CN218601643U - Backlight module and display device - Google Patents

Abstract

The application discloses a backlight module and a display device, which comprise a back plate, a light bar and a heat dissipation piece, wherein the back plate comprises a bottom wall and a side wall; the heat dissipation piece comprises a first heat dissipation piece, and a part of the first heat dissipation piece is arranged on the inner surface of the side wall of the back plate; the side wall is provided with a plurality of slots, and bulges are formed among the slots; another portion of the first fin is exposed through the slot. Expose part first fin through the fluting on the lateral wall, can transmit first fin with the heat that the lamp strip during operation produced to in giving off the outside air through first fin, thereby reduce backlight unit's temperature, improve backlight unit's life and security.

Description

Backlight module and display device

Technical Field

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

Background

In the related art, an LCD (liquid crystal display) product is an inactive light-emitting electronic device, which does not have a light-emitting characteristic, and must rely on a light source in a backlight module to obtain a display performance. However, heat generated by the light source in the backlight module after long-time operation cannot be dissipated, so that the service life of the backlight module is greatly reduced, and potential safety hazards are caused.

The heat dissipation structure of the backlight module provided in the prior art is arranged on the inner side of the back plate, so that the heat dissipation structure cannot directly dissipate heat into the air, the heat dissipation effect is limited, and the problems cannot be completely solved.

Disclosure of Invention

In view of this, the present application provides a backlight module and a display device to solve the problem that the life of the backlight module is reduced due to the fact that heat generated by a light source in the backlight module cannot be dissipated in the prior art.

In order to solve the above technical problem, a first technical solution provided by the present application is: the backlight module comprises a back plate, a light bar and a heat dissipation piece, wherein the back plate comprises a bottom wall and a side wall, the heat dissipation piece is arranged on the inner side of the side wall, and the light bar is arranged on one side, far away from the side wall, of the heat dissipation piece; the heat dissipation piece comprises a first heat dissipation piece, and a part of the first heat dissipation piece is arranged on the inner surface of the side wall of the back plate; the side wall is provided with a plurality of slots, and a bulge is formed between the slots; another portion of the first heat sink is exposed through the slot.

Optionally, the heat dissipation member further includes a second heat dissipation fin, the second heat dissipation fin is connected to the first heat dissipation fin, and is bent relative to the first heat dissipation fin and at least partially disposed outside the bottom wall of the back plate.

Optionally, the second heat sink has a plurality of first through holes at the connection between the first heat sink and the second heat sink; the plurality of first through holes are distributed along the bending lines of the first radiating fin and the second radiating fin; the bottom wall penetrates through the first through hole and is connected with the protrusion, or the protrusion penetrates through the first through hole and is connected with the bottom wall.

Optionally, the first heat sink has a plurality of first grooves near the edge of the second heat sink, and the second heat sink has a plurality of second grooves near the edge of the first heat sink; one of the first grooves cooperates with one of the second grooves to form the first through hole.

Optionally, the second heat sink includes a body portion and a plurality of heat sink fins, the body portion is connected to the first heat sink fin, and a plurality of the second grooves are formed near an edge of the first heat sink fin; a plurality of radiating blades are connected with the edge of the body part far away from the first radiating fin; the plurality of radiating fins are arranged along the edge of the body part far away from the first radiating fin at intervals.

Optionally, the heat dissipation blades are bent for multiple times to form a plurality of heat dissipation grooves arranged at intervals; wherein the opening of the heat dissipation groove is towards the bottom wall of the back plate or away from the bottom wall of the back plate.

Optionally, the heat dissipating fin includes a plurality of first extending portions and second extending portions alternately arranged; the first extending portions are parallel to the bottom wall of the back plate, the second extending portions are perpendicular to the bottom wall of the back plate, and the adjacent two second extending portions and the first extending portion connected with the adjacent two second extending portions are arranged in an encircling mode to form the heat dissipation groove.

Optionally, at least part of the end of the radiating blade far away from the first radiating fin is provided with a second through hole; and fixing the end part of the radiating blade with the second through hole to the bottom wall of the back plate through a fixing piece.

