Backlight module and display device

Abstract

The utility model provides a backlight module. The backlight module comprises a base, a light guide plate and a middle iron frame, the base is provided with a light emitting side, a first limiting groove is formed in the side, opposite to the light emitting side, of the base, and the light guide plate is provided with a light guide plate first protruding block. First limiting pieces are arranged on the two sides, adjacent to the light emitting side, of the base, and the light guide plate is connected to the upper portions of the first limiting pieces. The middle iron frame is provided with a middle iron frame first protruding block and a middle iron frame second protruding block, and the middle iron frame first protruding block is provided with a middle iron frame inserting groove. The peripheral side edges of the light guide plate and the middle iron frame are fixed to the inner side wall of the base, the installation mode of the light guide plate and the middle iron frame is limited, the gravity of the light guide plate and the middle iron frame is dispersed, and therefore the stability of the backlight module structure is guaranteed. In addition, the utility model further provides a display device comprising the backlight module.

Description

Technical Field

[0001] The utility model belongs to the technical field of backlight sources, and in particular relates to a backlight module and a display device. Background Art

[0002] The backlight module is one of the key components of a liquid crystal display (LCD). Its main function is to provide backlight illumination for the liquid crystal panel so that the image can be clearly seen in a dark environment.

[0003] The backlight module mainly includes a light source, a light guide plate, an optical film, a middle iron frame and other auxiliary structures. In traditional technology, the light guide plate is usually directly adhered to the bottom shell of the backlight module, and the middle iron frame is wrapped around the outside of the bottom shell. In recent years, with the increasing market demand for large-size display screens, the structural dimensions of the backlight module have gradually expanded. At the same time, the weight of each structure in the backlight module, such as the light guide plate and the middle iron frame, has also increased. If the traditional limit fixing method is continued, the structural instability of the backlight module will occur.

[0004] Therefore, in order to meet the market demand for large-sized backlight modules, how to provide a backlight module with a stable structure is a problem that people in the relevant technical field need to solve. Utility Model Content

[0005] In order to solve the deficiencies of the prior art, the utility model provides a backlight module, which disperses the gravity of the light guide plate and the middle iron frame by limiting the installation method of the light guide plate and the middle iron frame, thereby ensuring the stability of the backlight module structure.

[0006] The technical effects to be achieved by the utility model are achieved through the following technical aspects:

[0007] In a first aspect, the utility model provides a backlight module, comprising a base, a light guide plate installed inside the base, and a middle iron frame;

[0008] The base is provided with a light emitting side for mounting a light source,

[0009] On the side opposite to the light emitting side, the inner side wall of the base is provided with a plurality of first limiting grooves, the light guide plate is provided with a plurality of first light guide plate protrusions, and the first light guide plate protrusions are plugged into the first limiting grooves;

[0010] On the two sides adjacent to the light emitting side, the inner side walls of the base are provided with a plurality of first position-limiting members, and the light guide plate is connected above the first position-limiting members;

[0011] The side of the middle iron frame is connected to the inner side wall of the base, and the base is provided with a plurality of second limit grooves and a third limit groove, the bottom surface of the second limit groove is parallel to the bottom surface of the base, and at least one of the second limit grooves is provided with a first limit column, and the first limit column extends along the direction away from the bottom surface of the base; each side of the middle iron frame is provided with a first middle iron frame protrusion and a second middle iron frame protrusion, and at least one of the first middle iron frame protrusions is provided with a middle iron frame insertion groove, the first middle iron frame protrusion is connected to the second limit groove, and the middle iron frame insertion groove is sleeved outside the first limit column, and the second middle iron frame protrusion is clamped in the third limit groove.

[0012] In some embodiments, the first limiting groove is provided with a second limiting member, the first protrusion of the light guide plate is inserted into the first limiting groove through the second limiting member, and the first limiting member and the second limiting member are silicone members.

[0013] In some embodiments, a reflective film is further included between the light guide plate and the base, the light guide plate is fixed to the reflective film, and the light guide plate is connected to the bottom surface of the base through the reflective film.

[0014] In some embodiments, on the light emitting side, a light guide plate fixing glue is provided between the reflective film and the light guide plate, and the light guide plate fixing glue is provided with a plurality of glue reduction areas corresponding to the light source lamp beads.

[0015] In some embodiments, at the light emitting side, the inner side wall of the base is further provided with a first step, the first step is parallel to the bottom surface of the base, and the middle iron frame is connected and fixed above the first step.

