CN110033697B - Backlight module and display device - Google Patents

Abstract

The embodiment of the application provides a backlight module and a display device, wherein the backlight module comprises a back plate component and a circuit board component; the circuit board assembly comprises a circuit board body and a reinforcing part connected to one side of the circuit board body; a fixing groove is arranged in the bottom plate of the back plate component; one part of the circuit board body or the reinforcing part is arranged in the fixing groove, and the other part of the circuit board body or the reinforcing part is attached and connected with the part of the bottom plate except the fixing groove. In the backlight module, the movement of the circuit board body in any direction in the space is limited, so that the stability of the connection between the circuit board body and the backboard component is improved, the circuit board body can bear larger impact force, and the risk of poor phenomena such as uneven brightness, light leakage and the like of the backlight module is reduced.

Description

Backlight module and display device

technical field

The present application relates to the technical field of display devices, and in particular, the present application relates to a backlight module and a display device.

Background technique

In a backlight module of a display device, the circuit board is used for electrical connection with a light-emitting body (such as a light-emitting diode) to control the working state of the light-emitting body. In the prior art, the circuit board is generally only pasted on the bottom plate of the backplane member by adhesive tape. When the display device is impacted (such as performing a strength test of the product or falling to the ground outside of use, etc.), the display device will endure relatively Large impact force, the impact force exceeds the adhesive force of the tape, causing the circuit board to move relative to the backplane member, and even lead to the separation of the circuit board and the backplane member in severe cases, resulting in uneven brightness and light leakage in the display device. unpleasant sight.

To sum up, the prior art has the defect that the connection between the circuit board and the backplane member in the backlight module is unstable.

SUMMARY OF THE INVENTION

Aiming at the shortcomings of the prior art, the present application proposes a backlight module and a display device to solve the technical problems existing in the prior art.

In the first aspect, the embodiments of the present application provide a backlight module, including a backplane member and a circuit board assembly; the circuit board assembly includes a circuit board body and a reinforcing portion connected to one side of the circuit board body; A fixing groove is arranged in the bottom plate; a part of the circuit board body or the reinforcing part is arranged in the fixing groove, and the other part is attached and connected with the part outside the fixing groove in the bottom plate.

In a second aspect, the embodiments of the present application provide a display device including the backlight module provided by the embodiments of the present application.

The beneficial technical effects brought by the technical solutions provided in the embodiments of the present application are:

In the backlight module provided by the embodiment of the present application, when a part of the circuit board body is arranged in the fixing groove, the reinforcing part is attached and connected to the part outside the fixing groove in the base plate; when the reinforcing part is arranged in the fixing groove, A part of the circuit board body is attached and connected with the part outside the fixing groove in the bottom plate.

Taking the reinforcement part arranged in the fixing slot as an example, the side of the fixing slot can limit the movement of the reinforcement part in the direction parallel to the bottom plate. The movement of the body in the direction parallel to the base plate; in addition, the circuit board body is also attached to the base plate, which limits the movement of the circuit board body in the direction perpendicular to the base plate. It can be seen that, in the backlight module provided by the embodiments of the present application, the movement of the circuit board body in any direction in space is restricted, which improves the stability of the connection between the circuit board body and the backplane member, so that the circuit board body can be It can withstand a large impact force, reducing the risk of uneven brightness and light leakage of the backlight module.

Additional aspects and advantages of the present application will be set forth in part in the following description, which will become apparent from the following description, or may be learned by practice of the present application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a schematic structural diagram of a backlight module provided by an embodiment of the present application;

2 is an assembly diagram of a circuit board assembly and a backplane member provided by an embodiment of the present application;

3 is a schematic structural diagram of a circuit board assembly provided by an embodiment of the present application;

4 is a schematic structural diagram of a backplane member provided by an embodiment of the present application;

5 is a schematic structural diagram of another backlight module provided by an embodiment of the present application;

In the picture:

1-back plate member;

11-bottom plate; 111-first plate; 112-second plate; 113-transition structure;

12-side board; 13-top board; 2-circuit board body;

3-reinforcing part; 4-fixing groove; 5-first tape; 6-light-emitting body;

7-light guide assembly; 71-reflection sheet; 72-light guide plate;

73-optical film layer group; 731-diffusion sheet; 732-lower polarizer; 733-upper polarizer;

74-diffusion tape; 75-reflector tape;

8-shading tape; 9-mylar film; 10-gasket.

