Backlight module and display device

Abstract

This application provides a backlight module and display device, relating to the field of display equipment technology. The backlight module includes: a backplate with a receiving groove; a positioning piece housed within the receiving groove, the positioning piece having multiple positioning protrusions located on the side of the positioning piece away from the backplate and spaced apart along the length of the positioning piece; and multiple LED strips spaced apart along the length of the positioning piece, each LED strip having a positioning hole into which the positioning protrusions are inserted. The backlight module provided by this application positions the LED strips using the positioning piece. For different LED strip layout schemes, only the positioning piece needs to be replaced, without replacing the backplate, thus allowing the same backplate to be compatible with more LED strip layout schemes. Furthermore, the backplate only needs a receiving groove, eliminating the need for a positioning structure, resulting in a simple structure and low manufacturing cost.

Description

Technical Field

[0001] This application belongs to the field of display device technology, and more specifically, relates to a backlight module and display device. Background Technology

[0002] In the traditional manufacturing process of backlight modules, the backplate is typically designed with positioning protrusions that correspond one-to-one with the number of LED strips to ensure precise assembly. However, this design has significant limitations: when developing products of different grades, LED strips may be added or removed to achieve different brightness or zone control. The original backplate, due to the fixed layout of the positioning protrusions, cannot adapt to the changed LED strip configuration, necessitating the creation of a new mold to manufacture a backplate of the corresponding specifications. In other words, traditional backplates are not compatible with various LED strip layout schemes and have poor versatility. Utility Model Content

[0003] The purpose of this application is to provide a backlight module and display device to solve the technical problem that a single specification of backplate cannot be compatible with multiple light strip layout schemes in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a backlight module, comprising:

[0005] Back plate, the back plate being provided with a receiving groove;

[0006] A positioning piece is housed in the receiving groove. The positioning piece has a plurality of positioning protrusions located on the side of the positioning piece away from the back plate and spaced apart along the length direction of the positioning piece.

[0007] Multiple light strips are spaced apart along the length of the positioning piece. Each light strip has a positioning hole, and the positioning protrusion is inserted into the positioning hole.

[0008] Optionally, the cross-sectional area of ​​the positioning bump gradually decreases from the root to the top.

[0009] Optionally, the backlight module further includes a grounding component, the positioning plate has a through hole that passes through the positioning protrusion, and the grounding component is inserted into the through hole and contacts the light strip.

[0010] Optionally, the grounding component includes a rod and a cap fixed to one end of the rod, the rod being inserted into the through hole and the cap being pressed onto the light strip.

[0011] Optionally, there is a gap between the end of the rod and the back plate.

[0012] Optionally, the rod body is a stepped rod, and the stepped surface of the stepped rod abuts against the end of the positioning protrusion.

[0013] Optionally, the backlight module further includes an adapter plate and a connector, the connector being fixed to the adapter plate, the adapter plate being connected to the back plate, and the end of the light strip being connected to the connector.

[0014] Optionally, the backlight module further includes a power board, which is fixed to the back plate on the side away from the positioning plate by grounding screws.

[0015] Optionally, the thickness of the positioning piece is consistent with the depth of the receiving groove; and / or, the width of the groove opening is greater than the width of the groove bottom.

[0016] This application also provides a display device, which includes a housing and a backlight module as described above, wherein the backlight module is mounted on the housing.

[0017] The beneficial effects of the backlight module and display device provided in this application are as follows: Compared with the prior art, the backlight module provided in this application uses positioning pieces to position the light strips. For different light strip layout schemes, only the positioning pieces need to be replaced, without replacing the back plate. This allows the same back plate to be compatible with more light strip layout schemes. In addition, the back plate only needs to have a receiving groove, without the need to set a positioning structure. The structure is simple and the processing and manufacturing cost is low. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the backlight module provided in an embodiment of this application;

[0020] Figure 2 This is a partial structural schematic diagram of the backlight module provided in the embodiments of this application;

[0021] Figure 3 A schematic diagram illustrating the fit between the backplate, positioning piece, and adapter plate provided in an embodiment of this application;

[0022] Figure 4 for Figure 3 The structure shown is an enlarged view at point A;

[0023] Figure 5 This is a schematic diagram of the structure of the lamp body used in the embodiments of this application;

[0024] Figure 6 A partial side view of the backlight module provided in an embodiment of this application;

[0025] Figure 7 A cross-sectional view of the positioning piece provided in an embodiment of this application;

[0026] Figure 8 This is a schematic diagram of the structure of the grounding element provided in the embodiments of this application;

[0027] Figure 9 A partial structural schematic diagram of the backplate provided in an embodiment of this application;

[0028] Figure 10 This is a partial cross-sectional schematic diagram of the backlight module provided in an embodiment of this application.

