Backlight module and manufacturing method therefor, and display device

Abstract

A backlight module and a manufacturing method therefor, and a display device. The backlight module comprises: a transparent substrate, which comprises a first surface and a second surface opposite each other, wherein the first surface is provided with a plurality of first grooves, a plurality of second grooves corresponding to the plurality of first grooves on a one-to-one basis are distributed on the second surface, and the orthographic projections of the second grooves on the first surface are located within the orthographic projections of the corresponding first grooves on the first surface; a plurality of light-emitting devices, which are accommodated in the first grooves, wherein light-emergent surfaces of the light-emitting devices face towards the second surface; and a light-shielding structure, which is located on the side of the first grooves away from the first surface, wherein the light-shielding structure comprises a first sub-light-shielding structure, which is accommodated in the second grooves.

Description

A backlight module, its manufacturing method, and a display device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410823967.3, filed on June 25, 2024, with the invention title “A Backlight Module and its Manufacturing Method, Display Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of display technology, and in particular to a backlight module, its manufacturing method, and a display device. Background Technology

[0004] Existing liquid crystal display (LCD) backlight modules require layers such as prism film, diffusion film, and anti-reflection film to improve the uniformity of light output. However, these layers make the backlight module thicker, resulting in a significant thickness disadvantage for LCD display panels compared to OLED display panels.

[0005] If the uniformity of light output from the backlight module can be improved while the thickness of the backlight module in the LCD display panel can be reduced, so that the thickness of the LCD display panel can be comparable to that of the OLED display panel, the low-cost advantage of the LCD display panel can be fully utilized.

[0006] Therefore, how to improve the uniformity of light output from the backlight module while reducing its thickness has become a pressing technical problem. Summary of the Invention

[0007] This disclosure provides a backlight module, its manufacturing method, and a display device to solve the technical problems of low light uniformity and large thickness in the prior art.

[0008] In a first aspect, to solve the above-mentioned technical problems, embodiments of this disclosure provide a backlight module, including:

[0009] A transparent substrate; the transparent substrate includes a first surface and a second surface opposite to each other, the first surface has a plurality of first grooves, and the second surface has a plurality of second grooves that correspond one-to-one with the plurality of first grooves, the orthographic projection of the second groove on the first surface is located within the orthographic projection of the corresponding first groove on the first surface;

[0010] Multiple light-emitting devices are housed within the first groove; wherein the light-emitting surface of each light-emitting device faces the second surface.

[0011] A light-shielding structure is located on the side of the first groove away from the first surface; the light-shielding structure includes a first sub-light-shielding structure, which is accommodated within the second groove.

[0012] In one possible implementation, the first sub-shading structure has a slit extending through the thickness of the first sub-shading structure, the slit dividing the first sub-shading structure into multiple parts of the same shape.

[0013] One possible implementation is that the gap includes a plurality of sub-gaps;

[0014] The plurality of sub-slits are connected in the central region of the first sub-reflective structure.

[0015] In one possible implementation, the second surface is divided into a plurality of consecutive unit regions, and the orthographic projection of each portion onto the second surface lies within one of the unit regions;

[0016] The light-shielding structure also includes:

[0017] Multiple second sub-shading structures are located on the second surface, and each of the multiple unit areas surrounding the first sub-shading structure contains one second sub-shading structure; the overlapping area between the portion and the corresponding unit area is greater than the overlapping area between the second sub-shading structure and the corresponding unit area;

[0018] In the multiple unit areas between two adjacent first sub-shading structures, the overlapping area of ​​the second sub-shading structure and the corresponding unit area gradually decreases from both ends toward the center line, and the spacing between two adjacent second sub-shading structures gradually increases from both ends toward the center; the two ends are two adjacent first sub-shading structures, and the center is the center of the line connecting the two ends.

[0019] In one possible implementation, the shape of the second sub-shading structure is the same as the shape of the portion projected onto the second surface.

[0020] One possible implementation of the transparent substrate includes:

[0021] Substrate layer;

[0022] At least one nanoimprint adhesive layer is located on one side of the substrate layer; at least one of the first groove and the second groove is located on the nanoimprint adhesive layer.

[0023] In one possible implementation, the substrate layer and the nanoimprint adhesive layer have the same refractive index.

[0024] In one possible implementation, the backlight module further includes:

[0025] The color transfer layer is located on the side of the light-shielding structure away from the transparent substrate, or on the light-emitting surface.

[0026] In one possible implementation, the backlight module further includes:

[0027] The reflective structure is located on the side of the transparent substrate away from the first sub-shielding structure.

[0028] In one possible implementation, the bottom surface of the first groove is a plane; the side surface of the first groove is an arc surface.

[0029] In one possible implementation, the bottom surface is rectangular in shape, with the longer side of the rectangle being greater than the length of the light-emitting device.

[0030] One possible implementation is that the shape of the first groove includes:

[0031] Semi-ellipsoidal surface.

[0032] In one possible implementation, the second groove is shaped as a hemispherical surface or a conical surface.

[0033] In one possible implementation, the luminous flux emitted by the light-emitting device is distributed in the form of 1 / cosθ, where θ is the emission angle of the light-emitting device; the light emitted by the light-emitting device is projected onto the second surface to form the illumination area of ​​the light-emitting device;

[0034] The illumination areas of two adjacent light-emitting devices are mutually tangent or intersecting.

[0035] In one possible implementation, the illumination areas of two adjacent light-emitting devices intersect;

[0036] The center line connecting any four adjacent light-emitting devices forms a square, and the intersection of the illumination areas of the four light-emitting devices is the center of the square.

[0037] Alternatively, the center line connecting any three adjacent light-emitting devices can form an equilateral triangle, and the intersection of the illumination areas of the three light-emitting devices is the center of the equilateral triangle.

[0038] Secondly, embodiments of this disclosure provide a method for manufacturing a backlight module, including:

[0039] A transparent substrate is provided; wherein the transparent substrate includes opposing first and second surfaces;

[0040] A plurality of first grooves are formed on the first surface, and a plurality of second grooves corresponding one-to-one with the plurality of first grooves are formed on the second surface; wherein the orthographic projection of the second groove on the first surface is located within the corresponding first groove;

[0041] In the transparent substrate, a light-shielding structure is formed on the side of the first groove away from the first surface; the light-shielding structure includes a first sub-light-shielding structure, which is housed within the second groove;

[0042] Multiple light-emitting devices are bonded to the multiple first grooves respectively, so that the light-emitting devices are housed in the first grooves; wherein the light-emitting surface of the light-emitting device faces the second surface.

