CN216697684U

CN216697684U - Backlight module and display device

Info

Publication number: CN216697684U
Application number: CN202123363863.XU
Authority: CN
Inventors: 季国飞; 袁海江
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-06-07
Anticipated expiration: 2031-12-29

Abstract

The application discloses backlight unit and display device, this backlight unit include optical assembly, backplate and backlight, the backplate includes bottom plate and first curb plate, the bottom plate is towards display panel's play plain noodles direction back of buckling, extends and forms first curb plate, first curb plate perpendicular to the bottom plate, the bottom plate with first curb plate parcel optical assembly is provided with a plurality of trompils on the first curb plate, the backlight includes the lamp plate, be provided with a plurality of lamp pearls on the lamp plate, the lamp plate sets up first curb plate is kept away from one side fixed connection of optical assembly, the lamp pearl is at least partly set up in the trompil. The application provides a backlight unit radiating effect is good, can improve display effect.

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

With the development of display technologies, better display effects are sought, and the display effects are closely related to the brightness of the backlight module. In order to pursue better display brightness, LED count is increasing, and it is often necessary to fully load or even overload, generating a great amount of heat.

In the prior art, the backlight source is arranged on the bottom plate, the bottom plate and the side plates wrap the optical assembly and the backlight source, so that generated huge heat cannot be effectively dissipated, the heat is accumulated in the back plate, the light guide plate and the optical membrane are heated and deformed, and the image display is abnormal.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a backlight module and a display device, which have good heat dissipation performance and improve the display effect.

The application discloses backlight unit includes: the backlight module comprises an optical assembly, a back plate and a backlight source, wherein the back plate comprises a bottom plate and a first side plate, the first side plate is perpendicular to the bottom plate, the optical assembly is wrapped by the bottom plate and the first side plate, and a plurality of holes are formed in the first side plate; the backlight includes the lamp plate, be provided with a plurality of lamp pearls on the lamp plate, the lamp plate sets up first curb plate is kept away from one side of optical component, the lamp pearl is at least partly to be set up in the opening.

Optionally, the number of the openings is the same as that of the lamp beads, the openings are arranged in one-to-one correspondence with the lamp beads, and the intervals of the openings are equal.

Optionally, the number of the openings is m, n lamp beads are arranged in each opening, m × n lamp beads are arranged on the lamp beads, and m and n are natural numbers larger than 0.

Optionally, the radial width orientation of trompil the direction of lamp plate dwindles gradually, the minimum radial width of trompil is greater than the radial width of lamp pearl.

Optionally, the backboard further comprises a second side plate, one end of the second side plate is connected with the end, far away from the bottom plate, of the first side plate, the other end of the second side plate extends in the direction far away from the optical assembly, the second side plate is parallel to the bottom plate, the first side plate is perpendicular to the second side plate, the lamp plate and the first side plate are far away from one side of the optical assembly in a butt joint mode, and the lamp plate and the second side plate are close to one side of the lamp plate in a butt joint mode.

Optionally, the lamp plate is a flexible lamp plate, the flexible lamp plate and a double faced adhesive tape are arranged between the first side plates, and the double faced adhesive tape fixes the flexible lamp plate on the first side plates.

Optionally, a reflective layer is disposed on an inner wall of the opening, and the reflective layer is used for reflecting light.

Optionally, the trompil is square trompil, the inner wall of square trompil has first face, second face, third face and fourth face, is close to the one side of bottom plate is the first face, first face with the third face is relative two sides, the second face with the fourth face is relative two sides, in the orientation optical assembly's direction, first face with interval between the third face reduces gradually, the second face with the interval crescent of fourth face.

Optionally, the both sides of lamp plate are equipped with buckle structure, correspond on the first curb plate buckle structure's position is equipped with the draw-in groove, buckle structure with the draw-in groove is mutually supported fixedly the lamp plate.

The application also discloses a display device, including display panel and foretell backlight unit, backlight unit does display panel provides the light source.

