Novel backlight module

Abstract

The utility model relates to the technical field of backlight modules, and particularly discloses a novel backlight module which is characterized in that a diffusion film is arranged in a back plate, a brightness enhancement film is arranged at one end, close to the diffusion film, in the back plate, a diffusion type brightness enhancement film is arranged at one end, close to the brightness enhancement film, in the back plate, and a stepped mounting groove is formed in the back plate; when the diffusion film, the brightness enhancement film and the diffusion type brightness enhancement film are installed, the protruding blocks on one sides of the surfaces of the diffusion film, the brightness enhancement film and the diffusion type brightness enhancement film are matched with the stepped installation groove of the back plate, the positioning lugs at the lower ends of the protruding blocks are matched with the limiting groove, and the diffusion film, the brightness enhancement film and the diffusion type brightness enhancement film are staggered and located at the same vertical position. According to the mode, the use of the adhesive tape is reduced, the positioning is convenient, the working efficiency is improved, the cost is reduced, the film material can be prevented from being polluted and abraded, and the problems of white spots, size thickening, bad lamp shadows and the like are reduced.

Description

Technical Field

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

[0002] Backlight modules are primarily used in LCD display devices, such as computer monitors, mobile phone screens, and television screens, to provide a uniform backlight for the LCD panel, enabling the LCD to display images and text information correctly. In the field of modern display technology, with the increasing demands for image quality, thinness, and energy efficiency in display devices, the performance and quality of backlight modules play a crucial role in the overall display system's performance. By collecting, guiding, and diffusing the light emitted from the light source, it uniformly illuminates the LCD panel, thereby presenting a clear and bright image. Currently, backlight modules typically require the following technologies in practical applications:

[0003] 1. High-efficiency light source technology: Employing light sources with high luminous efficiency and long lifespan, such as LEDs, to provide sufficient and stable brightness to meet the brightness requirements of different display devices. Simultaneously, precise control of the light source's color consistency and color temperature is necessary to ensure accurate color display.

[0004] 2. Optical Design Technology: By rationally designing the structure and parameters of optical components such as light guide plates, reflective sheets, and diffuser sheets, uniform light diffusion and efficient utilization can be achieved, reducing uneven brightness and improving the quality of the displayed image.

[0005] Currently, various technical solutions and product forms are employed to achieve the functionality of backlight modules. Some backlight modules use a direct-lit design, placing the LED chips directly below the LCD panel and using optical components such as reflectors and diffusers to homogenize the light. This design offers high brightness and contrast but is relatively thick. Others use an edge-lit design, placing the LED chips on the side of a light guide plate, which guides the light to the entire panel, achieving a thinner profile. However, this may require more refined optical design to ensure brightness uniformity. Furthermore, some high-end backlight modules utilize local dimming technology, dividing the backlight into multiple independent dimming zones. The brightness of different zones is independently adjusted according to the displayed content, significantly improving contrast and image depth.

[0006] However, the existing backlight module technologies and products still have a prominent problem: the current common method of fixing the backlight modules by applying tape between the films is to directly adhere the tape to the film surface. The tape has the function of guiding or absorbing light, which makes the backlight module prone to problems such as light spots or dark areas when it is working. When the tape guides light, it will cause the light in some areas to be too strong, forming light spots. When the tape absorbs light, it will cause the light in the corresponding areas to be weakened, resulting in dark areas. These phenomena will reduce the uniformity and stability of the displayed image and affect the user's viewing experience. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a novel backlight module that solves the problem of the commonly used method of fixing backlight modules by applying tape between films. The tape is directly applied to the film surface, and while the tape has light-guiding or light-absorbing properties, this can easily lead to problems such as light spots or dark areas during operation. When the tape guides light, it can cause excessive light in localized areas, forming light spots; conversely, when the tape absorbs light, it can cause light to weaken in the corresponding areas, resulting in dark areas. These phenomena reduce the uniformity and stability of the displayed image, affecting the user's viewing experience.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A novel backlight module includes a backplate, a diffusion film disposed inside the backplate, a brightness enhancement film disposed at one end of the backplate near the diffusion film, and a diffusion-type brightness enhancement film disposed at one end of the backplate near the brightness enhancement film. A stepped mounting groove is formed inside the backplate, and the diffusion film, brightness enhancement film, and diffusion-type brightness enhancement film are all disposed inside the stepped mounting groove. A limiting groove is formed inside the backplate, and the diffusion film, brightness enhancement film, and diffusion-type brightness enhancement film are all disposed inside the limiting groove.

