Projection screen and projection system

Abstract

The invention provides a projection screen and a projection system, and the projection screen comprises a display diaphragm which is provided with a projection light-receiving surface; the support unit comprises a supporting seat and a roller, the roller is rotationally arranged on the supporting seat, and at least part of the display diaphragm is arranged on the periphery of the roller in a rolling mode; the guiding unit is configured to be movably arranged on the supporting base, the guiding unit comprises a guiding piece and at least two tensioning pieces, the at least two tensioning pieces are located at the two opposite ends of the guiding piece in the length direction of the guiding piece, and the tensioning pieces are used for providing variable tensioning force for the guiding piece; and an included angle is formed between the moving direction of the guide piece and the moving direction of the display diaphragm. The problems that the display diaphragm shakes and the tension degree of the display diaphragm is loose in the lifting process of the display diaphragm are solved, and then the use experience of a user is improved.

Description

TECHNICAL FIELD

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

[0002] With the continuous development of society, people's pursuit is also changing. For laser television, the lightweight and simplicity of the screen have become a pursuit index for people. The lifting and winding projection screen is a main direction of differentiation between projection display and traditional flat display due to its small size, convenient transportation and installation, and good integration with home environment.

[0003] Currently, during the prototype testing process, it is found that due to the unevenness of the coil spring force and the certain hysteresis of the change, the coil spring cannot always be pulled tight during the lifting process, especially during the descending process, which causes the screen to start to relax and shake, seriously affecting the viewing experience.

[0004] The foregoing narrative is to provide general background information and does not necessarily constitute the prior art.

[0005] SUMMARY

[0006] The main purpose of the present application is to provide a projection screen and a projection system, which improves the display film shaking and display film tension relaxation problems generated during the display film lifting process, and further improves the user's experience.

[0007] To achieve the above purpose, in a first aspect, the present application provides a projection screen, comprising:

[0008] a display film, the display film having a projection light receiving surface;

[0009] a support unit, the support unit comprising a support seat and a roller, the roller being rotatably arranged on the support seat, and at least part of the display film being wound on the outer periphery of the roller;

[0010] a guide unit configured to be movably arranged on the support seat, the guide unit comprising a guide piece and at least two tensioning pieces, the at least two tensioning pieces being located at opposite ends of the guide piece in the length direction of the guide piece, the tensioning pieces being used to provide variable tensioning force to the guide piece, when the display film is lifted, the tensioning pieces provide a first tensioning force to the guide piece, the guide piece moves in the direction close to the roller under the action of the first tensioning force, so that the guide piece abuts against the wall surface of the display film;

[0011] When the display film is lowered, the tensioning pieces provide a second tensioning force to the guide piece, the guide piece moves in the direction away from the roller under the action of the second tensioning force, so that the guide piece abuts against the wall surface of the display film;

[0012] The first tensioning force is greater than the second tensioning force, and the moving direction of the guide member and the moving direction of the display film have an included angle.

[0013] The beneficial effects of the present application are as follows: through the matching arrangement of the guide member and the tensioning member, the tensioning member provides tensioning force to the guide member during the lifting or lowering of the display film, the guide member can be moved relative to the cylinder at any time under the action of the tensioning member, the guide member is always in contact with the display film during the movement of the display film, the display film is always in a relatively tight state, the shaking degree is reduced, the tensioning force can be adjusted in real time according to the actual shaking of the sample machine, the tensioning force is adjusted in real time, and after the adjustment is completed, the appropriate position is locked and fixed to provide stability. At the same time, it has mass production, reduces the adjustment difficulty and adjustment time, and further prevents the display film from shaking left and right during the movement, thereby affecting the viewing effect of the user.

[0014] On the basis of the above technical solutions, the present application can also be improved as follows.

[0015] In some optional embodiments, when the display film is lowered to the lowest point, the tensioning member provides a third tensioning force to the guide member, and the third tensioning force is less than the second tensioning force.

[0016] When the display film is lifted to the highest point, the tensioning member provides a fourth tensioning force to the guide member, and the fourth tensioning force is greater than the first tensioning force.

[0017] In some optional embodiments, the guide member and the cylinder are located on the same side of the display film.

[0018] In some optional embodiments, the guide member is a rotating shaft, the guide member is arranged to rotate around its own axis, and the axis direction of the guide member is consistent with the axis direction of the cylinder.

[0019] In some optional embodiments, the display film abuts against the side of the guide member away from the cylinder.

[0020] In some optional embodiments, the guide unit further comprises an elastic member and a guide pin, the guide pin is cylindrical, and the elastic member is a compression spring.

[0021] The elastic member surrounds the outer periphery of the guide pin, one end of the elastic member abuts against the end of the guide pin, the other end of the elastic member abuts against the outer side wall of the guide member, the guide pin passes through the opening of the guide member and is connected with the tensioning member.

[0022] In some optional embodiments, a moving groove is formed on the support seat, and the moving groove is arranged to extend along the moving direction of the tensioning member.

[0023] The structure of the tensioning member matches the structure of the moving groove, the tensioning member is located in the moving groove, and moves in the moving groove.

[0024] In some optional embodiments, the tensioning member is in a block structure.

[0025] The guide unit further comprises a first adjusting member, and an adjusting groove is formed on the tensioning member, the adjusting groove is located on the side of the tensioning member away from the guide member, the extending direction of the adjusting groove is consistent with the extending direction of the moving groove, the first adjusting member passes through the adjusting groove and moves in the adjusting groove to adjust the position of the tensioning member in the moving groove.

[0026] In some optional embodiments, the guide unit further comprises a second adjusting member, and the second adjusting member is a lead screw.

[0027] A threaded hole matched with the second adjusting member is formed on the tensioning member, the threaded hole is located on the side of the tensioning member away from the elastic member, and the second adjusting member is screwed into the threaded hole, and when the second adjusting member rotates around its axis, the tensioning member is driven to move.

[0028] In some optional embodiments, the guide unit further comprises a support shaft, and the slot opening section of the moving groove extends to the end of the tensioning member, and in the moving direction of the display film, the size of the slot opening section of the moving groove is smaller than the size of the slot bottom section of the moving groove.

[0029] The first end of the support shaft is connected with the end of the guide member, and the second end of the support shaft extends into and moves in the slot opening section of the moving groove.

[0030] In a second aspect, the present application further provides a projection screen, comprising:

[0031] a display film, the display film having a projection light receiving surface;

[0032] a roller, at least part of the display film is wound on the outer periphery of the roller;

[0033] a guide member and a tensioning member, the tensioning member is used to provide a tensioning force to the guide member, and when the display film moves, the guide member moves relative to the roller to abut against the wall surface of the display film.