This application is through setting up the trompil on first curb plate, with the lamp plate setting on first curb plate, lamp pearl at least part sets up in the trompil for the lamp plate setting is no longer wrapped up by bottom plate and first curb plate in first curb plate outside, therefore the huge heat that the lamp plate produced can follow the outside effluvium of first curb plate, can avoid the high temperature can lead to backlight life to reduce, the abnormal scheduling problem of picture display.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is a schematic cross-sectional view of a first backlight module according to a first embodiment of the present application;

FIG. 2 is a top schematic view of a first side panel according to a first embodiment of the present application;

FIG. 3 is a top schematic view of another first side panel of the first embodiment of the present application;

FIG. 4 is a schematic cross-sectional view illustrating a second backlight module according to a first embodiment of the present disclosure;

fig. 5 is a top schematic view of a first side panel of a second embodiment of the present application;

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

fig. 7 is a top schematic view of a first side panel of a second embodiment of the present application;

fig. 8 is a schematic cross-sectional view of a backlight according to a second embodiment of the present application;

fig. 9 is a schematic cross-sectional view of a display device according to a third embodiment of the present application.

100, a backlight module; 200. a back plate; 210. a base plate; 220. a first side plate; 221. opening a hole; 221a, a first hole; 221b, a second hole; 2211. a first side; 2212. a second face; 2213. a third surface; 2214. a fourth surface; 222. a second side plate; 223. a reflective layer; 230. double-sided adhesive tape; 300. a backlight source; 310. a lamp panel; 311. a buckle structure; 320. a lamp bead; 400. an optical component; 410. a reflective sheet; 420. a light guide plate; 430. a protective layer; 500. a display panel.

Detailed Description

It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.

Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

In order to solve the problem of poor heat dissipation effect of the conventional backlight module, the embodiment of the application provides a backlight module. The present application will be described in further detail with reference to the following drawings and examples. The following examples are merely illustrative of the present application and do not limit the scope of the present application. Meanwhile, the following embodiments are only some embodiments of the present application and not all embodiments of the present application, and all other solutions obtained by those skilled in the art without making creative efforts shall fall within the protection scope of the present application. It is to be noted that the embodiments described herein can be combined with other embodiments.

The first embodiment is as follows:

as shown in fig. 1, fig. 1 is a schematic cross-sectional view of a first backlight module 100 according to a first embodiment of the present disclosure, where the backlight module 100 includes an optical assembly 400, a back plate 200, and a backlight source 300, the back plate 200 includes a bottom plate 210 and a first side plate 220, the bottom plate 210 is bent toward a light exit surface of a display panel 500 and extends to form the first side plate 220, the first side plate 220 is perpendicular to the bottom plate 210, the bottom plate 210 and the first side plate 220 wrap the optical assembly 400, and a plurality of holes 221 are formed in the first side plate 220; backlight 300 includes lamp plate 310, be provided with a plurality of lamp pearls 320 on lamp plate 310, lamp plate 310 sets up first curb plate 220 is kept away from one side fixed connection of optical component 400, lamp pearl 320 at least part sets up in the trompil 221.

In this application, through set up trompil 221 on first curb plate 220, set up lamp plate 310 on first curb plate 220, lamp pearl 320 is at least partly set up in trompil 221 for lamp plate 310 sets up in first curb plate 220 is outside, no longer by bottom plate 210 and first curb plate 220 parcel, therefore the huge heat that lamp plate 310 produced can follow first curb plate 220 outside effluvium, can avoid the high temperature can lead to backlight 300 life to reduce, the abnormal scheduling problem of picture display. The heat generated by the lamp panel 310 is no longer collected inside the backplate 200, and the thermal deformation of the light guide plate 420 and the reflective sheet 410 in the optical assembly 400 can be avoided, so that the temperature of the display panel 500 is lower during normal display. And, this application sets up backlight 300 on first curb plate 220, and lamp pearl 320 is at least partly set up in trompil 221, has saved the inside a large amount of spaces of backplate 200, can accomplish narrower frame. It should be noted that, in this embodiment, the number of the openings 221 and how many beads 320 are disposed in each opening 221 are not limited herein, and the following embodiments are further described.

