Backlight module, display device, and touch display device

Abstract

A backlight module (1), a display device (1000), and a touch display device. The backlight module (1) is used in the display device (1000), and comprises a back panel (11), a light-emitting member (12), a connecting support (13), a composite film (14), and a support foam (15). The light-emitting member (12) is mounted on the back panel (11) and is configured to emit light. The composite film (14) is arranged on the light exit side of the light-emitting member (12) and spaced apart from the back panel (11), and is configured to receive the light emitted by the light-emitting member (12) and perform diffusion and brightness enhancement on the light emitted by the light-emitting member (12) to form a surface light source. The connecting support (13) is arranged on the outer peripheral side of the composite film (14) and is connected to the back panel (11), and the connecting support (13) is connected to an edge portion of the composite film (14) so as to tension the composite film (14) outward. The support foam (15) is arranged between the back panel (11) and the composite film (14), one end of the support foam (15) abuts against the composite film (14), and the other end of the support foam (15) abuts against the back panel (11).

Description

A backlight module, a display device and a touch display device

[0001] Related applications

[0002] This application claims priority to the following Chinese patent applications:

[0003] Application number 2024116163854, filed on November 13, 2024, entitled "A backlight module, display device and touch display device"; and application number 2024227751836, filed on November 13, 2024, entitled "A backlight module, display device and touch display device";

[0004] The full text of the aforementioned patent is incorporated herein by reference. Technical Field

[0005] This application relates to the field of display device technology, and in particular to a backlight module, a display device, and a touch display device. Background Technology

[0006] Display devices typically include display modules, backlight modules, and control modules. The backlight module is composed of a backplate, lamp support frame, reflector, light-emitting element, diffuser plate, and optical film. The display module includes a display screen (liquid crystal display). The light emitted by the light-emitting element passes through the diffuser plate and optical film in sequence and is projected onto the display screen (liquid crystal display) of the display device. The diffuser plate diffuses the light, and the optical film can converge and focus the diffused light to achieve the purpose of brightening.

[0007] In related technologies, the backlight module of a display device includes a diffuser plate and an optical film. The manufacturing process of the diffuser plate and the optical film is complex and the material cost is high. The display device is heavy, the assembly process cost and material cost are high, and the use of lamp support brackets in the backlight module results in shadows, poor display effect and instability. Summary of the Invention

[0008] This application provides a backlight module, a display device, and a touch display device, which can solve the problem of inconvenient assembly of the diffuser plate and optical film of the backlight module.

[0009] In a first aspect, embodiments of this application provide a backlight module, including a backplate, a light-emitting element, a connecting bracket, a composite film, and supporting foam. The light-emitting element is mounted on the backplate and is configured to emit light. The composite film is disposed on the light-emitting side of the light-emitting element and spaced apart from the backplate. The composite film is configured to receive the light emitted by the light-emitting element and to atomize and brighten the light emitted by the light-emitting element to form a surface light source. The connecting bracket is disposed on the outer periphery of the composite film and connected to the backplate. The connecting bracket is configured to connect the edge portion of the composite film to stretch and straighten the composite film outward. The supporting foam is disposed between the backplate and the composite film, with one end of the supporting foam abutting against the composite film and the other end of the supporting foam abutting against the backplate.

[0010] Based on the backlight module provided in this application embodiment, a thin composite film is used to atomize and brighten the light, and the composite film is installed only through a connecting bracket, thereby achieving the lightweighting of the backlight module and the simplification of the installation process.

[0011] In some embodiments, the connecting bracket includes: a mounting base connected to a back plate; the connecting base includes a first mounting portion and a second mounting portion, the second mounting portion and the mounting base being located on the same side of the first mounting portion and respectively connected to the first mounting portion, and a composite diaphragm being mounted on the second mounting portion.

[0012] Based on the backlight module provided in the embodiments of this application, the connecting bracket can be used to install both the cover plate and the composite film at the same time. The structure of the connecting bracket is simple, and there is no need to add additional related structures to install the cover plate and the composite film separately. At the same time, it can also simplify the installation process.

[0013] In some embodiments, the composite diaphragm has a connection hole, a second mounting portion passes through the connection hole, and the second mounting portion is in contact with at least a portion of the wall of the connection hole to tension the composite diaphragm flat.

[0014] Based on the backlight module provided in this application embodiment, the phenomenon of loosening or falling off of the composite film during installation, transportation and use is effectively reduced, and the service life of the composite film is extended.

[0015] In some embodiments, the second mounting portion extends in a direction perpendicular to the surface of the composite diaphragm; and / or, the first mounting portion extends in a direction parallel to the surface of the composite diaphragm.

[0016] Based on the backlight module provided in the embodiments of this application, the structural stability of the connecting bracket is enhanced, and it is easier to install the composite film and the cover plate together.

[0017] In some embodiments, the backlight module further includes a first adhesive layer disposed between the composite film and the first mounting portion, and bonded to the composite film and the first mounting portion respectively.

[0018] Based on the backlight module provided in this application embodiment, the possibility of composite film detachment is effectively reduced, ensuring its reliability during long-term use.

[0019] In some embodiments, the mounting base includes a first plate and a second plate, the second plate being connected between the first mounting portion and the first plate, the first plate extending in a direction parallel to the surface of the composite film, and the surface of the first plate being in contact with the surface of the back plate.

[0020] Based on the backlight module provided in the embodiments of this application, the spacing between the first plate and the first mounting part can effectively reduce the interference between the first plate and the composite film and other structures, and ensure the convenience of mounting other structures on the first mounting part.

[0021] In some embodiments, the composite diaphragm is a rectangular diaphragm having a long side and a wide side, and the number of connecting brackets is multiple; wherein some connecting brackets are arranged at intervals along the long side of the composite diaphragm and connected to the edge portion of the composite diaphragm; and / or, wherein some connecting brackets are arranged at intervals along the wide side of the composite diaphragm and connected to the edge portion of the composite diaphragm.

[0022] Based on the backlight module provided in the embodiments of this application, multiple connecting brackets can provide multiple fixing points for the composite film, so as to ensure a tighter connection between the composite film and the back plate, realize the uniform fixing of the composite film in the entire backlight display module, reduce local stress concentration, and increase the actual service life of the composite film.

[0023] In some embodiments, the composite film includes a first optical film, a brightness enhancement layer, and a diffusion film stacked sequentially; wherein, the first optical film includes a first substrate, a first optical layer, and a microstructure layer, the microstructure layer being connected to a first surface of the first substrate, and the first optical layer being connected to a second surface of the first substrate; the diffusion film includes a second substrate and a second optical layer, the second optical layer being connected to the surface of the second substrate facing away from the first optical film; the brightness enhancement layer includes a first brightness enhancement film and a second brightness enhancement film stacked together, the first brightness enhancement film having a first prism, the second brightness enhancement film having a second prism, and the angle difference between the first prism and the second prism being 90°.

[0024] Based on the backlight module provided in this application embodiment, the composite film can both atomize and brighten light, and can replace the diffuser plate and optical film in related technologies. It should be set in the backlight module, simplifying the structure of the backlight module, simplifying the assembly process, saving material usage, and reducing the space occupied by the backlight module.

[0025] Secondly, embodiments of this application provide a display device, including a display module and a backlight module; the display module includes a liquid crystal display screen, which is stacked on the side of the composite film away from the light-emitting element.

