Backlight module and display device

Abstract

The present application provides a backlight module. The backlight module includes a middle frame, and the middle frame includes a first middle frame and a second middle frame. A plurality of hollow portions are formed on one side of the first middle frame facing away from the second middle frame, and an expansion assembly is disposed in the hollow portions. The backlight module further includes an elastic film, and the elastic film is disposed on one side of the first middle frame facing away from the second middle frame and covers the plurality of hollow portions. When the backlight module emits light, the heat generated by the light-emitting component of the backlight module is transferred to the plurality of expansion assemblies, and the plurality of expansion assemblies expand when heated. A part of each expansion assembly protrudes out of the hollow portion and abuts against the elastic film, so that a plurality of protrusions are formed on the elastic film to support the display panel. The plurality of protrusions on the elastic film enable the display panel to form point contacts with the backlight module. When the display panel is squeezed or pressed, the force is dispersed to the plurality of protrusions, and the liquid crystal molecules at the squeezed or pressed position will not move in the vertical direction, thereby avoiding light leakage of the display panel. The present application also provides a display device.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly to a backlight module and a display device having the backlight module. Background Art

[0002] In-Plane Switching (IPS) display panels have become the mainstream displays on the market currently. Compared with Vertical Alignment (VA) display panels, IPS display panels have the advantages of fast response, large viewing angle, accurate color, and environmental protection nodes.

[0003] The IPS display panel is disposed on the middle frame of the backlight module. Generally, a whole-plane contact type support rubber is disposed between the IPS display panel and the middle frame to achieve soft contact between the IPS display panel and the middle frame. Since the IPS display panel is in whole-plane contact with the support rubber, when the IPS display panel is squeezed or pressed, the liquid crystal molecules at the squeezed or pressed position move in the vertical direction due to the inability to disperse the force, affecting the light emission direction inside the IPS display panel, and thus resulting in light leakage of the IPS display panel.

[0004] Therefore, how to improve the contact mode between the middle frame and the IPS display panel to avoid light leakage of the IPS display panel is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above deficiencies of the prior art, the purpose of the present application is to provide a backlight module and a display device having the backlight module, aiming to solve the problem that when the IPS display panel in the prior art is squeezed or pressed, the force cannot be dispersed, resulting in light leakage of the IPS display panel.

[0006] To solve the above technical problems, an embodiment of the present application provides a backlight module. The backlight module includes a middle frame, and the middle frame includes a first middle frame and a second middle frame. The second middle frame is connected to the edge of the first middle frame. The feature is that a plurality of hollow parts are provided on the side of the first middle frame facing away from the second middle frame. An expansion component is disposed in each hollow part. The backlight module further includes an elastic film. The elastic film is disposed on the side of the first middle frame facing away from the second middle frame and covers the plurality of hollow parts. Wherein, the expansion component is used to receive the heat generated by the light-emitting component of the backlight module and expand when the backlight module emits light. A part of each expansion component extends out of the hollow part and abuts against the elastic film, so that a plurality of protrusions are formed on the elastic film to support the display panel.

[0007] In summary, when the backlight module provided by the embodiment of the present application emits light, multiple protrusions on the elastic film cause the display panel to form point contact with the backlight module. When the display panel is squeezed or pressed, the force is dispersed to multiple protrusions, and the liquid crystal molecules at the squeezed or pressed position will not move in the vertical direction, thereby avoiding light leakage of the display panel.

[0008] In an exemplary embodiment, the expansion assembly includes an expansion element. Among them, multiple expansion elements expand when heated, and one end of the expansion element facing the elastic film extends out of the hollow portion and abuts against the elastic film, so that multiple protrusions are formed on the elastic film to support the display panel.

[0009] In an exemplary embodiment, the surface of the expansion element facing the elastic film is an arc surface.

[0010] In an exemplary embodiment, the expansion assembly includes an expansion element and a holding element. The expansion element is located on the side of the holding element facing away from the elastic film, and the size of the holding element is larger than the opening of the hollow portion facing the elastic film. Among them, the expansion element expands when heated, and the expansion element pushes the holding element to move towards the elastic film. A part of the holding element extends out of the hollow portion and abuts against the elastic film, so that multiple protrusions are formed on the elastic film to support the display panel.

[0011] In an exemplary embodiment, the hollow portion does not penetrate the first middle frame. The expansion assembly includes a holding element, a flexible element and an expansion liquid. The expansion liquid is arranged at the bottom of the hollow portion. The flexible element is fixed in the hollow portion and seals the expansion liquid. The holding element is arranged on the side of the flexible element facing away from the expansion liquid, and the size of the holding element is larger than the opening of the hollow portion facing the elastic film. Among them, the volume of the expansion liquid increases when heated. The expansion liquid pushes the flexible element to bulge towards the holding element. The holding element moves towards the elastic film. A part of the holding element extends out of the hollow portion and abuts against the elastic film, so that multiple protrusions are formed on the elastic film to support the display panel.

[0012] In an exemplary embodiment, the hollow portion does not penetrate the first middle frame. The expansion assembly includes a resisting element, a flexible element, and a melting element. The melting element is disposed at the bottom of the hollow portion. The flexible element is fixed within the hollow portion and seals the melting element. The resisting element is disposed on a side of the flexible element facing away from the melting element, and a size of the resisting element is greater than an opening of the hollow portion facing the elastic film. Wherein, when the melting element is heated and melted into a liquid state and its volume increases, the liquid melting element pushes the flexible element to protrude towards the resisting element, the resisting element moves towards the elastic film, and a part of the resisting element extends out of the hollow portion and abuts against the elastic film, so that a plurality of the protrusions are formed on the elastic film to support the display panel.

[0013] In an exemplary embodiment, the interior of the resisting element is hollow, and a surface of the resisting element facing the elastic film is an arc surface.

[0014] In an exemplary embodiment, an inner diameter of at least a part of the hollow portion increases in a direction from the elastic film towards the first middle frame.

[0015] In an exemplary embodiment, the backlight module further includes a heat conducting element. The heat conducting element is disposed on a part of a surface of the first middle frame facing away from the elastic film and an inner side surface of the second middle frame, and the heat conducting element is used for heat conduction.

