Folding back frame and display device

Abstract

The application relates to a folding back frame and a display device, wherein a first connecting end of a fixed connecting rod assembly is rotationally connected with a main connecting rod assembly, a second connecting end is rotationally connected with a display screen, a first rod end of a movable connecting rod assembly is rotationally and slidingly connected with the main connecting rod assembly, and a second rod end is rotationally connected with the display screen; when the first rod end is in a moving state, the relative distance between the main connecting rod assembly and the display screen is adjusted, and the first connecting end of the fixed connecting rod assembly is driven to rotate along the main connecting rod assembly. The folding and unfolding are realized in an elastic semi-automatic mode, the assembly can be completed without special tools, the use is efficient and convenient, the connection is firm, the disassembly and assembly are convenient and efficient, and the labor is saved; the folding back frame is integrated, the spare parts are not easy to be lost on a construction site, the space occupation is small, and the packaging and transportation are convenient; the folding back frame can be folded without being disassembled from the display screen, the overall display device volume is reduced after folding, and the use efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of splicing back frame, in particular to a folding back frame and a display device. BACKGROUND

[0002] There are more and more different scenes in which LED display screens are required to be installed. In the leasing industry, the display screen needs to be frequently disassembled and assembled. The display screen is supported by a back frame. The back frame is large in size. Usually, the back frame needs to be disassembled from the display screen and then transported separately. This is not only inconvenient, but also low in disassembly and assembly efficiency and easy to lose parts. SUMMARY

[0003] Therefore, it is necessary to provide a folding back frame and a display device.

[0004] In one embodiment, a folding back frame comprises a folding strut assembly;

[0005] The folding strut assembly comprises a main connecting rod assembly, a movable connecting rod assembly and a fixed connecting rod assembly;

[0006] The first connecting end of the fixed connecting rod assembly is rotationally connected with the main connecting rod assembly, and the second connecting end is used for rotationally connecting with the display screen;

[0007] The first rod end of the movable connecting rod assembly is rotationally and slidably connected with the main connecting rod assembly, and the second rod end is rotationally connected with the display screen;

[0008] The movable connecting rod assembly is used for adjusting the relative distance between the main connecting rod assembly and the display screen when the first rod end of the movable connecting rod assembly is in a moving state along the main connecting rod assembly, and driving the first connecting end of the fixed connecting rod assembly to rotate along the main connecting rod assembly.

[0009] The folding back frame has the following advantages. On the one hand, the folding back frame is designed by means of linkage sliding, so that the folding and unfolding are semi-automatically realized. The folding back frame can be assembled without special tools, is efficient and convenient to use, is firmly connected, is easy to disassemble and assemble, saves labor, and is not easy to lose parts. On the other hand, the folding back frame is designed in an integrated manner, so that the folding back frame occupies a small space and is easy to pack and transport. On the other hand, the folding back frame can be assembled in advance to form a display device. The display device can be folded without disassembling the folding back frame from the display screen. The display device is reduced in size after being folded, so that the display device is convenient to transport. The connection and disassembly operations of the folding back frame are reduced each time the display device is used or transported, so that the use efficiency and the assembly efficiency on the construction site are greatly improved.

[0010] In one of the embodiments, the folding support rod assembly further comprises a telescopic assembly, a fixed end of the telescopic assembly is fixed to the main connecting rod assembly, and a telescopic end is connected to the first rod end of the movable connecting rod assembly, so as to extend in a free state and drive the first rod end of the movable connecting rod assembly to move along the extension direction of the main connecting rod assembly.

[0011] In one of the embodiments, the first rod end of the movable connecting rod assembly is movably arranged along the extension direction of the main connecting rod assembly, so as to movably connect the first rod end with the main connecting rod assembly.

[0012] In one of the embodiments, the movable connecting rod assembly comprises a movable connecting rod and a sliding tube clamp.

[0013] The first rod end of the movable connecting rod is rotatably connected with the sliding tube clamp, and the sliding tube clamp is movably connected with the main connecting rod assembly.

[0014] The second rod end of the movable connecting rod is used to be rotatably connected with the display screen.

[0015] In one of the embodiments, the main connecting rod assembly or the main connecting rod thereof is provided with a second sliding groove, and the sliding tube clamp is limitingly slid in the second sliding groove.

[0016] In one of the embodiments, the folding back frame further comprises a frame structure, the frame structure is used to be connected on the display screen, the second connecting end of the fixed connecting rod assembly is rotatably connected with the frame structure, and the second rod end of the movable connecting rod assembly is rotatably connected with the frame structure.

[0017] In one of the embodiments, the folding back frame further comprises a first hanging lock assembly, a second hanging lock assembly, a first locking assembly and a second locking assembly which are fixed to the frame structure, the first hanging lock assembly and the second hanging lock assembly are arranged in a matched mode, the first hanging lock assembly is used to be connected with the second hanging lock assembly of other frame structures, so as to realize the upper and lower adjacent folding back frame splicing locking, and the first locking assembly and the second locking assembly are arranged in a matched mode, the first locking assembly is used to be connected with the second locking assembly of other folding back frames, so as to realize the left and right adjacent folding back frame splicing locking.

[0018] In one of the embodiments, the second rod end of the movable connecting rod assembly has two rotation dimensions relative to the display screen.

[0019] In one embodiment, the folding strut assembly further includes a connector; the second rod end of the moving connecting rod assembly is rotatably connected to the connector, the connector being rotatably connected to the display screen so that the second rod end has two rotational dimensions relative to the display screen, including a first rotational dimension of the connector rotating relative to the display screen, and a second rotational dimension of the second rod end rotating relative to the connector.

[0020] In one embodiment, a display device includes a display screen and a folding back frame as described in any embodiment, wherein a fixed connecting rod assembly and a movable connecting rod assembly of the folding support rod assembly of the folding back frame are respectively rotatably connected to the back frame of the display screen. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of an embodiment of the display device described in this application.

[0023] Figure 2 for Figure 1 Another schematic diagram of the embodiment shown.

[0024] Figure 3 for Figure 1 Assembly diagram of the embodiment shown.

[0025] Figure 4 for Figure 1 A schematic diagram of the display screen in the embodiment shown.

[0026] Figure 5 for Figure 1 An assembly diagram of another direction of the embodiment shown.

[0027] Figure 6 for Figure 5 An enlarged schematic diagram of point A in the illustrated embodiment.

[0028] Figure 7 This is a structural schematic diagram of an embodiment of the folding back frame with fasteners installed according to this application.

