Rollable projection screen and projection device

Abstract

The invention discloses a rollable projection screen and a projection device, relates to the technical field of projection display, and is used for solving the problem that the projection screen cannot be recovered to a flat state after being curled and unfolded. The rollable projection screen comprises at least one functional layer and an elastic recovery layer. And at least one functional layer has elasticity. The elastic recovery layer and the at least one functional layer are stacked. Wherein the material of the elastic recovery layer comprises a polyether-amide block copolymer. The polyether-amide block copolymer is used for enabling the elastic recovery layer to generate a shape memory characteristic, so that the rollable projection screen is recovered to a flat state after being curled and unfolded. The method can be used for displaying the projection picture.

Description

Technical Field

[0001] The present application relates to the field of projection display technology, and in particular to a rollable projection screen and a projection device. Background Art

[0002] 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.

[0003] In order to facilitate the transportation of the projection screen, the projection screen can be made of flexible materials. During transportation, the projection screen can be rolled up, saving transportation space and making transportation more convenient.

[0004] However, existing projection screens have the problem of being unable to return to a flat state after being rolled up and then unfolded, which affects the audience's viewing experience. Summary of the Invention

[0005] The present application provides a rollable projection screen and a projection device, which are used to solve the problem that the projection screen cannot be restored to a flat state after being rolled up and then unfolded.

[0006] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0007] In one aspect, embodiments of the present application provide a rollable projection screen comprising at least one functional layer and an elastic recovery layer. The at least one functional layer is elastic and is laminated with the at least one functional layer. The elastic recovery layer is made of a polyether-amide block copolymer. The polyether-amide block copolymer is used to impart shape memory properties to the elastic recovery layer, allowing the rollable projection screen to return to a flat state after being unfolded.

[0008] In the rollable projection screen provided in the embodiment of the present application, the light projected by the projector passes through at least one functional layer or elastic recovery layer and then reaches at least one functional layer. After being reflected by at least one functional layer, the light passes through at least one functional layer or elastic recovery layer again and then is emitted to the audience, so that the audience can watch the picture on the rollable projection screen.

[0009] Because the polyether-amide block copolymer is used to impart shape memory to the elastic recovery layer, the layer retains this shape memory when the rollable projection screen is folded. This allows the screen to return to its flat state when unfolded, enhancing the viewing experience.

[0010] In this way, there is no need to add an additional rigid support structure to solve the deformation problem. The thickness, volume and weight of the rollable projection screen will not increase, and an ultra-thin screen form can be achieved. It can also be used for a rollable lifting screen to meet the different needs of the audience.

[0011] In some embodiments, the polyether-amide block copolymer includes a hard segment and a soft segment. The hard segment is used to increase the stiffness of the elastic recovery layer, allowing the elastic recovery layer to remain flat after curling and then unfolding. The soft segment is used to increase the flexibility of the elastic recovery layer, allowing the elastic recovery layer to curl. The hard segment in the polyether-amide block copolymer accounts for 50%-90%, and the soft segment in the polyether-amide block copolymer accounts for 10%-50%.

[0012] In some embodiments, the rollable projection screen comprises multiple functional layers, wherein the elastic recovery layer is stacked between the multiple functional layers, and the thickness of the elastic recovery layer is 20 μm-50 μm.

[0013] In some embodiments, the hard segment in the polyether-amide block copolymer accounts for 70%, the soft segment in the polyether-amide block copolymer accounts for 30%, and the thickness of the elastic recovery layer is 30 μm.

[0014] In some embodiments, the hard segment in the polyether-amide block copolymer accounts for 60%, and the soft segment in the polyether-amide block copolymer accounts for 40%. The thickness of the elastic recovery layer is 50 μm.

[0015] In some embodiments, the elastic recovery layer is laminated on one side of at least one functional layer, and the thickness of the elastic recovery layer is 10 μm-20 μm.

[0016] In some embodiments, the elastic recovery layer further comprises a modifying material, which is used to modify the polyether-amide block copolymer to improve the light transmittance of the elastic recovery layer.

[0017] In some embodiments, the modified material includes a nucleating agent, which is used to reduce the crystal size of the polyether-amide block copolymer to improve the light transmittance of the elastic recovery layer.

[0018] In some embodiments, the modifying material includes a hydroxyl compound, which is used to cause an esterification reaction to occur in the polyether-amide block copolymer during its formation, thereby modifying the polyether-amide block copolymer.

[0019] In some embodiments, the modifying material includes a methylating agent, which is used to chemically bond with the polyether-amide block copolymer to reduce the crystallinity of the polyether-amide block copolymer, thereby increasing the light transmittance of the elastic recovery layer.

[0020] In another aspect, embodiments of the present application provide a projection device comprising any of the aforementioned rollable projection screens and a projector. The projector is located on one side of the rollable projection screen. The projector is configured to emit projection light toward the rollable projection screen. The light projected by the projector passes through the rollable projection screen and is reflected back toward the side of the projector.

