Projection screen and projection device

Abstract

The application discloses a projection screen and a projection device, and belongs to the technical field of projection. The projection screen comprises a projection curtain, a first magnetic structure, a second magnetic structure, a support structure layer and a reel assembly. The first magnetic structure is arranged on the back of the projection curtain, the second magnetic structure is located on one side of the support structure layer, the other side of the support structure layer is attached to the side of the first magnetic structure away from the projection curtain, and the second magnetic structure and the first magnetic structure are mutually adsorbed. One end of the projection curtain and the support structure layer is connected with the reel assembly. Since the two magnetic structures are not in direct contact, the support structure layer between the two magnetic structures can serve as a buffer layer to reduce the risk of mutual extrusion of the magnetic structures when they are in direct contact to damage the projection curtain, solve the problem that the projection screen is prone to damage in the prior art, and improve the protection effect on the projection screen.

Description

TECHNICAL FIELD

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

[0002] The projection screen is a device for receiving the image screen projected by the projector.

[0003] A projection screen includes a curtain, a roller blind and a roller, one end of the curtain and the support structure layer is connected with the roller, so as to be stored on the roller. The back of the curtain has a magnetic layer, and one side of the support structure layer also has a magnetic layer. The magnetic layer on the support structure layer is adsorbed with the magnetic layer on the curtain to support the curtain and avoid the curling of the curtain in the unfolded state.

[0004] However, the magnetic layer on the support structure layer of the above-mentioned projection screen is easy to damage the curtain, and the support structure layer is easy to squeeze the curtain, resulting in easy damage of the projection screen. SUMMARY

[0005] The present application provides a projection screen and a projection device. The technical solution is as follows:

[0006] In one aspect of the present application, a projection screen is provided, which includes a projection curtain, a first magnetic structure, a second magnetic structure, a support structure layer and a roller assembly.

[0007] The first magnetic structure is arranged on the back of the projection curtain, the second magnetic structure is located on one side of the support structure layer, the other side of the support structure layer is attached to the side of the first magnetic structure away from the projection curtain, and the second magnetic structure and the first magnetic structure are adsorbed with each other.

[0008] One end of the projection curtain and the support structure layer is connected with the roller assembly.

[0009] Optionally, the second magnetic structure includes a plurality of magnetic strips, and the plurality of magnetic strips are arranged on the support structure layer in a direction away from the roller assembly.

[0010] Optionally, the support structure layer includes a support structure substrate layer and a plurality of fixing structures, the plurality of fixing structures are arranged on the support structure substrate layer in a direction away from the roller assembly, and the plurality of magnetic strips are one-to-one corresponding to the plurality of fixing structures.

[0011] Optionally, the fixing structure includes a mesh, and the magnetic strip is located in the mesh.

[0012] Alternatively, the fixing structure comprises at least two fixing bands, two ends of the fixing bands are connected with the support structure substrate layer respectively, and the magnetic strip passes through the at least two fixing bands and is fixed on the support structure substrate layer by the two fixing bands.

[0013] Optionally, the support structure layer comprises a flexible substrate layer and a support structure on the flexible substrate layer, and the magnetic strip is located on a side of the flexible substrate layer away from the projection curtain.

[0014] Optionally, the material of the flexible substrate layer comprises at least one of synthetic cloth, polyethylene terephthalate and polyimide.

[0015] Optionally, the support structure layer comprises a roller blind assembly, the roller blind assembly comprises a plurality of roller blind pieces connected in sequence in a direction away from the roller tube assembly, and the second magnetic structure is located on a side of the roller blind assembly away from the projection curtain.

[0016] Optionally, the second magnetic structure is pasted on a side of the roller blind assembly away from the projection curtain.

[0017] Alternatively, the projection screen further comprises a plurality of screws, a plurality of roller blind pieces in the roller blind assembly are provided with screw holes, the plurality of screws pass through the second magnetic structure and are threadedly connected with the screw holes, so as to fix the second magnetic structure on the roller blind assembly.

[0018] Alternatively, the projection screen further comprises a retaining assembly, the retaining assembly fixes the second magnetic structure on the roller blind assembly.

