A MiniLED direct-lit backlight module structure

Abstract

This invention provides a Mini LED direct-lit backlight module structure, including an LCM (Liquid Crystal Module) screen and a backlight module disposed on the back of the LCM screen. The backlight module has a lower metal frame with a cavity on its back. The backlight module includes a backlight film on the back of the LCM screen, a front-emitting Mini LED lamp group on the back of the backlight film, and a lamp board within the lower metal frame. A backlight reflective frame is fitted to the lower metal frame, positioned between the backlight film and the lamp board. The LCM screen is mounted on the front of the backlight reflective frame. The backlight reflective frame includes a base plate and a surrounding frame around the base plate. The front of the base plate is divided into lampshade areas, each with an insertion port at its bottom. The inner wall of each lampshade area forms a reflective slope. Compared with existing technologies, this Mini LED direct-lit backlight module structure, with its internal backlight reflective frame, provides both support and reflection functions, and offers a perforated positioning for film installation, reducing costs and improving assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mini LED backlight display modules, and in particular to a Mini LED direct-lit backlight module structure. Background Technology

[0002] LCD monitors, with their numerous advantages such as clear and delicate images, flicker-free operation, eye-friendly design, no radiation, low power consumption, and thinner and lighter design, have replaced traditional CRT (cathode ray tube) monitors and are highly favored by consumers. They are currently widely used in electronic watches, mobile phones, PDAs, handheld game consoles, educational devices, GPS navigators, digital cameras, digital camcorders, computer monitors, and televisions.

[0003] The current traditional LCM liquid crystal display module structure, such as Figure 1 As shown, the module includes an LCD screen 1, an upper brightness enhancement film 2, a lower brightness enhancement film 3, a diffuser film 4, a frame 5, a light guide plate 6, side-emitting LEDs 7, a flexible circuit board 8, a reflective film 9, and a lower metal frame 10. Traditional LCM (Liquid Crystal Module) displays use side-emitting LEDs. The light source strip 7 is side-lit, passing through the reflective film 9 to the light guide plate 6, diffuser film 4, lower brightness enhancement film 3, upper brightness enhancement film 2, and finally to the LCM LCD screen 1. The entire process involves planar illumination. This method inherently cannot control the brightness of individual pixels corresponding to the specific brightness of the displayed image content, resulting in deficiencies in energy saving and contrast ratio.

[0004] The latest Mini LED direct-lit backlight LCM LCD display modules distribute the Mini LED direct-lit array under the LCD screen. This places the light source directly below the LCM LCD screen, avoiding the defects of traditional side-lit LEDs. However, in this type of LCD display module, because the lamp panel is a direct-lit light source, a reflector is needed to optimize the light source effect and halo of each zone. The current conventional design separates the reflector from the frame, which brings the following drawbacks: 1) In terms of cost, two sets of injection molds are required, which is not advantageous in terms of development cost; 2) In terms of components, each additional component makes the structure more complex, affecting the product structure; 3) In terms of assembly, separating the frame and reflector increases the assembly process and processing time. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a Mini LED direct-lit backlight module structure with an internal backlight reflective frame that serves both support and reflection functions. It also provides perforated positioning conditions for film material installation, thereby reducing costs and improving assembly efficiency.

[0006] The technical solution adopted in this utility model is as follows: A Mini LED direct-lit backlight module structure includes an LCM liquid crystal display (LCD) screen and a backlight module disposed on the back of the LCM LCD screen. The back of the backlight module is provided with a lower metal frame that provides support and protection. The lower metal frame has a cavity. The backlight module includes a backlight film on the back of the LCM LCD screen, a front-emitting Mini LED lamp group on the back of the backlight film, and a lamp board for mounting the Mini LED lamp group within the lower metal frame. A backlight reflective frame is fitted to the lower metal frame and is located between the backlight film and the lamp board. The LCM LCD screen is mounted on the front of the backlight reflective frame. The backlight reflective frame includes a base plate and a surrounding frame around the base plate. The front of the base plate is divided into multiple lamp cover areas corresponding to each LED in the Mini LED lamp group. The bottom of each lamp cover area is provided with an insertion port for inserting LEDs. The inner wall of the lamp cover area forms a reflective slope for reflecting light.

[0007] Preferably, the LED beads in the Mini LED light group are arranged in N rows * M columns, and correspondingly, the lamp cover area on the backlight reflective frame is arranged in N rows * M columns, where N and M are both positive integers.

[0008] Preferably, the front side of the base plate is provided with a mounting slot for mounting the backlight film.

[0009] Preferably, the back of the base plate is provided with multiple cutouts, each cutout being located at the intersection of two adjacent lampshade areas.

[0010] More preferably, the back of the base plate is also provided with an adhesive layer, which has a plurality of first openings corresponding to each LED bead in the Mini LED light group and a plurality of second openings corresponding to the cutout.