[0043] One possible implementation includes forming a plurality of first grooves on the first surface and forming a plurality of second grooves on the second surface that correspond one-to-one with the plurality of first grooves, comprising:

[0044] A first mask is formed on the first surface, and a second mask is formed on the second surface;

[0045] The transparent substrate having the first mask and the second mask is etched to obtain the plurality of first grooves and the plurality of second grooves.

[0046] One possible implementation involves etching a transparent substrate having a first mask and a second mask to obtain the plurality of first grooves and the plurality of second grooves, including:

[0047] A transparent substrate with the first mask and the second mask is placed in a hydrofluoric acid solution for a first etching to obtain the first groove and the second groove with the same depth;

[0048] After the transparent substrate with the second groove is placed back into the hydrofluoric acid solution, the second groove is etched a second time to obtain a second groove with a depth greater than that of the first groove.

[0049] In one possible implementation, the transparent substrate includes a substrate layer and at least one nanoimprint adhesive layer, wherein the nanoimprint adhesive layer is located on one side of the substrate layer;

[0050] The method includes forming a plurality of first grooves on the first surface and forming a plurality of second grooves on the second surface that correspond one-to-one with the plurality of first grooves, comprising:

[0051] Nanoimprinting is performed on one side having the nanoimprint adhesive layer to obtain the plurality of first grooves or the plurality of second grooves located in the nanoimprint adhesive layer.

[0052] Thirdly, embodiments of this disclosure provide a display device, which includes a backlight module as described in the first aspect. Attached Figure Description

[0053] Figure 1 is a schematic diagram of a backlight module provided in an embodiment of this disclosure;

[0054] Figure 2 is a schematic diagram of a light-emitting device projecting a light beam onto a second surface according to an embodiment of this disclosure;

[0055] Figure 3 is a cross-sectional view of a transparent substrate provided in an embodiment of this disclosure;

[0056] Figure 4 is a cross-sectional view of another transparent substrate provided in an embodiment of this disclosure;

[0057] Figure 5 is a cross-sectional view of another transparent substrate provided in an embodiment of this disclosure;

[0058] Figures 6-8 are schematic diagrams of the structure of a transparent substrate provided in an embodiment of this disclosure;

[0059] Figures 9 and 10 are schematic diagrams of another backlight module provided in the embodiments of this disclosure;

[0060] Figure 11 is a top view of a first sub-shielding structure provided in an embodiment of this disclosure;

[0061] Figure 12 is a top view of another first sub-shielding structure provided in an embodiment of this disclosure;

[0062] Figure 13 is a top view of another first sub-shading structure provided in an embodiment of this disclosure;

[0063] Figure 14 is a top view of a backlight module provided in an embodiment of this disclosure;

[0064] Figures 15-17 are top views of another backlight module provided in the embodiments of this disclosure;

[0065] Figures 18 and 19 are schematic diagrams of another backlight module provided in the embodiments of this disclosure;

[0066] Figure 20 is a schematic diagram of another backlight module provided in an embodiment of this disclosure;

[0067] Figure 21 is a schematic diagram of the light intensity distribution corresponding to the 1 / cosθ distribution of light emitted by a light-emitting device provided in an embodiment of this disclosure;

[0068] Figures 22 and 23 are schematic diagrams showing the distribution of the illumination area corresponding to the light-emitting device in a backlight module according to an embodiment of the present disclosure;

[0069] Figure 24 is a calculation model for uniform light emission of a light-emitting device provided in an embodiment of this disclosure;

[0070] Figure 25 is an enlarged view of the light-emitting device in Figure 23 provided in an embodiment of this disclosure;

[0071] Figure 26 is a schematic diagram of light emission from a light-emitting device provided in an embodiment of this disclosure, showing a light distribution of 1 / cosθ.

[0072] Figures 27 and 28 are schematic diagrams showing the distribution of the illumination area of ​​the light-emitting device pair in another backlight module provided in the embodiments of this disclosure;

[0073] Figure 29 is a schematic diagram of another backlight module provided in an embodiment of this disclosure;

[0074] Figure 30 is a schematic diagram of the fabrication of a backlight module provided in an embodiment of this disclosure;

[0075] Figure 31 is a schematic diagram of the fabrication process for forming a first groove and a second groove according to an embodiment of this disclosure.

[0076] Reference numerals: 1. Transparent substrate; 11. Substrate layer; 12. Nanoimprint adhesive layer; 2. Light-emitting device; 3. Light-shielding structure; 31. First sub-light-shielding structure; 2a. Light-emitting surface; 2b. Projection area; 311. Central region; 31O. First direction X; Second direction Y; 32. Second sub-light-shielding structure; 32. Unit area S; 4. Color conversion layer; 5. Reflective structure; 6. Electrode; 7. Light-diffusing film. Detailed Implementation

[0077] This disclosure provides a backlight module, its manufacturing method, and a display device to solve the technical problems of low light uniformity and large thickness in the prior art.

[0078] It should be understood that the specific structural and functional details disclosed in the embodiments of this disclosure are merely representative and are intended to describe exemplary embodiments of this disclosure. However, this disclosure can be implemented in many alternative forms and should not be construed as being limited solely to the embodiments set forth herein.

[0079] In the description of this disclosure, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0080] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0081] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms “a” and “an” as used herein are also intended to include the plural. It should also be understood that the terms “comprising” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, without excluding the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0082] The term "and / or" in the embodiments of this disclosure is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0083] To make the above-described objects, features, and advantages of this disclosure more apparent and understandable, the disclosure will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the disclosure more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction as described in this disclosure are illustrative of the accompanying drawings, but changes may be made as needed, and all such changes are included within the scope of protection of this disclosure. The accompanying drawings of this disclosure are for illustrative purposes only and do not represent actual scale.

[0084] It should be noted that specific details are set forth in the following description to provide a full understanding of this disclosure. However, this disclosure can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this disclosure. Therefore, this disclosure is not limited to the specific embodiments disclosed below. The following descriptions are preferred embodiments for carrying out this disclosure; however, these descriptions are for the purpose of illustrating the general principles of this disclosure and are not intended to limit the scope of this disclosure. The scope of protection of this disclosure shall be determined by the appended claims.

[0085] The following description, in conjunction with the accompanying drawings, details a backlight module, its manufacturing method, and a display device provided in the embodiments of this disclosure.

