Back frame structure for display panel and display device

Abstract

The present disclosure provides a back frame structure for a display panel and a display device. The back frame structure comprises a back plate, a middle frame and an outer frame. The back plate has a bottom surface and a sidewall surrounding the bottom surface to define a containing space. The middle frame has a clamping unit located on a side of the sidewall away from the containing space. The clamping unit is configured to be deformed under an external force. The outer frame is located on a side of the middle frame away from the sidewall, and the outer frame and the clamping unit are clamped. Thus, the back frame structure can be conveniently and quickly disassembled through the deformation of the clamping unit, thereby reducing manufacturing costs, improving assembly efficiency, and having good stability and use effect.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more particularly to a back frame structure for a display panel and a display device. Background Technology

[0002] Currently, displays are increasingly widely used in people's daily lives. With the growing demand for large-screen monitoring, outdoor displays, and other ultra-large displays, video wall displays have become a major way to achieve ultra-large screens. Common LCD video wall displays can be used individually as monitors or combined to create ultra-large screens. To improve the display effect of ultra-large screens, video wall displays are typically required to have narrow bezels, good display performance and stability, and narrow seams between multiple displays. Most LCD displays include an outer bezel structure, which serves to prevent light leakage through narrow seams and enhance the stability of the display.

[0003] However, the current back frame structure and display devices used for display panels still need improvement. Summary of the Invention

[0004] This disclosure provides a back frame structure and display device for a display panel to solve or alleviate one or more technical problems in the related art.

[0005] As a first aspect of the present disclosure, the present disclosure provides a back frame structure for a display panel, comprising: a back plate having a bottom surface and a side wall surrounding the bottom surface to define an accommodating space; a middle frame having a snap-fit ​​unit located on the side wall away from the accommodating space, the snap-fit ​​unit being configured to deform under external force; and an outer frame located on the side of the middle frame away from the side wall, the outer frame being snapped into place with the snap-fit ​​unit.

[0006] In one embodiment, along a direction perpendicular to the bottom surface, the snap-fit ​​unit includes a first protrusion, a groove, and a second protrusion arranged in sequence, the first protrusion and the second protrusion being configured to deform along directions toward and away from the groove, and the outer frame being snapped in place by the first protrusion and the second protrusion.

[0007] In one embodiment, the material forming the middle frame includes plastic, and the middle frame is formed by injection molding.

[0008] In one embodiment, along a direction perpendicular to the bottom surface, the outer frame includes a plurality of spaced sub-outer frame units. Each sub-outer frame unit includes a main body, a connecting part, and a snap-fit ​​part. The connecting part is located at both ends of the main body. The snap-fit ​​part and the connecting part are connected to the side of the main body that is not connected to the main body. The snap-fit ​​part snaps onto the side of the first protrusion away from the groove, or the snap-fit ​​part snaps onto the side of the second protrusion away from the groove.

[0009] In one embodiment, the outer frame covers a portion of the middle frame structure and exposes the snap-fit ​​unit. In the direction from the sidewall to the outer frame, there is a step difference of 0.2-0.3 mm between the outer frame and the sidewall at their furthest point and between the snap-fit ​​unit and the sidewall at their furthest point.

[0010] In one embodiment, the first protrusion and the second protrusion have a chamfer on the side away from the groove.

[0011] In one embodiment, the bottom surface of the back panel is quadrilateral, and the middle frame includes a plurality of snap-fit ​​units along the direction extending along the side length of the quadrilateral, with the distance between two adjacent snap-fit ​​units being 5-20 cm.

[0012] In one embodiment, the material forming the outer frame includes metal, and the thickness of the outer frame is 0.2-0.4 mm.

[0013] As a second aspect of this disclosure, a display device is provided, comprising a back frame structure as described in any of the preceding claims; a backlight module disposed on one side of the back panel and located within a receiving space of the back frame structure; and a display panel disposed on the side of the backlight module away from the back panel.

[0014] In one embodiment, the display device is a splicing display device.

