Backlight module and display device

Abstract

The application provides a backlight module and a display device, and belongs to the technical field of display. The backlight module provided by the application comprises a back plate, a light guide plate, an optical film and a glue frame. The back plate comprises a bottom wall and a side wall, the bottom wall and the side wall are connected and define a containing part of the back plate; the light guide plate is arranged in the containing part; the optical film is arranged on a side of the light guide plate away from the bottom wall; the glue frame comprises a retaining wall and a bearing part, the retaining wall is arranged side by side with the side wall and is arranged on a side of the side wall away from the light guide plate; the bearing part is connected with the retaining wall and is located on a side of the side wall and the optical film away from the bottom wall; wherein the bearing part comprises a first surface which is arranged away from the side wall and opposite to the retaining wall, and at least part of positions on the first surface protrude towards a side close to the retaining wall.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of display, and particularly relates to a backlight module and a display device. BACKGROUND

[0002] In the field of liquid crystal display, the main function of the backlight module is to provide a uniform and high-brightness light source for the liquid crystal panel. The basic principle is to convert the commonly used linear or point light source into a high-brightness and uniformly distributed surface light source assembly through an effective light conversion mechanism, so that the liquid crystal panel can display images. As one of the key components of the liquid crystal display device, the light emitting effect of the backlight module will directly affect the visual effect of the liquid crystal display panel. With the development of technology and the increasing demand for appearance of consumers, the traditional backlight module with a front frame and a rear cover has been unable to meet the needs of high-end consumers. In order to meet the higher needs of consumers, narrow-frame and ultra-thin displays have gradually developed. The structure of the backlight module will directly affect the frame width and thickness of the display, therefore, improving the structure of the backlight module is the focus. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art, and provide a backlight module and a display device.

[0004] In a first aspect, the present application provides a backlight module, comprising:

[0005] a back plate comprising a bottom wall and a side wall, the bottom wall and the side wall being connected and defining a receiving portion of the back plate;

[0006] a light guide plate arranged in the receiving portion;

[0007] an optical film arranged on a side of the light guide plate away from the bottom wall;

[0008] a glue frame comprising a retaining wall and a bearing portion, the retaining wall being arranged side by side with the side wall and on a side of the side wall away from the light guide plate; the bearing portion being connected with the retaining wall and located on a side of the side wall and the optical film away from the bottom wall; wherein,

[0009] the bearing portion comprises a first surface arranged away from the side wall and opposite to the retaining wall, and at least part of the first surface protrudes towards the side of the retaining wall.

[0010] The first surface comprises a first sub-surface and a second sub-surface arranged opposite to the retaining wall, and a first sub-connection surface for connecting the first sub-surface and the second sub-surface.

[0011] The first sub-surface and the second sub-surface are sequentially arranged in a direction away from the optical film sheet, and the farthest distance between the first sub-surface and the second sub-surface to the retaining wall is not equal.

[0012] The width of the first sub-surface is less than the width of the second sub-surface in a direction away from the optical film sheet.

[0013] The farthest distance between the first sub-surface to the retaining wall is greater than the farthest distance between the second sub-surface to the retaining wall.

[0014] The first sub-surface and the second sub-surface are substantially parallel.

[0015] The first surface includes a first sub-surface, a second sub-surface, and a third sub-surface arranged opposite to the retaining wall, a first sub-connection surface connecting the first sub-surface and the second sub-surface, and a second sub-connection surface connecting the second sub-surface and the third sub-surface.

[0016] The first sub-surface, the second sub-surface, and the third sub-surface are sequentially arranged in a direction away from the optical film sheet, and the farthest distance between the first sub-surface, the second sub-surface, and the third sub-surface to the retaining wall is not equal.

[0017] The farthest distance between at least one of the first sub-surface and the third sub-surface to the retaining wall is greater than the farthest distance between the second sub-surface to the retaining wall.

[0018] The width of at least one of the first sub-surface and the third sub-surface is less than the width of the second sub-surface in a direction away from the optical film sheet.

[0019] The first sub-surface, the second sub-surface, and the third sub-surface are substantially parallel.

[0020] The height of the first surface in a direction away from the optical film sheet is not less than 0.8 mm.

[0021] The carrier includes a second surface arranged opposite to the optical film sheet, and the second surface has a dihedral angle between the extension surface and the plane where the optical film sheet is located.

[0022] The dihedral angle is not greater than 5°.