[0019] Optionally, the second magnetic structure comprises a first magnetic substructure and a second magnetic substructure, a direct projection of the first magnetic substructure on the projection curtain is located in an edge region of the projection curtain, a direct projection of the second magnetic substructure on the projection curtain has a spacing between the direct projection and the edge region of the projection curtain, the magnetic property of the first magnetic substructure is greater than that of the second magnetic substructure, and the edge region is a region comprising an edge of the projection curtain.

[0020] According to another aspect of the embodiments of the present application, a projection device is provided, which comprises a projector and the projection screen.

[0021] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects:

[0022] By setting the second magnetic structure on the side of the support structure layer away from the projection curtain, and by the second magnetic structure and the first magnetic structure set on the projection curtain spare part being mutually adsorbed, the projection curtain is attached to the support structure layer, and the projection curtain is supported by the support structure layer, and since the two magnetic structures are not in direct contact, the support structure layer between the two magnetic structures can act as a buffer layer to reduce the risk of mutual extrusion of the magnetic structures when they are in direct contact to damage the projection curtain, solving the problem of easy damage of the projection screen in the related art, and improving the protection effect of the projection screen.

[0023] In addition, since the pressure applied by the two magnetic structures to the projection screen is reduced, the problem of creases in the projection screen under the action of the pressure can be avoided, the flatness of the projection curtain after being unfolded can be improved, and the display effect of the projection screen can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is a structural schematic diagram of a projection screen;

[0026] Figure 2 is a structural schematic diagram of another projection curtain;

[0027] Figure 3 is a structural schematic diagram of a projection screen provided by an embodiment of the present application;

[0028] Figure 4 is a right view of the projection curtain shown in Figure 3

[0029] Figure 5 is a structural schematic diagram of another projection screen provided by an embodiment of the present application;

[0030] Figure 6 is a left view of the projection screen shown in Figure 5

[0031] is a structural schematic diagram of another projection screen provided by an embodiment of the present application; Figure 7

[0032] is a structural schematic diagram of another projection screen provided by an embodiment of the present application; Figure 8

[0033] Figure 9 ​​is a structural schematic diagram of another projection screen provided by an embodiment of the present application;

[0034] Figure 10 is a structural schematic diagram of another projection screen provided by an embodiment of the present application;

[0035] Figure 11 is a structural schematic diagram of another projection screen provided by an embodiment of the present application;

[0036] Figure 12 is a structural schematic diagram of a projection device provided by an embodiment of the present application.

[0037] The specific embodiments of the present application have been shown in the above-described drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be described in further detail below with reference to the drawings.

[0039] A projection screen is a device for receiving the image screen projected by a projector. In order to improve the ease of use of the projection screen, a projection screen that can be accommodated in a reel is currently used. As shown in Figure 1 , Figure 1 is a structural schematic diagram of a projection screen, which comprises a crossbeam 11, a reel 12 and a flexible curtain 13. The crossbeam 11 is arranged at the upper edge of the curtain 13, and the reel 12 is located at the lower edge of the curtain 13. The reel 12 and the crossbeam 11 can tension the curtain 13. The tension in each direction of the central region 131 of the curtain 13 is substantially equal, so that the central region 131 has a higher flatness. However, the tension in different directions of the region deviating from the center of the curtain 131 is not equal, especially in the left and right edge regions 132 without external force, which leads to the imbalance of the left and right edge regions 132. This imbalance can cause the curtain to shrink inward, curl and wrinkle, etc., which affects the display effect of the projection curtain.

[0040] In order to solve the problem of uneven edges of the curtain, a projection screen can be as shown in Figure 2 , Figure 2 is a structural schematic diagram of another projection curtain Figure 2The side view of the projection screen can be a projection curtain, and the observation angle can be parallel to the surface of the curtain. The projection curtain includes a curtain 21, a roller 22, and a winding drum 23. The back surface of the curtain 21 (the curtain can include an opposite front surface and a back surface, and the front surface is the surface bearing the image picture) has a first magnetic layer 21a. One surface of the roller 22 towards the curtain 21 has a second magnetic layer 22a. The first magnetic layer 21a and the second magnetic layer 22a are attached to each other, so that the roller 22 can support the curtain 21. In addition, one end of the curtain 21 and the roller 22 is connected to the winding drum 23, so as to be stored on the winding drum 23. The roller 22 includes some hard structures, which can be used to support the curtain 21, so as to avoid the edge of the curtain 21 from curling.

