Light-emitting module, preparation method thereof and display device

Abstract

The embodiment of the application discloses a light-emitting module, comprising: a light-emitting film piece and a light-emitting unit; the light-emitting film piece comprises a microstructure layer, a substrate layer and a grating layer which are sequentially stacked; the microstructure layer and the grating layer are arranged on two surfaces of the substrate layer respectively. Therefore, by using the scheme provided by the embodiment of the application, the light emitted by the light-emitting unit can be converged by arranging the microstructure layer on one surface of the substrate layer, thereby reducing the loss of light source energy and improving the utilization rate of light energy; the grating layer is arranged on the other surface of the substrate layer opposite to the microstructure layer, the light converged by the microstructure layer is vertically emitted, the grating layer can make the light concentratedly directly emitted from the grating space, the utilization rate of light energy can be effectively improved, and the light energy is more concentrated, thereby being beneficial to imaging.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a light-emitting module, its preparation method, and a display device. Background Technology

[0002] Mini LED and micro LED displays are characterized by long lifespan, high integration, and self-illumination, and are used in 3D printing technology.

[0003] In common direct-lit displays, the viewing angle of Mini LED or Micro LED light sources is relatively wide, which leads to a greater loss of light source energy. Summary of the Invention

[0004] In view of this, embodiments of this application provide a light-emitting module and its preparation method, as well as a display device, for converging the light emitted by the light source and reducing the loss of light source energy.

[0005] A first aspect of this application provides a light-emitting module, including: a light-emitting film and a light-emitting unit; the light-emitting film includes a microstructure layer, a substrate layer, and a grating layer stacked sequentially.

[0006] The substrate layer has two opposing surfaces;

[0007] The microstructure layer is disposed on the surface of the substrate layer. The microstructure layer includes multiple microstructures. The microstructures are used to converge the light emitted by the light-emitting unit and transmit the converged light through the substrate layer to the grating layer. The microstructure layer is a structure protruding from the surface of the substrate layer. The light-emitting unit includes multiple light sources.

[0008] The grating layer is disposed on another surface of the substrate layer opposite to the microstructure layer, and the grating layer is used to emit the converged light perpendicularly.

[0009] Optionally, the substrate layer includes at least one of the following: a glass layer, an acrylic glass layer, and a polyester film layer.

[0010] Optionally, the grating layer is disposed on the side of the substrate layer away from the light source.

[0011] Optionally, the microstructure layer and the substrate layer are an integral structure.

[0012] Optionally, the plurality of microstructures are periodically arranged on the surface of the substrate layer.

[0013] Optionally, the plurality of microstructures are closely arranged on the surface of the substrate layer, or,

[0014] The plurality of microstructures are arranged at equal intervals on the surface of the substrate layer, or,

[0015] The multiple microstructures are periodically grouped and arranged on the surface of the substrate layer.

[0016] Optionally, the light-emitting unit is a plurality of uniformly distributed light sources;

[0017] The microstructures correspond one-to-one with the light source.

[0018] Optionally, there is a gap between two adjacent microstructures in the microstructure layer, and each microstructure has a sidewall, wherein the sidewall of the microstructure is the surface of the gap formed by the two adjacent microstructures.

[0019] Optionally, the microstructure is a trapezoidal microstructure.

[0020] Optionally, there is a gap between the hypotenuses of adjacent trapezoidal microstructures in the microstructure layer, and the gap overlaps with the light source in the vertical direction, or...

[0021] The trapezoidal microstructure and the light source overlap in the vertical direction.

[0022] Optionally, the microstructure is a microstructure with a triangular cross-sectional shape.

[0023] Optionally, there is a gap between the hypotenuses of adjacent triangular microstructures in the microstructure layer, and the gap overlaps with the light source in the vertical direction.

[0024] Optionally, the microstructure is a microstructure with an arc-shaped cross-section.

[0025] Optionally, the arc-shaped microstructures in the microstructure layer overlap with the light source in the vertical direction.

[0026] Optionally, the width of the microstructure is 1 to 10 micrometers; the height of the microstructure is 10 to 500 micrometers; and the ratio of the height to the width is 10:1 to 100:1.

[0027] Optionally, when the size of the light source is greater than a preset threshold, the microstructure is an arc-shaped structure; when the size of the light source is less than the preset threshold, the microstructure is a trapezoidal microstructure, a triangular microstructure, or an arc-shaped microstructure.