[0023] The first surface includes a matte structure.

[0024] The position of the first surface protruding towards the retaining wall surrounds the circumference of the first surface.

[0025] The first surface protrudes towards a side close to the retaining wall.

[0026] The backlight module further comprises a reflective sheet arranged in the accommodating portion and located on a side of the light guide plate away from the optical film.

[0027] The bottom wall is provided with a reinforcing rib, and the width of the reinforcing rib is 0.2-1.5mm.The first surface comprises at least one of a stepped surface, a grooved surface and a wavy surface.

[0028] In a second aspect, the embodiments of the present disclosure provide a display device comprising the backlight module of any one of the above and a display panel arranged on the bearing portion.

[0029] The display device comprises a display area, and the distance from the retaining wall to the boundary of the display area is not greater than 7mm. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 FIG. 1 is a structural schematic diagram of an exemplary display device.

[0031] Figure 2 FIG. 2 is a dark shadow schematic diagram of the display device shown in FIG. 1. Figure 1

[0032] FIG. 3 is a structural schematic diagram of a backlight module and a display panel according to an embodiment of the present disclosure. Figure 3

[0033] FIG. 4 is a schematic diagram of a first surface according to an embodiment of the present disclosure. Figure 4

[0034] FIG. 5 is a corresponding relationship between light exit angle and brightness. Figure 5

[0035] FIG. 6 is a dark shadow schematic diagram of a display device using the backlight module according to an embodiment of the present disclosure. Figure 6

[0036] FIG. 7 is a schematic diagram of another first surface according to an embodiment of the present disclosure. Figure 7

[0037] FIG. 8 is a structural schematic diagram of another backlight module and display panel according to an embodiment of the present disclosure. Figure 8

[0038] FIG. 9 is a structural schematic diagram of another backlight module and display panel according to an embodiment of the present disclosure. Figure 9 DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those ordinarily skilled in the art without creative work fall into the scope of protection of the present application.

[0040] The shapes and sizes of the components in the drawings do not reflect true proportions, and the purpose is only to facilitate the understanding of the contents of the embodiments of the present application.

[0041] Unless otherwise defined, technical terms or scientific terms used in the present disclosure should be understood as the common meanings to those skilled in the art of the present disclosure. The terms "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are used to distinguish different components. Similarly, the terms "one", "a" or "the" and similar terms do not denote quantity limitation, but denote the existence of at least one. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0042] Figure 1 Structure diagram of an exemplary display device; as Figure 1As shown, the display device is divided into a display area Q1 and a peripheral area Q2 surrounding the display area Q1; the display device includes a backlight module and a display panel 10 located at the light emitting surface of the backlight module. The display panel 10 can include oppositely arranged first and second substrates and a liquid crystal layer formed between the first and second substrates. The first substrate includes but is not limited to an array substrate, and the second substrate includes but is not limited to a color filter substrate. The backlight module includes a back plate 1, a rubber frame 2, an outer frame 3, a light guide plate 5, a light source assembly, an optical film 6, a reflective sheet 4, etc. 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 receiving portion, the reflective sheet 4, the light guide plate 5 and the optical film 6 are arranged in the receiving portion and are arranged in sequence in a direction away from the bottom wall 11. The light source assembly can be an LED light bar, which is arranged on the side wall 12 of the backlight and opposite to at least one side of the light guide plate 5. The rubber frame 2 includes a barrier wall 21 and a bearing portion 22; the barrier wall 21 is arranged side by side with the side wall 12 of the back plate 1, the bearing portion 22 is connected with the barrier wall 21 and is located at the side wall 12 of the back plate 1 and the side of the optical film 6 away from the bottom wall 11 of the back plate 1; the bearing portion 22 of the rubber frame 2 is used to bear the display panel 10. The outer frame 3 is arranged outside the rubber frame 2 and the display panel 10 to fix the rubber frame 2 and the display panel 10.

[0043] The inventors found that as the display device is becoming narrower, the distance between the outer edge of the rubber frame 2 and the display area Q1 of the display device is becoming smaller. In this case, part of the light emitted by the light guide plate 5 will enter the human eye after being irradiated to the first surface S1 of the bearing portion 22, and at the same time, a dark shadow will be formed at the edge of the display picture. In severe cases, part of the pixels in the display area Q1 of the display panel 10 will be blocked, thereby affecting the display of the display device. Figure 2 For Figure 1 The display device shown in the dark shadow schematic diagram; by Figure 2 It can be seen that in the display device in the related art, a dark shadow will appear at the edge of the display area after the light is irradiated to the first surface S1 of the bearing portion 22. It should be noted that Figure 2 The dark shadow appearing on the printed circuit board side of the display device is schematically shown, and the same problem can also occur on the other side of the display panel.

