LED display module and LED display device with same

Abstract

The utility model provides a light-emitting diode (LED) display module and an LED display device with the LED display module, and the LED display module comprises a flexible lamp panel, a light-emitting diode (LED) module and a light-emitting diode (LED) module, the rear covers are arranged on the rear side of the flexible lamp panel at intervals in the length direction of the flexible lamp panel; the flexible connecting frame comprises an outer frame and a plurality of connecting strips, one connecting strip is arranged between every two adjacent rear covers, the outer frame is arranged on the peripheries of the rear covers and the connecting strips in a surrounding mode, and the flexible connecting frame and the rear covers are of an integrated structure. According to the technical scheme, the problem that in the prior art, the display effect of an arc-shaped display screen is not ideal can be effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of LED display technology, and more specifically, to an LED display module and an LED display device having the same. Background Technology

[0002] Among related technologies, LED display technology has advantages such as high brightness, low power consumption, long lifespan, and high contrast, and is increasingly widely used in various scenarios in life.

[0003] The demand for curved LED displays is also increasing. Existing curved LED displays mainly achieve their shape by adjusting the angle between multiple flat LED display cabinets that are spliced ​​together using an angle adjustment structure. However, this method of achieving a curved display uses only one LED display cabinet as the adjustment unit, resulting in an overall display effect that is not ideal. Utility Model Content

[0004] The main objective of this invention is to provide an LED display module and an LED display device having the same, so as to solve the problem of unsatisfactory display effect of curved display screens in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, an LED display module is provided, comprising: a flexible light panel; a plurality of back covers, which are spaced apart along the length direction of the flexible light panel on the rear side of the flexible light panel; and a flexible connecting frame, comprising an outer frame and a plurality of connecting strips, wherein a connecting strip is provided between each pair of adjacent back covers, and the outer frame surrounds the outer periphery of the plurality of back covers and the plurality of connecting strips, wherein the flexible connecting frame and the plurality of back covers are an integral structure.

[0006] Furthermore, the outer wall of the back cover is provided with multiple mating grooves, and the flexible connecting frame is provided with multiple mating protrusions, which are inserted into the multiple mating grooves one by one; and / or, the outer wall of the back cover is provided with a first connecting protrusion, the first connecting protrusion is provided with multiple connecting through holes, the connecting through holes penetrate the first connecting protrusion in the front-back direction, and the flexible connecting frame is provided with multiple insertion parts corresponding to the multiple connecting through holes one by one.

[0007] Furthermore, the flexible connecting frame and multiple back covers are formed by injection molding; and / or, a second connecting flange is provided on the side wall of the back cover facing the connecting strip, the second connecting flange including a first plate extending in a direction away from the back cover and a second plate provided at the end of the first plate and extending in a front-rear direction, and a connecting groove is provided on the connecting strip to accommodate the second connecting flange.

[0008] Furthermore, a deformation groove is provided on the front and / or rear surface of the connecting strip, and the deformation groove extends along the length direction of the connecting strip.

[0009] Furthermore, the front side of the rear cover has a first perimeter, the flatness of the front surface of the first perimeter is less than or equal to 0.05 mm, and / or the surface roughness of the front surface of the first perimeter is less than or equal to 20 μm.

[0010] Furthermore, the flexible connecting frame also includes a second perimeter set on the front side of the outer frame, with the flexible light panel located inside the second perimeter and the second perimeter protruding forward from the flexible light panel.

[0011] Furthermore, multiple raised ribs are provided on the inner surface of the second perimeter, and multiple recesses are correspondingly provided on the flexible lamp panel.

[0012] Furthermore, the flexible light panel has multiple IC chips disposed on its rear side, wherein each IC chip extends along the length of the rear cover; and / or, the LED display module also includes a sealant layer disposed on the rear side of the flexible light panel, the sealant layer covering the multiple IC chips.

