Backlight module for liquid crystal display screen

Abstract

The utility model discloses a backlight module for a liquid crystal display screen, and relates to the technical field of liquid crystal display screens. The device comprises a base plate, a sliding plate, a mounting seat a / b, an adjusting mechanism and an optical assembly. The base plate is slidably connected with the sliding plate through the sliding rail and the sliding groove. Mounting bases are arranged on the two sides of the sliding plate to adapt to different display screen specifications. The adjusting mechanism comprises a locking assembly and an asymmetric tooth set, and a nut is pressed to drive a bidirectional pawl to be disengaged from or engaged with the tooth set, so that stepless locking and unlocking of the sliding plate are achieved; the asymmetric tooth set is composed of mirror image special-shaped racks, and the displacement precision is improved by combining first-stage guiding of the sliding rail and second-stage sliding guiding of the side face of the bearing piece. And the optical assembly is fixed in the substrate and is separated from the mechanical adjusting structure, so that the backlight uniformity is ensured. A traditional rubber pad is replaced by three-point meshing, the problems of abrasion and aging are solved, positioning precision and stability are improved, and rapid disassembly, assembly and maintenance are supported.

Description

Technical Field

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

[0002] LCD screens are commonly used in products such as computer displays and televisions. Traditional display methods, such as CRT monitors and LED displays, are limited by their large size or high power consumption, failing to meet users' actual needs. The development of LCD technology perfectly aligns with the current trend in information products. Its advantages, such as right-angle display, low power consumption, small size, and zero radiation, allow users to enjoy the best visual environment. Therefore, LCD screens are currently the primary choice. LCD screens themselves do not emit light and require a backlight module to provide a light source.

[0003] Existing technology, such as Chinese Patent Application No. CN202220037728.1, discloses a liquid crystal display backlight assembly, including a substrate. A groove is formed on the surface of the substrate near one side, and a slider is slidably connected between the grooves. A mounting seat a is fixedly installed on one side of the slider. A mounting seat b is fixedly installed on the surface of the substrate near the bottom. Mounting holes are formed on the surfaces of both mounting seats a and b. A rubber pad is fitted on the surface of the groove. In actual use, by setting up the substrate, groove, slider, mounting seat a, mounting seat b, and mounting holes, and by adjusting mounting seat a, the substrate can be installed on displays of different sizes, improving the practicality of the substrate and facilitating its installation. Simultaneously, the rubber pad limits the position of mounting seat a, assisting in aligning the mounting holes. The operation is simple and convenient, beneficial for practical use.

[0004] The existing technology has the following defects: Although the LCD backlight assembly can achieve the adaptation and installation of the substrate on different specifications of displays, it only relies on rubber pads for rough positioning. With long-term use, the rubber pads are prone to wear and aging due to repeated friction, eventually causing positioning failure. In addition, when manually adjusting the mounting base, uneven friction distribution can easily cause alignment deviation, resulting in insufficient positioning accuracy. Therefore, there is room for improvement. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a backlight module for LCD displays. This addresses the issues in existing backlight modules where the reliance on rubber pads for coarse positioning leads to wear and aging of the rubber pads due to repeated friction over long-term use, ultimately resulting in positioning failure. Furthermore, uneven friction distribution during manual adjustment of the mounting base can cause alignment deviations, leading to insufficient positioning accuracy.

[0006] This utility model is achieved through the following technical solution:

[0007] A backlight module for a liquid crystal display includes a substrate, a sliding plate, mounting base a, mounting base b, an adjustment mechanism, and optical components. A groove is formed on the surface of the substrate, and slide rails are symmetrically arranged inside the groove. Slide rails with matching grooves are provided on both sides of the sliding plate, forming a sliding connection between the sliding plate and the substrate. Mounting bases a are symmetrically arranged on both sides of the bottom of the substrate, and mounting bases b are symmetrically arranged on both sides of the top of the sliding plate. Mounting bases a and b both have mounting holes on their surfaces. The optical components are integrated within the substrate.

