Backlight module and display device

Abstract

The application provides a backlight module and a display device. The backlight module comprises a back plate, a fixing frame fixed on the back plate along the thickness direction of the backlight module, a diaphragm assembly lapped on the side of the fixing frame away from the back plate, and a middle frame connected with the back plate. The backlight module can ensure the stability of the diaphragm assembly while realizing high screen ratio and narrow frame design, and avoid visual defects caused by space limitation.

Description

Technical Field

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

[0002] In the field of display device design, with continuous technological advancements and rising consumer aesthetic demands, pursuing higher screen-to-body ratios and narrower bezels has become a mainstream trend in the industry. However, this design trend poses unprecedented challenges to the stability of internal components of display devices, especially the fixing of diaphragm components.

[0003] As a key component in the backlight module of a display device, the diaphragm assembly's thermal expansion and contraction characteristics impose strict requirements on its fixing method. In existing technologies, diaphragm assemblies are typically fixed by a top-side connection and overlapping on the left and right sides to ensure sufficient expansion and contraction space during thermal expansion and contraction. However, with increasingly narrow bezel designs, the reserved space for diaphragm assembly expansion and contraction has become more limited. This space constraint may cause visual defects such as water ripples to appear on the diaphragm assembly during expansion and contraction, severely impacting the user's viewing experience.

[0004] Therefore, ensuring the stability of the film assembly and avoiding visual defects caused by space constraints while maintaining a high screen-to-body ratio and narrow bezel design has become a pressing technical problem in the field of display device design. Utility Model Content

[0005] This application provides a backlight module and a display device, which can avoid visual defects caused by space limitations.

[0006] This application provides a backlight module, including:

[0007] Back panel;

[0008] A mounting bracket is fixed to the back plate along the thickness direction of the backlight module;

[0009] A diaphragm assembly, the diaphragm assembly overlapping the side of the fixture away from the back plate;

[0010] The middle frame is connected to the back panel.

[0011] In some embodiments, the inner surface of the middle frame is provided with a groove facing the diaphragm assembly.

[0012] In some embodiments, the mid-frame includes a first portion and a second portion, the first portion extending along the thickness direction of the backlight module, the second portion being connected to the first portion, and the second portion being disposed on the side of the diaphragm assembly away from the mounting bracket, forming a groove with the mounting bracket to accommodate the edge of the diaphragm assembly.

[0013] In some embodiments, the portion of the first part located in the receiving groove is recessed inward to form a groove.

[0014] In some embodiments, the end of the second portion away from the first portion has a guide ramp, the guide ramp being disposed toward the diaphragm assembly.

[0015] In some embodiments, the middle frame further includes a third portion connected to the first portion and connected to the back panel.

[0016] In some embodiments, the back panel includes a main body and an extension, the main body having a light mixing cavity; the extension is connected to the main body and has a receiving groove communicating with the light mixing cavity; the backlight module further includes a diffuser plate, the diffuser plate overlapping the receiving groove to be disposed on the light mixing cavity.

[0017] In some embodiments, the fixing frame further includes a frame body and a limiting portion, the frame body is fixed to the back plate, the diaphragm assembly overlaps the frame body, and the limiting portion protrudes from the frame body and extends toward the diffuser plate.

[0018] In some embodiments, the mounting bracket has a support surface on the side facing the diaphragm assembly, the support surface being configured to support the diaphragm assembly; the mounting bracket further includes a reflective ramp disposed on the surface of the mounting bracket facing the diaphragm assembly, the reflective ramp being connected to the support surface.

[0019] In some embodiments, the reflective slope is at least partially disposed on the limiting portion.

[0020] In some embodiments, the reflective ramp is at least partially disposed on the frame body.

[0021] In some embodiments, the frame body and the limiting part are integrally formed.

[0022] In some embodiments, the fixing frame further includes a hanging ear post, which is fixed to the fixing frame. At least one side edge of the diaphragm assembly is provided with a hanging ear hole, through which the diaphragm assembly is hung on the hanging ear post.

