Backlight module and display device

Abstract

The application discloses a backlight module and a display device, wherein the backlight module comprises a transparent substrate, the transparent substrate comprises a first surface and a second surface arranged oppositely, the first surface is provided with a plurality of first grooves; a plurality of light emitting chips are arranged on the first surface side of the transparent substrate, and the light emitting area of the light emitting chip is projected on the first surface and falls into the area of the first groove; and a scattering layer is arranged in each first groove, the scattering layer is used for scattering the light emitted by the light emitting chip into the first groove, the light homogenization process of the backlight module can be completed in the first groove and the inside of the transparent substrate, and the backlight module can have a smaller thickness while the emitted light is more uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a backlight module and a display device. BACKGROUND

[0002] Mini Light Emitting Diode (Mini LED) display device is composed of Mini LED backlight module and display panel, and has excellent display effect, long service life and high cost performance. At present, the Mini LED backlight module usually adopts direct type design, which can realize better brightness uniformity and higher color contrast in smaller light mixing distance compared with traditional backlight design. With the development of technology, thinner, higher brightness and higher contrast direct type backlight has become the technical trend of Mini LED backlight development, and the problem of how to improve the uniformity of Mini LED backlight while realizing the thinning of backlight module needs to be solved. SUMMARY

[0003] The present application provides a backlight module and a display device, which can emit uniform backlight and has low thickness.

[0004] In one aspect, the present application provides a backlight module, comprising: a transparent substrate, the transparent substrate comprising a first surface and a second surface arranged oppositely, the first surface having a plurality of first grooves;

[0005] a plurality of light emitting chips located on the side of the first surface of the transparent substrate, and the light emitting region of the light emitting chip falls into the area where the first groove is located in the orthographic projection of the first surface;

[0006] a scattering layer located in each of the first grooves, the scattering layer being used for scattering the light emitted by the light emitting chip into the first groove.

[0007] In some embodiments of the present application, the backlight module further comprises a first reflective layer located between the first surface of the transparent substrate and the plurality of light emitting chips, and the first reflective layer comprises a plurality of hollow regions corresponding to each of the first grooves.

[0008] In some embodiments of the present application, the backlight module further comprises: a refractive structure layer located between the first reflective layer and the first surface of the transparent substrate.

[0009] The refractive structure layer comprises a plurality of closely arranged microlenses, and the orthographic projection of the plurality of closely arranged microlenses on the first surface is covered by the orthographic projection of the first reflective layer on the first surface.

[0010] In some embodiments of the present application, the backlight module further comprises a light condensing structure layer located in each of the first recesses and on the side of the scattering layer away from the light emitting chip.

[0011] In some embodiments of the present application, the light condensing structure layer comprises a plurality of closely arranged micro-prisms.

[0012] Alternatively, the light condensing structure layer comprises a plurality of closely arranged micro-lenses.

[0013] In some embodiments of the present application, the second surface comprises a plurality of partially reflective and partially transmissive regions, and the first recesses are covered by the projections of the partially reflective and partially transmissive regions on the second surface.

[0014] The partially reflective and partially transmissive regions are configured to partially reflect the light emitted by the light condensing structure layer to the first reflective layer and partially transmit the light out of the transparent substrate.

[0015] In some embodiments of the present application, the partially reflective and partially transmissive regions comprise a plurality of second recesses on the second surface, and the second recesses are provided with partially reflective and partially transmissive films.

[0016] The second recesses in the partially reflective and partially transmissive regions are arranged at a predetermined distance from each other, or the second recesses in the partially reflective and partially transmissive regions are closely arranged.

[0017] In some embodiments of the present application, the second recesses have a triangular cross-sectional shape in the direction perpendicular to the second surface.

[0018] In some embodiments of the present application, the surface roughness of the partially reflective and partially transmissive regions is greater than the surface roughness of other regions of the second surface.

[0019] In some embodiments of the present application, the light emitting chip is configured to emit monochromatic light.

[0020] The backlight module further comprises a wavelength conversion layer located in each of the first recesses and on the side of the scattering layer close to the light emitting chip, and the wavelength conversion layer is configured to emit light of other colors under the excitation of the light emitted by the light emitting chip.

[0021] In some embodiments of the present application, the cross-sectional area of the first recesses gradually increases or gradually decreases in the first direction, and the first direction is perpendicular to the first surface of the transparent substrate and is directed from the first surface to the second surface of the transparent substrate.