[0016] Based on the same inventive concept, an embodiment of the present application further provides a display device. The display device includes a display panel and the above-mentioned backlight module, and the display panel is disposed on a light-emitting side of the backlight module.

[0017] In summary, the display device provided by the embodiment of the present application includes a display panel and a backlight module. When the backlight module emits light, a plurality of protrusions on the elastic film cause the display panel and the backlight module to form point contacts. When the display panel is squeezed or pressed, the force is dispersed to the plurality of protrusions, and the liquid crystal molecules at the squeezed or pressed position do not move in the vertical direction, thereby avoiding light leakage of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of a layer structure of a display device disclosed in the first embodiment of the present application;

[0020] Figure 2 The top view structural schematic diagram of the backlight module when it is not emitting light according to the second embodiment of the present application;

[0021] Figure 3 is Figure 2 The cross-sectional schematic diagram of the backlight module shown along the III-III direction;

[0022] Figure 4 is Figure 2 The internal structural schematic diagram of the first middle frame of the backlight module shown;

[0023] Figure 5 The top view structural schematic diagram of the backlight module when it is emitting light according to the second embodiment of the present application;

[0024] Figure 6 is Figure 5 The internal structural schematic diagram of the first middle frame of the backlight module shown;

[0025] Figure 7 is Figure 2 Another internal structural schematic diagram of the first middle frame of the backlight module shown;

[0026] Figure 8 is Figure 2 The cross-sectional schematic diagram of the backlight module shown along the VIII-VIII direction;

[0027] Figure 9 The internal structural schematic diagram of the first middle frame of the backlight module when it is not emitting light according to the third embodiment of the present application;

[0028] Figure 10 The internal structural schematic diagram of the first middle frame of the backlight module when it is emitting light according to the third embodiment of the present application;

[0029] Figure 11 The internal structural schematic diagram of the first middle frame of the backlight module when it is not emitting light according to the fourth embodiment of the present application;

[0030] Figure 12 The internal structural schematic diagram of the first middle frame of the backlight module when it is emitting light according to the fourth embodiment of the present application;

[0031] Figure 13 The partial layer structural schematic diagram of the backlight module according to the fourth embodiment of the present application;

[0032] Figure 14 The internal structural schematic diagram of the first middle frame of the backlight module when it is not emitting light according to the fifth embodiment of the present application;

[0033] Figure 15 The internal structural schematic diagram of the first middle frame of the backlight module when it is emitting light according to the fifth embodiment of the present application.

[0034] Description of Reference Numerals of the Drawings:

[0035] 10 - Display panel; 30 - Backlight module; 31 - Middle frame; 32 - Elastic film; 32a - Protrusion; 33 - Expansion component; 34 - Backplate; 34a - Accommodating space; 35 - Light-emitting component; 36 - Heat-conducting element; 37 - Light guide plate;

[0036] 38 - Reflector; 39 - Optical film assembly; 100 - Display device; 301 - Accommodating hole; 302 - Accommodating groove;

[0037] 311 - First middle frame; 311a - Hollowed-out part; 311b - First sub-frame; 311c - Second sub-frame; 311d - Flexible film;

[0038] 312 - Second middle frame; 331 - Expansion element; 332 - Supporting element; 333 - Flexible element; 334 - Expansion liquid;

[0039] 335 - Melting element; 341 - Backplate main body; 342 - Side plate assembly. Detailed Embodiment

[0040] For the convenience of understanding the present application, the present application will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0041] The descriptions of the following embodiments refer to the attached drawings to illustrate specific embodiments in which the present application can be implemented. The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connection" and "coupling" used in the present application, unless otherwise specified, include both direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "up", "down", "front", "rear", "left", "right", "inside", "outside", "side", etc., are only references to the directions in the attached drawings. Therefore, the directional terms are used to better and more clearly illustrate and understand the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0042] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include", "may include", "comprise", or "may comprise" used in the present application indicate the presence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the term "include" or "comprise" means the presence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and does not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and is intended to cover non-exclusive inclusion. It should also be understood that the meaning of "at least one" described herein is one and more than one, such as one, two, or three, etc., and the meaning of "a plurality" is at least two, such as two or three, etc., unless otherwise clearly and specifically defined.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0044] Please refer to Figure 1 , Figure 1 is a schematic diagram of the layer structure of the display device disclosed in the first embodiment of the present application. In the embodiment of the present application, the display device 100 may include a display panel 10 and a backlight module 30. The display panel 10 is disposed on the light-emitting side of the backlight module 30, and the display panel 10 is configured to display an image under the backlight provided by the backlight module 30.

[0045] In the embodiment of the present application, the display panel 10 includes a color filter substrate, a liquid crystal layer, and an array substrate that are sequentially stacked. That is, the liquid crystal layer is located between the color filter substrate and the array substrate. The color filter substrate and the array substrate form a corresponding preset electric field according to an image signal. The preset electric field drives the liquid crystal molecules in the liquid crystal layer to deflect to change the transmittance of the liquid crystal layer, so that the display panel 10 displays different gray-scale brightnesses.

[0046] In an exemplary embodiment, the display panel 10 further includes an upper polarizer and a lower polarizer. The upper polarizer is disposed on a side of the color filter substrate facing away from the array substrate, and the lower polarizer is disposed on a side of the array substrate facing away from the color filter substrate. The upper polarizer and the lower polarizer are configured to convert the backlight of natural light into polarized backlight. The backlight provided by the backlight module 30 sequentially passes through the lower polarizer, the array substrate, the liquid crystal layer, the color filter substrate, and the upper polarizer.

[0047] In an exemplary embodiment, the display panel 10 may be an In-Plane Switching (IPS) display panel, and the backlight module 30 may be a direct-lit backlight module or an edge-lit backlight module. The present application does not make specific limitations thereto.

[0048] It can be understood that the display device 100 can be used in electronic devices including but not limited to televisions, tablet computers, laptop computers, desktop computers, mobile phones, in-vehicle displays, smart watches, smart bracelets, smart glasses, etc. According to the embodiments of the present application, the specific type of the display device 100 is not particularly limited, and those skilled in the art can make corresponding designs according to the specific usage requirements of the display device 100, which will not be elaborated herein.