[0015] The above overview is for illustrative purposes only and is not intended to be limiting in any way. Further aspects, embodiments, and features of this disclosure will become readily apparent from the accompanying drawings and the following detailed description, in addition to the illustrative aspects, embodiments, and features described above. Attached Figure Description

[0016] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments according to this disclosure and should not be construed as limiting the scope of this disclosure.

[0017] Figure 1This is a partial cross-sectional structural diagram of a back frame structure according to an embodiment of the present disclosure;

[0018] Figure 2 This is a partial cross-sectional structural diagram of the assembly process of the outer frame and middle frame of the back frame structure in the related technology;

[0019] Figure 3 This is a partial cross-sectional structural diagram of a back frame structure according to another embodiment of the present disclosure;

[0020] Figure 4 This is a partial cross-sectional structural diagram illustrating the assembly process of the outer frame and middle frame of a back frame structure according to an embodiment of the present disclosure;

[0021] Figure 5 A partial cross-sectional structural diagram of the disassembly process of the outer frame and middle frame of the back frame structure according to an embodiment of the present disclosure;

[0022] Figure 6 for Figure 4 A partially enlarged schematic diagram of the mid-back frame structure;

[0023] Figure 7 This is a schematic diagram of the structure of a display device according to an embodiment of the present disclosure;

[0024] Figure 8 This is a schematic diagram of a back frame structure according to an embodiment of the present disclosure.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1000: Back frame structure; 100: Back panel; 110: Bottom surface; 120: Side wall; 130: Accommodation space; 200: Middle frame; 210: Snap-fit ​​unit; 10: First protrusion; 20: Groove; 30: Second protrusion; 300: Outer frame; 310: Sub-outer frame unit; 40: Main body; 50: Connecting part; 60: Snap-fit ​​part; 70: Screw; 80: Light-shielding adhesive; 2000: Backlight module; 2100: Film material; 2200: Diffuser plate; 3000: Display panel; 4000: Display device. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure, and different embodiments can be combined arbitrarily without conflict. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0028] In a first aspect of this disclosure, a back frame structure for a display panel is provided, specifically, with reference to... Figure 1The back frame structure 1000 includes a back plate 100, a middle frame 200, and an outer frame 300. The back plate 100 has a bottom surface 110 and side walls 120 surrounding the bottom surface 110 to define an accommodating space 130. The middle frame 200 has a snap-fit ​​unit 210 located on the side wall 120 away from the accommodating space 130, and the snap-fit ​​unit 210 is configured to deform under external force. The outer frame 300 is located on the side of the middle frame 200 away from the side wall 120, and the outer frame 300 and the snap-fit ​​unit 210 snap together. Therefore, the outer frame 300 and the middle frame 200 of the back frame structure 1000 can be easily and quickly snapped together by the deformation of the snap-fit ​​unit 210, allowing for the assembly and disassembly of the outer frame 300. This structure reduces manufacturing costs, improves assembly efficiency, and provides good stability and usability.

[0029] To facilitate understanding, the principle behind the back frame structure's ability to achieve the aforementioned beneficial effects will be briefly explained below:

[0030] Most current display panels include an outer frame, which serves both to prevent light leakage through slits and to enhance the stability of the display screen. (Reference) Figure 2 In existing technologies, the outer frame and middle frame of the back frame structure are fixed by a large number of screws (see reference). Figure 2 The screws (70 in the original text) require at least two people (one to hold and one to lock) to fasten, resulting in low efficiency. Furthermore, when the display panel using this back frame structure is large, such as a splicing display panel, the number of screws required is even greater; for example, a typical splicing display panel requires at least 50 screws, and a 55-inch display panel requires approximately 100 screws. Screw fastening is inefficient, leading to higher labor and material costs for the display panel. Based on these problems, the inventors of this application, through in-depth research, have cleverly designed the structure of the middle frame. A snap-fit ​​unit is provided on the side of the middle frame away from the back panel's accommodating space. This snap-fit ​​unit can deform under external force. Therefore, through the deformation of the snap-fit ​​unit, the outer frame and middle frame can be easily and quickly assembled and disassembled, improving assembly efficiency, eliminating the use of screws, and reducing labor and material costs in display panel manufacturing, thus achieving cost reduction and efficiency improvement. Moreover, this back frame structure has good stability and excellent performance.

