Backlight module and display screen

Abstract

The present application provides a backlight module and a display screen, wherein the backlight module is applied to a display device and is used to provide light to the display device. The backlight module includes a substrate and a light source assembly. The substrate has a plurality of light-emitting areas, and the plurality of light-emitting areas are arranged in an array. There are a plurality of light source assemblies, and the plurality of light source assemblies are arranged in a one-to-one correspondence in the plurality of light-emitting areas. Each light source assembly includes a plurality of light source components arranged in an array, and each light source component includes a light-emitting unit and a reflective film for splitting the light emitted by the light-emitting unit. When the reflective film is set, the following conditions are met: along the direction from the center to the edge of the light-emitting area where the light source component is located, the proportion of the light splitting of the reflective film toward the center direction of the light-emitting area gradually increases. This allows the light emitted by the light source assembly to have a good light mixing effect in the light-emitting area, thereby improving the light-emitting effect of the backlight module. In addition, splitting light through the reflective film facilitates the miniaturization of the backlight module.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a backlight module and a display screen. Background Art

[0002] When the LCD is working, the liquid crystal material itself does not emit light, and must rely on passive light sources. The light source needs to illuminate the LCD panel from the back to control the output of light to form an image. The mainstream LCD backlight technology on the market currently uses light-emitting diodes as light sources, and the mainstream methods are edge-entry backlight modules and direct-type backlight modules.

[0003] The edge-entry backlight module places the light source on the side of the module. After the light enters from the side, it passes through the light guide plate, which scatters the light and gradually couples the light evenly to form a surface light source. The edge-entry backlight module has the advantage of being thin and light, but all light sources need to be turned on all the time to ensure uniform light output, and the light source cannot be adjusted according to the brightness of the image area.

[0004] The direct-type backlight module places the light source directly under the panel, and the light source array is evenly arranged, so that light directly enters the display panel from the bottom of the display panel, forming uniform illumination of the display panel. In addition, since the light source of the backlight module is directly under the display panel, the brightness of different light sources can be controlled according to the brightness of the displayed image. However, due to the wide diffusion range of the light source, a large-scale halo will be formed when a single area on the display panel is lit. This halo will cause obvious halo when displaying a bright object with a black background, reducing the local display contrast effect.

[0005] As people's quality of life improves, the display requirements for liquid crystal displays are becoming higher and higher, but the two existing backlight modules cannot achieve a good image area display contrast effect. Summary of the invention

[0006] The present application provides a backlight module and a display screen, which improve the light emitting effect of the backlight module to provide a display effect of the display screen.

[0007] In the first aspect, a backlight module is provided, which is applied to a display device and used to provide light to the display device. The backlight module includes a substrate and a light source assembly. The substrate has a plurality of light-emitting areas, and the plurality of light-emitting areas are arranged in an array. There are a plurality of light source assemblies, and the plurality of light source assemblies are arranged in a one-to-one correspondence in the plurality of light-emitting areas. Each light source assembly includes a plurality of light source components arranged in an array, and each light source component includes a light-emitting unit and a reflective film for splitting the light emitted by the light-emitting unit. When the reflective film is set, the following conditions are met: along the direction from the center to the edge of the light-emitting area where the light source component is located, the proportion of the light splitting of the reflective film toward the center direction of the light-emitting area gradually increases. This allows the light emitted by the light source assembly to have a good light mixing effect in the light-emitting area, thereby improving the light-emitting effect of the backlight module. In addition, splitting by the reflective film facilitates the miniaturization of the backlight module.

[0008] In a specific possible implementation, the reflective film is located on the light emitting side of the corresponding light emitting unit, the reflective film faces the top light emitting surface of the light emitting unit, and is used to split the top light of the light emitting unit. The light emitted from the top of the light emitting unit is mixed by the reflective film.

[0009] In a specific possible implementation, the reflective film is a conical surface; the tip of the reflective film faces the top light-emitting surface of the corresponding light-emitting unit; and along the direction away from the center of the light-emitting area, the distance between the straight line perpendicular to the light-emitting unit where the tip of the reflective film is located and the center line of the corresponding light-emitting unit gradually increases, and the center line of the light-emitting unit refers to a straight line passing through the center of the light-emitting unit along the thickness direction of the substrate. The conical surface is used to split the light.

