Light-emitting substrate and display device

Abstract

The application provides a light-emitting substrate and a display device. The light-emitting substrate comprises a light-transmitting substrate, a convex part, a first reflecting layer, a second reflecting layer and a light recycling part. The light-transmitting substrate comprises a first groove. The convex part is arranged in the first groove and is spaced apart from the side surface of the first groove. The first reflecting layer is arranged in the first groove and at least covers the side surface of the convex part, and at least part of the first groove is exposed. The second reflecting layer is arranged on the side of the light-transmitting substrate away from the second surface, and the second reflecting layer is provided with a first through hole. The light-emitting unit and the second reflecting layer are arranged on the same side of the light-transmitting substrate. The light recycling part is arranged on the side of the first reflecting layer close to the second surface, and is used for scattering or reflecting light rays irradiated onto the light recycling part. The orthographic projection of the light recycling part on the second surface and the orthographic projection of the first reflecting layer on the second surface at least partially do not overlap. The uniformity of light emission of the light-emitting substrate can be improved.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a light-emitting substrate and a display device. Background Technology

[0002] With the development of LED technology, light-emitting substrates using LEDs at the sub-millimeter (Mini) or even micrometer (Micro) scale have been widely applied. This allows products utilizing these substrates, such as liquid crystal displays (LCDs), to achieve screen contrast levels comparable to organic light-emitting diode (OLED) displays, while retaining the technological advantages of LCDs, thus enhancing display quality and providing users with a superior visual experience. Summary of the Invention

[0003] This application provides a light-emitting substrate, including:

[0004] A light-transmitting substrate includes opposing first and second surfaces, and the light-transmitting substrate has a first groove with an opening facing the first surface;

[0005] The protrusion is located within the first groove and is spaced apart from the side surface of the first groove; in the direction from the first surface to the second surface, the area of ​​the cross section of the protrusion parallel to the second surface gradually increases;

[0006] A first reflective layer is located within the first groove, at least covering the side surface of the protrusion, and exposing at least a portion of the first groove;

[0007] The second reflective layer is located on the side of the light-transmitting substrate away from the second surface. The second reflective layer is provided with a first through hole. The orthographic projection of the first through hole on the second surface overlaps with the orthographic projection of the first groove on the second surface.

[0008] The light-emitting unit and the second reflective layer are located on the same side of the light-transmitting substrate, and the light emitted by the light-emitting unit enters the first groove through the first through hole;

[0009] A light-recovery section is located on the side of the first reflective layer near the second surface, and is used to scatter or reflect light incident on the light-recovery section; the orthographic projection of the light-recovery section on the second surface does not overlap with the orthographic projection of the first reflective layer on the second surface at least partially, and the orthographic projection of the light-recovery section on the second surface does not overlap with the orthographic projection of the portion of the second reflective layer other than the first through-hole on the second surface at least partially.

[0010] In some embodiments, the light recovery section is provided with a second through hole, and the orthographic projection of the second through hole on the second surface of the light-transmitting substrate overlaps with the orthographic projection of the first through hole on the second surface of the light-transmitting substrate.

[0011] In some embodiments, the light-emitting unit includes a color conversion layer, the surface of the color conversion layer near the second surface being located within the first through hole; in the direction from the first surface to the second surface, the distance between one end of the side of the first through hole near the second surface and the light-recovering part is H; the distance between the outer contour of the orthographic projection of the first through hole on the second surface and the outer contour of the orthographic projection of the light-recovering part on the second surface is X, and the ratio of X to H is greater than 0.7.

[0012] In some embodiments, the light-emitting unit includes a color conversion layer located within the first groove. In the direction from the first surface to the second surface, the distance between the surface of the color conversion layer away from the second surface and the light-recovering part is H. The distance between the outer contour of the orthographic projection of the color conversion layer on the second surface and the outer contour of the orthographic projection of the light-recovering part on the second surface is X, and the ratio of X to H is greater than 0.7.

[0013] In some embodiments, the outer contour of the orthographic projection of the first reflective layer on the second surface falls within the orthographic projection of the light-recovering portion on the second surface.

[0014] In some embodiments, the outer contour of the orthographic projection of the first through hole on the second surface is located inside the outer contour of the orthographic projection of the first reflective layer on the second surface.

[0015] In some embodiments, the light-transmitting substrate and the protrusion are an integral structure;

[0016] Alternatively, the materials of the light-transmitting substrate and the protrusion may be different.

[0017] In some embodiments, the second surface has a second groove, and at least a portion of the light-recovery portion is located within the second groove;

[0018] Alternatively, the second surface is planar, and the light-recovering portion is located on the side of the second surface of the light-transmitting substrate away from the first surface.

[0019] In some embodiments, the light recovery unit includes a light-transmitting material and scattering particles distributed in the light-transmitting material;

[0020] Alternatively, the light recovery section may have a semi-transparent, semi-reflective structure;

[0021] Alternatively, the light-recovering section may be a reflective structure.

[0022] In some embodiments, the light-transmitting substrate has a plurality of spaced light-collecting structures on the side near the second reflective layer.

[0023] In some embodiments, the light-transmitting substrate includes a plurality of microstructures, wherein,

[0024] The light-collecting structure is a first protrusion, and the microstructure is a recessed structure, with each first protrusion located within a corresponding recessed structure; or...

[0025] The light-collecting structure is a recessed portion, and the microstructure is a second protrusion, with each recessed portion covering the corresponding second protrusion.

[0026] In some embodiments, the light-transmitting substrate includes a substrate body and an auxiliary layer located on the substrate body facing the second reflective layer, and the microstructure is disposed on the auxiliary layer.

[0027] This application also provides a display device, including the aforementioned light-emitting substrate and a display panel located on the side of the light-transmitting substrate away from the light-emitting unit.

[0028] The beneficial effects of this application include:

[0029] In this embodiment, a portion of the light emitted by the light-emitting unit enters the first groove of the light-transmitting substrate through the first through hole and is reflected by the first reflective layer before being incident on the surface of the second reflective layer and reflected. At least a portion of the light reflected by the second reflective layer is reflected multiple times between the second reflective layer and the second surface before exiting through the second surface of the light-transmitting substrate. This can improve the uniformity of the emitted light, and the light-emitting substrate may not have a uniform light film layer or may have a reduced number of uniform light film layers, which is beneficial to reducing the thickness of the light-emitting substrate.

[0030] In the light emitted by the light-emitting unit, a portion of the light is not reflected by the first reflective layer and passes through the area of ​​the first groove located around the first reflective layer to enter the second surface of the light-transmitting substrate. If this portion of light exits directly from the second surface of the light-transmitting substrate, it will cause excessively high local brightness of the light-emitting substrate, resulting in poor brightness uniformity of the second surface. In this embodiment, a light recovery unit is provided. The light recovery unit scatters or reflects at least a portion of the light that is not reflected by the first reflective layer. After being scattered, the light diverges in all directions, thus avoiding the problem of excessive brightness in some areas of the light-emitting substrate. After being reflected, the light enters the surface of the second reflective layer and is reflected. At least a portion of the light reflected by the second reflective layer undergoes multiple reflections between the second reflective layer and the second surface before exiting through the second surface of the light-transmitting substrate. This improves the uniformity of brightness of the light-emitting substrate and alleviates the problem of excessive brightness in some areas of the light-emitting substrate.

[0031] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0033] Figure 1 The image shown is a top view of a portion of the structure of the light-emitting substrate;

[0034] Figures 2 to 10 The illustration shown is an exemplary embodiment of this application. Figure 1 A side sectional view cut along section line AA.

