Backlight module and display device

Abstract

The invention discloses a backlight module and a display device.The backlight module comprises a transparent substrate, the transparent substrate comprises a first surface and a second surface which are oppositely arranged, and the first surface is provided with a plurality of first grooves; the light-emitting chips are located on one side of the first surface of the transparent substrate, and orthographic projections of light-emitting areas of the light-emitting chips on the first surface fall into the area where the first grooves are located. And the scattering layers are located in the first grooves, the scattering layers are used for scattering light emitted by the light-emitting chips into the first grooves, the light uniformizing process of the backlight module can be completed in the first grooves and the transparent substrate, the backlight module can have the smaller thickness, and meanwhile emergent light of the backlight module is uniform.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] Mini LED (Mini Light Emitting Diode) display device is composed of Mini LED backlight module and display panel, which has the advantages of excellent display effect, long life and high cost performance. At present, Mini LED backlight module often adopts direct-down design, which can achieve better brightness uniformity and higher color contrast within a smaller mixing distance compared with traditional backlight design. With the development of technology, lighter, higher brightness and higher contrast direct-down backlight has become the technical trend of Mini LED backlight development. It is necessary to solve the problem of how to achieve the thinness of backlight module while improving the uniformity of Mini LED backlight. Summary of the invention

[0003] The invention provides a backlight module and a display device. The backlight module can emit uniform backlight and has a relatively low thickness.

[0004] In one aspect, the present invention provides a backlight module, comprising: a transparent substrate, the transparent substrate comprising a first surface and a second surface arranged opposite to each other, the first surface having a plurality of first grooves;

[0005] A plurality of 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 on the first surface falls into the area where the first groove is located;

[0006] A scattering layer is located in each of the first grooves, and the scattering layer is used to scatter the light emitted from the light-emitting chip into the first groove.

[0007] In some embodiments of the present invention, the backlight module further includes a first reflective layer, the first reflective layer is located between the first surface of the transparent substrate and the plurality of light-emitting chips, and the first reflective layer includes a plurality of hollow areas corresponding one-to-one to each of the first grooves.

[0008] In some embodiments of the present invention, 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 includes a plurality of closely arranged micro lenses, and the orthographic projections of the plurality of closely arranged micro lenses on the first surface are covered by the orthographic projections of the first reflective layer on the first surface.

[0010] In some embodiments of the present invention, the backlight module further includes: a light-collecting structure layer, located in each of the first grooves and located on a side of the scattering layer away from the light-emitting chip.

[0011] In some embodiments of the present invention, the light-focusing structure layer includes a plurality of closely arranged micro-prisms;

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

[0013] In some embodiments of the present invention, the second surface includes a plurality of partially reflective and partially transmissive regions, and the partially reflective and partially transmissive regions are covered by the orthographic projection of the first groove on the second surface;

[0014] The partially reflective and partially transmissive region is used to reflect part of the outgoing light from the light-condensing structure layer to the first reflective layer and transmit part of the light out of the transparent substrate.

[0015] In some embodiments of the present invention, the partially reflective and partially transmissive area includes a plurality of second grooves located on the second surface, and the second grooves have partially reflective and partially transmissive films therein;

[0016] There is a set distance between adjacent second grooves in the partially reflective and partially transmissive area, or a plurality of second grooves in the partially reflective and partially transmissive area are closely arranged.

[0017] In some embodiments of the present invention, a cross-sectional shape of the second groove in a direction perpendicular to the second surface is a triangle.

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

[0019] In some embodiments of the present invention, the light emitting chip is used to emit monochromatic light;

[0020] The backlight module further includes a wavelength conversion layer located in the first groove and on a side of the scattering layer close to the light emitting chip. The wavelength conversion layer is used 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 invention, 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.

[0022] In some embodiments of the present invention, the first grooves are arranged in one-to-one correspondence with the plurality of light-emitting chips;

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

[0024] In some embodiments of the present invention, the backlight module further includes:

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

[0026] The second reflective layer is located on a side of the packaging layer away from the transparent substrate, and the second reflective layer covers each of the light-emitting chips and the packaging layer.

