Backlight module and display device

Abstract

The application discloses a backlight module and a display device. The backlight module comprises a back plate, a light source, a light guide plate and an optical film. The back plate comprises a bottom plate and a side plate. The side plate is connected to the bottom plate. The light source is arranged close to the side plate. The light guide plate is arranged on the bottom plate and opposite to the light source. The optical film is arranged on the side of the light guide plate away from the bottom plate. The light guide plate has a light inlet area, a center area and a light outlet area arranged in sequence along the direction away from the light source. The backlight module further comprises a light splitting piece. The light splitting piece is arranged on the side of the light guide plate away from the bottom plate and opposite to the light inlet area. The light splitting piece has an inclined surface facing the center area and the light outlet area. A first reflecting layer is arranged on the inclined surface. The first reflecting layer can reflect the light emitted by the light inlet area to the center area and / or the light outlet area and / or the optical film. The technical scheme of the application can make the light brightness of the whole backlight module more uniform.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a backlight module and a display device using the backlight module. Background Technology

[0002] As displays become thinner and larger, backlight uniformity in display modules has become a major challenge. For the currently common edge-lit backlight module design, controlling backlight uniformity is even more difficult. Therefore, the backlight uniformity of thin, narrow-bezel display devices needs improvement. Summary of the Invention

[0003] The main objective of this invention is to propose a backlight module that aims to improve the problem of uneven light output in backlight modules.

[0004] To achieve the above objectives, the present invention proposes a backlight module comprising a back plate, a light source, a light guide plate, and an optical film. The back plate includes a bottom plate and a side plate, the side plate being connected to the bottom plate. The light source is positioned close to the side plate. The light guide plate is disposed on the bottom plate and opposite to the light source. The optical film is disposed on the side of the light guide plate away from the bottom plate. The light guide plate includes an incident light area, a central area, and an exit light area sequentially distributed along a direction away from the light source. The backlight module further includes a beam splitter disposed on the side of the light guide plate away from the bottom plate, and the projection of the beam splitter on the light guide plate falls within the incident light area. The beam splitter has an inclined surface facing the central area and the exit light area, and a first reflective layer is provided on the inclined surface. The first reflective layer is capable of reflecting light emitted from the incident light area to the central area and / or the exit light area and / or the optical film.

[0005] In one embodiment, the back plate further includes a top frame, which is parallel to the bottom plate and connected to the side plate. The beam splitter further includes a connecting sidewall, which is disposed opposite to the inclined surface and connected to the inner sidewall of the top frame. The inclined surface is close to the optical film.

[0006] In one embodiment, the connecting sidewall is bonded to the inner wall of the top frame.

[0007] In one embodiment, the beam splitter further includes a bottom surface and a second reflective layer. The two opposite sides of the bottom surface are respectively connected to the bottom end of the connecting sidewall and the bottom end of the inclined surface, and the bottom surface abuts against the side of the light guide plate away from the base plate. The second reflective layer is disposed on the bottom surface.

[0008] In one embodiment, the backlight module further includes a reflector, which is disposed on the side of the top frame facing the bottom plate, with a portion of the reflector opposite to the light source and another portion opposite to the light guide plate.

[0009] In one embodiment, the light source includes a lamp panel and a plurality of spaced-apart LEDs disposed on the lamp panel;

[0010] The beam splitter is a strip-shaped body, and the length of the beam splitter is greater than or equal to the length of the lamp panel; or, the beam splitter is a block-shaped body, and multiple beam splitters are spaced apart, with the projection of each lamp bead on the side plate and the projection of a beam splitter on the side plate being opposite to each other in a direction perpendicular to the base plate.

[0011] In one embodiment, a plurality of pits are formed on the inclined surface.

[0012] In one embodiment, the inner wall of the recess is an arc surface.

[0013] In one embodiment, the top end of the inclined surface is flush with the top end of the optical film.

[0014] The present invention also proposes a display device, including a display panel and the aforementioned backlight module, wherein the display panel is disposed on the light-emitting surface of the backlight module.

