Backlight module and display device

Abstract

The invention provides a backlight module and a display device, the backlight module comprises a back plate, a plurality of light-emitting elements, a light guide plate, at least one optical film material, a limiting structure and at least one shading bonding element, the back plate is provided with a bottom plate and a plurality of side walls which are connected with each other, the bottom plate and the plurality of side walls define a containing space, and the plurality of side walls comprise a first side wall; the plurality of light-emitting elements are arranged on the first side wall; the light guide plate is arranged in the accommodating space; the at least one optical film material is arranged on the light guide plate, and each optical film material is provided with a limiting part; the limiting structure protrudes from the first surface of the light guide plate and is adjacent to the edge, facing the first side wall, of the light guide plate, the first surface deviates from the bottom plate, and the limiting structure is used for being matched with the limiting parts to limit at least one optical film material; the at least one shading bonding element is correspondingly stacked between the optical film materials; wherein each shading bonding element is adjacent to and surrounds the limiting structure so as to shade light rays emitted to the limiting structure by the plurality of light-emitting elements.

Description

Technical Field

[0001] The invention relates to a backlight module and a display device using the backlight module. Background Art

[0002] With the development of science and technology, display devices are widely used in many electronic products, such as mobile phones, tablet computers, cars, etc. For car-mounted display devices, the size is getting bigger and bigger, especially the length is getting longer and longer, and the length of the backlight module used is also the same. When assembling the backlight module, the optical film material is prone to rotation, and the gap between its four sides and the frame deviates from the preset value, resulting in the edge of the optical film material being too close to the display area and local light leakage, or the edge of the optical film material being too close to the frame and prone to bending under high temperature conditions, resulting in uneven light. In order to avoid the aforementioned phenomenon, a limiting structure is usually set on the light guide plate of the side-entry backlight module to limit the optical film material stacked on the light guide plate to avoid problems such as light leakage caused by rotation / displacement of the optical film material. However, the light-emitting unit will inject light into the limiting structure, causing light leakage here. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a backlight module, comprising:

[0004] A back plate having a bottom plate and a plurality of side walls connected to each other, wherein the bottom plate and the plurality of side walls enclose a receiving space, and the plurality of side walls include a first side wall;

[0005] a plurality of light-emitting elements, disposed on the first side wall;

[0006] a light guide plate, disposed in the accommodating space;

[0007] At least one optical film material is disposed on the light guide plate, and each optical film material has a limiting portion;

[0008] a limiting structure protruding from the first surface of the light guide plate and adjacent to the edge of the light guide plate facing the first side wall, the first surface facing away from the bottom plate, the limiting structure being used to cooperate with each limiting portion to limit the at least one optical film material; and

[0009] At least one light-shielding adhesive element is stacked and disposed between each optical film material; wherein,

[0010] Each light-shielding adhesive element is adjacent to and surrounds the limiting structure to shield the light emitted from the plurality of light-emitting elements toward the limiting structure.

[0011] In one embodiment of the above backlight module, each light-shielding adhesive element is flatly laid and adhered to the surface of the corresponding optical film material, and along the thickness direction of the backlight module, each light-shielding adhesive element surrounds the limiting structure respectively.

[0012] In one embodiment of the above backlight module, in the thickness direction, each light-shielding adhesive element is respectively laid flat and adhered between two adjacent layers of optical film materials and between the light guide plate and the adjacent optical film materials.

[0013] In one embodiment of the above-mentioned backlight module, the backlight module further has a middle frame connected to the multiple side walls, and the first vertical projection of each light-shielding adhesive element on the bottom plate does not exceed the second vertical projection of the middle frame on the bottom plate.

[0014] In one embodiment of the above-mentioned backlight module, each light-shielding adhesive element surrounds the limiting structure and is in a U-shaped structure or a X-shaped structure.

