Frameless backboard structure and display device

Abstract

The utility model relates to the technical field of display equipment, and provides a frameless backboard structure and a display device.According to the frameless backboard structure, connection of a backboard and a middle frame is achieved through cooperation of a positioning hole set and a positioning column, compared with an existing connection mode that the backboard is embedded into the middle frame, the exposed area of the middle frame can be greatly reduced, the frameless design of the backboard is achieved, and the display quality is improved. The user experience is improved; the first positioning holes and the positioning columns matched with the first positioning holes are positioned in the vertical direction of the first direction, and are not positioned in the first direction, so that the positioning columns can be easily and accurately inserted into the corresponding first positioning holes, and the second positioning holes and the third positioning holes are similar to each other; the back plate and the middle frame are stably connected through positioning in three directions, the assembling process of the back plate and the middle frame is smoother and more efficient, and the alignment and adjustment time during assembling is shortened.

Description

Technical Field

[0001] This application belongs to the technical field of display devices, and particularly relates to a borderless backplane structure and a display device. Background Art

[0002] When assembling display devices with backplanes such as mobile phones and tablets, the backplane is usually embedded in the rear case. This installation method results in a relatively large exposed area of the middle frame, usually more than 1 mm. In some solutions, a 3D curved surface design is used to optimize the narrow edges, but the exposed area of the middle frame is still relatively large, and the display effect is poor, affecting the user experience. Summary of the Utility Model

[0003] Embodiments of this application provide a borderless backplane structure and a display device to solve the problem that the exposed area of the middle frame is relatively large during the installation of the existing backplane, affecting the user experience.

[0004] In a first aspect, embodiments of this application provide a borderless backplane structure, including:

[0005] A middle frame provided with a plurality of positioning posts;

[0006] A backplane provided with a set of positioning holes, the set of positioning holes including a main positioning round hole, a first positioning hole spaced from the main positioning round hole in a first direction, a second positioning hole spaced from the main positioning round hole in a second direction, and a third positioning hole spaced from the main positioning round hole in a third direction; the main positioning round hole, the first positioning hole, the second positioning hole, and the third positioning hole are respectively matched with one of the plurality of positioning posts;

[0007] Wherein, the first positioning hole and the positioning post it cooperates with are positioned relative to each other in a direction perpendicular to the first direction; the second positioning hole and the positioning post it cooperates with are positioned relative to each other in a direction perpendicular to the second direction; the third positioning hole and the positioning post it cooperates with are positioned relative to each other in a direction perpendicular to the third direction.

[0008] In some embodiments of this application, the first positioning hole, the second positioning hole, and the third positioning hole are all oval holes, and the long axis directions of the first positioning hole, the second positioning hole, and the third positioning hole are respectively parallel to the first direction, the second direction, and the third direction.

[0009] In some embodiments of this application, the first direction is the length direction, the second direction is the width direction, and the third direction is the diagonal direction.

[0010] In some embodiments of this application, the short axis lengths of the first positioning hole, the second positioning hole, and the third positioning hole are all equal to the diameter of the main positioning round hole.

[0011] In some embodiments of the present application, the main positioning round hole, the first positioning hole, the second positioning hole, and the third positioning hole are respectively located at the four corners of the back plate.

[0012] In some embodiments of the present application, the matching height H1 between the positioning hole group and the positioning post is greater than 0.3 mm; and / or, the Z-direction matching clearance H2 between the positioning hole group and the positioning post is greater than 0.1 mm.

[0013] In some embodiments of the present application, there is a first gap L1 between the inner side of the back plate and the middle frame, and a second gap L2 between the outer side of the back plate and the middle frame, and the first gap L1 is greater than the second gap L2.

[0014] In some embodiments of the present application, an adhesive layer is provided between the back plate and the middle frame, and the adhesive layer connects the back plate and the middle frame.

[0015] In some embodiments of the present application, the adhesive layer is formed by solidification of an adhesive, and the adhesive layer is provided in the gap between the back plate and the middle frame; and / or, a stepped portion is provided on the side of the back plate close to the middle frame, and the stepped portion and the middle frame define a receiving cavity for receiving the adhesive layer.

