Backlight module and display device

Abstract

The utility model provides a backlight module and a display device, the backlight module comprises a back plate, the back plate comprises a main body part and an extension part, and the extension part and the main body part define a containing groove; the diffusion plate is lapped in the accommodating groove; the fixing frame comprises a frame, the frame is connected with the side, away from the main body part, of the extending part, and a groove is formed in the inner surface of the frame; and the diaphragm assembly is in lap joint in the groove. The backlight module can improve the overall stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially, relate to a backlight module and display device. BACKGROUND

[0002] In the field of display device design, it has become a mainstream trend to pursue higher screen ratio and narrower frame. However, this trend has brought unprecedented challenges to the stability of diffusion plate and film. Specifically, as the frame design of display device becomes increasingly narrow, the size of BM (Black Matrix, i.e. black matrix) area located in the non-display area also correspondingly reduces significantly. The BM area can avoid light leakage at the edge of the screen, effectively prevent halo or glare at the edge of the screen, and ensure the purity and clarity of the display picture. When the size of the BM area is reduced to the point that it cannot meet the space required for the expansion or contraction of the diffusion plate and film due to temperature changes and other reasons, the diffusion plate and film may have visual defects such as water ripples, which in turn significantly affects the user's viewing experience.

[0003] Therefore, for display devices that adopt narrow BM area design, how to effectively balance the expansion / contraction space requirements of the diffusion plate and film has become an urgent and crucial technical problem to be solved. SUMMARY

[0004] The embodiments of the present application provide a backlight module and a display device, which can improve the overall stability and display quality.

[0005] The embodiments of the present application provide a backlight module, which comprises:

[0006] A back plate comprising a main body portion and an extension portion, the extension portion and the main body portion surrounding to form an accommodating groove;

[0007] A diffusion plate lapped in the accommodating groove;

[0008] A fixing frame comprising a frame connected with the side of the extension portion away from the main body portion, the inner surface of the frame being provided with a groove;

[0009] A film assembly lapped in the groove.

[0010] In some embodiments, the extension comprises a lap joint, a first fold and a second fold connected in sequence, the lap joint is connected with the main body, the lap joint extends along a direction perpendicular to a thickness direction of the backlight module, the first fold is connected with the lap joint, the first fold extends along the thickness direction of the backlight module, the second fold extends along a direction perpendicular to the thickness direction of the backlight module, the first fold, the second fold and the lap joint form the accommodating groove; the fixing frame is connected with the second fold.

[0011] In some embodiments, the fixing frame further comprises a limiting portion, the limiting portion is connected with the frame, the limiting portion is arranged on a side of the frame close to the back plate, the limiting portion is arranged at a slot opening of the accommodating groove, the limiting portion, the first fold, the second fold and the lap joint form the accommodating groove.

[0012] In some embodiments, a side of the limiting portion away from the frame is coplanar with a side of the second fold close to the accommodating groove.

[0013] In some embodiments, the limiting portion and the frame form a limiting groove; the first fold is clamped in the limiting groove.

[0014] In some embodiments, the frame comprises a first support portion and a second support portion, the first support portion has a first bearing surface; the second support portion is connected to the first bearing surface of the first support portion, the first support portion and the second support portion form the recess, a side of the second support portion away from the first support portion forms a second bearing surface.

[0015] In some embodiments, the first support portion has a first inclined surface, the first inclined surface is connected with the first bearing surface, the first inclined surface is inclined towards a direction away from the first bearing surface; a side of the limiting portion away from the second fold is a third inclined surface, the first inclined surface is coplanar with the third inclined surface.

[0016] In some embodiments, the fixing frame further comprises a reflective layer, the reflective layer is arranged on the first inclined surface and / or the third inclined surface.

[0017] In some embodiments, the second support portion further has a second inclined surface, the second inclined surface is connected with the second bearing surface, the second inclined surface is inclined towards a direction close to the second bearing surface.

[0018] Embodiments of the present application also provide a display device, comprising:

[0019] a backlight module, the backlight module is the above-mentioned backlight module;

[0020] A liquid crystal module is arranged opposite to the backlight module, and the liquid crystal module is connected to a side of the fixing frame away from the back plate.

[0021] In some embodiments, the frame includes a first support part having a first bearing surface, and a second support part connected to the first bearing surface of the first support part, the first support part and the second support part forming the recess, and a second bearing surface is formed on a side of the second support part away from the first support part, and the liquid crystal module is connected to the second bearing surface.

