Projection screen and laser projection display system

Abstract

The present application belongs to the technical field of projection display. Disclosed in some embodiments are a projection screen and a laser projection display system. The projection screen comprises a screen frame, the screen frame comprising two foldable frames and first rotating mechanisms. Each foldable frame may comprise a long side portion, the long side portion comprising at least two sub-frame segments capable of rotating relative to each other; and a short side portion connected to one end of the long side portion. Each first rotating mechanism is arranged between at least two sub-frame segments and is configured to drive the at least two sub-frame segments to fold or unfold around a first rotation axis parallel to a bearing surface, so as to change the overall length of the long side portion.

Description

Projection screen and laser projection display system

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 2024117647135, filed on December 3, 2024; Chinese Patent Application No. 2024117651003, filed on December 3, 2024; Chinese Patent Application No. 2024229821890, filed on December 3, 2024; Chinese Patent Application No. 2024113913454, filed on September 30, 2024; and Chinese Patent Application No. 2024224146201, filed on September 30, 2024; all of which are incorporated by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of projection display, and in particular to a projection screen and a laser projection display system. BACKGROUND

[0004] With the continuous development of technology, laser projection systems are increasingly applied to consumers' work and life. The laser projection system mainly includes a laser projection device and a projection screen. The laser projection device emits a light beam to the projection screen, and the projection screen receives the light beam to realize the display of a picture. In related technologies, the size of the projection screen is getting larger and larger, especially the projection screen with a size of 100 inches or more. The projection screen occupies a large space, which inevitably increases the difficulty of transporting the projection screen. SUMMARY

[0005] Some embodiments of the present application provide a projection screen, comprising:

[0006] a screen frame having a bearing surface in an unfolded state, and comprising:

[0007] two folding frames capable of forming a frame structure for supporting the screen in the unfolded state;

[0008] each of the folding frames comprises:

[0009] a long side part comprising at least two sub-frame segments capable of relative rotation;

[0010] a short side part connected to one end of the long side part;

[0011] A first rotating mechanism is arranged between the at least two sub-bezel segments and configured to drive the at least two sub-bezel segments to fold or unfold around a first rotating axis parallel to the bearing surface, so as to change the overall length of the long side part.

[0012] Some embodiments of the present application provide a laser projection display system, comprising:

[0013] A projection screen according to some embodiments of the present application, and

[0014] A projection device configured to project a projection picture to the projection screen. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in some embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. 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 effort on the basis of these drawings.

[0016] FIG. 1A is a structural schematic diagram of a screen frame according to some embodiments of the present application;

[0017] FIG. 1B is a structural schematic diagram of a screen frame according to some embodiments of the present application;

[0018] FIG. 2 is a structural schematic diagram of a folding bezel according to some embodiments of the present application;

[0019] FIG. 3 is a structural schematic diagram of a screen frame according to some embodiments of the present application;

[0020] FIG. 4 is a schematic diagram of the effect of a folding bezel after folding according to some embodiments of the present application;

[0021] FIG. 5 is a structural schematic diagram of a folding bezel according to some embodiments of the present application;

[0022] FIG. 6 is a rotating effect diagram of a first rotating mechanism according to some embodiments of the present application;

[0023] FIG. 7 is a rotating effect diagram of a second rotating mechanism according to some embodiments of the present application;

[0024] FIG. 8 is a structural schematic diagram of a screen frame according to some embodiments of the present application;

[0025] FIG. 9 is a partial structural schematic diagram of a screen frame according to some embodiments of the present application;

[0026] FIG. 10 is a structural schematic diagram of a screen frame according to some embodiments of the present application;

[0027] Fig. 11 is a structural schematic diagram of a sound unit according to some embodiments of the present application;

[0028] Fig. 12 is a partial cross-sectional view of a screen frame according to some embodiments of the present application;

[0029] Fig. 13 is a partial schematic diagram of a screen frame according to some embodiments of the present application;

[0030] Fig. 14 is a structural schematic diagram of a screen frame according to some embodiments of the present application;

[0031] Fig. 15 is a structural schematic diagram of a screen frame according to some embodiments of the present application;

[0032] Fig. 16 is a partial structural schematic diagram of a projection screen according to some embodiments of the present application;

[0033] Fig. 17 is a structural schematic diagram of a projection screen according to some embodiments of the present application;

[0034] Fig. 18 is an effect diagram of a flexible optical screen after contraction in a projection screen according to some embodiments of the present application;

[0035] Fig. 19 is a structural schematic diagram of a projection screen according to some embodiments of the present application;

[0036] Fig. 20 is an exploded structural schematic diagram of a flexible optical screen according to some embodiments of the present application;

[0037] Fig. 21 is a cross-sectional view of a projection screen in a contracted state according to some embodiments of the present application;

[0038] Fig. 22 is a cross-sectional view of a projection screen in an expanded state according to some embodiments of the present application;

[0039] Fig. 23 is a cross-sectional view of a projection screen in an expanded state according to some embodiments of the present application;

[0040] Fig. 24 is a partial cross-sectional view of a projection screen according to some embodiments of the present application;

[0041] Fig. 25 is a partial cross-sectional view of a projection screen according to some embodiments of the present application;

[0042] Fig. 26 is an exploded view of a frame according to some embodiments of the present application;

[0043] Fig. 27 is a partial cross-sectional view of a projection screen according to some embodiments of the present application;

[0044] Fig. 28 is a structural schematic diagram of a laser projection system according to some embodiments of the present application;

[0045] FIG. 29 is a first state diagram of a folding frame according to the related art;

[0046] FIG. 30 is a second state diagram of a folding frame according to the related art;

[0047] FIG. 31 is a structural diagram of a first hinge structure in a folding frame according to the related art;

[0048] FIG. 32 is a cross-sectional diagram of a projection screen according to the related art;

[0049] FIG. 33 is a diagram of a projection screen after installation according to the related art;

[0050] FIG. 34 is an exploded diagram of a projection screen according to some embodiments of the present application;

[0051] FIG. 35 is a structural diagram of a screen frame in a projection screen according to some embodiments of the present application;

[0052] FIG. 36 is an exploded diagram of a screen frame in a projection screen according to some embodiments of the present application;

[0053] FIG. 37 is a structural diagram of a display film in a projection screen according to some embodiments of the present application;

[0054] FIG. 38 is a cross-sectional diagram of a projection screen according to some embodiments of the present application;

[0055] FIG. 39 is an assembly diagram of a side frame and a connecting assembly in a projection screen according to some embodiments of the present application;

[0056] FIG. 40 is a first state diagram of a side frame in a projection screen according to some embodiments of the present application;

[0057] FIG. 41 is a second state diagram of a side frame in a projection screen according to some embodiments of the present application;

[0058] FIG. 42 is an assembly diagram of a vertical beam, a connecting assembly, and a side frame in a projection screen according to some embodiments of the present application;

[0059] FIG. 43 is a diagram of a vertical beam being rotatable in a projection screen according to some embodiments of the present application;

[0060] FIG. 44 is an assembly diagram of a second side frame and a connecting assembly in a projection screen according to some embodiments of the present application, from a first perspective;

[0061] FIG. 45 is an assembly diagram of a second side frame and a connecting assembly in a projection screen according to some embodiments of the present application, from a second perspective;

[0062] Fig. 46 is a cross-sectional view of a second frame and a connecting assembly in a projection screen according to some embodiments of the present application;

[0063] Fig. 47 is a third state of a frame in a projection screen according to some embodiments of the present application;

[0064] Fig. 48 is a fourth state of a frame in a projection screen according to some embodiments of the present application;

[0065] Fig. 49 is an assembly view of a first segment and a second segment in a projection screen according to some embodiments of the present application;

[0066] Fig. 50 is a partial view of a screen frame in a projection screen according to some embodiments of the present application;

[0067] Fig. 51 is a partial cross-sectional view of a screen frame in a projection screen according to some embodiments of the present application;

[0068] Fig. 52 is an assembly view of a display film and a tension rod in a first state in a projection screen according to some embodiments of the present application;

[0069] Fig. 53 is an assembly view of a display film and a tension rod in a second state in a projection screen according to some embodiments of the present application;

[0070] Fig. 54 is an assembly view of a display film and a fastening screw in a first state in a projection screen according to some embodiments of the present application;

[0071] Fig. 55 is an assembly view of a display film and a fastening screw in a second state in a projection screen according to some embodiments of the present application;

[0072] Fig. 56 is an assembly view of a display film and a fastening screw in a third state in a projection screen according to some embodiments of the present application;

[0073] Fig. 57 is an exploded view of a notch and a plug in a projection screen according to some embodiments of the present application;

[0074] Fig. 58 is an assembly view of a notch and a plug in a projection screen according to some embodiments of the present application. DETAILED DESCRIPTION

[0075] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0076] In the related art, the frame for supporting the screen cloth in the projection screen is usually composed of multiple side frames and structural members connecting the side frames. However, as the size of the projection screen continues to increase, the size of the frame also continues to increase. If the frame is transported after being assembled, it is not only difficult to transport, but also easy to damage. If the components of the frame are disassembled and transported to the user's home for assembly, although the risk in the transportation process can be reduced, the assembly difficulty and time of the user are significantly increased, thereby seriously affecting the user experience.

[0077] Please refer to FIG. 1A and FIG. 1B, FIG. 1A is a structural schematic diagram of a screen frame provided by some embodiments of the present application, and FIG. 1B is a structural schematic diagram of a screen frame provided by some embodiments of the present application, wherein FIG. 1A is a rear view of the screen frame not assembled together, and FIG. 1B is a front view of the screen frame assembled together. As shown in FIG. 1B, the screen frame 1000 can have a bearing surface K11 in the unfolded state. The screen frame 1000 can include two folding side frames 100, and the two ends of one folding side frame 100 are respectively detachably connected to the two ends of the other folding side frame 100, that is, the two folding side frames 100 can form a frame structure for supporting the screen in the unfolded state. In some embodiments, the screen frame 1000 can be integrated in a projection screen, and the bearing surface K11 of the screen frame 1000 can be a surface for bearing a flexible screen cloth (not shown) in the projection screen after the screen frame 1000 is unfolded. The bearing surface K11 is a virtual reference plane, but this virtual reference plane is defined by the two folding side frames 100 of the screen frame together after unfolding. FIG. 1A shows a rear view of the screen frame 1000, and the screen frame 1000 has a surface K opposite to the bearing surface K11.

[0078] As shown in FIG. 1A, FIG. 1B and FIG. 2, FIG. 2 is a structural schematic diagram of a folding side frame provided by some embodiments of the present application. Each folding side frame 100 in the screen frame 1000 can include a long side part and a short side part, the long side part includes at least two sub-side frame segments that can rotate relative to each other; the short side part is connected to one end of the long side part; the screen frame 1000 further includes a first rotating mechanism 103 arranged between the at least two sub-side frame segments and configured to drive the at least two sub-side frame segments to fold or unfold around a first rotating axis parallel to the bearing surface K11, so as to change the overall length of the long side part.

[0079] In some embodiments of the present application, by designing the long side part of the screen frame to be composed of at least two sub-side frame segments that can rotate relative to each other, and by arranging the first rotating mechanism, the longest side of the screen frame can be folded. This design directly reduces the size of the screen frame after being folded by half or even smaller, so that it can be easily accommodated in a compact packaging box. This not only greatly reduces the logistics cost, but also makes it possible for large-size screens to enter ordinary families and offices.

[0080] In some embodiments, as shown in FIG. 1A, FIG. 1B and FIG. 2, the short side part can be the first sub-bezel 101, and the long side part can include at least two sub-bezel segments that can be relatively rotated, which can be the second sub-bezel 102. That is, each folding bezel 100 includes the first sub-bezel 101 and at least two second sub-bezels 102 connected in sequence, and the first rotation mechanism 103 is located between the adjacent two second sub-bezels 102. In some embodiments, the screen frame 1000 can further include a second rotation mechanism 104 located between the first sub-bezel 101 and the adjacent second sub-bezel 102. The first rotation mechanism 103 can be configured to drive the two adjacent second sub-bezels 102 to fold or unfold around the first axis L1 parallel to the bearing surface. The second rotation mechanism 104 can be configured to drive the first sub-bezel 101 and the second sub-bezel 102 to fold or unfold around the second axis L2 intersecting the bearing surface. After the folding bezel 100 in the screen frame 1000 is unfolded, the first sub-bezel 101 is perpendicular to the second sub-bezel 102, and the axis lines of the at least two second sub-bezels 102 coincide.