As shown in fig. 2, fig. 2 is a schematic top view of a first side plate 220 according to a first embodiment of the present disclosure, the number of openings 221 formed in the first side plate 220 is the same as the number of lamp beads 320 of a backlight 300, the lamp beads 320 and the openings 221 are arranged in a one-to-one correspondence, and the intervals between the openings 221 are equal. In this scheme, through setting up lamp pearl 320 and trompil 221 one-to-one for the light of each lamp pearl 320 all can be launched to optical assembly 400 through the opening that corresponds, and set up the distance between a plurality of trompils 221 to equal, make the light of each lamp pearl 320 all even shine in backlight unit 100, under the circumstances that does not influence lamp pearl 320 and normally work, can set up lamp plate 310 in the outside of first curb plate 220, improve backlight unit 100's heat dissipation function. And the opening 221 arranged in one-to-one correspondence also has the alignment function, so that the lamp beads 320 can be protected, and the installation is convenient.

As shown in fig. 3, a plurality of lamp beads 320 may also be disposed in the opening 221, for example, m lamp beads 320 are disposed in each opening 221, m × n lamp beads 320 are disposed in each opening 221, and it should be noted that m and n are both natural numbers greater than 0. Under the condition that need backlight unit 100 higher luminance, often need set up more quantity of lamp pearl 320 for the interval between its adjacent lamp pearl 320 is very limited, so that adjacent lamp pearl 320 can't set up trompil 221 respectively alone, therefore in this embodiment, set up a plurality of lamp pearls 320 in a trompil 221, this design can avoid trompil 221 quantity too much, leads to first curb plate 220 stability to reduce, receives cracked risk when external shock. It should be noted that the shape of the opening 221 may correspond to the shape of the lamp bead 320. The opening 221 is large in radial width and good in heat dissipation effect.

As shown in fig. 4, fig. 4 discloses a cross-sectional schematic view of a second backlight module 100 according to a first embodiment of the present disclosure, where the backlight module 100 includes an optical assembly 400, a back plate 200, and a backlight source 300, the back plate 200 includes a bottom plate 210 and a first side plate 220, the bottom plate 210 is bent toward a light exit surface of a display panel 500 and extends to form the first side plate 220, the first side plate 220 is perpendicular to the bottom plate 210, the bottom plate 210 and the first side plate 220 wrap the optical assembly 400, the first side plate 220 is uniformly provided with a plurality of holes 221, and intervals of the plurality of holes 221 are equal. Backlight 300 includes lamp plate 310 and lamp pearl 320, be provided with a plurality of lamp pearls 320 on the lamp plate 310, lamp plate 310 sets up first curb plate 220 is kept away from one side fixed connection of optical component 400 sets up lamp pearl 320 at least partially in trompil 221, the radial width orientation of trompil 221 the direction of lamp plate 310 reduces gradually, the minimum radial width of trompil 221 is greater than the radial width of lamp pearl 320.

Specifically, as shown in fig. 5, the opening 221 is a truncated cone-shaped opening 221, a first hole 221a is formed in a side of the opening 221 close to the lamp panel 310, a second hole 221b is formed in a side of the opening 221 far from the lamp panel 310, a radius of the first hole 221a is smaller than a radius of the second hole 221b, and a truncated cone side surface is formed between the first hole 221a and the second hole 221 b. The adjacent second holes 221b are abutted, that is, there is no blocking of the first side plate 220 between the two adjacent lamp beads 320, and this arrangement enables light to be uniformly irradiated on each position on the optical assembly 400. In this embodiment, it emits out to disperse according to the light in lamp pearl 320, with the crescent that the radial width of the orientation of trompil 221 direction set up, avoid light can be blocked by the inner wall of trompil 221 for more light can be worn out from second hole 221b, thereby reinforcing backlight 300's light intensity, reduce the loss of light, and then improve whole luminance. The inner wall of the opening 221 in the shape also has a certain light reflection capability, and can reflect light rays emitted to the inner wall of the opening 221, so that the light rays are emitted towards the optical assembly 400, a light diffusion effect is achieved, and the light utilization rate is improved.