[0008] Preferably, the adjustment mechanism includes a locking component and an asymmetrical gear assembly; the locking component includes a pressing nut, a bidirectional pawl, a telescopic rod, and a bearing; a screw hole is formed on the surface of the base plate, the telescopic rod passes through the screw hole and is fixedly connected to the pressing nut, and the fixed section of the telescopic rod is fixedly connected to the bidirectional pawl; the bottom of the telescopic section of the telescopic rod is rotatably mounted on the inner side of the first groove through the bearing assembly, and a return spring is provided inside the telescopic rod; a second groove is formed on the surface of the sliding plate, and the asymmetrical gear assembly is fixed in the second groove.

[0009] Preferably, the asymmetric gear set is composed of a mirror-symmetrical rack one and a rack two; the cross-sections of rack one and rack two of the asymmetric gear set are respectively "7" shaped and inverted "7" shaped, forming a symmetrical and equally deep recessed structure at the bottom of the rack.

[0010] Preferably, the slide rail and the slide groove constitute a primary guiding mechanism, and the two side planes of the bearing component are parallel to the tooth root recessed planes of rack one and rack two, forming a secondary sliding guiding mechanism.

[0011] Preferably, the optical component includes a light-emitting plate, a light guide layer, a diffuser plate, and a diffuser film; the light-emitting plate is fixed inside the substrate on the side near the first groove, and the light guide layer, the diffuser plate, and the diffuser film are sequentially stacked on the light-emitting surface of the light-emitting plate.

[0012] Preferably, the locking process of the adjustment mechanism includes the following steps:

[0013] S1. Press to unlock stage: Press down the nut to drive the telescopic rod to move axially, so that the bidirectional pawl disengages from the engagement of rack one and rack two, and the reset spring is compressed;

[0014] S2. Displacement adjustment stage: The slide plate slides along the primary guide of the slide rail / slide groove and the secondary guide of the bearing side and the tooth root gap, and adjusts the position of mounting seat a and mounting seat b simultaneously.

[0015] S3. Release and lock stage: Loosen the pressing nut, the return spring pushes the bidirectional ratchet to reset, and the deviation is corrected by the primary guide of the slide rail / slide groove and the secondary sliding fit between the side of the bearing and the root plane of the tooth. Finally, the three-point contact engagement realizes self-locking.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. By using an asymmetrical tooth group and a three-point meshing self-locking structure with a bidirectional ratchet, the traditional rubber pad limiting method is completely replaced. The ratchet tooth shape forms a geometric self-locking with the mirror working surfaces of rack one and rack two, achieving wear-free bidirectional locking, completely solving the problem of rubber pad aging and failure, and improving long-term stability.

[0018] 2. Precise adjustment is achieved through a two-stage guide system of slide rail and bearing components. The sliding fit between the slide rail and the slide groove provides primary coarse positioning, while the parallel sliding fit between the side of the bearing component and the root plane of the tooth forms secondary fine guidance, which significantly improves the final positioning accuracy and overcomes the alignment deviation caused by uneven friction during manual adjustment.

[0019] 3. Through the press-type spring reset mechanism and modular design, it realizes one-handed press-to-unlock, slide-to-adjust, and release-to-lock integrated operation, which simplifies the assembly process and supports quick replacement of worn parts, reducing maintenance costs.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the background art, the accompanying drawings used in the embodiments of this utility model or the background art will be described below.

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with this disclosure and, together with the specification, serve to illustrate the technical solutions disclosed in this utility model.

[0023] Figure 1 This is a schematic diagram of the overall structure of a backlight module for a liquid crystal display screen according to the present invention.

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 This is an exploded view of the backlight module for a liquid crystal display screen according to the present invention.

[0026] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0027] Figure 5 for Figure 3 Enlarged view of point C in the middle;

[0028] Figure 6 for Figure 3 Enlarged view at point D;

[0029] Figure 7 This is a schematic diagram of the asymmetric tooth assembly and bidirectional ratchet design and meshing in this utility model;

[0030] Figure 8 This is a schematic diagram showing the bidirectional ratchet and asymmetrical tooth assembly disengaged during pressing in this utility model.

