Backlight module and display device

Abstract

The utility model provides a kind of backlight unit and display device, the backlight unit includes backplate, glue frame and optical film layer;Glue frame includes the glue frame main part and glue frame extension part being connected, glue frame main part is arranged around the outer circumferential side of backplate, glue frame extension part is extended to the upper of backplate by glue frame main part, and positioning slot is set in the side close to backplate;Optical film layer includes optical film body and the convex part bently connected with optical film body, optical film body is set in the accommodating cavity of backplate, at least part convex part is set in positioning slot, so as not to set gap for the positioning of optical film layer on backplate, the accurate positioning of optical film layer can be realized, avoid the problem of local structure strength decline caused by setting gap in backplate.

Description

Technical Field

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

[0002] With the widespread application of small-size liquid crystal modules (LCMs) in portable electronic devices and wearable terminals, the precise positioning of optical films within the module has become crucial for ensuring display uniformity and module reliability. In related technologies, to achieve film positioning, a notch is typically created on the side of the backplate, and a lug is provided at the edge of the optical film. The lug engages with the notch in the backplate, and positioning is achieved by the limiting effect of the two end faces of the notch on the edge of the film.

[0003] However, the notch on the back panel disrupts its continuity, making the notch a local stress concentration area. During the long-term operation of the display module, the back panel may be subjected to repeated external mechanical impacts, drop vibrations, or thermal expansion and contraction. Stress accumulation is likely to occur in the notch area, leading to local plastic deformation, cracks, or fractures in the back panel, which in turn affects the assembly accuracy and service life of the display module. Utility Model Content

[0004] This utility model provides a backlight module and display device to block or eliminate cracks generated at the connection between the support plate and the base plate during bending processing, thereby improving the reliability and structural stability of the backlight module.

[0005] To achieve the above functions, the technical solution provided by this utility model embodiment is as follows: This utility model embodiment provides a backlight module, including: Backplate, including the receiving cavity; The frame includes a frame body and a frame extension connected to each other. The frame body surrounds the outer periphery of the back panel, and the frame extension extends from the frame body to the top of the back panel. A positioning groove is provided on the side of the frame extension closest to the back panel. An optical film layer includes an optical film body and a protrusion connected to each other. The optical film body is located within the receiving cavity, and the protrusion is bent away from the optical film body in a direction away from the back plate. At least a portion of the protrusion is disposed within the positioning groove.

[0006] Optionally, in one embodiment, the backlight module further includes an adhesive portion disposed on the side of the frame extension away from the frame body portion, the adhesive portion covering the positioning groove, and the adhesive portion used to fix the frame to the display panel.

[0007] Optionally, in one embodiment, the back plate includes a bottom plate and a plurality of side plates, the plurality of side plates being arranged around the edge of the bottom plate to form the receiving cavity, wherein the side plates are spaced apart from the optical film layer.

[0008] Optionally, in one embodiment, the side plate includes a first sub-plate, a first connecting plate, and a second sub-plate. The first sub-plate is connected to the bottom plate, and the first connecting plate is connected to the first sub-plate and extends in a direction away from the optical film layer to connect to the second sub-plate.

[0009] Optionally, in one embodiment, the distance between the side of the second sub-plate away from the base plate and the side of the base plate near the optical film layer is greater than the distance between the sides of the optical film body away from the base plate and near the optical film layer.

[0010] Optionally, in one embodiment, the positioning groove and the protrusion are spaced apart, and the distance between the positioning groove and the protrusion is greater than or equal to 0.05 mm and less than or equal to 0.15 mm.

[0011] Optionally, in one embodiment, the positioning groove is provided with a guide radius at one end near the base plate.

[0012] Optionally, in one embodiment, a seam is provided at the connection between the optical film body and the protrusion, and the protrusion is bent away from the optical film body along the seam.

[0013] Optionally, in one embodiment, the optical film body includes multiple sides, wherein at least three of the sides are provided with the protrusions, and the number of protrusions on each side is greater than or equal to 1.

[0014] This utility model provides a display device including any of the backlight modules described above.