Detailed ways

The application is described in detail below, and examples of embodiments of the application are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. Also, detailed descriptions of known technologies are omitted if they are not necessary for illustrating features of the present application. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, but not to be construed as a limitation on the present application.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms, such as those defined in a general dictionary, should be understood to have meanings consistent with their meanings in the context of the prior art and, unless specifically defined as herein, should not be interpreted in idealistic or overly formal meaning to explain.

It will be understood by those skilled in the art that the singular forms "a", "an", "the" and "the" as used herein can include the plural forms as well, unless expressly stated otherwise. It should be further understood that the word "comprising" used in the description of the present application refers to the presence of the stated features, integers, steps, operations, elements and/or components, but does not preclude the presence or addition of one or more other features, Integers, steps, operations, elements, components and/or groups thereof. As used herein, the term "and/or" includes all or any element and all combination of one or more of the associated listed items.

The technical solutions of the present application and how the technical solutions of the present application solve the above-mentioned technical problems will be described in detail below with specific examples.

The embodiments of the present application provide a backlight module, as shown in FIG. 1 to FIG. 5 , including a backplane member 1 and a circuit board assembly. The circuit board assembly includes a circuit board body 2 and a reinforcing portion 3 connected to one side of the circuit board body 2 . A fixing groove 4 is provided in the bottom plate 11 of the back plate member 1 . A part of the circuit board body 2 or the reinforcing part 3 is disposed in the fixing groove 4 , and the other part is attached and connected to the part of the bottom plate 11 outside the fixing groove 4 .

In the backlight module provided by the embodiment of the present application, when a part of the circuit board body 2 is arranged in the fixing groove 4, the reinforcing part 3 is attached and connected to the part outside the fixing groove 4 in the bottom plate 11; When in the fixing slot 4 , a part of the circuit board body 2 is attached and connected to the part of the bottom plate 11 outside the fixing slot 4 .

Taking the reinforcing part 3 arranged in the fixing groove 4 as an example, the side surface of the fixing groove 4 can limit the movement of the reinforcing part 3 in the direction parallel to the bottom plate 11. Since the circuit board body 2 and the reinforcing part 3 are connected to form a whole, so It also limits the movement of the circuit board body 2 in the direction parallel to the bottom plate 11 ; in addition, the circuit board body 2 is also attached to the bottom plate 11 , which limits the movement of the circuit board body 2 in the direction perpendicular to the bottom plate 11 . It can be seen that, in the backlight module provided by the embodiment of the present application, the movement of the circuit board body 2 in any direction in space is restricted, which improves the stability of the connection between the circuit board body and the backplane member 1, and makes the circuit board The main body 2 can withstand a large impact force, which reduces the risk of uneven brightness and light leakage of the backlight module.

Those skilled in the art should understand that the back plate member 1 includes a bottom plate 11, a side plate surrounding the bottom plate 11, and a top plate 13 opposite to the bottom plate 11, since the drawings in the embodiments of the present application only show a part of the backlight assembly The structure and the accompanying drawings are all sectional views, and the sectional plane is parallel to the first direction of the bottom plate 11 and perpendicular to the bottom plate 11 , so only one of the side plates 12 is shown in the drawings.

Optionally, in the backlight module provided by the embodiment of the present application, as shown in FIG. 1 to FIG. 4 , the fixing groove 4 is formed by bending the bottom plate 11 . Along the first direction of the bottom plate 11 , the size of the circuit board body 2 is larger than that of the reinforcing portion 3 . The shape of the fixing groove 4 matches the shape of the reinforcing part 3 , and the reinforcing part 3 is embedded in the fixing groove 4 . The part of the circuit board body 2 beyond the reinforcement part 3 is attached and connected to the part of the bottom plate 11 except the fixing groove 4 .

Since the shape of the fixing groove 4 matches the shape of the reinforcing part 3, there is only a very small gap or mutual fit between the side surface of the reinforcing part 3 and the side surface of the fixing groove 4, which enables the side surface of the fixing groove 4 to limit the reinforcement Movement of the part 3 in a direction parallel to the base plate 11 .

It should be noted that the bottom plate 11 is substantially rectangular, and the first direction of the bottom plate 11 may be the length direction or the width direction of the bottom plate 11 . Taking FIG. 1 and FIG. 5 as examples, in the embodiment of the present application, the first direction of the bottom plate 11 It goes left and right.