[0015] The technical solution of this invention involves placing a beam splitter on the side of the light guide plate away from the back plate, with the beam splitter facing the light-incident area of ​​the light guide plate and having an inclined surface facing the light guide plate. A first reflective layer is provided on the inclined surface, which allows the beam splitter to reflect at least a portion of the stronger light from the light-incident area of ​​the light guide plate through the first reflective layer on the inclined surface of the beam splitter. This allows the light to be directed to the central area of ​​the light guide plate and / or the light-outcident area and / or the optical film, thereby increasing the brightness of the middle part and the side away from the light source of the entire backlight module, resulting in more uniform light output brightness throughout the entire backlight module. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an example backlight module according to Embodiment 1 of the present invention.

[0018] Figure 2 This is a schematic diagram of another example of the backlight module according to Embodiment 1 of the present invention;

[0019] Figure 3 This is a top view of an example of the light guide plate, light source, and beam splitter of a backlight module according to Embodiment 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of another example of the beam splitter in the backlight module of Embodiment 1 of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of an example display device according to Embodiment 2 of the present invention;

[0022] Figure 6 This is a schematic diagram of another example of the display device according to Embodiment 2 of the present invention.

[0023] Explanation of icon numbers:

[0024] label name label name 100 Back panel 110 base plate 120 Side panel 130 Top frame 200 light source 300 Light guide plate 301 Light Zone 302 Central area 303 light area 400 Optical films 500 Spectrometer 510 bevel 520 Connecting sidewalls 530 Bottom 501 pit 600 reflector 700 reflector 800 Frame 900 Display panel 910 Thin-film transistor array substrate 920 Color film substrate 930 Upper polarizer 940 Lower polarizer

[0025] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0029] Example 1:

[0030] This invention proposes a backlight module.

[0031] In embodiments of the present invention, such as Figures 1 to 3As shown, the backlight module includes a backplate 100, a light source 200, a light guide plate 300, and an optical film 400. The backplate 100 includes a base plate 110 and a side plate 120, with the side plate 120 connected to the base plate 110. The light source 200 is positioned close to the side plate 120. The light guide plate 300 is disposed on the base plate 110 and opposite to the light source 200. The optical film 400 is disposed on the side of the light guide plate 300 away from the base plate 110. The light guide plate 300 includes a light incident area 301 and a central area distributed sequentially along a direction away from the light source 200. The backlight module also includes a beam splitter 500, which is disposed on the side of the light guide plate 300 away from the base plate 110. The projection of the beam splitter 500 on the light guide plate 300 falls into the light entrance area 301. The beam splitter 500 has an inclined surface 510 facing the central area 302 and the light entrance area 303. A first reflective layer is provided on the inclined surface 510. The first reflective layer can reflect the light emitted from the light entrance area 301 to the central area 302 and / or the light entrance area 303 and / or the optical film 400.

[0032] The backlight module's backplate 100 has a base plate 110 and a side plate 120, which are connected to form a receiving cavity. The light source 200, light guide plate 300, and optical film 400 can all be housed within this cavity, thus providing better protection for them. By placing the light source 200 within the receiving cavity and positioning it close to the side plate 120, this backlight module is an edge-lit backlight module. Compared to a direct-lit backlight module, this reduces the number of light sources 200, lowers power consumption, and achieves a thinner and lighter design. However, in an edge-lit backlight module, because the light source 200 is located on the side of the light guide plate 300, the brightness of the light-emitting area 303 of the light guide plate 300, which is positioned opposite the light source 200, is lower than the brightness of the light-receiving area 301. It should be noted that the arrangement direction of the light-incident area 301, the central area 302, and the light-exit area 303 of the light guide plate 300 in the technical solution of the present invention is the direction from the light source 200 to the light guide plate 300. That is, the side of the light guide plate 300 closer to the light source 200 is the light-incident area 301, the central part of the light guide plate 300 is the central area 302, and the side of the light guide plate 300 away from the light source 200 is the light-exit area 303. From the light-incident area 301 to the light-exit area 303, the light intensity decreases step by step, thereby causing the brightness of the side of the backlight module closer to the light source 200 to be greater than the brightness of the central area of ​​the backlight module, and the brightness of the central area to be greater than the brightness of the side of the backlight module away from the light source 200. The backlight module in this invention also includes a beam splitter 500. The beam splitter 500 is disposed on the side of the light guide plate 300 away from the base plate 110 and has an inclined surface 510 facing the light guide plate 300. The projection of the beam splitter 500 on the light guide plate 300 falls into the light incident area 301, so that at least a portion of the stronger light from the light incident area 301 of the light guide plate 300 can irradiate the first reflective layer of the inclined surface 510 of the beam splitter 500, and can reflect the light reflected by the first reflective layer to the central area 302 of the light guide plate 300, or even the light emitting area 303 of the light guide plate 300, or can be directly reflected to the corresponding positions of the central area 302 and the light emitting area 303 of the optical film 400 of the light guide plate 300, thereby ensuring that the light output of the backlight module is more uniform.

