Backlight module and display device

Abstract

An embodiment of the present invention provides a backlight module and a display device, comprising: a transparent substrate, a light conversion layer, a plurality of light sources, and a second reflective layer. A plurality of grooves are provided on one side of the transparent substrate, and the sidewalls thereof are arranged in a stepped manner. At least one first reflective layer is provided on each step, and the orthographic projection area of ​​the first reflective layer on the same step on the transparent substrate is smaller than the orthographic projection area of ​​the bottom of the step on the transparent substrate. The light conversion layer fills the grooves. The light source is located on the side of the light conversion layer away from the transparent substrate, and the orthographic projection of the light source on the transparent substrate at least partially overlaps with the orthographic projection of the light conversion layer on the transparent substrate. The second reflective layer is provided on one side of the transparent substrate and on the same side as the light conversion layer. The orthographic projection of the second reflective layer on the base substrate does not overlap with the orthographic projection of the light conversion layer on the transparent substrate.

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] With the development of society, various display devices such as mobile phones, computers, and televisions are becoming increasingly inseparable from people's lives and work. Display devices generally include a display panel and a backlight module. The backlight module provides light for the display panel, allowing the display device to display images normally.

[0003] While pursuing the display quality of display devices, higher requirements are also placed on the thinness and lightness of display devices. As a part of the display device, the thickness of the backlight module seriously restricts the overall thickness of the display device. Therefore, on the basis of meeting the brightness uniformity, a backlight module with a simple structure and thin thickness is urgently needed. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a backlight module and a display device to solve the problem that the existing backlight module has a complex structure and is relatively thick. The specific technical solution is as follows:

[0005] The first aspect of the present application provides a backlight module, comprising: a transparent substrate, a plurality of grooves being provided on one side of the transparent substrate, the sidewalls of the grooves being arranged in a stepped manner, at least one first reflective layer being provided on each step, the orthographic projection area of ​​the first reflective layer on the same step being smaller than the orthographic projection area of ​​the groove on the transparent substrate where the step is located; a light conversion layer filling the grooves; a plurality of light sources, the light sources being located on a side of the light conversion layer away from the transparent substrate, the orthographic projections of the light sources on the transparent substrate at least partially overlapping with the orthographic projections of the light conversion layer on the transparent substrate; and a second reflective layer being provided on a side of the transparent substrate between adjacent grooves and on the same side as the grooves.

[0006] In addition, the backlight module provided in the first aspect of the present application may also have the following technical features:

[0007] In some embodiments, the cross-sectional area of ​​the groove increases successively along a direction approaching the groove opening; and the orthographic projections of the first reflective layer of each level of steps on the transparent substrate do not overlap.

[0008] In some embodiments, the inner edge of the first reflective layer at the bottom of a step away from the bottom of the groove has an orthographic projection on the transparent substrate flush with the outer edge of the first reflective layer at the next step.

[0009] In some embodiments, the first reflective layer at the bottom of the groove is provided at a center position of the bottom of the groove.

[0010] In some embodiments, the sidewall of the groove includes at least two steps.

[0011] In some embodiments, a continuous protrusion structure or a discontinuous protrusion structure is provided on one side of the transparent substrate, and the second reflective layer is provided on the side of the continuous protrusion structure or the discontinuous protrusion structure away from the transparent substrate, and the orthographic projection of the continuous protrusion structure or the discontinuous protrusion structure on the transparent substrate overlaps with the orthographic projection of the second reflective layer on the transparent substrate.

[0012] In some embodiments, the first reflective layer extends beyond the step by a distance of 0 μm-100 μm, and the second reflective layer covers the openings of the grooves on two adjacent sides by a length of 0 μm-100 μm.

[0013] In some embodiments, the light conversion layer is a quantum dot conversion layer or a fluorescent color conversion layer, and the first reflective layer and the second reflective layer are single reflective layers or composite reflective layers.