[0016] In a second aspect, an embodiment of the present application further provides a display device, and the display device includes the borderless back plate structure as described in any one of the above.

[0017] The borderless back plate structure provided by the embodiment of the present application realizes the connection between the back plate and the middle frame through the cooperation of the positioning hole group and the positioning post. Compared with the existing connection method of embedding the back plate into the middle frame, the exposed area of the middle frame can be greatly reduced, the borderless design of the back plate can be realized, and the user experience can be improved; and the first positioning hole and the positioning post cooperating with it are positioned in the vertical direction of the first direction and not positioned in the first direction, and the positioning post can be easily and accurately inserted into the corresponding first positioning hole. The same is true for the second positioning hole and the third positioning hole. The stable connection between the back plate and the middle frame is realized through positioning in three directions, and the assembly process of the back plate and the middle frame is smoother and more efficient, reducing the alignment and adjustment time during assembly.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0020] To more fully understand the present application and its beneficial effects, the following will be described in conjunction with the accompanying drawings. Among them, the same reference numerals in the following description represent the same parts.

[0021] Figure 1 Partial cross-sectional schematic of the backplane and the middle frame provided by the embodiment of the present application Figure 1 。

[0022] Figure 2 Top view of the backplane provided by the embodiment of the present application.

[0023] Figure 3 Cooperation schematic of the positioning posts and the positioning hole group provided by the embodiment of the present application Figure 1 。

[0024] Figure 4 Cooperation schematic of the positioning posts and the positioning hole group provided by the embodiment of the present application Figure 2 。

[0025] Figure 5 Partial cross-sectional schematic of the backplane and the middle frame provided by the embodiment of the present application Figure 2 。

[0026] Figure 6 Top view of the middle frame provided by the embodiment of the present application.

[0027] Figure 7 Top view of the borderless display structure provided by the embodiment of the present application.

[0028] Figure 8 Schematic of the installation method of the backplane and the middle frame in the prior art Figure 1 。

[0029] Figure 9 Schematic of the installation method of the backplane and the middle frame in the prior art Figure 2 。

[0030] Reference numerals:

[0031] 100, middle frame; 110, positioning posts;

[0032] 200, backplane; 210, positioning hole group; 211, main positioning round hole; 212, first positioning hole; 213, second positioning hole; 214, third positioning hole; 220, step portion; 221, accommodation cavity. Detailed implementation manners

[0033] The following further describes the implementation manners of the present application in detail with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0034] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0036] In the embodiments of the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0038] Referring to Figure 8 as shown, in the prior art, display devices such as mobile phones and tablets with a backplane 200 usually adopt an installation method in which the backplane 200 is embedded in the rear case. The backplane 200 is positioned by the four-sided frame, and the exposed area of the middle frame 100 is relatively large, usually more than 1.0 mm; Referring to Figure 9 as shown, in some solutions, 3D curved surface design is used to optimize the narrow edges, and the exposed area of the middle frame 100 is improved, usually about 0.6 mm. This solution requires a 3D process backplane 200 with high cost, and it is relatively difficult to fit and match with the middle frame 100.

[0039] An embodiment of this application provides a borderless backplane structure and a display device. Referring to Figures 1 - 7 as shown, to solve the problem that the exposed area of the existing display device is relatively large, which affects the user experience. The following will be described in conjunction with the drawings.

