Display panel, manufacturing method for display panel, and display device

Abstract

The present application belongs to the technical field of display. Disclosed are a display panel, a manufacturing method for a display panel, and a display device. The display panel comprises: a substrate, a light extraction structure layer, and a display panel comprising a plurality of light-emitting units, wherein the light extraction structure layer comprises a plurality of light extraction structures, a plurality of first recessed structures recessed in the direction approaching the substrate are provided on the side of the light extraction structures away from the substrate, and at least one first recessed sub-structure recessed in the direction approaching the substrate is provided on the side of the first recessed structures away from the substrate. The light-emitting units are provided with structures similar in shape to the light extraction structures, such that the light-emitting area of the light-emitting units can be increased, thereby improving the brightness of the display panel.

Description

Display panel, method for manufacturing display panel, and display device Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel, a method for manufacturing a display panel, and a display device. Background Art

[0002] A display panel is a device that displays images.

[0003] A display panel includes a substrate and a light-emitting unit located on the substrate. The display panel is a bottom-emitting display panel, wherein the light-emitting unit is used to emit a light beam toward the substrate, so that the display panel can realize a display function.

[0004] However, the light emitting area of ​​the above-mentioned display panel is small, resulting in low brightness of the display panel.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a display panel, a method for manufacturing a display panel, and a display device. The technical solution is as follows:

[0007] According to a first aspect of the present application, a display panel is provided, comprising:

[0008] substrate;

[0009] a light extraction structure layer, the light extraction structure layer comprising a plurality of light extraction structures, the light extraction structures being located on the substrate, the light extraction structure having a plurality of first recessed structures recessed toward the substrate on a side away from the substrate, and at least one first sub-recessed structure recessed toward the substrate on a side away from the substrate;

[0010] A plurality of light-emitting units are provided on a substrate provided with the light extraction structure layer, the plurality of light-emitting units respectively correspond to the plurality of light extraction structures, and the light-emitting units cover the corresponding light extraction structures, the light-emitting units have a second recessed structure corresponding to the first recessed structure, and a second sub-recessed structure corresponding to the first sub-recessed structure, the recessed direction of the second recessed structure is the same as the recessed direction of the first recessed structure, and the orthographic projection of the second recessed structure on the substrate overlaps with the orthographic projection of the corresponding first recessed structure on the substrate, the recessed direction of the second sub-recessed structure is the same as the recessed direction of the first sub-recessed structure, and the orthographic projection of the second sub-recessed structure on the substrate overlaps with the orthographic projection of the corresponding first sub-recessed structure on the substrate.

[0011] Optionally, the plurality of light-emitting units include light-emitting units of at least three colors;

[0012] The target proportions of the first sub-recessed structure in the light extraction structure corresponding to light-emitting units of at least two different colors are different, and the target proportions are the ratio of the orthographic projection of the first sub-recessed structure on the substrate to the orthographic projection of the light extraction structure on the substrate.

[0013] Optionally, among the light-emitting units of the at least three colors, target proportions of the first sub-recess structures in the light extraction structure corresponding to light-emitting units of different colors are different.

[0014] Optionally, the target proportion of the first sub-recess structures in the light extraction structure is negatively correlated with the lifespan of the light emitting unit corresponding to the light extraction structure.

[0015] Optionally, the first recessed structure includes a first bottom and a first sidewall located on a side of the first bottom away from the substrate, and a slope angle of the first sidewall ranges from 30 degrees to 45 degrees.

[0016] Optionally, the light emitting unit includes a first portion located on the first bottom and a second portion located on the first sidewall, and a thickness of the first portion is greater than a thickness of the second portion.

[0017] Optionally, the first sub-recess structure includes a second bottom and a second sidewall located on a side of the second bottom away from the substrate, and a slope angle of the second sidewall ranges from 30 degrees to 45 degrees.

[0018] Optionally, the first recessed structure includes a first sub-recessed structure, and the geometric center of the first sub-recessed structure is located on the center line of the first recessed structure.