[0031] In some embodiments of this application, the material forming the backplate 100 may include metal, such as stainless steel. Therefore, the metal material has high strength, and when the back frame structure 1000 is used in a display panel, it provides good support and protection.

[0032] In some embodiments of this application, the material forming the middle frame 200 may include plastic. Therefore, the plastic material has good flexibility, and the snap-fit ​​unit 210 also has good flexibility, allowing for deformation, facilitating the snap-fit ​​between the outer frame 300 and the snap-fit ​​unit 210, and providing good stability after snap-fit. Specifically, the middle frame 200 may be formed by injection molding. As those skilled in the art know, the middle frame 200 has various concave and convex structures to achieve the connection between the outer frame 300 and the back panel 100, and to provide support and restraint for components within the accommodating space 130, such as... Figure 1 The portion shown extends from the top of the sidewall 120 into the receiving space 130 and contacts the bottom surface 110. This allows for the definition of a step at the top of the sidewall to accommodate structures such as the film material for the backlight module. Therefore, by using injection molding to form the middle frame 200, it is relatively easy to design the injection mold and achieve the molding of various complex structures. Furthermore, since the middle frame 200 is relatively thin (along the direction extending parallel to the bottom surface 110), the injection mold can be opened relatively easily by upper and lower mold closing, thus avoiding difficulties in mold opening due to the complex molding space structure within the mold. Therefore, the middle frame 200 with the snap-fit ​​unit 210 can be easily formed in a single injection molding process without adding an additional manufacturing process for the snap-fit ​​unit 210, eliminating the need for screws used for fixing in the prior art, reducing the production cost of the back frame structure 1000, and improving production efficiency. The specific material used to form the middle frame 200 is not particularly limited; for example, a thermoplastic polymer material with certain mechanical properties can be used. Therefore, the middle frame 200 with the above structure can be easily obtained by injection molding.

[0033] In some embodiments of this application, reference is made to Figure 1 The middle frame 200 and the back plate 100 can be tightly fixed by a conventional open hook to ensure the stability of the middle frame in the direction perpendicular to the bottom surface 110. The plastic material thickness can be increased at the inner cavity of the middle frame 200, that is, at the position where it contacts the side wall 120, so that the side wall 120 of the back plate 100 is stuck at the thick plastic position to ensure the stability of the middle frame in the direction parallel to the bottom surface 110.

[0034] In some embodiments of this application, reference is made to Figure 3Along the direction perpendicular to the plane of the bottom surface 110, i.e., in the direction extending from the side wall 120, the snap-fit ​​unit 210 may include a first protrusion 10, a groove 20, and a second protrusion 30 arranged sequentially. The first protrusion 10 and the second protrusion 30 can deform along the directions toward and away from the groove 20, thereby allowing the outer frame 300 to be snapped in place by the first protrusion 10 and the second protrusion 30. The groove 20 provides deformation space for the first protrusion 10 and the second protrusion 30, which can easily achieve the snap-fit ​​between the outer frame 300 and the middle frame 200, making disassembly and assembly convenient, with high assembly efficiency and good stability. For example, in a specific embodiment, the portion where the first and second protrusions and the outer frame 300 snap together may also have a protruding structure, that is, the outer frame 300 snaps into the lower edge of the protrusion on the side of the first and second protrusions away from the groove 20. Since the middle frame 200 can be formed of plastic material, it has a certain amount of deformation. Therefore, when the outer frame 300 and the middle frame 200 are engaged, the outer frame 300 can move along the outer edges of the first and second protrusions under external force. Since the first and second protrusions have protrusions on the side away from the groove 20, when the outer frame 300 moves to the position of the protrusion, the first and second protrusions deform simultaneously towards the groove 20. When the outer frame 300 moves to the lower edge of the protrusion, the engagement is completed, the first and second protrusions return to their initial positions, and the groove 30 also returns to its initial shape. At this time, due to the limiting effect of the protrusions, the outer frame 300 is fixed at the engagement position.

