Light-emitting substrate and manufacturing method therefor, display module, and display device

Abstract

Disclosed are a light-emitting substrate and a manufacturing method therefor, a display module, and a display device. The light-emitting substrate comprises: a first base, comprising a first surface, a second surface, and a first recess; a protruding portion, wherein in a direction from the first surface to the second surface, a first width of the protruding portion gradually increases; a light-emitting unit; and a light extraction structure. The protruding portion comprises a first reflective surface; the first reflective surface is inclined relative to the second surface; and the orthographic projection of the first reflective surface on the second surface surrounds a geometric center, or the geometric center is located within the orthographic projection of the first reflective surface on the second surface. The first reflective surface is presented as two target line segments in the cross section. The target line segments are both straight line segments; or the target line segments are both target curved line segments; or one of the target line segments is a straight line segment, and the other is a target curved line segment. The distance between any point on the target curved line segment and a straight line connecting a first endpoint and a second endpoint is less than 1 / 11 of the length of the straight line connecting the first endpoint and the second endpoint.

Description

Light-emitting substrate and its preparation method, display module and display device Technical Field

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

[0002] Passive light emission display devices mainly consist of a display panel and a backlight module. The display panel is located on the light-emitting side of the backlight module and is used to modulate the light emitted from the backlight module to achieve image display. Due to the trend of display devices becoming thinner, the thinning of the backlight module is a research hotspot in the industry. Summary of the Invention

[0003] This disclosure provides a light-emitting substrate, which includes:

[0004] The first substrate includes: a first surface and a second surface opposite to each other, and a first groove located on the first surface;

[0005] The protrusion is located within the first groove; in a cross section passing through the geometric center of the orthographic projection of the protrusion onto the second surface and along the thickness direction of the first base, the width of the protrusion in the first direction is a first width, and the first width gradually increases in the direction from the first surface to the second surface, wherein the first direction is the direction located in the cross section and parallel to the first base; the protrusion includes a first reflective surface;

[0006] The light-emitting unit is located on the side of the protrusion away from the first substrate and is used to emit light toward the first reflective layer;

[0007] The light extraction structure is formed in the first surface or located on the side of the first surface away from the second surface;

[0008] Wherein, the first reflective surface is at least a portion of the surface located on the side of the protrusion away from the second surface, the first reflective surface is inclined relative to the second surface, and the orthographic projection of the first reflective surface on the second surface surrounds the geometric center, or the geometric center is located inside the orthographic projection of the first reflective surface on the second surface.

[0009] The first reflective surface appears as two opposing target line segments in the cross-section;

[0010] The target line segments are all straight line segments, or the target line segments are all target curve segments, or one of the target line segments is a straight line segment and the other is a target curve segment; the target curve segment has a first endpoint and a second endpoint, and the distance between any point on the target curve segment and the straight line connecting the first endpoint and the second endpoint is less than 1 / 11 of the length of the straight line connecting the first endpoint and the second endpoint.

[0011] In some embodiments, the protrusion includes a base portion and a first reflective layer located on the side of the base portion away from the second surface, the first reflective layer having a first reflective surface, or...

[0012] The protrusion is made of metal, and the metal has a first reflective surface.

[0013] In some embodiments, the protrusion includes a base portion and a first reflective layer located on the side of the base portion away from the second surface, the first reflective layer having a first reflective surface, wherein the base portion and the first substrate are integral structures made of the same material.

[0014] In some embodiments, the included angle θq between the first reflective surface and the second surface satisfies: Where 32°≤θc≤34.5°.

[0015] In some embodiments, the substrate includes scattering particles, at least in the region where the substrate contacts the bottom of the first groove.

[0016] In some embodiments, the material of the substrate includes: a substrate and scattering particles dispersed in the substrate.

[0017] In some embodiments, the mass concentration of scattering particles in the matrix is ​​greater than or equal to 20% and less than or equal to 70%.

[0018] In some embodiments, the light-emitting substrate further includes:

[0019] A color conversion structure is located on the side of the protrusion facing away from the first substrate; in the direction parallel to the second surface, the distance between the edge of the color conversion structure and the edge of the protrusion is a first distance; in the direction perpendicular to the second surface, the distance between the surface of the color conversion structure facing away from the protrusion and the plane containing the edge of the protrusion is a second distance; the first distance h1 and the second distance h2 satisfy:

[0020] In some embodiments, the light-emitting substrate further includes:

[0021] The light-transmitting filling portion is located within the first groove on the side of the protrusion opposite to the bottom of the first groove; the light-transmitting filling portion includes a first opening exposing a portion of the protrusion, and the color conversion structure is located at least within the first opening.

[0022] In some embodiments, the material of the light-transmitting filling portion includes at least one of the following: polyvinyl chloride, polyvinyl alcohol, polylactic acid, polymethyl methacrylate, polyvinylpyrrolidone, polyethylene terephthalate, and polycarbonate; and at least one of the following: glass, polymethyl methacrylate, and polycarbonate.

[0023] In some embodiments, the light-emitting substrate further includes:

[0024] The second reflective layer is located on the side of the light-transmitting filling portion away from the first substrate; the second reflective layer includes a second opening, the orthographic projection of the second opening onto the first substrate coincides with the orthographic projection of the first opening onto the first substrate; the color conversion structure also includes a portion located within the second opening;

[0025] The encapsulation planarization layer is located on the side of the second reflective layer and the color conversion structure that is away from the first substrate; the orthographic projection of the encapsulation planarization layer onto the first substrate covers the orthographic projection of the second reflective layer and the color conversion structure onto the first substrate.

[0026] In some embodiments, the light-emitting substrate further includes:

[0027] The padding layer is located between the second reflective layer and the encapsulation planarization layer; the padding layer includes a third opening, the orthographic projection of the third opening onto the first substrate coincides with the orthographic projection of the first opening onto the first substrate; the color conversion structure also includes a portion located within the third opening.

[0028] In some embodiments, the light extraction structure includes a plurality of second grooves; the light extraction structure is located on the side of the second reflective layer facing the first surface; the orthographic projection of the light extraction structure perpendicular to the first surface surrounds the first groove; in the direction perpendicular to the first surface, the cross-sectional shape of the first groove is one of the following: a triangle, a portion of a circle, or a portion of an ellipse.

[0029] In some embodiments, the first reflective surface is the surface of a cone or a pyramid.

[0030] In some embodiments, the bottom of the first groove has a flat surface, and the protrusion contacts the flat surface;

[0031] Alternatively, the bottom of the first substrate has a raised structure, and the protrusion covers the raised structure; the angle between the line connecting the vertex of the raised structure to the bottom edge and the second surface is smaller than the angle between the first reflective surface and the second surface.

[0032] This disclosure provides a method for preparing a light-emitting substrate, comprising:

[0033] A first substrate is provided, and a first groove is formed on a first surface of the first substrate; the first substrate further includes a second surface opposite to the first surface, wherein the side of the second surface away from the first surface is the light-emitting side of the light-emitting substrate;

[0034] A protrusion is formed at the bottom of a first groove. In a cross section along the thickness direction of the first base, passing through the geometric center of the orthographic projection of the protrusion onto the second surface, the width of the protrusion in a first direction is a first width, which gradually increases in the direction from the first surface to the second surface. The first direction is a direction located in the cross section and parallel to the first base. The protrusion includes a first reflective surface, which is at least a portion of the surface located on the side of the protrusion away from the second surface. The first reflective surface is inclined relative to the second surface. The orthographic projection of the first reflective surface on the second surface surrounds the geometric center, or the geometric center is located inside the orthographic projection of the first reflective surface on the second surface. The first reflective surface appears in the cross section as two opposing target line segments. Both target line segments are straight lines, or both target line segments are target curves, or one of the target line segments is a straight line and the other is a target curve. The target curve has a first endpoint and a second endpoint. The distance between any point on the target curve and the straight line connecting the first endpoint and the second endpoint is less than 1 / 11 of the length of the straight line connecting the first endpoint and the second endpoint.

[0035] A light extraction structure is formed on the first surface or on the side of the first surface away from the second surface;

[0036] A light-emitting unit is provided on the side of the protrusion that is away from the first substrate.