[0044] In order to solve the above problems, the following technical solutions are provided in the embodiments of the present disclosure.

[0045] In a first aspect, Figure 3 A structural schematic diagram of a backlight module display panel 10 according to an embodiment of the present disclosure; as Figure 3As shown, the backlight module provided by the embodiment of the present disclosure forms a display device in cooperation with a display panel 10. The backlight module can include a back plate 1, a glue frame 2, a reflective sheet 4, a light guide plate 5, an optical film 6, an LED light bar, and the like. The back plate 1 includes a bottom wall 11 and a side wall 12. The bottom wall 11 of the back plate 1 is arranged opposite to the display panel 10, the side wall 12 extends towards the display panel 10, is connected with the bottom wall 11, and defines a containing portion. The reflective sheet 4, the light guide plate 5, and the optical film 6 are arranged in the containing portion and are sequentially arranged in a direction away from the bottom wall 11. The glue frame 2 includes a blocking wall 21 and a bearing portion 22. The blocking wall 21 is arranged side by side with the side wall 12 of the back plate 1, the bearing portion 22 is connected with the blocking wall 21, and is located on a side of the side wall 12 of the back plate 1 and the optical film 6 away from the bottom wall 11. The bearing portion 22 includes a first surface S1 opposite to the blocking wall 21 and away from the side wall 12 of the back plate 1. In particular, at least part of the positions on the first surface S1 of the bearing portion 22 in the embodiment of the present disclosure protrude towards the side close to the blocking wall 21 (hereinafter referred to as concave position).

[0046] In the embodiment of the present disclosure, since at least part of the positions on the first surface S1 of the bearing portion 22 of the glue frame 2 of the backlight module protrude towards the side close to the blocking wall 21, that is, at least part of the positions on the first surface S1 are moved towards the plane where the blocking wall 21 is located compared with the related art, the optical path of the light rays irradiated to the concave position on the first surface S1 is lengthened, at this time, the intensity of the light rays is weakened, and the light rays reflected to the human eye are also reduced, thus, the problem of dark shadow can also be effectively alleviated.

[0047] Reference Figure 3 As shown, in some embodiments, the maximum distance between the first surface S1 of the bearing portion 22 and the blocking wall 21 is not greater than 7 mm, that is, the maximum width of the glue frame 2 is not greater than 7 mm, thus the backlight module of the embodiment of the present disclosure helps to realize narrow frame. For example, in some products, the maximum distance between the first surface S1 of the bearing portion 22 and the blocking wall 21 is about 6 mm; in addition, in some products, the maximum distance between the first surface S1 of the bearing portion 22 and the blocking wall 21 is not greater than 5 mm. In the embodiment of the present disclosure, the maximum distance between the first surface S1 of the bearing portion 22 and the blocking wall 21 can be set to about 1.0-1.2 mm, so as to realize narrow frame design as much as possible.

[0048] In some embodiments, the first surface S1 has a protruding position towards the side close to the barrier wall 21 in the circumferential direction, i.e., the first surface S1 includes a circumferential concave surface protruding towards the side close to the barrier wall 21. In this way, the light reflected to the human eye from the light irradiated to the first surface S1 can be reduced as much as possible, effectively alleviating the dark shadow of the display picture in the peripheral area Q2 of the display device. The following is described by taking the first surface S1 including a circumferential concave surface protruding towards the side close to the barrier wall 21 as an example.