[0041] However, when the projection screen is curled (such as when it is curled and stored in the winding drum 23), the first magnetic layer 21a and the second magnetic layer 22a will be pressed against each other and generate a large pressure. The pressure will be transmitted to the curtain and can cause the curtain to wrinkle and wear, and even damage the curtain, thereby causing the display effect of the projection screen to be poor, and shortening the service life of the projection screen.

[0042] The embodiment of the present application provides a projection screen, which can solve some problems in the related art.

[0043] Figure 3 FIG. 1 is a structural schematic diagram of a projection screen provided by an embodiment of the present application, Figure 4 Figure 3 FIG. 2 is a right view of the projection curtain shown in FIG. 1, please refer to Figure 3 Figure 4 The projection screen includes a projection curtain 31, a first magnetic structure c1, a second magnetic structure c2, a support structure layer 32, and a winding drum assembly 33.

[0044] The first magnetic structure c1 is arranged on the back surface of the projection curtain 31 (the projection curtain 31 can have a front surface for bearing the image picture, and a back surface opposite to the front surface). The second magnetic structure c2 is located on one surface of the support structure layer 32. The other surface of the support structure layer 32 is attached to the side of the first magnetic structure c1 away from the projection curtain 31, and the second magnetic structure c2 and the first magnetic structure c1 are attracted to each other.

[0045] One end of the projection curtain 31 and the support structure layer 32 is connected to the winding drum assembly 33.

[0046] ​​In summary, the projection screen provided by the embodiment of the present application has the following advantages. The second magnetic structure is arranged on the side of the support structure layer away from the projection curtain, and the second magnetic structure and the first magnetic structure arranged on the projection curtain spare part are attracted to each other, so that the projection curtain is attached to the support structure layer and supported by the support structure layer. Since the two magnetic structures are not in direct contact, the support structure layer between the two magnetic structures can act as a buffer layer to reduce the risk of mutual extrusion of the magnetic structures when they are in direct contact and damage the projection curtain. The problem of easy damage of the projection screen in the related art is solved, and the protection effect of the projection screen is improved.

[0047] In addition, since the pressure applied by the two magnetic structures to the projection screen is reduced, the problem of creases in the projection screen under the action of the pressure can be avoided, the flatness of the projection curtain after being unfolded can be improved, and the display effect of the projection screen can be improved.

[0048] It should be noted that since the second magnetic structure c2 and the first magnetic structure c1 are separated by the support structure layer 32, but the support structure layer 32 does not isolate the magnetic field. The projection screen provided by the embodiment of the present application can avoid isolation of the magnetic field by the support structure layer 32 in various ways. In one solution, the support structure layer 32 can use a material that does not affect the magnetic field. In another solution, the region of the support structure layer where the second magnetic structure c2 is arranged (this region can refer to the region occupied by the orthographic projection of the second magnetic structure c2 on the support structure layer) can use a material that does not affect the magnetic field, and other regions can use other materials, or other regions can also use a material that does not affect the magnetic field. The embodiment of the present application does not limit this.

[0049] Figure 5 is another structure diagram of a projection screen provided by the embodiment of the present application, Figure 6 is Figure 5 is a left view of the projection screen shown in FIG. 8, please refer to Figure 5 ( Figure 5 is a view of the side of the projection screen where the second magnetic structure is arranged) and Figure 6 , wherein the second magnetic structure c2 includes a plurality of magnetic strips c21, and the plurality of magnetic strips c21 are arranged on the support structure layer 32 in a direction f1 away from the roller assembly 33. The plurality of magnetic strips c21 can be arranged at various positions on the support structure layer 32, so that each position of the support structure layer 32 can be attached to the first magnetic structure c1 on the projection curtain 31, thereby improving the support effect of the support structure layer 32 on the projection curtain 31.

[0050] Exemplarily, the edge of the support structure layer in the transverse direction (which can refer to a direction parallel to the axis of the reel assembly 33) f3 can be flush (or substantially flush) with the edge of the projection curtain 31 in the transverse direction, and the orthographic projection of the magnetic strip c21 on the projection curtain 31 can be in contact with the edge of the projection curtain 31, so that the edge of the support structure layer 32 can be closely attached to the edge of the projection curtain 31, so that the support structure layer 32 can support the edge of the projection curtain 31 to improve the flatness of the edge of the projection curtain 31, and further improve the display effect of the projection screen.