[0019] Optionally, the first recessed structure includes a first sub-recessed structure, and the geometric center of the first sub-recessed structure is located outside the center line of the first recessed structure.

[0020] Optionally, the first recessed structure includes two first sub-recessed structures of different sizes, and the two first sub-recessed structures are connected.

[0021] Optionally, the first recessed structure includes a plurality of first sub-recessed structures, and the plurality of first sub-recessed structures include a central sub-recessed structure and a plurality of peripheral sub-recessed structures surrounding the central sub-recessed structure.

[0022] Optionally, the first recessed structure includes a plurality of first sub-recessed structures, and the plurality of first sub-recessed structures are arranged around a center line of the first recessed structure.

[0023] Optionally, the first recessed structure has a plurality of sub-regions on a side away from the substrate, wherein the sub-regions are regions with monotonic slope angles in a direction perpendicular to the substrate, and the plurality of sub-regions satisfy:

[0024] Wherein, k is the number of the multiple sub-regions, d is the size of the sub-region in the direction perpendicular to the substrate, θ is the angle between the line connecting the two endpoints of the sub-region and the substrate, the two endpoints are respectively the point in the sub-region farthest from the substrate and the point closest to the substrate, and D1 is the size of the first recessed structure in the direction parallel to the substrate.

[0025] Optionally, an angle θ between a line connecting two endpoints of the sub-region and the substrate is in a range of 30 degrees to 45 degrees.

[0026] Optionally, the first recessed structure and the first sub-recessed structure include curved recessed structures or trapezoidal recessed structures, and the cross-section of the trapezoidal recessed structure in a direction perpendicular to the substrate is trapezoidal.

[0027] Optionally, a size of the first recessed structure in a direction parallel to the substrate ranges from 3 micrometers to 10 micrometers.

[0028] Optionally, a size of the first sub-recess structure in a direction parallel to the substrate is greater than or equal to 2 microns.

[0029] In another aspect, a method for manufacturing a display panel is provided, the method comprising:

[0030] Obtaining a substrate;

[0031] A light extraction structure layer is formed on the substrate, wherein the light extraction structure layer includes a plurality of light extraction structures. The light extraction structures are located on the substrate, and a surface of the light extraction structure away from the substrate has a plurality of first recessed structures recessed toward the substrate. The surface of the first recessed structure away from the substrate has at least one first sub-recessed structure recessed toward the substrate.

[0032] A plurality of light-emitting units are formed on a substrate on which the light extraction structure is formed, the plurality of light-emitting units corresponding to the plurality of light extraction structures, and the light-emitting units cover the corresponding light extraction structures, the light-emitting units being used to emit light beams in a direction toward the substrate, the light-emitting unit having a second recessed structure corresponding to the first recessed structure, and a second sub-recessed structure corresponding to the first sub-recessed structure, the recessed direction of the second recessed structure being the same as the recessed direction of the first recessed structure, and the orthographic projection of the second recessed structure on the substrate overlapping with the orthographic projection of the first recessed structure on the substrate, the recessed direction of the second sub-recessed structure being the same as the recessed direction of the first sub-recessed structure, and the orthographic projection of the second sub-recessed structure on the substrate overlapping with the orthographic projection of the first sub-recessed structure on the substrate.

[0033] Optionally, forming a light extraction structure layer on the substrate includes:

[0034] forming a light extraction structural material layer on the substrate;

[0035] forming a plurality of first recessed structures that are recessed toward a direction close to the substrate on a side of the light extraction structure material layer away from the substrate through an exposure and development process;

[0036] forming at least one first sub-recessed structure recessed toward a direction close to the substrate by a photocuring process;

[0037] A light extraction structure layer is formed through a baking process.

[0038] On the other hand, a display device is provided, comprising a power supply component and any one of the above-mentioned display panels.