[0023] This application embodiment also provides a display device, including:

[0024] Backlight module, wherein the backlight module is the aforementioned backlight module;

[0025] A liquid crystal module is disposed on the light-emitting side of the backlight module, and the edge of the liquid crystal module is fixed to the middle frame of the backlight module.

[0026] The backlight module and display device provided in this application include a back plate, a mounting bracket, a diaphragm assembly, and a mid-frame. The back plate, mounting bracket, and diaphragm assembly are sequentially fixed along the thickness direction of the backlight module. This backlight module can ensure the stability of the diaphragm assembly while achieving a high screen-to-body ratio and narrow bezel design, avoiding visual defects caused by space limitations. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a first structure of a backlight module provided in an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the structure of the middle frame provided in an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the structure of the backplate provided in an embodiment of this application.

[0031] Figure 4 This is a structural schematic diagram of the fixing frame provided in an embodiment of this application.

[0032] Figure 5 This is a schematic diagram of a second structure of the backlight module provided in an embodiment of this application.

[0033] Figure 6 This is a schematic diagram of the structure of the display device provided in the embodiments of this application. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] This application provides a backlight module and a display device. The backlight module ensures the stability of the film assembly while maintaining a high screen-to-body ratio and narrow bezel design, avoiding visual defects caused by space limitations. The following is a detailed description with reference to the accompanying drawings.

[0036] Please see Figure 1 , Figure 1 This is a schematic diagram of a first structure of a backlight module provided in an embodiment of this application.

[0037] This application provides a backlight module 10. The backlight module 10 is mainly used in liquid crystal display devices to provide a uniform and stable light source for the liquid crystal module 20, enabling the liquid crystal module 20 to display images normally. The backlight module 10 has a display area 101 and a non-display area 102 surrounding the display area 101. The display area 101 is the part used to actually display the image, while the non-display area 102 is mainly used to house some auxiliary structures and circuits. The backlight module 10 can include a direct-lit backlight module and an edge-lit backlight module. The backlight module 10 in this application embodiment is described as a direct-lit backlight module.

[0038] The backlight module 10 includes a back plate 11, a mounting bracket 12, a diaphragm assembly 13, and a middle frame 14.

[0039] The backplate 11 serves as the basic support structure for the backlight module 10. It is typically made of metal or rigid plastic, such as aluminum or steel. These materials have good strength and stability, and can provide a reliable mounting and fixing platform for other components in the backlight module 10.

[0040] The mounting bracket 12 can also be called a plastic frame. The mounting bracket 12 is generally made of plastic, so it has a certain degree of flexibility and elasticity, which can better adapt to the installation requirements of the diaphragm assembly 13 and facilitate operation during assembly.

[0041] The mounting bracket 12 is fixed to the back plate 11 along the thickness direction of the backlight module 10. The diaphragm assembly 13 overlaps the mounting bracket 12 on the side away from the back plate 11. Thus, the mounting bracket 12 provides stable support for the diaphragm assembly 13, ensuring the accurate positioning of the diaphragm assembly 13 in the backlight module 10 and preventing displacement or shaking during operation, thereby ensuring the stable optical performance of the backlight module 10.

[0042] The diaphragm assembly 13 can be composed of a single or multiple optical films, such as diffusers and brightness enhancers. Diffusers are typically made of materials like polyester film, and their surface has a special microstructure that allows for uniform diffusion of light emitted from the light source, making the light softer and more uniform, and avoiding uneven brightness in certain areas. Brightness enhancers generally employ a prism structure, utilizing the principles of light refraction and reflection to improve light utilization and enhance the brightness of the backlight module 10. The performance of the diaphragm assembly 13 directly determines the display effect of the liquid crystal display device 100, such as brightness, contrast ratio, and color uniformity.

[0043] The mid-frame 14 is an outer structural component of the backlight module 10, typically made of plastic or metal. The mid-frame 14 is connected to the backplate 11, usually through screws, welding, or other methods, and is positioned around the mounting bracket 12 and the diaphragm assembly 13. The main function of the mid-frame 14 is to protect and secure the internal components, preventing external dust, moisture, and other impurities from entering the backlight module 10, while also enhancing the overall strength and stability of the backlight module 10.