[0022] In some embodiments of the present application, the first recesses are arranged one-to-one with the plurality of light emitting chips.

[0023] The scattering layer in the first groove completely covers the projection of the hollow area of the first reflection layer on the second surface of the transparent substrate.

[0024] In some embodiments of the present application, the backlight module further comprises:

[0025] An encapsulation layer is located between the first surface of the transparent substrate and the plurality of light emitting chips, and the encapsulation layer covers at least the plurality of first grooves on the first surface;

[0026] A second reflection layer is located on the side of the encapsulation layer away from the transparent substrate, and the second reflection layer covers each of the light emitting chips and the encapsulation layer.

[0027] In another aspect of the present application, a display device is provided, which comprises a display panel and any of the above backlight modules, and the display panel is located on the light emitting side of the backlight module.

[0028] The present application has the following advantages:

[0029] The present application provides a backlight module and a display device, wherein the backlight module comprises: a transparent substrate comprising a first surface and a second surface arranged oppositely, the first surface having a plurality of first grooves; a plurality of light emitting chips located on the side of the first surface of the transparent substrate, and the projection of the light emitting area of the light emitting chip on the first surface falling into the area where the first grooves are located; and a scattering layer located in each first groove, the scattering layer being used for scattering the light emitted by the light emitting chip into the first groove, and the uniform light process of the backlight module being completed in the interior of the first groove and the transparent substrate, so that the backlight module can have a smaller thickness while the emitted light is more uniform. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings introduced below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor on the basis of these drawings.

[0031] Figure 1 One of the structural schematic diagrams of the backlight module provided by the embodiments of the present application;

[0032] Figure 2 One of the optical path schematic diagrams of the backlight module provided by the embodiments of the present application;

[0033] Figure 3 The second of the structural schematic diagrams of the backlight module provided by the embodiments of the present application;

[0034] Figure 4The second light path schematic diagram of the backlight module provided by the embodiment of the present application;

[0035] Figure 5 The third structure schematic diagram of the backlight module provided by the embodiment of the present application;

[0036] Figure 6 The fourth structure schematic diagram of the backlight module provided by the embodiment of the present application;

[0037] Figure 7 The third light path schematic diagram of the backlight module provided by the embodiment of the present application;

[0038] Figure 8 The fourth light path schematic diagram of the backlight module provided by the embodiment of the present application;

[0039] Figure 9 The fifth structure schematic diagram of the backlight module provided by the embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to make the above objectives, features and advantages of the present application more apparent, comprehensible and easier to understand, the present application will be further described below with reference to the accompanying drawings and embodiments. However, the example embodiments can be implemented in various forms, and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present application more comprehensive and complete, and to fully convey the ideas of the example embodiments to those skilled in the art. The same reference numerals in the drawings represent the same or similar structures, and thus repeated descriptions thereof will be omitted. The expressions of position and direction described in the present application are described with reference to the drawings, but can be changed as needed, and the changes made are included in the scope of protection of the present application. The drawings of the present application are only used to illustrate the relative positional relationship and do not represent the true proportions.

[0041] At present, the direct type backlight module is usually used in the Mini LED display device to provide backlight. In the traditional direct type backlight module, a blue light Mini LED is used as a light source, and some optical film layers are arranged on the light emitting side of the Mini LED light source to make the backlight module emit uniform white light, including a reflective film, a diffusion film, a wavelength selection layer, a wavelength conversion layer, a prism film, etc. After passing through the diffusion film, the blue light Mini LED can obtain uniform whole-surface blue light. The wavelength selection layer and the wavelength conversion layer can realize the conversion of blue light into red light and green light, and finally mix the three into white light. After the white light passes through the prism film, its brightness can be improved. The reflective film located in the lowermost layer can further improve the brightness of the backlight. Finally, the backlight module can emit high-brightness uniform white light.

[0042] In order to ensure a certain light mixing distance in the backlight module, the emitted backlight is uniform. With the development of the backlight module towards lighter, higher brightness and higher contrast, the above backlight module structure is difficult to ensure the uniformity of the emitted light while reducing the thickness of the module. Therefore, the embodiment of the present application provides a backlight module to further reduce the thickness while realizing uniform emission of the backlight.

[0043] Figure 1 The structure of the backlight module provided by the embodiment of the present application is shown in one of the schematic diagrams.

