Direct type backlight module and liquid crystal display device

Abstract

The utility model relates to a direct type backlight module and a liquid crystal display device. The direct type backlight module comprises a light source assembly and an optical film assembly, the light source assembly comprises a substrate and a plurality of light-emitting parts, and the light-emitting parts are arranged on the substrate in an array mode and used for emitting light. The optical film assembly comprises a diffusion film, and the diffusion film is arranged on the light-emitting side of the light-emitting part and is parallel to and opposite to the substrate. The diffusion film is provided with a first diffusion surface and a second diffusion surface, the first diffusion surface faces the light-emitting part, and the second diffusion surface deviates from the light-emitting part; the first diffusion surface is provided with a first frosted area and a second frosted area, the first frosted area is used for diffusing light rays in an area with relatively high light intensity, and the second frosted area is used for diffusing light rays in an area with relatively low light intensity. According to the backlight module, an area light source with high brightness and more ideal uniformity can be obtained without additionally arranging components, and the cost and the thickness of the backlight module can be well controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of displays, and particularly to a direct-lit backlight module and a liquid crystal display device. Background Art

[0002] Liquid crystal display devices have many advantages such as being thin, light, and having low power consumption, and are widely used in smart phones, tablets, televisions, computer screens, etc. Most of the existing liquid crystal display devices are backlight type liquid crystal display devices, which mainly include an outer housing, a liquid crystal panel disposed in the outer housing, a backlight module, etc. Among them, the backlight module is one of the key components of the liquid crystal display device, providing light sources for the entire liquid crystal display.

[0003] The backlight module is divided into a side-lit backlight module and a direct-lit backlight module according to the different installation positions of the light sources. The side-lit backlight module is to arrange the light-emitting devices at the edge of the light guide plate disposed on the back of the liquid crystal panel. The light emitted by the light-emitting devices enters the light guide plate from the side of the light guide plate, and after reflection and diffusion, it is emitted from the light-emitting surface of the light guide plate, and then passes through the optical film group to form a surface light source to be provided to the liquid crystal panel. However, the side-lit backlight has the disadvantage of insufficient brightness. The direct-lit backlight module directly arranges a plurality of light-emitting devices on the back of the liquid crystal panel, without the need to arrange a light guide plate, and directly forms a surface light source to be provided to the liquid crystal panel only after passing through a diffusion film, which has higher brightness compared with the side-lit type. However, for the existing direct-lit backlight module, the uniformity of the formed outgoing surface light source is either not ideal or additional auxiliary light sources or other components need to be added, which undoubtedly increases the manufacturing cost and increases the thickness of the entire backlight module. Summary of the Utility Model

[0004] Based on this, the purpose of the present utility model is to provide a direct-lit backlight module. By providing a double diffusion surface, namely a first diffusion surface and a second diffusion surface, on a diffusion film, double diffusion is realized to obtain a uniform surface light source while reducing the thickness of the backlight module. At the same time, different frosted areas are set on the first diffusion surface according to the intensity distribution of the light transmitted from the light-emitting component to the first diffusion surface, so as to further obtain a surface light source with more ideal uniformity; moreover, no additional components are required, and the cost and the thickness of the backlight module can be well controlled.

[0005] Another object of the present utility model is to provide a liquid crystal display device. By providing a double diffusion surface, namely a first diffusion surface and a second diffusion surface, on a diffusion film, double diffusion is achieved to obtain a uniform surface light source while reducing the thickness of the backlight module. At the same time, different matte areas are set in sub-regions on the first diffusion surface according to the intensity distribution of the light transmitted to the first diffusion surface from the light-emitting components, so as to further obtain a surface light source with more ideal uniformity, thereby improving the display performance of the liquid crystal display device; moreover, no additional components are required, and the cost and thickness of the backlight module can be well controlled, and then the cost and overall thickness of the entire liquid crystal display device can be controlled.