[0081] In some embodiments of the present application, since the two ends of one folding bezel 100 in the screen frame 1000 are detachably connected with the two ends of the other folding bezel 100, the screen frame 1000 can be split into two folding bezels 100. Each folding bezel 100 can be split into the first sub-bezel 101 and the at least two second sub-bezels 102 connected in sequence, and the first rotation mechanism 103 can be used to drive the two second sub-bezels 102 to fold, and the second rotation mechanism 104 can be used to drive the first sub-bezel 101 and the adjacent second sub-bezel 102 to fold. After folding, the size of the folding bezel 100 can be shortened, so that the overall size of the screen frame 1000 is smaller, thereby effectively reducing the transportation difficulty of the screen frame 1000. In addition, after the screen frame 1000 is transported to the user's residence, the first rotation mechanism 103 can be used to unfold the two first sub-bezels 101, and the second rotation mechanism 104 can be used to unfold the first sub-bezel 101 and the adjacent second sub-bezel 102. Then, the two ends of the two folding bezels 100 in the screen frame 1000 are connected. In this way, the user can complete the final assembly of the screen frame 1000 through simple steps, thereby effectively simplifying the assembly process of the screen frame 1000, saving the assembly time, and improving the user's experience.

[0082] Some embodiments of the present application provide a screen frame and 1, comprising: two folding frames, each folding frame can comprise: a first sub-frame and at least two second sub-frames connected in sequence, a first rotating mechanism located between two adjacent second sub-frames, and a second rotating mechanism located between the first sub-frame and an adjacent second sub-frame. Since the two ends of one of the two folding frames in the screen frame are respectively detachably connected with the two ends of the other folding frame, the screen frame can be split into two folding frames. Each folding frame can be further split into a first sub-frame and at least two second sub-frames connected in sequence, and the two second sub-frames can be folded by the first rotating mechanism, and the first sub-frame and the adjacent second sub-frame can be folded by the second rotating mechanism. After folding, the size of the folding frame can be shortened, so that the overall size of the screen frame is smaller, thereby effectively reducing the transportation difficulty of the screen frame. In addition, after the screen frame is transported to the user's residence, the two first sub-frames can be unfolded by the first rotating mechanism, and the first sub-frame and the adjacent second sub-frame can be unfolded by the second rotating mechanism. Then, the two ends of the two folding frames in the screen frame are connected. In this way, the user can complete the final assembly of the screen frame through simple steps, thereby effectively simplifying the assembly process of the screen frame, saving the assembly time, and improving the user's experience.

[0083] In some embodiments of the present application, please refer to FIG. 3, which is a structural schematic diagram of a screen frame provided by some embodiments of the present application. In the same folding frame 100 in the screen frame 1000, the length d1 of the second sub-frame 102 connected with the first sub-frame 101 is greater than the length d2 of the other second sub-frames 102. In this case, since the length d1 of the second sub-frame 102 connected with the first sub-frame 101 is longer, after the folding frame 100 is folded, the other shorter second sub-frames 102 will not protrude from the two ends of the second sub-frame 102 connected with the first sub-frame 101. This makes the size of the folded folding frame 100 more compact, thereby further reducing the transportation volume of the screen frame 1000 and reducing the transportation cost.

[0084] Referring to FIG. 3 and FIG. 4, FIG. 4 is a schematic diagram of the effect of folding the folding frame. In the same folding frame 100 in the screen frame 1000, the length d1 of the second sub-frame 102 connected with the first sub-frame 101 is equal to the length d3 of the first sub-frame 101. It should be noted that the equal length of two sub-frames in some embodiments of the present application means that the lengths of the two sub-frames are approximately equal. For example, in the same folding frame 100 in the screen frame 1000, the length d1 of the second sub-frame 102 connected with the first sub-frame 101 can be approximately equal to the length d3 of the first sub-frame 101. That is, the length d1 of the second sub-frame 102 connected with the first sub-frame 101 can be slightly longer than the length d3 of the first sub-frame 101, or the length d3 of the first sub-frame 101 can be slightly longer than the length d1 of the second sub-frame 102 connected with the first sub-frame 101. In some embodiments of the present application, most projection screens adopt a ratio of 16:9. In the case where the lengths of the first sub-frame 101 and the second sub-frame 102 connected therewith are approximately equal, the distribution of the folded folding frame 100 in the length direction can be more compact, and the end of the first sub-frame 101 will not protrude more than the end of the second sub-frame 102, thereby further reducing the transportation volume of the screen frame 1000 and reducing the transportation difficulty.

[0085] In some embodiments of the present application, please refer to FIG. 5, FIG. 6 and FIG. 7, FIG. 5 is a schematic diagram of the structure of a folding frame, FIG. 6 is a rotating effect diagram of a first rotating mechanism, and FIG. 7 is a rotating effect diagram of a second rotating mechanism. The first rotating mechanism 103 in each folding frame 100 can include a rotating adapter 1031, a first rotating shaft 1032 and a second rotating shaft 1033. One of the two second sub-frames 102 can be rotatably connected with one side of the rotating adapter 1031 through the first rotating shaft 1032, and the other of the two second sub-frames 102 can be rotatably connected with the other side of the rotating adapter 1031 through the second rotating shaft 1033. The axis of the first rotating shaft 1032 is parallel to the axis of the second rotating shaft 1033, and parallel to the bearing surface.

[0086] In some embodiments of the present application, the first end of the two second sub-frames 102 in each folding frame 100 has a notch P, and the two notches P are respectively a first notch P1 and a second notch P2. Wherein, after the two second sub-frames 102 are unfolded, the first notch P1 and the second notch P2 can be used to form an avoidance slot, and at least part of the adapter 1031 can be located in the avoidance slot. In this way, after the screen frame 1000 is unfolded, part of the structure in the adapter 1031 can be hidden in the avoidance slot, so as to improve the compactness of the structure of the screen frame 1000. In some embodiments of the present application, the second rotating mechanism 104 in each folding frame 100 can be a third rotating shaft, and the second end of the second sub-frame 102 and the first sub-frame 101 can be rotatably connected through the third rotating shaft. Wherein, the axis of the third rotating shaft is perpendicular to the bearing surface.

[0087] In the actual use of the screen frame 1000, when it is necessary to fold the screen frame 1000, first, separate the two folding frames 100 in the screen frame 1000 so as to handle each folding frame 100 individually; then, use the second rotating mechanism 104 to rotate the first sub-frame 101 and the adjacent second sub-frame 102 around the second axis L2 until they are completely attached; then, use the first rotating mechanism 103 to rotate the two adjacent second sub-frames 102 around the first axis L1 until they are attached to each other. Through the above steps, the folding frame 100 in the screen frame 1000 can be effectively folded into a smaller size, which is convenient for transportation and reduces transportation costs, and at the same time, it can also ensure that the user can quickly and easily complete the assembly after receiving the product, thereby improving the user experience.

[0088] In some embodiments of the present application, please refer to FIG. 8, which is a structural schematic diagram of a screen frame according to some embodiments of the present application. Each folding frame 100 in the screen frame 1000 can further comprise a first limiting member 105, which is rotatably connected to the first end of one of the two second sub-frames 102 of the folding frame 100 and detachably connected to the first end of the other second sub-frame 102. After the two second sub-frames 102 are unfolded, the first limiting member 105 is rotated to the other second sub-frame 102 relative to one second sub-frame 102, and the two second sub-frames 102 are limited in the coplanar position by the first limiting member 105, so as to avoid the relative rotation of the two second sub-frames 102. When the screen frame 1000 needs to be folded, the first limiting member 105 can be separated from one of the second sub-frames 102, so that the two second sub-frames 102 can be rotated relative to the first rotating mechanism 103. In some embodiments of the present application, as shown in FIG. 4, each folding frame 100 in the screen frame 1000 can further comprise a second limiting member 106, which is rotatably connected to the first end of the first sub-frame 101 of the folding frame 100 and rotatably connected to the first end of the second sub-frame 102 adjacent to the first sub-frame 101. After the first sub-frame 101 and the adjacent second sub-frame 102 are unfolded, the second limiting member 106 limits the first sub-frame 101 and the second sub-frame 102 adjacent to the first sub-frame 101 in the fixed position, so as to avoid the relative rotation of the first sub-frame 101 and the adjacent second sub-frame 102.

[0089] Please refer to FIG. 9, which is a partial structural schematic diagram of a screen frame according to some embodiments of the present application. The screen frame 1000 can further comprise a third limiting member 700, which is fixedly connected to the second sub-frame 102 of one folding frame 100 and detachably connected to the first sub-frame 101 of the other folding frame 100. After the screen frame 1000 is unfolded, the third limiting member 700 can be fixedly connected to the second sub-frame 102 of one folding frame 100 and remain connected to the first sub-frame 101 of the other folding frame 100, so as to ensure the stability of the structure of the entire screen frame 1000. When the folding operation of the two folding frames 100 in the screen frame 1000 is needed, the detachable connection between the third limiting member 700 and the first sub-frame 101 can be released, so that the screen frame 1000 can be smoothly divided into two parts for folding.

[0090] In some embodiments of the present application, please refer to FIG. 10, which is a structural schematic diagram of a screen frame according to some embodiments of the present application. The folding frame 100 in the screen frame 1000 has a plurality of carrying grooves C on the side away from the bearing surface. The screen frame 1000 can also include a plurality of sound production units 200 corresponding to the plurality of carrying grooves C, wherein at least part of each sound production unit 200 can be located in the corresponding carrying groove C. In this case, by integrating the sound production unit 200 in the carrying groove C of the folding frame 100, the internal space of the screen frame 1000 can be fully utilized, improving the space utilization rate, thereby helping to reduce the volume of the overall device. In addition, the carrying groove C can provide physical protection for the sound production unit 200, reducing the risk of external impact and damage to the sound production unit 200 during transportation and use. At the same time, by integrating the sound production unit 200 in the carrying groove C of the folding frame 100, the screen frame 1000 has the sound production function, improving the multifunctionality and user experience of the device.

[0091] Please refer to FIG. 11, which is a structural schematic diagram of a sound production unit according to some embodiments of the present application. The bottom surface of the carrying groove C in the folding frame 100 has a plurality of connection holes (not shown), and the sound production unit 200 in the screen frame 1000 can have a plurality of buffer fixing members 201 corresponding to the plurality of connection holes. Wherein at least part of each buffer fixing member 201 can be fixed in the corresponding connection hole. In some embodiments, the buffer fixing member 201 can be a rubber plunger, and the number of buffer fixing members 201 and connection holes is four. In this case, by fixing the buffer fixing member 201 in the connection hole of the carrying groove C, the stable installation of the sound production unit 200 in the screen frame 1000 can be ensured, thereby preventing the loosening or falling of the sound production unit 200 during transportation and use, and improving the stability of the overall structure. In addition, the buffer fixing member 201 adopts the form of a rubber plunger, and the rubber plunger has a certain elasticity, so it can effectively absorb the vibration and impact of the sound production unit 200, reduce the noise interference in the sound transmission process, thereby improving the sound quality of the sound produced by the sound production unit 200, and prolonging the service life of the sound production unit 200.

[0092] In some embodiments of the present application, please refer to FIG. 12 and FIG. 13, FIG. 12 is a partial sectional view of a screen frame provided by some embodiments of the present application, and FIG. 13 is a partial schematic view of a screen frame provided by some embodiments of the present application. The screen frame 1000 can further include a decorative frame 300 arranged around the two folding frames 100. The decorative frame 300 can have a plurality of sound emission areas (not shown). The plurality of sound emission areas can correspond to the plurality of sound emitting units 200 one by one, and can correspond to the plurality of bearing grooves C one by one. Here, the decorative frame 300 is arranged around the two folding frames 100, which not only can shield the structural components inside the folding frames 100 to improve the appearance of the screen frame 1000, but also can protect the edges of the screen frame 1000 to prevent the edge parts of the screen frame 1000 from being impacted, thereby prolonging the service life of the screen frame 1000. In the screen frame 1000, the sound emission surface P of each sound emitting unit 200 faces the corresponding sound emission area, and each sound emission area has a plurality of sound holes Q that communicate with the corresponding bearing groove C. In this case, during use of the device, the sound emitted by the sound emitting unit 200 can be transmitted to the outside through the sound emission surface P of the sound emitting unit 200, the sound emission area of the decorative frame 300, and the plurality of sound holes Q in turn, so that the sound can be more evenly distributed around the entire screen frame 1000, thereby improving the sound quality and auditory experience. In some embodiments of the present application, as shown in FIG. 12 and FIG. 13, the screen frame 1000 can further include a shielding plate A, which can be connected with the folding frame 100 at the bearing groove C, and the shielding plate A can cover the bearing groove C. In this way, the shielding plate A can effectively prevent dust and foreign matter from entering the bearing groove C, thereby protecting the sound emitting unit 200 from pollution and damage and prolonging its service life. At the same time, the shielding plate A can also shield the bearing groove C and its internal structure, making the appearance of the screen frame 1000 more neat and beautiful.

