Backlight module and display device

Abstract

The invention discloses a backlight module and a display device.The backlight module comprises a middle frame, a backlight rear shell and a cover plate, the middle frame is arranged between the backlight rear shell and the cover plate, the backlight rear shell is provided with a supporting face in the circumferential direction, the middle frame is in lap joint with the supporting face, the supporting face is provided with a first supporting part, and the middle frame is provided with a positioning hole; the first supporting part penetrates through the positioning hole and supports the cover plate, the first supporting part is matched with the positioning hole, at least one outer side face of the backlight rear shell is provided with a second supporting part, and one end of the second supporting part protrudes out of the supporting face and supports the cover plate. According to the structure of the backlight module, the relative displacement amount of the middle frame and the backlight rear shell of the backlight module under the action of vibration force is reduced, then the powder amount generated by mutual friction between the middle frame and the backlight rear shell is reduced, the cover plate is effectively prevented from collapsing, and the dispensing amount between the cover plate and the middle frame is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic displays, and in particular to a backlight module and a display device. Background Art

[0002] Mini-LEDs have been widely used in direct-lit backlight modules in recent years. They offer thin and light panels, high image quality, and low power consumption. Their performance approaches that of OLEDs, while surpassing them in brightness and color rendering. Furthermore, Mini-LED backlights can incorporate sophisticated local dimming technology, enabling real-time control of the on / off and brightness of corresponding backlight zones. This delivers high contrast, more vibrant colors, and achieves the high dynamic range (HDR) screen effect.

[0003] Mini-LED plays an important role in the realization of high dynamic range display, but in the existing technology, the structure of the backlight module has the following problems: 1. The backlight module used in Mini-LED includes a middle sheet metal and a backlight back shell, which are connected by clips and tapes. However, since the middle sheet metal and the backlight back shell are made of stainless steel and aluminum alloy respectively, the hardness difference between the two is large. When the display device is subjected to vibration force, the middle sheet metal and the backlight back shell will inevitably move relative to each other, and the middle sheet metal and the backlight back shell will rub against each other to produce powder; 2. When the cover plate and the middle sheet metal are connected by glue, since the glue has a certain fluidity, the height of the glue at the glue spot is inconsistent, and the cover plate is prone to collapse. Summary of the Invention

[0004] The object of the present invention is to provide a backlight module and a display device, which reduce the displacement between the middle frame and the backlight rear shell when the display device is subjected to vibration force, and the cover plate is not easy to collapse when connecting the cover plate and the middle frame.

[0005] The present invention provides a backlight module, including a middle frame, a backlight rear shell and a cover plate, the middle frame is arranged between the backlight rear shell and the cover plate, the backlight rear shell is provided with a supporting surface along the circumferential direction, the middle frame is overlapped on the supporting surface, a first supporting portion is provided on the supporting surface, a positioning hole is provided on the middle frame, the first supporting portion passes through the positioning hole and supports the cover plate, the first supporting portion is adapted to the positioning hole, at least one outer side surface of the backlight rear shell is provided with a second supporting portion, one end of the second supporting portion protrudes from the supporting surface and supports the cover plate.

[0006] Based on the same inventive concept, the present invention further provides a display device including the above-mentioned backlight module.

[0007] Compared with the prior art, the backlight module provided by the present invention has a first supporting portion provided on the supporting surface of the backlight rear shell, a positioning hole provided on the middle frame, and the first supporting portion inserted into the positioning hole. The first supporting portion is adapted to the positioning hole, effectively limiting the relative position of the middle frame and the backlight rear shell, reducing the relative displacement of the middle frame and the backlight rear shell under the action of vibration force, thereby reducing the amount of powder generated by the mutual friction between the middle frame and the backlight rear shell, and improving the quality of the backlight module; when dispensing glue between the middle frame and the cover plate, the first supporting portion and the second supporting portion support the cover plate to ensure the gap between the cover plate and the middle frame, so that the amount of glue in each part is the same, effectively preventing the cover plate from collapsing, and the second supporting portion is provided on the side of the backlight rear shell, while effectively supporting the cover plate, the amount of glue dispensed between the cover plate and the middle frame can be increased, thereby improving the connection strength between the cover plate and the middle frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Schematic diagram of the connection structure between the middle frame and the backlight rear cover provided by an embodiment of the present invention;

[0009] Figure 2 This is a schematic diagram of a first partial structure of the connection between the middle frame, the backlight rear housing and the cover plate provided by an embodiment of the present invention;

[0010] Figure 3 This is a schematic diagram of a second partial structure of the connection between the middle frame, the backlight rear housing and the cover plate provided by an embodiment of the present invention;

[0011] Figure 4 1 is a schematic structural diagram of a backlight rear housing provided by an embodiment of the present invention;

[0012] Figure 5 It is a schematic structural diagram of the middle frame provided by an embodiment of the present invention.