[0033] Specifically, when the beam splitter 500 is disposed on the side of the light guide plate 300 away from the bottom plate 110 of the back plate 100, the beam splitter 500 can be disposed between the light guide plate 300 and the optical film 400; or the beam splitter 500 can also be disposed on the side of the optical film 400, as long as the light emitted by the light guide plate 300 near the light incident area 301 can illuminate the beam splitter 500, and be reflected by the first reflective layer on the inclined surface 510 of the beam splitter 500 to the central area 302 or the light output area 303 of the light guide plate 300, and then emitted through the optical film 400; or be directly reflected by the first reflective layer on the inclined surface 510 of the beam splitter 500 to the part of the optical film 400 corresponding to the central area 302 of the light guide plate 300. By setting a separate beam splitter 500 with an inclined surface 510 and setting a first reflective layer on the inclined surface 510 of the beam splitter 500, the problem of uneven light output in various parts of the backlight module can be improved. Compared with directly changing the parameters and structure of the optical film 400 and the light guide plate 300, the technical solution of the present invention can save more costs.

[0034] The technical solution of the present invention involves placing a beam splitter 500 on the side of the light guide plate 300 away from the bottom plate 110 of the back plate 100, with the beam splitter 500 facing the light entrance area 301 of the light guide plate 300 and having an inclined surface 510 facing the light guide plate 300. A first reflective layer is provided on the inclined surface 510. This allows the beam splitter 500 to reflect at least a portion of the stronger light from the light entrance area 301 of the light guide plate 300 through the first reflective layer on the inclined surface 510 of the beam splitter 500. This allows the light to be directed to the central area 302 of the light guide plate 300 and / or the light exit area 303 of the light guide plate 300 and / or the optical film 400, thereby increasing the brightness of the middle part of the entire backlight module and the side away from the light source 200, thus making the light output brightness of the entire backlight module more uniform.

[0035] In one example, such as Figure 1 or Figure 2 As shown, the back plate 100 also includes a top frame 130, which is parallel to the bottom plate 110 and connected to the side plate 120. The beam splitter 500 also includes a connecting side wall 520, which is opposite to the inclined surface 510 and connected to the inner side wall of the top frame 130. The inclined surface 510 is close to the optical film 400.

[0036] The base plate 110 of the back plate 100 is used to support components such as the light guide plate 300 and the optical film 400, while the side plates 120 of the back plate 100 are used to mount the light source 200 or to protect the light source 200. The back plate 100 also has a top frame 130. The top frame 130, side plates 120, and base plate 110 of the back plate 100 together form a receiving cavity, and this back plate 100 structure can serve as a lampshade structure, thereby reducing the risk of light leakage. In this example, by placing the beam splitter 500 on the side of the light guide plate 300 away from the base plate 110, the beam splitter 500 has a connecting sidewall 520 opposite to the inclined surface 510. This connecting sidewall 520 is connected to the inner sidewall of the top frame 130, and the inclined surface 510 is close to the optical film 400. This allows the beam splitter 500 to function as part of the lampshade, thus enabling a larger opening in the top frame 130 of the back plate 100, reducing the material cost of the top frame 130. Furthermore, it facilitates the installation of the light guide plate 300 through the opening in the top frame 130 of the back plate 100, reducing installation difficulty and the risk of impact during installation. It is understood that by connecting the connecting sidewall 520 of the beam splitter 500 to the inner sidewall of the top frame 130, the problem of excessive backlight module thickness due to the beam splitter 500 can also be avoided.