[0027] Another aspect of the present invention provides a display device, comprising a display panel and any one of the above-mentioned backlight modules, wherein the display panel is located at the light emitting side of the backlight module.

[0028] The beneficial effects of the present invention are as follows:

[0029] The present invention provides 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 opposite to each other, the first surface having a plurality of first grooves; a plurality of light-emitting chips, which 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 on the first surface falls into the area where the first grooves are located; a scattering layer, which is located in each of the first grooves, and is used for scattering the light emitted from the light-emitting chip into the first grooves, the light homogenization process of the backlight module can be completed in the first grooves and inside the transparent substrate, and the backlight module can have a smaller thickness while emitting more uniform light. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings introduced below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

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

[0032] Figure 2 One of the optical path schematic diagrams of the backlight module provided in an embodiment of the present invention;

[0033] Figure 3 A second structural schematic diagram of a backlight module provided in an embodiment of the present invention;

[0034] Figure 4A second schematic diagram of the light path of the backlight module provided in an embodiment of the present invention;

[0035] Figure 5 A third structural schematic diagram of a backlight module provided in an embodiment of the present invention;

[0036] Figure 6 A fourth structural schematic diagram of a backlight module provided in an embodiment of the present invention;

[0037] Figure 7 A third schematic diagram of the light path of the backlight module provided in an embodiment of the present invention;

[0038] Figure 8 A fourth schematic diagram of the light path of the backlight module provided in an embodiment of the present invention;

[0039] Fig. 9 The fifth structural schematic diagram of the backlight module provided by the embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described below with reference to the accompanying drawings and examples. However, the exemplary embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein; on the contrary, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concepts of the exemplary embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. The words expressing position and direction described in the present invention are all explained using the accompanying drawings as examples, but changes can be made as needed, and the changes made are all included in the scope of protection of the present invention. The drawings of the present invention are only used to illustrate the relative position relationship and do not represent the true proportions.

[0041] At present, Mini LED display devices usually use direct-type backlight modules to provide backlight. Traditional direct-type backlight modules use blue light Mini LED as the light source. By setting some optical film layers on the light-emitting side of the Mini LED light source, the backlight module can emit uniform white light, including reflective film, diffusion film, wavelength selection layer, wavelength conversion layer, prism film, etc. The blue light Mini LED can obtain uniform blue light across the entire surface after passing through the diffusion film. The wavelength selection layer and the wavelength conversion layer can convert the blue light into red light and green light and finally mix the three into white light for emission. The brightness of the white light can be improved after passing through the prism film. The reflective film at the bottom layer can further improve the brightness of the backlight. Finally, the backlight module can emit bright and uniform white light.

[0042] The backlight module needs to have a certain light mixing distance to ensure uniform backlight output. As the backlight module develops towards being lighter, thinner, brighter and with higher contrast, the above-mentioned backlight module structure is difficult to ensure uniform light output while reducing the thickness of the module. In view of this, an embodiment of the present invention provides a backlight module for further reducing its thickness while achieving uniform backlight output.

[0043] Figure 1 This is one of the structural schematic diagrams of the backlight module provided by the embodiment of the present invention.

[0044] like Figure 1 As shown, the backlight module may 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 opposite to each other, and the first surface 11 has a plurality of first grooves 30; the light emitting chip 20 is located on one 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 from the light emitting area 22 of the light emitting chip 20 to the first groove 30, so as to homogenize the light. The scattered light is emitted from the side and bottom of the first groove 30 to the inside of the transparent substrate 10, and then propagates and mixes inside the transparent substrate 10 and then emits from the second surface 12 of the transparent substrate 10. Therefore, the 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 its emitted light is more uniform.