[0026] Based on the display device provided in the embodiments of this application, the atomization effect can be guaranteed while reducing asynchronous movement between the composite film and the liquid crystal display screen, thereby reducing the probability of wear and tear defects.

[0027] Thirdly, embodiments of this application also provide a display device, including a display module and a backlight module. The display module includes a liquid crystal display screen, which is stacked on the side of the composite film away from the light-emitting element. The display device also includes a cover plate and a frame, with a connecting bracket connected to the frame and the frame connected to a back plate, so that the connecting bracket is mounted on the back plate through the frame. The frame includes a main body and an extension, with the main body disposed on the outer periphery of the cover plate and the extension extending along the edge of the top surface of the cover plate. The connecting bracket is connected to the main body, and the edge of the cover plate is disposed between the extension and the connecting bracket. The extension and the connecting bracket together fix the cover plate.

[0028] The display device provided in this application embodiment can provide a stable connection effect, improve the installation stability between the mounting base and the frame, reduce the phenomenon of displacement of the mounting base during use, and further optimize the display effect.

[0029] In some embodiments, the mounting base is connected to the frame; the edge portion of the cover plate is disposed between the extension and the first mounting portion, and the extension and the first mounting portion together fix the cover plate.

[0030] Based on the display device provided in the embodiments of this application, the connecting bracket can be used to simultaneously install the cover plate and the composite film. The connecting bracket has a simple structure and does not require additional related structures to install the cover plate and the composite film separately, which also simplifies the installation process.

[0031] Fourthly, embodiments of this application provide a touch display device, including a touch component; the touch component includes a backlight module; or, the touch component includes a display device.

[0032] The touch display device provided in the embodiments of this application can realize human-computer interaction functions more intuitively. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the drawings used in the description of the embodiments or related technologies 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.

[0034] Figure 1 is a cross-sectional structural diagram of a backlight module in one embodiment of this application;

[0035] Figure 2 is an enlarged schematic diagram of point D in Figure 1;

[0036] Figure 3 is a three-dimensional structural diagram of the connecting bracket in one embodiment of this application;

[0037] Figure 4 is a three-dimensional structural diagram of the connection bracket and composite diaphragm in one embodiment of this application;

[0038] Figure 5 is a schematic cross-sectional view of the composite membrane in one embodiment of this application;

[0039] Figure 6 is a cross-sectional view of the composite membrane in another embodiment of this application;

[0040] Figure 7 is a cross-sectional view of the composite membrane in another embodiment of this application;

[0041] Figure 8 is a cross-sectional structural diagram of a display device in one embodiment of this application;

[0042] Figure 9 is an enlarged view of point E in Figure 8;

[0043] Figure 10 is a cross-sectional structural diagram of a touch display device in one embodiment of this application.

[0044] Reference numerals: 1000, Display device; 1, Backlight module; 11, Back panel; 111, Back panel body; 112, Transition section; 113, Support section; 12, Light-emitting element; 13, Connecting bracket; 131, Mounting base; 1311, First plate; 1311a, Mounting hole; 1312, Second plate; 132, Connecting base; 1321, First mounting section; 1322, Second mounting section; 1323, First adhesive layer; 14, Composite film; 141, Connecting hole; 100, First optical film; 110, First substrate; 120, First optical layer; 130, Microstructure layer; 121, First optical adhesive; 122, Diffusion particles; 2 00. Diffuser film; 210. Second substrate; 220. Second optical layer; 221. Second optical adhesive; 222. Second refractive material; 300. Brightness enhancement layer; 310. First brightness enhancement film; 320. Second brightness enhancement film; 400. Adhesive material; 15. Supporting foam; 16. Reflective sheet; 161. Reflective part; 162. Bending part; 2. Display module; 21. Liquid crystal display screen; 3. Cover plate; 4. Frame; 41. Main body; 411. Mating groove; 42. Extension part; 43. Accommodating cavity; 44. Light transmission hole; 5. Locking element; 6. Capacitive touch film; 7. Infrared touch module; 8. Filter element; X. Long side; Y. Wide side. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0046] Display devices typically include display modules, backlight modules, and control modules. The backlight module is composed of a backplate, lamp support frame, reflector, light-emitting element, diffuser plate, and optical film. The display module includes a display screen (LCD). Light emitted from the light-emitting element passes sequentially through the diffuser plate and optical film before being projected onto the display screen (LCD). The diffuser plate atomizes the light, and the optical film converges and focuses the atomized light to enhance brightness. The optical film is a multi-layered film, and possible combinations of these layers include: upper diffuser film + 0° brightness enhancement film, upper diffuser film + 0° brightness enhancement film + 90° brightness enhancement film, upper diffuser film + 90° brightness enhancement film + 0° brightness enhancement film, etc.

[0047] In related technologies, backlight modules include diffuser plates and optical films. The manufacturing process of diffuser plates and optical films is complex and the material cost is high. During assembly, it is necessary to align and fix the light-emitting components, lamp support frame, diffuser plate, optical film and LCD screen of the backlight module and fix the relative positions of each structure before the assembly can be completed. The assembly process is complex and costly.

[0048] Furthermore, the diffuser plates in the exemplary technologies are typically about 2.0mm thick and weigh over 4KG, which not only increases the overall weight of the device, but also requires a lamp support bracket, which can easily cause shadows that affect the display effect. When the diffuser plate collides with the bent edge of the back panel, the diffuser plate is also prone to cracking and other defects, resulting in unstable display effects and affecting the user experience.

[0049] Based on this, embodiments of this application provide a backlight module, a display device, and a touch display device. This addresses the technical problems in existing designs, such as the large weight of the display device, high assembly and material costs, shadows in the backlight module using a lamp support frame, and poor and unstable display effects.

[0050] Please refer to Figure 1, which is a partial cross-sectional view of a backlight module 1 provided in an embodiment of this application. The backlight module 1 is configured as a display device. In this embodiment, the backlight module 1 uses a composite film. The composite film has good optical performance and can replace the diffuser plate and optical film of the existing backlight module design.

[0051] In one embodiment, referring to FIG1, the backlight module 1 of this application includes a back plate 11, a light-emitting element 12, a connecting bracket 13, a composite film 14, and a supporting foam 15. The light-emitting element 12 is capable of emitting light and is mounted on the back plate 11; the connecting bracket 13 is connected to the back plate 11; the composite film 14 is mounted on the connecting bracket 13 and is disposed on the light-emitting side of the light-emitting element 12 (the light-emitting side of the light-emitting element 12 is the side of the light-emitting element 12 away from the back plate body 111) and is spaced apart from the light-emitting element 12. The composite film 14 receives the light emitted by the light-emitting element 12 and atomizes and brightens the light emitted by the light-emitting element 12 to form a surface light source, so as to provide sufficient brightness and a uniformly distributed light source for the display device. The connecting bracket 13 is disposed on the outer periphery of the composite diaphragm 14 (the outer periphery of the composite diaphragm 14 is the outer edge away from the center of the composite diaphragm 14, for example, the composite diaphragm 14 is rectangular, and the outer periphery of the four outer edges of the composite diaphragm 14) and is connected to the back plate 11. The connecting bracket 13 is configured to connect the edge portion of the composite diaphragm 14 to stretch the composite diaphragm 14 outward and make the composite diaphragm 14 straight. The supporting foam 15 is disposed between the back plate 11 and the composite diaphragm 14. One end of the supporting foam 15 abuts against the composite diaphragm 14 to support the composite diaphragm 14, and the other end of the supporting foam 15 abuts against the back plate 11.