[0044] As shown in Figure 1 The backlight module can include a transparent substrate 10, a light emitting chip 20 and a scattering layer 31. The transparent substrate 10 includes a first surface 11 and a second surface 12 arranged oppositely, and the first surface 11 has a plurality of first grooves 30. The light emitting chip 20 is located on the side of the first surface 11 of the transparent substrate 10. The scattering layer 31 is located in each first groove 30, and the scattering layer 31 is used to scatter the light emitted by the light emitting area 22 of the light emitting chip 20 into the first groove 30, thereby homogenizing the light. The scattered light is emitted from the side surface and the bottom surface of the first groove 30 to the inside of the transparent substrate 10, propagates and mixes in the inside of the transparent substrate 10, and then is emitted from the second surface 12 of the transparent substrate 10. Thus, the light homogenization process of the backlight module can be completed in the first groove 30 and the inside of the transparent substrate 10, and the backlight module can have a smaller thickness while the emitted light is more uniform.

[0045] Specifically, the light emitting chip 20 can be an LED chip, a Mini LED chip, a Micro LED chip, etc. A driving circuit 21 is arranged between the first surface 11 of the transparent substrate 10 and the light emitting chip 20 to drive the light emitting chip 20. Moreover, the orthographic projection of the light emitting area 22 of the light emitting chip 20 falls into the area where the first groove 30 is located, so that the emitted light of the light emitting chip 20 can fall into the area of the first groove 30 as much as possible, thereby ensuring a high light utilization rate.

[0046] The transparent substrate 10 can be a glass substrate, and each first groove 30 can be formed on the first surface 11 by etching the glass. The first groove 30 can have various arrangement modes, and its shape can be a prism type or a circular truncated cone type. One first groove 30 can correspond to at least one light emitting chip 20. When each first groove 30 and each light emitting chip 20 are arranged one by one, it is beneficial to finely control the emitted light of the light emitting chip 20 and improve the uniformity of the backlight. In specific implementation, the shape and number of the first grooves 30 can be set according to requirements, which are not limited in the embodiment of the present application.

[0047] The shape of the scattering layer 31 is adapted to the shape of the first groove 30. The scattering layer 31 is provided with scattering particle material. When light is incident on the scattering particle material, it will be continuously refracted and reflected, thereby achieving the effect of scattering the light and realizing the function of uniform light.

[0048] Figure 2 This is one of the optical path diagrams of the backlight module provided in the embodiments of the present invention.

[0049] like Figure 1 and Figure 2 As shown, the cross-sectional shape of the first groove 30 can be trapezoidal, the scattering layer 31 is filled in the first groove 30, and the cross-sectional area of ​​the first groove 30 along the first direction X can gradually decrease. The first direction X is perpendicular to the first surface 11 of the transparent substrate 10 and points from the first surface 11 to the second surface 12 of the transparent substrate 10. Thus, the side of the first groove 30 has a certain angle with the second direction Y and the angle is obtuse. The second direction Y is orthogonal to the first direction X.

[0050] Figure 2 The diagram illustrates the light path after being scattered by the scattering layer 31 in the first groove 30, as shown below. Figure 2 As shown, some of the light scattered by the scattering layer 31 can exit from the side of the first groove 30 to one side of the first surface 11, and some can exit from the bottom of the first groove 30 to one side of the second surface 12.

[0051] Figure 3 This is the second schematic diagram of the backlight module provided in an embodiment of the present invention.

[0052] like Figure 3 As shown, in some embodiments, the cross-sectional area of ​​the first groove 30 along the first direction X can gradually increase, so that the angle between the side of the first groove 30 and the second direction Y is an acute angle. The scattering layer 31 is filled in the first groove 30, so that more light can be emitted from the side of the first groove 30 to one side of the first surface 11.

[0053] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment of the invention, the backlight module may further include a first reflective layer 40. The first reflective layer 40 is located between the first surface 11 of the transparent substrate 10 and the plurality of light-emitting chips 20, and can be used to reflect incident light toward the second surface 12 of the transparent substrate 10. (Refer to...) Figure 2 In the light path, the light emitted from the side of the first groove 30 toward the first surface 11 of the transparent substrate 10 can be reflected by the first reflective layer 40 toward the second surface 12, thereby increasing the amount of light emitted from the second surface 12, improving the light utilization rate, and thus helping to improve the backlight brightness.