[0039] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0040] A display panel is provided, comprising a substrate, a light extraction structure layer, and a plurality of light-emitting units. The light extraction structure layer includes multiple light extraction structures. The light extraction structure has multiple first recessed structures recessed toward the substrate on its side facing away from the substrate, and at least one first sub-recessed structure recessed toward the substrate on its side facing away from the substrate. The light-emitting units also have structures similar in shape to the light extraction structures, thereby increasing their luminous area and improving the brightness of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] FIG1 is a schematic diagram of a top view of a display panel provided in an embodiment of the present application;

[0043] FIG2 is a schematic cross-sectional view of the display panel provided in FIG1 ;

[0044] FIG3 is an enlarged structural diagram of the display panel provided in FIG1 ;

[0045] FIG4 is a schematic cross-sectional view of another display panel provided in an embodiment of the present application;

[0046] FIG5 is a schematic cross-sectional view of another display panel provided in an embodiment of the present application;

[0047] FIG6 is a schematic diagram of a top view of the display panel provided in FIG5 ;

[0048] FIG7 is a schematic cross-sectional view of another display panel provided in an embodiment of the present application;

[0049] FIG8 is a schematic diagram of a top view of the display panel provided in FIG7 ;

[0050] FIG9 is a schematic cross-sectional view of a partial structure of another display panel provided in an embodiment of the present application;

[0051] FIG10 is a schematic cross-sectional view of a light extraction structure provided by the related art;

[0052] FIG11 is a schematic cross-sectional view of a partial structure of another display panel provided in an embodiment of the present application;

[0053] FIG12 is a schematic cross-sectional view of another light extraction structure provided in an embodiment of the present application;

[0054] FIG13 is a schematic cross-sectional view of another light extraction structure provided in an embodiment of the present application;

[0055] FIG14 is a schematic cross-sectional view of another light extraction structure provided in an embodiment of the present application;

[0056] FIG15 is a schematic cross-sectional view of another light extraction structure provided in an embodiment of the present application;

[0057] FIG16 is a schematic cross-sectional view of another light extraction structure provided in an embodiment of the present application;

[0058] FIG17 is a schematic cross-sectional view of a partial structure of another display panel provided in an embodiment of the present application;

[0059] FIG18 is a schematic cross-sectional view of another display panel provided in an embodiment of the present application;

[0060] FIG19 is a flow chart of a method for manufacturing a display panel according to an embodiment of the present application;

[0061] FIG20 is a flow chart of another method for manufacturing a display panel provided in an embodiment of the present application;

[0062] FIG21 is a schematic diagram of a preparation process of a first sub-recess structure provided by the present application;

[0063] FIG22 is a flow chart of another method for manufacturing a display panel provided in an embodiment of the present application;

[0064] FIG23 is a schematic diagram of a preparation process of another first sub-recess structure provided by the present application;

[0065] FIG24 is a schematic cross-sectional view of a hard mask provided in the present application;

[0066] FIG25 is a schematic diagram of the cross-sectional structure of another hard mask provided in the present application.

[0067] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0068] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0069] An embodiment of the present application provides a display panel. Please refer to Figures 1, 2, and 3. Figure 1 is a schematic diagram of a top view of a display panel provided in an embodiment of the present application. Figure 2 is a schematic diagram of a cross-sectional structure of the display panel provided in Figure 1 (Figure 2 may be a schematic diagram of a cross-sectional structure of the display panel provided in Figure 1 taken at H1-H1). Figure 3 is an enlarged schematic diagram of the structure of the display panel provided in Figure 1 (Figure 3 may be an enlarged schematic diagram of the structure of a region corresponding to a light-emitting unit in the display panel provided in Figure 1). The display panel 10 includes:

[0070] Substrate 11.

[0071] The light extraction structure layer 12 includes a plurality of light extraction structures 121. The light extraction structure 121 is located on the substrate 11. The side of the light extraction structure 121 away from the substrate 11 has a plurality of first recessed structures A1 recessed in a direction Y close to the substrate 11. The first recessed structure A1 has at least one first sub-recessed structure B1 recessed in a direction close to the substrate on the side away from the substrate.