[0014] In some embodiments, the portion where the orthographic projection of the light source on the transparent substrate overlaps with the orthographic projection of the light conversion layer on the transparent substrate is a light-emitting area, and the portion where the orthographic projection of the light source on the transparent substrate does not overlap with the orthographic projection of the light conversion layer on the transparent substrate is a pad area, and the pad area is electrically connected to an external circuit.

[0015] In some embodiments, the backlight module also includes a first packaging layer arranged on the side of the second reflective layer and the light conversion layer away from the transparent substrate; a second packaging layer is provided on the side of the light source away from the transparent substrate, and the second packaging layer is used to independently encapsulate each of the light sources.

[0016] In some embodiments, the second encapsulation layer is a white oil layer.

[0017] In some embodiments, the backlight module further includes a grating polarizer, and the grating polarizer is disposed on a side of the transparent substrate facing away from the second reflective layer and the light conversion layer.

[0018] A second aspect of the present application provides a display device, which includes the backlight module described above.

[0019] Beneficial effects of the embodiments of the present invention:

[0020] In the backlight module provided by the embodiments of the present invention, since the light conversion layer is disposed within the stepped groove, the light conversion layer does not occupy additional space, which helps reduce the thickness of the backlight module. The first reflective layer provided on each step can transmit light from the light source to the first reflective layer through multiple reflections and out through the other side of the transparent substrate. This multiple transmission allows the transmitted light to be transmitted in various directions, covering a wider area, thereby achieving a uniform light output effect and improving the light output uniformity of the backlight module. The second reflective layer is used to reflect the light reflected by the light conversion layer, so that the light is transmitted through the side of the transparent substrate facing away from the second reflective layer, thereby improving light output efficiency.

[0021] Of course, it is not necessary to achieve all of the advantages described above simultaneously in order to implement any product or method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0023] Figure 1 A schematic structural diagram of a backlight module provided in an embodiment of the present application;

[0024] Figure 2 for Figure 1 Schematic diagram of the light propagation path of the light source in the backlight module without the grating polarizer;

[0025] Figure 3 A schematic structural diagram of another embodiment of the backlight module provided in the embodiment of the present application;

[0026] Figure 4-13 This is a schematic diagram of the manufacturing steps of the backlight module provided in an embodiment of the present application, wherein the backlight module does not include a grating polarizer.

[0027] The figure numbers are as follows: transparent substrate 10; groove 11; first reflective layer 12; second reflective layer 13; protruding structure 14; photoresist 15; etched hole 16; light conversion layer 20; light emitting light source 30; light emitting area 31; pad area 32; first lead 321; second lead 322; first metal trace 323; second metal trace 324; first packaging layer 40; second packaging layer 50; grating polarizer 60; distance L1; length L2. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of the present invention.

[0029] In a first aspect, an embodiment of the present application provides a backlight module, such as Figure 1 、 Figure 2 As shown, Figure 1 It is a structural diagram of the backlight module. Figure 2 for Figure 1 Schematic diagram of the light propagation path of the light source 30 after removing the grating polarizer 60 from the backlight module. The backlight module includes: a transparent substrate 10, a light conversion layer 20, multiple light sources 30 and a second reflective layer 13. A plurality of grooves 11 are provided on one side of the transparent substrate 10 (wherein, Figure 1 、 Figure 2 The portion filled with the light conversion layer 20 corresponds to the location of the groove 11. The sidewalls of the groove 11 are arranged in a stepped manner, with at least one first reflective layer 12 disposed on each step. The orthographic projection area of ​​the first reflective layer 12 on the transparent substrate 10 is smaller than the orthographic projection area of ​​the groove 11 located at the step. The light conversion layer 20 fills the groove 11. Multiple light sources 30 are located on the side of the light conversion layer 20 away from the transparent substrate 10. The orthographic projections of the light sources 30 on the transparent substrate 10 at least partially overlap with the orthographic projection of the light conversion layer 20 on the transparent substrate 10. A second reflective layer 13 is disposed on the side of the transparent substrate 10 between adjacent grooves 11 and is located on the same side as the grooves 11.