[0010] Preferably, the inner surface of the back plate is provided with a boss, the back plate is provided with a light guide plate body inside the back plate, and the diffusion film is provided on the outer surface of the light guide plate body at the end away from the back plate.

[0011] Preferably, the light guide plate body has a groove inside, the groove and the boss are adapted to each other, and the inner surface of the back plate is provided with a light guide plate limiting rubber pad.

[0012] Preferably, the back plate is equipped with an LED light source, and the light guide plate body and the LED light source are flush.

[0013] Preferably, a reflective sheet is provided inside the back plate, and the reflective sheet is disposed on the bottom surface of the back plate cavity.

[0014] Preferably, the inner surface of the back plate is provided with a light guide plate limiting rubber pad, and the front frame is provided on the outer surface of the light guide plate limiting rubber pad.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. When installing diffusion film, brightness enhancement film, and diffusion-type brightness enhancement film, the protrusion on one side of their surface should match the stepped mounting groove of the back plate, and the positioning ear at the lower end should match the limiting groove. The three should be staggered and placed in the same vertical position, and then installed into the groove in sequence. Only the side near the light source should be covered with tape. This method reduces the use of tape, facilitates positioning, improves work efficiency, reduces costs, and can also avoid dirt and abrasion on the film material, as well as reduce problems such as white spots, thickening of dimensions, and poor light shadows.

[0017] 2. During the installation of the light guide plate body, the grooves inside the light guide plate body and the protrusions integrally formed on the surface of the back plate are matched, and the light guide plate limiting rubber pads are located on both sides of the installation position of the light guide plate body. The protrusions and the light guide plate limiting rubber pads on both sides play a central assembly role. The light guide plate body eliminates the light-emitting surface protrusion design, which helps to adopt light plate hot pressing molding, reduce injection molding mold opening, change from injection molding to hot pressing molding, improve the performance stability of the light guide plate and greatly reduce the mold opening cost. Attached Figure Description

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0019] Figure 1 This is an exploded view of the LED light source connection of this utility model;

[0020] Figure 2 This is a structural diagram of the backplate of this utility model;

[0021] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is a structural diagram of the diffusion-type brightness enhancement film of this utility model;

[0023] Figure 5 This is a diagram of the stepped mounting groove connection structure of this utility model;

[0024] Figure 6 For the present utility model Figure 5 Enlarged view at point B in the middle;

[0025] Figure 7 This is a structural diagram of the light guide plate body of this utility model;

[0026] Figure 8 This is a diagram of the boss connection structure of this utility model.

[0027] Legend: 11. Back plate; 12. Light guide plate limiting rubber pad; 13. LED light source; 14. Reflector; 15. Light guide plate body; 16. Diffuser film; 17. Brightness enhancement film; 18. Diffuser type brightness enhancement film; 19. Front frame; 21. Limiting groove; 22. Stepped mounting groove; 23. Groove; 24. Boss. Detailed Implementation