[0049] In an exemplary embodiment, the display device 100 may further include other necessary components and constituent parts such as a driving board, a power board, a high-voltage board, a frame, and a button control board. The frame is used to assemble and fix the backlight module 30 and the display panel 10. Those skilled in the art can make corresponding supplements according to the specific type and actual function of the display device 100, which will not be elaborated herein.

[0050] Please refer to Figure 2 and Figure 3 , Figure 2 which is a top view structural schematic diagram of the backlight module when it is not emitting light, disclosed in the second embodiment of the present application. Figure 3 is Figure 2Schematic cross-sectional view of the backlight module shown along the III-III direction. In an embodiment of the present application, the backlight module 30 includes a middle frame 31, and the middle frame 31 includes a first middle frame 311 and a second middle frame 312. The second middle frame 312 is connected to the edge of the first middle frame 311 and is located on one side of the first middle frame 311. The backlight module 30 further includes an elastic film 32. The elastic film 32 is disposed on the side of the first middle frame 311 facing away from the second middle frame 312, and the display panel 10 is disposed on the side of the elastic film 32 facing away from the first middle frame 311. That is, the elastic film 32 is located between the display panel 10 and the first middle frame 311. The elastic film 32 has a certain elasticity and is used to achieve soft contact between the display panel 10 and the backlight module 30.

[0051] It can be understood that the middle frame 31 can be integrally formed, that is, the first middle frame 311 and the second middle frame 312 can be integrally formed. It can also be understood that since the second middle frame 312 is connected to the edge of the first middle frame 311, the second middle frame 312 is connected to the edge of the lower surface of the first middle frame 311, and the upper surface of the first middle frame 311 faces the display panel 10. Therefore, the side of the first middle frame 311 facing away from the second middle frame 312 here refers to the upper surface of the first middle frame 311 facing the display panel 10.

[0052] Please refer to Figure 4 , Figure 4 is Figure 2 Schematic internal structure view of the first middle frame of the backlight module shown. In an embodiment of the present application, a plurality of hollow portions 311a are formed on the side of the first middle frame 311 facing the elastic film 32, that is, a plurality of hollow portions 311a are formed on the side of the first middle frame 311 facing away from the second middle frame 312. The backlight module 30 includes a plurality of expansion components 33, and each of the hollow portions 311a is provided with the expansion component 33. The elastic film 32 covers a plurality of the hollow portions 311a. Please refer to Figure 5 and Figure 6 , Figure 5 is a top view structural schematic diagram of the backlight module when it emits light according to the second embodiment of the present application, Figure 6 is Figure 5Schematic diagram of the internal structure of the first middle frame of the backlight module shown. When the backlight module 30 emits light, the heat generated by the light-emitting components of the backlight module 30 is transferred to the plurality of expansion components 33, and the plurality of expansion components 33 expand when heated. That is, the expansion components 33 are used to receive the heat generated by the light-emitting components of the backlight module 30 and expand when the backlight module 30 emits light. A part of each expansion component 33 protrudes out of the hollow portion 311a and abuts against the elastic film 32, so that the elastic film 32 forms a plurality of protrusions 32a in the direction towards the display panel 10 to support the display panel 10. When the backlight module 30 stops emitting light, the temperature of the plurality of expansion components 33 decreases, the expansion components 33 release the abutment against the elastic film 32 and retract into the hollow portion 311a, and the plurality of protrusions 32a of the elastic film 32 disappear.

[0053] It can be understood that when the backlight module 30 does not emit light, that is, when the display panel 10 does not display an image, no plurality of protrusions 32a are formed on the elastic film 32. When the backlight module 30 emits light, that is, when the display panel 10 displays an image, the plurality of protrusions 32a on the elastic film 32 cause the display panel 10 and the backlight module 30 to form point contacts. At this time, when the display panel 10 is squeezed or pressed, the force is dispersed to the plurality of protrusions 32a, and the liquid crystal molecules at the squeezed or pressed position do not move in the vertical direction, thereby avoiding light leakage of the display panel 10.

[0054] In an embodiment of the present application,

[0055] In an exemplary embodiment, please refer to Figure 4 and Figure 6 , the cross-section of the hollow portion 311a perpendicular to its depth direction can be circular, elliptical or polygonal, that is, the hollow portion 311a can be a cylindrical hole, an elliptical cylindrical hole or a polygonal cylindrical hole, and the present application does not make specific restrictions on this. The aperture of the hollow portion 311a can be variable, that is, the hollow portion 311a can be a conical hole, an elliptical conical or polygonal conical hole, and the present application does not make specific restrictions on this. For example, please refer to Figure 7 , Figure 7 is Figure 2 Another schematic diagram of the internal structure of the first middle frame of the backlight module shown. In the direction of the elastic film 32 pointing to the first middle frame 311, the inner diameter of the hollow portion 311a gradually decreases, that is, the axial section of the hollow portion 311a can be an inverted trapezoid.

[0056] In an exemplary embodiment, the plurality of hollow portions 311a are arranged in sequence, and the shape formed by connecting the plurality of hollow portions 311a in sequence can be a rectangle.

[0057] In an embodiment of the present application, please refer to Figure 4 and Figure 6 , the expansion component 33 includes an expansion element 331, and the expansion element 331 is accommodated in the hollow portion 311a. When the backlight module 30 emits light, the heat generated by the light-emitting component of the backlight module 30 is transferred to the plurality of expansion elements 331. The plurality of expansion elements 331 expand when heated, and one end of the expansion element 331 facing the elastic film 32 extends out of the hollow portion 311a and abuts against the elastic film 32, so as to form a plurality of protrusions 32a on the elastic film 32 to support the display panel 10. When the backlight module 30 does not emit light, the temperature of the plurality of expansion elements 331 decreases, the expansion elements 331 release the abutment against the elastic film 32 and retract into the hollow portion 311a, and the plurality of protrusions 32a on the elastic film 32 disappear.

[0058] In an exemplary embodiment, one end of the expansion element 331 facing away from the elastic film 32 may be fixedly connected to the inner wall of the hollow portion 311a, and the portion of the expansion element 331 other than the end facing away from the elastic film 32 is not fixedly connected to the inner wall of the hollow portion 311a, so that one end of the expansion element 331 facing the elastic film 32 can extend out of the hollow portion 311a and can also retract into the hollow portion 311a.