[0022] In some embodiments, the display device further includes a middle frame including a first frame part, a second frame part, and a third frame part, the second frame part and the third frame part being connected to the first frame part, the first frame part extending in a thickness direction of the display device, the second frame part and the third frame part extending in a direction perpendicular to the thickness direction of the display device, the second frame part being connected to a side of the liquid crystal module away from the backlight module, and the third frame part being connected to a side of the backlight module away from the liquid crystal module.

[0023] The backlight module and the display device provided by the embodiments of the present application include a back plate and a fixing frame. The back plate includes a main body part and an extension part, and the extension part and the main body part form a receiving groove configured to carry a diffusion plate. The receiving groove not only provides stable support for the diffusion plate, but also reserves sufficient space to meet the expansion / contraction requirement of a diaphragm assembly, ensuring that the diaphragm assembly can maintain a good working state under various conditions. The fixing frame includes a frame connected to a side of the extension part away from the main body part, and an inner surface of the frame is provided with a recess configured to carry the diaphragm assembly. The backlight module can improve the display quality and stability of the display device. The recess can ensure the flatness and stability of the diaphragm assembly after installation, and effectively ensure that the expansion / contraction space of the diaphragm assembly is not affected. Compared with the prior art in which the diaphragm assembly is directly lapped on the diffusion plate, the diffusion plate and the diaphragm assembly in the embodiments of the present application are independently arranged in different spaces and do not affect each other, further improving the overall stability and display quality. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The first structure diagram of the backlight module provided by the embodiments of the present application is shown.

[0026] Figure 2 The first structure schematic diagram of the fixing frame provided by the embodiment of the present application.

[0027] Figure 3 The second structure schematic diagram of the backlight module provided by the embodiment of the present application.

[0028] Figure 4 The first structure schematic diagram of the frame provided by the embodiment of the present application.

[0029] Figure 5 The second structure schematic diagram of the frame provided by the embodiment of the present application.

[0030] Figure 6 The third structure schematic diagram of the frame provided by the embodiment of the present application.

[0031] Figure 7 The fourth structure schematic diagram of the frame provided by the embodiment of the present application.

[0032] Figure 8 The fifth structure schematic diagram of the frame provided by the embodiment of the present application.

[0033] Figure 9 The sixth structure schematic diagram of the frame provided by the embodiment of the present application.

[0034] Figure 10 The seventh structure schematic diagram of the frame provided by the embodiment of the present application.

[0035] Figure 11 The eighth structure schematic diagram of the frame provided by the embodiment of the present application.

[0036] Figure 12 The ninth structure schematic diagram of the frame provided by the embodiment of the present application.

[0037] Figure 13 The second structure schematic diagram of the fixing frame provided by the embodiment of the present application.

[0038] Figure 14 The third structure schematic diagram of the fixing frame provided by the embodiment of the present application.

[0039] Figure 15 The structure schematic diagram of the display device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0040] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0041] The present application provides a backlight module and a display device, which can improve the structural stability. The specific description is made below with reference to the drawings.

[0042] Please refer to Figure 1 , Figure 1 The first structural schematic diagram of the backlight module provided by the present application is shown.

[0043] The present application provides a backlight module 10, which is used to provide sufficient brightness and uniformly distributed light source, so that the liquid crystal module can normally display images. The backlight module 10 has a display area 200 and a non-display area 300 surrounding the display area 200, and a BM area is located in the non-display area 300. The BM area is mainly formed in the edge area of the liquid crystal panel by a specific process and technology. In the LCD liquid crystal panel screen, the BM area is located at the outermost periphery of the VA (Visual Area). Its main function is to prevent light from leaking out from the edge of the LCD. The backlight module 10 is usually composed of light sources (such as LED light bars), light guide plates, diffusion plates 4, reflection plates, film assemblies 2 and other components. The backlight module 10 can include a direct type backlight module and a side type backlight module.

[0044] The direct type backlight mode usually refers to using multiple LED lamp beads as light sources, and the lamp beads are directly arranged at the back of the liquid crystal panel. The direct type backlight can provide uniform and high-brightness backlight effect, and is suitable for large-size display devices 100. The backlight module in the present application is described as a direct type backlight module.

[0045] The backlight module 10 includes a back plate 3, a fixing frame 1, a diffusion plate 4 and a film assembly 2.