[0037] In one example, such as Figure 2 As shown, the back plate 100 may further include a top wall and an extended side wall. The extended side wall is disposed opposite to the connecting side wall 520, with one end connected to the top wall and the other end connected to the top of the inclined surface 510. The optical film at least partially abuts against the extended side wall. This arrangement allows the optical film 400 and the beam splitter 500 to be mutually positioned, reducing the risk of movement of the optical film 400. Furthermore, a portion of the optical film 400 may be disposed opposite to the inclined surface 510, with a gap between them. To ensure that this portion of the film also has a relatively stable state, the optical film 400 has a facing surface opposite to the inclined surface and an adjacent surface adjacent to the facing surface. The adjacent surface of the optical film 400 may have a latching protrusion structure, so that the back plate 100 or the frame has a latching groove that engages with the latching protrusion, thereby ensuring that the optical film 400 has a stable state and preventing it from moving towards or away from the inclined surface 510. Alternatively, the adjacent surfaces of the optical film may have slots, and the back plate 100 or the frame may have protrusions that can be inserted into the slots, thereby ensuring that the optical film 400 has a stable state and preventing it from moving toward or away from the inclined surface 510.

[0038] Specifically, such as Figure 2 As shown, the side wall 520 is bonded to the inner wall of the top frame 130.

[0039] By bonding the connecting sidewall 520 to the inner wall of the top frame 130, the connection between the beam splitter 500 and the back panel 100 becomes simpler and the connection cost is lower. In addition, bonding the two together can reduce the gap between the connecting sidewall 520 and the top frame 130, thereby reducing the risk of light leakage through the gap.

[0040] Of course, in other embodiments, the sidewall 520 and the top frame 130 can also be connected by other methods, such as welding, magnetic connection, snap-fit ​​connection, riveting, etc.

[0041] Furthermore, such as Figures 2 to 4 As shown, the beam splitter 500 also includes a bottom surface 530, with the two opposite sides of the bottom surface 530 connected to the bottom end of the connecting sidewall 520 and the bottom end of the inclined surface 510, respectively, and the bottom surface 530 abuts against the side of the light guide plate 300 away from the bottom plate 110.

[0042] The beam splitter 500 also includes a bottom surface 530, and the bottom end of the inclined surface 510 is connected to the bottom surface 530. This increases the contact area between the beam splitter 500 and the light guide plate 300, reduces the pressure exerted by the beam splitter 500 on the light guide plate 300, and thus reduces the risk of deformation of the light guide plate 300 under pressure. Furthermore, by having the bottom surface 530 of the beam splitter 500 abut against the side of the light guide plate 300 away from the base plate 110, there is no gap between the beam splitter 500 and the light guide plate 300, thereby preventing light leakage from the gap between them. In addition, with this configuration, the inclined surface 510 of the beam splitter 500 also faces the light emission area 303 of the light guide plate 300, so that the light from the light input area 301 of the light guide plate 300 can be dispersed by the beam splitter 500 to the central area 302 and / or the light emission area 303, thereby ensuring a more uniform light emission effect of the backlight module.

[0043] It should be noted that the terms "bottom" and "top" in this invention are based on the state in which the backlight module is placed horizontally and the back plate 100 is closer to the ground.

[0044] Furthermore, a second reflective layer is provided on the bottom surface 530.

[0045] By also providing a second reflective layer on the bottom surface 530, the light emitted from the light guide plate 300 at the position corresponding to the bottom surface 530 can be blocked and reflected to the central area 302. The light is then reflected by the first reflective layer on the inclined surface 510 of the beam splitter 500 so that the light enters the central area of ​​the optical film 400, thereby improving the uniformity of light output and increasing the utilization rate of light.

[0046] Furthermore, such as Figure 3As shown, the light source 200 includes a lamp board 210 and a plurality of spaced lamp beads 220 disposed on the lamp board 210; in one example, the beam splitter 500 is a strip-shaped body, and the length of the beam splitter 500 is greater than or equal to the length of the lamp board 210.