[0016] In some embodiments, it also includes a diaphragm assembly located between the middle iron frame and the light guide plate, and the diaphragm assembly includes a plurality of diaphragms.

[0017] In some embodiments, on the light-emitting side, the diaphragm is provided with a first diaphragm protrusion, the first diaphragm protrusion is provided with a diaphragm plug-in groove, the inner side wall of the base is provided with a fourth limiting groove and a second limiting column, the first diaphragm lug is plugged into the fourth limiting groove, and the second limiting column passes through the diaphragm plug-in groove;

[0018] The diaphragm is provided with a second diaphragm protrusion on a side opposite to the light emitting side, the inner side wall of the base is provided with a fifth limiting groove, and the second diaphragm protrusion is plugged into the fifth limiting groove.

[0019] In some embodiments, the fifth limiting groove is provided with a third limiting member, the third limiting member is a silicone member, and the second protrusion of the diaphragm is limited at the third limiting member.

[0020] In some embodiments, the middle iron frame is further provided with a limiting hole, and the middle iron frame is sleeved outside the second limiting column through the limiting hole.

[0021] In a second aspect, a display device is also provided, comprising any of the above-mentioned backlight modules.

[0022] In summary, the utility model has at least the following benefits:

[0023] 1. The backlight module provided by the utility model disperses the gravity of the light guide plate and the middle iron frame by limiting the installation method of the light guide plate and the middle iron frame. The light guide plate is connected to the inner side wall around the base through a plurality of first light guide plate protrusions and a first limiter, and the middle iron frame is connected to the inner side wall around the base through staggered first middle iron frame protrusions and second middle iron frame protrusions, thereby achieving the effect of dispersing gravity, reducing the problem of deformation or easy falling of the light guide plate and the middle iron frame, and ensuring the stability of the backlight module structure.

[0024] 2. The display device provided by the utility model can have a large size and a stable structure through a backlight module with a specific installation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0026] Figure 2 This is a schematic diagram of the exploded structure of the light guide plate and the base of Example 1 of the utility model;

[0027] Figure 3 for Figure 2 A partial enlarged schematic diagram of part a;

[0028] Figure 4 This is a schematic diagram of the structure of the base of Example 1 of the utility model;

[0029] Figure 5 for Figure 4 A partial enlarged schematic diagram of part b;

[0030] Figure 6 for Figure 2 A partial enlarged schematic diagram of part c;

[0031] Figure 7 This is a schematic structural diagram of the middle iron frame of Example 1 of the utility model;

[0032] Figure 8 for Figure 7 A partial enlarged schematic diagram of part d in the middle;

[0033] Fig. 9 for Figure 2A partial enlarged schematic diagram of part e;

[0034] Fig.10 This is a schematic diagram of the overall structure of Embodiment 2 of the present utility model;

[0035] Fig.11 This is a schematic diagram of the diaphragm structure of Example 2 of the utility model;

[0036] Fig.12 for Fig.11 A partial enlarged schematic diagram of part h in the middle;

[0037] Fig.13 This is a schematic diagram of the base structure of Example 2 of the utility model;

[0038] Fig.14 for Fig.13 A partial enlarged schematic diagram of part f in the middle;

[0039] Fig.15 for Fig.13 A partial enlarged schematic diagram of part g in the middle;

[0040] Fig.16 for Fig.11 A partial enlarged schematic diagram of part i in the middle;

[0041] Fig.17 for Fig.11 A partial enlarged schematic diagram of part j in the middle;

[0042] Fig.18 Another structural schematic diagram of the base of Example 2 of the utility model;

[0043] Fig.19 for Fig.18 A local enlarged schematic diagram of the middle k part;

[0044] Fig. 20 It is a partial cross-sectional view of the backlight module after assembly according to Embodiment 2 of the utility model.

[0045] Markings in the figure:

[0046] 10. light exit side; 20. first side wall; 30. second side wall; 40. third side wall;

[0047] 1. Base; 11. First limiting groove; 12. First limiting member; 13. Second limiting member; 14. Second limiting groove; 141. First limiting column; 142. Second limiting groove fixing glue; 15. Third limiting groove; 161. Middle iron frame fixing glue; 17. Fourth limiting groove; 171. Second limiting column; 18. Fifth limiting groove; 181. Third limiting member;

[0048] 2. light guide plate; 21. first convex block of the light guide plate;

[0049] 3. middle iron frame; 31. first protrusion of the middle iron frame; 311. insertion slot of the middle iron frame; 32. second protrusion of the middle iron frame;

[0050] 4. Reflective film; 41. Light guide plate fixing glue; 42. Glue reduction area;

[0051] 5. Diaphragm; 51. First convex block of diaphragm; 511. Diaphragm insertion groove; 52. Second convex block of diaphragm. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. The described implementation is a part of the implementation of the utility model, not all of the implementations.