[0037] In some embodiments, a protrusion located at the bottom of the first groove is formed within the first groove, specifically including:

[0038] Material from the base portion is filled into the first groove to form a base layer, and the base layer is patterned to form a pattern of the base portion;

[0039] A first reflective layer is formed on the side of the substrate that is away from the bottom of the first groove.

[0040] In some embodiments, after forming a protrusion located at the bottom of the first groove within the first groove, the method further includes:

[0041] The first groove is filled with a light-transmitting filling portion;

[0042] After forming the light extraction structure, the method also includes:

[0043] A second reflective layer is formed on the side of the light extraction structure and the light-transmitting filling portion that is away from the first substrate;

[0044] A second opening is formed in the second reflective layer, and a first opening is formed in the light-transmitting filling portion;

[0045] A color conversion structure shall be provided at least in the second opening and in the first opening;

[0046] Forming a flattened encapsulation layer.

[0047] In some embodiments, after forming a second reflective layer on the side of the light-extracting structure and the light-transmitting filling portion away from the first substrate, the method further includes:

[0048] A cushion layer is formed on the side of the second reflective layer away from the first substrate, and a third opening is formed in the cushion layer; the color conversion structure is also located in the third opening.

[0049] This disclosure provides a display module, including a liquid crystal display panel and a light-emitting substrate; the light-emitting substrate is a backlight panel of the liquid crystal display panel.

[0050] The liquid crystal display panel is located on the light-emitting side of the light-emitting substrate.

[0051] This disclosure provides a display device, including a display module provided in this disclosure. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 is a schematic diagram of a light-emitting substrate provided by related technologies;

[0054] Figure 2 is a schematic diagram of the structure of a light-emitting substrate provided in an embodiment of this disclosure;

[0055] Figure 3 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0056] Figure 4 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0057] Figure 5 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0058] Figure 6 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0059] Figure 7 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0060] Figure 8 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0061] Figure 9 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0062] Figure 10 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0063] Figure 11 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0064] Figure 12 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0065] Figure 13 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0066] Figure 14 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0067] Figure 15 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0068] Figure 16 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0069] Figure 17 shows the angular spectrum of a light-emitting substrate in different regions provided by related technologies;

[0070] Figure 18 shows the angular spectrum of different regions of a light-emitting substrate provided in an embodiment of this disclosure;

[0071] Figure 19 is a schematic diagram of another light-emitting substrate provided in an embodiment of this disclosure;

[0072] Figure 20 is a schematic flowchart of a method for preparing a light-emitting substrate according to an embodiment of the present disclosure;

[0073] Figure 21 is a schematic flowchart of another method for preparing a light-emitting substrate provided in an embodiment of this disclosure;

[0074] Figure 22 is a schematic flowchart of another method for preparing a light-emitting substrate provided in an embodiment of this disclosure;

[0075] Figure 23 is a schematic diagram of the structure of a display substrate provided in an embodiment of this disclosure. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0077] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0078] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual scale and are intended only to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0079] In related technologies, as shown in Figure 1, the light-emitting substrate of a backlight module includes a glass substrate 15, a second reflective layer 5, a light-transmitting filling portion 6, a third reflective layer 13, a color conversion structure 4, a dot structure 14, and a light-emitting unit 3. The glass substrate 15 has a groove, and the third reflective layer 13 covers the protrusion of the groove as a reflective bowl. The light-transmitting filling portion 6 fills the groove. The second reflective layer 5 has an opening, and the area outside the opening covers the light-transmitting filling portion 6 and the glass substrate 15. The color conversion structure 4 is located at least in the opening area of ​​the second reflective layer 5 between the light-transmitting filling portion 6 and the light-emitting unit 3. Thus, the light emitted by the light-emitting unit 3 passes through the color conversion structure 4 and then exits from the side of the glass substrate 15 away from the groove. There is no need to additionally set a quantum dot film for color conversion outside the light-emitting structure, which can reduce the thickness of the backlight module. However, as shown in Figure 1, according to the light emission situation, the light-emitting substrate is divided into a dot uniform light area B3, a direct light area B1, a reflective bowl platform area B2, and a reflective bowl arc area B4. A1 is a normal waveguide light, captured by the dotted structure 14. Its brightness is uniformly adjusted by the dotted structure 14, meaning the light reaching the dotted structure 14 in the dotted uniform light distribution area B3 can be emitted uniformly. A2 is the light directly emitted from the direct light distribution area B1; its brightness varies with the viewing angle. A3 is the light emitted directly from the groove area corresponding to the direct light distribution area B1 after reflection by the reflector bowl and then by the roof reflection formed by the second reflector layer 5; its brightness also varies with the viewing angle. A4 is the light reaching the reflector bowl platform area B2, affected by waveguide light from other adjacent periods. Because the reflector bowl platform area B is smooth, it has no light-capturing capability. A5 is the light reaching the reflector bowl arc area B4; affected by the slope of the arc surface, different light-capturing angles result in significant brightness differences at different viewing angles. Because the reflection spectra of the dot uniform light area, the direct light area, the reflector plateau area, and the reflector arc area are inconsistent, that is, the uniformity of the brightness of the light emitted from the light-emitting substrate is inconsistent, when the light-emitting substrate is used in display products, the unevenness of brightness is further amplified when users view it at a wide viewing angle, forming obvious hot spot phenomena, which seriously affects the viewing effect.

[0080] This disclosure provides a light-emitting substrate, as shown in FIG2, comprising:

[0081] The first substrate 1 includes: a first surface S1 and a second surface S2 opposite to each other, and a first groove 101 located on the first surface S1; the side of the second surface S2 facing away from the first surface S1 is the light-emitting side of the light-emitting substrate.

[0082] The protrusion 2 is located within the first groove 101; in a cross section (Figure 2 shows one such cross section) passing through the geometric center M1 of the orthographic projection of the protrusion 2 onto the second surface S2 and along the thickness direction of the first base 1, the width of the protrusion 2 in the first direction X is a first width L1, and in the direction from the first surface S1 to the second surface S2 (i.e., the Y direction in Figure 2), the first width L1 gradually increases, wherein the first direction X is the direction located in the cross section and parallel to the first base 1; the protrusion 2 includes a first reflective surface 2-1;

[0083] The light extraction structure 10 is formed in the first surface S1 or located on the side of the first surface S1 away from the second surface S2;

[0084] The light-emitting unit 3 is located on the side of the protrusion 2 away from the first base 1, and the orthographic projection of the light-emitting unit 3 on the first base 1 covers the first groove 101.

[0085] Wherein, the first reflective surface 2-1 is at least a portion of the surface located on the side of the protrusion 2 away from the second surface S2, the first reflective surface 2-1 is inclined relative to the second surface S2, and the orthographic projection of the first reflective surface 2-1 on the second surface S2 surrounds the geometric center M1, or the geometric center M1 is located inside the orthographic projection of the first reflective surface 2-1 on the second surface S2.

[0086] The first reflective surface 2-1 appears as two opposing target line segments 19 in the cross section;

[0087] As shown in Figure 2, all target line segments 19 are straight line segments 1901; or, as shown in Figure 3, all target line segments 19 are target curve segments 1902; or, as shown in Figure 4, one of the target line segments 19 is a straight line segment 1901 and the other is a target curve segment 1902.

[0088] As shown in Figures 3 and 4, the target curve segment 1902 has a first endpoint M2 and a second endpoint M3. The distance L2 between any point on the target curve segment 1902 and the straight line N1 connecting the first endpoint M2 and the second endpoint M3 is less than 1 / 11 of the length L3 of the straight line N1 connecting the first endpoint M2 and the second endpoint M3.

[0089] The light-emitting substrate provided in this embodiment has a protrusion at the bottom of the first groove, including a first reflective surface. The first reflective surface is inclined relative to the second surface. When light reaches the first reflective surface, it is reflected. Compared with the case where no protrusion is provided, the proportion of light emitted directly from the first groove can be reduced. When the light-emitting substrate is applied to a display product, it can improve the brightness uniformity when viewed from a wide viewing angle, avoid the formation of obvious hot spot phenomenon, improve the display effect, and enhance the user experience.

[0090] It should be noted that the inclination of the first reflective surface relative to the second surface means that the angle between the first reflective surface and the second surface is greater than 0° and less than 90°.