[0031] Legend: 1. Substrate; 11. Screw hole; 12. Slide rail; 13. Groove 1; 2. Slide plate; 21. Slide groove; 22. Groove 2; 3. Mounting seat a; 4. Mounting seat b; 5. Mounting hole; 6. Adjustment mechanism; 61. Locking assembly; 611. Press nut; 612. Bidirectional pawl; 613. Telescopic rod; 614. Bearing; 62. Rack 1; 63. Rack 2; 7. Optical assembly; 71. Light-emitting plate; 72. Light guide layer; 73. Diffuser plate; 74. Diffuser film. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this utility model, it should be noted that the terms "center", "upper", and "lower" are used interchangeably.

[0035] The orientations or positional relationships indicated by terms such as "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships commonly used when the product is in use. They are only for the convenience of describing the present invention 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 the present invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0040] Example 1

[0041] Please refer to Figures 1-3 and Figure 5 A backlight module for a liquid crystal display includes a substrate 1, a sliding plate 2, a mounting base a3, a mounting base b4, mounting holes 5, an adjustment mechanism 6, and optical components 7. A groove 13 is formed on the inner side of the substrate 1 surface, and slide rails 12 are symmetrically arranged on both sides of the groove 13. The sliding plate 2 is slidably connected to the substrate 1 via the groove 13, and slide grooves 21 adapted to the slide rails 12 are symmetrically arranged on both sides of the sliding plate 2. Mounting bases a3 are symmetrically arranged on both sides of the bottom surface of the substrate 1, and mounting bases b4 are symmetrically arranged on both sides of the top surface of the sliding plate 2. Mounting holes 5 are formed on the surfaces of both mounting bases a3 and b4.

[0042] Please see Figure 1 , Figure 2 To realize the optical function of the backlight module, an optical component 7 is integrated in the substrate 1. The component includes a light-emitting plate 71, a light guide layer 72, a diffuser plate 73, and a diffuser film 74. The light-emitting plate 71 is fixed inside the substrate 1 on the side near the groove 13. The light-emitting surface is provided with the light guide layer 72, the diffuser plate 73, and the diffuser film 74 stacked in sequence. Uniform backlight output is achieved through the synergistic effect of the multi-layer optical structure.

[0043] Please see Figures 3-8To achieve precise displacement of the mounting base and solve the alignment deviation problem, the backlight assembly of this application also includes an adjustment mechanism 6. The adjustment mechanism 6 includes a locking component 61 and an asymmetrical gear assembly. The locking component 61 includes a pressing nut 611, a bidirectional ratchet 612, a telescopic rod 613, and a bearing 614. A screw hole 11 is provided on the surface of the substrate 1. The telescopic rod 613 passes through the screw hole 11 and is fixedly connected to the pressing nut 611. The bidirectional ratchet 612 is fixedly connected to the surface of its fixed section. The bidirectional ratchet 612 meshes with the asymmetrical gear assembly. The bottom of the telescopic section of the telescopic rod 613 is rotatably installed inside the groove 13 through the bearing 614. A return spring is also provided inside the telescopic rod 613. A groove 22 is also provided on the surface of the slider 2. The asymmetrical gear assembly is fixedly installed in the groove 22. The asymmetrical gear assembly structure consists of a pair of mirror-symmetrical racks, named rack 1 62 and rack 2 63, respectively. The cross-sectional shapes of both racks exhibit mirror-image "7" and inverted "7" geometric features, forming symmetrical and equally deep recesses at the bottom of the rack. This special design allows the bidirectional pawl to completely disengage from the rack when it is compressed and descends, thus unlocking the bidirectional movement function. The two racks adopt an independent configuration design, and their working surfaces are kept coplanar through precise geometric positioning to ensure stable contact of the meshing surfaces during transmission. The two side planes of the bearing component 614 are parallel to the tooth root recess plane, forming a secondary guide channel, which plays a further guiding and limiting role, ensuring that the bidirectional pawl 612 can accurately and smoothly engage with the asymmetrical gear set.