Taking FIG. 4 as an example, after the bottom plate 11 is bent, a concave part will appear, the concave part is lower than other parts of the bottom plate 11 , and the concave part is close to the side plate 12 . at this time. The recessed part of the bottom plate 11 , the side plate 12 , the two side plates (not shown in the figure) that are parallel to the first direction and adjacent to the side plate 12 , and the transition structure 113 between the recessed part and other parts of the bottom plate 11 are enclosed into a fixing groove 4. Of course, the fixing groove 4 can also be formed in other ways. For example, the bottom plate 11 is bent by punching, and a depression is formed in the punched bottom plate 11 , and the depression is used as the fixing groove 4 .

In FIGS. 1 and 2 , the reinforcing portion 3 is disposed below the circuit board body 2 and embedded in the fixing groove 4 , and the circuit board body 2 extends beyond the reinforcing portion 3 on the left and right sides of the reinforcing portion 3 . The portion of the circuit board body 2 on the right side of the reinforcement portion 3 is attached and connected to the portion on the right side of the fixing groove 4 in the bottom plate 11 .

Optionally, in the backlight module provided by the embodiment of the present application, as shown in FIG. 4 , the bent bottom plate 11 includes a first board member 111 and a second board member 112 . The first plate 111 and the second plate 112 are adjacent and connected along the first direction. The inner surface of the first plate 111 is lower than the inner surface of the second plate 112 , and the inner surface of the first plate 111 is the bottom surface of the fixing groove 4 . The transition between the first plate 111 and the second plate 112 The structure 113 is one side surface of the fixing groove 4 . The portion of the circuit board body 2 beyond the reinforcement portion 3 is attached and connected to the inner surface of the second board member 112 .

It should be noted that, in the figure, the inner surface of the first plate 111 and the inner surface of the second plate 112 are the upper surfaces of the first plate 111 and the second plate 112 respectively, and the surface faces the back plate Inside of member 1.

Taking FIG. 4 as an example, after the bottom plate 11 is bent twice at 90 degrees, a first plate 111 inclined downward and a second plate 112 inclined upward are formed, and the first plate 111 and the second plate 112 pass through. The transition structure 113 is connected. The junctions of the first plate member 111 and the second plate member 112 and the transition structure 113 are respectively two bending lines. The first plate 111 , the side plate 12 , two side plates (not shown in the figure) that are parallel to the first direction and adjacent to the side plate 12 , and the transition structure 113 enclose the fixing groove 4 . The inner surface of the first plate member 111 is the bottom surface of the fixing groove 4 , and the portion of the circuit board body 2 on the right side of the reinforcement portion 3 is attached to the inner surface of the second plate member 112 .

Optionally, as shown in FIG. 1 , the backlight module provided in this embodiment of the present application further includes a first adhesive tape 5 . The portion of the circuit board body 2 extending beyond the reinforcement portion 3 in the first direction is attached and connected to the inner surface of the second board member 112 through the first adhesive tape 5 . The first adhesive tape 5 is respectively attached to the second board 112 and the circuit board body 2 , so that the circuit board body 2 and the second board 112 are connected.

Optionally, in the backlight module provided by the embodiment of the present application, as shown in FIG. 1 , the bottom surface of the reinforcing portion 3 is attached to the inner surface of the first plate member 111 , and the bottom surface of the first adhesive tape 5 is attached to the second plate member. The inner surface of 112 fits. The top surface of the reinforcement portion 3 is flush with the top surface of the first adhesive tape 5 , and both are attached to the circuit board body 2 .

It should be noted that the surface of the reinforcement portion 3 facing the bottom plate 11 is the bottom surface, and the surface facing away from the bottom surface is the top surface; similarly, the surface of the first adhesive tape 5 facing the bottom plate 11 is the bottom surface, and the surface facing away from the bottom surface is the top surface. After the reinforcing part 3 is placed in the fixing groove 4, the top surface of the reinforcing part 3 is higher than the inner surface of the second plate 112, and the height difference between the top surface of the reinforcing part 3 and the inner surface of the second plate 112 is the same as that of the second plate 112. The thicknesses of the two adhesive tapes are equal, that is, the top surface of the reinforcing part 3 is flush with the top surface of the first adhesive tape 5 . The above arrangement can ensure the flatness of the circuit board body 2 and avoid damage to the circuit board body 2 .

