Backlight module and display device

Abstract

The utility model discloses a kind of backlight module and display device, it is related to display device technical field.The backlight module includes backplate, light guide plate, light source assembly and middle frame;Light guide plate includes light guide plate body and with light guide plate body integrally formed and located in the mounting structure of light side, and mounting cavity is formed between the inner side wall of mounting structure and light guide plate body, and mounting structure is connected with backplate.Light source assembly includes lamp plate and multiple light sources connected with lamp plate, lamp plate is fixed in the inner side wall of mounting structure, and light source is located in mounting cavity.Middle frame is located in the outer side of mounting structure and is connected with mounting structure.Lamp plate is firmly fixed in mounting cavity, no longer bear additional stress due to component relative displacement.Besides, limit the amplitude of lamp plate in vibration, greatly improve the reliability of light source connection, effectively prevent the light-on failure caused by light source falling.The backlight module solves the problem that light source assembly is damaged due to displacement from the root, improves the reliability of backlight module.

Description

Technical Field

[0001] This utility model relates to the field of display device technology, and in particular to a backlight module and display device. Background Technology

[0002] In recent years, due to the special nature of their application environment, in-vehicle display devices have faced extremely high requirements for product reliability and durability. In practical applications, especially after undergoing rigorous reliability tests (such as thermal shock and prolonged vibration), some display devices have experienced black screen failures.

[0003] Subsequent analysis revealed that the root cause lay primarily in the flawed fixing method of the flexible circuit board in the light source assembly. Specifically, traditional fixing methods failed to effectively limit the spatial displacement of the flexible circuit board under long-term vibration and thermal stress, leading to: firstly, friction and abrasion between the edges of the flexible circuit board and surrounding structures, ultimately causing short circuits; secondly, insecure fixing causing the LED beads soldered to the flexible circuit board to detach due to additional stress; and thirdly, the flexible circuit board extending from the back panel opening was cut due to interference with the edges.

[0004] Any of the above situations will lead to a circuit break or short circuit, causing the backlight module to fail to light up, seriously affecting the reliability of the vehicle display device and driving safety. Therefore, a new structural design is urgently needed to fundamentally solve the problems of damage to the flexible circuit board caused by displacement and the detachment of LED beads, thereby improving the overall reliability of the vehicle backlight module. Utility Model Content

[0005] The purpose of this invention is to provide a backlight module and a display device, wherein the light source component of the backlight module will not be damaged due to displacement, thereby improving the reliability of the backlight module and ensuring the display effect of the display device.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A backlight module, comprising:

[0008] Back panel;

[0009] A light guide plate includes a light guide plate body and a mounting structure integrally formed with the light guide plate body and located on the light incident side. The inner sidewall of the mounting structure forms a mounting cavity with the light guide plate body, and the mounting structure is connected to the back plate.

[0010] A light source assembly includes a lamp panel and multiple light sources connected to the lamp panel. The lamp panel is fixed to the inner wall of the mounting structure, and the light sources are located inside the mounting cavity.

[0011] The middle frame is located on the outside of the mounting structure and connected to the mounting structure.

[0012] As an optional solution for the backlight module, the mounting structure includes a mounting side plate and a connecting plate. The mounting side plate and the light guide plate body form the mounting cavity. The light source assembly is mounted on the inner side wall of the mounting side plate. The connecting plate connects the mounting side plate and the light guide plate body.

[0013] As an optional solution for the backlight module, the connecting plate includes a horizontal connecting plate and a vertical connecting plate. One end of the horizontal connecting plate is connected to the mounting side plate, and the other end is connected to the light guide plate body through the vertical connecting plate. The mounting side plate, the horizontal connecting plate, the vertical connecting plate, and the light guide plate body together form the mounting cavity.

[0014] As an optional embodiment of the backlight module, the backlight module further includes an optical film disposed on the light guide plate body, the optical film abutting against the side wall of the vertical connecting plate away from the mounting side plate.

[0015] As an alternative to the backlight module, the mid-frame includes a top plate that covers the horizontal connecting plate and at least a portion of the optical film.

[0016] As an optional solution for the backlight module, the bottom of the mounting side panel is fixed to the back panel by adhesive.

[0017] As an optional solution for the backlight module, the outer wall of the mounting side panel is fixed to the middle frame by adhesive.

[0018] As an optional embodiment of the backlight module, the backlight module further includes a reflector, which is disposed between the light guide plate body and the back plate.