[0059] In an exemplary embodiment, one end of the expansion element 331 facing away from the elastic film 32 may be in interference fit with the hollow portion 311a, so that one end of the expansion element 331 facing away from the elastic film 32 is fixedly connected to the inner wall of the hollow portion 311a. The portion of the expansion element 331 other than the end facing away from the elastic film 32 may be in clearance fit with the hollow portion 311a.

[0060] In an exemplary embodiment, the surface of the expansion element 331 facing the elastic film 32 may be an arc surface, so that the surface of the protrusion 32a facing the display panel 10 is also an arc surface, realizing point contact between the display panel 10 and the backlight module 30.

[0061] In an exemplary embodiment, the expansion element 331 is a solid, and the material of the expansion element 331 may include polyvinyl chloride, polyvinylidene chloride, ethylene-vinyl acetate copolymer, epoxy resin, or thermoplastic polymer, etc., and the present application does not make specific limitations thereto.

[0062] In an exemplary embodiment, the elastic film 32 may cover the surface of the first middle frame 311 facing away from the second middle frame 312, or may only cover the area where the hollow portion 311a is located. The present application does not make specific restrictions on this. The material of the elastic film 32 may include silicone rubber. The thickness of the elastic film 32 may be 0.1 mm to 0.3 mm. For example, 0.1 mm, 0.12 mm, 0.15 mm, 0.2 mm, 0.23 mm, 0.28 mm, 0.3 mm, or other values. The present application does not make specific restrictions on this.

[0063] In an exemplary embodiment, please refer to Figure 3 , both the first middle frame 311 and the second middle frame 312 may be rectangular hollow frame structures as a whole. The distance between the inner side surface and the outer side surface of the first middle frame 311 is greater than the distance between the inner side surface and the outer side surface of the second middle frame 312. The distance between the surface of the first middle frame 311 facing the second middle frame 312 and the surface of the first middle frame 311 facing away from the second middle frame 312 is less than the distance between the surface of the second middle frame 312 facing the first middle frame 311 and the surface of the second middle frame 312 facing away from the first middle frame 311.

[0064] In an embodiment of the present application, please refer to Figure 3 , the backlight module 30 further includes a back plate 34. The back plate 34 includes a back plate main body 341 and a side plate assembly 342. The side plate assembly 342 is disposed inside the second middle frame 312 and on the side of the first middle frame 311 facing the second middle frame 312. The back plate main body 341 is disposed on the side of the side plate assembly 342 facing away from the first middle frame 311, and the side plate assembly 342 is connected to the periphery of the back plate main body 341. The back plate main body 341 and the side plate assembly 342 enclose an accommodation space 34a.

[0065] In an exemplary embodiment, the back plate main body 341 as a whole may be a rectangular plate-like structure, and the side plate assembly 342 as a whole may be a rectangular hollow frame structure.

[0066] Please refer to Figure 8 , Figure 8 is Figure 2 a schematic cross-sectional view of the backlight module shown in the VIII-VIII direction. In an embodiment of the present application, the backlight module 30 further includes a light-emitting component 35. The light-emitting component 35 is located in the accommodation space 34a and is disposed on the inner side surface of one side plate of the side plate assembly 342. That is, the side plate assembly 342 includes four side plates, and the light-emitting component 35 is disposed on the inner side surface of one side plate. The light-emitting component 35 is used for emitting light.

[0067] In an exemplary embodiment, the light-emitting component 35 may include a light-emitting diode (LED) for emitting light.

[0068] In an embodiment of the present application, please refer to Figure 3 and Figure 8 , the backlight module 30 further includes a heat-conducting element 36, and the heat-conducting element 36 is disposed between the surface of the first middle frame 311 facing the side plate assembly 342 and the surface of the side plate assembly 342 facing the first middle frame 311, and between the inner side surface of the second middle frame 312 and the outer side surface of the side plate assembly 342. That is, the heat-conducting element 36 is disposed on a partial surface of the first middle frame 311 facing away from the elastic film 32 and the inner side surface of the second middle frame 312, and the heat-conducting element 36 is used for conducting heat for the light-emitting component 35.

[0069] It can be understood that when the light-emitting component 35 emits light, heat is generated, and the heat is sequentially transmitted to the middle frame 31 and the expansion assembly 33 through the side plate connected to the light-emitting component 35 and the heat-conducting element 36. The heat-conducting element 36 can transmit the heat generated by the light-emitting component 35 to each of the expansion assemblies 33, preventing some of the expansion assemblies 33 from not receiving heat.

[0070] In an exemplary embodiment, the heat-conducting element 36 may be a heat-conducting adhesive, and the heat-conducting adhesive has good heat-conducting performance and adhesiveness. Therefore, the heat-conducting element 36 can conduct heat and can bond the side plate assembly 342 to the first middle frame 311 and bond the side plate assembly 342 to the second middle frame 312.

[0071] In an embodiment of the present application, please refer to Figure 4 and Figure 6 , the hollow portion 311a penetrates through the first middle frame 311, the heat-conducting element 36 covers the openings of the plurality of hollow portions 311a facing away from the elastic film 32, and one end of the expansion element 331 facing away from the elastic film 32 is connected to the heat-conducting element 36 to improve the heat transfer efficiency. When the light-emitting component 35 emits light, the expansion element 331 can receive heat and expand in a shorter time.

[0072] In an embodiment of the present application, please refer to Figure 3 and Figure 8, the backlight module 30 further includes a light guide plate 37, the light guide plate 37 is disposed in the accommodation space 34a and on a side of the backplane main body 341 facing the side plate assembly 342, the first middle frame 311 covers the periphery of the light guide plate 37, the light emitting component 35 is disposed on one side of the light guide plate 37, and the light guide plate 37 is configured to convert horizontally incident light emitted by the light emitting component 35 into vertically emitted light. The backlight module 30 further includes a reflector 38, the reflector 38 is disposed between the light guide plate 37 and the backplane main body 341. The reflector 38 is configured to reflect light to improve the light emitting brightness of the backlight module 30.