[0035] According to embodiments of this disclosure, the shape of the groove 30 is not particularly limited, as long as it can achieve the aforementioned function and provide space for deformation of the first and second protrusions. For example, the cross-section of the groove 30 can be rectangular, V-shaped, inverted trapezoidal, circular, elliptical, etc., as long as it can provide space for deformation of the first protrusion 10 and the second protrusion 30. Those skilled in the art will understand that the groove 30 has an opening; therefore, the phrase "the cross-section is circular or elliptical" should be interpreted broadly, meaning that the cross-section of the inner wall of the groove is a circle and / or a portion of an ellipse, rather than a closed shape. In some embodiments, the cross-section of the inner wall of the groove can also be a centrally symmetrical shape. For example, the bottom surface of the groove can be arc-shaped, and the sidewalls of the groove can be a straight structure.

[0036] In some embodiments of this application, the material forming the outer frame 300 is not particularly limited, and those skilled in the art can choose familiar materials to form the outer shell 300. For example, according to some specific embodiments, the material forming the outer shell 300 may include metal, such as stainless steel. Therefore, the outer frame 300 has good support and protection performance, is not easily deformed, and has good processing performance, allowing for the formation of a thinner, more mechanically strong outer shell 300. Specifically, the thickness of the outer frame 300 can be 0.2-0.4 mm, for example, 0.22 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.38 mm, etc. Thus, an outer frame 300 with this thickness has both good support strength and is relatively thin, which is beneficial for narrow bezel designs. Especially when used for splicing display panels, the thinner outer frame 300 results in narrower seams in the spliced ​​display panels, leading to better splicing effect and display performance.

[0037] In some embodiments of this application, reference is made to Figure 3 Along a direction perpendicular to the bottom surface 110, the outer frame 300 may include a plurality of spaced-apart sub-frame units 310. Each sub-frame unit 310 may include a main body 40, a connecting portion 50, and a snap-fit ​​portion 60. The connecting portion 50 may be located at both ends of the main body 40, and the snap-fit ​​portion 60 is connected to the side of the connecting portion 50 not connected to the main body 40. Each sub-frame unit 310 may have one or two snap-fit ​​portions 60 to achieve snap-fit ​​with the middle frame 200. For example, Figure 3 The sub-frame unit 310 shown in the middle has two snap-fit ​​portions 60, while the sub-frame units 310 at the upper and lower positions may have only one snap-fit ​​portion 60. The snap-fit ​​portion 60 can snap onto the side of the first protrusion 10 away from the groove 20, and onto the side of the second protrusion 30 away from the groove 20. Specifically, refer to... Figure 4 In the snap-fit ​​unit 210, the groove 20 provides deformation space for the first protrusion 10 and the second protrusion 30. When the outer frame 300 and the snap-fit ​​unit 210 are snapped together, the snap-fit ​​part 60 can easily snap onto the side of the first protrusion 10 away from the groove 20 and / or the side of the second protrusion 30 away from the groove 20. Therefore, the outer frame 300 and the snap-fit ​​unit 210 are snapped together tightly and have good stability. When disassembly is required, refer to... Figure 5 Pinch the first protrusion 10 and the second protrusion 30 together along the direction toward the groove 20 (i.e., along...). Figure 5 By following the arrow direction in the diagram, the outer frame 300 can be easily removed.