[0044] The inner surface of the middle frame 14 is provided with a groove 141 facing the diaphragm assembly 13 to form a space reserved for the expansion and contraction of the diaphragm assembly 13. This groove 141 provides a space reserved for the expansion and contraction of the diaphragm assembly 13. When the diaphragm assembly 13 elongates due to thermal expansion and contraction, it can extend into the groove 141, thereby maintaining its stability and effectively avoiding visual defects that may occur due to space limitations.

[0045] In practical applications, the diaphragm assembly 13 undergoes thermal expansion and contraction due to changes in ambient temperature. When the diaphragm assembly 13 elongates due to thermal expansion and contraction, it can extend into the groove 141, thereby avoiding compressive stress caused by space constraints. This compressive stress may cause the diaphragm assembly 13 to deform or be damaged, resulting in visual defects such as bright spots, dark spots, and uneven color. The groove 141 provides sufficient space for the diaphragm assembly 13 to expand and contract freely during thermal expansion and contraction, maintaining its stability and effectively avoiding visual defects that may occur due to space constraints, thus improving the display quality and reliability of the backlight module 10. For example, in high-temperature environments, the diaphragm assembly 13 will elongate due to thermal expansion. Without the groove 141 structure, the diaphragm assembly 13 would be compressed by surrounding components during elongation, causing changes in its optical performance and resulting in problems such as uneven brightness and color deviation. With the groove 141 structure, the diaphragm assembly 13 can smoothly extend into the groove 141, avoiding the generation of compressive stress and thus ensuring the display effect of the backlight module 10.

[0046] In some embodiments, please continue reading Figure 1 as well as Figure 2 , Figure 2The diagram shows the structure of the middle frame provided in the embodiment of this application. The middle frame 14 includes a first part 142 and a second part 143. The first part 142 extends along the thickness direction of the backlight module 10. The second part 143 is connected to the first part 142. The second part 143 is disposed on the side of the diaphragm assembly 13 away from the fixing frame 12, and forms a receiving groove with the fixing frame 12 to accommodate the edge of the diaphragm assembly 13.

[0047] The presence of the first part 142 not only enhances the overall strength of the middle frame 14, but also prevents external factors from interfering with the internal components of the backlight module 10 to a certain extent. The first part 142 and the second part 143 are connected to form a partially closed structure. The second part 143 is located on the side of the diaphragm assembly 13 away from the mounting bracket 12, and the second part 143 is configured to fix the liquid crystal module.

[0048] To further provide sufficient expansion and contraction space for the diaphragm assembly 13, a groove 141 is provided on the side of the first portion 142 facing the receiving groove, and the groove 141 corresponds to the receiving groove. In other words, the portion of the first portion 142 located in the receiving groove is recessed inward to form the groove 141, thereby increasing the depth of the receiving groove and further providing space for the elongated diaphragm assembly 13. The groove 141 also extends on the first portion 142 in a direction away from the second portion 143 to increase the applicability of the middle frame 14. This means that when diaphragm assemblies 13 of different thicknesses are overlapped on the fixing frame 12, the groove 141 can be adapted to further provide space for the elongated diaphragm assembly 13.

[0049] The first part 142 and the second part 143 can be integrally molded. The molding process of the middle frame 14 can be achieved through advanced manufacturing technologies such as injection molding and die casting. For example, in the injection molding process, molten plastic material is injected into a pre-designed mold. After cooling and solidification, the first part 142 and the second part 143 are molded into a single unit. This integral molding method makes the structure of the middle frame 14 more compact, reduces the connection gaps between components, improves the overall sealing performance, and effectively prevents external dust, moisture and other impurities from entering the backlight module 10, thereby protecting the safety of the internal components.