[0045] Specifically, the light emitting chip 20 may be an LED chip, a Mini LED chip, a Micro LED chip, etc., and a driving circuit 21 is provided between the first surface 11 of the transparent substrate 10 and the light emitting chip 20 for driving the light emitting chip 20. Moreover, the light emitting area 22 of the light emitting chip 20 falls into the area where the first groove 30 is located in the orthographic projection of the first surface 11, 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, so as to ensure a high light utilization rate.

[0046] The transparent substrate 10 can be a glass substrate, and each first groove 30 is formed on the first surface 11 by etching glass. The first groove 30 can be arranged in a variety of ways, and its shape can be a prism type, a truncated cone type, etc. One first groove 30 can be arranged corresponding 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 achieve fine control of 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 groove 30 can be set according to needs, and the embodiment of the present invention is not limited here.

[0047] The shape of the scattering layer 31 is adapted to the shape of the first groove 30 . Scattering particle material is arranged in the scattering layer 31 . When light is incident on the scattering particle material, it will be refracted and reflected continuously, so as to achieve the effect of breaking up the light and realizing the effect of uniform light.

[0048] Figure 2 This is one of the light path schematic diagrams of the backlight module provided in the embodiment of the present invention.

[0049] like Figure 1 and Figure 2 As shown, the cross-sectional shape of the first groove 30 can be a trapezoid, 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 be gradually reduced, 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, so that the side surface of the first groove 30 has a certain angle with the second direction Y and the angle is an obtuse angle, and the second direction Y is orthogonal to the first direction X.

[0050] Figure 2 FIG. 3 shows the light emission path after the light is scattered by the scattering layer 31 in the first groove 30. Figure 2 As shown, part of the light scattered by the scattering layer 31 can be emitted from the side of the first groove 30 to the first surface 11 , and part can be emitted from the bottom of the first groove 30 to the second surface 12 .

[0051] Figure 3 The second structural schematic diagram of the backlight module provided by the 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 be gradually increased, so that the angle between the side of the first groove 30 and the second direction Y is an acute angle, and the scattering layer 31 is filled in the first groove 30, thereby, 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, the backlight module in the embodiment of the present invention may further include a first reflective layer 40, which 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. Figure 2 According to the optical path in the transparent substrate 10, the light emitted from the side of the first groove 30 to the first surface 11 can be reflected by the first reflective layer 40 to the second surface 12, thereby increasing the light output from the second surface 12 and improving the light utilization rate, which is beneficial to improving the backlight brightness.

[0054] The first reflective layer 40 includes a plurality of hollow areas corresponding to the first grooves 30 one by one, and the orthographic projection of the scattering layer 31 in the first groove 30 on the second surface 12 of the transparent substrate 10 completely covers the orthographic projection of the hollow area of ​​the first reflective layer 40 on the second surface 12, so that the light emitted from the light-emitting chip 20 to one side of the transparent substrate 10 can all fall into the first groove 30 and be homogenized in the scattering layer 31.

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

[0056] like Figure 4 As shown, in the embodiment of the present 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 may adjust the emission angle of the light reflected by the first reflective layer 40. Figure 2 and Figure 4 The light incident on the first reflective layer 40 at a large angle can be refracted by the refractive structural layer 70 and emitted at a smaller angle. By adjusting the structure of the refractive structural layer 70, the light can be emitted in a set direction, which is beneficial to improving the uniformity of the light emitted from the second surface 12.

[0057] Specifically, the refractive structure layer 70 may include a plurality of closely arranged microlenses, and the orthographic projections of the plurality of closely arranged microlenses on the first surface 11 are covered by the orthographic projections 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 emission angle of the light reflected from the reflective layer to each microlens can be adjusted, that is, the angle of the light when it is emitted 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] It is understandable that for Figure 1 and Figure 3 The backlight modules with different first groove shapes shown in the figure can be provided with other components in the backlight module to achieve a better light uniformity effect. In the following embodiments, the backlight module with the first groove shape shown in the figure is provided with other components in the backlight module to achieve a better light uniformity effect. Figure 3 The backlight module in the shape of the first groove is taken as an example for description.