[0035] Figures 11-22 The diagram shows the structural steps of a method for preparing a light-emitting substrate according to an exemplary embodiment of this application.

[0036] In the figure: 10-transparent substrate; 101-first surface; 102-second surface; 10a-first groove; 10b-second groove; 11-protrusion; 12-substrate body; 13-auxiliary layer; 131-microstructure; 1311-recessed structure; 1312-second protrusion; 20-first reflective layer; 30-second reflective layer; 30a-first through-hole; 31-light-collecting structure; 311-first protrusion; 312-recessed portion; 40-Light-emitting unit; 41-Light-emitting element; 411-Pin; 42-Color conversion layer; 50-Light recovery section; 50a-Second through-hole; 60-Filling layer; 70-Definition structure; 91-Conductive pad; 92-Insulating layer; 92'-Insulating thin film layer; 93-Third reflective layer; 94-Alignment structure; 95-Mask layer; 951-First mask section; 951a-Mask through-hole; 952-Second mask section; 12'-Substrate. Detailed Implementation

[0037] The present application will be described more fully below with reference to the accompanying drawings in which embodiments are illustrated.

[0038] It should be noted that when element A, such as a layer, film, or region, is referred to as "on the side of element B away from element C," it means that element A can be directly on the surface of element B on the side away from element C, or that an intermediate layer, intermediate region, or intermediate element may exist between element B and element A. When element A, such as a layer, film, or region, is referred to as "between element B and element C," it means that only element A exists between element B and element C, or that an intermediate layer, intermediate region, or intermediate element may exist between element A and element B, or between element A and element C.

[0039] While terms such as "first," "second," etc., can be used to describe various components, such components are not limited by these terms. These terms are only used to distinguish one component from another and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more. Where there is no conflict, the features in the embodiments described below in this application may complement or combine with each other.

[0040] In the accompanying drawings, the symbols "x", "y", and "z" are used to indicate directions. The x, y, and z directions are not limited to three mutually perpendicular directions in a Cartesian coordinate system and can be interpreted in a broader sense. For example, the x, y, and z directions can be perpendicular to each other, or they can represent different directions that are not perpendicular to each other. Exemplarily, x indicates a first direction, y indicates a second direction perpendicular to the first direction, and z indicates a third direction perpendicular to both the first and second directions. The first direction x, the second direction y, and the third direction z can correspond to the horizontal direction, vertical direction, and thickness direction of the light-emitting substrate, respectively.

[0041] In the accompanying drawings, the dimensions and thicknesses of the elements may be enlarged for better understanding, clarity, and ease of description. However, this application is not limited to the dimensions and thicknesses shown in the drawings. The thicknesses of layers, films, panels, areas, and other elements may be exaggerated in the drawings for clarity. Example embodiments are shown in the drawings, wherein the same reference numerals denote the same elements.

[0042] like Figure 1 and Figure 2 As shown, where, Figure 1 The image shown is a top view of a portion of the structure of the light-emitting substrate. Figure 2 As shown Figure 1A side sectional view taken along section line AA. The light-emitting substrate includes a light-transmitting substrate 10, a protrusion 11, a first reflective layer 20, a second reflective layer 30, a light-emitting unit 40, and a light-receiving unit 50. The light-transmitting substrate 10 includes a first surface 101 and a second surface 102 facing each other, and has a first groove 10a with an opening facing the first surface 101. The protrusion 11 is located within the first groove 10a and is spaced apart from the side surface of the first groove 10a. In the direction from the first surface 101 to the second surface 102, the area of ​​the cross-section of the protrusion 11 parallel to the second surface 102 gradually increases. The first reflective layer 20 is located within the first groove 10a, at least covering the side surface of the protrusion 11, and exposing at least a portion of the first groove 10a. The second reflective layer 30 is located on the side of the light-transmitting substrate 10 away from the second surface 102, and has a first through-hole 30a on the second surface 102 of the light-transmitting substrate 10. The orthographic projection of the first reflective layer 20 on the second surface 102 of the light-transmitting substrate 10 overlaps with the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10; the light-emitting unit 40 and the second reflective layer 30 are located on the same side of the light-transmitting substrate 10, and the light emitted by the light-emitting unit 40 enters the first groove 10a through the first through hole 30a; the light-recovering part 50 is located on the side of the first reflective layer 20 near the second surface 102, and is used to scatter or reflect the light irradiated onto the light-recovering part 50; the orthographic projection of the light-recovering part 50 on the second surface 102 does not overlap with the orthographic projection of the first reflective layer 20 on the second surface 102 at least partially, and the orthographic projection of the part of the second reflective layer 30 other than the first through hole 30a on the second surface 102 does not overlap with the orthographic projection of the second reflective layer 30 on the second surface 102 at least partially.

[0043] In this embodiment, among the light emitted by the light-emitting unit 40 that enters the first groove 10a of the light-transmitting substrate 10 through the first through hole 30a, a portion of the light is reflected by the first reflective layer 20 and then incident on the surface of the second reflective layer 30 and is reflected. At least a portion of the light reflected by the second reflective layer 30 undergoes multiple reflections between the second reflective layer 30 and the second surface 102 before exiting through the second surface 102 of the light-transmitting substrate 10. This can improve the uniformity of the emitted light, and the light-emitting substrate may not have a uniform light film layer or may have a reduced number of uniform light film layers, which is beneficial to reducing the thickness of the light-emitting substrate.

[0044] Of the light emitted by the light-emitting unit, a portion is not reflected by the first reflective layer 20 and passes through the area of ​​the first groove 10a located around the first reflective layer 20 before entering the second surface of the light-transmitting substrate 10. If this portion of light exits directly from the second surface 102 of the light-transmitting substrate 10, it will cause excessively high local brightness of the light-emitting substrate, resulting in poor brightness uniformity of the second surface 102. In this embodiment, a light-recovery unit 50 is provided. The light-recovery unit 50 scatters or reflects at least a portion of the light that is not reflected by the first reflective layer 20. After being scattered, the light disperses in all directions, thus avoiding the problem of excessive brightness in some areas of the light-emitting substrate. After being reflected, the light enters the surface of the second reflective layer 30 and is reflected. At least a portion of the light reflected by the second reflective layer 30 undergoes multiple reflections between the second reflective layer 30 and the second surface 102 before exiting through the second surface 102 of the light-transmitting substrate 10. This improves the uniformity of brightness of the light-emitting substrate and alleviates the problem of excessive brightness in some areas of the light-emitting substrate.

[0045] In this embodiment, the orthographic projection of the light-recovering unit 50 on the second surface 102 does not overlap with the orthographic projection of the first reflective layer 20 on the second surface 102 at least partially. Therefore, at least a portion of the surface of the light-recovering unit 50 facing the first reflective layer 20 is not blocked by the first reflective layer 20. This ensures that light not reflected by the first reflective layer 20 is incident on the surface of the light-recovering unit 50 and subsequently scattered or reflected by the light-recovering unit 50. Similarly, the orthographic projection of the light-recovering unit 50 on the second surface 102 does not overlap with the orthographic projection of the portion of the second reflective layer 30 (excluding the first through-hole 30a) on the second surface 102 at least partially. This ensures that at least a portion of the light reflected by the second reflective layer 30 is incident on the second surface 102 and subsequently exits through the second surface 102.

[0046] In one embodiment, the light-emitting unit 40 includes at least one light-emitting element 41, which may include a Micro LED and / or a Mini LED. The size (e.g., length) of the Micro LED is less than 50 micrometers, for example, 10 micrometers to 50 micrometers. The size (e.g., length) of the Mini LED is 50 micrometers to 150 micrometers, for example, 80 micrometers to 120 micrometers. When the light-emitting unit 40 includes two or more light-emitting elements 41, the light-emitting elements 41 of the same light-emitting unit 40 may be connected in series.