[0019] As an optional solution for the backlight module, the reflector includes a reflective base plate and a reflective side plate. The reflective base plate is located between the light guide plate body and the back plate, and the reflective side plate is located between the light guide plate body and the middle frame.

[0020] The display device includes a backlight module as described in any of the above embodiments.

[0021] The beneficial effects of this utility model are:

[0022] The backlight module provided by this utility model includes a light guide plate body and a mounting structure integrally formed with the light guide plate and located on the light-incident side. An mounting cavity is formed between the inner wall of the mounting structure and the light guide plate body. The lamp plate of the light source assembly is fixed to the inner wall of the mounting structure, allowing multiple light sources to be located within the mounting cavity. By directly fixing the lamp plate to the inner wall of the mounting structure integrally formed with the light guide plate, the integration and unified fixing of the light source assembly and the light guide plate are achieved. This allows the light source assembly and the light guide plate to move synchronously when subjected to thermal expansion and contraction, eliminating shear stress and friction caused by material thermal mismatch and solving the problem of short circuits caused by friction and cuts on the lamp plate. The lamp plate is firmly fixed within the mounting cavity and no longer bears additional stress caused by relative displacement of components. Simultaneously, the mounting cavity itself constitutes a protective space, limiting the amplitude of the lamp plate during vibration and minimizing the mechanical stress transmitted to the connection between the lamp plate and the light source. This significantly improves the reliability of the light source connection and effectively prevents lighting failure due to the light source falling. During thermal expansion and contraction, the significant differences in deformation between the backplate, middle frame, and light guide plate create shear stress, leading to noise and friction. The mounting structure connects to both the backplate and middle frame, effectively constraining the free deformation between the light guide plate and these components, forcing them to deform synchronously. This not only protects the internal light source components but also completely eliminates noise caused by friction between parts. This backlight module fundamentally solves the problem of damage to the light source components due to displacement, improving the reliability of the backlight module.

[0023] The display device provided in this embodiment uses the aforementioned backlight module, which eliminates lamp board wear and short circuits caused by relative displacement at the source. By placing the light source assembly inside the mounting cavity, the risk of the light source falling off is greatly reduced, and the stability and reliability of the backlight module structure are enhanced, thereby ensuring the display effect of the display device. Attached Figure Description

[0024] Figure 1 This is a partial cross-sectional view of the display device provided in a specific embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the light guide plate provided in a specific embodiment of the present invention;

[0026] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 This is a partially enlarged view of the light source assembly and light guide plate after assembly according to a specific embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the reflector provided in a specific embodiment of this utility model;

[0029] Figure 6 This is a partially enlarged view of the assembly of the light guide plate and the reflector plate after the installation of the light source assembly, provided in a specific embodiment of this utility model.

[0030] Figure 7 This is a partial enlarged view of the light guide plate and reflector plate assembled with the back plate according to a specific embodiment of this utility model.

[0031] In the picture:

[0032] 100. Display module;

[0033] 1. Back panel;

[0034] 2. Light guide plate; 21. Light guide plate body; 22. Mounting structure; 221. Mounting side plate; 222. Connecting plate; 2221. Horizontal connecting plate; 2222. Vertical connecting plate; 223. Base adhesive; 224. Outer adhesive; 225. Inner adhesive; 23. Mounting cavity;

[0035] 3. Light source assembly; 31. Lamp panel; 311. Connecting terminal; 32. Light source;

[0036] 4. Middle frame; 41. Top plate;

[0037] 5. Optical films;

[0038] 6. Reflector; 61. Reflector base plate; 62. Reflector side plate. Detailed Implementation

[0039] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] Figure 1 This is a partial cross-sectional view of the display device provided in a specific embodiment of this utility model, such as... Figure 1As shown, this embodiment provides a display device, which includes a backlight module and a display module 100. The display module 100 includes a display panel, which is the part that ultimately displays the image. The backlight module provides a uniform and bright surface light source for the display module 100. The backlight module includes a back plate 1, a light source assembly 3, and a light guide plate 2. The back plate 1 mainly serves as a structural support, fixing and supporting all internal components. It is usually made of stamped metal, shields electromagnetic interference, and helps with heat dissipation. The light source assembly 3 includes a lamp board 31 and multiple light sources 32 connected to the lamp board 31. The light sources 32 are LED light sources. The lamp board 31 is a flexible circuit board with LED chips soldered on it, providing driving current and mechanical fixation. The light guide plate 2 is usually made of high-transparency optical-grade acrylic. Its function is to convert point light sources or line light sources into uniformly distributed surface light sources through dot design and total internal reflection principle, and emit them from its entire upper surface.