[0021] Since the above-mentioned projection device includes any of the above-mentioned rollable projection screens, it can achieve the same technical effects as the above-mentioned rollable projection screen and solve the same technical problems, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0023] Figure 1 Schematic diagram of the structure of the projection screen in different states of the related art;

[0024] Figure 2 A schematic diagram of a fixed structure of a projection screen in related technology;

[0025] Figure 3 A schematic diagram of the projection device in use according to an embodiment of the present application;

[0026] Figure 4 A schematic structural diagram of a rollable projection screen provided in an embodiment of the present application;

[0027] Figure 5 A schematic structural diagram of another rollable projection screen provided in an embodiment of the present application;

[0028] Figure 6 A schematic structural diagram of another rollable projection screen provided in an embodiment of the present application;

[0029] Figure 7 A schematic structural diagram of another rollable projection screen provided in an embodiment of the present application;

[0030] Figure 8 A schematic structural diagram of another rollable projection screen provided in an embodiment of the present application;

[0031] Figure 9 A schematic diagram of the overall structure of a rollable projection screen provided in an embodiment of the present application;

[0032] Figure 10 A schematic diagram of the overall structure of a rollable projection screen provided in an embodiment of the present application;

[0033] Figure 11A schematic structural diagram of a surface layer provided in an embodiment of the present application;

[0034] Figure 12 A schematic structural diagram of another surface layer provided in an embodiment of the present application;

[0035] Figure 13 for Figure 12 Schematic diagram of the structure of the micro-lens of the surface layer after atomization treatment;

[0036] Figure 14 A schematic structural diagram of a Fresnel lens layer provided in an embodiment of the present application;

[0037] Figure 15 A schematic structural diagram of a reflective layer provided in an embodiment of the present application;

[0038] Figure 16 A schematic structural diagram of another reflective layer provided in an embodiment of the present application.

[0039] Reference numerals:

[0040] 100-projection device; 1-rollable projection screen; 11-elastic recovery layer; 12-functional layer; 121-reflective layer; 122-surface layer; 123-base material layer; 124-Fresnel lens layer; 125-diffusion layer; 126-coloring layer; 127-adhesive layer; 2-projector; 21-incident light; 22-outgoing light; 3-audience; 4-diffusion particles; 5-microlens. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connect" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "connected" used in this application have the meaning of conducting electricity. The specific meanings need to be understood in the context.

[0045] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0046] 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.

[0047] In order to facilitate the transportation of the projection screen, the projection screen can be made of flexible materials. During transportation, the projection screen can be rolled up, saving transportation space and making transportation more convenient.

[0048] In the related art, projection screens are generally multi-layer film composite structures. During the production process, the tension of each layer is different, and the thermal expansion coefficient of each layer is different.

[0049] See also Figure 1 , Figure 1 This diagram shows the structure of a related art projection screen in different states. When the film layer is in state S, the entire screen is flat. However, after deformation, the layers recover to varying degrees. After further expansion, the film layer may be in state C1 or C2, resulting in an overall uneven projection screen and poor viewing quality.

[0050] For example, a projection screen in the related art generally comprises a functional layer and a base material layer, wherein the base material layer and the functional layer are stacked and both the functional layer and the base material layer are elastic.

[0051] The functional layer is used to achieve certain functions and adjust the viewing effect of the projection screen. The base material layer is used to support the functional layer and maintain the overall stability of the projection screen.

[0052] The functional layer is usually made of acrylic ultraviolet curing glue (Ultraviolet Rays, UV glue), and the base material layer is usually made of polyethylene terephthalate (PET). Among them, the thermal expansion coefficient of PET is 10 -5 The thermal expansion coefficient of the UV glue after curing is 10 -4 order of magnitude.

[0053] When existing projection screens are folded, the functional layer and the base material have different thermal expansion coefficients due to their different materials. Consequently, the functional layer and the base material experience different deformations after folding, preventing the projection screen from returning to a flat state when unfolded, affecting the audience's viewing experience.

[0054] In order to avoid the above problems, a rigid support structure is usually used to solve the deformation problem in related technologies. Figure 1 and Figure 2 , Figure 2 This is a schematic diagram of a related art projection screen fixing structure. A rigid support structure is provided on the back of the projection screen. This increases the overall thickness, volume, and weight of the projection screen, making it impossible to roll the projection screen for use.

[0055] Based on this, the embodiment of the present application provides a projection device 100, see Figure 3 , Figure 3 Schematic diagram of the projection device 100 in use according to an embodiment of the present application. The projection device 100 may include a rollable projection screen 1 and a projector 2.

[0056] Projector 2 can be located on one side of rollable projection screen 1, projecting light toward rollable projection screen 1. Rollable projection screen 1 receives the light projected by projector 2 and displays the image. The light from projector 2 passes through rollable projection screen 1 and is reflected back toward the side where projector 2 is located.

[0057] When the projection device 100 is in use, the projector 2 can be placed in front of and below the rollable projection screen 1, and the viewer 3 can be positioned in front of and looking at the rollable projection screen 1. The projector 2 emits an incident light 21 that shines onto the rollable projection screen 1. After being reflected by the rollable projection screen 1, the incident light 21 ultimately forms an outgoing light 22 that shines onto the viewer 3, while simultaneously forming an image on the rollable projection screen 1.