[0046] The back plate 3 is usually made of metal or plastic material, and is used to fix and protect other components in the backlight module 10. The back plate 3 can be punched to form reinforcing ribs to further improve the strength. The fixing frame 1 includes a frame 11, and the material of the frame 11 can be plastic, silica gel and metal. The frame 11 surrounds to form an accommodation space 111, i.e. the inside of the frame 11, which is used to install and fix the internal components of the display device 100, such as the film assembly 2.

[0047] The back plate 3 comprises a main body part 31 and an extension part 32, the extension part 32 and the main body part 31 form a containing groove 33, the containing groove 33 is configured to carry the diffusion plate 4. The extension part 32 is connected with the edge of the main body part 31, and is wound or bent over one side of the main body part 31, so that the extension part 32 forms a "C" shape on one side of the main body part 31. The containing groove 33 not only provides stable support for the diffusion plate 4, but also reserves enough space to meet the expansion / contraction requirements of the diffusion plate 4, ensuring that it can maintain good working condition under various conditions.

[0048] The diffusion plate 4 is lapped in the containing groove 33. The diffusion plate 4 is used to uniformly diffuse the light emitted by the light source of the backlight module 10, avoiding screen bright spots caused by excessive concentration of light.

[0049] Please continue to refer to Figure 1 and Figure 2 , Figure 2 The first structure diagram of the fixing frame provided in the embodiment of the application. The fixing frame 1 comprises a frame 11, the frame 11 is connected with the side of the extension part 32 away from the main body part 31, and the inner surface of the frame 11 is provided with a recess 113, the recess 113 is configured to carry the diaphragm assembly 2. The frame 11 can form a containing space 111, and the inner surface of the frame 11 is provided with a recess 113, the recess 113 communicates with the containing space 111, i.e. the inside of the frame 11. The diaphragm assembly 2 can be lapped in the recess 113, so that the diaphragm assembly 2 is arranged in the containing space 111, i.e. the inside of the frame 11, and the recess 113 is used for fixing the diaphragm assembly 2, i.e. the recess 113 provides additional space for expansion or contraction of the diaphragm assembly 2. The liquid crystal module 20 can be connected with the side end surface of the frame 11 away from the back plate 3.

[0050] The diaphragm assembly 2 is lapped in the recess 113. The diaphragm assembly 2 usually comprises a light enhancement sheet, a polarizing sheet and the like, which is used for enhancing and regulating light, and improving display effect.

[0051] In the prior art, the diaphragm assembly 2 is usually directly lapped on the diffusion plate 4, which is easy to cause mutual influence between the two, and further affect the display effect. In the embodiment of the application, the diffusion plate 4 and the diaphragm assembly 2 are independently arranged in different spaces, avoiding mutual interference. This design not only improves the overall stability of the backlight module 10, but also makes the display quality more uniform and delicate.

[0052] Please refer to Figure 3 , Figure 3The second structure diagram of the backlight module provided by the embodiment of the present application is shown in FIG. 2. The fixing frame 1 further comprises a positioning column 109 fixed on the frame 11. Correspondingly, the edge of the film sheet assembly 2 is provided with a hanging ear hole 21. When the film sheet assembly 2 is hung on the positioning column 109 through the hanging ear hole 21, the positioning column 109 not only plays a supporting role, but also limits the moving range of the film sheet assembly 2 through its position, thereby effectively preventing the dislocation or loosening phenomenon of the film sheet assembly 2 that may occur in the use process.

[0053] Further, the liquid crystal module 20 can be connected with the end surface of the frame 11 away from the back plate 3.

[0054] In some embodiments, the extension 32 is configured by a series of folding edges, which not only significantly enhances the overall structural strength of the back plate 3, but also provides a stable and reliable support environment for the diffusion plate 4. Specifically, please refer to Figure 1 The extension 32 comprises a lap joint portion 321, a first folding edge 322 and a second folding edge 323 connected in sequence, the lap joint portion 321 is connected with the main body portion 31, the lap joint portion 321 extends along the thickness direction perpendicular to the backlight module 10, the first folding edge 322 is connected with the lap joint portion 321, the first folding edge 322 extends along the thickness direction of the backlight module 10, the second folding edge 323 extends along the thickness direction perpendicular to the backlight module 10, the first folding edge 322, the second folding edge 323 and the lap joint portion 321 together form a "C" shape and surround to form a receiving groove 33, the receiving groove 33 is specially designed for bearing the diffusion plate 4, which ensures the stability and accuracy of the diffusion plate 4 in the installation process. The fixing frame 1 is connected with the second folding edge 323, forming a compact and stable overall structure.