[0030] In the embodiment of the present application, the light conversion layer 20 is arranged in the groove 11 of the transparent substrate 10, so the light conversion layer 20 does not need to occupy additional space, which can reduce the thickness of the backlight module. The first reflective layer 12 set at each step can transmit the light irradiated by the light source 30 to the first reflective layer 12 through multiple reflections from the other side of the transparent substrate 10. After multiple transmissions, the transmitted light can be transmitted in all directions, covering a wider area, thereby achieving a uniform light output effect and improving the light output uniformity of the backlight module. The second reflective layer 13 is used to reflect the light reflected by the light conversion layer 20, so that the light is transmitted from the side of the transparent substrate 10 facing away from the second reflective layer 13, thereby improving the light output efficiency. The principle can be seen. Figure 2 Schematic diagram of the light propagation path shown.

[0031] The orthographic projection area of ​​the first reflective layer 12 on the same step on the transparent substrate 10 is smaller than the orthographic projection area of ​​the groove 11 where the step is located on the transparent substrate 10. This means that the first reflective layer 12 on the same step does not completely cover the step and the opening between them, thereby preventing the first reflective layer 12 from reflecting all light. As a result, no light is emitted from the corresponding position on the side of the transparent substrate 10 facing away from the first reflective layer 12, forming a black spot.

[0032] By providing the stepped grooves 11 and arranging the first reflective layer 12 on each step, uniform light emission of the backlight module is achieved, and the thickness of the backlight module is reduced, which has the advantage of a simple structure.

[0033] When the light source 30 is a direct-lit light source, the first reflective layer 12 can cause the emitted light to be emitted in all directions, thereby improving the light uniformity of the backlight module and avoiding visual mura (defectiveness).

[0034] In some embodiments, as Figure 1 、 Figure 2 As shown, the cross-sectional area of ​​the groove 11 gradually increases in a direction close to the opening of the groove 11 ; the orthographic projections of the first reflective layer 12 of each level of step on the transparent substrate 10 do not overlap.

[0035] In this embodiment, the side close to the opening of the groove 11 is closer to the light source 30. The cross-sectional area of ​​the groove 11 here is larger, and the area of ​​the light conversion layer 20 is also larger. In the direction away from the light source 30, the area of ​​the light conversion layer 20 gradually decreases, so that more light from the light source 30 can be transmitted downward through the light conversion layer 20, which is beneficial to increase the light output rate of the backlight module.

[0036] like Figure 1 、 Figure 2 As shown, the orthographic projections of the stepped first reflective layer 12 on the transparent substrate 10 do not overlap. This arrangement reduces the area of ​​light blocked by the first reflective layer 12 from the light source 30, thereby maximizing the light output rate while diverging the light and increasing light extraction efficiency. This arrangement also avoids the problem of black spots on the side facing away from the second reflective layer 13 due to obstruction by the first reflective layer 12.

[0037] Furthermore, if Figure 1 、 Figure 2 As shown, the inner edge of the first reflective layer 12 at the bottom of the step away from the bottom of the groove 11 is flush with the outer edge of the first reflective layer 12 at the next step in its orthographic projection on the transparent substrate 10 .

[0038] In this embodiment, the first reflective layer 12 of each step seamlessly connects between the orthographic projections of the transparent substrate 10, reflecting light emitted by the light source 30 so that it is emitted in all directions after multiple reflections from the first reflective layer 12 or the first reflective layer 12 and the second reflective layer 13, thereby improving the uniformity of light output from the backlight module. Specifically for direct-lit light sources, this arrangement can reflect all light emitted by the direct-lit light source that faces the first reflective layer 12, redistributing the emitted light and further improving light uniformity. Furthermore, this arrangement minimizes the area of ​​the first reflective layer 12 while fully reflecting the light that faces the first reflective layer 12, thus contributing to cost savings.