[0013] Furthermore, the LED display module also includes a limiting arm, which is connected between two adjacent rear covers. One end of the limiting arm is fixedly connected to one of the rear covers, and the other end of the limiting arm is provided with a limiting block. The other rear cover is provided with a limiting groove, and the limiting block is movably disposed in the limiting groove. The limiting block can cooperate with the side wall stop of the limiting groove to limit the flip angle between the two adjacent rear covers.

[0014] According to another aspect of the present invention, an LED display device is provided, comprising a plurality of LED display modules, wherein the LED display modules are the aforementioned LED display modules.

[0015] The present invention provides an LED display module comprising multiple back covers and flexible connecting frames. These back covers and frames are integrated and supported on the rear side of a flexible light panel. Connecting strips, which are flexible and deformable, are provided between adjacent back covers, allowing for bending. Since the flexible light panel is also flexible, it deforms when adjacent back covers bend, thus enabling the entire LED display module to deform for use as a curved display screen. This structural design transforms the adjustment unit of the curved display screen into a single back cover, which is significantly smaller than the individual LED display cabinets used as adjustment units in related technologies. This results in a smoother curved display surface and a better display effect. Therefore, the present invention effectively solves the problem of unsatisfactory display effects in curved displays in related technologies. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A perspective structural schematic diagram of an embodiment of the LED display module according to the present invention is shown;

[0018] Figure 2 It shows Figure 1 An enlarged view of point A of the LED display module;

[0019] Figure 3 It shows Figure 1 Rear view of the LED display module;

[0020] Figure 4 It shows Figure 3 A magnified view of point B on the LED display module;

[0021] Figure 5 It shows Figure 1 A cross-sectional schematic diagram of a portion of the structure of an LED display module;

[0022] Figure 6 It shows Figure 1 A three-dimensional structural diagram of the flexible connecting frame of the LED display module;

[0023] Figure 7 It shows Figure 6 Enlarged view of point C of the flexible connecting frame;

[0024] Figure 8 It shows Figure 1 A three-dimensional structural diagram of a portion of the flexible lamp panel of an LED display module;

[0025] Figure 9 It shows Figure 1 Rear view of a portion of the structure of the first rear cover of the LED display module;

[0026] Figure 10 It shows Figure 9 A three-dimensional structural diagram of a portion of the first back cover;

[0027] Figure 11 It shows Figure 1 A three-dimensional structural diagram of a portion of the second rear cover of the LED display module;

[0028] Figure 12 A perspective structural schematic diagram of an embodiment of the LED display device according to the present invention is shown;

[0029] Figure 13 It shows Figure 12 A three-dimensional schematic diagram of an LED display device that bends forward;

[0030] Figure 14 It shows Figure 13 A rear view of the LED display device;

[0031] Figure 15 It shows Figure 12 A three-dimensional structural diagram of an LED display device that bends backward;

[0032] Figure 16 It shows Figure 15 A rear view of the LED display device.

[0033] The above figures include the following reference numerals:

[0034] 10. Flexible light panel; 11. Notch;

[0035] 20. Back cover; 21. Butt groove; 22. First connecting flange; 221. Connecting through hole; 23. Second connecting flange; 231. First plate; 232. Second plate; 24. First rim; 25. Limiting groove;

[0036] 30. Flexible connecting frame; 31. Outer frame; 32. Connecting strip; 321. Connecting groove; 322. Deformation groove; 33. Butt joint protrusion; 34. Insertion part; 35. Second perimeter; 36. Raised rib;

[0037] 40. Limit arm; 41. Limit block;

[0038] 50. Support frame;

[0039] 60. Power supply box;

[0040] 70. Telescopic boom. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0042] like Figures 1 to 4As shown, this application provides an LED display module. An embodiment of the LED display module of this application includes: a flexible light panel 10, multiple back covers 20, and a flexible connecting frame 30. The multiple back covers 20 are spaced apart along the length of the flexible light panel 10 on its rear side. The flexible connecting frame 30 includes an outer frame 31 and multiple connecting strips 32. A connecting strip 32 is provided between every two adjacent back covers 20. The outer frame 31 surrounds the outer periphery of the multiple back covers 20 and the multiple connecting strips 32. The flexible connecting frame 30 and the multiple back covers 20 are an integral structure.

