characteristic.

[0006] The rollable projection screen provided in the disclosed embodiments features improved at least one of its functional layers, imparting damping properties to the modified layer. By arranging the damping layer, when the rollable projection screen is subjected to external forces, the forces are transferred and applied to the damping layer. In the disclosed embodiments, the damping layer is referred to as the damping layer. Friction and displacement within the damping layer dissipate external forces, thereby reducing jitter in the rollable projection screen and ensuring a quality display.

[0007] Another aspect of the present disclosure provides a projection device, comprising a projector and any of the above-mentioned rollable projection screens; the projector is located on one side of the rollable projection screen, and is used to project projection light toward the rollable projection screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG1 is a schematic diagram of a projection device in use according to an embodiment of the present disclosure;

[0009] FIG2 is a schematic structural diagram of a first exemplary rollable projection screen provided by an embodiment of the present disclosure;

[0010] FIG3 is a schematic structural diagram of a damping layer provided in an embodiment of the present disclosure;

[0011] FIG4 is a stress-strain curve diagram of a metal material and a polymer material;

[0012] FIG5 is a schematic structural diagram of weighted particles provided by an embodiment of the present disclosure when coated with a coating material;

[0013] FIG6 is a schematic diagram of the structure of the rollable projection screen when in use;

[0014] FIG7 is a schematic diagram of the forces at points A, B, and C in the rollable projection screen shown in FIG6 ;

[0015] FIG8 is a schematic diagram of a planar structure of a damping layer provided in an embodiment of the present disclosure;

[0016] FIG9 is a schematic structural diagram of a second exemplary rollable projection screen provided by an embodiment of the present disclosure;

[0017] FIG10 is a first schematic diagram of a process for manufacturing a rollable projection screen according to an embodiment of the present disclosure;

[0018] FIG11 is a second schematic diagram of a process for manufacturing a rollable projection screen according to an embodiment of the present disclosure;

[0019] FIG12 is a third schematic diagram of a process for manufacturing a rollable projection screen according to an embodiment of the present disclosure;

[0020] FIG13 is a fourth schematic diagram of a process for manufacturing a rollable projection screen according to an embodiment of the present disclosure;

[0021] FIG14 is a schematic structural diagram of a third exemplary rollable projection screen provided by an embodiment of the present disclosure;

[0022] FIG15 is a schematic structural diagram of a flexible variable layer provided by an embodiment of the present disclosure;

[0023] FIG16 is a schematic structural diagram of another flexible variable layer provided in an embodiment of the present disclosure;

[0024] FIG17 is a schematic structural diagram of another flexible variable layer provided in an embodiment of the present disclosure;

[0025] FIG18 is a schematic structural diagram of a fourth exemplary rollable projection screen provided by an embodiment of the present disclosure;

[0026] FIG19 is a schematic structural diagram of a fifth exemplary rollable projection screen provided by an embodiment of the present disclosure;

[0027] FIG20 is a schematic structural diagram of a surface layer provided by an embodiment of the present disclosure;

[0028] FIG21 is a schematic structural diagram of another surface layer provided in an embodiment of the present disclosure;

[0029] FIG22 is a schematic diagram of the structure of the micro-lens of the surface layer shown in FIG21 after atomization treatment;

[0030] FIG23 is a schematic structural diagram of a sixth exemplary rollable projection screen provided by an embodiment of the present disclosure;

[0031] FIG24 is a schematic structural diagram of a seventh exemplary rollable projection screen provided by an embodiment of the present disclosure;

[0032] FIG25 is a schematic structural diagram of an eighth exemplary rollable projection screen provided by an embodiment of the present disclosure;

[0033] FIG26 is a schematic structural diagram of a Fresnel lens layer provided by an embodiment of the present disclosure;

[0034] FIG27 is a schematic structural diagram of a reflective layer provided in an embodiment of the present disclosure;

[0035] FIG28 is a schematic structural diagram of another reflective layer provided in an embodiment of the present disclosure;

[0036] FIG29 is a fifth flow chart of a method for preparing a rollable projection screen according to an embodiment of the present disclosure;

[0037] FIG30 is a sixth flow chart of a method for preparing a rollable projection screen according to an embodiment of the present disclosure;

[0038] FIG31 is a schematic structural diagram of a ninth exemplary rollable projection screen provided by an embodiment of the present disclosure;

[0039] FIG32 is a schematic structural diagram of a tenth exemplary rollable projection screen provided by an embodiment of the present disclosure;

[0040] FIG33 is a schematic diagram of a three-dimensional structure of a rollable projection screen provided by an embodiment of the present disclosure;

[0041] FIG34 is a schematic structural diagram of the rollable projection screen shown in FIG33 in a rolled-up state;

[0042] FIG35 is a partial enlarged view of the end portion of the rollable projection screen in FIG34;

[0043] FIG36 is a schematic diagram of the three-dimensional structure of a side where a support back plate is located in a rollable projection screen provided by an embodiment of the present disclosure;

[0044] FIG37 is a schematic diagram of the three-dimensional structure of the side where the support back plate is located in another rollable projection screen provided by an embodiment of the present disclosure.

[0045] The reference numerals represent:

[0046] 1. Rollable projection screen; 11. Reflective layer; 12. Functional layer; 121. Damping layer; 1211. Damping material; 1212. Counterweight particles; 1213. Coating material; 122. Flexible variable layer; 1221. First portion; 1222. Second portion; 1223. Third portion; 123. Shape memory functional layer; 13. Fresnel lens layer; 131. Fresnel microstructure; 14. Surface layer; 141. Microlenses; 15. Diffusion layer; 151. Diffusion particles; 16. Coloring layer; 17. Base material layer; 171. Transparent protrusions; 18. Adhesive layer; 2. Projector; 21. Incident light; 22. Outgoing light; 3. Audience; 4. Frame; 20. Optical film; 30. Support backboard. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the present disclosure will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present disclosure more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in the present disclosure are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of the present disclosure. The drawings of the present disclosure are only used to illustrate relative position relationships and do not represent true proportions.

[0048] As shown in FIG1 , the projection device includes a rollable projection screen 1 and a projector 2 . The projector 2 is located on one side of the rollable projection screen 1 and is used to project projection light toward the rollable projection screen 1 .

[0049] When the projection device is in use, the projector 2 can be placed in front of and below the rollable projection screen 1, with the viewer 3 positioned in front of and looking toward the rollable projection screen 1. Projector 2 emits incident light 21 that shines onto the rollable projection screen 1. After being reflected by the rollable projection screen 1, incident light 21 ultimately forms outgoing light 22 that shines toward the viewer 3, while simultaneously forming an image on the rollable projection screen 1.

[0050] Currently, projection screens often have the following technical problems: (1) Under the influence of external wind, the projection screen is prone to shaking, affecting the display effect; (2) The projection screen is difficult to fold and has creases and poor flatness after unfolding, which affects the projection effect and thus affects the audience's viewing experience.

[0051] To address the above technical issues, embodiments of the present disclosure provide a rollable projection screen 1. As shown in FIG2 , rollable projection screen 1 comprises a reflective layer 11 and at least one functional layer 12. Reflective layer 11 is configured to reflect light, and at least one functional layer 12 is stacked on one or both sides of reflective layer 11. At least one of the functional layers 12 has a damping characteristic that converts vibrations of rollable projection screen 1 into potential energy of the damping characteristic.

[0052] The rollable projection screen 1 provided in the disclosed embodiments features improvements to at least one of the at least one functional layer 12, resulting in damping characteristics in the improved functional layer 12. By providing the damping functional layer 12, when the rollable projection screen 1 is subjected to external forces, the external forces are transferred and applied to the damping functional layer 12. In the disclosed embodiments, the damping functional layer 12 is referred to as the damping layer 121. The friction and relative displacement within the damping layer 121 dissipate the external forces, thereby reducing the jitter of the rollable projection screen 1 and ensuring a good display quality.

[0053] It can be seen that by making the functional layer 12 have damping characteristics, the technical problem that the projection screen is prone to shaking under the action of external wind force and thus affects the display effect can be solved.

[0054] In some implementations (1), as shown in FIG2 , the rollable projection screen 1 only has a damping feature, and the functional layer 12 having the damping feature is referred to as a damping layer 121 , and the damping layer 121 is provided as one or more layers.

[0055] In some other implementations (2), as shown in FIG14 , at least one of the functional layers 12 further has at least one of a variable flexibility feature and a shape memory feature. The variable flexibility feature is used to make the flexibility of the rollable projection screen 1 greater at a first region than at a second region; and the shape memory feature is used to allow the rollable projection screen 1 to return from a temporary rolled shape to an initial flat shape under the influence of external conditions.

[0056] By arranging the functional layer 12 with variable flexibility, the first region of the rollable projection screen 1 is more flexible than the second region. When the first region is in the center and the second region is at the side, the center of the projection screen is easier to fold and more easily to recover after unfolding, without creases. Furthermore, the sides of the projection screen are less susceptible to bending, warping, and flanging. This contributes to excellent flatness and ensures a superior display quality.

[0057] By providing a functional layer 12 with shape memory properties, the projection screen can freely switch between a temporary curled shape and an initial flat shape. The temporary curled shape helps reduce transportation space, improve transportation efficiency, and simplify transportation. The initial flat shape prevents the projection screen from bending, warping, and flanging, giving it excellent flatness and ensuring a good display quality. Thus, by providing the functional layer 12 with at least one of flexible and shape memory properties, the problems of the projection screen being difficult to fold and the creases and poor flatness after unfolding can be further resolved, thereby achieving a good projection effect and enhancing the audience's viewing experience.

[0058] In summary, the rollable projection screen 1 provided by the embodiment of the present disclosure can not only reduce the shaking phenomenon of the rollable projection screen 1, but also reduce the creases and poor flatness of the rollable projection screen 1, thereby significantly improving the display effect.

[0059] In implementation (2) of the embodiment of the present disclosure, at least one layer of the functional layer 12 has a damping characteristic, and at least one of a flexible variable characteristic and a shape memory characteristic, which includes but is not limited to the following implementations.

[0060] As an implementation (2.1), the at least one functional layer 12 has a damping characteristic and also has one of a flexible and variable characteristic and a shape memory characteristic. This includes: at least one functional layer 12 in the rollable projection screen 1 has a damping characteristic and at least one functional layer 12 has a flexible and variable characteristic; or at least one functional layer 12 in the rollable projection screen 1 has a damping characteristic and at least one functional layer 12 has a shape memory characteristic.