[0040] According to an embodiment of this application, a borderless backplane structure is provided. Referring to Figure 1 、 Figure 2 and Figure 6 as shown, it includes a middle frame 100 and a backplane 200 arranged on one side of the middle frame 100. The middle frame 100 is provided with a plurality of positioning posts 110, and the backplane 200 is provided with a positioning hole group 210. The positioning hole group 210 includes a main positioning round hole 211, a first positioning hole 212 spaced from the main positioning round hole 212 in the first direction, a second positioning hole 213 spaced from the main positioning round hole 211 in the second direction, and a third positioning hole 214 spaced from the main positioning round hole 211 in the third direction; The main positioning round hole 211, the first positioning hole 212, the second positioning hole 213, and the third positioning hole 214 are respectively matched with one of the plurality of positioning posts 110; wherein, the first positioning hole 212 and the positioning post 110 it cooperates with are positioned with each other in the vertical direction of the first direction; the second positioning hole 213 and the positioning post 110 it cooperates with are positioned with each other in the vertical direction of the second direction; the third positioning hole 214 and the positioning post 110 it cooperates with are positioned with each other in the vertical direction of the third direction.

[0041] It can be understood that in this embodiment, the connection between the middle frame 100 and the back plate 200 is realized through the positioning posts 110 and the positioning hole group 210. Compared with the installation method of embedding the back plate 200 into the rear shell, the back plate 200 can cover the middle frame 100 as much as possible, so that the exposed area of the middle frame 100 is as small as possible, thereby realizing the borderless or extremely narrow border design of the back plate 200, improving the overall aesthetics of the product and the user experience.

[0042] It should be noted that the first direction, the second direction and the third direction are not parallel to each other pairwise. In terms of the positioning method, a connection method of one main positioning round hole 211 and three positioning holes (the first positioning hole 212, the second positioning hole 213 and the third positioning hole 214) is adopted, and the positioning holes extend along three directions, realizing the precise positioning of the back plate 200 in multiple dimensions.

[0043] The borderless back plate structure of this embodiment realizes the connection between the back plate 200 and the middle frame 100 through the cooperation of the positioning hole group 210 and the positioning posts 110. Compared with the existing connection method of embedding the back plate 200 into the middle frame 100, the exposed area of the middle frame 100 can be greatly reduced, realizing the borderless design of the back plate 200 and improving the user experience; and the first positioning hole 212 and the positioning post 110 cooperating with it are positioned in the vertical direction of the first direction and not positioned in the first direction. The positioning post 110 can be easily and accurately inserted into the corresponding first positioning hole 212. The same is true for the second positioning hole 213 and the third positioning hole 214. The stable connection between the back plate 200 and the middle frame 100 is realized through the positioning in three directions, and the assembly process of the back plate 200 and the middle frame 100 is smoother and more efficient, reducing the alignment and adjustment time during assembly.

[0044] In an alternative embodiment, the first positioning hole 212, the second positioning hole 213 and the third positioning hole 214 are all oval holes, and the major axis directions of the first positioning hole 212, the second positioning hole 213 and the third positioning hole 214 are respectively parallel to the first direction, the second direction and the third direction. The oval positioning holes are convenient for processing, and the design of the oval positioning holes makes the assembly process of the back plate 200 and the middle frame 100 smoother and more efficient. The positioning posts 110 can be easily and accurately inserted into the corresponding positioning holes, greatly reducing the alignment and adjustment time during assembly and improving the production efficiency and assembly accuracy.

[0045] During the installation process, the main positioning round hole 211 can be used as a precise positioning hole. That is, after aligning the main positioning round hole 211 with the positioning post 110 first, then slightly adjust the back panel 200 to make the other three positioning holes also align with the positioning holes. The long axis directions of the oval holes are respectively parallel to their corresponding directions. This design allows a certain degree of freedom for the positioning post 110 when inserting, that is, it can be slightly adjusted in the long axis direction to adapt to the tiny deviations during the manufacturing and assembly processes, which is convenient for alignment during the assembly process. At the same time, the short axis direction of the oval hole restricts the movement of the positioning post 110, ensuring the accuracy and stability of the positioning.

[0046] According to an embodiment of the present application, referring to Figure 2 as shown, the first direction is the length direction, the second direction is the width direction, and the third direction is the diagonal direction.

[0047] In this embodiment, the connection line between the main positioning round hole 211 and the third positioning hole 214 is the diagonal of the back panel 200. This diagonal not only serves as the reference for dividing the back panel 200 but also as a precise positioning main line, which is the main reference line during the assembly process of the entire structure. By ensuring the precise alignment in the diagonal direction, the stability and precision of the overall structure can be improved.