[0010] In a specific possible implementation manner, the conical surface is a conical surface, a triangular pyramid surface, a quadrangular pyramid surface, etc. Different conical surfaces can be selected for light splitting.

[0011] In a specific possible implementation, the distance between the straight line passing through the substrate along the thickness direction of the substrate where the cone tip of the reflective film is located and the center line of the light-emitting area is a first distance, and the distance between the center line of the light-emitting unit corresponding to the reflective film and the center line of the light-emitting area is a second distance, and the first distance is greater than the second distance; wherein the center line of the light-emitting area refers to a straight line passing through the center of the light-emitting area along the thickness direction of the substrate. The shape of the conical surface is set to improve the light splitting ratio of the light-emitting unit.

[0012] In a specific implementation scheme, the connection line between the projection of the cone tip of the reflective film in the first plane and the projection of the center of the light-emitting area in the first plane is the first connection line; the center line of the light-emitting unit corresponding to the reflective film intersects with the first connection line, and the first plane is parallel to the surface of the substrate. The light splitting effect is improved.

[0013] In a specific possible implementation manner, a plurality of light-through holes are arranged on the reflective film, and the light-through holes are arranged to improve the light splitting effect.

[0014] In a specific implementation manner, the plurality of light-through holes are evenly arranged on the reflective film to improve the light splitting effect.

[0015] In a specific possible implementation, the reflective film is bonded to the top light emitting surface of the light emitting unit by transparent adhesive to achieve relative fixation of the reflective film and the light emitting unit.

[0016] In a specific possible implementation manner, each light source component further includes a flat layer covering the reflective film, so as to facilitate the processing of the light source components.

[0017] In a specific possible implementation manner, the flat layer is a transparent structure, and the reflective film is a coating layer disposed on the flat layer.

[0018] In a specific possible implementation manner, the flat layer is reflective white glue, and the reflective film is the surface of the reflective white glue facing the corresponding light-emitting unit.

[0019] In a specific implementation, the backlight module further includes a diffusion film and a prism brightness enhancement film; the diffusion film and the prism brightness enhancement film are stacked; the diffusion film is closer to the multiple light source components than the prism brightness enhancement film, thereby further improving the light mixing effect of the backlight module.

[0020] In a specific possible implementation, each light emitting area corresponds to a display area of ​​the display screen one by one, thereby improving the display effect of the display device.

[0021] In a second aspect, a display screen is provided, which includes a backlight module as described in any one of the above items and a liquid crystal layer stacked with the backlight module. By using a reflective film for light splitting, and along the direction from the center to the edge of the light-emitting area where the light source is located, the proportion of the light splitting by the reflective film toward the center of the light-emitting area gradually increases. This allows the light emitted by the light source assembly to have a good light mixing effect in the light-emitting area, thereby improving the light-emitting effect of the backlight module. In addition, light splitting by the reflective film facilitates the miniaturization of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1is a schematic diagram of the structure of a display device;

[0023] Figure 2 is a schematic structural diagram of a display surface of a display device;

[0024] Figure 3 A schematic diagram of the structure of a backlight module provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the structure of an LED light source array provided in an embodiment of the present application;

[0026] Figure 5 A schematic diagram of the structure of a light source component provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram showing the coordination between the cone tip of the reflective film of the light source component provided in an embodiment of the present application and the center line of the light source component;

[0028] Figure 7 A schematic diagram of the coordination of the center point of the light source, the cone tip of the reflective film and the center point of the light-emitting area provided in an embodiment of the present application;

[0029] Figure 8 A schematic diagram of the structure of a light source component provided in an embodiment of the present application;

[0030] Fig. 9 A schematic diagram of the structure of another light source provided in an embodiment of the present application;

[0031] Fig.10 A schematic diagram of the structure of another light source provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be further described below in conjunction with the accompanying drawings.

[0033] To facilitate understanding of the backlight module provided in the embodiment of the present application, the application scenario of the backlight module of the present application is first described. The backlight module is applied to a display device to provide light for displaying the display device. Figure 1 As shown in , the display device includes a backlight module 1, a polarizing plate 2, a driving control circuit 3, a display layer 4, a color filter 5, etc. Among them, the backlight module 1 provides a uniform white light source for the display device, the polarizing plate 2 adjusts the polarization state of the light emitted by the backlight module to a specific linear polarization state, the driving control circuit 3 controls the voltage signal to control the deflection of the liquid crystal material molecules in the display layer 4 to change the polarization direction of the incident light, and the color filter 5 changes the color of the light at the pixel point.