[0011] Preferably, a hollowed-out groove is formed between the back of the base plate and the frame.

[0012] Preferably, the side wall of the enclosure is provided with a plurality of fastening openings, and the side wall of the metal frame is provided with fastening seats that cooperate with the fastening openings.

[0013] Preferably, the backlight film material includes a diffuser plate, a diffuser film, a lower brightness enhancement film and an upper brightness enhancement film stacked in sequence, with the diffuser plate located between the diffuser film and the backlight reflective frame.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a Mini LED direct-lit backlight module structure with an internal backlight reflective frame, which has both support and reflection functions, and provides perforated position conditions for film material installation and positioning, thereby reducing costs and improving assembly efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a traditional LCM liquid crystal display module.

[0016] Figure 2 This is a schematic diagram of a Mini LED direct-lit backlight module structure provided by this utility model.

[0017] Figure 3 This is an exploded view of a Mini LED direct-lit backlight module structure provided by this utility model.

[0018] Figure 4 This is a front view of the backlight reflective frame in a Mini LED direct-lit backlight module structure provided by this utility model.

[0019] Figure 5 This is a schematic diagram of the back of the backlight reflective frame in a Mini LED direct-lit backlight module structure provided by this utility model.

[0020] Figure 6 This is a cross-sectional view of the backlight reflective frame in a Mini LED direct-lit backlight module structure provided by this utility model. Detailed Implementation

[0021] The preferred embodiments of this utility model will be described in detail with reference to the accompanying drawings.

[0022] Figures 2 to 6 This invention provides a Mini LED direct-lit backlight module structure. For example... Figures 2 to 6As shown, the Mini LED direct-lit backlight module structure includes an LCM LCD screen 10 (not shown in the figure) and a backlight module 20 disposed on the back of the LCM LCD screen. A lower metal frame 30, which provides support and protection, is provided on the back of the backlight module. The lower metal frame has a cavity. The backlight module 20 includes a backlight film 21 on the back of the LCM LCD screen, a front-emitting Mini LED lamp group 22 on the back of the backlight film, and a lamp plate 23 within the lower metal frame for mounting the Mini LED lamp group. A backlight reflective frame 40 is fitted to the lower metal frame 30, positioned between the backlight film 21 and the lamp plate 23. The LCM LCD screen 10 is mounted on the front of the backlight reflective frame 40. The backlight reflective frame 40 includes a base plate 41 and a surrounding frame 42 around the base plate. The front of the base plate 41 is divided into multiple sections corresponding to the Mini LED lamp group. Each LED bead in the LED light group 22 has a corresponding lampshade area 411. The bottom of each lampshade area 411 has an insertion port 4111 for inserting the LED bead. The inner wall of the lampshade area 411 forms a reflective slope 4112 for reflecting light. Thus, in the Mini LED direct-lit backlight module structure, a backlight reflective frame 40 is provided inside, which cooperates with the lower metal frame 30 to provide support. Each LED bead in the Mini LED light group is inserted into the lampshade area 411, and the light is reflected by the reflective slope 4112 inside the lampshade area 411. The backlight film 21 is placed on the front of the backlight reflective frame 40, providing a perforated position for the film installation and positioning, reducing costs and improving assembly efficiency.

[0023] The Mini LED light group 22 has LED beads arranged in N rows * M columns, and correspondingly, the lampshade area 411 on the backlight reflective frame 40 is arranged in N rows * M columns, where N and M are both positive integers. Figure 4 As shown, each lampshade area 411 is similar to a square bucket shape, and four inclined reflective slopes 4112 are formed inside the lampshade area 411 to facilitate the reflection of light.

[0024] The base plate 41 has a mounting slot 412 on its front side for mounting the backlight film 21. The backlight film 21 includes a diffuser plate 211, a diffuser film 212, a lower brightness enhancement film 23, and an upper brightness enhancement film 214 stacked sequentially. The diffuser plate 211 is located between the diffuser film 212 and the backlight reflective frame 40. The bottom edges of the diffuser film 212, the lower brightness enhancement film 23, and the upper brightness enhancement film 214 extend to form extensions that can be directly mounted in the mounting slot 412 on the base plate 41. The front side of the upper brightness enhancement film 214 is also provided with a light-shielding rubber ring 215.