[0059] Figure 5 A third structural schematic diagram of a backlight module provided in an embodiment of the present invention; Figure 6 The fourth structural schematic diagram of the backlight module provided by the embodiment of the present invention.

[0060] like Figure 5 and Figure 6As shown, in the embodiment of the present invention, the backlight module may further include a light-concentrating structure layer 80, which is located in each first groove 30 and on the side of the scattering layer 31 away from the light-emitting chip 20. The light-concentrating structure layer 80 includes a plurality of microstructures, which can be used to increase the intensity of the emitted light.

[0061] Specifically, Figure 5 As shown, the light-focusing structure layer 80 may include a plurality of closely arranged micro-prisms, or Figure 6 As shown, the focusing structure layer 80 may include a plurality of closely arranged micro lenses. By adaptively designing the arrangement of the micro prisms or micro lenses, the light emitted from the scattering layer 31 may have a higher intensity after passing through the focusing 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 further include a plurality of partially reflective and partially transmissive areas 90, and the partially reflective and partially transmissive areas 90 are covered by the orthographic projection of the first groove 30 on the second surface 12. The partially reflective and partially transmissive areas 90 may be used to partially reflect the light emitted from the light-condensing structure layer 80 to the first reflective layer 40 and partially transmit it out of the transparent substrate 10, so that part of the light emitted from the light-condensing structure layer 80 may be reflected by the first reflective layer 40 and then emitted from the second surface 12 of the transparent substrate 10, which weakens the intensity of the emitted light in the area directly below the light-condensing structure layer 80 to a certain extent, while enhancing the intensity of the emitted light in other areas of the second surface 12, so that the emitted light from the second surface 12 has better uniformity.

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

[0064] like Figure 7 and Figure 8 As shown, in the embodiment of the present invention, the partially reflective and partially transmissive area 90 may include a plurality of second grooves 91 located on the second surface 12, and a partially reflective and partially transmissive film is provided in the second grooves 91. When the light emitted from the light-focusing structure layer 80 is incident on the area with the partially reflective and partially transmissive film in the second grooves 91, part of the light may be transmitted out of the second surface 12, and part of the light may be reflected to the first reflective layer 40, and then reflected by the first reflective layer 40 to other areas of the second surface 12 for emission, so that the light emission brightness in different areas of the second surface 12 can be adjusted to make the backlight more uniform.

[0065] In a specific implementation, the partially reflective and partially transmissive film may be made of a thin layer of metal, and its reflectivity and transmittance may be controlled by controlling the thickness of the thin layer of metal. The reflectivity and transmittance of the partially reflective and partially transmissive film may be set according to actual needs, and the reflectivity and transmittance of the partially reflective and partially transmissive film in each second groove may be the same or different, and the embodiment of the present invention is not limited thereto.

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

[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 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. The embodiment of the present invention does not limit the shape of the second grooves 91, the spacing between the second grooves 91, and their arrangement.

[0068] In some embodiments, the surface 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 the area, the transmittance and reflectivity of the area can be adjusted to achieve the uniform light function.

[0069] Fig. 9 The fifth structural schematic diagram of the backlight module provided by the embodiment of the present invention.

[0070] like Fig. 9 As shown, when the light-emitting chip 20 is used to emit monochromatic light, the backlight module may further include a wavelength conversion layer 32, which 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 of the light emitting chip 20 is incident on the first groove 30, and is excited to emit light of other colors through the wavelength conversion layer 32. The light of various colors is mixed into white light. The white light is homogenized by the scattering layer 31 and then emitted into the transparent substrate 10. After being reflected by the first reflective layer 40, it is emitted from the second surface 12 or directly emitted from the second surface 12.