[0029] Figure 8 for Figure 7 Another schematic diagram of the embodiment shown.

[0030] Figure 9 for Figure 8The embodiment shown is installed with a display screen to obtain a structural schematic view of the display device.

[0031] Figure 10 For Figure 7 The structural exploded view of the embodiment shown.

[0032] Figure 11 For Figure 10 The assembly view of the embodiment shown.

[0033] Figure 12 The structural schematic view of an embodiment of the folding support rod assembly of the folding backrest described in the present application.

[0034] Figure 13 For Figure 12 The structural exploded view of the embodiment shown.

[0035] Figure 14 For Figure 13 The enlarged view at B of the embodiment shown.

[0036] Figure 15 For Figure 13 The enlarged view at C of the embodiment shown.

[0037] Figure 16 For Figure 15 The enlarged view at D of the embodiment shown.

[0038] Figure 17 For Figure 7 Another direction view of the embodiment shown.

[0039] Figure 18 For Figure 17 The enlarged view at E of the embodiment shown.

[0040] Figure 19 For Figure 17 Another direction view of the embodiment shown.

[0041] Reference signs:

[0042] Display device 100, display screen 200, folding backrest 300, fixing member 500;

[0043] LED display module 210, back frame 220;

[0044] First hanging lock assembly 310, hanging lock 311, hanging lock limiting screw 312;

[0045] Second hanging lock assembly 320, hanging lock lock box 321, hanging lock lock box fixing screw 322;

[0046] First locking assembly 330, arc lock seat 331, arc lock seat fixing screw 332;

[0047] Second locking assembly 340, zipper 341, zipper fixing screw 342;

[0048] Frame structure 350, concave avoiding area 351;

[0049] Folding support assembly 360, first mounting end 361, second mounting end 362, first rotation dimension 363, second rotation dimension 364;

[0050] Joint 370;

[0051] Rotary nut assembly 410, rotary limit shaft fixing screw 411, rotary limit shaft 412, rotary nut limit pin 413, rotary nut 414, rotary nut mounting seat 415;

[0052] Fixed connecting rod assembly 420, first rotation shaft pin 421, fixed connecting rod 422, first rotation shaft pin stop ring 423, ring-shaped connecting piece 424, fixed connecting rod fixing screw 425, first connecting end 427, second connecting end 428;

[0053] Movable connecting rod assembly 430, second rotation shaft pin 431, movable connecting rod 432, second rotation shaft pin stop ring 433, sliding tube clamp 434, tube clamp locking screw 435, first sliding groove 436, first rod end 437, second rod end 438;

[0054] Main connecting rod assembly 440, rotary nut assembly fixing screw 441, fixed connecting rod assembly fixing screw 442, sliding pin 443, main connecting rod 444, elastic sliding assembly fixing screw 445, threaded column fixing screw 446, second sliding groove 447, extension direction 448;

[0055] Rotary nut limit assembly 450, sliding limit block 451, limit block mounting cover 452, limit block mounting cover fixing screw 453, sliding push button 454, push button fixing screw 455, top spring 456;

[0056] Telescopic assembly 460, guide block fixing screw 461, sliding block 462, sliding block mounting seat 463, gas spring 464, gas spring mounting seat 465, fixed end 467, telescopic end 468;

[0057] Threaded column 470. DETAILED DESCRIPTION

[0058] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the detailed description of the specific embodiments of the present application is made below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways from those described herein without departing from the scope of the present application. It is therefore intended that the present application is not limited by the specific embodiments disclosed below.

[0059] It is to be noted that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or connected to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements or layers present. The use of the terms "on" and "connected to" in the present description are to be construed in the broadest sense and can include over, under, or adjacent.

[0060] In addition, the terms "first", "second", etc. are used herein only to describe various elements, but do not imply or suggest relative importance or a quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0061] In the present application, unless otherwise explicitly specified and limited, "on", "under", and "below" of a first feature to a second feature can be that the first feature is directly in contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, "over", "above", and "on top of" of a first feature to a second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. "Under", "below", and "underneath" of a first feature to a second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0062] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the associated listed items.

[0063] The application discloses a folding back frame and a display device, which comprises part or all of the following embodiments or technical features. In one embodiment of the application, a folding back frame comprises a folding strut assembly, the folding strut assembly comprises a main connecting rod assembly, a movable connecting rod assembly and a fixed connecting rod assembly, the first connecting end of the fixed connecting rod assembly is rotationally connected with the main connecting rod assembly, and the second connecting end is used for rotationally connecting with a display screen, the first rod end of the movable connecting rod assembly is rotationally and slidably connected with the main connecting rod assembly, and the second rod end is rotationally connected with the display screen, the movable connecting rod assembly is used for adjusting the relative distance between the main connecting rod assembly and the display screen when the first rod end is in a moving state along the main connecting rod assembly, and driving the first connecting end of the fixed connecting rod assembly to rotate along the main connecting rod assembly. The folding back frame is characterized in that: on the one hand, the linkage sliding cooperation design is adopted to realize the elastic semi-automatic use of folding and unfolding, the assembly can be completed without special tools, the use is efficient and convenient, the connection is firm, the disassembly and assembly are convenient and efficient, and the labor is saved; on the other hand, the integral design concept of the accessories is adopted to form the integral folding back frame, the accessories are not easy to be lost on the construction site, the space occupation is small, and the packaging and transportation are convenient; on the other hand, the display device can be assembled in advance, the folding back frame can be folded without being disassembled from the display screen, the overall display device is reduced in size after being folded, the overall transportation is convenient, the connecting and disassembly operations of the folding back frame are reduced each time the display device is used or transported, and the use efficiency and the assembly efficiency on the construction site can be greatly improved. The folding back frame and the display device will be described in detail below. Figures 1 to 19 The folding back frame and the display device will be described in detail below.