[0006] A direct-lit backlight module, comprising:

[0007] A light source component and an optical film component;

[0008] The light source component includes a substrate and a plurality of light-emitting components. The plurality of light-emitting components are arranged in an array on the substrate, and the plurality of light-emitting components are used for emitting light;

[0009] The optical film component includes a diffusion film. The diffusion film is disposed on the light-emitting side of the light-emitting components and is disposed parallel and opposite to the substrate;

[0010] The diffusion film is provided with a first diffusion surface and a second diffusion surface. The first diffusion surface faces the light-emitting components, and the second diffusion surface faces away from the light-emitting components; the first diffusion surface is provided with a first matte area and a second matte area. The first matte area is used for diffusing the light in the area with stronger light intensity, and the second matte area is used for diffusing the light in the area with weaker light intensity.

[0011] Further, a plurality of uniformly distributed first matte particles are provided on the first matte area, and a plurality of uniformly distributed second matte particles are provided on the second matte area;

[0012] The first matte particles and the second matte particles have the same size, and the distance between the centers of two adjacent first matte particles is greater than the distance between the centers of two adjacent second matte particles.

[0013] Further, a plurality of uniformly distributed first matte particles are provided on the first matte area, and a plurality of uniformly distributed second matte particles are provided on the second matte area;

[0014] The distance between the centers of two adjacent first matte particles is equal to the distance between the centers of two adjacent second matte particles, and the size of the first matte particles is smaller than the size of the second matte particles.

[0015] Further, a plurality of uniformly distributed third matte particles are provided on the second diffusion surface, and the size of the third matte particles is smaller than the size of the first matte particles and the second matte particles.

[0016] Further, the distances between adjacent ones of the light-emitting elements are all the same, and the distance range between adjacent ones of the light-emitting elements is 3 to 6 mm;

[0017] The distance between the light-emitting surface of the light-emitting element and the first diffusion surface is 2 to 15 mm;

[0018] The first frosted area is disposed opposite to the area between adjacent ones of the light-emitting elements, and the second frosted area is disposed opposite to the light-emitting center area of the light-emitting element.

[0019] Further, the distance between the light-emitting element near the edge of the substrate and the edge of the substrate is greater than or equal to the distance between adjacent ones of the light-emitting elements.

[0020] Further, a reflective layer is provided on the substrate, and the reflective layer is coated on the side of the substrate facing the light-emitting element.

[0021] Further, the optical film assembly further includes a prism film and a brightness enhancement film;

[0022] The prism film and the brightness enhancement film are both disposed parallel and opposite to the diffusion film, and the prism film is clamped between the diffusion film and the brightness enhancement film.

[0023] Further, a glue frame is further included;

[0024] The inner wall of the glue frame is provided with a first reflective surface and a second reflective surface; one end of the first reflective surface extends to one end of the glue frame, and the other end is connected to one end of the second reflective surface. The end of the second reflective surface away from the first reflective surface extends to the other end of the glue frame; the second reflective surface is perpendicular to the plane where the substrate is located, and the first reflective surface is inclined, and the end away from the second reflective surface is inclined towards the center direction of the glue frame;

[0025] The edge of the substrate is fixedly connected to the end of the first reflective surface away from the second reflective surface, and the diffusion film is clamped at the connection of the first reflective surface and the second reflective surface, or the diffusion film is connected to the end surface of the glue frame away from the substrate.

[0026] Meanwhile, the present application also provides a liquid crystal display device, including the direct-lit backlight module of the present utility model.