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

[0073] Among them, the encapsulation layer 50 is located between the first surface 11 of the transparent substrate 10 and the multiple light-emitting chips 20. The encapsulation layer 50 at least covers the multiple first grooves 30 on the first surface 11. The encapsulation layer 50 can be formed by 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 water vapor from entering the first groove 30 to avoid 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 a reflective function, so that 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 to the side away from the transparent substrate 10 and the light emitted from the light-emitting chip 20 to the side away from the transparent substrate 10 toward the transparent substrate 10, which is beneficial to improve the light utilization rate in the backlight module.

[0075] Based on the same inventive concept, an embodiment of the present 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 lightness and thinness.

[0076] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0077] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A backlight module, characterized in that: include: A transparent substrate, the transparent substrate comprising a first surface and a second surface arranged opposite to each other, the first surface having a plurality of first grooves; A plurality of 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 on the first surface falls into the area where the first groove is located; A scattering layer is located in each of the first grooves, and the scattering layer is used to scatter the light emitted from the light-emitting chip into the first groove.

2. The backlight module according to claim 1, characterized in that: It also includes a first reflective layer, which is located between the first surface of the transparent substrate and the plurality of light-emitting chips, and includes a plurality of hollow areas corresponding to the first grooves one by one.

3. The backlight module according to claim 2, characterized in that: Also includes: a refractive structure layer, located between the first reflective layer and the first surface of the transparent substrate; The refractive structure layer includes a plurality of closely arranged micro lenses, and the orthographic projections of the plurality of closely arranged micro lenses on the first surface are covered by the orthographic projections of the first reflective layer on the first surface.

4. The backlight module according to claim 2, wherein: Also includes: The light-collecting structure layer is located in each of the first grooves and on a side of the scattering layer away from the light-emitting chip.

5. The backlight module according to claim 4, characterized in that: The light-focusing structural layer includes a plurality of closely arranged micro-prisms; Alternatively, the light-focusing structure layer includes a plurality of closely arranged micro-lenses.

6. The backlight module according to claim 5, characterized in that: The second surface comprises a plurality of partially reflective and partially transmissive areas, wherein the partially reflective and partially transmissive areas are covered by the orthographic projection of the first groove on the second surface; The partially reflective and partially transmissive region is used to reflect part of the outgoing light from the light-condensing structure layer to the first reflective layer and transmit part of the light out of the transparent substrate.

7. The backlight module according to claim 6, wherein: The partially reflective and partially transmissive area includes a plurality of second grooves located on the second surface, and the second grooves have partially reflective and partially transmissive films therein; There is a set distance between adjacent second grooves in the partially reflective and partially transmissive area, or a plurality of second grooves in the partially reflective and partially transmissive area are closely arranged.

8. The backlight module according to claim 7, characterized in that: The cross-sectional shape of the second groove in a direction perpendicular to the second surface is a triangle.

9. The backlight module according to claim 6, wherein: The surface roughness of the partially reflective and partially transmissive area is greater than the surface roughness of other areas of the second surface.

10. The backlight module according to any one of claims 1 to 9, characterized in that: The light-emitting chip is used to emit monochromatic light; The backlight module further includes a wavelength conversion layer located in the first groove and on a side of the scattering layer close to the light emitting chip. The wavelength conversion layer is used to emit light of other colors under the excitation of the light emitted by the light emitting chip.

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

12. The backlight module according to any one of claims 2 to 9, characterized in that: The first grooves are arranged in one-to-one correspondence with the plurality of light-emitting chips; The orthographic projection of the scattering layer in the first groove on the second surface of the transparent substrate completely covers the orthographic projection of the hollow area of ​​the first reflective layer on the second surface.

13. The backlight module according to any one of claims 1 to 9, characterized in that: Also includes: an encapsulation layer, located between the first surface of the transparent substrate and the plurality of light-emitting chips, the encapsulation layer at least covering the plurality of first grooves on the first surface; The second reflective layer is located on a side of the packaging layer away from the transparent substrate, and the second reflective layer covers each of the light-emitting chips and the packaging layer.

14. A display device, characterized in that: It comprises a display panel and the backlight module according to any one of claims 1 to 13, wherein the display panel is located at the light emitting side of the backlight module.

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