[0049] In one example, Figure 4 is a schematic diagram of a first surface S1 of an embodiment of the present disclosure; as Figure 3 and 4 , the first surface S1 of the bearing part 22 of the glue frame 2 is in the form of a step along the cross section perpendicular to the plane of the optical film 6. The following is described by taking the first surface S1 of the bearing part 22 in the form of a first-order step along the cross section perpendicular to the plane of the optical film 6 as an example. Specifically, the first surface S1 of the bearing part 22 includes a first sub-surface S11 and a second sub-surface S12 arranged opposite to the barrier wall 21, and a first sub-connection surface S13 for connecting the first sub-surface S11 and the second sub-surface S12. The maximum distance between the first sub-surface S11 and the second sub-surface S12 to the barrier wall 21 is not equal. Continue to refer to Figure 2 , the maximum distance between the first sub-surface S11 to the barrier wall 21 is greater than the maximum distance between the second sub-surface S12 to the barrier wall 21. Most of the light emitted through the optical film 6 is irradiated onto the second sub-surface S12, and a small part is irradiated onto the first sub-surface S11. Since the distance between the second sub-surface S12 and the barrier wall 21 is shortened compared with the conventional design, the optical path of the light irradiated onto the second sub-surface S12 is lengthened, and the light intensity is weakened compared with the light irradiated onto the first sub-surface S11. Among the light irradiated onto the second sub-surface S12, the light with a small angle of emission through the optical film 6 is reflected to the peripheral area through the second sub-surface S12 and is absorbed by the black matrix of the peripheral area; the light with a large angle of emission through the optical film 6 has a relatively low brightness (for example, the corresponding relationship between the angle of emission and the brightness of the light is shown in Figure 5 ), the optical path of the light irradiated onto the second sub-surface S12 is lengthened, the light intensity is further weakened, and the brightness is lower and less likely to be perceived by the human eye. Thus, the number and intensity of the light reflected to the human eye from the light irradiated to the bearing part 22 can be effectively reduced, achieving the purpose of eliminating and alleviating the dark shadow. In addition, as shown in Figure 4 , in the direction away from the optical film 6, the width W1 of the first sub-surface S11 can be smaller than the width W2 of the second sub-surface S12. In this way, the light reflected to the human eye from the light irradiated to the bearing part 22 can also be effectively reduced. Figure 6 is a schematic diagram of a dark shadow of a display device using a backlight module of an embodiment of the present disclosure. As Figure 6 can be seen, the dark shadow is significantly weakened.

[0050] For example, in some embodiments, the width W1 of the first sub-surface S11 in the direction away from the optical film 6 (hereinafter referred to as the width) is not less than 0.8 mm. The maximum width W of the first surface S1 of the supporting portion 22 is 2.1 mm, the width W1 of the first sub-surface S11 is 0.9 mm, 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 2.3 mm, the width W1 of the first sub-surface S11 is 1.1 mm, and the width W2 of the second sub-surface S12 is 1.2 mm. The inventors verified these two sets of data and found that the edge shadow problem of the display panel 10 was significantly improved.

[0051] For example: Continue to refer to Figure 3 In some embodiments, the first sub-surface S11 and the second sub-surface S12 are sequentially arranged in a direction away from the optical film 6, and the maximum distance between the first sub-surface S11 and the retaining wall 21 is greater than the maximum distance between the second sub-surface S12 and the retaining wall 21. The first sub-surface S11 and the second sub-surface S12 can be approximately parallel or parallel to the plane of the retaining wall 21. In this case, the first sub-connecting surface S13 is parallel or approximately parallel to the plane of the optical film 6. Of course, the first sub-surface S11 and the second sub-surface S12 can also form a certain angle with the plane of the retaining wall 21.

[0052] In another example, Figure 6 is a schematic diagram of another first surface S1 according to an embodiment of the present disclosure; Figure 5 As shown, the first surface S1 of the supporting portion 22 of the plastic frame 2 is groove-shaped along a cross-section perpendicular to the plane where the optical film 6 is located. Specifically, the first surface S1 of the supporting portion 22 includes a first sub-surface S11, a second sub-surface S12, and a third sub-surface S14, which are arranged opposite the retaining wall 21. A first sub-connecting surface S13 is used to connect the first sub-surface S11 and the second sub-surface S12, and a second sub-connecting surface S15 is used to connect the second sub-surface S12 and the third sub-connecting surface S14. The maximum distance between at least one of the first sub-surface S11 and the third sub-surface S14 and the retaining wall 21 is different from the maximum distance between the second sub-surface S12 and the retaining wall 21. For example, the maximum distances from the first sub-surface S11 and the third sub-surface S14 to the barrier wall 21 are equal, and the maximum distances from both to the barrier wall 21 are greater than the maximum distance from the second sub-surface S12 to the barrier wall 21. Of course, the maximum distances from the first sub-surface S11 and the third sub-surface S14 to the barrier wall 21 may also be different. Furthermore, in a direction away from the optical film 6, at least one of the widths of the first sub-surface S11 and the third sub-surface S14 may be smaller than the width of the second sub-surface S12. This approach can also effectively reduce the amount of light that strikes the carrier portion 22 and is reflected to the human eye.