[0058] Figure 3The projector 2 shown may include a laser, which may be one of a monochromatic laser, a dual-color laser, and a tri-color laser. The tri-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 500 nm to 540 nm, and the wavelength of the red laser emitted may be set to a range of 610 nm to 650 nm.

[0059] Since three-color lasers have the advantages of color fidelity and a higher color gamut, the laser in the projector 2 provided in the embodiment of the present application can be a three-color laser. Of course, the laser in the projector 2 provided in the embodiment of the present application can also be a monochromatic laser or a two-color laser.

[0060] The rollable projection screen 1 provided in the embodiment of the present application is introduced below. Figure 4 As shown, Figure 4 This is a structural schematic diagram of a rollable projection screen 1 provided in an embodiment of the present application. The rollable projection screen 1 may include an elastic recovery layer 11 and at least one functional layer 12.

[0061] The at least one functional layer 12 is elastic. The elastic recovery layer 11 is stacked with the at least one functional layer 12. The elastic recovery layer 11 is made of a material comprising a polyether-amide block copolymer.

[0062] The polyether-amide block copolymer is used to impart shape memory properties to the elastic recovery layer 11 so that the rollable projection screen 1 can be restored to a flat state after being unfolded again.

[0063] Because the polyether-amide block copolymer enables the elastic recovery layer 11 to exhibit shape memory properties, the elastic recovery layer 11 exhibits shape memory properties when the rollable projection screen 1 is in a flat state. Thus, after the rollable projection screen 1 is rolled up and then unfolded, the shape memory properties of the elastic recovery layer 11 can restore the rollable projection screen 1 to its flat state, thereby enhancing the viewing experience of the viewer 3.

[0064] It is understood that the elastic recovery layer 11 and the at least one functional layer 12 stacked in the rollable projection screen 1 are bonded together. When the elastic recovery layer 11 returns to a flat state, the other film layers of the rollable projection screen 1 (the at least one functional layer 12) can be restored to a flat state, thereby ensuring that the rollable projection screen 1 remains flat after being rolled up and then unfolded.

[0065] In some embodiments, the polyether-amide block copolymer may include a hard segment and a soft segment. The hard segment is used to increase the stiffness of the elastic recovery layer, so that the elastic recovery layer remains flat after being curled and then unfolded. The soft segment is used to increase the flexibility of the elastic recovery layer, so that the elastic recovery layer can be curled.

[0066] Thus, the hard segments provide the polyether-amide block copolymer with good stiffness. When the rollable projection screen 1 is folded and then unfolded, the hard segments provide a certain degree of support. The soft segments also provide the polyether-amide block copolymer with good flexibility, facilitating the rollable projection screen 1 to be rolled up.

[0067] It can be understood that a microphase separation structure is formed between the soft segment and the hard segment, so that the elastic recovery layer 11 has shape memory properties, thereby allowing the rollable projection screen 1 to return to a flat state after being rolled up and unfolded, thereby improving the viewing experience of the audience 3.

[0068] In addition, it is understood that the higher the proportion of the soft segment in the polyether-amide block copolymer, the better the flexibility of the polyether-amide block copolymer and the lower the stiffness. In this way, the elastic recovery layer 11 is more likely to curl.

[0069] On the contrary, the higher the proportion of hard segments in the polyether-amide block copolymer, the higher the stiffness of the polyether-amide block copolymer and the lower its flexibility. In this way, the elastic recovery layer 11 is more likely to return to its original shape after curling.

[0070] In addition, by providing the elastic recovery layer 11, the rollable projection screen 1 can be flattened after being rolled up and then unfolded. The thickness, volume and weight of the rollable projection screen 1 will not increase, and an ultra-thin screen form can be achieved.

[0071] In order to better maintain the flat state of the elastic recovery layer 11, in some embodiments, the hard segment in the polyether-amide block copolymer may account for 50%-90%, and the soft segment in the polyether-amide block copolymer may account for 10%-50%.

[0072] In this way, due to the high proportion of hard segments in the polyether-amide block copolymer, the elastic recovery layer 11 has good stiffness as a whole, and the elastic recovery layer 11 can better maintain a flat state after being curled and unfolded, so that the rollable projection screen 1 can better maintain a flat state after being curled and unfolded.

[0073] Of course, in other embodiments, the proportion of the hard segment in the polyether-amide block copolymer can also be less than the proportion of the soft segment in the polyether-amide block copolymer. In this case, the elastic recovery layer 11 has good flexibility and can be rolled up more easily, facilitating better rolling of the rollable projection screen 1.

[0074] In some embodiments, see Figure 4 The rollable projection screen 1 may include multiple functional layers 12. The elastic recovery layer 11 may be stacked between the multiple functional layers 12. Since the elastic recovery layer 11 is disposed between the multiple functional layers 12, it may serve as a base material layer to play a supporting role.

[0075] Based on the proportion of hard segments and soft segments in the above polyether-amide block copolymer, when the proportion of hard segments is 50%-90% and the proportion of soft segments is 10%-50%, in some embodiments, the thickness of the elastic recovery layer 11 is 20μm-50μm.