[0034] refer to Figure 2 , Figure 2The structure diagram of the display surface of the display device is shown. When the display layer 10 is displaying, the display layer 10 can be divided into different display areas according to the displayed image. For example, each pixel is a display area 11, or a plurality of pixels constitute a display area 11. Figure 2 The example shows the arrangement of multiple display areas 11 in an array, but it should be understood that Figure 2 The example is only an example of a specific division of the display area 11, and the display area can be divided into different areas according to the displayed image. When displaying an image, the light in different display areas 11 needs to be different. In order to improve the display contrast of the image area when the display device displays the picture and improve the display effect of the display device, it is necessary to minimize the interference of the light passing through different display areas. However, the direct-type backlight module and the side-entry backlight module provided in the prior art cannot provide good light. For this reason, the embodiment of the present application provides a backlight module to provide a contrast effect for the image area of ​​the display device. It is described in detail below in conjunction with specific drawings and embodiments.

[0035] refer to Figure 3 , Figure 3 The schematic diagram of the structure of the backlight module provided in the embodiment of the present application is shown. The backlight module provided in the embodiment of the present application is a direct-type backlight module, which includes components such as a substrate 20, an LED (Light Emitting Diode) light source array 30, a diffusion film 40, and a prism brightness enhancement film 50. Among them, the diffusion film 40 is closer to the light source array 30 than the prism brightness enhancement film 50.

[0036] The substrate 20 is used to carry the LED light source array 30 and to supply power to the LED light source array 30. The LED light source array 30 is used to provide light to the display layer 10 so that it can emit light for display. The diffusion film 40 further achieves uniform light and improves the light mixing effect. The prism brightness enhancement film 50 increases the forward brightness of the light (forward refers to the direction in which the backlight module points to the display layer 10) to provide the display layer 10 with a uniform white light surface light source.

[0037] It should be understood that in the embodiment of the present application, the diffusion film 40 and the prism brightness enhancement film 50 are optional film layers, and the backlight module provided in the embodiment of the present application can selectively set the diffusion film 40 or the prism brightness enhancement film 50 according to the need of light mixing. Of course, in addition to the above-mentioned diffusion film 40 or prism brightness enhancement film 50, the backlight module can also select other conventional layer structures as needed, which will not be listed one by one in the embodiment of the present application.

[0038] refer to Figure 4 , Figure 4 FIG. 1 shows a schematic diagram of the structure of an LED light source array. Figure 2The backlight module is also divided into different regions of the display layer as shown in the figure. The substrate 20 can be divided into a plurality of light-emitting regions 21, which are arranged in an array and correspond to the display regions of the display screen one by one, so as to provide the required light to each display region.

[0039] When the substrate 20 is divided into a plurality of light-emitting regions 21, the corresponding LED light source array is also divided, and the LED light source array is divided into a plurality of light source assemblies, and the plurality of light source assemblies are arranged one by one in the plurality of light-emitting regions 21. Each light source assembly includes a plurality of light source components 31, and in the embodiment of the present application, the plurality of light source components 31 are arranged in an array. The following description will be made by taking one of the light source components as an example.

[0040] The light source assembly includes a plurality of light source elements 31 arranged in an array. To improve the light mixing effect, in the embodiment of the present application, the light emission direction of the light source element 31 is adjusted according to the position of the light source element 31. The specific adjustment scheme is as follows: the light source element 31 located at the center of the light emitting area 21 emits light in all directions, and the light source element 31 located at the edge of the light emitting area 21 emits light inwardly of the light emitting area 21.

[0041] refer to Figure 4 The straight lines around the light source 31 shown in the figure are the directions of the light emission corresponding to the light source 31. The number of straight lines represents the amount of light emission. Figure 4 It can be seen that the light source 31 located in the middle position emits light in all directions, and the light source 31 located at the edge of the light emitting area 21 emits light along the edge of the light emitting area 21 and toward the inside of the light emitting area 21. In addition, the light source 31 located at the edge of the light emitting area 21 reduces or does not emit light toward the adjacent light emitting area 21, so as to reduce the light crosstalk between the two light emitting areas 21.