[0053] For example, continuing to refer to Figure 6 In some embodiments, the first sub-surface S11, the second sub-surface S12, and the third sub-surface S14 are sequentially arranged in a direction away from the optical film 6, and the farthest distance between the first sub-surface S11 and the baffle wall 21 and the farthest distance between the third sub-surface S14 and the baffle wall 21 are both greater than the farthest distance between the second sub-surface S12 and the baffle wall 21. At this time, the first sub-surface S11, the second sub-surface S12, and the third sub-surface S14 can be substantially parallel or parallel to the plane where the baffle wall 21 is located, and the first sub-connection surface S13 and the second sub-connection surface S15 are both parallel or substantially parallel to the plane where the optical film 6 is located. Of course, the first sub-surface S11, the second sub-surface S12, and the third sub-surface S14 can also have a certain angle with the plane where the baffle wall 21 is located.

[0054] In another example, Figure 7 FIG. 2 is a structural schematic diagram of another backlight module and display panel 10 according to an embodiment of the present disclosure; as Figure 7 As shown, the bearing part 22 of the glue frame 2 not only includes the first surface S1 described above, but also includes a second surface close to the optical film 6 and arranged opposite to the optical film 6. The extension surface of the second surface of the bearing part 22 has a dihedral angle with the plane where the optical film 6 is located. The dihedral angle can make the width of the first sub-surface S11 in the direction away from the optical film 6 as small as possible, so as to reduce the light reflected to the human eye by the first surface S1. For example, the dihedral angle a between the extension surface of the second surface of the bearing part 22 and the plane where the optical film 6 is located is less than 5°.

[0055] In some embodiments, a frosting structure is formed on the first surface S1 of the bearing part 22 of the glue frame 2, that is, the first surface S1 is roughened, so as to reduce the specular reflection and increase the diffuse reflection, thereby consuming the light irradiated on the first surface S1 and reducing the light reflected to the display panel 10 by the first surface S1.

[0056] The frosting structure on the first surface S1 can be formed by frosting treatment on the first surface S1, or the frosting structure can be formed by attaching a frosting film layer on the first surface S1.

[0057] In some embodiments, the bearing part 22 of the glue frame 2 and the baffle wall 21 can be an integrally formed structure. For example, the glue frame 2 is formed by injection molding.

[0058] Continuing to refer to Figure 2In some embodiments, the bottom wall 11 of the back panel 1 is formed with reinforcing ribs. In some embodiments, the reinforcing ribs on the bottom wall 11 of the back panel 1 are formed by sheet metal processing as a reinforcing rib structure to increase the strength of the back panel 1. In some embodiments, the width of the reinforcing rib is 0.2mm-1.5mm. For example: the width of the reinforcing rib is 0.5mm, 0.6mm, 0.8mm, 1.1mm, 1.3mm, etc. Of course, reinforcing ribs may not be provided in some products. In the embodiments of the present disclosure, there is no specific limitation on the width of the reinforcing rib structure, and it can be specifically set according to product requirements. Continue to refer to Figure 2 In some embodiments, the optical film 6 includes a diffuser, a prism, and other structures.

[0059] like Figure 3 、 4 As shown in Figures 6-7, in some embodiments, the backlight module includes not only the above structure but also an outer frame 3; the outer frame 3 is disposed outside the plastic frame 2 and the display panel 10 and is used to secure the display panel 10 to the plastic frame 2. For example, the outer frame 3 includes a front frame portion 31 located on the display surface side of the display panel 10, and a side frame portion 32 disposed side by side with the retaining wall 21 of the plastic frame 2. Figure 8 FIG. 1 is a schematic diagram of another backlight module and display panel 10 according to an embodiment of the present disclosure; FIG. Figure 8 As shown, the backlight module may not include the outer frame 3, which can further enable the display device to have a narrow edge.

[0060] In a second aspect, embodiments of the present disclosure provide a display device comprising the aforementioned backlight module and a display panel 10. The display panel 10 is disposed on the side of the supporting portion 22 of the plastic frame 2 facing 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.