[0064] Further, in one embodiment, a display device 100 comprises a display screen 200 and the folding back frame 300 according to any embodiment, and is combined with the folding back frame 300. Figure 1 and Figure 2 The folding back frame and the display device will be described in detail below. Figure 3The folding support rod assembly 360 of the folding back frame 300 is rotationally connected with the display screen 200. In this embodiment, the folding back frame 300 is further provided with a frame structure 350, the folding support rod assembly 360 is rotationally connected with the frame structure 350, the frame structure 350 is connected with the back frame 220 of the display screen 200 through a fixing member 500, and the folding support rod assembly 360 is rotationally connected with the back frame 220. In other embodiments, the fixed connecting rod assembly 420 and the movable connecting rod assembly 430 of the folding support rod assembly 360 are respectively rotationally connected with the back frame 220 of the display screen 200. Further, in one of the embodiments, the fixing member 500 is a screw, for example, a hand screw or other screw. The hand screw is suitable for assembling the display device 100 on the construction site without tools, and the general screw is suitable for pre-assembling the display device 100, and only needs to be assembled on the construction site to form a large display system. In comparison, the traditional technology mainly adopts a fixing mode of locking screws or installing ring buckles through circular pipes or profiles, and special tools are needed for disassembly and assembly, and the construction personnel need to adjust and control on site, so that the work efficiency is low.

[0065] Further, in one of the embodiments, the display screen 200 further comprises an LED display module 210 mounted on the back frame 220, in this embodiment, the display screen 200 is an LED display screen, and the remaining embodiments are similar, which will not be described in detail, but it can be understood that the display screen 200 described in the present application includes but is not limited to the LED display screen, and can also be an OLED display screen or other display structure. Figure 4

[0066] Further, in one of the embodiments, a folding back frame 300 as shown in Figure 5 and Figure 6 comprises a folding support rod assembly 360; in this embodiment, the folding back frame 300 further comprises a frame structure 350, the frame structure 350 is connected with the display screen 200, for example, the back frame 220 of the display screen 200, through the fixing member 500; the folding support rod assembly 360 is rotationally connected with the frame structure 350, so as to realize the rotation connection between the folding support rod assembly 360 and the back frame 220, that is, part of the folding back frame 300 is rotatable relative to the display screen 200. The frame structure 350 and the folding support rod assembly 360 are also used for splicing with the frame structure 350 and the folding support rod assembly 360 of other folding back frames 300, so as to realize the regular splicing of multiple display screens 200. In other embodiments, the frame structure 350 can not be provided, and the folding support rod assembly 360 is directly connected with the display screen 200.

[0067] Further, in this embodiment, the display screen 200 is combined with​Figure 7 and Figure 8 The first mounting end 361 of the folding strut assembly 360 is used to connect with the second mounting end 362 of the folding strut assembly 360 of the other folding backrest 300. Further, the first mounting end 361 of the folding strut assembly 360 is used to be screwed, inserted or clamped, or at least two of the above connection modes, with the second mounting end 362 of the folding strut assembly 360 of the other folding backrest 300.

[0068] Further, in one embodiment, as shown in Figure 7 and Figure 8 The folding backrest 300 further comprises a first hanging lock assembly 310, a second hanging lock assembly 320, a first locking assembly 330 and a second locking assembly 340 fixed on the frame structure 350. The first hanging lock assembly 310 and the second hanging lock assembly 320 are arranged in matching mode. The first hanging lock assembly 310 is used to connect with the second hanging lock assembly 320 of the other folding backrest 300 to achieve the upper and lower adjacent folding backrest 300 splicing locking. The first locking assembly 330 and the second locking assembly 340 are arranged in matching mode. The first locking assembly 330 is used to connect with the second locking assembly 340 of the other folding backrest 300 to achieve the left and right adjacent folding backrest 300 splicing locking. In combination with Figure 9 Such a structure design is beneficial for forming a large display system with matrix arrangement of the display screen 200, and on the other hand, part or even most of the gravity can be borne by the first hanging lock assembly 310 and the second hanging lock assembly 320 through the frame structure 350 in series connection, while the folding strut assembly 360 can be slightly stressed and / or oriented.

[0069] Further, in one embodiment, in combination with Figure 10 and Figure 11The first hanging lock assembly 310 includes a hanging lock 311 and a hanging lock limiting screw 312, and the hanging lock 311 is fixed to the frame structure 350 by the hanging lock limiting screw 312; the second hanging lock assembly 320 includes a hanging lock lock box 321 and a hanging lock lock box fixing screw 322, and the hanging lock lock box 321 is fixed to the frame structure 350 by the hanging lock lock box fixing screw 322; the hanging lock 311 and the hanging lock lock box 321 are arranged in matching mode, and the hanging lock 311 is used to be connected with the hanging lock lock box 321 of other folding back frame 300 to realize the upper and lower adjacent folding back frame 300 splicing locking. When the weight of the display screen 200 is large, the hanging lock 311 and the hanging lock lock box 321 can be appropriately thickened, and similarly, the frame structure 350 can also be appropriately thickened to ensure the stability and safety of the structure.

[0070] In the embodiment, the frame structure 350 has a center of symmetry; the first hanging lock assembly 310 and the second hanging lock assembly 320 are symmetrically arranged relative to the center of symmetry; and the first locking assembly 330 and the second locking assembly 340 are symmetrically arranged relative to the center of symmetry. Further, in one of the embodiments, the frame structure 350 has two mutually perpendicular symmetry lines, the first hanging lock assembly 310 and the second hanging lock assembly 320 are located on one of the symmetry lines, and the first locking assembly 330 and the second locking assembly 340 are located on the other symmetry line. Considering the structural difference, it can also be understood that the center or gravity center of the first hanging lock assembly 310 and the center or gravity center of the second hanging lock assembly 320 are located on one of the symmetry lines, and the center or gravity center of the first locking assembly 330 and the center or gravity center of the second locking assembly 340 are located on the other symmetry line to realize the stability and consistency of the display device 100 splicing.

[0071] Further, in one of the embodiments, as shown in FIG. 1, the first hanging lock assembly 310 and the second hanging lock assembly 320 are arranged on the left side of the frame structure 350, and the first locking assembly 330 and the second locking assembly 340 are arranged on the right side of the frame structure 350. Figure 10 and Figure 11As shown, the first locking assembly 330 is an arc lock assembly, including an arc lock seat 331 and an arc lock seat fixing screw 332, the arc lock seat 331 is fixed on the frame structure 350 by the arc lock seat fixing screw 332, the arc lock seat 331 is used to install an arc lock, and the arc lock seat 331 is used to connect with the second locking assembly 340 of the other folding backrest 300; and / or, the second locking assembly 340 is a zipper lock assembly, including a zipper lock 341 and a zipper lock fixing screw 342, the zipper lock 341 is fixed on the frame structure 350 by the zipper lock fixing screw 342, the zipper lock 341 is used to connect with the first locking assembly 330 of the other folding backrest 300. Further, in one embodiment, the first locking assembly 330 is an arc lock assembly, and the second locking assembly 340 is a zipper lock assembly; the arc lock seat 331 is used to connect with the zipper lock 341 of the other folding backrest 300. The remaining embodiments are similar, and are not described here. Such a structure design can cooperate with the arc lock to adjust the relative angle of the display surface of the display device 100, so that an arc-shaped display structure, also known as an arc-shaped screen, can be obtained.