[0076] Because the elastic recovery layer 11 plays a supporting role, it needs to ensure a certain supporting strength. When the thickness of the elastic recovery layer 11 is 20μm-50μm, the elastic recovery layer 11 is thicker and has better supporting strength, which can provide good support for the multi-layer functional layer 12.

[0077] It is understood that the specific thickness of the elastic recovery layer 11 can be selected according to actual conditions. For example, the thickness of the elastic recovery layer 11 can be 20 μm, 30 μm, 40 μm, or 50 μm.

[0078] In related art, the thickness of the substrate layer is generally 50μm, 100μm, 150μm, 250μm, etc., and the thickness of the substrate layer is relatively thick. Based on the above solution, the elastic recovery layer 11 provided in the embodiment of the present application can ensure its own thickness is relatively thin when used as a support for the substrate layer while ensuring the support strength.

[0079] It is understandable that, because the hard segments provide good support for the elastic recovery layer 11, the higher the proportion of soft segments in the polyether-amide block copolymer, the weaker the support of the elastic recovery layer 11, and the need to increase the thickness to ensure support. Therefore, while ensuring the performance of the elastic recovery layer 11, the higher the proportion of soft segments in the polyether-amide block copolymer, the greater the required thickness of the elastic recovery layer 11.

[0080] Conversely, because the hard segments provide good support for the elastic recovery layer 11, the higher the proportion of hard segments in the polyether-amide block copolymer, the stronger the support of the elastic recovery layer 11, eliminating the need to increase the thickness to ensure support. Therefore, while ensuring the performance of the elastic recovery layer 11, the higher the proportion of hard segments in the polyether-amide block copolymer, the smaller the required thickness of the elastic recovery layer 11.

[0081] As can be seen from the above, when the elastic recovery layer 11 is located between multiple functional layers 12, the specific thickness of the elastic recovery layer 11 may also vary depending on the ratio of the hard segment to the soft segment in the polyether-amide block copolymer.

[0082] Below, the thickness of the elastic recovery layer 11 when it is located between the multiple functional layers 12 is exemplified based on the different proportions of the hard segment and the soft segment in the polyether-amide block copolymer.

[0083] In some embodiments, the hard segments in the polyether-amide block copolymer account for 60%, the soft segments in the polyether-amide block copolymer account for 40%, and the thickness of the elastic recovery layer 11 can be 50 μm. In this case, since the hard segments account for a relatively low proportion of the polyether-amide block copolymer, the elastic recovery layer 11 is set to be relatively thick.

[0084] In some embodiments, the hard segments in the polyether-amide block copolymer account for 70%, the soft segments in the polyether-amide block copolymer account for 30%, and the thickness of the elastic recovery layer 11 is 30 μm. In this case, due to the relatively high proportion of the hard segments in the polyether-amide block copolymer, the thickness of the elastic recovery layer 11 is set to be relatively thin.

[0085] In other embodiments, see Figure 5 , Figure 5 This is a schematic diagram of the structure of another rollable projection screen 1 provided in an embodiment of the present application. An elastic recovery layer 11 can be laminated on one side of at least one functional layer 12. In this case, the elastic recovery layer 11 can serve as a protective layer, providing some protection for the rollable projection screen 1.

[0086] Based on the above position, in some embodiments, the thickness of the elastic recovery layer 11 is 10 μm-20 μm. Since the elastic recovery layer 11 does not need to provide additional support for the rollable projection screen 1, the elastic recovery layer 11 can be set to be thinner.

[0087] It is understood that the specific thickness of the elastic recovery layer 11 can be selected according to actual conditions. For example, the thickness of the elastic recovery layer 11 can be 10 μm, 15 μm, or 20 μm.

[0088] As mentioned above, the elastic recovery layer 11 can be disposed between multiple functional layers 12. To ensure efficient light utilization and a better viewing experience for viewer 3, in some embodiments, the elastic recovery layer 11 can also include a modified material. This modified material is used to modify the polyether-amide block copolymer and improve the light transmittance of the elastic recovery layer 11.

[0089] Therefore, by modifying the polyether-amide block copolymer, the light transmittance of the elastic recovery layer 11 will be improved, so that light can better penetrate the elastic recovery layer 11, the utilization rate of light is higher, and the audience's viewing experience is better.

[0090] In some embodiments, the light transmittance of the elastic recovery layer 11 may be greater than 90%. In this case, the light transmittance of the elastic recovery layer 11 is good, which can ensure the utilization rate of light.

[0091] The following is a schematic illustration of a method for modifying a polyether-amide block copolymer.

[0092] In some embodiments, the modified material may include a nucleating agent, which is used to reduce the crystal grains of the polyether-amide block copolymer to improve the light transmittance of the elastic recovery layer 11 .

[0093] The nucleating agent molecules can provide more nucleating centers, which can promote the polyamide segments to form crystals faster during the polymerization process of the polyether-amide block copolymer, thereby increasing the crystallization rate of the polyamide segments, thereby refining the grain size of the polyamide segments and improving the light transmittance of the elastic recovery layer 11.

