Direct-lit backlight module having embedded-assembly middle frame, and display device

Abstract

A direct-lit backlight module having an embedded-assembly middle frame, comprising a back plate, a light source unit, an optical element, and a middle frame. The back plate comprises a bottom surface and a side wall. The side wall has a first vertical surface connected to the bottom surface, a first bearing surface, a second vertical surface located outside the first vertical surface, and a second bearing surface higher than the first bearing surface. The light source unit is located in the back plate. The optical element is located above the light source unit. The middle frame is provided with a top plate, a side plate connected to the top plate, and a bonding portion. The bonding portion is located on at least one of the first bearing surface, the second vertical surface, and the second bearing surface of the side wall, and is used for bonding the middle frame to the back plate, so that the top plate is located above part of the optical element. The present invention further provides a display device comprising the direct-lit backlight module.

Description

Direct-lit backlight module and display device with an embedded assembly mid-frame Technical Field

[0001] This invention relates to a backlight module, and more precisely, to a backlight module that can be designed with a narrow bezel and a display device comprising the same. Background Technology

[0002] A direct-lit backlight module comprises a light source unit, optical elements, and a display panel, stacked sequentially from bottom to top. The light emitted by the light source unit forms a uniform surface light source after passing through the optical elements, and is then projected onto the display panel. The light source unit and the display panel can be positioned on the bottom surface and top opening inside the back panel of the backlight module, respectively. The optical elements (such as diffusers or optical films) are set on the edge of the frame or back panel, and multiple steps are used as fixing structures.

[0003] To maintain the uniformity of the light source projected onto the display panel, the area of ​​the optical element is larger than that of the display panel. The lower surface of the optical element can be supported on the back plate steps, and at least one bezel (middle frame) is required above the optical element to shield the edges of the optical element and limit its movement. Since the middle frame is also attached to the surface of another higher step on the back plate, it defines an opaque area. This means that the bezel width designed for mounting in the middle frame structure significantly limits the width of the visible area of ​​the display panel on the display device, making it difficult to design a display device with a narrow bezel. In other words, the edge of the back plate has at least three steps to fix the optical element, the middle frame, and the display panel respectively, resulting in the problem of excessively wide edges in conventional direct-lit backlight modules. Therefore, the motivation for this application is to develop a direct-lit backlight module that reduces the bezel width. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides a direct-lit backlight module. By modifying the mounting structure between the mid-frame and the backlight module backplate, the bezel width is reduced, and the ineffective area where light cannot reach is minimized, thereby achieving the effect of a narrow bezel.

[0005] Accordingly, the present invention provides a direct-lit backlight module comprising a backplate, a light source unit, a plurality of optical elements, and a mid-frame. The backplate includes a bottom surface and a side wall, the bottom surface and the side wall forming an accommodating space. The side wall has a first elevation, a first bearing surface, a second elevation, and a second bearing surface. The first elevation is connected to the bottom surface, the second elevation is located outside the first elevation, and the second bearing surface is higher than the first bearing surface. The light source unit is located within the accommodating space of the backplate and is surrounded by the side wall. The optical elements are located on the light source unit. The mid-frame is disposed within the accommodating space and has a top plate, a side plate connected to the top plate, and a connecting portion. The connecting portion is positioned at at least one of the first bearing surface, the second elevation, and the second bearing surface of the side wall to allow the mid-frame to connect with the backplate. The top plate extends toward the optical element and is located above the optical element.

[0006] In some embodiments, the side panel extends in a direction parallel to the extension direction of the second facade.

[0007] In some embodiments, the joint portion of the middle frame includes an outwardly extending ear, and the second bearing surface of the sidewall includes a groove into which the ear fits.

[0008] In some embodiments, the joint includes a through hole that is detachably connected to a protrusion on the second facade.

[0009] In some embodiments, the joint includes a perforation, and a notch is formed between the side plate and the joint.

[0010] In some embodiments, the sidewall has a vertical opening formed on the first bearing surface, the vertical opening forming a connecting space in the sidewall, the connecting portion of the middle frame being inserted through the vertical opening, such that a through hole of the connecting portion is connected to a protrusion of the sidewall in the connecting space.