[0038] In some embodiments of this application, reference is made to Figure 6 ( Figure 6 for Figure 4(Enlarged view within the dashed circle in (b)) shows that the outer frame 300 can cover part of the structure of the middle frame 200 and expose the snap-fit ​​unit 210. In the direction from the side wall 120 to the outer frame 300, there can be a step difference 'a' between the outer frame 300 and the side wall 120 at their furthest points, and between the snap-fit ​​unit 210 and the side wall 120 at their furthest points. Therefore, when the outer frame 300 and the snap-fit ​​unit 210 are snapped together, the snap-fit ​​unit 210 will not protrude relative to the outer frame 300 in the direction away from the side wall 120, thus affecting the appearance and aesthetics of the display panel using this back frame structure 1000. Especially when this back frame structure 1000 is used to splice display panels, the snap-fit ​​unit 210 will not protrude relative to the outer frame 300 in the direction away from the side wall 120, resulting in smaller seams between the spliced ​​display panels and better display and appearance performance. It should be noted that, through in-depth research, the inventors discovered that, due to some precision errors in the processing of the back panel 100, the middle frame 200, and the outer frame 300, if a step difference a is not reserved in advance during the actual assembly process, the snap-fit ​​unit 210 (especially the protruding parts of the first protrusion 10 and the second protrusion 30) may protrude relative to the outer frame 300 in a direction away from the side wall 120. In the splicing display panel, this protruding part will cause uneven splicing, resulting in excessively large seams, which will affect the splicing effect and display performance. Specifically, based on the aforementioned potential processing errors, the inventors determined that the specific value of the step difference 'a' can be 0.2-0.3 mm, for example, 0.22 mm, 0.25 mm, 0.27 mm, 0.29 mm, etc. Thus, when the value of the step difference 'a' is within this range, it can effectively solve the problem that the splicing unit 210 may protrude relative to the outer frame 300 in the direction away from the side wall 120 due to the aforementioned processing accuracy errors, without causing the distance between the outer frame 300 and the middle frame 200 to be too far or the border to be too large, thereby improving the appearance and display effect of the display panel using this back frame structure.

[0039] In some embodiments of this application, reference is made to Figure 6 The first protrusion 10 and the second protrusion 30 may have a chamfer on the side away from the groove 20. Therefore, the chamfer design has a better smoothing and buffering effect, which can better avoid damage to the structure of the first protrusion 10 and the second protrusion 30 due to friction during the snap-fit ​​process of the outer frame 300 and the snap-fit ​​unit 210.

[0040] In some embodiments of this application, the bottom surface 110 of the back plate 100 can be quadrilateral, see reference. Figure 8 Along the direction extending along the side length of the quadrilateral ( Figure 8As shown in the horizontal direction, the middle frame 200 may include multiple snap-fit ​​units 210. Therefore, the multiple snap-fit ​​units 210 can better secure the outer frame 300, improving the stability of the back frame structure 1000. Specifically, the distance between two adjacent snap-fit ​​units 210 can be 5-20cm, for example, 6cm, 8cm, 10cm, 13cm, 15cm, 17cm, 19cm, etc. Thus, when the distance between two adjacent snap-fit ​​units 210 is within the above range, the multiple snap-fit ​​units 210 can better secure the outer frame 300, improving the stability of the back frame structure 1000, while minimizing the number of snap-fit ​​units 210 and improving the efficiency of assembly and disassembly.

[0041] In another aspect of this disclosure, a display device is provided, specifically referring to... Figure 7 The display device 4000 includes: a back frame structure 1000 as described in any of the preceding claims, a backlight module 2000, and a display panel 3000. The backlight module 3000 is disposed on one side of the back panel 100 and within the receiving space 130 of the back frame structure 1000; the display panel 3000 is disposed on the side of the backlight module 2000 away from the back panel 100. Therefore, the display device possesses all the features and advantages of the aforementioned back frame structure for the display panel. In general, the display device has lower production costs and better display performance.

[0042] In some embodiments of this application, the display device 4000 can be a splicing display device, specifically, a large-size (typically 46-inch or 55-inch) ultra-narrow bezel splicing display device, etc. Therefore, the splicing display device with the aforementioned back frame structure has convenient and quick assembly of its outer and middle frames, lower manufacturing costs, higher assembly efficiency, better stability, and better splicing effect and display performance.