[0050] The second part 143 has a guide slope 1421 at its end furthest from the first part 142, with the guide slope 1421 facing the diaphragm assembly 13. During assembly, the relative positions of the mounting bracket 12 and the middle frame 14 must first be fixed. After fixing, the second part 143 will be suspended above the mounting bracket 12. At this point, the diaphragm assembly 13 needs to be attached to the mounting bracket 12. When the diaphragm assembly 13 approaches the mounting bracket 12, the guide slope 1421 will first contact the diaphragm assembly 13. Due to the specific inclination angle of the slope, the diaphragm assembly 13 will gradually slide along the slope towards the correct position on the mounting bracket 12 after contacting the slope. When the diaphragm assembly 13 slides to the correct position along the guide slope 1421, it can perfectly fit with the mounting bracket 12, ensuring the accurate position of the diaphragm assembly 13 in the backlight module 10. This precise positioning not only ensures the optical performance of the backlight module 10 but also improves the display quality of the entire liquid crystal display device.

[0051] The middle frame 14 also includes a third part 144, which is connected to the first part 142 and is positioned opposite to the second part 143. The third part 144 is connected to the back plate 11, for example, by bolts, so that a stable connection structure is formed between the middle frame 14 and the back plate 11, which enhances the mechanical strength of the entire backlight module 10.

[0052] The third part 144, together with the first part 142 and the second part 143, surrounds the sides of the fixing frame 12 and the diaphragm assembly 13. The resulting enclosure structure can effectively block the intrusion of external dust, moisture, impurities, etc., and prevent these pollutants from damaging the fixing frame 12 and the diaphragm assembly 13.

[0053] The first part 142, the second part 143, and the third part 144 are integrally molded. The integral molding technology gives the middle frame 14 a compact and stable overall structure, avoiding connection gaps and structural weak points caused by splicing multiple structures.

[0054] In some embodiments, please refer to Figure 1 as well as Figure 3 , Figure 3 This is a schematic diagram of the structure of the backplate provided in an embodiment of this application. The backplate 11 includes a main body 111 and an extension 112. The main body 111 has a light mixing cavity 1112. The main body 111 includes a bottom wall and a side wall, which are connected to the bottom wall to jointly enclose and form the light mixing cavity 1112.

[0055] The backlight module 10 also includes a light source, which can be an LED (light-emitting diode), miniLED (mini light-emitting diode), etc. LED light sources have advantages such as high luminous efficiency, long lifespan, and energy saving, making them a commonly used light source type in the backlight module 10. MiniLEDs, as an upgraded version of LEDs, have higher brightness and better contrast performance, further enhancing the display effect. This light source is located on the bottom wall, and the light emitted from the light source is mixed within the mixing cavity 1112. During the mixing process, the light undergoes multiple reflections, refractions, and scatterings, resulting in a more uniform light distribution, thus providing a good foundation for subsequent display.

[0056] The extension 112 is disposed on the side of the main body 111 and is connected to the main body 111. Its placement and structure play a key role in the installation and fixation of the diffuser plate 15. The extension 112 can be disposed at the light outlet of the mixing cavity 1112. The extension 112 has a receiving groove 1121. The depth direction of the receiving groove 1121 can be parallel to the plane of the back plate 11. The receiving groove 1121 communicates with the mixing cavity 1112.

[0057] The extension 112 and the main body 111 can be integrally formed, or they can be set separately and fixed later. In practical applications, it is necessary to comprehensively consider factors such as the specific requirements of the backlight module 10, the production process, the cost budget, and the maintenance requirements, and select the most suitable setting method to achieve an optimal balance between the performance and cost of the backlight module 10.

[0058] From a structural stability perspective, the unibody design eliminates gaps and potential loosening risks between the two components. During the production, transportation, and use of the backlight module 10, the unibody structure can better withstand external vibrations and impacts. In terms of optical performance, the unibody design helps reduce light scattering and reflection losses at the connection points.

[0059] In terms of manufacturing process, the separate configuration allows for optimization of the manufacturing processes of the extension 112 and the main body 111 according to different requirements. For example, the main body 111 can be manufactured using a process suitable for efficient light mixing to ensure that the light emitted by the light source can be fully mixed in the light mixing cavity 1112; while the extension 112 can be manufactured using specific structures and materials according to the installation and fixing requirements of the diffuser plate 15.