[0094] For example, the proportion of the nucleating agent in the elastic recovery layer 11 may be 1%-2%. After the nucleating agent is added, the grain size of the polyamide segment can be reduced from 25 μm-30 μm to 5 μm-15 μm.

[0095] The specific type of nucleating agent can be selected according to actual conditions. In some embodiments, the nucleating agent can be nano-silicon dioxide.

[0096] Nano-silicon dioxide has stable chemical properties, is non-toxic and odorless, does not react with many chemicals, and does not release harmful substances when used, thereby improving the safety factor of the rollable projection screen 1.

[0097] In some embodiments, nano-zirconia may also be used as the nucleating agent.

[0098] Nano-zirconia has an extremely small particle size and can provide a large number of highly active nucleation centers, which can significantly increase the crystallization rate of the polyamide segment, refine the grain size of the polyamide segment, and improve the light transmittance of the elastic recovery layer 11.

[0099] In some embodiments, zinc oxide whiskers may also be used as the nucleating agent.

[0100] Zinc oxide whiskers have high thermal stability and good thermal conductivity, which can improve the heat dissipation effect of the rollable screen.

[0101] In some embodiments, amides may also be used as nucleating agents.

[0102] The polyamide has an extremely small particle size and can provide a large number of highly active nucleation centers, which can significantly increase the crystallization rate of the polyamide segment, refine the grain size of the polyamide segment, and improve the light transmittance of the polyamide elastic recovery layer 11 .

[0103] It is understandable that the present application does not limit the material of the nucleating agent, and the material can be selected according to actual conditions.

[0104] In some embodiments, the modifying material further comprises a hydroxyl compound, which is used to cause an esterification reaction to occur in the polyether-amide block copolymer during its formation, thereby modifying the polyether-amide block copolymer.

[0105] During the polymerization of the polyether-amide block copolymer, the hydroxyl compound can undergo an esterification reaction with the carboxylic acid group in the polyamide precursor.

[0106] The esterification reaction can adjust the arrangement structure of the polyamide molecular chains, making the polyamide molecular chains more uniform and compact, reducing impurities and defects in the polyamide molecular chains, thereby improving the propagation and transmission efficiency of light in the elastic recovery layer 11.

[0107] In some embodiments, the hydroxy compound may be methanol.

[0108] In other embodiments, the hydroxy compound may be ethanol.

[0109] It should be noted that the hydroxyl compound may also be made of other materials, which can be selected according to actual conditions, and this application does not limit this.

[0110] In some embodiments, the elastic recovery layer 11 further includes a catalyst. The catalyst can be used to promote the esterification reaction. For example, the catalyst can be sulfuric acid, p-toluenesulfonic acid, sodium hydroxide, or potassium hydroxide. It is understood that the catalyst can also be made of other materials, and the specific selection can be based on actual conditions, and this application does not limit this.

[0111] In some embodiments, the modified material further includes a methylating agent, which is used to chemically bond with the polyether-amide block copolymer to reduce the crystallinity of the polyether-amide block copolymer, thereby increasing the light transmittance of the elastic recovery layer 11 .

[0112] The methylating agent will undergo a substitution reaction with some functional groups of the polyamide in the polyether-amide block copolymer, and the methyl groups in the methylating agent will be introduced into the side chains of the polyamide.

[0113] By introducing methyl groups into the side chains of polyamide, on the one hand, the arrangement of the polyamide molecular chains can be disturbed, the intermolecular crystallization can be reduced, thereby reducing the crystallinity of the polyamide and improving the light transmittance of the polyether-amide block copolymer.

[0114] On the other hand, introducing methyl groups into the side chains of polyamide can increase the flexibility of the polyamide molecular chain, making it easier for the polyamide molecular chain to bend under the action of light without scattering, thereby improving the light transmittance of the polyether-amide block copolymer.

[0115] On the other hand, the introduction of methyl groups into the side chains of polyamide can reduce the refractive index inhomogeneity of the polyamide molecular chain, making the propagation of light in the polyether-amide block copolymer more uniform, thereby improving the light transmittance of the polyether-amide block copolymer.

[0116] It is understandable that the present application does not limit the material of the methylation reagent, and the material can be selected according to actual conditions.

[0117] For example, the methylating agent may be methyl iodide. Methyl iodide has a high safety factor and can improve the safety factor of the rollable projection screen 1. For example, the methylating agent may also be methyl bromide.

[0118] In some embodiments, the hard segment may include polyamide.

[0119] For example, the hard segment may include nylon 1212 (Polyamide 1212, PA1212).

[0120] On the one hand, nylon 1212 has high tensile strength and, as a hard segment, can improve the overall mechanical properties of the elastic recovery layer 11. On the other hand, nylon 1212 has relatively low water absorption, which helps maintain the dimensional stability of the elastic recovery layer 11 in a humid environment.

[0121] For example, the hard segment may also include nylon 12 (Polyamide 12, PA12).