[0061] As another implementation (2.2), at least one functional layer 12 has damping characteristics, and also has two of flexible and variable characteristics and shape memory characteristics, that is, the rollable projection screen 1 has damping characteristics, flexible and variable characteristics, and shape memory characteristics.

[0062] Based on the above-mentioned implementation method (2.1) and implementation method (2.2), one solution is that at least one of the flexible variable feature and the shape memory feature and the damping feature are independently arranged in different functional layers, which includes: when the rollable projection screen 1 includes a damping feature and a flexible variable feature, the damping feature and the flexible variable feature are respectively arranged in their corresponding different functional layers 12; or, when the rollable projection screen 1 includes a damping feature and a shape memory feature, the damping feature and the shape memory feature are respectively arranged in their corresponding different functional layers 12; or, when the rollable projection screen 1 includes a damping feature, a flexible variable feature and a shape memory feature, the damping feature, the flexible variable feature and the shape memory feature are respectively arranged in their corresponding different functional layers 12.

[0063] Based on the above-mentioned implementation method (2.1) and implementation method (2.2), the damping feature and at least one of the flexible variable feature and the shape memory feature are integrated and arranged in the same functional layer, which includes: when the rollable projection screen 1 includes the damping feature and the flexible variable feature, the damping feature and the flexible variable feature are integrated and arranged in the same functional layer 12; or, when the rollable projection screen 1 includes the damping feature and the shape memory feature, the damping feature and the shape memory feature are integrated and arranged in the same functional layer 12; or, when the rollable projection screen 1 includes the damping feature, the flexible variable feature and the shape memory feature, the damping feature, the flexible variable feature and the shape memory feature are integrated and arranged in the same functional layer 12.

[0064] In some implementations, each of the at least one functional layer 12 in the rollable projection screen 1 has a flexible and variable feature, thereby giving the rollable projection screen 1 a better crease-free and flat effect.

[0065] In the disclosed embodiments, damping characteristics are provided by a damping material system, flexible and variable characteristics are provided by a flexible and variable material system, and shape memory characteristics are provided by a shape memory material system. In some examples, the damping material system, the flexible and variable material system, and the shape memory material system are three different material systems. In other examples, at least two of the damping material system, the flexible and variable material system, and the shape memory material system are integrated into the same material system.

[0066] For example, the damping material system and the flexible variable material system are integrated to form a damping-flexible variable composite material system, thereby simultaneously providing damping characteristics and flexible variable characteristics. Alternatively, the damping material system and the shape memory material system are integrated to form a damping-shape memory composite material system, thereby simultaneously providing damping characteristics and shape memory characteristics. Alternatively, the flexible variable material system and the shape memory material system are integrated to form a flexible variable-shape memory composite material system, thereby simultaneously providing flexible variable characteristics and shape memory characteristics. Alternatively, the damping material system, the flexible variable material system, and the shape memory material system are integrated into the same material system to form a damping-flexible variable-shape memory composite material system, thereby simultaneously providing damping characteristics, flexible variable characteristics, and shape memory characteristics.

[0067] In the embodiment of the present disclosure, the functional layer 12 with damping characteristics is referred to as a damping layer 121 , the functional layer 12 with flexible and variable characteristics is referred to as a flexible and variable layer 122 , and the functional layer 12 with shape memory characteristics is referred to as a shape memory functional layer 123 .

[0068] The following is an illustrative explanation of some implementation methods of the damping layer 121, the flexible variable layer 122 and the shape memory functional layer 123. However, according to the following disclosure, the technical solutions corresponding to each functional layer can be combined to achieve an integrated arrangement of the damping layer 121, and at least one of the flexible variable layer 122 and the shape memory functional layer 123.

[0069] The damping layer 121 provides damping properties through a damping material system. As shown in FIG3 , this damping material system includes damping material 1211. Damping material 1211 is used to convert vibrations of the rollable projection screen 1 into potential energy within the damping material 1211, thereby reducing the wobble of the rollable projection screen 1. Thus, when the rollable projection screen 1 is subjected to an external force, the force is transferred and applied to the functional layer 12 having damping properties.

[0070] Because damping layer 112 includes damping material 1211, friction and displacement within damping material 1211 dissipate external forces, thereby reducing vibration of rollable projection screen 1 and ensuring a good display quality. Furthermore, damping layer 121 allows rollable projection screen 1 to be rolled up, facilitating installation and transportation of rollable projection screen 1.

[0071] In some embodiments, the damping material 1211 may comprise at least one of polyacrylate, polyurethane, epoxy resin, nitrile resin, nitrile rubber, chloroprene rubber, and silicone rubber. The damping material 1211 is an elastic, porous material. When vibrations from the rollable projection screen 1 are transmitted to the material, friction and displacement occur within the material, dissipating the energy of the external force, thereby maintaining the stability of the rollable projection screen 1 when subjected to external forces. Furthermore, the damping material 1211 is flexible, allowing the damping layer 121 to curl, ensuring the rollable projection screen 1 remains in a stable state.

[0072] Damping material 1211 may include one or more of the aforementioned materials. For example, damping material 1211 may include polyacrylate, polyurethane, epoxy resin, nitrile resin, nitrile rubber, chloroprene rubber, or silicone rubber. Alternatively, damping material 1211 may be a mixture of two or more of the aforementioned materials, and the specific material selection may be based on actual conditions.

[0073] In some embodiments, as shown in FIG3 , the damping material system further includes weight particles 1212, which are distributed within damping material 1211 to form damping layer 121. Weight particles 1212 have a greater density than damping material 1211 and are used to increase the gravity of damping layer 121, thereby ensuring that rollable projection screen 1 remains stable under the influence of gravity. As shown in FIG3 , damping material 1211 can serve as the base material of damping layer 121, and weight particles 1212 can serve as an additive material to damping layer 121.

[0074] Because weight particles 1212 are distributed within the damping material 1211, their high density and weight per unit volume contribute to a greater overall mass of the damping layer 121. Consequently, under the influence of gravity, the rollable projection screen 1 requires a significant external force to overcome the weight of the damping layer 121 and cause it to vibrate. This prevents the rollable projection screen 1 from vibrating under external forces, thereby ensuring a consistent display quality.

[0075] Of course, as mentioned above, the damping material 1211 may not include weight particles 1212, and the rollable projection screen 1 may be kept stable by utilizing friction and mutual displacement within the damping material 1211. To ensure the stability of the rollable projection screen 1, a solution in which weight particles 1212 are distributed within the damping material 1211 may be selected.

[0076] In some examples, the weight particles 1212 include metal weight particles. Since metals generally have a higher density and a greater mass per unit volume, distributing the metal weight particles 1212 within the damping material 1211 can provide the damping layer 121 with a greater mass, improving the rollable projection screen 1's ability to resist external forces and making it easier for the rollable projection screen 1 to maintain stability under external forces. Of course, the weight particles 1212 can also be made of a non-metallic material with a higher density.

[0077] Figure 4 shows stress-strain curves for metal and polymer materials, with a and b representing the metal's stress-strain curves, and c and d representing the polymer's stress-strain curves. As shown in Figure 4 , metals have a stronger ability to resist deformation, while polymers have a weaker ability to resist deformation. Damping material 1211 is typically a polymer material, which can dissipate vibration through its own deformation, while metals can resist external forces through their own weight.

[0078] In some embodiments, the metal weight particles may include at least one of aluminum particles, iron particles, copper particles, and silver particles. These metal weight particles have a high density and can effectively increase the weight of the damping layer 121, thereby ensuring that the rollable projection screen 1 remains stable under external forces. Furthermore, these metal materials are widely available and readily available.

[0079] It is understood that the metal weight particles may include one or more of the aforementioned metal particles. For example, the metal weight particles may be aluminum particles, iron particles, copper particles, or silver particles. Alternatively, the metal weight particles may be a mixture of the aforementioned metal particles, and the specific selection may be based on actual conditions.

[0080] In some embodiments, the weight particles 1212 , for example, metal weight particles, may account for 10% to 50% of the mass of the damping layer 121 .

[0081] When the mass proportion of the weight particles 1212 is within the above range, on the one hand, the mass of the damping layer 121 can be larger, and on the other hand, the damping layer 121 can have enough damping material 1211 for friction and mutual displacement to consume the vibration capacity.

[0082] When the weight particles 1212 include metal weight particles, metal can easily scratch other related structures of the rollable projection screen 1. In particular, as shown in FIG2 , when the damping layer 121 is disposed on a side of the reflective layer 11 away from the Fresnel lens layer 13 in the functional layer 12, the metal weight particles may scratch the reflective layer 11.

[0083] In order to solve the above technical problems, as shown in FIG5 , the damping material system further includes a coating material 1213 . The coating material 1213 is coated on the surface of the weight particles 1212 , and the coating material 1213 is similarly soluble in the damping material 1211 .

[0084] For example, the coating material 1213 is coated on the surface of the metal weight particles. In this way, the metal weight particles are wrapped by the coating material 1213, which prevents the metal weight particles from directly contacting other structures and preventing the metal weight particles from scratching other structures of the rollable projection screen 1.

[0085] In order to make the coating material 1213 and the damping material 1211 similarly miscible, the coating material 1213 can be the same as the damping material 1211. In this way, since the coating material 1213 and the damping material 1211 are made of the same material, the metal weight particles wrapped by the coating material 1213 can be better distributed in the damping material 1211.

[0086] Of course, the coating material 1213 may also be a material different from the damping material 1211 but having similar properties to the damping material 1211. In this way, since the coating material 1213 has similar properties to the damping material 1211, it can also ensure that the metal weight particles can be well distributed in the damping material 1211.

[0087] The coating material 1213 can be coated on the surface of the metal weight particles in different ways. For example, the coating material 1213 can be a polymer material, and a coupling agent can be used to couple the coating material 1213 to the surface of the metal weight particles.

[0088] Figure 6 is a schematic diagram of the structure of the rollable projection screen 1 in use. As shown in Figure 6 , when in use, the rollable projection screen 1 is generally provided with frames 4 at the top and bottom edges of the rollable projection screen 1 for support and to secure the rollable projection screen 1. For example, if the rollable projection screen 1 is rectangular, the width of the rollable projection screen 1 corresponds to the vertical direction shown in Figure 6 , meaning that frames 4 are provided along the two long sides of the rollable projection screen 1. As shown in Figure 6 , the frames 4 at the top and bottom edges of the rollable projection screen 1 provide resistance to external wind forces, preventing the top and bottom edges from shaking.