[0053] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0054] Embodiment 1:

[0055] Please see attached Figure 1-9 The backlight module of the utility model comprises a base 1, a light guide plate 2 installed inside the base 1 and a middle iron frame 3.

[0056] like Figures 2 to 6 As shown, the surrounding side walls of the light guide plate 2 are connected to the inner side walls of the base 1. Specifically, the inner side wall of one side of the base 1 is used to install a light source, and this side is the light emitting side 10. On the side away from the light emitting side 10, that is, the side opposite to the light emitting side 10, the light guide plate 2 is provided with a plurality of raised light guide plate first protrusions 21, and the light guide plate first protrusions 21 extend in the direction of the side wall of the base 1. Correspondingly, the base 1 is provided with a first limiting groove 11 on the side away from the light emitting side 10, and the light guide plate first protrusion 21 is plugged into the first limiting groove 11 to achieve preliminary fixation of the light guide plate 2. In this embodiment, the light guide plate 2 is provided with four light guide plate first protrusions 21 on the side away from the light emitting side 10, and the number of the first limiting grooves 11 of the base 1 is adapted to the first light guide plate protrusions 21.

[0057] Furthermore, at least one first stopper 12 is connected to the inner side wall of the base 1 on both sides adjacent to the light-emitting side 10, and the first stopper 12 is in the shape of a letter "I". When the light guide plate 2 is installed, the light guide plate 2 is connected to the upper part of the first stopper 12. So far, the light guide plate 2 is connected to the inner side wall of the base 1 through a plurality of first light guide plate protrusions 21 on the side opposite to the light-emitting side 10, and is connected to the inner side wall of the base 1 through the first stopper 12 on both sides adjacent to the light-emitting side 10. At the same time, the gravity is evenly dispersed by the first light guide plate protrusions 21 and the first stopper 12, thereby avoiding deformation of the connection between the light guide plate 2 and the base 1 due to uneven force.

[0058] In some embodiments, in order to increase the stability of the light guide plate 2 structure and enhance the buffering effect, a second limiting member 13 is disposed in the first limiting groove 11. Figure 5 The second stopper 13 is provided with a groove for plugging with the first projection 21 of the light guide plate, and the first projection 21 of the light guide plate is plugged into the first stopper groove 11 through the second stopper 13. The second stopper 13 is a silicone member. The first projection 21 of the light guide plate can be connected with the second stopper 13 by interference fit.

[0059] In some embodiments, a reflective film 4 is further provided between the light guide plate 2 and the base 1. Figure 3 , the light guide plate 2 is fixedly connected to the reflective film 4, and is fixed to the inner bottom surface of the base 1 through the reflective film 4. In this embodiment, the light guide plate 2 and the reflective film 4 are fixed by gluing. In particular, in order to ensure the optical effect, a light guide plate fixing glue 41 is provided between the reflective film 4 and the light guide plate 2 on the light-emitting side 10. The light guide plate fixing glue 41 is provided with a plurality of glue reduction areas 42, and the positions of the glue reduction areas 42 correspond to the lamp beads of the light source distribution. In this embodiment, the glue reduction area 42 is a "U"-shaped concave as a whole to avoid the lamp mouth, so as to prevent the backlight module from having uneven brightness in the presence of the light guide plate fixing glue 41, so as to improve the optical effect in front of the lamp, thereby ensuring the consistency of the overall optical effect of the backlight module. It can be understood that, at other sides except the light-emitting side 10, a light guide plate fixing glue 41 may also be provided between the reflective film 4 and the light guide plate 2, and the light guide plate fixing glue 41 here may not be provided with a glue reduction area 42.