[0072] Further, in one embodiment, the folding support rod assembly 360 is as shown in Figure 12 and Figure 13 including a main connecting rod assembly 440, a movable connecting rod assembly 430, and a fixed connecting rod assembly 420; further, in one embodiment, one end of the fixed connecting rod assembly 420 and the movable connecting rod assembly 430 is rotationally connected with the main connecting rod assembly 440. In this embodiment, the number of fixed connecting rod assemblies 420 is two; in other embodiments, the folding support rod assembly 360 can also include one fixed connecting rod assembly 420 or more fixed connecting rod assemblies 420.

[0073] Further, in one embodiment, at least two fixed connecting rod assemblies 420 are located in the same orientation relative to the main connecting rod assembly 440, that is, in a plane perpendicular to the extension direction 448 of the main connecting rod assembly 440, the projections of each fixed connecting rod assembly 420 coincide, so that the connection position of each fixed connecting rod assembly 420 to the frame structure 350 matches the rotation adjustment of the movable connecting rod assembly 430, ensuring that the linkage sliding mechanism of the folding backrest 300 realizes elastic semi-automatic use in folding and unfolding.

[0074] In combination with Figure 14 and Figure 15, the first connecting end 427 of the fixed connecting rod assembly 420 is rotatably connected with the main connecting rod assembly 440, and the second connecting end 428 is used to be rotatably connected with the display screen 200. For the embodiment with the frame structure 350, the second connecting end 428 of the fixed connecting rod assembly 420 is rotatably connected with the frame structure 350, so as to be rotatably connected with the display screen 200 through the frame structure 350. The first rod end 437 of the movable connecting rod assembly 430 is rotatably and slidably connected with the main connecting rod assembly 440, and the second rod end 438 is rotatably connected with the display screen 200. For the embodiment with the frame structure 350, the second rod end 438 of the movable connecting rod assembly 430 is rotatably connected with the frame structure 350, so as to be rotatably connected with the display screen 200 through the frame structure 350. Moreover, the movable connecting rod assembly 430 is used to adjust the relative distance between the main connecting rod assembly 440 and the display screen 200 when the first rod end 437 is in a moving state along the main connecting rod assembly 440, and drive the first connecting end 427 of the fixed connecting rod assembly 420 to rotate along the main connecting rod assembly 440. The moving state includes rotation and sliding, etc. In the embodiment, the second rod end 438 of the movable connecting rod assembly 430 has two rotation dimensions relative to the display screen 200, so as to realize the adjustment of the rotation angle and the sliding position. Further, the first rod end 437 of the movable connecting rod assembly 430 can move along the extension direction 448 of the main connecting rod assembly 440, and the second rod end 438 has two rotation dimensions relative to the frame structure 350, so as to adjust the relative distance between the main connecting rod assembly 440 and the frame structure 350 when the first rod end 437 is in a moving state.

[0075] In this embodiment, the folding strut assembly 360 further comprises a telescopic assembly 460, which is fixed to or installed in the main connecting rod assembly 440. The fixed end 467 of the telescopic assembly 460 is fixed to the main connecting rod assembly 440, and the telescopic end 468 is connected to the first rod end 437 of the movable connecting rod assembly 430 to drive the first rod end 437 to move along the extension direction 448 of the main connecting rod assembly 440 in a free state. For the embodiment with the sliding tube clamp 434, the fixed end 467 of the telescopic assembly 460 is fixed to the main connecting rod assembly 440, and the telescopic end 468 is connected to the sliding tube clamp 434 to drive the first rod end 437 to move along the extension direction 448 of the main connecting rod assembly 440 in a free state. The telescopic end 468 is connected to the sliding tube clamp 434. In this way, the telescopic sliding design is achieved, and the folding and unfolding are realized in an elastic semi-automatic manner. For example, when the telescopic end 468 of the telescopic assembly 460 is compressed under stress, the relative distance between the main connecting rod assembly 440 and the frame structure 350 is reduced, and the folding of the folding backrest 300 is realized. When the restriction on the telescopic end 468 of the telescopic assembly 460 is released, the telescopic end 468 is in a free state, and the telescopic end 468 is elongated to drive the first rod end 437 of the movable connecting rod assembly 430 to move along the extension direction 448 of the main connecting rod assembly 440, thereby realizing the unfolding of the folding backrest 300. Since the telescopic end 468 is compressed under stress and stretched when the restriction is released, it is called elastic semi-automatic use. In this way, the assembly can be completed without special tools on the construction site, which is efficient, convenient, reliable, easy to disassemble and assemble, and saves labor.

[0076] In one embodiment, the first rod end 437 of the movable connecting rod assembly 430 is movably arranged along the extension direction 448 of the main connecting rod assembly 440, so that the first rod end 437 is movably connected to the main connecting rod assembly 440. Further, in one embodiment, the first rod end 437 of the movable connecting rod assembly 430 is located between the first connecting ends 427 of the two fixed connecting rod assemblies 420. Further, in one embodiment, the main connecting rod assembly 440 is used to connect with the main connecting rod assembly 440 of another folding backrest 300 to realize the splicing of the folding strut assemblies 360 of the upper and lower adjacent folding backrests 300. Further, in one embodiment, the main connecting rod assembly 440 is used to be screw-fixed with the main connecting rod assembly 440 of another folding backrest 300 to realize the splicing of the folding strut assemblies 360 of the upper and lower adjacent folding backrests 300. In this way, the folding strut assembly 360 can be used for positioning and docking.

[0077] Further, in one of the embodiments, the folding strut assembly 360 further comprises a rotating nut assembly 410, a rotating nut limiting assembly 450 and a threaded column 470; the rotating nut assembly 410 is fixed to the first end of the main connecting rod assembly 440, the rotating nut limiting assembly 450 and the threaded column 470 are fixed to the second end of the main connecting rod assembly 440; the rotating nut assembly 410 is used to be screwed with the threaded column 470 of the other folding back frame 300, and is limited in the rotating nut limiting assembly 450, so as to realize the splicing of the folding strut assemblies 360 of the upper and lower adjacent folding back frames 300.