[0122] Nylon 12 has good resistance to many chemicals, and thus, as a hard segment, helps to improve the corrosion resistance of the elastic recovery layer 11 when it contacts various chemicals.

[0123] For example, the hard segment may also include polyimide (PA).

[0124] Since polyimide has an extremely high thermal decomposition temperature, it can maintain good mechanical properties even in a high-temperature environment, which helps to maintain the dimensional stability of the elastic recovery layer 11 in a high-temperature environment.

[0125] In some embodiments, the soft segment may include a polyether.

[0126] For example, the soft segment may include polytetramethylene ether glycol (PTMEG).

[0127] Since polyoxytetramethylene ether glycol is very flexible, it can give the elastic recovery layer 11 excellent flexibility and resilience, so that it has good impact resistance and fatigue tolerance.

[0128] Exemplarily, the soft segment may also include polytetrahydrofuran diol (PTHF). Since polytetrahydrofuran diol has a low degree of crystallinity, this is beneficial to the light transmittance and surface smoothness of the elastic recovery layer 11, thereby improving visual clarity and aesthetics.

[0129] It is understandable that the rollable projection screen provided in the embodiment of the present application may have different structures. The rollable projection screen provided in the embodiment of the present application is exemplarily described below with reference to the accompanying drawings.

[0130] In some embodiments, see Figure 4 At least one functional layer 12 includes a reflective layer 121. The reflective layer 121 is used to reflect the light projected by the projector toward the area where the audience 3 is located, thereby enhancing the brightness and contrast of the image. The elastic recovery layer 11 and the reflective layer 121 are stacked.

[0131] In some embodiments, as Figure 4 As shown, the at least one functional layer 12 further includes a surface layer 122. The surface layer 122 can protect the rollable projection screen 1.

[0132] In some embodiments, see Figure 4 The elastic recovery layer 11 can be disposed between the reflective layer 121 and the surface layer 122. Thus, on the one hand, the elastic recovery layer 11 can restore the rollable projection screen 1 to a flat state after being rolled up and then unfolded. On the other hand, the elastic recovery layer 11 can provide support for the rollable projection screen 1.

[0133] In some embodiments, see Figure 5 , at least one functional layer 12 further includes a substrate layer 123. The substrate layer 123 is used to provide support for the rollable projection screen 1. Figure 5 As shown, the elastic recovery layer 11 may be disposed on a side of the reflective layer 121 away from the substrate layer 123 .

[0134] Thus, on the one hand, the elastic recovery layer 11 can make the rollable projection screen 1 return to a flat state after being rolled up and then unfolded. On the other hand, the elastic recovery layer 11 plays a certain protective role for the rollable projection screen 1.

[0135] Below, Figure 4 Taking the rollable projection screen 1 shown as an example, a method for restoring the rollable projection screen 1 to a flat state after being rolled up and then unfolded is exemplarily described.

[0136] For example, when the rollable projection screen 1 is curled due to a large change in temperature and humidity, the rollable projection screen 1 can be restored to a flat state by placing it in a user's environment.

[0137] For example, under the conditions of 20-35° C. and 40-75% RH, the rollable projection screen 1 can be restored to a flat state.

[0138] For example, when the rollable projection screen 1 is curled due to local force, heating or irradiation can be applied to the rollable projection screen 1 to restore it to a flat state.

[0139] In some embodiments, see Figure 4 The multi-layer functional layer 12 may further include a Fresnel lens layer 124 having a Fresnel microstructure. The reflective layer 121 may be disposed on the surface of the Fresnel lens layer 124 having the Fresnel microstructure.

[0140] The light emitted by the projector 2 is refracted by the surface layer 122 of the rollable projection screen 1 and enters the interior of the screen. After being reflected by the Fresnel lens layer 124 and the reflective layer 121 , the light is emitted from the screen and finally enters the human eye.

[0141] When the external ambient light passes through the Fresnel microstructure, part of the light will be reflected to the area that is not visible to the human eye, so that the rollable projection screen 1 has a certain ability to resist ambient light.

[0142] At the same time, the Fresnel microstructure has the function of converging light. After the light projected by the projector 2 is reflected by the reflective layer 121, it will converge toward the center of the rollable projection screen 1, so that the audience 3 can watch a brighter image when facing the rollable projection screen 1, and the gain of the rollable projection screen 1 is higher.

[0143] In some embodiments, as Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of another rollable projection screen 1 provided in an embodiment of the present application. The rollable projection screen 1 may further include a diffusion layer 125. The diffusion layer 125 may be stacked on the side of the Fresnel lens layer 124 away from the reflective layer 121. Diffusing particles 4 may be distributed within the diffusion layer 125. Light projected by the projector 2 passes through the diffusion particles 4 within the diffusion layer 125, where they diffuse in all directions.

[0144] Due to the diffusion of light, the viewing angle of the rollable projection screen 1 is increased. Furthermore, the diffusion of light reduces the degree of light interference on the surface of the rollable projection screen 1, thereby reducing the severity of speckle on the surface of the rollable projection screen 1. The material of the diffusion particles 4 can be polymethyl methacrylate (PMMA).