[0052] In the embodiments of this application, the back plate 11 is configured to support the light-emitting element 12, the connecting bracket 13, and other related functional components, serving to support and facilitate the assembly of other components. The light-emitting element 12 is configured to provide backlighting, emitting light towards the side where the display module 2 is located. It is understood that the light-emitting element 12 generally includes multiple LEDs. When multiple LEDs emit light simultaneously, there will be a situation where the light at the position corresponding to an LED is bright, while the light between two adjacent LEDs is dim, i.e., shadows will appear. In the embodiments of this application, by setting the backlight module 1 to include a composite film 14, the use of a lamp support frame is avoided. The composite film 14 can atomize the light emitted by multiple LEDs to form a surface light source, preventing shadows. When the backlight module 1 is set in the display device, the display device can have a more uniform display effect. At the same time, the composite film 14 also has a brightening effect on the light, so that the light emitted by the light-emitting element 12 can be utilized more fully, and the display device can have a better display effect.

[0053] The backlight module 1 in this application eliminates the diffuser plate, optical film, lamp support frame and corresponding mounting structure in related technologies by using a composite film 14. The thin composite film 14 is used to achieve light atomization and brightness enhancement, saving material usage. There is no need to assemble the diffuser plate and optical film separately, and the alignment process between the diffuser plate and optical film is also saved. The composite film 14 is installed only through the connecting bracket 13, thereby achieving the lightweighting of the backlight module 1 and the simplification of the installation process.

[0054] It is understandable that the end of the supporting foam 15 that abuts against the composite film 14 can be connected to the composite film 14 by adhesive, and the end of the supporting foam 15 that abuts against the back plate 11 can be connected to the back plate 11 by adhesive. The supporting foam 15 is arranged near the edge of the composite film 14, and the supporting foam 15 connects the composite film 14 and the back plate 11. The supporting foam 15 is arranged along the edge of the composite film 14. It is understood that the edge of the composite film 14 is the outer part away from the center of the composite film 14. The supporting foam 15 is arranged along the outer edge of the composite film 14 and is bonded between the back plate 11 and the composite film 14. This can better tension and flatten the composite film 14. After the light emitted by the light-emitting element 12 is atomized by the composite film 14, the emission position and angle of the light are more uniform. The supporting foam 15 can also effectively block the propagation of light, thereby preventing light leakage from the backlight module 1.

[0055] In addition, the supporting foam 15 has good elasticity and cushioning effect. On the one hand, it can evenly release the connection pressure between the composite diaphragm 14 and the back plate 11, thereby reducing the deformation of the composite diaphragm 14 in some parts due to excessive pressure, maintaining the flatness of the composite diaphragm 14, and better connecting the composite diaphragm 14 and the back plate 11. On the other hand, the supporting foam 15 can absorb external vibration or impact, thereby reducing the impact of external vibration or impact on the composite diaphragm 14, improving the vibration resistance of the backlight module 1, and improving the stability of the composite diaphragm 14 installation.

[0056] In some embodiments, the backplate 11 includes a backplate body 111, a transition portion 112, and a support portion 113. A first end of the transition portion 112 is connected to the edge portion of the backplate body 111, and a second end of the transition portion 112 extends obliquely away from the backplate body 111 and closer to the composite film 14. The support portion 113 is connected to the second end of the transition portion 112. The light-emitting element 12 is mounted on the backplate body 111. The edge portion of the composite film 14 is disposed opposite to the support portion 113 (i.e., the edge portion of the composite film 14 is the portion of the composite film that is disposed opposite to the support portion 113). The support foam 15 is disposed between the support portion 113 and the edge portion of the composite film 14, and the other end of the support foam 15 abuts against the support portion 113. It is understandable that the transition portion 112 extends outward relative to the back plate body 111. The transition portion 112 can connect the support portion 113 to the back plate body 111 and can also serve as a transition, so that the support portion 113 can be arranged parallel to the composite diaphragm 14 to provide better support for the composite diaphragm 14.

[0057] In some embodiments, the backlight module 1 further includes a reflective sheet 16, which is disposed on the back plate 11 and located on the same side of the back plate 11 as the light-emitting element 12. The reflective sheet 16 is configured to reflect the light emitted by the light-emitting element 12, so that the light is concentrated and emitted from the light-emitting side to improve light utilization. In one embodiment, the reflective sheet 16 includes a reflective portion 161 and a bent portion 162, which are connected. The bent portion 162 is located on the support portion 113, and a support foam 15 is disposed between the bent portion 162 and the edge portion of the composite film 14. The other end of the support foam 15 abuts against the bent portion 162.

[0058] In some embodiments, referring to Figures 2 and 3, the connecting bracket 13 includes a mounting base 131 and a connecting base 132. The mounting base 131 is mounted on the back plate 11, and the connecting base 132 includes a first mounting portion 1321 and a second mounting portion 1322. The second mounting portion 1322 and the mounting base 131 are located on the same side of the first mounting portion 1321 and are respectively connected to the first mounting portion 1321. The composite diaphragm 14 is mounted on the second mounting portion 1322.

[0059] Understandably, the mounting base 131 is installed on the back plate 11 to fix the connecting base 132 and provide it with stable support. The second mounting part 1322 and the mounting base 131 are located on the same side of the first mounting part 1321 and extend in the direction away from the cover plate 3. The first mounting part 1321 will not interfere with the cooperation between the second mounting part 1322 and the composite diaphragm 14, which facilitates the installation of the second mounting part 1322 and the composite diaphragm 14. This layout allows the connecting bracket 13 to cooperate with the installation of the composite diaphragm 14. The structure of the connecting bracket 13 is simple and does not require additional related structures to install the composite diaphragm 14 separately, which also simplifies the installation process.

[0060] In some embodiments, in order to achieve the cooperative installation of the composite diaphragm 14 and the second mounting part 1322, the composite diaphragm 14 has a connecting hole 141. The connecting hole 141 penetrates the composite diaphragm 14 in a direction perpendicular to the plate surface of the composite diaphragm 14 (the plate surface of the composite diaphragm 14 refers to the inner and outer surfaces of the composite diaphragm 14; taking the perspective shown in FIG1 as an example, the plate surface of the composite diaphragm 14 refers to the upper and lower surfaces of the composite diaphragm 14). The second mounting part 1322 passes through the connecting hole 141 and is in contact with at least a portion of the wall surface of the composite diaphragm 14 that defines the connecting hole 141, so as to position the composite diaphragm 14 relative to the light-emitting element 12. Optionally, the second mounting part 1322 can be inserted into the connection hole 141 to prevent the composite diaphragm 14 from easily passing through the second mounting part 1322; or, a portion of the wall surface of the second mounting part 1322 is attached to the connection hole 141, while the other portion of the wall surface is spaced apart, so that the second mounting part 1322 can smoothly pass through the connection hole 141 and limit the position of the composite diaphragm 14.

[0061] It is understandable that, due to the large size of the composite diaphragm 14, by providing the second mounting part 1322 through the connecting hole 141, the second mounting part 1322 can be configured to stretch and expand the composite diaphragm 14 outward, so that the composite diaphragm 14 can have good flatness, prevent the composite diaphragm 14 from wrinkling, and thus ensure that the composite diaphragm 14 has good atomization and brightening effects.