[0043] Applying the technical solution of this embodiment, the LED display module includes multiple back covers 20 and flexible connecting frames 30. The multiple back covers 20 and flexible connecting frames 30 are an integral structure and supported on the rear side of the flexible lamp panel 10. Since connecting strips 32 are provided between adjacent back covers 20, and the connecting strips 32 are flexible structures that can deform, the adjacent back covers 20 can be bent. Since the flexible lamp panel 10 is also a flexible structure, when the adjacent back covers 20 bend, the flexible lamp panel 10 will deform accordingly, thereby allowing the entire LED display module to deform to be used as a curved display screen. The above-mentioned structural arrangement makes the adjustment unit of the curved display screen a single back cover 20, which is much smaller than the single LED display cabinet used as the adjustment unit in related technologies, resulting in a smoother curved display surface and a better display effect. Therefore, the technical solution of this embodiment can effectively solve the problem of unsatisfactory display effects of curved displays in related technologies.

[0044] like Figure 3 as well as Figures 9 to 11 As shown, the multiple back covers 20 include two first back covers and multiple second back covers located between the two first back covers. The two first back covers have the same structure, and each of the two first back covers is provided with a clearance hole for the conductive plug-in on the flexible lamp panel 10 to pass through rearward. The multiple second back covers have the same structure.

[0045] Specifically, in this embodiment, by thinning the PCB board to form a flexible light board 10 that can bend along with the back cover 20, since the PCB board itself has a certain strength, when the adjacent back covers 20 bend, no creases corresponding to the connecting strip 32 will appear on the flexible light board 10, further improving the display effect.

[0046] like Figure 1 and Figure 3 As shown, the flexible light panel 10 has a rectangular or square structure, wherein... Figure 3 The horizontal direction in the middle is the length direction of the flexible light panel 10. Figure 3The vertical direction is the width direction of the flexible light panel 10. When the flexible light panel is square, the extension direction of one of its sides is the length direction, and the extension direction of the side adjacent to that side is the width direction.

[0047] like Figure 4 , Figure 6 , Figure 7 as well as Figures 9 to 11 As shown, the outer wall of the back cover 20 is provided with multiple mating grooves 21, and the flexible connecting frame 30 is provided with multiple mating protrusions 33, which are inserted one-to-one into the multiple mating grooves 21. The above arrangement allows the connection between the flexible connecting frame 30 and the back cover 20 to fit together, ensuring the connection effect between the two.

[0048] Specifically, such as Figure 4 As shown, the width of the mating groove 21 gradually decreases in the direction away from the center of the back cover 20, that is, the width of the groove opening of the mating groove 21 is smaller, which further avoids the separation of the flexible connecting frame 30 and the back cover 20 in the length and width directions of the LED display module.

[0049] like Figure 6 , Figure 7 and Figure 10 As shown, a first connecting flange 22 is provided on the outer side wall of the back cover 20. Multiple connecting holes 221 are provided on the first connecting flange 22, extending through it in the front-to-back direction. Multiple insertion portions 34 are provided on the flexible connecting frame 30, each corresponding to one of the multiple connecting holes 221. The insertion portions 34 are inserted into the corresponding connecting holes 221, preventing the flexible connecting frame 30 and the back cover 20 from separating in the length and width directions of the LED display module. Furthermore, both ends of the insertion portions 34 have connecting sections for connecting to the side walls of the outer frame 31 and the connecting strip 32. These connecting sections provide front-to-back stops with the back cover 20, preventing the flexible connecting frame 30 and the back cover 20 from separating in the thickness direction (i.e., the front-to-back direction) of the LED display module.