[0093] Please refer to FIG. 14, which is a structural schematic diagram of a screen frame according to some embodiments of the present application. The screen frame 1000 can include a first long side frame 400 and a second long side frame 500 arranged oppositely. The first long side frame 400 can include at least two second sub-frames 102 in one folding side frame 100, and the second long side frame 500 can include at least two second sub-frames 102 in another folding side frame 100. It should be noted that in some embodiments of the present application, the screen frame 1000 can also include two short side frames arranged oppositely. In the two short side frames, one end of one short side frame can be connected to one end of the first long side frame 400 and the other end of the short side frame can be connected to the other end of the first long side frame 400. One end of the other short side frame can be connected to one end of the second long side frame 500 and the other end of the short side frame can be connected to the other end of the second long side frame 500. The two short side frames in the screen frame 1000 can be two first sub-frames 101 in the two folding side frames 100, respectively.

[0094] In some embodiments of the present application, each second sub-frame 102 in the first long side frame 400 has at least one bearing groove C, and each first sub-frame 101 in the two folding side frames 100 has at least one bearing groove C. That is, each short side frame in the screen frame 1000 can have at least one bearing groove C. It should be noted that the first long side frame 400 in the screen frame 1000, which is provided with the bearing groove C, can serve as the upper side frame of the screen frame 1000. Correspondingly, the second long side frame 500 in the screen frame 1000, which is not provided with the bearing groove C, can serve as the lower side frame of the screen frame 1000, and the two short side frames in the screen frame 1000 can serve as the left side frame and the right side frame of the screen frame 1000, respectively. In addition, for the bearing groove C in the first sub-frame 101, the distance d4 between the bearing groove C and the first long side frame 400 is less than the distance d5 between the bearing groove C and the second long side frame 500. In some embodiments of the present application, the sound emitted by the sound emitting unit 200 in the upper side frame is sky sound, and the sound emitted by the sound emitting unit 200 in the left side frame and the right side frame is surround sound. In this way, the sound emitted by the sound emitting unit 200 can be evenly propagated from multiple positions to form a complete sound emitting scheme, thereby improving the overall sound quality.

[0095] In some embodiments of the present application, referring to FIG. 15, FIG. 15 is a structural schematic diagram of a screen frame according to some embodiments of the present application. The screen frame 1000 can further include at least one connecting plate 600, both ends of the connecting plate 600 being connected with the first long side frame 400 and the second long side frame 500 respectively. The connecting plate 600 can have a first wire passage M and a wire outlet S in communication with the first wire passage M. The folding side frame 100 in the screen frame 1000 can have a second wire passage N in communication with the bearing groove C, and the second wire passage N can be in communication with the first wire passage M. The screen frame 1000 can further include an audio wire (not shown), one end of the audio wire being connected with the sound emitting unit 200, and the other end of the audio wire sequentially passing through the first wire passage M and the second wire passage N and then passing out of the wire outlet S. In this case, by arranging the first wire passage M and the second wire passage N, the internal space of the screen frame 1000 can be fully utilized, and the audio wire can avoid occupying additional space, thereby reducing the volume of the overall device and making the structure of the screen frame 1000 more compact and beautiful. In addition, the wire passage can also protect the audio wire from the external environment and reduce damage caused by abrasion or pulling, thereby prolonging the service life of the audio wire and ensuring the stability of sound transmission.

[0096] In some embodiments of the present application, as shown in FIG. 15, the first routing channel M in the connecting plate 600 can include a first sub-channel M1 and a second sub-channel M2. The first sub-channel M1 is distributed between the outlet port S and the first long side frame 400, and the second sub-channel M2 is distributed between the outlet port S and the second long side frame 500. The second routing channel N in the folding side frame 100 can include a third sub-channel N1, a fourth sub-channel N2, and a fifth sub-channel N3. The third sub-channel N1 is distributed within the first long side frame 400 and communicates with the first sub-channel M1, the fourth sub-channel N2 is distributed within the first sub-side frame 101, and the fifth sub-channel N3 is distributed within the second long side frame 500 and used to communicate the fourth sub-channel N2 and the second sub-channel M2. For the audio line connected to the sound production unit 200 distributed on the first long side frame 400, the end of the audio line away from the sound production unit 200 can pass through the third sub-channel N1 and the first sub-channel M1 in turn and then pass out from the outlet port S. For the audio line connected to the sound production unit 200 distributed on the first sub-side frame 101, the end of the audio line away from the sound production unit 200 can pass through the fourth sub-channel N2, the fifth sub-channel N3, and the second sub-channel M2 in turn and then pass out from the outlet port S. In this case, by subdividing the first routing channel M in the connecting plate 600 into the first sub-channel M1 and the second sub-channel M2, and subdividing the second routing channel N in the folding side frame 100 into the third sub-channel N1, the fourth sub-channel N2, and the fifth sub-channel N3, the routing path of the audio line can be made very clear. The user can quickly find the correct path when installing and maintaining, reducing the time and difficulty of wiring. Moreover, this design also ensures that the path of the audio line is the shortest, reduces the redundancy of the cable, and makes the wiring more neat.

[0097] In summary, some embodiments of the present application provide a screen frame and a projection screen, which include two folding frames. Each folding frame can include a first sub-frame and at least two second sub-frames connected in sequence, a first rotating mechanism between two adjacent second sub-frames, and a second rotating mechanism between the first sub-frame and an adjacent second sub-frame. Since the two ends of one folding frame in the screen frame are detachably connected with the two ends of the other folding frame, the screen frame can be split into two folding frames. Each folding frame can be further split into a first sub-frame and at least two second sub-frames connected in sequence, and the two second sub-frames can be folded by the first rotating mechanism, and the first sub-frame and the adjacent second sub-frame can be folded by the second rotating mechanism. After folding, the size of the folding frame can be shortened, so that the overall size of the screen frame is smaller, thereby effectively reducing the transportation difficulty of the screen frame. In addition, after the screen frame is transported to the user's residence, the two first sub-frames can be unfolded by the first rotating mechanism, and the first sub-frame and the adjacent second sub-frame can be unfolded by the second rotating mechanism. Then, the two ends of the two folding frames in the screen frame are connected. In this way, the user can complete the final assembly of the screen frame through simple steps, thereby effectively simplifying the assembly process of the screen frame, saving the assembly time, and improving the user's experience.

[0098] Some embodiments of the present application also provide a projection screen, which can include a screen frame 1000 and a flexible curtain that can be attached to the bearing surface of the screen frame 1000. The screen frame 1000 is any of the screen frames 1000 described above. Referring to FIG. 16, FIG. 16 is a partial structure diagram of a projection screen according to some embodiments of the present application. The projection screen 2000 can include an optical film 2011, a flexible curtain 20112, a support rod 2013, and a screw 2014. In some embodiments of the present application, when the projection screen 2000 needs to be assembled: first, the optical film 2011 is attached to the flexible curtain 20112, then a cloth bag is sewn on the four edges of the flexible curtain 20112, the support rod 2013 is inserted into the cloth bag of the flexible curtain 20112 when the film is tensioned, and then the support rod 2013 is fixed to the unfolded folding frame 100 by the screw 2014, so that the optical film 2011 can be flattened; finally, the above structure is shielded by the decorative frame 300 to improve the overall aesthetics.

[0099] Some embodiments above describe in detail that by designing the screen frame as a split, double-foldable structure, the portability of the screen frame is greatly improved, and the integration of additional functions such as sound is possible, mainly suitable for split application scenarios that require on-site installation of flexible curtains. However, those skilled in the art can understand that the inventive concept of the present application is not limited to some embodiments described above. In order to further improve the convenience of use of users and solve the problem of cumbersome on-site installation of curtains in the split solution, some embodiments of the present application improve and extend the concept of the above foldable frame, and propose a technical solution of integrating the screen frame and the flexible optical screen. The technical solution aims to realize the integrated storage and rapid deployment of the entire projection screen, thereby providing an out-of-box user experience while ensuring portability.

[0100] Please refer to FIG. 17 and FIG. 18, FIG. 17 is a structural schematic diagram of a projection screen provided by some embodiments of the present application, and FIG. 18 is an effect diagram of a flexible optical screen after being retracted in a projection screen provided by some embodiments of the present application. The projection screen 2000 can include a screen frame 1000, a flexible optical screen 2001 and a sliding part 3001.

[0101] The screen frame 1000 in the projection screen 2000 has a loadable surface. Wherein, after the screen frame 1000 is unfolded, the loadable surface of the screen frame 1000 can be a surface for loading the flexible optical screen 2001 in the projection screen 2000. FIG. 17 shows a rear view of the projection screen 2000, and the screen frame 1000 has a surface K opposite to the loadable surface. The screen frame 1000 in the projection screen 2000 can include two opposite folding frames AA. Each folding frame AA can include a long side part including a first sub-frame A1 and a second sub-frame A2, and a short side part including a first support frame BB and a second support frame CC opposite to each other. The screen frame 1000 further includes a rotating mechanism A3, i.e. a first rotating mechanism, between the first sub-frame A1 and the second sub-frame A2. An end of the first sub-frame A1 away from the second sub-frame A2 is connected to an end of the first support frame BB, and an end of the second sub-frame A2 away from the first sub-frame A1 is connected to an end of the second support frame CC. Wherein, the rotating mechanism A3 can be used to drive the first sub-frame A1 to fold or unfold relative to the second sub-frame A2 around an axis L11 parallel to the loadable surface.

[0102] In some embodiments, the sliding part 3001 in the projection screen 2000 can be located between and in sliding connection with the two folding frames AA. The flexible optical screen 2001 in the projection screen 2000 can be attached to the bearing surface, and the flexible optical screen 2001 can have two oppositely arranged first side edges E1 and two oppositely arranged second side edges E2, the two first side edges E1 being in sliding connection with the two folding frames AA respectively, one of the two second side edges E2 being connected with the first support frame BB, and the other of the two second side edges E2 being connected with the sliding part 3001.

[0103] In some embodiments of the present application, the sliding part 3001 in the projection screen 2000 can be configured to move relative to the two folding frames AA to expand or contract the flexible optical screen 2001. Wherein, after the flexible optical screen 2001 is in the expanded state, the sliding part 3001 is connected with the second support frame CC; after the flexible optical screen 2001 is in the contracted state, the flexible optical screen 2001 and the sliding part 3001 are both located between the two first sub-frames A1.

[0104] In some embodiments of the present application, the screen frame 1000 in the projection screen 2000 and the flexible optical screen 2001 are designed as an integral structure. The screen frame 1000 is composed of two sets of oppositely arranged long edge parts and two sets of oppositely arranged first support frames BB and second support frames CC, and the first sub-frame A1 and the second sub-frame A2 in each long edge part can be connected through a rotating mechanism A3. When assembling the projection screen 2000, the user can rotate the first sub-frame A1 relative to the second sub-frame A2 in each long edge part through the rotating mechanism A3, so as to realize the expansion of the entire screen frame 1000. Then, only need to simply pull the sliding part 3001 to stretch the flexible optical screen 2001, and the installation of the projection screen 2000 can be completed. In this way, the assembly difficulty of the projection screen 2000 can be reduced, and the assembly process of the projection screen 2000 can be effectively simplified, thereby the assembly efficiency of the projection screen 2000 can be ensured to be relatively high.