[0013] In the picture:

[0014] 1. Middle frame; 2. Backlight cover; 3. Cover; 4. First adhesive block; 5. Third adhesive tape;

[0015] 11. Positioning hole; 12. Bump; 13. Side plate; 14. First connecting hole;

[0016] 21. Support surface; 22. First support portion; 23. Second support portion; 24. Groove; 25. Second adhesive tape; 26. Second connecting hole. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0018] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0019] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0020] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0021] This embodiment provides a backlight module, comprising a middle frame, a backlight rear housing, and a cover plate. The middle frame is disposed between the backlight rear housing and the cover plate, the backlight rear housing being provided with a support surface along its circumference, the middle frame being overlapped on the support surface, the support surface being provided with a first support portion, the middle frame being provided with a positioning hole, the first support portion passing through the positioning hole and supporting the cover plate, the first support portion being adapted to the positioning hole, and a second support portion being provided on at least one outer side surface of the backlight rear housing, one end of the second support portion protruding from the support surface and supporting the cover plate.

[0022] A first supporting portion is provided on the supporting surface of the backlight rear shell, a positioning hole is provided on the middle frame, and the first supporting portion is inserted into the positioning hole. The first supporting portion is adapted to the positioning hole, which effectively defines the relative position of the middle frame and the backlight rear shell, and reduces the relative displacement of the middle frame and the backlight rear shell under the action of the vibration force of the backlight module, thereby reducing the amount of powder generated by the mutual friction between the middle frame and the backlight rear shell, and improving the quality of the backlight module; when dispensing glue between the middle frame and the cover plate, the first supporting portion and the second supporting portion support the cover plate to ensure the gap between the cover plate and the middle frame, so that the amount of glue in each part is the same, effectively preventing the cover plate from collapsing, and the second supporting portion is provided on the side of the backlight rear shell. While effectively supporting the cover plate, the amount of glue dispensed between the cover plate and the middle frame can be increased, thereby improving the connection strength between the cover plate and the middle frame.

[0023] Figure 1 The diagram shows the structure of the connection between the middle frame and the backlight rear shell. Figure 1 As shown, the backlight module includes a middle frame 1 and a backlight rear shell 2. The backlight rear shell 2 is provided with a supporting surface 21 along the circumference. The middle frame 1 is overlapped on the supporting surface 21. A first supporting portion 22 is provided on the supporting surface 21. A positioning hole 11 is provided on the middle frame 1. The first supporting portion 22 passes through the positioning hole 11 and is adapted to the positioning hole 11. A second supporting portion 23 is provided on at least one outer side surface of the backlight rear shell 2, and one end of the second supporting portion 23 protrudes from the supporting surface 21.

[0024] A first supporting portion 22 is provided on the supporting surface 21 of the backlight rear shell 2. A positioning hole 11 is provided on the middle frame 1. The first supporting portion 22 is inserted into the positioning hole 11. The first supporting portion 22 is adapted to the positioning hole 11, effectively defining the relative position of the middle frame 1 and the backlight rear shell 2, reducing the relative displacement of the middle frame 1 and the backlight rear shell 2 under the action of vibration force of the backlight module, thereby reducing the amount of powder generated by the mutual friction between the middle frame 1 and the backlight rear shell 2, and improving the quality of the backlight module.

[0025] Figure 2 The diagram shows the structure of the connection between the middle frame, backlight rear housing, and cover plate. The first support portion 22 passes through the positioning hole 11 in the middle frame 1 to support the cover plate 3. The end of the first support portion 22 in contact with the cover plate 3 is provided with a first adhesive tape, which is adhered to the cover plate 3. The first adhesive tape adheres to the cover plate 3 and serves to pre-position the cover plate 3, preventing displacement of the cover plate 3 during glue application between the middle frame 1 and the cover plate 3, thereby ensuring the quality of the glue application between the middle frame 1 and the cover plate 3. Furthermore, the first adhesive tape on the first support portion 22 prevents the ink on the cover plate 3 from being scratched by the first support portion 22. Optionally, the first adhesive tape is double-sided for ease of use.

[0026] like Figure 2As shown, in some embodiments, a first adhesive block 4 is provided circumferentially around the first support portion 22 between the middle frame 1 and the cover plate 3. The first adhesive block 4 is used to bond the middle frame 1 to the cover plate 3, thereby achieving localized adhesive bonding between the middle frame 1 and the cover plate 3. This ensures a stable connection between the cover plate 3 and the middle frame 1 while reducing production costs. The first adhesive block 4 is formed by solidifying a fluid adhesive.