[0047] It should be noted that the critical angle for total internal reflection refers to the minimum angle of incidence at which total internal reflection occurs when light travels from a high-refractive-index medium to a low-refractive-index medium. It can be calculated using Snell's Law, specifically: θ = arcsin(n2 / n1). Here, θ is the critical angle for total internal reflection on the second surface 102, n1 is the refractive index of the medium the light passes through before reaching the second surface 102, and n2 is the refractive index of the medium the light enters after passing through the second surface 102. In this embodiment, the medium the light passes through before reaching the second surface 102 is the transparent substrate 10, and the medium the light enters after passing through the second surface 102 is air. In one embodiment, when the transparent substrate 10 is glass (refractive index 1.5), θ = arcsin(n2 / n1) = arcsin(1 / 1.5) ≈ 42°. That is, total internal reflection can occur when at least a portion of the light rays incident on the second surface 102 form an angle α between the light rays and the normal to the second surface 102 that is greater than 42°.

[0048] In this embodiment, the inner surface of the first groove 10a includes a side surface and a bottom surface. The side surface of the first groove 10a refers to a continuous portion of the inner surface of the first groove 10a, and the side surface of the first groove 10a is opposite to the protrusion 11. The bottom surface of the first groove 10a refers to a continuous portion of the inner surface of the first groove 10a. The bottom surface of the first groove 10a is not opposite to the protrusion 11, and the bottom surface of the first groove 10a is continuous with the bottom surface of the protrusion 11. The distance from any point on the bottom surface of the first groove 10a to the second surface 102 of the light-transmitting substrate 10 is not greater than the distance from any point on the side surface to the second surface 102 of the light-transmitting substrate 10.

[0049] In some embodiments, such as Figure 2 As shown, the light-transmitting substrate 10 includes a substrate body 12 and an auxiliary layer 13 located on the substrate body 12 facing the second reflective layer 30. The first surface 101 is the surface of the auxiliary layer 13 facing the second reflective layer 30. Further, in some embodiments, the outline of the opening surface of the first groove 10a is flush with the first surface 101 (not shown in the figure); in other embodiments, such as... Figure 2 As shown, the outline of the opening surface of the first groove 10a is flush with the side surface of the substrate body 12 facing the second reflective layer 30; in the direction from the first surface 101 to the second surface 102, the distance between the outline of the opening surface of the first groove 10a and the second surface 102 is less than the distance between the first surface 101 and the second surface 102.

[0050] In one embodiment, the refractive index of the substrate body 12 is greater than that of air. With this configuration, when light reflected by the second reflective layer 30 is incident on the second surface 102 of the substrate body 12 at an angle greater than the critical angle for total internal reflection, it can undergo total internal reflection and re-enter the second reflective layer 30. This further improves the uniformity of the emitted light. In some embodiments, the material of the substrate body 12 can be any one of glass, quartz, polymethyl methacrylate (PMMA), etc.

[0051] In some embodiments, the auxiliary layer 13 and the substrate body 12 are an integral structure, and the auxiliary layer 13 and the substrate body 12 are made of the same material. In other embodiments, the auxiliary layer 13 is made of a different material than the substrate body 12.

[0052] In some embodiments, the auxiliary layer 13 may be made of a transparent resin material.

[0053] In some embodiments, the thickness of the auxiliary layer 13 is approximately 1500 angstroms.

[0054] In some embodiments, the protrusion 11 is spaced apart from the side surface of the first groove 10a, specifically, there is a gap between the side surface of the protrusion 11 and the side surface of the first groove 10a.

[0055] In some embodiments, in the direction from the first surface 101 to the second surface 102, the area of ​​the cross section of the protrusion 11 parallel to the second surface 102 gradually increases. Specifically, in the direction from the first surface 101 to the second surface 102, the side surface of the protrusion 11 extends outward at an angle.

[0056] In some embodiments, the longitudinal cross-sectional shape profile of the side surface of the protrusion 11 may include a quasi-arc, a quasi-straight, or a quasi-broken line. "Quasi-arc" refers to a shape that is generally arc-shaped, but is not limited to a standard arc. That is, "arc" here includes not only the shape of a basic arc, but also shapes resembling arcs. For example, some points in the longitudinal cross-sectional shape profile of the protrusion 11 may not lie on the same circle as other points. "Quasi-straight" refers to a shape that is generally straight, but is not limited to a standard straight line. That is, "straight" here includes not only the shape of a basic straight line, but also shapes resembling straight lines. For example, some points in the longitudinal cross-sectional shape profile of the protrusion 11 may not lie on the same straight line as other points. "Quasi-broken line" refers to a shape that is generally broken, but is not limited to a standard broken line. That is, "broken line" here includes not only the shape of a basic broken line, but also shapes resembling broken lines. For example, a segment in the longitudinal cross-sectional shape profile of the protrusion 11 may be arc-shaped. "Longitudinal" refers to the direction perpendicular to the second surface 102 of the light-transmitting substrate 10.

[0057] In some embodiments, the distance from the surface of the protrusion 11 away from the second surface 102 to the second surface 102 is less than or equal to the distance from the first surface 101 to the second surface 102. In some examples, such as Figure 2 As shown, the distance x1 from the surface of the protrusion 11 away from the second surface 102 is less than the distance x2 from the first surface 101 to the second surface 102. In other examples, the distance from the surface of the protrusion 11 away from the second surface 102 to the second surface 102 is equal to the distance from the first surface 101 to the second surface 102 (not shown in the figure).

[0058] In some embodiments, the material of the protrusion 11 is the same as or similar to the material of the substrate body 12, which can improve the optical consistency between the substrate body 12 and the protrusion 11.

[0059] In some embodiments, such as Figure 2 As shown, the protrusion 11 and the substrate body 12 are an integral structure, and the protrusion 11 and the substrate body 12 are made of the same material and can be formed in the same process. In another embodiment, as... Figure 3 As shown, the protrusion 11 is not integrally formed with the substrate body 12, and the material of the protrusion 11 is different from that of the substrate body 12.

[0060] In some embodiments, such as Figure 2 As shown, the light-emitting substrate also includes a filler layer 60 filling the first groove 10a. The filler layer 60 is made of a transparent organic material, and the transmittance of the filler layer 60 can be greater than or equal to 95%.

[0061] In some embodiments, the first reflective layer 20 at least covers the side surface of the protrusion 11, wherein the side surface of the protrusion 11 refers to the surface of the protrusion 11 opposite to the side surface of the first groove 10a. In some embodiments, such as Figure 2 As shown, the first reflective layer 20 covers the entire area of ​​the side surface of the protrusion 11. In other embodiments, such as Figure 4 As shown, the first reflective layer 20 covers a portion of the side surface of the protrusion 11, while the remaining portion of the side surface of the protrusion 11 is exposed outside the first reflective layer 20.

[0062] In some embodiments, the first reflective layer 20 exposes at least a portion of the surface of the first groove 10a. Specifically, as... Figure 2 As shown, the first reflective layer 20 exposes at least a portion of the side surface of the first groove 10a; or, as Figure 4 As shown, the first reflective layer 20 exposes at least a portion of the side surface and at least a portion of the bottom surface of the first groove 10a.