[0105] Some embodiments of the present application provide a projection screen, comprising: a screen frame, a flexible optical screen and a sliding part. The screen frame and the flexible optical screen in the projection screen are designed as an integral structure. The screen frame is composed of two oppositely arranged folding frames. Each folding frame comprises a long side part and a short side part, and the short side part comprises a first supporting frame and a second supporting frame. That is, the screen frame is composed of two groups of oppositely arranged long side parts and two groups of oppositely arranged first supporting frames and second supporting frames. The first sub-frame and the second sub-frame in each long side part can be connected by a rotating mechanism. When the projection screen needs to be assembled, the user can rotate the first sub-frame relative to the second sub-frame in each long side part by the rotating mechanism, so as to realize the unfolding of the whole frame. Then, only the flexible optical screen needs to be stretched by simply pulling the sliding part, so as to complete the installation of the projection screen. In this way, the assembly difficulty of the projection screen can be reduced, the assembly process of the projection screen can be effectively simplified, and the assembly efficiency of the projection screen can be ensured to be high.

[0106] In some embodiments of the present application, please refer to FIG. 19, which is a structural schematic diagram of a projection screen provided by some embodiments of the present application. The rotating mechanism A3 in each folding frame AA can comprise: an adapter A31, a first rotating shaft A32 and a second rotating shaft A33. The first sub-frame A1 in each folding frame AA can be rotatably connected to one side of the adapter A31 through the first rotating shaft A32, and the second sub-frame A2 in each folding frame AA can be rotatably connected to the other side of the adapter A31 through the second rotating shaft A33. Wherein, the axis of the first rotating shaft A32 is parallel to the axis of the second rotating shaft A33, and parallel to the bearing surface. In some embodiments of the present application, the first end of the first sub-frame A1 and the second sub-frame A2 in each folding frame AA has a notch P, and the two notches P are respectively a first notch P1 and a second notch P2. Wherein, after the first sub-frame A1 and the second sub-frame A2 are unfolded, the first notch P1 and the second notch P2 can be used to enclose an avoidance groove (not shown), and at least part of the adapter A31 can be located in the avoidance groove. In this way, after the screen frame 1000 is unfolded, part of the structure of the adapter A31 can be hidden in the avoidance groove, so as to improve the compactness of the structure of the projection screen 2000.

[0107] In actual use of the projection screen 2000, when it is needed to fold the projection screen 2000, first, the sliding part 3001 is pulled, so that the flexible optical screen 2001 and the sliding part 3001 are located between two first sub-frames A1, then the first sub-frame A1 and the adjacent second sub-frame A2 are rotated around the axis L11 parallel to the bearing surface by the rotating mechanism A3 until they are completely attached, so that the projection screen 2000 can be effectively folded into a smaller size, facilitating transportation and reducing transportation cost. When it is needed to assemble the projection screen 2000, the first sub-frame A1 in each folded frame AA can be rotated relative to the second sub-frame A2 by the rotating mechanism A3, so as to realize the unfolding of the entire screen frame 1000. Subsequently, only the sliding part 3001 needs to be pulled to stretch the flexible optical screen 2001, so as to complete the installation of the projection screen 2000. In this way, the assembly difficulty of the projection screen 2000 can be reduced, so that the user can quickly and simply complete the assembly after receiving the product, and the user experience is improved.

[0108] In some embodiments of the present application, referring to FIG. 20 and FIG. 21, FIG. 20 is an exploded structural schematic view of a flexible optical screen according to some embodiments of the present application, and FIG. 21 is a cross-sectional view of a projection screen in a contracted state according to some embodiments of the present application. The flexible optical screen 2001 in the projection screen 2000 can include a flexible curtain 2011, an optical film 2021, and a plurality of support strips 2031. The flexible curtain 2011 in the flexible optical screen 2001 can have two first side edges E1 and two second side edges E2. The optical film 2021 in the flexible optical screen 2001 can be connected to the side of the flexible curtain 2011 away from the bearing surface. The plurality of support strips 2031 in the flexible optical screen 2001 can be connected to the side of the flexible curtain 2011 away from the optical film 2021, and the plurality of support strips 2031 are arranged at intervals in the extension direction of the folded frame AA. Wherein, after the flexible optical screen 2001 in the projection screen 2000 is in a contracted state, the part of the optical film 2021 distributed between two adjacent support strips 2031 can be bent. In this case, since the optical film 2021 usually has special optical properties, after the optical film 2021 is connected to the side of the flexible curtain 2011 away from the bearing surface, the picture quality displayed by the flexible optical screen 2001 can be better, which helps to improve the viewing experience. And the plurality of support strips 2031 arranged on the side of the flexible curtain 2011 away from the optical film 2021 can provide necessary rigid support for the flexible optical screen 2001, preventing unnecessary deformation of the flexible optical screen 2001 due to other external forces.

[0109] In some embodiments of the present application, the flexible curtain 2011 in the flexible optical screen 2001 can have various structures. For the sake of clarity, some embodiments of the present application will be described schematically in the following two optional implementation manners. In some embodiments of the present application, please refer to FIG. 22, which is a sectional view of a projection screen in an unfolded state according to some embodiments of the present application. The flexible curtain 2011 in the flexible optical screen 2001 can have a first hollow area U1 located in the central region, both ends of each support strip 2031 are connected to the flexible curtain 2011 near the two first side edges E1, and the part of each support strip 2031 located in the first hollow area U1 is in contact with the optical film 2021. In some embodiments of the present application, please refer to FIG. 23, which is a sectional view of a projection screen in an unfolded state according to some embodiments of the present application. The flexible curtain 2011 in the flexible optical screen 2001 can have a second hollow area U2 distributed between two adjacent support strips 2031. In this case, whether the first hollow area U1 is arranged on the flexible curtain 2011 or the second hollow area U2 is arranged on the flexible curtain 2011, the material thickness of the area can be reduced, thereby reducing the resistance when the flexible optical screen 2001 is folded, enabling the flexible optical screen 2001 to be bent more smoothly, and avoiding wrinkles or unevenness caused by material accumulation.

[0110] In some embodiments of the present application, as shown in FIG. 23, the sliding part 3001 in the projection screen 2000 can include a sliding frame 301 and a first support rod 302 mounted on the sliding frame 301; the sliding frame 301 is located between the two folding frames AA and is in sliding connection with the two folding frames AA; the first support rod 302 is connected to the second side edge E2 of the two second side edges E2 of the flexible optical screen 2001 away from the first support frame BB. In this case, by the relative sliding between the sliding frame 301 and the two folding frames AA, the first support rod 302 can be moved. Since the first support rod 302 is connected to the second side edge E2 of the two second side edges E2 of the flexible optical screen 2001 away from the first support frame BB, the movement of the sliding frame 301 will drive the flexible optical screen 2001 to move correspondingly, thereby realizing the unfolding and contraction of the flexible optical screen 2001.

[0111] In some embodiments of the present application, please refer to FIG. 24, which is a partial sectional view of a projection screen provided in some embodiments of the present application. The folding frame AA in the screen frame 1000 can have a sliding groove PP on the side facing the sliding frame 301, and the sliding frame 301 can be partially located in the sliding groove PP and connected with the sliding groove PP in a sliding manner. In this case, by sliding the sliding frame 301 in the sliding groove PP, not only can the sliding frame 301 be provided with reliable guiding function, but also the smooth movement of the sliding frame 301 during sliding can be ensured, and the frictional resistance is reduced, thereby improving the smoothness of the operation of the projection screen 2000.

[0112] In some embodiments of the present application, as shown in FIG. 23, the sliding part 3001 in the projection screen 2000 can further include a plurality of elastic members 303, which can be arranged in sequence along the extension direction of the first support rod 302, one end of each elastic member 303 is connected with the sliding frame 301, and the other end of each elastic member 303 is connected with the first support rod 302. For example, the elastic member 303 can be a spring. In this way, the impact force and vibration generated during the sliding of the sliding frame 301 can be absorbed by the elastic member 303, thereby protecting the flexible optical screen 2001 and other components from damage.

[0113] In some embodiments of the present application, please refer to FIG. 25, which is a partial sectional view of a projection screen provided in some embodiments of the present application. The screen frame 1000 in the projection screen 2000 can further include at least two connecting members 1011. For example, the connecting member 1011 can be an adjusting screw. Wherein, after the flexible optical screen 2001 is in the unfolded state, the sliding frame 301 is connected with the second support frame CC through the at least two connecting members 1011, and the at least two connecting members 1011 are distributed on both sides of the first support rod 302 in the extension direction of the first support rod 302. In this way, the connection between the second support frame CC and the sliding frame 301 can be achieved by passing the connecting member 1011 through the through hole (not shown) on the second support frame CC and screwing it into the threaded hole (not shown) on the sliding frame 301. And by continuously rotating the connecting member 1011, the connection between the sliding frame 301 and the second support frame CC can be made more firm to prevent loosening. In addition, by adjusting the screwing depth, the distance between the second support frame CC and the sliding frame 301 can be adjusted. Wherein, the deeper the screwing depth, the smaller the distance between the second support frame CC and the sliding frame 301, so that greater tension can be applied to the flexible optical screen 2001 to ensure that the flexible optical screen 2001 has higher flatness.

[0114] In some embodiments of the present application, please refer to FIG. 26, which is an exploded view of a frame according to some embodiments of the present application. The first sub-frame A1 in the folding frame AA can have a first accommodating cavity Q1, the second sub-frame A2 can have a second accommodating cavity Q2, and the first support frame BB can have a third accommodating cavity Q3. The screen frame 1000 in the projection screen 2000 can further include: a second support rod 1021 suspendedly fixed in the first accommodating cavity Q1, a third support rod 1031 suspendedly fixed in the second accommodating cavity Q2, and a fourth support rod 1041 suspendedly fixed in the third accommodating cavity Q3. Among them, the first side edge E1 of the flexible optical screen 2001 is in sliding connection with the second support rod 1021 and the third support rod 1031; the second side edge E2 of the two second side edges E2 of the flexible optical screen 2001, which is away from the sliding part 3001, is connected with the fourth support rod 1041.

[0115] In some embodiments of the present application, since the first sub-frame A1, the second sub-frame A2, and the first support frame B in the screen frame 1000 have the same form, the first support frame BB in the screen frame 1000 is taken as an example. Please refer to FIG. 27, which is a partial sectional view of a projection screen according to some embodiments of the present application. The screen frame 1000 in the projection screen 2000 can include an inner frame 110 and an outer frame 120 fixedly connected. The third accommodating cavity Q3 and the access passage Z communicating with the third accommodating cavity Q3 can be formed between the inner frame 110 and the outer frame 120. The second side edge E2 of the two second side edges E2 of the flexible optical screen 2001, which is away from the second support frame CC, can enter the third accommodating cavity Q3 through the access passage Z and be connected with the fourth support rod 1041 in the third accommodating cavity Q3.

[0116] It should be noted that, as shown in FIG. 25, the frame connected with the second side edge E2 of the two second side edges E2 of the flexible optical screen 2001, which is away from the first support frame BB, includes a separately arranged inner frame and an outer shell. The inner frame can be the sliding frame 301 in the sliding part 3001, and the outer frame can be the second support frame in the screen frame 1000. The inner frame and the outer frame can be fixed together through at least two connecting pieces 1011. However, the inner frame and the outer frame of the first sub-frame A1, the second sub-frame A2, and the first support frame B in the screen frame 1000 are integrally formed.

[0117] In the related art, the frame of the projection screen usually adopts a rectangular structure, which contains four support rods, each of which corresponds to one of the four edges of the frame. Each support rod is located at the corresponding edge position and is connected to the flexible curtain through multiple springs. These springs can exert uniform tension on the support rods, thereby ensuring that the flexible curtain is taut and flat. In some embodiments of the present application, the inner frame 110 and the outer frame 120 are designed as an integrated structure, and a third accommodating cavity Q3 accommodating the fourth support rod 1041 is formed between the inner frame 110 and the outer frame 120. In this way, as long as the fourth support rod 1041 is fixed in the third accommodating cavity Q3, the flexible optical screen 2001 can be ensured to be in a taut state, thereby improving the flatness of the flexible optical screen 2001. Therefore, the assembly difficulty of the projection screen 2000 can be further reduced, and the assembly process of the projection screen 2000 is effectively simplified, thereby ensuring that the assembly efficiency of the projection screen 2000 is high.