[0048] The first positioning hole 212 is arranged in the triangular area of the upper half. Since the first positioning hole 212 is an oval hole and the long axis of the oval hole is along the length direction, the first positioning hole 212 has no strict positioning requirements in the length direction (i.e., the X-axis) and can allow a certain degree of floating or deviation. And it plays an auxiliary positioning role in the width direction (i.e., the Y-axis) to ensure a certain degree of precision in the width direction.

[0049] The second positioning hole 213 is arranged in the triangular area of the lower half. Since the second positioning hole 213 is an oval hole and the long axis of the oval hole is along the width direction, the second positioning hole 213 has no strict positioning requirements in the width direction (i.e., the Y-axis) and can allow a certain degree of floating or deviation. And it plays an auxiliary positioning role in the length direction (i.e., the X-axis) to ensure the precision in the length direction.

[0050] In an alternative embodiment, referring to Figure 4As shown, the circumferential gap L3 between the main positioning circular hole 211 and the positioning post 110 is 0.03 - 0.05 mm. For example, the circumferential gap L3 can be 0.03 mm, 0.04 mm, 0.05 mm, etc. The circumferential gap L3 should not be too large to avoid a decrease in positioning accuracy; nor should it be too small to avoid increasing the assembly difficulty. The gap range of 0.03 - 0.05 mm allows a certain amount of fine-tuning space for the positioning post 110 when inserted into the main positioning circular hole 211 to accommodate minor deviations during the manufacturing and assembly processes. At the same time, it can also provide a certain amount of buffering when the temperature changes or material stress is released, preventing structural damage caused by thermal expansion and contraction or stress concentration.

[0051] In an alternative embodiment, referring to Figure 4 As shown, the gap L4 between the first positioning hole 212, the second positioning hole 213, and the third positioning hole 214 and the positioning post 110 along their long axis directions is 0.3 - 0.5 mm. For example, it can be values such as 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc. The gap L4 in the long axis direction of the elliptical hole provides a greater fine-tuning space for the positioning post 110, allowing necessary angular and position adjustments during the assembly process.

[0052] By reasonably setting the circumferential gap L3 between the main positioning circular hole 211 and the positioning post 110 and the gap L4 in the long axis direction between the elliptical hole and the positioning post 110, the positioning design of this borderless backplane structure can ensure high-precision positioning while providing sufficient assembly flexibility and fault tolerance, improving the overall performance and reliability of the product, and also reducing the difficulty and cost of manufacturing and assembly.

[0053] According to an embodiment of the present application, the minor axis lengths of the first positioning hole 212, the second positioning hole 213, and the third positioning hole 214 are all equal to the diameter of the main positioning circular hole 211. By setting the minor axis length of the elliptical hole to be equal to the diameter of the main positioning circular hole 211, it can be ensured that in at least one direction (i.e., the minor axis direction), these positioning holes and the main positioning circular hole 211 have the same positioning reference, which helps to achieve high-precision alignment during the assembly process.

[0054] According to an embodiment of the present application, referring to Figure 2 As shown, the main positioning circular hole 211, the first positioning hole 212, the second positioning hole 213, and the third positioning hole 214 are respectively located at the four corners of the backplane 200.

[0055] It can be understood that in this embodiment, the main positioning round hole 211, the first positioning hole 212, the second positioning hole 213, and the third positioning hole 214 are respectively located at the four corners of the backplane 200, which can form a stable four-corner support structure. This structure enables the backplane 200 to more evenly disperse and resist these forces when subjected to external forces, thereby avoiding local stress concentration and deformation and enhancing the overall stability of the backplane 200.

[0056] According to an embodiment of the present application, referring to Figure 3 as shown, the mating height H1 between the positioning hole group 210 and the positioning post 110 is greater than 0.3 mm; and / or, the Z-direction mating clearance H2 between the positioning hole group 210 and the positioning post 110 is greater than 0.1 mm.