[0034] In a third aspect, the present application further provides a projection system, comprising a projection device and the projection screen described above, and the projection device is used to project a projection picture to the projection screen.

[0035] The projection screen and the projection system provided in the application, the projection system comprises a projection device and a projection screen, the projection device is used for projecting a projection picture to the projection screen; wherein the projection screen comprises: a display film piece, the display film piece has a projection light receiving surface; a support unit, the support unit comprises a support seat and a roller, the roller is rotationally arranged on the support seat, and at least part of the display film piece is wound on the outer periphery of the roller; a guide unit, the guide unit is movably arranged on the support seat, the guide unit comprises a guide piece and at least two tensioning pieces, the at least two tensioning pieces are located at opposite ends of the guide piece in the length direction of the guide piece, the tensioning pieces are used for providing variable tensioning forces to the guide piece, when the display film piece rises, the tensioning pieces provide a first tensioning force to the guide piece, the guide piece moves in the direction close to the roller under the action of the first tensioning force, so that the guide piece abuts against the wall surface of the display film piece; when the display film piece descends, the tensioning pieces provide a second tensioning force to the guide piece, the guide piece moves in the direction away from the roller under the action of the second tensioning force, so that the guide piece abuts against the wall surface of the display film piece; wherein the first tensioning force is greater than the second tensioning force, and there is an included angle between the moving direction of the guide piece and the moving direction of the display film piece.

[0036] Through the matched arrangement of the guide piece and the tensioning piece, in the process of the rising or descending of the display film piece, the tensioning piece provides a tensioning force to the guide piece, the guide piece can be pushed at any time, so that the guide piece can move relative to the roller under the action of the tensioning piece, the guide piece is always in contact with the display film piece in the moving process of the display film piece, the display film piece is always in a relatively tight state, the shaking degree is reduced, the size of the tensioning force can be adjusted in real time according to the actual shaking situation of the sample machine, so as to realize real-time adjustment of the tensioning force, and after the adjustment is completed, the appropriate position is locked and fixed to provide stability, meanwhile, the production is realized, the adjustment difficulty and the adjustment working hours are reduced, and then the left and right shaking of the display film piece in the moving process is prevented, and the viewing effect of the user is affected. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative labor under the premise of the drawings.

[0038] Figure 1 A structural schematic diagram of a first state of a projection screen provided by the embodiment of the application;

[0039] Figure 2 An assembly schematic diagram of the roller and the display film piece provided by the embodiment of the application;

[0040] Figure 3A side view of the projection screen provided by the embodiment of the present application;

[0041] Figure 4 A schematic view of the display film rising and falling state in the projection screen provided by the embodiment of the present application;

[0042] Figure 5 An assembly schematic view of the display film and the guide unit in the projection screen provided by the embodiment of the present application;

[0043] Figure 6 A structure schematic view of the first view angle in the second state of another projection screen provided by the embodiment of the present application;

[0044] Figure 7 An assembly schematic view of the support unit and the guide unit in the projection screen provided by the embodiment of the present application;

[0045] Figure 8 An exploded schematic view of the assembly of the support unit and the guide unit in the projection screen provided by the embodiment of the present application;

[0046] Figure 9 A structure schematic view of the second view angle in the second state of another projection screen provided by the embodiment of the present application;

[0047] Figure 10 A structure schematic view of the projection system provided by the embodiment of the present application; Figure 9 A local enlarged view at I in the structure schematic view of the projection system provided by the embodiment of the present application;

[0048] Figure 11 A structure schematic view of the projection system provided by the embodiment of the present application;

[0049] Explanation of reference signs:

[0050] 100-projection screen; 110-display film; 111-optical film; 112-flexible carrier; 1121-first edge; 1122-second edge;

[0051] 120-support unit; 121-support seat; 1211-moving groove; 122-roller; 123-lifting piece; 1231-first lifting frame; 12311-first lifting rod; 12312-second lifting rod; 1232-second lifting frame; 12321-third lifting rod; 12322-fourth lifting rod; 124-cross beam;

[0052] 130-guide unit; 131-first adjusting piece; 132-second adjusting piece; 133-guiding piece; 134-tensioning piece; 1341-adjusting groove; 135-elastic piece; 136-guiding pin; 137-support shaft; 138-rotating bearing; 139-fixed top screw;

[0053] 200 - projection system; 210 - projection device; 211 - housing; 2111 - light transmission area; 2112 - opening. DETAILED DESCRIPTION

[0054] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application. All other embodiments obtained are within the scope of the present application. The embodiments described below and the features in the embodiments can be combined with each other in the case of no conflict.

[0055] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connection", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless specifically defined otherwise. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0057] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0058] At present, it is found in the prototype test process that, due to the uneven spring force and the certain hysteresis of the change, the spring cannot completely match the motor descending process, resulting in that the screen cannot be always pulled tight during the lifting and descending process (especially the descending process), at this time, the screen begins to relax and shake, which seriously affects the viewing experience.

[0059] In order to overcome the defects in the prior art, the projection screen and the projection system provided by the application are matched by the guide member and the tensioning member, the tensioning member provides the tensioning force to the guide member during the lifting or descending process of the display diaphragm, the guide member can be moved relative to the cylinder under the action of the tensioning member at any time, the guide member is always in contact with the display diaphragm during the movement of the display diaphragm, the display diaphragm is always in a relatively tight state, the shaking degree is reduced, the size of the tensioning force can be adjusted in real time according to the actual shaking condition of the prototype, the real-time adjustment of the tensioning force is realized, after the adjustment is completed, the appropriate position is selected to be locked and fixed, so as to provide stability, meanwhile, the production is provided, the adjustment difficulty and the adjustment time are reduced, and then the display diaphragm is prevented from shaking left and right during the movement, so as to affect the viewing effect of the user.

[0060] The content of the application will be described in detail below with reference to the drawings, so that those skilled in the art can more clearly and specifically understand the content of the application.

[0061] Figure 1 A structure schematic view of a first state of a projection screen provided by an embodiment of the application, Figure 2 An assembly schematic view of a cylinder and a display diaphragm provided by an embodiment of the application, Figure 3 A side view of a projection screen provided by an embodiment of the application, Figure 4 A schematic view of the lifting and descending states of a display diaphragm in a projection screen provided by an embodiment of the application, Figure 5 An assembly schematic view of a display diaphragm and a guide unit in a projection screen provided by an embodiment of the application, Figure 6 A structure schematic view of a first view angle in a second state of another projection screen provided by an embodiment of the application, Figure 7 An assembly schematic view of a support unit and a guide unit in a projection screen provided by an embodiment of the application, Figure 8 An exploded schematic view of the assembly of a support unit and a guide unit in a projection screen provided by an embodiment of the application.