[0062] In some embodiments, the second mounting portion 1322 extends in a direction perpendicular to the surface of the composite diaphragm 14, so that the second mounting portion 1322 can directly enter the connecting hole 141 in a direction perpendicular to the surface of the composite diaphragm 14, which facilitates the installation of the composite diaphragm 14 and the second mounting portion 1322. The second mounting portion 1322 can also meet the requirement of flattening the composite diaphragm 14, effectively improving the assembly efficiency.

[0063] In some embodiments, referring to FIG2, the first mounting portion 1321 extends in a direction parallel to the surface of the composite diaphragm 14. During installation, the first mounting portion 1321 is parallel to the composite diaphragm 14 to prevent the first mounting portion 1321 from interfering with the composite diaphragm 14, so that the composite diaphragm 14 can better maintain its flatness.

[0064] In some embodiments, since the first mounting portion 1321 is parallel to the composite diaphragm 14 and the second mounting portion 1322 is perpendicular to the composite diaphragm 14, the second mounting portion 1322 is perpendicular to the first mounting portion 1321, thereby enhancing the structural stability of the connecting bracket 13 and facilitating the installation of the composite diaphragm 14. Furthermore, as shown in FIG2, the mounting base 131 and the composite diaphragm 14 are spaced apart, thereby reducing interference between the mounting base 131 and the composite diaphragm 14. The installation process of the composite diaphragm 14 is also more flexible, facilitating adjustment and calibration of the position between the composite diaphragm 14 and the second mounting portion 1322.

[0065] Referring to Figures 2 and 3, the backlight module 1 also includes a first adhesive layer 1323. The first adhesive layer 1323 is located on the side of the second mounting portion 1322 facing the connecting seat 132, and is disposed between the composite diaphragm 14 and the first mounting portion 1321, respectively bonded to both. To further stabilize the installation effect of the composite diaphragm 14, the first adhesive layer 1323 is configured to bond the composite diaphragm 14 and the first mounting portion 1321, reducing displacement of the composite diaphragm 14 during installation, transportation, and use, thereby effectively reducing the possibility of the composite diaphragm 14 falling off and ensuring its reliability during long-term use. Simultaneously, the first adhesive layer 1323 also ensures the fixation effect of the composite diaphragm 14, allowing it to maintain installation stability even when subjected to external vibration or impact.

[0066] Referring to Figures 2 and 3, in some embodiments, the mounting base 131 includes a first plate 1311 and a second plate 1312. The second plate 1312 is connected between the first mounting portion 1321 and the first plate 1311. The first plate 1311 extends in a direction parallel to the surface of the composite diaphragm 14, and its surface is in contact with the surface of the back plate 11, which can effectively improve the installation stability of the first plate 1311 mounted on the back plate 11, so as to provide a stable support foundation for the second plate 1312 and the connecting base 132. The second plate 1312 connects the first plate 1311 and the first mounting portion 1321. The size of the second plate 1312 in the direction perpendicular to the surface of the composite diaphragm 14 can be selected. The second plate 1312 extends in a direction perpendicular to the surface of the composite diaphragm 14 to reduce interference between the second plate 1312 and other structures.

[0067] Referring to Figure 4, the composite film 14 has a long side X and a wide side Y, and the number of connecting brackets 13 is set to multiple; wherein some of the connecting brackets 13 are arranged at intervals along the long side X of the composite film 14 and connected to the edge of the composite film 14; and / or, wherein some of the connecting brackets 13 are arranged at intervals along the wide side Y of the composite film 14 and connected to the edge of the composite film 14. In some embodiments, the composite film 14 is rectangular, which can be configured to adapt to most display screens, realizing the versatility of the backlight module 1.

[0068] Understandably, the support of multiple connecting brackets 13 creates a multi-point support effect, effectively reducing deformation of the composite film 14 during use, thus maintaining the flatness of the composite film 14 and reducing problems such as uneven display or image distortion caused by deformation of the composite film 14. Furthermore, multiple connecting brackets 13 provide multiple fixing points for the composite film 14, ensuring a tighter connection between the composite film 14 and the backplate 11, achieving uniform fixation of the composite film 14 throughout the entire backlight display module, reducing local stress concentration, and increasing the actual service life of the composite film 14. For example, when the composite film 14 is rectangular, multiple connecting brackets 13 are spaced apart at the two edges corresponding to the long side X of the composite film 14, and multiple connecting brackets 13 are spaced apart at the two edges corresponding to the wide side Y of the composite film 14. These multiple connecting brackets 13 support all four edge areas of the composite film 14, flattening the composite film 14 and achieving a good limiting effect.

[0069] Figures 5-7 show a schematic diagram of the structure of a composite film 14 according to an embodiment of this application. The composite film 14 includes a first optical film 100, which includes a first substrate 110, a first optical layer 120, and a microstructure layer 130. The microstructure layer 130 is connected to the first surface of the first substrate 110 (the surface facing away from the light-emitting element 12), and the first optical layer 120 is connected to the second surface of the first substrate 110 (the surface facing the light-emitting element 12).

[0070] The microstructure layer 130 includes multiple microprisms that enhance light intensity, as shown in Figure 2. Each microprism has an angle α, meaning it has at least two optical surfaces facing away from the first substrate 110. Adjacent optical surfaces are connected at an angle, and the angle between two adjacent surfaces is the angle α of the microprism. The angle α is 85° ≤ α ≤ 105°. For example, α can be 85°, 90°, 95°, 100°, 105°, or any range thereof. For instance, when the microprism is a strip prism with two optical surfaces, the angle is the angle between the two optical surfaces. When the microprism is a cone prism with three optical surfaces, the smallest angle between two adjacent optical surfaces is the angle of the microprism.

[0071] The microprisms include right-angle prisms, trapezoidal prisms, triangular prisms, hemispherical prisms, conical prisms, and composite prisms. Different microprism structures can be selected according to actual needs in this application, and no restrictions are imposed here.

[0072] The first optical layer 120 includes a uniformly mixed first optical adhesive 121 and diffusing particles 122. The diffusing particles 122 include a first refractive material and a reflective material. Based on the total weight of the first optical adhesive 121, the weight percentage of the diffusing particles 122 is A, the weight percentage of the first refractive material is a1, and the weight percentage of the reflective material is a2. Among these, 10.5 wt.% ≤ A ≤ 22.0 wt.%, and 0.4 ≤ a1 / a2 ≤ 2.0. For example, A can be 10.5 wt.%, 13.4 wt.%, 15.5 wt.%, 18.0 wt.%, 22.0 wt.%, or any range of the above. a1 / a2 can be 0.6, 0.7, 0.9, 1.2, 1.4, or any range of the above.

