CN109613755B - Backlight module and display device thereof - Google Patents

Abstract

The application provides a backlight module and a display device thereof, wherein the backlight module comprises an optical diaphragm; a backing sheet, comprising: a base plate; a sidewall connected to the bottom plate and carrying the optical film; the fixing structure is arranged between the first edge of the optical film and the adjacent side wall of the optical film, so that the first edge of the optical film is fixedly arranged on the back plate; the second edge of the optical diaphragm is provided with a first magnetic unit, the side wall is provided with a second magnetic unit, the position of the second magnetic unit is adjacent to the first magnetic unit, the first edge and the second edge of the optical diaphragm are different in position, and the second magnetic unit magnetically attracts the first magnetic unit, so that the second edge of the optical diaphragm is fixedly arranged on the back plate.

Description

Backlight module and display device thereof

Technical Field

The present disclosure relates to the field of optical film configuration technologies, and in particular, to a backlight module and a display device thereof.

Background

The liquid crystal display mainly comprises a backlight module and a liquid crystal display panel; the liquid crystal display panel does not emit light, and displays an image picture mainly through a display light source provided by the backlight module.

In the existing direct type backlight module, the diffusion plate is fixed on the back plate, the optical film is configured on the frame of the backlight module, the used technology is not limited, the riveting column or the clamping groove is formed on the back plate, the optical film is positioned on the back plate through the riveting column or the clamping groove, and then the optical film is fixed on the back plate by using double-sided adhesive. Or the optical diaphragm is fixed on the back plate by matching riveting columns of the hangers or hooking specific positions of the back plate by using the positioning hooks.

However, when the display is subjected to an impact or vibration test, the optical film is fixed by riveting the stud and the double-sided tape, or fixed by using the hanging lug and the positioning hook, so that the thermal expansion of the optical film is limited. When the optical film expands due to heating, the size of the optical film changes, and the optical film is easy to warp or arch to generate wavy bending, so that the optical quality of the liquid crystal display is influenced. Similarly, the above-mentioned problems also exist in the display using the edge-type backlight module.

Disclosure of Invention

An objective of the present application is to provide a backlight module and a display device thereof, which fix an optical film by a magnetic attraction manner.

The purpose of the application and the technical problem to be solved are realized by adopting the following technical scheme. According to the present application, a backlight module comprises: an optical film; a backing sheet, comprising: a base plate; a sidewall connected to the bottom plate and carrying the optical film; the fixing structure is arranged between the first edge of the optical film and the adjacent side wall of the optical film, so that the first edge of the optical film is fixedly arranged on the back plate; a first magnetic unit is arranged at the second edge of the optical diaphragm, a second magnetic unit is arranged on the side wall, the position of the second magnetic unit is adjacent to the first magnetic unit, the first edge and the second edge of the optical diaphragm are different, and the second magnetic unit magnetically attracts the first magnetic unit, so that the second edge of the optical diaphragm is fixedly arranged on the back plate; the first magnetic unit and the second magnetic unit are made of magnetic materials; or, one of the first magnetic unit and the second magnetic unit is made of a magnetic material, and the other one of the first magnetic unit and the second magnetic unit is made of a metal material; or, the first magnetic unit is made of a magnetic material or a metal material, and the second magnetic unit is an electromagnet module.

The purpose of the application and the technical problem to be solved can be further realized by adopting the following technical measures.

In an embodiment of the present application, the first magnetic unit is in a film shape and is attached to the second edge of the optical film.

In an embodiment of the present application, the first magnetic unit and the second magnetic unit are made of magnetic materials.

In an embodiment of the present application, one of the first magnetic unit and the second magnetic unit is a magnetic material, and the other is a metal material.

In an embodiment of the present application, the first magnetic unit is made of a magnetic material or a metal material, and the second magnetic unit is an electromagnet module.

In an embodiment of the present application, the magnetic material is selected from a group consisting of iron, cobalt, nickel and alloys thereof.

In one embodiment of the present application, the magnetic material has a particle size of less than 100 microns.

In an embodiment of the present application, the optical film includes a multi-layer film, and a part or all of a second edge of the multi-layer film is provided with the second magnetic unit.