[0028] This application provides a novel backlight module that effectively solves the problem of the commonly used method of fixing backlight modules by applying tape between films. The tape is directly applied to the film surface, and while it has light-guiding or light-absorbing properties, this can easily lead to light spots or dark areas during operation. When the tape guides light, it can cause excessive light in localized areas, forming light spots; conversely, when the tape absorbs light, it can weaken the light in corresponding areas, resulting in dark areas. Both of these phenomena reduce the uniformity and stability of the displayed image, affecting the user's viewing experience. When installing diffusion films, brightness enhancement films, and diffusion-type brightness enhancement films, the protrusions on one side of their surfaces are adapted to the stepped mounting grooves on the backplate, and the lower positioning ears are adapted to the limiting grooves. All three are staggered and positioned vertically, and are sequentially installed into the grooves. Tape is only applied to the side closest to the light source. This method reduces tape usage, facilitates positioning, improves work efficiency, reduces costs, and also avoids film contamination and abrasion, reducing problems such as white spots, increased thickness, and poor lighting.

[0029] Example

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the technical solution in this application embodiment effectively solves the current common method of fixing films by applying tape between them. The tape is directly applied to the film surface, and while the tape has light-guiding or light-absorbing properties, this can easily cause light spots or dark areas to appear in the backlight module during operation. When the tape guides light, it can cause excessive light in local areas, forming light spots; conversely, when the tape absorbs light, it can cause light to weaken in the corresponding areas, resulting in dark areas. These phenomena reduce the uniformity and stability of the displayed image, affecting the user's viewing experience. The overall approach is as follows: A... The novel backlight module includes a backplate 11, inside which a diffusion film 16 is disposed. A brightness enhancement film 17 is disposed near one end of the backplate 11 adjacent to the diffusion film 16, and a diffusion-type brightness enhancement film 18 is disposed near one end of the backplate 11 adjacent to the brightness enhancement film 17. A stepped mounting groove 22 is formed inside the backplate 11, and the diffusion film 16, brightness enhancement film 17, and diffusion-type brightness enhancement film 18 are all disposed within the stepped mounting groove 22. A limiting groove 21 is formed inside the backplate 11, and the diffusion film 16, brightness enhancement film 17, and diffusion-type brightness enhancement film 18 are all disposed within the limiting groove 21. The diffusion film 16... 6. During the installation of the brightness enhancement film 17 and the diffusion-type brightness enhancement film 18, one side of the surface of the diffusion film 16, the brightness enhancement film 17, and the diffusion-type brightness enhancement film 18 has a protruding design, resembling a bump. This bump is compatible with the stepped mounting groove 22 in the back plate 11. The diffusion film 16, the brightness enhancement film 17, and the diffusion-type brightness enhancement film 18 are staggered, meaning they are all positioned at the same vertical position. The diffusion film 16, the brightness enhancement film 17, and the diffusion-type brightness enhancement film 18 are sequentially installed in the stepped mounting groove 22 and then installed using adhesive tape. The tape is fixed close to the light source side. 6. Both the brightness enhancement film 17 and the diffusion-type brightness enhancement film 18 are equipped with positioning ears at their lower ends. The positioning ears are compatible with the limiting groove 21. During installation and positioning, simply align the positioning ears with the limiting groove 21. This reduces the amount of tape used and facilitates positioning operations, thereby improving work efficiency and reducing costs. At the same time, the tape application in the middle of the film reduces the amount of dirt and abrasion caused by personnel. It also reduces the formation of white spots on the light guide side of the tape, reduces the thickness of the film in the middle area due to tape application, and increases the gap between the middle of the film and the light strip, which helps to reduce the phenomenon of poor light shadows.

[0031] The inner surface of the back plate 11 is provided with a boss 24, and the back plate 11 is provided with a light guide plate body 15. The diffusion film 16 is provided on the outer surface of the light guide plate body 15 away from the back plate 11. The light guide plate body 15 is provided with a groove 23, which is adapted to the boss 24. When the light guide plate body 15 is installed, the groove 23 in the light guide plate body 15 is adapted to the boss 24 integrally formed on the surface of the back plate 11. The light guide plate limiting rubber pads 12 are located on both sides of the installation position of the light guide plate body 15. The boss 24 and the light guide plate limiting rubber pads 12 on both sides play a central assembly role. The light guide plate body 15 eliminates the light-emitting surface protrusion design, which helps to adopt light plate hot pressing molding, reduce injection molding mold opening, change from injection molding to hot pressing molding, improve the performance stability of the light guide plate and greatly reduce the mold opening cost.