[0089] FIG7 is a schematic diagram of the forces at A, B, and C of the rollable projection screen 1 shown in FIG6 , wherein F1 is the magnitude of the wind force applied to the rollable projection screen 1 , and F2 is the force applied to the rollable projection screen 1 by the frame 4 . As shown in FIG7 , the local force F at A of the rollable projection screen 1 A = F1-F2. The local force F of the rollable projection screen 1 at point B B=F1-aF2, where a is a coefficient. The local force F of the rollable projection screen 1 at point C C =F1. From this we can see that F C >F B >F A .

[0090] It can be seen that the closer to the center of the rollable projection screen 1, the greater the local force on the rollable projection screen 1, and the more likely it is to shake. Therefore, in order to make the rollable projection screen 1 more resistant to wind, in some embodiments, as shown in Figure 2, the functional layer 12 also includes a Fresnel lens layer 13, which is stacked on one side of the reflective layer 11; and at least one damping layer 121 is stacked on at least one of the side of the Fresnel lens layer 13 away from the reflective layer 11 (see Figure 2) and the side of the reflective layer 11 away from the Fresnel lens layer 13 (see Figure 9).

[0091] FIG8 is a schematic diagram of the planar structure of the damping layer 121 provided in an embodiment of the present disclosure. The damping layer 121 can be divided into a first region S1 and a second region S2. The center of the first region S1 coincides with the center of the Fresnel lens layer 13 (FIG. 2). It is understandable that the outer contour shape of the damping layer 121 and the outer contour shape of the Fresnel lens layer 13 (FIG. 2) are generally consistent with the outer contour shape of the rollable projection screen 1 (FIG. 2). The center of the first region S1 coincides with the center of the Fresnel lens layer 13 (FIG. 2), that is, the center of the first region S1 coincides with the center of the rollable projection screen 1 (FIG. 2). The second region S2 is arranged around the first region S1, and the distribution density of the weighted particles 1212 (FIG. 3) in the second region S2 is less than the distribution density of the weighted particles 1212 (FIG. 3) in the first region S1.

[0092] Because the distribution density of weight particles 1212 ( FIG. 3 ) in first region S1 is relatively high, first region S1 is heavier and only under relatively strong external forces can it overcome gravity and cause vibration, thus achieving a good anti-shake effect. Generally, the external forces acting on second region S2 are relatively small, and even a low distribution density of weight particles 1212 ( FIG. 3 ) can achieve a good anti-shake effect.

[0093] The specific range of the first area S1 can be selected according to actual conditions. In some embodiments, as shown in FIG8 , the outer contour of the damping layer 121 is rectangular, the first area S1 is rectangular, the length of the first area S1 is one-third of the length of the damping layer 121, and the width of the first area S1 is one-third of the width of the damping layer 121. That is, the damping layer 121 is evenly divided into nine rectangular areas of equal size, with the first area S1 being a small rectangular area at the center.

[0094] Of course, the first area S1 can also be set in other ways, which can be specifically determined according to the magnitude of the external force applied to each position of the rollable projection screen 1. The area subjected to greater force can be the first area S1, and the distribution density of the weighted particles 1212 is greater. The area subjected to less force can be the second area S2, and the distribution density of the weighted particles 1212 is less.

[0095] In some embodiments, multiple damping layers 121 can be provided. Thus, multiple damping layers 121 can simultaneously resist external vibrations, making the rollable projection screen 1 more resilient to external forces and more stable under wind. For example, two damping layers 121 can be provided, one of which can be positioned on the side of the reflective layer 11 away from the Fresnel lens layer 13, and the other between the coloring layer 16 and the diffusion layer 15 (described below).

[0096] The flexible and variable characteristics of the flexible and variable layer 122 are provided by a flexible and variable material system. In the embodiment of the present disclosure, the flexible and variable layer 122 is provided as at least one layer, for example, one layer, two layers, three layers, or more layers. For example, FIG14 illustrates that all functional layers 12 of the rollable projection screen 1 are designed as flexible and variable layers 122.

[0097] As shown in FIG15 , the flexible variable layer 122 includes at least one first portion 1221 and a plurality of second portions 1222. The first portion 1221 is made of a first flexible material, and the second portion 1222 is made of a second flexible material that is less flexible than the first flexible material.

[0098] Thus, when the rollable projection screen 1 is folded, the first flexible material's greater flexibility makes folding along the first portion 1221 easier and more convenient. When the rollable projection screen 1 is unfolded again, the first flexible material's greater flexibility and resilience prevents creases from forming on the first portion 1221, allowing it to remain flat. Furthermore, because the second flexible material is less flexible than the first, the second portions 1222 on either side are less likely to bend or warp, maintaining a flat surface, thereby enhancing the viewing experience for viewer 3.

[0099] In some examples, as shown in FIG15 , the outer contour of the flexible variable layer 122 is rectangular; along the length direction X of the flexible variable layer 122, a portion of the second portion 1222 is located on one side of at least one first portion 1221, and another portion of the second portion 1222 is located on the other side of at least one first portion 1221. As shown in FIG15 , because the first portion 1221 and the second portion 1222 are distributed along the length direction of the functional layer 12, when folding, the flexible variable layer 122 can be folded along the length direction X, occupying less space after folding.

[0100] It can be understood that the outer contour shape of the flexible variable layer 122 can be consistent with the outer contour shape of the rollable projection screen 1, that is, the outer contour shape of the rollable projection screen 1 is also rectangular, and the size of the rollable projection screen 1 is the size of the flexible variable layer 122.

[0101] As shown in Figure 15, since the multiple second parts 1222 are located on both sides of the first part 1221 along the length direction X, when viewing, the length direction of the functional layer 12 is the horizontal direction of the rollable projection screen 1, and the second parts 1222 are located on both sides of the horizontal direction, which can ensure that the rollable projection screen 1 is not easily distorted on both sides along the horizontal direction, thereby ensuring the display effect of the display picture.

[0102] Of course, in other embodiments, as shown in FIG16 , along the width direction Y of the flexible variable layer 122, a portion of the second portion 1222 is located on one side of the first portion 1221, and another portion of the second portion 1222 is located on the other side of the first portion 1221. In this case, as shown in FIG16 , the first portion 1221 and the second portion 1222 are arranged along the width direction Y of the functional layer 12, and when folded, the flexible variable layer 122 can be folded along the width direction Y.

[0103] In some embodiments, as shown in FIG15 , the outer contours of the first portion 1221 and the second portion 1222 can both be rectangular. There is one first portion 1221 and two second portions 1222. Along the length direction X of the flexible variable layer 122, one second portion 1222 is located on one side of the first portion 1221, and the other second portion 1222 is located on the other side of the first portion 1221.

[0104] Since the outer contours of the first portion 1221 and the second portion 1222 are both rectangular and regular in shape, when manufacturing the flexible variable layer 122 , it is more convenient to divide the positions corresponding to the first portion 1221 and the second portion 1222 , making manufacturing more convenient.

[0105] Furthermore, the flexible variable layer 122 is divided into three sections, resulting in a simple structure and relatively easy production. The second sections 1222, located on either side of the flexible variable layer 122 in the longitudinal direction X, have a lower degree of flexibility, ensuring that the rollable projection screen 1 remains flat and stable during use, while the first section 1221 in the center facilitates folding of the rollable projection screen 1 and prevents creases from forming when unfolded.

[0106] In some embodiments, as shown in FIG15 , along the length direction X of the flexible variable layer 122, the length of the first portion 1221 can be smaller than the length of the second portion 1222. Thus, as shown in FIG15 , since the length of the first portion 1221 is smaller, the majority of the area of ​​the flexible variable layer 122 is the second portion 1222, ensuring that the rollable projection screen 1 remains flat for the most part after being unfolded, making it less likely to curl.

[0107] In some embodiments, along the length direction of the flexible variable layer 122, the length of the first portion 1221 may be greater than or equal to half the length of the second portion 1222. The specific length of the first portion 1221 may be set according to actual needs.

[0108] For example, the length of the first portion 1221 can be half the length of the second portion 1222. Alternatively, the length of the first portion 1221 can be two-thirds the length of the second portion 1222. In this way, the length of the first portion 1221 is not too narrow, and when folding, the folding position can be made at the first portion 1221, making folding easier and less likely to cause creases after unfolding.

[0109] It is understandable that when the length of the first part 1221 is too narrow, the second part 1222 may be folded up during the folding process, and the second part 1222 has low flexibility, is not convenient to fold, and is prone to creases.

[0110] Of course, the flexible variable layer 122 can also be arranged in other ways. As shown in Figure 17, the outer contours of the first and second parts 1221 and 1222 are rectangular, and the number of first parts 1221 and second parts 1222 can be two. Along the length of the functional layer 12, one second part 1222 is located on one side of the two first parts 1221, and the other second part 1222 is located on the other side of the two first parts 1221. Furthermore, as shown in Figure 17, the flexible variable layer 122 also includes a third part 1223. The outer contour of the third part 1223 is also rectangular. Along the length of the flexible variable layer 122, the third part 1223 is located between the two first parts 1221. The material of the third part 1223 includes a third flexible material, and the flexibility of the third flexible material is less than that of the first flexible material.

[0111] Thus, when folding, the two first parts 1221 can be folded at the positions corresponding to the two first parts 1221, and the folded size is smaller, which can further save transportation space and improve transportation efficiency. In addition, since the third part 1223 is made of the third flexible material with relatively low flexibility, it is not easy to bend and can be kept flat.

[0112] To make the second flexible material less flexible than the first flexible material, in some embodiments, the first flexible material may include UV glue using polyurethane acrylate as a prepolymer, and the second flexible material may include UV glue using epoxy acrylate as a prepolymer.

[0113] Thus, due to the high flexibility of the UV adhesive using polyurethane acrylate as a prepolymer, the first portion 1221 is kept highly flexible, facilitating the rolling of the rollable projection screen 1. The low flexibility of the UV adhesive using epoxy acrylate as a prepolymer can also result in a low flexibility of the second portion 1222, thereby maintaining a flat surface on both sides of the projection screen and preventing distortion or warping. This ensures the flatness of the projection screen and ensures a good viewing experience for the viewer 3.

