Backlight module of liquid crystal display

Abstract

The utility model discloses a liquid crystal display screen backlight unit, including frame, the inside fixed mounting of frame has the light guide plate, the clearance between light guide plate and frame installs four light source units, four the light source units are respectively in the four edges of light guide plate, the four edges of frame all are set up and install detection subassembly, the edge fixed mounting of frame has the rubber frame, the gap between the light guide plate and the frame frame of rubber frame is sealed. The utility model discloses four light source units through the series connection mode, can only through an interface just can four light source units power supply simultaneously, when the light source unit in the inside appears the breakdown, only need through the detection hole to four edge light source unit both ends of the conductive sheet detection open circuit situation in turn can detect the corresponding edge failure light source unit, will the corresponding edge sealing plate dismounts just can realize the dismounting and overhaul of this failure unit, need not to dismount the whole module.

Description

Technical Field

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

[0002] Backlight modules are an indispensable part of LCD display devices. They provide a uniform and stable light source to illuminate the screen and are widely used in devices such as televisions, mobile phones, and tablets. With technological advancements, backlight modules have evolved from early cold cathode fluorescent lamps to light-emitting diode (LED) light sources. Now, the focus is on high brightness, low energy consumption, and dynamic dimming capabilities, while also ensuring optimal integration with the LCD panel for a clearer and more appealing picture.

[0003] Edge-lit backlight modules and direct-lit backlight modules are two common types. Edge-lit modules place the light source on the side of the screen and use a light guide plate to spread the light evenly. This design makes the device thinner and cheaper, but the light utilization rate may not be high, and the edges are prone to darkening. Direct-lit modules place the light source directly under the screen and use a diffuser plate to distribute the light evenly. The screen brightness is more uniform, the contrast is higher, and local dimming can be used to improve the image level. However, this design makes the device thicker, more expensive, and the heat dissipation more complex. The choice between the two types depends on the size of the device, its purpose, and the budget.

[0004] In existing technologies, backlight modules often employ edge-lit light source designs to achieve thickness reduction. This involves placing a light source on one side of the module and using a light guide plate to reconstruct and diffuse the light path, achieving uniform light output to the LCD panel. However, single-sided lighting structures tend to result in poor uniformity of light intensity distribution, leading to uneven brightness in certain areas. To address this issue, the industry has developed improved solutions such as dual-sided opposing lighting and four-sided ring lighting, increasing the number of lateral light sources to improve light field uniformity. However, such multi-light source architectures require multiple independent interfaces (e.g., dual or quad interfaces) for electrical connection. While a series topology can reduce this to a single power supply interface, it introduces new reliability risks. If any light source fails, the entire backlight module must be disassembled and repaired, increasing maintenance difficulty and significantly reducing equipment maintainability and production yield. Utility Model Content

[0005] The purpose of this invention is to provide a liquid crystal display backlight module to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a liquid crystal display backlight module, comprising a frame, a light guide plate fixedly installed inside the frame, four light source units installed in the gap between the light guide plate and the frame, the four light source units being respectively located on the four sides of the light guide plate, installation and detection components being provided on all four sides of the frame, a glue frame fixedly installed on the edge of the frame, the glue frame sealing the gap between the light guide plate and the frame edge, and a film layer and a liquid crystal screen fixedly installed inside the frame.

[0007] As a further description of the above technical solution: the light source unit includes a housing and an FPC board disposed inside the housing. Both ends of the FPC board penetrate the housing. One end of the FPC board of one of the light source units is electrically connected to an interface, which is fixed to the side wall of the frame. The FPC boards inside multiple light source units are electrically connected in series through conductive plates.

[0008] As a further description of the above technical solution: the installation detection component includes through grooves formed on the four sides of the frame and a sealing plate disposed inside the through grooves. The two ends of the through grooves are provided with installation grooves, and the two ends of the sealing plate are threaded with fixing screws. The fixing screws are threadedly connected to the installation grooves to realize the installation of the sealing plate.

[0009] As a further description of the above technical solution: the installation detection assembly includes two detection holes opened on the four sides of the frame, the two detection holes are respectively opened at both ends of the sealing plate, and multiple detection holes are opened on one side of multiple conductive plates. A sealing component is threadedly installed inside each of the two detection holes.