[0072] Multiple light-emitting units 13 are located on a substrate having a light extraction structure layer 12. The multiple light-emitting units 13 correspond to the multiple light extraction structures 121, and the light-emitting units 13 cover the corresponding light extraction structures 121. The light-emitting units 13 have a second recessed structure A2 corresponding to the first recessed structure A1, and a second sub-recessed structure B2 corresponding to the first sub-recessed structure B1. The recessed direction of the second recessed structure A2 is the same as the recessed direction of the first recessed structure A1, and the orthographic projection of the second recessed structure A2 on the substrate 11 overlaps with the orthographic projection of the corresponding first recessed structure A1 on the substrate 11. The recessed direction of the second sub-recessed structure B2 is the same as the recessed direction of the first sub-recessed structure B1, and the orthographic projection of the second sub-recessed structure B2 on the substrate 11 overlaps with the orthographic projection of the corresponding first sub-recessed structure B1 on the substrate 11. Because the material of each film layer in the light-emitting unit 13 is flexible, a structure with a shape similar to the light extraction structure 121 can be formed on the light-emitting unit 13.

[0073] It should be noted that Figures 2 and 3 show the situation where the first recessed structure A1 has a first sub-recessed structure B1 recessed toward the direction close to the substrate on the side away from the substrate. There are other situations in the display panel provided in the embodiment of the present application, such as the situation where the first recessed structure A1 has two, three or four first sub-recessed structures B1 recessed toward the direction close to the substrate on the side away from the substrate.

[0074] In summary, the embodiments of the present application provide a display panel comprising a substrate, a light extraction structure layer, and a plurality of light-emitting units. The light extraction structure layer includes a plurality of light extraction structures. The light extraction structure has a plurality of first recessed structures recessed toward the substrate on its side facing away from the substrate, and at least one first sub-recessed structure recessed toward the substrate on its side facing away from the substrate. Furthermore, the light-emitting units have structures similar in shape to the light extraction structures, thereby increasing the light-emitting area of ​​the light-emitting units and thereby improving the brightness of the display panel.

[0075] The display panel provided in the embodiment of the present application can be an organic light emitting diode (OLED) display panel. Referring to Figures 1, 2, and 3, the light emitting unit 13 can optionally emit a light beam toward the substrate 11. That is, the display panel 10 provided in the embodiment of the present application can be bottom-emitting. Because large-sized display panels have larger pixel areas, there is ample space for arranging thin-film transistors and wires, which can reduce the impact of these thin-film transistors and wires on the brightness of the display panel. Thus, bottom-emitting light can be applied to large-sized, high-resolution OLED display panels.

[0076] The substrate 11 can be used to support other film layers in the display panel 10 to improve the flatness of the other film layers. Optionally, the display panel 10 provided in the embodiment of the present application can be a bottom-emitting light-emitting type. Accordingly, the substrate 11 can be a light-transmitting substrate, and the light-emitting unit 13 is used to emit a light beam in a direction Y toward the substrate 11. Exemplarily, the material of the substrate 11 can include various light-transmitting materials such as glass.

[0077] The light extraction structure layer 12 includes a light extraction structure 131 corresponding to the light-emitting unit 13. In the area outside the light extraction structure 121, the light extraction structure layer 12 includes a flat structure 122. The surface of the flat structure 122 on the side away from the substrate 13 can be parallel to the substrate 11, and the flat structure 122 can play a flattening role. The material of the light extraction structure layer 12 can include a resin material.

