CN214278577U

CN214278577U - Backlight module and display device

Info

Publication number: CN214278577U
Application number: CN202022584928.2U
Authority: CN
Inventors: 孙含嫣; 张明辉; 郑辉
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-09-24
Anticipated expiration: 2030-11-10

Abstract

The utility model provides a backlight module and display device belongs to and shows technical field. The utility model provides a backlight module, it includes: a back panel comprising a bottom wall and a side wall, the bottom wall and the side wall being connected and defining a receptacle of the back panel; a light guide plate disposed in the accommodating portion; the optical film is arranged on one side of the light guide plate, which is far away from the bottom wall; the rubber frame comprises a retaining wall and a bearing part, wherein the retaining wall and the side wall are arranged side by side and are arranged on one side of the side wall, which is far away from the light guide plate; the bearing part is connected with the retaining wall and is positioned on one side of the side wall and the optical membrane, which is far away from the bottom wall; wherein, the bearing part comprises a first surface deviating from the side wall and oppositely arranged with the retaining wall, and at least part of the position on the first surface protrudes to one side close to the retaining wall.

Description

Backlight module and display device

Technical Field

The utility model belongs to the display field, concretely relates to backlight module and display device.

Background

In the field of liquid crystal display, the main function of the backlight module is to provide a uniform and high-brightness luminous body for the liquid crystal panel, and the basic principle is to convert a commonly used linear or point luminous body into a high-brightness and uniformly distributed surface luminous body component through an effective light mechanism, so that the liquid crystal panel can display images. The backlight module is one of the key components of the liquid crystal display device, and the luminous effect of the backlight module directly influences the visual effect of the liquid crystal display panel. With the development of technology and the improvement of appearance requirements of consumers, the conventional backlight module with a front frame and a rear cover cannot meet the requirements of high-end consumers. In order to meet the higher demands of consumers, narrow bezel and ultra-thin displays are gradually developed. The structure of the backlight module directly affects the width and thickness of the frame of the display, and therefore, the focus is on improving the structure of the backlight module.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least, provide a backlight unit and display device.

In a first aspect, an embodiment of the present disclosure provides a backlight module, which includes:

a back panel comprising a bottom wall and a side wall, the bottom wall and the side wall being connected and defining a receptacle of the back panel;

a light guide plate disposed in the accommodating portion;

the optical film is arranged on one side of the light guide plate, which is far away from the bottom wall;

the rubber frame comprises a retaining wall and a bearing part, wherein the retaining wall and the side wall are arranged side by side and are arranged on one side of the side wall, which is far away from the light guide plate; the bearing part is connected with the retaining wall and is positioned on one side of the side wall and the optical membrane, which is far away from the bottom wall; wherein the content of the first and second substances,

the bearing part comprises a side wall and a first surface, wherein the first surface is arranged opposite to the retaining wall, and at least part of the position on the first surface protrudes to one side close to the retaining wall.

Wherein at least part of the first surface comprises a first sub-surface and a second sub-surface which are arranged opposite to the retaining wall, and a first sub-connecting surface for connecting the first sub-surface and the second sub-surface;

the first sub-surface and the second sub-surface are sequentially arranged along the direction deviating from the optical diaphragm, and the first sub-surface and the second sub-surface are different in the farthest distance between the retaining walls.

Wherein the first sub-surface width is smaller than the width of the second sub-surface in a direction away from the optical film sheet.

Wherein, the farthest distance between the first sub-surface and the retaining wall is greater than the farthest distance between the second sub-surface and the retaining wall.

Wherein the first sub-surface is substantially parallel to the second sub-surface.

Wherein at least part of the first surface comprises a first sub-surface, a second sub-surface, a third sub-surface, a first sub-connection surface for connecting the first sub-surface and the second sub-surface, and a second sub-connection surface for connecting the second sub-surface and the third sub-surface, which are arranged opposite to the retaining wall;

the first sub-surface, the second sub-surface and the third sub-surface are sequentially arranged along the direction deviating from the optical diaphragm, and the farthest distances from the first sub-surface, the second sub-surface and the third sub-surface to the retaining walls are different.

Wherein, the farthest distance between at least one of the first sub-surface and the third sub-surface and the retaining wall is greater than the farthest distance between the second sub-surface and the retaining wall.