[0091] It should be noted that in some embodiments, as shown in Figure 2, the first reflective surface 2-1 is a plane inclined relative to the second surface S2, that is, the target line segment 19 is a straight line segment 1901. However, due to process deviations, in some embodiments, the first reflective surface of the protrusion may not be a flat surface, that is, the area of ​​the first reflective surface corresponding to the part of the target line segment 19 that is the target curve segment 1902 in Figures 3 and 4 is not a flat surface. Considering the process deviations, when the target curve segment 1902 satisfies the condition that "the distance L2 between any point on the target curve segment 1902 and the straight line N1 connecting the first endpoint M2 and the second endpoint M3 is less than 1 / 11 of the length L3 of the straight line N1 connecting the first endpoint M2 and the second endpoint M3", it can be approximately regarded as the first reflective surface being an inclined flat surface. This can reduce the proportion of light emitted directly from the first groove and improve the brightness uniformity when viewed from a wide angle, all of which are within the scope of protection of this disclosure.

[0092] In some embodiments, as shown in Figures 3 and 4, the target curve segment 1902 includes at least one recessed portion facing the second surface (not shown). That is, the target curve segment 1902 includes at least one arcuate segment recessed towards the second surface (not shown). Figures 3 and 4 illustrate this by taking the target curve segment 1902 as an example of an arcuate segment recessed towards the second surface (not shown). Specifically, the target curve segment 1902 is located on the side of the straight line N1 connecting the first endpoint M2 and the second endpoint M3 facing the second surface (not shown), and the tangent angle of the target curve segment 1902 gradually increases in the direction away from the second surface (not shown). Alternatively, the target curve segment may also consist of two arcuate segments recessed towards the second surface (not shown), with the tangent angle of the target curve segment first gradually increasing, then slightly decreasing, and then gradually increasing again.

[0093] It should be noted that if the arc segment bulges towards the side opposite to the second surface, the tangent tilt angle of the target curve segment will be smaller, and the light coupling angle in some areas will become smaller, which may lead to light leakage, i.e., light emanating directly from the first groove. The light-emitting substrate provided in this embodiment includes at least one arc segment that is recessed towards the second surface, which can increase the tangent tilt angle of the target curve segment, avoid the risk of light leakage, and improve the brightness uniformity when viewed from a wide angle.

[0094] Let's take an example to illustrate this. Of course, in actual implementation, the target curve segment can also be a curve segment that is concave towards the second surface.

[0095] In some embodiments, as shown in FIG2, the orthographic projection of the first reflective surface 2-1 onto the second surface S2 surrounds the geometric center M1. That is, the surface of the protrusion 2 facing away from the second surface S2 is the first reflective surface 2-1. When the target line segments 19 are all straight lines 1901, the first reflective surface 2-1 is a conical surface, that is, the first reflective surface 2-1 is the surface of a cone or a pyramid. When a portion of the target line segments 19 are target curve segments 1902, the first reflective surface 2-1 is an approximate conical surface with an arc surface, specifically, it can be an approximate conical surface with an arc surface or an approximate pyramidal surface with an arc surface. This can improve light utilization and thus improve the luminous efficiency of the light-emitting substrate.

[0096] Alternatively, due to manufacturing variations, in some embodiments, as shown in FIG3, the geometric center M1 is located inside the orthographic projection of the first reflective surface 2-1 onto the second surface (not shown); that is, the first reflective surface 2-1 is a conical surface or part of an approximately conical surface with an arcuate surface. For example, due to manufacturing variations, as shown in FIG3, the surface of the protrusion 2 facing away from the second surface (not shown) may also include a planar portion 20 connected to the first reflective surface 2-1 and parallel to the second surface (not shown). Alternatively, due to manufacturing variations, the surface of the protrusion facing away from the second surface may also include an arcuate surface connected to the first reflective surface.

[0097] In some embodiments, as shown in FIG2, the light-emitting unit 3 covers the first groove 101 by the orthogonal projection of the first substrate 1.

[0098] In some embodiments, the first substrate is used to support other structures disposed thereon. The shape and size of the first substrate are adapted to the shape and size of the display device to which it is applied. Generally, the shape of the first substrate can be square, rectangular, etc. When applied to irregularly shaped display devices, the shape of the first substrate can also be circular or other irregular shapes, without limitation. The first substrate can be made of transparent substrate materials commonly used in the display technology field. The transparent substrate material can be glass; or, the transparent substrate material can be poly(methyl methacrylate) (PMMA), also known as acrylic or plexiglass; the transparent substrate material can also be polycarbonate (PC), also known as PC plastic.

[0099] In some embodiments, as shown in FIG2, the protrusion 2 and the first base 1 are disposed independently of each other.

[0100] In some embodiments, as shown in FIG2, the bottom of the first groove 101 has a flat surface 103, and the protrusion 2 contacts the flat surface 103.

[0101] Alternatively, in some embodiments, as shown in FIG5, the bottom of the first groove 101 has a raised structure 102, and the protrusion 2 covers the raised structure 102.

[0102] In some embodiments, as shown in Figures 2 and 5, the bottom of the first groove 101 has an arcuate area 104 connected to the side surface;

[0103] In Figure 2, the area between the curved surface 104 is a flat surface 103;

[0104] In Figure 5, the area between the curved surface 104 is a raised structure 102.

[0105] In practice, the first substrate can be etched to create the first groove. Since the bottom of the first groove has an arcuate area, multiple photomasks are needed to etch it. Ideally, the bottom surface of the first groove should be flat. However, considering process variations, a protruding structure may actually appear in the central region of the first groove. For example, a protruding structure might be a structure with a pointed tip, as shown in Figure 5, composed of two different arcuate surfaces. Of course, the bottom of the first groove can also have other recessed structures, uneven structures, or other structures; this is not limited here.

[0106] In some embodiments, as shown in FIG2, the protrusion 2 includes: a base portion 201, and a first reflective layer 202 located on the side of the base portion 201 away from the second surface S2; the first reflective layer 202 has a first reflective surface 2-1.

[0107] In some embodiments, as shown in FIG2, the substrate 201 is located at the bottom of the first groove 101; the first reflective layer 202 covers the surface of the substrate 201 on the side opposite to the bottom of the first groove 101, and the surface of the substrate 201 on the side opposite to the bottom of the first groove 101 includes a first inclined surface 2-2, which is substantially parallel to the first reflective surface 2-1.

[0108] In some embodiments, as shown in FIG2, the angle between the first inclined surface 2-2 and the second surface S2 is equal to the angle between the first reflective surface 2-1 and the second surface S2.

[0109] In practical implementation, a base portion with a first inclined surface is first made, and then a first reflective layer is made on the base portion, so that the surface of the first reflective layer on the side away from the base portion also includes the inclined surface.

[0110] In some embodiments, the first reflective layer is typically a material with high reflectivity. For example, the material of the first reflective layer includes silver or aluminum.

[0111] Alternatively, in some embodiments, as shown in FIG6, the protrusion 2 is an integral structure, the material of the protrusion 2 is metal, and the metal has a first reflective surface 2-1.

[0112] In practical implementation, a metal material layer is formed in the first groove, and then the metal material layer is patterned to form a protrusion with a first reflective surface.

[0113] Alternatively, in some embodiments, as shown in FIG7, the protrusion 2 includes: a base portion 201, and a first reflective layer 202 located on the side of the base portion 201 away from the second surface S2; the first reflective layer 202 has a first reflective surface 2-1; the base portion 201 and the first substrate 1 are integral structures made of the same material, that is, a portion of the first substrate 1 located in the first groove 101 is reused as the base portion 201 of the protrusion 2.

[0114] The backlight substrate provided in this embodiment reuses a portion of the first substrate as the base portion of the protrusion, so that the base portion can be formed in the step of forming the first groove, which can simplify the process flow of the backlight substrate and save costs.

[0115] It should be noted that the first groove is formed by removing a portion of the first base on one side of the first surface. Even if a portion of the base is reused as a protruding base portion, as shown in Figure 7, the orthographic projection of the base portion 201 on the second surface S2 still falls within the orthographic projection of the first groove 101 on the second surface S2. That is, the base portion 201 can still be considered to be disposed in the first groove 101.

[0116] In some embodiments, as shown in FIG7, the first reflective layer 202 covers the surface of the substrate 201 on the side opposite to the bottom of the first groove 101. The surface of the substrate 201 on the side opposite to the bottom of the first groove 101 includes a first inclined surface 2-2, which is substantially parallel to the first reflective surface 2-1.