[0078] The light-emitting unit 13 can be used to emit a light beam toward the substrate 11, so that the display panel 10 can realize the display function. Please refer to Figure 4, which is a schematic cross-sectional structure diagram of another display panel provided in an embodiment of the present application. In particular, the light-emitting unit 13 may include a first electrode 131, a light-emitting layer 132, and a second electrode 133. The first electrode 131 and the second electrode 133 cooperate to drive the light-emitting layer 132 to emit light. In particular, the first electrode 131 may be an anode. For example, the material of the first electrode 131 may include indium tin oxide (ITO). The second electrode 133 may be a cathode. The light-emitting layer 132 may be an organic electroluminescent layer. The first electrode 131, the light-emitting layer 132, and the second electrode 133 may each have a recessed structure similar in shape to the light extraction structure 121. As a result, the light-emitting unit 13 has a second recessed structure A2 corresponding to the first recessed structure A1, and a second sub-recessed structure B2 corresponding to the first sub-recessed structure B1. This can increase the light-emitting area of ​​the light-emitting layer 132, thereby improving the brightness of the display panel 10. For example, the manufacturing process of the first electrode 131 , the light emitting layer 132 and the second electrode 133 may include an evaporation process.

[0079] Furthermore, because the first recessed structure A1 and the first sub-recessed structure B1 of the light extraction structure 121 have inclined sidewalls, the thickness of the first electrode 131, the light-emitting layer 132, and the second electrode 133 formed on the sidewalls of the light extraction structure 121 away from the substrate 11 can be reduced. When the light-emitting layer 132 is thinner, the distance traveled by the holes provided by the first electrode 131 and the electrons provided by the second electrode 133 becomes shorter, making it easier for the electrons and holes to meet and recombine in the light-emitting layer 132 to emit light. Therefore, the main light-emitting area of ​​the light-emitting layer 132 is concentrated at the thinner portion of the film, meaning that current easily flows to the light-emitting layer 132 at the sidewalls. This increases the light-emitting area of ​​the display panel and reduces the current density of the display panel, thereby reducing the decay rate of the display panel and thereby increasing the life of the display panel.

[0080] In addition, among the light emitted by the light-emitting unit 13 of the display panel 10, the light whose exit angle is greater than the critical angle of total reflection between the substrate 11 and the air will be reflected back into the display panel 10 and cannot be emitted. The refractive index of the light extraction structure layer 12 can be smaller than the refractive index of the first electrode 131, so that the light emitted from the light-emitting layer 132 can be reflected when passing through the first recessed structure A1 and the first sub-recessed structure B1, thereby changing the path of the light. The refractive index of the light extraction structure layer 12 can range from 1.5 to 1.6. For example, the refractive index of the light extraction structure layer 12 can be 1.5. After the light is reflected multiple times by the light extraction structure layer 12, the incident angle of the light at the interface between the substrate 11 and the air can be made smaller than the critical angle of total reflection between the substrate 11 and the air, that is, the light will not be totally reflected at the interface between the substrate 11 and the air. Therefore, the light extraction structure 121 can reduce the light confined in the display panel 10, thereby improving the light extraction efficiency of the display panel 10.

[0081] In an exemplary embodiment, the plurality of light-emitting units include light-emitting units of at least three colors. For example, the plurality of light-emitting units may include light-emitting units of three colors. Referring to Figures 5 and 6, Figure 5 is a schematic cross-sectional view of another display panel provided in an embodiment of the present application, and Figure 6 is a schematic top-down view of the display panel provided in Figure 5 (to clearly illustrate the light extraction structure, Figure 6 does not show the specific light-emitting units). The display panel 10 includes a substrate 11, a light extraction structure layer 12, and a plurality of light-emitting units 13. The plurality of light-emitting units 13 include light-emitting units of three colors: a first light-emitting unit C1, a second light-emitting unit C2, and a third light-emitting unit C3. The first light-emitting unit C1 may be a red light-emitting unit, the second light-emitting unit C2 may be a green light-emitting unit, and the third light-emitting unit C3 may be a blue light-emitting unit. Furthermore, the top-down shapes of the first recessed structure A1 and the first sub-recessed structure B1 shown in Figure 6 are circular. However, the top-down shapes of the first recessed structure A1 and the first sub-recessed structure B1 may also be elliptical or polygonal, and are not limited in this embodiment of the present application.