Optionally, a boss corresponding to the second through hole is arranged on the outer surface of the bottom wall of the back plate, and the end part of the heat dissipation blade, which is provided with the second through hole, is fixed to the boss, so that the heat dissipation blade and the outer surface of the bottom wall of the back plate are arranged at an interval; the side wall of the first groove extends to one side of the bottom wall far away from the side wall, and the body part is connected with the end part of the side wall of the first groove extending to one side of the bottom wall far away from the side wall, so that the whole second cooling fin is arranged at intervals with the outer surface of the bottom wall of the back plate.

In order to solve the above technical problem, a second technical solution provided by the present application is: the display device comprises a display panel and a backlight module, wherein the backlight module is any one of the backlight modules, and the display panel and the backlight module are arranged oppositely.

The beneficial effect of this application: different from the prior art, the backlight module comprises a back plate, a light bar and a heat dissipation part, wherein the back plate comprises a bottom wall and a side wall, the heat dissipation part is arranged on the inner side of the side wall, and the light bar is arranged on one side of the heat dissipation part far away from the side wall; the heat dissipation piece comprises a first heat dissipation piece, and a part of the first heat dissipation piece is arranged on the inner surface of the side wall of the back plate; the side wall is provided with a plurality of slots, and bulges are formed among the slots; another portion of the first fin is exposed through the slot. Expose part of first fin through the fluting on the lateral wall, can transmit first fin with the heat that the lamp strip during operation produced to in giving off the outside air through first fin, thereby reduce backlight unit's temperature, improve backlight unit's life and security.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic perspective view of a backlight module according to an embodiment of the present disclosure;

fig. 2 is a schematic perspective view of another backlight module according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a back plate according to an embodiment of the present application;

fig. 4 is a schematic structural view of a heat sink provided in an embodiment of the present application;

fig. 5 is an enlarged schematic view of a portion a of the heat sink provided in fig. 4;

fig. 6 is a schematic cross-sectional view illustrating a partial structure of a backlight module according to an embodiment of the present application;

fig. 7 is a schematic cross-sectional view of a portion of a backlight module according to another embodiment of the present application;

fig. 8 is a block diagram schematically illustrating a structure of a display device according to an embodiment of the present disclosure.

Description of reference numerals:

10-back plate, 101-boss, 1011-third through hole, 11-bottom wall, 12-side wall, 121-notch, 122-protrusion, 20-light bar, 30-heat sink, 31-first heat sink, 32-second heat sink, 321-body part, 322-heat sink blade, 3220-heat sink, 3221-first extension part, 3222-second extension part, 3223-second through hole, 33-first through hole, 331-first groove, 332-second groove, 333-side wall of first groove, 34-bending line, 50-fixing part and 100-backlight module.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The terms "first", "second", and the like in this application are used for descriptive purposes only and are not to 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 explicitly or implicitly include at least one such feature. In the embodiments of the present application, all directional indicators (such as upper, lower, left, right, front, rear, 8230; \8230;) are used only to explain the relative positional relationship between the components at a specific posture (as shown in the drawing), the motion, etc., and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

Referring to fig. 1 to 3, fig. 1 is a schematic perspective view of a backlight module according to an embodiment of the present disclosure; fig. 2 is a schematic perspective view of another backlight module according to an embodiment of the present disclosure; fig. 3 is a schematic structural diagram of a back plate according to an embodiment of the present application.

The backlight module 100 provided by the present application may include a back panel 10, a light bar 20 and a heat dissipation member 30, wherein the back panel 10 includes a bottom wall 11 and a side wall 12, the heat dissipation member 30 is disposed inside the side wall 12, and the light bar 20 is disposed on one side of the heat dissipation member 30 away from the side wall 12. The backlight module 100 may further include a reflective sheet (not shown), an optical film (not shown), a light guide plate (not shown), and the like, which are disposed inside the back plate 10, wherein the reflective sheet, the light guide plate, and the optical film may be stacked on the bottom wall 11 of the back plate 10, and the light outlet of the light bar 20 is disposed opposite to the light guide plate.