Optionally, in the backlight module provided by the embodiment of the present application, as shown in FIG. 5 , the fixing groove 4 is a through groove penetrating through the bottom plate 11 . Along the first direction of the bottom plate 11 , the size of the circuit board body 2 is smaller than that of the reinforcing portion 3 . The shape of the fixing slot 4 matches the shape of the clip-in portion of the circuit board body 2 , and the clip-in portion of the circuit board body 2 is located in the through slot. The reinforcement portion 3 is located on the outer side of the backplane member 1 , and the portion of the reinforcement portion 3 that extends beyond the circuit board body 2 is attached and connected to the portion of the bottom plate 11 except for the through groove.

Since the shape of the snap-in portion of the solid circuit board body 2 matches the shape of the reinforcement portion 3 , there is only a very small gap or gap between the side surface of the portion of the circuit board body 2 located in the fixing groove 4 and the side surface of the fixing groove 4 . The sides of the fixing groove 4 can limit the movement of the circuit board body 2 in the direction parallel to the bottom plate 11 .

It should be noted that the structure of the circuit board body 2 shown in FIG. 5 is the non-locking portion, and the structures other than the locking portion of the circuit board body 2 are not shown in FIG. 5 . Among the structures other than the snap-in portion of the circuit board body 2 , at least a part is provided outside the back plate member 1 .

Taking FIG. 5 as an example, the through grooves can be formed after the material in the preset area is formed in the base plate 11. For example, the through grooves can be formed in the base plate 11 by processing methods such as cutting or punching. It is the side surface of the fixed groove 4 (through groove).

In FIG. 5 , the circuit board body is arranged above the reinforcement part 3 and embedded in the fixing groove 4 , the reinforcement part 3 is located outside the back plate member 1 , and the reinforcement part 3 extends beyond the circuit board on the left and right sides of the circuit board body 2 . Board body 2. The parts of the reinforcement part 3 on the left and right sides of the circuit board body 2 are attached and connected to the parts of the bottom plate 11 except for the through grooves.

Optionally, as shown in FIG. 5 , the backlight module provided in this embodiment of the present application further includes a first adhesive tape 5 . The portion of the reinforcement portion 3 extending beyond the circuit board body 2 along the first direction is attached and connected to the outer surface of the bottom plate 11 except for the through groove through the first adhesive tape 5 .

Taking FIG. 5 as an example, the first tape 5 includes two parts. One part of the first tape 5 corresponds to the part of the reinforcement part 3 on the left side of the circuit board body 2 , and the other part of the first tape 5 and the reinforcement part 3 are on the circuit board body. 2 The part on the right side corresponds. The first adhesive tape 5 is respectively attached to the second board 112 and the circuit board body 2 , so that the circuit board body 2 and the second board 112 are connected.

Optionally, as shown in FIG. 1 and FIG. 5 , the backlight module provided in the embodiment of the present application further includes a light-emitting body 6 . The light-emitting body 6 is disposed on the side of the circuit board assembly away from the reinforcement portion 3 and is electrically connected to the circuit board body 2 . The light-emitting body 6 is located inside the back plate member 1 , and the light-emitting body 6 includes an LED (Light Emitting Diode, light-emitting diode).

Optionally, as shown in FIG. 1 and FIG. 5 , the backlight module provided in the embodiment of the present application further includes a light guide assembly 7 and a light shielding belt 8 . The light guide assembly 7 includes a reflective sheet 71 , a light guide plate 72 and an optical film layer group 73 stacked in sequence. The light guide assembly 7 is disposed on one side of the light-emitting body 6 along the first direction of the base plate 11 . A part of the light shielding tape 8 is attached and connected to the top plate 13 of the back plate member 1 , and the other part covers a part of the optical film layer group 73 .

Taking FIG. 1 and FIG. 5 as an example, the light guide assembly 7 is arranged on the right side of the light-emitting body 6 . The reflection sheet 71 is on the inner surface of the base plate 11 by the reflection sheet tape 75, the light guide plate 72 is arranged above the reflection sheet 71, and one end of the light guide plate 72 in the first direction is facing the illuminant 6, and the optical film layer group 73 includes The diffusion sheet 731 , the lower polarizer 732 and the upper polarizer 733 are sequentially stacked from bottom to top. The diffusion sheet 731 is disposed above the light guide plate 72 . On the part of the diffusion sheet 731 extending beyond the lower polarizer 732 in the first direction, a diffusion rubber strip 74 is provided. The portion of the shading tape 8 close to the left edge is attached and connected to the top plate 13 , and the remaining portion extends to the right, covering a portion of the diffusion rubber strip 74 and a portion of the upper polarizer 733 in turn.

