Screwless LED display screen module

Abstract

The utility model discloses a kind of LED display screen module without screw connection, comprising: PCB board, it is equipped with functional element;Plastic steel bottom shell, it is fixedly connected with the PCB board by adhesive layer;Wherein, the adhesive layer and the plastic steel bottom shell are respectively provided with first relief structure and second relief structure in the position corresponding to the functional element, the first relief structure and second relief structure jointly constitute the relief space for accommodating the functional element.Solve the problem that traditional LED display screen module uses screw assembly to cause tin short circuit, line damage and uneven lamp surface.

Description

Technical Field

[0001] This utility model relates to the field of LED display technology, and in particular to an LED display module with screwless connection. Background Technology

[0002] Traditional LED display modules mainly consist of PCBs, LED chips, ICs, plastic base shells, screws, and other key components. The manufacturing process involves first surface-mounting the LED chips, ICs, and other electronic components onto the PCB using surface mount technology (SMT), and then securing the PCB to the plastic base shell with screws to form an LED display module. To save costs, manufacturers typically use a single plastic base shell mold to accommodate PCBs with multiple pitches. However, due to equipment precision and manufacturing errors, this approach has the following drawbacks:

[0003] (1)Reference Figure 1 The LEDs on the PCB display side are soldered onto the pads on the PCB LED side using a pick-and-place machine. In this way, some solder will leak along the screw holes onto the LED side, connecting the pads of two adjacent LEDs, which can easily cause a short circuit, resulting in defects and wasted costs.

[0004] (2) To save on mold costs and facilitate base shell material preparation, traditional LED display module base shells typically accommodate multiple LED panels with different spacings. To ensure a tight fixation between the LED panel and the base shell, free from unevenness or cracking, the screw positions must be evenly distributed, and the holes with different spacings are usually close together. When assembling the LED panel with the plastic base shell, it is done using a screw-operated machine. During operation, the screw head has a rotation radius, as shown in the reference... Figure 2 If a screw is drilled into screw hole 1, it may hit screw hole 2 instead. This could damage the circuitry on the PCB board, causing defects or even rendering it unusable.

[0005] (3) During the PCB manufacturing process, batch drilling is performed. Due to the hardness of the PCB material, the drill bit will wear down, resulting in a certain error in the hole diameter between the previous and subsequent batches. This leads to some screws not being tightened properly when assembling the LED light board and the LED base. After prolonged use, the screws will break off, and the loose screws will protrude from the surrounding area, forming bumps or waves, affecting the appearance. To solve the problem of local protrusions and unevenness, the manufacturer will replace them with more suitable screws, which generates a lot of rework time and wastes production costs. Utility Model Content

[0006] To address the shortcomings of the existing technology, this utility model provides a screwless LED display module, which solves the problems of short circuits, circuit damage, and uneven lamp surfaces caused by screw assembly in traditional LED display modules.

[0007] This utility model is achieved using the following technical solution:

[0008] A screwless LED display module includes:

[0009] PCB board, which contains functional components;

[0010] The plastic-steel base shell is fixedly connected to the PCB board via an adhesive layer;

[0011] The adhesive layer and the plastic steel base shell are respectively provided with a first clearance structure and a second clearance structure at the positions corresponding to the functional elements. The first clearance structure and the second clearance structure together constitute a clearance space for accommodating the functional elements.

[0012] Furthermore, the adhesive layer is double-sided tape.

[0013] Furthermore, the first clearance structure is a through hole formed on the adhesive layer.

[0014] Furthermore, the second clearance structure is a groove or through hole formed on the plastic steel bottom shell.

[0015] Furthermore, the projection of the clearance space in the direction perpendicular to the adhesive layer completely covers the functional element.

[0016] Furthermore, it also includes a plastic back cover, which has a third clearance structure at the position corresponding to the functional element, and the plastic back cover and the plastic steel bottom shell are detachably connected by a snap-fit ​​structure.

[0017] Furthermore, the snap-fit ​​structure includes a first snap-fit ​​portion and a second snap-fit ​​portion disposed on the plastic back cover, and a first latched portion and a second latched portion disposed on the plastic steel bottom shell and respectively engaging with the first snap-fit ​​portion and the second snap-fit ​​portion.

[0018] Furthermore, the first snap-fit ​​part is an elastic buckle, the first snap-fit ​​part is a slot or hole into which the elastic buckle is snapped, the second snap-fit ​​part is a boss, and the second snap-fit ​​part is a groove that engages with the boss.