[0050] like Figure 5 , Figure 7 , Figure 9 and Figure 11 As shown, a second connecting flange 23 is provided on the side wall of the rear cover 20 facing the connecting strip 32. The second connecting flange 23 includes a first plate 231 extending away from the rear cover 20 and a second plate 232 provided at the end of the first plate 231 and extending in the front-rear direction. A connecting groove 321 is provided on the connecting strip 32 to accommodate the second connecting flange 23. Figure 5As shown, the cross-section of the second connecting flange 23 forms a "T" shape, and the shape of the connecting groove 321 is adapted to the shape of the second connecting flange 23. The second plate 232 will stop with the groove wall of the connecting groove 321, restricting the back cover 20 and the connecting strip 32 from separating in the length direction of the LED display module.

[0051] like Figure 5 As shown, deformation grooves 322 are provided on the front and rear surfaces of the connecting strip 32, extending along the length of the connecting strip 32. The deformation grooves 322 make the middle part of the connecting strip 32 thinner, making it easier to deform, and thus making it easier to bend between two adjacent back covers 20. In this embodiment, deformation grooves 322 are provided on both the front and rear surfaces of the connecting strip 32. In embodiments not shown in the figure, deformation grooves may be provided only on the front or rear surface of the connecting strip.

[0052] Preferably, the connection between the deformable groove 322 and the front and rear surfaces of the connecting strip 32 adopts an arc transition, thereby avoiding stress concentration that could affect the service life of the connecting strip 32.

[0053] The flexible connecting frame 30 and multiple back covers 20 are molded using injection molding. Specifically, the back covers 20 are made of materials that form a rigid structure after molding, such as PS (polystyrene), ABS (acrylonitrile-butadiene-polystyrene copolymer), AS (acrylonitrile-styrene copolymer), and rigid PVC (polyvinyl chloride) (hereinafter referred to as rigid plastic materials). The flexible connecting frame is made of materials that form a flexible structure after molding, such as silicone, soft rubber, TPE (thermoplastic elastomer), and TPU (thermoplastic polyurethane) (hereinafter referred to as soft plastic materials). In the manufacturing process, the back covers 20 are first made using a mold, then the molded back covers 20 are placed into another mold and soft plastic material is injected into the mold, ultimately forming an integrated structure consisting of the flexible connecting frame 30 and multiple back covers 20.

[0054] like Figure 5 and Figure 11 As shown, the front side of the back cover 20 has a first perimeter 24. The flatness of the front surface of the first perimeter 24 is less than or equal to 0.05 mm, and the surface roughness of the front surface of the first perimeter 24 is less than or equal to 20 μm. After the back cover 20 is molded, when the soft rubber material and the back cover 20 are injection molded together, the first perimeter 24 abuts against the mold and can prevent the soft rubber material from flowing into the interior of the back cover 20. This allows the precision of the part of the mold used to perform the co-injection of the soft rubber material and the back cover 20 corresponding to the interior of the back cover 20 to be set lower, reducing the cost of the mold. Preferably, the flatness of the front surface of the first perimeter 24 can be 0.05 mm, 0.04 mm, or 0.02 mm; the surface roughness of the front surface of the first perimeter 24 can be 20 μm, 15 μm, 10 μm, or 5 μm.

[0055] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the flexible connecting frame 30 also includes a second perimeter 35 disposed on the front side of the outer frame 31. The flexible light panel 10 is located inside the second perimeter 35, and the second perimeter 35 protrudes forward from the flexible light panel 10. The second perimeter 35 protrudes forward from the flexible light panel 10 and surrounds the outer periphery of the flexible light panel 10. When the front side of the flexible light panel 10 is sealed with adhesive to make the LED display module waterproof, the second perimeter 35 can prevent adhesive from overflowing.

[0056] like Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, multiple raised ribs 36 are provided on the inner surface of the second perimeter 35, and multiple recesses 11 are correspondingly provided on the flexible light panel 10. Because the second perimeter 35 is relatively thin, the flow channel for the soft rubber material is very narrow during injection molding, making it difficult to flow to the corresponding position in the mold, resulting in empty space and damage to the second perimeter 35. By providing raised ribs 36 on the inner surface of the second perimeter 35, the flow channel for the soft rubber material is enlarged, allowing the soft rubber material to flow and fill the position on the mold corresponding to the second perimeter 35; furthermore, the raised ribs 36 also increase the strength of the second perimeter 35.