[0027] The beneficial effects of the present utility model are as follows:

[0028] (1) By providing a double diffusion surface, namely a first diffusion surface and a second diffusion surface, on a diffusion film, double diffusion is achieved to obtain a uniform surface light source while reducing the thickness of the backlight module. At the same time, different matte areas are set on the first diffusion surface according to the intensity distribution of the light emitted by the light-emitting component transmitted to the first diffusion surface, so as to further obtain a surface light source with more ideal uniformity; moreover, no additional components are required, and the cost and the thickness of the backlight module can be well controlled;

[0029] (2) By optimizing the size and spacing of the matte particles in the two matte areas, the specular reflection of the light emitted by the light-emitting component transmitted to the area with a larger light intensity on the first diffusion surface is reduced, while the specular reflection of the area with a smaller light intensity is increased, so that the light rays after diffusion by the first diffusion surface are more uniform;

[0030] (3) By designing the arrangement of the light-emitting components and the spacing between the light-emitting components and the first diffusion surface, and combining with the design of the matte particles on the first diffusion surface, a surface light source with high intensity and good uniformity is obtained;

[0031] (4) By providing a reflective layer on the substrate, the light rays transmitted from the light-emitting component to the substrate can be reflected back to the diffusion film, making the utilization of light more sufficient, thereby further increasing the brightness of the emitted surface light source;

[0032] (5) By providing a prism film and a brightness enhancement film, the brightness of the surface light source emitted by the backlight module can be further increased, thereby enhancing the brightness of the entire liquid crystal display screen;

[0033] (6) By providing a first reflective surface and a second reflective surface on the inner wall of the rubber frame, and setting the first reflective surface obliquely, the number of reflections of the light rays transmitted from the light-emitting component to the inner wall of the rubber frame reflected back to the diffusion film can be reduced, further improving the utilization rate of light rays.

[0034] For better understanding and implementation, the present utility model will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0035] Figure 1 It is an external structure diagram of the direct-lit backlight module provided by the embodiment of the present application;

[0036] Figure 2 It is a schematic structural diagram of the light source component and the optical film component provided by the embodiment of the present application;

[0037] Figure 3 It is a front view of the light source component and the optical film component provided by the embodiment of the present application;

[0038] Figure 4 It is a partial schematic diagram of the first diffusion surface provided by the embodiment of the present application;

[0039] Figure 5Schematic diagram of a partial first diffusion surface provided by another embodiment of the present application;

[0040] Figure 6 Schematic diagram of the glue frame structure provided by the embodiment of the present application;

[0041] Figure 7 is Figure 6 A cross-sectional view taken along the A-A direction.

[0042] In the figure: 10 - light source assembly; 11 - substrate; 12 - light-emitting component; 20 - optical film assembly; 21 - diffusion film; 211 - first frosting area; 212 - second frosting area; 2111, 2111' - first frosting particles; 2121, 2121' - second frosting particles; 22 - prism film; 23 - brightness enhancement film; 30 - glue frame; 31 - first reflecting surface; 32 - second reflecting surface. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical direction", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or a connection through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the prior art, a direct-lit backlight module can provide a surface light source with higher brightness compared to a side-lit backlight module for a liquid crystal panel. However, it reduces the uniformity of the surface light source. To solve this problem, usually, a diffusion film disposed on one side of the light-emitting surface of the light source is closer to the light source, such that the light rays of two adjacent main light sources irradiate on the diffusion film and the subsequent film sheets to form a weak light area. Then, the substrate on which multiple main light sources are mounted is set to be transparent or through holes are provided between two adjacent light sources. Then, a set of auxiliary light sources is provided on the side of the substrate facing away from the light source, and each auxiliary light source is disposed at a position between two adjacent main light sources to compensate for the weak light area formed between two adjacent main light sources. This will undoubtedly increase the cost of the backlight module and also increase the overall thickness of the backlight module. Additionally, through holes are provided in the weak light areas on multiple film sheets, enabling the light rays in the weak light areas to directly pass through the through holes and enter the liquid crystal panel. However, the light rays in this part do not undergo the diffusion of the diffusion film and the light enhancement effect of other film sheets such as a brightness enhancement film, and their uniformity and brightness are still not ideal enough.

[0047] Based on this, the present utility model provides a direct-lit backlight module. By providing a double diffusion surface, namely a first diffusion surface and a second diffusion surface, on a single diffusion film, double diffusion is achieved to obtain a uniform surface light source while reducing the thickness of the backlight module. At the same time, different frosted areas are provided on the first diffusion surface according to the intensity distribution of the light transmitted from the light-emitting component to the first diffusion surface, so as to further obtain a surface light source with more ideal uniformity. Moreover, no additional components need to be added, and the cost and the thickness of the backlight module can be well controlled.