Wherein at least one of the first and third sub-surfaces has a width smaller than a width of the second sub-surface in a direction away from the optical film sheet.

Wherein the first, second, and third sub-surfaces are substantially parallel.

Wherein the height of the first surface in the direction away from the optical film sheet is not less than 0.8 mm.

The bearing part comprises a second surface opposite to the optical film, and a dihedral angle is formed between an extending surface of the second surface and a plane where the optical film is located.

Wherein the dihedral angle is no greater than 5 °.

Wherein the first surface comprises a matte structure thereon.

The position, which is close to the retaining wall in a protruding mode, on the first surface surrounds the circumferential direction of the first surface.

The position, protruding to one side that is close to the barricade, on the first surface encircles the circumference of bearing part.

The backlight module further comprises a reflecting sheet arranged in the accommodating part and positioned on one side of the light guide plate departing from the optical film.

Wherein, a reinforcing rib is formed on the bottom wall; the width of the reinforcing rib is 0.2mm-1.5 mm. Wherein the first surface comprises at least one of a step surface, a groove surface, and a wave surface.

In a second aspect, an embodiment of the disclosure provides a display device, which includes any one of the backlight modules described above, and a display panel disposed on the carrier portion.

The display device comprises a display area, and the distance from the retaining wall to the boundary of the display area is not more than 7 mm.

Drawings

Fig. 1 is a schematic structural diagram of an exemplary display device.

Fig. 2 is a schematic diagram of a shadow of the display device shown in fig. 1.

Fig. 3 is a schematic structural diagram of a backlight module and a display panel according to an embodiment of the disclosure.

Fig. 4 is a schematic view of a first surface according to an embodiment of the disclosure.

Fig. 5 shows the correspondence between the light exit angle and the brightness.

Fig. 6 is a schematic diagram of a shadow of a display device to which the backlight module of the embodiment of the disclosure is applied.

Fig. 7 is a schematic view of another first surface of an embodiment of the present disclosure.

Fig. 8 is a schematic structural diagram of another backlight module and a display panel according to an embodiment of the disclosure.

Fig. 9 is a schematic structural diagram of another backlight module and a display panel according to an embodiment of the disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to facilitate an understanding of the contents of the embodiments of the present invention.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

FIG. 1 is a schematic diagram of an exemplary display device; as shown in fig. 1, the display device is divided into a display area Q1 and a peripheral area Q2 surrounding the display area Q1; the display device comprises a backlight module and a display panel 10 positioned on a light-emitting surface of the backlight module. Among them, the display panel 10 may include a first substrate and a second substrate that are oppositely disposed, and a liquid crystal layer formed between the first substrate and the second substrate. The first substrate includes but is not limited to an array substrate, and the second substrate includes but is not limited to a color film substrate. The backlight module comprises a back plate 1, a rubber frame 2, an outer frame 3, a light guide plate 5, a light source component, an optical diaphragm 6, a reflector plate 4 and the like. The back plate 1 includes a bottom wall 11 and a side wall 12, the bottom wall 11 and the side wall 12 are connected to define a containing portion, and the reflective sheet 4, the light guide plate 5 and the optical film 6 are disposed in the containing portion and sequentially disposed along a direction away from the bottom wall 11. The light source assembly may be an LED light bar disposed on the backlight sidewall 12 and opposite to at least one side of the light guide plate 5. The rubber frame 2 comprises a retaining wall 21 and a bearing part 22; the retaining wall 21 is arranged side by side with the side wall 12 of the back plate 1, and the bearing part 22 is connected with the retaining wall 21 and is positioned on the side of the side wall 12 of the back plate 1 and the side of the optical diaphragm 6 departing from the bottom wall 11 of the back plate 1; the carrying portion 22 of the glue frame 2 is used for carrying the display panel 10. The outer frame 3 is disposed outside the plastic frame 2 and the display panel 10 to fix the plastic frame 2 and the display panel 10.