[0073] In this embodiment, the first optical film 100 of the composite film 14 includes a first optical layer 120 and a microstructure layer 130. The first optical adhesive 121 of the first optical layer 120 allows light to pass through, the first refractive material of the first optical layer 120 scatters light, and the reflective material of the first optical layer 120 reflects light. By selecting the weight percentage a1 of the first refractive material and the weight percentage a2 of the reflective material to satisfy 0.4 ≤ a1 / a2 ≤ 2.0, the first refractive material and the reflective material can be combined, achieving a light-fogging effect in the first optical adhesive 121. Furthermore, by selecting the diffusing particles 122... The weight percentage A satisfies 10.5 wt.% ≤ A ≤ 22.0 wt.%, and the amount of diffuser particles 122 is appropriate, resulting in more angles of light after the diffuser particles 122 change direction, and a better uniform light atomization effect. Furthermore, the microstructure layer 130 is selected to have multiple microprisms, with the edge angle α of the microprisms satisfying 85° ≤ α ≤ 105°. The microstructure layer 130 can cooperate in receiving light passing through the first optical layer 120, maintaining the atomization effect of the first optical layer 120 while also allowing total internal reflection of light with an angle greater than total internal reflection, allowing only small-angle light to refract and pass through, thereby achieving a brightening effect. Therefore, the composite film 14 of this embodiment can both atomize and brighten light, replacing the diffuser plate and optical film in related technologies and should be installed in the backlight module, simplifying the structure of the backlight module, simplifying the assembly process, saving material usage, and reducing the space occupied by the backlight module. When A exceeds the upper limit of 22.0 wt.%, the amount of diffusing particles 122 is excessive, resulting in a high particle density and a multi-layered diffusion structure. Light has already undergone multiple refractions or total internal reflections, and the atomization effect is not further improved. When A is below the lower limit of 10.5 wt.%, the amount of diffusing particles 122 is insufficient, resulting in a low particle density that is difficult to meet the requirements for atomization and brightness enhancement. When a1 / a2 exceeds the upper limit of 1.4, the content of the first refractive material is excessive, resulting in a better atomization effect, but easily leading to insufficient brightness of light transmitted through the composite film 14. When a1 / a2 is below the lower limit of 0.6, the content of reflective material is excessive, resulting in poor atomization of light and easily causing light and shadow effects.

[0074] In some embodiments, 4.0 wt.% ≤ a1 ≤ 10.0 wt.%, for example, a1 can be 4.0 wt.%, 5.3 wt.%, 6.5 wt.%, 8.5 wt.%, 10.0 wt.%, or any range thereof. Within the above range, the amount of the first refractive material is appropriate and has a good scattering effect on light, so as to cooperate with the reflective material to enhance the atomization effect on light.

[0075] In some embodiments, the first refractive material includes at least one of polymethyl methacrylate (PMMA), butyl 2-methyl-2-acrylate (PBMA), polycarbonate (PC), polystyrene (PS), and polypropylene (PP). The above materials are usually present in the form of spherical particles with uniform particle size. The above materials also have good light refraction effect, enabling the first refractive material to effectively scatter light and appear transparent or translucent without affecting the color of the underlying material. At the same time, they also have good heat resistance and can remain stable in high-temperature environments.

[0076] In some embodiments, 4.0 wt.% ≤ a2 ≤ 13.0 wt.%, for example, a2 can be 4.0 wt.%, 6.5 wt.%, 8.8 wt.%, 10.0 wt.%, 13.0 wt.%, or any range thereof. Within the above range, the amount of reflective material is appropriate, and it has a good reflective effect on light, so that the amount and angle of light emitted from the first optical layer 120 are appropriate, thereby improving the atomization effect.

[0077] In some embodiments, the reflective material includes at least one of TiO2 and SiO2. TiO2 has a high refractive index and typically exists as spherical or near-spherical particles. The uneven surface structure of TiO2 particles can also scatter light, thus TiO2 can effectively scatter light and produce a uniform light scattering effect. Furthermore, TiO2 is white, possessing excellent hiding power and whiteness, and also exhibits good lightfastness, not easily fading from prolonged exposure to sunlight. SiO2 has a low refractive index and typically exists as spherical or near-spherical particles. The uniform size and shape of SiO2 particles enable it to effectively scatter light. SiO2 is transparent or translucent and does not affect the color of the underlying material. SiO2 also has good heat resistance and remains stable at high temperatures.

[0078] In some embodiments, the particle size of the first refractive material is r1, where 1 μm ≤ r1 ≤ 50 μm. For example, r1 can be 1 μm, 4 μm, 8 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, or any range thereof. Within the above range, the first refractive material can effectively scatter light, optimize the atomization effect, and simultaneously allow the first refractive material to be uniformly mixed in the first optical adhesive 121.

[0079] In some embodiments, the particle size of the reflective material is r2, where 0.1 μm ≤ r2 ≤ 20 μm. For example, r2 can be 0.1 μm, 0.6 μm, 1 μm, 2 μm, 6 μm, 10 μm, 14 μm, 20 μm, or any range thereof. Within the above range, the reflective material can effectively reflect light, optimize the fogging effect, and has low light loss, which helps to improve the incremental effect, while also allowing the reflective material to be uniformly mixed in the first optical adhesive 121.

[0080] In some embodiments, the thickness of the first optical layer 120 is m1, where 5μm ≤ m1 ≤ 15μm. For example, m1 can be 5μm, 6μm, 7μm, 8μm, 10μm, 12μm, 15μm, or any range thereof. Within the above range, the first refractive material and the reflective material can be uniformly dispersed in the first optical adhesive 121, ensuring a suitable optical path for the light entering the first optical layer 120, thereby improving the fogging effect and providing a good brightening effect.

[0081] In some embodiments, a first refractive material and a reflective material may be added to a liquid first optical adhesive 121, mixed evenly, and then uniformly coated onto the surface of a first substrate 110. After the first optical adhesive 121 has cured, a first optical layer 120 is formed.

[0082] In some embodiments, the thickness of the first substrate 110 is m2, where 100μm ≤ m2 ≤ 300μm. For example, m2 can be 100μm, 130μm, 160μm, 180μm, 220μm, 250μm, 300μm, or any range thereof. Within the above range, the first substrate 110 can provide good support for the first optical layer 120 and the microstructure layer 130, preventing the first optical layer 120 and the microstructure layer 130 from deforming and breaking due to bending deformation of the first substrate 110, and enabling the first optical layer 120 and the microstructure layer 130 to be stably attached to the surface of the first substrate 110, facilitating processing.

[0083] In some embodiments, the material of the first substrate 110 includes at least one of polycarbonate, polyethylene terephthalate, polystyrene, polyethylene, and polymethyl methacrylate. Using the above materials, the first substrate 110 has good light transmittance and low light deflection.

[0084] In some embodiments, the microstructure layer 130 covers the first surface (the surface facing away from the light source) of the first substrate 110, so that all light passing through the first substrate 110 can reach the microstructure layer 130.

[0085] In some embodiments, the edge spacing between two adjacent microprisms of the microstructure layer 130 is L1, where 110 μm ≤ L1 ≤ 300 μm. For example, L1 can be 110 μm, 150 μm, 180 μm, 200 μm, 240 μm, 300 μm, or any range thereof. Within this range, the optical path and angle of light propagation between the multiple microprisms are appropriate, thereby optimizing the brightening effect.

[0086] In some embodiments, the thickness of the microstructure layer 130 is g, where 30 μm ≤ g ≤ 70 μm. For example, g can be 30 μm, 33 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, or any range thereof. Within this range, the optical path of light entering the microstructure layer 130 is appropriate, thereby improving the fogging and brightening effects, and the microstructure layer 130 has good structural strength and is not easily broken.

[0087] In some embodiments, the height of the microprism is h, where 5μm ≤ h ≤ 50μm. For example, h can be 5μm, 8μm, 10μm, 15μm, 20μm, 30μm, 50μm, or any range thereof. The microstructure layer 130 in this embodiment can be formed by spraying 5μm to 50μm steel grit or quartz sand onto the surface of a roller mold to create a pitted structure. An optical adhesive layer is then applied to the surface of the first substrate 110, and the optical adhesive is rolled onto the pitted roller mold. After UV curing, the microstructure layer 130 with microprisms is formed. By selecting the height of the microprism within the above range, the microstructure layer 130 can improve the fogging and brightening effects while also ensuring the microprisms have a suitable sharpness for bonding with other structures and preventing easy breakage. In this embodiment, the shape of the steel grit or quartz sand sprayed onto the surface of the roller mold can be used to prepare a microprism with the desired angle α.