[0055] Please refer to Figure 1 The fixing frame 1 further comprises a limiting portion 141 connected with the frame 11, the limiting portion 141 is arranged on the side of the frame 11 close to the back plate 3, the limiting portion 141 is arranged at the slot opening of the receiving groove 33, the limiting portion 141, the first folding edge 322, the second folding edge 323 and the lap joint portion 321 surround to form the receiving groove 33, and the limiting portion 141 is helpful to increase the depth of the receiving groove 33. The deepened receiving groove 33 provides more abundant installation space for the diffusion plate 4, and also reserves sufficient space allowance for the expansion or contraction of the diffusion plate 4 due to temperature changes and other factors. This design not only ensures the stability and accuracy of the diffusion plate 4 in the installation process, but also effectively prevents the diffusion plate 4 from deforming or being damaged due to insufficient space, thereby prolonging the service life of the backlight module 10.

[0056] The limiting part 141 is coplanar with the side of the second folding edge 323 close to the accommodating groove 33, which ensures that the accommodating groove 33 still maintains a constant cross-sectional area after the limiting part 141 is added, thereby ensuring the continuity of the internal space of the accommodating groove 33 and avoiding space compression or deformation caused by the addition of the limiting part 141, thereby ensuring the stability and reliability of the diffusion plate 4 and the diaphragm assembly 2 during installation and use.

[0057] The limiting part 141 and the frame 11 form a limiting groove 142, and the first folding edge 322 is clamped in the limiting groove 142. This not only enhances the connection strength between the limiting part 141 and the frame 11, but also provides a more convenient and stable way for the connection between the back plate 3 and the fixing frame 1. Specifically, the first folding edge 322 can be cleverly clamped in the limiting groove 142, and the quick connection between the back plate 3 and the fixing frame 1 can be achieved through simple clamping operation, which simplifies the assembly process of the backlight module 10 and improves the production efficiency.

[0058] Please refer to Figure 4 , Figure 4 The first structure diagram of the frame provided by the embodiment of the application is shown. The frame 11 includes a first support part 115 and a second support part 117, and the first support part 115 has a first supporting surface 1151. On the frame 11, the first supporting surface 1151 refers to a plane or surface for supporting and fixing the diaphragm assembly 2. The first supporting surface 1151 has a specific shape and size to ensure that the diaphragm assembly 2 can be correctly installed and positioned, i.e., the first supporting surface 1151 can be used to support the diaphragm assembly 2.

[0059] The second support part 117 is connected to the first supporting surface 1151 of the first support part 115, and the first support part 115 and the second support part 117 form a groove 113, and the side of the second support part 117 away from the first support part 115 forms a second supporting surface 1171. On the frame 11, the second supporting surface 1171 refers to a plane or surface for supporting and fixing the liquid crystal module 20. Similar to the first supporting surface 1151, the second supporting surface 1171 also has a specific shape and size to ensure that the liquid crystal module 20 can be correctly installed and positioned, i.e., the second supporting surface 1171 can be used to support the liquid crystal module 20.

[0060] The frame 11 can effectively support and fix the diaphragm assembly 2 and the liquid crystal module 20, so that the diaphragm assembly 2 and the liquid crystal module 20 are arranged in layers, and sufficient adhesive area is provided for the liquid crystal module 20 without affecting the expansion / shrinkage space of the diaphragm assembly 2, thereby significantly improving the display quality and stability of the overall display device 100.

[0061] The first support part 115 is integrally formed with the second support part 117. Specifically, the first support part 115 and the second support part 117 are manufactured as a whole through injection molding, extrusion or other appropriate molding processes. Such an integrated design not only simplifies the manufacturing and assembly process, reduces production costs, but also improves the structural stability and precision of the frame 11, thereby further improving the overall performance and stability of the display device 100.

[0062] Please refer to Figure 5 and Figure 6 , Figure 5 the second structural schematic diagram of the frame provided by the embodiments of the present application, Figure 6 the third structural schematic diagram of the frame provided by the embodiments of the present application. The fixed frame 1 further comprises a rib position 119, which is arranged on and protrudes from the first supporting surface 1151. The main function of the rib position 119 is to moderately lift the diaphragm assembly 2, thereby forming a certain height gap between the diaphragm assembly 2 and the first supporting surface 1151.