[0060] The middle iron frame 3 is located above the light guide plate 2. The side of the middle iron frame 3 is connected to the inner side wall of the base 1. Figure 2 , Figures 7 to 9, the sides of the middle iron frame 3 are provided with a first middle iron frame protrusion 31 and a second middle iron frame protrusion 32 extending toward the side wall of the base 1. The first middle iron frame protrusion 31 and the second middle iron frame protrusion 32 are arranged in an interlaced manner. It can be understood that the interlaced arrangement here is not a strict alternating arrangement, and in some embodiments, the first middle iron frame protrusion 31 and the second middle iron frame protrusion 32 can be adjusted according to demand. In this embodiment, the first middle iron frame protrusion 31 is formed by the edge of the middle iron frame 3 protruding in the direction away from the base 1, and then bending in a direction parallel to the bottom surface of the base 1. In addition, some of the first middle iron frame protrusions 31 are provided with a middle iron frame insertion groove 311. Correspondingly, a plurality of second limiting grooves 14 are provided on the inner side wall of the base 1, and the bottom surface of the second limiting groove 14 is parallel to the bottom surface of the base 1, and at least one second limiting groove 14 is provided with a first limiting column 141. The first limiting column 141 protrudes in the direction away from the bottom surface of the base 1. When the middle iron frame 3 is installed inside the base 1, the first protrusion 31 of the middle iron frame is connected to the second limiting groove 14, and the middle iron frame insertion groove 311 is sleeved outside the first limiting column 141 to achieve the initial fixation of the middle iron frame 3. In this embodiment, different second limiting grooves 14 are provided with first limiting columns 141 at intervals.

[0061] Furthermore, a second limiting groove fixing glue 142 may be provided between the first protrusion 31 of the middle iron frame and the bottom surface of the second limiting groove 14 to connect the first protrusion 31 of the middle iron frame and the second limiting groove 14 .

[0062] The second protrusion 32 of the middle iron frame is snap-fitted to the base 1. In this embodiment, the inner side wall of the base 1 is provided with a concave third limiting groove 15, and the second protrusion 32 of the middle iron frame extends from the edge of the middle iron frame 3 toward the inner side wall of the base 1, and the end is tilted away from the bottom surface of the base 1 to facilitate snapping with the third limiting groove 15. It can be understood that this is not a specific structure that limits the snap-fitting connection between the second protrusion 32 of the middle iron frame and the third limiting groove 15.

[0063] When the middle iron frame 3 is installed, it is connected to the inner side walls around the base 1 through the first middle iron frame protrusion 31 and the second middle iron frame protrusion 32, and the gravity is evenly dispersed to prevent the middle iron frame 3 from being deformed or easily falling off.

[0064] In order to further enhance the stability of the structure when the middle iron frame 3 is installed, in some embodiments, the inner side wall of the base 1 may also be provided with a first step. The middle iron frame 3 is connected above the first step. In this embodiment, the first step is provided on the light-emitting side 10 of the base 1, and the first step is parallel to the bottom surface of the base 1. After the middle iron frame 3 is installed through the first middle iron frame protrusion 31 and the second middle iron frame protrusion 32, it is connected as a whole above the first step. A middle iron frame fixing glue 161 is provided between the first step and the middle iron frame 3, and the middle iron frame 3 is bonded to the first step through the middle iron frame fixing glue 161.

[0065] In summary, this embodiment provides a backlight module. Among them, the light guide plate 2 and the middle iron frame 3 are connected to the inner side wall of the base 1 on all sides so as to be installed inside the base 1. Specifically, the light guide plate 2 is connected to the inner side wall of the base 1 on all sides through a plurality of first light guide plate protrusions 21 and a first stopper 12, and the middle iron frame 3 is connected to the inner side wall of the base 1 on all sides through staggered first middle iron frame protrusions 31 and second middle iron frame protrusions 32, thereby achieving the effect of dispersing gravity, reducing the problem of deformation or easy falling off of the light guide plate 2 and the middle iron frame 3, and ensuring the stability of the backlight module structure.

[0066] Embodiment 2:

[0067] The difference between this embodiment and embodiment 1 is that this embodiment further optimizes the structure of the backlight module of the utility model. Figures 10 to 19 .

[0068] The backlight module of this embodiment also includes a diaphragm assembly disposed between the light guide plate 2 and the middle iron frame 3. The diaphragm assembly includes a plurality of diaphragms 5. In this embodiment, along the direction from the light guide plate 2 to the middle iron frame 3, the diaphragms 5 are respectively a diffuser film, a lower light enhancement film, a middle light enhancement film and a DBEF. Different diaphragms 5 are bonded by a diaphragm 5 fixing glue. It can be understood that the number and type of diaphragms 5 are not limited here, and can be adjusted in different embodiments.