[0054] The first reflective layer 40 includes a plurality of hollow areas corresponding one-to-one with each of the first grooves 30. Furthermore, the orthographic projection of the scattering layer 31 in the first groove 30 onto the second surface 12 of the transparent substrate 10 completely covers the orthographic projection of the hollow area of ​​the first reflective layer 40 onto the second surface 12. This allows the light emitted by the light-emitting chip 20 toward the transparent substrate 10 to fall into the first groove 30 and be homogenized in the scattering layer 31.

[0055] Figure 4 This is the second schematic diagram of the optical path of the backlight module provided in the embodiment of the present invention.

[0056] like Figure 4 As shown, in this embodiment of the invention, the backlight module may further include a refractive structure layer 70, which is located between the first reflective layer 40 and the first surface 11 of the transparent substrate 10. The refractive structure layer 70 can adjust the emission angle of the light reflected by the first reflective layer 40. (Refer to...) Figure 2 and Figure 4 Light rays incident at a large angle to the first reflective layer 40 can be refracted by the refractive structure layer 70 and emitted at a smaller angle. By adjusting the structure of the refractive structure layer 70, the light rays can be emitted in a set direction, which helps to improve the uniformity of the light rays emitted from the second surface 12.

[0057] Specifically, the refractive structure layer 70 may include a plurality of closely arranged microlenses, and the orthographic projection of the plurality of closely arranged microlenses on the first surface 11 is covered by the orthographic projection of the first reflective layer 40 on the first surface 11. By adjusting the radius of curvature, size, and arrangement of each microlens in the refractive structure layer 70, the exit angle of the light reflected from the reflective layer to each microlens can be adjusted, that is, the angle at which the light exits from the second surface 12 of the transparent substrate 10 can be adjusted. In some embodiments, the angle of the light emitted from the refractive structure layer 70 can be adjusted to be perpendicular to the second surface 12, so that the second surface 12 can emit uniform parallel light.

[0058] Understandably, for example Figure 1 and Figure 3 Backlight modules with different first groove shapes, as shown, can all have other components set in them to achieve better light uniformity. The following embodiments all use backlight modules with the following shapes... Figure 3 The following explanation uses the first groove-shaped backlight module as an example.

[0059] Figure 5 This is the third schematic diagram of the backlight module provided in the embodiment of the present invention; Figure 6 The fourth schematic diagram of the backlight module provided in the embodiment of the present invention.

[0060] like Figure 5 and Figure 6As shown in this embodiment of the invention, the backlight module may further include a light-concentrating structure layer 80, which is located within each of the first grooves 30 and on the side of the scattering layer 31 opposite to the light-emitting chip 20. The light-concentrating structure layer 80 includes multiple microstructures that can be used to improve the intensity of the emitted light.

[0061] Specifically, such as Figure 5 As shown, the light-concentrating structure layer 80 may include a plurality of closely packed microprisms, or, as... Figure 6 As shown, the light-concentrating structure layer 80 may include multiple closely arranged microlenses. By adaptively designing the arrangement of microprisms or microlenses, the light emitted from the scattering layer 31 can have higher intensity after passing through the light-concentrating structure layer 80, which is beneficial to improving the light output brightness of the backlight module.

[0062] like Figure 5 and Figure 6 As shown, the second surface 12 may also include multiple partially reflective and partially transmissive regions 90, and the partially reflective and partially transmissive regions 90 are covered by the orthographic projection of the first groove 30 on the second surface 12. The partially reflective and partially transmissive regions 90 can be used to partially reflect the emitted light from the light-concentrating structure layer 80 to the first reflective layer 40 and partially transmit it out of the transparent substrate 10. Thus, some of the light emitted from the light-concentrating structure layer 80 can be reflected by the first reflective layer 40 and then emitted from the second surface 12 of the transparent substrate 10, which weakens the emitted light intensity in the area directly below the light-concentrating structure layer 80 to a certain extent, while enhancing the emitted light intensity in other areas of the second surface 12, so that the emitted light from the second surface 12 has better uniformity.

[0063] Figure 7 This is the third schematic diagram of the optical path of the backlight module provided in the embodiment of the present invention; Figure 8 The fourth schematic diagram of the optical path of the backlight module provided in the embodiment of the present invention.