[0063] Please refer to Figures 7 to 9 , Figure 7 the fourth structural schematic diagram of the frame provided by the embodiments of the present application, Figure 8 the fifth structural schematic diagram of the frame provided by the embodiments of the present application, Figure 9 the sixth structural schematic diagram of the frame provided by the embodiments of the present application. The first support part 115 has a first inclined surface 1153, which is connected with the first supporting surface 1151 and inclined towards the direction away from the first supporting surface 1151, in other words, towards the inside of the accommodating space 111, i.e. the inside of the frame 11. The first inclined surface 1153 gradually inclines from the first supporting surface 1151 towards the inside of the accommodating space 111, i.e. the inside of the frame 11, which is ingeniously designed to surround the upper part of the light-emitting unit and / or the light guide plate and extend outward. This design not only avoids the problem of light shielding, but also realizes the dual functions of light guiding and light leakage prevention through its inclined structure, significantly increases the effective area of light, thereby improving the utilization rate of light and making the brightness distribution of the display device 100 more uniform, improving the user's visual experience.

[0064] Regarding the specific shape of the first inclined surface 1153, the embodiments of the present application provide two optional solutions: curved surface (such as Figure 7 and Figure 8 ) or folded surface (such as Figure 9 ). When the first inclined surface 1153 is a curved surface, it is preferably a smooth circular arc surface, which helps to uniformly distribute light and reduce glare and reflection, thereby further improving the display effect.

[0065] Please continue to refer to Figure 1The third inclined surface 1411 is coplanar with the first inclined surface 1153, that is, the third inclined surface 1411 can be regarded as an extension of the first inclined surface 1153. Like the effect of the first inclined surface 1153, the third inclined surface 1411 not only avoids the light blocking problem, but also realizes the dual functions of light guiding and light leakage prevention through the inclined structure, significantly increases the effective area of the light, and thus improves the utilization rate of the light.

[0066] Please continue to refer to Figure 4 The second support portion 117 also has a second inclined surface 1172, which is connected with the second bearing surface 1171 and is inclined from the second bearing surface 1171 to the direction away from the inside of the containing space 111, that is, the inside of the frame 11. The second inclined surface 1172 provides smoother and more convenient guidance during the installation of the diaphragm assembly 2.

[0067] Further, please refer to Figure 10 , Figure 10 The seventh structural schematic diagram of the frame provided by the embodiment of the present application is shown. The second support portion 117 includes a sub-connection portion 1173 and a sub-support portion 1174. The sub-connection portion 1173 is connected with the first support portion 115 and extends along the thickness direction of the frame 11. The sub-support portion 1174 is connected with the side of the sub-connection portion 1173 away from the first support portion 115. The side of the sub-support portion 1174 away from the sub-connection portion 1173 is the second bearing surface 1171. The side of the sub-support portion 1174 close to the inside of the containing space 111, that is, the inside of the frame 11 is the second inclined surface 1172.

[0068] Please refer to Figure 11 and Figure 12 , Figure 11 The eighth structural schematic diagram of the frame provided by the embodiment of the present application is shown. Figure 12 The ninth structural schematic diagram of the frame provided by the embodiment of the present application is shown. The fixed frame 1 also includes a reflective layer, which is ingeniously arranged on the inner surface of the frame 11. The reflective layer can make full use of the space advantage of the frame 11, reflect the originally blocked light to the edge of the display area 200 or the diaphragm assembly 2. This design not only effectively reduces the situation that the light is absorbed, but also significantly improves the utilization rate of the light, so that the light distribution of the display area 200 is more uniform, and the picture brightness is more consistent.

[0069] Specifically, please continue to refer to Figure 11 and Figure 12The fixed frame 1 further comprises a first reflective layer 13 disposed on the first inclined surface 1153 and / or the third inclined surface. The first inclined surface 1153 itself has helped to optimize the light conduction path, and the addition of the first reflective layer 13 further improves the utilization efficiency of light, which can reflect light to the edge of the display area 200 domain, avoiding the occurrence of shadow problem.