In an embodiment of this application, the optics diaphragm includes the multilayer diaphragm, the multilayer diaphragm includes top layer diaphragm and bottom diaphragm, the top layer diaphragm is provided with the third magnetic unit, the bottom diaphragm is provided with the fourth magnetic unit, the third magnetic unit with the fourth magnetic unit sets up the position and corresponds each other, the third magnetic unit with fourth magnetic unit magnetism adsorbs each other, makes the restriction of multilayer diaphragm is fixed in top layer diaphragm with between the bottom diaphragm.

In an embodiment of the present application, the second edge of the optical film has a lug, and the first magnetic unit is disposed on the lug.

In an embodiment of the present application, the second edge of the top film has a plurality of lugs, and the first magnetic unit and the third magnetic unit are disposed on the plurality of lugs in an inserting manner.

In an embodiment of the present application, the third magnetic unit and the fourth magnetic unit are in a film shape and are respectively attached to the top diaphragm and the bottom diaphragm.

In an embodiment of the present application, the optical film includes a multi-layer film, a plurality of fifth magnetic units are disposed on the multi-layer film, and the fifth magnetic units are attracted to each other, so that the positions of the multi-layer film are fixed to each other.

In an embodiment of the present application, the fifth magnetic element is attached to the optical film in a film shape.

In an embodiment of the present application, the fifth magnetic unit is made of a transparent magnetic material.

In an embodiment of the present application, the fifth magnetic unit covers the entire surface of the optical film.

In an embodiment of the present application, the fifth magnetic unit covers a periphery of the optical film.

In an embodiment of the present application, the fifth magnetic unit covers a middle region of the optical film.

In an embodiment of the present application, the first edge of the optical film is a top edge of the optical film, and the second edge of the optical film includes at least one of a side edge and a bottom edge of the optical film.

Another object of the present application is a backlight module, comprising: the optical diaphragm comprises a plurality of layers of diaphragms, wherein each layer of diaphragm comprises a top diaphragm and a bottom diaphragm; a backing sheet, comprising: a base plate; a sidewall connected to the bottom plate and carrying the optical film; the fixing structure is arranged between the first edge of the optical film and the adjacent side wall of the optical film, so that the first edge of the optical film is fixedly arranged on the back plate; a first magnetic unit is arranged at a second edge of the optical diaphragm, a second magnetic unit is configured on the side wall, a third magnetic unit is arranged on the top diaphragm, a fourth magnetic unit is arranged on the bottom diaphragm, the second magnetic unit is adjacent to the first magnetic unit, the first edge and the second edge of the optical diaphragm are different in position, the third magnetic unit and the fourth magnetic unit are arranged in corresponding positions, the second magnetic unit magnetically attracts the first magnetic unit, so that the second edge of the optical diaphragm is fixedly arranged on the back plate, and the third magnetic unit and the fourth magnetic unit are magnetically attracted to each other, so that the multilayer diaphragm is limited and fixed between the top diaphragm and the bottom diaphragm; the first magnetic unit and the second magnetic unit are made of magnetic materials; or, one of the first magnetic unit and the second magnetic unit is made of a magnetic material, and the other one of the first magnetic unit and the second magnetic unit is made of a metal material; or, the first magnetic unit is made of a magnetic material or a metal material, and the second magnetic unit is an electromagnet module.

Another object of the present application is a display device including: a display panel; and a backlight module as any one of the previous.

The method can avoid the situation that the optical film is warped or arched so as to avoid the problem of uneven brightness of the picture; secondly, the application can be applied to various display devices with backlight modules and has higher applicability.

Drawings

FIG. 1a is a schematic view of an exemplary display device configuration of a direct-type backlight module.

FIG. 1b is a schematic diagram of an exemplary optical film fixed to a backplate by a positioning hook.

FIG. 1c is an enlarged view of a portion of FIG. 1 b.

FIG. 1d is a schematic diagram of an exemplary optical film secured to a backplate by rivets.

FIG. 1e is a schematic diagram of an exemplary optical film structure.

FIG. 1f is a schematic view of an exemplary display device configuration of a direct-type backlight module.

FIG. 1g is a schematic diagram of exemplary optical film warpage.

Fig. 2a is a schematic structural diagram illustrating a backlight module according to an embodiment of the present invention.