[0019] Furthermore, the elastic buckle is located on the top of the plastic back cover, and the boss is located on the bottom of the plastic back cover. The elastic buckle includes a cantilever beam integrally formed with the plastic back cover and a buckle portion located at the free end of the cantilever beam. The buckle portion is used to snap into the buckle groove or buckle position. The boss is a T-shaped protrusion or a dovetail-shaped protrusion formed on the plastic steel bottom shell.

[0020] Furthermore, the plastic back cover has multiple mating slots on its mating edge, and the plastic steel bottom shell has corresponding mating protrusions on its mating edge that mate with the mating slots. During assembly, the mating slots of the plastic back cover are aligned with and pressed into the mating protrusions of the plastic steel bottom shell, so that the two are locked together.

[0021] Compared with the prior art, the beneficial effects of this utility model include at least the following:

[0022] This invention achieves a fixed connection between the PCB board and the plastic steel base shell through an adhesive layer, eliminating the need for screw drilling and tightening. This solves the problem of unevenness and wavy surfaces caused by drilling errors and screw mismatches on the PCB board. The uniform adhesion of the adhesive layer replaces screw tightening, preventing unevenness of the lamp surface caused by dense screw holes or uneven tightening force. The avoidance structure design protects functional components from compression during bonding, ensuring the flatness of the area around the functional components and preventing short circuits caused by solder leakage during surface mounting. Therefore, this invention utilizes the adhesive layer to provide a damage-free connection foundation, and the avoidance structure precisely protects the functional components. The combination of these two ensures that there is no mechanical stress interference during the assembly of the LED display module, effectively solving the problems of short circuits, circuit damage, and uneven lamp surfaces caused by reliance on screws in traditional technologies. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a PCB board using existing technology;

[0024] Figure 2 This is a schematic diagram of the existing technology's base shell;

[0025] Figure 3 This is one of the exploded views of the screwless LED display module according to an embodiment of this utility model;

[0026] Figure 4 This is the second exploded view of the screwless LED display module according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of a PCB board according to an embodiment of the present utility model;

[0028] Figure 6 This is an assembly diagram of the plastic steel bottom shell and the plastic back cover according to an embodiment of the present utility model;

[0029] Figure 7 yes Figure 6 Exploded view of the structure;

[0030] In the diagram: 1. PCB board; 11. Functional component; 2. Plastic steel base shell; 21. Second clearance structure; 22. Butt joint protrusion; 23. First locking part; 24. Second locking part; 3. Adhesive layer; 31. First clearance structure; 4. Plastic back cover; 40. Third clearance structure; 41. Butt joint; 42. First snap-fit ​​part; 421. Cantilever beam; 422. Buckle part; 43. Second snap-fit ​​part. Detailed Implementation

[0031] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0032] The terms used to describe position and direction in this utility model are illustrated with the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this utility model.

[0033] like Figures 3 to 7 As shown, the present invention provides a screwless LED display module, comprising:

[0034] PCB board 1, which is provided with functional components 11;

[0035] The plastic-steel base shell 2 is fixedly connected to the PCB board 1 through the adhesive layer 3;

[0036] The adhesive layer 3 and the plastic steel base shell 2 are respectively provided with a first clearance structure 31 and a second clearance structure 21 at the positions corresponding to the functional element 11. The first clearance structure 31 and the second clearance structure 21 together constitute a clearance space for accommodating the functional element 11.

[0037] In this embodiment, the PCB board 1 and the plastic steel base shell 2 are fixedly connected by the adhesive layer 3, eliminating the need for screw drilling and tightening operations on the PCB board 1 and the plastic steel base shell 2. This solves the problem of unevenness and wavy abnormalities caused by drilling errors and screw mismatches on the PCB board 1. The uniform adhesion of the adhesive layer 3 replaces screw tightening, preventing unevenness of the lamp surface caused by dense screw holes or uneven tightening force. At the same time, the design of the avoidance structure prevents the functional component 11 from being squeezed during the bonding process, ensuring the flatness of the area around the functional component 11 and avoiding short circuits caused by solder leakage during surface mounting. Therefore, this utility model uses the adhesive layer 3 to provide a damage-free connection foundation and the avoidance structure to precisely protect the functional component 11. The combination of the two ensures that there is no mechanical stress interference during the assembly process of the LED display module, effectively solving the problems of solder bridging, circuit damage, and uneven lamp surface caused by reliance on screws in traditional technologies.