[0078] Further, in one of the embodiments, the rotating nut assembly 410 comprises a rotating limiting shaft fixing screw 411, a rotating limiting shaft 412, a rotating nut limiting pin 413, a rotating nut 414 and a rotating nut mounting seat 415; the rotating nut mounting seat 415 is fixed to the first end of the main connecting rod assembly 440 or the main connecting rod 444 of the main connecting rod assembly 440 by the rotating nut assembly fixing screw 441, the rotating nut 414 is sleeved outside the rotating nut mounting seat 415 and is rotatably arranged relative to the rotating nut mounting seat 415, the rotating nut 414 is used to be screwed with the threaded column 470 of the other folding back frame 300, and the extreme position of the screwing is limited by the rotating nut limiting assembly 450 of the other folding back frame 300; the rotating limiting shaft 412 is installed in the rotating nut mounting seat 415 by the rotating limiting shaft fixing screw 411, the rotating limiting shaft 412 is provided with a limiting groove, the rotating nut 414 is limited in the limiting groove by the rotating nut limiting pin 413, that is, the rotating nut limiting pin 413 is connected with the rotating nut 414 and is limited in the limiting groove, the position of the rotating nut 414 is limited by the rotating limiting shaft 412 and the limiting groove therein, so as to avoid the rotating nut 414 from being taken out of the rotating nut mounting seat 415. Such a structure design is conducive to realizing the mutual connection of the adjacent main connecting rod assemblies 440.

[0079] Further, in one of the embodiments, the main connecting rod assembly 440 comprises a rotating nut assembly fixing screw 441, a fixed connecting rod assembly fixing screw 442, a main connecting rod 444, an elastic sliding assembly fixing screw 445, and a threaded column fixing screw 446; the rotating nut assembly 410 is fixed to the first end of the main connecting rod assembly 440 through the rotating nut assembly fixing screw 441; the ring-shaped connecting piece 424 of the fixed connecting rod assembly 420 is fixed to the main connecting rod 444 through the fixed connecting rod assembly fixing screw 442, and the first connecting end 427 of the fixed connecting rod assembly 420 is rotationally connected with the ring-shaped connecting piece 424; the first rod end 437 of the movable connecting rod assembly 430 is rotationally connected with the main connecting rod 444; the fixed end 467 of the telescopic assembly 460 is fixed to the main connecting rod 444 and adjacent to the second end of the main connecting rod 444; the rotating nut limiting assembly 450 is fixed to the second end of the main connecting rod 444; the threaded column 470 is fixed to the second end of the main connecting rod 444 through the threaded column fixing screw 446. Further, in one of the embodiments, the telescopic assembly 460 is at least partially accommodated in the interior of the main connecting rod 444. Further, in one of the embodiments, the main connecting rod assembly 440 further comprises a sliding pin 443, the telescopic end 468 of the telescopic assembly 460 is connected with the first rod end 437 of the movable connecting rod assembly 430 through the sliding pin 443 and slides along the second sliding groove 447 of the main connecting rod 444, so that the first rod end 437 of the movable connecting rod assembly 430 can move along the extension direction 448 of the main connecting rod assembly 440. Such a structural design is conducive to cooperating to realize the connecting rod sliding mechanism, taking the main connecting rod assembly 440 as the main connecting rod, taking the fixed connecting rod assembly 420 and the movable connecting rod assembly 430 as auxiliary connecting rods, and cooperating to realize the folding or unfolding of the folding back frame 300.

[0080] Further, in one embodiment, the fixed connecting rod assembly 420 includes a first rotating shaft pin 421, a fixed connecting rod 422, a first rotating shaft pin stopper 423, a ring-shaped connector 424, and a fixed connecting rod fixing screw 425. The first connecting end 427 of the fixed connecting rod 422 is rotatably connected with the ring-shaped connector 424, the ring-shaped connector 424 is installed on the frame structure 350, and the fixed connecting rod fixing screw 425 locks the ring-shaped connector 424 to limit the position of the ring-shaped connector 424 in the extension direction 448. The second connecting end 428 of the fixed connecting rod 422 is rotatably connected with the main connecting rod assembly 440 through the first rotating shaft pin 421, and the first rotating shaft pin stopper 423 is clamped on the first rotating shaft pin 421 to limit the position of the first rotating shaft pin 421. The fixed connecting rod assembly 420 not only limits the position of the frame structure 350, but also cooperates with the movable connecting rod assembly 430 to realize the folding or unfolding of the folding backrest 300.

[0081] In one embodiment, the movable connecting rod assembly 430 includes a movable connecting rod 432 and a sliding tube clamp 434. The first rod end 437 of the movable connecting rod 432 is rotatably connected with the sliding tube clamp 434, and the sliding tube clamp 434 is movably connected with the main connecting rod assembly 440. The second rod end 438 of the movable connecting rod 432 is used to be rotatably connected with the display screen 200. Further, in one embodiment, the sliding tube clamp 434 is clamped on the main connecting rod assembly 440 or the main connecting rod 444 of the main connecting rod assembly 440, and the sliding tube clamp 434 can move along the extension direction 448 of the main connecting rod assembly 440 in a relaxed state. In this embodiment, the main connecting rod assembly 440 or the main connecting rod 444 thereof is provided with a second sliding groove 447, and the sliding tube clamp 434 is limited to slide in the second sliding groove 447. Through the cooperation of the sliding tube clamp 434 and the main connecting rod assembly 440 and the second sliding groove 447 thereof, the first rod end 437 of the movable connecting rod assembly 430 is rotatably and movably connected with the main connecting rod assembly 440.

[0082] Further, in one embodiment, the movable connecting rod assembly 430 comprises a second rotating shaft pin 431, a movable connecting rod 432, a second rotating shaft pin stopper 433, a sliding tube clamp 434, and a tube clamp locking screw 435; a first rod end 437 of the movable connecting rod 432 is rotatably connected with the sliding tube clamp 434 through the second rotating shaft pin 431, and a telescopic end 468 of the telescopic assembly 460 is connected with the sliding tube clamp 434; the sliding tube clamp 434 is clamped on the main connecting rod assembly 440 or the main connecting rod 444 of the main connecting rod assembly 440, and in a relaxed state, the sliding tube clamp 434 can move along an extension direction 448 of the main connecting rod assembly 440; the tube clamp locking screw 435 is installed on the sliding tube clamp 434, and is used for adjusting the locking or relaxation of the sliding tube clamp 434 relative to the main connecting rod assembly 440; a second rod end 438 of the movable connecting rod 432 is rotatably connected with the frame structure 350 and has two rotating dimensions relative to the frame structure 350, so as to adjust the relative distance between the main connecting rod assembly 440 and the frame structure 350 when the first rod end 437 is moved by the sliding tube clamp 434; each second rotating shaft pin stopper 433 is clamped on the second rotating shaft pin 431, so as to limit the position of the second rotating shaft pin 431. Through the rotation and movement of the movable connecting rod assembly 430, the relative distance between the main connecting rod assembly 440 or the main connecting rod 444 thereof and the frame structure 350 changes, so that the folding or unfolding of the folding back frame 300 is realized.