[0063] In some embodiments, the orthographic projection of the first through-hole 30a on the second surface 102 of the light-transmitting substrate 10 overlaps with the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10. Specifically, this includes: Figure 2 As shown, the orthographic projection of the first through hole 30a on the second surface 102 of the light-transmitting substrate 10 is located within the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10; or, the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10 is located within the orthographic projection of the first through hole 30a on the second surface 102 of the light-transmitting substrate 10; or, a portion of the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10 is located within the orthographic projection of the first through hole 30a on the second surface 102 of the light-transmitting substrate 10, and another portion is located outside the orthographic projection of the first through hole 30a on the second surface 102 of the light-transmitting substrate 10.

[0064] In some embodiments, the light-emitting unit 40 and the second reflective layer 30 are located on the same side of the light-transmitting substrate 10. Specifically, the light-emitting unit 40 is located on the side of the second reflective layer 30 away from the light-transmitting substrate 10. Alternatively, the light-emitting unit 40 is located on the side of the second reflective layer 30 close to the light-transmitting substrate 10. Alternatively, a portion of the light-emitting unit 40 is located on the side of the second reflective layer 30 close to the light-transmitting substrate 10, and another portion is disposed in the same layer as the second reflective layer 30 or on the side of the second reflective layer 30 away from the light-transmitting substrate 10. Alternatively, a portion of the light-emitting unit 40 is located on the side of the second reflective layer 30 away from the light-transmitting substrate 10, and another portion is disposed in the same layer as the second reflective layer 30 or on the side of the second reflective layer 30 close to the light-transmitting substrate 10.

[0065] Preferably, the light-emitting element 41 is located on the side of the second reflective layer 30 away from the light-transmitting substrate 10, and the orthographic projection of the first through-hole 30a on the second surface 102 of the light-transmitting substrate 10 lies within the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10. This arrangement ensures that all light emitting light passing through the first through-hole 30a can be incident on the first groove 10a, avoiding the situation where light passes through the first through-hole 30a and exits directly through the light-transmitting substrate 10, thus helping to improve the brightness uniformity of the light-emitting substrate.

[0066] In some embodiments, such as Figure 2As shown, the first reflective layer 20 includes a first metal film layer. The reflectivity of the first metal film layer is greater than or equal to 85%, and its material may include at least one of aluminum, silver, copper, and platinum. In other embodiments, the first reflective layer 20 further includes a first transparent metal oxide layer located on the side of the first metal film layer facing the second surface 102 of the light-transmitting substrate 10, and a second transparent metal oxide layer located on the side of the first metal film layer away from the second surface 102 of the light-transmitting substrate 10. The materials of the first transparent metal oxide layer and the second transparent metal oxide layer may be indium tin oxide or indium zinc oxide, which can prevent the first metal film layer from being oxidized, thus reducing its reflectivity. In other embodiments, the material of the first reflective layer 20 may include white ink and / or silicone-based white glue.

[0067] In some embodiments, the thickness of the first reflective layer 20 is approximately 6000 angstroms.

[0068] In some embodiments, the second reflective layer 30 includes a second metal film layer. The reflectivity of the second metal film layer is greater than or equal to 85%, and its material may include at least one of aluminum, silver, copper, and platinum. In other embodiments, the second reflective layer 30 further includes a third transparent metal oxide layer located on the side of the second metal film layer facing the second surface 102 of the light-transmitting substrate 10, and a fourth transparent metal oxide layer located on the side of the second metal film layer away from the second surface 102 of the light-transmitting substrate 10. The materials of the third and fourth transparent metal oxide layers may be indium tin oxide or indium zinc oxide, which can prevent the second metal film layer from being oxidized, thus reducing its reflectivity. In other embodiments, the material of the second reflective layer 30 may include white ink and / or silicone-based white adhesive.

[0069] In some embodiments, the thickness of the second reflective layer 30 ranges from approximately 1500 angstroms.

[0070] In some embodiments, the light recovery unit 50 includes a light-transmitting material and scattering particles distributed in the light-transmitting material. This configuration allows some light to escape through the light recovery unit 50, preventing dark areas from forming in regions of the second surface 102 of the light-transmitting substrate 10 that are blocked by the light recovery unit 50, thus ensuring that the light is emitted as uniformly as possible and improving light uniformity. In one example, the scattering particles include inorganic metal oxide particles, such as at least one selected from titanium dioxide (TiO2), zirconium dioxide (ZrO2), zinc oxide (ZnO), aluminum oxide (Al2O3), and titanium dioxide (SiO2). In another example, the scattering particles include organic scattering particles, such as liquid crystal.

[0071] In some embodiments, the mass percentage of scattering particles in the light recovery unit 50 is less than or equal to 10%. In some examples, the scattering particles are titanium dioxide, and the mass percentage of titanium dioxide ranges from 3% to 5%.

[0072] In some embodiments, the light-transmitting material in the light recovery unit 50 includes a resin, a monomer, an initiator, an additive, and a solvent. The resin may be at least one of acrylic resin, phenolic resin, epoxy resin, and fluorene resin; the monomer may be at least one of monofunctional or polyfunctional acrylate monomers, such as methyl methacrylate, butyl methacrylate, dipentaerythritol hexaacrylate, and dipentaerythritol triacrylate; the initiator may be at least one of free radical initiators such as oxime esters and imidazoles; and the additive may be at least one of acrylic or F-type leveling agents, such as environmentally friendly high-performance PFAS-free surfactants, and silane coupling agents.

[0073] In some embodiments, the light recovery section 50 is a semi-transparent and semi-reflective structure. Thus, a portion of the light incident on the light recovery section 50 can be emitted through the light recovery section 50, while the other portion is reflected to the surface of the second reflective layer 30. Similar to the aforementioned embodiments, this also prevents the formation of a dark area on the second surface 102 of the light-transmitting substrate 10. In some examples, when the light recovery section 50 is a semi-transparent and semi-reflective structure, the structure includes a first dielectric layer and a second dielectric layer stacked together, with the first dielectric layer being made of a material with a different refractive index than the second dielectric layer. With this configuration, the light recovery section 50 constitutes a DBR (Distributed Bragg Reflector), which can selectively reflect light of specific wavelengths, thereby improving the color purity of the emitted light. The material of the first dielectric layer includes at least one of titanium dioxide (TiO2), tantalum pentoxide (Ta2O5), and zinc oxide (ZnO). The material of the second dielectric layer includes at least one of silicon dioxide (SiO2) and magnesium fluoride (MgF2).

[0074] In some embodiments, the light-recovering section 50 is a reflective structure. In this case, almost all light rays incident on the light-recovering section 50 are reflected. In some examples, the material of the light-recovering section 50 includes at least one of aluminum, silver, copper, and platinum.

[0075] In some embodiments, the thickness of the light-recovering portion 50 in the direction from the first surface 101 to the second surface 102 is less than or equal to 10 μm. Further, the thickness of the light-recovering portion 50 can be 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm.

[0076] In some embodiments, the light recovery unit 50 is provided with a second through hole 50a, and the orthographic projection of the second through hole 50a on the second surface 102 of the light-transmitting substrate 10 overlaps with the orthographic projection of the first through hole 30a on the second surface 102 of the light-transmitting substrate 10.

[0077] In this embodiment, by providing a second through hole 50a, some light can be emitted through the through hole 731, avoiding a large area of ​​dark area on the light-emitting substrate, and further improving the brightness uniformity and light output rate of the light-emitting substrate.