[0015] In one embodiment of the above-mentioned backlight module, each light-shielding adhesive element includes a first light-shielding portion, a second light-shielding portion and a third light-shielding portion that are connected to each other. In the first direction, the first light-shielding portion is adjacent to and surrounds the first side of the limiting structure. In the second direction, the second light-shielding portion and the third light-shielding portion are adjacent to and surround the opposite second side and third side of the limiting structure respectively. The first side is connected between the second side and the third side. The second direction is parallel to the extension direction of the first side wall, and the first direction is perpendicular to the second direction. wherein, in the first direction, the ratio of the width of the first light-shielding portion to the width of the limiting structure is between 1 and 2.

[0016] In an embodiment of the above backlight module, the limiting structure has a limiting thickness in the thickness direction and a limiting width in the first direction, and a ratio of the limiting width to the limiting thickness is between 1 and 2.5.

[0017] In an embodiment of the above-mentioned backlight module, the limiting structure has a limiting length in the second direction, and a ratio of the limiting length to the limiting thickness is between 1 and 2.

[0018] In one embodiment of the above-mentioned backlight module, each light-shielding adhesive element further includes a fourth light-shielding portion. In the first direction, the fourth light-shielding portion is adjacent to and surrounds the fourth side of the limiting structure. The fourth side is opposite to the first side, and the fourth side is connected between the second side and the third side. In the first direction, the width of the fourth light-shielding portion is not greater than the width of the first light-shielding portion.

[0019] In one embodiment of the above-mentioned backlight module, each optical film material has a matching shape corresponding to each light-shielding adhesive element. In the first direction, the edge of each optical film material and each light-shielding adhesive element adjacent to the first side wall does not exceed the edge of the light guide plate, or the edge of each light-shielding adhesive element adjacent to the first side wall exceeds the edge of the corresponding optical film material.

[0020] In one embodiment of the above-mentioned backlight module, the light-shielding adhesive element is an integrated structure.

[0021] The present invention further provides a display device comprising a display panel and the aforementioned backlight module.

[0022] Compared with the prior art, the present invention discloses a backlight module and a display device, in which light-shielding adhesive elements are stacked correspondingly on each optical film material, and each light-shielding adhesive element is adjacent to and surrounds a limiting structure to block light from multiple light-emitting elements toward the limiting structure, thereby avoiding the light leakage problem at the limiting structure.

[0023] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and illustration and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A partial cross-sectional diagram of a backlight module in one embodiment of the present invention is shown.

[0025] Figure 2 A top view of a backlight module according to an embodiment of the present invention is shown.

[0026] Figure 3 FIG. 1 is a partial cross-sectional diagram of a backlight module according to another embodiment of the present invention.

[0027] Figure 4 A top view of a backlight module in another embodiment of the present invention is shown.

[0028] Figure 5 FIG. 1 is a partial cross-sectional diagram of a backlight module in another embodiment of the present invention.

[0029] Figure 6 A schematic diagram of a display device according to an embodiment of the present invention is shown.

[0030] Wherein, the reference numerals:

[0031] 1…Backplane

[0032] 11…First side wall

[0033] 12…base plate

[0034] 2…Light-emitting element

[0035] 3…Light guide plate

[0036] 31…First surface

[0037] 4…Optical film

[0038] 41…Limiting part

[0039] 5…Limiting structure

[0040] 51…first side

[0041] 52…side 2

[0042] 53…third side

[0043] 54…Fourth side

[0044] 6…Light-shielding adhesive components

[0045] 61…first light shielding portion

[0046] 62…Second light shielding portion

[0047] 63…third light shielding portion

[0048] 7…Light

[0049] 8…Middle frame

[0050] d1…first direction

[0051] d2…second direction

[0052] d3…thickness direction

[0053] 100…backlight module

[0054] 200…Display panel

[0055] 1000…Display device DETAILED DESCRIPTION

[0056] The following describes the embodiments of the present invention using specific embodiments and accompanying drawings. Those skilled in the art will appreciate the advantages and effects of the present invention from the disclosure herein. However, the following disclosure is not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, those skilled in the art may implement the present invention in other embodiments based on different viewpoints and applications.