[0060] Please continue reading. Figure 1 as well as Figure 3The backlight module 10 also includes a diffuser plate 15, which overlaps within the receiving groove 1121 and covers the mixing cavity 1112. The main function of the diffuser plate 15 is to further diffuse the uniformly mixed light within the mixing cavity 1112, so that the light is more evenly irradiated onto the liquid crystal module 20, thereby ensuring the uniformity and consistency of the displayed image.

[0061] Please refer to Figure 4 , Figure 4 The schematic diagram of the fixing frame provided in the embodiment of this application shows that the fixing frame 12 also includes a frame body 121 and a limiting part 122. The frame body 121 is fixed to the back plate 11, and the diaphragm assembly 13 overlaps the frame body 121. The limiting part 122 protrudes from the frame body 121 and extends towards the diffuser plate 15.

[0062] The limiting part 122 can be provided at the opening of the receiving groove 1121, so that the limiting part 122 is positioned above the diffuser plate 15 along the thickness direction of the backlight module 10, and the limiting part 122 is configured to increase the depth of the receiving groove 1121.

[0063] During the use of the backlight module 10, the diffuser plate 15 may expand and contract due to thermal expansion and contraction. Increasing the groove depth can provide the diffuser plate 15 with more room to move, so that the diffuser plate 15 can expand and contract freely during thermal expansion and contraction.

[0064] In addition to increasing the groove depth to accommodate the expansion and contraction of the diffuser plate 15, the limiting part 122 extends from the non-display area 102 of the backlight module 10 into the display area 101, further limiting the diffuser plate 15. This restricts the displacement of the diffuser plate 15 in the direction perpendicular to the thickness of the backlight module 10, ensuring that the diffuser plate 15 is always in the correct position, and further improving the structural stability and optical performance of the backlight module 10.

[0065] Please refer to Figure 1 as well as Figure 4The surface of the limiting part 122 facing the diffuser plate 15 is flush with the inner wall of the receiving groove 1121, ensuring that the size of the opening of the receiving groove 1121 remains consistent in the thickness direction of the backlight module 10, which is beneficial for the assembly of the diffuser plate 15. If the limiting part 122 compresses the area of ​​the opening of the receiving groove 1121, the space between the diffuser plate 15 and the receiving groove 1121 becomes smaller, and the diffuser plate 15 may interfere with the limiting part 122 or the edge of the opening during insertion. For example, the edge of the diffuser plate 15 may get stuck in the narrow gap formed by the limiting part 122 and the opening, making it impossible to smoothly insert into the receiving groove 1121. If the limiting part 122 expands the area of ​​the opening of the receiving groove 1121, it may not be able to fully exert its limiting effect on the diffuser plate 15. One of the main functions of the limiting part 122 is to limit the displacement of the diffuser plate 15 in the direction perpendicular to the thickness of the backlight module 10, ensuring its positional accuracy. When the area of ​​the slot is expanded, the space for the diffuser plate 15 to move within the slot increases, and the constraint force of the limiting part 122 on the diffuser plate 15 is weakened.

[0066] The frame body 121 has a support surface 123 on the side facing the diaphragm assembly 13, and the support surface 123 is configured to support the diaphragm assembly 13.

[0067] The mounting bracket 12 also includes a reflective ramp 124, which is disposed on the surface of the mounting bracket 12 facing the diaphragm assembly 13 and connected to the support surface 123. The reflective ramp 124 and the support surface 123 form a continuous and smooth optical transition surface. The reflective ramp 124 faces the diaphragm assembly 13 to ensure that the light after the diffuser plate 15 is applied can be efficiently reflected onto the diaphragm assembly 13. The diffuser plate 15 is responsible for diffusing the light emitted by the light source in the backlight module 10, uniformly scattering the light emitted by the point light source or line light source, making the light distribution more uniform. However, the diffused light may have directional dispersion during propagation, causing some light to fail to effectively illuminate the diaphragm assembly 13. At this time, the reflective ramp 124 plays a key role. The reflective ramp 124 can reflect and converge this dispersed light, redirecting it to the diaphragm assembly 13, thereby improving the light utilization efficiency.