[0070] The first inclined surface 1153 and / or the third inclined surface itself has helped to optimize the light conduction path, and the addition of the first reflective layer 13 further improves the utilization efficiency of light, which can reflect light to the edge of the display area 200 domain, avoiding the occurrence of shadow problem. The first reflective layer 13 can be an ink layer, a plastic layer, or an aluminum layer, etc.

[0071] Please continue to refer to Figure 4 The second support part 117 also has a second inclined surface 1172 connected with the second supporting surface 1171. The second inclined surface 1172 is inclined towards the direction close to the second supporting surface 1171, in other words, the second inclined surface 1172 is inclined away from the interior of the frame 11, i.e. the containing space 111. The second inclined surface 1172 provides smoother and more convenient guidance during the installation of the membrane assembly 2. Specifically, when the membrane assembly 2 is placed on the frame 11, the second inclined surface 1172 can guide the movement of the membrane assembly 2 until it is completely placed on the first supporting surface 1151. This process not only reduces the friction and resistance during installation, but also improves the accuracy and efficiency of installation.

[0072] Specifically, please refer to Figure 13 , Figure 13 The second structure of the fixed frame provided by the embodiment of the present application is shown in the second structure diagram of the fixed frame. The fixed frame 1 further comprises a second reflective layer 15 disposed on the second inclined surface 1172. The second reflective layer 15 can reflect light, which can effectively reflect the light that may be directly absorbed or blocked by the frame 11, and guide these light to return to the membrane assembly 2. The second reflective layer 15 can be an ink layer, a plastic layer, or an aluminum layer.

[0073] Please refer to Figure 14 , Figure 14A third structure diagram of the fixing frame provided by the embodiment of the present application is shown. The fixing frame 1 further comprises a transparent block 1176 connected to the second support part 117 near the side of the containing space 111, i.e., the inside of the frame 11, and extending along the second bearing surface 1171. The transparent block 1176 can increase the area of the second bearing surface 1171, aiming to increase the effective area of the second bearing surface 1171, thereby increasing the bearing area provided for the liquid crystal module 20, and ensuring the stable fixation of the liquid crystal module 20 in the display device 100. The composition material of the transparent block 1176 can be PET (Polyethyleneterephthalate, polyterephthalate plastic) or polymethyl methacrylate (Polymethyl Methacrylate, PMMA, commonly known as organic glass).

[0074] Please refer to Figure 15 , Figure 15 A structure diagram of the display device provided by the embodiment of the present application is shown. The embodiment of the present application further provides a display device 100, which is an electronic device or component, and the core function thereof is to convert electronic signals, digital signals or other forms of signals into visual information such as images, texts, numbers and the like recognizable by human eyes. The display device 100 can be a television, a computer display, a mobile phone screen, a vehicle-mounted display screen, etc.

[0075] The display device 100 comprises a backlight module 10 and a liquid crystal module 20. The backlight module 10 is the backlight module 10 in the above-mentioned embodiment, and the liquid crystal module 20 is arranged opposite to the backlight module 10, and the liquid crystal module 20 is away from the back plate 3 of the fixing frame 1.

[0076] The edge of the back plate 3 of the backlight module 10 forms a C-shaped structure, i.e., is provided with a containing groove 33 configured to bear the diffusion plate 4. The diffusion plate 4 is arranged in the containing groove 33 to complete the fixation of the diffusion plate 4. The diffusion plate 4 is arranged between the light source and the liquid crystal module 20. The main function of the diffusion plate 4 is to uniformly diffuse the light emitted by the light source to the entire screen area, so as to improve the uniformity and brightness of the display picture.

[0077] The fixing frame 1 of the backlight module 10 is fixed on the back plate 3. The fixing frame 1 further comprises a limiting part 141 connected to the frame 11. The limiting part 141 is arranged on the side of the frame 11 near the back plate 3, and is arranged at the slot of the containing groove 33, so as to further satisfy the space required by the expansion and contraction of the diffusion plate 4.

[0078] The fixed frame 1 surrounds to form a containing space 111, i.e. the inside of the frame 11, and is provided with a groove 113 on the inner surface of the frame 11 close to the side of the containing space 111, i.e. the inside of the frame 11. The diaphragm assembly 2 can be arranged in the containing space 111, i.e. the inside of the frame 11, and arranged in the groove 113, and the liquid crystal module 20 can be connected with the end surface of the frame 11 away from the back plate 3. In other words, the liquid crystal module 20 and the diaphragm assembly 2 adopt a layered layout in this embodiment, and are not fixed in the same plane. Through the ingenious use of this layered design, sufficient fixing area is provided for the liquid crystal module 20 while ensuring that the expansion / contraction space of the diaphragm assembly 2 is not affected, thereby significantly improving the display quality and stability of the overall display device 100.