Specifically, a reflective layer 223 is further disposed on an inner wall of the opening 221, and the reflective layer 223 completely wraps the inner wall of the opening 221, that is, the reflective layer 223 covers a side surface of a circular truncated cone of the opening 221; the reflective layer 223 is made of a reflective material, which may be the same as the reflective sheet 410 of the optical assembly 400, and the reflective layer 223 has a better reflective performance.

Although its lamp pearl 320 has the ability of sending light towards a certain angle, the light that this lamp pearl 320 sent is the scattering form, can have the condition that more large-angle light jets into the inner wall of trompil 221, and in this embodiment, be provided with reflective layer 223 at the inner wall of trompil 221 correspondingly, this reflective layer 223 is with the light reflection of directive trompil 221 inner wall, and because this reflective layer 223 corresponds the inner wall setting of trompil 221, have certain inclination, and then can be with this light reflection to optical component 400 in, make the light loss that this lamp pearl 320 sent less, improve light utilization. To a certain extent, the overall power consumption of the backlight module 100 can also be reduced. In the present embodiment, the shape of the opening 221 is not limited, and may be a circular hole or a square hole, or may be other shapes, and is provided according to actual needs. However, for the reflective layer 223, in combination with the radial width of the opening 221 gradually decreasing toward the lamp panel 310, the minimum radial width of the opening 221 is greater than the radial width of the lamp bead 320, so that light rays with a large angle emitted by the lamp bead 320 can be reflected to the optical assembly 400, thereby increasing the brightness of the backlight module 100. In this scheme, can also set up lamp pearl 320 on the focus that the reflector 223 received light, its purpose also is in order to make more light can enter into optical component 400.

Specifically, the backplane 200 further includes a second side plate 222, one end of the second side plate 222 is connected to the end of the first side plate 220 away from the bottom plate 210, the other end extends in the direction away from the optical assembly 400, the second side plate 222 is parallel to the bottom plate 210, the first side plate 220 is perpendicular to the second side plate 222, the lamp panel 310 is abutted to the surface of the first side plate 220 away from the optical assembly 400, and the lamp panel 310 is abutted to the surface of the second side plate 222 close to the lamp panel 310. In the embodiment, the second side plate 222 is arranged on the first side plate 220, the first side plate 220 is perpendicular to the second side plate 222, the side surface of the lamp panel 310 is abutted against the second side plate 222, and the bottom surface of the lamp panel 310 is abutted against the first side plate 220, so that the lamp panel 310 can be aligned and attached along the second side plate 222 in the assembling process, and the manufacturing process is optimized; meanwhile, the second side plate 222 can also play a role of carrying the display panel 500.

Specifically, the lamp panel 310 is a flexible lamp panel 310, the flexible lamp panel 310 and the first side plate 220 are provided with the double faced adhesive tape 230, the lamp panel 310 is fixed by the double faced adhesive tape 230, the double faced adhesive tape 230 also has a light shielding function, and under the condition that a gap exists between the radial width of the opening 221 and the lamp bead 320, the opening 221 is prevented from being too large, so that light leakage from the opening 221 is prevented, and the light leakage phenomenon is prevented; of course, a double-sided tape 230 may also be disposed between the second side board 222 and the lamp board 310. It should be noted that, the backplane 200 is generally used as a ground terminal, and a ground line on the display panel 500 needs to be connected to the backplane 200, and often static electricity will also be conducted to the backplane 200, so as to avoid the influence of static electricity on the flexible lamp panel 310, the double-sided adhesive tape 230 also has a certain insulating property, and the backplane 200 is isolated from the flexible lamp panel 310 by the double-sided adhesive tape 230.