[0082] Optionally, among the light-emitting units of at least three colors, the target proportions of the first sub-recessed structure in the light extraction structure corresponding to the light-emitting units of at least two different colors are different, and the target proportion is the ratio of the orthographic projection of the first sub-recessed structure on the substrate to the orthographic projection of the light extraction structure on the substrate. For example, among the light-emitting units of at least three colors, there may be a situation where the target proportions of the first sub-recessed structure in the light extraction structure corresponding to any two different colors of light-emitting units are different. In the embodiment of the present application, there may also be a situation where the target proportions of the first sub-recessed structure in the light extraction structure corresponding to light-emitting units of more than two different colors are different. Since the lifespans of light-emitting materials of different colors are different, the lifespans of light-emitting units of different colors are also different, and increasing the target proportion of the first sub-recessed structure can increase the light-emitting area of ​​the corresponding light-emitting unit. Based on this, in the embodiment of the present application, the target proportion of the first sub-recessed structure can be adjusted according to the lifespans of light-emitting units of different colors to improve the uniformity of the lifespans of light-emitting units of different colors in the display panel.

[0083] Optionally, the target proportions of the first sub-recessed structure in the light extraction structure corresponding to light-emitting units of different colors can be different. For example, in the three-color light-emitting units 13 shown in FIG6 , the target proportion of the first sub-recessed structure B1 in the light extraction structure 121 corresponding to the first light-emitting unit C1 is W1, the target proportion of the first sub-recessed structure B1 in the light extraction structure 121 corresponding to the second light-emitting unit C2 is W2, and the target proportion of the first sub-recessed structure B1 in the light extraction structure 121 corresponding to the third light-emitting unit C3 is W3, with W1, W2, and W3 being different values.

[0084] Optionally, the target proportion of the first sub-recessed structure B1 in the light extraction structure 121 is negatively correlated with the lifespan of the light emitting unit 13 corresponding to the light extraction structure 121, that is, the longer the lifespan of the light emitting unit 13 corresponding to the light extraction structure 121, the smaller the target proportion of the first sub-recessed structure B1 in the light extraction structure 121, and the shorter the lifespan of the light emitting unit 13 corresponding to the light extraction structure 121, the larger the target proportion of the first sub-recessed structure B1 in the light extraction structure 121. For example, among the light-emitting units 13 of multiple colors, since the lifespan of the first light-emitting unit C1 is greater than the lifespan of the second light-emitting unit C2 and the lifespan of the third light-emitting unit C3, the target proportion of the first sub-recessed structure B1 in the light extraction structure 121 corresponding to the light-emitting units 13 of multiple colors can satisfy: W1<W2<W3, thereby improving the uniformity of the lifespan of the light-emitting units 13 of different colors in the display panel 10. Since the light-emitting units 13 with low lifespan are prone to color deviation and low luminous efficiency during use, the problem of color deviation and inconsistent luminous efficiency of the light-emitting units 13 of multiple colors due to inconsistent lifespan can be avoided, thereby improving the display effect of the display panel 10.

[0085] The target proportion can be related to the size and number of the first sub-recessed structures B1. For example, for the case where the top-view structure of the first recessed structure A1 and the first sub-recessed structure B1 shown in FIG6 is circular, the target proportion of the first sub-recessed structures B1 in the light extraction structure 121 corresponding to the light-emitting units 13 of various colors can be determined based on the diameter of the first sub-recessed structure B1. The larger the diameter of the first sub-recessed structure B1 and the larger the size of the first sub-recessed structure B1, the larger the target proportion, that is, W1 < W2 < W3.