[0114] Polyurethane acrylate prepolymer monomers and epoxy resin prepolymer monomers can be prepared in different ways. For example, polyurethane acrylate monomers can be prepared by reacting TDI with polyether diol, followed by the addition of hydroxyethyl acrylate. Epoxy resin acrylic acid can be prepared by reacting acrylic acid with bisphenol A epoxy resin.

[0115] Of course, the first flexible material and the second flexible material can also be other materials with different degrees of flexibility, as long as the first portion 1221 has a high degree of flexibility for easy folding, and the second portion 1222 has a low degree of flexibility for better flatness. For example, if the damping layer 121 is designed with a variable flexibility feature, that is, the damping layer 121 also serves as the variable flexibility layer 122, the first flexible material and the second flexible material can each be selected from damping materials 1211 such as polyacrylate, polyurethane, epoxy resin, nitrile resin, nitrile rubber, chloroprene rubber, and silicone rubber, so as to have different degrees of flexibility.

[0116] As shown in FIG17 , when the flexible variable layer 122 includes a third portion 1223, the third flexible material of the third portion 1223 can be the same as the second flexible material. For example, the third flexible material can also include UV adhesive using epoxy acrylate as a prepolymer. This reduces the flexibility of the third portion 1223 and makes it less prone to bending, allowing the rollable projection screen 1 to remain flat.

[0117] When the first flexible material and the second flexible material are UV adhesives, a photoinitiator can be used during the process of manufacturing the flexible variable layer 122. Light is irradiated to the photoinitiator to cause prepolymers in the first flexible material and the second flexible material to undergo polymerization and cross-linking chemical reactions, thereby solidifying the first flexible material and the second flexible material to form the first portion 1221 and the second portion 1222.

[0118] For example, when the first flexible material includes a UV glue with polyurethane acrylate as a prepolymer, MMMP (2-methyl-1-[4-methylmercaptophenyl]-2-morpholinopropanone-1) is used as a photoinitiator and trimethylolpropane triacrylate (TMPTA) is used as a reactive diluent. The first flexible material is irradiated with ultraviolet light with a wavelength of 300 nm. The first flexible material undergoes a polymerization reaction under the action of the MMMP photoinitiator and is cured.

[0119] When the second flexible material includes a UV glue with epoxy acrylate as a prepolymer, HMPP (2-hydroxy-2-methyl-1-phenylpropanone-1) is used as a photoinitiator and TMPTA is used as a reactive diluent. The second flexible material is irradiated with ultraviolet light with a wavelength of 240nm. The second flexible material undergoes a polymerization reaction under the action of the HMPP photoinitiator and is cured.

[0120] During curing, ultraviolet light of a specific wavelength can be used to simultaneously illuminate the first flexible material and the second flexible material, so that the first portion 1221 and the second portion 1222 are cured and formed simultaneously. In this way, since the first portion 1221 and the second portion 1222 are cured simultaneously, the flatness of the functional layer 12 formed after curing can be improved, avoiding the problem of uneven curing and uneven surface of the first portion 1221 and the second portion 1222 when curing the first portion 1221 and the second portion 1222 separately.

[0121] In the embodiment of the present disclosure, the functional layer 12 having shape memory characteristics is referred to as a shape memory functional layer 123 . The shape memory functional layer 123 is provided as at least one layer, including one layer, two layers, three layers, etc. FIG31 illustrates that a rollable projection screen includes a shape memory functional layer 123 .

[0122] The shape memory functional layer 123 has an initial flat shape, and the initial flat shape is a flat layered structure; the shape memory functional layer 123 is used to curl to a temporary curled shape under the influence of external conditions; the shape memory functional layer 123 is also used to restore from a temporary curled shape to the initial flat shape under the influence of external conditions.

[0123] In this way, during the transportation of the rollable projection screen 1, the shape memory function layer 123 can be rolled into a temporary shape by applying certain external conditions to the shape memory function layer 123, thereby reducing the transportation space of the rollable projection screen 1, improving transportation efficiency, and making transportation more convenient.

[0124] When the rollable projection screen 1 is in use, the shape-memory functional layer 123 can be restored to its original shape by applying certain external conditions to it. Because the initial shape is a flat layered structure, there is no risk of curling or warping. This ensures that the stacked multi-layered functional layer 12 has good flatness, resulting in a smooth overall rollable projection screen 1, ensuring a good display quality for the projected image and enhancing the viewing experience for the audience 3.

[0125] It is understandable that there may be a variety of external conditions applied to the shape memory functional layer 123. For example, when the shape memory functional layer 123 needs to be curled, the shape memory functional layer 123 may be deformed by electrical, optical, and thermal conditions, and then curled and fixed to a temporary shape under the action of an external force. The external conditions are then removed so that the shape memory functional layer 123 can maintain the temporary shape.

[0126] When the shape memory function layer 123 needs to recover its original shape, electrical, optical, thermal and other conditions are applied to the shape memory function layer 123 in the temporary shape so that the shape memory function layer 123 can recover its original shape.

[0127] In order to achieve a better projection effect, in some embodiments, referring to FIG31 , at least one functional layer 12 may further include a Fresnel lens layer 13 , which is stacked on one side of the reflective layer 11 , and a surface of the Fresnel lens layer 13 close to the reflective layer 11 has a Fresnel microstructure 131 .

[0128] When the rollable projection screen 1 is in use, the Fresnel lens layer 13 is located on the side of the reflective layer 11 close to the audience 3. In this way, the light projected by the projector 2 first passes through the Fresnel lens layer 13 before reaching the reflective layer 11.

[0129] When ambient light passes through the Fresnel microstructures 131, some of the light is reflected toward areas not visible to the human eye, thus providing the rollable projection screen 1 with a certain degree of ambient light immunity. Furthermore, the Fresnel microstructures 131 converge light. After being reflected by the reflective layer 11, the light projected by the projector 2 converges toward the center of the rollable projection screen 1, allowing the viewer 3 to view a brighter image directly facing the rollable projection screen 1, resulting in a higher gain for the rollable projection screen 1.

[0130] As shown in FIG31 , the shape memory functional layer 123 can be located on the side of the Fresnel lens layer 13 away from the reflective layer 11. As shown in FIG32 , the shape memory functional layer 123 can be located on the side of the reflective layer 11 away from the Fresnel lens layer 13 and adhered to the surface of the reflective layer 11 away from the Fresnel lens layer 13.

[0131] In conjunction with the solution shown in FIG32 , the shape-memory functional layer 123 located on the side of the reflective layer 11 away from the Fresnel lens layer 13 can serve as a support structure, supporting and securing the reflective layer 11 and other functional layers 12, such as the Fresnel lens layer 13. Furthermore, because the shape-memory functional layer 123 is located on the side of the reflective layer 11 away from the Fresnel lens layer 13, light that reaches the reflective layer 11 is reflected by the reflective layer 11 and re-emitted from the side where the Fresnel lens layer 13 is located, without passing through the shape-memory functional layer 123. This prevents the shape-memory functional layer 123 from affecting the light projected by the projector 2.

[0132] When a shape memory function layer 123 is provided on the side of the reflective layer 11 away from the Fresnel lens layer 13, as shown in Figure 33, Figure 33 is a schematic diagram of the three-dimensional structure of a rollable projection screen 1 provided in an embodiment of the present disclosure. The rollable projection screen 1 can be divided into two parts: an optical film 20 and a supporting back panel 30. The optical film 20 is provided on one side of the supporting back panel 30.

[0133] It can be understood that the supporting back plate 30 is the shape memory functional layer 123 shown in FIG32 , and the optical film 20 is the remaining multi-layer functional layer 12 shown in FIG32 .

[0134] Based on this, when manufacturing the rollable projection screen 1, the support backing plate 30 can be manufactured separately, and then the optical film 20 can be bonded to the support backing plate 30 after it is manufactured. During transportation of the rollable projection screen 1, external conditions are applied to the support backing plate 30, causing the support backing plate 30 to curl, thereby causing the rollable projection screen 1 to curl up as a whole. At this point, as shown in Figure 34, which is a schematic diagram of the rollable projection screen 1 shown in Figure 33 in a rolled-up state, the rollable projection screen 1 can be rolled up into a cylindrical structure, taking up less space and making transportation more convenient.

[0135] When rolled up, the support back plate 30 can be rolled toward the direction close to the optical film 20. In this way, as shown in FIG35 , which is a partial enlarged view of the end of the rollable projection screen 1 in FIG34 , the support back plate 30 can wrap the optical film 20 inside to prevent the optical film 20 from being damaged during transportation.

[0136] In some embodiments, the shape of the shape memory functional layer 123 includes a ring shape or a sheet shape, and the ring-shaped shape memory functional layer 123 is disposed around the periphery of the corresponding surface of the reflective layer 11 .

[0137] As an example, as shown in FIG36 , the shape memory functional layer 123 may be annular, and the shape memory functional layer 123 is arranged around the periphery of the surface of the reflective layer 11 away from the Fresnel lens layer 13 , that is, the supporting back plate 30 is arranged around the periphery of the optical film 20 .

[0138] Because the perimeter of the optical film 20 is in contact with the supporting backing plate 30, when the supporting backing plate 30 is kept flat, the optical film 20 can also remain flat, achieving good flatness. Furthermore, because the supporting backing plate 30 is only provided around the perimeter of the optical film 20, material consumption can be reduced, and the weight of the rollable projection screen 1 can also be reduced.

[0139] Of course, the shape memory functional layer 123 may also be a complete layered structure. For example, as shown in FIG37 , the outer contour of the optical film 20 is a rectangle, and the outer contour of the supporting back plate 30 may also be a rectangle.

[0140] In some embodiments, the sides of the shape-memory functional layer 123 can be flush with the sides of the reflective layer 11. That is, along the vertical direction shown in FIG32 , both sides of the shape-memory functional layer 123 are flush with the sides of the reflective layer 11. In this way, because the sides of the shape-memory functional layer 123 are aligned with the sides of the reflective layer 11, the sides of the rollable projection screen 1 are prevented from warping, ensuring the flatness of the rollable projection screen 1.

[0141] In some embodiments, referring to FIG32 , the thickness of the shape memory functional layer 123 can be 0.5 mm to 2 mm in a direction perpendicular to the surface of the Fresnel lens layer 13 away from the reflective layer 11 (i.e., the left-right direction in FIG32 ). For example, the thickness of the shape memory functional layer 123 can be 0.5 mm, 1 mm, 1.5 mm, or 2 mm, and can be set according to actual conditions. This is merely an example.