[0028] Optionally, the height of the microstructure can be calculated using the Gaussian imaging formula.

[0029] Optionally, the width of the microstructure is greater than the minimum spacing of the light sources, wherein the minimum spacing of the light sources is the sum of the width of the light sources and a preset interval value.

[0030] The first aspect of this application provides a method for preparing a light-emitting module, including:

[0031] A substrate layer is provided, the substrate layer having two opposing surfaces;

[0032] A microstructure layer is disposed on the surface of the substrate layer, wherein the microstructure layer includes a plurality of microstructures, the microstructures being used to converge the light emitted by the light source and transmit the converged light through the substrate layer to the grating layer.

[0033] A grating layer is disposed on the other surface of the substrate layer opposite the microstructure layer, wherein the grating layer is used to emit the converged light perpendicularly.

[0034] Optionally, the provision of a microstructure layer on the surface of the substrate layer includes:

[0035] The surface of the substrate layer is cut to obtain the microstructure layer, or...

[0036] The microstructure layer was obtained by 3D printing using axial photolithography.

[0037] Optionally, the provision of a grating layer on the other surface of the substrate layer opposite the microstructure layer includes:

[0038] The grating layer is fabricated on the other surface of the substrate layer opposite the microstructure layer using methods such as vapor deposition, etching, or film application.

[0039] Optionally, it includes the light-emitting module and driving circuit as described above; the light-emitting module includes an optical film and a light-emitting unit;

[0040] The optical film is located above the light-emitting unit;

[0041] The light-emitting unit is connected to the driving circuit.

[0042] The light-emitting module and its fabrication method, as well as the display device provided in this application embodiment, can converge the light emitted by the light-emitting unit by setting a microstructure layer on one surface of the substrate layer, thereby reducing the loss of light source energy and improving the utilization rate of light energy. By setting a gate layer on the other surface of the substrate layer opposite to the microstructure layer, the light converged by the microstructure layer is emitted vertically. The gate layer can make the light more concentrated and emitted directly from the grid space, which can effectively improve the utilization rate of light energy and make the light energy more concentrated, thus facilitating imaging. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0044] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0045] Figure 1 A top view of a light-emitting module;

[0046] Figure 2 This is a schematic diagram of the structure of an optical film;

[0047] Figure 3 This is a schematic diagram of the structure of a light-emitting unit;

[0048] Figure 4 for Figure 1 A cross-sectional view of a light-emitting module;

[0049] Figure 5 for Figure 1 Another cross-sectional view of the light-emitting module;

[0050] Figure 6 for Figure 1 Another cross-sectional view of the light-emitting module;

[0051] Figure 7 for Figure 1 Another cross-sectional view of the light-emitting module;

[0052] Figure 8 for Figure 1 Another cross-sectional view of the light-emitting module;

[0053] Figure 9 This is a schematic diagram of a 3D printing device provided in an embodiment of this application;

[0054] Figure 10 A flowchart illustrating a method for fabricating a light-emitting module provided in this application embodiment;

[0055] Figure 11 This is a schematic diagram illustrating the fabrication of a microstructure provided in an embodiment of this application. Detailed Implementation

[0056] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0057] Figure 1 The image shown is a top view of an optical film provided in an embodiment of the present invention. Figure 2 The diagram shown is a schematic representation of an optical film. Please refer to it. Figure 1 and Figure 2 The optical film provided in this embodiment of the invention includes a substrate layer 10, a microstructure layer 20, and a grating layer 30.

[0058] The substrate layer 10 has two opposing surfaces, namely an upper surface and a lower surface. The lower surface is the surface facing the light-emitting unit, and the upper surface is the surface opposite to the lower surface.

[0059] A microstructure layer 20 is disposed on the substrate layer facing the surface of the light-emitting unit. The structure includes multiple microstructures. The microstructures are used to converge the light emitted by the light-emitting unit, and then the converged light is transmitted through the substrate layer to the grating layer. The microstructure layer and the substrate layer are an integral structure. The microstructures are protrusions on the surface of the substrate layer. The microstructure layer reduces light energy loss by converging the light emitted by the light-emitting unit that is not emitted perpendicularly.

[0060] The grating layer 30 is disposed on another surface of the substrate layer opposite to the microstructure layer 20, and the converged light rays are emitted perpendicularly through the grating layer.