[0039] In some embodiments, as Figure 1 、 Figure 2 As shown, the first reflective layer 12 at the bottom of the groove 11 is provided at the center of the bottom of the groove 11 .

[0040] In this embodiment, only one first reflective layer 12 is provided at the bottom of the groove 11 and is located at the center, so as to facilitate symmetrical and uniform distribution of the first reflective layer 12 on each upper step, thereby reducing manufacturing difficulty.

[0041] In some embodiments, as Figure 3 As shown, the side wall of the groove 11 includes at least two steps. Figure 3 and Figure 1 The difference is that Figure 3 The side wall of the middle groove 11 is a two-step step. Figure 1 The sidewalls of the middle groove 11 are three-stepped. The greater the number of steps, the more reflections the light from the light source 30 undergoes before exiting, which is more conducive to redistributing the exiting light evenly. However, the greater the number of steps, the more complex the manufacturing process. Therefore, setting the number of steps to two ensures even distribution of the exiting light while simplifying the manufacturing process.

[0042] In some embodiments, as Figure 1 、 Figure 2 As shown, a continuous convex structure 14 or a discontinuous convex structure 14 is provided on one side of the transparent substrate 10, and the second reflective layer 13 is provided on the side of the continuous convex structure 14 or the discontinuous convex structure 14 away from the transparent substrate 10, and the orthographic projection of the continuous convex structure 14 or the discontinuous convex structure 14 on the transparent substrate 10 overlaps with the orthographic projection of the second reflective layer 13 on the transparent substrate 10.

[0043] In this embodiment, the second reflective layer 13 is arranged on the side of the protruding structure 14 away from the transparent substrate 10, so that the side of the second reflective layer 13 facing the protruding structure 14 naturally forms an uneven surface, which can increase the divergence effect of the second reflective layer 13 on the incident light reflected by the first reflective layer 12 to its surface, further improving the light output uniformity of the backlight module.

[0044] Specifically, the protrusion structure 14 may be made of a transparent organic resin material.

[0045] In some embodiments, as Figure 1 As shown, the distance L1 that the first reflective layer 12 extends beyond the step is 0μm-100μm, for example, it can be 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, etc., and the length L2 that the second reflective layer 13 covers above the openings of the grooves 11 on both adjacent sides is 0μm-100μm, for example, it can be 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, etc.

[0046] In this embodiment, the protruding first reflective layer 12 can reflect light emitted by the light source 30. The longer the protruding distance L1, the larger the reflective surface area. However, a larger protruding distance L1 also increases the area blocked from the light source 30, which can easily result in a black spot where no light is emitted from the corresponding position on the side facing away from the first reflective layer 12. The portion of the second reflective layer 13 covering the openings of the adjacent grooves 11 can secondary reflect the light emitted by the first reflective layer 12, facilitating light redistribution. The larger the area of ​​this portion, the more light can be secondary reflected. However, the larger the area blocked from the light source 30, the less favorable the downward transmission of light from the light source 30. Therefore, a suitable protruding distance of the first reflective layer 12 is between 0 μm and 100 μm, and a suitable length L2 covered by the second reflective layer 13 is between 0 μm and 100 μm.

[0047] Furthermore, the distance L1 of the first reflective layer 12 extending beyond the step is 50 μm-100 μm, and the length L2 of the second reflective layer 13 covering the openings of the adjacent grooves 11 is 50 μm-100 μm.

[0048] In some embodiments, the light conversion layer 20 is a quantum dot color conversion layer or a fluorescent color conversion layer, and the first reflective layer 12 and the second reflective layer 13 are single reflective layers or composite reflective layers.