[0057] The mating height H1 refers to the contact length between the positioning post 110 and the positioning hole in the vertical direction (usually the Z direction) after the positioning post 110 is inserted into the positioning hole. An overly small mating height may result in an insecure connection and is likely to become loose when stressed. Therefore, a mating height greater than 0.3 mm ensures that the positioning post 110 can be fully inserted into the positioning hole to form a stable connection, which helps to resist loosening or displacement caused by vibration or external forces.

[0058] The Z-direction mating clearance H2 refers to the clearance between the positioning post 110 and the bottom of the positioning hole group 210 in the vertical direction. This clearance allows the positioning post 110 to have a certain floating space when inserted into the positioning hole to accommodate minor deviations during manufacturing and assembly. At the same time, it can also provide a certain buffer during temperature changes or material stress release, preventing structural damage caused by thermal expansion and contraction or stress concentration.

[0059] In an alternative embodiment, the mating height H1 is greater than 0.3 mm and the mating clearance H2 is greater than 0.1 mm. Therefore, the depth of the positioning hole group 210 needs to satisfy being greater than 0.4 mm.

[0060] According to an embodiment of the present application, referring to Figure 5 as shown, when the backplane 200 is installed on the middle frame 100, there is a first gap L1 between the inner side of the backplane 200 and the middle frame 100, and a second gap L2 between the outer side of the backplane 200 and the middle frame 100, and the first gap L1 is greater than the second gap L2.

[0061] In this embodiment, by designing the inner first gap L1 to be greater than the outer second gap L2, the visible gap between the outer side of the backplane 200 and the middle frame 100 can be minimized as much as possible after installation. The smaller outer gap reduces the visual obtrusiveness and makes the appearance of the product more neat and unified.

[0062] According to an embodiment of the present application, an adhesive layer is provided between the back plate 200 and the middle frame 100, and the adhesive layer connects the back plate 200 and the middle frame 100.

[0063] In this embodiment, the adhesive layer may be composed of one or more adhesives. After curing, the adhesives can form a strong bonding force to tightly connect the back plate 200 and the middle frame 100 together, making the connection between the back plate 200 and the middle frame 100 more firm.

[0064] Optionally, the back plate 200 and the middle frame 100 may be connected by means of dispensing. Through a special dispensing device, the adhesive is precisely coated in the form of dots at specific positions on the back plate 200 and the middle frame 100, which can precisely control the position, size and quantity of the glue dots, reduce the waste of glue, and also reduce the risk of glue overflow.

[0065] Optionally, the back plate 200 and the middle frame 100 may also be connected by means of dispensing + back glue, which not only utilizes the comprehensive bonding effect of the back glue, but also realizes local strengthening and precise positioning through dispensing.

[0066] According to an embodiment of the present application, as shown in Figure 5 the adhesive layer is formed by solidification of the adhesive, and the adhesive layer is disposed in the gap between the back plate 200 and the middle frame 100 to achieve a firm connection between the back plate 200 and the middle frame 100; and / or, a stepped portion 220 is provided on one side of the back plate 200 close to the middle frame 100, and the stepped portion 220 and the middle frame 100 define a receiving cavity 221 for receiving the adhesive layer.

[0067] In this embodiment, the stepped portion 220 of the back plate 200 and the middle frame 100 enclose a receiving cavity 221. The main purpose of this receiving cavity 221 is to receive the adhesive layer to prevent glue overflow during the brushing and solidification processes. The receiving cavity 221 provides a clear and restricted space for the adhesive of the adhesive layer, so that during the brushing and solidification processes, the excess adhesive can be restricted within this space, thus avoiding the risk of glue overflowing to the outside of the product.

[0068] For the borderless back plate structure of the embodiment of the present application, as shown in Figure 7 visually, a borderless design can be achieved. After measurement, the width of the exposed area of the middle frame 100 can reach 0.07 mm, and the surrounding fitting gaps are small, with consistent overall appearance, improving the user experience.