[0086] The above is a case where the multiple light-emitting units include light-emitting units of three colors. The multiple light-emitting units provided in the embodiment of the present application can also include light-emitting units of more than three colors. Exemplarily, the multiple light-emitting units include light-emitting units of four colors: red light-emitting units, green light-emitting units, blue light-emitting units, and white light-emitting units. Among them, the white light-emitting units can increase the brightness of the display panel, thereby improving the display effect of the display panel. In the case where the multiple light-emitting units include light-emitting units of more than three colors, it is also possible to meet the different target proportions of the first sub-recessed structure in the light extraction structure corresponding to the light-emitting units of different colors, so as to improve the uniformity of the lifespan of the light-emitting units of different colors in the display panel.

[0087] In addition, when the lifespans of light-emitting units of different colors are close, the target proportions of the first sub-recessed structures in the light extraction structures corresponding to the light-emitting units may also be the same. Please refer to Figures 7 and 8, Figure 7 is a schematic diagram of the cross-sectional structure of another display panel provided in an embodiment of the present application, and Figure 8 is a schematic diagram of a top view of the display panel provided in Figure 7 (in order to clearly illustrate the light extraction structure, Figure 8 does not show the specific light-emitting units). The display panel 10 includes: a substrate 11, a light extraction structure layer 12, and a plurality of light-emitting units 13. Among them, the plurality of light-emitting units 13 include light-emitting units of four colors: a first light-emitting unit C1, a second light-emitting unit C2, a third light-emitting unit C3, and a fourth light-emitting unit C4. Among them, the lifespan of the first light-emitting unit C1 is close to that of the fourth light-emitting unit C4, and the target proportion W1 of the first sub-recessed structure B1 in the light extraction structure 121 corresponding to the first light-emitting unit C1 can be equal to the target proportion W4 of the first sub-recessed structure B1 in the light extraction structure 121 corresponding to the fourth light-emitting unit C4. In this way, the uniformity of the lifespan of the light-emitting units 13 of different colors in the display panel 10 can also be improved. Since the light-emitting units 13 with a short lifespan are prone to color deviation and low luminous efficiency during use, the problem of color deviation and inconsistent luminous efficiency of the light-emitting units 13 of multiple colors due to inconsistent lifespan can be avoided, thereby improving the display effect of the display panel 10.

[0088] In the embodiments of the present application, the light extraction structure includes various structures, wherein the shapes of the first recessed structure and the first sub-recessed structure can vary. For example, the first recessed structure and the first sub-recessed structure can include curved recessed structures. Please refer to FIG9 , which is a schematic cross-sectional view of a portion of the structure of another display panel provided in the embodiments of the present application. The first recessed structure A1 includes a first bottom E1 and a first sidewall E2 located on the side of the first bottom E1 away from the substrate. The slope angle α1 of the first sidewall E2 ranges from 30 degrees to 45 degrees. The first sub-recessed structure B1 includes a second bottom E3 and a second sidewall E4 located on the side of the second bottom E3 away from the substrate. The slope angle α2 of the second sidewall E4 ranges from 30 degrees to 45 degrees. For the curved recessed structure shown in FIG9 , the slope angle can be the angle between the tangent plane of the curve and the upper surface of the substrate. In the curved recessed structure, the slope angle varies at each location, and the slope angle at each location on the first sidewall E2 ranges from 30 degrees to 45 degrees.

[0089] Because the film layers in the light-emitting unit 13 can be formed using an evaporation process, the thickness of the film layers in the light-emitting unit 13 at the sidewall locations is relatively small. By limiting the slope angle α1 of the first sidewall E2 and the slope angle α2 of the second sidewall E4 to greater than 30 degrees, the thickness of the film layers in the light-emitting unit 13 at the first sidewall E3 and the thickness at the second sidewall E4 can be reduced. The film layers in the light-emitting unit 13 may include a light-emitting layer, and the primary light-emitting region of the light-emitting layer is concentrated at locations where the film layer is thinner. That is, current tends to flow to the thickness at the first sidewall E3 and the light-emitting layer at the second sidewall E4, thereby increasing the light-emitting area of ​​the display panel. This reduces the current density required to achieve the desired brightness of the display panel, thereby reducing the brightness decay rate of the display panel and thereby improving the lifespan of the display panel. In addition, by limiting the slope angles α1 of the first sidewall E3 and the slope angles α2 of the second sidewall E4 to less than 45 degrees, it is possible to avoid the problem of film breakage or discontinuity during the formation of the film layers in the light-emitting unit 13 caused by excessively large slope angles α1 and α2.