[0086] Please refer to Figure 1, which is a structural schematic diagram of a backlight module provided in an embodiment of this disclosure. The backlight module includes:

[0087] A transparent substrate 1 includes a first surface 1a and a second surface 1b opposite to each other. The first surface 1a has a plurality of first grooves 1ac, and the second surface 1b has a plurality of second grooves 1bc corresponding one-to-one with the first grooves 1ac. The orthographic projection of a second groove 1bc onto the first surface 1a lies within the orthographic projection of its corresponding first groove 1ac onto the first surface 1a. Ideally, the center of the orthographic projection of a first groove 1ac onto the first surface 1a coincides with the center of the orthographic projection of a second groove 1bc onto the first surface 1a. However, in actual production, due to manufacturing errors, a slight offset within the error range is permissible between the centers of the first groove 1ac and the second groove 1bc onto the first surface 1a. The transparent substrate 1 can be a glass substrate, a resin substrate, etc. The height of the transparent substrate 1 ranges from 0.2mm to 1mm, for example, the height of the transparent substrate 1 can be 0.7mm.

[0088] Multiple light-emitting devices 2 are housed within a first groove 1ac; wherein the light-emitting surface 2a of the light-emitting device 2 faces the second surface 1b.

[0089] The light-shielding structure 3 is located on the side of the first groove 1ac away from the first surface 1a; the light-shielding structure 3 includes a first sub-light-shielding structure 313, which is housed in the second groove 1bc.

[0090] In some embodiments, the light-shielding structure 3 can be a distributed bragg reflector (DBR). The light-shielding structure 3 can also be a film layer made of a single material or composite material, such as silver (Ag), copper (Cu), titanium (Ti), etc.

[0091] Please refer to Figure 2, which is a schematic diagram of a light-emitting device projecting a light beam onto a second surface according to an embodiment of this disclosure. Since the light-emitting device 2 emits a light beam at an emission angle (denoted as θ) and projects it onto the second surface 1b to form a corresponding projection area 2b, the light located near the center of the projection area 2b can be called the small-angle light of the light-emitting device 2. The angle range of the small-angle light is -30°≤θ≤30°. The light emitted by the light-emitting device 2 at an angle other than the small-angle light is called the large-angle light. The angle range of the large-angle light is -90≤θ<30° and 30°<θ≤90°.

[0092] Without special design of the peak structure of the light-emitting device 2, the light intensity of the small-angle light emitted by the light-emitting device 2 is usually stronger, while the light intensity of the large-angle light is weaker, resulting in poor light uniformity of the backlight module. However, this disclosure uses a light-shielding structure 3 placed in the second groove 1bc above the light-emitting device 2 to block the light emitted by the corresponding light-emitting device 2 from reaching the vicinity of the center of the corresponding projection area 2b, thereby reducing the light intensity near the center of the projection area 2b and improving the light uniformity of the backlight module. Furthermore, since the light-emitting device 2 and the first sub-light-shielding structure 313 that improves the light uniformity of the backlight module are both located in the groove in the transparent substrate 1, the thickness of the backlight module can be effectively reduced, achieving the technical effect of greatly reducing the thickness of the backlight module while improving the light uniformity of the backlight module.

[0093] Please refer to Figure 3, which is a cross-sectional view of a transparent substrate provided in an embodiment of this disclosure. The bottom surface 1acd of the first groove 1ac is a plane; the side surface 1acc of the first groove 1ac is an arc surface.

[0094] By setting the bottom surface 1acd of the first groove 1ac as a plane and setting the side surface 1acc of the first groove 1ac as an arc surface, it is convenient to place the light-emitting device 2 in the first groove 1ac and to facilitate the light-emitting device 2 to emit light to the second surface 1b.

[0095] In some embodiments, the bottom surface 1acd of the first groove 1ac is rectangular in shape, and the long side L of the rectangle is greater than the length L' of the light-emitting device 2, so that the edge allows the light-emitting device 2 to be accommodated in the first groove 1ac.

[0096] Please refer to Figure 4, which is a cross-sectional view of another transparent substrate provided in an embodiment of this disclosure. The shape of the first groove 1ac includes:

[0097] The semi-ellipsoidal surface. The minor axis of the semi-ellipsoidal surface extends in the same direction as the thickness direction of the transparent substrate 1, and the major axis of the semi-ellipsoidal surface is in the same plane as the first surface 1a.

[0098] By setting the first groove 1ac as a semi-ellipsoidal surface, the light-emitting device 2 can be accommodated, and the manufacturing difficulty of the first groove 1ac can be reduced.

[0099] As shown in Figures 3 and 4, the second groove 1bc is hemispherical in shape; Figure 5 shows a cross-sectional view of another transparent substrate provided in this embodiment of the present disclosure. The second groove 1bc can also be conical in shape, with the bottom of the conical surface and the second surface 1b on the same plane.

[0100] By setting the shape of the second groove 1bc to a conical surface, the outer surface shape of the first sub-shielding structure 313 set in the second groove 1bc can also be a conical surface, thereby increasing the amount of light reflected at small angles and thus improving the uniformity of light output of the backlight module.

[0101] Please refer to Figures 6-8 for schematic diagrams of a transparent substrate provided in an embodiment of this disclosure. Transparent substrate 1 includes:

[0102] Substrate layer 11;

[0103] At least one nanoimprint adhesive layer 12 is located on one side of the substrate layer 11; at least one of the first groove 1ac and the second groove 1bc is located on the nanoimprint adhesive layer 12.

[0104] The substrate layer 11 can be made of glass, resin, or other materials. As shown in Figures 7 and 8, the nanoimprint adhesive layer 12 can be located on one side of the substrate layer 11, or as shown in Figure 9, it can be located on both sides of the substrate layer 11.

[0105] As shown in Figure 6, the nanoimprint adhesive layer 12 is disposed on the side of the substrate layer 11 near the second groove 1bc, and the second groove 1bc can be formed on the nanoimprint adhesive layer 12 by nanoimprinting; as shown in Figure 7, the nanoimprint adhesive layer 12 is disposed on the side of the substrate layer 11 near the first groove 1ac, and the first groove 1ac can be formed on the nanoimprint adhesive layer 12 by nanoimprinting; as shown in Figure 8, the nanoimprint adhesive layer 12 is disposed on both sides of the substrate layer 11, and the first groove 1ac and the second groove 1bc can be formed on the nanoimprint adhesive layer 12 by nanoimprinting, thereby quickly forming the first groove 1ac and the second groove 1bc, reducing the process difficulty, and improving the manufacturing accuracy of the first groove 1ac and the second groove 1bc.