[0142] When the thickness of the shape memory functional layer 123 is within the above range, the shape memory functional layer 123 can better play a supporting role, so that the other functional layers 12 can remain flat, thereby ensuring the flatness of the rollable projection screen 1 .

[0143] When the shape memory functional layer 123 is thin, the shape memory functional layer 123 is easily deformed and warped under the force of the other functional layers 12. When the shape memory functional layer 123 is thicker, the weight of the shape memory functional layer 123 increases accordingly, thereby increasing the overall weight of the rollable projection screen 1.

[0144] In other embodiments, as shown in FIG31 , the shape memory functional layer 123 may also be located on the side of the Fresnel lens layer 13 away from the reflective layer 11. In this case, the shape memory functional layer 123 may serve as a substrate for manufacturing the rollable projection screen 1.

[0145] When manufacturing the rollable projection screen 1 , the shape memory functional layer 123 can be used as a substrate for manufacturing other functional layers 12 , and the surface of the shape memory functional layer 123 can be used to manufacture other functional layers 12 .

[0146] Taking the rollable projection screen 1 shown in FIG. 31 as an example, the shape memory functional layer 123 shown in FIG. 31 can be used as a substrate for manufacturing the surface layer 14 and the diffusion layer 15 .

[0147] Exemplarily, the surface layer 14 can be made of UV glue material. When making the surface layer 14, UV glue can be applied on the surface of one side of the shape memory function layer 123, and then the UV glue is cured using a UV light source lamp to complete the production of the surface layer 14.

[0148] Similarly, the diffusion layer 15 can also be made of UV adhesive material. The manufacturing process thereof can refer to the manufacturing process of the surface layer 14 mentioned above, and will not be further described here.

[0149] In some examples, the shape of the shape memory function layer 123 includes a ring shape or a sheet shape, and the ring-shaped shape memory function layer 123 is disposed around a periphery of a corresponding surface of the Fresnel lens layer 13 .

[0150] As shown in FIG31 , since the shape memory functional layer 123 is located on the side of the Fresnel lens layer 13 away from the reflective layer 11 , the shape memory functional layer 123 and other functional layers 12 can together form the optical film 20 shown in FIG33 .

[0151] Since the shape memory functional layer 123 can play a certain supporting role and keep the rollable projection screen 1 flat, the rollable projection screen 1 may only include the optical film 20 shown in FIG. 33 .

[0152] Of course, in other embodiments, multiple shape memory functional layers 123 may be provided. Shape memory functional layers 123 are provided on both the side of the Fresnel lens layer 13 away from the reflective layer 11 and the side of the reflective layer 11 away from the Fresnel lens layer 13. The shape memory functional layer 123 located on the side of the reflective layer 11 away from the Fresnel lens layer 13 is the support backplane 30 shown in FIG. 33 .

[0153] As shown in FIG31 , when a shape-memory functional layer 123 is provided on the side of the Fresnel lens layer 13 away from the reflective layer 11, light projected by the projector 2 will pass through the shape-memory functional layer 123. Therefore, to reduce the impact of the shape-memory functional layer 123 on the light projected by the projector 2, in some embodiments, the material of the shape-memory functional layer 123 may include a shape-memory polymer. As is known, shape-memory polymers can have relatively good light transmittance.

[0154] Therefore, when the light projected by the projector 2 passes through the shape memory function layer 123, since the material of the shape memory function layer 123 includes a shape memory polymer, the light can pass through the shape memory function layer 123 well, thereby ensuring that the light projected by the projector 2 can be reflected into the human eye, ensuring the display effect of the rollable projection screen 1.

[0155] In addition, as shown in FIG31 , the shape memory functional layer 123 made of shape memory polymer is generally translucent. When the external ambient light passes through the shape memory functional layer 123 , part of the ambient light can be absorbed by the shape memory functional layer 123 , and the shape memory functional layer 123 can play a certain role in resisting ambient light.

[0156] 32 , when the shape memory layer 123 is disposed on the side of the reflective layer 11 away from the Fresnel lens layer 13, the light projected by the projector 2 does not pass through the shape memory layer 123 and thus does not affect the light projected by the projector 2. In this case, the shape memory layer 123 may also be made of other materials.

[0157] For example, the material of the shape memory functional layer 123 may include shape memory alloy, shape memory ceramic, or shape memory polymer, as long as a material having shape memory properties is selected.

[0158] In some embodiments, referring to FIG31 , the thickness of the shape memory functional layer 123 is 50 μm to 150 μm, perpendicular to the surface of the Fresnel lens layer 13 facing away from the reflective layer 11. For example, the thickness of the shape memory functional layer 123 can be 50 μm, 100 μm, or 150 μm. The specific thickness can be set based on actual conditions and is provided here for illustrative purposes only.

[0159] From the above, it can be seen that the shape memory function layer 123 will have a certain impact on the light projected by the projector 2. When the thickness of the shape memory function layer 123 is within the above range, it can not only ensure that the shape memory function layer 123 has a good supporting function, but also make the shape memory function layer 123 have less impact on the light projected by the projector 2.

[0160] When the shape memory functional layer 123 is thin, it is more likely to deform under the influence of the other functional layers 12. When the shape memory functional layer 123 is thick, the light projected by the projector 2 is likely to be interfered with by the shape memory functional layer 123 when passing through the shape memory functional layer 123, thereby affecting the display effect.

[0161] In some embodiments, the shape memory polymer includes at least one of radiation-crosslinked polyethylene, polynorbornene, trans-polyisoprene, polyurethane, and polyester. These materials exhibit excellent shape memory properties, maintaining good flatness while also facilitating rollability, thereby reducing shipping space and improving transport efficiency.

[0162] The shape memory polymer may also include other materials with shape memory properties. The shape memory polymer may include one or more of the above materials.

[0163] For example, the shape memory polymer may be radiation cross-linked polyethylene, which is used to form the radiation cross-linked polyethylene shape memory functional layer 123. Alternatively, the shape memory material may include radiation cross-linked polyethylene and polynorbornene, and the shape memory functional layer 123 may be formed from a combination of multiple shape memory polymers.

[0164] In some embodiments, the shape memory polymer may have a photochromic group that is used to change the molecular chain state of the shape memory polymer under light conditions, so that the shape memory functional layer 123 can be rolled into a temporary shape and restored to its original shape.

[0165] The photochromic group of the shape memory polymer can be determined according to the specific type of shape memory polymer. For example, the photochromic group can be cinnamic acid, azobenzene, etc. The photochromic group in the shape memory polymer can sense light and absorb the energy of the light. After absorbing the energy, the photochromic group can cause the molecular chain state of the shape memory polymer to change, thereby causing the shape memory functional layer 123 to curl or return to its original shape. In addition, depending on the type of photochromic group, the type of light required to cause the molecular chain state of the polymer to change can also vary.

[0166] When irradiating the shape-memory functional layer 123, appropriate light can be selected based on actual conditions. Generally, ultraviolet light or infrared light can be used to irradiate the shape-memory functional layer 123. Alternatively, light of a specific wavelength can be used to irradiate the shape-memory functional layer 123. In this way, irradiating the shape-memory functional layer 123 with external light can cause the shape-memory functional layer 123 to curl. After the shape-memory functional layer 123 curls under the action of an external force, the specific external light environment can be removed, allowing the shape-memory functional layer 123 to be fixed in its temporary shape.

[0167] When the rollable projection screen 1 is needed, it is only necessary to apply a certain amount of external light to the shape memory function layer 123. The shape memory function layer 123 can restore to its original shape under the external light environment, ensuring the flatness of the rollable projection screen 1 after it is unfolded.

[0168] Based on the above solution, since the shape memory polymer has a photochromic group, light can be used to curl the shape memory functional layer 123 or restore it to its original shape, which has the advantages of high efficiency, low energy loss and convenient remote control.

[0169] Of course, the shape memory functional layer 123 can also be curled or restored to its original shape under the influence of other external conditions. For example, the shape memory functional layer 123 can also be stimulated to curl or restore to its original shape by electrical or thermal conditions.

[0170] Regarding the reflective layer 11 involved in the embodiments of the present disclosure, to achieve the reflective function of the reflective layer 11, the reflective material in the reflective layer 11 can also be aluminum, silver, or a combination of silver and aluminum. To better reflect light, materials of different shapes can be selected as the material for the reflective layer 11, and can be applied to the Fresnel lens layer 13 by spray printing or vapor deposition.

[0171] Taking aluminum as an example of a reflective material, several different reflective layers 11 provided in the embodiments of the present disclosure are exemplarily described in conjunction with the accompanying drawings.

[0172] In some embodiments, as shown in FIG. 27 , which is a schematic diagram of the structure of a reflective layer 11 provided in an embodiment of the present disclosure, to improve the gain of the rollable projection screen 1 , powdered aluminum powder can be applied to the Fresnel lens layer 13 by spray printing or vapor deposition. Because powdered aluminum powder is finer and less directional, light emitted by the projector 2 is mostly reflected directionally out of the projection screen based on the microstructure of the Fresnel lens layer 13, eliminating scattered light reflections and thus achieving a higher gain for the projection screen.

[0173] Furthermore, when aluminum particles are used as the reflective material, the diameter of the aluminum particles can range from 5 μm to 20 μm. Due to their small diameter, aluminum particles within this range form a dense reflective surface after forming the reflective layer 11. When light strikes this reflective surface, it is able to reflect the light as much as possible, thereby avoiding waste of light energy. Furthermore, when aluminum particles are used as the reflective material, the reflective layer 11 can be made very thin, thereby reducing aluminum material consumption and manufacturing costs.

[0174] In other embodiments, as shown in Figure 28, which is a schematic diagram of the structure of another reflective layer 11 provided in embodiments of the present disclosure, when the reflective material of the reflective layer 11 is aluminum, flaky aluminum powder can also be selected. The flaky aluminum powder is spray-coated on the Fresnel lens layer 13 using a spray-printing method. Because the flaky aluminum powder has a large diameter-to-thickness ratio, it has a strong bonding ability with aluminum and is not easily detached. The diameter-to-thickness ratio of the flaky aluminum powder can range from 40:1 to 100:1.