[0064] like Figure 7 and Figure 8 As shown in this embodiment of the invention, the partially reflective and partially transmissive region 90 may include a plurality of second grooves 91 located on the second surface 12, and each second groove 91 contains a partially reflective and partially transmissive film. When light emitted from the light-concentrating structure layer 80 is incident on the region containing the partially reflective and partially transmissive film in the second groove 91, some light can be transmitted out of the second surface 12, and some light can be reflected to the first reflective layer 40, and then reflected by the first reflective layer 40 to other regions of the second surface 12 for emission. This allows for the control of the emitted light brightness in different regions of the second surface 12, resulting in more uniform backlighting.

[0065] In specific implementation, the partially reflective and partially transmissive film can be made of a thin layer of metal. By controlling the thickness of the thin layer of metal, its reflectivity and transmittance can be controlled. The reflectivity and transmittance of the partially reflective and partially transmissive film can be set according to actual needs. The reflectivity and transmittance of the partially reflective and partially transmissive film in each second groove can be the same or different. This embodiment of the invention does not limit this.

[0066] like Figure 7 As shown, in some embodiments, adjacent second grooves 91 in the partially reflective and partially transmissive regions 90 may have a set distance between them, or, as... Figure 8 As shown, in some embodiments, the plurality of second grooves 91 in the partially reflective and partially transmissive region 90 can be closely arranged, such as... Figure 7 and Figure 8 As shown, the cross-sectional shape of the second groove 91 in the direction perpendicular to the second surface 12 can be triangular.

[0067] In specific implementation, the specific structure of each second groove 91 can be designed according to actual needs to control the amount of light reflected from the partially reflective and partially transmissive area 90 to the first reflective layer 40, and to balance the brightness of the light emitted from the partially reflective and partially transmissive area 90 with the light emitted from other areas on the second surface 12. In this embodiment of the invention, the shape of the second groove 91, the spacing between each second groove 91 and its arrangement are not limited.

[0068] In some embodiments, the area of ​​the second surface 12 corresponding to the first groove 30 can be roughened to form a partially reflective and partially transmissive area 90. The surface roughness of the partially reflective and partially transmissive area 90 is greater than the surface roughness of other areas of the second surface 12. By adjusting the roughness in this area, the transmittance and reflectance of this area can be adjusted to achieve the function of uniform light.

[0069] Figure 9 The fifth schematic diagram of the backlight module provided in the embodiment of the present invention.

[0070] like Figure 9 As shown, when the light-emitting chip 20 is used to emit monochromatic light, the backlight module may also include a wavelength conversion layer 32. The wavelength conversion layer 32 is located in the first groove 30 and on the side of the scattering layer 31 close to the light-emitting chip 20. The wavelength conversion layer 32 may be made of a mixture of multiple fluorescent materials or a mixture of multiple quantum dot materials, so that it can be used to emit light of other colors under the excitation of the light emitted by the light-emitting chip 20.

[0071] The emitted light from the light-emitting chip 20 is incident into the first groove 30, and other colors of light are excited by the wavelength conversion layer 32. The various colors of light are mixed to form white light. After being homogenized by the scattering layer 31, the white light is emitted into the interior of the transparent substrate 10. After being reflected by the first reflective layer 40, it is emitted from the second surface 12 or directly from the second surface 12.

[0072] Reference Figures 1-9 In this embodiment of the invention, the backlight module may further include an encapsulation layer 50 and a second reflective layer 60.

[0073] The encapsulation layer 50 is located between the first surface 11 of the transparent substrate 10 and the plurality of light-emitting chips 20. The encapsulation layer 50 covers at least the plurality of first grooves 30 on the first surface 11. The encapsulation layer 50 can be formed of a transparent insulating material, which can isolate the driving circuit 21 from the structure on the first surface 11 of the transparent substrate 10, such as the first reflective layer 40, and can also prevent moisture from entering the first grooves 30, thus avoiding adverse effects on the performance of the backlight module.

[0074] The second reflective layer 60 is located on the side of the encapsulation layer 50 away from the transparent substrate 10 and covers each light-emitting chip 20 and the encapsulation layer 50. The second reflective layer 60 can be made of white oil or other insulating materials with reflective function. Thus, the second reflective layer 60 can reflect the light emitted from the scattering layer 31 and the wavelength conversion layer 32 in the first groove 30 toward the side away from the transparent substrate 10, as well as the light emitted from the light-emitting chip 20 toward the side away from the transparent substrate 10, toward the transparent substrate 10, which is beneficial to improving the light utilization rate in the backlight module.