[0048] Please also refer to Figures 1 to 2 , the direct-lit backlight module provided by the embodiment of the present application includes a light source component 10 and an optical film sheet component 20. The light source component 10 is used for emitting light rays, and the optical film sheet component 20 is used for converting the light rays emitted by the light source component 10 into a surface light source.

[0049] The light source component 10 includes a substrate 11 and multiple light-emitting components 12. The multiple light-emitting components 12 are arranged in an array on the substrate 11. In this embodiment, the substrate 11 is a PCB board, and the light-emitting component 12 is an LED lamp bead. The LED chip is disposed on the PCB board, and the phosphor is fixed by spraying or film pressing to obtain the LED lamp bead. The PCB board is electrically connected to an external controller. A driving circuit is provided on the PCB board, and the controller controls the driving circuit to drive the LED lamp bead to emit light, and the emitted light is a point light source. In other embodiments, the light-emitting component 12 can also be other light-emitting objects.

[0050] The optical film sheet component 20 includes a diffusion film 21. The diffusion film 21 is disposed on the light-emitting side of the light-emitting component 12 and is disposed parallel and opposite to the substrate 11. The diffusion film 21 is provided with a first diffusion surface and a second diffusion surface. The first diffusion surface faces the light-emitting component 12, and the second diffusion surface faces away from the light-emitting component 12.

[0051] See also Figure 3 The light-emitting element 12 is arranged at a distance from the diffusion film 21. Since there is a certain distance between two adjacent light-emitting elements 12, the area between the two adjacent light-emitting elements 12 does not emit light, and the light emitted by each light-emitting element 12 has a certain divergence angle. Therefore, in the direction perpendicular to the light-emitting surface of the light-emitting element 12, when the distance between the first diffusion surface and the light-emitting surface of the light-emitting element 12 is small, the light intensity of the area corresponding to the two adjacent light-emitting elements 12 on the first diffusion surface is weak, thereby forming a weak light area, and the light intensity of the area corresponding to the light-emitting element 12 is relatively strong, forming a strong light area; when the distance between the first diffusion surface and the light-emitting surface of the light-emitting element 12 is greater than a certain distance, the light on the area corresponding to the two adjacent light-emitting elements 12 on the first diffusion surface will overlap, thereby forming a strong light area, and the light intensity of the area corresponding to the light-emitting element 12 is relatively weak, forming a weak light area.

[0052] According to the intensity distribution of light transmitted to the first diffusion surface, the first diffusion surface is provided with a first frosted area 211 and a second frosted area 212. The first frosted area 211 is used to diffuse light in areas with relatively strong light intensity, and the second frosted area 212 is used to diffuse light in areas with relatively weak light intensity.

[0053] Frosted particles are provided on both the first frosted area 211 and the second frosted area 212 . Light is scattered on the frosted particles so as to propagate in different directions, thereby forming a surface light source.

[0054] See also Figure 4 In this embodiment, a plurality of evenly distributed first frosted particles 2111 are provided on the first frosted area 211, and a plurality of evenly distributed second frosted particles 2121 are provided on the second frosted area 212; the sizes of the first frosted particles 2111 and the second frosted particles 2121 are the same, and the distance between the center points of two adjacent first frosted particles 2111 is greater than the distance between the center points of two adjacent second frosted particles 2121, so that the arrangement of the first frosted particles 2111 is sparser than the arrangement of the second frosted particles 2121. According to the principle of diffuse reflection, this arrangement can make the diffuse reflection of the light emitted by the light-emitting element 12 transmitted to the first frosted area 211 smaller, while the diffuse reflection of the second frosted area 212 is larger, so that the light is more evenly diffused after passing through the first diffusion surface.