[0083] Further, in one of the embodiments, the pipe clamp locking screw 435 is a pipe clamp locking handle screw. Further, in one of the embodiments, the sliding pipe clamp 434 is slidable along the extension direction 448 of the main connecting rod assembly 440 in a relaxed state; further, the sliding pipe clamp 434 is provided with a first sliding slot 436; the telescopic end 468 of the telescopic assembly 460 is connected with a sliding pin 443, which is slidingly arranged in the first sliding slot 436 and a second sliding slot 447 of the main connecting rod 444; the telescopic end 468 of the telescopic assembly 460 is connected with the sliding pipe clamp 434 through the sliding pin 443, so as to drive the sliding pipe clamp 434 to move along the extension direction 448 of the main connecting rod assembly 440 in a free state, and make the sliding pipe clamp 434 limit sliding in the second sliding slot 447. Such design, on the one hand, realizes the rotation of the sliding pipe clamp 434 relative to the main connecting rod assembly 440 or the main connecting rod 444 thereof through the sliding of the sliding pin 443 in the first sliding slot 436, and on the other hand, realizes the axial movement of the sliding pipe clamp 434 relative to the main connecting rod assembly 440 or the main connecting rod 444 thereof through the sliding of the sliding pin 443 in the second sliding slot 447, so that the relative distance between the main connecting rod assembly 440 or the main connecting rod 444 thereof and the frame structure 350 changes, thereby realizing the folding or unfolding of the folding backrest 300.

[0084] Further, in one of the embodiments, the telescopic assembly 460 is arranged inside the main connecting rod assembly 440 or the main connecting rod 444 of the main connecting rod assembly 440; further, the telescopic assembly 460 is a gas spring sliding assembly. Further, in one of the embodiments, the telescopic assembly 460 comprises a sliding block 462, a sliding block mounting seat 463, a gas spring 464 and a gas spring mounting seat 465; the gas spring mounting seat 465 is fixed to the main connecting rod assembly 440 or the main connecting rod 444 of the main connecting rod assembly 440; the fixed end 467 of the gas spring 464 is fixed to the gas spring mounting seat 465; the sliding block 462 is fixed to the sliding block mounting seat 463, the sliding block mounting seat 463 is fixed to the telescopic end 468 of the gas spring 464, and the sliding block mounting seat 463 is connected with the sliding pipe clamp 434. Such design can drive the sliding pipe clamp 434 through the telescopic assembly 460, and drive the first rod end 437 of the movable connecting rod assembly 430 to rotate and move relative to the main connecting rod assembly 440.

[0085] Further, in one of the embodiments, the telescopic assembly 460 comprises a guide block fixing screw 461, a sliding block 462, a sliding block mounting seat 463, a gas spring 464 and a gas spring mounting seat 465; the gas spring mounting seat 465 is fixed to the main connecting rod assembly 440 or the main connecting rod 444 of the main connecting rod assembly 440 by the elastic sliding assembly fixing screw 445; the fixed end 467 of the gas spring 464 is fixed to the gas spring mounting seat 465; the sliding block 462 is fixed to the sliding block mounting seat 463 by the guide block fixing screw 461, the sliding block mounting seat 463 is fixed to the telescopic end 468 of the gas spring 464, and the sliding block mounting seat 463 is connected to the first rod end 437 of the movable connecting rod assembly 430. Further, in one of the embodiments, the guide block fixing screw 461 is a nylon guide block fixing screw, and the sliding block 462 is a nylon sliding block. In addition to the gas spring 464, other elastic structural members can also be used to achieve the same function. The telescopic assembly 460 is designed to be accommodated inside the main connecting rod assembly 440 or the main connecting rod 444 thereof, which is beneficial to the design concept of integrated accessories and forms an overall folding back frame.

[0086] Further, in one of the embodiments, as shown in Figure 16 the rotating nut limiting assembly 450 comprises a sliding limiting block 451, a limiting block mounting cover 452, a limiting block mounting cover fixing screw 453, a sliding push button 454, a push button fixing screw 455 and a top spring 456; the limiting block mounting cover 452 is fixed to the second end of the main connecting rod assembly 440 or the main connecting rod 444 of the main connecting rod assembly 440 by the limiting block mounting cover fixing screw 453; the sliding limiting block 451 is accommodated in the limiting block mounting cover 452 and elastically abuts against the inner wall of the limiting block mounting cover 452 by the top spring 456; the sliding push button 454 is screwed with the sliding limiting block 451 by the push button fixing screw 455; under the action of the top spring 456, when the rotating nut 413 is rotated to the corresponding position of the limiting groove of the rotating limiting shaft 412, the sliding limiting block 451 is inserted into the limiting groove, achieving the anti-loosening effect.

[0087] Further, in one of the embodiments, as shown in Figure 17 and Figure 18As shown, the folding back frame 300 further comprises a joint 370; the second rod end 438 of the dynamic connecting rod assembly 430 is rotationally connected with the joint 370, and the joint 370 is rotationally connected with the frame structure 350, for example, through the frame structure 350 and the display screen 200, so that the second rod end 438 of the dynamic connecting rod assembly 430 has two rotation dimensions relative to the display screen 200 or the frame structure 350, including a first rotation dimension 363 of the joint 370 relative to the display screen 200 or the frame structure 350, and a second rotation dimension 364 of the second rod end 438 of the dynamic connecting rod assembly 430 relative to the joint 370.