[0061] It should be noted that, Figure 2 The microstructure in this application is illustrated using only a trapezoidal microstructure as an example, and the actual shape of the microstructure is not limited. In some other embodiments of this application, the microstructure may also be an arc, a triangle, etc.

[0062] refer to Figure 3 , Figure 3 This is a schematic diagram of a light-emitting unit. In this embodiment, the plane of the light-emitting unit is parallel to the plane of the optical film. The light-emitting unit includes multiple light sources. Since light can be emitted in all directions from the light sources, the vertically emitted light can be emitted directly, while the light emitted from the surrounding areas is scattered in all directions, resulting in significant light energy loss.

[0063] It is understood that the optical film provided in this application embodiment can be applied to the light-emitting module. The optical film converges the divergent light emitted by the light source, thereby converging the light-emitting angle of the light source.

[0064] It should be noted that the size and distribution of the light sources in the accompanying drawings of the embodiments of this application are schematic and do not represent the actual size and distribution of the light sources.

[0065] Figure 4 As shown Figure 1 A cross-sectional view of a light-emitting module. In an optional embodiment of this application, the substrate layer is made of glass. In practical applications, since ultraviolet Mini LEDs are somewhat destructive, using glass as the substrate layer to prepare microstructures can not only improve the utilization rate of light energy, but also meet the lifespan requirements of the display module.

[0066] It should be noted that using glass as the substrate layer is a preferred material in the embodiments of this application. In some other embodiments of this application, the substrate layer may also be an acrylic layer, a polyester film layer, etc.

[0067] In the light-emitting module provided in this application embodiment, the grating layer is disposed on the side of the substrate layer away from the light source, so that the light after being converged by the microstructure can be emitted perpendicularly.

[0068] In one optional embodiment of this application, the microstructure layer is a raised microstructure on the surface of the substrate layer. This microstructure has a triangular cross-sectional shape, and multiple triangular microstructures are closely arranged on the surface of the substrate layer without any gaps between them. A gap exists between adjacent triangular microstructures in the microstructure layer, and each triangular microstructure has a sidewall. The sidewall of the triangular microstructure is the surface of the triangular microstructure forming the gap between two adjacent triangular microstructures. A gap exists between the hypotenuses of adjacent triangular microstructures in the microstructure layer. The gap and the light source overlap vertically. Each gap formed by a microstructure corresponds one-to-one with the light source. The diverging light emitted by the light source converges through the sidewalls of the gaps between the triangular microstructures and reaches the grating layer.

[0069] It should be noted that, Figure 4 The microstructure arrangement in this application is illustrated by taking the example of closely arranged triangular microstructures on the surface of the substrate layer. It does not limit the actual arrangement of the microstructures. In some other embodiments of this application, the triangular microstructures may also be arranged at equal intervals.

[0070] Figure 5 As shown Figure 1Another cross-sectional view of the light-emitting module. In an optional embodiment of this application, the microstructure layer is a microstructure protruding from the surface of the substrate layer. This microstructure has a trapezoidal cross-sectional shape, and multiple trapezoidal microstructures are arranged at equal intervals on the surface of the substrate layer. There is a gap between two adjacent trapezoidal microstructures in the microstructure layer, and each trapezoidal microstructure has a sidewall. The sidewall of the trapezoidal microstructure is the surface of the trapezoidal microstructure that forms the gap between two adjacent trapezoidal microstructures. Each gap formed by the microstructure corresponds one-to-one with the light source. The vertical light emitted by the light source reaches the grating layer through a plane parallel to the light source substrate layer, and the divergent light emitted by the light source converges through the sidewall of the trapezoidal microstructure before reaching the grating layer.

[0071] It should be noted that, Figure 5 The illustration of the microstructure arrangement in this application is based solely on the example of trapezoidal microstructures arranged at equal intervals on the surface of the substrate layer. It does not limit the actual arrangement of the microstructures. In some other embodiments of this application, the trapezoidal microstructures may also be arranged in periodic groups, etc.

[0072] Figure 6 As shown Figure 1 Another cross-sectional view of the light-emitting module. In an optional embodiment of this application, the microstructure layer is a convex microstructure on the surface of the substrate layer. The microstructure is a microstructure with an arc-shaped cross-section. Multiple arc-shaped microstructures are arranged in periodic groups on the surface of the substrate layer. Among them, three arc-shaped microstructures form an arc-shaped microstructure group, and one arc-shaped microstructure group corresponds to one light source. The arc-shaped microstructure group in the microstructure layer overlaps with the light source in the vertical direction. The light emitted by the light source converges through the surface of the arc-shaped microstructure and reaches the grating group.