[0075] Based on the same inventive concept, this embodiment of the invention also provides a display device, which includes a backlight module and a display panel located on the light-emitting side of the backlight module. The display panel can be a liquid crystal display panel. The backlight module has the advantages of uniform light emission, high brightness and low thickness. By using the above-mentioned backlight module to provide backlight for the display panel, the display device can have a better display effect and a higher degree of thinness.

[0076] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0077] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A backlight module, characterized in that, include: A transparent substrate, the transparent substrate including a first surface and a second surface disposed opposite to each other, the first surface having a plurality of first grooves; Multiple light-emitting chips are located on one side of the first surface of the transparent substrate, and the orthographic projection of the light-emitting area of ​​the light-emitting chip onto the first surface falls into the area where the first groove is located. A scattering layer is located within each of the first grooves, and the scattering layer is used to scatter the light emitted by the light-emitting chip into the first grooves; A first reflective layer is located between the first surface of the transparent substrate and the plurality of light-emitting chips. The first reflective layer includes a plurality of hollow areas that correspond one-to-one with each of the first grooves. A light-concentrating structure layer is located within each of the first grooves and on the side of the scattering layer opposite to the light-emitting chip.

2. The backlight module as described in claim 1, characterized in that, Also includes: A refractive structure layer is located between the first reflective layer and the first surface of the transparent substrate; The refractive structure layer includes a plurality of closely arranged microlenses, the orthographic projection of the plurality of closely arranged microlenses on the first surface being covered by the orthographic projection of the first reflective layer on the first surface.

3. The backlight module as described in claim 1, characterized in that, The light-concentrating structure layer includes multiple closely arranged microprisms; Alternatively, the light-concentrating structure layer may comprise a plurality of closely spaced microlenses.

4. The backlight module as described in claim 3, characterized in that, The second surface includes a plurality of partially reflective and partially transmissive areas, which are covered by the orthographic projection of the first groove onto the second surface; The partially reflective and partially transmissive region is used to partially reflect the emitted light from the light-concentrating structure layer to the first reflective layer and partially transmit it out of the transparent substrate.

5. The backlight module as described in claim 4, characterized in that, The partially reflective and partially transmissive region includes a plurality of second grooves located on the second surface, and the second grooves have a partially reflective and partially transmissive film. The second grooves in the partially reflective transmissive region are spaced apart by a set distance, or the second grooves in the partially reflective transmissive region are arranged closely together.

6. The backlight module as described in claim 5, characterized in that, The cross-sectional shape of the second groove in the direction perpendicular to the second surface is triangular.

7. The backlight module as described in claim 4, characterized in that, The surface roughness of the partially reflective transmissive region is greater than the surface roughness of other regions of the second surface.

8. The backlight module as described in any one of claims 1 to 7, characterized in that, The light-emitting chip is used to emit monochromatic light; The backlight module also includes a wavelength conversion layer located within the first groove and on the side of the scattering layer close to the light-emitting chip. The wavelength conversion layer is used to emit light of other colors when excited by the light emitted from the light-emitting chip.

9. The backlight module as described in any one of claims 1 to 7, characterized in that, The cross-sectional area of ​​the first groove gradually increases or decreases along a first direction, where the first direction is perpendicular to the first surface of the transparent substrate and points from the first surface to the second surface of the transparent substrate.

10. The backlight module according to any one of claims 1 to 7, characterized in that, The first groove is configured to correspond one-to-one with each of the plurality of light-emitting chips; The orthographic projection of the scattering layer in the first groove onto the second surface of the transparent substrate completely covers the orthographic projection of the cutout area of ​​the first reflective layer onto the second surface.

11. The backlight module as described in any one of claims 1 to 7, characterized in that, Also includes: An encapsulation layer is located between the first surface of the transparent substrate and the plurality of light-emitting chips, and the encapsulation layer at least covers the plurality of first grooves on the first surface; The second reflective layer is located on the side of the encapsulation layer opposite to the transparent substrate, and the second reflective layer covers each of the light-emitting chips and the encapsulation layer.

12. A display device, characterized in that, It includes a display panel and a backlight module as described in any one of claims 1 to 11, wherein the display panel is located on the light-emitting side of the backlight module.

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