[0051] In an exemplary embodiment, the plurality of magnetic strips c21 can be uniformly arranged on the support structure layer 32. Specifically, the distance between any two adjacent magnetic strips c21 in the plurality of magnetic strips c21 can be equal, so that the support force of each region of the support structure layer 32 on the projection curtain 31 is equal or similar, so as to further improve the flatness of the projection curtain 31 and improve the display effect of the projection screen. Of course, in some other exemplary embodiments, the distance between any two adjacent magnetic strips c21 can also be unequal, and the embodiments of the present application do not limit this.

[0052] It should be noted that the projection screen provided by the embodiments of the present application can include an unfolded state and a storage state, wherein the unfolded state refers to a state in which the projection curtain 31 and the support structure layer 32 are unfolded outside the reel assembly 33 without being wound on the reel assembly 33, and the storage state refers to a state in which the projection curtain 31 and the support structure layer 32 are wound on the reel assembly 33. The direction f1 in which the plurality of magnetic strips c21 are arranged on the support structure layer 32 away from the reel assembly 33 refers to the direction when the projection curtain 31 and the support structure layer 32 are in the unfolded state.

[0053] The magnetic strip c21 can also be made of a material that has magnetism and hardness, so that the magnetic strip t can not only be used to be attracted to the second magnetic structure in the projection curtain, but also be used to support the projection curtain together with the support structure layer 32, such as the center and the edge of the projection curtain, to improve the flatness of the center and the edge of the projection curtain.

[0054] In the embodiments of the present application, the magnetic strip c21 in the second magnetic structure can be fixed on the support structure layer 32 in various ways, which will be described below.

[0055] As shown in FIG. 6, the magnetic strip c21 can be fixed on the support structure layer 32 by a plurality of magnetic strips c21 arranged on the support structure layer 32. Figure 7 Figure 7 ​is another structural schematic diagram of a projection screen provided by an embodiment of the present application, wherein the support structure layer 32 comprises a support structure substrate layer 321 and a plurality of fixing structures 322, the plurality of fixing structures 322 are arranged on the support structure substrate layer 321 in a direction f1 away from the roll assembly 33, and the plurality of magnetic strips c21 are correspondingly located in the plurality of fixing structures 322. The fixing structure 322 can fix the magnetic strip c21 on the support structure layer 32, and in this fixing mode, the magnetic strip c21 is not easy to fall off from the support structure layer under various conditions such as projection screen curling or heating, the connection between the magnetic strip c21 and the support structure layer 32 is firm, and the reliability is high. The support structure substrate layer 321 can be used to realize the function of supporting the projection curtain 31.

[0056] Among them, the fixing structure 322 can have various structures, for example, one fixing structure 322 comprises a mesh bag, and the magnetic strip c21 is located in the mesh bag. The mesh bag is simple to set, easy to manufacture, and can reduce the manufacturing difficulty of the projection screen provided by the embodiment of the present application and improve the production efficiency. For example, the edge of the mesh material (such as mesh cloth) can be connected with the support structure substrate layer 321 (which can be connected by, for example, bonding or welding), that is, a mesh bag can be formed (the mesh bag can be pre-set on the magnetic strip at a predetermined position, or an opening for inserting the magnetic strip can be reserved on the mesh bag, and after the magnetic strip is inserted into the mesh bag through the opening, the opening is closed), and the mesh bag can be composed of a wire rope, a nylon wire or other materials, which are not limited by the embodiment of the present application.