Fig. 2b is a partially enlarged schematic view of fig. 2 a.

FIG. 2c is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention.

FIG. 2d is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention.

FIG. 2e is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention.

FIG. 2f is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention.

FIG. 2g is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention.

FIG. 2h is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention.

FIG. 2i is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention.

FIG. 2j is a schematic diagram illustrating an embodiment of a method for configuring a magnetic unit on an optical film according to the present invention.

FIG. 2k is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings, which illustrate specific embodiments that can be used to practice the present application. In the present application, directional terms such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", and the like are merely referring to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding, and is in no way limiting.

The drawings and description are to be regarded as illustrative in nature, and not as restrictive. In the drawings, elements having similar structures are denoted by the same reference numerals. In addition, the size and thickness of each component shown in the drawings are arbitrarily illustrated for understanding and ease of description, but the present application is not limited thereto.

In the drawings, the thickness of layers, films, panels, regions, etc. are exaggerated for clarity. In the drawings, the thickness of some layers and regions are exaggerated for understanding and convenience of description. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present.

In addition, in the description, unless explicitly described to the contrary, the word "comprise" will be understood to mean that the recited components are included, but not to exclude any other components. Further, in the specification, "on.

To further illustrate the technical means and effects of the present application for achieving the intended application purpose, the following embodiments are combined with the accompanying drawings and embodiments to provide a backlight module and a display device thereof, and the embodiments, structures, features and effects thereof

FIG. 1a is a schematic view of an exemplary display device configuration of a direct-type backlight module. Referring to fig. 1a, a display device includes: a backlight module 10 and a display panel 20.

The backlight module 10 includes a back plate 11, a backlight source 12, a reflective sheet 13, a diffusion plate 14, an optical film 40 disposed on the diffusion plate 14, and a middle frame 15 fastened on the back plate 11. The back plate 11 includes a bottom plate 111 and a sidewall 112 vertically connected to the bottom plate 111, wherein the sidewall 112 and the bottom plate 111 form an accommodating space. The backlight source 12, the reflective sheet 13, the diffusion plate 14 and the optical film 40 are disposed in the accommodating space. The backlight 12 is disposed on the bottom plate 111 of the back plate 11, and the reflective sheet 13 is disposed on the bottom plate 111 and adjacent to the backlight 12. The diffusion plate 14 is fixedly disposed above the backlight 12, and the optical film 40 is disposed on the diffusion plate 14. The middle frame 15 is disposed above the backlight module 10 and forms a locking relationship with the back plate 11. The middle frame 15 is provided with a receiving portion in which the display panel 20 is received.

Fig. 1b is a schematic diagram illustrating an exemplary optical film fixed to a backplate by a positioning hook, and fig. 1c is a partially enlarged schematic diagram of fig. 1 b. The positioning hook 17 is a double-sided hook, one end of the positioning hook penetrates through and hooks the first edge 41 of the optical film 40, and the other end of the positioning hook hooks the frame portion of the back plate 11. The optical film 40 is fixed on the back plate 11 by the positioning hooks 17.

Fig. 1d is a schematic diagram of an exemplary optical film fixed to a backplate by a rivet, and fig. 1e is a schematic diagram of an exemplary optical film structure. The rivet 113 is formed on the back plate 11, a lug 43 is disposed on the edge of the optical film 40, and the lug 43 is provided with a through hole 44 for the rivet 113 to pass through, or the lug 43 is designed to be a hanging lug structure, so that the optical film 40 is fixed on the back plate 11 by hanging, buckling or related technology combination.

Fig. 1f is a schematic view of an exemplary configuration of a display device of a direct-type backlight module, please refer to fig. 1a for understanding. Referring to fig. 1f, the backlight 12 is disposed on the back plate 11 or the inner side of the middle frame 15, and the diffuser plate 14 is replaced by a light guide plate 16.

FIG. 1g is a schematic diagram of exemplary optical film warpage. When performing an impact or vibration test on the lcd, the optical film 40 is fixed by the rivet 113 and the double-sided tape (not shown), or fixed by the hanging lug and the positioning hook 17, which limits the thermal expansion of the optical film 40. When the optical film 40 expands due to heat, the size of the optical film 40 changes, and the optical film is easily warped or arched to generate wavy bending, thereby affecting the optical quality of the liquid crystal display. Although fig. 1g illustrates a display device with a direct-type backlight module, such problems exist in any display device with a direct-type backlight module or a side-type backlight module.