[0043] In some embodiments of this application, reference is made to Figure 7 The display panel 3000 can be a liquid crystal display panel; specifically, from the direction of the display panel 3000 toward the bottom surface 110, the backlight module 2000 can sequentially include a film material 2100 and a diffuser plate 2200, etc., and the light source (not shown in the figure) is disposed in the receiving space between the diffuser plate 2200 and the bottom surface 110. The film material 2100 can include an anti-reflection film, a masking film, etc., and the diffuser plate 2200 can make the light incident on the display panel 3000 more uniform.

[0044] In some embodiments of this application, reference is made to Figure 7A portion of the outer frame 300 covers the display panel 3000, and a light-shielding adhesive 80 is provided between the outer frame 300 and the display panel 3000 to ensure that even if the frame 300 moves in a direction perpendicular to the bottom surface 100 after the frame 300 is assembled, it is not easy to cause light leakage around the slits of the display device 4000, which further improves the display performance of the display device 4000.

[0045] In the description of this specification, it should be understood that the terms "center," "thickness," "upper," "lower," "front," "rear," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "multiple" means two or more, unless otherwise explicitly specified.

[0047] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0048] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this disclosure. To simplify this disclosure, the components and arrangements of specific examples are described above. Of course, these are merely examples and are not intended to limit this disclosure. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0050] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this disclosure, and these should all be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A back frame structure for a display panel, characterized in that, include: A back panel having a bottom surface and sidewalls surrounding the bottom surface to define an accommodating space; The middle frame has a snap-fit ​​unit located on the side wall away from the receiving space, and the snap-fit ​​unit is configured to deform under external force. The outer frame is located on the side of the middle frame away from the side wall, and the outer frame is snapped into the snap-fit ​​unit; The snap-fit ​​unit includes a first protrusion, a groove, and a second protrusion arranged in sequence along a direction perpendicular to the bottom surface. The first protrusion and the second protrusion are configured to deform along directions toward and away from the groove, and the outer frame is snapped in place by the first protrusion and the second protrusion.

2. The back frame structure according to claim 1, characterized in that, The material forming the middle frame includes plastic, and the middle frame is formed by injection molding.

3. The back frame structure according to claim 1, characterized in that, Along a direction perpendicular to the bottom surface, the outer frame includes a plurality of spaced sub-outer frame units. Each sub-outer frame unit includes a main body, a connecting part, and a snap-fit ​​part. The connecting part is located at both ends of the main body. The snap-fit ​​part and the connecting part are connected to the side of the main body that is not connected to the main body. The snap-fit ​​part snaps onto the side of the first protrusion away from the groove, or the snap-fit ​​part snaps onto the side of the second protrusion away from the groove.

4. The back frame structure according to claim 3, characterized in that, The outer frame covers part of the structure of the middle frame and exposes the snap-fit ​​unit. In the direction from the side wall to the outer frame, there is a step difference between the outer frame at its furthest point from the side wall and the snap-fit ​​unit at its furthest point from the side wall, and the step difference is 0.2-0.3mm.

5. The back frame structure according to claim 1, characterized in that, The first protrusion and the second protrusion have a chamfer on the side away from the groove.

6. The back frame structure according to any one of claims 1-5, characterized in that, The bottom surface of the back panel is quadrilateral. Along the direction extending along the side length of the quadrilateral, the middle frame includes multiple snap-fit ​​units, and the distance between two adjacent snap-fit ​​units is 5-20cm.

7. The back frame structure according to claim 1, characterized in that, The material forming the outer frame includes metal, and the thickness of the outer frame is 0.2-0.4 mm.

8. A display device, characterized in that, include: The back frame structure according to any one of claims 1-7; A backlight module, wherein the backlight module is disposed on one side of the back panel and located within the receiving space of the back frame structure; The display panel is disposed on the side of the backlight module away from the back panel.

9. The display device according to claim 8, characterized in that, The display device is a splicing display device.

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