[0088] In some embodiments, the material of the microstructure layer 130 includes a UV adhesive.

[0089] In some embodiments, the composite film 14 further includes a diffusion film 200 disposed on one side of the first surface of the first optical film 100. The diffusion film 200 can further atomize the light passing through the microstructure layer 130 and further improve the uniformity of the light passing through the composite film 14.

[0090] As shown in Figure 6, the diffusion film 200 includes a second substrate 210 and a second optical layer 220. The second optical layer 220 is connected to the surface of the second substrate 210 facing away from the first optical film 100. The second optical layer 220 includes a second optical adhesive 221 and a second refractive material 222. Based on the total weight of the second optical adhesive 221, the weight percentage of the second refractive material 222 is a3, where 3wt.%≤a3≤10wt.%. The second refractive material 222 further scatters the light, allowing the first optical film 100 and the diffusion film 200 to work together to achieve better light atomization and brightening effects.

[0091] In some embodiments, the particle size of the second refractive material 222 is r3, where 1 μm ≤ r3 ≤ 50 μm, so that the second refractive material 222 can be uniformly dispersed in the second optical adhesive 221. The second refractive material 222 includes at least one of polymethyl methacrylate (PMMA), butyl 2-methyl-2-acrylate (PBMA), polycarbonate (PC), polystyrene (PS), and polypropylene (PP).

[0092] In some embodiments, the thickness of the second optical layer 220 is n1, where 13μm≤n1≤19μm, so that the optical path of the light entering the second optical layer 220 is appropriate, thereby improving the atomization effect and the brightening effect.

[0093] In some embodiments, the second refractive material 222 can be added to the liquid second optical adhesive 221, mixed evenly, and then uniformly coated onto the surface of the second substrate 210. After the second optical adhesive 221 cures, a second optical layer 220 is formed. The first optical adhesive 121 and the second optical adhesive 221 can be optical adhesives with the same refractive index.

[0094] In some embodiments, the thickness of the second substrate 210 is n2, where 100μm≤n2≤300μm. The material of the second substrate 210 includes at least one of polycarbonate, polyethylene terephthalate, polystyrene, polyethylene, and polymethyl methacrylate. Using the above materials, the first substrate 110 has good light transmittance and minimal light deflection.

[0095] In some embodiments, as shown in FIG5, the first optical film 100 and the diffusion film 200 are integrally disposed. For example, an adhesive material 400 is provided between the layers of the first optical film 100 and the diffusion film 200 to bond the first optical film 100 and the diffusion film 200 together to form a composite film 14. In some embodiments, as shown in FIGS. 3 to 6, the composite film 14 further includes a brightness enhancement layer 300, which is connected between the first optical film 100 and the diffusion film 200, and the first optical film 100, the brightness enhancement layer 300, and the diffusion film 200 are integrally disposed. For example, an adhesive material 400 is provided between the layers of the first optical film 100, the brightness enhancement layer 300, and the diffusion film 200 to bond the first optical film 100, the brightness enhancement layer 300, and the diffusion film 200 together to form a composite film 14. The adhesive material 400 between any two adjacent layers of the first optical film 100, the brightness enhancement layer 300 and the diffusion film 200 of the composite film 14 can be a liquid optical adhesive filled in the gap between the layers. After the liquid optical adhesive is cured, the various layers of the composite film 14 are cured into one piece to form the composite film 14, so that it can be assembled into the backlight module 1.

[0096] Optionally, as shown in FIG6, the brightness enhancement layer 300 includes a 0° brightness enhancement film; or, the brightness enhancement layer 300 includes a 90° brightness enhancement film; or, as shown in FIG7, the brightness enhancement layer 300 includes a first brightness enhancement film 310 and a second brightness enhancement film 320 stacked together, the first brightness enhancement film 310 having a first prism and the second brightness enhancement film 320 having a second prism, the angle difference between the first prism and the second prism being 90°, and the one with the larger angle of the first brightness enhancement film 310 and the second brightness enhancement film 320 being placed on the side of the other facing the diffusion film 200, so as to achieve the purpose of brightening.

[0097] When the brightness enhancement layer 300 includes a first brightness enhancement film 310 and a second brightness enhancement film 320, optionally, as shown in FIG7, the first prism of the first brightness enhancement film 310 has an angle of 0°, that is, the first brightness enhancement film 310 is a 0° brightness enhancement film, and the second prism of the second brightness enhancement film 320 has an angle of 90°, that is, the second brightness enhancement film 320 is a 90° brightness enhancement film; or, the first prism of the first brightness enhancement film 310 has an angle of 8°, and the second prism of the second brightness enhancement film 320 has an angle of 98°; or, the first prism of the first brightness enhancement film 310 has an angle of 45°, and the second prism of the second brightness enhancement film 320 has an angle of 135°.

[0098] Secondly, referring to Figures 8 and 9, this application embodiment provides a display device 1000, including the aforementioned backlight module 1. The backlight module 1 includes a backplate 11, a light-emitting element 12, a connecting bracket 13, a composite film 14, and supporting foam 15. In addition, the display device 1000 also includes a display module 2, which includes a liquid crystal display screen 21. The liquid crystal display screen 21 is stacked on the side of the composite film 14 opposite to the light-emitting element 12. The light emitted by the light-emitting element 12 is atomized and brightened by the composite film 14 before propagating to the liquid crystal display screen 21, providing a good backlight effect for the liquid crystal display screen 21.

[0099] The display device 1000 in this application embodiment includes a backlight module 1. The structure of the backlight module 1 is the same as that in the above embodiments. Since the display device 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0100] Thirdly, this application embodiment also provides a display device 1000, including a display module 2 and the aforementioned backlight module 1. Furthermore, referring to Figures 8 and 9, the display device 1000 also includes a frame 4, with a connecting bracket 13 connected to the frame 4. The frame 4 is connected to a back plate 11, allowing the connecting bracket 13 to be mounted on the back plate 11 via the frame 4. The frame 4 includes a main body 41 and an extension 42. The main body 41 is disposed on the outer periphery of the cover plate 3, and the extension 42 extends along the edge of the top surface of the cover plate 3. The connecting bracket 13 is connected to the main body 41, and the edge of the cover plate 3 is disposed between the extension 42 and the connecting bracket 13. The extension 42 and the connecting bracket 13 together fix the cover plate 3. The cover plate 3 is located on the side of the liquid crystal display screen 21 opposite to the composite film 14, and the surface of the cover plate 3 is in contact with the surface of the connecting bracket 13.

[0101] Understandably, in related technologies, the backlight module 1 uses a combination of a diffuser plate and an optical film to process the light emitted by the light-emitting element 12. The display device 1000 in this application eliminates the original diffuser plate and its corresponding mounting structure. The light emitted by the light-emitting element 12 is atomized and brightened by the composite film 14 before being transmitted to the liquid crystal display screen 21. The cover plate 3 is used to protect the display module 2, and the connecting bracket 13 provides support for the cover plate 3.

[0102] In one embodiment, the top surface of the cover plate 3 is a side facing away from the liquid crystal display screen 21, the edge portion of the cover plate 3 is a peripheral side facing away from the center position, and the extension portion 42 extends to the edge of the cover plate 3 to achieve the effect of fixing and installing the cover plate 3. It can be understood that, referring to Figures 8 to 9, the extension portion 42 and the connecting bracket 13 clamp the cover plate 3 in the vertical direction.