[0011] In some embodiments, the sidewall also has a lateral opening communicating with the mating space, so that the mating portion and the protrusion are exposed on the outside of the back panel.

[0012] In some embodiments, the joint includes a spring plate with its end face extending in the opposite direction to the end face of the side plate, and the spring plate abutting against the second vertical surface.

[0013] In some embodiments, the joint includes a spring tab, and a notch is formed between the side plate and the joint.

[0014] In some embodiments, the second facade further includes a recessed wall for accommodating the joint.

[0015] In some embodiments, the spring sheet further includes a protrusion, and the second face further includes a groove, the protrusion abutting against the groove.

[0016] In some embodiments, the optical element is disposed on the first bearing surface of the sidewall.

[0017] In some embodiments, the optical element further includes a reflector and a diffuser, the reflector being located between the first bearing surface and the diffuser.

[0018] In some embodiments, the reflector extends along the surface of the first facade toward the bottom surface.

[0019] The present invention also provides a display device comprising any of the aforementioned direct-lit backlight modules and a display panel disposed on a second bearing surface of the back plate. Attached Figure Description

[0020] Figure 1 is an external view of the display device.

[0021] Figure 2 is a partial exploded view of the components of a first embodiment of the display device.

[0022] Figure 3 is a cross-sectional view of the first embodiment of the display device.

[0023] Figure 4 is one view of the direct-lit backlight module and its mid-frame of the embodiment in Figure 3.

[0024] Figure 5 is another view of the direct-lit backlight module and its mid-frame of the embodiment in Figure 3.

[0025] Figure 6 is a cross-sectional view of a second embodiment of the display device.

[0026] Figure 7 is one view of the direct-lit backlight module and its mid-frame of the embodiment in Figure 6.

[0027] Figure 8 is a cross-sectional view of a third embodiment of the display device.

[0028] Figure 9 is one view of the direct-lit backlight module and its mid-frame of the embodiment in Figure 8.

[0029] Figure 10 is another view of the direct-lit backlight module and its mid-frame of the embodiment in Figure 8.

[0030] Figure 11 is a cross-sectional view of a fourth embodiment of the display device.

[0031] Figure 12 is one view of the direct-lit backlight module and its mid-frame of the embodiment in Figure 11.

[0032] Figure 13 is another view of the direct-lit backlight module and its mid-frame of the embodiment in Figure 11. Detailed Implementation

[0033] The directional descriptions described below are based on the light emission direction of the direct-lit backlight module as upward. The accommodating space defined by the backplate of the backlight module for mounting the various components is defined as the inner side, and vice versa, in accordance with the common understanding of those skilled in the art.

[0034] Please refer to Figures 1 to 5, which illustrate an embodiment of the direct-lit backlight module of the present invention. This direct-lit backlight module can be applied to a display device including a display panel 40. In a preferred embodiment of the direct-lit backlight module, it includes a back plate 10, a light source unit 30, a plurality of optical elements 50, and a mid-frame 20. The back plate 10 includes a bottom surface 111 and a side wall 12. The bottom surface 111 and the side wall 12 together form an accommodating space. The side wall 12 has a first elevation 131, a first bearing surface 132, a second elevation 133, and a second bearing surface 134. The first elevation 131 is connected to the bottom surface 111. The second elevation 133 is located outside the first elevation 131, and the second bearing surface 134 is higher than the first bearing surface 132. The light source unit 30 is located within the accommodating space of the back plate 10 and is surrounded by the side wall 12. Multiple optical elements 50 are located on the light source unit 30. The middle frame 20 is disposed within the accommodating space. The middle frame 20 has a top plate 21, a side plate 22 connected to the top plate 21, and a connecting part 23. The connecting part 23 is positioned on at least one of the first bearing surface 132, the second vertical surface 133, and the second bearing surface 134 of the side wall 12 to allow the middle frame 20 to be connected to the back plate 10. The top plate 21 extends toward the optical element 50 and is located above the optical element 50.