[0049] In this embodiment, the fluorescence emission of the quantum dot color conversion layer originates from electron transitions, and its color is determined by the nanocrystal size of the quantum dots, reflecting the quantum confinement effect at the nanoscale. The fluorescence emission of the fluorescent color conversion layer originates from lattice defects, and its color is produced by doping with different ions. Quantum dots offer advantages such as high luminous efficiency, a narrow spectrum, high color purity, and a wide color gamut. Therefore, the use of a quantum dot color conversion layer can provide a more realistic color display for the backlight module. Phosphor luminescence has the advantage of high color tunability, so the use of a fluorescent color conversion layer can produce softer or more vivid colors to suit different application needs.

[0050] When the first reflective layer 12 is a single-layer reflective layer, it can be a metal reflective layer with high reflectivity, such as metal silver or metal aluminum. When the first reflective layer 12 is a composite reflective layer, it can be a composite reflective layer formed by alternating stacks of two oxides with different refractive indices, such as SiO2 / SiN X / SiO2 / SiN X or SiO X / TiO2 / SiO X / TiO2 alternately stacked composite reflective layer.

[0051] In some embodiments, as Figure 1 、 Figure 2 As shown, the portion where the orthographic projection of the luminous light source 30 on the transparent substrate 10 overlaps with the orthographic projection of the light conversion layer 20 on the transparent substrate 10 is the luminous area 31, and the portion where the orthographic projection of the luminous light source 30 on the transparent substrate 10 does not overlap with the orthographic projection of the light conversion layer 20 on the transparent substrate 10 is the pad area 32, which is electrically connected to the external circuit.

[0052] In this embodiment, the light source 30 emits light only at a position corresponding to the light conversion layer 20 , which can improve the utilization rate of the light source 30 .

[0053] Specifically, the pad areas 32 are located on both sides of the light-emitting area 31, one of the pad areas 32 is electrically connected to the first metal trace 323 through the first lead 321, and the other pad area 32 is electrically connected to the second metal trace 324 through the second lead 322. One of the first lead 321 and the second lead 322 is the positive electrode, and the other is the negative electrode. Correspondingly, the anode metal trace electrically connected to the positive lead and the cathode metal trace electrically connected to the negative lead are electrically connected to the external circuit through the metal traces.

[0054] Furthermore, if Figure 1 、 Figure 2As shown, the backlight module further includes a first encapsulation layer 40 disposed on the side of the second reflective layer 13 and the light conversion layer 20 away from the transparent substrate 10. The first encapsulation layer 40 encapsulates the light conversion layer 20 and the second reflective layer 13, thereby protecting the light conversion layer 20 and the second reflective layer 13 from oxidative corrosion caused by moisture and air.

[0055] Furthermore, a second encapsulation layer 50 is provided on a side of the light source 30 away from the transparent substrate 10. The second encapsulation layer 50 is used to independently encapsulate each light source 30. Encapsulating the light source 30 with the second encapsulation layer 50 prevents moisture and air from entering the light source 30, thereby improving the service life of the light source 30.

[0056] Specifically, the second encapsulation layer 50 may be a white oil layer. In addition to having the waterproof and anti-oxidation effects of the encapsulation layer, the white oil layer also has a certain reflective effect, further reducing the light leakage rate of the light source 30 on the white oil layer side.

[0057] In some embodiments, as Figure 1 As shown, the backlight module further includes a grating polarizer 60, which is disposed on the side of the transparent substrate 10 facing away from the second reflective layer 13 and the light conversion layer 20. The grating polarizer 60 can convert the outgoing light into linearly polarized light, thereby providing a display device including the backlight module with a higher contrast and better display quality. The grating polarizer 60 can be, but is not limited to, a metal grating polarizer 60.

[0058] This application also provides a method for manufacturing a backlight module. Figures 4-10 The figure shows a schematic diagram of the steps for manufacturing a backlight module. The steps for manufacturing the backlight module described above include at least the following steps:

[0059] S1: providing a transparent substrate 10.