Specifically, the bottom wall 11 of the back plate 10 is provided with a side wall 12, and the side wall 12 can be formed by connecting two sets of symmetrically arranged strip materials end to end, or formed by bending the strip materials into a whole. The back plate 10 may be made of metal or composite material, such as aluminum or aluminum plastic material. In this embodiment, the bottom wall 11 and the side wall 12 are integrally formed to form the back plate 10, so that the overall strength is higher.

In one embodiment, as shown in FIG. 3, one of the sidewalls 12 of the back-plate 10 has a plurality of slots 121, and a protrusion 122 is formed between two adjacent slots 121, such that the sidewall 12 having the plurality of slots 121 also has a plurality of protrusions 122 disposed at intervals. The set width of the protrusion 122 may be wider or narrower than the width of the slot 121, or substantially the same as the width of the slot 121, and is set according to the requirement, which is not limited in this application.

Referring to fig. 4 to 7, fig. 4 is a schematic structural diagram of a heat dissipation element according to an embodiment of the present disclosure; fig. 5 is an enlarged schematic view of a portion a of the heat sink provided in fig. 4; fig. 6 is a schematic cross-sectional view illustrating a partial structure of a backlight module according to an embodiment of the present application; fig. 7 is a schematic cross-sectional view of a part of a backlight module according to another embodiment of the present disclosure.

In an embodiment, the heat dissipation member 30 includes a first heat dissipation fin 31 and a second heat dissipation fin 32, and the first heat dissipation fin 31 and the second heat dissipation fin 32 may be an integrally formed metal member, such as an aluminum sheet or a copper sheet. The connection can also be realized by welding, clamping and the like.

A fixing adhesive layer (not shown), such as a double-sided adhesive, may be disposed between the light bar 20 and the first heat sink 31, and between the first heat sink 31 and the sidewall 12. In other embodiments, the heat sink 30 may be fastened to the sidewall 12 by its own structure, which is not limited in this application.

The second heat sink fins 32 are bent relative to the first heat sink fins 31 and at least partially disposed outside the bottom wall 11 of the back plate 10, so that heat can be dissipated to the outside of the back plate 10 through the second heat sink fins 32. One part of the first heat sink 31 is disposed on the inner surface of the sidewall 12 (i.e. the inner surface of the protrusion 122) having the slot 121 of the back plate 10, and the other part is exposed through the slot 121, so that the heat generated by the light bar 20 is dissipated to the outside of the back plate 10 through the first heat sink 31 directly through the first heat sink 31, thereby reducing the overall temperature of the backlight module 100.

Specifically, in an embodiment, as shown in fig. 4 to 6, a plurality of first through holes 33 are formed at the connection position of the first heat sink 31 and the second heat sink 32; the plurality of first through holes 33 are distributed along the bending lines 34 of the first heat sink 31 and the second heat sink 32. The bottom wall 11 of the back plate 10 is connected to the protrusion 122 through the first through hole 33, or the protrusion 122 is connected to the bottom wall 11 through the first through hole 33, so that a part of the first heat sink 31 can be held inside the side wall 12, and another part is partially exposed to the outside through the slot 121 and contacts with the air, which is convenient for dissipating the heat generated by the light bar 20. In addition, the bottom wall 11 of the back plate 10 penetrates through the first through hole 33 to be connected with the protrusion 122, so that the whole second heat sink 32 is arranged outside the bottom wall 11 of the back plate 10, and the heat of the bottom wall 11 of the back plate 10 can be further dissipated. The first heat sink 31 is arranged at an angle, for example 60-120, preferably 90, to the second heat sink 32. So that the bottom wall 11 is more easily connected to the protrusion 122 through the first through hole 33, or the protrusion 122 is more easily connected to the bottom wall 11 through the first through hole 33.

As shown in fig. 5 and 6, the first heat sink 31 has a plurality of first recesses 331 near the edge of the second heat sink 32, and the second heat sink 32 has a plurality of second recesses 332 near the edge of the first heat sink 31; a first recess 331 cooperates with a second recess 332 to form the first through hole 33.