[0025] The back of the base plate 41 is also provided with multiple cutouts 413. Each cutout 413 is located at the intersection of two adjacent lampshade areas 411. Adding cutouts 413 at the intersection of lampshade areas 411 can appropriately release shrinkage stress and reduce stress-induced deformation. The design depth of the cutouts 413 is determined by the minimum molding thickness of 0.5mm (min) and the actual product strength. The cutouts 413 are set at the intersection of each section because the stress is the greatest at these locations. In order to position the lamp panel 23, the back of the base plate 41 is also provided with a first adhesive layer 415. The adhesive layer 415 is used to position the lamp panel 23 on the back of the base plate 41. The adhesive layer 415 has multiple first openings corresponding to each lamp bead in the Mini LED lamp group 22 and multiple second openings corresponding to the cutouts 413. In this way, each lamp bead passes through the opening and is inserted into the insertion slot 4111 of the base plate 41. Meanwhile, a second double-sided adhesive layer 231 is provided on the back of the light panel 23 to position the light panel 23 within the lower metal frame 30.

[0026] A recessed groove 414 is formed between the back of the base plate 41 and the frame 42. During injection molding, the glue thickness at the joint between the base plate 41 and the frame 42 is very thick, which may cause shrinkage. To prevent shrinkage, a recessed groove 414 is formed between the base plate 41 and the frame 42. The thickness of the recessed groove 414 is based on the thickness of the glue frame retaining wall of 1mm, while also taking into account strength and balancing local thickness differences.

[0027] The backlight reflective frame 40 integrates the light frame and reflective lamp cover into a single injection molded part, enabling one-time injection molding with a single mold, reducing the number of structural components and injection molds. Hollows 413 and grooves 414 are designed on the back of the base plate 41 and the surrounding frame 42 to balance local thickness differences, reduce shrinkage defects caused by uneven cooling, and prevent deformation caused by residual stress. Adjusting the injection molding parameters of the injection molding machine solves the injection flow problem for products with larger structures.

[0028] The side wall of the enclosure 42 is provided with a plurality of fastening openings 421, and the side wall of the metal frame 30 is provided with fastening seats 31 that cooperate with the fastening openings. When they are engaged, the enclosure 42 is fitted onto the metal frame 30, and the fastening seats 31 are located in the corresponding fastening openings 421.

[0029] In summary, the technical solution of this utility model can fully and effectively achieve the aforementioned objectives. Furthermore, the structure and functional principles of this utility model have been fully verified in the embodiments, achieving the expected effects and objectives. Without departing from the principles and essence of this utility model, various changes or modifications can be made to the embodiments. Therefore, this utility model includes all substitutions within the scope mentioned in the patent application claims, and any equivalent changes made within the scope of this patent application are within the scope of the patent application.

Claims

1. A Mini LED direct-lit backlight module structure, comprising an LCM liquid crystal display (LCD) screen and a backlight module disposed on the back of the LCM LCD screen, wherein the back of the backlight module is provided with a lower metal frame for support and protection, and the lower metal frame has a cavity, characterized in that, The backlight module includes a backlight film on the back of the LCM LCD screen, a front-emitting MiniLED lamp group on the back of the backlight film, and a lamp board for mounting the MiniLED lamp group inside the lower metal frame. The lower metal frame is fitted with a backlight reflective frame, which is located between the backlight film and the lamp board. The LCM LCD screen is installed on the front of the backlight reflective frame. The backlight reflective frame includes a base plate and a surrounding frame around the base plate. The front of the base plate is divided into multiple lampshade areas corresponding to each lamp bead in the Mini LED lamp group. The bottom of each lampshade area is provided with an insertion port for inserting the lamp bead. The inner wall of the lampshade area forms a reflective slope for reflecting light.

2. The Mini LED direct-lit backlight module structure according to claim 1, characterized in that: In the Mini LED light assembly, the LED beads are arranged in N rows and M columns. Correspondingly, the lamp cover area on the backlight reflective frame is arranged in N rows and M columns, where N and M are both positive integers.

3. The Mini LED direct-lit backlight module structure according to claim 1, characterized in that: The base plate has a mounting slot on its front side for mounting the backlight film.

4. The Mini LED direct-lit backlight module structure according to claim 1, characterized in that: The back of the base plate is also provided with multiple cutouts, each cutout being located at the intersection of two adjacent lampshade areas.

5. The Mini LED direct-lit backlight module structure according to claim 4, characterized in that: The back of the base plate is also provided with an adhesive layer, which has multiple first openings corresponding to each LED bead in the Mini LED light group and multiple second openings corresponding to the cutout.

6. The Mini LED direct-lit backlight module structure according to claim 1, characterized in that: A hollowed-out groove is also formed between the back of the base plate and the frame.

7. The Mini LED direct-lit backlight module structure according to claim 1, characterized in that: The side wall of the enclosure is provided with multiple fastening openings, and the side wall of the metal frame is provided with fastening seats that cooperate with the fastening openings.

8. The Mini LED direct-lit backlight module structure according to claim 1, characterized in that: The backlight film material includes a diffuser plate, a diffuser film, a lower brightness enhancement film, and an upper brightness enhancement film stacked in sequence, with the diffuser plate located between the diffuser film and the backlight reflective frame.

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