[0069] Further, on the light-emitting side 10, the diaphragm 5 is provided with a first diaphragm protrusion 51 extending toward the inner side wall of the base 1. The first diaphragm protrusion 51 is provided with a diaphragm insertion groove 511. Correspondingly, the inner side wall of the base 1 is provided with a fourth limiting groove 17 and a second limiting column 171. In the present embodiment, part of the second limiting column 171 is formed by extending from the bottom surface of the fourth limiting groove 17 in a direction away from the bottom surface of the base 1. There is also another part of the second limiting column 171 extending upward from the bottom surface of the base 1 and formed along the bottom surface of the fourth limiting groove 17 near the edge of the inside of the base 1. It can be understood that the specific position of the second limiting column 171 is not limited here. The second limiting column 171 is mainly used for limiting the diaphragm 5. Therefore, in some embodiments, the position and structure of the second limiting column 171 can be adjusted accordingly.

[0070] During installation, the first diaphragm protrusion 51 is inserted into the fourth limiting groove 17, and the second limiting column 171 connected to the fourth limiting groove 17 passes through the diaphragm insertion groove 511. Thus, the side walls around the diaphragm 5 are inserted and fixed to the inner side wall of the base 1, and the limiting in different directions is achieved.

[0071] In particular, in this embodiment, the structures of the first diaphragm protrusion 51 and the diaphragm insertion groove 511 are not completely uniform. The first diaphragm protrusions 51 of the diaphragm 5 at the two ends of the light-emitting side 10 are bent. Specifically, after the edge of the diaphragm 5 extends toward the inner side wall of the base 1, it turns in a direction parallel to the side of the diaphragm 5 and forms a "U"-shaped diaphragm insertion groove 511. When the diaphragm 5 is fixed, the second limiting column 171 is engaged in the diaphragm insertion groove 511.

[0072] Except for the first diaphragm bumps 51 at the two ends of the light-emitting side 10 , the other first diaphragm bumps 51 are in a sheet-like structure, and the diaphragm insertion groove 511 is arranged in the center of the first bump, forming a "mouth" shape.

[0073] It is understandable that this is not the only specific limitation on the structure of the first diaphragm protrusion 51. In some embodiments, the structures of the first diaphragm protrusion 51 and the diaphragm insertion groove 511 may also be unified.

[0074] On the side opposite to the light emitting side 10, the diaphragm 5 is provided with a second diaphragm protrusion 52, which protrudes from the side of the diaphragm 5 toward the inner side wall of the base 1. Correspondingly, the inner side wall of the base 1 is provided with a concave fifth limiting groove 18. The second diaphragm protrusion 52 is inserted into the fifth limiting groove 18.

[0075] In this embodiment, a third limiting member 181 is provided in the fifth limiting groove 18, and the third limiting member 181 is provided with a "U"-shaped limiting portion, and the opening of the limiting portion is close to the side where the middle iron frame 3 is located. The second diaphragm protrusion 52 is limited at the limiting portion. Among them, the third limiting member 181 is a silicone member.

[0076] Fig. 20 A cross-sectional view of the backlight module is given. Figures 10 to 20 The diaphragm 5 is inserted into the inner wall of the base 1 through the first diaphragm protrusion 51 and the second diaphragm protrusion 52 , and is limited between the middle iron frame 3 and the light guide plate 2 .

[0077] In particular, the middle iron frame 3 is also provided with a limiting hole, and the position of the limiting hole corresponds to the second limiting column 171 used to limit the diaphragm 5. When the light guide plate 2, the diaphragm assembly and the middle iron frame 3 are installed inside the base 1, the limiting hole of the middle iron frame 3 is nested on the outside of the second limiting column 171, further strengthening the structural stability between the diaphragm assembly and the middle iron frame 3 and the base 1.

[0078] This embodiment further defines the installation structure of the diaphragm assembly, thereby reducing the possibility of deformation of the light guide plate 2, the diaphragm assembly and the middle iron frame 3, and improving the overall structural strength of the backlight module.

[0079] Embodiment 3:

[0080] Based on the above embodiments, this embodiment provides a display device, which includes a backlight module. The backlight module can be the backlight module provided in Embodiment 1 or Embodiment 2, or it can be an improved backlight module based on Embodiment 1 or Embodiment 2. No specific restrictions are made here.