[0073] In an embodiment of the present application, the backlight module 30 further includes an optical film assembly 39, the optical film assembly 39 is disposed on a side of the light guide plate 37 facing away from the reflector 38, and the first middle frame 311 covers the periphery of the optical film assembly 39. The optical film assembly 39 is configured to brighten the light and make the light more uniform.

[0074] In an exemplary embodiment, the optical film assembly 39 may include at least one prism sheet and at least one diffusion sheet stacked, the prism sheet is configured to increase the brightness of the light, and the diffusion sheet is configured to make the light more uniform. A plurality of hollow portions 311a are formed on a side of the first middle frame 311 facing the elastic film 32, the backlight module 30 includes a plurality of expansion components 33, each of the hollow portions 311a is provided with the expansion component 33, and the elastic film 32 covers the plurality of hollow portions 311a.

[0075] In summary, the backlight module 30 provided by the embodiment of the present application includes a middle frame 31. The middle frame 31 includes a first middle frame 311 and a second middle frame 312. The second middle frame 312 is connected to the edge of the first middle frame 311 and is located on one side of the first middle frame 311. A plurality of hollow portions 311a are formed on the side of the first middle frame 311 facing away from the second middle frame 312. An expansion component 33 is disposed in each of the hollow portions 311a. The backlight module 30 further includes an elastic film 32. The elastic film 32 is disposed on the side of the first middle frame 311 facing away from the second middle frame 312 and covers the plurality of hollow portions 311a. The display panel 10 is disposed on the side of the elastic film 32 facing away from the first middle frame 311. When the backlight module 30 emits light, the heat generated by the light-emitting component of the backlight module 30 is transferred to the middle frame 31. The plurality of expansion components 33 disposed in the hollow portions 311a are heated and expanded. Some of the expansion components 33 extend out of the hollow portions 311a and abut against the elastic film 32, so that the elastic film 32 forms a plurality of protrusions 32a in the direction facing the display panel 10 to support the display panel 10. Therefore, when the backlight module emits light, the plurality of protrusions 32a on the elastic film 32 enable the display panel 10 to form point contact with the backlight module 30. When the display panel 10 is squeezed or pressed, the force is dispersed to the plurality of protrusions 32a, and the liquid crystal molecules at the squeezed or pressed position will not move in the vertical direction, thereby avoiding light leakage of the display panel 10. In addition, the technical solution of the present application does not require pasting support rubber on the middle frame 31. The elastic film 32 and the middle frame 31 are integrated, reducing the assembly process of pasting support rubber in the prior art, avoiding the assembly defect of the support rubber coming off, and improving the assembly efficiency and the production capacity of the backlight module. Moreover, the technical solution of the present application also has the advantages of simple process, low cost and strong universality.

[0076] Please refer to Figure 9 , Figure 9 FIG. is a schematic internal structure diagram of the first middle frame when the backlight module disclosed in the third embodiment of the present application does not emit light. The difference between the backlight module of the third embodiment and the backlight module of the second embodiment is that: the hollow portion 311a of the backlight module of the third embodiment is different from the hollow portion 311a of the backlight module of the second embodiment, and the expansion component 33 of the backlight module of the third embodiment is different from the expansion component 33 of the backlight module of the second embodiment. For the description of the same parts between the backlight module of the third embodiment and the backlight module of the second embodiment, please refer to the relevant description of the backlight module of the second embodiment, which will not be repeated here.

[0077] In the embodiment of the present application, the expansion component 33 of the backlight module in the third embodiment includes an expansion element 331 and a resisting element 332. The expansion element 331 and the resisting element 332 are disposed in the hollow portion 311a. The expansion element 331 is located on the side of the resisting element 332 facing away from the elastic film 32, and the size of the resisting element 332 is larger than the opening of the hollow portion 311a facing the elastic film 32. Please refer to Figure 10 , Figure 10 which is a schematic diagram of the internal structure of the first middle frame when the backlight module disclosed in the third embodiment of the present application emits light. When the backlight module 30 emits light, the heat generated by the light-emitting component 35 of the backlight module 30 is transferred to the expansion element 331. The expansion element 331 expands due to heat. The expansion element 331 pushes the resisting element 332 to move towards the elastic film 32. Part of the resisting element 332 extends out of the hollow portion 311a and abuts against the elastic film 32. The elastic film 32 forms a plurality of the protrusions 32a in the direction towards the display panel 10. When the backlight module 30 stops emitting light from emitting light, the temperature of the plurality of expansion elements 331 decreases, the expansion elements 331 retract, the resisting element 332 releases the abutment against the elastic film 32, and the plurality of protrusions 32a of the elastic film 32 disappear. The elastic effect of the elastic film 32 causes the resisting element 332 to move towards the expansion element 331.

[0078] It can be understood that the size of the resisting element 332 is larger than the size of the opening of the hollow portion 311a facing the elastic film 32, so that part of the resisting element 332 can extend out of the hollow portion 311a. The remaining part of the resisting element 332 is restricted within the hollow portion 311a through the opening of the hollow portion 311a facing the elastic film 32, so that the heights of the plurality of resisting elements 332 extending out of the hollow portion 311a are the same. Furthermore, the heights of the plurality of protrusions 32a on the elastic film 32 are the same, avoiding different heights of the plurality of protrusions 32a caused by different degrees of expansion of the plurality of expansion elements 331. If the heights of the plurality of protrusions 32a are different, it may cause the display panel 10 to be inclined relative to the backlight module 30.

[0079] In the embodiment of the present application, the hollow portion 311a penetrates through the first middle frame 311, the heat conducting element 36 covers the openings of the plurality of hollow portions 311a facing away from the elastic film 32, and one end of the expansion element 331 facing away from the abutting element 332 is connected to the heat conducting element 36 to improve the heat transfer efficiency. The inner diameter of at least a part of the hollow portion 311a increases in the direction from the elastic film 32 to the first middle frame 311, so that the abutting element 332 can be placed in the hollow portion 311a and the size of the abutting element 332 is larger than the size of the opening of the hollow portion 311a facing the elastic film 32.