[0055] See also Figure 5, in another embodiment, a plurality of uniformly distributed first abrasive particles 2111' are provided on the first frosted area 211, and a plurality of uniformly distributed second abrasive particles 2121' are provided on the second frosted area 212. The distance between the centers of two adjacent first abrasive particles 2111' is equal to the distance between the centers of two adjacent second abrasive particles 2121'. The size of the first abrasive particles 2111' is smaller than the size of the second abrasive particles 2121', which can make the diffuse reflection of the light emitted by the light-emitting element 12 transmitted to the first frosted area 211 smaller, while the diffuse reflection of the second frosted area 212 is larger, so that the light is more uniform after being diffused by the first diffusion surface.

[0056] It can be understood that whether the distance between the first diffusion surface and the light-emitting surface of the light-emitting element 12 is close or far, two or even more frosted areas with different abrasive particle distributions can be provided on the first diffusion surface according to the light intensity distribution as described above to improve the uniformity of the light after diffusion.

[0057] Furthermore, in order to make the surface light source more uniform after being diffused by the first diffusion surface, a plurality of uniformly distributed third abrasive particles are provided on the second diffusion surface. The size of the third abrasive particles is smaller than the size of the first abrasive particles 2111 and the second abrasive particles 2121, and the distance between two adjacent third abrasive particles is smaller to form a more uniform surface light source.

[0058] Furthermore, in the direction perpendicular to the light-emitting surface of the light-emitting element 12, since the light-emitting element 12 itself has a certain height, when the distance between the diffusion film 21 and the light-emitting surface of the light-emitting element 12 is relatively close, even a small external vibration can easily cause a collision between the diffusion film 21 and the light-emitting element 12, and in this case, the intensity difference between the light intensity of the strong light area and the weak light area is relatively large. When the distance between the diffusion film 21 and the light-emitting element 12 is relatively far, it is not easy for the diffusion film 21 and the light-emitting element 12 to collide, and in this case, the intensity difference between the light intensity of the strong light area and the weak light area is relatively small, which is more conducive to generating a more uniform surface light source. However, the distance between the diffusion film 21 and the light-emitting element 12 cannot be too far, otherwise it will greatly reduce the brightness of the diffused surface light source and increase the thickness of the backlight module. Therefore, it is necessary to design the distance between two adjacent light-emitting elements 12 and the distance between the diffusion film 21 and the light-emitting element 12. In this embodiment, the distances between two adjacent light-emitting elements 12 are the same, and the distance range between two adjacent light-emitting elements 12 is preferably 3-6 mm; the distance between the light-emitting surface of the light-emitting element 12 and the first diffusion surface is preferably 2-15 mm. In addition, the distance between the light-emitting element 12 near the edge of the substrate 11 and the edge of the substrate 11 cannot be too close, because when it is too close, it is not conducive to the light emitted by the light-emitting element 12 at the edge to enter the diffusion film 21 for diffusion to form a surface light source. Therefore, preferably, the distance between the light-emitting surface of the light-emitting element 12 and the first diffusion surface is greater than or equal to the distance between two adjacent light-emitting elements 12.

[0059] Further, a reflective layer is provided on the substrate 11, and the reflective layer is coated on one side of the substrate 11 facing the light-emitting element 12. Thus, the light transmitted to the substrate 11 can be reflected back to the diffusion film 21 for diffusion to form a surface light source, so that the light can be more fully utilized, thereby further improving the brightness of the surface light source.

[0060] Further, in order to make the surface light source emitted from the backlight module have a higher brightness to further improve the brightness of the liquid crystal display screen, the optical film assembly 20 further includes a prism film 22 and a brightness enhancement film 23. The prism film 22 and the brightness enhancement film 23 are both disposed parallel and opposite to the diffusion film 21, and the prism film 22 is clamped between the diffusion film 21 and the brightness enhancement film 23.