[0027] In other embodiments, a tape or second adhesive block for bonding the middle frame 1 to the cover plate 3 is provided between the middle frame 1 and the cover plate 3, away from the first support portion 22. If a second adhesive block is provided between the middle frame 1 and the cover plate 3, partial bonding of the middle frame 1 and the cover plate 3 is achieved. The second adhesive blocks are evenly spaced between the middle frame 1 and the cover plate 3, ensuring the stability of the connection between the cover plate 3 and the middle frame 1. The second adhesive block is formed by solidifying a fluid adhesive. If an adhesive tape is provided between the middle frame 1 and the cover plate 3, partial bonding of the middle frame 1 and the cover plate 3 is achieved. The adhesive tape is double-sided, making it easy to use and preventing adhesive flow.

[0028] In some embodiments, a third adhesive tape 5 is provided between the middle frame 1 and the support surface 21 of the backlight rear shell 2. The third adhesive tape 5 adheres the middle frame 1 to the support surface 21 to fix the position of the middle frame 1 relative to the backlight rear shell 2, facilitates the subsequent assembly of the cover plate 3, and improves the relative position accuracy between the backlight rear shell 2, the middle frame 1 and the cover plate 3.

[0029] Figure 3 The diagram shows the structure of the connection between the middle frame, backlight shell and cover. Figure 3 As shown, one end of the second support portion 23 protrudes from the support surface 21 and supports the cover plate 3. When dispensing glue between the middle frame 1 and the cover plate 3, the first support portion 22 and the second support portion 23 support the cover plate 3 to ensure a gap between the cover plate 3 and the middle frame 1, so that the amount of glue in each part is the same, effectively preventing the cover plate 3 from collapsing. In addition, the second support portion 23 is arranged on the side of the backlight rear housing 2. While effectively supporting the cover plate 3, it can also increase the amount of glue dispensed between the cover plate 3 and the middle frame 1, thereby improving the connection strength between the cover plate 3 and the middle frame 1.

[0030] A second adhesive tape 25 is provided on one end of the second support portion 23 protruding from the support surface 21. The second adhesive tape 25 is bonded to the cover plate 3, securing the cover plate 3 to the backlight rear housing 2 and preventing the second support portion 23 from directly contacting the cover plate 3 and thereby scratching the cover plate 3. Optionally, the second adhesive tape 25 includes double-sided tape with one side bonded to the second support portion 23 and the other side bonded to the cover plate 3, for ease of use.

[0031] Figure 4 The structure diagram of the backlight shell is shown as follows: Figure 4As shown, a groove 24 is formed on one side of the backlight rear housing 2. At least one first support portion 22 is provided on the support surfaces 21 on opposite sides of the groove 24. Positioning holes 11 corresponding to the first support portions 22 are provided on the middle frame 1. The first support portions 22 provided on opposite sides of the groove 24 can serve as the starting and ending points for dispensing glue. The first support portion 22 cooperates with the second support portion 23 to support the cover plate 3. A first support portion 22 can be provided on each of the support surfaces 21 on opposite sides of the groove 24, simplifying the structure of the backlight module.

[0032] Optionally, at least two second support portions 23 are provided on the outer side of the backlight rear housing 2 where the groove 24 is not provided. The support surface 21 where the groove 24 is provided supports the cover plate 3 via the first support portion 22, while the remaining portion supports the cover plate 3 via the second support portions 23, ensuring that all four sides of the cover plate 3 are effectively supported. The second support portions 23 are provided on the outer side of the backlight rear housing 2 without affecting the amount of glue dispensed between the middle frame 1 and the cover plate 3, thereby improving the stability of the bonding between the middle frame 1 and the cover plate 3.

[0033] The distance between two adjacent second support portions 23 is greater than or equal to 30 cm and less than or equal to 50 cm. While ensuring stable support for the cover plate 3, the number of second support portions 23 is reduced to simplify the structure of the backlight module. Optionally, the distance between two adjacent second support portions 23 is 30 cm, 40 cm, or 50 cm.

[0034] Figure 5 The structure diagram of the middle frame is shown in FIG. Figure 5 As shown, in some embodiments, a plurality of protrusions 12 are provided at intervals along the circumferential direction on one side of the middle frame 1 . The protrusions 12 are used to support the cover plate 3 while also improving the structural strength of the middle frame 1 .

[0035] Optionally, the height of the bump 12 is consistent with the height of the first support portion 22 protruding from the middle frame 1 to effectively support the cover plate 3. The height of the bump 12 is greater than or equal to 0.3 mm and less than or equal to 0.5 mm. The height of the bump 12 is 0.3 mm, 0.4 mm, or 0.5 mm.