[0103] A connecting bracket 13 is mounted on a frame 4, and the frame 4 is mounted on a back plate 11, so that the connecting bracket 13 is mounted on the back plate 11 through the frame 4. In this embodiment, the edges of the frame 4 and the back plate 11 are connected, a portion of the connecting bracket 13 is fixedly mounted on the frame 4, and the other portion is connected to the composite diaphragm 14. It is understood that the edge of the back plate 11 has a protrusion along the direction close to the frame 4, and the side of the frame 4 close to the back plate 11 has a recess, so that the frame 4 and the back plate 11 are inserted into each other, and screw holes and screw fasteners are respectively provided between the frame 4 and the back plate 11 for fixing.

[0104] The connecting bracket 13 includes a mounting base 131 and a connecting base 132. The mounting base 131 is connected to the frame 4. The connecting base 132 includes a first mounting part 1321 and a second mounting part 1322. The second mounting part 1322 and the mounting base 131 are located on the same side of the first mounting part 1321 and are respectively connected to the first mounting part 1321. The composite diaphragm 14 is installed on the second mounting part 1322. The edge portion of the cover plate 3 is disposed between the extension part 42 and the first mounting part 1321. The extension part 42 and the first mounting part 1321 together fix the cover plate 3. This allows the connecting bracket 13 to simultaneously accommodate the installation of the cover plate 3 and the composite diaphragm 14. The connecting bracket 13 has a simple structure and does not require additional related structures to separately install the cover plate 3 and the composite diaphragm 14, thus simplifying the installation process.

[0105] Furthermore, to ensure the fixation effect between the connecting bracket 13 and the frame 4, the mounting base 131 has a mounting hole 1311a, and the frame 4 is provided with a mating groove 41 corresponding to the mounting hole 1311a. The display device 1000 also includes a locking member 5 disposed in the mounting hole 1311a and the mating groove 41 to connect the mounting base 131 and the frame 4. The locking member 5 includes a threaded connector, which can provide a stable connection effect, improve the installation stability between the mounting base 131 and the frame 4, reduce the phenomenon of displacement of the mounting base 131 during use, and further optimize the display effect. In some other embodiments, the mounting base 131 and the frame 4 can also be fixed by means of insertion connection, snap-fit ​​connection, etc., which are not limited in this application.

[0106] Fourthly, this application provides a touch display device, including the backlight module 1 or the display device 1000 described above. The touch display device also includes a touch component, which is configured to detect the state of an external object (such as a finger or stylus) approaching the display module 2 to realize touch operation, thereby enabling more intuitive human-computer interaction.

[0107] The touch display device provided in this application embodiment can be a smart interactive flat panel, a conference flat panel, a smart blackboard / whiteboard, etc.

[0108] When the touch display device includes the backlight module 1, the structure of the backlight module 1 is as described in the above embodiment. When the touch display device includes the display device 1000, the structure of the display device 1000 is as described in the above embodiment. Since the touch display device 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0109] In some embodiments, referring to FIG10, the touch component can be an infrared touch component, which includes an infrared touch module 7. The infrared touch module 7 is configured such that the portion of the infrared light receiving and receiving light extends out of the cover plate 3 and faces away from the surface of the liquid crystal display screen 21. The infrared touch module 7 detects the position of external objects (such as fingers or styluses) by emitting and receiving infrared light to realize touch operation. Since the infrared touch module 7 does not rely on physical contact with the screen surface, it reduces wear and scratches on the screen surface. In addition, infrared sensors usually have a long service life and low maintenance costs, which can effectively control the cost of touch display devices. When the touch component includes an infrared touch module 7, the main body 41 and the extension 42 of the frame 4 enclose a receiving cavity 43 and a light-transmitting port 44 communicating with the receiving cavity. The light-transmitting port 44 is located on the side of the cover plate away from the light-emitting element. The infrared touch module 7 is disposed within the receiving cavity. The infrared touch module 7 includes a transmitter and a receiver. The transmitter has a transmitting end that emits infrared light, and the receiver has a receiving end that receives infrared light. The transmitting end and the receiving end are respectively positioned facing the corresponding light-transmitting port 44, so that the infrared light emitted by the transmitter can pass through the light-transmitting port 44 and be received by the receiving end of the receiver, forming a touch network. A light filter 8 is installed at the light-transmitting port 44, and the light filter 8 is configured to filter out stray light other than infrared light.

[0110] In other embodiments, referring to FIG8, the touch component can be a capacitive touch component, which includes a capacitive touch film 6; the capacitive touch film 6 is disposed between the liquid crystal display screen 21 and the cover plate 3; or, the capacitive touch film 6 is disposed between the liquid crystal display screen 21 and the composite film 14. It is understood that the capacitive touch film 6 can provide higher touch sensitivity and response speed, support multi-touch, allow multiple fingers to operate simultaneously, and realize complex gestures such as zooming and rotating. Furthermore, the capacitive touch film 6 being located between the liquid crystal display screen 21 and the composite film 14 can reduce the overall thickness, making the device thinner and lighter, suitable for touch display devices with strict thickness requirements.

[0111] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A backlight module, arranged as a display device, wherein, The backlight module includes a back plate, a light-emitting element, a connecting bracket, a composite film, and supporting foam, wherein the light-emitting element is mounted on the back plate and is configured to emit light. The composite film is disposed on the light-emitting side of the light-emitting element and spaced apart from the back plate. The composite film is configured to receive the light emitted by the light-emitting element and to atomize and brighten the light emitted by the light-emitting element to form a surface light source. The connecting bracket is disposed on the outer periphery of the composite membrane and connected to the back plate. The connecting bracket is configured to connect the edge portion of the composite membrane to stretch the composite membrane outward and make the composite membrane straight. The supporting foam is disposed between the back plate and the composite membrane. One end of the supporting foam abuts against the composite membrane to support the composite membrane, and the other end of the supporting foam abuts against the back plate.

2. The backlight module of claim 1, wherein, The connecting bracket includes: Mounting base, connected to the back plate; The connector includes a first mounting part and a second mounting part, the second mounting part and the connector are located on the same side of the first mounting part and are respectively connected to the first mounting part, and the composite diaphragm is mounted on the second mounting part.

3. The backlight module of claim 2, wherein, The edge portion of the composite diaphragm has a connection hole, the second mounting portion passes through the connection hole, and the second mounting portion is in contact with at least a portion of the wall surface of the connection hole to stretch the composite diaphragm outward.

4. The backlight module of claim 2, wherein, The second mounting portion extends in a direction perpendicular to the surface of the composite diaphragm; and / or, The first mounting portion extends in a direction parallel to the surface of the composite diaphragm.

5. The backlight module of claim 2, wherein, The backlight module further includes a first adhesive layer, which is disposed between the composite film and the first mounting portion, and is respectively bonded to the composite film and the first mounting portion.

6. The backlight module of claim 2, wherein, The mounting base includes a first plate and a second plate, the second plate being connected between the first mounting part and the first plate, the first plate extending in a direction parallel to the surface of the composite film, and the surface of the first plate being in contact with the surface of the back plate.