Optionally, as shown in FIG. 1 and FIG. 5 , the backlight module provided by the embodiment of the present application further includes a Mylay film (Mylay) 9 , and a part of the Mylay film 9 is attached to the side plate 12 of the back plate member 1 . On the outer surface, another part of the Mylar film 9 is attached to the outer surface of the light-shielding tape 8 , and a spacer 10 is also provided above the portion of the Mylar film 9 that is attached to the light-shielding tape 8 . The Mylar film 9 can increase the bonding strength and prevent the light-shielding tape 8 from being separated from the back plate member 1 .

Optionally, in the application embodiment, the circuit board body 2 may be FPC (Flexible Printed Circuit, flexible circuit board), and the material of the reinforcing portion 3 may be PI (polyimide polyimide).

For the backlight module shown in FIG. 5 of the embodiment of the present application, since the fixing groove 4 of the bottom plate 11 in the back plate member is a through groove passing through the bottom plate 11 , the backlight module can be assembled by a simpler method. Before the overall assembly of the backlight module, the reinforcing part 3 and the light-emitting body 6 should be attached to the two sides of the circuit board body 2 respectively to form a light-emitting assembly, in which a part of the reinforcing part 3 extends beyond the circuit board. Body 2, and then perform the following assembly steps:

(1) For the light-emitting assembly composed of the circuit board body 2 , the reinforcement part 3 and the light-emitting body 6 , the first tape 5 is attached to the part of the reinforcement part 3 beyond the circuit board body 2 .

(2) The light-emitting body 6 and the circuit board body 2 installed together are inserted from the outside of the back plate member 1 to the inside through the fixing groove 4 as a through groove, so that the light-emitting body 6 is placed in the back plate member 1 . inside, and the circuit board body 2 is located in the fixing slot 4 . After that, the first adhesive tape 5 on the reinforcing part 3 is attached to the part of the bottom plate 11 except for the through grooves.

(3) The reflective sheet 71 , the light guide plate 72 , the optical film layer group 73 , the light shielding tape 8 , the Mylar film 9 and the spacer 10 are sequentially mounted on the back plate member 1 . Optionally, the process of installing the reflective sheet 71 includes installing the reflective sheet tape 75 on the inner surface of the backplane member 1 away from the circuit board body 2, and then installing the reflective sheet 71 on the side of the reflective sheet tape 75 away from the backplane member 1 and On the inner surface of the back plate member 1 other than the circuit board body 2 and the reflection sheet tape 75 occupied.

Compared with the prior art in which the luminous body 1 and the circuit board assembly are installed through the front of the back plate member 1, the above assembling method is to install the luminous body 1 and the circuit board assembly on the back of the back plate member 1, which is more convenient for the installation operation and can have Significantly improve assembly efficiency.

Based on the same inventive concept, the embodiments of the present application also provide a display device, including the backlight module provided by the embodiments of the present application.

By applying the embodiments of the present application, at least the following beneficial effects can be achieved:

In the backlight module provided by the embodiment of the present application, when a part of the circuit board body is arranged in the fixing groove, the reinforcing part is attached and connected to the part outside the fixing groove in the base plate; when the reinforcing part is arranged in the fixing groove, A part of the circuit board body is attached and connected with the part outside the fixing groove in the bottom plate.

Taking the reinforcement part arranged in the fixing slot as an example, the side of the fixing slot can limit the movement of the reinforcement part in the direction parallel to the bottom plate. The movement of the body in the direction parallel to the base plate; in addition, the circuit board body is also attached to the base plate, which limits the movement of the circuit board body in the direction perpendicular to the base plate. It can be seen that, in the backlight module provided by the embodiments of the present application, the movement of the circuit board body in any direction in space is restricted, which improves the stability of the connection between the circuit board body and the backplane member, so that the circuit board body can be It can withstand a large impact force, reducing the risk of uneven brightness and light leakage of the backlight module.

Those skilled in the art can understand that various operations, methods, steps, measures, and solutions in the process discussed in this application may be alternated, modified, combined or deleted. Further, other steps, measures, and solutions in the various operations, methods, and processes that have been discussed in this application may also be alternated, modified, rearranged, decomposed, combined, or deleted. Further, steps, measures and solutions in the prior art with various operations, methods, and processes disclosed in this application may also be alternated, modified, rearranged, decomposed, combined or deleted.

In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

The terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the description of this specification, the particular features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

It should be understood that although the various steps in the flowchart of the accompanying drawings are sequentially shown in the order indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless explicitly stated herein, the steps are performed in no strict order and may be performed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, and the execution sequence is also It does not have to be performed sequentially, but may be performed alternately or alternately with other steps or at least a portion of sub-steps or stages of other steps.