[0175] In the rollable projection screen 1 provided by the embodiment of the present disclosure, the functional layer 12 can have different structures to process light in different ways. Furthermore, at least one of the multiple functional layers 12 can be designed as the flexible variable layer 122 mentioned above.

[0176] In some examples, in addition to the Fresnel lens layer 13 , the damping layer 121 , and the shape memory functional layer 123 mentioned above, the at least one functional layer 12 involved in the embodiments of the present disclosure may also include: at least one of: a surface layer 14 , a coloring layer 16 , and a diffusion layer 15 .

[0177] Illustratively, at least one of the Fresnel lens layer 13 , the damping layer 121 , the surface layer 14 , the diffusion layer 15 , and the coloring layer 16 is also designed as the flexible variable layer 122 . For example, all six of the above layers can be designed as the flexible variable layer 122 .

[0178] In some examples, the Fresnel lens layer 13 , the surface layer 14 , the diffusion layer 15 , and the coloring layer 16 mentioned herein may be arranged independently of the damping layer 121 and the shape memory function layer 123 mentioned above.

[0179] The following describes the structural arrangements and functions of the Fresnel lens layer 13 , the surface layer 14 , the diffusion layer 15 , and the coloring layer 16 .

[0180] The functional layer 12 having the Fresnel microstructure 131 is called a Fresnel lens layer 13 . Exemplarily, as shown in FIG. 14 , the reflective layer 11 is stacked on the surface of the Fresnel lens layer 13 having the Fresnel microstructure 131 .

[0181] Light projected by projector 2 passes through Fresnel lens layer 13 before reaching reflective layer 11. When ambient light passes through Fresnel microstructures 131, some of the light is reflected toward areas not visible to the human eye, thus providing the rollable projection screen 1 with a certain degree of ambient light immunity. Furthermore, the Fresnel microstructures 131 act as light convergents. After being reflected by reflective layer 11, light projected by projector 2 converges toward the center of the rollable projection screen 1, resulting in a brighter image viewed by viewer 3 facing the rollable projection screen 1. This results in a higher gain for the rollable projection screen 1.

[0182] As shown in FIG14 , the surface layer 14 may be laminated on a side of the Fresnel lens layer 13 away from the reflective layer 11 . The surface layer 14 may be used to protect the rollable projection screen 1 and prevent the rollable projection screen 1 from being damaged.

[0183] The surface layer 14 may have different structures. In the following, several different surface layers 14 provided in the embodiments of the present disclosure are exemplarily described with reference to the accompanying drawings.

[0184] Figure 26 is a schematic diagram of the structure of a Fresnel lens layer 13 provided in an embodiment of the present application. Microlenses 141 are provided on the surface of the Fresnel lens layer 13 on the side where the Fresnel microstructures 131 are located. Microlenses 141 diffuse light, thereby increasing the viewing angle of the projection screen. Furthermore, the diffused light reduces coherence, thereby reducing the severity of speckle on the projection screen.

[0185] As shown in FIG21 , in some embodiments, microlenses 141 are distributed on the surface of the surface layer 14 away from the Fresnel lens layer 13. The provision of microlenses 141 creates an uneven surface layer 14, thereby increasing the viewing angle of the rollable projection screen 1 while also reducing the surface reflectivity and improving the utilization of light projected by the projector 2. The microlenses 141 may be hemispherical in shape.

[0186] Referring to Figure 22 , FIG22 is a schematic diagram of the structure of the microlenses 141 of the surface layer 14 after atomization. In some embodiments, the surface of the microlenses 141 can be atomized. Atomizing the surface of the microlenses 141 can further increase the surface roughness, thereby further reducing the reflectivity of light on the surface, thereby increasing the light transmittance, thereby improving the utilization efficiency of the light projected by the projector 2, ensuring a gain effect, and reducing the probability of light reflecting elsewhere to form a clear image.

[0187] As shown in FIG19 , in some embodiments, the surface of the surface layer 14 away from the Fresnel lens layer 13 can be a matte surface, which has a low light reflectivity. As a result, when the light projected by the projector 2 reaches this surface, more light will pass through it and enter the interior of the rollable projection screen 1, improving the utilization rate of the light projected by the projector 2, ensuring the gain of the rollable projection screen 1, and making it difficult for the light projected by the projector 2 to form a clear image in other places (such as the ceiling), thereby ensuring the viewing experience of the audience 3.

[0188] As shown in FIG19 , since the surface layer 14 is a misted, uneven surface, light is scattered upon reaching the surface layer 14, thereby improving the viewing angle of the rollable projection screen 1. The surface of the surface layer 14 facing away from the Fresnel lens layer 13 can be sandblasted to form a misted surface, which is simple, convenient, and easy to implement.

[0189] As shown in Figure 20, Figure 20 is a structural schematic diagram of a surface layer 14 provided in an embodiment of the present disclosure. Diffusion particles 151 are distributed on the surface layer 14. When light passes through the diffusion particles 151 in the surface layer 14, it will also diffuse, thereby increasing the viewing angle and reducing the degree of interference between light.

[0190] As shown in FIG2 or FIG14 , the colored layer 16 can be located between the surface layer 14 and the Fresnel lens layer 13. A dark dye is distributed within the colored layer 16. When ambient light passes through the colored layer 16, it is absorbed by the dark dye within the colored layer 16, thereby providing the rollable projection screen 1 with improved resistance to ambient light.

[0191] The dark dye can be selected based on actual conditions. For example, the dark dye can be an azo dye. Of course, the dark dye can also be placed in other locations. As shown in FIG19 , in some embodiments, the reflective layer 11 may also be provided with a dark dye. This allows light to be absorbed by the dark dye as it passes through the reflective layer 11, thereby providing the rollable projection screen 1 with improved resistance to ambient light. Furthermore, since light only passes through the reflective layer 11 once, the proportion of light projected by the projector 2 absorbed by the dark dye is reduced, thereby improving light utilization.

[0192] Continuing with Figure 2 or Figure 14 , in some embodiments, a diffusion layer 15 can be located between the surface layer 14 and the Fresnel lens layer 13. Diffusion particles 151 are distributed within the diffusion layer 15. When light passes through the diffusion particles 151 within the diffusion layer 15, it diffuses, thereby increasing the viewing angle of the rollable projection screen 1. Furthermore, due to the diffusion of light, the coherence between the diffused light rays is reduced, thereby reducing the severity of speckle formed on the surface of the rollable projection screen 1.

[0193] The material of the diffusion particles 151 may be polymethyl methacrylate (PMMA).

[0194] Of course, the diffusion particles 151 can also be placed in other locations. As shown in FIG18 , the reflective layer 11 can be provided with diffusion particles 151. When light from the projector 2 passes through the reflective layer 11, it passes through the diffusion particles 151 within the reflective layer 11 and is diffused in all directions by the diffusion particles 151, thereby increasing the viewing angle of the rollable projection screen 1.

[0195] When the diffusion particles 151 are disposed on the reflective layer 11 , there is no need to provide a separate diffusion layer 15 ( FIG. 18 ), thereby reducing the thickness of the rollable projection screen 1 and meeting the thickness requirements of users.

[0196] The materials of the coloring layer 16 and the diffusion layer 15 can be selected according to actual conditions. For example, the base material of the coloring layer 16 and the diffusion layer 15 can be made of polyethylene terephthalate (PET).

[0197] In combination with the arrangement of the coloring layer 16 and the diffusion layer 15 , the arrangement position of the damping layer 121 is further exemplified.

[0198] As shown in Figure 2, the coloring layer 16 and the diffusion layer 15 are stacked and located on the side of the Fresnel lens layer 13 away from the reflective layer 11. Furthermore, the damping layer 121 is located on the side of the reflective layer 11 away from the Fresnel lens layer 13. In this configuration, the damping layer 121 is less likely to interfere with the light projected by the projector 2, ensuring a good display quality. The damping layer 121 can be applied by spraying, printing, or adhesively bonding on the side of the reflective layer 11 away from the Fresnel lens layer 13.

[0199] As shown in FIG9 , the damping layer 121 can also be located on the side of the Fresnel lens layer 13 away from the reflective layer 11, and the damping layer 121 can be located between the diffusion layer 15 and the coloring layer 16. In this case, when light passes through the damping layer 121, it will be refracted due to the difference in refractive index, causing the light to diffuse, thereby expanding the viewing angle.

[0200] Of course, the damping layer 121 may also be located at other positions. For example, the damping layer 121 may also be located between the diffusion layer 15 and the Fresnel lens layer 13 , or between the colored layer 16 and the surface layer 14 .

[0201] Based on the solution shown in Figure 9, the damping material 1211 can be made of a material with high transmittance, such as the aforementioned polyacrylate, polyurethane, epoxy resin, nitrile resin, nitrile rubber, chloroprene rubber and silicone rubber, to ensure that light can pass through the damping layer 121 smoothly.

[0202] As shown in FIG18 , the at least one functional layer 12 may further include a substrate layer 17 , which may be located between the surface layer 14 and the Fresnel lens layer 13 . The substrate layer 17 may serve as a supporting base for the rollable projection screen 1 .

[0203] The number of substrate layers 17 can be adjusted based on practical needs. For example, using the rollable projection screen 1 shown in FIG18 as an example, the rollable projection screen 1 can include two substrate layers 17, which serve as the foundation for forming the surface layer 14 and the Fresnel lens layer 13. When forming the surface layer 14, UV adhesive can be applied to the surface of the substrate layer 17 facing away from the Fresnel lens layer 13. The UV adhesive can then be cured using a UV light source to complete the surface layer 14.

[0204] As shown in FIG18 , at least one functional layer 12 may further include an adhesive layer 18. The adhesive layer 18 is located between the plurality of substrate layers 17 and may be used to bond two substrate layers 17. The two substrate layers 17 are bonded together via the adhesive layer 18.

[0205] When forming adhesive layer 18, the surface of one of substrate layers 17 can be used as a base to form adhesive layer 18. As shown in FIG19 , a single substrate layer 17 can be provided. This substrate layer 17 can be positioned between Fresnel lens layer 13 and surface layer 14, serving as a base for forming Fresnel lens layer 13 and surface layer 14.

[0206] 23 , the coloring layer 16 may be disposed between two substrate layers 17 . Both sides of the coloring layer 16 may be bonded together by adhesive layers 18 .