[0061] Please refer to Figure 6 and Figure 7 The backlight module further includes a rubber frame 30. The inner wall of the rubber frame 30 is provided with a first reflecting surface 31 and a second reflecting surface 32 for reflecting the light emitted by the light-emitting element 12 that partially irradiates the inner wall of the rubber frame 30 back to the diffusion film 21. One end of the first reflecting surface 31 extends to one end of the rubber frame 30, and the other end is connected to one end of the second reflecting surface 32. The end of the second reflecting surface 32 away from the first reflecting surface 31 extends to the other end of the rubber frame 30. The second reflecting surface 32 is perpendicular to the plane where the substrate 11 is located, and the first reflecting surface 31 is inclined and the end away from the second reflecting surface 32 is inclined towards the center direction of the rubber frame 30. Compared with the reflecting surface in the direction perpendicular to the plane where the substrate 11 is located, the inclined reflecting surface can make the number of reflections required to reflect back to the diffusion film 21 less. Therefore, in this embodiment, in the direction perpendicular to the plane where the substrate 11 is located, the height of the first reflecting surface 32 is much greater than the height of the second reflecting surface.

[0062] The edge of the substrate 11 is fixedly connected to the end of the first reflecting surface 31 away from the second reflecting surface 32, and the diffusion film 21 is clamped at the connection between the first reflecting surface 31 and the second reflecting surface 32. At this time, when the light emitted by the light-emitting element 12 partially irradiates the inner wall of the rubber frame 30, it is only reflected back to the diffusion film 21 through the first reflecting surface 31. At the same time, the prism film 22 and the brightness enhancement film 23 are sequentially clamped in the rubber frame 30. Thus, after the light source assembly 10 and the optical film assembly 20 are fixedly connected inside the rubber frame 30, a whole backlight module is formed.

[0063] In another embodiment, the diffusion film 21 is connected to the end face of the rubber frame 30 away from the substrate 11, preferably attached to the end face of the rubber frame 30. At this time, when the light emitted by the light-emitting element 12 partially irradiates the inner wall of the rubber frame 30, it can be reflected back to the diffusion film 21 through the first reflecting surface 31 and the second reflecting surface 32.

[0064] The present application also provides a liquid crystal display device, including the direct-lit backlight module described in the present utility model.

[0065] Compared with the prior art, the beneficial effects of the technical solution of the present application are as follows:

[0066] (1) By providing a double diffusion surface, namely a first diffusion surface and a second diffusion surface, on a diffusion film, double diffusion is achieved to obtain a uniform surface light source while reducing the thickness of the backlight module. At the same time, different frosted areas are set on the first diffusion surface according to the intensity distribution of the light emitted by the light-emitting component transmitted to the first diffusion surface, so as to further obtain a surface light source with more ideal uniformity; moreover, no additional components need to be added, and the cost and the thickness of the backlight module can be well controlled;

[0067] (2) By optimizing the size and spacing of the frosting particles in the two frosted areas, the diffuse reflection of the light emitted by the light-emitting component transmitted to the area with a larger light intensity on the first diffusion surface is smaller, while the diffuse reflection of the area with a smaller light intensity is larger, so that the light after diffusion through the first diffusion surface is more uniform;

[0068] (3) By designing the arrangement of the light-emitting components and the spacing between the light-emitting components and the first diffusion surface, and combining with the design of the frosting particles on the first diffusion surface, a surface light source with high intensity and good uniformity is obtained;

[0069] (4) By providing a reflective layer on the substrate, the light transmitted by the light-emitting component to the substrate can be reflected back to the diffusion film, making the utilization of light more sufficient, thereby further increasing the brightness of the emitted surface light source;

[0070] (5) By providing a prism film and a brightness enhancement film, the brightness of the surface light source emitted by the backlight module can be further increased, thereby enhancing the brightness of the entire liquid crystal display screen;

[0071] (6) By providing a first reflective surface and a second reflective surface on the inner wall of the rubber frame, and setting the first reflective surface obliquely, the number of reflections of the light transmitted by the light-emitting component to the inner wall of the rubber frame back to the diffusion film can be reduced, further improving the utilization rate of light.