The above are only part of the embodiments of the present application. It should be pointed out that for those skilled in the art, without departing from the principles of the present application, several improvements and modifications can also be made. It should be regarded as the protection scope of this application.

Claims (10)

1. A backlight module, characterized in that it comprises a backplane member (1) and a circuit board assembly; the circuit board assembly comprises a circuit board body (2), and is connected to one side of the circuit board body (2) the reinforcement (3); The bottom plate (11) of the back plate member (1) is provided with a fixing groove (4), and the fixing groove (4) is formed by bending the bottom plate (11) or the fixing groove (4) is a through-hole. the through groove of the bottom plate (11); A part of the circuit board body (2) or the reinforcing part (3) is arranged in the fixing groove (4), and the other part is located in the base plate (11) outside the fixing groove (4) fit connection; The shape of the fixing groove (4) matches the shape of the reinforcing part (3), and the reinforcing part (3) is embedded in the fixing groove (4); The shape of the snap-in portion of the circuit board body (2) is matched, and the side surface of the snap-in portion of the circuit board body (2) is in contact with the side surface of the through groove, and the circuit board body (2) The snap-in portion is located in the through groove. 2. The backlight module according to claim 1, characterized in that, along the first direction of the bottom plate (11), the size of the circuit board body (2) is larger than the size of the reinforcing portion (3); The part of the circuit board body (2) beyond the reinforcement part (3) is attached and connected to the part of the bottom plate (11) except for the fixing groove (4). 3 . The backlight module according to claim 2 , wherein the bent bottom plate ( 11 ) comprises a first plate part ( 111 ) and a second plate part ( 112 ); the first plate part (111) and the second plate member (112) are adjacent and connected along the first direction; The inner surface of the first plate (111) is lower than the inner surface of the second plate (112), and the inner surface of the first plate (111) is the bottom surface of the fixing groove (4) , the transition structure (113) between the first plate (111) and the second plate (112) is one side of the fixing slot (4); the circuit board body (2) extends beyond the The part of the reinforcing part (3) is attached and connected with the inner surface of the second plate (112). 4 . The backlight module according to claim 3 , further comprising a first adhesive tape ( 5 ); the portion of the circuit board body ( 2 ) extending beyond the reinforcing portion ( 3 ) along the first direction. 5 . , the first adhesive tape (5) is attached and connected with the inner surface of the second board member (112). 5 . The backlight module according to claim 4 , wherein the bottom surface of the reinforcing portion ( 3 ) is attached to the inner surface of the first plate member ( 111 ), and the first adhesive tape ( 5 ) The bottom surface of the tape is attached to the inner surface of the second board (112); the top surface of the reinforcing part (3) is flush with the top surface of the first tape (5), and both are flush with the circuit board The body (2) is fitted. 6. The backlight module according to claim 1, characterized in that, along the first direction of the bottom plate (11), the size of the circuit board body (2) is smaller than the size of the reinforcing portion (3); The reinforcing portion (3) is located on the outer side of the back plate member (1), and the portion of the reinforcing portion (3) that extends beyond the circuit board body (2) has a gap with the bottom plate (11). The parts other than the through grooves are attached and connected. 7 . The backlight module according to claim 6 , further comprising a first adhesive tape ( 5 ); the portion of the reinforcing portion ( 3 ) extending beyond the circuit board body ( 2 ) along the first direction. 8 . , the first adhesive tape (5) is attached and connected to the outer surface of the bottom plate (11) except for the through groove. 8 . The backlight module according to claim 1 , further comprising a light-emitting body ( 6 ); the light-emitting body ( 6 ) is disposed on a side of the circuit board assembly away from the reinforcing portion ( 3 ). 9 . side, and is electrically connected to the circuit board body (2). 9 . The backlight module according to claim 8 , further comprising a light guide assembly (7) and a light shielding tape (8); the light guide assembly (7) comprises a reflective sheet (71), a light guide plate that are stacked in sequence. 10 . (72) and the optical film layer set (73); The light guide assembly (7) is arranged on one side of the light-emitting body (6) along the first direction of the bottom plate (11); a part of the light shielding tape (8) and the back plate member (1) The top plate (13) is attached and connected, and the other part covers a part of the optical film layer group (73). 10. A display device, comprising the backlight module according to any one of claims 1-9.

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