[0073] It should be noted that, Figure 6 The illustration of the microstructure arrangement in this application is based solely on the example of periodically grouped arc-shaped microstructures on the substrate surface. It does not limit the actual arrangement of the microstructures. In other embodiments of this application, the arc-shaped microstructures can also be manifested as follows: Figure 7 The diagram shows an evenly spaced arrangement, where each arc-shaped microstructure corresponds to a light source. This application does not limit the number of arc-shaped microstructures in a group; the group may include two or four arc-shaped microstructures, depending on actual needs.

[0074] In one alternative embodiment of this application, such as Figure 7 In the illustrated light-emitting module, the light-emitting film is supported on both sides of the light-emitting unit by two pillars integral with the substrate layer. It should be noted that... Figure 7The support method of the optical film in this application embodiment is illustrated by taking the support on both sides of the light-emitting unit as an example. Alternatively, the optical film can be supported on both sides of each light source of the light-emitting unit to form multiple pillars.

[0075] In this embodiment, the optical film is supported on the light-emitting unit by a pillar, the microstructure layer is located above the light-emitting unit and parallel to the light-emitting unit; the light-emitting unit is connected to the driving circuit; the light-emitting unit is located between the driving circuit and the optical film.

[0076] Figure 8 As shown Figure 1 Another cross-sectional view of the light-emitting module. In an optional embodiment of this application, the microstructure layer is a trapezoidal microstructure protruding from the surface of the substrate layer. Two adjacent trapezoidal microstructures are closely connected together to form a gap with a triangular cross-sectional shape. The light source and the trapezoidal microstructure overlap in the vertical direction. The light emitted vertically from the light source is transmitted to the grating layer through the trapezoidal microstructure parallel to the light-emitting unit. The light emitted divergently from the light source is converged through the triangular gap on both sides of the trapezoidal microstructure and then transmitted to the grating layer, thereby effectively improving the utilization rate of light energy and making the light energy more concentrated.

[0077] In the embodiments of this application, the microstructure of the microstructure layer is designed with reference to a high depth-to-width ratio structure. A high depth-to-width ratio structure refers to a microstructure with a width of 1 to 10 micrometers and a height (depth) of approximately 10 to 500 micrometers, with a depth-to-width ratio between 10:1 and 100:1, and the structure is characterized by narrow gaps and sidewalls.

[0078] In this embodiment, when the size of the light source is larger than a preset threshold, the microstructure is an arc-shaped structure; when the size of the light source is smaller than the preset threshold, the microstructure is a trapezoidal microstructure, a triangular microstructure, or an arc-shaped microstructure. For example, the light source is a Mini LED, and Mini LEDs have sizes such as 0305 (76 μm × 127 μm), 0406 (100 μm × 150 μm), 0509 (5 mil × 9 mil), 0602 (6 mil × mil), 1212 (12 mil × 12 mil), and 1028 (10 mil × 28 mil). For smaller light sources such as 0602, 0406, and 0305, the microstructure is chosen to be arc-shaped, triangular, or trapezoidal because the light source size is small, and any shape of microstructure can meet the light convergence requirement. For larger light sources such as 1020 and 1028, an arc-shaped microstructure is chosen because when the light source is larger, better optical effects can be achieved through refraction via an arc.

[0079] In this embodiment, the height of the microstructure is calculated according to the Gaussian imaging formula, as follows:

[0080]

[0081]

[0082] Where f is the focal length; v is the image distance, which is the sum of the height of the microstructure and the thickness of the substrate layer; u is the object distance, which is the distance between the light-emitting unit and the microstructure; n2 is the refractive index of the material of the microstructure; and r is the height of the microstructure.

[0083] In this embodiment of the application, the width of the structure is greater than the minimum spacing of the light sources, wherein the minimum spacing of the light sources is the sum of the width of the light sources and a preset interval value.

[0084] Since the light source emits light from all sides, the width of the microstructure can be adjusted according to the size of the light source. For example, for a Mini LED with a size of 0305 (76 μm × 127 μm), the distance between two microstructures is greater than the minimum spacing between two Mini LEDs (127 + 100) μm. If the spacing between two Mini LEDs is too small, it will increase the probability of process defects. The preset interval value in the minimum spacing can be adjusted according to different sizes of Mini LEDs, but it cannot be less than 100 μm.