[0117] In some embodiments, as shown in FIG2, the light-emitting substrate further includes:

[0118] Color conversion structure 4 is located on the side of the protrusion 2 that is away from the first base 1.

[0119] In the light-emitting substrate provided in this embodiment, a color conversion structure is used to convert the color of the light emitted by the light-emitting unit to the desired color. The color conversion structure can be made of fluorescent material or quantum dot material, and is not limited thereto. For example, the light-emitting unit can be a blue LED, and the color conversion structure can be made of quantum dot material, converting the blue light emitted by the light-emitting unit into white light for backlighting. Alternatively, the light-emitting unit can be a white LED, which directly emits white light, and the color conversion structure can be made of a transparent material, allowing white light to pass through directly. The color conversion structure can also be air, and is not limited thereto.

[0120] In some embodiments, as shown in FIG2, the light-emitting substrate further includes:

[0121] The light-transmitting filling portion 6 is located in the first groove 101 on the side of the protrusion 2 away from the bottom of the first groove 101; the light-transmitting filling portion 6 includes a first opening 601 that exposes a portion of the protrusion 2, that is, the orthographic projection of the first opening 601 on the second surface S2 is located within the orthographic projection of the protrusion 2 on the second surface S2; the color conversion structure 4 is located at least within the first opening 601.

[0122] The light-emitting substrate provided in this embodiment features a color conversion structure located at least within the first opening, meaning the color conversion structure includes at least a portion located within the first groove. This allows the color conversion structure to adequately convert the color of light incident into the first substrate through the first opening, ensuring color accuracy and increasing luminous efficiency. Furthermore, the first opening exposes a portion of the protruding portion, meaning the orthographic projection of the first opening onto the second surface lies within the orthographic projection of the protruding portion onto the second surface. This prevents the color conversion structure from having a portion that does not cover the protruding portion and instead emits light directly, thus avoiding direct light exposure that could affect brightness uniformity.

[0123] In some embodiments, the absolute value of the difference between the refractive index of the light-transmitting filling portion and the refractive index of the first substrate is less than or equal to 0.2. Having a refractive index similar to that of the first substrate helps to avoid a reduction in light efficiency. For example, the absolute value of the difference between the refractive index of the light-transmitting filling portion and the refractive index of the first substrate is 0.1, 0.15, or 0.2.

[0124] To further reduce light efficiency loss, in some embodiments, the absolute value of the difference between the refractive index of the light-transmitting filling portion and the refractive index of the first substrate is less than or equal to 0.05.

[0125] The light-emitting substrate provided in this embodiment has an absolute value of the difference between the refractive index of the light-transmitting filling portion and the refractive index of the first substrate that is less than or equal to 0.05, that is, the difference in refractive index between the two is small, thereby avoiding a large difference in refractive index between the two leading to a reduction in light efficiency.

[0126] In some embodiments, the material of the light-transmitting filling portion includes at least one of the following: polyvinyl chloride (PVC), polyvinyl alcohol (PVA), polylactic acid (PLA), PMMA, polyvinyl pyrrolidone (PVP), polyethylene glycol terephthalate (PET), and PC. That is, the light-transmitting filling portion is a highly transparent material. Based on this, the material of the first substrate includes at least one of the following: glass, polymethyl methacrylate, and polycarbonate. The refractive index difference between the two is small, thereby avoiding a large difference in refractive index that would lead to a decrease in light efficiency.

[0127] In some embodiments, as shown in FIG2, the surface of the light-transmitting filling portion 6 on the side opposite to the second surface S2 is flush with the portion outside the first groove 101 of the first surface S1.

[0128] In some embodiments, as shown in FIG2, the light-emitting substrate further includes:

[0129] The second reflective layer 5 is located on the side of the light-transmitting filling portion 6 that is away from the first substrate 1; the second reflective layer 5 includes a second opening 501, the orthographic projection of the second opening 501 on the first substrate 1 coincides with the orthographic projection of the first opening 601 on the first substrate 1; the color conversion structure 4 also includes a portion located inside the second opening 501.

[0130] In the light-emitting substrate provided in this embodiment, the orthographic projection of the second opening onto the first substrate coincides with the orthographic projection of the first opening onto the first substrate. Consequently, the orthographic projection of the second reflective layer onto the first substrate overlaps with the first groove. That is, the second reflective layer has a portion located inside the first groove, which forms an eaves structure relative to the first groove. This eaves structure can be used to reflect light, improving light utilization. Furthermore, the light emitted from the light-emitting unit, after multiple reflections by the protrusion and the second reflective layer, exhibits a certain degree of diffusion and light uniformity, reducing the need for a diffusion film and further reducing the thickness of the light-emitting substrate, thus facilitating the thinning requirements of display devices.

[0131] In some embodiments, as shown in FIG2, the light-emitting substrate further includes:

[0132] The encapsulation planarization layer 9 is located on the side of the second reflective layer 5 and the color conversion structure 4 that is away from the first substrate 1; the orthographic projection of the encapsulation planarization layer 9 onto the first substrate 1 covers the orthographic projection of the second reflective layer 5 and the color conversion structure 4 onto the first substrate 1.

[0133] The light-emitting substrate provided in this embodiment also includes a planarization layer. The planarization layer can protect the film layers such as the color conversion structure, thereby reducing the risk of failure of the color conversion structure due to water and oxygen erosion. The planarization layer can be a single-layer structure or a multi-layer structure, and is not limited thereto.

[0134] In some embodiments, as shown in Figures 2, 8 to 10, the light extraction structure 10 is located on the side of the second reflective layer 5 facing the first surface S1.

[0135] In some embodiments, as shown in FIG2 and FIG8 to FIG10, the light extraction structure 10 includes a plurality of second grooves 1001; the second reflective layer 5 covers the light extraction structure 10; the orthographic projection of the light extraction structure 10 perpendicular to the first surface S1 surrounds the first groove 101; in the direction perpendicular to the first surface S1, the cross-sectional shape of the first groove 101 is one of the following: a triangle, a part of a circle, or a part of an ellipse.

[0136] The light-emitting substrate provided in this embodiment further includes a light-extracting structure having a plurality of second grooves, and a second reflective layer covers the plurality of second grooves, so that the light-extracting structure can receive light reflected by the protrusion and incident on the light-extracting structure through the first substrate, and scatter the light at the interface between the second reflective layer and the light-extracting structure, thereby further improving the uniformity of the backlight brightness of the light-emitting substrate.

[0137] Figures 2, 8, and 10 illustrate examples where the cross-sectional shape of the second groove 1001 is part of a circle, while Figure 9 illustrates an example where the cross-sectional shape of the second groove 1001 is triangular. The cross-sectional shape of the second groove 1001, i.e., the morphology of the interface between the second reflective layer and the light extraction structure, and the refractive index of the light extraction structure, affect the emission angle spectrum of the light rays emitted from the interface between the second reflective layer and the light extraction structure. In specific implementations, the cross-sectional shape of the second groove can be selected to match the required emission angle spectrum type.

[0138] Of course, in some embodiments, the cross-sectional shape of the second groove can also be trapezoidal, rectangular, or other shapes.

[0139] In some embodiments, as shown in FIG11, the orthographic projection of the second groove 1001 on the second surface S2 is dot-shaped; the orthographic projections of multiple dot-shaped second grooves 1001 on the second surface S2 surround the first groove 101. That is, the orthographic projection of the second groove 1001 on the second surface S2 can be dot-shaped. The dot-shaped second groove 1001 is characterized in that the size difference of its orthographic projection on the second surface S2 along various directions is small. For example, as shown in FIG11, the orthographic projection of the second groove 1001 on the second surface S2 can be circular; or the orthographic projection of the second groove on the second surface can also be an approximately circular ellipse, square, or approximately square polygon, etc., without limitation. In specific implementation, the depth of the second groove can be set to 1 micrometer (μm) to 15 μm, without limitation. The maximum size of the orthographic projection of the second groove on the second surface can be set to 2 μm to 30 μm, without limitation. The maximum size of the orthographic projection of the second groove on the second surface specifically refers to the size of the orthographic projection of the second groove on the second surface in the direction of the largest aperture. For example, when the orthographic projection of the second groove on the second surface is a circle, the maximum size refers to the diameter of the circle; when the orthographic projection of the second groove on the second surface is an ellipse, the maximum size refers to the length of the major axis of the ellipse; if the orthographic projection of the second groove on the second surface is a square or other polygon, the maximum size refers to the length of the longest diagonal of the polygon; and so on for other shapes of the second groove on the second surface, which will not be elaborated here. In specific implementation, the distance between the orthographic projection of any second groove on the second surface and the orthographic projection of the adjacent second groove on the second surface can be set to 1μm to 10μm, and is not limited here.