The inventor found that, as the display device is narrowed, the distance from the outer edge of the rubber frame 2 to the display area Q1 of the display device is closer, in this case, after the light emitted through the light guide plate 5 is irradiated to the first surface S1 of the carrying part 22, a part of the light display area Q1 is emitted to enter human eyes, and meanwhile, a dark shadow is formed at the edge of the display screen, and in this case, a part of pixels in the display area Q1 of the display panel 10 is blocked, and the display of the display device is further affected. FIG. 2 is a schematic diagram of a shadow of the display device shown in FIG. 1; as can be seen from fig. 2, in the display device in the related art, after light is irradiated to the first surface S1 of the bearing portion 22, a dark shadow appears at the edge of the display area. Fig. 2 shows a dark shadow on the printed circuit board side of the display device, and the same problem may occur on the other sides of the display panel.

In view of the above problems, the following technical solutions are provided in the embodiments of the present disclosure.

In a first aspect, fig. 3 is a schematic structural diagram of a backlight module display panel 10 according to an embodiment of the disclosure; as shown in fig. 3, the present disclosure provides a backlight module, which is used in conjunction with a display panel 10 to form a display device. The backlight module comprises a back plate 1, a rubber frame 2, a reflector plate 4, a light guide plate 5, an optical diaphragm 6, an LED light bar and the like; wherein the back plate 1 comprises a bottom wall 11 and side walls 12; the bottom wall 11 of the back panel 1 is disposed opposite to the display panel 10, and the side wall 12 extends toward the display panel 10, is connected to the bottom wall 11, and defines a receiving portion. The reflection sheet 4, the light guide plate 5, and the optical film 6 are all disposed in the accommodating portion, and both are sequentially disposed in a direction away from the bottom wall 11. The rubber frame 2 comprises a retaining wall 21 and a bearing part 22; the retaining wall 21 is arranged side by side with the side wall 12 of the back plate 1, and the bearing part 22 is connected with the retaining wall 21 and is located on the side of the side wall 12 of the back plate 1 and the optical diaphragm 6 away from the bottom wall 11. The bearing part 22 includes a first surface S1 opposite to the retaining wall 21 and opposite to the side wall 12 of the back plate 1. Specifically, at least a portion of the first surface S1 of the bearing part 22 in the present embodiment protrudes toward the side close to the retaining wall 21 (hereinafter referred to as a concave position).

In the embodiment of the present disclosure, at least a portion of the position on the first surface S1 of the supporting portion 22 of the frame 2 of the backlight module protrudes to a side close to the retaining wall 21, that is, compared to the related art, at least a portion of the position on the first surface S1 can be moved to a plane close to the retaining wall 21, so that the optical path of the light irradiated by the illumination line to the concave position of the first surface S1 is elongated, the intensity of the light is weakened, and the light reflected to human eyes is reduced accordingly, thereby also effectively alleviating the problem of dark shadows.

Referring to fig. 3, in some embodiments, the maximum distance between the first surface S1 of the supporting portion 22 and the retaining wall 21 is not greater than 7mm, that is, the maximum width of the adhesive frame 2 is not greater than 7mm, so that the backlight module according to the embodiment of the disclosure is beneficial to realizing a narrow bezel. For example: the maximum distance of the distance from the first surface S1 of the bearing part 22 to the retaining wall 21 in some products is about 6 mm; further, the maximum distance of the distance from the first surface S1 of the bearing part 22 to the retaining wall 21 is not more than 5mm in some products. In the embodiment of the present disclosure, the maximum distance between the first surface S1 of the bearing part 22 and the retaining wall 21 may be set to be about 1.0-1.2mm, so as to achieve a narrow frame design as much as possible.

In some embodiments, the position of the first surface S1 protruding to the side close to the retaining wall 21 surrounds the circumferential direction, that is, the first surface S1 includes a circle of concave surface protruding to the side close to the retaining wall 21. Therefore, the reflection of the light irradiated on the first surface S1 to human eyes can be reduced as much as possible, and the occurrence of dark shadows on the display screen in the peripheral area Q2 of the display device can be effectively reduced. The first surface S1 includes a concave surface protruding toward the side close to the retaining wall 21.