[0015] The beneficial effects of this utility model embodiment are as follows: This utility model provides a backlight module and a display device. The backlight module includes a back plate, a frame, and an optical film layer. The frame includes a frame body and a frame extension connected to each other. The frame body is disposed around the outer periphery of the back plate, and the frame extension extends from the frame body to the top of the back plate, and a positioning groove is provided on the side near the back plate. The optical film layer includes an optical film body and a protrusion bent and connected to the optical film body. The optical film body is disposed in the receiving cavity of the back plate, and at least part of the protrusion is disposed in the positioning groove. This achieves effective positioning of the optical film layer without opening a notch in the back plate, avoiding the reduction in back plate strength caused by opening a notch in the back plate, and the wear problem caused by the protrusion of the optical film layer due to shaking in the notch in the back plate. This extends the service life of the optical film layer and improves the reliability of the display module. Attached Figure Description

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

[0017] Figure 1 This is a schematic diagram of the backlight module provided in an embodiment of the present utility model; Figure 2 Provided for the embodiments of this utility model Figure 1 A schematic diagram of the cross section corresponding to AA' in the middle; Figure 3 A cross-sectional schematic diagram of the adhesive frame provided in an embodiment of this utility model; Figure 4 Provided for the embodiments of this utility model Figure 1 Enlarged view corresponding to point B in the image; Figure 5 This is a top view schematic diagram of the optical film layer provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the display device provided in an embodiment of the present utility model.

[0018] Explanation of reference numerals in the attached figures: 1-Backlight module; 10-Back panel; 100-Receiving cavity; 11-Base plate; 12-Side plate; 121-First sub-board; 122-First connecting plate; 123-Second sub-board; 20-Light guide plate; 30-Optical film layer; 31-Optical film body; 310-Side; 310A-First side; 310B-Second side; 310C-Third side; 310D-Fourth side; 32-Protrusion; 33-Seam line; 40-Frame; 41-Frame body; 411-First sub-part; 4111-Guide part; 412-First connecting part; 413-Second sub-part; 42-Frame extension; 421-Positioning groove; 4211-Guide rounded corner; 50-Adhesive part; 2-Display device; 21-Display panel. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower in the actual use or working mode of the device, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only, and features specified as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections or connections that allow for communication; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] The following disclosure provides many different embodiments for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, examples of various specific processes and materials are provided, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0023] Please combine Figures 1 to 5 This embodiment provides a backlight module 1, which includes a backplate 10, a light guide plate 20, an optical film layer 30, and a frame 40. The backlight module 1 is used to provide a uniform surface light source for the display panel to ensure the brightness uniformity and display stability of the display module.

[0024] The back plate 10 includes a receiving cavity 100. Specifically, the back plate 10 includes a base plate 11 and a plurality of side plates 12 extending along the edge of the base plate 11. The plurality of side plates 12 are arranged around the periphery of the base plate 11 and are bent and connected to the base plate 11, thereby forming the receiving cavity 100 for mounting the display panel between the base plate 11 and the plurality of side plates 12. The base plate 11 is used to support the light guide plate 20, the optical film layer 30 and related optical elements, and the plurality of side plates 12 are used to surround and define the assembly boundary of the backlight module 1, while providing a fixed support interface for the frame 40.

[0025] It is understood that by employing multiple side plates 12 arranged around the base plate 11, the back plate 10 forms a support structure with a closed frame, which can improve the mechanical strength and deformation resistance of the backlight module 1. Thus, during the handling, assembly and long-term use of the module, displacement, warping or gap changes of the display panel caused by the deformation of the back plate 10 can be effectively prevented, thereby ensuring the stability and display reliability of the display panel and the back plate 10 after assembly.

[0026] The light guide plate 20 is disposed on one side of the base plate 11 and located within the receiving cavity 100. The light guide plate 20 is used to guide, diffuse, and homogenize the light emitted by the light source, so that the display panel obtains uniform backlight illumination, thereby ensuring the brightness consistency and color balance of the displayed image. The light source can be a light strip, which is disposed on the side of the light guide plate 20 and is used to inject light into the interior of the light guide plate 20. Through the cooperation of the light strip and the light guide plate 20, after the light enters the light guide plate 20, it is reflected and scattered multiple times by the internal microstructure or diffusion texture of the light guide plate 20, so that the light flux is uniformly distributed on the light-emitting surface of the light guide plate 20.