[0062] As Figures 1 to 8 shown, an embodiment of the application provides a projection screen 100, which comprises:

[0063] A display diaphragm 110, the display diaphragm 110 has a projection light receiving surface;

[0064] The support unit 120 comprises a support base 121 and a roller 122, the roller 122 is rotationally arranged on the support base 121, and the display film 110 is at least partially wound on the outer periphery of the roller 122;

[0065] The guide unit 130 is movably arranged on the support base 121, and the guide unit 130 comprises a guide piece 133 and at least two tensioning pieces 134, the at least two tensioning pieces 134 are located at opposite ends of the guide piece 133 in the length direction of the guide piece 133, and the tensioning pieces 134 are used to provide variable tensioning force to the guide piece 133;

[0066] When the display film 110 is raised, the tensioning pieces 134 provide the first tensioning force to the guide piece 133, and the guide piece 133 moves in the direction close to the roller 122 under the action of the first tensioning force, so that the guide piece 133 abuts against the wall surface of the display film 110;

[0067] When the display film 110 is lowered, the tensioning pieces 134 provide the second tensioning force to the guide piece 133, and the guide piece 133 moves in the direction away from the roller 122 under the action of the second tensioning force, so that the guide piece 133 abuts against the wall surface of the display film 110;

[0068] The first tensioning force is greater than the second tensioning force, and the guide piece 133 has an included angle with the moving direction of the display film 110.

[0069] Through the above arrangement, that is, through the matching arrangement of the guide piece 133 and the tensioning piece 134, the tensioning piece 134 provides the tensioning force to the guide piece 133 during the raising or lowering of the display film 110, and can always push the guide piece 133, so that the guide piece 133 can move relative to the roller 122 under the action of the tensioning piece 134, and the guide piece 133 is always in contact with the display film 110 during the movement of the display film 110, so as to ensure that the display film 110 is always in a relatively tight state, reduce the shaking degree, and the size of the tensioning force can be adjusted in real time according to the actual shaking situation of the sample machine, so as to realize real-time adjustment of the tensioning force, and after the adjustment is completed, the appropriate position is locked and fixed to provide stability, while having mass production, reducing the adjustment difficulty and adjustment time, and further ensuring that the display film 110 is prevented from shaking left and right during the movement, and affecting the viewing effect of the user.

[0070] It should be noted that the projection screen 100 provided by the embodiment of the present application is a screen that can be curled and raised and lowered.

[0071] In addition, it should be noted that the projection screen 100 provided by the embodiments of the present application can be a pull-down projection screen 100, or can be a pull-up projection screen 100. When the projection screen 100 is a pull-down projection screen 100, the user can pull the projection screen 100 out of the roller 122 from top to bottom after the projection screen 100 is set at a preset position. When the projection screen 100 is a pull-up projection screen 100, the user can pull the projection screen 100 out of the roller 122 from bottom to top after the projection screen 100 is set at a preset position. In this case, the pulled-out projection screen 100 can be fixed at the preset position (for example, a hook on a wall, or a support structure layer through a bracket).

[0072] In the embodiments of the present application, the display film 110 is wound up by the controller when the projection device is not used, so as to reduce the space occupied by the display film 110. When the projection device is used, the display film 110 is unwound by the controller, so as to reflect the light beams emitted by the optical engine and display the picture.

[0073] It should be noted that the following will be specifically described for each structure.

[0074] [Display film 110]

[0075] It should be noted that the front surface of the display film 110 can be used to display the projection picture.

[0076] It should be noted that the display film 110 provided by the embodiments of the present application can include an unwound state and a storage state. The unwound state refers to a state in which the display film 110 is unwound outside the roller 122 without being wound on the roller 122, and the storage state refers to a state in which the display film 110 is wound on the roller 122. Of course, the display film 110 can also be partially wound on the roller 122, which is not limited by the embodiments of the present application.

[0077] It should be noted that when the display film 110 is wound up, the display film 110 can be wound on the roller 122.

[0078] The material of the display film 110 can include polyethylene terephthalate (English: Polyethyleneterephthalate; abbreviation: PET). When the display film 110 is wound on the roller 122, the display film 110 is wound on the roller 122 in multiple layers.

[0079] In some embodiments, as Figure 2As shown, the display film 110 includes an optical film 111 and a flexible carrier 112. A surface of the optical film 111 away from the display area (e.g., the back side) is fixed to the flexible carrier 112. A first side 1121 and a second side 1122 on the flexible carrier 112 are respectively fixedly connected to a roller 122 and a lifting member 123. Thus, the flexible carrier 112 enables the connection between the display film 110 and the roller 122 and the lifting member 123, and also provides support for the optical film 111.

[0080] It should be noted that when using the optical film 111, only the area illuminated by the corresponding projection beam displays the image. Therefore, an optical film 111 with an area equal to the area illuminated by the corresponding projection beam can be used, which can reduce the cost of the display film 110. For example, the size of the optical film 111 is 66 mm * 9 mm.

[0081] The flexible carrier 112 is made of a material that is not easily deformed and has high tensile strength, so as to ensure the curling of the flexible carrier 112 and avoid the deformation of the flexible carrier 112 under the action of external force. For example, the flexible carrier 112 is a synthetic fabric made of polyester filaments that is not easily deformed and has high tensile strength.

[0082] The dimension of the optical film 111 along the length of the roller 122 is smaller than the dimension of the flexible carrier 112 along the length of the roller 122. In this way, when the flexible carrier 112 is fixed to the optical film 111 (e.g., bonded), the edge of the optical film 111 can be prevented from protruding from the flexible carrier 112, thereby achieving effective fixation of each part of the optical film 111.

[0083] Of course, in some embodiments, such as Figure 2 As shown, the dimension of the optical film 111 along the length of the roller 122 can also be equal to the dimension of the flexible carrier 112 along the length of the roller 122. This facilitates alignment of the edge of the optical film 111 with the edge of the flexible carrier 112 when fixing the optical film 111, and helps reduce the size of the display film 110 when the size of the optical film 111 is fixed. Furthermore, when displaying an image, the display film 110 leaves no blank space along the length of the roller 122, which helps improve the image display effect of the display film 110.