[0118] In some embodiments of the present application, the first side edge E1 has a plurality of first accommodating pockets, each of which can be sleeved on the second support rod 1021 and the third support rod 1031, and the plurality of accommodating pockets are separately arranged on the second support rod 1021 and the third support rod 1031. For example, the plurality of accommodating pockets and the support strips 2031 correspond one by one, so that interference between adjacent two accommodating pockets during the stretching and contraction of the flexible optical screen 2001 can be avoided. The second side edge E2 has a second accommodating pocket, and the second accommodating pocket arranged on one of the second side edges E2 can be sleeved on the fourth support rod 1041, and the second accommodating pocket arranged on the other of the second side edges E2 can be sleeved on the first support rod 302. The number of the accommodating pockets sleeved on the first support rod 302 is plural, so that the elastic member 303 can be hung on the first support rod 302 between two adjacent accommodating pockets. Since the second support rod 1021 is suspendedly fixed in the first accommodating cavity Q1, the third support rod 1031 is suspendedly fixed in the second accommodating cavity Q2, and the fourth support rod 1041 is suspendedly fixed in the third accommodating cavity Q3, it can be ensured that the accommodating pockets sleeved on the second support rod 1021, the third support rod 1031 and the fourth support rod 1041 will not interfere with the inner wall of the accommodating cavity.

[0119] In some embodiments, as shown in FIG. 26, after the first sub-edge frame A1 and the second sub-edge frame A2 in the folding edge frame AA are unfolded, the axis center line of the second support rod 1021 coincides with the axis center line of the third support rod 1031. In this case, since the axis center lines of the second support rod 1021 and the third support rod 1031 coincide, the flexible optical screen 2001 can smoothly slide along a straight line when it is unfolded or contracted, reducing the phenomenon of jamming or incoordination during sliding and improving the smoothness of operation.

[0120] In some embodiments of the present application, as shown in FIG. 26, the screen frame 1000 in the projection screen 2000 can further include a first corner fixing block 1051 fixed between the first support frame BB and the folding frame AA, and a second corner fixing block 106 fixed between the second support frame CC and the folding frame AA. For example, the number of the first corner fixing block 1051 and the second corner fixing block 106 is two. The first corner fixing block 1051 is fixedly connected with the second support rod 1021 and the fourth support rod 1041, and the second corner fixing block 106 is fixedly connected with the third support rod 1031. In this case, the first corner fixing block 1051 and the second corner fixing block 106 can provide hanging points for the second support rod 1021, the third support rod 1031 and the fourth support rod 1041, so that these support rods can be suspended in the accommodating cavity without contacting the inner wall of the screen frame 1000. In this way, the friction between each support rod and the inner wall of the screen frame 1000 can be reduced, so that the movement of the flexible optical screen 2001 when being unfolded and retracted is more smooth.

[0121] Some embodiments of the present application provide a projection screen, which includes a screen frame, a flexible optical screen and a sliding part. The screen frame and the flexible optical screen in the projection screen are designed as an integral structure. The screen frame can include two folding frames and a rotating mechanism, each folding frame can include a long side part and a short side part, the long side part can include a first sub-frame and a second sub-frame, and the short side part can include a first support frame and a second support frame, that is, the screen frame can be composed of two groups of oppositely arranged long side parts and two groups of oppositely arranged first support frames and second support frames, and the first sub-frame and the second sub-frame in each long side part can be connected through the rotating mechanism. When the projection screen needs to be assembled, the user can rotate the first sub-frame relative to the second sub-frame in each long side part through the rotating mechanism, so as to realize the unfolding of the whole frame. Then, the installation of the projection screen can be completed by simply pulling the sliding part to stretch the flexible optical screen. In this way, the assembly difficulty of the projection screen can be reduced, the assembly process of the projection screen can be effectively simplified, and the assembly efficiency of the projection screen can be ensured to be high.

[0122] Some embodiments of the present application also provide a laser projection system, which can be an ultra-short focus laser projection system. As shown in FIG. 28, which is a structural schematic diagram of a laser projection system according to some embodiments of the present application, the laser projection system can include a projection screen 2000 and a laser projection device 3000. The projection screen 2000 can be the projection screen in the above embodiments. The laser projection device 3000 can be electrically connected to the exciter (not shown) in the projection screen 2000. Thus, when the laser projection device 3000 is working, the laser projection device 3000 can not only emit light obliquely upward, so that the laser projection device 3000 can project a picture to the projection screen 2000, but also send a sound electrical signal to the exciter in the projection screen 2000, so that the projection screen 2000 can emit sound while displaying the projected picture.

[0123] Some embodiments described above effectively reduce the transportation volume and simplify the assembly steps of the user by designing the screen frame as two detachably connected folding frames, each of which is composed of a sub-frame that can be folded by a rotating mechanism. To further improve the user experience and simplify the installation process, some embodiments of the present application provide a pre-integrated whole structure of the frame and the flexible optical screen. When installing, the user does not need to perform complex frame splicing and curtain tensioning operations, but can quickly complete the installation of the entire projection screen by unfolding the folding frame and simply pulling the sliding component, greatly reducing the assembly difficulty and time.

[0124] The main purpose of some embodiments of the present application is to provide a projection screen and a projection system, which can realize convenient entry into a house and reduce the gap between the second frame after assembly, thereby improving the stability after assembly.

[0125] To achieve the above purpose, some embodiments of the present application provide a projection screen, which includes:

[0126] A display film, the display film having a projection light-receiving surface;

[0127] A screen frame, the screen frame including two frame assemblies, the two frame assemblies being connected to surround the display film, the frame assembly including a first frame and a second frame, the first frame and the second frame being rotatably connected, the second frame including a first segment and a second segment;

[0128] A connecting assembly, including:

[0129] A rotating connecting piece, the first segment and the second segment being connected to the rotating connecting piece, respectively;

[0130] An adjusting piece is located between the first section and the second section, the rotating connecting piece is rotatably arranged on the adjusting piece and is movable on the adjusting piece, so that the distance between the first section and the second section is variable.

[0131] The beneficial effects of some embodiments of the present application are: through the foldable design of the screen frame, the scattered projection screen is folded, on the one hand, the volume of the screen can be reduced, the screen can be conveniently installed, the volume of transportation and / or installation can be reduced, and the problem of installation of a large-size screen can be solved; on the other hand, when the screen frame is assembled at the user's home, the folding and fixing are simple, the traditional hinge structure folding is removed, the rotating connecting piece is used, which is simpler and more ingenious, the cost is reduced, and the installation speed can be significantly improved; in addition, through the cooperation of the adjusting piece and the rotating connecting piece, the gap of the second frame after assembly is reduced, so that the stability after assembly is improved.

[0132] On the basis of the above technical solutions, some embodiments of the present application can also be improved as follows.

[0133] In some embodiments, the screen frame has a flat state and a folded state, when the screen frame is switched from the folded state to the flat state, the rotating connecting piece moves to the first position, driving the first section and the second section to move towards each other;

[0134] When the screen frame is switched from the flat state to the folded state, the rotating connecting piece moves to the second position, driving the first section and the second section to move away from each other;

[0135] The first position is the middle part of the adjusting piece, and the second position is the end part of the adjusting piece.

[0136] In some embodiments, the first section has a first groove, and the second section has a second groove, the groove opening of the first groove and the groove opening of the second groove are connected to form an accommodation cavity, and the adjusting piece is located in the accommodation cavity.

[0137] In some embodiments, at least one adjusting hole is formed in the adjusting piece, the adjusting hole penetrates through the opposite sides of the adjusting piece along the width direction of the second frame, and the rotating connecting piece is movable in the adjusting hole;

[0138] A first rotating hole is formed in the first section, part of the rotating connecting piece passes through the first rotating hole and the adjusting hole, and rotates in the first rotating hole and the adjusting hole;

[0139] A second rotating hole is formed in the second section, another part of the rotating connecting piece passes through the second rotating hole and part of the adjusting hole, and rotates in the second rotating hole and the other part of the adjusting hole, so that the first section and the second section are folded.

[0140] In some embodiments, the at least one adjusting hole includes a first adjusting hole and a second adjusting hole, the first adjusting hole and the second adjusting hole are arranged along a length direction of the adjusting member, a position of the first adjusting hole matches a position of the first section, and a position of the second adjusting hole matches a position of the second section.

[0141] The partial rotation connecting member rotates through the first rotation hole and the first adjusting hole, and the other partial rotation connecting member rotates through the second rotation hole and the second adjusting hole.

[0142] In some embodiments, the adjusting hole is an oblong hole.

[0143] The adjusting hole extends along a length direction of the second frame.

[0144] In some embodiments, the adjusting member is a rotation block; and / or,

[0145] The length of the first section is longer than the length of the second section.

[0146] In some embodiments, the first frame and the second frame are integrally formed.

[0147] In some embodiments, the screen frame further includes a pull rod, the pull rod is connected to an end of the display film.

[0148] The frame is provided with a notch, the notch is located at a connection position of the first frame and the second frame, and the pull rod passes through the notch to be installed in the frame.

[0149] In some embodiments, the screen frame further includes a plug block, the plug block is plugged in the notch.

[0150] In some embodiments, the rotation connecting member is a pin shaft.

[0151] The first frame is provided with a first connecting hole, and the second frame is provided with a second connecting hole, the rotation connecting member passes through the first connecting hole and the second connecting hole to enable the first frame to rotate relative to the second frame.

[0152] Some embodiments of the present application further provide a projection screen, which includes:

[0153] A display film;

[0154] An integrated frame, which surrounds an outer periphery of the display film, the integrated frame includes a first frame and a second frame, and the second frame includes a first section and a second section.

[0155] An adjusting rotation member, which is rotationally arranged between the first section and the second section to enable a distance between the first section and the second section to be variable.

[0156] In a third aspect, the present application further provides a projection system, which includes a projection device and the projection screen as described above, and the projection device is used to project a projection picture to the projection screen.

[0157] The projection screen and the projection system provided by some embodiments of the present application, the projection system comprises a projection device and the projection screen described above, the projection device is used for projecting a projection picture to the projection screen; wherein the projection screen comprises: a display film, the display film has a projection light receiving surface; a screen frame, the screen frame comprises two edge frames, the two edge frames are connected to surround the outer periphery of the display film, the edge frame comprises a first edge frame and a second edge frame, the first edge frame and the second edge frame are rotationally connected, the second edge frame comprises a first section and a second section; a connecting assembly, comprising: a rotational connecting piece, the first section and the second section are connected to the rotational connecting piece respectively; an adjusting piece, the adjusting piece is located between the first section and the second section, the rotational connecting piece is rotationally arranged on the adjusting piece and moves on the adjusting piece, so that the distance between the first section and the second section is variable.

[0158] Through the foldable design of the screen frame, the scattered projection screen is folded, which can reduce the household volume of the screen, realize convenient household, reduce the transportation and / or household volume, and solve the problem of household of large-size screens; on the other hand, the folding and fixing are simple when the user assembles the screen frame, the traditional hinge structure folding is removed, the rotational connecting piece is used, which is simpler and more ingenious, the cost is reduced, and the installation speed can be significantly improved; in addition, through the cooperation of the adjusting piece and the rotational connecting piece, the gap of the second edge frame is reduced after assembly, so that the stability after assembly is improved.

[0159] At present, when household installation is performed, the entire screen frame is relatively large in size, which is relatively inconvenient in the entire transportation and installation process. Therefore, the screen frame can be designed as a foldable structure, such as a folding frame 200. FIG. 29 is a first state schematic diagram of a folding frame provided by the related art, FIG. 30 is a second state schematic diagram of a folding frame provided by the related art, FIG. 31 is a structural schematic diagram of a first hinge structure in a folding frame provided by the related art, FIG. 32 is a cross-sectional schematic diagram of a projection screen provided by the related art, and FIG. 33 is a schematic diagram of a projection screen after installation provided by the related art. As shown in FIGS. 29 to 33, the folding frame 200 comprises a long edge frame 210 and a short edge frame 220, the long edge frame 210 is folded once, and in order to fold the folding frame 200, a first hinge structure 230 is designed, the household volume is reduced by half, and elevator household can be realized; although the household problem is solved, the folding frame 200 is relatively large in size, which leads to large packaging volume and is inconvenient for household and transfer transportation. In addition, each hinge structure is composed of multiple components, which increases the types of materials and the structure cost.

[0160] In order to overcome the defects in the related art, the projection screen and the projection system provided by the present application fold the scattered projection screen through the foldable design of the screen frame, which can reduce the volume of the screen, realize convenient entry, reduce the transportation and / or entry volume, and solve the problem of entry of large-size screens. In addition, the folding and fixing of the screen frame are simple when the user assembles the screen frame at home, and the traditional hinge structure folding is removed, and a rotating connecting piece is used, which is simpler and more ingenious, reduces the cost, and can significantly improve the installation speed. The content of some embodiments of the present application will be described in detail below with reference to the drawings, so that those skilled in the art can more clearly and detailedly understand the content of the present application.