[0036] In order not to affect the amount of glue dispensed between the middle frame 1 and the cover plate 3 while ensuring the structural strength of the middle frame 1, the length of the bump 12 is greater than or equal to 6 mm and less than or equal to 10 mm, and the width of the bump 12 is greater than or equal to 1.5 mm and less than or equal to 2 mm.

[0037] Optionally, a plurality of injection molding grooves are provided along the circumference on one side of the middle frame 1 facing the cover plate 3, and a bump 12 is injection-molded in each injection molding groove, which simplifies the processing technology and reduces the production cost. The bump 12 and the middle frame 1 are an integral connection structure with high structural strength.

[0038] The thickness of the middle frame 1 is greater than or equal to 0.2mm and less than or equal to 0.4mm. The outer side of the middle frame 1 is provided with a plurality of side panels 13 at intervals. The plurality of side panels 13 are respectively connected to the middle frame 1 vertically. The side panels 13 are connected to the middle frame 1 as shown in FIG. Figure 4 The outer side surface of the backlight rear shell 2 shown is fitted together, a first connecting hole 14 is provided on the side panel 13, and a second connecting hole 26 is provided on the backlight rear shell 2. The first connecting hole 14 and the second connecting hole 26 are connected by screws, thereby realizing the connection between the middle frame 1 and the backlight rear shell 2 and improving the connection strength between the middle frame 1 and the backlight rear shell 2.

[0039] This embodiment further provides a display device including the above-mentioned backlight module. The display device also includes other structures, which are prior art and will not be described in detail here.

[0040] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A backlight module, characterized in that: The invention comprises a middle frame, a backlight rear shell and a cover plate, wherein the middle frame is arranged between the backlight rear shell and the cover plate, the backlight rear shell is provided with a supporting surface along the circumference, the middle frame is overlapped on the supporting surface, a first supporting portion is provided on the supporting surface, a positioning hole is provided on the middle frame, the first supporting portion passes through the positioning hole and supports the cover plate, the first supporting portion is adapted to the positioning hole, and a second supporting portion is provided on at least one outer side surface of the backlight rear shell, one end of the second supporting portion protrudes from the supporting surface and supports the cover plate.

2. The backlight module according to claim 1, wherein: A groove is formed on one side of the backlight rear shell, at least one first supporting portion is respectively formed on the supporting surfaces on two opposite sides of the groove, and the middle frame is provided with positioning holes corresponding to the first supporting portions.

3. The backlight module according to claim 1, wherein: A first adhesive tape is provided on the end of the first supporting portion that contacts the cover plate, and the first adhesive tape is adhered to the cover plate.

4. The backlight module according to claim 1, wherein: A first adhesive block is provided between the middle frame and the cover plate at a circumferential position surrounding the first support portion, and the first adhesive block is used to adhere the middle frame to the cover plate.

5. The backlight module according to claim 1, wherein: An adhesive tape or a second adhesive block for bonding the middle frame to the cover plate is provided at a position between the middle frame and the cover plate away from the first supporting portion.

6. The backlight module according to claim 2, wherein: At least two second supporting parts are provided on the outer side of the backlight rear cover where the groove is not provided.

7. The backlight module according to claim 6, wherein: The distance between two adjacent second support parts is greater than or equal to 30 cm and less than or equal to 50 cm.

8. The backlight module according to claim 1, wherein: A second adhesive tape is provided on one end of the second supporting portion protruding from the supporting surface, and the second adhesive tape is adhered to the cover plate.

9. The backlight module according to claim 8, wherein: The second adhesive tape includes a double-sided adhesive tape, one side of the double-sided adhesive tape is bonded to the second supporting portion, and the other side of the double-sided adhesive tape is bonded to the cover plate.

10. The backlight module according to any one of claims 1 to 9, characterized in that: A plurality of protrusions are provided at intervals along the circumferential direction on one side of the middle frame facing the cover plate.

11. The backlight module according to claim 10, wherein: The height of the bump is greater than or equal to 0.3 mm and less than or equal to 0.5 mm, the length of the bump is greater than or equal to 6 mm and less than or equal to 10 mm, and the width of the bump is greater than or equal to 1.5 mm and less than or equal to 2 mm.

12. The backlight module according to claim 10, wherein: A plurality of injection molding grooves are provided at intervals along the circumferential direction on one side of the middle frame facing the cover plate, and the protrusion is injection-molded in each of the injection molding grooves.

13. A display device, characterized in that: The invention comprises a backlight module as claimed in any one of claims 1 to 12.

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