[0068] The reflective inclined surface 124 is at least partially disposed on the limiting portion 122, and / or the reflective inclined surface 124 is at least partially disposed on the frame body 121.

[0069] The mounting bracket 12 can be made of a highly reflective material. Highly reflective materials have extremely high reflectivity, which can reflect most of the incident light back, reducing light absorption and loss.

[0070] Alternatively, the mounting bracket 12 may also have an inclined surface connected to the supporting surface 123. A reflective sheet, reflective film, or reflective coating may be provided on the inclined surface to form a reflective inclined surface 124, which can also reflect the light after the diffuser plate 15 has acted upon onto the diaphragm assembly 13.

[0071] The frame body 121 and the limiting part 122 are integrally formed. This integral forming process offers numerous advantages, ensuring the connection strength and precision between the frame body 121 and the limiting part 122, and preventing structural instability and optical performance degradation caused by assembly errors. During the integral forming process, precise mold design and manufacturing processes guarantee the dimensional accuracy and surface quality of the reflective slope 124 and the supporting surface 123, ensuring they meet optical requirements. Simultaneously, the integral forming structure reduces the number of parts, simplifies the assembly process, and improves production efficiency and product consistency.

[0072] Please refer to Figure 5 , Figure 5 This is a schematic diagram of a second structure of the backlight module provided in this application embodiment. The mounting bracket 12 also includes a hanging post 125, which is fixed to the side of the frame body 121 away from the back plate 11. At least one edge of the diaphragm assembly 13 is also provided with a hanging hole 131, through which the diaphragm assembly 13 is hung on the hanging post 125 to fix the diaphragm assembly 13. The hanging post 125 is often located on the top side of the display device. This suspension and fixing method is not only convenient to install, but also effectively ensures the stability of the diaphragm assembly 13. During the use of the display device 100, the diaphragm assembly 13 may be subjected to various forces, such as gravity and vibration. Through the cooperation of the hanging post 125 and the hanging hole 131, the diaphragm assembly 13 can be firmly fixed on the mounting bracket 12, preventing displacement or loosening, thereby ensuring the optical performance and display effect of the display device 100.

[0073] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. This application also provides a display device 100, which is an electronic device or component whose core function is to convert electronic signals, digital signals, or other forms of signals into visual information such as images, text, and numbers that are recognizable to the human eye. The display device 100 can be a television, computer monitor, mobile phone screen, vehicle display screen, etc.

[0074] The display device 100 includes a backlight module 10 and a liquid crystal module 20. The backlight module 10 is the same as described in the above embodiments. The liquid crystal module 20 is disposed on the light-emitting side of the backlight module 10, and the edge of the liquid crystal module 20 is fixed to the middle frame 14 of the backlight module 10. For example, the liquid crystal module 20 is fixed to the second part 143 by adhesive. This fixing method is simple and reliable, and can ensure that the liquid crystal module is accurately positioned on the backlight module 10 without shaking or displacement.

[0075] The adhesive can be a liquid dispensing adhesive or a high-strength solid structural adhesive. Liquid dispensing adhesives have good fluidity, allowing them to evenly cover the contact surface between the second part 143 and the liquid crystal module 20 during the dispensing process. After the liquid dispensing adhesive cures, it forms a layer with a certain degree of elasticity. This layer not only firmly fixes the liquid crystal module 20 to the second part 143 but also buffers some stress.

[0076] High-strength solid structural adhesives offer superior strength and stability. They cure rapidly in a short time, forming a robust bond. Using high-strength solid structural adhesives to fix the LCD module 20 ensures a secure and reliable connection between the LCD module 20 and the second part 143, preventing loosening due to prolonged use or changes in ambient temperature.

[0077] Because the backlight module 10 provides uniform, stable, wide-range, and high-brightness light, the LCD module 20 can more accurately modulate the light, fully utilize its display performance, and bring users a more realistic visual experience.

[0078] This application also provides a method for manufacturing a display device 100. This method achieves efficient assembly of the components of the display device 100 through a series of precise and orderly steps, so as to produce a display device 100 with excellent performance.