[0080] In an exemplary embodiment, the abutting element 332 may be a hollow spherical or spherical-like structure, and the abutting element 332 has a certain hardness. It can be understood that the inside of the abutting element 332 is hollow, so that the mass of the abutting element 332 is relatively light, which is beneficial for the expansion element 331 to push the abutting element 332. The overall shape of the abutting element 332 is spherical or spherical-like, that is, the surface of the abutting element 332 facing the elastic film 32 is an arc surface. After the abutting element 332 abuts against the elastic film 32 in the direction towards the display panel 10, the surface of the protrusion 32a facing away from the expansion element 331 is an arc surface, realizing point contact between the display panel 10 and the backlight module 30.

[0081] In an exemplary embodiment, the material of the abutting element 332 may include polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), polypropylene (PP), etc., and the present application does not make specific limitations thereto. The diameter of the abutting element 332 is 0.4 mm to 1.5 mm. For example, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.25 mm, 1.5 mm, or other values, and the present application does not make specific limitations thereto. The wall thickness of the abutting element 332 may be 10 um to 50 um. For example, 10 um, 15 um, 21 um, 25 um, 30 um, 37 um, 43 um, 48 um, 50 um, or other values, and the present application does not make specific limitations thereto.

[0082] In summary, the backlight module 30 provided in the embodiment of the present application is disposed on one side of the display panel 10. The backlight module 30 includes a middle frame 31, and the middle frame 31 includes a first middle frame 311 and a second middle frame 312. The second middle frame 312 is connected to the edge of the first middle frame 311 and is located on one side of the first middle frame 311. A plurality of hollow portions 311a are formed on the side of the first middle frame 311 facing away from the second middle frame 312, and an expansion assembly 33 is disposed in each of the hollow portions 311a. The backlight module 30 further includes an elastic film 32. The elastic film 32 is disposed on the side of the first middle frame 311 facing away from the second middle frame 312 and covers the plurality of hollow portions 311a. The display panel 10 is disposed on the side of the elastic film 32 facing away from the first middle frame 311. When the backlight module 30 emits light, the heat generated by the light-emitting component of the backlight module 30 is transferred to the middle frame 31. The plurality of expansion assemblies 33 disposed in the hollow portions 311a are heated and expanded, and some of the expansion assemblies 33 protrude out of the hollow portions 311a and abut against the elastic film 32, so that the elastic film 32 forms a plurality of protrusions 32a in the direction facing the display panel 10 to support the display panel 10. Therefore, when the backlight module emits light, the plurality of protrusions 32a on the elastic film 32 cause the display panel 10 to form point contact with the backlight module 30. When the display panel 10 is squeezed or pressed, the force is dispersed to the plurality of protrusions 32a, and the liquid crystal molecules at the squeezed or pressed position do not move in the vertical direction, thereby avoiding light leakage of the display panel 10.

[0083] Please refer to Figure 11 , Figure 11 which is a schematic internal structure diagram of the first middle frame when the backlight module disclosed in the fourth embodiment of the present application does not emit light. The difference between the backlight module of the fourth embodiment and the backlight module of the third embodiment is that the expansion assembly 33 of the backlight module of the fourth embodiment is different from the expansion assembly 33 of the backlight module of the third embodiment. For the description of the same parts between the backlight module of the fourth embodiment and the backlight module of the third embodiment, please refer to the relevant description of the backlight module of the third embodiment, which will not be repeated here.

[0084] In the embodiment of the present application, the hollow portion 311a does not penetrate through the first middle frame 311, that is, the hollow portion 311a forms a groove structure within the first middle frame 311. The expansion assembly 33 includes a resisting element 332, a flexible element 333, and an expansion liquid 334. The expansion liquid 334 is disposed within the hollow portion 311a and covers the bottom of the hollow portion 311a. The flexible element 333 is fixed within the hollow portion 311a and seals the expansion liquid 334, that is, the flexible element 333 is at least partially fixed within the hollow portion 311a and seals the expansion liquid 334 within the hollow portion 311a. The resisting element 332 is disposed on the side of the flexible element 333 facing away from the expansion liquid 334, that is, the resisting element 332 and the expansion liquid 334 are respectively located on opposite sides of the flexible element 333.

[0085] Please refer to Figure 12 , Figure 12 is a schematic diagram of the internal structure of the first middle frame when the backlight module of the fourth embodiment of the present application emits light. When the backlight module 30 emits light, the heat generated by the light-emitting component 35 of the backlight module 30 is transferred to the expansion liquid 334. The expansion liquid 334 expands in volume when heated. The expansion liquid 334 pushes the flexible element 333 to bulge towards the resisting element 332. The resisting element 332 moves towards the elastic membrane 32. A part of the resisting element 332 extends out of the hollow portion 311a and abuts against the elastic membrane 32, causing the elastic membrane 32 to form a plurality of the protrusions 32a in the direction towards the display panel 10. When the backlight module 30 does not emit light, the temperature of the expansion liquid 334 decreases and its volume decreases. The flexible element 333 changes from bulging towards the resisting element 332 to bulging towards the expansion liquid 334. The resisting element 332 releases the abutment against the elastic membrane 32, and the plurality of protrusions 32a of the elastic membrane 32 disappear. The elastic action of the elastic membrane 32 causes the resisting element 332 to move towards the flexible element 333.

[0086] In the embodiment of the present application, the area of the flexible element 333 is larger than the area corresponding to the inner wall of the hollow portion 311a connected to the flexible element 333. When the expansion liquid 334 is not expanded, the flexible element 333 bulges towards the expansion liquid 334; when the expansion liquid 334 expands, the flexible element 333 bulges towards the elastic membrane 32.

[0087] In an exemplary embodiment, the material of the expansion liquid 334 may include organic solvents or oils, etc. Among them, the organic solvents may be methanol, ethanol, acetone, etc., and the oils may be vegetable oils or mineral oils, etc. The present application does not make specific limitations in this regard.

[0088] In the embodiment of the present application, please refer to togetherFigure 11 , Figure 12 and Figure 13 , Figure 13 is a schematic diagram of a partial layer structure of a backlight module disclosed in the fourth embodiment of the present application. The first middle frame 311 includes a first sub-frame 311b, a second sub-frame 311c, and a flexible film 311d. The second sub-frame 311c is disposed on a side of the second middle frame 312 facing the elastic film 32, and the second middle frame 312 is connected to an edge of the second sub-frame 311c. The flexible film 311d is disposed on a side of the second sub-frame 311c facing away from the second middle frame 312. The first sub-frame 311b is disposed on a side of the flexible film 311d facing away from the second sub-frame 311c. The elastic film 32 is disposed on a side of the first sub-frame 311b facing away from the flexible film 311d. That is, the second middle frame 312, the second sub-frame 311c, the flexible film 311d, the first sub-frame 311b, and the elastic film 32 are stacked in sequence.