[0069] In a second aspect, the embodiment of the present application further provides a display device, and the display device includes the borderless back plate structure as described in any one of the above.

[0070] It should be noted that the display device can be a mobile phone, a tablet computer, a smart wearable device, an e-reader, an in-vehicle display screen or other electronic devices. By applying the above-mentioned borderless backplane structure, the exposed area of the middle frame 100 is reduced, and the finished product is more tidy and beautiful, improving the user experience.

[0071] It can be understood that since the borderless backplane structure has the beneficial effects of the above-mentioned embodiments, the display device correspondingly has the beneficial effects of the above-mentioned embodiments. The specific implementation manner can refer to the above-mentioned embodiments, and this embodiment will not be elaborated herein.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any combination, modification or equivalent replacement of the technical solutions of the present application does not depart from the spirit and scope of the technical solutions of the present application, and should all be covered by the protection scope of the present application.

Claims

1. A borderless backplane structure, characterized in that, Including: A middle frame (100) provided with a plurality of positioning posts (110); A back plate (200) provided with a positioning hole group (210), the positioning hole group (210) including a main positioning round hole (211), a first positioning hole (212) spaced from the main positioning round hole (211) in a first direction, a second positioning hole (213) spaced from the main positioning round hole (211) in a second direction, and a third positioning hole (214) spaced from the main positioning round hole (211) in a third direction; the main positioning round hole (211), the first positioning hole (212), the second positioning hole (213), and the third positioning hole (214) are respectively matched with one of the plurality of positioning posts (110); Wherein, the first positioning hole (212) and the positioning post (110) it cooperates with are positioned with each other in a direction perpendicular to the first direction; the second positioning hole (213) and the positioning post (110) it cooperates with are positioned with each other in a direction perpendicular to the second direction; the third positioning hole (214) and the positioning post (110) it cooperates with are positioned with each other in a direction perpendicular to the third direction.

2. The borderless backplane structure according to claim 1, wherein The first positioning hole (212), the second positioning hole (213), and the third positioning hole (214) are all elliptical holes, and the major axis directions of the first positioning hole (212), the second positioning hole (213), and the third positioning hole (214) are respectively parallel to the first direction, the second direction, and the third direction.

3. The borderless backplane structure according to claim 1, characterized in that The first direction is the length direction, the second direction is the width direction, and the third direction is the diagonal direction.

4. The borderless backplane structure according to claim 2, characterized in that, The minor axis lengths of the first positioning hole (212), the second positioning hole (213), and the third positioning hole (214) are all equal to the diameter of the main positioning round hole (211).

5. The borderless backplane structure according to claim 1, characterized in that The main positioning round hole (211), the first positioning hole (212), the second positioning hole (213), and the third positioning hole (214) are respectively located at the four corners of the back plate (200).

6. The borderless backplane structure according to claim 1, characterized in that, The matching height H1 between the positioning hole group (210) and the positioning post (110) is greater than 0.3 mm; and / or, the Z-direction matching gap H2 between the positioning hole group (210) and the positioning post (110) is greater than 0.1 mm.

7. The borderless backplane structure according to claim 1, characterized in that The inner side of the back plate (200) has a first gap L1 with the middle frame (100), the outer side of the back plate (200) has a second gap L2 with the middle frame (100), and the first gap L1 is greater than the second gap L2.

8. The borderless backplane structure according to any one of claims 1-7, characterized in that, An adhesive layer is provided between the back plate (200) and the middle frame (100), and the adhesive layer connects the back plate (200) and the middle frame (100).

9. The borderless backplane structure according to claim 8, wherein The adhesive layer is formed by solidification of an adhesive, and the adhesive layer is disposed in a gap between the back plate (200) and the middle frame (100); and / or, a stepped portion (220) is provided on a side of the back plate (200) close to the middle frame (100), and the stepped portion (220) and the middle frame (100) define a receiving cavity (221) for receiving the adhesive layer.

10. A display device, characterized in that, The display device includes the borderless back plate structure according to any one of claims 1-9.

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