[0038] In a preferred embodiment, the adhesive layer 3 is double-sided tape.

[0039] In this embodiment, double-sided tape is used as the adhesive layer 3. Its pre-formed structure avoids the risk of flow and diffusion of liquid adhesive during application, thereby preventing the functional component 11 from being covered by adhesive and short-circuiting. Moreover, the instant bonding characteristics of double-sided tape do not require waiting for curing, which significantly shortens the assembly time and improves the assembly efficiency. In addition, the uniform thickness and stable adhesion of double-sided tape ensure a tight fit between the PCB board 1 and the plastic steel base shell 2, avoiding the risk of module loosening caused by uneven bonding. Ultimately, a flat and consistent display surface is achieved, avoiding the appearance problems caused by connection defects in traditional solutions.

[0040] In a preferred embodiment, the first clearance structure 31 is a through hole formed on the adhesive layer 3.

[0041] In this embodiment, the through-hole forms a precise opening area on the adhesive layer 3, allowing the functional element 11 to directly pass through the through-hole and embed into the clearance space, avoiding direct contact between the adhesive material and the surface of the functional element 11. Specifically, the through-hole formed on the adhesive layer 3 ensures that the functional element 11 is not physically obstructed by the adhesive layer 3 material during the bonding operation, thereby effectively isolating the mechanical pressure and thermal stress exerted by the adhesive layer 3 on the functional element 11. At the same time, the boundary of the through-hole matches the contour of the functional element 11, preventing adhesive material from flowing into the area surrounding the functional element 11 and eliminating the risk of electrical short circuits caused by material coverage. This design not only ensures the stability and heat dissipation efficiency of the functional element 11 during module operation but also simplifies the assembly process and avoids rework and cost waste caused by inaccurate clearance structures.

[0042] In a preferred embodiment, the second clearance structure 21 is a groove or through hole formed on the plastic steel bottom shell 2.

[0043] In this embodiment, the second clearance structure 21 is defined as a groove or a through hole, which can flexibly adapt to different functional components 11. Specifically, the groove forms a concave receiving cavity on the plastic steel base shell 2, which can adapt to the three-dimensional contour of the functional component 11 and prevent the vertical pressure applied by the adhesive layer 3 from directly acting on the surface of the functional component 11. It is especially suitable for functional components 11 with higher height, such as driver ICs, to prevent the functional component 11 from cracking or the solder joints from falling off due to uneven pressure. The through hole is implemented by opening through the plastic steel base shell 2, allowing the functional component 11 to partially protrude from the plane of the plastic steel base shell 2, eliminating the constraint of the plastic steel base shell 2 on the functional component 11. It is particularly suitable for precision optical components such as LED beads, to avoid damage to light transmission performance. It can be understood that the groove provides local support to maintain the flatness of the module, while the through hole optimizes the space utilization and reduces the manufacturing complexity. This allows the clearance space to be completely covered in the vertical direction, so that the functional component 11 is completely in a pressure-free environment, thereby solving the problem of functional component 11 failure caused by defects in the fixing method in the prior art.

[0044] In a preferred embodiment, the projection of the clearance space in the direction perpendicular to the adhesive layer 3 completely covers the functional element 11.

[0045] In this embodiment, the clearance space is provided by the first clearance structure 31 of the adhesive layer 3 and the second clearance structure 21 of the plastic steel base shell 2. The projection perpendicular to the direction of the adhesive layer 3 completely covers the functional element 11, meaning that the functional element 11 is completely located within the clearance space in the thickness direction without any protrusion. This design ensures that the functional element 11 is not directly subjected to external pressure when the adhesive layer 3 and the plastic steel base shell 2 are fixedly connected, avoiding deformation or damage to the element due to compression. At the same time, the complete coverage prevents the functional element 11 from being exposed to the external environment, eliminating the risk of short circuits that may be caused by contact, thereby ensuring the stable operation and display quality of the LED display module.

[0046] As a preferred embodiment, it also includes a plastic back cover 4, which has a third clearance structure 40 at the position corresponding to the functional element 11, and the plastic back cover 4 and the plastic steel bottom shell 2 are detachably connected by a snap-fit ​​structure.