[0035] This invention ingeniously designs a back panel structure, with its sidewall 12 forming an accommodating space that effectively concentrates and guides the light from the light source unit 30 to the display panel 40. More importantly, the design of the sidewall 12 provides a stable structural support and a mounting platform for the optical element 50, the mid-frame 20, and the display panel 40. The height difference between the first bearing surface 132 and the second bearing surface 134 of the sidewall 12 allows the optical element 50 and the display panel 40 to be respectively attached to the different height steps of the back panel 10, while the mid-frame 20 is integrated with the embedded assembly structure of the sidewall 12 of the back panel 10, achieving a narrow bezel effect.

[0036] In one embodiment, the boundaries of the first facade 131, the first bearing surface 132, the second facade 133, and the second bearing surface 134 of the side wall 12 are sequentially connected to form a step. As shown in Figures 4 and 5, at some locations on the side wall 12, the second bearing surface 134 includes a groove 15. The bottom surface of the groove 15 is lower than the bottom of the second bearing surface 134 on which the display panel 40 is mounted, but higher than the first bearing surface 132. The groove 15 is configured to support the joint 23.

[0037] In one embodiment, as shown in Figures 2 to 5, the side plate 22 of the middle frame 20 surrounds the lateral surface of the optical element 50 in the thickness direction. The connecting portion 23 of the middle frame 20 includes an ear 24 extending outward from the edge of the top plate 21. The ear 24 fits into the groove 15 to connect the middle frame 20 with the back plate 10, so that the top plate 21 extends toward the optical element 50, and the inner closed profile of the top plate 21 is located above the optical element 50. Preferably, the ear 24 can be attached to the bottom surface of the groove 15 through an adhesive strip 25B. The precise fit between the ear 24 and the groove 15 on the back plate 10 ensures a stable connection between the middle frame 20 and the back plate 10, effectively preventing damage caused by vibration during transportation or use.

[0038] When this type of direct-lit backlight module is applied to a display device, the bottom of the display panel 40 is fixed to the second support surface 134 of the direct-lit backlight module through an adhesive strip 40A. The adhesive strip 40A is also attached to the upper surface of the ear 24. The display panel 40 can be stably supported by the second support surface 134 and the ear 24.

[0039] In another embodiment, even if the middle frame 20 does not have an ear 24 extending outward as a positioning means, double-sided tape can be added at the overlap of the side plate 22 of the middle frame 20 and the second facade 133 to combine the middle frame 20 with the back plate 10, which can also achieve the effect of a narrow frame.

[0040] In this embodiment, the bottom surface of the groove 15 supports the ear portion 24 of the middle frame 20, while the first bearing surface 132 supports the end face 221 of the side plate 22 of the middle frame 20, ensuring that the middle frame 20 can be stably supported, allowing the top plate 21 to surround a portion of the upper surface of the optical element 50. However, in other embodiments, the end face 221 of the side plate 22 may not contact the first bearing surface 132, and the middle frame 20 may be supported by the ear portion 24. The adhesive strip 25B between the ear portion 24 and the middle frame 20 can also ensure a stable connection between the middle frame 20 and the back plate 10.

[0041] In one embodiment, as shown in Figures 2 to 5, the extending direction of the side plate 22 of the middle frame 20 is parallel to the extending direction of the second facade 133. This allows the middle frame 20 to be directly inserted downwards into the receiving space, simplifying the assembly process and ensuring structural stability.

[0042] In one embodiment, as shown in Figures 2 to 5, the light source unit 30 includes a lamp plate 31 and a plurality of light-emitting elements 32. The light-emitting elements 32 are mounted on the upper surface of the lamp plate 31. The lamp plate 31 is disposed on the bottom surface 111 of the back plate 10, so that the light source unit 30 is located in the accommodating space of the back plate 10, and the light-emitting elements 32 emit light upward or sideways.

[0043] In one embodiment, the plurality of optical elements 50 are located on the light source unit 30. As shown in FIG3, the optical element 50 in this embodiment may include a diffuser plate 51. Preferably, it also includes an optical film 52 with other properties, such as a prism sheet, a brightening sheet, or a diffuser sheet, but is not limited thereto. The optical film 52 is located above the diffuser plate 51 and is configured to adjust the remaining optical properties of the projected light.