[0084] [Support Unit 120]

[0085] The support unit 120 includes a support base 121 and a roller 122. The support base 121 is mainly used to support the roller 122. The roller is rolled on the support base 121. The support base 121 provides a certain rotation space for the roller 122. In addition, the rotation space is larger than the size of the roller 122, so that the display film 110 can be rolled on the outer periphery of the roller 122.

[0086] In some examples, the support base 121 can be a metal piece, and the material thereof can include one or more of copper, iron, aluminum, tin, and lead.

[0087] In other examples, the support base 121 can be made of plastic.

[0088] It should be noted that the material of the support base 121 is not limited herein.

[0089] Of course, in the production process, the support base 121 can also be made of steel plate, plastic, or synthetic material under the premise of ensuring strength.

[0090] In some examples, the roller 122 and the support base 121 can be connected in a detachable or fixed manner.

[0091] For example, the roller 122 and the support base 121 can be connected by bolts, buckles, or hanging.

[0092] In some examples, as shown in FIG. 1, the support unit 120 further includes a lifting piece 123, and the lifting piece 123 includes a first lifting frame 1231 and a second lifting frame 1232. Figure 1

[0093] The first lifting frame 1231 includes a first lifting rod 12311 and a second lifting rod 12312, two ends of the first lifting rod 12311 are rotatably connected with the base and the cross beam 124, and the first lifting rod 12311 is arranged along a side edge of the display film 110 when the display film 110 is unfolded. The first end of the second lifting rod 12312 is rotatably connected with the first lifting rod 12311, and the second end of the second lifting rod 12312 is slidably connected with the base.

[0094] The second lifting frame 1232 includes a third lifting rod 12321 and a fourth lifting rod 12322, two ends of the third lifting rod 12321 are rotatably connected with the base and the cross beam 124, and the third lifting rod 12321 is arranged along another side edge of the display film 110 when the display film 110 is unfolded. The first end of the fourth lifting rod 12322 is rotatably connected with the third lifting rod 12321, and the second end of the fourth lifting rod 12322 is slidably connected with the base.

[0095] ​The first lifting rod 12311 is located at the first end of the first lifting frame 1231 on one side of the base, the second lifting rod 12312 is located at the second end of the first lifting frame 1231 on one side of the base, the third lifting rod 12321 is located at the first end of the second lifting frame 1232 on the other side of the base, and the fourth lifting rod 12322 is located at the second end of the second lifting frame 1232 on the other side of the base. When the first lifting rod 12311 and the third lifting rod 12321 are lowered, the second lifting rod 12312 and the fourth lifting rod 12322 move towards each other.

[0096] Specifically, when the second end of the second lifting rod 12312 and the second end of the fourth lifting rod 12322 are close to each other, the first end of the second lifting rod 12312 and the first end of the fourth lifting rod 12322 drive the first lifting rod 12311 and the third lifting rod 12321 to fold, thereby realizing the folding of the display film 110. When the second end of the second lifting rod 12312 and the second end of the fourth lifting rod 12322 are away from each other, the second lifting rod 12312 and the fourth lifting rod 12322 can respectively support the first lifting rod 12311 and the third lifting rod 12321, so that the first lifting rod 12311 and the third lifting rod 12321 are both supported (or unfolded) as a long strip structure.

[0097] Since the first lifting rod 12311 and the third lifting rod 12321 are both in a long strip structure, it is beneficial for the first lifting rod 12311 and the third lifting rod 12321 to better fit the first part close to the side edge of the display film 110 and the second part close to the other side edge of the display film 110, so as to realize the effective fixation of the first lifting rod 12311 and the third lifting rod 12321 to the opposite sides of the display film 110.

[0098] Taking the first lifting frame 1231 as an example, since the first lifting rod 12311 and the second lifting rod 12312 included in the first lifting frame 1231 need to be fitted on the back of the display film 110 after being supported, the first lifting rod 12311 and the second lifting rod 12312 will continue to contact the back of the display film 110 when being supported, so as to have a smoothing operation from the center to the side edge of the display film 110 when being supported, thereby further ensuring the flatness of the display film 110 after being unfolded.

[0099] In an exemplary embodiment, the projection screen 100 provided by the embodiment of the present application can further include a cross beam 124, which can be located at the other end of the projection screen 100 opposite to the roller 122, and can be used to support the end of the projection screen 100.

[0100] [Guiding unit 130]

[0101] As Figures 1 to 8As shown, with the change of the drum diameter during the lifting of the display film 110, the guide 133 can be out of contact with the display film 110. As shown in FIG. 1C, with the lowering of the display film 110, the drum diameter gradually increases, and the position of the display film 110 gradually moves away from the guide 133. Therefore, the tensioning member 134 provides a tensioning force to the guide 133, so that the guide 133 moves relative to the drum 122, and thus keeps close to the display film 110 during the movement of the display film 110, preventing the display film 110 from shaking during the movement. Figure 4 As shown, with the change of the drum diameter during the lifting of the display film 110, the guide 133 can be out of contact with the display film 110. As shown in FIG. 1C, with the lowering of the display film 110, the drum diameter gradually increases, and the position of the display film 110 gradually moves away from the guide 133. Therefore, the tensioning member 134 provides a tensioning force to the guide 133, so that the guide 133 moves relative to the drum 122, and thus keeps close to the display film 110 during the movement of the display film 110, preventing the display film 110 from shaking during the movement.

[0102] It should be noted that the guide 133 is always in contact with the display film 110 during the movement of the display film 110, and has a certain abutting force on the display film 110.

[0103] In the embodiments of the present application, when the projection device is not used, the display film 110 is rolled up by the controller, so as to reduce the space occupied by the display film 110. When the projection device is used, the display film 110 is unrolled by the controller, so as to reflect the light beam emitted by the optical engine and display the picture.

[0104] When the display film 110 is in the unrolled or rolled-up state, the guide 133 is pressed on the display film 110 at any time under the pushing of the tensioning member 134, so that the display film 110 is always in contact with the display film 110 during the movement of the display film 110, and thus prevents the display film 110 from shaking left and right. When the display film 110 is in the unrolled state, the guide 133 is pressed on the display film 110, which can avoid the picture displayed on the display film 110 from being distorted, blurred, distorted, and the like, thereby improving the display effect of the projection screen 100.

[0105] In addition, A represents the moving direction of the guide 133, and Y represents the moving direction of the display film 110.

[0106] Figure 9 FIG. 2B is a structural schematic diagram of a second view angle of the projection screen in a second state according to another embodiment of the present application, Figure 10 FIG. 2C is a structural schematic diagram of a third view angle of the projection screen in the second state according to another embodiment of the present application, Figure 9 FIG. 2D is a partial enlarged view of I in FIG. 2C.