Fig. 2a is a schematic view illustrating a structure of a backlight module according to an embodiment of the present invention, and fig. 2b is a partially enlarged view of fig. 2 a. The structure of the related display device should be better understood with reference to fig. 1a to 1 g. In an embodiment of the present application, the backlight module 10 includes: optical film 40, back plate 11, fixed knot construct. The back plate 11 includes: a bottom plate 111 and side walls 112. The side wall 112 is connected to the bottom plate 111 and carries the optical film 40. The fixing structure is disposed between the first edge 41 of the optical film 40 and the adjacent sidewall 112, so that the first edge 41 of the optical film 40 is fixedly disposed on the back plate 11. In some embodiments, the fastening structure includes, but is not limited to, a combination of studs 113 and perforations 44.

A first magnetic unit 51 is disposed on the second edge 42 of the optical diaphragm 40, a second magnetic unit 52 is disposed on the sidewall 112, the second magnetic unit 52 is adjacent to the first magnetic unit 51, the first edge 41 and the second edge 42 of the optical diaphragm 40 are at different positions, and the second magnetic unit 52 magnetically attracts the first magnetic unit 51, so that the second edge 42 of the optical diaphragm 40 is fixed on the back plate 11.

In some embodiments, the first magnetic unit 51 and the second magnetic unit 52 are magnetic materials.

In some embodiments, one of the first magnetic unit 51 and the second magnetic unit 52 is a magnetic material, and the other is a metal material.

In some embodiments, the first magnetic unit 51 is a magnetic material or a metal material, and the second magnetic unit 52 is an electromagnet module.

In some embodiments, the magnetic material is selected from the group consisting of iron, cobalt, nickel, and alloys thereof.

In some embodiments, the magnetic material has a particle size of less than 100 microns.

In some embodiments, the first magnetic unit 51 is in the form of a film and is attached to the second edge 42 of the optical film 40.

Fig. 2c is a schematic structural diagram illustrating an optical film configured with a magnetic unit according to an embodiment of the method of the present invention, please refer to fig. 1a to fig. 2b for understanding. In some embodiments, the optical film 40 includes, but is not limited to, a Diffusion plate 14(Diffusion), Prism (Prism), shade (Shielding Tape) …, and the like.

In some embodiments, the optical film 40 comprises a multi-layer film, and as shown in fig. 2c, a portion of the second edge 42 of the multi-layer film is provided with the second magnetic unit 52.

In some embodiments, all of the second edges 42 of the multi-layered membrane are provided with the second magnetic elements 52.

FIG. 2d is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention. In some embodiments, the optical film 40 includes a plurality of layers of films, the plurality of layers of films includes a top layer of films 40a and a bottom layer of films 40b, the top layer of films 40a is provided with a third magnetic unit 53, the bottom layer of films 40b is provided with a fourth magnetic unit 54, the third magnetic unit 53 and the fourth magnetic unit 54 are disposed at positions corresponding to each other, and the third magnetic unit 53 and the fourth magnetic unit 54 are magnetically attracted to each other, so that the plurality of layers of films are constrained and fixed between the top layer of films 40a and the bottom layer of films 40 b. As shown in fig. 2d, the dotted lines represent the directions of magnetic attraction.

In some embodiments, the third magnetic unit 53 and the fourth magnetic unit 54 are in the form of films and are respectively attached to the top membrane 40a and the bottom membrane 40 b.

FIG. 2e is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention. In some embodiments, the second edge 42 of the optical film 40 has a ledge 43, and the first magnetic unit 51 is disposed on the ledge 43.

FIG. 2f is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention. In some embodiments, the second edge 42 of the top film sheet 40a has a plurality of lugs 43, and the first magnetic units 51 and the third magnetic units 53 are disposed on the plurality of lugs 43 in an alternating manner, and are not limited to a continuous alternating manner or an intermittent alternating manner.

FIG. 2g is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention. In some embodiments, the optical film 40 includes a multi-layer film, a plurality of fifth magnetic units 55 are disposed on the multi-layer film, and the plurality of fifth magnetic units 55 are attracted to each other to fix the multi-layer film in position with respect to each other.