[0140] In some embodiments, as shown in FIG12, the shape of the orthographic projection of the second groove 1001 on the second surface S2 is strip-shaped. The strip-shaped second groove 1001 is characterized in that its orthographic projection on the second surface S2 has a maximum size along a certain direction and a minimum size perpendicular to that direction. For example, the shape of the orthographic projection of the second groove 1001 on the second surface S2 can be a rectangle or a polygon with a large difference between its length and width, or an ellipse or a shape with a large difference between its major axis length and minor axis length, which is not limited here.

[0141] In some embodiments, as shown in FIG13, the shape of the orthographic projection of the second groove 1001 onto the second surface S2 can be annular, and the orthographic projection of the first groove 101 onto the second surface S2 is located within the annular pattern formed by the orthographic projection of the second groove 1001 onto the second surface S2, without limitation.

[0142] In some embodiments, the shape of the orthographic projection of the second groove onto the second surface can also be other shapes, which are not limited here.

[0143] In some embodiments, as shown in Figures 2, 8, and 9, the light extraction structure 10 is located between the second reflective layer 5 and the first surface S1.

[0144] In some embodiments, the material of the light-extracting structure includes a light-transmitting organic adhesive.

[0145] Alternatively, in some embodiments, as shown in Figures 10 and 14, the first surface S1 has a plurality of second grooves 1001, that is, the first surface S1 is reused as a light extraction structure 10.

[0146] In the light-emitting substrate provided in this embodiment, the first surface is reused as a light extraction structure, thereby eliminating the need to additionally provide a light extraction structure on the first surface. This reduces the front projection thickness of the light-emitting substrate. Furthermore, by reducing the number of film layers between the first substrate and the second reflective layer, the loss of light during propagation can be reduced, which is beneficial for improving luminous efficiency.

[0147] In some embodiments, as shown in FIG2, FIG9 and FIG10, the second reflective layer 5 includes: a first reflective sublayer 5-1 and a second reflective sublayer 5-2 located on the side of the first reflective sublayer 5-1 facing away from the first surface S1.

[0148] That is, by setting up a double-layered reflective sublayer to improve the support strength of the second reflective layer.

[0149] In some embodiments, the material of the first reflective sublayer includes silver, and the material of the second reflective sublayer includes molybdenum.

[0150] In some embodiments, as shown in FIG2, FIG9, and FIG10, the second reflective sublayer 5-2 includes a first opening 501;

[0151] The first reflective sublayer 5-1 includes a fourth opening 502; the fourth opening 502 exposes the first groove 101; for example, the orthographic projection of the fourth opening 502 on the first surface S1 may coincide with the first groove 101.

[0152] Alternatively, in some embodiments, as shown in Figures 8 and 14, the second reflective layer 5 is a single layer. This can further reduce the overall thickness of the light-emitting substrate.

[0153] In some embodiments, the material of the single-layer second reflective layer includes silver.

[0154] In some embodiments, the first opening and the second opening are circular or elliptical in shape. Of course, the first opening and the second opening can also be other shapes.

[0155] In some embodiments, the included angle θq between the first reflective surface 2-1 and the second surface S2 satisfies: Here, θc can be defined as the critical angle for light emission from the first substrate 1. n is the refractive index of the first substrate 1.

[0156] In the light-emitting substrate provided in this embodiment, the light emitted from the light-emitting unit 3 undergoes color conversion through the color conversion structure 4 before entering the transparent filling portion 6 and passing through the transparent filling portion 6 to enter the protrusion 2. As shown in FIG2, when the angle between the C1 light ray that reaches the second surface S2 after being reflected by the protrusion 2 and the normal of the second surface S2 is greater than θc, the C1 light ray undergoes total internal reflection and will not exit directly from the second surface S2. When light rays < θc are incident on the first substrate 1, as shown in Figure 15, assuming the incident angle relative to the normal of the light-emitting surface is θ1, due to the setting of the reflecting unit 2, which includes a first reflecting surface 2-1, the angle between the first reflecting surface 2-1 and the light-emitting plane parallel to the second surface (not shown) is θq. Therefore, the incident angle of the incident light ray relative to the normal f2 of the first reflecting surface 2-1 is θ2 = θ1 + θq, and the reflection angle is θ3 = -θ1 - θq. At this time, the angle between its reflection angle and the normal f2 of the light-emitting surface (i.e., the second surface (not shown)) is θ4 = -θ1 - 2θq. To prevent the light ray from oscillating outwards, i.e., from reaching the light-emitting structure and exiting directly from the first substrate, the incident angle needs to satisfy: θ1 + 2θq ≥ θc. If abs(θ4) < 90°, it means the light ray will point to the upper surface of the first substrate, i.e., the first surface, and its incident angle relative to the normal of the upper surface is θ1 + 2θq. When abs(θ4) = 90°, for example, ray C1 in Figure 2, ray C1 will propagate horizontally and will not point to the first and second surfaces of the first substrate, nor will it be emitted. However, when abs(θ4) > 90°, for example, ray C2 in Figure 2, ray C2 will point to the second surface S2. Its incident angle with the normal to the second surface S2 is θ5 = π - θ1 - 2θq. To prevent ray C2 from escaping without passing through the light extraction structure 10, π - θ1 - 2θq ≥ θc is required. Therefore, θ1 and θq must satisfy: θc ≤ θ1 + 2θq ≤ π - θc, where θ1 ≤ θc. The minimum angle of θ1 is 0°, so θc ≤ 2θq ≤ π - θc. The maximum angle of θ1 approaches θc, so θc ≤ θc + 2θq ≤ π - θc. From the above formulas, we can obtain the intersection as:

[0157] That is, in the light-emitting substrate provided in this embodiment, the included angle θq between the first reflective surface 2-1 and the second surface S2 satisfies: This can prevent light emitted from the color conversion structure 4 to the protrusion 2 from bypassing the light extraction structure 10 and instead emitting directly from the second surface S2. This can improve the uniformity of the emitted light brightness of the light-emitting substrate. When the light-emitting substrate is used in display products, even when users view it at a wide viewing angle, there will be no hot spot phenomenon caused by uneven brightness, which can improve the viewing effect.

[0158] In some embodiments, when the material of the first substrate is glass, n is greater than or equal to 1.49 and less than or equal to 1.51; when the material of the first substrate is PMMA, n is greater than or equal to 1.47 and less than or equal to 1.49; when the material of the first substrate is PC, n is greater than or equal to 1.57 and less than or equal to 1.60.

[0159] In some embodiments, 39°≤θc≤43°.

[0160] In some embodiments, as shown in FIG15, the distance between the edge of the color conversion structure 4 and the edge of the protrusion 2 in the direction parallel to the second surface S2 is a first distance h1; the distance between the surface of the color conversion structure 4 facing away from the protrusion 2 and the plane containing the edge of the protrusion 2 in the direction perpendicular to the second surface (not shown) is a second distance h2; the first distance h1 and the second distance h2 satisfy: That is, the first distance h1 and the second distance h2 need to satisfy...

[0161] The light-emitting substrate provided in the embodiments of this disclosure This ensures that the color conversion structure 4 will not be emitted directly from the second surface S2 without passing through the protrusion 2 and the light extraction structure 10, and further ensures that no light is emitted directly from the second surface S2 without passing through the color conversion structure 4, thereby further improving the uniformity of the brightness of the light emitted from the light-emitting substrate.

[0162] In some embodiments, as shown in FIG5, when the bottom of the first groove 101 has a protrusion structure 102, the angle θ6 between the vertex of the protrusion structure 102 and the line connecting the bottom edge to the second surface S2 is smaller than the angle θq between the first reflective surface 2-1 and the second surface S2.