[0081] The display device provided in this embodiment makes specific restrictions on the installation structure of the light guide plate 2 and the middle iron frame 3 in the backlight module, so that the gravity of the light guide plate 2 and the middle iron frame 3 is evenly dispersed, thereby ensuring that the large-sized display device has a stable structure.

[0082] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0084] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0085] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0086] Although the utility model is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A backlight module, characterized in that: include: A base (1), a light guide plate (2) installed inside the base (1), and a middle iron frame (3); The base (1) is provided with a light emitting side (10) for mounting a light source. On the side opposite to the light emitting side (10), the inner side wall of the base (1) is provided with a plurality of first limiting grooves (11), the light guide plate (2) is provided with a plurality of first light guide plate protrusions (21), and the first light guide plate protrusions (21) are plugged into the first limiting grooves (11); On the two sides adjacent to the light emitting side (10), the inner side walls of the base (1) are provided with a plurality of first position-limiting members (12), and the light guide plate (2) is connected above the first position-limiting members (12); The side of the middle iron frame (3) is connected to the inner side wall of the base (1); the base (1) is provided with a plurality of second limiting grooves (14) and a third limiting groove (15); the bottom surface of the second limiting groove (14) is parallel to the bottom surface of the base (1), and at least one of the second limiting grooves (14) is provided with a first limiting column (141), and the first limiting column (141) extends along a direction away from the bottom surface of the base (1); each side of the middle iron frame (3) is provided with a middle iron frame first protrusion (31) and a middle iron frame second protrusion (32), and at least one of the middle iron frame first protrusion (31) is provided with a middle iron frame plug-in groove (311), the middle iron frame first protrusion (31) is connected to the inside of the second limiting groove (14), and the middle iron frame plug-in groove (311) is sleeved outside the first limiting column (141), and the middle iron frame second protrusion (32) is clamped in the third limiting groove (15).

2. The backlight module according to claim 1, characterized in that: The first limiting groove (11) is provided with a second limiting piece (13), the first projection (21) of the light guide plate is inserted into the first limiting groove (11) via the second limiting piece (13), and the first limiting piece (12) and the second limiting piece (13) are silicone pieces.

3. The backlight module according to claim 1, characterized in that: It also comprises a reflective film (4) arranged between the light guide plate (2) and the base (1), the light guide plate (2) and the reflective film (4) are fixed, and the light guide plate (2) is connected to the bottom surface of the base (1) via the reflective film (4).

4. The backlight module according to claim 3, characterized in that: On the light-emitting side (10), a light guide plate fixing glue (41) is provided between the reflective film (4) and the light guide plate (2), and the light guide plate fixing glue (41) is provided with a plurality of glue reduction areas (42) corresponding to light source lamp beads.

5. The backlight module according to claim 1, characterized in that: On the light-emitting side (10), the inner side wall of the base (1) is also provided with a first step, the first step is parallel to the bottom surface of the base (1), and the middle iron frame (3) is connected and fixed above the first step.

6. The backlight module according to claim 1, characterized in that: It also comprises a diaphragm assembly located between the middle iron frame (3) and the light guide plate (2), wherein the diaphragm assembly comprises a plurality of diaphragms (5).

7. The backlight module according to claim 6, characterized in that: On the light-emitting side (10), the diaphragm (5) is provided with a first diaphragm protrusion (51), the first diaphragm protrusion (51) is provided with a diaphragm insertion groove (511), the inner side wall of the base (1) is provided with a fourth limiting groove (17) and a second limiting column (171), the first lug of the diaphragm (5) is plugged into the fourth limiting groove, and the second limiting column (171) passes through the diaphragm insertion groove (511); On the side opposite to the light emitting side (10), the diaphragm (5) is provided with a second diaphragm protrusion (52), the inner side wall of the base (1) is provided with a fifth limiting groove (18), and the second diaphragm protrusion (52) is inserted into the fifth limiting groove (18).

8. The backlight module according to claim 7, characterized in that: The fifth limiting groove (18) is provided with a third limiting member (181), the third limiting member (181) is a silicone member, and the second convex block (52) of the diaphragm is limited at the third limiting member (181).

9. The backlight module according to claim 7, characterized in that: The middle iron frame (3) is also provided with a limiting hole, and the middle iron frame (3) is sleeved outside the second limiting column (171) through the limiting hole.

10. A display device, characterized in that: The invention comprises the backlight module described in any one of claims 1 to 9.

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