[0042] In existing backlight modules, the light source assembly is mounted on the side wall of the back panel. During reliability testing of the backlight module, the light guide plate is displaced under long-term vibration and thermal stress, causing the light source assembly to be damaged due to the displacement of the light guide plate, resulting in a black screen in the display module.

[0043] To address the aforementioned technical problems, this embodiment provides a backlight module applied to the aforementioned display device. The backlight module includes a backplate 1, a light guide plate 2, a light source assembly 3, and a mid-frame 4. The light guide plate 2 includes a light guide plate body 21 and a mounting structure 22 integrally formed with the light guide plate body 21 and located on the light-incident side. A mounting cavity 23 is formed between the inner wall of the mounting structure 22 and the light guide plate body 21, and the mounting structure 22 is connected to the backplate 1. The light source assembly 3 includes a lamp plate 31 and multiple light sources 32 connected to the lamp plate 31. The lamp plate 31 is fixed to the inner wall of the mounting structure 22, and the light sources 32 are located within the mounting cavity 23. The mid-frame 4 is located on the outer side of the mounting structure 22 and connected to it.

[0044] By directly fixing the lamp plate 31 to the inner wall of the mounting structure 22, which is integrally formed with the light guide plate 2, the integration and fixed fixation of the light source assembly 3 and the light guide plate 2 are achieved. This allows the light source assembly 3 and the light guide plate 2 to move synchronously when subjected to thermal expansion and contraction, eliminating shear stress and friction caused by material thermal mismatch and solving the problem of short circuits caused by friction and cuts on the lamp plate 31. The lamp plate 31 is firmly fixed in the mounting cavity 23 and no longer bears additional stress caused by the relative displacement of components. At the same time, the mounting cavity 23 itself constitutes a protective space, limiting the amplitude of the lamp plate 31 during vibration and minimizing the mechanical stress transmitted to the connection between the lamp plate 31 and the light source 32. This significantly improves the reliability of the connection of the light source 32 and effectively prevents lighting failure caused by the light source 32 falling off. During thermal expansion and contraction, significant differences in deformation between the backplate 1, middle frame 4, and light guide plate 2 generate shear stress, leading to abnormal noise and friction. The mounting structure 22, connected to both the backplate 1 and middle frame 4, effectively constrains the free deformation between the light guide plate 2 and the backplate 1 and middle frame 4, forcing them to deform synchronously. This not only protects the internal light source assembly 3 but also completely eliminates abnormal noise caused by friction between components. This backlight module fundamentally solves the problem of damage to the light source assembly 3 due to displacement, improving the reliability of the backlight module.

[0045] Furthermore, the integrated light guide plate body 21 and mounting structure 22 combine multiple functions for positioning and supporting the light source assembly 3 into one component, eliminating the need for additional positioning and fixing components. During assembly, the positioning of the light source 32 can be completed simply by accurately installing the lamp plate 31 into the mounting cavity 23 of the light guide plate 2. This avoids the cumbersome process of aligning the back plate 1, light guide plate 2, and lamp plate 31 separately in the prior art, reducing assembly difficulty, improving production efficiency and alignment accuracy, and thus reducing the potential risks caused by manufacturing deviations.

[0046] The mounting cavity 23 encloses the light source assembly 3, forming a stable protective frame. When this backlight module is applied to an automotive display device, the integrated structure of the light guide plate 2 provides better support and constraint in the face of the inherent long-term mechanical vibration and impact of the automotive environment, preventing abnormal noises or loosening between components and improving the mechanical stability and durability of the backlight module.

[0047] Figure 2 This is a schematic diagram of the structure of the light guide plate provided in a specific embodiment of this utility model. Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle. Figure 4 This is a partially enlarged view of the light source assembly and light guide plate after assembly according to a specific embodiment of this utility model, such as... Figures 1-4As shown, in one embodiment, the back plate 1 is configured as a flat plate, and a circuit board electrically connected to an external power source is provided on the flat plate. The connection end 311 of the lamp board 31 is bent in a direction parallel to the back plate 1, so that the connection end 311 is electrically connected to the circuit board on the flat plate. Thus, the external power source can stably supply power to the lamp board 31 through the circuit board.