[0163] It should be noted that since light propagates through a waveguide within the first substrate, and only light rays with an angle greater than the critical angle of the first substrate can travel parallel to the waveguide, if the waveguide light encounters a protruding structure, and assuming the tangent angle of the protruding structure is θ, the angle of the light reflected from this protruding structure will be +2θ. This could potentially cause the waveguide light to be captured by the protruding structure, resulting in non-uniformity. The light-emitting substrate provided in this embodiment, where θ6 is less than θq, can avoid accidental light capture caused by the protruding structure and also prevent situations where the protrusion does not cover the protruding structure due to manufacturing process fluctuations.

[0164] In some embodiments, as shown in FIG16, the light-emitting substrate further includes:

[0165] The padding layer 12 is located between the second reflective layer 5 and the encapsulation planarization layer 9; the padding layer 12 includes a third opening 1201, the orthographic projection of the third opening 1201 on the first substrate 1 coincides with the orthographic projection of the first opening 601 on the first substrate 1; the color conversion structure 4 also includes a portion located within the third opening 1201.

[0166] It should be noted that when the second reflective layer includes a second reflective sublayer, and the material of the second reflective sublayer is molybdenum, due to process limitations, the thickness of the molybdenum reflective sublayer is usually quite thin, only about 100 nanometers. This results in the overall thickness of the areas corresponding to the second and first openings being unable to be increased. If the surface of the color conversion structure is roughly flush with the surface of the second reflective layer, it will limit the thickness of the color conversion structure, and may even fail to meet the requirements.

[0167] Furthermore, the light-emitting substrate provided in this embodiment has a padding layer between the second reflective layer and the encapsulation planarization layer, which helps to increase the total thickness of the space where the color conversion structure is set, thereby increasing the thickness of the color conversion structure and making it easier for the color conversion structure to meet the requirements. By reducing the proportion of light emitted directly from the first groove, when the light-emitting substrate is used in display products, the brightness uniformity can be improved when viewed from a wide angle, avoiding the formation of obvious hot spots, improving the display effect, and enhancing the user experience.

[0168] In some embodiments, the material of the padding layer can be selected from materials that do not easily absorb light. For example, glass, resin, or the material of the organic encapsulation layer in an OLED panel can be selected.

[0169] In some embodiments, as shown in Figures 2, 8 to 10, 14 and 16, the substrate 201 includes scattering particles 2011, at least in the region where the substrate 201 contacts the bottom of the first groove 101.

[0170] The light-emitting substrate provided in this embodiment includes scattering particles in the substrate portion, at least in the area where the substrate portion contacts the bottom of the first groove. The scattering particles have a scattering effect and can disperse light. As a result, the light incident from the side of the bottom of the first groove away from the substrate portion to the bottom of the first groove is modulated by the scattering particles, and the uniformity of the emitted light brightness at each angle is further improved, thereby improving the overall light emission uniformity of the light-emitting substrate.

[0171] In some embodiments, as shown in Figures 2, 8 to 10, 14 and 16, the material of the substrate 201 includes: a substrate 2012 and scattering particles 2011 dispersed in the substrate 2012.

[0172] Therefore, when manufacturing the substrate, the substrate film layer containing mixed scattering particles can be directly patterned to form a pattern of the substrate with a first inclined surface, without having to first form a scattering particle layer that contacts the bottom of the first groove and then form a pattern with a first inclined surface, which can reduce the manufacturing difficulty of the substrate.

[0173] In some embodiments, the mass concentration of scattering particles in the matrix is ​​greater than or equal to 20% and less than or equal to 70%.

[0174] In practical implementation, the concentration of scattering particles is related to the light emission angle spectrum of the corresponding region of the substrate. The concentration of scattering particles can be selected according to the light emission angle spectrum of the required light-emitting substrate.

[0175] The light-emitting substrate provided in this embodiment, when the protrusion is provided, has a mass concentration of scattering particles in the substrate that is greater than or equal to 20% and less than or equal to 70%, so that the light emission angular spectrum of the region corresponding to the substrate matches the angular spectrum of the region corresponding to the scattering structure, which can improve the brightness uniformity of the entire viewing angle, and the angular spectrum of the entire viewing angle has a Gaussian-like morphology, which meets the display requirements of high brightness at the positive viewing angle.

[0176] In related technologies, the light emission angle spectra of regions B1, B2, B3, and B4 of the light-emitting substrate shown in Figure 1 are illustrated in Figure 17. It can be seen that the brightness of region B1 varies greatly from different viewing angles, and the brightness uniformity of each region is poor. Taking Figure 2 as an example, different light-emitting regions of the light-emitting substrate provided in this embodiment are illustrated. Region B1 corresponds to the region where the light extraction structure 10 is located, and B6 corresponds to the region where the bottom of the first groove 101 is located. The light emission angle spectra of regions B1 and B6 of the light-emitting substrate provided in this embodiment are shown in Figure 18. Here, v1, v2, and v3 represent the light-emitting angular spectra of the B1 region corresponding to different second groove morphologies. v1 corresponds to a triangular cross-sectional shape of the second groove with a base angle of 30°. v2 and v3 correspond to triangular cross-sectional shapes of the region between the second grooves, with base angles of 22° and 30° for v2 and v3 respectively. k1, k2, and k3 represent the light-emitting angular spectra of the B6 region corresponding to different scattered particle concentrations. k1 has a scattered particle concentration of 0, while k2 and k3 have concentrations greater than 0. The scattered particle concentration of k2 is greater than that of k3. The angular spectrum of k2 achieves a Lambertian emission state with consistent brightness at all angles, while k3 achieves a Gaussian angular spectrum distribution with a sigma coefficient of 60°. Matching the angular spectra of each region on one side of the light-emitting surface (i.e., the second surface) ensures uniformity of the emitted image at any angle. For example, the angular spectrum corresponding to k3 is essentially the same as that corresponding to v3, and the backlight substrate corresponding to this spectrum can achieve uniform image quality and good brightness uniformity across different viewing angles.

[0177] In some embodiments, as shown in Figures 2, 8-10, 14, and 16, the light-emitting substrate further includes a driving circuit layer 8. The driving circuit layer 8 is formed between the package planarization layer 9 and the light-emitting unit 3. A driving circuit is formed in the driving circuit layer 8 for driving the light-emitting unit 3 to emit light. The driving circuit layer 8 includes a first pad 801, and the light-emitting unit 3 includes a second pad 301. The second pad 301 of the light-emitting unit 3 is electrically connected to the circuit in the driving circuit layer 9 through the first pad 801.

[0178] In some embodiments, as shown in Figures 2, 8-10, 14, and 16, the light-emitting substrate further includes a first encapsulation layer 7. The first encapsulation layer 7 is located on the side of the light-emitting unit 3 facing away from the first substrate 1. The first encapsulation layer 7 is disposed across its entire surface, thereby protecting the light-emitting unit 3 and other film layers. Specifically, the first encapsulation layer 7 can be made of materials with high reflectivity, such as white oil or white glue, to reflect light into the first opening, thereby improving light utilization. No specific limitations are imposed here.

[0179] The light-emitting substrate provided in the embodiments of this disclosure may also include other structures necessary to achieve specific functions. These structures can be fabricated according to actual conditions during implementation and are not limited herein. The structures of the above embodiments of this disclosure can be combined arbitrarily without conflict, and the resulting structures will not be described in detail here.

[0180] In practical implementation, the light-emitting unit is used to provide a backlight source. The light-emitting unit 3 can be a light-emitting diode (LED), a mini light-emitting diode (Mini LED), or a micro light-emitting diode (Micro LED), etc. The main difference between LEDs, Mini LEDs, and Micro LEDs lies in their size. LEDs typically have a planar dimension greater than 200 micrometers (μm), Mini LEDs typically have a planar dimension between 50 μm and 200 μm, and Micro LEDs typically have a planar dimension less than 50 μm. The light-emitting unit 3 can also be an organic light-emitting diode (OLED), etc., without limitation.

[0181] In some embodiments, as shown in Figures 2, 8-10, 14, and 16, the light-emitting unit 3, the first groove 101, the protrusion 2, the color conversion structure 4, and the light-extracting structure 10 surrounding the first groove 101 correspond one-to-one; the structure shown in Figures 2, 8-10, 14, and 16 can be regarded as a light-emitting unit 16; that is, the light-emitting unit 16 includes a light-emitting unit 3, a first groove 101 of the first substrate 1, a protrusion 2, a color conversion structure 4, and a light-extracting structure 10 surrounding the first groove 101; the light-emitting unit 16 also includes a light-transmitting filling portion 6, a second reflective layer 5, an encapsulation planarization layer 9, a padding layer 12, etc.