[0079] The frame 11 includes a first support part 115 having a first supporting surface 1151 and a second support part 117 connected to the first supporting surface 1151 of the first support part 115. The first support part 115 and the second support part 117 surround to form the groove 113, and the second support part 117 forms a second supporting surface 1171 away from the first support part 115. The liquid crystal module 20 is connected with the second supporting surface 1171.

[0080] In order to enhance the connection stability and reliability between the liquid crystal module 20 and the frame 11, the display device 100 further includes a first adhesive 30 arranged between the second supporting surface 1171 and the liquid crystal module 20 for fixing the liquid crystal module 20 on the frame 11. The liquid crystal module 20 is firmly fixed on the frame 11 by the adhesive force of the first adhesive 30. This fixing method is not only simple and easy to implement, but also can effectively prevent the liquid crystal module 20 from loosening or falling off during long-term use.

[0081] The first adhesive 30 can be foam glue or AB glue. Both of these materials have good adhesive properties and adaptability, can meet the needs of different occasions, and can maintain stable connection between the liquid crystal module 20 and the frame 11 for a long time. The foam glue has good adhesion and buffering properties, which can effectively reduce loosening caused by vibration or impact. The foam glue also has a certain elasticity, which can adapt to the small size changes between the liquid crystal module 20 and the frame 11. AB glue is a two-component epoxy resin adhesive that needs to be mixed before use. It has high strength, high hardness and high temperature resistance, and is suitable for occasions that need to withstand large stress and high temperature, and can maintain stable connection between the liquid crystal module 20 and the frame 11 for a long time.

[0082] The display device 100 further comprises a second adhesive member 50 arranged between the back plate 3 and the fixing frame 1, and used for fixing the fixing frame 1 on the back plate 3. The second adhesive member 50 is similar to the first adhesive member 30, and will not be described herein again. Further, the second adhesive member 50 is arranged between the second folding edge 323 of the back plate 3 and the first supporting part 115 of the frame 11, so as to realize accurate fixing.

[0083] The display device 100 further comprises a middle frame 60, which comprises a first frame part 61, a second frame part 62 and a third frame part 63. The first frame part 61 is arranged on the circumferential side of the fixing frame 1 and the back plate 3, the second frame part 62 and the third frame part 63 are connected with the first frame part 61, the first frame part 61 extends along the thickness direction of the display device 100, the second frame part 62 and the third frame part 63 extend along the direction perpendicular to the thickness direction of the display device 100, the second frame part 62 is connected with the side of the liquid crystal module 20 away from the backlight module 10, and the third frame part 63 is connected with the side of the backlight module 10 away from the liquid crystal module 20. The first frame part 61 of the middle frame 60 realizes secondary fixing of the liquid crystal module 20. The third frame part 63 can be connected with the fixing frame 1 through a bolt 70.

[0084] Further, the display device 100 further comprises a third adhesive member 80 arranged between the middle frame 60 and the liquid crystal module 20, and used for fixing the middle frame 60 on the liquid crystal module 20. The third adhesive member 80 is similar to the first adhesive member 30 and the second adhesive member 50, and will not be described herein again. Further, the third adhesive member 80 can be arranged between the liquid crystal module 20 and the second frame part 62, so as to realize accurate fixing.

[0085] In the display device 100 provided in the embodiments of the present application, the diffusion plate 4, the film assembly 2 and the liquid crystal module 20 are arranged in different spaces through the interaction between the back plate 3, the fixing frame 1 and the middle frame 60, so as to realize reasonable use of the internal space of the display device 100, and the mutual interference will not occur, that is, the display quality and the overall stability of the display device 100 with a narrow BM area are improved.