In one example, fig. 4 is a schematic view of a first surface S1 of an embodiment of the present disclosure; as shown in fig. 3 and 4, the first surface S1 of the bearing portion 22 of the frame 2 is stepped in a cross section perpendicular to the plane of the optical film 6. The following description will be given taking as an example a case where the first surface S1 of the carrier part 22 has a first step in a cross section perpendicular to the plane of the optical film 6. Specifically, the first surface S1 of the bearing part 22 includes a first sub-surface S11 and a second sub-surface S12 disposed opposite to the retaining wall 21, and a first sub-connecting surface S13 for connecting the first sub-surface S11 and the second sub-surface S12. Wherein, the farthest distances from the first sub-surface S11 and the second sub-surface S12 to the retaining wall 21 are different. With continued reference to fig. 2, the farthest distance from the first sub-surface S11 to the retaining wall 21 is greater than the farthest distance from the second sub-surface S12 to the retaining wall 21. Most of the light emitted through the optical film 6 is irradiated onto the second sub-surface S12, and a small portion of the light is irradiated onto the first sub-surface S11, since the distance from the second sub-surface S12 to the retaining wall 21 is shortened compared to the conventional design, the optical path of the light irradiated onto the second sub-surface S12 is lengthened compared to that irradiated onto the first sub-surface S11, and the light intensity is weakened. Among the light rays irradiated onto the second sub-surface S12, the light rays with a small exit angle from the optical film 6 are reflected to the peripheral region through the second sub-surface S12 and absorbed by the black matrix in the peripheral region; the light with a large exit angle through the optical film 6 has relatively low luminance (corresponding relationship between the exit angle of the light and the luminance as shown in fig. 5), the optical path length of the light impinging on the second sub-surface S12 is further attenuated by the elongated light intensity, and the luminance is lower and is less noticeable to human eyes. Therefore, the quantity and the light intensity of the light rays which are irradiated to the bearing part 22 and reflected to human eyes can be effectively reduced, and the aims of eliminating and relieving shadows are fulfilled. In addition, as shown in fig. 4, the width W1 of the first sub-surface S11 may be smaller than the width W2 of the second sub-surface S12 in the direction away from the optical film 6, in this way, the light irradiated to the supporting portion 22 and reflected to the human eye may be effectively reduced. Fig. 6 is a schematic diagram of a shadow of a display device using the backlight module according to the embodiment of the disclosure, and it can be seen from fig. 6 that the shadow is obviously weakened.

For example: in some embodiments, the width W1 (hereinafter referred to as width) of the first sub-surface S11 in the direction away from the optical film 6 is not less than 0.8mm in some embodiments. The maximum width W of the first surface S1 of the carrier 22 is 2.1mm, the width W1 of the first sub-surface S11 is 0.9mm, and the width W2 of the second sub-surface S12 is 1.1 mm; the maximum width W of the first surface S1 of the supporting portion 22 is 2.3mm, the width W1 of the first sub-surface S11 is 1.1mm, and the width W2 of the second sub-surface S12 is 1.2mm, and the inventors verified that the problem of edge shading of the display panel 10 is significantly improved.

For example: with continued reference to fig. 3, in some embodiments, the first sub-surface S11 and the second sub-surface S12 are sequentially disposed in a direction away from the optical film 6, and the farthest distance from the first sub-surface S11 to the retaining wall 21 is greater than the farthest distance from the second sub-surface S12 to the retaining wall 21. The first sub-surface S11 and the second sub-surface S12 may be substantially parallel or parallel to the plane of the retaining wall 21, and the first sub-connecting surface S13 is substantially parallel or parallel to the plane of the optical film 6. Of course, the first sub-surface S11 and the second sub-surface S12 may also be at an angle with respect to the plane of the retaining wall 21.