[0106] By setting the transparent substrate 1 as a substrate layer 11 and a nanoimprint adhesive layer 12 located on at least one side of the substrate layer 11, a first groove 1ac and a second groove 1bc can be formed on the nanoimprint adhesive layer 12 by nanoimprint technology, thereby reducing the manufacturing difficulty of the first groove 1ac and the second groove 1bc and improving manufacturing efficiency and manufacturing precision.

[0107] In some embodiments, the refractive indices of the substrate layer 11 and the nanoimprint adhesive layer 12 may be different.

[0108] In other embodiments, the refractive indices of the substrate layer 11 and the nanoimprint adhesive layer 12 can be the same. By setting the refractive indices of the substrate layer 11 and the nanoimprint adhesive layer 12 to be the same, phenomena such as refraction or total reflection at the interface between the substrate layer 11 and the nanoimprint adhesive layer 12 can be avoided, thus eliminating the need to add extra design complexity to avoid refraction or total reflection.

[0109] Please refer to Figures 9 and 10 for a schematic diagram of another backlight module provided in the embodiments of this disclosure. In this backlight module, the first sub-shielding structure 313 has a gap 31a that penetrates the thickness of the first sub-shielding structure 313. The gap 31a divides the first sub-shielding structure 313 into multiple parts 311 of the same shape.

[0110] As shown in Figure 9, the second groove 1bc is hemispherical in shape, and the first sub-shading structure 313 housed in the second groove 1bc is also hemispherical in shape. If the first sub-shading structure 313 in Figure 9 has two parts 311, the first sub-shading structure 313 is divided into two 1 / 4 spherical surfaces by the gap 31a; or, if the first sub-shading structure 313 in Figure 9 has four parts 311, the first sub-shading structure 313 is divided into four 1 / 8 spherical surfaces by the gap 31a.

[0111] As shown in Figure 10, the second groove 1bc is conical in shape, and the first sub-shading structure 313, which is housed in the second groove 1bc, is also conical in shape. If the first sub-shading structure 313 in Figure 10 has two parts 311, the first sub-shading structure 313 is divided into two 1 / 2 conical surfaces by the gap 31a; or, if the first sub-shading structure 313 in Figure 10 has four parts 311, the first sub-shading structure 313 is divided into four 1 / 4 conical surfaces by the gap 31a.

[0112] By providing a slit 31a that penetrates the thickness of the first sub-light-shielding structure 313 in the first sub-light-shielding structure 313, part of the light emitted by the light-emitting device 2 can be emitted from near the center of the corresponding projection area 2b, thereby preventing the light intensity near the center of the projection area 2b from being too weak and further improving the light emission uniformity of the backlight module.

[0113] Please refer to Figure 11, which is a top view of a first sub-slit structure provided in an embodiment of this disclosure. The slits 31a in the first sub-slit structure 313 include a plurality of sub-slits 31a1;

[0114] Multiple sub-slits 31a1 are connected in the central region 31O of the first sub-reflective structure 5.

[0115] As shown in Figure 11, the top view of the first sub-shading structure 313 is square. The gap 31a in the first sub-shading structure 313 is composed of two sub-gaps 31a1 extending along the first direction X and the second direction Y respectively. These two sub-gaps 31a1 are connected in the central region 31O of the first sub-shading structure 313, dividing the first sub-shading structure 313 into four parts 311. The top view of each part 311 is square.

[0116] In some other embodiments, the top view shape of the first sub-shading structure 313 can also be rectangular, and the corresponding structural form is similar to that shown in FIG11, which will not be described again here.

[0117] It should be understood that Figure 11 only schematically shows two sub-slits 31a1. In actual applications, more sub-slits 31a1 can be set to increase the amount of light emitted from the area blocked by the first sub-shading structure 313.

[0118] Please refer to Figure 12, which is a top view of another first sub-light-shielding structure provided in this embodiment. The top view shape of the sub-slit 31a1 that makes up the slit 31a in the first sub-light-shielding structure 313 can also be irregular, so that the top view shape of the slit 31a is a cross-shaped star, dividing the first sub-light-shielding structure 313 into 4 parts 311, and the top view shape of each part 311 is circular.

[0119] Please refer to Figure 13, which is a top view of another first sub-light-shielding structure provided in this embodiment of the present disclosure. The slit 31a of the first sub-light-shielding structure 313 consists of a ring-shaped sub-slit 31a1 located in the central region 31O and a plurality of sub-slits 31a1 connected to the ring-shaped sub-slit 31a1 in a strip shape. The slit 31a in Figure 13 divides the first sub-light-shielding structure 313 into 7 parts 311 of the same shape, among which the part 311 surrounded by the ring-shaped sub-slits 31a1 has the largest area, and the shape of each part 311 is a regular hexagon.

[0120] In other embodiments, the gap 31a in the first sub-shading structure 313 may also be in other forms. The first sub-shading structure 313 is divided into multiple parts 311 by the gap 31a. Each part 311 may also be a triangle, a parallelogram, etc., and there are no specific limitations.

[0121] Please refer to Figure 14, which is a top view of a backlight module provided in an embodiment of this disclosure.

[0122] The second surface 1b is divided into multiple consecutive unit areas S, and the orthographic projection of each part 311 on the second surface 1b lies within a unit area S; each unit area S is the same size.

[0123] The light-shielding structure 3 also includes:

[0124] Multiple second sub-shading structures 323 are located on the second surface 1b, and each of the multiple unit areas S surrounding the first sub-shading structure 313 contains one second sub-shading structure 323; the overlapping area S1 of part 311 and the corresponding unit area S is greater than the overlapping area S2 of the second sub-shading structure 323 and the corresponding unit area S.

[0125] In the multiple unit regions S between two adjacent first sub-shading structures 313, the overlapping area of ​​the second sub-shading structure 323 and the corresponding unit region S gradually decreases from both ends toward the center line, and the spacing between two adjacent second sub-shading structures 323 gradually increases from both ends toward the center; the two ends are two adjacent first sub-shading structures 313, and the center is the center of the line connecting the two ends.