[0044] In one embodiment, as shown in Figures 2 to 5, the optical element 50 is disposed on the first supporting surface 132 of the sidewall 12, supported by the first supporting surface 132, and located above the light source unit 30. The optical element 50 includes a diffuser plate 51, which mixes the light projected by the light source unit 30, and homogenizes or adjusts the uniformity of the emitted light. To more clearly identify the correspondence of the components, a portion of the optical element 50 is removed in Figures 3 and 4.

[0045] In one embodiment, as shown in Figures 2 to 5, the upper boundary of a portion of the second facade 133 connects to the second bearing surface 134, and the upper boundary of another portion of the second facade 133 connects to the bottom surface of the groove 15. The surface of the top plate 21 and the surface of the ear 24 are on the same plane, but both are lower than the second bearing surface 134. The ear 24 extends below the adhesive strip 40A used to fix the bottom of the display panel 40. With this structural matching, the inner side of the back plate 10 does not need to have an additional step ring around it for mounting the middle frame 20, which can reduce the generation of ineffective areas.

[0046] In one embodiment, an adhesive strip 25A is further provided on the lower surface of the top plate 21 of the middle frame 20. The adhesive strip 25A is located above a portion of the surface of the optical element 50 to prevent the optical element 50 from being scratched due to direct contact with the middle frame 20. When the display device is stationary, the adhesive strip 25A may or may not contact the surface of the optical element 50.

[0047] In one embodiment, the optical element 50 further includes a reflective structure 55, which includes a reflective sheet 56 disposed on the first support surface 132, with the reflective sheet 56 located between the first support surface 132 and the diffuser plate 51. Since the light emitted by the lower light-emitting element 32 is difficult to reach the position of the first support surface 132, the light projected from the lateral surface of the edge of the diffuser plate 51 can be reflected by the reflective sheet 56, as shown in FIG. 3, and re-enter the interior of the diffuser plate 51. In addition, the reflective sheet 56 can also extend below the end face 221 of the side plate 22 to reflect light upwards, thereby supplementing the luminance above the first support surface 132 and improving optical uniformity.

[0048] In one embodiment, the reflective structure 55 may further include the reflector 57, which extends along the surface of the first facade 131 toward the bottom surface 111, reflecting the light beam projected by the light-emitting element 32 of the light source unit 30 toward the first facade 131 into the interior for reuse, thereby improving light extraction efficiency. Furthermore, the reflector 56 and the reflector 57 may also be formed by bending the same reflector.

[0049] In one embodiment, the reflective structure 55 may further include a reflective sheet 58 located on the upper surface of the lamp plate 31. The reflective sheet 58 has multiple openings corresponding to expose the light-emitting element 32, which reflects the light projected onto the lamp plate 31 below the diffuser plate 51 upwards again, thereby improving the luminous efficiency.

[0050] Please refer to Figures 6 and 7, which illustrate another type of direct-lit backlight module. The direct-lit backlight module includes a backplate 10, a light source unit 30, multiple optical elements 50, and a mid-frame 20. The arrangement of the light source unit 30 and the optical elements 50 is similar to that of the previous embodiment, and therefore will not be described again.

[0051] In this embodiment, the side wall 12 of the back panel 10 has a first elevation 131, a first bearing surface 132, a second elevation 133, and a second bearing surface 134. The first elevation 131 is connected to the bottom surface 111, the second elevation 133 is located outside the first elevation 131, and the second bearing surface 134 is higher than the first bearing surface 132. The side wall 12 also has a vertical opening 161 formed in the first bearing surface 132, and the vertical opening 161 forms a connecting space within the side wall 12.