[0057] For the sake of clarity, the figures of the present invention are simplified schematic diagrams illustrating the basic structure of the present invention. Therefore, the structures shown in the figures of the present invention are not drawn to scale with the shapes and dimensions of actual implementations. For example, the dimensions of certain components are exaggerated for ease of illustration.

[0058] Furthermore, it should be understood that when a component, such as a layer, film, region, or substrate, is referred to as being "on" or "connected to" another component, it can be directly on or connected to the other component, or intervening components may be present. In contrast, when a component is referred to as being "directly on" or "directly connected to" another component, there are no intervening components present. As used herein, "connected" can refer to physical and / or electrical connections. Furthermore, "electrically connected" or "coupled" can mean the presence of other components between two components.

[0059] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as understood by one of ordinary skill in the art to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present invention, and will not be interpreted as idealized or overly formal unless explicitly defined as such herein.

[0060] Furthermore, it should be understood that although the terms "first," "second," "third," etc., may be used herein to describe various components, parts, regions, layers, and / or portions, these components, parts, regions, and / or portions should not be limited by these terms. These terms are merely used to distinguish one component, part, region, layer, or portion from another component, part, region, layer, or portion. Thus, a "first component," "part," "region," "layer," or "portion" discussed below could be referred to as a second component, part, region, layer, or portion without departing from the teachings herein.

[0061] It should be understood that references in the specification to "one embodiment," "an embodiment," "an example embodiment," etc., mean that the described embodiment may include certain features, structures, or characteristics, but does not necessarily include those certain features, structures, or characteristics. Furthermore, such references do not necessarily refer to the same embodiment. Furthermore, when specific features, structures, or characteristics are described in conjunction with an embodiment, whether or not explicitly described, it is understood that incorporating such features, structures, or characteristics into other embodiments is within the knowledge of those skilled in the art.

[0062] Certain words are used in the specification and subsequent claims to refer to specific modules, components or parts. It should be understood by those of ordinary skill in the art that technical users or manufacturers may refer to the same module, component or part with different nouns or terms. This specification and the subsequent claims do not use differences in names as a way to distinguish modules, components or parts, but rather use differences in the functions of modules, components or parts as the criteria for distinction. The words "including" and "comprising" mentioned throughout the specification and subsequent claims are open-ended terms and should be interpreted as "including but not limited to". In addition, the word "connect" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connection through other devices.

[0063] Additionally, in the following description and claims, reference will be made to a number of terms, which shall be defined as having the following meanings. The singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. "Optional" or "optionally" means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where the event occurs and instances where it does not.

[0064] When a limiting structure is set on the light guide plate of the edge-lit backlight module to limit the position of the optical film material stacked on the light guide plate, the light-emitting unit will emit light into the limiting structure, causing light leakage here. To solve this problem, please refer to Figures 1 to 2 , Figure 1 A partial cross-sectional diagram of a backlight module in one embodiment of the present invention is shown. Figure 2 The present invention provides a backlight module 100 comprising a back plate 1 , a plurality of light emitting elements 2 , a light guide plate 3 , at least one optical film 4 , a limiting structure 5 , and at least one light shielding adhesive element 6 . The back panel 1 has a connected bottom panel 12 and multiple side walls, and the bottom panel 12 and the multiple side walls are arranged to form a accommodating space, and the multiple side walls include a first side wall 11; multiple light-emitting elements 2 are arranged on the first side wall 11; the light guide plate 3 is arranged in the accommodating space; at least one optical film material 4 is arranged on the light guide plate 3, and each optical film material 4 has a limiting portion 41; the limiting structure 5 protrudes from the first surface 31 of the light guide plate 3 and is adjacent to the edge of the light guide plate 3 facing the first side wall 11, and the first surface 31 is away from the bottom panel 12, and the limiting structure 5 is used to cooperate with each limiting portion 41 to limit the at least one optical film material 4; at least one light-shielding adhesive element 6 is correspondingly stacked between each optical film material 4; wherein, each light-shielding adhesive element 6 is adjacent to and surrounds the limiting structure 5 to block the light 7 emitted from the multiple light-emitting elements 2 toward the limiting structure 5.