[0126] As shown in Figure 14, among the four adjacent second sub-shading structures 323 in the same row between two adjacent first sub-shading structures 313, the area of ​​the second sub-shading structures 323 at both ends is S2, and the area of ​​the two middle second sub-shading structures 323 is S'2, where S2 > S'2. The distance between two adjacent second sub-shading structures 323 at both ends is d1, and the distance between two adjacent second sub-shading structures 323 in the middle is d2. <d2。

[0127] As shown in Figure 14, since the first sub-shielding structure 313 overlaps with the light-emitting device 2, the orthographic projection of the first sub-shielding structure 313 on the second surface 1b is located at the center of the projection area 2b of the light beam emitted by the light-emitting device 2 on the second surface 1b. The second sub-shielding structure 323, which is closer to the first sub-shielding structure 313, is closer to the center of the projection area 2b. This disclosure sets the overlap area S1 of each part 311 of the first sub-shielding structure 313 with the corresponding unit area S to be greater than the overlap area S2 of the second sub-shielding structure 323 with the corresponding unit area S. It also makes the overlap area of ​​the corresponding unit areas S of the multiple second sub-shielding structures 323 in the same row between two adjacent first sub-shielding structures 313 gradually decrease from both ends to the center line and gradually increase the spacing. In this way, the area of ​​the second sub-shielding structure 323, which is closer to the center of the projection area 2b of the light-emitting device 2, is larger and blocks more light. This allows less small-angle light to pass through the second surface 1b and more large-angle light to pass through the second surface 1b, thereby improving the uniformity of the backlight module.

[0128] In the embodiments provided in this disclosure, by dividing the second surface 1b into a continuous plurality of unit regions S, and setting a plurality of second sub-shielding structures 323 on the second surface 1b, these second sub-shielding structures 323 are distributed around the first sub-shielding structure 313. The overlap area S1 of each part 311 of the first sub-shielding structure 313 with the corresponding unit region S is set to be greater than the overlap area S2 of the second sub-shielding structure 323 with the corresponding unit region S. The overlap area of ​​the corresponding unit region S of the plurality of second sub-shielding structures 323 in the same row between two adjacent first sub-shielding structures 313 gradually decreases from both ends toward the center line and the spacing gradually increases. Thus, by utilizing the first sub-shielding structure 313 and the plurality of second sub-shielding structures 323, the light energy emitted by the light-emitting device 2 can be uniformly emitted from the second surface 1b, thereby providing uniformity of backlight module light output.

[0129] In some embodiments, the shape of the orthographic projection of the second sub-shading structure 323 onto the second surface 1b may differ from the shape of the orthographic projection of each portion 311 of the first sub-shading structure 313 onto the second surface 1b. For example, if the orthographic projection of each portion 311 of the first sub-shading structure 313 onto the second surface 1b is a square, the orthographic projection of the second sub-shading structure 323 onto the second surface 1b may be a rectangle or other shapes, which are not limited here.

[0130] Please refer to Figures 15-17, which are top views of another backlight module provided in this embodiment of the present disclosure. The shape of the orthographic projection of the second sub-shielding structure 323 on the second surface 1b can be the same as the shape of the orthographic projection of each part 311 in the first sub-shielding structure 313 on the second surface 1b. As shown in Figure 15, the orthographic projection shape of each part 311 in the first sub-shielding structure 313 on the second surface 1b is a square, and the orthographic projection shape of the second sub-shielding structure 323 on the second surface 1b is also a square; as shown in Figure 16, the orthographic projection shape of each part 311 in the first sub-shielding structure 313 on the second surface 1b is a circle, and the orthographic projection shape of the second sub-shielding structure 323 on the second surface 1b is also a circle; as shown in Figure 17, the orthographic projection shape of each part 311 in the first sub-shielding structure 313 on the second surface 1b is a regular hexagon, and the orthographic projection shape of the second sub-shielding structure 323 on the second surface 1b is also a regular hexagon.

[0131] As shown in Figures 15 and 17, the shape of the unit region S can be the same as the shape of the second sub-shading structure 323, or as shown in Figure 16, the shape of the unit region S can be different from the shape of the second sub-shading structure 323.

[0132] It should be understood that, for ease of observation, Figures 15-17 only show a first sub-shading structure 313 and multiple second sub-shading structures 323 distributed around the first sub-shading structure 313. They can be regarded as part of the backlight module rather than the whole.

[0133] In the embodiments provided in this disclosure, by setting the shape of the second sub-shielding structure 323 in the orthographic projection of the second surface 1b to be the same as the shape of the orthographic projection of each part 311 in the first sub-shielding structure 313 in the second surface 1b, it is convenient to arrange the second sub-shielding structure 323, so that the second sub-shielding structure 323 distributed around the first sub-shielding structure 313 presents a uniformly varied shielding area, which is convenient to improve the light output uniformity of the backlight module.

[0134] In some embodiments, the color of the light emitted by the light-emitting device 2 is the same as the color of the light that the backlight module needs to emit. For example, if the light emitted by the light-emitting device 2 is white light, the light that the backlight module needs to emit is also white light.

[0135] In other embodiments, the color of the light emitted by the light-emitting device 2 is not the color of the light that the backlight module needs to emit.

[0136] Please refer to Figures 18 and 19 for a structural schematic diagram of another backlight module provided in an embodiment of this disclosure. The backlight module further includes:

[0137] The color transfer layer 4 is located on the side of the light-shielding structure 3 away from the transparent substrate 1, as shown in Figure 18, or on the light-emitting surface 2a, as shown in Figure 19.

[0138] The color conversion layer 4 is used to convert the color of the light emitted by the light-emitting device 2 into the color of the light that the backlight module needs to emit. For example, if the light emitted by the light-emitting device 2 is blue and the backlight module needs to emit white light, the color conversion layer 4 can convert the blue light into white light.

[0139] The material of color transfer layer 4 can be a quantum dot film or a fluorescent material.

[0140] In the embodiments provided in this disclosure, by providing a color transfer layer 4 on the side of the light-shielding structure 3 away from the transparent substrate 1, it is convenient to convert the color of the light emitted by the light-emitting device 2 into the color of the light required by the backlight module. By providing the color transfer layer 4 on the light-emitting surface 2a of the light-emitting device 2, not only can the color of the light emitted by the light-emitting device 2 be converted into the color of the light required by the backlight module, but the material required for the color transfer layer 4 can also be effectively saved, thereby effectively reducing costs.

[0141] In some embodiments, the color transfer layer 4 is disposed on the light-emitting surface 2a of the light-emitting device 2. The color transfer layer 4 is made of a high-temperature resistant quantum dot film, or the light-emitting device 2 is a low-power light-emitting device 2. This can effectively improve the uniformity of the light emitted by the backlight module.