[0107] As shown in FIG. 2A, in some optional embodiments, the guide 133 and the drum 122 are located on the same side of the display film 110. Figures 1 to 10 It should be noted that the guide 133 and the drum 122 are located on the same side of the display film 110.

[0108]

[0109] ​In some optional embodiments, the guide member 133 is a rotating shaft, and the guide member 133 is arranged to rotate around its own axis, and the axis of the guide member 133 is consistent with the axis of the roller 122.

[0110] In some embodiments, the projection screen 100 further comprises a controller configured to control the rotation of the roller 122, so as to control the display film 110 to be wound on the outer periphery of the roller 122 to be in a retracted state, or to be unwound.

[0111] It should be noted that, in the case that the guide member 133 is rotatable, when the controller is wound to retract the display film 110, or is unwound to expand the display film 110, the guide member 133 rotates, so as to reduce the friction between the guide member 133 and the display film 110, and prevent the display film 110 from being damaged due to the friction between the guide member 133 and the display film 110.

[0112] In some embodiments, the guide member 133 has a long strip structure, so as to be pressed on the display film 110 along the length direction, and to limit the display film 110 to move in a large range. Of course, the guide member 133 can also have other shapes, as long as it can press the display film 110 and limit the display film 110 from moving.

[0113] In some embodiments, the guide member 133 has a circular or polygonal cross-sectional shape, which is not limited in the embodiments of the present application. The guide member 133 with a circular cross-sectional shape is easy to process, and the surface of the guide member 133 is relatively smooth, and is not easy to damage the display film 110. The guide member 133 with a polygonal cross-sectional shape has high stability, and is not easy to move. When the cross-sectional shape of the guide member 133 is polygonal, the cross-sectional shape is square or hexagonal, for example.

[0114] As shown in FIG. 1, Figures 1 to 10 In some optional embodiments, the guide unit 130 further comprises an elastic member 135 and a guide pin 136, the guide pin 136 is cylindrical, and the elastic member 135 is a compression spring.

[0115] The elastic member 135 surrounds the outer periphery of the guide pin 136, one end of the elastic member 135 abuts against the end of the guide pin 136, the other end of the elastic member 135 abuts against the outer side wall of the guide member 133, the guide pin 136 passes through the opening of the guide member 133 and is connected with the tensioning member 134.

[0116] It should be noted that the elastic member 135 provides elastic force for the tensioning member 134, so that the tensioning force of the tensioning member 134 is adjustable, and then as the display film 110 rises or falls, the diameter of the winding drum gradually decreases or increases, the tensioning member 134 moves the guide member 133 relative to the roller 122, and then keeps close to the display film 110 during the movement of the display film 110, preventing it from shaking during the movement.

[0117] In addition, the guide pin 136 provides a guide function for the compression of the elastic member 135, so as to improve the overall stability of the guide unit 130.

[0118] Specifically, when the display film 110 is recycled, the guide member 133 is far away from the lifting rod, and when the display film 110 rises or falls, it will present a state of bending to straightening and straightening to bending. The guide member 133 can move forward and backward, and by reasonably setting the elastic member 135 and the tensioning member 134, on the one hand, the tensioning member 134 can provide variable tensioning force for the guide member 133, so as to ensure that the guide member 133 and the display film 110 are in contact and in a state of elastic tensioning at all times, that is, it can be ensured that the guide member 133 is always in contact with the display film 110, so as to realize that the guide member 133 always provides tensioning force to the display film 110, and ensures that the display film 110 is always in a stable position. When the display film 110 shakes forward and backward in the direction of the arrow, it plays a limiting role on the whole display film 110, and the tensioning force provided at the same time is elastic force, which can change in real time, and will not cause damage to the mechanism or the film due to large force, nor will it cause tensioning failure due to small force.

[0119] In addition, on the other hand, after the tensioning member 134 is adjusted, it is locked and fixed at a suitable position, and finally the tensioning member 134 is kept in place to avoid the tensioning member 134 moving forward and backward due to vibration, fatigue or other failure factors for a long time, causing the tensioning force to change.

[0120] In some optional embodiments, when the display film 110 falls to the lowest point, the tensioning member 134 provides a third tensioning force to the guide member 133, and the third tensioning force is smaller than the second tensioning force.

[0121] When the display film 110 rises to the highest point, the tensioning member 134 provides a fourth tensioning force to the guide member 133, and the fourth tensioning force is greater than the first tensioning force.

[0122] In some embodiments, the display film 110 abuts against a side of the guide member 133 away from the roller 122.

[0123] Specifically, as Figure 5As shown, in the initial state of the guide 133, the elastic member 135 is in the initial compression state, and the total length after initial compression is L1, which is less than the initial length of the elastic member 135, that is, the total length after initial compression is less than the total length without compression, and the initial elastic force generated by the elastic member 135 at this time is F3, wherein the initial elastic force generated by the elastic member 135 provides the third tension force F3 to the guide 133, and at this time, the display film 110 is at the lowest point.

[0124] With the process of the display film 110 rising, the diameter of the roller 122 gradually decreases as the display film 110 rises, and the point A position of the display film 110 on the roller 122 gradually moves to the right in the direction shown in the figure, thereby compressing the elastic member 135, so that the length of the elastic member 135 gradually becomes less than the total length after initial compression, that is, less than L1, at this time, the elastic member 135 provides the first tension force to the guide 133, and then the tensioning member 134 provides the first tension force F1 to the guide 133, at this time, the first tension force gradually increases in the trend of being greater than the third tension force F3, until the display film 110 rises to the highest point, at this time, the diameter of the roller 122 is the smallest, and the elastic member 135 is compressed to the shortest, at this time, the elastic member 135 (tension force) is the largest, the elastic member 135 provides the fourth tension force F4 to the guide 133, and then the tensioning member 134 provides the fourth tension force to the guide 133, which means that the fourth tension force is greater than the first tension force.

[0125] In the process of the display film 110 rising, the display film 110 rises from the lowest point, gradually rises, and then rises to the highest point, and the elastic member 135 provides the third tension force, the first tension force, and then the fourth tension force to the guide 133, respectively, wherein the fourth tension force F4 > the first tension force F1 > the third tension force F3. Through the change of the tension force, it is ensured that the display film 110 is always in a tension state during the rising process of the display film 110, thereby reducing the shaking problem.