[0042] refer to Figure 5 , Figure 5 A schematic diagram of the structure of a light source component is shown. Each light source component includes a light-emitting unit 311 and a corresponding reflective film 313. Among them, the light-emitting unit 311 is an inverted LED lamp bead, and the two solder pads 312 of the inverted LED lamp bead are respectively located at the bottom of the LED lamp bead and connected to the circuit layer of the substrate. When an inverted LED lamp bead is used, the solder pad 312 will not occupy the top light-emitting surface of the light-emitting unit 311, thereby increasing the light-emitting area of ​​the light-emitting unit 311. Of course, the light-emitting unit 311 provided in the embodiment of the present application can also adopt other types of light-emitting structures, which are not specifically limited in the present application.

[0043] The reflective film 313 is used to split the light emitted by the light emitting unit 311. In combination with the structure of the light emitting unit 311, when the reflective film 313 is set, the reflective film 313 faces the top light emitting surface of the light emitting unit 311 and is used to split the top light emitted by the light emitting unit 311. When splitting the light emitting unit 311, the reflective film 313 has a surface that is relatively inclined to the top light emitting surface of the light emitting unit 311, so that the light emitted from the top can be reflected by the reflective film 313 and then reflected in the desired direction. Figure 5 As shown by the straight arrow in the figure, the light emitted from the top light emitting surface is reflected by the reflective film 313 and then reflected to the surroundings. Compared with the prior art in which the light source of the direct-lit backlight module diverges the light emitted by the point light source through a lens, it can be seen that the lens in the prior art needs a larger thickness to ensure the divergence effect, while in the present application, the light emitted by the light source is reflected by the reflective film to achieve the light divergence effect, which can greatly reduce the thickness of the light source.

[0044] Exemplarily, the reflective film 313 is a conical surface, and the tip of the reflective film 313 faces the top light-emitting surface of the corresponding light-emitting unit 311 . The light emitted from the top light-emitting surface can be reflected by the conical surface and then emitted.

[0045] In an optional solution, the conical surface is a conical surface, a triangular pyramid surface, a quadrangular pyramid surface, etc. In specific settings, different shapes of the reflective film 313 can be selected as needed, and no specific limitation is made in the embodiment of the present application.

[0046] In order to make the light source located at the center of the light-emitting area emit light uniformly in all directions, and the light source located at the edge emits light into the light-emitting area. When setting the reflective film 313 of each light source, the direction of reflected light emission is controlled by adjusting the shape of the reflective film 313. Exemplarily, along the direction from the center to the edge of the light-emitting area where the light source is located, the proportion of light splitting by the reflective film 313 toward the center of the light-emitting area gradually increases. So that the light source farther away from the center of the light-emitting area has a greater amount of light split toward the center of the light-emitting area, and the light splitting toward other areas is smaller.

[0047] In order to conveniently describe the reflection effect of the reflection film 313, the center line of the light-emitting unit 311 and the center line of the light-emitting area are defined. The center line of the light-emitting unit 311 refers to a straight line passing through the center of the light-emitting unit along the thickness direction of the substrate. The center line of the light-emitting unit 311 is also the center line of the light source. The center line of the light-emitting area refers to a straight line passing through the center of the light-emitting area along the thickness direction of the substrate.

[0048] For the convenience of describing the reflective film, d and D are defined, where d is the first distance between the straight line passing through the substrate along the thickness direction of the substrate where the cone tip of the reflective film is located and the center line of the light-emitting area. D is the second distance between the center line of the light-emitting unit corresponding to the reflective film and the center line of the light-emitting area. When the reflective film is set, the distance between the cone tip of the reflective film and the center line of the corresponding light-emitting unit gradually increases in the direction away from the center of the light-emitting area, that is, the distance d changes with the distance D. Figure 6 The five light source components shown are used as examples to illustrate the corresponding relationship between the positions of the reflective films and the light source components.