[0079] Step 1: Bend the back panel 11 into shape.

[0080] First, the back panel 11 is bent to form a main body 111 and an extension 112. The main body 111 has a light mixing cavity 1112, which is a key area for light mixing and propagation in the backlight module 10, ensuring uniform light distribution and providing a good foundation for subsequent display. The extension 112 is bent to form a C-fold structure (i.e., a receiving groove 1121), a clever design that facilitates the subsequent fixing of the frame.

[0081] Step 2: Install the mounting bracket 12.

[0082] The mounting bracket 12 (also known as a frame) is fixed to the extension 112 of the back panel 11. The mounting bracket 12 consists of a frame body 121 and a limiting part 122. During assembly, the frame body 121 is fixed to the extension 112 of the back panel 11 using a suitable fixing method, such as adhesive tape. The limiting part 122 is positioned along the thickness direction of the backlight module 10 at the opening of the C-fold structure (accommodating groove 1121), and its function is crucial. On one hand, the limiting part 122 can limit the diffuser plate 15, preventing displacement during use; on the other hand, the limiting part 122 increases the groove depth, further satisfying the space required by the diffuser plate 15 during expansion or contraction, avoiding structural damage or optical performance degradation caused by changes in the size of the diffuser plate 15.

[0083] Furthermore, the frame is made of injection-molded material and undergoes a special process to give it a high reflectivity. This high reflectivity effectively improves light utilization and reduces light loss, thereby enhancing the brightness and contrast of the display device 100.

[0084] Step 3: Fix the diffuser plate 15.

[0085] A diffuser plate 15 is provided and overlapped within the C-fold structure (receiving groove 1121), i.e., below the fixing bracket 12, to secure the diffuser plate 15. The diffuser plate 15 covers the mixing cavity 1112 and plays a role in uniformly diffusing light within the backlight module 10. It can evenly scatter the light emitted by point or line light sources, making the light distribution more uniform and reducing the appearance of light spots and dark areas. By overlapping the diffuser plate 15 within the C-fold structure and utilizing the limiting effect of the fixing bracket 12, the installation position of the diffuser plate 15 is ensured to be accurate and stable, providing a good foundation for subsequent optical processing.

[0086] Step 4: Install diaphragm assembly 13.

[0087] A diaphragm assembly 13 is provided and overlapped onto the mounting bracket 12. The diaphragm assembly 13 typically includes various functional films, such as diffusion films and brightness enhancement films, which can further adjust and process light, improving light quality and uniformity. During installation, the top side of the diaphragm assembly 13 is hung on the positioning posts of the mounting bracket 12. The positioning posts are designed to precisely position the diaphragm assembly 13, ensuring its accuracy and stability during assembly. By overlapping the diaphragm assembly 13 onto the mounting bracket 12 and cooperating with the positioning posts, reliable installation of the diaphragm assembly 13 is achieved, providing a guarantee for subsequent cooperation with the liquid crystal module 20.

[0088] Step 5: Connect the middle frame 14.

[0089] The middle frame 14 is connected to the back plate 11 so that the middle frame 14 can surround the fixing frame 12 and the diaphragm assembly 13. As an external protective structure of the display device 100, the middle frame 14 not only protects the internal components but also enhances the overall structural strength of the display device 100. A groove 141 is provided on the middle frame 14 corresponding to the left and / or right sides of the diaphragm assembly 13. When the diaphragm assembly 13 is installed, the groove 141 faces the diaphragm assembly 13, thus solving the space requirement problem when the diaphragm assembly 13 expands or contracts, ensuring the optical performance and stability of the display device 100.

[0090] Step 6: Fix the LCD module 20.

[0091] A liquid crystal module 20 is provided, which is fixed to the mid-frame 14 using liquid dispensing or high-strength solid structural adhesive to form a complete display device 100. By using liquid dispensing or high-strength solid structural adhesive, the connection between the liquid crystal module 20 and the mid-frame 14 can be ensured to be firm and reliable, while reducing damage to the liquid crystal module 20.