[0010] As a further description of the above technical solution: the FPC board is provided with multiple soldering contact points, and LED beads are electrically soldered to each of the multiple soldering contact points.

[0011] As a further description of the above technical solution: the light source unit also includes a cover plate fixed on the housing, the cover plate having multiple through holes, and multiple LED beads being snapped into the interior of the multiple through holes.

[0012] This utility model provides a backlight module for a liquid crystal display screen. It has the following advantages: four light source units are connected in series, allowing simultaneous power supply to all four units through a single interface. When an internal light source unit malfunctions, the faulty unit can be detected by sequentially checking the conductive plates at both ends of the four side light source units for open circuits via detection holes. The faulty unit can then be disassembled and repaired by removing the sealing plate on the corresponding side, without needing to disassemble the entire module.

[0013] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0014] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a liquid crystal display backlight module proposed in this utility model;

[0016] Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the present invention;

[0017] Figure 3 This is a three-dimensional exploded structural diagram of the present invention;

[0018] Figure 4 This is a three-dimensional structural diagram of the present invention after one side of the sealing plate has been disassembled;

[0019] Figure 5 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 6 This is a three-dimensional structural diagram of the present invention after the LCD screen body, light guide plate, film layer and frame have been disassembled.

[0021] Figure 7 This is a three-dimensional structural diagram showing the electrical connection of multiple light source units according to this utility model;

[0022] Figure 8 This is a three-dimensional exploded view of a single light source unit of this utility model.

[0023] Legend:

[0024] 1. Frame; 2. LCD screen; 3. Adhesive frame; 4. Sealing plate; 5. Membrane layer; 6. Light guide plate; 7. Light source unit; 701. Housing; 702. Cover plate; 703. Through hole; 8. LED lamp bead; 9. Interface; 10. Conductive plate; 11. Fixing screw; 12. Groove; 13. Detection hole; 14. Sealing component; 15. FPC board; 16. Welding contact point. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Reference Figure 1-8A liquid crystal display backlight module includes a frame 1. A light guide plate 6 is fixedly installed inside the frame 1. Four light source units 7 are installed in the gap between the light guide plate 6 and the frame 1. The four light source units 7 are respectively located on the four sides of the light guide plate 6. Detection components are installed on all four sides of the frame 1. A glue frame 3 is fixedly installed on the edge of the frame 1 to seal the gap between the light guide plate 6 and the frame 1. A film layer 5 and a liquid crystal screen 2 are also fixedly installed inside the frame 1. The frame 1 serves as a structural base, with four light source units 7 symmetrically arranged on its four sides. After light enters through the side of the light guide plate 6, it undergoes total internal reflection and refraction through the internal microstructure of the light guide plate 6, converting the point light source into a surface light source for uniform emission. The frame 3 surrounds the edge of the frame 1, effectively preventing light leakage through physical sealing. The film layer 5 performs secondary light homogenization and brightening treatment on the light output from the light guide plate 6. Finally, the homogenized light penetrates the LCD screen 2 to achieve the display function. The above structure and working principle are existing technologies, so they will not be described in detail. The four light source units 7 are connected in series, and can be powered simultaneously through only one interface 9. When the internal light source unit 7 fails, it is only necessary to check the open circuit of the conductive sheets at both ends of the four side light source units 7 through the detection hole 13 to detect the faulty light source unit 7 on the corresponding side. The sealing plate 4 on the corresponding side can be removed to disassemble and repair the faulty unit without disassembling the entire module.

[0027] As a preferred technical solution of this embodiment, the light source unit 7 includes a housing 701 and an FPC board 15 disposed inside the housing 701. Both ends of the FPC board 15 penetrate the housing 701. One end of the FPC board 15 of one of the light source units 7 is electrically connected to an interface 9. The interface 9 is fixed on the side wall of the frame 1. The FPC boards 15 inside the multiple light source units 7 are electrically connected in series through conductive plates 10. The FPC board 15 is a flexible circuit board that can provide a series connection environment for the LED beads 8. The FPC board 15 is installed inside the housing 701, which can protect it. The multiple FPC boards 15 are connected in series through conductive plates 10, thereby realizing the series connection of the circuit.