[0142] Please refer to Figure 20, which is a schematic diagram of another backlight module provided in an embodiment of this disclosure. The backlight module further includes:

[0143] The reflective structure 5 is located on the side of the transparent substrate 1 away from the first sub-shielding structure 313.

[0144] Multiple pairs of electrodes 6, the first surface 1a of the transparent substrate 1, each pair of electrodes 6 is electrically connected to two pins of the light-emitting device 2, and the reflective structure 5 can be located on the side of the multiple pairs of electrodes 6 away from the transparent substrate 1.

[0145] The light emitted by the light-emitting device 2 is incident on the reflective structure 5 and then reflected by the light-shielding structure 3. The light is then incident on the reflective structure 5 and reflected to the second surface 1b, and then emitted from the gap 31a of the light-shielding structure 3. This can effectively increase the light output of the backlight module and improve the light utilization rate, thereby improving the uniformity of light output of the backlight module and the brightness of the backlight module.

[0146] Please refer to Figure 21, which is a schematic diagram of the light intensity distribution corresponding to the 1 / cosθ distribution of the light emitted by a light-emitting device provided in an embodiment of this disclosure, and Figures 22 and 23, which are schematic diagrams of the irradiation area distribution corresponding to the light-emitting device in a backlight module provided in an embodiment of this disclosure.

[0147] As shown in Figure 21, the light emitted by the light-emitting device 2 is distributed in the form of 1 / cosθ, where θ is the emission angle of the light-emitting device 2, that is, the angle between the light emitted by the light-emitting device 2 and the thickness direction of the transparent substrate 1; the light emitted by the light-emitting device 2 is projected onto the second surface 1b to form the illumination area of ​​the light-emitting device 2.

[0148] As shown in Figure 22, the illumination areas of two adjacent light-emitting devices 2 are mutually tangent, or as shown in Figure 23, the illumination areas of two adjacent light-emitting devices 2 intersect.

[0149] Assuming that the light emitted by the light-emitting device 2 is uniform light, please refer to Figures 24 and 25. Figure 24 is a calculation model of uniform light emission of a light-emitting device provided by an embodiment of the present disclosure, and Figure 25 is an enlarged view of the light-emitting device in Figure 24 provided by an embodiment of the present disclosure.

[0150] Assume that the light emitted by the light-emitting device 2 at an angle θ and within a range of δθ in Figure 24 illuminates the upper surface of the substrate, forming a ring with a radius of m to M. The goal is to ensure that the light intensity of the ring is consistent across any range from θ to θ+δθ. Ring light intensity = spherical ring luminous flux / ring area (1);

[0151] Where, the luminous flux of the spherical ring = L(θ)·(r·sinθ·2π)·(δθ·r) (2); L(θ) is the luminous flux emitted by the light-emitting device 2 at the emission angle θ, and r is the encapsulation radius of the light-emitting device 2; the ring area = π(M 2 +m 2 )=πh 2 [tan 2 (θ+δθ)-tan 2 (θ)] (3); h is the distance between the first surface 1a and the second surface 1b;

[0152] Since tan(θ+δθ)=(tanθ+tanδθ) / (1-tanθ·tanδθ)=tanθ+tanδθ, therefore: ring area=πh 2 2tanθ·tanδθ=2πh 2 tanθ·δθ(4).

[0153] According to formulas (1), (2) and (4), we can obtain: Ring light intensity = L(θ)·r 2 ·sinθ·δθ·2π / 2πh 2 tanθ·δθ=L(θ)cosθ / h 2 (5).

[0154] If we want the ring light intensity to be constant, then L(θ)cosθ / h 2=C. If C is to be a constant, then L(θ) must satisfy 1 / cosθ, that is, the luminous flux emitted by the light-emitting device 2 is distributed in the form of 1 / cosθ.

[0155] Therefore, by distributing the luminous flux emitted by the light-emitting device 2 in a 1 / cosθ manner, this disclosure allows the light-emitting device 2 to emit uniform light. As shown in Figure 21, if the emission angle θ of the light-emitting device 2 achieving the 1 / cosθ distribution can reach 90°, then theoretically only one light-emitting device 2 is needed to achieve completely uniform backlighting, as shown in Figure 26. Figure 26 is a schematic diagram of light emission with the light emitted by the light-emitting device in a 1 / cosθ distribution according to an embodiment of this disclosure.

[0156] Since any single light-emitting device 2 with a light emission angle close to 90° θ can achieve uniform backlighting, theoretically, any number and arrangement of such light-emitting devices 2 can be placed on the transparent substrate 1.

[0157] However, a light emission angle θ of 90° is an ideal situation. The actual light emission angle θ of the light-emitting device 2 is always smaller than 90°. Therefore, in reality, the light-emitting device 2 can only illuminate a certain range of the transparent substrate 1. Therefore, in combination with uniform light emission, the illumination areas of two adjacent light-emitting devices 2 in the backlight module can be mutually tangent as shown in Figure 22 or Figure 27, or intersecting as shown in Figure 23 or Figure 28, so that the backlight module emits light uniformly. Figures 27 and 28 are schematic diagrams of the illumination area distribution of a pair of light-emitting devices in another backlight module provided by the embodiments of this disclosure.

[0158] In the embodiments provided in this disclosure, by making the luminous flux of the light emitted by the light-emitting device 2 distributed in the form of 1 / cosθ, and by making the illumination areas of two adjacent light-emitting devices 2 mutually tangent or intersecting, the backlight module can emit light uniformly.

[0159] The illumination areas of two adjacent light-emitting devices 2 intersect;

[0160] As shown in Figure 23, the center line connecting any four adjacent light-emitting devices 2 in the plurality of light-emitting devices 2 forms a square, and the intersection of the illumination areas of the four light-emitting devices 2 is the center of the square.

[0161] As shown in Figure 28, the center line connecting any three adjacent light-emitting devices 2 in the plurality of light-emitting devices 2 forms an equilateral triangle, and the intersection of the illumination areas of the three light-emitting devices 2 is the center of the equilateral triangle.

[0162] In the embodiments provided in this disclosure, when the illumination areas of two adjacent light-emitting devices 2 intersect, the center line connecting any four adjacent light-emitting devices 2 among the plurality of light-emitting devices 2 forms a square, and the intersection point of the illumination areas of the four light-emitting devices 2 is the center of the square; or, the center line connecting any three adjacent light-emitting devices 2 among the plurality of light-emitting devices 2 forms an equilateral triangle, and the intersection point of the illumination areas of the three light-emitting devices 2 is the center of the equilateral triangle. This can increase the coverage area of ​​the illumination area of ​​the light-emitting devices 2 on the second surface 1b, thereby improving the uniformity of light output of the backlight module and increasing the brightness of the backlight module.