[0145] like Figure 7 As shown, Figure 7 This is a schematic structural diagram of another rollable projection screen 1 provided in an embodiment of the present application. In other embodiments, diffusion particles 4 may be distributed in the reflective layer 121 .

[0146] When the light projected by the projector 2 passes through the reflective layer 121 , it will pass through the diffusion particles 4 in the reflective layer 121 and diffuse in all directions under the action of the diffusion particles 4 , thereby increasing the viewing angle of the rollable projection screen 1 .

[0147] In addition, when the diffusion particles 4 are disposed on the reflective layer 121, there is no need to provide a separate diffusion layer 125 ( Figure 6 ), reducing the thickness of the rollable projection screen 1 to meet the thickness requirements of users.

[0148] In some embodiments, as Figure 6 As shown, the at least one functional layer 12 may further include a coloring layer 126. A dark dye is distributed within the coloring layer 126. When ambient light passes through the coloring layer 126, it is absorbed by the dark dye within the coloring layer 126, thereby providing the rollable projection screen 1 with improved resistance to ambient light.

[0149] In some embodiments, as Figure 4 As shown, a dark dye can also be distributed within the reflective layer 121. This allows light to be absorbed by the dark dye as it passes through the reflective layer 121, thereby improving the rollable projection screen 1's ability to block ambient light. Furthermore, since light only passes through the reflective layer 121 once, the proportion of light projected by the projector 2 absorbed by the dark dye is reduced, thereby improving light utilization.

[0150] In some embodiments, see Figure 8 , Figure 8 This is a structural schematic diagram of another rollable projection screen 1 provided in an embodiment of the present application. At least one functional layer 12 may further include an adhesive layer 127. The adhesive layer 127 may be located between one side of the elastic recovery layer 11 and is used to bond the elastic recovery layer 127 and other functional layers 12.

[0151] For example, the adhesive layer 127 may be a UV adhesive layer. UV adhesive has the characteristics of rapid curing and strong adhesion, and the curing time is generally only a few seconds to a few minutes. After curing, a strong connection can be formed, which greatly improves the production efficiency of the rollable projection screen 1.

[0152] The surface layer 122 of the rollable projection screen 1 provided in the embodiment of the present application can have different structures. The following is an illustrative description of several different surface layers 122 provided in the embodiment of the present application in conjunction with the accompanying drawings.

[0153] like Figure 9 As shown, Figure 9 This is a schematic diagram of the overall structure of a rollable projection screen 1 provided in an embodiment of the present application. In some embodiments, the surface of the surface layer 122 facing away from the Fresnel lens layer 124 can be a matte surface, which has a low light reflectivity. As a result, when the light projected by projector 2 reaches this surface, more of it will pass through it and enter the interior of the rollable projection screen 1, improving the utilization rate of the light projected by projector 2, ensuring the gain of the rollable projection screen 1, and making it less likely that the light projected by projector 2 will form a clear image elsewhere (such as the ceiling), thus ensuring a good viewing experience for viewer 3.

[0154] At the same time, if Figure 10 As shown, Figure 10 This is a schematic diagram of the overall structure of a rollable projection screen 1 provided in an embodiment of the present application. Because surface layer 122 is a misted, uneven surface, light is scattered upon reaching surface layer 122, thereby improving the viewing angle of rollable projection screen 1. The surface of surface layer 122 facing away from Fresnel lens layer 124 can be sandblasted to create a misted surface, which is simple, convenient, and easy to implement.

[0155] like Figure 11 As shown, Figure 11 This is a structural diagram of a surface layer 122 provided in an embodiment of the present application. The surface layer 122 is distributed with diffusion particles 4. When light passes through the diffusion particles 4 in the surface layer 122, it will also diffuse, thereby increasing the viewing angle and reducing the degree of interference between light.

[0156] like Figure 12 As shown, Figure 12Schematic diagram of the structure of another surface layer 122 provided in an embodiment of the present application. In some embodiments, the rollable projection screen 1 may further include microlenses 5. Microlenses 5 (Lenti) are distributed on the surface of the surface layer 122 away from the diffusion layer 125 (left side). By providing the microlenses 5, the surface layer 122 forms uneven protrusions, which can also increase the viewing angle of the rollable projection screen 1, while also reducing the surface reflectivity and improving the utilization rate of the light projected by the projector 2. The shape of the microlenses 5 can be hemispherical.

[0157] See Figure 13 , Figure 13 for Figure 12 The schematic diagram of the structure of the microlens 5 of the surface layer 122 after atomization is shown. In some embodiments, the surface of the microlens 5 can be atomized. By atomizing the surface of the microlens 5, the surface roughness can be further increased, 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 the gain effect, and reducing the probability of light being reflected elsewhere to form a clear image.

[0158] In some embodiments, see Figure 14 , Figure 14 This is a schematic diagram of the structure of a Fresnel lens layer 124 provided in an embodiment of the present application. Microlenses 5 are provided on the surface of the Fresnel lens layer 124 on the side where the Fresnel microstructure is located. The microlenses 5 diffuse light, thereby increasing the viewing angle of the projection screen. Furthermore, the coherence between the diffused light rays is reduced, thereby reducing the severity of speckle formed on the projection screen.