[0057] As shown in Figure 8 , the fixing structure 322 can comprise a plurality of fixing structures 322 arranged on the support structure substrate layer 321 in the direction f1 away from the roll assembly 33, and the magnetic strip c21 is located in the fixing structure 322. Figure 8FIG. 2 is a structural schematic diagram of another projection screen provided by the embodiment of the present application, wherein the another fixing structure 322 comprises at least two fixing bands 3221, two ends of the fixing band 3221 are connected with the support structure substrate layer 321 respectively, the magnetic strip c21 passes through the at least two fixing bands 3221, and is fixed on the support structure substrate layer by the two fixing bands 3221. The at least two fixing bands 3221 can be distributed at multiple positions on the support structure substrate layer 321 in the transverse direction, so that the magnetic strip c21 can be firmly fixed on the support structure substrate layer 321. In an exemplary embodiment, the at least two fixing bands 3221 can comprise two fixing bands 3221 located at two ends of the magnetic strip c21. The two fixing bands 3221 located at the edges can avoid the ends of the magnetic strip c21 from being raised, thereby ensuring that the edges of the support structure substrate layer 321 are pressed on the projection screen by the ends of the magnetic strip c21 to support the edges of the projection screen, improving the flatness of the edges of the projection screen, and thereby improving the display effect of the projection screen. The fixing band 3221 can be formed by connecting two ends of the fixing band 3221 with the support structure substrate layer 321 (which can be connected by, for example, bonding or welding), that is, the fixing band 3221 that can fix the magnetic strip can be formed. The fixing band 3221 can be composed of a string, a nylon band, a cloth strip or other materials, and the embodiment of the present application does not limit this.

[0058] It should be noted that the fixing band 3221 located at the two ends of the magnetic strip c21 can also be provided with a blocking structure to prevent the magnetic strip c21 from sliding out of the fixing band 3221. For example, the blocking structure can comprise a blocking rope (or a blocking strip), one end of the blocking rope is connected with the fixing band 3221, the other end is wound outside the end of the magnetic strip c21, and is connected with the support structure substrate layer 321, or the blocking structure can comprise a glue layer on the side of the fixing band 3221 facing the magnetic strip c21, which can bond the magnetic strip c21 and the fixing band 3221, and also prevent the magnetic strip c21 from sliding out of the fixing band 3221. Of course, the two blocking structures can exist at the same time, that is, the end of the magnetic strip can be provided with a blocking rope, and the side of the fixing band 3221 facing the magnetic strip can also be provided with a glue layer, and the embodiment of the present application does not limit this.

[0059] In the projection screen provided by the embodiment of the present application, the support structure layer can be used to support the projection screen to prevent the projection screen from being curled in the unfolded state, and improve the flatness of the projection screen in the unfolded state. The support structure layer can have various structures to achieve the function of supporting the projection screen.

[0060] In an exemplary embodiment, as shown inFigure 9 is shown, Figure 9 is another structural schematic diagram of a projection screen provided by an embodiment of the present application, wherein the support structure layer 321 comprises a flexible substrate layer r1 and a support structure r2 on the flexible substrate layer r1, and the magnetic strip c21 is on the side of the flexible substrate layer r1 away from the projection curtain 31. The flexible substrate layer r1 serves as a buffer layer between the projection curtain 31 and the magnetic strip c21, and can further reduce the risk of mutual extrusion of the magnetic structures when directly contacted to damage the projection curtain, and improve the protection effect on the projection curtain.

[0061] The support structure r2 can be used to realize the support function of the support structure layer 321 on the projection screen 31, and the support structure r2 can have various structures. For example, the support structure r2 can comprise a plurality of hard strip structures (such a structure is shown), which can be arranged on the flexible substrate layer r1 in a direction f1 away from the roll assembly 33, and the length direction of the strip structure can be parallel to the axis z1 of the roll assembly 33. Figure 9

[0062] Thus, a soft and hard combined support structure layer is provided, which can support the projection curtain by the hard strip structure when the projection screen is unfolded, so as to improve the flatness of the projection curtain, especially the flatness of the two edges of the projection screen in the transverse direction, so as to improve the display effect of the image picture carried by the projection screen. When the projection screen is stored, the flexible substrate layer can have good bending performance, and the hard strip structure can be curled with the flexible substrate layer and the projection curtain and wound on the roll assembly because the length direction of the hard strip structure is parallel to the axis of the roll assembly, and the hard strip structure will not exert a large pressure on the projection curtain, thereby protecting the projection curtain and improving the service life of the projection screen.

[0063] In addition, since the base of the projection screen is the flexible substrate layer, and the length direction of the hard strip structure is parallel to the axis of the roll assembly and is located on the side of the flexible substrate layer away from the projection curtain, the hard support strip will not affect the curling of the projection screen when the projection screen is curled, thereby improving the curling performance of the projection screen, reducing the curling radius of the projection screen, and facilitating the miniaturization of the projection screen.