Specifically, in one embodiment, the first grooves 331 are located on the first heat sink 31 on one side of the bending line 34, the second grooves 332 are located on the second heat sink 32 on the other side of the bending line 34, and the notch of one first groove 331 and the notch of one second groove 332 are oppositely arranged to form one first through hole 33 through which the protrusion 122 can pass. That is, the bending line 34 crosses the first through hole 33, or the first through hole 33 is bent at the bending line 34. The plurality of first grooves 331 and the plurality of second grooves 332 may cooperate to form a plurality of first through holes 33, and the plurality of first through holes 33 are uniformly distributed along the length direction of the first fin 31 (i.e., the direction of the bending line 34). Furthermore, each of the first through holes 33 has a corner formed by the first recess 331 and the second recess 332 so that the protrusion 122 penetrates the corner. It can be understood that, during the installation, the first concave 331 is sleeved on the protrusion 122, and then the heat sink 30 is rotated along the bending line 34, and the second heat sink 32 is rotated to the outer surface of the bottom wall 11; since the second heat sink 32 has the second groove 332, the heat sink 30 is not interfered by the bottom wall 11 during the rotation process, and the second heat sink 32 is connected to the bottom wall 11.

As shown in fig. 3 and 7, in another embodiment, the first through hole 33 may also be completely located on the second heat sink 32, and after the protrusion 122 penetrates through the first through hole 33, the second heat sink 32 is bent, so that the second heat sink 32 is located outside the bottom wall 11 of the back plate 10.

As shown in fig. 5 and 6, in an embodiment, the second heat sink 32 includes a body portion 321 and a plurality of heat sink fins 322, the body portion 321 is connected to the first heat sink 31, and a plurality of second grooves 332 are formed near an edge of the first heat sink 31. That is, the second groove 332 is opened on the body 321 of the second heat sink 32 and connected to the first groove 331.

As shown in fig. 5, a plurality of heat dissipating fins 322 are connected to the edge of the main body 321 away from the first heat dissipating fin 31 and are spaced along the edge of the main body 321 away from the first heat dissipating fin 31. That is, the plurality of radiating fins 322 are connected to the body 321 to form the integral second radiating fin 32. The plurality of heat dissipating fins 322 are uniformly and equally spaced along the edge of the body 321 away from the first heat dissipating fin 31, so that the heat of the back plate 10 can be dissipated from the gap between two adjacent heat dissipating fins 322, thereby improving the heat dissipating effect. The heat dissipation fins 322 extend parallel to the bottom wall 11 of the back plate 10 and perpendicular to the body 321 (i.e., perpendicular to the bending line 34).

As shown in fig. 6, the heat dissipating fins 322 are bent for multiple times to form a plurality of heat dissipating slots 3220 arranged at intervals, so that heat of the heat dissipating fins 322 can be dissipated from the slots of the heat dissipating slots 3220, thereby achieving a better heat dissipating effect.

Specifically, the heat dissipating blade 322 may include a plurality of first extending portions 3221 and second extending portions 3222 alternately arranged. In an embodiment, the first extending portions 3221 are parallel to the bottom wall 11 of the back plate 10, the second extending portions 3222 are perpendicular to the bottom wall 11 of the back plate 10, and two adjacent second extending portions 3222 and the first extending portion 3221 connecting the two adjacent second extending portions 3222 enclose to form the heat dissipating groove 3220. It can be understood that, since the heat dissipating slot 3220 in this embodiment is composed of the first extending portion 3221 and the second extending portion 3222 which are perpendicular to each other, the opening of the heat dissipating slot 3220 is a rectangular slot facing the bottom wall 11 of the back plate 10 or facing away from the bottom wall 11 of the back plate 10, and a plurality of openings facing the bottom wall 11 and a plurality of rectangular slots facing away from the bottom wall 11 are alternately arranged to form the heat dissipating blades 322 in a shape of a great wall. The great wall shaped heat dissipation fins 322 can reduce the occupied space of the second heat dissipation fins 32, and the slots of the heat dissipation grooves 3220 are favorable for transverse air convection, thereby dissipating heat quickly. In other embodiments, the first extending portion 3221 and the second extending portion 3222 of the heat dissipating slot 3220 may have any angle, such as an acute angle, an obtuse angle, a rounded angle, etc., connected to each other, so that the shape of the heat dissipating slot 3220 may be a wave shape in the shape of a triangle, a circular arc, a chamfer, etc., wherein the angle of the wave shape may be arbitrarily set, which is not limited in this application.