[0163] Please refer to Figure 29, which is a schematic diagram of another backlight module provided in an embodiment of this disclosure. The backlight module further includes:

[0164] The light-diffusing film 7 is located on the side of the color-switching layer 4 away from the transparent substrate 1.

[0165] By setting a light-diffusing film 7 on the side of the color transfer layer 4 away from the transparent substrate 1, the uniformity of light output of the backlight module can be further improved.

[0166] Based on the same inventive concept, this disclosure provides a method for manufacturing a backlight module. Please refer to Figure 30, which is a schematic diagram of the manufacturing process of a backlight module provided in this disclosure. The manufacturing method includes:

[0167] S10: A transparent substrate 1 is provided; wherein the transparent substrate 1 includes a first surface 1a and a second surface 1b opposite to each other;

[0168] S11: A plurality of first grooves 1ac are formed on the first surface 1a, and a plurality of second grooves 1bc are formed on the second surface 1b, each corresponding to one of the plurality of first grooves 1ac; wherein the orthographic projection of the second groove 1bc on the first surface 1a is located within the corresponding first groove 1ac.

[0169] S12: In the transparent substrate 1, a light-shielding structure 3 is formed on the side of the first groove 1ac away from the first surface 1a; the light-shielding structure 3 includes a first sub-light-shielding structure 313, which is housed in the second groove 1bc.

[0170] S13: Bond multiple light-emitting devices 2 to multiple first grooves 1ac respectively, so that the light-emitting devices 2 are housed in the first grooves 1ac; wherein the light-emitting surface 2a of the light-emitting device 2 faces the second surface 1b.

[0171] Please refer to Figure 31, which is a schematic diagram of the fabrication of forming a first groove and a second groove according to an embodiment of this disclosure.

[0172] If the transparent substrate 1 is a glass substrate or a resin substrate, the formation of a plurality of first grooves 1ac on the first surface 1a and a plurality of second grooves 1bc corresponding one-to-one with the plurality of first grooves 1ac on the second surface 1b can be achieved in the following manner:

[0173] S21: A first mask is formed on the first surface 1a, and a second mask is formed on the second surface 1b;

[0174] S211: Deposit hydrofluoric acid resistant material layers y on both sides of the transparent substrate 1; the material of the hydrofluoric acid resistant material layer y is a hydrofluoric acid resistant material, such as molybdenum (Mo).

[0175] S212: Pattern the hydrofluoric acid resistant material layer y on both sides of the transparent substrate 1 to obtain the first mask and the second mask.

[0176] S22: The transparent substrate 1 having a first mask and a second mask is etched to obtain a plurality of first grooves 1ac and a plurality of second grooves 1bc. Then the first mask and the second mask are removed.

[0177] The etching depth h' of the first groove 1ac and the second groove 1bc ranges from 1um to 400um, and is preferably from 50um to 100um.

[0178] In the embodiments provided in this disclosure, by setting a first mask and a second mask on both sides of the transparent substrate 1 respectively, and etching the transparent substrate 1 with the first mask and the second mask, a first groove 1ac and a second groove 1bc with the same depth can be quickly formed. The process is simple and easy to implement.

[0179] A transparent substrate 1 with the first mask and the second mask is placed in a hydrofluoric acid solution for etching to obtain a first groove 1ac and a second groove 1bc of the same depth.

[0180] In some embodiments, etching a transparent substrate 1 having a first mask and a second mask to obtain a plurality of first grooves 1ac and a plurality of second grooves 1bc can also be achieved in the following ways:

[0181] A transparent substrate 1 with a first mask and a second mask is placed in a hydrofluoric acid solution for a first etching to obtain a first groove 1ac and a second groove 1bc of the same depth.

[0182] After the transparent substrate 1 is placed back into the hydrofluoric acid solution, the second groove 1bc is etched a second time to obtain a second groove 1bc with a depth greater than that of the first groove 1ac.

[0183] For example, after performing S22, if a portion of the transparent substrate 1 (the side where the second groove 1bc is located) is placed in a hydrofluoric acid solution and the second groove 1bc is etched a second time, a second groove 1bc with a depth greater than the first groove 1ac can be obtained; or after depositing a layer of hydrofluoric acid resistant material on the surface of the first groove 1ac, the transparent substrate 1 with the second groove 1bc is placed in a hydrofluoric acid solution and then etched a second time to obtain a second groove 1bc with a depth greater than the first groove 1ac.

[0184] As shown in Figures 6-8, the transparent substrate 1 includes a substrate layer 11 and at least one nanoimprint adhesive layer 12, with the nanoimprint adhesive layer 12 located on one side of the substrate layer 11.

[0185] The formation of a plurality of first grooves 1ac on the first surface 1a and a plurality of second grooves 1bc corresponding one-to-one with the plurality of first grooves 1ac on the second surface 1b can be achieved in the following manner:

[0186] Nanoimprinting is performed on one side of the nanoimprint adhesive layer 12 to obtain a plurality of first grooves 1ac or a plurality of second grooves 1bc located in the nanoimprint adhesive layer.

[0187] When forming the transparent substrate 1 shown in Figure 6, the first groove 1ac in Figure 6 can be formed in the same way as the first groove 1ac in Figure 31. The nano-adhesive imprinting layer is imprinted on the second surface 1b using nanoimprinting technology to form the second groove 1bc.

[0188] When forming the transparent substrate 1 shown in Figure 7, the second groove 1bc in Figure 7 can be formed by referring to the method of forming the second groove 1bc in Figure 31. The nano-adhesive imprinting layer is imprinted on the first surface 1a using nanoimprinting technology to form the first groove 1ac.

[0189] When forming the transparent substrate 1 shown in Figure 8, nanoimprinting technology is used to imprint the nano-adhesive imprinting layers on the first surface 1a and the second surface 1b respectively to form the first groove 1ac and the second groove 1bc.

[0190] In the embodiments provided in this disclosure, by forming a nano-adhesive imprinting layer on at least one side of the substrate layer 11 of the transparent substrate 1, and imprinting the nano-imprinting adhesive layer 12 with nanoimprinting technology to obtain at least one of the first groove 1ac and the second groove 1bc, the manufacturing accuracy and manufacturing speed of the first groove 1ac and the second groove 1bc can be improved.

[0191] Based on the same inventive concept, embodiments of this disclosure also provide a display device, including the backlight module shown above.