[0044] The working principle of a backlight module for a liquid crystal display screen in this application is as follows:

[0045] Press-to-unlock phase: Pressing down the nut 611 drives the telescopic rod 613 to move axially, the bidirectional pawl 612 disengages from the asymmetric tooth group, and the return spring is compressed; after the slide plate 2 is unlocked, the slide rail 12 / slide groove 21 (primary guide) and the side / tooth root clearance of the bearing 614 (secondary sliding guide) jointly constrain the lateral degree of freedom of the slide plate, ensuring the linearity of the movement trajectory. Displacement adjustment phase: While pressing down, the slide plate 2 slides, and the side of the bearing 614 of the secondary guide slides parallel to the tooth root plane, suppressing slight deviations; the relative positions of the mounting base a3 and mounting base b4 are adjusted synchronously, and the optical component 7 fixed in the substrate 1 maintains the uniformity of backlight. Release-to-lock phase: After the nut is loosened, the return spring pushes the pawl 612 to reset, the primary guide of the slide rail 12 controls the macroscopic path, and the secondary guide of the bearing 614 corrects the microscopic deviation through the sliding cooperation between the side and the tooth root plane. The pawl teeth finally engage with the rack 1 62 and rack 2 63 at three points, completing high-precision self-locking.

[0046] The asymmetrical tooth assembly and the three-point meshing self-locking structure of the bidirectional ratchet 612 completely replace the traditional rubber pad limiting method. The ratchet tooth shape and the mirror working surfaces of rack 1 62 and rack 2 63 form a geometric self-locking, achieving wear-free bidirectional locking, completely solving the problem of rubber pad aging and failure, and improving long-term stability. Precise adjustment is achieved through the two-stage guiding system of slide rail 12-bearing component 614. The sliding cooperation between slide rail 12 and slide groove 21 provides primary coarse positioning, and the parallel sliding cooperation between the side of bearing component 614 and the tooth root plane forms secondary fine guidance, which significantly improves the final positioning accuracy and overcomes the alignment deviation caused by uneven friction during manual adjustment. The push-type spring reset mechanism and modular design realize the integrated operation of single-hand push-to-unlock, sliding adjustment, and release self-locking, simplifying the assembly process and supporting quick replacement of worn parts, reducing maintenance costs.

[0047] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A backlight module for a liquid crystal display screen, characterized in that: The system includes a substrate, a sliding plate, mounting base a, mounting base b, an adjustment mechanism, and optical components. The substrate has a groove on its surface, with symmetrically arranged slide rails inside the groove. The sliding plate has grooves on both sides that mate with the slide rails, forming a sliding connection between the sliding plate and the substrate. Mounting bases a are symmetrically arranged on both sides of the bottom of the substrate, and mounting bases b are symmetrically arranged on both sides of the top of the sliding plate. Mounting bases a and b both have mounting holes on their surfaces. The optical components are integrated within the substrate. The adjustment mechanism includes a locking component and an asymmetrical gear assembly. The locking component includes a pressing nut, a bidirectional pawl, a telescopic rod, and a bearing. A screw hole is formed on the surface of the substrate, through which the telescopic rod passes and is fixedly connected to the pressing nut. The fixed section of the telescopic rod is fixed to the bidirectional pawl. A second groove is formed on the surface of the sliding plate, and the asymmetrical gear assembly is fixed within this second groove.

2. The backlight module according to claim 1, characterized in that: The bottom of the telescopic section of the telescopic rod is rotatably mounted on the inner side of the groove one via a bearing component, and a return spring is provided inside the telescopic rod.

3. The backlight module according to claim 2, characterized in that: The asymmetric gear set consists of two mirror-symmetrical racks, rack one and rack two.

4. The backlight module according to claim 3, characterized in that: The cross-sections of rack one and rack two of the asymmetrical gear set are "7" shaped and inverted "7" shaped, respectively, forming a symmetrical and equally deep recessed structure at the bottom of the rack.

5. The backlight module according to claim 3, characterized in that: The slide rail and the slide groove constitute a primary guiding mechanism. The two side planes of the bearing component are parallel to the tooth root recessed planes of rack one and rack two, forming a secondary sliding guiding mechanism.

6. The backlight module according to claim 1, characterized in that: The optical component includes a light-emitting plate, a light guide layer, a diffuser plate, and a diffuser film; the light-emitting plate is fixed inside the substrate on the side near the first groove, and the light guide layer, the diffuser plate, and the diffuser film are sequentially stacked on the light-emitting surface of the light-emitting plate.

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