[0032] A light guide plate limiting rubber pad is provided on the inner surface of the back plate 11. An LED light source 13 is provided inside the back plate 11. The light guide plate body 15 and the LED light source 13 are flush. A reflective sheet 14 is provided inside the back plate 11 and is located on the bottom surface of the cavity of the back plate 11. A light guide plate limiting rubber pad 12 is provided on the inner surface of the back plate 11. A front frame 19 is located on the outer surface of the light guide plate limiting rubber pad 12. The backlight module consists of a back plate 11, an LED light source 13, a reflective sheet 14, a light guide plate body 15, a diffusion film 16, a brightness enhancement film 17, a diffusion-type brightness enhancement film 18, and a front frame 19. The LED light source 13 is located on the side of the back plate 11 to provide light. The reflective sheet 14 is located on the bottom surface of the cavity of the back plate 11 and its function is to provide light. The light guide plate transmits light and returns it, improving the utilization rate of light. The light guide plate body 15 is flush with the LED light source 13 and is set above the reflective sheet 14. Its function is to change the point light source into a surface light source. The diffuser film 16 is set above the light guide plate body 15. Its function is to shield and diffuse light, and increase uniformity. The brightness enhancement film 17 is located above the diffuser film 16 and plays a light-focusing role, improving the center brightness. The diffuser-type brightness enhancement film 18 is set above the brightness enhancement film 17 to improve the utilization rate of light and the uniformity of the image. The front frame 19 is set above the diffuser-type brightness enhancement film 18. The front frame 19 is fixed to the back plate 11 by the light guide plate limiting rubber pad 12, playing a connecting role, fixing the lower optical material and supporting the upper LCD panel.

[0033] To address the problems existing in the prior art, this utility model provides a novel backlight module. When installing the diffusion film 16, the brightness enhancement film 17, and the diffusion-type brightness enhancement film 18, the protrusions on one side of their surfaces are adapted to the stepped mounting groove 22 of the back plate 11, and the lower positioning ears are adapted to the limiting groove 21. The three are staggered and located in the same vertical position, and are installed into the groove in sequence. Only the side near the light source is covered with tape. This method reduces the use of tape, facilitates positioning, improves work efficiency, reduces costs, and can also avoid dirt and abrasion on the film material, reduce white spots, thickening of size, and poor light shadows.

[0034] Backplate 11: As the basic support structure of the entire backlight module, it provides installation space and fixing position for other components, and builds a stable frame structure for the entire backlight module;

[0035] Light guide plate limiting rubber pad 12: plays a central positioning role for the light guide plate body 15, ensuring the accurate installation position of the light guide plate body 15 and ensuring the stability of the optical performance of the backlight module; in addition, the front frame 19 is fixed to the back plate 11 by the light guide plate limiting rubber pad 12. While fixing the front frame 19, the light guide plate limiting rubber pad 12 also helps to buffer the force between the front frame 19 and the back plate 11, protecting the internal optical components.

[0036] LED light source 13: Located on the side of the back panel 11, it serves as the light source provider for the backlight module, emitting light to provide basic illumination for the entire display system. After being processed by other optical components, the emitted light finally illuminates the LCD panel to achieve image display.

[0037] Reflector 14: Set on the bottom surface of the cavity of the back panel 11, its main function is to reflect the light transmitted through the light guide plate back to the light guide plate, improve the light utilization rate, allow more light to participate in the display process, and prevent light from being lost in the direction of the back panel 11, thereby improving the luminous efficiency of the entire backlight module.

[0038] The light guide plate body 15 is flush with the LED light source 13 and positioned above the reflective sheet 14. Its core function is to convert the point light source emitted by the LED light source 13 into a surface light source, so that the light is distributed more evenly.