[0064] It should be noted that the plurality of hard strip structures can have a spacing between adjacent strip structures, which can be determined by experiments, so that the flatness of the projection curtain can be ensured with as few strip structures as possible.

[0065] ​In an exemplary embodiment, the material of the flexible substrate layer r1 includes at least one of synthetic cloth, polyethylene terephthalate (PET), and polyimide (PI).

[0066] In addition, the material of the rigid strip structure includes various rigid materials, such as carbon fiber, glass fiber, aluminum alloy, polycarbonate (PC), and the like.

[0067] In an exemplary embodiment, the plurality of magnetic strips and the plurality of rigid strip structures are arranged in a plurality of strip groups on the flexible substrate layer, each strip group including at least one magnetic strip and at least one rigid strip structure. In this structure, the magnetic strip can also be made of a rigid material, so that the magnetic strip can not only be used to be attracted to the second magnetic structure in the projection screen, but also can be used to support the edge of the projection screen together with the rigid strip structure, so as to improve the flatness of the edge of the projection screen.

[0068] Figure 9 It is shown that a strip group includes one magnetic strip c21 and one rigid strip structure, but a strip group can also include other numbers of magnetic strips and rigid strip structures, and the number of magnetic strips and the number of rigid strip structures in a strip group can be the same or different, and the number of magnetic strips and the number of rigid strip structures in different strip groups can be the same or different. For example, a strip group can include two magnetic strips and two rigid strip structures, or a strip group can include two magnetic strips and one rigid strip structure, or in a plurality of strip groups, one strip group can include two magnetic strips and one rigid strip structure, and another strip group can include two magnetic strips and two rigid strip structures, and the embodiments of the present application do not limit this.

[0069] In another exemplary embodiment, the material of the rigid strip structure in the support structure layer can include a magnetic material, that is, the plurality of rigid strip structures can also achieve the function of magnetic attraction, and the magnetic strips in the second magnetic structure can be distributed together with the rigid strip structures on the flexible substrate layer, improving the stability of the attraction between the support structure layer and the projection screen. On the one hand, it can avoid the disengagement of the projection screen and the support structure layer when the projection screen is rolled up or unfolded, and on the other hand, it can improve the support effect of the support structure layer on the projection screen, improve the flatness of the edge of the projection screen, and improve the display effect of the projection screen.

[0070] In the above embodiments, the strip-shaped structure for supporting and the magnetic strip are arranged on the flexible substrate layer in a spaced manner, but the magnetic strip and the strip-shaped structure can also be arranged in a stacked manner on the flexible substrate layer. For example, the strip-shaped structure can be arranged on the flexible substrate layer, and the magnetic strip can be arranged on the strip-shaped structure in a stacked manner (in this structure, the strip-shaped structure can be made of a material that does not affect the magnetic field, so as to avoid shielding the magnetic field of the magnetic strip and affecting the support of the support structure layer on the projection screen), or the magnetic strip can be arranged on the flexible substrate layer, and the strip-shaped structure can be arranged on the magnetic strip in a stacked manner.

[0071] Figure 10 FIG. 6 is a structural schematic diagram of another projection screen provided by an embodiment of the present application, wherein the second magnetic structure c2 includes a first magnetic sub-structure c2a and a second magnetic sub-structure c2b, the orthographic projection of the first magnetic sub-structure c2a on the projection screen 31 is in contact with the edge region q1 of the projection screen 31, the second magnetic sub-structure c2b has a spacing between the orthographic projection of the second magnetic sub-structure c2b on the projection screen 31 and the edge region q1 of the projection screen 31, the magnetic property of the first magnetic sub-structure c2a is greater than the magnetic property of the second magnetic sub-structure c2b, and the edge region q1 is a region including the edge of the projection screen 31 (the edge can refer to two edges in the lateral direction f3).

[0072] Since the edge of the projection screen 31 is more likely to curl, the magnetic property of the magnetic sub-structure in the region where the edge is located is greater than the magnetic property of the magnetic sub-structure in the region other than the edge, the tightness of the enhanced support structure layer at the edge of the projection screen is enhanced, the support effect of the support structure layer on the projection screen at the edge is improved, and the flatness of the edge region of the projection screen in the unfolded state is further improved.