[0029] The following are the labeling elements in the figure:

[0030] 10. Back panel; 11. Receiving groove;

[0031] 20. Positioning plate; 21. Positioning protrusion; 22. Through hole;

[0032] 30. LED strip; 31. Positioning hole; 301. LED board; 302. LED chip;

[0033] 40. Grounding piece; 41. Rod body; 42. Cap body;

[0034] 50. Adapter board; 51. Connector;

[0035] 60. Power board; 61. Grounding screw. Detailed Implementation

[0036] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0037] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0038] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] 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 application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] In display devices such as smartphones, TVs, and tablets, high-end, mid-range, and low-end models differ significantly in the number of backlight zones, peak brightness, and color gamut / color accuracy. During manufacturing, different price ranges balance performance and price by adjusting the number of LED strips. Typically, the LED strips are positioned using protrusions on the backplate. Different backplates are required for different price ranges due to the varying number of LED strips; in other words, the number of LED strips and the backplate must correspond. Therefore, for different price ranges, the backplate needs to be adjusted accordingly when the number of LED strips changes. A single backplate can only accommodate one optical solution, resulting in higher overall costs.

[0041] This application provides a backlight module, such as... Figure 1 and Figure 2 As shown, it includes a back plate 10, a positioning piece 20, and multiple light strips 30. The back plate 10 has a receiving groove 11, and the positioning piece 20 is received in the receiving groove 11. The positioning piece 20 has multiple positioning protrusions 21, which are spaced apart along the length of the positioning piece 20 and located on the side of the positioning piece 20 away from the back plate 10. Each light strip 30 has a positioning hole 31, such as... Figure 4 As shown, the positioning protrusion 21 is inserted into the positioning hole 31. (See reference...) Figure 1 and Figure 2 Multiple light strips 30 are spaced apart along the length of the positioning piece 20.

[0042] See Figure 5 The light strip 30 includes a plate and LED beads 302 disposed on the plate, with multiple LED beads 302 spaced apart along the length of the light plate 301. Figure 5 As shown, the lamp panel 301 is U-shaped, and each branch of the lamp panel 301 is provided with multiple lamp beads 302. The multiple lamp beads 302 on the same branch are evenly distributed.

[0043] In some embodiments, such as Figure 1 , Figure 2 and Figure 5As shown, the light strip 30 is U-shaped, and its closed end is inserted and fixed to the connector 51. The back plate 10 has a receiving groove 11, which houses the positioning piece 20. Optionally, the receiving groove 11 is formed by stamping. Each of the two branches of the light strip 30 has a positioning hole 31, which corresponds to and engages with two positioning protrusions 21. The light strip 30 is thus fixed by the engagement of the positioning protrusions and the positioning holes 31, as well as the connection between the end of the light strip 30 and the connector 51. In some embodiments, the light strip 30 is elongated, with two positioning holes 31 along its length. The back plate 10 has two receiving grooves 11, which are spaced apart along the length of the light strip 30. Each light strip 30 has two positioning holes 31, which correspond to the positioning protrusions on the two positioning pieces 20. The light strip 30 is fixed by the two positioning pieces 20, and multiple light strips 30 are spaced apart along the length of the positioning pieces 20.

[0044] The back panel 10 has multiple receiving slots 11, each receiving slot 11 housing a positioning piece 20. Each positioning piece 20 can fix multiple light strips 30. Figure 1 and Figure 3 As shown, the back plate 10 is provided with two receiving slots 11, and the two positioning slots are arranged in parallel. Each receiving slot 11 contains a positioning piece 20. Multiple rows of light strips 30 are fixed on the left and right sides of the back plate 10 respectively. The multiple rows of light strips 30 on the left side of the back plate 10 are fixed by one positioning piece 20; the multiple rows of light strips 30 on the right side of the back plate 10 are fixed by another positioning piece 20.

[0045] In some optional embodiments, to improve the connection stability between the positioning piece 20 and the back plate 10, the positioning piece 20 is snapped into the receiving groove 11; or, the positioning piece 20 is fixed in the receiving groove 11 by adhesive bonding.

[0046] In traditional backlight modules, the backplate 10 has positioning protrusions matching the number of LED strips 30 during manufacturing. If the number of LED strips 30 changes, the backplate 10 needs to be replaced. In other words, for backlight modules of the same size but different grades, different specifications of backplates 10 need to be manufactured to accommodate different numbers of LED strips 30. The backlight module provided in this application uses positioning pieces 20 to position the LED strips 30. For different specifications of backlight modules, only the positioning pieces 20 need to be replaced, without replacing the entire backplate 10. This allows the same backplate 10 to accommodate more LED strip 30 layout schemes. Furthermore, the backplate 10 only needs to have receiving slots 11, eliminating the need for positioning structures, resulting in a simple structure and low manufacturing cost.