[0085] The light-emitting module in this embodiment can be applied to, for example... Figure 9 In the ultraviolet Mini LED display of the 3D printing equipment shown, the ultraviolet light emitted by the light-emitting unit is converged, thereby reducing the loss of light source energy and effectively improving the utilization rate of ultraviolet light in the 3D printing equipment. The light, converged by the microstructure layer, is emitted vertically, and the gate layer allows the light to be concentrated and emitted directly from the grid space, effectively improving the utilization rate of light energy and making the light energy more concentrated, thus accelerating the 3D forming speed and achieving better 3D forming results. The liquid crystal display (LCD) used in the 3D printing equipment has a short lifespan, and ultraviolet light damages the liquid crystal and the film material of the light source BL of the LCD display, accelerating the aging of these materials after ultraviolet irradiation. In this embodiment, an optical film made of glass is used in the 3D printing equipment, which can effectively extend the lifespan of the display.

[0086] See Figure 10 The figure is a schematic flowchart of a method for preparing a light-emitting module provided in an embodiment of this application, which can be achieved through the following steps S101-S102.

[0087] S101: A grating layer is formed on the surface of the substrate layer.

[0088] The grating layer is used to concentrate the converged light rays and direct them out of the grating space, thereby effectively improving the utilization rate of light energy.

[0089] Specifically, a grating is made by etching a large number of parallel grooves on the glass surface. The grooves are opaque, while the smooth part between two grooves is transparent, which is equivalent to a slit.

[0090] In the embodiments of this application, a grating layer can be fabricated on the other surface of the substrate layer opposite the microstructure layer by means of vapor deposition, etching, or film application.

[0091] Specifically, a thin film is deposited on the surface of the substrate layer, and the unwanted film is removed by etching to obtain the grating. It should be noted that the grating fabrication method in the embodiments of this application is only exemplified by etching, and does not limit the actual fabrication method of the grating. In some other embodiments of this application, the grating can also be fabricated by vapor deposition, film lamination, etc.

[0092] In this embodiment, the height of the grating is determined by the manufacturing process. When fabricated using vapor deposition or etching, the grating height is approximately 0.1 micrometers; when fabricated using film deposition, the minimum grating height is 0.05 micrometers. It should be noted that this embodiment does not limit the grating height; the specific height of the grating is determined based on actual requirements and the specific manufacturing process.

[0093] S102: A microstructure layer is disposed on the other surface of the substrate layer opposite the grating layer.

[0094] A substrate layer is provided, and a microstructure layer includes multiple microstructures. The microstructures are used to converge the light emitted by the light source and transmit the converged light through the substrate layer to the grating layer.

[0095] It is understood that the microstructures provided in the embodiments of this application are fabricated on the surface of a substrate layer using a process. The microstructure layer and the substrate layer are an integral structure, employing methods such as... Figure 11 The cutting equipment shown cuts the surface of the substrate layer to obtain a microstructure layer. For example, for 0.7 mm thick glass, the cutting serrations of the equipment have a height between 250 and 300 micrometers and a spacing between 500 and 600 micrometers. The resulting microstructure can meet the light convergence requirements of Mini LEDs.

[0096] It should be noted that, Figure 10The microstructure fabrication method in this application is illustrated using conventional cutting equipment as an example only, and is not limited to the actual fabrication method. In some other embodiments of this application, the microstructure is also fabricated using 3D printing technology with computed axial lithography (CAL). This application does not limit the actual fabrication method of the microstructure; the fabrication can employ existing methods or other self-designed methods, and is not specifically limited here.

[0097] It should be noted that steps S101 and S102 are not necessarily related, so step S102 is not necessarily executed after step S101. The execution order of this application is only one of the optional methods.

[0098] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0099] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the method described above can be referred to the corresponding process in the foregoing device embodiments, and will not be repeated here.

[0100] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical business division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0101] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention.