[0073] Figure 11 FIG. 7 is a structural schematic diagram of another projection screen provided by an embodiment of the present application, wherein the support structure layer 321 includes a roller blind assembly w, the roller blind assembly w includes a plurality of roller blind pieces w1 connected in sequence in a direction away from a roller assembly, and the second magnetic structure c2 is located on a side of the roller blind assembly w away from the projection screen 31. The structure in which the plurality of roller blind pieces w1 are connected at the head and the tail can not only realize the support function of the projection screen 31, but also facilitate the winding of the projection screen 31 into the roller assembly 33.

[0074] In an exemplary embodiment, part of the structure of the roller blind piece w1 in the roller blind assembly w can be a flexible structure, and another part of the structure can be a hard structure. In this way, part of the roller blind pieces constituting the roller blind assembly has a certain flexibility, so that the pressure applied by the roller blind assembly to the projection screen can be reduced when the projection screen is curled, the risk of damage to the projection screen due to extrusion is reduced, and the protection effect on the projection screen is improved.

[0075] In addition, some of the roller blind slats in the roller blind assembly have a certain degree of flexibility, which can improve the rolling ability of the roller blind assembly, reduce the rolling radius of the projection screen, and facilitate the miniaturization of the projection screen.

[0076] When the support structure layer 321 includes a roller blind assembly w, the second magnetic structure c2 can be fixed to the roller blind assembly w in various ways. In one exemplary embodiment, the second magnetic structure c2 is adhered to the side of the roller blind assembly w away from the projection screen 31. Alternatively, the projection screen may also include multiple screws, with multiple roller blind slats in the roller blind assembly having screw holes. The multiple screws pass through the second magnetic structure and are threaded into the screw holes to fix the second magnetic structure to the roller blind assembly. Alternatively, the projection screen may also include a clamping component that fixes the second magnetic structure to the roller blind assembly.

[0077] In summary, the projection screen provided in this application embodiment, by setting the second magnetic structure on the side of the support structure layer away from the projection screen, and by having the second magnetic structure attract the first magnetic structure set on the projection screen component, allows the projection screen to adhere to the support structure layer, and the support structure layer supports the projection screen. Since the two magnetic structures do not directly contact each other, the support structure layer located between the two magnetic structures can act as a buffer layer to reduce the risk of damage to the projection screen when the magnetic structures directly contact each other. This solves the problem of easy damage to the projection screen in related technologies and improves the protection effect of the projection screen.

[0078] In addition, by reducing the pressure exerted on the projection screen by the two magnetic structures, the problem of creases on the projection screen under this pressure can be avoided, which can improve the flatness of the projection screen after it is unfolded, thereby improving the display effect of the projection screen.

[0079] like Figure 12 As shown, Figure 12 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application. The projection device includes a projector 40 and any of the projection screens 30 provided in the above embodiments.

[0080] When using this projection device, the projection screen 31 and the support structure layer 32, which are rolled up and stored in the roll assembly 33, can be pulled out from the roll assembly 33 and fixed. Then the projector 41 can be turned on, and the projector 41 can project the image onto the projection screen 31.

[0081] In conclusion, the projection device provided by the embodiment of the present application comprises a projector and a projection screen. The second magnetic structure is arranged on the side of the support structure layer away from the projection curtain, and the second magnetic structure and the first magnetic structure arranged on the projection curtain spare part are mutually adsorbed, so that the projection curtain is attached to the support structure layer and supported by the support structure layer. Since the two magnetic structures are not in direct contact, the support structure layer between the two magnetic structures can act as a buffer layer to reduce the risk of mutual extrusion of the magnetic structures when they are in direct contact to damage the projection curtain. The problem of easy damage of the projection screen in the related art is solved, and the protection effect of the projection screen is improved.

[0082] In addition, since the pressure applied by the two magnetic structures to the projection screen is reduced, the problem of creases in the projection screen under the action of the pressure can be avoided, the flatness of the projection curtain after being unfolded can be improved, and the display effect of the projection screen can be improved.