[0161] FIG. 34 is an exploded schematic view of the projection screen provided by some embodiments of the present application, FIG. 35 is a structural schematic view of the screen frame in the projection screen provided by some embodiments of the present application, and FIG. 36 is an exploded schematic view of the screen frame in the projection screen provided by some embodiments of the present application.

[0162] As shown in FIGS. 34 to 36, some embodiments of the present application provide a projection screen 2000, which comprises:

[0163] a display film 110, the display film 110 having a projection light-receiving surface;

[0164] a screen frame 120, the screen frame 120 comprising two edge frames, the edge frames being one-piece edge frames, the two edge frames being connected to surround the display film 110, the edge frames comprising a first edge frame 121 and a second edge frame 122, wherein the length of the second edge frame 122 is longer than the length of the first edge frame 121;

[0165] a connecting assembly 130, the connecting assembly 130 comprising at least one rotating connecting piece 131, the rotating connecting piece 131 penetrating through the first edge frame 121 and the second edge frame 122 to rotatably connect the first edge frame 121 to the second edge frame 122.

[0166] The second edge frame 122 comprises a first section 1221 and a second section 1222, and the first section 1221 and the second section 1222 are respectively connected to the rotating connecting piece 131, as shown in FIG. 40;

[0167] As shown in FIG. 44, the connecting assembly 130 further comprises an adjusting piece 132 located between the first segment 1221 and the second segment 1222 and used to adjust the distance between the first segment 1221 and the second segment 1222, the rotating connecting piece 131 is rotatably arranged on the adjusting piece 132 and moves on the adjusting piece 132 so that the distance between the first segment 1221 and the second segment 1222 is variable; wherein part of the rotating connecting piece 131 rotatably connects the first segment 1221 and the first end of the adjusting piece 132 so that the first segment 1221 rotates relative to the second segment 1222, and the other part of the rotating connecting piece 131 rotatably connects the second segment 1222 and the second end of the adjusting piece 132 so that the second segment 1222 rotates relative to the first segment 1221.

[0168] Through the above setting, that is, through the foldable design of the screen frame 120, the scattered projection screen 2000 is folded, on the one hand, the volume of the screen entering the house can be reduced, the convenience of entering the house can be realized, the volume of transportation and / or entering the house can be reduced, and the problem of large-size screen entering the house can be solved; on the other hand, when the user assembles the screen frame 120, the folding and fixing are simple, the traditional hinge structure folding is removed, the rotating connecting piece 131 is adopted, which is more simple and ingenious, the cost is reduced, and the installation speed can be significantly improved; in addition, through the cooperation of the adjusting piece 132 and the rotating connecting piece 131, the gap of the second frame 122 after assembly is reduced, so as to improve the stability after assembly. Specifically, the hinge structure of the related art, for example, the first hinge structure 230, the second hinge structure 240, and the third hinge structure 250.

[0169] In some embodiments, the screen frame 120 has a flattened state and a folded state, when the screen frame 120 is switched from the folded state to the flattened state, the rotating connector 131 moves to the first position, driving the first section 1221 and the second section 1222 to move towards each other; when the screen frame 120 is switched from the flattened state to the folded state, the rotating connector 131 moves to the second position, driving the first section 1221 and the second section 1222 to move away from each other; wherein the first position is the middle part of the adjusting member, and the second position is the end part of the adjusting member. It should be noted that when the screen frame 120 is switched from the folded state to the flattened state, the rotating connector 131 located in the first section 1221 and the rotating connector 131 located in the second section 1222 are both moved to the first position, since the rotating connector 131 located in the first section 1221 is moved, thereby driving the first section 1221 to move, accordingly, when the rotating connector 131 located in the second section 1222 is moved, the second section 1222 is driven to move, therefore, at this time, the first section 1221 and the second section 1222 move towards each other, thereby reducing the distance between them. Similarly, when the screen frame 120 is switched from the flattened state to the folded state, the rotating connector 131 located in the first section 1221 and the rotating connector 131 located in the second section 1222 are both moved to the second position, at this time, the first section 1221 and the second section 1222 move away from each other, thereby increasing the distance between them, to provide space for folding between them.

[0170] It should be noted that the following specific description of each structure.

[0171] [Display film 110]

[0172] FIG. 37 is a structural schematic diagram of a display film in a projection screen according to some embodiments of the present application. As shown in FIG. 37, the front side of the display film 110 is the projection light receiving surface. It should be noted that the display film 110 can generally be composed of a hard layer, a Fresnel structure layer, a projection layer, etc., and has certain strength and rigidity, and can have a certain verticality in the vertical free sag state so that the display film 110 appears flat. However, due to the certain softness, the display film 110 cannot meet the flatness requirement for display without support or external interference, and the screen is not flat, which can cause the laser projection picture to be distorted, blurred, have uneven brightness, or other degradation problems. In order to flatten the display film 110, in some embodiments, the display film 110 includes a film body 111 and a synthetic cloth 112 that are adhered to each other. In some embodiments, the film body 111 is a hard and straight material, and the synthetic cloth 112 generally has the characteristics of inelasticity, ultra-thin, density, and high strength, etc. When the synthetic cloth 112 and the film body 111 are bonded, an integrated structure can be formed between the two, thereby facilitating force transmission and enabling the film body 111 to stretch following the deformation of the synthetic cloth 112. Specifically, the synthetic cloth 112 can generally be a soft cloth. In this way, the synthetic cloth 112 can better transmit the force when stretched, and has stable properties and can adapt to a wide range of environments, such as maintaining good flatness and reliability in an environment temperature of -10°C to 40°C.

[0173] [screen frame 120]

[0174] FIG. 38 is a cross-sectional schematic diagram of a projection screen according to some embodiments of the present application, FIG. 39 is an assembly schematic diagram of a side frame and a connecting assembly in a projection screen according to some embodiments of the present application, FIG. 40 is a first state schematic diagram of a side frame in a projection screen according to some embodiments of the present application, and FIG. 41 is a second state schematic diagram of a side frame in a projection screen according to some embodiments of the present application.

[0175] Referring to FIGS. 34-41, it should be noted that the screen frame 120 is generally a frame structure, and the screen frame 120 encloses a rectangular or square hollow area which can be used to accommodate the display film 110, and the screen frame 120 can be wrapped around the edges of the display film 110 to provide protection for the display film 110, and the screen frame 120 and the display film 110 are connected and tensioned by a deformable or displaceable tensioning module. In some embodiments, the screen frame 120 can be a metal piece, and the material thereof can include one or more of copper, iron, aluminum, tin, and lead. In some embodiments, the screen frame 120 can be a plastic material. It should be noted that the specific material of the screen frame 120 is not limited herein in some embodiments of the present application. Of course, during production and manufacturing, the screen frame 120 can also be made of steel plate, plastic, or synthetic material, provided that the strength is ensured. In order to achieve convenient entry into the house and rapid assembly of the projection screen 2000, the screen frame 120 can be two side frames, and the first side frame 121 and the second side frame 122 in the side frames can be foldably arranged to reduce the entry volume.

[0176] It should be noted that the second side frame 122 can be a long side frame, and the first side frame 121 can be a short side frame, and the first side frame 121 and the second side frame 122 are assembled with each other to form a side frame, and two side frames are assembled with each other to form the screen frame 120, which is not limited herein in terms of size in actuality. The first side frame 121 and the second side frame 122 can be foldably arranged to facilitate folding of the scattered frame structure, which on the one hand reduces the transportation and / or entry volume, and on the other hand enables rapid assembly of the folded screen frame 120, thereby improving product influence. In addition, it should be noted that in order to further improve the convenience of assembly, the side frame can be designed as an integrated side frame. Compared with the inner frame and the outer frame in the structure of the related art, the side frame in some embodiments of the present application is designed as an integrated structure of the inner frame and the outer frame, which eliminates the procedure of assembling the inner frame first and then assembling the outer frame, reduces the assembly and disassembly procedures, and further improves the work efficiency.

[0177] [connection assembly 130]

[0178] It should be noted that the design of the rotating connecting piece 131 instead of the hinge structure of the related art can ensure that the first bezel 121 can rotate relative to the second bezel 122 to achieve the foldable effect of the screen frame 120, while reducing the material cost required for folding. As shown in FIGS. 39-41, specifically, the rotating connecting piece 131 passes through the first bezel 121 and the second bezel 122 and can rotate relative to the first bezel 121 and the second bezel 122, respectively. The foldable inner-outer integrated screen frame 120 mainly plays a skeleton role and a decoration role, supports the stability and appearance modification of the entire display film 110. The inner-outer integrated frame is 2 identical bezel frames in the present application, and each bezel frame is composed of a first bezel 121, a second bezel 122, a vertical beam 123, and an angle iron and the like.

[0179] In some embodiments, the rotating connecting piece 131 is a pin shaft; a first connecting hole 1211 is formed on the first bezel 121, a second connecting hole 1223 is formed on the second bezel 122, and the rotating connecting piece 131 passes through the first connecting hole 1211 and the second connecting hole 1223 to make the first bezel 121 rotate relative to the second bezel 122. It should be noted that the rotating connecting piece 131 is a pin shaft, which can further reduce the cost of materials. The first connecting hole 1211 and the second connecting hole 1223 can be round holes to satisfy the rotating connecting piece 131 passing through the first connecting hole 1211 and the second connecting hole 1223 and rotating therein.

[0180] In some embodiments, the first bezel 121 and the second bezel 122 each include an inner bezel segment and an outer bezel segment; the inner bezel segment and the outer bezel segment are integrally connected, and the outer bezel segment wraps at least part of the inner bezel segment. It should be noted that the inner bezel segment and the outer bezel segment are integrally connected, which has the advantages of fast assembly speed, small amount of materials, small volume package, convenient transportation and entry into the house, high integration of the bezel frame, fast assembly speed, simplicity and reliability, and low cost. Specifically, the inner-outer integrated bezel frame reduces the volume of the package and entry into the house by folding, and the display film 110 is in a curled form, thereby reducing the volume of the package and entry into the house.

[0181] As shown in FIGS. 32 and 33, after the projection screen in the structure of the related art is installed to the wall surface, only the frame side surface and the front surface of the outer frame 1022 can be observed, that is, the two surfaces of the dashed line in the sectional view. Therefore, the definitions of the inner frame 1012 and the outer frame 1022 can be distinguished by whether they can be observed after being installed to the wall, and the components including the visible side surface and the front surface are called the outer frame 1022, and the internal components that cannot be observed are called the inner frame 1012. The structure of the related art is two separate structure pieces, and when assembled, the inner frame 1012 needs to be assembled first, and then the outer frame 1022 is assembled.

[0182] As shown in FIG. 38, the first frame 121 and the second frame 122 in the present application are both integrally formed structures, which means that the inner frame segment and the outer frame segment of the first frame 121 are integrally formed structures. Therefore, the assembly speed of the present application is fast. The screen frame 120 of some embodiments of the present application integrates the functions of the inner frame and the outer frame at the same time, and the inner frame and the outer frame are designed as one component, that is, the screen frame 120 is an integrally formed structure, that is, the first frame 121 and the second frame 122 are both integrally formed structures. At the same time, the other structures of the integrated frame form the inside of the frame due to the display film 110 and the wall, which can play a structural support role. That is, the screen frame 120 supports the stability and appearance modification of the entire screen at the same time.

[0183] In some embodiments, the outer frame segment surrounds the outer periphery of the inner frame segment, and the inner frame segment and the outer frame segment are made of the same material. Regarding the integral connection of the inner frame segment and the outer frame segment, it can be understood that before leaving the factory, the two can be connected into an integral structure by welding or other connecting members. After folding and winding the display film 110 into the house, assembly is carried out, and when assembled in the user's home, only the frame needs to be assembled from the folded state to the unfolded state, and the two unfolded frame assemblies can be assembled without the need to assemble the inner frame first and then the outer frame. The overall assembly process is less.