As shown in fig. 5, at least a portion of the end of the heat dissipating blade 322 away from the first heat dissipating fin 31 has a second through hole 3223, and the end of the heat dissipating blade 322 having the second through hole 3223 is fixed to the bottom wall 11 of the back plate 10 by a fixing member 50, such as a screw, or by an adhesive. It is understood that, in order to improve the connection effect of the heat dissipating fin 322 with the bottom wall, the width of the portion of the heat dissipating fin 322 having the second through hole 3223 may be set to be larger than the width of the other heat dissipating fins 322 as a fixing piece. In this embodiment, a plurality of fixing plates are disposed corresponding to the first through holes 33, and a plurality of other heat dissipating fins 322 are disposed between two adjacent fixing plates.

As shown in fig. 6, in an embodiment, the outer surface of the bottom wall 11 of the back plate 10 has a boss 101 corresponding to the second through hole 3223, a third through hole 1011 is formed in the boss 101, and an end of a part of the heat dissipating blades 322 having the second through hole 3223 and an end of the third through hole 1011 away from the outer surface of the bottom wall 11 are fixed by a fixing member 50, so that the heat dissipating blades 322 are spaced apart from the outer surface of the bottom wall 11 of the back plate 10, thereby achieving a better heat dissipating effect.

Further, the side wall 333 of the first recess 331 extends to a side of the bottom wall 11 away from the side wall 12, and the main body 321 is connected to an end of the side wall 333 of the first recess 331 extending to a side of the bottom wall 11 of the back plate 10 away from the side wall 12 of the back plate 10, so that the whole second heat sink 32 is spaced from the outer surface of the bottom wall 11 of the back plate 10.

Specifically, the side wall 333 of the first recess 331 extends to a side of the bottom wall 11 away from the side wall 12 and is connected to the main body 321, so that a side of the second heat sink 32 close to the first recess 331 can be suspended, and an end of the heat sink 322 away from the main body 321 is connected to the boss 101, so that a certain distance can be left between the second heat sink 32 and the bottom wall 11. So that the whole second heat sink 32 is spaced from the outer surface of the bottom wall 11 of the back plate 10, thereby providing a better heat dissipation effect to the back plate 10.

The backlight module 100 disclosed by the application comprises a back plate 10, a light bar 20 and a heat dissipation member 30, wherein the back plate 10 comprises a bottom wall 11 and a side wall 12, the heat dissipation member 30 is arranged on the inner side of the side wall 12, and the light bar 20 is arranged on one side of the heat dissipation member 30 far away from the side wall 12; the heat sink 30 includes a first heat sink 31, a portion of the first heat sink 31 is disposed on the inner surface of the sidewall 12 of the back plate 10; the side wall 12 has a plurality of slots 121, and a protrusion 122 is formed between the plurality of slots 121; another portion of the first heat sink 31 is exposed through the slot 121. Part of the first heat dissipation fins 31 are exposed through the slots 121 on the side walls 12, so that heat generated during the operation of the light bar 20 can be transmitted to the first heat dissipation fins 31 and dissipated to the outside air through the first heat dissipation fins 31, thereby reducing the temperature of the backlight module 100 and improving the service life and safety of the backlight module 100. The heat dissipation problem of the module is effectively solved by the heat conduction of the heat dissipation member 30 of the copper sheet or the aluminum sheet, so that the overall temperature of the backlight module 100 is maintained in a safer temperature range, the service life of the backlight module 100 is prolonged, and the safety of the product is improved. The quality of the product is improved as a whole.