[0126] With the process of the display film 110 descending, the diameter of the roller 122 gradually increases as the display film 110 descends, and the point A position of the display film 110 on the roller 122 gradually moves to the left in the direction shown in the figure, thereby gradually releasing the compression amount of the elastic member 135, so that the length of the elastic member 135 gradually tends to the initial length L1, at this time, the elastic member 135 provides the second tension force to the guide 133, and then the tensioning member 134 provides the second tension force F2 to the guide 133, at this time, the second tension force F2 gradually changes in the trend of tending to the first tension force F1, until the display film 110 descends to the lowest point, at this time, the total length of the elastic member 135 returns to L1, and the elastic force returns to the first tension force F1, that is, the initial state, at this time, the diameter of the roller 122 is the largest.

[0127] In the process of the display film 110 descending, the display film 110 is from the highest point, to gradually descend, and then to the lowest point, and the elastic member 135 provides the fourth tension, the second tension, and then the third tension to the guide member 133, respectively, wherein the fourth tension F4> the second tension F2> the third tension F3. The change of the tension ensures that the display film 110 is always in a tension state in the process of the display film 110 descending, and reduces the shaking problem.

[0128] Wherein, the first tension F1> the second tension F2, means that the fourth tension F4> the first tension F1> the second tension F2> the third tension F3.

[0129] It should be noted that when disturbed by external factors (larger wind blowing or human touch), at this time the display film 110 will shake, and the elastic member 135 will be compressed and released along the direction of the shaking trend, and the elastic force generated by the spring compression and release makes the guide member 133 move back and forth as a whole, so that the display film 110 is always in a tension state, reducing the screen shaking, until the shaking stops finally.

[0130] It should be noted that, as described above, when the display film 110 is shaken in the state that the display film 110 has been completely raised and stopped, the display film 110 can be always compressed due to the action of the elastic member 135, which is equivalent to ensuring that the display film 110 is always in tension, so that the shaking stroke / degree and shaking time of the display film 110 are reduced, and in addition, the external force here refers to the instantaneous external force.

[0131] As shown in Figures 1 to 10 In some optional embodiments, a moving groove 1211 is formed on the support seat 121, and the moving groove 1211 is arranged along the moving direction of the tension member 134;

[0132] The structure of the tension member 134 matches the structure of the moving groove 1211, the tension member 134 is located in the moving groove 1211, and moves in the moving groove 1211.

[0133] It should be noted that the moving groove 1211 is arranged to facilitate the adjustment of the tension member 134 to provide a variable tension to the guide member 133, so that the guide member 133 is always in contact with the display film 110 in the process of the display film 110 moving, ensuring that the display film 110 is always in a relatively tight state, and reducing the shaking degree.

[0134] Specifically, as the display film 110 is lowered, the diameter of the roll gradually increases, and the distance between the guide 133 and the roll 122 also gradually increases. At this time, the position of the tensioning member 134 can be adjusted so that the tensioning force on the guide 133 is increased, and thus the guide 133 is kept in close contact with the display film 110 during movement of the display film 110, preventing the display film 110 from shaking during movement.

[0135] In some optional embodiments, the tensioning member 134 is in a block structure.

[0136] The guide unit 130 further includes a first adjusting member 131. An adjusting groove 1341 is formed in the tensioning member 134, and the adjusting groove 1341 is located on the side of the tensioning member 134 away from the guide 133. The extending direction of the adjusting groove 1341 is consistent with the extending direction of the moving groove 1211. The first adjusting member 131 passes through the adjusting groove 1341 and moves in the adjusting groove 1341 to adjust the position of the tensioning member 134 in the moving groove 1211.

[0137] It should be noted that the first adjusting member 131 and the adjusting groove 1341 are provided to adjust the position of the tensioning member 134 in the moving groove 1211, and after adjustment, the tensioning member 134 can be locked again to provide stability and avoid long-term movement of the tensioning member 134, which may cause changes in the tensioning force.

[0138] In some embodiments, the tensioning member 134 can be a tensioning block.

[0139] In some embodiments, the adjusting grooves 1341 located on the same side of the guide 133 can be two, and the two adjusting grooves 1341 are arranged in an up-down interval along the width direction of the tensioning member 134. The width direction of the tensioning member 134 is also the movement direction of the display film 110, and the first adjusting member 131 located on the same side of the guide 133 is also two, and the two first adjusting members 131 and the two adjusting grooves 1341 correspond one-to-one.

[0140] Specifically, mounting holes are formed in the groove wall of the moving groove 1211, and the mounting holes are located within the size range of the adjusting grooves 1341. Therefore, the position of the tensioning member 134 in the moving groove 1211 can be adjusted manually. After adjustment, the first adjusting member 131 passes through the adjusting grooves 1341 and the mounting holes in sequence to fix the tensioning member 134.

[0141] As shown in FIG. 1, Figures 1 to 10 In some optional embodiments, the guide unit 130 further includes a second adjusting member 132, and the second adjusting member 132 is a lead screw.

[0142] The tensioning member 134 is provided with a threaded hole matched with the second adjusting member 132, and the threaded hole is located on the side of the tensioning member 134 away from the elastic member 135. The second adjusting member 132 is screwed into the threaded hole. When the second adjusting member 132 rotates around its axis, the second adjusting member 132 drives the tensioning member 134 to move.

[0143] It should be noted that the second adjusting member 132 is used to adjust the position of the fixed tensioning member 134 in the moving groove 1211, so as to provide a variable tensioning force to the guide member 133, so that the guide member 133 can always tightly contact the display film 110, and the display film 110 is always in a relatively tight state, and the shaking degree is reduced.

[0144] In some embodiments, the guide unit 130 further comprises a locking cap matched with the structure of the second adjusting member 132, and the locking cap is sleeved on the second adjusting member 132 to lock the position of the second adjusting member 132.

[0145] In some optional embodiments, the guide unit 130 further comprises a support shaft 137. The notch section of the moving groove 1211 extends to the end of the tensioning member 134, and the size of the notch section of the moving groove 1211 is smaller than the size of the groove bottom section of the moving groove 1211 in the moving direction of the display film 110.

[0146] The first end of the support shaft 137 is connected with the end of the guide member 133, and the second end of the support shaft 137 extends into the notch section of the moving groove 1211 and moves in the notch section of the moving groove 1211.