[0184] FIG. 42 is an assembly diagram of a vertical beam, a connecting assembly, and a frame assembly in a projection screen provided by some embodiments of the present application, and FIG. 43 is a diagram showing that a vertical beam in a projection screen provided by some embodiments of the present application can rotate. As shown in FIGS. 42 and 43, in some embodiments, the screen frame 120 further comprises at least one vertical beam 123 supported at the middle of the screen frame 120, and a rotating connecting member 131 penetrates through the vertical beam 123 and the second frame 122 to enable the vertical beam 123 to rotate relative to the second frame 122. It should be noted that the vertical beam 123 is provided to strengthen the support stability of the screen frame 120, and considering portability into the house, the vertical beam 123 can be foldable. Specifically, the vertical beam 123 is rotatably arranged on the second frame 122 through the rotating connecting member 131, and when the vertical beam 123 is folded, the vertical beam 123 can be folded to the second frame 122 or hidden in the second frame 122, and when the vertical beam 123 is unfolded, the vertical beam 123 can be connected between the two second frames 122 to strengthen the support strength. In some embodiments, the vertical beam 123 is two, and the two vertical beams 123 are located at the middle of the screen frame 120, one of which is rotatably arranged on the second frame 122 in one frame assembly through the rotating connecting member 131, and the other of which is rotatably arranged on the second frame 122 in the other frame assembly through the rotating connecting member 131. The two vertical beams 123 are staggered to be folded on different second frames 122, so that the structure is more compact.

[0185] FIG. 44 is an assembly view of a first perspective of a second frame and a connecting assembly in a projection screen according to some embodiments of the present application, FIG. 45 is an assembly view of a second perspective of the second frame and the connecting assembly in the projection screen according to some embodiments of the present application, FIG. 46 is a sectional view of the second frame and the connecting assembly in the projection screen according to some embodiments of the present application, FIG. 47 is a third state view of a frame structure in the projection screen according to some embodiments of the present application, and FIG. 48 is a fourth state view of the frame structure in the projection screen according to some embodiments of the present application.

[0186] As shown in FIGS. 44-48, in some embodiments, the second frame 122 includes a first segment 1221 and a second segment 1222, and the rotating connecting member 131 is rotatably connected between the first segment 1221 and the second segment 1222 to allow the first segment 1221 and the second segment 1222 to rotate and fold. It should be noted that the rotating connecting member 131 passes through the first segment 1221 and the second segment 1222 and can rotate relative to the first segment 1221 and the second segment 1222, respectively. The design of the rotating connecting member 131 instead of the hinge structure in the related art can reduce the material cost required for folding while ensuring that the second frame 122 can be folded to achieve the foldable effect of the screen frame 120. In some embodiments, the connecting assembly 130 further includes an adjusting member 132 located between the first segment 1221 and the second segment 1222 and configured to adjust the distance between the first segment 1221 and the second segment 1222, and part of the rotating connecting member 131 rotatably connects the first segment 1221 and a first end of the adjusting member 132 to allow the first segment 1221 to rotate relative to the second segment 1222, and another part of the rotating connecting member 131 rotatably connects the second segment 1222 and a second end of the adjusting member 132 to allow the second segment 1222 to rotate relative to the first segment 1221. It should be noted that the adjusting member 132 is provided to adjust the distance between the first segment 1221 and the second segment 1222, thus achieving seamless folding. In essence, when assembled, the first segment 1221 and the second segment 1222 perform a telescopic movement after being unfolded to eliminate the folding gap therebetween.

[0187] In some embodiments, the first end of the adjusting member 132 is located in the first segment 1221, the second end of the adjusting member 132 is located in the second segment 1222, one rotating connecting member 131 connects the first segment 1221 and the first end of the adjusting member 132 and can rotate in the first segment 1221 and the first end of the adjusting member 132 to achieve the purpose of rotating the first segment 1221 relative to the second segment 1222, and another rotating connecting member 131 connects the second segment 1222 and the second end of the adjusting member 132 and can rotate in the second segment 1222 and the second end of the adjusting member 132 to achieve the purpose of rotating the second segment 1222 relative to the first segment 1221, and finally achieve the foldable effect of the first segment 1221 and the second segment 1222.

[0188] In some embodiments, at least one adjusting hole is formed on the adjusting member 132, the adjusting hole penetrates through opposite sides of the adjusting member 132 along the width direction of the second frame 122, and the rotating connecting member 131 is movable in the adjusting hole; a first rotating hole 12211 is formed on the first section 1221, part of the rotating connecting member 131 passes through the first rotating hole 12211 and the adjusting hole and rotates in the first rotating hole 12211 and the adjusting hole; a second rotating hole 12221 is formed on the second section 1222, another part of the rotating connecting member 131 passes through the second rotating hole 12221 and part of the adjusting hole and rotates in the second rotating hole 12221 and part of the adjusting hole, so as to fold the first section 1221 and the second section 1222. It should be noted that the adjusting hole is arranged so that the rotating connecting member 131 can rotate in the adjusting hole and also move in the adjusting hole, and the first section 1221 and the second section 1222 can perform telescopic movement after the second frame 122 is unfolded, so as to eliminate the folding gap between the first section 1221 and the second section 1222, to realize gapless folding and unfolding of the second frame 122, and further improve the support stability after unfolding and assembly.

[0189] In some embodiments, the first rotation hole 12211 is two, and one of the partial adjustment members 132 is located in the first section 1221, wherein one rotation connecting member 131 passes through one first rotation hole 12211, the adjustment hole, and the other first rotation hole 12211 in sequence to meet the rotatable setting, and the adjustment member 132 and the first section 1221 can be connected through the rotation connecting member 131. Correspondingly, the second rotation hole 12221 is two, and the other partial adjustment member 132 is located in the second section 1222, wherein the other rotation connecting member 131 passes through one second rotation hole 12221, the adjustment hole, and the other second rotation hole 12221 in sequence to meet the rotatable setting, and the adjustment member 132 and the second section 1222 can be connected through the rotation connecting member 131. In some embodiments, the at least one adjustment hole includes a first adjustment hole 1321 and a second adjustment hole 1322, the first adjustment hole 1321 and the second adjustment hole 1322 are arranged in the length direction of the adjustment member 132, the position of the first adjustment hole 1321 matches the position of the first section 1221, and the position of the second adjustment hole 1322 matches the position of the second section 1222; part of the rotation connecting member 131 rotates through the first rotation hole 12211 and the first adjustment hole 1321, and the other part of the rotation connecting member 131 rotates through the second rotation hole 12221 and the second adjustment hole 1322. It should be noted that such a setting, specifically, the first adjustment hole 1321, the first rotation hole 12211 of the first section 1221, and one rotation connecting member 131 are matched and arranged, the second adjustment hole 1322, the second rotation hole 12221 of the second section 1222, and the other rotation connecting member 131 are matched and arranged, so that the overall structure is more compact. In some embodiments, the first adjustment hole 1321 and the second adjustment hole 1322 are the same structure, which can further ensure that the movement stroke of one rotation connecting member 131 in the first adjustment hole 1321 is consistent with the movement stroke of the other rotation connecting member 131 in the second adjustment hole 1322, to improve the effect of gapless folding of the second side frame 122.

[0190] With reference back to FIGS. 44-46, in some embodiments, the first section 1221 has a first recess 12212, the second section 1222 has a second recess 12222, the slot of the first recess 12212 communicates with the slot of the second recess 12222 to form a receiving cavity, and the adjusting member 132 is located in the receiving cavity. It should be noted that the receiving cavity formed by the first recess 12212 and the second recess 12222 is configured to better accommodate the adjusting member 132, so that the adjusting member 132 can be hidden in the second bezel 122, ensuring smooth operation of the structure while having a higher appearance. In some embodiments, the size of the receiving cavity is greater than the size of the adjusting member 132, so as to satisfy that the adjusting member 132 can rotate in the receiving cavity, that is, the receiving cavity has a space to satisfy the rotation of the adjusting member 132. In some embodiments, the adjusting hole is an oblong hole; the adjusting hole extends along the length direction of the second bezel 122. It should be noted that such a configuration satisfies that the first section 1221 moves towards the second section 1222, and at the same time, the second section 1222 moves towards the first section 1221, that is, the first section 1221 and the second section 1222 can move towards each other to reduce the gap between them after unfolding, achieving zero-gap unfolding.

[0191] In some embodiments, the adjusting member 132 is a rotating block; and / or, the length of the first section 1221 is longer than the length of the second section 1222. It should be noted that the adjusting member 132 is a rotating block and can be embedded in the second bezel 122. Wherein, the design that the length of the first section 1221 is longer than the length of the second section 1222 can be understood as that the first section 1221 and the second section 1222 are not set equally, or in other words, the first section 1221 and the second section 1222 are not folded equally. The purpose of such a design is to enhance the bending deformation resistance when the second bezel 122 is unfolded; in addition, the second section 1222 can be folded into the first section 1221, so that the second bezel 122 can be folded and compressed, reducing the occupied space.

[0192] Figure 49 is an assembly diagram of the first section and the second section of the projection screen according to some embodiments of the present application. As shown in Figures 47-49, it is to be noted that the assembly process of the screen frame 120 is as follows: first, the assembly process of the screen frame 120 is opposite to the folding, the frame is unfolded by folding in half, after the second frame 122 is unfolded, the two frame assemblies need to be spliced, after splicing, 2 mounting screws 127 are fixed at each of the 4 corners, and 8 mounting screws 127 are fixed at the corners. The corner iron structure has been pre-assembled on the screen frame 120 by the mounting screw 127, and only 2 mounting screws 127 need to be fixed at the other end. Then 1 mounting screw 127 is fixed at each of the positions of the vertical beams 123, and 2 mounting screws 127 are fixed at the positions of the vertical beams 123. Since the other end of the vertical beam 123 is folded by means of the rotating connecting piece 131, only 1 mounting screw 127 needs to be tightened at the other end. After the folding gap is eliminated at the folding position of the second frame 122, the lever 129 is rotated, and then 2 mounting screws 127 are fixed at each of the 2 folding positions. In summary, the screen frame 120 according to some embodiments of the present application only needs 14 mounting screws 127 to complete the assembly, and the number of mounting screws 127 is small. At the same time, it can be folded without gaps, without other scattered parts, and the assembly speed is fast.

[0193] Figure 50 is a partial view of the screen frame of the projection screen according to some embodiments of the present application, Figure 51 is a partial cross-sectional view of the screen frame of the projection screen according to some embodiments of the present application, Figure 52 is an assembly diagram of the display film and the pull rod in a first state of the projection screen according to some embodiments of the present application, and Figure 53 is an assembly diagram of the display film and the pull rod in a second state of the projection screen according to some embodiments of the present application.

[0194] In some embodiments, the screen frame 120 further includes a pull rod 124 connected to the end of the display film 110. It is to be noted that since the area of the display film 110 is large, the pull rod 124 is usually needed to be stretched to effectively unfold the display film 110 into a flat state, so that pulling the pull rod 124 means pulling the entire display film 110, which is more uniform. In some embodiments, the synthetic cloth 112 has a cloth bag 1121, the pull rod 124 is inserted into the cloth bag 1121, and then the pull rod 124 is inserted through the gap 125 to be installed into the frame, until the pull rod is inserted through the four corners of the display film 110, and the display film 110 is preliminarily installed on the integrated screen frame 120 by means of the cloth bag 1121 and the pull rod 124. Due to the action of gravity when the screen frame 120 is placed on the ground, the pull rod 124 and the cloth bag 1121 are placed at the bottom of the screen frame 120.

[0195] Fig. 54 is a schematic diagram of the first state of assembly of the display film and the fastening screw in the projection screen according to some embodiments of the present application, Fig. 55 is a schematic diagram of the second state of assembly of the display film and the fastening screw in the projection screen according to some embodiments of the present application, and Fig. 56 is a schematic diagram of the third state of assembly of the display film and the fastening screw in the projection screen according to some embodiments of the present application. Specifically, as shown in Figs. 52 to 56, the side of the screen frame 120 is designed with a deep groove structure, and a counterbore hole is processed. The fastening screw 128 is used for fastening around the screen. The hole rod 124 is inserted into the synthetic cloth 112, the synthetic cloth 112 is in correspondence with the hole of the rod 124, and the corresponding position on the screen frame 120 has a threaded hole. After the synthetic cloth 112, the rod 124 and the threaded hole of the screen frame 120 are centered, the fastening screw 128 is installed on the screen frame 120. By designing the stroke size of the synthetic cloth 112, the display film 110 is continuously tensioned. During the fastening process, the fastening screw 128 contacts the rod 124 and drives the rod 124 to move. Then the rod 124 drives the cloth bag 1121 to move, and then the display film 110 is tensioned. Because the total length and total width of the synthetic cloth 112 are designed, the film is continuously tensioned during the fastening process, and the tensioning of the entire screen film is completed. Until the rod 124 is pushed into the designed rib position of the inner frame by the fastening screw 128, the position of the rod 124 is completely fixed inside the screen, and the tensioning process of the entire display film 110 is completed, and the stability is increased.