[0047] In some specific embodiments, the cross-sectional area of ​​the positioning bump 21 gradually decreases from the root to the top.

[0048] Understandably, the cross-sectional area of ​​the top of the positioning protrusion 21 is smaller than the area of ​​the positioning hole 31, while the cross-sectional area of ​​the base of the positioning protrusion 21 is roughly equal to the area of ​​the positioning hole 31. If the positioning protrusion 21 has a uniform thickness from base to top, the positioning hole 31 needs to be precisely aligned with the positioning protrusion 21 when the light strip 30 is positioned using the positioning protrusion 21. If the cross-sectional area of ​​the positioning protrusion 21 gradually decreases from base to top, the light strip 30 can still be fitted onto the positioning protrusion 21 even if there is a deviation between the hole axis of the positioning hole 31 on the light strip 30 and the central axis of the positioning protrusion 21 during the assembly of the backlight module.

[0049] Optionally, the positioning hole 31 can be a circular hole or a square hole. In some optional embodiments, the positioning hole 31 is a circular hole, and the positioning protrusion 21 is frustum-shaped, making it easier to insert the frustum-shaped positioning protrusion 21 into the positioning hole 31 when the light strip 30 is positioned. In some optional embodiments, the positioning hole 31 is a circular hole, and the positioning protrusion 21 is frustum-shaped. Alternatively, the positioning hole 31 is a square hole, and the positioning protrusion 21 is a wedge-shaped block or a frustum-shaped pyramid.

[0050] In some alternative embodiments, see Figure 7 The positioning piece 20 has a through hole 22, which penetrates the positioning protrusion 21. (See reference...) Figure 6 The backlight module also includes a grounding component 40, which is inserted into the through hole 22 and contacts the light strip 30.

[0051] In traditional backlight modules, the control chip on the LED strip 30 needs to be connected to the power supply ground via a long flexible connecting cable. However, the flexible connecting cable has high resistance, resulting in a large voltage difference between the control chip interface and the power supply interface of the LED strip 30. Typically, the flexible connecting cable is 1.5m long, causing a large voltage drop between the control chip interface and the power supply interface, affecting the normal operation of the control chip. Alternatively, a grounding screw can be used in the backlight module to connect the ground signal of the control chip on the LED strip 30 to the backplane 10, and then to the power supply grounding screw on the backplane 10. This process requires screwing, which affects production efficiency.

[0052] In the backlight module provided in this application embodiment, the grounding component 40 is a conductive metal, and the positioning piece 20 is a conductive metal component. The grounding component 40 is inserted into the through hole 22 and contacts the light strip 30, thereby enabling the control chip of the light strip 30 to be connected to the back plate 10 through the grounding component 40 and the positioning piece 20, thereby realizing the grounding of the light strip 30.

[0053] In traditional backlight modules, the LED strip 30 requires a grounding hole, and the grounding hole and positioning hole 31 are independent of each other. With technological advancements, the width of the LED strip 30 is becoming increasingly narrow. For example, a highly integrated LED strip 30 may only be 12mm wide, and having both a grounding hole and a positioning hole 31 on it is not conducive to the routing of the LED strip 30's wiring. The backlight module provided in this application embodiment allows the positioning hole 31 to not only cooperate with the positioning protrusion for positioning but also serve as a mounting hole for the grounding component 40. This reduces the number of openings on the LED strip 30, providing more space for wiring and facilitating the thinning and cost reduction of the LED strip 30.

[0054] In some embodiments, see Figure 8 The grounding component 40 includes a rod 41 and a cap 42 fixed to one end of the rod 41. The rod 41 is inserted into the through hole 22, and the cap 42 is pressed onto the light strip 30.

[0055] The height of the positioning protrusion 21 does not exceed the thickness of the lamp panel 301. In some embodiments, the height of the positioning protrusion 21 is less than the thickness of the lamp panel 301, and the rod 41 is a stepped rod. The thicker end of the stepped rod is connected to the cap 42 and the thinner end of the stepped rod, respectively. The thinner end of the stepped rod is inserted into the through hole 22, so that the stepped surface of the stepped rod abuts against the end face of the positioning protrusion 21. Of course, the rod 41 can also be a cylindrical structure with uniform thickness. In some embodiments, the height of the positioning protrusion 21 is the same as the height of the lamp panel 301, and the rod 41 is a rod with uniform thickness. Alternatively, the through hole 22 is a stepped hole, and the rod 41 is a stepped rod adapted to the stepped hole.

[0056] Specifically, the grounding component 40 is rivet-shaped and interference-fits the through hole 22. The rod body 41 is a smooth rod; the cap 42 is flat and can contact the light strip 30 to constrain the depth of the rod body 41 inserted into the through hole 22. During assembly, align the rod body 41 with the through hole 22 and press the cap 42 to insert the rod body 41 into the through hole 22. Compared to grounding screws, the smooth rod body 41 can be directly pressed in without tightening, making installation convenient.