[0088] Further, in one of the embodiments, the folding back frame 300 further comprises a joint 370 and a rotation assembly; the second rod end 438 of the dynamic connecting rod assembly 430 is rotationally connected with the joint 370 through the rotation assembly, and the joint 370 is rotationally connected with the frame structure 350 through another rotation assembly, so that the second rod end 438 of the dynamic connecting rod assembly 430 has the first rotation dimension 363 of the joint 370 relative to the frame structure 350, and the second rotation dimension 364 of the second rod end 438 of the dynamic connecting rod assembly 430 relative to the joint 370; the first connecting end 427 of the fixed connecting rod assembly 420 is rotationally connected with the frame structure 350 through still another rotation assembly, so that the first connecting end 427 of the fixed connecting rod assembly 420 rotates relative to the main connecting rod assembly 440 to realize the following motion of the fixed connecting rod assembly 420, in a state that the main connecting rod assembly 440 is driven by the dynamic connecting rod assembly 430 to adjust the relative distance between the main connecting rod assembly 440 and the frame structure 350. In this way, the structure design that the second rod end 438 has two rotation dimensions relative to the frame structure 350 can be realized.

[0089] Further, in one of the embodiments, as shown, Figure 19 The frame structure 350 forms a concave avoiding area 351 towards the folding support rod assembly 360, so that the frame structure 350 has avoiding space on the side away from the folding support rod assembly 360, for avoiding some circuits and components of the display screen 200 away from the display surface.

[0090] In the following, specific examples of the folding back frame 300 will be given in combination with Figures 1 to 19 Further, in one of the embodiments, the folding back frame 300 is fixed on the display screen 200, for example, an LED display screen having the LED display module 210, through the fixing member 400, for example, customized screws or conventional screws, so that the display device 100 can be obtained.

[0091] The main body of the folding back frame 300 is a frame structure 350, for example, a reinforcing frame, which is provided with a first hanging lock assembly 310 and a second hanging lock assembly 320 above and below. The hanging lock 311 of the first hanging lock assembly 310 and the hanging lock lock box 321 of the second hanging lock assembly 320 are spliced and locked, so as to realize the splicing and locking of adjacent folding back frames 300 above and below. It can be understood that here, up and down are only a description of the relative position relationship, and are not a specific limitation on the position of the first hanging lock assembly 310 and the second hanging lock assembly 320. The positions of the first hanging lock assembly 310 and the second hanging lock assembly 320 are interchangeable, which does not affect the realization of the folding back frame 300 described in the application.

[0092] The frame structure 350 is provided with a first locking assembly 330 and a second locking assembly 340 on the left and right sides. The curvature lock seat 331 of the first locking assembly 330 cooperates with the pull lock 341 of the second locking assembly 340 to realize the splicing and locking of adjacent folding back frames 300 on the left and right sides. Similarly, here, left and right are only a description of the relative position relationship, and are not a specific limitation on the position of the first locking assembly 330 and the second locking assembly 340. The positions of the first locking assembly 330 and the second locking assembly 340 are interchangeable, which does not affect the realization of the folding back frame 300 described in the application.

[0093] The frame structure 350 is provided with a folding support rod assembly 360 on the back. The folding support rod assembly 360 is fixedly connected to the frame structure 350 of the folding back frame 300 through a joint 370 and a rotating assembly. It can be understood that here, the fixed connection is a relative fixed relationship. In some states, for example, the state of packing and transporting or the state of completed installation, the folding support rod assembly 360 is fixedly connected to the frame structure 350, while in the assembly state or the adjustment state, the folding support rod assembly 360 is rotatably arranged relative to the frame structure 350. The rotating assembly includes a first rotating shaft pin 421 and a first rotating shaft pin stop ring 423, a second rotating shaft pin 431 and a second rotating shaft pin stop ring 433, and other parts. Specifically, the movable connecting rod assembly 430 of the folding support rod assembly 360 is rotatably connected to the frame structure 350 through the joint 370 and the rotating assembly, and the fixed connecting rod assembly 420 of the folding support rod assembly 360 is rotatably connected to the frame structure 350 through the rotating assembly.

[0094] The main body of the folding support rod assembly 360 is a main connecting rod 444 of a main connecting rod assembly 440. The main connecting rod 444 has an upper and lower connecting function, and is also called an upper and lower connecting rod. The top of the main connecting rod 444 is provided with a rotating nut assembly 410, and the bottom is provided with a threaded column 470. The main connecting rod 444 of the folding support rod assembly 360 can be threadedly connected with the threaded column 470 through the rotating nut 413, and the upper and lower connection is fixed by the rotating nut limiting assembly 450 at the bottom. The sliding limiting block 451 for fixing the upper and lower connection is driven by the top spring 456. When the rotating nut 413 is rotated to the position of the limiting groove in the rotating limiting shaft 412, the sliding limiting block 451 is inserted into the limiting groove, achieving the anti-loose effect.

[0095] The folding support rod assembly 360 is arranged on the left and right sides of the main connecting rod 444. Two fixed connecting rod assemblies 420 are arranged on the left side. The main connecting rod 444 rotates around the axis of the rotating pin 421 to perform a fixed radius rotation. The right side of the folding support rod assembly 360 is provided with a movable connecting rod assembly 430. One end of the movable connecting rod 432 in the movable connecting rod assembly 430, i.e., the second rod end 438, is connected with the folding back frame 300 through the joint 370. The other end, i.e., the first rod end 437, is connected with the main connecting rod 444 through the sliding pipe clamp 434, forming a driven part.

[0096] The folding support rod assembly 360 forms a connecting rod sliding mechanism, including the fixed connecting rod assembly 420 and its fixed connecting rod 422, the movable connecting rod assembly 430 and its movable connecting rod 432, the main connecting rod assembly 440 and its main connecting rod 444, and the elastic member of the telescopic assembly 460, such as the gas spring 464. With respect to the movable connecting rod assembly 430 and its movable connecting rod 432 as the driven part, the telescopic assembly 460 is the driving part in the connecting rod sliding mechanism of the folding support rod assembly 360. One end of the gas spring 464 is fixed as the fixed end 467 through the gas spring mounting seat 465 on the main connecting rod 444. The other end of the gas spring 464 is the telescopic end 468. The telescopic end 468 is fixed with the sliding block mounting seat 463. The sliding block mounting seat 463 is fixed with the sliding block 462. The sliding block mounting seat 463 is driven by the sliding block 462 to slide in the inner wall of the main connecting rod 444 under the thrust of the gas spring 464. The sliding pins 443 are fixed on both sides of the sliding block mounting seat 463. The sliding pins 443 are fitted in the first sliding groove 436 and the second sliding groove 447 in the sliding pipe clamp 434. When the sliding block mounting seat 463 moves under the thrust of the gas spring 464, the sliding pipe clamp 434 is driven to move by the sliding pins 443, including the sliding pipe clamp 434 moving up and down along the second sliding groove 447, and the sliding pipe clamp 434 rotating along the first sliding groove 436.