[0078] In some embodiments, such as Figure 2 As shown, the orthographic projection of the second through-hole 50a onto the second surface 102 of the light-transmitting substrate 10 lies within the orthographic projection of the first through-hole 30a onto the second surface 102 of the light-transmitting substrate 10. In other embodiments, a portion of the orthographic projection of the second through-hole 50a onto the second surface 102 of the light-transmitting substrate 10 overlaps with the orthographic projection of the first through-hole 30a onto the second surface 102 of the light-transmitting substrate 10, while another portion does not overlap with the orthographic projection of the first through-hole 30a onto the second surface 102 of the light-transmitting substrate 10. In other embodiments, such as... Figure 5 As shown, the orthographic projection of the first through hole 30a on the second surface 102 of the light-transmitting substrate 10 lies within the orthographic projection of the second through hole 50a on the second surface 102 of the light-transmitting substrate 10.

[0079] In some embodiments, such as Figure 2 As shown, in some embodiments, the light-emitting unit 40 includes a light-emitting element 41 and a color conversion layer 42 located on the side of the light-emitting element 41 near the light-transmitting substrate 10. In this embodiment, the light emitted by the light-emitting element 41 can be converted into white light by the color conversion layer 42, thereby improving the utilization rate of light energy.

[0080] In one embodiment, such as Figure 2 As shown, both the light-emitting element 41 and the color conversion layer 42 are located on the side of the second reflective layer 30 away from the light-transmitting substrate 10. The surface of the color conversion layer 42 near the second surface 102 is located inside the first through-hole 30a; in the direction from the first surface 101 to the second surface 102, the distance between the side of the first through-hole 30a near the second surface 102 and the light-recovering part 50 is H; the distance between the outer contour of the orthographic projection of the first through-hole 30a on the second surface 102 and the outer contour of the orthographic projection of the light-recovering part 50 on the second surface 102 is X, and the ratio of X to H is greater than 0.7.

[0081] In this embodiment, by setting the ratio of X to H to be greater than 0.7, most incident light rays with an incident angle less than or equal to the critical angle of total internal reflection are incident on the light recovery unit 50, so that the light recovery unit 50 can scatter or reflect this part of the light, thus effectively improving the problem of high brightness in some areas of the light-emitting substrate. Specifically, the critical angle of total internal reflection θ of the second surface 102 is determined by the material of the structure before and after the light passes through the second surface 102. When X > H × tanθ = H × tan[arcsin(n2 / n1)], where n1 is the refractive index of the medium through which the light passes before reaching the second surface 102, and n2 is the refractive index of the medium into which the light enters after passing through the second surface 102, it can be ensured that all light rays with an incident angle less than θ are incident on the light recovery unit 50. Typically, the critical angle of total internal reflection θ of the second surface 102 of the light-transmitting substrate ranges from 35° to 55°. When θ is 35°, X > H × tan35° = 0.7H. Setting X > 0.7H ensures that most light rays with an incident angle less than θ are incident on the light recovery unit 50. In one embodiment, the light-transmitting substrate 10 is made of glass with a refractive index n1 of 1.5, and the medium into which the light enters after passing through the second surface 102 is air with a refractive index n2 of 1. In this case, X > H × tan42° = 0.9H can be set.

[0082] In one embodiment, such as Figure 2 As shown, the refractive index of the filling layer 60 located in the first groove 10a is close to that of the light-transmitting substrate 10, so the light will not be deflected when it passes through the interface between the filling layer 60 and the light-transmitting substrate 10.

[0083] In some embodiments, such as Figure 2 As shown, the outline of the orthographic projection of the color conversion layer 42 on the second surface 102 coincides with the outline of the orthographic projection of the first through-hole 30a on the second surface 102. In other embodiments, the orthographic projection of the first through-hole 30a on the second surface 102 is located within the orthographic projection of the color conversion layer 42 on the second surface 102, with a portion of the color conversion layer 42 located within the first through-hole 30a and another portion located on the side of the second reflective layer 30 away from the light-transmitting substrate 10.

[0084] In other embodiments, such as Figure 6 or Figure 7 As shown, the color conversion layer 42 is located in the first groove 10a. In the direction from the first surface 101 to the second surface 102, the distance between the surface of the color conversion layer 42 away from the second surface 102 and the light recovery part 50 is H; the distance between the outer contour of the orthographic projection of the color conversion layer 42 on the second surface 102 and the outer contour of the orthographic projection of the light recovery part 50 on the second surface 102 is X, and the ratio of X to H is greater than 0.7.

[0085] This embodiment is similar to the previous embodiment. When the color conversion layer 42 is located within the first groove 10a, the light emitted by the color conversion layer 42 is directed in various directions. Without considering the partial deflection of incident light at the interface between the filling layer 60 and the light-transmitting substrate 10, the light-emitting area formed by all incident light illuminating the second surface 102 is determined by the position of the outline of the color conversion layer 42. Therefore, by setting the ratio of X to H to be greater than 0.7, the light recovery unit 50 can scatter or reflect this portion of light that was originally directly emitted from the second surface 102. The reflected light then illuminates the second reflective layer 30 and is reflected a second time, avoiding direct light emission and improving the uniformity of light emission from the second surface 102.

[0086] In some embodiments, such as Figure 6 As shown, the color conversion layer 42 fills the first groove 10a. In other embodiments, such as Figure 7 As shown, the color conversion layer 42 covers the first reflective layer 20.

[0087] In some embodiments, the material of the color conversion layer 42 is a fluorescent material. Since the fluorescent material has good water and oxygen resistance, the light-emitting substrate may not need to be provided with an encapsulation layer for encapsulating the color conversion layer 42, which can further reduce the thickness of the light-emitting substrate and reduce the manufacturing cost of the light-emitting substrate.

[0088] In some embodiments, the thickness of the color conversion layer 42 is approximately 20 μm to 30 μm in the direction from the first surface 101 to the second surface 102.

[0089] In some embodiments, such as Figure 2 As shown, when the surface of the color conversion layer 42 near the second surface 102 is located within the first through-hole 30a, the light-emitting substrate further includes a defining structure 70. The defining structure 70 has a defining opening, and at least a portion of the color conversion layer 42 fills the defining opening. The material of the defining structure 70 includes a light-shielding material. In one example, the material of the defining structure 70 includes a black matrix material.

[0090] In some embodiments, such as Figure 2 As shown, the outer contour of the orthographic projection of the first reflective layer 20 onto the second surface 102 coincides with the contour of the orthographic projection of the second through-hole 50a of the light-recovering section 50 onto the second surface 102. This ensures that all areas of the surface of the light-recovering section 50 near the first reflective layer 20 are used to scatter or reflect light, improving material utilization. In other embodiments, such as... Figure 8As shown, the outer contour of the orthographic projection of the first reflective layer 20 on the second surface 102 falls within the orthographic projection of the light recovery unit 50 on the second surface 102. This arrangement prevents light not reflected by the first reflective layer 20 from entering and exiting the second surface 102 through the second through-hole 50a of the light recovery unit 50, thereby improving the uniformity of light emitted from the second surface 102. Furthermore, the contour of the second through-hole 50a of the light recovery unit does not need to completely coincide with the contour of the first reflective layer 20, thus reducing the requirements for the size and positional accuracy of the light recovery unit 50 and simplifying the manufacturing process.

[0091] In some embodiments, such as Figure 8 As shown, the outer contour of the orthographic projection of the first through-hole 30a on the second surface 102 is located inside the outer contour of the orthographic projection of the first reflective layer 20 on the second surface 102. This allows most of the light emitted through the first through-hole 30a to be reflected by the first reflective layer 20, thereby further reducing the probability of direct light emission and improving the uniformity of light emission from the light-emitting substrate.