[0039] The diffuser film 16 serves two purposes: firstly, it shields areas of uneven light distribution that may exist on the light guide plate body 15; secondly, it further diffuses the light output from the light guide plate, increasing the uniformity of light distribution and making the final emitted light softer and more uniform in illuminating the LCD panel. The protrusion on one side of its surface is adapted to the stepped mounting groove 22 of the back plate 11, and the positioning ear at the lower end is adapted to the limiting groove 21, which facilitates installation and positioning. Furthermore, the specific tape application method reduces dirt, abrasion, and other adverse phenomena caused by the tape.

[0040] Brightness enhancement film 17: Located above the diffusion film 16, it mainly functions to focus light, gather the diffused light, enhance the center brightness, make the central area of ​​the display screen brighter, enhance the visual effect, and improve the sense of layering and clarity of the image.

[0041] Diffusion-type brightness enhancement film 18: Based on the brightness enhancement film 17, which focuses light to improve brightness, it further diffuses and optimizes the light, making the light distribution more uniform throughout the display area, while improving the light utilization efficiency and reducing light loss, thereby improving the display quality of the entire screen; its installation method is similar to that of diffusion film 16 and brightness enhancement film 17, and it achieves efficient installation and reduces related problems by cooperating with the corresponding structure on the back plate 11.

[0042] Front frame 19: On the one hand, it fixes the optical materials such as the diffuser film 16, the brightness enhancement film 17, and the diffuser-type brightness enhancement film 18 below to ensure their stable position during operation. On the other hand, it supports the liquid crystal panel above, provides support for the liquid crystal panel, and ensures the integrity and stability of the entire display system structure.

[0043] The stepped mounting groove 22 is adapted to the protruding design of a similar bump on one side of the surface of the diffusion film 16, the brightness enhancement film 17, and the diffusion-type brightness enhancement film 18. It provides a positioning structure for the installation of these three films, so that the films can be accurately installed in the back plate 11 in sequence and staggered from each other in the same vertical position. This facilitates the installation operation and ensures the accuracy of the film installation position, thereby ensuring optical performance.

[0044] Limiting groove 21: The positioning ear adapter is set at the lower end of the diffusion film 16, the brightness enhancement film 17, and the diffusion-type brightness enhancement film 18 to assist in the installation and positioning of the film, further improve the accuracy and convenience of installation, and at the same time reduce the amount of tape used and improve work efficiency;

[0045] The boss 24, together with the light guide plate limiting rubber pad 12, plays a central assembly role for the light guide plate body 15, ensuring the installation position accuracy of the light guide plate body 15 in the back plate 11, thereby ensuring the stability of the overall optical performance of the backlight module.

[0046] Groove 23: works with the light guide plate limiting rubber pad 12 to achieve accurate installation and positioning of the light guide plate body 15 in the back plate 11, ensuring the positional accuracy of the light guide plate body 15 in the backlight module, so as to realize its function of converting point light source into surface light source.

[0047] Working principle:

[0048] The first step involves a backlight module comprising a backplate 11, an LED light source 13, a reflective sheet 14, a light guide plate body 15, a diffusion film 16, a brightness enhancement film 17, a diffusion-type brightness enhancement film 18, and a front frame 19. The LED light source 13 is positioned on the side of the backplate 11 to provide the light source. The reflective sheet 14 is positioned on the bottom surface of the cavity of the backplate 11, its function being to allow light transmitted through the light guide plate to return, thus improving light utilization. The light guide plate body 15 is flush with the LED light source 13 and positioned above the reflective sheet 14, its function being to transform the point light source into a surface light source. The diffuser film 16 is disposed above the light guide plate body 15, and its function is to shield and diffuse light, and increase uniformity. The brightness enhancement film 17 is located above the diffuser film 16, and its function is to focus light and enhance the center brightness. The diffuser-type brightness enhancement film 18 is disposed above the brightness enhancement film 17, and its function is to improve the light utilization rate and screen uniformity. The front frame 19 is disposed above the diffuser-type brightness enhancement film 18. The front frame 19 is fixed to the back plate 11 by the light guide plate limiting rubber pad 12, and its function is to connect the upper and lower parts, fix the lower optical material and support the upper liquid crystal panel.