[0049] Figure 6 The five light sources shown are Figure 4 A row of light source components in the middle of a light emitting area 21 is shown in the figure. For the convenience of description, the five light source components are named as the first light source component 32, the second light source component 33, the third light source component 34, the fourth light source component 35 and the fifth light source component 36. The first light source component 32 is located at the center point of the light emitting area. Along the direction away from the center point of the light emitting area, the second light source component 33 and the third light source component 34 are arranged on one side of the first light source component 32, and the fourth light source component 35 and the fifth light source component 36 are arranged on the other side of the first light source component 32. Among them, the distance between the second light source component 33 and the fourth light source component 35 and the center point of the light emitting area is D1, and the distance between the third light source component 34 and the fifth light source component 36 and the center point of the light emitting area is D2; wherein, D2>D1. The distance from the above light source component to the center point of the light emitting area refers to the minimum distance from the center line of the light source component to the center point of the light emitting area.

[0050] Take the second light source 33 and the third light source 34 as examples. The cone tip of the first light source 32 is located at the center line L1 of the first light source 32, and the center line L1 passes through the center point of the light-emitting area. The distance between the straight line passing through the substrate along the thickness direction of the substrate where the cone tip O1 of the second light source 33 is located and the center line L2 of the second light source 33 (the center line L2 also passes through the substrate along the thickness direction of the substrate) is d1, and the distance between the straight line passing through the substrate along the thickness direction of the substrate where the cone tip O2 of the third light source 34 is located and the center line L3 of the third light source 34 (the center line L3 also passes through the substrate along the thickness direction of the substrate) is d2. And d1<d2. It can be seen from this that the distance between the straight line passing through the substrate along the thickness direction of the substrate where the cone tip of the reflective film is located and the center line of the corresponding light source element gradually increases as the distance between the light source element and the center point of the light-emitting area increases.

[0051] Continue to refer Figure 6When setting the light-emitting unit and the reflective film of each light source, the first distance D3 must be greater than the second distance D1 (taking the second light source 33 as an example, the first distance is D3 and the second distance is D1). The first distance D3 is the distance between the straight line passing through the substrate along the thickness direction of the substrate where the cone tip of the reflective film is located and the center line of the light-emitting area; the second distance D1 is the distance between the center line of the light-emitting unit corresponding to the reflective film and the center line of the light-emitting area. Figure 6 It can be seen that D3=D1+d2.

[0052] Combination Figure 5 In the structure shown, the straight line where the cone tip is located and passes through the corresponding light-emitting unit along the thickness direction of the substrate divides the reflected light into different directions, and a part of the cone surface located at the cone tip close to the center point of the light-emitting area can reflect the light emitted by the light-emitting unit to the center position of the light-emitting area. And a part of the cone surface located at the cone tip far from the center point of the light-emitting area can reflect the light emitted by the light-emitting unit to the center position away from the light-emitting area. Therefore, in the embodiment of the application, when the above-mentioned setting scheme that the corresponding first distance gradually increases as the distance between the light source part and the center point of the light-emitting area gradually increases is adopted, the light source part far from the center point of the light-emitting area can reflect more light to the center of the light-emitting area. In addition, the reflective film of the light source part (the third light source part 34 and the fifth light source part 36) located at the edge of the light-emitting area, the straight line where the cone tip passes through the corresponding light-emitting unit along the thickness direction of the substrate is located at the edge of the light source part, so that the emitted light is emitted toward the center area of ​​the light-emitting area, and the light emitted to the adjacent light-emitting area is minimized.

[0053] For reference Figure 7 The relationship between the light splitting amount of the light source 31 in the light emitting area and the position of the light source 31 is that when the light source 31 splits the light, the light splitting effect is arranged in a divergent shape with the center point of the light emitting area as the center. Figure 7 In the figure, point O3 is the center point of the light emitting area, point O4 represents the center line of each light source element 31, and point O5 is the cone tip of the reflective film of each light source element 31. Figure 7 It can be seen from the top view that points O3, O4 and O5 are located on the same straight line. In the three-dimensional structure, the connection line between the projection of the cone tip of the reflective film in the first plane and the projection of the center of the light-emitting area in the first plane is the first connection line, and the center line of the light-emitting unit corresponding to the reflective film intersects with the first connection line; it is worth noting that the first plane refers to a plane parallel to the upper surface or lower surface of the substrate, the upper surface of the substrate refers to the surface with the light source assembly, and the lower surface of the substrate is opposite to the upper surface of the substrate. Figure 7It can be seen that in the light source elements 31 in the same row or column or arranged in a diagonal line, along the direction away from the center point O3 of the light emitting area, the projection of the reflective film cone tip O5 on the first plane is farther from the projection of the center point O3 of the light emitting area on the first plane than the center line (point O4) of the corresponding light source element 31, so that the light emitting area of ​​the light source element 31 is toward the edge of the light emitting area or toward the inside of the light emitting area, thereby avoiding the divergence of light into adjacent light emitting areas.