[0061] In the embodiment of the present disclosure, since the display device adopts the above-mentioned backlight module, at least a portion of the first surface S1 of the supporting portion 22 of the plastic frame 2 of the backlight module protrudes toward the side close to the retaining wall 21. That is to say, compared with the related art, at least a portion of the first surface S1 can be moved toward the plane close to the retaining wall 21. In this way, the light reflected to the human eye through the first surface S1 can be effectively reduced, so that the display screen will have a dark shadow in the peripheral area Q2 of the display device, thereby improving the display effect of the display device.

[0062] The display device can be any product or component with a display function, such as a liquid crystal panel, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, or a navigator.

[0063] Of course, the display device of the present embodiment can also include other conventional structures, such as a power supply unit, a display driving unit, and the like.

[0064] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and principle of the present application, and these modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A display device comprising a backlight module and a display panel: The backlight module includes: A back plate, comprising a bottom wall and side walls, wherein the bottom wall and the side walls are connected and define a receiving portion of the back plate; a light guide plate, disposed in the accommodating portion; an optical film, arranged on a side of the light guide plate away from the bottom wall; The plastic frame includes a retaining wall and a bearing portion, wherein the retaining wall is arranged side by side with the side wall and is arranged on the side of the side wall away from the light guide plate; the bearing portion is connected to the retaining wall and is located on the side of the side wall and the optical film away from the bottom wall; wherein, The bearing portion includes a first surface facing away from the side wall and arranged opposite to the retaining wall, and at least a portion of the first surface protrudes toward a side close to the retaining wall; At least a portion of the first surface includes a first sub-surface and a second sub-surface disposed opposite 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 disposed sequentially in a direction away from the optical film, and the maximum distances between the first sub-surface and the second sub-surface and the retaining wall are different; and the width of the first sub-surface in a direction away from the optical film is not less than 0.8 mm; The maximum width of the first surface of the carrying portion is 2.3 mm; the carrying portion further includes a top surface, and the display panel is disposed on the top surface of the carrying portion.

2. The display device according to claim 1, wherein Along a direction away from the optical film, a width of the first sub-surface is smaller than a width of the second sub-surface.

3. The display device according to claim 1, 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.

4. The display device according to claim 1, wherein The first sub-surface is substantially parallel to the second sub-surface.

5. The display device according to claim 1, wherein At least part of the first surface further includes a third sub-surface arranged opposite to the retaining wall, and a second sub-connecting surface for connecting the second sub-surface and the third sub-surface; The first sub-surface, the second sub-surface, and the third sub-surface are sequentially arranged in a direction away from the optical film, and the maximum distances between the first sub-surface, the second sub-surface, and the third sub-surface and the retaining wall are different. The display device according to claim 5 , 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.

7. The display device according to claim 5, wherein: In a direction away from the optical film, a width of at least one of the first sub-surface and the third sub-surface is smaller than a width of the second sub-surface.

8. The display device according to claim 5, wherein The first sub-surface, the second sub-surface, and the third sub-surface are substantially parallel.

9. The display device according to claim 2, wherein: The height of the first surface in a direction away from the optical film is not less than 0.8 mm.

10. The display device according to any one of claims 1 to 9, wherein: The carrying portion includes a second surface disposed opposite to the optical film, and a dihedral angle is formed between an extended surface of the second surface and a plane where the optical film is located.

11. The display device according to claim 10, wherein: The dihedral angle is no greater than 5°.

12. The display device according to any one of claims 1 to 9, wherein: The first surface includes a matte structure.

13. The display device according to any one of claims 1 to 9, wherein: The first surface is located upwardly close to the concave position of the retaining wall and surrounds the circumference of the first surface.

14. The display device according to any one of claims 1 to 9, wherein: The concave position on the first surface toward the side close to the retaining wall surrounds the circumference of the bearing portion.

15. The display device according to any one of claims 1 to 9, wherein: The backlight module further includes a reflective sheet, which is disposed in the accommodating portion and located on a side of the light guide plate away from the optical film.

16. The display device according to any one of claims 1 to 9, wherein: A reinforcing rib is formed on the bottom wall; the width of the reinforcing rib is 0.2mm-1.5mm.

17. The display device according to any one of claims 1 to 9, wherein: The first surface includes at least one of a step surface, a groove surface, and a wave surface.

18. The display device according to any one of claims 1 to 9, wherein: The display device includes a display area, and the distance from the retaining wall to the boundary of the display area is no more than 7 mm.

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