[0159] As can be seen from the above, the reflective layer 121 can reflect light. To achieve the reflective function of the reflective layer 121, the reflective material in the reflective layer 121 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 121. Below, using aluminum as the reflective material as an example, combined with the accompanying drawings, several different reflective layers 121 proposed in the embodiments of this application are exemplified.

[0160] In some embodiments, as Figure 15 As shown, Figure 15This is a schematic diagram of the structure of a reflective layer 121 provided in an embodiment of the present application. To improve the gain of the rollable projection screen 1, powdered aluminum can be applied to the Fresnel lens layer 124 by spray printing or vapor deposition. Because the powdered aluminum is finer and less directional, the light emitted by the projector 2 is mostly reflected directionally out of the projection screen based on the microstructure of the Fresnel lens layer 124, eliminating scattered light reflections and thus achieving a higher gain.

[0161] Furthermore, when aluminum particles are used as the reflective material, the diameter of the aluminum particles can range from 5 μm to 20 μm. Aluminum particles within this range, due to their small diameter, form a dense reflective surface after forming reflective layer 121. 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, reflective layer 121 can be made very thin, thereby reducing aluminum material consumption and manufacturing costs.

[0162] In other embodiments, Figure 16 As shown, Figure 16 This is a schematic diagram of the structure of another reflective layer 121 provided in an embodiment of the present application. When aluminum is used as the reflective material for reflective layer 121, flaky aluminum powder can also be used. The flaky aluminum powder is spray-coated onto the Fresnel lens layer 124 using a spray-printing method. Because the flaky aluminum powder has a larger diameter-to-thickness ratio, it has a stronger bonding ability with aluminum and is less likely to fall off. The diameter-to-thickness ratio of the flaky aluminum powder can range from 40:1 to 100:1.

[0163] The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A rollable projection screen, characterized in that: The rollable projection screen comprises: at least one functional layer, wherein the at least one functional layer has elasticity; and an elastic recovery layer, the elastic recovery layer being stacked with the at least one functional layer; The material of the elastic recovery layer includes a polyether-amide block copolymer; the polyether-amide block copolymer is used to enable the elastic recovery layer to produce shape memory properties, so that the rollable projection screen can be restored to a flat state after being rolled up and then unfolded.

2. The rollable projection screen according to claim 1, characterized in that: The polyether-amide block copolymer comprises: a hard segment, wherein the hard segment is used to increase the stiffness of the elastic recovery layer so that the elastic recovery layer remains flat after being curled and then unfolded; and A soft segment, wherein the soft segment is used to improve the flexibility of the elastic recovery layer so that the elastic recovery layer can be curled; Wherein, the hard segment in the polyether-amide block copolymer accounts for 50%-90%, and the soft segment in the polyether-amide block copolymer accounts for 10%-50%.

3. The rollable projection screen according to claim 2, wherein: The rollable projection screen includes multiple functional layers; the elastic recovery layer is stacked between the multiple functional layers, and the thickness of the elastic recovery layer is greater than or equal to 20 μm, and the thickness of the elastic recovery layer is less than or equal to 50 μm.

4. The rollable projection screen according to claim 3, wherein: The hard segment in the polyether-amide block copolymer accounts for 70%, and the soft segment in the polyether-amide block copolymer accounts for 30%; the thickness of the elastic recovery layer is 30 μm; or, The hard segment in the polyether-amide block copolymer accounts for 60%, and the soft segment in the polyether-amide block copolymer accounts for 40%. The thickness of the elastic recovery layer is 50 μm.

5. The rollable projection screen according to claim 2, wherein: The elastic recovery layer is stacked on one side of the at least one functional layer; the thickness of the elastic recovery layer is greater than or equal to 10 μm, and the thickness of the elastic recovery layer is less than or equal to 20 μm.

6. A rollable projection screen according to any one of claims 1 to 5, characterized in that: The elastic recovery layer further comprises: A modified material is used to modify the polyether-amide block copolymer to improve the light transmittance of the elastic recovery layer.

7. The rollable projection screen according to claim 6, characterized in that: The modified material includes: A nucleating agent is used to reduce the crystal grains of the polyether-amide block copolymer to improve the light transmittance of the elastic recovery layer.

8. The rollable projection screen according to claim 6, wherein: The modified material includes: The hydroxyl compound is used to cause an esterification reaction to occur in the polyether-amide block copolymer during its formation, so as to modify the polyether-amide block copolymer.

9. The rollable projection screen according to claim 6, wherein: The modified material includes: A methylating agent is used to chemically bond with the polyether-amide block copolymer to reduce the crystallinity of the polyether-amide block copolymer, thereby increasing the light transmittance of the elastic recovery layer.

10. A projection device, characterized in that: The projection device comprises: The rollable projection screen according to any one of claims 1 to 9; and A projector is located on one side of the rollable projection screen; the projector is used to emit projection light toward the rollable projection screen; the light projected by the projector passes through the rollable projection screen and is reflected to the side where the projector is located.

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