[0072] The above embodiments only represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and the present utility model also intends to include these modifications and improvements.

Claims

1. A direct-lit backlight module, characterized in that: Comprising: A light source component and an optical film component; The light source component includes a substrate and a plurality of light-emitting elements, and the plurality of light-emitting elements are arranged in an array on the substrate, and the plurality of light-emitting elements are used for emitting light; The optical film component includes a diffusion film, and the diffusion film is disposed on the light-emitting side of the light-emitting element and is disposed parallel and opposite to the substrate; The diffusion film is provided with a first diffusion surface and a second diffusion surface, the first diffusion surface faces the light-emitting element, and the second diffusion surface faces away from the light-emitting element; the first diffusion surface is provided with a first frosted area and a second frosted area, the first frosted area is used for diffusing the light in the area with stronger light intensity, and the second frosted area is used for diffusing the light in the area with weaker light intensity.

2. The direct-lit backlight module according to claim 1, wherein: A plurality of uniformly distributed first frosted particles are provided on the first frosted area, and a plurality of uniformly distributed second frosted particles are provided on the second frosted area; The first frosted particles and the second frosted particles have the same size, and the distance between the centers of two adjacent first frosted particles is greater than the distance between the centers of two adjacent second frosted particles.

3. The direct-lit backlight module according to claim 1, wherein: A plurality of uniformly distributed first frosted particles are provided on the first frosted area, and a plurality of uniformly distributed second frosted particles are provided on the second frosted area; The distance between the centers of two adjacent first frosted particles is equal to the distance between the centers of two adjacent second frosted particles, and the size of the first frosted particles is smaller than the size of the second frosted particles.

4. The direct-lit backlight module according to claim 2 or 3, wherein: A plurality of uniformly distributed third frosted particles are provided on the second diffusion surface, and the size of the third frosted particles is smaller than the size of the first frosted particles and the second frosted particles.

5. The direct-lit backlight module according to claim 4, wherein: The distance between two adjacent light-emitting elements is the same, and the distance between two adjacent light-emitting elements ranges from 3 to 6 mm; The distance between the light-emitting surface of the light-emitting element and the first diffusion surface is 2 to 15 mm; The first frosted area is disposed opposite to the area between two adjacent light-emitting elements, and the second frosted area is disposed opposite to the light-emitting center area of the light-emitting element.

6. The direct-lit backlight module according to claim 5, wherein: The distance between the light-emitting element near the edge of the substrate and the edge of the substrate is greater than or equal to the distance between two adjacent light-emitting elements.

7. The direct-lit backlight module according to claim 6, wherein: A reflective layer is provided on the substrate, and the reflective layer is coated on the side of the substrate facing the light-emitting element.

8. The direct-lit backlight module according to claim 7, wherein: The optical film component further includes a prism film and a brightness enhancement film; The prism film and the brightness enhancement film are both disposed parallel and opposite to the diffusion film, and the prism film is clamped between the diffusion film and the brightness enhancement film.

9. The direct-lit backlight module according to claim 8, wherein: Further comprising: A rubber frame; The inner wall of the glue frame is provided with a first reflecting surface and a second reflecting surface; one end of the first reflecting surface extends to one end of the glue frame, and the other end is connected to one end of the second reflecting surface. The end of the second reflecting surface far from the first reflecting surface extends to the other end of the glue frame; the second reflecting surface is perpendicular to the plane where the substrate is located, and the first reflecting surface is inclined, and the end far from the second reflecting surface is inclined towards the center direction of the glue frame; The edge of the substrate is fixedly connected to the end of the first reflecting surface far from the second reflecting surface, and the diffusion film is clamped at the connection of the first reflecting surface and the second reflecting surface, or the diffusion film is connected to the end surface of the glue frame far from the substrate.

10. A liquid crystal display device, characterized in that: It includes the direct-lit backlight module according to any one of claims 1-9.

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