In some embodiments, the fifth magnetic unit 55 is attached to the optical film 40 in a film shape.

In some embodiments, the fifth magnetic unit 55 is made of a transparent magnetic material.

In some embodiments, the fifth magnetic element 55 covers the entire surface of the optical film 40, as shown in fig. 2 g. The fifth magnetic unit 55 covers a portion of the surface of the optical film 40, optionally including or excluding other magnetic units. The fifth magnetic unit 55 selectively has the corresponding functions of the other magnetic units according to the covering position and the requirement of the designer.

FIG. 2h is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention. In some embodiments, the fifth magnetic unit 55 covers the middle region of the optical film 40. As shown in fig. 2h, a plurality of magnetic film layers (i.e. the fifth magnetic unit 55) are disposed in the middle region of the optical film 40 in a 9-point method, and the shape includes, but is not limited to, a circle, a square, a triangle, a polygon, etc. The configuration method further includes, but is not limited to, a 5-point method, a 6-point method, and the like.

FIG. 2i is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention. In some embodiments, the fifth magnetic unit 55 covers the periphery of the optical film 40.

In some embodiments, the fifth magnetic unit 55 is disposed around the optical film 40 in a continuous or discontinuous manner.

In some embodiments, the first edge 41 of the optical film 40 is the top edge of the optical film 40, and the second edge 42 of the optical film 40 configured by the first magnetic unit 51 includes at least one of the side edge and the bottom edge of the optical film 40. As shown in fig. 2e, the first magnetic unit 51 is disposed at the bottom edge of the optical film 40.

FIG. 2j is a schematic diagram illustrating an embodiment of a method for configuring a magnetic unit on an optical film according to the present invention. The first magnetic unit 51 is disposed at a side of the optical film 40.

FIG. 2k is a schematic diagram illustrating an embodiment of a magnetic unit configured on an optical film according to the method of the present invention. The first magnetic unit 51 is disposed at the bottom and side of the optical film 40.

Although the first magnetic unit 51, the third magnetic unit 53 and the fourth magnetic unit 54 are disposed on the lug 43 as required, in some embodiments, the lug 43 is not disposed on the bottom edge and the side edge of the optical film 40, and the related magnetic unit is disposed on the edge of the optical film.

In some embodiments, the optical film is configured with the magnetic unit, and is suitable for a direct-type backlight module.

Although the above illustration is a direct-type backlight module, in some embodiments, the optical film is configured with a magnetic unit, which is suitable for a side-type backlight module.

In some embodiments, a backlight module 10 comprises: an optical film 40 comprising a multi-layer film including a top layer film 40a and a bottom layer film 40 b; the back plate 11 includes: a bottom plate 111 and side walls 112. The side wall 112 is connected to the bottom plate 111 and carries the optical film 40; a fixing structure disposed between the first edge 41 of the optical film 40 and the adjacent sidewall 112, so that the first edge 41 of the optical film 40 is fixedly disposed on the back plate 11; the second edge 42 of the optical film 40 is provided with a first magnetic unit 51, the sidewall 112 is provided with a second magnetic unit 52, the top film 40a is provided with a third magnetic unit 53, the bottom film 40b is provided with a fourth magnetic unit 54, the second magnetic unit 52 is adjacent to the first magnetic unit 51, the first edge 41 and the second edge 42 of the optical film 40 are different in position, the second magnetic unit 52 magnetically attracts the first magnetic unit 51, so that the second edge 42 of the optical film 40 is fixedly arranged on the back plate 11, the third magnetic unit 53 and the fourth magnetic unit 54 are magnetically attracted to each other, and the multilayer film is limited and fixed between the top film 40a and the bottom film 40 b.

In some embodiments, a display device includes: a backlight module 10 and a display panel 20. Wherein the backlight module 10 is as described in any one of the previous paragraphs.

In some embodiments, the display panel of the present invention may be, for example, a liquid crystal display panel, but is not limited thereto, and may also be a curved display panel or other related types of display panels.

In some embodiments, the display panel of the present application may also be a TN (Twisted Nematic), STN (Super Twisted Nematic), OCB (Optically Compensated bend alignment) display panel, for example.