[0147] It should be noted that the support shaft 137 is arranged at the end of the guide member 133 to meet the connection relationship between the guide member 133 and the support seat 121. In order to install the support shaft 137 and the guide member 133, the guide unit 130 further comprises a rotating bearing 138 and a plurality of fixed top screws 139. The rotating bearing 138 is sleeved on the support shaft 137 and located between the support shaft 137 and the guide member 133. The plurality of fixed top screws 139 are arranged at intervals on the circumferential side of the rotating bearing 138 to fix the rotating bearing 138 and the guide member 133.

[0148] Specifically, the guide pin 136 passes through the support shaft 137 and the tensioning member 134 in sequence to be fixed on one side of the tensioning member 134, and the second adjusting member 132 is screwed into the other side of the tensioning member 134.

[0149] In addition, the size of the notch section of the moving groove 1211 is smaller than the size of the groove bottom section of the moving groove 1211, which can better match the size of the support shaft 137, so that the structure of the entire guide unit 130 is more compact.

[0150] The projection screen provided in the embodiments of the present application comprises a display film sheet, the display film sheet has a projection light receiving surface; a support unit, the support unit comprises a support base and a roller, the roller is rotationally arranged on the support base, and at least part of the display film sheet is wound on the outer periphery of the roller; a guide unit, the guide unit is movably arranged on the support base, the guide unit comprises a guide piece and at least two tensioning pieces, the at least two tensioning pieces are located at opposite ends of the guide piece in the length direction of the guide piece, the tensioning pieces are used for providing variable tensioning force to the guide piece, when the display film sheet rises, the tensioning pieces provide first tensioning force to the guide piece, the guide piece moves in the direction close to the roller under the action of the first tensioning force, so that the guide piece abuts against the wall surface of the display film sheet; when the display film sheet descends, the tensioning pieces provide second tensioning force to the guide piece, the guide piece moves in the direction away from the roller under the action of the second tensioning force, so that the guide piece abuts against the wall surface of the display film sheet; wherein the first tensioning force is greater than the second tensioning force, and there is an included angle between the moving direction of the guide piece and the moving direction of the display film sheet.

[0151] Through the matched arrangement of the guide piece and the tensioning piece, the tensioning piece provides tensioning force to the guide piece in the process of rising or descending of the display film sheet, the guide piece can be pushed at any time, so that the guide piece can move relative to the roller under the action of the tensioning piece, the guide piece is always in contact with the display film sheet in the moving process of the display film sheet, the display film sheet is always in a relatively tight state, the shaking degree is reduced, the size of the tensioning force can be adjusted in real time according to the actual shaking condition of the sample machine, so as to realize real-time adjustment of the tensioning force, and after the adjustment is completed, the appropriate position is selected for locking and fixing, so as to provide stability, meanwhile, the production is realized, the adjustment difficulty and adjustment time are reduced, and then the display film sheet is prevented from shaking left and right in the moving process, so as to affect the viewing effect of the user.

[0152] In addition, the embodiments of the present application also provide a projection screen 100, comprising:

[0153] a display film sheet 110, the display film sheet 110 has a projection light receiving surface;

[0154] a roller 122, at least part of the display film sheet 110 is wound on the outer periphery of the roller 122;

[0155] a guide piece 133 and a tensioning piece 134, the tensioning piece 134 is used for providing tensioning force to the guide piece 133, when the display film sheet 110 moves, the guide piece 133 moves relative to the roller 122, so as to abut against the wall surface of the display film sheet 110.

[0156] Through the matched arrangement of the guide piece 133 and the tensioning piece 134, the tensioning piece 134 provides the tensioning force to the guide piece 133 in the process of lifting or lowering the display film 110, and can always push the guide piece 133, so that the guide piece 133 can move relative to the roller 122 under the action of the tensioning piece 134. The guide piece 133 is always in contact with the display film 110 in the process of moving the display film 110, so as to ensure that the display film 110 is always in a relatively tight state, reduce the shaking degree, and the size of the tensioning force can be adjusted in real time according to the actual shaking condition of the sample machine, so as to realize real-time adjustment of the tensioning force. After the adjustment is completed, the appropriate position is selected to be locked and fixed, so as to provide stability, and at the same time, the production is realized, the adjustment difficulty and the adjustment time are reduced, and then the left and right shaking of the display film 110 in the moving process is prevented, and the viewing effect of the user is affected.

[0157] Figure 11 A structure schematic diagram of a projection system provided by the embodiment of the application is shown in FIG. 1, the embodiment of the application also provides a projection system 200, which comprises a projection device 210 and the projection screen 100 described above, and the projection device 210 is used for projecting a projection picture to the projection screen 100. Figure 11

[0158] The projection system 200 can comprise the projection screen 100 in the roll-up and lifting type and the projection device 210, the projection screen 100 in the roll-up and lifting type can be the projection screen 100 in the roll-up and lifting type in any of the above-mentioned embodiments, and the front surface of the projection screen 100 in the roll-up and lifting type can be the Fresnel structure.

[0159] The projection device 210 can comprise a projection host, and the projection host is used for emitting a light beam.

[0160] When the projection device 210 is not used, the display film 110 is rolled up by the control mechanism, and then the space occupied by the projection screen 100 is reduced. When the projection device 210 is used, the display film 110 is stretched by the control mechanism to be unfolded, so that the display film 110 reflects the light beam emitted by the projection host and displays a picture. When the display film 110 is in the unfolded state, the guide piece presses the display film 110 and limits the pitch angle of the display film 110, so that the display film 110 can be limited to the correct position by the guide piece, and then the picture displayed on the display film 110 can be prevented from being distorted, blurred and distorted, and the like, so as to improve the display effect of the projection screen 100.

[0161] ​It should be noted that the projection device 210 is internally provided with a projection host, which can be an ultra-short focus projection host, and the ultra-short focus projection host can be a DLP (Digital Light Procession) projection host. In this way, the distance between the projection host and the plane on which the optical film 111 is located is set to be short, so as to realize the miniaturization design of the entire projection device 210.

[0162] The projection host can include a light source, an optical machine and a lens (not shown in the figure), a DMD (Digital Micromirror Device) chip, a control circuit board, an audio processing system, a sound, a heat dissipation system and a heat sink. The light source is used to emit a light beam to the optical machine, and the light source and the lens are fixedly connected with the optical machine. The DMD chip is arranged in the optical machine. The DMD chip, the audio processing system and the heat dissipation system are electrically connected with the control circuit board respectively. The audio processing system is also electrically connected with the sound. The heat dissipation system is also electrically connected with the heat sink.