[0092] The entire display device 100 comprises three key structural components: a backplate 11, a mounting bracket 12, and a mid-frame 14. Through ingenious structural design, the diffuser plate 15, the film assembly 13, and the liquid crystal module 20 are placed in different spaces, maximizing space utilization. This design not only solves the problem of achieving a full-screen display when using a liquid crystal module 20 with a narrow black border area, but also improves the overall performance and reliability of the display device 100.

[0093] In this embodiment, a mounting bracket 12 is attached to the back plate 11. The mounting bracket 12 enters the display area 101 and presses down on the diffuser plate 15, effectively solving the problem of insufficient space caused by the expansion or contraction of the diffuser plate 15. The mounting bracket 12 is configured to cooperate with the middle frame 14, and the diaphragm assembly 13 is attached to the mounting bracket 12. The middle frame 14 has a groove 141 on the inner surface of the diaphragm assembly 13, which faces the diaphragm assembly 13 and can meet the space requirements for the expansion or contraction of the diaphragm assembly 13. At the same time, the middle frame 14 can also fix the liquid crystal module 20 with screen sealing adhesive, solving the problem of fixing the liquid crystal module 20, realizing a display device 100 with a narrow bezel and full-screen architecture, which has significant technical advantages and application value.

[0094] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0095] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0096] The backlight module and display device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A backlight module, characterized in that, include: A backplate, the backplate comprising a main body and an extension, the main body having a light mixing cavity; The extension is connected to the main body, and the extension has a receiving groove that communicates with the light mixing cavity; A diffuser plate, which overlaps within the receiving groove and is disposed on the mixing cavity; A fixing frame is fixed to the back plate along the thickness direction of the backlight module. The fixing frame includes a frame body and a limiting part, and the frame body is fixed to the back plate. A diaphragm assembly is attached to the side of the fixing frame away from the back plate, the diaphragm assembly is attached to the frame body, and the limiting portion protrudes from the frame body and extends toward the diffuser plate; The middle frame is connected to the back plate, and the inner surface of the middle frame is provided with a groove facing the diaphragm assembly.

2. The backlight module according to claim 1, characterized in that, The middle frame includes a first part and a second part. The first part extends along the thickness direction of the backlight module, and the second part is connected to the first part. The second part is disposed on the side of the diaphragm assembly away from the fixing frame. The first part, the second part, and the fixing frame surround and form a receiving groove that can accommodate the edge of the diaphragm assembly.

3. The backlight module according to claim 2, characterized in that, The first portion located in the receiving groove is recessed inward to form a groove.

4. The backlight module according to claim 2, characterized in that, The end of the second portion away from the first portion has a guide ramp, which is positioned toward the diaphragm assembly.

5. The backlight module according to claim 4, characterized in that, The middle frame also includes a third part, which is connected to the first part and to the back plate.

6. The backlight module according to claim 1, characterized in that, The mounting bracket has a support surface on the side facing the diaphragm assembly, the support surface being configured to support the diaphragm assembly; the mounting bracket also includes a reflective ramp, the reflective ramp being disposed on the surface of the mounting bracket facing the diaphragm assembly, the reflective ramp being connected to the support surface.

7. The backlight module according to claim 6, characterized in that, The reflective inclined surface is at least partially disposed on the limiting portion.

8. The backlight module according to claim 6, characterized in that, The reflective ramp is at least partially disposed on the frame body.

9. The backlight module according to claim 1, characterized in that, The main frame body and the limiting part are integrally formed.

10. The backlight module according to claim 1, characterized in that, The fixing frame also includes a hanging ear post, which is fixed to the fixing frame. At least one edge of the diaphragm assembly is provided with a hanging ear hole, and the diaphragm assembly is hung on the hanging ear post through the hanging ear hole.

11. A display device, characterized in that, include: A backlight module, wherein the backlight module is the backlight module according to any one of claims 1 to 10; A liquid crystal module is disposed on the light-emitting side of the backlight module, and the edge of the liquid crystal module is fixed to the middle frame of the backlight module.

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