[0048] The design of bending the connection end 311 of the lamp board 31 in a direction parallel to the back plate 1 makes full use of the space in the plane area of ​​the back plate 1 and ensures the reliability of the circuit board connection between the lamp board 31 and the back plate 1.

[0049] In one embodiment, the mounting structure 22 includes a mounting side plate 221 and a connecting plate 222. A mounting cavity 23 is formed between the mounting side plate 221 and the light guide plate body 21. The light source assembly 3 is mounted on the inner side wall of the mounting side plate 221. The connecting plate 222 is located between the mounting side plate 221 and the light guide plate body 21, and can connect the mounting side plate 221 and the light guide plate body 21. The connection plate 222 provides a space between the mounting side plate 221 and the light guide plate body 21 to accommodate the light source assembly 3. At the same time, the connecting plate 222 undertakes the function of force transmission and transition. When the light guide plate body 21 expands and contracts due to temperature changes, the connecting plate 222 forms a buffer zone at this point, which can more flexibly absorb and dissipate this stress, avoiding the stress directly acting on the light guide plate body 21 and causing it to warp or crack.

[0050] For example, the inner wall of the mounting side plate 221 is provided with inner adhesive 225, and the lamp plate 31 is bonded to the inner wall of the mounting side plate 221 by the inner adhesive 225. The inner adhesive 225 is a high-temperature double-sided adhesive or a thermally conductive tape, which can firmly fix the lamp plate 31 under vibration and high temperature and prevent its displacement.

[0051] The bottom of the mounting side panel 221 is provided with a base adhesive 223, which is used to bond and fix the bottom of the mounting side panel 221 to the back panel 1. The outer side wall of the mounting side panel 221 is provided with an outer adhesive 224, which is used to bond and fix the middle frame 4 to the mounting side panel 221. Both the base adhesive 223 and the outer adhesive 224 are foam tapes, which provide strong structural adhesion, support the overall weight of the backlight module, and resist vibration and impact.

[0052] The mounting side plate 221 provides a common, precise assembly reference for the back plate 1 and the middle frame 4, based on the light guide plate body 21. During installation, the light source assembly 3 is first bonded to the inner wall of the mounting side plate 221, and then the back plate 1 is aligned and fixed to the bottom of the mounting side plate 221. When installing the middle frame 4, the middle frame 4 is directly fixed to the outer adhesive 224 of the mounting side plate 221, which reduces the cumulative tolerance caused by multi-layer stacking and improves the production yield.

[0053] Of course, in other embodiments, a hook can be designed at the bottom of the mounting side plate 221 to pre-fix it with the slot on the back plate 1, and then sealed and reinforced with adhesive, which combines mechanical locking and stress buffering. A buckle is designed on the outer wall of the mounting side plate 221 to fasten with the corresponding structure on the inner side of the middle frame 4.

[0054] In one embodiment, the connecting plate 222 includes a horizontal connecting plate 2221 and a vertical connecting plate 2222. One end of the horizontal connecting plate 2221 is connected to the mounting side plate 221, and the other end is connected to the light guide plate body 21 through the vertical connecting plate 2222. The mounting side plate 221, the horizontal connecting plate 2221, the vertical connecting plate 2222, and the light guide plate body 21 together form a mounting cavity 23. The horizontal connecting plate 2221 forms the top of the mounting cavity 23, and the vertical connecting plate 2222, the light guide plate body 21, and the mounting side plate 221 form the sidewalls of the mounting cavity 23, enclosing the light source assembly 3 within a mounting cavity 23 that is closed at the top and on both opposite sides. This completely eliminates the possibility of the lamp plate 31 contacting, rubbing, or interfering with other components above or to the side, and solves the possibility of the lamp plate 31 being cut or abraded, leading to a short circuit.

[0055] For example, the thickness of the mounting side plate 221 is equal to the thickness of the light guide plate body 21 and the vertical connecting plate 2222. This arrangement provides sufficient height space for the installation of the light source assembly 3.

[0056] Of course, in other embodiments, the connecting plate 222 can also be configured as a U-shaped connecting plate, with the two sides of the U-shaped connecting plate respectively connecting the mounting side plate 221 and the light guide plate body 21, and a reinforcing rib formed at the bottom, which improves the overall rigidity and torsional resistance of the mounting structure 22.

[0057] The light guide plate body 21, the mounting side plate 221, the horizontal connecting plate 2221 and the vertical connecting plate 2222 are integrally formed by injection molding.