[0057] In this embodiment, a plurality of IC chips are disposed on the rear side of the flexible light panel 10, wherein each IC chip extends along the length direction of the rear cover 20. The bending direction of the LED display module is the arrangement direction of the rear cover 20, that is, the width direction of the rear cover 20. By extending each IC chip along the length direction of the rear cover, the size of the IC chip in the width direction of the rear cover 20 is relatively small, so as to avoid affecting the bending of the flexible light panel 10 along with the rear cover 20. At the same time, it also avoids the tension on the connection pins of the IC chip and the flexible light panel 10 being too large, which would affect the conduction of the circuit on the IC chip and the flexible light panel 10.

[0058] In this embodiment, the LED display module also includes a sealant layer disposed on the rear side of the flexible light panel 10, which covers multiple IC chips. By providing a sealant layer on the rear side of the flexible light panel 10, the LED display module can be applied to outdoor scenarios.

[0059] like Figure 3 and Figure 4As shown, the LED display module also includes a limiting arm 40, which is connected between two adjacent rear covers 20. One end of the limiting arm 40 is fixedly connected to one of the rear covers 20, and the other end of the limiting arm 40 is provided with a limiting block 41. A limiting groove 25 is provided on the other rear cover 20. The limiting block 41 is movably disposed within the limiting groove 25, and the limiting block 41 can cooperate with the side wall stop of the limiting groove 25 to limit the rotation angle between the two adjacent rear covers 20. The width of the limiting groove 25 (i.e., the width of the limiting groove 25 within...) Figure 4 The lateral dimension is greater than the width of the limiting block 41, so that the limiting block 41 can move along the limiting groove 25. Figure 4 The lateral movement of the limit block 41 changes its position within the limit groove 25 when a bend occurs between adjacent back covers 20. Figure 4 When the left side surface of the middle is stopped, it indicates that the two adjacent rear covers 20 have reached the limit position of the back fold. When the limiting block 41 and the limiting groove 25 are in Figure 4 When the right side surface of the cover stops, it indicates that the two adjacent back covers 20 have reached the limit position of the forward fold.

[0060] like Figures 12 to 16 As shown, this application also provides an LED display device. Embodiments of the LED display device of this application include multiple LED display modules, wherein the LED display modules are the aforementioned LED display modules. The aforementioned LED display modules can effectively solve the problem of unsatisfactory display effects of curved displays in related technologies, and LED display devices having the aforementioned LED display modules also possess the aforementioned advantages.

[0061] like Figure 12 As shown, the LED display device in this embodiment is an LED display cabinet, which includes a support frame 50 and multiple LED display modules disposed on the front side of the support frame 50. An LED display cabinet can be used as an LED display screen, and multiple LED display cabinets can also be spliced ​​together to form a larger LED display screen.

[0062] like Figures 13 to 16 As shown, the LED display device also includes a power supply box 60, two support frames 50 located on both sides of the power supply box 60, and telescopic arms 70 connecting the power supply box 60 and the support frames 50. The power supply box 60 is located in the middle of the LED display cabinet, and two telescopic arms 70 are connected between each support frame 50 and the power supply box 60. The telescopic arms 70 can extend and retract, thereby changing the distance between the power supply box 60 and the support frames 50.

[0063] Specifically, the LED display cabinet can be bent backward or forward to have a curved display surface. Figure 12A schematic diagram of a planar LED display cabinet is shown. When the display surface of the LED display cabinet needs to be bent forward, the telescopic arm 70 extends, causing the rear covers 20 on both sides of the LED display cabinet to move forward relative to the rear cover 20 located in the middle of the LED display cabinet, thus positioning the LED display cabinet in a flat position. Figure 13 and Figure 14 As shown in the diagram; when it is necessary to bend the display surface of the LED display cabinet backward, the telescopic arm 70 is shortened, causing the rear covers 20 located on both sides of the LED display cabinet to move backward relative to the rear cover 20 located in the middle of the LED display cabinet, so that the LED display cabinet is in the position shown. Figure 15 and Figure 16 The state shown.