In another example, fig. 6 is a schematic view of another first surface S1 of an embodiment of the present disclosure; as shown in fig. 5, the first surface S1 of the carrier part 22 of the frame 2 has a groove shape in a cross section perpendicular to the plane of the optical film 6. Specifically, the first surface S1 of the bearing portion 22 includes a first sub-surface S11, a second sub-surface S12, a third sub-surface S14 disposed opposite to the retaining wall 21, a first sub-connecting surface S13 for connecting the first sub-surface S11 and the second sub-surface S12, and a second sub-connecting surface S15 for connecting the second sub-surface S12 and the third sub-connecting surface S14. Wherein, the farthest distance between at least one of the first sub-surface S11 and the third sub-surface S14 to the retaining wall 21 is different from the farthest distance between the second sub-surface S12 to the retaining wall 21. For example: the farthest distances from the first sub-surface S11 and the third sub-surface S14 to the retaining wall 21 are equal, and the farthest distances from the first sub-surface S11 and the third sub-surface S14 to the retaining wall 21 are greater than the farthest distances from the second sub-surface S12 to the retaining wall 21; of course, the farthest distances from the first sub-surface S11 and the third sub-surface S14 to the retaining wall 21 may be different. In addition, at least one of the width of the first sub-surface S11 and the width of the third sub-surface S14 may be smaller than the width of the second sub-surface S12 in the direction away from the optical film 6, in this way, the light rays irradiated to the bearing part 22 and reflected to the human eye can be effectively reduced.

For example: with continued reference to fig. 6, in some embodiments, the first sub-surface S11, the second sub-surface S12, and the third sub-surface S14 are sequentially disposed in a direction away from the optical film 6, and the farthest distance between each of the first sub-surface S11 and the third sub-surface S14 to the retaining wall 21 is greater than the farthest distance between each of the second sub-surface S12 to the retaining wall 21. The first sub-surface S11, the second sub-surface S12, and the third sub-surface S14 may be substantially parallel or parallel to the plane of the retaining wall 21, and both the first sub-connecting surface S13 and the second sub-connecting surface S15 may be substantially parallel or not parallel to the plane of the optical film 6. Of course, the first sub-surface S11, the second sub-surface S12, and the third sub-surface S14 may also have an angle with the plane of the retaining wall 21.

In another example, fig. 7 is a schematic structural diagram of another backlight module and a display panel 10 according to the embodiment of the disclosure; as shown in fig. 7, the bearing portion 22 of the frame 2 includes not only the first surface S1 described above, but also a second surface that is adjacent to the optical film 6 and is disposed opposite to the optical film 6. The extension plane of the second surface of the bearing part 22 and the plane of the optical film 6 have a dihedral angle, which can make the width of the first sub-surface S11 in the direction away from the optical film 6 as small as possible to reduce the light reflected by the first surface S1 to the human eye as small as possible. For example: the dihedral angle α between the extension of the second surface of the carrier 22 and the plane of the optical film 6 is less than 5 °.

In some embodiments, a haze structure is formed on the first surface S1 of the bearing part 22 of the bezel 2, that is, the first surface S1 is roughened, so that specular reflection can be reduced, diffuse reflection can be increased, and light irradiated on the first surface S1 can be consumed, thereby reducing light reflected by the first surface S1 toward the display panel 10.

The matte structure on the first surface S1 may be formed by performing matte treatment on the first surface S1, or may be formed by attaching a matte film layer on the first surface S1.

In some embodiments, the bearing portion 22 and the retaining wall 21 of the rubber frame 2 may be an integrally formed structure. For example: the rubber frame 2 is formed by injection molding.

With continued reference to FIG. 2, in some embodiments, the bottom wall 11 of the backboard 1 is formed with reinforcing ribs the bottom wall 11 of the backboard 1. in some embodiments, the reinforcing ribs on the bottom wall 11 of the backboard 1 are formed by a sheet metal process as a reinforcing rib structure to increase the strength of the backboard 1. In some embodiments, the width of the ribs is 0.2mm to 1.5 mm. For example: the width of the reinforcing ribs is 0.5mm, 0.6mm, 0.8mm, 1.1mm, 1.3mm, etc. Of course, in some products, no reinforcing ribs may be provided. In the embodiment of the present disclosure, the width of the reinforcing rib structure is not specifically limited, and may be specifically set according to the product requirement. With continued reference to FIG. 2, in some embodiments, the optical film 6 includes a diffuser, a prism sheet, or the like.

As shown in fig. 3, 4, 6-7, in some embodiments, the backlight module includes not only the above-mentioned structure but also the outer frame 3; the outer frame 3 is disposed outside the plastic frame 2 and the display panel 10, and is used for fixing the display panel 10 and the plastic frame 2. For example: the outer frame 3 includes a front frame portion 31 on the display surface side of the display panel 10, and a side frame portion 32 provided side by side with the stopper wall 21 of the rubber frame 2. Fig. 8 is a schematic mechanism diagram of another backlight module and a display panel 10 according to an embodiment of the disclosure; as shown in fig. 8, the backlight module may not include the outer frame 3, which may further narrow the display device.