[0027] The frame 40 is disposed on the outer periphery of the back plate 10 and surrounds the back plate 10. Specifically, the frame 40 includes a frame body 41 and a frame extension 42 connected to each other. The frame body 41 is disposed along the outer periphery of the back plate 10. The frame extension 42 extends from the frame body 41 toward the top of the back plate 10, and a positioning groove 421 is provided on the side of the frame extension 42 near the back plate 10. The positioning groove 421 is used to limit and position the edge of the optical film layer 30 to ensure that the optical film layer 30 is stable in space after assembly, and to prevent displacement or warping during assembly, transportation and use, thereby ensuring the optical performance and structural reliability of the backlight module 1.

[0028] The optical film layer 30 is disposed on the side of the light guide plate 20 away from the base plate 11. The optical film layer 30 includes multiple optical films, including but not limited to one or more stacked combinations of diffuser sheets, prism sheets and brightness enhancement sheets, to achieve the effects of light diffusion, light focusing and light uniformity, thereby further improving the brightness uniformity of the backlight module 1 and the visual consistency of the display panel.

[0029] Specifically, the optical film layer 30 includes an optical film body 31 and a protrusion 32 connected to each other. The optical film body 31 is located within the receiving cavity 100. The protrusion 32 is bent away from the optical film body 31 in a direction away from the back plate 10, and at least a portion of the protrusion 32 is disposed within the positioning groove 421. Therefore, it is not necessary to open a notch on the back plate 10 for positioning the optical film layer 30, so that the optical film layer 30 can be accurately positioned. This avoids the reduction in the strength of the back plate 10 caused by opening a notch on the back plate 10, and the wear problem caused by the protrusion 32 of the optical film layer 30 due to shaking within the notch of the back plate 10. This extends the service life of the optical film layer 30 and improves the reliability of the display module.

[0030] Furthermore, when the backplate 10 is thin, has rough edges in some areas, or has a large rounded corner transition in the mold, the contact surfaces on both sides of the notch of the backplate 10 may become sharp or uneven, causing the optical film layer 30 to be easily punctured when it shakes laterally or vertically, thereby affecting the light transmission performance, surface integrity, and overall reliability of the display module. In this embodiment, by setting at least a portion of the protrusions 32 in the positioning groove 421 of the frame 40, the protrusions 32 of the optical film layer 30 can be prevented from shaking and causing wear at the notch of the backplate 10, thereby extending the service life of the optical film layer 30 and improving the structural stability and reliability of the backlight module 1.

[0031] Furthermore, a seam line 33 is provided at the connection between the optical film body 31 and the protrusion 32, and the protrusion 32 is bent away from the optical film body 31 along the seam line 33. By providing the seam line 33 at the connection between the optical film body 31 and the protrusion 32, the optical film layer 30 can form a predetermined bending trajectory at the seam line 33 during bending and forming, thereby ensuring that the included angle between the protrusion 32 and the optical film body 31 is consistent and perpendicular.

[0032] Specifically, before installing the optical film layer 30, both the optical film body 31 and the protrusion 32 are arranged laterally (i.e., the extension direction of the optical film body 31 is parallel to the extension direction of the protrusion 32). The optical film layer 30 has the seam 33 reserved, and the protrusion 32 can be bent away from the optical film body 31 along the seam 33 so that the protrusion 32 of the optical film layer 30 can be inserted into the positioning groove 421, thereby improving the fixing strength of the optical film layer 30 without the need for a complicated assembly process.

[0033] Understandably, the seam line 33 acts as a "bending guide line" during the molding process, concentrating bending stress in a preset area and preventing irregular deformation or warping of other parts of the optical film layer 30 due to random bending. This not only improves the molding accuracy and positioning stability of the protrusion 32, but also ensures the consistency of the fit when the protrusion 32 is inserted into the positioning groove 421, reducing assembly deviations and improving the positioning accuracy of the optical film layer 30, thereby enhancing the reliability of the backlight module 1.