[0054] It can be seen from the above description that the backlight module provided in the embodiment of the present application adopts light source components with different light-emitting directions and are arranged in the light-emitting area according to design requirements: the light source components in the center of the light-emitting area emit light to the surrounding areas, and the light source components at the edge of the light-emitting area emit light into the light-emitting area, thereby achieving uniform light mixing and suppressing crosstalk between light between the light-emitting areas.

[0055] refer to Figure 8 , Figure 8 FIG. 3 is a schematic diagram showing the structure of a light source 31 provided in an embodiment of the present application. The light source 31 includes a light emitting unit 311 and a reflective film 313. The structure of the light emitting unit 311 can be referred to in Figure 5 When the reflective film 313 is connected to the light emitting unit 311, the reflective film 313 is bonded to the top light emitting surface of the light emitting unit 311 through the first optical adhesive layer 314. Exemplarily, the first optical adhesive layer 314 is a transparent adhesive layer to ensure that the light from the top light emitting surface of the light emitting unit 311 can pass through the first optical adhesive layer.

[0056] As an optional solution, to facilitate the production of the light source component 31, the light source component 31 also includes a flat layer 315 covering the reflective film 313, so that the top of the light source component 31 forms a flat plane, which is convenient for grasping by a grasping device after the production is completed.

[0057] When the above structure is adopted, the flat layer 315 can be the second optical adhesive layer, and the reflective film 313 can be a coating coated between the first optical adhesive layer and the second optical adhesive layer. For example, the coating can be a coating with high reflective effect such as an aluminum coating or a silver coating.

[0058] In the specific preparation, firstly, the LED process is completed on the sapphire substrate to form a light-emitting unit, and then a transparent glue 314 is formed on the light-emitting unit 311. A microstructure is made on the transparent glue 314, and the shape of the microstructure corresponds to the shape of the reflective film 315, such as a cone. After the microstructure is prepared, a reflective metal (Al or Ag) is evaporated on the surface of the microstructure to form a reflective film 315. Then a flat layer is made, and the outermost surface of the flat layer is smoothed to facilitate the grasping device to grasp the light source component.

[0059] refer to Fig. 9 , Fig. 9 The structural schematic diagram of another light source component 31 is illustrated. The light source component 31 includes a light-emitting unit 311, a first optical adhesive layer 314 and a flat layer 315. The first optical adhesive layer 314 is connected to the top light-emitting surface of the light-emitting unit 311. A conical hole corresponding to the reflective film is formed on the first optical adhesive layer 314. The flat layer 315 is filled in the conical hole. The flat layer 315 adopts reflective white glue, which can reflect light. Therefore, the surface where the flat layer 315 contacts the first optical adhesive layer 314 can be used as a reflective film, thereby simplifying the structure of the light source component 31, and the above-mentioned reflective film can be formed when the flat layer 315 is prepared.

[0060] Fig.10 Based on Figure 8 or Fig. 9 A variation of the light source shown. Figure 8 or Fig. 9 A light-through hole 3131 is added to the reflective film 313 shown. When the reflective film 313 is a coating coated on the first optical adhesive layer 314 and the flat layer 315 adopts the second optical adhesive layer, the light-through hole 3131 can be a hole opened on the coating. When the reflective film 313 is one surface of the reflective white adhesive, the light-through hole 3131 is a through hole penetrated in the flat layer 315. When the light emitted by the light-emitting unit 311 is irradiated to the reflective film 313, part of the light can pass through the light-through hole 3131 and then be set, and part of the light can be reflected by the reflective film 313. It can be seen from the above description that the light-through hole 3131 is also a light splitting method of the reflective film 313. The light can be split in different directions by the reflective film 313.