[0089] In an exemplary embodiment, please refer to Figure 11 and Figure 12 , a plurality of receiving holes 301 penetrating through the first sub-frame 311b are formed in the first sub-frame 311b. A plurality of receiving grooves 302 are formed on a side of the second sub-frame 311c facing the first sub-frame 311b. The receiving holes 301 penetrate through the first sub-frame 311b, and the receiving grooves 302 do not penetrate through the second sub-frame 311c. Positions of the plurality of receiving holes 301 correspond to positions of the plurality of receiving grooves 302 one by one. That is, a positive projection of one receiving hole 301 on the elastic film 32 coincides with or partially coincides with a positive projection of one receiving groove 302 on the elastic film 32. One receiving hole 301 and a corresponding one receiving groove 302 form one hollow portion 311a.

[0090] In an exemplary embodiment, the expansion liquid 334 is filled in the receiving groove 302, and the flexible film 311d seals the expansion liquid 334 into the receiving groove 302. A portion of the flexible film 311d covering the receiving groove 302 forms the flexible element 333. That is, the flexible film 311d includes a plurality of the flexible elements 333. The abutting element 332 is disposed in the receiving hole 301.

[0091] It can be understood that by sandwiching the flexible film 311d between the first sub-frame 311b and the second sub-frame 311c, the sealing performance of the flexible element 333 to the expansion liquid 334 is improved.

[0092] In an exemplary embodiment, the inner diameter of at least a part of the receiving hole 301 increases in the direction of the elastic film 32 pointing to the first sub-frame 311b, so that the abutting element 332 can be placed into the receiving hole 301 and the size of the abutting element 332 is larger than the size of the opening of the receiving hole 301 facing the elastic film 32.

[0093] In an exemplary embodiment, the material of the flexible film 311d may include silicone rubber, and the present application does not make specific limitations thereto.

[0094] In summary, the backlight module 30 provided in the embodiment of the present application is disposed on one side of the display panel 10. The backlight module 30 includes a middle frame 31, and the middle frame 31 includes a first middle frame 311 and a second middle frame 312. The second middle frame 312 is connected to the edge of the first middle frame 311 and is located on one side of the first middle frame 311. A plurality of hollow portions 311a are formed on the side of the first middle frame 311 facing away from the second middle frame 312, and an expansion assembly 33 is disposed in each of the hollow portions 311a. The backlight module 30 further includes an elastic film 32, and the elastic film 32 is disposed on the side of the first middle frame 311 facing away from the second middle frame 312 and covers the plurality of hollow portions 311a. The display panel 10 is disposed on the side of the elastic film 32 facing away from the first middle frame 311. When the backlight module 30 emits light, the heat generated by the light-emitting component of the backlight module 30 is transferred to the middle frame 31, and the plurality of expansion assemblies 33 disposed in the hollow portions 311a are heated and expanded, and part of the expansion assemblies 33 protrude out of the hollow portions 311a and abut against the elastic film 32, so that a plurality of protrusions 32a are formed on the elastic film 32 in the direction facing the display panel 10 to support the display panel 10. Therefore, when the backlight module emits light, the plurality of protrusions 32a on the elastic film 32 cause the display panel 10 to form point contact with the backlight module 30. When the display panel 10 is squeezed or pressed, the force is dispersed to the plurality of protrusions 32a, and the liquid crystal molecules at the squeezed or pressed position do not move in the vertical direction, thereby avoiding light leakage of the display panel 10.

[0095] Please refer to Figure 14 , Figure 14 which is a schematic diagram of the internal structure of the first middle frame when the backlight module disclosed in the fifth embodiment of the present application does not emit light. The difference between the backlight module of the fifth embodiment and the backlight module of the fourth embodiment lies in that the expansion assembly 33 of the backlight module of the fifth embodiment is different from the expansion assembly 33 of the backlight module of the fourth embodiment. For the description of the same parts between the backlight module of the fifth embodiment and the backlight module of the fourth embodiment, please refer to the relevant description of the backlight module of the fourth embodiment, which will not be elaborated herein.

[0096] In the embodiment of the present application, the hollow portion 311a does not penetrate through the first middle frame 311, that is, the hollow portion 311a forms a groove structure within the first middle frame 311. The expansion assembly 33 of the backlight module in the fifth embodiment includes a resisting element 332, a flexible element 333, and a melting element 335. The melting element 335 is disposed within the hollow portion 311a and covers the bottom of the hollow portion 311a. The flexible element 333 is fixed within the hollow portion 311a and seals the melting element 335, that is, the flexible element 333 is at least partially fixed within the hollow portion 311a and seals the melting element 335 within the hollow portion 311a. The resisting element 332 is disposed on a side of the flexible element 333 facing away from the melting element 335, that is, the resisting element 332 and the melting element 335 are respectively located on opposite sides of the flexible element 333.

[0097] Please refer to Figure 15 , Figure 15 which is a schematic internal structure diagram of the first middle frame when the backlight module disclosed in the fifth embodiment of the present application emits light. When the backlight module 30 emits light, the heat generated by the light-emitting component 35 of the backlight module 30 is transferred to the melting element 335. The melting element 335 is heated and melted into a liquid state and its volume increases. The liquid melting element 335 pushes the flexible element 333 to bulge towards the resisting element 332. The resisting element 332 moves towards the elastic film 32. A part of the resisting element 332 extends out of the hollow portion 311a and abuts against the elastic film 32, so that a plurality of the protrusions 32a are formed on the elastic film 32 in the direction towards the display panel 10. When the backlight module 30 stops emitting light from emitting light, the temperature of the melting element 335 decreases. The melting element 335 changes from a liquid state to a solid state and the volume of the melting element 335 decreases. The flexible element 333 changes from bulging towards the resisting element 332 to bulging towards the melting element 335. The resisting element 332 releases the abutment against the elastic film 32. The elastic action of the elastic film 32 causes the resisting element 332 to move towards the flexible element 333.