[0092] In some embodiments, such as Figure 2 As shown, the second surface 102 has a second groove 10b, and at least a portion of the light-recovering portion 50 is located within the second groove 10b. This arrangement allows a portion of the light-transmitting substrate 10 to be utilized to accommodate the light-recovering portion 50, thus mitigating the problem of the light-recovering portion 50 increasing the overall thickness of the light-emitting substrate. In some examples, the entire light-recovering portion 50 is located within the second groove 10b, completely avoiding the increase in the overall thickness of the light-emitting substrate and facilitating the thinning of the light-emitting substrate. Furthermore, in some embodiments, when the light-recovering portion 50 comprises a light-transmitting material and scattering particles distributed within the light-transmitting material, the light-recovering portion 50 can be prepared by forming the second groove 10b on the second surface 102, so that the scattering particles can be uniformly dispersed in the light-transmitting material.

[0093] In some embodiments, such as Figure 9 As shown, the second surface 102 is planar, and the light-recovering portion 50 is located on the side of the second surface 102 of the light-transmitting substrate 10 away from the first surface 101. When the light-transmitting substrate 10 is made of glass, forming a groove on the glass is difficult. Therefore, the light-recovering portion 50 can be formed directly on the second surface 102 of the light-transmitting substrate 10, eliminating the need to form a groove on the light-transmitting substrate 10 and reducing the difficulty of the fabrication process. Furthermore, in some embodiments, when the light-recovering portion 50 is a semi-transparent and semi-reflective structure or a reflective structure, it can be fabricated by directly forming a thin film on the entire second surface to simplify the fabrication process.

[0094] Furthermore, when the light recovery unit 50 is located on the side of the second surface 102 of the light-transmitting substrate 10 away from the first surface 101, it can be prepared by means of a temporary mask layer. Specifically, a temporary mask layer film is first formed on the second surface 102, and then the temporary mask layer film is patterned to form a temporary mask layer with temporary grooves. The light recovery unit 50 is then formed in the temporary grooves, and finally the temporary mask layer is removed.

[0095] In some embodiments, such as Figure 2 As shown, the light-transmitting substrate 10 has a plurality of spaced-apart light-collecting structures 31 on the side near the second reflective layer 30. The light-collecting structures 31 can disperse the light incident on the second reflective layer 30 so that it is scattered in various directions. Specifically, the light reflected by the second surface 102 is dispersed by the light-collecting structures 31 after it is incident on the second reflective layer 30, changing the propagation direction of the light, and after being reflected by the second reflective layer 30, it is emitted through the second surface 102 of the light-transmitting substrate 10, which can improve the brightness uniformity of the light-emitting substrate.

[0096] In one embodiment, the light-collecting structures 31 are uniformly distributed across the surface of the second reflective layer 30 facing the light-transmitting substrate 10, and the distance between the light-collecting structure 31 closest to the edge of the first groove 10a and the first groove 10a is less than or equal to 5 μm. This arrangement avoids a large distance between the light-collecting structure 31 and the first groove 10a, which would prevent light reflected by the second reflective layer 30 from reaching the light-collecting structure 31 in the area between the light-collecting structure 31 and the first groove 10a, thus preventing sufficient scattering of this portion of the light.

[0097] In one embodiment, the ratio of the maximum width to the height of the light-collecting structure 31 in the direction parallel to the second surface 102 ranges from 1.5 to 3.5. This configuration results in better light uniformity from the light-collecting structure 31. In some embodiments, the ratio is 1.5, 2, 2.5, 3, 3.5, etc.

[0098] In some embodiments, such as Figure 2 As shown, the light-transmitting substrate 10 includes a plurality of microstructures 131, the light-collecting structure 31 is a first protrusion 311, and the microstructure 131 is a recessed structure 1311, with each first protrusion 311 located within the corresponding recessed structure 1311.

[0099] In some embodiments, when the light-collecting structure 31 is a first protrusion 311, the material of the light-collecting structure 31 is a reflective material or a scattering material. In some examples, the material of the light-collecting structure 31 is a metal, preferably, the material of the light-collecting structure 31 includes at least one of aluminum, silver, copper, and platinum. In other examples, the material of the light-collecting structure 31 includes a substrate and scattering particles coated on the substrate. The substrate may include at least one of polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), and epoxy resin. The scattering particles may include at least one of titanium dioxide (TiO2), alumina (Al2O3), silicon dioxide (SiO2), polystyrene microspheres, and metal nanoparticles.

[0100] In this embodiment, the first surface 101 is made into an uneven surface by combining multiple spaced first protrusions 311 with the first reflective layer 20, so that the light irradiated on the surface of the first reflective layer 20 facing the light-transmitting substrate 10 is scattered and dispersed in all directions, so that the reflected light is uniformly emitted through the second surface 102.

[0101] In other embodiments, such as Figure 10 As shown, the light-collecting structure 31 is a recessed portion 312, and the microstructure 131 includes a plurality of spaced second protrusions 1312 disposed on the first surface 101 of the light-transmitting substrate 10, with each second protrusion 1312 located within a recessed portion 312. Similar to the aforementioned embodiment, this allows light to be uniformly emitted after reflection by the first reflective layer 20. The recessed portion 312 is disposed on the surface of the first reflective layer 20 facing the light-transmitting substrate 10.

[0102] In some embodiments, when the light-collecting structure 31 is a recess 312, the material of the light-collecting structure 31 is a reflective material. In some examples, the material of the light-collecting structure 31 is a metal, preferably, the material of the light-collecting structure 31 includes at least one of aluminum, silver, copper and platinum.

[0103] In some embodiments, the first reflective layer 20 and the light-collecting structure 31 are made of the same material. Preferably, such as Figure 2 or Figure 9 As shown, the first reflective layer 20 and the light-collecting structure 31 are an integral structure.

[0104] In some embodiments, the shape of the first protrusion 311 or the recess 312 may be approximately one of a cone, a pyramid, and a spherical cap. "Approximately cone and pyramid" means that it is generally cone-shaped or pyramidal, but is not limited to standard cones and pyramids. That is, "cone and pyramidal" here includes not only the shapes of basic cones and pyramids, but also shapes similar to cones and pyramids. For example, the apex of a cone or pyramid is a curved surface. "Approximately spherical cap" means that it is generally spherical cap, but is not limited to a standard spherical cap. That is, "spherical cap" here includes not only the shape of a basic spherical cap, but also shapes similar to spherical caps. For example, the upper half of a spherical cap is a standard spherical cap, and the lower half is a cylinder.

[0105] In some embodiments, such as Figure 2 or Figure 10 As shown, the microstructure 131 is disposed on the auxiliary layer 13. In this embodiment, by using the auxiliary layer 13 to dispose of the microstructure 131, the formation of the first protrusion 311 or the recess 312 is facilitated.

[0106] Furthermore, in this embodiment, the auxiliary layer 13 is made of a different material than the substrate body 12. In other embodiments, the auxiliary layer 13 and the substrate body 12 are an integral structure (not shown in the figure).

[0107] In some embodiments, the maximum size of the microstructure 131 in the cross-section parallel to the second surface 102 of the light-transmitting substrate 10 ranges from 5 μm to 50 μm. This configuration allows for better light uniformity in the formed light-collecting structure 31, and the microstructure 131 is easy to fabricate. In some embodiments, the maximum size of the microstructure 131 in the cross-section parallel to the second surface 102 of the light-transmitting substrate 10 is 5 μm, 15 μm, 25 μm, 35 μm, 45 μm, 50 μm, etc.

[0108] In one embodiment, in the direction from the first surface 101 to the second surface 102, the area of ​​the first groove 10a parallel to the cross section of the second surface 102 gradually decreases.