[0102] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A light-emitting module, characterized in that, include: A light-emitting film and a light-emitting unit; the light-emitting film comprises a microstructure layer, a substrate layer, and a grating layer stacked sequentially. The substrate layer has two opposing surfaces; The microstructure layer is disposed on the surface of the substrate layer. The microstructure layer includes multiple microstructures. The microstructures are used to converge the light emitted by the light-emitting unit and transmit the converged light through the substrate layer to the grating layer. The microstructure layer is a structure protruding from the surface of the substrate layer. The light-emitting unit includes multiple light sources. The grating layer is disposed on another surface of the substrate layer opposite to the microstructure layer, and the grating layer is used to emit the converged light perpendicularly. There is a gap between two adjacent microstructures in the microstructure layer, and each microstructure has a sidewall, the sidewall of which is the surface of the gap formed by two adjacent microstructures; the cross-sectional shape of the microstructure is trapezoidal, triangular or arc-shaped.

2. The light-emitting module according to claim 1, characterized in that, The substrate layer includes at least one of the following: a glass layer and a polyester film layer.

3. The light-emitting module according to claim 1, characterized in that, The grating layer is disposed on the side of the substrate layer away from the light source.

4. The light-emitting module according to claim 1, characterized in that, The microstructure layer and the substrate layer are an integral structure.

5. The light-emitting module according to claim 1, characterized in that, The multiple microstructures are periodically arranged on the surface of the substrate layer.

6. The light-emitting module according to claim 5, characterized in that, The multiple microstructures are closely arranged on the surface of the substrate layer, or, The plurality of microstructures are arranged at equal intervals on the surface of the substrate layer, or, The multiple microstructures are periodically grouped and arranged on the surface of the substrate layer.

7. The light-emitting module according to claim 1, characterized in that: The light-emitting unit is a plurality of light sources that are evenly distributed; The microstructures correspond one-to-one with the light source.

8. The light-emitting module according to claim 1, characterized in that, There are gaps between the hypotenuses of adjacent trapezoidal microstructures in the microstructure layer, and these gaps overlap with the light source in the vertical direction, or... The trapezoidal microstructure and the light source overlap in the vertical direction.

9. The light-emitting module according to claim 1, characterized in that, There are gaps between the hypotenuses of adjacent triangular microstructures in the microstructure layer, and the gaps overlap with the light source in the vertical direction.

10. The light-emitting module according to claim 1, characterized in that, The arc-shaped microstructure in the microstructure layer overlaps with the light source in the vertical direction.

11. The light-emitting module according to claim 1, characterized in that, The width of the microstructure is 1 to 10 micrometers; the height of the microstructure is 10 to 500 micrometers; and the ratio of the height to the width is 10:1 to 100:

1.

12. The light-emitting module according to claim 1, characterized in that, When the size of the light source is greater than a preset threshold, the microstructure is an arc-shaped structure; when the size of the light source is less than the preset threshold, the microstructure is a trapezoidal microstructure, a triangular microstructure, or an arc-shaped microstructure.

13. The light-emitting module according to claim 1, characterized in that, The height of the microstructure was calculated using the Gaussian imaging formula.

14. The light-emitting module according to claim 1, characterized in that, The width of the microstructure is greater than the minimum spacing of the light sources, wherein the minimum spacing of the light sources is the sum of the width of the light sources and a preset interval value.

15. A method for preparing a light-emitting module, characterized in that, include: A substrate layer is provided, the substrate layer having two opposing surfaces; A microstructure layer is disposed on the surface of the substrate layer, wherein the microstructure layer includes a plurality of microstructures, the microstructures being used to converge the light emitted by the light source and transmit the converged light through the substrate layer to the grating layer; there is a gap between two adjacent microstructures in the microstructure layer, and each microstructure has a sidewall, the sidewall of the microstructure being the surface of the gap formed by two adjacent microstructures; the cross-sectional shape of the microstructure is trapezoidal, triangular, or arc-shaped. A grating layer is disposed on the other surface of the substrate layer opposite the microstructure layer, wherein the grating layer is used to emit the converged light perpendicularly.

16. The preparation method according to claim 15, characterized in that, The provision of a microstructure layer on the surface of the substrate layer includes: The surface of the substrate layer is cut to obtain the microstructure layer, or... The microstructure layer was obtained by 3D printing using axial photolithography.

17. The preparation method according to claim 15, characterized in that, The provision of a grating layer on the other surface of the substrate layer opposite the microstructure layer includes: The grating layer is fabricated on the other surface of the substrate layer opposite the microstructure layer using methods such as vapor deposition, etching, or film application.

18. A display device, characterized in that, Includes the light-emitting module and driving circuitry as described in any one of claims 1-14; the light-emitting module includes an optical film and a light-emitting unit; The optical film is located above the light-emitting unit; The light-emitting unit is connected to the driving circuit.

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