Referring to fig. 8, fig. 8 is a schematic block diagram of a structure of a display device according to an embodiment of the present disclosure.

The present application further provides a display device 200 using the backlight module 100, wherein the display device 200 further includes a display panel 201 and a control circuit board (not shown), and the control circuit board is used for performing display and light emission control on the display device 200. The display panel 201 and the backlight module 100 are disposed opposite to each other, and the backlight module 100 generates a relatively uniform backlight as a light source of the display panel 201 under the action of the backlight signal.

The display panel 201 may include a substrate (not shown), a driving circuit layer (not shown), a liquid crystal layer (not shown), and the like, which is not limited in this application.

The above description is only an embodiment of the present application, and is not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (10)

1. A backlight module comprises a back plate, a light bar and a heat dissipation piece, wherein the back plate comprises a bottom wall and a side wall, the heat dissipation piece is arranged on the inner side of the side wall, and the light bar is arranged on one side of the heat dissipation piece away from the side wall; it is characterized in that the preparation method is characterized in that,

the heat dissipation piece comprises a first heat dissipation piece, and a part of the first heat dissipation piece is arranged on the inner surface of the side wall of the back plate;

the side wall is provided with a plurality of slots, and a bulge is formed between the slots; another portion of the first heat sink is exposed through the slot.

2. The backlight module according to claim 1, wherein the heat sink further comprises:

the second radiating fin is connected with the first radiating fin, is bent relative to the first radiating fin and is at least partially arranged on the outer side of the bottom wall of the back plate.

3. The backlight module as claimed in claim 2, wherein the first heat sink and the second heat sink have a plurality of first through holes at their junctions; the plurality of first through holes are distributed along the bending lines of the first radiating fin and the second radiating fin; the bottom wall penetrates through the first through hole and is connected with the protrusion, or the protrusion penetrates through the first through hole and is connected with the bottom wall.

4. The backlight module according to claim 3, wherein the first heat sink has a plurality of first grooves near an edge of the second heat sink, and the second heat sink has a plurality of second grooves near an edge of the first heat sink; one of the first grooves cooperates with one of the second grooves to form the first through hole.

5. The backlight module according to claim 4, wherein the second heat sink comprises:

the body part is connected with the first radiating fin, and a plurality of second grooves are formed in the edge, close to the first radiating fin, of the body part;

a plurality of radiating blades connected with the edge of the body part far away from the first radiating fin; the plurality of radiating fins are arranged along the edge of the body part far away from the first radiating fin at intervals.

6. The backlight module as claimed in claim 5, wherein the heat dissipating fins are bent for multiple times to form multiple heat dissipating slots arranged at intervals; wherein the opening of the heat dissipation groove is towards the bottom wall of the back plate or away from the bottom wall of the back plate.

7. The backlight module according to claim 6, wherein the heat dissipating fins comprise a plurality of first extending portions and second extending portions alternately arranged; the first extending portions are parallel to the bottom wall of the back plate, the second extending portions are perpendicular to the bottom wall of the back plate, and the adjacent two second extending portions and the first extending portion connected with the adjacent two second extending portions are arranged in an encircling mode to form the heat dissipation groove.

8. The backlight module according to claim 5, wherein at least some of the fins have second through holes at the ends thereof away from the first fins; and fixing the end part of the heat dissipation blade with the second through hole to the bottom wall of the back plate through a fixing piece.

9. The backlight module according to claim 8, wherein the outer surface of the bottom wall of the back plate has a boss corresponding to the second through hole, and the end of the heat dissipating blade having the second through hole is fixed to the boss, so that the heat dissipating blade is spaced from the outer surface of the bottom wall of the back plate; the side wall of the first groove extends to one side of the bottom wall far away from the side wall, and the body part is connected with the end part of the side wall of the first groove extending to one side of the bottom wall far away from the side wall, so that the whole second cooling fin is arranged at intervals with the outer surface of the bottom wall of the back plate.

10. A display device, comprising:

a display panel;

a backlight module as claimed in any one of claims 1 to 9, wherein the display panel and the backlight module are arranged opposite to each other.

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