[0109] In one embodiment, the area surrounding the protrusion 11 on the bottom surface of the first groove 10a is a plane.

[0110] In one embodiment, such as Figure 1 and Figure 2 As shown, the line connecting the geometric center of the protrusion 11 and the geometric center of the first groove 10a is perpendicular to the second surface 102 of the light-transmitting substrate 10.

[0111] Furthermore, the center of the orthographic projection of the protrusion 11 on the second surface 102 of the light-transmitting substrate 10 coincides with the center of the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10.

[0112] Furthermore, such as Figure 1 and Figure 2 As shown, the outer contour of the orthographic projection of the protrusion 11 on the second surface 102 of the light-transmitting substrate 10 is circular, and the outer contour of the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10 is circular; the center of the outer contour of the orthographic projection of the protrusion 11 on the second surface 102 of the light-transmitting substrate 10 coincides with the center of the outer contour of the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10.

[0113] Furthermore, the protrusion 11 includes a vertex, and the orthographic projection of the vertex of the protrusion 11 on the second surface 102 of the light-transmitting substrate 10 coincides with the center of the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10.

[0114] In one embodiment, the ratio of the radius of the outer contour of the orthographic projection of the protrusion 11 on the second surface 102 of the light-transmitting substrate 10 to the radius of the outer contour of the orthographic projection of the first groove 10a on the second surface 102 of the light-transmitting substrate 10 is less than 0.5.

[0115] In some embodiments, such as Figures 2 to 9 As shown in any of the accompanying figures, the light-emitting substrate further includes a plurality of conductive pads 91 disposed on the side of the first reflective layer 20 away from the second surface 102 of the light-transmitting substrate 10. Each light-emitting element 41 includes at least two pins 411, and each pin 411 is connected to a conductive pad 91. The light-emitting substrate may also include signal lines (not shown in the figure) disposed on the same layer as the conductive pads 91.

[0116] In some embodiments, the light-emitting substrate further includes an insulating layer 92, which is located between the first reflective layer 20 and the conductive pad 91. When the first reflective layer 20 is made of a metal material, the insulating layer 92 can be used to prevent the formation of an electrical connection between the conductive pad 91 and the first reflective layer 20, which could lead to a short circuit between different conductive pads 91.

[0117] In some embodiments, such as Figures 2 to 9As shown in any of the accompanying figures, the light-emitting substrate further includes a third reflective layer 93, which covers the light-emitting element 41, and has a light-emitting aperture on the side of the third reflective layer 93 facing the light-transmitting substrate 10. The orthographic projection of the light-emitting area of ​​the light-emitting element 41 onto the second surface 102 of the light-transmitting substrate 10 falls within the orthographic projection of a light-emitting aperture onto the second surface 102 of the light-transmitting substrate 10. The third reflective layer 93 can reflect the light emitted by the light-emitting element 41 from the non-light-emitting area, thereby improving the light utilization rate. The third reflective layer 93 can cover the surface of the light-emitting element 41 away from the light-transmitting substrate 10, the side surface of the light-emitting element 41, and the portion of the surface of the light-emitting element 41 close to the light-transmitting substrate 10.

[0118] In one embodiment, the material of the third reflective layer 93 includes at least one of white ink and silicone-based white adhesive. For example, the material of the third reflective layer 93 may be white ink or silicone-based white adhesive.

[0119] In one embodiment, such as Figures 2 to 9 As shown in any of the accompanying figures, the light-emitting substrate also includes an alignment structure 94 located between the substrate body 12 and the auxiliary layer 13. During the fabrication of the light-emitting substrate, the alignment structure 94 facilitates the alignment of the photomask. The material of the alignment structure 94 can be amorphous silicon. The thickness of the alignment structure 94 can be approximately 1000 angstroms.

[0120] This application also provides a method for preparing a light-emitting substrate.

[0121] The following is an appendix. Figure 2 Taking the light-emitting substrate shown as an example, the detailed process of the fabrication method is introduced:

[0122] Step 100: As Figure 11 As shown, a mask layer 95 and an alignment structure 94 are disposed on the first surface 101 of the substrate 12'. Figure 12 As shown, the mask layer 95 includes a first mask portion 951 and at least one second mask portion 952. The first mask portion 951 has at least one mask through-hole 951a. A second mask portion 952 is located within one mask through-hole 951a of the first mask portion 951, and there is a gap between the second mask portion 952 and the first mask portion 951. The surface of the second mask portion 952 may be circular, and the mask through-hole 951a of the first mask portion 951 may be circular. The center of the surface of each second mask portion 952 may coincide with the center of the mask through-hole 951a of the first mask portion 951 to which it is located. The diameter of the surface of the second mask portion 952 is D1, the diameter of the through-hole of the first mask portion 951 may be D2, and the distance between the edge of the mask through-hole 951a of the first mask portion 951 and the edge of the second mask portion 952 is a, then D2 = D1 + 2a;

[0123] In some embodiments, D1 ≥ 5 μm. The value of D1 is related to the height of the subsequently formed protrusion 11; the larger D1 is, the greater the height of the formed protrusion 11. By setting D1 ≥ 5 μm, it is possible to avoid the protrusion 11 being too small in height, which would result in the first reflective layer 20 covering the side of the protrusion 11 being too small in height. Consequently, the amount of light emitted by the light-emitting unit 40 being reflected by the first reflective layer 20 would be less, failing to effectively improve the utilization rate of light.

[0124] In some embodiments, a ≥ 2 μm. This setting avoids the distance between the edge of the mask via 951a of the first mask portion 951 and the edge of the second mask portion 952 being too small, which would affect the contact between the etching solution and the substrate 12'.

[0125] In some embodiments, the material of the mask layer 95 may be a metal, such as molybdenum. The mask layer 95 may be formed using a photomask.

[0126] Step 200: As Figure 13 As shown, a wet etching process is used to etch the substrate 12' to form a first groove 10a, and a substrate body 12 including the first groove 10a and a protrusion 11 located in the first groove 10a are obtained.

[0127] In this step, the etching solution contacts the substrate 12' through the gap between the first mask portion 951 and the second mask portion 952, and etches the substrate 12' to form the substrate body 12 and the protrusion 11. Due to the presence of the second mask portion 952, the area of ​​the substrate 12' covered by it is not completely etched away; the retained area is the protrusion 11. Both the substrate body 12 and the protrusion 11 are part of the substrate 12', that is, the substrate body 12 and the protrusion 11 are integrally formed; there is a gap between the protrusion 11 and the side of the first groove 10a. In this step, while the etching solution is etching the substrate 12', when the etching solution etches away the portion of the substrate 12' covered by the second mask portion 952, the second mask portion 952 will fall into the first groove 10a and be immersed in the etching solution and etched away.

[0128] Step 300: As Figure 14 As shown, the first mask portion 951 is removed.

[0129] Step 400: As Figure 15 As shown, a first reflective layer 20 and a filling layer 60 are sequentially formed in the first groove 10a.

[0130] Step 500: As Figure 16As shown, an auxiliary layer 13, a second reflective layer 30, and a plurality of light-collecting structures 31 arranged at intervals on the side of the substrate body 12 and the filling layer 60 away from the second surface 102 are sequentially formed. The substrate body 12 and the auxiliary layer 13 together constitute the light-transmitting substrate 10. Then, an insulating thin film layer 92' is formed on the side of the second reflective layer 30 away from the light-transmitting substrate 10.

[0131] Step 600: As Figure 17 As shown, a second groove 10b is formed on the second surface 102 of the light-transmitting substrate 10.