[0083] In the present application, the term "at least one of A and B" is merely a description of the associated relationship of the associated objects, indicating that there can be three relationships, for example, at least one of A and B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone. Similarly, "at least one of A, B and C" indicates that there can be seven relationships, which can represent seven cases: A exists alone, B exists alone, C exists alone, A and B exist simultaneously, A and C exist simultaneously, C and B exist simultaneously, and A, B and C exist simultaneously. Similarly, "at least one of A, B, C and D" indicates that there can be fifteen relationships, which can represent fifteen cases: A exists alone, B exists alone, C exists alone, D exists alone, A and B exist simultaneously, A and C exist simultaneously, A and D exist simultaneously, C and B exist simultaneously, D and B exist simultaneously, C and D exist simultaneously, A, B and C exist simultaneously, A, B and D exist simultaneously, A, C and D exist simultaneously, B, C and D exist simultaneously, and A, B, C and D exist simultaneously.

[0084] It should be noted that in the drawings, the sizes of the layers and regions can be exaggerated for clarity. Moreover, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer, or intervening layers can also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or layer, or one or more intervening layers or elements can also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer or element between the two layers or elements, or one or more intervening layers or elements can also be present. Similar reference numerals indicate similar elements throughout the specification.

[0085] In the present application, the terms "first", "second" are only used for descriptive purpose and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise expressly specified.

[0086] The above description is only optional embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A projection screen, characterized by The projection screen comprises a projection curtain, a first magnetic structure, a second magnetic structure, a support structure layer and a reel assembly; The first magnetic structure is arranged on the back of the projection curtain, the second magnetic structure is arranged on one side of the support structure layer, the other side of the support structure layer is attached to the side of the first magnetic structure away from the projection curtain, and the second magnetic structure and the first magnetic structure are mutually adsorbed. One end of the projection curtain and the support structure layer is connected with the reel assembly.

2. The projection screen of claim 1, wherein, The second magnetic structure comprises a plurality of magnetic strips, and the plurality of magnetic strips are arranged on the support structure layer in a direction away from the reel assembly.

3. The projection screen of claim 2, wherein, The support structure layer comprises a support structure substrate layer and a plurality of fixing structures, the plurality of fixing structures are arranged on the support structure substrate layer in a direction away from the reel assembly, and the plurality of magnetic strips are correspondingly arranged in the plurality of fixing structures.

4. The projection screen of claim 3, wherein, The fixing structure comprises a net bag, and the magnetic strip is arranged in the net bag. Alternatively, the fixing structure comprises at least two fixing belts, two ends of the fixing belt are respectively connected with the support structure substrate layer, the magnetic strip passes through the at least two fixing belts, and the magnetic strip is fixed on the support structure substrate layer by the at least two fixing belts.

5. The projection screen of claim 2, wherein, The support structure layer comprises a flexible substrate layer and a support structure arranged on the flexible substrate layer, and the magnetic strip is arranged on the side of the flexible substrate layer away from the projection curtain.

6. The projection screen of claim 5, wherein, The material of the flexible substrate layer comprises at least one of synthetic cloth, polyethylene terephthalate and polyimide.

7. The projection screen of claim 1, wherein, The support structure layer comprises a roller blind assembly, the roller blind assembly comprises a plurality of roller blind pieces which are sequentially and movably connected in a direction away from the reel assembly, and the second magnetic structure is arranged on the side of the roller blind assembly away from the projection curtain.

8. The projection screen of claim 7, wherein, The second magnetic structure is pasted on the side of the roller blind assembly away from the projection curtain. Alternatively, the projection screen further comprises a plurality of screws, a plurality of roller blind pieces in the roller blind assembly are provided with screw holes, the plurality of screws pass through the second magnetic structure and are threadedly connected with the screw holes to fix the second magnetic structure on the roller blind assembly. Alternatively, the projection screen further comprises a holding assembly, and the holding assembly fixes the second magnetic structure on the roller blind assembly.

9. The projection screen of claim 1, wherein, The second magnetic structure comprises a first magnetic substructure and a second magnetic substructure, the orthographic projection of the first magnetic substructure on the projection curtain is located in an edge region of the projection curtain, the orthographic projection of the second magnetic substructure on the projection curtain has a spacing between the edge region of the projection curtain, the magnetic property of the first magnetic substructure is greater than that of the second magnetic substructure, and the edge region is a region including the edge of the projection curtain.

10. A projection apparatus, characterized by, The projection device comprises a projector and the projection screen according to any one of claims 1 to 9.

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