[0034] Furthermore, after the optical film layer 30 is assembled, the protrusion 32 of the optical film layer 30 may not remain completely vertical due to pressure or spatial constraints, and may fold to a certain extent within the positioning groove 421. However, since the positioning of the optical film layer 30 mainly relies on the fitting gap between the edge of the protrusion 32 and the positioning groove 421 for limiting, this folding will not affect the actual positioning effect of the optical film layer 30. In other words, even if the protrusion 32 is slightly deviated, the edge of the protrusion 32 can still form a reliable contact limit with the inner wall of the positioning groove 421, thereby maintaining the stable position of the optical film layer 30 and ensuring that the optical performance and assembly accuracy of the backlight module 1 are not affected.

[0035] Furthermore, the optical film body 31 includes multiple sides 310, wherein at least three of the sides 310 are provided with the protrusions 32, and the number of protrusions 32 on each side 310 is greater than or equal to 1, so that the optical film body 31 can be stably positioned in multiple directions to prevent lateral or longitudinal displacement after assembly.

[0036] Specifically, the optical film body 31 includes a first side 310A and a second side 310B disposed opposite to each other along the length direction of the back plate 10, and a third side 310C and a fourth side 310D disposed opposite to each other along the width direction of the back plate 10. The third side 310C and the fourth side 310D are both disposed between the first side 310A and the second side 310B. At least three of the first side 310A, the second side 310B, the third side 310C and the fourth side 310D are provided with the protrusions 32, and the number of protrusions 32 on each side is greater than or equal to 1.

[0037] It is understood that when the backlight module 1 is subjected to assembly stress, thermal expansion and contraction, or external vibration, the protrusions 32 provided in each direction of the optical film body 31 can form multi-point limiting with the positioning grooves 421 of the frame extension 42, thereby effectively preventing the optical film layer 30 from lateral displacement or vertical shaking, and ensuring the stable bonding position of the optical film layer 30 in the backlight module 1.

[0038] Furthermore, the positioning groove 421 is provided with a guide radius 4211 at one end near the base plate 11, which can play a guiding and buffering role during the installation of the optical film layer 30. When the protrusion 32 of the optical film layer 30 is inserted into the positioning groove 421, the guide radius 4211 can guide the protrusion 32 to smoothly enter the positioning groove 421, avoiding jamming, scratching or warping of the film caused by right-angle edges, thereby reducing assembly resistance and improving the smoothness and accuracy of positioning of the optical film layer 30. At the same time, the guide radius 4211 can also disperse local stress during the assembly process, reduce stress concentration at the opening of the positioning groove 421, extend the service life of the frame 40 and improve the reliability of the backlight module 1 assembly.

[0039] Please continue to combine Figures 1 to 5 In one embodiment, the positioning groove 421 and the protrusion 32 are spaced apart, and the distance D1 between the positioning groove 421 and the protrusion 32 is greater than or equal to 0.05 mm and less than or equal to 0.15 mm, so as to ensure that the protrusion 32 can obtain a reliable limiting effect after being inserted into the positioning groove 421.

[0040] Specifically, when the distance D1 between the positioning groove 421 and the protrusion 32 is less than 0.05 mm, the protrusion 32 of the optical film layer 30 may be subjected to excessive frictional resistance or stress concentration during the insertion process, resulting in edge curling, folding, or surface scratches, thereby affecting the light transmission performance and flatness of the optical film layer 30; when the distance D1 between the positioning groove 421 and the protrusion 32 is greater than 0.15 mm, the constraint force of the protrusion 32 in the positioning groove 421 is insufficient, which may cause shaking, displacement, or loosening, thereby affecting the positioning accuracy and stacking stability of the optical film layer 30.

[0041] It is understood that by setting the distance D1 between the positioning groove 421 and the protrusion 32 to be greater than or equal to 0.05 mm and less than or equal to 0.15 mm, the protrusion 32 of the optical film layer 30 is ensured to achieve precise positioning and stable limiting after being inserted into the positioning groove 421 of the frame 40. At the same time, the positioning groove 421 and the protrusion 32 are spaced apart, which can also absorb the small deformation caused by changes in ambient temperature or stress transmission, thereby avoiding displacement or stress damage to the optical film layer 30 during thermal expansion and contraction or long-term use, and improving the assembly reliability of the backlight module 1.

[0042] Furthermore, the size W1 of the protrusion 32 is less than or equal to 0.05 mm, thereby reducing the opening size of the positioning groove 421 of the frame 40, and while maintaining sufficient positioning accuracy, avoiding local weakening of the frame 40 due to excessively large opening size of the positioning groove 421.