[0097] And, the sliding pipe clamp 434 is provided with a pipe clamp locking handle screw 435, and the sliding pipe clamp 434 is loosened or tightened by rotating the handle of the pipe clamp locking handle screw 435, so as to limit the sliding and rotation of the sliding pipe clamp 434, thereby fixing and limiting the rotation folding of the folding support rod assembly 360 and the movable connecting rod assembly 430 thereof. That is, in the state that the pipe clamp locking handle screw 435 locks the sliding pipe clamp 434, the sliding pipe clamp 434 tightly clamps on the main connecting rod 444, at this time, the movable connecting rod 432 of the movable connecting rod assembly 430 can theoretically rotate, but the movable connecting rod 432 cannot rotate because the sliding pipe clamp 434 cannot rotate, so the movable connecting rod assembly 430 and the movable connecting rod 432 thereof cannot rotate, and the folding support rod assembly 360 is in a locked state; in the state that the pipe clamp locking handle screw 435 loosens the sliding pipe clamp 434, the sliding pipe clamp 434 can rotate on the main connecting rod 444, so the movable connecting rod assembly 430 and the movable connecting rod 432 thereof can rotate, realizing the linkage sliding mechanism design, and the folding back frame 300 and the folding support rod assembly 360 thereof are easily and quickly controlled to fold or unfold by the pipe clamp locking handle screw 435.

[0098] Such a structure design can make the whole LED display screen structure system connection safe and reliable, tool-free, semi-automatically used, easily disassembled and assembled with high efficiency, save labor, and the folding back frame 300 as a reinforced back frame can be designed in a foldable integrated manner, so that the parts are not easy to be lost on the construction site, the space occupied is small, packaging and transportation are convenient, the display device can be easily assembled in advance, transportation is convenient, and the assembly efficiency on the construction site is improved.

[0099] It should be noted that other embodiments of the present application also include the foldable back frame and the display device formed by the combination of the technical features in the above embodiments.

[0100] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0101] The above embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A foldable backrest (300) characterized by, The folding support rod assembly (360) comprises a main connecting rod assembly (440), a movable connecting rod assembly (430) and a fixed connecting rod assembly (420); The first connecting end (427) of the fixed connecting rod assembly (420) is rotationally connected with the main connecting rod assembly (440), and the second connecting end (428) is used for rotationally connecting with the display screen (200); The first rod end (437) of the movable connecting rod assembly (430) is rotationally and slidingly connected with the main connecting rod assembly (440), and the second rod end (438) is rotationally connected with the display screen (200); The movable connecting rod assembly (430) is used for adjusting the relative distance between the main connecting rod assembly (440) and the display screen (200) when the first rod end (437) moves along the main connecting rod assembly (440) in a moving state, and driving the first connecting end (427) of the fixed connecting rod assembly (420) to rotate along the main connecting rod assembly (440); The first rod end (437) of the movable connecting rod assembly (430) is movably arranged along the extension direction (448) of the main connecting rod assembly (440), so that the first rod end (437) is movably connected with the main connecting rod assembly (440). The movable connecting rod assembly (430) comprises a movable connecting rod (432) and a sliding tube clamp (434); 2. The folding backrest (300) according to claim 1, characterized in that The first rod end (437) of the movable connecting rod (432) is rotationally connected with the sliding tube clamp (434), and the sliding tube clamp (434) is movably connected with the main connecting rod assembly (440); 3. The foldable backrest (300) according to claim 1, characterized in that, The second rod end (438) of the movable connecting rod (432) is used for rotationally connecting with the display screen (200); The main connecting rod assembly (440) is provided with a second sliding groove (447), and the sliding tube clamp (434) is limitingly and slidingly arranged in the second sliding groove (447). The frame structure (350) is used for being connected on the display screen (200); The second connecting end (428) of the fixed connecting rod assembly (420) is rotationally connected with the frame structure (350); 4. The foldable backrest (300) according to claim 1, characterized in that, The second rod end (438) of the movable connecting rod assembly (430) is rotationally connected with the frame structure (350). The first hanging lock assembly (310), the second hanging lock assembly (320), the first locking assembly (330) and the second locking assembly (340) are fixed on the frame structure (350); ​ 5. The foldable backrest (300) according to claim 4, characterized in that, ​ The first hanging lock assembly (310) is arranged in matching with the second hanging lock assembly (320), and the first hanging lock assembly (310) is used for connecting with the second hanging lock assembly (320) of other frame structure (350) to realize the splicing and locking of the upper and lower adjacent folding back frames (300); The first locking assembly (330) is arranged in matching with the second locking assembly (340), and the first locking assembly (330) is used for connecting with the second locking assembly (340) of other folding back frame (300) to realize the splicing and locking of the left and right adjacent folding back frames (300); The first locking assembly (330) is an arc lock assembly, which comprises an arc lock seat (331) and an arc lock seat fixing screw (332), the arc lock seat (331) is fixed on the frame structure (350) through the arc lock seat fixing screw (332), the arc lock seat (331) is used for installing an arc lock, and the arc lock seat (331) is used for connecting with the second locking assembly (340) of other folding back frame (300); and / or the second locking assembly (340) is a zipper lock assembly, which comprises a zipper lock (341) and a zipper lock fixing screw (342), the zipper lock (341) is fixed on the frame structure (350) through the zipper lock fixing screw (342), and the zipper lock (341) is used for connecting with the first locking assembly (330) of other folding back frame (300).

6. The folding backrest (300) according to any one of claims 1 to 5, characterized in that The second rod end (438) of the movable connecting rod assembly (430) has two rotation dimensions relative to the display screen (200).

7. The foldable backrest (300) according to claim 6, characterized in that The folding support rod assembly (360) further comprises a joint (370); The second rod end (438) of the movable connecting rod assembly (430) is rotationally connected with the joint (370), and the joint (370) is rotationally connected with the display screen (200) to make the second rod end (438) have two rotation dimensions relative to the display screen (200), including a first rotation dimension (363) of the joint (370) relative to the display screen (200) and a second rotation dimension (364) of the second rod end (438) relative to the joint (370).

8. A display device (100), characterized by The folding back frame (300) comprises a display screen (200) and the folding back frame (300) according to any one of claims 1 to 7; The fixed connecting rod assembly (420) and the movable connecting rod assembly (430) of the folding support rod assembly (360) of the folding back frame (300) are rotationally connected with the back frame (220) of the display screen (200).

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