[0207] In some embodiments, referring to FIG. 24 , FIG. 24 is a schematic diagram illustrating the structure of another rollable projection screen 1 provided in embodiments of the present disclosure. FIG. 24 illustrates a rollable projection screen 1 having two substrate layers 17 . These two substrate layers 17 are positioned between the Fresnel lens layer 13 and the surface layer 14 . The substrate layer 17 adjacent to the surface layer 14 is provided with a light-transmitting protrusion 171 on the side facing away from the surface layer 14.

[0208] When light passes through the light-transmitting protrusions 171, the light is diffused, thereby increasing the viewing angle of the rollable projection screen 1. At the same time, due to the diffusion of light, the coherence between the light rays is reduced, thereby reducing the severity of the speckle formed on the rollable projection screen 1.

[0209] The light-transmitting protrusion 171 may be a cylindrical lens. Referring to FIG. 24 , the cross section of the light-transmitting protrusion 171 along a plane perpendicular to its extending direction may be semicircular, that is, the light-transmitting protrusion 171 is semi-cylindrical.

[0210] In some embodiments, referring to Figure 25, two surfaces of the two substrate layers 17 that are close to each other are both provided with light-transmitting protrusions 171. Similarly, the shape of the light-transmitting protrusions 171 can also be semi-cylindrical.

[0211] For example, the extending directions of the light-transmitting protrusions 171 on the two substrate layers 17 may be perpendicular to each other. Generally, the rollable projection screen 1 is generally rectangular.

[0212] Referring to Figure 25 , the vertical direction in Figure 25 represents the width of the rollable projection screen 1, which is the vertical direction viewed by the viewer 3. The direction perpendicular to the plane shown in Figure 25 represents the length of the rollable projection screen 1, which is the horizontal direction viewed by the viewer 3. Thus, the light-transmitting protrusions 171 on the left substrate layer 17 extend along the length of the rollable projection screen 1. Thus, when light passes through these light-transmitting protrusions 171, the light diffuses along the width of the rollable projection screen 1, thereby increasing the vertical viewing angle of the rollable projection screen 1. The light-transmitting protrusions 171 on the right substrate layer 17 extend along the width of the rollable projection screen 1.

[0213] In this way, light passing through the light-transmitting protrusions 171 will diffuse along the length direction of the rollable projection screen 1, thereby increasing the viewing angle of the rollable projection screen 1 in the horizontal direction.

[0214] The substrate layer 17 can also be made of different materials. For example, the substrate layer 17 can be made of polyethylene terephthalate (PET). PET is flexible, which makes the substrate layer 17 flexible and able to be rolled.

[0215] Of course, the substrate layer 17 may also be made of other flexible materials. For example, the substrate layer 17 may be made of thermoplastic polyurethane (TPU) material. TPU is elastic and can be curled.

[0216] Alternatively, the substrate layer 17 can also be made of a flexible material such as Styrenic Block Copolymers (SBC). TPU has a wide range of hardness, and increasing the hardness can still maintain good elasticity and wear resistance, and has good oil resistance, aging resistance, and wear resistance, and is relatively low in cost.

[0217] SBC material is flexible and possesses excellent mechanical properties, including water resistance and high tensile, tear, and ball burst strength. It also exhibits excellent resistance to oxidation, water, weathering, chemicals, and corrosion. Its rough, three-dimensional mesh structure on the underside provides excellent bonding strength with a variety of adhesives and can be blended with other materials to improve its performance and strength.

[0218] For another example, the substrate layer 17 may also be made of flexible materials such as polyurethane (PU), polyethylene (PE), polyvinyl chloride (PVC), and polypropylene (PP).

[0219] PU material can adapt to substrates with different thermal expansion coefficients, forming a soft-hard transition layer with the substrate and providing strong adhesion. This allows for better integration with other layered structures in the projection screen and provides excellent cushioning and shock absorption. PE material is odorless, non-toxic, and has a waxy feel. It offers excellent low-temperature resistance, good chemical stability, and resistance to most acids and bases. It is insoluble in common solvents at room temperature, has low water absorption, and provides excellent circuit insulation. PVC material offers excellent dimensional stability, weather resistance, and low cost. Furthermore, the hardness of PVC can be adjusted using plasticizers. PP material is easily dyed, lightweight, tough, and resistant to heat and chemicals.

[0220] On the other hand, an embodiment of the present disclosure also provides a method for preparing any of the above-mentioned rollable projection screens, wherein the method for preparing the rollable projection screen includes: separately preparing a reflective layer 11 and at least one functional layer 12; wherein, preparing at least one functional layer 12 includes: applying damping characteristics to one or more of the at least one functional layer 12.

[0221] In some examples, the functional layer 12 of the rollable projection screen 1 includes a damping layer 121. Accordingly, the method for preparing the rollable projection screen 1 may be as follows: As shown in FIG10 , the method includes steps S100 to S300.

[0222] S100: Producing the Fresnel lens layer 13. For example, taking the rollable projection screen 1 shown in FIG. 2 as an example, when producing the Fresnel lens layer 13, the diffusion layer 15 can be used as a base for producing the Fresnel lens layer 13, and the Fresnel lens layer 13 is produced on the surface of one side of the diffusion layer 15. The Fresnel lens layer 13 can be cured with UV glue to form the Fresnel lens layer 13. Because the UV glue is elastic, the Fresnel lens layer 13 can be rolled. When producing the Fresnel lens layer 13, the UV glue can be applied to the surface of one side of the diffusion layer 15, and then the UV glue is embossed with a dedicated mold to form the Fresnel lens layer 13. The UV glue is then cured with a UV light source lamp, and finally the Fresnel lens layer 13 is produced by demolding.

[0223] S200: forming a reflective layer 11 on one side of the Fresnel lens layer 13. For example, referring to FIG2 , when forming the reflective layer 11, a reflective material may be coated on the surface of the Fresnel lens layer 13 having the Fresnel microstructure 131 by spray printing or evaporation.

[0224] S300 : forming a damping layer 121 on at least one of a side of the Fresnel lens layer 13 away from the reflective layer 11 and a side of the reflective layer 11 away from the Fresnel lens layer 13 .

[0225] Continuing with Figure 2 , illustratively, when fabricating the damping layer 121, it can be sprayed, printed, or bonded onto the surface of the reflective layer 11 facing away from the Fresnel lens layer 13. Because the damping layer 121 comprises a damping material 1211, friction and displacement within the damping material 1211 dissipate external forces, thereby reducing the jitter of the rollable projection screen 1 and ensuring a good display quality. Furthermore, the damping layer 121 allows the rollable projection screen 1 to be rolled up, facilitating its installation and transportation.

[0226] As shown in FIG11 , a damping layer 121 is formed on at least one of a side of the Fresnel lens layer 13 away from the reflective layer 11 and a side of the reflective layer 11 away from the Fresnel lens layer 13 , which includes steps S310 - S320 .

[0227] S310: distributing the weight particles 1212 in the damping material 1211 to form a mixed material. For example, the weight particles 1212 can be directly added to the damping material 1211 and then blended and stirred to form the mixed material.

[0228] S320 : using a mixed material to form a damping layer 121 on at least one of a side of the Fresnel lens layer 13 away from the reflective layer 11 and a side of the reflective layer 11 away from the Fresnel lens layer 13 .

[0229] Since the damping material 1211 is distributed with weight particles 1212 and has a high density, the mass of the damping layer 121 is large, and the rollable projection screen 1 requires a large external force to overcome the gravity of the damping layer 121 and vibrate, and the rollable projection screen 1 has a good anti-vibration capability.

[0230] As shown in FIG. 12 , distributing the weight particles 1212 in the damping material 1211 to form a mixed material includes steps S311 - S312 .

[0231] S311 : distributing the weight particles 1212 in the damping material 1211 to form a first mixed material.

[0232] S312: distributing the weight particles 1212 in the damping material 1211 to form a second mixed material, wherein the distribution density of the weight particles 1212 in the first mixed material is greater than the distribution density of the weight particles 1212 in the second mixed material.

[0233] As shown in FIG13 , a damping layer 121 is formed using a mixed material at at least one of a side of the Fresnel lens layer 13 away from the reflective layer 11 and a side of the reflective layer 11 away from the Fresnel lens layer 13 , including steps S321 - S322 .

[0234] S321: Using the first mixed material, a portion of the damping layer 121 is formed to form a first region at at least one of a side of the Fresnel lens layer 13 away from the reflective layer 11 and a side of the reflective layer 11 away from the Fresnel lens layer 13. The center of the first region coincides with the center of the Fresnel lens layer 13.

[0235] For example, referring to FIG2 , a damping layer 121 is provided on the surface of the reflective layer 11 away from the Fresnel lens layer 13. When forming the damping layer 121, a portion of the damping layer 121 can be formed by spraying, printing, or bonding at a corresponding position on the surface of the reflective layer 11 away from the Fresnel lens layer 13 to form a first region.

[0236] S322: Using the second mixed material to form another portion of the damping layer 121 around the first region to form a second region.

[0237] Exemplarily, referring to FIG. 2 , another portion of the damping layer 121 is formed at a corresponding position on the surface of the reflective layer 11 away from the Fresnel lens layer 13 by spraying, printing or bonding to form the first region.

[0238] By using different mixed materials at different positions of the rollable projection screen 1 to produce the damping layer 121 with different distribution densities of the weight particles 1212 , the ability of each position to resist external forces can be made different.

[0239] Since the distribution density of the weight particles 1212 in the first region is relatively high, the ability to resist external forces is relatively low, and a relatively large external force is required to cause the rollable projection screen 1 to shake. Since the second region is located at the periphery, the rollable projection screen 1 is generally provided with a frame 4 when in use. The frame 4 can prevent the periphery from shaking. The relatively low distribution density of the weight particles 1212 in the second region can also prevent the periphery of the rollable projection screen 1 from shaking.

[0240] In some implementations, the method for preparing the rollable projection screen includes applying at least one of a flexible variable feature and a shape memory feature to one or more of the at least one functional layer 12 .

[0241] In some examples, the functional layer 12 of the rollable projection screen 1 includes a flexible variable layer 122 . Accordingly, the method for preparing the rollable projection screen 1 may be as follows.

[0242] As shown in FIG. 29 , the preparation method includes steps S400 to S500 .