[0065] In one embodiment, if Figure 1As shown in the figure, schematically, the light 7 emitted by the light-emitting element 2 toward the limiting structure 5 is gradually absorbed by the multi-layer light-shielding adhesive element 6. Even if some light is emitted from the limiting structure 5 (toward the center of the optical film 4), since the light-shielding adhesive element 6 is arranged to surround the limiting structure 5, the light-shielding adhesive element 6 located around the limiting structure 5 can absorb the aforementioned light, thereby avoiding the problem of light leakage at the limiting structure 5. Similarly, schematically, the light 7 emitted by the light-emitting element 2 toward the incident surface (and other parts) of the light guide plate 3 is normally guided by the light guide plate and emitted from the first surface 31 toward each optical film 4, and then emitted through the top surface of each optical film 4 to provide backlight.

[0066] In one embodiment, each light-shielding adhesive element 6 is flatly laid and adhered to the surface of the corresponding optical film 4, and along the thickness direction d3 of the backlight module 100, each light-shielding adhesive element 6 surrounds the limiting structure 5. In this manner, the multiple layers of light-shielding adhesive elements 6 arranged in the thickness direction d3 surround the limiting structure 5, and can absorb light 7 reflected / refracted from the limiting structure 5 from all angles and from bottom to top, thereby preventing light leakage from the limiting structure 5. Furthermore, while each optical film 4 is being restrained by the limiting structure 5, each light-shielding adhesive element 6 is flatly laid and adhered to the surface of the corresponding optical film 4 to secure the position of each optical film 4, ensuring that the optical film 4 does not rotate / displace, thereby preventing problems such as shaking, loosening, and abnormal noise, thereby ensuring the backlight effect of the backlight module 100.

[0067] See also Figure 3 , Figure 3 A front view of a backlight module in another embodiment of the present invention is shown. Figure 3 and Figure 1 The difference between the embodiment is that a light-shielding adhesive element 6 is laid flat between the light guide plate 3 and the adjacent optical film material 4, and Figure 3 The light 7 emitted by the light-emitting element 2 and its propagation path are omitted. In one embodiment, along the thickness direction d3, each light-shielding adhesive element 6 is flatly laid and bonded between two adjacent layers of optical film 4, as well as between the light guide plate 3 and its adjacent optical film 4. With this arrangement, along the thickness direction of the backlight module 100, each layer of light-shielding adhesive element 6 can absorb light incident on the limiting structure 5 and light emitted from the side surfaces of the limiting structure 5, thereby improving the light-shielding effect on the limiting structure 5.

[0068] Please refer to Figure 1 and Figure 3In one embodiment, the backlight module 100 further includes a middle frame 8 connected to the plurality of side walls. Each side wall may be stepped and have a middle frame support surface. The middle frame 8 may be adhered to the middle frame support surface by an adhesive layer or the like. Furthermore, the middle frame 8 corresponding to the first side wall 11 may be further supported on the top surface of the retaining structure 5. The first vertical projection of each light-shielding adhesive element 6 on the bottom plate 12 does not exceed the second vertical projection of the middle frame 8 on the bottom plate 12. This prevents the light-shielding adhesive element 6 from being too close to the center of the optical film 4, thereby causing a dark display near the retaining structure 5. When the backlight module 1000 is applied to a display device 1000 (described later), the second vertical projection of the middle frame 8 on the bottom plate 12 does not overlap with the display area (not shown) of the display device 1000. Therefore, the light-shielding adhesive elements 6 and the middle frame 8 do not enter the display area of ​​the display device 1000.