[0182] In some embodiments, as shown in FIG19, the light-emitting substrate includes a plurality of light-emitting units 16. That is, the light-emitting substrate includes a plurality of light-emitting units 3, a plurality of first grooves 101, a plurality of protrusions 2, a plurality of color conversion structures 4, and a plurality of light-extracting structures 10 surrounding the first grooves 101.

[0183] In some embodiments, the first substrates of multiple light-emitting units are integrally connected; or, the multiple light-emitting units are independent components, and the first substrates of each light-emitting unit are spliced ​​together to form a backlight substrate as a whole.

[0184] Based on the same inventive concept, this disclosure also provides a method for preparing a light-emitting substrate, as shown in FIG20, including:

[0185] S101. A first substrate is provided, and a first groove is formed on a first surface of the first substrate; the first substrate further includes a second surface opposite to the first surface, wherein the side of the second surface away from the first surface is the light-emitting side of the light-emitting substrate;

[0186] S102. A protrusion is formed at the bottom of the first groove. In a cross section passing through the geometric center of the orthographic projection of the protrusion onto the second surface and along the thickness direction of the first base, the width of the protrusion in the first direction is a first width, which gradually increases in the direction from the first surface to the second surface, wherein the first direction is a direction located in the cross section and parallel to the first base. The protrusion includes a first reflective surface, which is at least a portion of the surface located on the side of the protrusion away from the second surface. The first reflective surface is inclined relative to the second surface. The orthographic projection of the first reflective surface on the second surface surrounds the geometric center, or the geometric center is located inside the orthographic projection of the first reflective surface on the second surface. The first reflective surface appears in the cross section as two opposing target line segments. Both target line segments are straight lines, or both target line segments are target curves, or one of the target line segments is a straight line and the other is a target curve. The target curve has a first endpoint and a second endpoint, and the distance between any point on the target curve and the straight line connecting the first endpoint and the second endpoint is less than 1 / 11 of the length of the straight line connecting the first endpoint and the second endpoint.

[0187] S103. A light extraction structure is formed on the first surface or on the side of the first surface away from the second surface;

[0188] S104. A light-emitting unit is provided on the side of the protrusion that is away from the first substrate.

[0189] The method for preparing the light-emitting substrate provided in this embodiment has the same or similar technical effects as the light-emitting substrate provided in any of the foregoing embodiments, and will not be described in detail here.

[0190] In some embodiments, as shown in FIG21, a protrusion 2 located at the bottom of the first groove 101 is formed within the first groove 101, specifically including:

[0191] S1021. Material of the base portion 201 is filled into the first groove 101 to form a base layer 23;

[0192] S1022. The substrate layer 23 is patterned to form the pattern of the substrate part 201;

[0193] S1023. A first reflective layer 202 is formed on the side of the substrate 201 opposite to the bottom of the first groove 101.

[0194] It should be noted that Figure 21 is illustrated by taking the example of the protrusion 2 including the base portion 201 and the first reflective layer 202, and the base portion 201 being formed independently from the first substrate 1.

[0195] Alternatively, in some embodiments, a protrusion located at the bottom of the first groove is formed within the first groove, specifically including:

[0196] Metal material is filled into the first groove to form a metal layer;

[0197] The metal layer is patterned to form protrusions.

[0198] Alternatively, a portion of the first base can be reused as the base portion of the protrusion. In some embodiments, a protrusion located at the bottom of the first groove is formed within the first groove, specifically including:

[0199] The base portion is formed simultaneously with the first groove;

[0200] A first reflective layer is formed on the side of the substrate that is away from the bottom of the first groove.

[0201] In some embodiments, after forming a protrusion at the bottom of the first groove within the first groove, as shown in FIG21, the method further includes:

[0202] S201, fill the first groove 101 with the light-transmitting filling part 6;

[0203] S202, forming the light extraction structure 10;

[0204] S203. A second reflective layer 5 is formed on the side of the light extraction structure 10 and the light-transmitting filling portion 6 away from the first substrate 1.

[0205] S204, a second opening 501 is formed in the second reflective layer 5, and a first opening 601 is formed in the light-transmitting filling portion 6;

[0206] S205, A color conversion structure 4 is provided at least in the second opening 501 and the first opening 601;

[0207] S206, Forming the encapsulation planarization layer 9.

[0208] It should be noted that Figure 22 illustrates an example of forming multiple second grooves 1001 on the first surface S1 and reusing them as a light extraction structure 10. In some embodiments, if the light extraction structure does not reuse the first surface, a light extraction structure film is formed on the side of the first surface away from the second surface, and then a patterning process is performed on the film to form multiple second grooves.

[0209] It should be noted that the second reflective layer 5 in Figure 22 is illustrated by example as a single layer. In some embodiments, when the second reflective layer includes a first reflective sublayer and a second reflective sublayer, the first reflective sublayer is formed first and a fourth opening is formed in the first reflective sublayer, and then the second reflective sublayer is formed on the side of the first reflective sublayer away from the first surface.

[0210] In some embodiments, after the second reflective layer is formed on the side of the light-extracting structure and the light-transmitting filling portion away from the first substrate, the method further includes:

[0211] A cushion layer is formed on the side of the second reflective layer away from the first substrate, and a third opening is formed in the cushion layer; the color conversion structure is also located in the third opening.

[0212] In some embodiments, after forming the pad layer, a third opening, a second opening, and a first opening may be formed in sequence, followed by the formation of a color conversion structure, and then an encapsulation planarization layer may be formed on the side of the pad layer and the color conversion structure facing away from the first substrate.

[0213] In some embodiments, the method further includes forming a driving circuit on the encapsulation planarization layer. The composition of the driving circuit is described in the previous embodiment of the light-emitting substrate and will not be repeated here.

[0214] An embodiment of this disclosure provides a display module, as shown in FIG23, including a liquid crystal display panel 17 and a light-emitting substrate 16 provided in this embodiment of the disclosure; the light-emitting substrate is a backlight panel of the liquid crystal display panel 17;

[0215] The liquid crystal display panel 17 is located on the side of the first substrate 1 of the light-emitting substrate that is away from the light-emitting unit 3.

[0216] The display module provided in this embodiment has the same or similar technical effects as the light-emitting substrate provided in any of the foregoing embodiments when it is implemented, and will not be described in detail here.

[0217] In some embodiments, as shown in FIG23, the liquid crystal display panel 17 includes an array substrate 1701 and a counter substrate 1702 disposed opposite to each other, and a liquid crystal layer 1703 located between the array substrate 1701 and the counter substrate 1702.

[0218] In some embodiments, the first substrate can be reused as the substrate of the array substrate, that is, the film structure of the array substrate can be directly fabricated on the surface of the first substrate, thereby facilitating a further reduction in the thickness of the display device. Alternatively, in some embodiments, the first substrate can also be reused as the substrate of the opposing substrate, that is, the film structure of the opposing substrate can be directly fabricated on the surface of the first substrate, without limitation.

[0219] This disclosure provides a display device, including a display module provided in this disclosure.

[0220] The display device provided in this disclosure includes any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of this display device are understood by those skilled in the art and will not be described in detail here, nor should they be construed as limiting this disclosure. Implementation of this display device can refer to the embodiments of the display panel described above; repeated details will not be repeated.

[0221] In summary, the light-emitting substrate, display module, and display device provided in this disclosure have a protrusion at the bottom of the first groove, including a first reflective surface. The first reflective surface is inclined relative to the second surface. When light reaches the first reflective surface, it is reflected. Compared with the case where no protrusion is provided, the proportion of light emitted directly from the first groove can be reduced. When the light-emitting substrate is applied to a display product, it can improve the brightness uniformity when viewed from a wide viewing angle, avoid the formation of obvious hot spot phenomenon, improve the display effect, and enhance the user experience.

[0222] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0223] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include such modifications and variations.