[0243] S400: Fabricate at least one functional layer 12. For example, as shown in FIG18 , when the rollable projection screen 1 includes a substrate layer 17 , the substrate layer 17 can serve as a base, and the functional layer 12 can be fabricated on the surface of the substrate layer 17 . The rollable projection screen 1 shown in FIG18 has two substrate layers 17 : the right substrate layer 17 can serve as a base for fabricating the Fresnel lens layer 13 , and the left substrate layer 17 can serve as a base for fabricating the surface layer 14 . Furthermore, both substrate layers 17 can serve as bases for fabricating the adhesive layer 18 .

[0244] When the number of the functional layers 12 is large, the functional layers 12 can be manufactured using the manufactured functional layers 12 as a base.

[0245] As shown in FIG14 , when manufacturing the functional layer 12 , the diffusion layer 15 can be manufactured first, and then the Fresnel lens layer 13 and the coloring layer 16 are manufactured using the diffusion layer 15 as a base. The surface layer 14 is then manufactured using the coloring layer 16 as a base.

[0246] S500 : forming a reflective layer 11 on one side of at least one functional layer 12 .

[0247] For example, as shown in FIG14 , when manufacturing the reflective layer 11 , the reflective layer 11 can be manufactured on the surface of the Fresnel lens layer 13 on the side having the Fresnel microstructure 131 , and the material for manufacturing the reflective layer 11 is sprayed onto the Fresnel lens layer 13 by spray printing to form the reflective layer 11 .

[0248] When the first flexible material includes UV glue with polyurethane acrylate as a prepolymer and the second flexible material includes UV glue with epoxy acrylate as a prepolymer, as shown in Figure 30, manufacturing at least one functional layer 12 includes: S510: coating the first flexible material on the surface of the substrate to form a first part 1221.

[0249] 15 , when forming the functional layer 12, a first flexible material is first coated on the substrate surface to form the first portion 1221. The substrate surface can be the surface of the base material layer 17 ( FIG. 18 ) or the surface of the already formed functional layer 12 ( FIG. 18 ).

[0250] S520 : Coating a second flexible material on both sides of the first portion 1221 in the substrate surface to form a plurality of second portions 1222 .

[0251] 15 , the outer contours of the first portion 1221 and the second portion 1222 are shown. Along the length direction of the functional layer 12 , the second flexible material may be coated on both sides of the first portion 1221 to form the second portion 1222 .

[0252] S530: The first flexible material and the second flexible material are irradiated with a UV light source to cure the first and second flexible materials. When curing the first portion 1221 and the second portion 1222, ultraviolet rays of different wavelengths can be used to simultaneously irradiate the first and second flexible materials. This simultaneous irradiation allows the first and second flexible materials to cure simultaneously, resulting in a smoother functional layer 12 formed after curing, and less prone to uneven curing.

[0253] On the other hand, an embodiment of the present disclosure further provides a projection device, as shown in Figure 1, the projection device includes: a projector 2 and any of the above-mentioned rollable projection screens 1; the projector 2 is located on one side of the rollable projection screen 1, and is used to project projection light toward the rollable projection screen 1.

[0254] The projection device provided by the embodiments of the present disclosure has the advantages of any of the above-mentioned rollable projection screens 1 .

[0255] The projector 2 shown in FIG1 may include a laser, which may be a monochromatic laser, a two-color laser, or a three-color laser. The three-color laser may emit a blue laser, a red laser, and a green laser. The wavelength of the blue laser emitted by the laser may be set to a range of 430 nm to 460 nm, the wavelength of the green laser emitted may be set to a range of 400 nm to 540 nm, and the wavelength of the red laser emitted may be set to a range of 610 nm to 640 nm. Of course, the projector 2 may also be a projector 2 that emits ordinary light.

[0256] Since three-color lasers have the advantages of color fidelity and a wide color gamut, the lasers in the projector 2 provided in the embodiment of the present disclosure can be three-color lasers. Of course, the lasers in the projector 2 provided in the embodiment of the present disclosure can also be single-color lasers or two-color lasers.

[0257] The above descriptions are merely some exemplary embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A rollable projection screen, wherein: The rollable projection screen comprises: a reflective layer, the reflective layer being used to reflect light; At least one functional layer, wherein the at least one functional layer is stacked and arranged on one side or both sides of the reflective layer; At least one of the functional layers has a damping feature for converting vibration of the rollable projection screen into potential energy of the damping feature.

2. The rollable projection screen according to claim 1, wherein: At least one of the functional layers further has at least one of a flexible variable characteristic and a shape memory characteristic; The variable flexibility feature is used to make the flexibility of the rollable projection screen greater at a first area than at a second area; The shape memory feature is used to enable the rollable projection screen to recover from a temporary rolled shape to an initial flat shape under the influence of external conditions.

3. The rollable projection screen according to claim 2, wherein: The damping feature and at least one of the flexible variable feature and the shape memory feature are independently arranged in different functional layers; Alternatively, the damping feature is integrated with at least one of the flexible variable feature and the shape memory feature and is arranged on the same functional layer.

4. The rollable projection screen according to any one of claims 1 to 3, wherein: The damping feature is provided by a damping material system, which includes a damping material for converting vibration of the rollable projection screen into potential energy inside the damping material to reduce the shaking of the rollable projection screen.

5. The rollable projection screen according to claim 4, wherein: The damping material system further includes weight particles, which are distributed in the damping material and have a density greater than that of the damping material.

6. The rollable projection screen according to claim 5, wherein: The weight particles include metal weight particles.

7. The rollable projection screen according to claim 6, wherein: The damping material system further includes a coating material, which is coated on the surface of the weight particles, and the coating material is similarly soluble in the damping material.

8. The rollable projection screen according to any one of claims 5 to 7, wherein: The functional layer further includes a Fresnel lens layer, which is stacked on one side of the reflective layer; and the functional layer having the damping characteristic is referred to as a damping layer, and at least one damping layer is stacked and arranged on at least one of a side of the Fresnel lens layer away from the reflective layer and a side of the reflective layer away from the Fresnel lens layer; The damping layer is divided into: a first region, wherein a center of the first region coincides with a center of the Fresnel lens layer; as well as, a second area, the second area being arranged around the first area; The distribution density of the weight particles in the second region is smaller than the distribution density of the weight particles in the first region.

9. The rollable projection screen according to any one of claims 4 to 7, wherein: The damping material includes at least one of polyacrylate, polyurethane, epoxy resin, nitrile resin, nitrile rubber, chloroprene rubber and silicone rubber.

10. The rollable projection screen according to any one of claims 2 to 9, wherein: The functional layer having the flexible variable feature is called a flexible variable layer, and the flexible variable layer is provided as at least one layer; The flexible variable layer includes at least one first portion and a plurality of second portions, wherein the plurality of second portions are located on both sides of the at least one first portion; The material of the first portion includes a first flexible material, the material of the second portion includes a second flexible material, and the flexibility of the second flexible material is less than that of the first flexible material.

11. The rollable projection screen of claim 10, wherein: The outer contour of the flexible variable layer is a rectangle; Along the length direction of the flexible variable layer, a portion of the second portion is located on one side of the at least one first portion, and another portion is located on the other side of the at least one first portion. The second portion is located on the other side of the at least one first portion.

12. The rollable projection screen of claim 11, wherein: The outer contours of the first part and the second part are both rectangular; there are two first parts; there are two second parts; along the length direction of the flexible variable layer, one second part is located on one side of the two first parts, and the other second part is located on the other side of the two first parts; The flexible variable layer further comprises: The third part has a rectangular outline; along the length direction of the flexible variable layer, the third part is located between the two first parts; the material of the third part includes a third flexible material, and the flexibility of the third flexible material is less than that of the first flexible material.

13. The rollable projection screen according to any one of claims 10 to 12, wherein: The first flexible material includes UV glue with polyurethane acrylate as a prepolymer; the second flexible material includes UV glue with epoxy acrylate as a prepolymer.

14. The rollable projection screen according to any one of claims 2 to 13, wherein: The functional layer having the shape memory characteristic is called a shape memory functional layer, and the shape memory functional layer is provided as at least one layer; The shape memory functional layer has an initial flat shape, and the initial flat shape is a flat layered structure; the shape memory functional layer is used to curl to a temporary curled shape under the influence of external conditions; the shape memory functional layer is also used to restore from the temporary curled shape to the initial flat shape under the influence of external conditions.

15. The rollable projection screen of claim 14, wherein: The at least one functional layer further comprises: a Fresnel lens layer, wherein the Fresnel lens layer is stacked and arranged on one side of the reflective layer; The shape memory functional layer is located on a side of the reflective layer away from the Fresnel lens layer, and is bonded to a surface of the reflective layer away from the Fresnel lens layer; or, the shape memory functional layer is located on a side of the Fresnel lens layer away from the reflective layer.

16. The rollable projection screen of claim 15, wherein: The thickness of the shape memory function layer is 0.5 mm to 2 mm along a direction perpendicular to the surface of the Fresnel lens layer away from the reflective layer; Alternatively, along a direction perpendicular to a surface of the Fresnel lens layer away from the reflective layer, the thickness of the shape memory function layer is 50 μm to 150 μm.

17. The rollable projection screen of claim 15, wherein: The material of the shape memory functional layer includes shape memory polymer; The shape memory polymer comprises at least one of radiation cross-linked polyethylene, polynorbornene, trans-polyisoprene, polyurethane, and polyester; or, The shape memory polymer has a photochromic group; the photochromic group is used to change the molecular chain state of the shape memory polymer under light conditions, so that the shape memory functional layer can curl to the temporary shape and restore the shape memory functional layer to the original shape.

18. The rollable projection screen according to any one of claims 2 to 17, wherein: The at least one functional layer further comprises: at least one of a Fresnel lens layer, a surface layer, a diffusion layer, and a coloring layer; Wherein, at least one of the Fresnel lens layer, the surface layer, the diffusion layer, and the coloring layer has the flexible variable feature.

19. The method for preparing a rollable projection screen according to any one of claims 1 to 18, wherein: The preparation method comprises: separately preparing a reflective layer and at least one functional layer; Wherein, preparing the at least one functional layer includes: applying damping characteristics to one or more of the at least one functional layer.

20. The method for preparing a rollable projection screen according to claim 19, wherein: The preparation method further includes: applying at least one of a flexible variable feature and a shape memory feature to one or more of the at least one functional layer.

21. A projection device, wherein: The projection device comprises: a projector and a rollable projection screen according to any one of claims 1 to 18; The projector is located at one side of the rollable projection screen and is used for projecting projection light toward the rollable projection screen.

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