[0069] See also Figures 1 to 4 , Figure 4 A top view of a backlight module in another embodiment of the present invention is shown. Figure 2 and Figure 4 Two limiting structures 5 are shown in the figure, but this is not limited to the figure. Moreover, the shading adhesive element 6 is not shown around one of the limiting structures 5. This is only for the convenience of showing the specific structure of the limiting portion 41 of the optical film 4 and the limiting structure 5. In actual application, the shading adhesive element 6 should be set around the limiting structure 5. In one embodiment, each shading adhesive element 6 surrounds the limiting structure 5 and is in a U-shaped structure or a F-shaped structure. For example, when the side wall of the limiting structure 5 is flush with the corresponding side wall (i.e., the light incident surface) of the light guide plate 3 in the first direction d1, each shading adhesive element 6 surrounds the limiting structure 5 and is in a F-shaped structure. When the side wall of the limiting structure 5 does not reach the corresponding side wall (i.e., the light incident surface) of the light guide plate 3 in the second direction d2, each shading adhesive element 6 surrounds the limiting structure 5 and is in a U-shaped structure. Thus, the shading adhesive element 6 can surround the limiting structure 5 according to the different positions of the limiting structure 5 on the light guide plate 3.

[0070] In one embodiment, each shading adhesive element 6 includes a first shading portion 61, a second shading portion 62 and a third shading portion 63 connected to each other. In the first direction d1, the first shading portion 61 is adjacent to and surrounds the first side 51 of the limiting structure 5. In the second direction d2, the second shading portion 62 and the third shading portion 63 are adjacent to and surround the opposite second side 52 and third side 53 of the limiting structure 5 respectively. The first side 51 is connected between the second side 52 and the third side 53. The second direction d2 is parallel to the extension direction of the first side wall 11, and the first direction d1 is perpendicular to the second direction d2. wherein, in the first direction d1, the width of the first shading portion 61 is in a ratio to the width of the limiting structure 5 between 1 and 2.

[0071] In one embodiment, when each light-shielding adhesive element 6 surrounds the retaining structure 5 and forms an "X" shape, the width of the first light-shielding portion 61 in the first direction d1 is greater than the width of the retaining structure 5. Each first light-shielding portion 61 of each light-shielding adhesive element 6 can block / absorb light emitted from the first side 51 of the retaining structure 5 from different positions along the thickness direction d3. Furthermore, each second light-shielding portion 62 can also assist in blocking / absorbing light incident on the retaining structure 5 and emitted from the second side 52 of the retaining structure 5. Each third light-shielding portion 63 can also assist in blocking / absorbing light incident on the retaining structure 5 and emitted from the third side 53 of the retaining structure 5.

[0072] In one embodiment, the limiting structure 5 has a limiting thickness in the thickness direction d3 and a limiting width in the first direction d1. The ratio of the limiting width to the limiting thickness is between 1 and 2.5. By setting the ratio of the limiting width to the limiting thickness, the limiting structure 5 can effectively limit the optical film material 4. At the same time, by designing the limiting structure with a low shape, the stability of the limiting structure 5 is ensured while catering to the thinning of the backlight module.

[0073] In one embodiment, the retaining structure 5 has a retaining length in the second direction d2, and the ratio of the retaining length to the retaining thickness is between 1 and 2. By setting this ratio of the retaining length to the retaining thickness, the retaining structure 5 can effectively retain the optical film 4. At the same time, the low-profile retaining structure design caters to the thinning of the backlight module while ensuring the stability of the retaining structure 5.