[0058] Combination Figure 1 and Figure 4 As shown, in one embodiment, the backlight module further includes an optical film 5 disposed on the light guide plate body 21. The optical film 5 includes a diffuser and a brightness enhancement film. The diffuser is located above the light guide plate 2, further dispersing the light evenly and hiding the dot pattern of the light guide plate 2. The brightness enhancement film can converge the light scattered at a large angle to the front viewing angle, significantly improving the front brightness and contrast. The optical film 5 must maintain a precise relative position with the light guide plate 2. Any offset or warping will cause uneven light distribution, resulting in uneven patches or bright edges on the screen. Existing designs rely on the mid-frame 4 to hold the film in place, but lack precise lateral positioning, and the optical film 5 is prone to slight slippage during vibration or assembly.

[0059] The vertical connecting plate 2222, located away from the side wall of the mounting side plate 221, is used to position the optical film 5. The vertical connecting plate 2222, positioned at the height of the compensating light source assembly 3, positions the optical film 5, providing a precise positioning reference for one side of the optical film 5. When placing the optical film 5, simply placing one side against the side wall of the vertical connecting plate 2222 provides horizontal positioning, facilitating the assembly of the backlight module and improving assembly efficiency.

[0060] The sidewall of the vertical connecting plate 2222 tightly "wraps" the optical diaphragm 5 within the space formed by itself, the light guide plate body 21, and the subsequently assembled middle frame 4. This greatly restricts the degree of freedom and movement of the optical diaphragm 5 during vibration, effectively preventing collisions and friction between the optical diaphragm 5 and surrounding components. This eliminates the source of abnormal noise and improves the long-term reliability and quiet performance of the backlight module in harsh environments.

[0061] In one embodiment, the middle frame 4 includes a top plate 41, which covers the horizontal connecting plate 2221 and at least a portion of the optical film 5. By covering a portion of the optical film 5, the top plate 41 of the middle frame 4 limits the entire optical film 5, ensuring efficient and uniform output of the optical path and guaranteeing the display effect.

[0062] Figure 5 This is a schematic diagram of the structure of the reflector provided in a specific embodiment of this utility model. Figure 6 This is a partially enlarged view of the light guide plate and reflector assembly after the installation of the light source assembly, as provided in a specific embodiment of this utility model. Figure 5 and Figure 6 As shown, in one embodiment, the backlight module further includes a reflector 6, which is disposed between the light guide plate body 21 and the back plate 1. The reflector 6 is used to reflect the scattered light back into the light guide plate 2, reducing light loss and improving light utilization.

[0063] In one embodiment, the reflector 6 includes a reflective base plate 61 and three reflective side plates 62, which are respectively located on three sides of the reflective base plate 61. The side of the reflective base plate 61 without the reflective side plates 62 faces the mounting structure 22 of the light guide plate 2. The reflective base plate 61 is located between the light guide plate body 21 and the back plate 1, and the reflective side plates 62 are located between the light guide plate body 21 and the middle frame 4. The reflective base plate 61 recovers light leaking from the bottom of the light guide plate body 21 and reflects it back into the light guide plate body 21. The reflective side plates 62 are located between the side of the light guide plate body 21 and the middle frame 4, forming a vertical optical barrier that can efficiently reflect light attempting to escape from the side back into the light guide plate body 21. This arrangement ensures that light is confined to the light guide plate body 21 to the maximum extent, greatly improving light utilization, thereby increasing the overall brightness without increasing the energy consumption of the light source 32, or reducing power consumption at the same brightness. At the same time, it improved the brightness of the display device's edges, eliminated dark edges, and greatly improved the brightness uniformity of the entire display area.

[0064] In addition, the reflective side plate 62 wraps around the edge of the light guide plate 2, and its outer contour matches the inner side of the middle frame 4, while its inner contour matches the light guide plate 2, which can play a role in auxiliary positioning and limiting.

[0065] Figure 7 This is a partially enlarged view of the light guide plate and reflector plate assembled with the back plate according to a specific embodiment of this utility model, as shown below. Figure 7 As shown, after assembling the reflector plate 6, the assembly is fixed to the back plate 1. First, one side of the back plate 1 is aligned and bonded with the adhesive 223 of the mounting side plate 221. Then, the reflector plate 61 is fixed to the back plate 1 with adhesive strips, making the light guide plate 2 more stable in the back plate 1, reducing the adjustment during the assembly process, and improving the assembly accuracy and efficiency.