[0047] In this embodiment, by covering the back of the plastic steel base cover with the plastic back cover 4, the functional component 11 is prevented from being directly exposed to the external environment, reducing the risk of damage caused by accidental contact or contamination. A third clearance structure 40 is set according to the specific position of the functional component 11 to ensure that the clearance space is precisely matched with the layout of the functional component 11, preventing the plastic back cover 4 from pressing or interfering with the functional component 11 during installation, maintaining the integrity of the original clearance space, and thus ensuring the normal working state of the plastic back cover 4. In addition, the plastic back cover 4 and the plastic steel base cover 2 are detachably connected by a snap-fit ​​structure, which not only eliminates the need for screw fixing, but also realizes quick disassembly and assembly without tools, improving convenience and service life.

[0048] In a preferred embodiment, the snap-fit ​​structure includes a first snap-fit ​​portion 42 and a second snap-fit ​​portion 43 disposed on the plastic back cover 4, and a first snap-fit ​​portion 23 and a second snap-fit ​​portion 24 disposed on the plastic steel bottom shell 2 and respectively cooperating with the first snap-fit ​​portion 42 and the second snap-fit ​​portion 43.

[0049] In this embodiment, the design of a dual-clamping mechanism enhances the stability and reliability of the connection between the plastic back cover 4 and the plastic-steel base shell 2. Specifically, by setting two independent first clamping parts 42 and second clamping parts 43, a tight fit is ensured during assembly, effectively preventing loosening caused by stress concentration after long-term use of the module. For example, the first clamping part 23 and the first clamping part 42 form the main fixing point to provide initial locking force, while the second clamping part 24 and the second clamping part 43 serve as auxiliary fixing points to supplement the connection strength. This dual-fitting mechanism not only reduces the risk of misalignment during assembly and reduces the squeezing damage to the functional components 11, but also ensures through redundant design that even if one clamping point is affected by external force, the other clamping point can still maintain the overall connection stability, thereby avoiding unevenness on the module surface caused by connection failure.

[0050] In a preferred embodiment, the first snap-fit ​​portion 42 is an elastic buckle, the first snap-fit ​​portion 23 is a slot or hole into which the elastic buckle is snapped, the second snap-fit ​​portion 43 is a boss, and the second snap-fit ​​portion 24 is a groove that engages with the boss.

[0051] In this embodiment, the first snap-fit ​​part 42 adopts an elastic snap, and the first locked part 23 is a slot or hole. During assembly, the elastic snap relies on elastic deformation to connect and separate with the slot or hole, which enhances the pull-out resistance of the connection and prevents the plastic back cover 4 from loosening due to vibration during module operation. The second snap-fit ​​part 43 adopts a boss as a rigid positioning point, which forms a snap-fit ​​with the second locked part 24, restricting the lateral movement of the plastic back cover 4 in the plane, ensuring that the plastic back cover 4 is precisely aligned with the plastic steel base shell 2, and avoiding the problem of uneven module surface caused by loose connection. The combination of elastic snap and boss realizes quick assembly and reliable locking, which not only ensures the connection strength to maintain the consistency of module appearance, but also facilitates disassembly during maintenance, effectively avoiding the risk of loosening and solder bridging in traditional screw connections.

[0052] In a preferred embodiment, the elastic buckle is located on the top of the plastic back cover 4, and the boss is located on the bottom of the plastic back cover 4. The elastic buckle includes a cantilever beam 421 integrally formed with the plastic back cover 4 and a buckle portion 422 located at the free end of the cantilever beam 421. The buckle portion 422 is used to snap into the buckle groove or buckle position. The boss is a T-shaped protrusion or a dovetail-shaped protrusion formed on the plastic steel bottom shell 2.

[0053] In this embodiment, the elastic buckle is located at the top of the plastic back cover 4. This location allows the operator to apply force directly from above during assembly, facilitating alignment with the slot and reducing the risk of lateral displacement. This effectively prevents buckle deformation or damage due to improper positioning. The boss is located at the bottom of the plastic back cover 4, providing a bottom support reference point to ensure accurate initial positioning of the plastic back cover 4 in the vertical direction. The elastic buckle adopts a cantilever beam 421 structure integrally formed with the plastic back cover 4. During the snapping process, the cantilever beam 421 can undergo controllable bending deformation to ensure that the buckle part 422 can smoothly slide into the slot. After the buckle part 422 is in place, it relies on material rebound to provide continuous clamping force. As a key snapping point, the shape of the buckle part 422 precisely matches the slot or position, ensuring smooth snapping action and reliable locking, effectively preventing accidental disengagement under slight vibration. The boss adopts a T-shaped or dovetail-shaped boss design. This special contour forms a two-way mechanical barrier in the horizontal direction. By using the principle of complementary shapes, it suppresses the lateral displacement tendency of the plastic back cover 4, significantly enhances the anti-loosening ability, and solves the inherent defect of simple bosses being easy to slip off under dynamic load.