[0047] This configuration ensures that the beam splitter 500 corresponds to the lamp panel 210 along its length. This means that the light emitted by the lamp beads 220 of the lamp panel 210 is reflected by the beam splitter 500 after passing through the light entrance area 301 of the light guide plate 300, and then reflected to the central area 302 or the light exit area 303. This ensures that the light intensity at the position of the light entrance area 302 corresponding to the lamp panel 210 is not too strong.

[0048] Alternatively, in another example, the beam splitter 500 is a block shape, and multiple beam splitters 500 are spaced apart. The projection of each lamp bead 220 on the side plate 120 and the projection of a beam splitter 500 on the side plate 120 are arranged opposite each other in the direction perpendicular to the bottom plate 110.

[0049] This configuration ensures that the light emitted by the LED 220 through the light guide plate 300 and entering the light area 301 is reflected by the beam splitter 500 to the central area 302 or the light exit area 303, thus guaranteeing that the light intensity at the location of the light panel 210 corresponding to the light area 302 will not be too strong. Furthermore, in this example, if multiple beam splitters 500 are partially damaged or fail, it is easy to replace the beam splitter 500 at the corresponding location, thereby reducing replacement costs.

[0050] Based on the above-mentioned scheme where the beam splitter 500 has an inclined surface 510, in this example, as Figures 1 to 4 As shown, multiple pits 501 are formed on the inclined surface 510.

[0051] By forming multiple pits 501 on the inclined surface 510, the first reflective layer on the inclined surface 510 is uneven, thereby increasing the reflection angle and enabling light to be reflected in all directions, achieving a better diffusion effect and ensuring more uniform light output from the backlight module.

[0052] Specifically, multiple recesses 501 can be arranged in an array on the inclined surface 510; or the recesses 501 can be arranged in multiple rows, with adjacent rows of recesses 501 staggered. This arrangement allows the multiple recesses 501 to form multiple dots on the inclined surface 510, ensuring that light incident on the inclined surface 510, when reflected by the recesses 501 to the central area 302 and / or the light-emitting area 303 and / or the optical film 400 of the light guide plate 300, achieves a more diffused effect. The shape of the recesses 501 can be semi-circular, rectangular, triangular, or other shapes.

[0053] In one example, such as Figure 4As shown, the inner wall of the pit 501 is an arc surface.

[0054] By setting the inner wall of the recess 501 to an arc surface, the dispersion effect of the reflected light can be improved, thereby further improving the light output uniformity of the backlight module.

[0055] Specifically, such as Figures 1 to 3 As shown, the top of the inclined surface 510 is flush with the top of the optical film 400, or it can be lower than or higher than the top of the inclined surface 510. The goal is to ensure that as much light reflected by the first reflective layer of the inclined surface 510 as possible propagates onto the central region 302 and / or the light-emitting region 303 and / or the optical film 400 of the light-guiding plate 300, thereby improving the light emission uniformity of the backlight module.

[0056] Furthermore, such as Figure 2 As shown, the backlight module also includes a reflector 600, which is located on the side of the top frame 130 facing the bottom plate 110. A portion of the reflector 600 is positioned opposite the light source 200, and another portion is positioned opposite the light guide plate 300.

[0057] It is understandable that the light emitted by the light source 200 is divergent. By setting a reflector 600 on the side of the top frame 130 facing the bottom plate 110, with a part of the reflector 600 facing the light source 200 and another part facing the light guide plate 300, some of the light emitted by the light source 200 of the backlight module can be reflected by the reflector 600 into the light guide plate 300 after hitting the reflector 600. This increases the amount of light entering the light guide plate 300, improves the light utilization rate, and ensures that the backlight module can emit high-brightness light.

[0058] Furthermore, a reflective sheet 700 may also be provided on the side of the light guide plate 300 facing the bottom plate 110 of the back plate 100. This allows the reflective sheet 700 to have a light-shielding function, and also to reflect the light propagating from the light guide plate 300 toward the bottom plate 110 of the back plate 100 to the light-emitting area 303 of the backlight module, thereby ensuring that the backlight module has a large light output brightness and improving the light utilization rate.