[0061] As an optional solution, the plurality of light-through holes 3131 may be evenly arranged on the reflective film 313 , or may be arranged on the reflective film 313 in other arrangements according to the need for light mixing.

[0062] The embodiment of the present application also provides a display screen, which includes any of the above-mentioned backlight modules and a liquid crystal layer stacked with the backlight module. By using a reflective film for light splitting, and along the direction from the center to the edge of the light-emitting area where the light source is located, the proportion of light splitting by the reflective film toward the center of the light-emitting area gradually increases. This allows the light emitted by the light source assembly to have a good light mixing effect in the light-emitting area, thereby improving the light-emitting effect of the backlight module. In addition, light splitting by the reflective film facilitates the miniaturization of the backlight module.

[0063] The embodiment of the present application also provides a display device, which includes any of the above-mentioned backlight modules and a liquid crystal layer stacked with the backlight module. By using a reflective film for light splitting, and along the direction from the center to the edge of the light-emitting area where the light source is located, the proportion of light splitting by the reflective film toward the center of the light-emitting area gradually increases. This allows the light emitted by the light source assembly to have a good light mixing effect in the light-emitting area, thereby improving the light-emitting effect of the backlight module. In addition, light splitting by the reflective film facilitates the miniaturization of the backlight module.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A backlight module, characterized in that: It includes a substrate and a plurality of light source components; wherein, The substrate has a plurality of light-emitting areas arranged in an array; the plurality of light source components are arranged in a one-to-one correspondence in the plurality of light-emitting areas; Each light source assembly includes a plurality of light source elements arranged in an array, each light source element includes a light emitting unit and a reflective film for splitting light emitted by the light emitting unit; along the direction from the center to the edge of the light emitting area where the light source element is located, the proportion of light splitting by the reflective film toward the center of the light emitting area gradually increases; Among them, the reflective film is located on the light-emitting side of the corresponding light-emitting unit, the reflective film faces the top light-emitting surface of the light-emitting unit, and is used to split the top light emitted by the light-emitting unit; the reflective film is a conical surface; the cone tip of the reflective film faces the top light-emitting surface of the corresponding light-emitting unit.

2. The backlight module according to claim 1, characterized in that: Along the direction away from the center of the light-emitting area, the distance between the straight line passing through the substrate along the thickness direction of the substrate where the cone tip of the reflective film is located and the center line of the corresponding light-emitting unit gradually increases, and the center line of the light-emitting unit refers to the straight line passing through the center of the light-emitting unit along the thickness direction of the substrate.

3. The backlight module according to claim 2, characterized in that: The distance between the straight line passing through the substrate along the thickness direction of the substrate where the cone tip of the reflective film is located and the center line of the light-emitting area is a first distance, and the distance between the center line of the light-emitting unit corresponding to the reflective film and the center line of the light-emitting area is a second distance, and the first distance is greater than the second distance; wherein the center line of the light-emitting area refers to a straight line passing through the center of the light-emitting area along the thickness direction of the substrate.

4. The backlight module according to claim 2 or 3, characterized in that: The connecting line between the projection of the cone tip of the reflective film in the first plane and the projection of the center of the light-emitting area in the first plane is the first connecting line; the center line of the light-emitting unit corresponding to the reflective film intersects with the first connecting line, and the first plane is parallel to the surface of the substrate.

5. The backlight module according to claim 1, wherein: The reflective film is provided with a plurality of light-through holes.

6. The backlight module according to claim 5, characterized in that: The plurality of light-through holes are evenly arranged on the reflective film.

7. The backlight module according to claim 1, wherein: The reflective film is bonded and connected to the top light emitting surface of the light emitting unit by transparent adhesive.

8. The backlight module according to claim 1, wherein: Each light source element further includes a planar layer covering the reflective film.

9. The backlight module according to claim 1, wherein: The backlight module further comprises a diffusion film and a prism brightness enhancement film; the diffusion film and the prism brightness enhancement film are stacked; the diffusion film is closer to the multiple light source assemblies than the prism brightness enhancement film.

10. The backlight module according to claim 1, wherein: Each light emitting area corresponds one-to-one to a display area of ​​the display layer of the display screen.

11. A display screen, characterized in that: The invention comprises the backlight module according to any one of claims 1 to 10 and a liquid crystal layer stacked with the backlight module.

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