[0054] In a preferred embodiment, the plastic back cover 4 has multiple docking slots 41 on its docking edge, and the plastic steel bottom shell 2 has docking protrusions 22 that cooperate with the docking slots 41 on its docking edge. During assembly, the docking slots 41 of the plastic back cover 4 are aligned and pressed into the docking protrusions 22 of the plastic steel bottom shell 2, so that the two are locked together.

[0055] In this embodiment, the design of the mating slots 41 and the mating protrusions 22 enhances the reliability of the mating edges between the plastic back cover 4 and the plastic steel base shell 2, effectively eliminating the risk of edge loosening and ensuring overall flatness. Specifically, the multiple mating slots 41 provided on the mating edges of the plastic back cover 4 disperse the assembly pressure in the edge area, avoiding local stress concentration. The precise fit between the mating protrusions 22 and the mating slots 41 ensures accurate alignment and tight fit of the mating edges, avoiding edge gaps or loosening, thereby ensuring a smooth and consistent module surface and improving product appearance quality and structural durability.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A screwless LED display module, characterized in that, include: PCB board (1), which is provided with functional components (11); The plastic steel base shell (2) is fixedly connected to the PCB board (1) by an adhesive layer (3); The adhesive layer (3) and the plastic steel base shell (2) are respectively provided with a first clearance structure (31) and a second clearance structure (21) at the position corresponding to the functional element (11). The first clearance structure (31) and the second clearance structure (21) together constitute a clearance space for accommodating the functional element (11).

2. The screwless LED display module according to claim 1, characterized in that, The adhesive layer (3) is double-sided tape.

3. The screwless LED display module according to claim 1, characterized in that, The first clearance structure (31) is a through hole formed on the adhesive layer (3).

4. The screwless LED display module according to claim 1, characterized in that, The second clearance structure (21) is a groove or through hole formed on the plastic steel bottom shell (2).

5. The screwless LED display module according to claim 1, characterized in that, The projection of the clearance space in the direction perpendicular to the adhesive layer (3) completely covers the functional element (11).

6. The screwless LED display module according to claim 1, characterized in that, It also includes a plastic back cover (4), which has a third clearance structure (40) at the position corresponding to the functional element (11). The plastic back cover (4) and the plastic steel bottom shell (2) are detachably connected by a snap-fit ​​structure.

7. The screwless LED display module according to claim 6, characterized in that, The snap-fit ​​structure includes a first snap-fit ​​part (42) and a second snap-fit ​​part (43) provided on the plastic back cover (4), and a first snap-fit ​​part (23) and a second snap-fit ​​part (24) provided on the plastic steel bottom shell (2) and respectively cooperating with the first snap-fit ​​part (42) and the second snap-fit ​​part (43).

8. The screwless LED display module according to claim 7, characterized in that, The first snap-fit ​​part (42) is an elastic buckle, the first snap-fit ​​part (23) is a slot or hole into which the elastic buckle is snapped, the second snap-fit ​​part (43) is a boss, and the second snap-fit ​​part (24) is a groove that engages with the boss.

9. The screwless LED display module according to claim 8, characterized in that, The elastic buckle is located on the top of the plastic back cover (4), and the boss is located on the bottom of the plastic back cover (4). The elastic buckle includes a cantilever beam (421) integrally formed with the plastic back cover (4) and a buckle part (422) located at the free end of the cantilever beam (421). The buckle part (422) is used to snap into the slot or the locking position. The boss is a T-shaped protrusion or a dovetail protrusion formed on the plastic steel bottom shell (2).

10. The screwless LED display module according to claim 6 or 7, characterized in that, The plastic back cover (4) has multiple docking slots (41) on its docking edge, and the plastic steel bottom shell (2) has docking protrusions (22) that cooperate with the docking slots (41) on its docking edge. During assembly, the docking slots (41) of the plastic back cover (4) are aligned and pressed into the docking protrusions (22) of the plastic steel bottom shell (2) so that the two are locked together.

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