[0074] In one embodiment, each light-shielding adhesive element 6 further includes a fourth light-shielding portion 64. In the first direction d1, the fourth light-shielding portion 64 is adjacent to and surrounds the fourth side 54 of the retaining structure 5. The fourth side 54 is opposite the first side 51 and is connected between the second side 52 and the third side 53. In actual operation, some light 7 emitted by the light-emitting unit 2 may be directed toward the fourth side 54 of the retaining structure 5. The provision of each fourth light-shielding portion 64 can block / absorb light directed toward the retaining structure 5 from different positions along the thickness direction d3. Furthermore, even if some light is emitted from the first side 51 of the retaining structure 5, opposite the fourth side 54, it can be absorbed by each first light-shielding portion 61. Consequently, the width of the fourth light-shielding portion 64 in the first direction d1 can be no greater than the width of the first light-shielding portion 61, thereby shortening the frame size of the backlight module 100. In this embodiment, by providing the first to fourth light-shielding portions, it is possible to ensure stable connection between the optical films while preventing light leakage from the limiting structure 5. Figures 1 to 4 As shown, the limiting structure 5 can be a quadrangular prism structure, but is not limited thereto, and can also be a cylindrical structure, for example.

[0075] See also Figure 5 , Figure 5 A partial cross-sectional schematic diagram of a backlight module according to another embodiment of the present invention is shown. In one embodiment, each optical film has a matching shape corresponding to each light-shielding adhesive element 6. In a first direction d1, the edge of each optical film 4 and each light-shielding adhesive element 6 adjacent to the first sidewall 11 does not extend beyond the edge of the light guide plate 3, or the edge of each light-shielding adhesive element 6 adjacent to the first side 11 extends beyond the edge of the corresponding optical film 4, or the edge of each light-shielding adhesive element 6 adjacent to the first side 11 is flush with the edge of the corresponding optical film 4. That is, in a second direction d2, the edge of the light-shielding adhesive element 6 can either not extend beyond the edge of the optical film 4, be flush with the edge of the optical film 4, or extend beyond the edge of the optical film 4. When the edge of the optical film material 4 is shorter than the edge of the shading adhesive element 6, that is, the edge of the shading adhesive element 6 exceeds the edge of the optical film material 4, so that the end of the shading adhesive element 6 away from each light-emitting element 2 is bonded between adjacent optical film materials 4, the end of the shading adhesive element 6 adjacent to each light-emitting element 2 is overlapped and bonded to each other, and near the light-emitting element 2, multiple layers of shading adhesive elements are overlapped and bonded to each other, and the overlapping bonding structure can be as follows Figure 5 The fourth side 54 of the limiting structure 5 may be extended above the light emitting unit 2 or may be attached to the side surface (or adjacent to the side surface) of the fourth side 54 of the limiting structure 5 to assist in limiting / guiding the transmission of light.

[0076] In one embodiment, the light-shielding adhesive element 6 is an integrated structure, so that during the assembly process of the backlight module 100, each light-shielding adhesive element 6 can be attached once to complete the assembly. Furthermore, the shape, size, and material of each light-shielding adhesive element 6 can be the same, thereby reducing the difficulty of assembly and improving the convenience of assembly. In one embodiment, the material of the light-shielding adhesive element can be a polymer material, a composite material, or an inorganic material, such as black tape based on PET, PVC, etc., black optical adhesive, polyimide (PI) tape, silicone tape, etc., but the present invention is not limited to this.

[0077] See also Figure 6 , Figure 6 A schematic diagram of a display device according to an embodiment of the present invention is shown. The present invention also provides a display device 1000 comprising a display panel 200 and the aforementioned backlight module 100. The backlight module 100 is disposed below the display panel 200 to provide backlight for the display panel 200. In one embodiment, the display panel 200 is supported, for example, on the top surfaces of the sidewalls of the backplate 1 and a portion of the top surface of the middle frame 8.

[0078] Compared with the prior art, the present invention discloses a backlight module and a display device, in which light-shielding adhesive elements are stacked correspondingly on each optical film material, and each light-shielding adhesive element is adjacent to and surrounds a limiting structure to block light from multiple light-emitting elements toward the limiting structure, thereby avoiding the light leakage problem at the limiting structure.