[0086] The backlight module 10 and the display device 100 provided by the embodiments of the present application, the backlight module 10 comprises a back plate 3 and a fixing frame 1, the back plate 3 comprises a main body part 31 and an extension part 32, the extension part 32 and the main body part 31 surround to form a containing groove 33, the containing groove 33 is configured to bear the diffusion plate 4. The containing groove 33 not only provides stable support for the diffusion plate 4, but also reserves enough space to meet the expansion / contraction requirement of the diaphragm assembly 2, and ensures that the diaphragm assembly 2 can maintain good working condition under various conditions. The fixing frame 1 comprises a frame 11, the frame 11 is connected with the side of the extension part 32 away from the main body part 31, and the inner surface of the frame 11 is provided with a groove 113, the groove 113 is configured to bear the diaphragm assembly 2. The backlight module 10 can improve the display quality and stability of the display device 100. The groove 113 can not only ensure the flatness and stability of the diaphragm assembly 2 after installation, but also effectively guarantee the expansion / contraction space of the diaphragm assembly 2, thereby further improving the display quality and overall stability of the display device 100.

[0087] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0088] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0089] The positioning device and the plate equipment provided by the embodiments of the present application are described in detail. In this paper, specific examples are applied to describe the principles and implementation modes of the present application, and the above description of the embodiments is only used to help understand the present application. At the same time, according to the idea of the present application, the specific implementation mode and application range will be changed by the person skilled in the art, and the above description should not be understood as the limitation of the present application.

Claims

1. A backlight module, characterized in that, The back plate comprises a main body and an extension part, the extension part and the main body form a receiving groove; The diffusion plate is lapped in the receiving groove; The fixing frame comprises a frame, the frame is connected with the extension part away from the main body, the inner surface of the frame is provided with a groove; The diaphragm assembly is lapped in the groove. The extension part comprises a lapping part, a first folding edge and a second folding edge connected in sequence, the lapping part is connected with the main body, the lapping part extends along the thickness direction perpendicular to the backlight module, the first folding edge is connected with the lapping part, the first folding edge extends along the thickness direction of the backlight module, the second folding edge extends along the thickness direction perpendicular to the backlight module, the first folding edge, the second folding edge and the lapping part form the receiving groove; the fixing frame is connected with the second folding edge.

2. The backlight module of claim 1, wherein, The fixing frame further comprises a limiting part, the limiting part is connected with the frame, the limiting part is arranged on the side of the frame close to the back plate, the limiting part is arranged at the slot opening of the receiving groove, the limiting part, the first folding edge, the second folding edge and the lapping part form the receiving groove.

3. The backlight module according to claim 1 or 2, characterized in that, The side of the limiting part away from the frame is coplanar with the side of the second folding edge close to the receiving groove.

4. The backlight module of claim 3, wherein, The limiting part and the frame form a limiting groove; the first folding edge is clamped in the limiting groove.

5. The backlight module of claim 3, wherein, The frame comprises a first support part and a second support part, the first support part has a first supporting surface; the second support part is connected on the first supporting surface of the first support part, the first support part and the second support part form the groove, the second support part away from the first support part forms a second supporting surface.

6. The backlight module of claim 3, wherein, The first support part has a first inclined surface, the first inclined surface is connected with the first supporting surface, the first inclined surface is inclined towards the direction away from the first supporting surface; the side of the limiting part away from the second folding edge is a third inclined surface, the first inclined surface is coplanar with the third inclined surface.

7. The backlight module of claim 6, wherein, The fixing frame further comprises a reflective layer, the reflective layer is arranged on the first inclined surface and / or the third inclined surface.

8. The backlight module of claim 7, wherein, The second support part further has a second inclined surface, the second inclined surface is connected with the second supporting surface, the second inclined surface is inclined towards the direction close to the second supporting surface.

9. The backlight module of claim 6, wherein, The backlight module is the backlight module of any one of claims 1 to 9; 10. A display device, characterized by comprising: The liquid crystal module is arranged opposite to the backlight module, and the liquid crystal module is connected with the side of the fixing frame away from the back plate. The frame comprises a first support part and a second support part, the first support part has a first supporting surface; the second support part is connected on the first supporting surface of the first support part, the first support part and the second support part form the groove, the second support part away from the first support part forms a second supporting surface, and the liquid crystal module is connected with the second supporting surface. ​ 11. The display device according to claim 10, wherein ​ 12. The display device of claim 10, wherein, The display device further comprises a middle frame, the middle frame comprises a first frame part, a second frame part and a third frame part, the second frame part and the third frame part are connected with the first frame part; the first frame part extends along the thickness direction of the display device, the second frame part and the third frame part extend along the direction perpendicular to the thickness direction of the display device, the second frame part is connected with the side of the liquid crystal module far from the backlight module, and the third frame part is connected with the side of the backlight module far from the liquid crystal module.

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