[0052] The connecting portion 23 of the middle frame 20 extends downward from the boundary of the side plate 22, and the connecting portion 23 includes a through hole 23A. The connecting space defined by the side wall 12 corresponds to the connecting portion 23 of the middle frame 20. The connecting portion 23 of the middle frame 20 is inserted through the vertical opening 161, so that the through hole 23A of the connecting portion 23 engages with a protrusion 17 of the side wall 12 in the connecting space, thereby connecting the middle frame 20 to the back plate 10, such that the side plate 22 surrounds the lateral surface of the optical element 50 in the thickness direction, and the top plate 21 supports the optical element 50 above it. In other words, the connecting part 23 of the middle frame 20 is located on the side plate 22 and extends toward the bottom surface 111 of the back plate 10. Thus, the connecting part 23 extending toward the bottom surface 111 can be inserted into the connecting space through the vertical opening 161. Therefore, the connecting part 23 of the middle frame 20 is embedded in the back plate 10, thereby achieving the effect of a narrow frame.

[0053] From the three-dimensional cross-sectional view, outside the joint space of the side wall 12, the boundaries of the first facade 131, the first bearing surface 132, and the second facade 133 are sequentially connected to form steps. With this structural matching, the joint position of the middle frame 20 and the back plate 10 is located below the first bearing surface 132. The inner side of the back plate 10 does not need to have an additional bearing surface perpendicular to the facade for installing the middle frame 20. This not only reduces the generation of ineffective areas but also improves the stability of the structure and the convenience of assembly, avoiding the loosening or falling off problems that may be caused by traditional screw fixing methods.

[0054] When this type of direct-lit backlight module is applied to a display device, the bottom of the display panel 40 is fixed to the second support surface 134 of the direct-lit backlight module through an adhesive strip 40A, so that the display panel 40 can be stably supported by the second support surface 134.

[0055] In one embodiment, the sidewall 12 also has a lateral opening 162 communicating with the mating space, exposing the boundary of the mating portion 23 and the protrusion 17 to the outer side of the back panel 10. This structure allows maintenance personnel to pry the mating portion 23 outward from the outside of the back panel 10, releasing the engagement between the through hole 23A of the mating portion 23 and the protrusion 17. After releasing the engagement, maintenance personnel can pop the mating portion 23 upward from the lateral opening 162 and then remove the middle frame 20 from the inside of the back panel 10. This also improves the convenience of disassembly and rework.

[0056] In one embodiment, the outline boundary of the perforation 23A of the joint 23 is lower than the first bearing surface 132 to prevent light projected from the lateral surface of the edge of the diffuser plate 51 from being projected toward the lateral opening 162, thus preventing light leakage.

[0057] Please refer to Figures 8 to 10, which illustrate another type of direct-lit backlight module. The direct-lit backlight module includes a backplate 10, a light source unit 30, multiple optical elements 50, and a mid-frame 20. The arrangement of the light source unit 30 and the optical elements 50 is similar to that of the previous embodiment, and therefore will not be described again.

[0058] In this embodiment, the boundaries of the first facade 131, the first bearing surface 132, the second facade 133 and the second bearing surface 134 of the side wall 12 of the back plate 10 are sequentially connected to form a step, and the second facade 133 includes a protrusion 17 facing inward.

[0059] The joint 23 of the middle frame 20 extends downward from the boundary of the top plate 21. The joint 23 includes a through hole 23A. The extension directions of the side plate 22 and the joint 23 are parallel to the extension direction of the second facade 133, but a notch 222 is formed between the side plate 22 and the joint 23, so that the sheet-like joint 23 can be deformed to a certain extent.

[0060] In this embodiment, the end face of the connecting portion 23 and the end face 221 of the side plate 22 are located on the same plane. When the side plate 22 of the middle frame 20 is inserted into the space between the optical element 50 and the second facade 133, the through hole 23A of the connecting portion 23 is detachably connected to the protrusion 17 of the second facade 133, allowing the middle frame 20 to connect with the back plate 10. With this structural matching, the connection position of the middle frame 20 and the back plate 10 will be shifted to the facade direction, which not only improves the stability of the connection but also has the advantages of easy assembly and disassembly, further improving production efficiency and reducing labor costs, and also reducing the generation of ineffective areas.