[0043] Specifically, when the size W1 of the protrusion 32 is greater than 0.05 mm, in order to accommodate the protrusion 32, the opening size of the positioning groove 421 needs to be increased accordingly, thereby weakening the strength of the frame extension 42, making it prone to local deformation during assembly or under pressure, affecting the structural stability of the backlight module 1; at the same time, when the size W1 of the protrusion 32 is too large, it will also occupy the bonding space between the frame 40 and the display panel, which is not conducive to the bonding between the display panel and the frame 40, increasing the difficulty of bonding the adhesive part 50 and potentially causing problems such as bubbles and edge lifting.

[0044] It is understood that by setting the size W1 of the protrusion 32 to be less than or equal to 0.05 mm, this embodiment can ensure the positioning of the optical film layer 30 while maintaining the strength and rigidity of the frame 40. It also provides sufficient attachment space for the adhesive part 50, so that the adhesive part 50 can be flatly attached to the surface of the frame extension 42, thereby preventing the edge of the display panel from lifting or light leakage.

[0045] It should be noted that the dimension W1 of the protrusion 32 refers to the dimension along the plane of the optical film layer 30, including the length of the protrusion 32 parallel to the long side of the optical film layer 30 and the length of the protrusion 32 parallel to the short side of the optical film layer 30, which is used to define the lateral assembly gap of the optical film layer 30 in the positioning groove 421.

[0046] Please continue to combine Figures 1 to 5 In one embodiment, the backlight module 1 further includes an adhesive portion 50, which is disposed on the side of the frame extension 42 away from the frame body 41. The adhesive portion 50 covers the positioning groove 421 and is used to fix the frame 40 to the display panel. By covering the positioning groove 421 with the adhesive portion 50, the positioning groove 421 forms a closed structure after assembly, further improving the sealing performance and overall structural stability of the backlight module 1. The adhesive portion 50 includes, but is not limited to, light-shielding tape or double-sided tape.

[0047] It should be noted that in related technologies, to achieve the positioning of the optical film layer 30, a notch is typically required in the backplate 10 to allow the mounting ears of the optical film to be inserted and positioned. However, the notch in the backplate 10 not only weakens the structural integrity of the backlight cavity but may also cause light leakage, affecting display uniformity. Furthermore, the notch becomes a channel for moisture or dust to enter, posing a potential reliability hazard. To prevent light leakage and dust ingress, related technologies typically apply black Mylar tape or light-shielding tape to the notch for light blocking and sealing. However, this method not only increases material consumption but also requires additional application steps, leading to increased assembly costs.

[0048] It is understood that in this embodiment, by forming a positioning groove 421 on the extension portion 42 of the frame, the protrusion 32 of the optical film layer 30 is inserted into the positioning groove 421 to achieve the positioning of the optical film layer 30, so that the back plate 10 does not need to have a notch, thereby avoiding the light leakage problem caused by the notch of the back plate 10; at the same time, since the adhesive portion 50 covers the positioning groove 421, the positioning groove 421 forms a closed structure after assembly, which can effectively prevent moisture and dust from entering through the notch path, thereby improving the dustproof and waterproof performance and long-term reliability of the backlight module 1.

[0049] Furthermore, since the positioning groove 421 forms a closed structure after assembly, there is no need to apply additional black Mylar tape or light-blocking tape, which reduces the amount of materials used and the manual bonding process. This effectively reduces manufacturing costs and assembly complexity while ensuring the reliability of the backlight module 1.

[0050] Please continue to combine Figures 1 to 5In one embodiment, the orthographic projection of the optical film layer 30 on the base plate 11 is located within the base plate 11, and the side plate 12 is spaced apart from the optical film layer 30 so as to provide sufficient assembly space for the optical film layer 30 during the assembly of the backlight module 1, and to reserve buffer space for the thermal expansion of the optical film layer 30 when the backlight module 1 is running or the ambient temperature changes, thereby avoiding problems such as warping, wrinkling or stress concentration of the optical film due to space constraints, and ensuring the flatness and optical performance stability of the optical film layer 30 under long-term operation.