[0060] S2: Etching is performed on one side of the transparent substrate 10 to form a groove 11, and at least one first reflective layer 12 is provided at the bottom of the groove 11. The orthographic projection area of ​​the first reflective layer 12 on the transparent substrate 10 is smaller than the orthographic projection area of ​​the step on the transparent substrate 10. Figure 4 、 Figure 5 shown.

[0061] Step S3: Fill the groove 11 with photoresist 15, and the photoresist 15 covers the surface of the second reflective layer 13, as shown in FIG. Figure 6 The photoresist 15 can protect the first reflective layer 12 and the second reflective layer 13 .

[0062] Step S4: Partially etch the photoresist 15 in the groove 11 to form an etching hole 16 until the bottom surface of the groove 11 is exposed, and the unetched photoresist 15 covers the surface of the first reflective layer 12 and the second reflective layer 13. Figure 7 shown.

[0063] S5: The transparent substrate 10 is further etched through the etching hole 16 to form a stepped groove 11. The cross-sectional area of ​​the groove 11 gradually increases along the direction close to the opening of the groove 11, and at least one first reflective layer 12 is provided at the bottom of the groove 11. The orthographic projection area of ​​the first reflective layer 12 on the transparent substrate 10 is smaller than the orthographic projection area of ​​the groove 11 at the step on the transparent substrate 10. Figure 8 and Figure 9 shown.

[0064] S6: Repeat steps S3-S5 until a stepped groove 11 meeting the requirements is formed. Figure 10 shown.

[0065] S7: forming a light conversion layer 20 in the stepped groove 11, such as Figure 11 shown.

[0066] S8: forming a second reflective layer 13 on one side of the transparent substrate 10. The second reflective layer 13 is provided on one side of the transparent substrate between adjacent grooves 11 and is provided on the same side as the grooves 11. The second reflective layer 13 can be produced simultaneously with the first reflective layer 12, further simplifying the production process. Figure 5 shown.

[0067] S9: A first encapsulation layer 40 is formed on the side of the second reflective layer 13 and the light conversion layer 20 away from the transparent substrate 10 to encapsulate the second reflective layer 13 and the light conversion layer 20. Figure 12 shown.

[0068] S10: A light source 30 is arranged on the side of the first encapsulation layer 40 away from the transparent substrate 10, and the orthographic projection of the light source 30 on the transparent substrate 10 at least partially overlaps with the orthographic projection of the light conversion layer 20 on the transparent substrate 10, such as Figure 13 shown.

[0069] In the backlight module manufactured by this method, since the light conversion layer 20 is disposed within the stepped groove 11, the light conversion layer 20 does not occupy additional space, which helps to reduce the thickness of the backlight module. The first reflective layer 12 provided on each step can transmit light irradiated by the light source 30 to the first reflective layer 12 through the other side of the transparent substrate 10 after multiple reflections. This multiple transmission allows the transmitted light to be transmitted in various directions, covering a wider area, thereby achieving a uniform light output effect and improving the light output uniformity of the backlight module. The second reflective layer 13 is used to reflect the light reflected by the light conversion layer 20, so that the light is transmitted through the side of the transparent substrate 10 facing away from the second reflective layer 13, thereby improving light output efficiency.

[0070] It should be noted that in Figure 9 、 Figure 10 In the process of continuing to form the stepped groove 11, the process of coating the first reflective layer 12 and the second reflective layer 13 with photoresist 15 is omitted. In order to avoid the etching process affecting the first reflective layer 12 and the second reflective layer 13, photoresist 15 is first coated before each step of etching the transparent substrate 10, and then the photoresist 15 is etched to form an etching hole 16.

[0071] A second aspect of the present application provides a display device, which includes the backlight module described above.