[0059] Example 2:

[0060] The present invention also proposes a display device, such as Figure 5 and Figure 6 As shown, the display device includes a display panel 900 and a backlight module. The specific structure of the backlight module is as described in the above embodiments. Since this display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The display panel 900 is disposed on the light-emitting surface of the backlight module.

[0061] By placing the display panel 900 on the light-emitting surface of the backlight module, the backlight module provides light to the display panel 900, making it easier for users to see the image on the display panel 900. Specifically, a frame 800 may be provided outside the display panel 900, and the frame 800 is bonded to the back plate 100 with adhesive, thereby achieving a stable connection between the display panel 900 and the backlight module. The display panel 900 may include a thin-film transistor array substrate 910, a color filter substrate 920, an upper polarizer 930, and a lower polarizer 940. The thin-film transistor array substrate 910 and the color filter substrate 920 are arranged opposite to each other, with the color filter substrate 920 located on the side of the thin-film transistor array substrate 910 away from the backlight module, the lower polarizer 940 located on the side of the thin-film transistor array substrate 910 facing the backlight module, and the upper polarizer 930 located on the side of the color filter substrate 920 away from the backlight module.

[0062] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A backlight module, comprising a backplate, a light source, a light guide plate, and an optical film, wherein the backplate comprises a base plate and a side plate, the side plate is connected to the base plate, the light source is disposed close to the side plate, the light guide plate is disposed on the base plate and opposite to the light source, and the optical film is disposed on the side of the light guide plate away from the base plate; the light guide plate comprises an incident light area, a central area, and an exit light area sequentially distributed along a direction away from the light source; Its features are, The backlight module further includes a beam splitter, which is disposed on the side of the light guide plate away from the base plate. The projection of the beam splitter on the light guide plate falls into the light incident area. The beam splitter has an inclined surface facing the central area and the light emitting area. A first reflective layer is provided on the inclined surface. The first reflective layer can reflect the light emitted from the light incident area to the central area and / or the light emitting area and / or the optical film. The first reflective layer on the inclined surface is uneven.

2. The backlight module as described in claim 1, characterized in that, The back plate also includes a top frame, which is parallel to the bottom plate and connected to the side plate. The beam splitter also includes a connecting sidewall, which is disposed opposite to the inclined surface and connected to the inner sidewall of the top frame. The inclined surface is close to the optical film.

3. The backlight module as described in claim 2, characterized in that, The connecting sidewall is bonded to the inner wall of the top frame.

4. The backlight module as described in claim 2, characterized in that, The beam splitter also includes a bottom surface and a second reflective layer. The two opposite sides of the bottom surface are respectively connected to the bottom end of the connecting sidewall and the bottom end of the inclined surface, and the bottom surface abuts against the side of the light guide plate away from the bottom plate. The second reflective layer is disposed on the bottom surface.

5. The backlight module as described in claim 2, characterized in that, The backlight module also includes a reflector, which is located on the side of the top frame facing the bottom plate, with a portion of the reflector opposite to the light source and another portion opposite to the light guide plate.

6. The backlight module as described in any one of claims 1 to 5, characterized in that, The light source includes a lamp panel and a plurality of spaced-apart lamp beads disposed on the lamp panel; The beam splitter is a strip-shaped body, and the length of the beam splitter is greater than or equal to the length of the lamp panel; or, the beam splitter is a block-shaped body, and multiple beam splitters are spaced apart, with the projection of each lamp bead on the side plate and the projection of a beam splitter on the side plate being opposite to each other in a direction perpendicular to the base plate.

7. The backlight module as described in any one of claims 1 to 5, characterized in that, Multiple pits are formed on the inclined surface.

8. The backlight module as described in claim 7, characterized in that, The inner wall of the pit is curved.

9. The backlight module as described in claim 7, characterized in that, The pits are arranged in a matrix; or the pits are arranged in multiple rows, with adjacent rows of pits staggered.

10. A display device, characterized in that, It includes a display panel and a backlight module as described in any one of claims 1 to 9, wherein the display panel is disposed on the light-emitting surface of the backlight module.

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