[0098] In an exemplary embodiment, the material of the melting element 335 may include materials such as wax, colloidal polymer, soft metal alloy, etc. that melt and increase in volume under low-temperature conditions. The present application does not make specific limitations on this.

[0099] In the embodiment of the present application, the melting element 335 is disposed within the accommodation groove 302 of the second sub-frame 311c.

[0100] In summary, the backlight module 30 provided in the embodiment of the present application is disposed on one side of the display panel 10. The backlight module 30 includes a middle frame 31, and the middle frame 31 includes a first middle frame 311 and a second middle frame 312. The second middle frame 312 is connected to the edge of the first middle frame 311 and is located on one side of the first middle frame 311. A plurality of hollow portions 311a are formed on the side of the first middle frame 311 facing away from the second middle frame 312, and an expansion assembly 33 is disposed in each of the hollow portions 311a. The backlight module 30 further includes an elastic film 32. The elastic film 32 is disposed on the side of the first middle frame 311 facing away from the second middle frame 312 and covers the plurality of hollow portions 311a. The display panel 10 is disposed on the side of the elastic film 32 facing away from the first middle frame 311. When the backlight module 30 emits light, the heat generated by the light-emitting component of the backlight module 30 is transferred to the middle frame 31. The plurality of expansion assemblies 33 disposed in the hollow portions 311a are heated and expanded, and some of the expansion assemblies 33 protrude out of the hollow portions 311a and abut against the elastic film 32, so that a plurality of protrusions 32a are formed on the elastic film 32 in the direction facing the display panel 10 to support the display panel 10. Therefore, when the backlight module emits light, the plurality of protrusions 32a on the elastic film 32 cause the display panel 10 to form point contacts with the backlight module 30. When the display panel 10 is squeezed or pressed, the force is dispersed to the plurality of protrusions 32a, and the liquid crystal molecules at the squeezed or pressed position do not move in the vertical direction, thereby avoiding light leakage of the display panel 10.

[0101] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0102] It should be understood that the application of the present application is not limited to the above examples. For those of ordinary skill in the art, improvements or changes can be made according to the above description. All such improvements and changes should fall within the protection scope of the appended claims of the present application. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A backlight module, comprising a middle frame, the middle frame including a first middle frame and a second middle frame, the second middle frame being connected to an edge of the first middle frame, characterized in that, a plurality of hollow portions are formed on a side of the first middle frame facing away from the second middle frame, an expansion component is disposed in each of the hollow portions, the backlight module further includes an elastic film, the elastic film is disposed on the side of the first middle frame facing away from the second middle frame and covers the plurality of hollow portions; wherein, the expansion component is configured to receive heat generated by a light-emitting component of the backlight module and expand when the backlight module emits light, a part of each expansion component protrudes out of the hollow portion and abuts against the elastic film, so that a plurality of protrusions are formed on the elastic film to support a display panel.

2. The backlight module according to claim 1, characterized in that, the expansion component includes an expansion element; wherein, the plurality of expansion elements expand when heated, and one end of the expansion element facing the elastic film protrudes out of the hollow portion and abuts against the elastic film, so that a plurality of the protrusions are formed on the elastic film to support the display panel.

3. The backlight module according to claim 2, characterized in that, a surface of the expansion element facing the elastic film is an arc surface.

4. The backlight module according to claim 1, characterized in that, the expansion component includes an expansion element and a resisting element, the expansion element is located on a side of the resisting element facing away from the elastic film, and a size of the resisting element is larger than a size of an opening of the hollow portion facing the elastic film; wherein, the expansion element expands when heated, the expansion element pushes the resisting element to move towards the elastic film, a part of the resisting element protrudes out of the hollow portion and abuts against the elastic film, so that a plurality of the protrusions are formed on the elastic film to support the display panel.

5. The backlight module according to claim 1, characterized in that, the hollow portion does not penetrate through the first middle frame, the expansion component includes a resisting element, a flexible element and an expansion liquid, the expansion liquid is disposed at a bottom of the hollow portion, the flexible element is fixed in the hollow portion and seals the expansion liquid, the resisting element is disposed on a side of the flexible element facing away from the expansion liquid, and a size of the resisting element is larger than a size of an opening of the hollow portion facing the elastic film; wherein, the volume of the expansion liquid increases when heated, the expansion liquid pushes the flexible element to bulge towards the resisting element, the resisting element moves towards the elastic film, a part of the resisting element protrudes out of the hollow portion and abuts against the elastic film, so that a plurality of the protrusions are formed on the elastic film to support the display panel.

6. The backlight module according to claim 1, characterized in that, The hollow portion does not penetrate through the first middle frame. The expansion component includes a resisting element, a flexible element, and a melting element. The melting element is disposed at the bottom of the hollow portion. The flexible element is fixed within the hollow portion and seals the melting element. The resisting element is disposed on a side of the flexible element facing away from the melting element, and a size of the resisting element is greater than a size of an opening of the hollow portion facing the elastic film; wherein, when the melting element is heated and melted into a liquid state and its volume increases, the liquid melting element pushes the flexible element to protrude towards the resisting element, the resisting element moves towards the elastic film, and a part of the resisting element extends out of the hollow portion and abuts against the elastic film, so that a plurality of the protrusions are formed on the elastic film to support the display panel.

7. The backlight module according to any one of claims 4-6, characterized in that, the inside of the resisting element is hollow, and a surface of the resisting element facing the elastic film is an arc surface.

8. The backlight module according to any one of claims 4-6, characterized in that, an inner diameter of at least a part of the hollow portion increases in a direction in which the elastic film points to the first middle frame.

9. The backlight module according to any one of claims 1-6, characterized in that, the backlight module further includes a heat conducting element. The heat conducting element is disposed on a part of a surface of the first middle frame facing away from the elastic film and an inner side surface of the second middle frame. The heat conducting element is used for heat conduction.

10. A display device, characterized in that, it includes a display panel and the backlight module according to any one of claims 1-9. The display panel is disposed on a light-emitting side of the backlight module.

Images