[0057] Optionally, the through hole 22 is a tapered hole, with its diameter gradually increasing along the insertion direction of the grounding member 40. During the insertion of the rod 41 into the through hole 22, the tapered hole accommodates the manufacturing errors of the rod 41, achieving an interference fit.

[0058] In some embodiments, the grounding member 40 is screw-shaped, with threads on the rod body 41 that can thread-mate with the through hole 22. During assembly, the grounding member 40 is aligned with the through hole 22 and then screwed into the through hole 22, so that the grounding member 40 connects at least the positioning piece 20 and the lamp strip 30.

[0059] The backlight module provided in this application embodiment has a grounding component 40 with a rod 41 and a cap 42. The rod 41 is inserted into the through hole 22 and the cap 42 is pressed onto the light strip 30. This improves the stability of the fit between the light strip 30 and the positioning protrusion and enables the light strip 30 to be grounded. During installation, it can be pressed down without the need for screwing, thus improving installation efficiency.

[0060] In some optional embodiments, the end of the rod 41 abuts against the back plate 10, thereby connecting the lamp strip 30 and the back plate 10 via the grounding member 40. For example, the grounding member 40 includes the rod 41 and a cap 42 fixed to one end of the rod 41, the cap 42 pressing onto the lamp strip 30, and the rod 41 inserted into the through hole 22. In some optional embodiments, there is a gap between the end of the rod 41 and the back plate 10, that is, the grounding member 40 connects the positioning piece 20 and the lamp strip 30, so that the lamp strip 30 is connected to the back plate 10 after passing through the grounding member 40 and the positioning piece 20, thereby achieving grounding.

[0061] In some alternative embodiments, the backlight module further includes an adapter plate 50 and a connector 51, with the end of the light strip 30 connected to the connector 51, the connector 51 fixed to the adapter plate 50, and the adapter plate 50 connected to the back plate 10.

[0062] like Figure 1 and Figure 2 As shown, the adapter plate 50 is fixed to the center of the back plate 10, and multiple connectors 51 are fixedly arranged along the length of the adapter plate 50. Each connector 51 connects to a light strip 30. Specifically, the connector 51 has a first interface, and the end of the light strip 30 has a second interface. The first interface and the second interface are plugged and plugged together to connect the connector 51 and the light strip 30 together, and the connector 51 is used to position the end of the light strip 30. Optionally, one of the first interface and the second interface is an electrical pin, and the other is an electrical socket.

[0063] In addition, the LED strip 30 and the backplate 10 in the backlight module can also be connected by a flexible circuit board.

[0064] like Figure 10 As shown, the backlight module includes a power board 60, which is fixed to the back plate 10 by a grounding screw 61. The power board 60 is the power control circuit and is connected to the power supply via a flexible circuit. Specifically, the power board 60 is fixed to the side of the back plate 10 away from the LED strip 30. The power board 60 has a through hole, through which the grounding screw 61 passes and connects to the back plate 10, thus achieving grounding connection between the power board 60 and the back plate 10.

[0065] In some embodiments, the backlight module further includes fixing screws that secure the power board 60 to the back plate 10. The grounding screw 61 is used solely for electrical connection between the power board 60 and the back plate 10. Specifically, the end of the grounding screw 61 abuts against the back plate 10, and the nut of the grounding screw 61 presses the power board 60 onto the back plate 10. In some embodiments, the grounding screw 61 serves to both secure the power board 60 and the back plate 10 and ground them. Specifically, the back plate 10 has fixing holes, and the grounding screw 61 passes through the through holes and fixing holes to connect the back plate 10 and the power board 60 together.

[0066] In some optional embodiments of this application, the thickness of the positioning piece 20 in the backlight module is the same as the depth of the receiving groove 11. When the positioning piece 20 is placed in the receiving groove 11, it will neither bulge outward nor be recessed, thereby enabling the positioning piece 20 to contact the light strip 30 to provide support for the light strip 30.

[0067] In some embodiments, see Figure 9 The width of the opening of the receiving groove 11 is greater than the width of the bottom of the receiving groove 11. Specifically, the cross-section of the receiving groove 11 is an isosceles trapezoid with a large opening width, which facilitates the insertion of the positioning piece 20.

[0068] In addition, this application also provides a display device, which includes a housing and a backlight module as described above. The backlight module is installed inside the housing.

[0069] The display device is an electronic device with a screen, such as a television, tablet, laptop, or mobile phone. By adopting the aforementioned backlight module, this display device can configure multiple LED strip 30 layout schemes for the same backplate 10 by changing the positioning piece 20, thereby improving the versatility of the backplate 10.

[0070] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

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