The method can avoid the situation that the optical film is warped or arched so as to avoid the problem of uneven brightness of the picture; secondly, the application can be applied to various display devices with backlight modules and has higher applicability.

The terms "in some embodiments" and "in various embodiments" are used repeatedly. The terms generally do not refer to the same embodiment; it may also refer to the same embodiment. The terms "comprising," "having," and "including" are synonymous, unless the context dictates otherwise.

Although the present application has been described with reference to specific embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

Claims (8)

1. A backlight module, comprising:

an optical film;

a backing sheet, comprising:

a base plate;

the side wall is connected to the bottom plate and bears the optical diaphragm, and the side wall and the bottom plate form an accommodating space for arranging the optical diaphragm;

the fixing structure is arranged between the first edge of the optical film and the adjacent side wall of the optical film, so that the first edge of the optical film is fixedly arranged on the back plate; the fixing structure is a combination of a riveting column and a through hole;

a first magnetic unit is arranged at the second edge of the optical diaphragm, a second magnetic unit is arranged on the side wall, the position of the second magnetic unit is adjacent to the first magnetic unit, the first edge and the second edge of the optical diaphragm are different, and the second magnetic unit magnetically attracts the first magnetic unit, so that the second edge of the optical diaphragm is fixedly arranged on the back plate;

the first magnetic unit and the second magnetic unit are made of magnetic materials; or, one of the first magnetic unit and the second magnetic unit is made of a magnetic material, and the other one of the first magnetic unit and the second magnetic unit is made of a metal material; or, the first magnetic unit is made of a magnetic material or a metal material, and the second magnetic unit is an electromagnet module; the first magnetic unit is in a film shape and is attached to the second edge.

2. The backlight module of claim 1, wherein the magnetic material is selected from the group consisting of iron, cobalt, nickel and alloys thereof.

3. The backlight module of claim 2, wherein the magnetic material has a particle size of less than 100 microns.

4. The backlight module of claim 1, wherein the optical film comprises a multi-layered film, and a part or all of the second edge of the multi-layered film is provided with the first magnetic unit.

5. The backlight module of claim 1, wherein the first edge of the optical film is a top edge of the optical film, and the second edge of the optical film comprises at least one of a side edge and a bottom edge of the optical film.

6. The backlight module of claim 1, wherein the second edge of the optical film has a ledge, and the first magnetic unit is disposed on the ledge.

7. A backlight module, comprising:

the optical diaphragm comprises a plurality of layers of diaphragms, wherein each layer of diaphragm comprises a top diaphragm and a bottom diaphragm;

a backing sheet, comprising:

a base plate;

the side wall is connected to the bottom plate and bears the optical diaphragm, and the side wall and the bottom plate form an accommodating space for arranging the optical diaphragm;

the fixing structure is arranged between the first edge of the optical film and the adjacent side wall of the optical film, so that the first edge of the optical film is fixedly arranged on the back plate; the fixing structure is a combination of a riveting column and a through hole;

a first magnetic unit is arranged at a second edge of the optical diaphragm, a second magnetic unit is configured on the side wall, a third magnetic unit is arranged on the top diaphragm, a fourth magnetic unit is arranged on the bottom diaphragm, the second magnetic unit is adjacent to the first magnetic unit, the first edge and the second edge of the optical diaphragm are different in position, the third magnetic unit and the fourth magnetic unit are arranged in corresponding positions, the second magnetic unit magnetically attracts the first magnetic unit, so that the second edge of the optical diaphragm is fixedly arranged on the back plate, and the third magnetic unit and the fourth magnetic unit are magnetically attracted to each other, so that the multilayer diaphragm is limited and fixed between the top diaphragm and the bottom diaphragm;

the first magnetic unit and the second magnetic unit are made of magnetic materials; or, one of the first magnetic unit and the second magnetic unit is made of a magnetic material, and the other one of the first magnetic unit and the second magnetic unit is made of a metal material; or, the first magnetic unit is made of a magnetic material or a metal material, and the second magnetic unit is an electromagnet module; the first magnetic unit is in a film shape and is attached to the second edge.

8. A display device, comprising:

a display panel; and

the backlight module of any one of claims 1 to 7.

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