[0049] The second step involves installing the diffusion film 16, the brightness enhancement film 17, and the diffusion-type brightness enhancement film 18. Each of these films has a protruding design on one side, resembling a raised bump. This bump mates with the stepped mounting groove 22 in the backplate 11. The diffusion film 16, brightness enhancement film 17, and diffusion-type brightness enhancement film 18 are staggered, meaning they are all positioned at the same vertical level. They are then sequentially installed in the stepped mounting groove 22 and secured with adhesive tape. The tape is positioned close to the light source. Each of the diffusion film 16, brightness enhancement film 17, and diffusion-type brightness enhancement film 18 has a positioning ear at its lower end, which mates with the limiting groove 21. During installation, the positioning ear is aligned with the limiting groove 21. This reduces the amount of tape used and facilitates the positioning operation, thereby improving efficiency. This improves work efficiency and reduces costs. The tape application process in the middle of the membrane reduces the amount of work that causes dirt and abrasion on the membrane material. It also reduces the formation of white spots on the light guide side due to tape application, minimizes the thickness increase in the middle area of ​​the membrane material caused by tape application, and increases the gap between the membrane material and the light strip, helping to reduce poor light shadows. During the installation of the light guide plate body 15, the groove 23 inside the light guide plate body 15 matches the integrally formed boss 24 on the surface of the back plate 11. The light guide plate limiting rubber pads 12 are located on both sides of the installation position of the light guide plate body 15. The boss 24 and the two side light guide plate limiting rubber pads 12 play a central assembly role. The elimination of the light-emitting surface protrusion design in the light guide plate body 15 facilitates the use of thermoforming, reducing the need for injection molding. Changing from injection molding to thermoforming improves the stability of the light guide plate performance and significantly reduces mold costs.

[0050] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A novel backlight module, comprising a back plate (11), a diffusion film (16) is arranged inside the back plate (11), a brightness enhancement film (17) is arranged inside the back plate (11) near one end of the diffusion film (16), and a diffusion type brightness enhancement film (18) is arranged inside the back plate (11) near one end of the brightness enhancement film (17), characterized in that, The backboard (11) is internally provided with a stepped mounting groove (22), the diffusion film (16), the brightness enhancement film (17) and the diffusion type brightness enhancement film (18) are arranged in the stepped mounting groove (22), and the backboard (11) is internally provided with a limiting groove (21). The diffusion film (16), the brightness enhancement film (17) and the diffusion type brightness enhancement film (18) are arranged in the limiting groove (21).

2. The novel backlight module according to claim 1, characterized in that, The inner surface of the backboard (11) is provided with a boss (24). The backboard (11) is internally provided with a light guide plate body (15), and the diffusion film (16) is arranged at one end of the outer surface of the light guide plate body (15) away from the backboard (11).

3. The novel backlight module according to claim 2, characterized in that, The light guide plate body (15) is internally provided with a groove (23), and the groove (23) is matched with the boss (24). The inner surface of the backboard (11) is provided with a light guide plate limiting rubber pad.

4. The novel backlight module according to claim 3, characterized in that, The backboard (11) is internally provided with an LED light source (13). The light guide plate body (15) and the LED light source (13) are flush.

5. The novel backlight module according to claim 4, characterized in that, The backboard (11) is internally provided with a reflecting sheet (14). The reflecting sheet (14) is arranged on the bottom surface of the cavity of the backboard (11).

6. The novel backlight module according to claim 5, characterized in that, The inner surface of the backboard (11) is provided with a light guide plate limiting rubber pad (12). The front frame (19) is arranged on the outer surface of the light guide plate limiting rubber pad (12).

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