Specifically, the optical assembly 400 includes a reflective sheet 410, a light guide plate 420, and a protective layer 430, wherein the reflective sheet 410 is disposed on the bottom plate 210, the light guide plate 420 is disposed on the reflective sheet 410, the protective layer 430 is disposed on the light guide plate 420, the opening 221 is disposed on the first side plate 220 corresponding to the light guide plate 420, and the light guide plate 420 converts the linear light emitted by the lamp bead 320 into the planar light to be emitted.

Specifically, the thickness of first curb plate 220 equals the length of lamp pearl 320, make lamp pearl 320 not outstanding in first curb plate 220, as above, its lamp pearl 320 has the ability of sending light towards a certain angle, but the light that this lamp pearl 320 sent is the scattering form, can have more wide-angle light, light can also jet out towards bottom plate 210 and display panel 500's direction except can shooting out towards the inner wall of trompil 221, this embodiment sets up the thickness of first curb plate 220 to be equal to the length of lamp pearl 320, make the wide-angle light towards bottom plate 210 and display panel 500 direction that lamp pearl 320 jetted out can both pass through reflection stratum 223 reflection back, shoot into optical component 400, improve light utilization.

Specifically, lamp pearl 320 sets up on lamp plate 310 through the welding, and lamp pearl 320 is lamp pearl 320's leg with lamp plate 310's welding position, the leg is located backplate 200 outside, and this application comes the temperature of monitor measurement lamp pearl 320 through lamp pearl 320's leg, and this leg is lamp pearl 320's main heat dissipation position, sets up its outside rear at backplate 200, and the produced heat of lamp pearl 320 can in time be in time dispelled outside backplate 200 through this leg, has avoided the temperature to pile up in backplate 200, improves display effect, increases life.

Example two:

fig. 6 is a schematic cross-sectional view of a backlight module 100 according to a second embodiment of the present disclosure, fig. 7 is a schematic top view of a first side plate 220 according to the second embodiment of the present disclosure, the backlight module 100 includes an optical assembly 400, a back plate 200 and a backlight source 300, the back plate 200 includes a bottom plate 210, the first side plate 220 and a second side plate 222, the bottom plate 210 is bent toward a light exit surface of a display panel 500 and extends to form the first side plate 220, the first side plate 220 is perpendicular to the bottom plate 210, one end of the second side plate 222 is connected to one end of the first side plate 220 away from the bottom plate 210, the other end extends in a direction away from the optical assembly 400, the second side plate 222 is parallel to the bottom plate 210, and the second side plate 222 abuts against the display panel 500; the bottom plate 210, the first side plate 220 and the second side plate 222 wrap the optical assembly 400, a plurality of holes 221 are uniformly formed in the first side plate 220, and the intervals of the holes 221 are equal. Backlight 300 includes lamp plate 310 and lamp pearl 320, lamp pearl 320 sets up on the lamp plate 310, lamp plate 310 sets up first curb plate 220 is kept away from one side fixed connection of optical component 400 sets up lamp pearl 320 partially at least in trompil 221. The opening 221 is a square opening 221, an inner wall of the square opening 221 has a first surface 2211, a second surface 2212, a third surface 2213 and a fourth surface 2214, one surface close to the bottom plate 210 is the first surface 2211, the first surface 2211 and the third surface 2213 are two opposite surfaces, the second surface 2212 and the fourth surface 2214 are two opposite surfaces, in addition, in the direction towards the optical assembly 400, the distance between the first surface 2211 and the third surface 2213 is gradually reduced, and the distance between the second surface 2212 and the fourth surface 2214 is gradually increased.

This embodiment is through setting up this square trompil 221 for during the light that lamp pearl 320 jetted out can concentrate kicking into optical assembly 400, avoided during the unable whole optical assembly 400 that shines of light that lamp pearl 320 jetted out, can't satisfy the luminance demand, need not adopt the method that increases lamp pearl 320 quantity or lamp pearl 320 overload use again, lead to the problem that the cost increases or life subtracts the weak point. Of course, in this embodiment, the reflective layer 223 may be disposed on the inner wall of the square opening 221 to reflect the light emitted to the inner wall of the square opening 221 into the optical assembly 400, so as to enhance the diffusion effect of the square opening 221 and improve the light utilization rate.