In a second aspect, an embodiment of the disclosure provides a display device, which includes the backlight module and the display panel 10. Wherein, the display panel 10 is arranged on one side of the bearing part 22 of the rubber frame 2, which faces away from the optical film 6. The front frame portion 31 of the outer frame 3 is located on the display surface side of the display panel 10.

In the embodiment of the present disclosure, since the display device adopts the backlight module, at least a part of the position on the first surface S1 of the supporting portion 22 of the plastic frame 2 of the backlight module protrudes to a side close to the retaining wall 21, that is, compared with the related art, at least a part of the position on the first surface S1 can be moved to a plane close to the retaining wall 21, so that the light reflected to human eyes through the first surface S1 can be effectively reduced, and the display image appears dark shadow in the peripheral area Q2 of the display device, thereby improving the display effect of the display device.

The display device may be: the display device comprises any product or component with a display function, such as a liquid crystal panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

Of course, other conventional structures, such as a power supply unit, a display driving unit, and the like, may also be included in the display device of the present embodiment.

It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A backlight module, comprising:

a light guide plate disposed in the accommodating portion;

2. The backlight module according to claim 1, wherein at least a portion of the first surface comprises a first sub-surface and a second sub-surface disposed opposite to the dam wall, and a first sub-connecting surface for connecting the first sub-surface and the second sub-surface;

3. A backlight module according to claim 2, wherein the first sub-surface width is smaller than the width of the second sub-surface in a direction away from the optical film sheet.

4. The backlight module according to claim 2, wherein the farthest distance between the first sub-surface and the retaining wall is greater than the farthest distance between the second sub-surface and the retaining wall.

5. The backlight module as claimed in claim 2, wherein the first sub-surface is substantially parallel to the second sub-surface.

6. The backlight module according to claim 1, wherein at least a portion of the first surface comprises a first sub-surface, a second sub-surface, a third sub-surface disposed opposite to the dam, a first sub-connecting surface for connecting the first sub-surface and the second sub-surface, and a second sub-connecting surface for connecting the second sub-surface and the third sub-surface;

7. The backlight module according to claim 6, wherein a farthest distance between at least one of the first sub-surface and the third sub-surface and the retaining wall is greater than a farthest distance between the second sub-surface and the retaining wall.

8. The backlight module according to claim 6, wherein at least one of the first and third sub-surfaces has a width smaller than a width of the second sub-surface in a direction away from the optical film.

9. The backlight module according to claim 6, wherein the first sub-surface, the second sub-surface and the third sub-surface are substantially parallel.

10. A backlight module according to any one of claims 2-9, wherein the height of the first surface in a direction away from the optical film is not less than 0.8 mm.

11. A backlight module according to any one of claims 2-9, wherein the carrier comprises a second surface disposed opposite to the optical film, and an extension plane of the second surface has a dihedral angle with a plane of the optical film.

12. A backlight module according to claim 11, wherein the dihedral angle is no greater than 5 °.

13. A backlight module according to any one of claims 2-9, comprising a matte structure on the first surface.

14. A backlight module according to any one of claims 2-9, wherein the first surface is circumferentially disposed adjacent to the projection of the dam.

15. A backlight module according to any one of claims 2-9, wherein the first surface is protruded from a side close to the retaining wall around the circumference of the supporting portion.

16. The backlight module according to any of claims 2-9, further comprising a reflective sheet disposed in the accommodating portion and located on a side of the light guide plate facing away from the optical film.

17. A backlight module according to any one of claims 2-9, wherein the bottom wall is formed with ribs; the width of the reinforcing rib is 0.2mm-1.5 mm.

18. The backlight module according to any of claims 2-9, wherein the first surface comprises at least one of a step surface, a groove surface, and a wave surface.

19. A display device, comprising the backlight module of any one of claims 1-18 and a display panel disposed on the carrier.

20. The display device as claimed in claim 19, wherein the display device comprises a display area, and the distance from the retaining wall to the boundary of the display area is not more than 7 mm.