[0028] As a preferred technical solution of this embodiment, the installation detection component includes through grooves formed on the four sides of the frame 1 and a sealing plate 4 disposed inside the through grooves. The two ends of the through grooves are provided with mounting grooves 12, and the two ends of the sealing plate 4 are threaded with fixing screws 11. The fixing screws 11 are threadedly connected to the mounting grooves 12 to realize the installation of the sealing plate 4. The sealing plate 4 can be disassembled by fixing screws 11, and the internal light source unit 7 can be pulled out from the inside of the frame 1 to realize the disassembly of the light source unit 7.

[0029] As a preferred technical solution of this embodiment, the installation detection component includes two detection holes 13 opened on the four sides of the frame 1. The two detection holes 13 are respectively opened at both ends of the sealing plate 4. Multiple detection holes 13 are opened on one side of multiple conductive plates 10. A sealing component 14 is threadedly installed inside each of the two detection holes 13. The detection head of a multimeter is inserted into the detection holes 13 at both ends of the light source unit 7 to be tested, so as to detect whether the light source unit 7 has a fault.

[0030] As a preferred technical solution in this embodiment, the FPC board 15 is provided with a plurality of soldering contact points 16, and each of the plurality of soldering contact points 16 is electrically soldered with LED beads 8; the LED beads 8 soldered on the FPC board 15 can achieve series connection.

[0031] As a preferred technical solution of this embodiment, the light source unit 7 further includes a cover plate 702 fixed on the housing 701. The cover plate 702 has a plurality of through holes 703, and the plurality of LED beads 8 are snapped into the interior of the plurality of through holes 703. The cover plate 702 can seal the housing 701, enclosing the LED beads 8 and the FPC board 15 used to fix the LED beads 8. The through holes 703 are used for the placement and illumination of the LED beads 8.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A liquid crystal display backlight module, comprising a frame (1), wherein a light guide plate (6) is fixedly installed inside the frame (1), four light source units (7) are installed in the gap between the light guide plate (6) and the frame (1), and a film layer (5) and a liquid crystal screen (2) are also fixedly installed inside the frame (1), characterized in that, The four light source units (7) are respectively located on the four sides of the light guide plate (6). The four sides of the frame (1) are provided with installation and detection components. The edge of the frame (1) is fixedly installed with a glue frame (3), which seals the gap between the light guide plate (6) and the frame (1).

2. The liquid crystal display backlight module according to claim 1, characterized in that, The light source unit (7) includes a housing (701) and an FPC board (15) disposed inside the housing (701). Both ends of the FPC board (15) penetrate the housing (701). One end of the FPC board (15) of one of the light source units (7) is electrically connected to an interface (9). The interface (9) is fixed on the side wall of the frame (1). The FPC boards (15) inside the multiple light source units (7) are electrically connected in series through conductive plates (10).

3. A liquid crystal display backlight module according to claim 1, characterized in that, The installation and testing assembly includes through slots on the four sides of the frame (1) and a sealing plate (4) inside the through slots. The two ends of the through slots are provided with mounting grooves (12). The two ends of the sealing plate (4) are threaded with fixing screws (11). The fixing screws (11) are threadedly connected to the mounting grooves (12) to realize the installation of the sealing plate (4).

4. A liquid crystal display backlight module according to claim 1, characterized in that, The installation detection assembly includes two detection holes (13) on the four sides of the frame (1), the two detection holes (13) are respectively opened at both ends of the sealing plate (4), and multiple detection holes (13) are opened on one side of multiple conductive plates (10). The two detection holes (13) are threaded with a sealing component (14) inside.

5. A liquid crystal display backlight module according to claim 2, characterized in that, The FPC board (15) is provided with multiple soldering contact points (16), and each of the multiple soldering contact points (16) is electrically soldered with LED beads (8).

6. A liquid crystal display backlight module according to claim 5, characterized in that, The light source unit (7) also includes a cover plate (702) fixed on the housing (701). The cover plate (702) has multiple through holes (703), and multiple LED beads (8) are snapped into the inside of the multiple through holes (703).

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