Claims

1. A light-emitting substrate, wherein, The light-emitting substrate includes: The first substrate includes: a first surface and a second surface opposite to each other, and a first groove located on the first surface; A protrusion is located within the first groove; in a cross section passing through the geometric center of the protrusion's orthographic projection onto the second surface and along the thickness direction of the first base, the width of the protrusion in the first direction is a first width, which gradually increases in the direction from the first surface to the second surface, wherein the first direction is a direction located in the cross section and parallel to the first base; the protrusion includes a first reflective surface; The light-emitting unit is located on the side of the protrusion away from the first substrate and is used to emit light toward the first reflective layer. The light extraction structure is formed in the first surface or located on the side of the first surface away from the second surface; Wherein, the first reflective surface is at least a portion of the surface located on the side of the protrusion away from the second surface, the first reflective surface is inclined relative to the second surface, and the orthographic projection of the first reflective surface on the second surface surrounds the geometric center, or the geometric center is located inside the orthographic projection of the first reflective surface on the second surface; The first reflective surface appears as two opposing target line segments in the cross section; The target line segments are all straight line segments, or the target line segments are all target curve segments, or one of the target line segments is a straight line segment and the other is a target curve segment; the target curve segment has a first endpoint and a second endpoint, and the distance from any point on the target curve segment to the straight line connecting the first endpoint and the second endpoint is less than 1 / 11 of the length of the straight line connecting the first endpoint and the second endpoint.

2. The light-emitting substrate according to claim 1, wherein, The protrusion includes a base portion and a first reflective layer located on the side of the base portion away from the second surface, the first reflective layer having the first reflective surface, or... The protrusion is made of metal, and the metal has the first reflective surface.

3. The light-emitting substrate according to claim 1, wherein, The protrusion includes a base portion and a first reflective layer located on the side of the base portion away from the second surface, the first reflective layer having the first reflective surface, wherein the base portion and the first substrate are integral structures made of the same material.

4. The light-emitting substrate according to any one of claims 1 to 3, wherein, The angle θq between the first reflective surface and the second surface satisfies: Where 39°≤θc≤43°.

5. The light-emitting substrate according to any one of claims 1 to 4, wherein, At least in the region where the substrate contacts the bottom of the first groove, the substrate includes scattering particles.

6. The light-emitting substrate according to claim 5, wherein, The material of the substrate includes: a substrate and the scattering particles dispersed in the substrate.

7. The light-emitting substrate according to claim 5, wherein, The mass concentration of the scattering particles in the matrix is ​​greater than or equal to 20% and less than or equal to 70%.

8. The light-emitting substrate according to any one of claims 1 to 7, wherein, The light-emitting substrate further includes: A color conversion structure is located on the side of the protrusion facing away from the first substrate; in a direction parallel to the second surface, the distance between the edge of the color conversion structure and the edge of the protrusion is a first distance; in a direction perpendicular to the second surface, the distance between the surface of the color conversion structure facing away from the protrusion and the plane containing the edge of the protrusion is a second distance; the first distance h1 and the second distance h2 satisfy:

9. The light-emitting substrate according to claim 8, wherein, The light-emitting substrate further includes: A light-transmitting filling portion is located within the first groove on the side of the protrusion opposite to the bottom of the first groove; the light-transmitting filling portion includes a first opening exposing a portion of the protrusion, and the color conversion structure is located at least within the first opening.

10. The light-emitting substrate according to claim 9, wherein, The material of the light-transmitting filling portion includes at least one of the following: polyvinyl chloride, polyvinyl alcohol, polylactic acid, polymethyl methacrylate, polyvinylpyrrolidone, polyethylene terephthalate, and polycarbonate; the material of the first substrate includes at least one of the following: glass, polymethyl methacrylate, and polycarbonate.

11. The light-emitting substrate according to claim 9 or 10, wherein, The light-emitting substrate further includes: The second reflective layer is located on the side of the light-transmitting filling portion opposite to the first substrate; the second reflective layer includes a second opening, the orthographic projection of the second opening onto the first substrate coincides with the orthographic projection of the first opening onto the first substrate; the color conversion structure also includes a portion located within the second opening; An encapsulation planarization layer is located on the side of the second reflective layer and the color conversion structure that is away from the first substrate; the orthographic projection of the encapsulation planarization layer onto the first substrate covers the orthographic projection of the second reflective layer and the color conversion structure onto the first substrate.

12. The light-emitting substrate according to claim 11, wherein, The light-emitting substrate further includes: A padding layer is located between the second reflective layer and the encapsulation planarization layer; the padding layer includes a third opening, the orthographic projection of the third opening onto the first substrate coincides with the orthographic projection of the first opening onto the first substrate; the color conversion structure also includes a portion located within the third opening.

13. The light-emitting substrate according to claim 11 or 12, wherein, The light extraction structure includes a plurality of second grooves; the light extraction structure is located on the side of the second reflective layer facing the first surface; the orthographic projection of the light extraction structure perpendicular to the first surface surrounds the first groove; in the direction perpendicular to the first surface, the cross-sectional shape of the first groove is one of the following: a triangle, a portion of a circle, or a portion of an ellipse.

14. The light-emitting substrate according to any one of claims 1 to 13, wherein, The first reflective surface is the surface of a cone or a pyramid.

15. The light-emitting substrate according to any one of claims 1-2 and 4-14, wherein, The bottom of the first groove has a flat surface, and the protrusion contacts the flat surface; Alternatively, the bottom of the first base has a raised structure, and the protrusion covers the raised structure; The angle between the line connecting the vertex of the protruding structure to the bottom edge and the second surface is smaller than the angle between the first reflective surface and the second surface.

16. A method for preparing a light-emitting substrate, wherein, The method includes: A first substrate is provided, and a first groove is formed on a first surface of the first substrate; the first substrate further includes a second surface opposite to the first surface, wherein the side of the second surface away from the first surface is the light-emitting side of the light-emitting substrate; A protrusion is formed at the bottom of the first groove; in a cross section passing through the geometric center of the protrusion's orthographic projection onto the second surface and along the thickness direction of the first base, the width of the protrusion in the first direction is a first width, which gradually increases in the direction from the first surface to the second surface, wherein the first direction is a direction located in the cross section and parallel to the first base; the protrusion includes a first reflective surface, which is at least a portion of the surface located on the side of the protrusion away from the second surface, the first reflective surface being inclined relative to the second surface, and the first reflective surface in the... The orthographic projection of the first reflective surface onto the second surface surrounds the geometric center, or the geometric center is located inside the orthographic projection of the first reflective surface onto the second surface; the first reflective surface appears in the cross-section as two opposing target line segments; both target line segments are straight lines, or both target line segments are curved lines, or one of the target line segments is a straight line and the other is a curved line; the target curved line segment has a first endpoint and a second endpoint, and the distance from any point on the target curved line segment to the straight line connecting the first endpoint and the second endpoint is less than 1 / 11 of the length of the straight line connecting the first endpoint and the second endpoint; A light extraction structure is formed on the first surface or on the side of the first surface away from the second surface; A light-emitting unit is disposed on the side of the protrusion opposite to the first substrate.

17. The method according to claim 16, wherein, A protrusion is formed within the first groove, located at the bottom of the first groove, specifically including: Material from the base portion is filled into the first groove to form a base layer, and the base layer is patterned to form a pattern of the base portion; A first reflective layer is formed on the side of the substrate that is away from the bottom of the first groove.

18. The method according to claim 16 or 17, wherein, After forming a protrusion located at the bottom of the first groove within the first groove, the method further includes: The first groove is filled with a light-transmitting filling portion; After forming the light extraction structure, the method further includes: A second reflective layer is formed on the side of the light extraction structure and the light-transmitting filling portion that is away from the first substrate; A second opening is formed in the second reflective layer, and a first opening is formed in the light-transmitting filling portion; A color conversion structure is provided at least in the second opening and the first opening; Forming a flattened encapsulation layer.

19. The method according to claim 18, wherein, After forming a second reflective layer on the side of the light-extracting structure and the light-transmitting filling portion opposite to the first substrate, the method further includes: A pad layer is formed on the side of the second reflective layer opposite to the first substrate, and a third opening is formed in the pad layer; the color conversion structure is also located in the third opening.

20. A display module, wherein, It includes a liquid crystal display panel and a light-emitting substrate according to any one of claims 1 to 15; the light-emitting substrate is the backlight panel of the liquid crystal display panel; The liquid crystal display panel is located on the light-emitting side of the light-emitting substrate.

21. A display device, wherein, Includes the display module according to claim 20.

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