As shown in fig. 8, fig. 8 discloses a schematic plan view of a backlight 300, the backlight 300 includes a lamp panel 310 and a plurality of lamp beads 320 arranged on the lamp panel 310, two ends of the lamp panel 310, which are farthest from each other, are respectively provided with a protrusion, the protrusion is designed as a buckle, a clamping groove is arranged on the first side plate 220 corresponding to the position of the buckle, and when the backlight 300 is assembled, the buckle is clamped and fixed with the clamping groove, so that the backlight 300 is fixed on the first side plate 220. This design need not set up the glue film between first curb plate 220 and lamp plate 310 and fix, when damage appears in lamp plate 310, conveniently dismantles the maintenance.

Example three:

as shown in fig. 9, fig. 9 is a schematic cross-sectional view of a display device according to a third embodiment of the present application, where the display device includes a display panel 500 and the backlight module 100 provided in any of the above embodiments, and the backlight module 100 carries the display panel 500 and provides a light source for the display panel 500. The technical scheme of the present application can be widely applied to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, and MVA (Multi-Domain Vertical Alignment) display panel, and all of them can be applied to the above scheme.

It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.

The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.

Claims

1. A backlight module includes: an optical component, a back plate and a backlight source, wherein the back plate comprises a bottom plate and a first side plate, the first side plate is perpendicular to the bottom plate, the bottom plate and the first side plate wrap the optical component,

a plurality of holes are formed in the first side plate;

the backlight includes lamp plate and a plurality of lamp pearl, and is a plurality of the lamp pearl sets up on the lamp plate, the lamp plate sets up first curb plate is kept away from one side of optical component, the lamp pearl is at least partly to be set up in the open pore.

2. The backlight module as claimed in claim 1, wherein the number of the openings is the same as the number of the lamp beads, the openings are arranged in one-to-one correspondence with the lamp beads, and the intervals of the plurality of openings are equal.

3. The backlight module as claimed in claim 1, wherein there are m openings, there are n beads in each opening, and m × n beads are natural numbers greater than 0.

4. The backlight module according to any one of claims 1 to 3, wherein the radial width of the opening is gradually reduced towards the lamp panel, and the minimum radial width of the opening is greater than the radial width of the lamp beads.

5. The backlight module according to claim 1, wherein the back plate further comprises a second side plate, one end of the second side plate is connected to one end of the first side plate away from the bottom plate, the other end extends in a direction away from the optical assembly, the second side plate is parallel to the bottom plate, the first side plate and the second side plate are perpendicular to each other, the lamp panel is abutted to one surface of the first side plate away from the optical assembly, and the lamp panel is abutted to one surface of the second side plate close to the lamp panel.

6. The backlight module according to claim 5, wherein the lamp panel is a flexible lamp panel, and a double-faced adhesive tape is disposed between the flexible lamp panel and the first side plate, and the double-faced adhesive tape fixes the flexible lamp panel on the first side plate.

7. The backlight module as claimed in claim 4, wherein a reflective layer is disposed on an inner wall of the opening for reflecting light.

8. The backlight module according to any one of claims 1 to 3, wherein the opening is a square opening, the inner wall of the square opening has a first surface, a second surface, a third surface and a fourth surface, the surface close to the bottom plate is the first surface, the first surface and the third surface are opposite surfaces, the second surface and the fourth surface are opposite surfaces, the distance between the first surface and the third surface is gradually reduced and the distance between the second surface and the fourth surface is gradually increased in a direction toward the optical assembly.

9. The backlight module of claim 1, wherein two sides of the lamp panel are provided with a fastening structure, a position of the first side plate corresponding to the fastening structure is provided with a slot, and the fastening structure and the slot cooperate with each other to fix the lamp panel.

10. A display device, comprising: a display panel and a backlight module according to any one of claims 1 to 9, said backlight module providing a light source for said display panel.