[0061] In one embodiment, after the middle frame 20 is assembled with the back plate 10, a gap can be maintained between the surface of the joint 23 facing the second facade 133 and the surface of the second facade 133, allowing maintenance personnel to insert tools through the gap, deform the joint 23 inward, release the engagement between the perforation 23A and the protrusion 17, and then remove the middle frame 20 from the inside of the back plate 10.

[0062] Furthermore, the middle frame 20 can be supported by the structural matching of the connecting part 23 and the protrusion 17, and the end face 221 of the side plate 22 can contact the first bearing surface 132 or the reflector 56 to ensure that the middle frame 20 can be stably supported, so that the top plate 21 is located above a portion of the optical elements 50. However, the middle frame 20 can also be supported solely by the structure of the connecting part 23 and the protrusion 17, without the end face 221 of the side plate 22 contacting the first bearing surface 132, so that the top plate 21 is located above a portion of the optical elements 50, ensuring a stable connection between the middle frame 20 and the back plate 10.

[0063] Please refer to Figures 11 to 13, which illustrate another type of direct-lit backlight module. This module includes a backplate 10, a light source unit 30, multiple optical elements 50, and a mid-frame 20. The arrangement of the light source unit 30 and the optical elements 50 is similar to that of the previous embodiment and will not be described again. It should be noted that in this embodiment, the mid-frame 20 extends along the second facade 133 and has an elastic connecting portion 23. This portion can apply a spring force to the sidewall 12 of the backplate 10 to achieve a supporting connection. Therefore, the connection between the mid-frame 20 and the backplate 10 does not require an additional load-bearing plane, thus achieving a narrow bezel effect.

[0064] In one embodiment, the connecting portion 23 of the middle frame 20 extends downward from the boundary of the top plate 21. Preferably, a notch 222 is formed between the side plate 22 and the connecting portion 23, allowing the sheet-like connecting portion 23 to deform to a certain extent. The connecting portion 23 includes a spring tab 23C, the end face of which extends in the opposite direction to the end face 221 of the side plate 22. When the side plate 22 of the middle frame 20 is inserted into the space between the optical element 50 and the second facade 133, the surface of the spring tab 23C abuts against the second facade 133, causing the middle frame 20 to connect with the back plate 10. With this structural matching, the connection position of the middle frame 20 and the back plate 10 will shift to the facade direction, which can also reduce the generation of invalid areas.

[0065] More preferably, in this embodiment, the second facade 133 further includes a groove 18, and the spring piece 23C further includes a protrusion 23B facing outward, with the protrusion 23B abutting against the groove 18. This ensures that the middle frame 20 can be relatively positioned against the back plate 10, reducing the occurrence of relative displacement. Furthermore, maintenance personnel can pry the U-shaped spring piece 23C inward from above the middle frame 20 to release the engagement between the protrusion 23B and the groove 18, making it easier to remove the middle frame 20 from above the back plate 10.

[0066] In one embodiment, the installation method of the middle frame 20 and the back plate 10 may be such that the spring piece 23C contacts the second vertical surface 133, the end face 221 of the side plate 22 contacts the first bearing surface 132 or the reflector 56, and the protrusion 23B enters the groove 18 for positioning.

[0067] In one embodiment, as shown in FIG12, since the spring piece 23C protrudes more than the side plate 22, preferably, the second facade 133 also includes a recessed wall 133A. The width of the second bearing surface 134 connected to the boundary of the recessed wall 133A is narrower than the width of the second bearing surface 134 connected to the boundary of the second facade 133 at other locations. In this way, the recessed wall 133A can be used to accommodate the spring piece 23C of the joint 23. In addition, the recessed wall 133A is provided with the groove 18, and the opening of the groove 18 faces inward. The joint of the protrusion 23B and the groove 18 will be located below the adhesive strip 40A, so that the portion of the spring piece 23C extending outward does not affect the preset narrow frame.

[0068] This invention provides a variety of ways to combine the mid-frame and backplate in a direct-lit backlight module, and adopts a simple and reliable structural design, achieving multiple benefits such as simplified assembly process, improved production efficiency, and reduced production costs. Due to its excellent optical performance, robust structural design, and simple assembly process, it is suitable for various display devices, such as LCD monitors, tablet computers, and laptops. Applying this invention to display devices further highlights its advantages in improving display quality and reducing production costs.