[0192] The display device can be a liquid crystal display, liquid crystal screen, liquid crystal television, or other display devices, or a mobile device such as a mobile phone, tablet computer, or laptop.

[0193] Although preferred embodiments of this disclosure 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 the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.

[0194] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include such modifications and variations.

Claims

1. A backlight module, wherein, include: Transparent substrate; The transparent substrate includes a first surface and a second surface opposite to each other. The first surface has a plurality of first grooves, and the second surface has a plurality of second grooves that correspond one-to-one with the plurality of first grooves. The orthographic projection of the second groove on the first surface is located within the orthographic projection of the corresponding first groove on the first surface. Multiple light-emitting devices are housed within the first groove; wherein the light-emitting surface of each light-emitting device faces the second surface. A light-shielding structure is located on the side of the first groove away from the first surface; the light-shielding structure includes a first sub-light-shielding structure, which is housed within the second groove.

2. The backlight module as described in claim 1, wherein, The first sub-shading structure has a slit that extends through the thickness of the first sub-shading structure, and the slit divides the first sub-shading structure into multiple parts of the same shape.

3. The backlight module as described in claim 2, wherein, The gap includes multiple sub-gaps; The plurality of sub-slits are connected in the central region of the first sub-reflective structure.

4. The backlight module as described in claim 2, wherein, The second surface is divided into a plurality of consecutive unit areas, and the orthographic projection of each portion onto the second surface lies within one of the unit areas; The light-shielding structure also includes: Multiple second sub-shading structures are located on the second surface, and each of the multiple unit areas surrounding the first sub-shading structure contains one second sub-shading structure; the overlapping area between the portion and the corresponding unit area is greater than the overlapping area between the second sub-shading structure and the corresponding unit area; In the multiple unit areas between two adjacent first sub-shading structures, the overlapping area of ​​the second sub-shading structure and the corresponding unit area gradually decreases from both ends toward the center line, and the spacing between two adjacent second sub-shading structures gradually increases from both ends toward the center; the two ends are two adjacent first sub-shading structures, and the center is the center of the line connecting the two ends.

5. The backlight module as described in claim 4, wherein, The shape of the second sub-shading structure is the same as the shape of the portion projected onto the second surface.

6. The backlight module as described in any one of claims 1-5, wherein, The transparent substrate includes: Substrate layer; At least one nanoimprint adhesive layer is located on one side of the substrate layer; at least one of the first groove and the second groove is located on the nanoimprint adhesive layer.

7. The backlight module as described in claim 6, wherein, The substrate layer and the nanoimprint adhesive layer have the same refractive index.

8. The backlight module as described in any one of claims 1-5, wherein, The backlight module also includes: The color transfer layer is located on the side of the light-shielding structure away from the transparent substrate, or on the light-emitting surface.

9. The backlight module as described in any one of claims 1-5, wherein, The backlight module also includes: The reflective structure is located on the side of the transparent substrate away from the first sub-shielding structure.

10. The backlight module according to any one of claims 1-5, wherein, The bottom surface of the first groove is a plane; the side surface of the first groove is an arc surface.

11. The backlight module as described in claim 10, wherein, The bottom surface is rectangular in shape, and the longer side of the rectangle is greater than the length of the light-emitting device.

12. The backlight module as described in any one of claims 1-5, wherein, The shape of the first groove includes: Semi-ellipsoidal surface.

13. The backlight module as described in any one of claims 1-5, wherein, The second groove is shaped like a hemispherical surface or a conical surface.

14. The backlight module as described in any one of claims 1-5, wherein, The luminous flux emitted by the light-emitting device is distributed in the form of 1 / cosθ, where θ is the emission angle of the light-emitting device; the light emitted by the light-emitting device is projected onto the second surface to form the illumination area of ​​the light-emitting device; The illumination areas of two adjacent light-emitting devices are mutually tangent or intersecting.

15. The backlight module as described in claim 14, wherein, The illumination areas of two adjacent light-emitting devices intersect; The center line connecting any four adjacent light-emitting devices forms a square, and the intersection of the illumination areas of the four light-emitting devices is the center of the square. Alternatively, the center line connecting any three adjacent light-emitting devices can form an equilateral triangle, and the intersection of the illumination areas of the three light-emitting devices is the center of the equilateral triangle.

16. A method for manufacturing a backlight module, wherein, include: A transparent substrate is provided; wherein the transparent substrate includes opposing first and second surfaces; A plurality of first grooves are formed on the first surface, and a plurality of second grooves corresponding one-to-one with the plurality of first grooves are formed on the second surface; wherein the orthographic projection of the second groove on the first surface is located within the corresponding first groove; In the transparent substrate, a light-shielding structure is formed on the side of the first groove away from the first surface; the light-shielding structure includes a first sub-light-shielding structure, which is accommodated within the second groove; Multiple light-emitting devices are bonded to the multiple first grooves respectively, so that the light-emitting devices are housed in the first grooves; wherein the light-emitting surface of the light-emitting device faces the second surface.

17. The manufacturing method as described in claim 16, wherein, The method includes forming a plurality of first grooves on the first surface and forming a plurality of second grooves on the second surface that correspond one-to-one with the plurality of first grooves, comprising: A first mask is formed on the first surface, and a second mask is formed on the second surface; The transparent substrate having the first mask and the second mask is etched to obtain the plurality of first grooves and the plurality of second grooves.

18. The manufacturing method as described in claim 17, wherein, Etching a transparent substrate having a first mask and a second mask to obtain the plurality of first grooves and the plurality of second grooves includes: A transparent substrate with the first mask and the second mask is placed in a hydrofluoric acid solution for a first etching to obtain the first groove and the second groove with the same depth; After the transparent substrate with the second groove is placed back into the hydrofluoric acid solution, the second groove is etched a second time to obtain a second groove with a depth greater than that of the first groove.

19. The manufacturing method according to any one of claims 16-18, wherein, The transparent substrate includes a substrate layer and at least one nanoimprint adhesive layer, wherein the nanoimprint adhesive layer is located on one side of the substrate layer; The method includes forming a plurality of first grooves on the first surface and forming a plurality of second grooves on the second surface that correspond one-to-one with the plurality of first grooves, comprising: Nanoimprinting is performed on one side having the nanoimprint adhesive layer to obtain the plurality of first grooves or the plurality of second grooves located in the nanoimprint adhesive layer.

20. A display device, wherein, Includes the backlight module as described in any one of claims 1-15.

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