[0079] The above disclosed contents are only preferred feasible embodiments of the present invention and do not limit the scope of the patent application of the present invention. Therefore, any equivalent technical changes made using the description and drawings of the present invention fall within the scope of the patent application of the present invention.

Claims

1. A backlight module, characterized in that: Include: A back plate having a bottom plate and a plurality of side walls connected to each other, wherein the bottom plate and the plurality of side walls enclose a receiving space, and the plurality of side walls include a first side wall; a plurality of light-emitting elements, disposed on the first side wall; a light guide plate, disposed in the accommodating space; At least one optical film material is disposed on the light guide plate, and each optical film material has a limiting portion; a limiting structure protruding from the first surface of the light guide plate and adjacent to an edge of the light guide plate facing the first side wall, the first surface facing away from the bottom plate, the limiting structure being used to cooperate with each limiting portion to limit the at least one optical film material; as well as At least one light-shielding adhesive element is stacked and disposed between each optical film material; wherein, Each light-shielding adhesive element is adjacent to and surrounds the limiting structure to shield the light emitted from the plurality of light-emitting elements toward the limiting structure.

2. The backlight module according to claim 1, wherein: Each light-shielding adhesive element is flattened and adhered to the surface of the corresponding optical film material, and along the thickness direction of the backlight module, each light-shielding adhesive element surrounds the limiting structure respectively.

3. The backlight module according to claim 2, wherein: In the thickness direction, each light-shielding adhesive element is respectively laid flat and adhered between two adjacent layers of optical film materials corresponding thereto and between the light guide plate and the adjacent optical film materials thereto.

4. The backlight module according to claim 2, wherein: The backlight module further comprises a middle frame connected to the plurality of side walls, and a first vertical projection of each light-shielding adhesive element on the bottom plate does not exceed a second vertical projection of the middle frame on the bottom plate.

5. The backlight module according to claim 4, wherein: Each light-shielding adhesive element surrounds the limiting structure and is in a U-shaped structure or a X-shaped structure.

6. The backlight module according to claim 5, wherein: Each light-shielding adhesive element includes a first light-shielding portion, a second light-shielding portion, and a third light-shielding portion that are connected to each other. In the first direction, the first light-shielding portion is adjacent to and surrounds the first side of the limiting structure. In the second direction, the second light-shielding portion and the third light-shielding portion are adjacent to and surround the opposite second side and third side of the limiting structure respectively. The first side is connected between the second side and the third side. The second direction is parallel to the extension direction of the first side wall, and the first direction is perpendicular to the second direction. In the first direction, the ratio of the width of the first light-shielding portion to the width of the limiting structure is between 1 and 2.

7. The backlight module according to claim 6, wherein: The limiting structure has a limiting thickness in the thickness direction and a limiting width in the first direction, and a ratio of the limiting width to the limiting thickness is between 1 and 2.

5.

8. The backlight module according to claim 7, wherein: The limiting structure has a limiting length in the second direction, and a ratio of the limiting length to the limiting thickness is between 1 and 2.

9. The backlight module according to claim 6, wherein: Each light-shielding adhesive element also includes a fourth light-shielding portion. In the first direction, the fourth light-shielding portion is adjacent to and surrounds the fourth side of the limiting structure. The fourth side is opposite to the first side, and the fourth side is connected between the second side and the third side. In the first direction, the width of the fourth light-shielding portion is not greater than the width of the first light-shielding portion.

10. The backlight module according to claim 2, wherein: Each optical film material has a matching shape corresponding to each light-shielding adhesive element. In the first direction, the edge of each optical film material and each light-shielding adhesive element adjacent to the first side wall does not exceed the edge of the light guide plate, or the edge of each light-shielding adhesive element adjacent to the first side wall exceeds the edge of the corresponding optical film material.

11. The backlight module according to claim 1, wherein: The light-shielding adhesive element is an integrated structure.

12. A display device comprising a display panel and the backlight module according to any one of claims 1 to 10.

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