[0069] This invention presents a direct-lit backlight module with an in-frame assembly capability. Compared to traditional direct-lit backlight modules with three steps, this invention's in-frame assembly allows the optical elements and display panel to be integrated into two steps of the back panel, while the mid-frame is integrated into the sidewalls of the back panel via an in-frame assembly structure. This not only achieves a narrow bezel effect but also considers optical efficiency, structural strength, and ease of assembly. In summary, this invention provides a direct-lit backlight module with an in-frame assembly capability, which has broad application prospects in the display industry and can effectively improve the overall performance and user experience of display devices. The innovation and practicality of this invention's technical solution give it significant market competitiveness.

[0070]

Symbol Explanation

Claims

1. A direct-lit backlight module with an embeddable assembly frame, comprising: The back panel includes a bottom surface and a side wall. The bottom surface and the side wall together form an accommodating space. The side wall has a first elevation, a first bearing surface, a second elevation, and a second bearing surface. The first elevation is connected to the bottom surface. The second elevation is located outside the first elevation, and the second bearing surface is higher than the first bearing surface. The light source unit is located within the receiving space of the back panel and is surrounded by the side wall; Multiple optical elements are located on this light source unit; as well as A middle frame is disposed within the accommodating space. The middle frame has a top plate, a side plate connected to the top plate, and a joint portion. The joint portion is positioned on at least one of the first bearing surface, the second elevation surface, and the second bearing surface of the side wall to allow the middle frame to be joined with the back plate. The top plate extends toward the optical element and is located above the optical element. 2.The in-cell assembled frame-integrated direct-type backlight module of claim 1, wherein, The side panel extends in a direction parallel to the direction of extension of the second facade. 3.The in-cell assembled frameless direct backlight module according to claim 1, wherein, The joint of the middle frame includes an outwardly extending lug, and the second bearing surface of the sidewall includes a groove into which the lug fits. 4.The in-cell assembled frameless direct backlight module of claim 1, wherein, The joint includes a perforation that is detachably connected to a protrusion on the second facade. 5.The in-cell assembled frameless direct backlight module according to claim 4, wherein, A gap is formed between the side plate and the joint. 6.The in-cell assembled frameless direct-type backlight module according to claim 1, wherein, The side wall has a vertical opening formed on the first bearing surface. The vertical opening forms a connecting space in the side wall. The connecting part of the middle frame is inserted through the vertical opening, so that the perforation of the connecting part is connected to the protrusion of the side wall in the connecting space. 7.The in-cell assembled frameless straight-down backlight module of claim 6, wherein, The sidewall also has a lateral opening connecting the joint space, so that the joint and the protrusion are exposed on the outside of the back plate.

8. The direct-lit backlight module with an embeddable assembly frame as described in claim 1, wherein, The joint includes a spring plate, the end face of which extends in the opposite direction to the end face of the side plate, and the spring plate abuts against the second vertical surface. 9.The in-cell assembled frameless straight-down backlight module of claim 8, wherein, A gap is formed between the side plate and the joint. 10.The in-cell assembled frameless straight-down backlight module of claim 8, wherein, The second facade also includes a recessed wall to accommodate the joint.

11. The direct-lit backlight module with an embeddable assembly frame as described in claim 8, wherein, The spring also includes a protrusion, and the second face also includes a groove, with the protrusion abutting against the groove. 12.The in-cell assembled frameless direct-type backlight module according to claim 1, wherein, The optical element is disposed on the first bearing surface of the sidewall.

13. The direct-lit backlight module with an embeddable assembly frame as described in claim 1, wherein, The optical element also has a reflector and a diffuser, with the reflector located between the first bearing surface and the diffuser.

14. The direct-lit backlight module with an in-frame as described in claim 13, wherein the reflector extends along the surface of the first facade toward the bottom surface.

15. A display device comprising: A direct-lit backlight module with an in-frame assembly as described in any one of claims 1 to 14; and The display panel is located on the second bearing surface of the back panel.

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