[0064] The telescopic arm 70 can be a continuously adjustable telescopic component or a stepped adjustable telescopic component; this application does not limit this.

[0065] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0066] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0067] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An LED display module, characterized in that, include: Flexible light panel (10); Multiple back covers (20) are spaced apart along the length of the flexible lamp panel (10) on the rear side of the flexible lamp panel (10); The flexible connecting frame (30) includes an outer frame (31) and a plurality of connecting strips (32). A connecting strip (32) is provided between each pair of adjacent back covers (20). The outer frame (31) surrounds the outer periphery of the plurality of back covers (20) and the plurality of connecting strips (32). The flexible connecting frame (30) and the plurality of back covers (20) are an integral structure.

2. The LED display module according to claim 1, characterized in that, The outer wall of the rear cover (20) is provided with a plurality of mating grooves (21), and the flexible connecting frame (30) is provided with a plurality of mating protrusions (33), the plurality of mating protrusions (33) being inserted one-to-one into the plurality of mating grooves (21); and / or, The outer side wall of the rear cover (20) is provided with a first connecting protrusion (22), and a plurality of connecting through holes (221) are provided on the first connecting protrusion (22). The connecting through holes (221) penetrate the first connecting protrusion (22) in the front-back direction. The flexible connecting frame (30) is provided with a plurality of plug-in parts (34) corresponding one-to-one with the plurality of connecting through holes (221).

3. The LED display module according to claim 1, characterized in that, The flexible connecting frame (30) and the plurality of rear covers (20) are formed by injection molding; and / or, The rear cover (20) has a second connecting flange (23) on its side wall facing the connecting strip (32). The second connecting flange (23) includes a first plate (231) extending away from the rear cover (20) and a second plate (232) disposed at the end of the first plate (231) and extending in the front-rear direction. The connecting strip (32) has a connecting groove (321) for accommodating the second connecting flange (23).

4. The LED display module according to any one of claims 1 to 3, characterized in that, The front and / or rear surfaces of the connecting strip (32) are provided with deformation grooves (322), which extend along the length direction of the connecting strip (32).

5. The LED display module according to any one of claims 1 to 3, characterized in that, The front side of the rear cover (20) has a first rim (24), the flatness of the front surface of the first rim (24) is less than or equal to 0.05 mm, and / or the surface roughness of the front surface of the first rim (24) is less than or equal to 20 μm.

6. The LED display module according to any one of claims 1 to 3, characterized in that, The flexible connecting frame (30) also includes a second perimeter (35) disposed on the front side of the outer frame (31), the flexible light panel (10) is located inside the second perimeter (35), and the second perimeter (35) protrudes forward from the flexible light panel (10).

7. The LED display module according to claim 6, characterized in that, The inner surface of the second perimeter (35) is provided with a plurality of raised ribs (36), and the flexible lamp plate (10) is provided with a plurality of recesses (11).

8. The LED display module according to any one of claims 1 to 3, characterized in that, The flexible lamp panel (10) has multiple IC chips on its rear side, among which, Each of the IC chips extends along the length of the rear cover (20); and / or, The LED display module also includes a sealant layer disposed on the rear side of the flexible lamp plate (10), the sealant layer covering multiple IC chips.

9. The LED display module according to any one of claims 1 to 3, characterized in that, The LED display module also includes a limiting arm (40), which is connected between two adjacent rear covers (20). One end of the limiting arm (40) is fixedly connected to one of the rear covers (20), and the other end of the limiting arm (40) is provided with a limiting block (41). The other rear cover (20) is provided with a limiting groove (25). The limiting block (41) is movably disposed in the limiting groove (25). The limiting block (41) can cooperate with the side wall stop of the limiting groove (25) to limit the flip angle between the two adjacent rear covers (20).

10. An LED display device comprising a plurality of LED display modules, characterized in that, The LED display module is the LED display module according to any one of claims 1 to 9.

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