[0051] Specifically, the side plate 12 includes a first sub-plate 121, a first connecting plate 122, and a second sub-plate 123 connected in sequence; the first sub-plate 121 is connected to the bottom plate 11 and is used to support and define the bottom boundary of the backlight module 1; the first connecting plate 122 is connected to one side of the first sub-plate 121 and extends obliquely or bently in a direction away from the optical film layer 30, and is used to form a transition section in the back plate 10, thereby increasing the structural strength without increasing the thickness of the backlight module 1; the second sub-plate 123 is connected to one end of the first connecting plate 122 away from the bottom plate 11 and extends in a direction away from the optical film layer 30, and is used to form a vertical reinforcement section on the outer edge of the back plate 10.

[0052] It is understood that by extending the second sub-plate 123 in a direction away from the optical film layer 30, the side plate 12 forms an outward convex structure near the edge of the optical film layer 30. This not only effectively improves the bending stiffness and structural stability of the side plate 12, but also forms an assembly gap between the side plate 12 and the optical film layer 30, reducing direct friction and interference between the edge of the optical film layer 30 and the side plate 12. When the backlight module 1 is subjected to external force, temperature change, or assembly error, the optical film layer 30 can achieve slight displacement or thermal expansion compensation within the assembly gap, thereby preventing the edge of the optical film layer 30 from being squeezed, scratched, or warped, and ensuring its light transmission performance and surface integrity.

[0053] Furthermore, the frame body 41 includes a first sub-part 411, a first connecting part 412, and a second sub-part 413. The first sub-part 411 is connected to the frame extension 42. The first connecting part 412 is connected between the first sub-part 411 and the second sub-part 413, and the first connecting part 412 extends in a direction away from the optical film layer 30. The extension direction of the first connecting part 412 is parallel to the extension direction of the first connecting plate 122, thereby ensuring that the extension direction of the frame body 41 is consistent with the extension direction of the side plate 12, avoiding interference between the frame 40 and the back plate 10, and ensuring smooth assembly.

[0054] In practical applications, small-sized display modules usually require a higher screen-to-body ratio. In order to maximize the display area ratio, the border area enclosed by the back plate and the frame is compressed in the planar direction. As a result, the effective width that can be used for the arrangement of various structural components is limited, making it difficult to simultaneously meet the functional requirements of positioning the optical film and attaching the frame.

[0055] To address the aforementioned space constraint issue, this embodiment extends the first connecting portion 412 in a direction away from the optical film layer 30 and keeps it parallel to the extension direction of the first connecting plate 122, thereby creating a clearance space between the first connecting portion 412 and the back plate 10. This improves the space utilization rate of the edge area of ​​the backlight module 1, while also alleviating spatial conflicts between structural components and enhancing the assembly adaptability and structural compactness of the small-sized display module.

[0056] Furthermore, to facilitate the assembly between the frame 40 and the back plate 10, a guide portion 4111 is provided on the side of the first sub-part 411 near the side plate 12. The guide portion 4111 has a rounded or chamfered structure and is used to guide the side plate 12 during the assembly of the frame 40 to the back plate 10, so that the frame 40 can be smoothly positioned and attached to the outer periphery of the back plate 10 in a predetermined direction. This avoids jamming, scratching or misalignment between the edge of the frame 40 and the side plate 12 of the back plate 10 during the assembly process, thereby reducing the assembly resistance of the component.

[0057] Please continue to combine Figures 1 to 5 In one embodiment, the distance H1 between the side of the second sub-plate 123 away from the base plate 11 and the side of the base plate 11 near the optical film layer 30 is greater than the distance H2 between the side of the optical film body 31 away from the back plate 10 and the side of the base plate 11 near the optical film layer 30. This results in the second sub-plate 123 forming a local limiting structure on both sides of the assembly position of the optical film layer 30, which is used to limit the lateral displacement of the optical film layer 30 before the initial placement of the optical film layer 30 and before the installation of the frame 40.

[0058] It should be noted that the lateral displacement refers to the displacement of the optical film layer 30 along the plane of the base plate 11 (parallel to the long or short side of the base plate 11); before the adhesive frame 40 is installed, the optical film layer 30 has not been fixed by the positioning groove 421, so it is easy to sway left and right during the assembly process due to gravity, airflow or operation deviation, resulting in the edge position deviation of the optical film layer 30, which in turn affects the subsequent bonding accuracy of the adhesive frame 40.