[0132] In some embodiments, the second groove 10b may be formed using a TGV etching process.

[0133] Step 700: As Figure 18 As shown, a light-recovery section 50 is formed in the second groove 10b.

[0134] Step 800: As Figure 19 As shown, the insulating film layer 92' is patterned to form the insulating layer 92, and a limiting structure 70 is formed on the side of the insulating layer 92 away from the light-transmitting substrate 10. The limiting structure 70 has a plurality of spaced limiting openings, and then a color conversion layer 42 corresponding to each limiting opening is formed in each limiting opening.

[0135] Step 900: As Figure 20 As shown, a conductive pad 91 is formed on the side of the insulating layer 92 away from the light-transmitting substrate 10.

[0136] Step 1000: As Figure 21 As shown, the light-emitting element 41 is bonded to the conductive pad 91;

[0137] Step 1100: As Figure 22 As shown, a third reflective layer 93 is formed on the side of the light-emitting element 41 away from the light-transmitting substrate 10.

[0138] The embodiments of the method for preparing the light-emitting substrate provided in this application and the embodiments of the light-emitting substrate belong to the same inventive concept. The relevant details and beneficial effects can be referred to each other, and will not be repeated here.

[0139] In some embodiments, steps 600 and 700 may be performed after step 300 and before step 500. Further, in some embodiments, steps 600 and 700 may be performed before step 400. In other embodiments, steps 600 and 700 may be performed after step 400. This avoids damage to the auxiliary layer 80 and the light-collecting structure 31 caused by the process step of forming the second groove 10b on the second surface 102 of the light-transmitting substrate 10 in step 600.

[0140] In some other embodiments, steps 600 and 700 may also be performed before step 100.

[0141] In some embodiments, the preparation processes in steps 600 and 700 can be replaced by the following steps:

[0142] First, a temporary mask layer film is formed on the second surface 102. Then, the temporary mask layer film is patterned to form a temporary mask layer with temporary grooves. Next, a light-receiving part 50 is formed in the temporary grooves. Finally, the temporary mask layer is removed. This avoids damage to the second surface 102 of the light-transmitting substrate 10 caused by etching.

[0143] This application also provides a display device, which includes the aforementioned light-emitting substrate and a display panel located on the side of the light-transmitting substrate 10 away from the light-emitting unit 40. The display panel may be a liquid crystal display panel, and the light-emitting substrate may serve as a backlight module.

[0144] It should be noted that the display device can be any device that displays images, whether moving (e.g., video) or fixed (e.g., still images), and whether it contains text or images. More specifically, the intended embodiments can be implemented in or associated with a variety of electronic devices, such as (but not limited to) mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, camcorders, game consoles, watches, clocks, calculators, television monitors, flat panel displays, computer monitors, automotive displays (e.g., odometer displays, etc.), navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rearview cameras in vehicles), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging and aesthetic structures (e.g., displays of images of a piece of jewelry), etc.

[0145] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for limiting purposes. The description of features or aspects within each embodiment should generally be considered as other similar features or aspects that may be used in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope defined by the claims and their equivalents.

Claims

1. A light-emitting substrate, characterized in that, include: A light-transmitting substrate includes opposing first and second surfaces, and the light-transmitting substrate has a first groove with an opening facing the first surface; The protrusion is located within the first groove and is spaced apart from the side surface of the first groove; in the direction from the first surface to the second surface, the area of ​​the cross section of the protrusion parallel to the second surface gradually increases; A first reflective layer is located within the first groove, at least covering the side surface of the protrusion, and exposing at least a portion of the first groove; The second reflective layer is located on the side of the light-transmitting substrate away from the second surface. The second reflective layer is provided with a first through hole. The orthographic projection of the first through hole on the second surface of the light-transmitting substrate overlaps with the orthographic projection of the first groove on the second surface of the light-transmitting substrate. The light-emitting unit and the second reflective layer are located on the same side of the light-transmitting substrate, and the light emitted by the light-emitting unit enters the first groove through the first through hole; A light-recovery section is located on the side of the first reflective layer near the second surface, and is used to scatter or reflect light incident on the light-recovery section; the orthographic projection of the light-recovery section on the second surface does not overlap with the orthographic projection of the first reflective layer on the second surface at least partially, and the orthographic projection of the light-recovery section on the second surface does not overlap with the orthographic projection of the portion of the second reflective layer other than the first through-hole on the second surface at least partially.

2. The light-emitting substrate according to claim 1, characterized in that, The light recovery unit is provided with a second through hole, and the orthographic projection of the second through hole on the second surface overlaps with the orthographic projection of the first through hole on the second surface.

3. The light-emitting substrate according to claim 1, characterized in that, The light-emitting unit includes a color conversion layer, the surface of the color conversion layer near the second surface being located within the first through hole; in the direction from the first surface to the second surface, the distance between the side of the first through hole near the second surface and the light-recovering part is H; the distance between the outer contour of the orthographic projection of the first through hole on the second surface and the outer contour of the orthographic projection of the light-recovering part on the second surface is X, and the ratio of X to H is greater than 0.

7.

4. The light-emitting substrate according to claim 1, characterized in that, The light-emitting unit includes a color conversion layer located in the first groove. In the direction from the first surface to the second surface, the distance between the surface of the color conversion layer away from the second surface and the light-recovering part is H. The distance between the outer contour of the orthographic projection of the color conversion layer on the second surface and the outer contour of the orthographic projection of the light-recovering part on the second surface is X. The ratio of X to H is greater than 0.

7.

5. The light-emitting substrate according to claim 1, characterized in that, The outer contour of the orthographic projection of the first reflective layer on the second surface falls within the orthographic projection of the light-recovering part on the second surface.

6. The light-emitting substrate according to claim 1, characterized in that, The outer contour of the orthographic projection of the first through hole on the second surface is located inside the outer contour of the orthographic projection of the first reflective layer on the second surface.

7. The light-emitting substrate according to claim 1, characterized in that, The light-transmitting substrate and the protrusion are an integral structure; Alternatively, the materials of the light-transmitting substrate and the protrusion may be different.

8. The light-emitting substrate according to claim 1, characterized in that, The second surface has a second groove, and at least a portion of the light-recovering portion is located within the second groove; Alternatively, the second surface is planar, and the light-recovering portion is located on the side of the second surface of the light-transmitting substrate away from the first surface.

9. The light-emitting substrate according to claim 1, characterized in that, The light recovery unit includes a light-transmitting material and scattering particles distributed in the light-transmitting material; Alternatively, the light recovery section may have a semi-transparent, semi-reflective structure; Alternatively, the light-recovering section may be a reflective structure.

10. The light-emitting substrate according to claim 1, characterized in that, The light-transmitting substrate has multiple light-collecting structures arranged at intervals on the side near the second reflective layer.

11. The light-emitting substrate according to claim 10, characterized in that, The light-transmitting substrate includes multiple microstructures, wherein, The light-collecting structure is a first protrusion, and the microstructure is a recessed structure, with each first protrusion located within a corresponding recessed structure; or... The light-collecting structure is a recessed portion, and the microstructure is a second protrusion, with each recessed portion covering the corresponding second protrusion.

12. The light-emitting substrate according to claim 11, characterized in that, The light-transmitting substrate includes a substrate body and an auxiliary layer located on the substrate body facing the second reflective layer, and the microstructure is disposed on the auxiliary layer.

13. A display device, characterized in that, It includes a light-emitting substrate as described in any one of claims 1 to 12, and a display panel located on the side of the light-transmitting substrate away from the light-emitting unit.

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