[0196] Fig. 57 is an exploded schematic diagram of the gap and the plug in the projection screen according to some embodiments of the present application, and Fig. 58 is an assembly schematic diagram of the gap and the plug in the projection screen according to some embodiments of the present application. As shown in Figs. 57 and 58, the gap 125 is formed on the side frame, and the gap 125 is located at the connection between the first side frame 121 and the second side frame 122. The rod 124 passes through the gap 125 to be installed into the side frame. In some embodiments, the screen frame 120 further includes the plug 126, and the plug 126 is plugged at the gap 125. It should be noted that the plug 126 is arranged, because the gap 125 is processed at the back corner of the screen, only four plugs 126 are needed to be installed at the corner position to decorate the appearance of the corner position.

[0197] The projection screen provided by some embodiments of the present application comprises a display film piece, the display film piece having a projection light receiving surface; a screen frame, the screen frame comprising two side frames, the two side frames being connected to surround the periphery of the display film piece, the side frame comprising a first side frame and a second side frame, the first side frame and the second side frame being rotationally connected, the second side frame comprising a first section and a second section; a connecting assembly, comprising: a rotational connecting piece, the first section and the second section being connected to the rotational connecting piece respectively; an adjusting piece, the adjusting piece being located between the first section and the second section, the rotational connecting piece being rotationally arranged on the adjusting piece and being movable on the adjusting piece, so that the distance between the first section and the second section is variable. Through the foldable design of the screen frame, the scattered projection screen is folded, which can reduce the household volume of the screen, realize convenient household entry, reduce the transportation and / or household volume, solve the problem of household entry of large-size screens, and on the other hand, the folding and fixing of the screen frame when assembled at the user's home is simple, the traditional hinge structure folding is removed, the rotational connecting piece is adopted, which is simpler and more ingenious, the cost is reduced, and the installation speed can be significantly improved. In addition, through the cooperation of the adjusting piece and the rotational connecting piece, the gap of the second side frame after assembly is reduced, so as to improve the stability after assembly.

[0198] In addition, as shown in FIGS. 34-58, some embodiments of the present application also provide a projection screen 2000, comprising:

[0199] a display film piece 110;

[0200] an integrated side frame, the integrated side frame surrounding the periphery of the display film piece 110, the integrated side frame comprising a first side frame 121 and a second side frame 122, the second side frame 122 comprising a first section 1221 and a second section 1222;

[0201] an adjusting rotational piece, the adjusting rotational piece being rotationally arranged between the first section 1221 and the second section 1222, so that the distance between the first section 1221 and the second section 1222 is variable.

[0202] The projection screen provided by some embodiments of the present application, through the foldable design of the screen frame, the scattered projection screen is folded, which can reduce the household volume of the screen, realize convenient household entry, reduce the transportation and / or household volume, solve the problem of household entry of large-size screens; on the other hand, the folding and fixing of the screen frame when assembled at the user's home is simple, the traditional hinge structure folding is removed, the rotational connecting piece is adopted, which is simpler and more ingenious, the cost is reduced, and the installation speed can be significantly improved, in addition, through the cooperation of the adjusting piece and the rotational connecting piece, the gap of the second side frame after assembly is reduced, so as to improve the stability after assembly.

[0203] In addition, some embodiments of the present application also provide a projection system, comprising a projection device and the projection screen 2000 described above, and the projection device is used to project a projection picture to the projection screen 2000. The projection system provided by the embodiments specifically comprises the projection device and the projection screen 2000 in any one of the foregoing embodiments, and the projection device is used to project a projection picture to the display film 110 of the projection screen 2000. The specific structure, working principle and function of the projection screen 2000 have been described in detail in the foregoing embodiment one, and will not be repeated here. Specifically, in the projection system of some embodiments of the present application, the projection device can be various projectors in the related art, such as a laser projector and the like. The projection device can project a projection picture to the display film 110 of the projection screen 2000, so that the display film 110 can display the projection picture for people to watch. The display film 110 in the projection screen 2000 can be an optical screen, and the display film 110 can be an optical film mainly composed of a Fresnel lens layer, for example, the display film 110 can comprise a diffusion layer, a substrate layer and a Fresnel lens layer (or a substrate layer, a diffusion layer and a Fresnel lens layer) which are sequentially stacked in the direction away from the projection screen 2000; wherein the substrate layer is a transparent film layer, when displaying an image, a light beam is emitted from the projection screen 2000, the light is dispersed by the diffusion layer, and then reflected on the surface of the Fresnel lens layer, so that the user can watch the image. Through the foldable design of the screen frame, the scattered projection screen is folded, which can reduce the household volume of the screen, realize convenient household, reduce the transportation and / or household volume, solve the problem of household of large-size screen; on the other hand, the folding and fixing of the screen frame when assembled by the user at home is simple, removes the traditional hinge structure folding, adopts a rotating connecting piece, which is simpler and more ingenious, reduces the cost, and can significantly improve the installation speed.

[0204] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0205] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they 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 application.

Claims

1. A projection screen, comprising: a screen frame having a bearing surface in an unfolded state, and comprising: two folding frames capable of forming a frame structure for supporting the screen in the unfolded state; each of the folding frames comprising: a long side portion comprising at least two sub-frame segments rotatable relative to each other; a short side portion connected to one end of the long side portion; a first rotating mechanism arranged between the at least two sub-frame segments and configured to drive the at least two sub-frame segments to fold or unfold about a first rotating axis parallel to the bearing surface, so as to change the overall length of the long side portion.

2. The projection screen of claim 1, wherein, the screen frame further comprising a second rotating mechanism arranged between the short side portion and the long side portion and configured to drive the short side portion and the long side portion to fold or unfold about a second rotating axis intersecting the bearing surface, wherein, after the folding frame is unfolded, the short side portion is perpendicular to the long side portion, and the axis of the at least two sub-frame segments coincide.

3. The projection screen of claim 1, wherein, in the same folding frame, the length of the sub-frame segment in the long side portion connected to the short side portion is greater than the length of the other sub-frame segment in the long side portion.

4. The projection screen of claim 1, wherein, in the same folding frame, the length of the sub-frame segment in the long side portion connected to the short side portion is equal to the length of the short side portion.

5. The projection screen according to any one of claims 1 to 4, wherein, the side of the folding frame away from the bearing surface has a plurality of bearing grooves, and the screen frame further comprises a plurality of sound emitting units corresponding to the plurality of bearing grooves, at least part of each of the sound emitting units being located in the corresponding bearing groove.

6. The projection screen of claim 5, wherein, the bottom surface of the bearing groove has a plurality of connecting holes, and the sound emitting unit has a plurality of buffer fixing members corresponding to the plurality of connecting holes; wherein at least part of each of the buffer fixing members is fixed in the corresponding connecting hole.

7. The projection screen of claim 5, wherein, the screen frame further comprises a decorative frame arranged around the two folding frames, the decorative frame having a plurality of sound emitting areas corresponding to the plurality of sound emitting units and the plurality of bearing grooves; wherein the sound emitting surface of each of the sound emitting units faces the corresponding sound emitting area, and each of the sound emitting areas has a plurality of sound emitting holes communicating with the corresponding bearing groove.

8. The projection screen of claim 5, wherein, the screen frame comprises a first long frame and a second long frame arranged opposite to each other; the first long frame comprises at least two sub-frame segments of the long side portion in one of the folding frames, and the second long frame comprises at least two sub-frame segments of the long side portion in the other folding frame; wherein each of the sub-frame segments in the first long frame has at least one bearing groove; both of the short side portions in the two folding frames have at least one bearing groove, and for the bearing grooves in the short side portions, the distance between the bearing groove and the first long frame is less than the distance between the bearing groove and the second long frame.

9. The projection screen of claim 6, wherein, the screen frame further comprises at least one connecting plate, both ends of the connecting plate being connected to the first long frame and the second long frame respectively; the connecting plate has a first wiring channel and a wire outlet communicating with the first wiring channel. The folding frame has a second wire channel in communication with the bearing groove, and the second wire channel is in communication with the first wire channel; The screen frame further comprises an audio line, one end of the audio line is connected with the sound unit, and the other end of the audio line sequentially passes through the first sub-channel and the second sub-channel and then passes out from the wire outlet.

10. The projection screen of any of claims 1-9, further comprising: A flexible curtain is attached to the bearing surface of the screen frame.

11. The projection screen of claim 1, wherein, The short side part comprises a first support frame and a second support frame, and the first support frame and the second support frame are respectively connected with two ends of the two long side parts. The projection screen further comprises: A sliding part is located between the two folding frames and is in sliding connection with the two folding frames. A flexible optical screen is attached to the bearing surface, and the flexible optical screen has two oppositely arranged first side edges and two oppositely arranged second side edges, two first side edges are respectively in sliding connection with two folding frames, one of two second side edges is connected with the first support frame, and the other of two second side edges is connected with the sliding part. The sliding part is configured to move relative to the two folding frames to expand or contract the flexible optical screen; after the flexible optical screen is in an expanded state, the sliding part is connected with the second support frame; after the flexible optical screen is in a contracted state, the flexible optical screen and the sliding part are located between the two sub-frame segments connected with the first support frame in the two long side parts.

12. The projection screen of claim 11, wherein, The flexible optical screen comprises: A flexible curtain has two first side edges and two second side edges; An optical film is connected to the side of the flexible curtain away from the bearing surface; A plurality of support bars are connected to the side of the flexible curtain away from the optical film, and the plurality of support bars are arranged at intervals in the extension direction of the folding frame. After the flexible optical screen is in a contracted state, the part of the optical film distributed between two adjacent support bars can be bent.

13. The projection screen of claim 12, wherein, The flexible curtain has a first hollow area in a central region, two ends of each support bar are respectively connected to the positions of the flexible curtain close to the two first side edges, and the part of each support bar located in the first hollow area is in contact with the optical film. Alternatively, the flexible curtain has a second hollow area distributed between two adjacent support bars.

14. The projection screen according to any one of claims 11 to 13, wherein, The sliding part comprises: A sliding frame, and A first support rod installed on the sliding frame; the sliding frame is located between the two folding frames and is in sliding connection with the two folding frames; the first support rod is connected with the second side edge of the two second side edges of the flexible optical screen away from the first support frame.

15. The projection screen of claim 14, wherein, The side of the folding frame facing the sliding frame has a sliding groove, and the part of the sliding frame facing the folding frame is located in the sliding groove and is in sliding connection with the sliding groove.

16. The projection screen of claim 14, wherein, The sliding part further comprises a plurality of elastic members arranged in sequence along the extending direction of the first support rod, one end of each elastic member being connected with the sliding frame, and the other end of each elastic member being connected with the first support rod.

17. The projection screen of claim 16, wherein, The screen frame further comprises at least two connecting members. After the flexible optical screen is in the unfolded state, the sliding frame is connected with the second support frame through the at least two connecting members, and the at least two connecting members are distributed on both sides of the first support rod in the extending direction of the first support rod.

18. The projection screen of claim 11, wherein, The short side part has a first accommodating cavity, the sub-frame segment has a second accommodating cavity, and the first support frame has a third accommodating cavity. The screen frame further comprises a second support rod suspendedly fixed in the first accommodating cavity, a third support rod suspendedly fixed in the second accommodating cavity, and a fourth support rod suspendedly fixed in the third accommodating cavity. The first side edge of the flexible optical screen is connected with the second support rod and the third support rod in a sliding manner, and the second side edge of the two second side edges of the flexible optical screen, which is away from the sliding part, is connected with the fourth support rod.

19. The projection screen of claim 1, further comprising: a display film having a projection light-receiving surface, and the screen frame surrounds the periphery of the display film; The first rotating mechanism comprises: a rotating connecting member, the at least two sub-frame segments are connected to the rotating connecting member respectively; and an adjusting member arranged between the at least two sub-frame segments, wherein the rotating connecting member is rotatably arranged on the adjusting member, and the rotating connecting member is adapted to move on the adjusting member so that the distance between the at least two sub-frame segments is variable; The short side part is rotatably connected with the long side part.

20. A laser projection display system, comprising: the projection screen according to any one of claims 1-19, and a projection device for projecting a projection picture to the projection screen.

Images