7. The backlight module of claim 2, wherein, The composite diaphragm is a rectangular diaphragm with a long side and a wide side, and the number of connecting brackets is multiple; Some of the connecting brackets are arranged at intervals along the long side of the composite diaphragm and connected to the edge portion of the composite diaphragm; and / or, Some of the connecting brackets are arranged at intervals along the wide side of the composite membrane and are connected to the edge portion of the composite membrane.

8. The backlight module of claim 2, wherein, The composite film includes a first optical film, a brightness enhancement layer, and a diffusion film stacked sequentially. The first optical film includes a first substrate, a first optical layer, and a microstructure layer. The microstructure layer is connected to a first surface of the first substrate, and the first optical layer is connected to a second surface of the first substrate. The diffusion film includes a second substrate and a second optical layer, wherein the second optical layer is connected to the surface of the second substrate facing away from the first optical film; The brightness enhancement layer includes a first brightness enhancement film and a second brightness enhancement film stacked together. The first brightness enhancement film has a first prism, and the second brightness enhancement film has a second prism. The angle difference between the first prism and the second prism is 90°.

9. The backlight module of claim 8, wherein, The first optical layer comprises a uniformly mixed first optical adhesive and diffusing particles, wherein the diffusing particles comprise a first refractive material and a reflective material; based on the total weight of the first optical adhesive, the weight percentage of the diffusing particles is A, the weight percentage of the first refractive material is a1, and the weight percentage of the reflective material is a2, wherein 10.5 wt.% ≤ A ≤ 22.0 wt.%, and 0.4 ≤ a1 / a2 ≤ 2.

0.

10. The backlight module of claim 9, wherein, The first optical layer satisfies at least one of the following conditions: (1)18.0wt.%≤A≤22.0wt.%; (2)4.0wt.%≤a1≤10.0wt.%; (3)4.0wt.%≤a2≤13.0wt.%.

11. The backlight module of claim 9, wherein, The first optical film satisfies at least one of the following conditions: (1) The particle size of the first refractive material is r1, 1μm≤r1≤50μm; (2) The particle size of the reflective material is r2, 0.1μm≤r2≤20μm; (4) The thickness of the first optical layer is m1, 5μm≤m1≤15μm; (5) The thickness of the first substrate is m2, 100μm≤m2≤300μm.

12. The backlight module of claim 9, wherein, The reflective material includes at least one of TiO2 and SiO2; The first refractive material includes at least one of polymethyl methacrylate, butyl 2-methyl-2-acrylate monomer, polycarbonate, polystyrene, and polypropylene; The material of the first substrate includes at least one of polycarbonate, polyethylene terephthalate, polystyrene, polyethylene, and polymethyl methacrylate; The material of the microstructure layer includes UV adhesive.

13. The backlight module of claim 8, wherein, The microstructure layer includes multiple microprisms that deflect light, and the angle of the microprisms is α, where 85°≤α≤105°.

14. The backlight module of claim 13, wherein, The microstructure layer satisfies at least one of the following conditions: (1) The edge spacing between two adjacent microprisms of the microstructure layer is L1, 110μm≤L1≤300μm; (2) The thickness of the microstructure layer is g, where 30μm≤g≤70μm; (3) The height of the microprism is h, 5μm≤h≤50μm; (3) The microstructure layer covers the first surface.

15. The backlight module of claim 8, wherein, The second optical layer includes a second optical adhesive and a second refractive material. Based on the total weight of the second optical adhesive, the weight percentage of the second refractive material is a3, where 3wt.% ≤ a3 ≤ 10wt.%.

16. The backlight module of claim 15, wherein, The diffusion membrane satisfies at least one of the following conditions: (1) The particle size of the second refractive material is r3, 1μm≤r3≤50μm (2) The thickness of the second optical layer is n1, 13μm≤n1≤19μm; (3) The thickness of the second substrate is n2, 100μm≤n2≤300μm.

17. A display device, wherein, This includes the display module and the backlight module; The backlight module includes a back plate, a light-emitting element, a connecting bracket, a composite film, and supporting foam, wherein the light-emitting element is mounted on the back plate and is configured to emit light. The composite film is disposed on the light-emitting side of the light-emitting element and spaced apart from the back plate. The composite film is configured to receive the light emitted by the light-emitting element and to atomize and brighten the light emitted by the light-emitting element to form a surface light source. The connecting bracket is disposed on the outer periphery of the composite membrane and connected to the back plate. The connecting bracket is configured to connect the edge portion of the composite membrane to stretch the composite membrane outward and make the composite membrane straight. The supporting foam is disposed between the back plate and the composite membrane. One end of the supporting foam abuts against the composite membrane to support the composite membrane, and the other end of the supporting foam abuts against the back plate. The display module includes a liquid crystal display screen, which is stacked on the side of the composite film opposite to the light-emitting element.

18. A display device, wherein, This includes the display module and the backlight module; The backlight module includes a back plate, a light-emitting element, a connecting bracket, a composite film, and supporting foam, wherein the light-emitting element is mounted on the back plate and is configured to emit light. The composite film is disposed on the light-emitting side of the light-emitting element and spaced apart from the back plate. The composite film is configured to receive the light emitted by the light-emitting element and to atomize and brighten the light emitted by the light-emitting element to form a surface light source. The connecting bracket is disposed on the outer periphery of the composite membrane and connected to the back plate. The connecting bracket is configured to connect the edge portion of the composite membrane to stretch the composite membrane outward and make the composite membrane straight. The supporting foam is disposed between the back plate and the composite membrane. One end of the supporting foam abuts against the composite membrane to support the composite membrane, and the other end of the supporting foam abuts against the back plate. The display module includes a liquid crystal display screen, which is stacked on the side of the composite film away from the light-emitting element. The display device also includes a cover plate and a frame, and the connecting bracket is connected to the frame. The frame is connected to the back plate so that the connecting bracket is connected to the back plate through the frame. The frame includes a main body and an extension. The main body is disposed on the outer periphery of the cover plate, and the extension extends along the top surface of the edge portion of the cover plate. The connecting bracket is connected to the main body, and the edge portion of the cover plate is disposed between the extension and the connecting bracket. The extension and the connecting bracket together fix the cover plate.

19. The display device as claimed in claim 18, wherein, The connecting bracket includes: Mounting base, connected to the back plate; The connector includes a first mounting part and a second mounting part, wherein the second mounting part and the connector are located on the same side of the first mounting part and are respectively connected to the first mounting part, and the composite diaphragm is mounted on the second mounting part; The mounting base is connected to the frame; the edge portion of the cover plate is disposed between the extension and the first mounting portion, and the extension and the first mounting portion together fix the cover plate.

20. A touch display device, wherein, Including touch components; Backlight module; or, Display devices; The backlight module includes a back plate, a light-emitting element, a connecting bracket, a composite film, and supporting foam, wherein the light-emitting element is mounted on the back plate and is configured to emit light. The composite film is disposed on the light-emitting side of the light-emitting element and spaced apart from the back plate. The composite film is configured to receive the light emitted by the light-emitting element and to atomize and brighten the light emitted by the light-emitting element to form a surface light source. The connecting bracket is disposed on the outer periphery of the composite membrane and connected to the back plate. The connecting bracket is configured to connect the edge portion of the composite membrane to stretch the composite membrane outward and make the composite membrane straight. The supporting foam is disposed between the back plate and the composite membrane. One end of the supporting foam abuts against the composite membrane to support the composite membrane, and the other end of the supporting foam abuts against the back plate. The display device includes a display module and the backlight module. The display module includes a liquid crystal display screen, which is stacked on the side of the composite film opposite to the light-emitting element.

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