[0059] It is understood that in this embodiment, by setting the distance H1 between the side of the second sub-plate 123 away from the base plate 11 and the side of the base plate 11 near the optical film layer 30 to be greater than the distance H2 between the side of the optical film body 31 away from the back plate 10 and the side of the base plate 11 near the optical film layer 30, the height of the second sub-plate 123 is increased, so that the second sub-plate 123 forms a limiting effect on the edge of the optical film layer 30. This allows for preliminary constraint on the position of the optical film layer 30 without affecting its assembly, preventing slippage or displacement during assembly. This improves the stability and assembly consistency of the optical film layer 30 during the pre-assembly stage, while also reducing manual adjustment time and improving assembly efficiency and yield.

[0060] Please combine Figure 1 , Figure 2 and Figure 6 This embodiment also provides a display device 2, which includes a display panel 21 and the backlight module 1 described in any of the above embodiments; wherein the display panel 21 may be a liquid crystal display panel.

[0061] The display panel 21 is bonded and fixed to the frame 40 of the backlight module 1 by the adhesive part 50, thereby ensuring the optical bonding accuracy and realizing a stable connection between the display panel 21 and the backlight module 1, preventing displacement or delamination of the two in transportation, drop or temperature and humidity change environment, thereby improving the reliability and assembly consistency of the display device 2.

[0062] It is understood that the backlight module 1 has been described in detail in the above embodiments and will not be described again here; in particular, since the display device 2 adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0063] In specific applications, the display device 2 can be at least one of the following devices with display functions: smartphone, tablet computer, mobile phone, video phone, e-book reader, desktop computer, laptop computer, netbook, workstation, server, personal digital assistant, portable media player, MP3 player, mobile medical device, camera, game console, digital camera, car navigation system, electronic billboard, ATM or wearable device.

[0064] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0065] The foregoing has provided a detailed description of a backlight module and display device provided by the embodiments of this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this utility model. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A backlight module, characterized in that, include: Backplate, including the receiving cavity; The frame includes a frame body and a frame extension connected to each other. The frame body surrounds the outer periphery of the back panel, and the frame extension extends from the frame body to the top of the back panel. A positioning groove is provided on the side of the frame extension closest to the back panel. An optical film layer includes an optical film body and a protrusion connected to each other. The optical film body is located within the receiving cavity, and the protrusion is bent away from the optical film body in a direction away from the back plate. At least a portion of the protrusion is disposed within the positioning groove.

2. The backlight module according to claim 1, characterized in that, The backlight module also includes an adhesive portion, which is located on the side of the frame extension away from the frame body. The adhesive portion covers the positioning groove and is used to fix the frame to the display panel.

3. The backlight module according to claim 1, characterized in that, The back plate includes a base plate and a plurality of side plates, the plurality of side plates being arranged around the edge of the base plate to form the receiving cavity, wherein the side plates are spaced apart from the optical film layer.

4. The backlight module according to claim 3, characterized in that, The side plate includes a first sub-plate, a first connecting plate, and a second sub-plate. The first sub-plate is connected to the bottom plate, and the first connecting plate is connected to the first sub-plate and extends away from the optical film layer to connect to the second sub-plate.

5. The backlight module according to claim 4, characterized in that, The distance between the side of the second sub-plate away from the base plate and the side of the base plate near the optical film layer is greater than the distance between the sides of the optical film body away from the base plate and near the optical film layer.

6. The backlight module according to any one of claims 1 to 5, characterized in that, The positioning groove is spaced apart from the protrusion, and the distance between the positioning groove and the protrusion is greater than or equal to 0.05 mm and less than or equal to 0.15 mm.

7. The backlight module according to any one of claims 1 to 5, characterized in that, The positioning groove has a guide radius at one end near the base plate.

8. The backlight module according to any one of claims 1 to 5, characterized in that, The connection between the optical film body and the protrusion is provided with a seam, and the protrusion bends away from the optical film body along the seam.

9. The backlight module according to any one of claims 1 to 5, characterized in that, The optical film body includes multiple sides, wherein at least three of the sides are provided with the protrusions, and the number of protrusions on each side is greater than or equal to 1.

10. A display device, characterized in that, Includes the backlight module as described in any one of claims 1 to 9.

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