[0163] In this way, the light beam emitted by the light source is incident on the DMD chip in the optical machine system. The control circuit board controls the DMD chip to modulate the light beam incident on the DMD chip, and carries the image information output by the control circuit board to the lens through the modulated light beam, and then emits the light beam to the display film 110 included in the projection screen 100 through the lens for display. In addition, the control circuit board controls the audio processing system to process the audio information output by the control circuit board, and outputs the processed audio information through the sound. When displaying the image information and playing the audio information, the control circuit board can control the heat dissipation system to drive the heat sink to dissipate heat, so as to avoid the influence of high temperature on the functions of various devices.

[0164] The projection device 210 further includes a receiving part 211 for receiving the projection host and the coiled and lifting type projection screen 100. The receiving part 211 can have a light transmission area 2111 and an opening 2112. The light beam emitted by the projection host can pass through the light transmission area 2111, and the projection screen 100 passes through the opening 2112 and is unfolded. In this way, when the projection device 210 is not used, the projection host and the coiled and lifting type projection screen 100 are received in the receiving part 211, so as to save space. When the projection device 210 is in use, the projection screen 100 is unfolded, and the projection host projects the light beam onto the projection screen 100, so that the projection screen 100 displays the projection picture.

[0165] The vertical distance from the center point of the light transmission area 2111 to the plane where the display film 110 is located after being unfolded is equal to the product of the projection ratio of the projector and the width of the display area on the display film 110, and the width of the display area refers to the size of the display area in the horizontal direction. In this way, it can be ensured that the light beam emitted by the projector can be accurately projected onto the display area of the display film 110, so as to ensure the clarity of the display picture on the display film 110.

[0166] Since the projection ratio is a performance parameter of the projector itself, the projection ratio of the projector is related to the selected projector, that is, different projectors are selected, and the projection ratio is different, and the vertical distance from the center point of the light transmission area 2111 to the plane where the projection screen 100 is located after being unfolded is also different. In this way, in the actual setting process, the vertical distance from the center point of the light transmission area 2111 to the plane where the projection screen 100 is located after being unfolded is calculated by the projection ratio of the projector and the width of the display area, so as to ensure that the light beam emitted by the projector can be completely projected on the display area of the projection screen 100.

[0167] Through the matching setting of the guide piece and the tensioning piece, the tensioning piece provides tensioning force to the guide piece during the lifting or lowering of the display film, which can always push the guide piece, so that the guide piece can move relative to the cylinder under the action of the tensioning piece. The guide piece is always in contact with the display film during the movement of the display film, so as to ensure that the display film is always in a relatively tight state, reduce the shaking degree, and adjust the tensioning force in real time according to the actual shaking situation of the prototype, so as to realize real-time adjustment of the tensioning force. After adjustment is completed, select a suitable position to lock and fix, so as to provide stability, while having mass production, reducing adjustment difficulty and adjustment time, and further preventing the display film from shaking left and right during movement, affecting the viewing effect of the user.

[0168] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0169] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0170] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A projection screen, characterized by The display film is provided with a projection light receiving surface. A support unit includes a support base and a roller rotatably arranged on the support base, and at least part of the display film is wound around the outer periphery of the roller. A guide unit is movably arranged on the support base, and includes a guide piece and at least two tensioning pieces arranged at opposite ends of the guide piece in the length direction of the guide piece, and the tensioning pieces are used to provide variable tension to the guide piece. When the display film is raised, the tensioning pieces provide a first tension to the guide piece, and the guide piece moves in the direction close to the roller under the action of the first tension, so that the guide piece abuts against the wall surface of the display film. When the display film is lowered, the tensioning pieces provide a second tension to the guide piece, and the guide piece moves in the direction away from the roller under the action of the second tension, so that the guide piece abuts against the wall surface of the display film. The first tension is greater than the second tension, and the guide piece has an included angle with the display film. When the display film is lowered to the lowest point, the tensioning pieces provide a third tension to the guide piece, and the third tension is less than the second tension.

2. The projection screen of claim 1, wherein, When the display film is raised to the highest point, the tensioning pieces provide a fourth tension to the guide piece, and the fourth tension is greater than the first tension. The guide piece and the roller are located on the same side of the display film.

3. The projection screen of claim 1, wherein, The guide piece is a rotating shaft, and the guide piece is rotatably arranged around the axis thereof, and the axis of the guide piece is consistent with the axis of the roller.

4. The projection screen of claim 1, wherein, The display film abuts against the side of the guide piece away from the roller.

5. The projection screen of claim 1, wherein, The guide unit further includes an elastic piece and a guide pin, the guide pin is cylindrical, and the elastic piece is a compression spring.

6. The projection screen according to any of claims 1-5, characterized in that The elastic piece surrounds the outer periphery of the guide pin, one end of the elastic piece abuts against the end of the guide pin, and the other end of the elastic piece abuts against the outer side wall of the guide piece, the guide pin passes through the opening of the guide piece and is connected with the tensioning piece. A moving groove is arranged on the support base and extends in the moving direction of the tensioning piece.

7. The projection screen of claim 6, wherein, The structure of the tensioning piece is matched with the structure of the moving groove, the tensioning piece is located in the moving groove and moves in the moving groove. The tensioning piece is a block structure.

8. The projection screen of claim 7, wherein, The guide unit further includes a first adjusting piece, an adjusting groove is arranged on the tensioning piece and located on the side of the tensioning piece away from the guide piece, the extending direction of the adjusting groove is consistent with the extending direction of the moving groove, the first adjusting piece passes through the adjusting groove and moves in the adjusting groove to adjust the position of the tensioning piece in the moving groove. The guide unit further includes a second adjusting piece, and the second adjusting piece is a lead screw.

9. The projection screen of claim 8, wherein, ​ The tensioning member is provided with a threaded hole matched with the second adjusting member, the threaded hole is located on the side of the tensioning member away from the elastic member, and the second adjusting member is screwed into the threaded hole, and the second adjusting member drives the tensioning member to move when rotating around its axis.

10. The projection screen of claim 7, wherein, The guiding unit further comprises a support shaft, the notch section of the moving groove extends to the end of the tensioning member, and the size of the notch section of the moving groove is smaller than the size of the groove bottom section of the moving groove in the moving direction of the display film. The first end of the support shaft is connected with the end of the guiding member, and the second end of the support shaft extends into and moves in the notch section of the moving groove.

11. A projection screen, characterized by The display film has a projection light-receiving surface. The drum is provided with a guiding member and a tensioning member, the tensioning member is used to provide a tensioning force to the guiding member, and the guiding member moves relative to the drum when the display film moves, so as to abut against the wall surface of the display film. The projection device is used to project a projection picture to the projection screen. ​ 12. A projection system, characterized by ​

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