[0066] like Figure 1 , Figure 4 , Figure 6 and Figure 7As shown, in this embodiment, the backlight module is assembled as follows: First, the light source assembly 3 is fixed to the inner wall of the mounting side plate 221 of the mounting structure 22 of the light guide plate 2 using inner adhesive 225. A base adhesive 223 is pre-applied to the bottom of the mounting side plate 221, and an outer adhesive 224 is pre-applied to the outer wall of the mounting side plate 221. Then, the reflector 6 is assembled. After the reflector 6 is in place, the assembly formed by the light guide plate 2, the light source assembly 3, and the reflector 6 is assembled with the back plate 1, so that the back plate 1 is bonded and fixed to the bottom of the mounting side plate 221 using base adhesive 223. Next, the optical film 5 is placed on the upper surface of the light guide plate body 21, with one side abutting against the side wall of the vertical connecting plate 2222 away from the mounting side plate 221, achieving initial positioning of the optical film 5. Finally, the middle frame 4 is fitted onto the outside of the light guide plate 2 and the back plate 1, so that the top plate 41 of the middle frame 4 is pressed onto the horizontal connecting plate 2221 and at least part of the optical film 5, thereby completing the final fixation of the optical film 5.

[0067] This embodiment also provides a display device including the aforementioned backlight module. After the backlight module is assembled, the display module 100 is fixed above the top plate 41 of the middle frame 4. This display device utilizes the aforementioned backlight module, fundamentally eliminating wear and short circuits in the lamp board 31 caused by relative displacement. By placing the light source assembly 3 within the mounting cavity 23, the risk of the light source 32 detaching is greatly reduced, enhancing the stability and reliability of the backlight module structure, thereby ensuring the display effect of the display device.

[0068] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A backlight module, characterized in that, include: Back panel (1); The light guide plate (2) includes a light guide plate body (21) and a mounting structure (22) integrally formed with the light guide plate body (21) and located on the light incident side. The inner sidewall of the mounting structure (22) forms a mounting cavity (23) with the light guide plate body (21), and the mounting structure (22) is connected to the back plate (1). The light source assembly (3) includes a lamp plate (31) and a plurality of light sources (32) connected to the lamp plate (31). The lamp plate (31) is fixed to the inner wall of the mounting structure (22), and the light sources (32) are located in the mounting cavity (23). The middle frame (4) is located on the outside of the mounting structure (22) and connected to the mounting structure (22).

2. The backlight module according to claim 1, characterized in that, The mounting structure (22) includes a mounting side plate (221) and a connecting plate (222). The mounting side plate (221) and the light guide plate body (21) form the mounting cavity (23). The light source assembly (3) is mounted on the inner side wall of the mounting side plate (221). The connecting plate (222) connects the mounting side plate (221) and the light guide plate body (21).

3. The backlight module according to claim 2, characterized in that, The connecting plate (222) includes a horizontal connecting plate (2221) and a vertical connecting plate (2222). One end of the horizontal connecting plate (2221) is connected to the mounting side plate (221), and the other end is connected to the light guide plate body (21) through the vertical connecting plate (2222). The mounting side plate (221), the horizontal connecting plate (2221), the vertical connecting plate (2222), and the light guide plate body (21) together form the mounting cavity (23).

4. The backlight module according to claim 3, characterized in that, The backlight module also includes an optical film (5) disposed on the light guide plate body (21), the optical film (5) abutting against the side wall of the vertical connecting plate (2222) away from the mounting side plate (221).

5. The backlight module according to claim 4, characterized in that, The middle frame (4) includes a top plate (41) that covers the horizontal connecting plate (2221) and at least a portion of the optical film (5).

6. The backlight module according to claim 2, characterized in that, The bottom of the mounting side plate (221) is fixed to the back plate (1) by adhesive.

7. The backlight module according to claim 2, characterized in that, The outer wall of the mounting side panel (221) is fixed to the middle frame (4) by adhesive.

8. The backlight module according to any one of claims 1-7, characterized in that, The backlight module also includes a reflector (6), which is disposed between the light guide plate body (21) and the back plate (1).

9. The backlight module according to claim 8, characterized in that, The reflector (6) includes a reflector base plate (61) and a reflector side plate (62). The reflector base plate (61) is located between the light guide plate body (21) and the back plate (1), and the reflector side plate (62) is located between the light guide plate body (21) and the middle frame (4).

10. A display device, characterized in that, Includes the backlight module as described in any one of claims 1-9.

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