[0072] Because the light conversion layer 20 of the backlight module included in the display device is disposed within the stepped groove 11, the light conversion layer 20 does not occupy additional space, which helps reduce the thickness of the backlight module. The first reflective layer 12 provided on each step can transmit light irradiated by the light source 30 to the first reflective layer 12 through the other side of the transparent substrate 10 after multiple reflections. After multiple transmissions, the transmitted light can be transmitted in various directions, covering a wider area, thereby achieving a uniform light output effect and improving the uniformity of light output from the backlight module. The second reflective layer 13 is used to reflect the light reflected by the light conversion layer 20, so that the light is transmitted through the side of the transparent substrate 10 facing away from the second reflective layer 13, thereby improving light output efficiency.

[0073] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0074] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A backlight module, characterized in that: The backlight module includes: A transparent substrate, wherein a plurality of grooves are provided on one side of the transparent substrate, wherein sidewalls of the grooves are arranged in a stepped manner, each step is provided with at least one first reflective layer, and an orthographic projection area of ​​the first reflective layer on the same step on the transparent substrate is smaller than an orthographic projection area of ​​the groove where the step is located on the transparent substrate; a light conversion layer, wherein the light conversion layer is filled in the groove; a plurality of luminous light sources, the luminous light sources being located on a side of the light conversion layer away from the transparent substrate, wherein the orthographic projections of the luminous light sources on the transparent substrate at least partially overlap with the orthographic projection of the light conversion layer on the transparent substrate; The second reflective layer is arranged on one side of the transparent substrate between adjacent grooves and is arranged on the same side as the grooves.

2. The backlight module according to claim 1, wherein: The cross-sectional area of ​​the groove increases gradually along the direction approaching the groove opening; the orthographic projections of the first reflective layer of each level of step on the transparent substrate do not overlap.

3. The backlight module according to claim 2, wherein: The inner edge of the first reflective layer at the bottom of a step away from the bottom of the groove has an orthographic projection on the transparent substrate flush with the outer edge of the first reflective layer at the next step.

4. The backlight module according to claim 3, wherein: The first reflective layer at the bottom of the groove is provided at the center of the bottom of the groove.

5. The backlight module according to claim 1, wherein: The side wall of the groove includes at least two steps.

6. The backlight module according to claim 1, wherein: A continuous convex structure or a discontinuous convex structure is provided on one side of the transparent substrate, and the second reflective layer is provided on a side of the continuous convex structure or the discontinuous convex structure away from the transparent substrate, and the orthographic projection of the continuous convex structure or the discontinuous convex structure on the transparent substrate overlaps with the orthographic projection of the second reflective layer on the transparent substrate.

7. The backlight module according to any one of claims 1 to 6, characterized in that: The first reflective layer extends beyond the step by a distance of 0 μm to 100 μm, and the second reflective layer covers the openings of the grooves on two adjacent sides by a length of 0 μm to 100 μm.

8. The backlight module according to any one of claims 1 to 6, characterized in that: The light conversion layer is a quantum dot conversion layer or a fluorescent color conversion layer, and the first reflective layer and the second reflective layer are single-layer reflective layers or composite reflective layers.

9. The backlight module according to any one of claims 1 to 6, characterized in that: The portion where the orthographic projection of the luminous light source on the transparent substrate overlaps with the orthographic projection of the light conversion layer on the transparent substrate is a luminous area, and the portion where the orthographic projection of the luminous light source on the transparent substrate does not overlap with the orthographic projection of the light conversion layer on the transparent substrate is a pad area, and the pad area is electrically connected to an external circuit.

10. The backlight module according to any one of claims 1 to 6, characterized in that: The backlight module also includes a first packaging layer arranged on the side of the second reflective layer and the light conversion layer away from the transparent substrate; a second packaging layer is provided on the side of the light source away from the transparent substrate, and the second packaging layer is used to independently package each of the light sources.

11. The backlight module according to claim 10, wherein: The second encapsulation layer is a white oil layer.

12. The backlight module according to any one of claims 1 to 6, characterized in that: The backlight module further includes a grating polarizer, which is arranged on a side of the transparent substrate facing away from the second reflective layer and the light conversion layer.

13. A display device, characterized in that: The display device comprises the backlight module according to any one of claims 1 to 12.

Images