[0090] Optionally, the light-emitting unit 13 includes a first portion J1 located on the first base E1 and a second portion J2 located on the first sidewall E2, with the first portion J1 having a thickness greater than that of the second portion J2. The thicknesses of the first portion J1 and the second portion J2 may respectively be the thicknesses of the light-emitting unit 13 in that portion in a direction perpendicular to the contact surface. Furthermore, the light-emitting unit 13 may further include a third portion J3 located on the second base E3 and a fourth portion J4 located on the second sidewall E4, with the third portion J3 having a thickness greater than that of the fourth portion J4. Because the film layers in the light-emitting unit 13 can be formed using an evaporation process, the second portion J2 on the first sidewall E2 and the fourth portion J4 on the second sidewall E4 are relatively thin. Because current tends to flow to locations where the film layers are thinner, namely, the second portion J2 on the first sidewall E2 and the fourth portion J4 on the second sidewall E4, the primary light-emitting area of ​​the light-emitting unit 13 is concentrated in the second portion J2 on the first sidewall E2 and the fourth portion J4 on the second sidewall E4.

[0091] In addition, please refer to Figure 10, which is a schematic cross-sectional view of a light extraction structure provided by related art. This light extraction structure 121 includes only the first recessed structure A1. Compared to the light extraction structure shown in Figure 10, the first sub-recessed structure B1 shown in Figure 9 can occupy the area of ​​the first bottom E1 of the first recessed structure A1, thereby increasing the area of ​​the sidewalls of the light extraction structure 121. The film layer of the light-emitting unit 13 is thinner at the sidewalls, which can serve as the primary light-emitting area, thereby increasing the effective light-emitting area of ​​the display panel.

[0092] The above is a case where the first recessed structure and the first sub-recessed structure can include a curved recessed structure. The first recessed structure and the first sub-recessed structure can also include a trapezoidal recessed structure, wherein the cross-section of the trapezoidal recessed structure in the direction perpendicular to the substrate is a trapezoidal shape. Please refer to Figure 11, which is a schematic cross-sectional structure diagram of a partial structure of another display panel provided in an embodiment of the present application. Among them, the first recessed structure A1 includes a first bottom E1 and a first sidewall E2 located on the side of the first bottom E1 away from the substrate. The slope angle α1 of the first sidewall E2 ranges from 30 degrees to 45 degrees. The first sub-recessed structure B1 includes a second bottom E3 and a second sidewall E4 located on the side of the second bottom E3 away from the substrate. The slope angle α2 of the second sidewall E4 ranges from 30 degrees to 45 degrees. For the trapezoidal recessed structure shown in Figure 11, the slope angle can be the angle between the surface on which the sidewall is located and the upper surface of the substrate. In the trapezoidal recessed structure, the slope angle value of each point on the first sidewall E2 is the same. The trapezoidal recessed structure can also increase the effective luminous area of ​​the display panel, and by limiting the range of the slope angle α1 of the first side wall E2 and the slope angle α2 of the second side wall E4, the luminous area of ​​the display panel can be increased and the current density of the display panel can be reduced, thereby improving the life of the display panel.

[0093] In the embodiments of the present application, the light extraction structure includes various configurations, wherein the number of first sub-recess structures and the location of the first sub-recess structures on the side of the first recess structure facing away from the substrate also vary. For example, referring to FIG9 , the first recess structure A1 includes a first sub-recess structure B1, and the geometric center F of the first sub-recess structure B1 is located on the centerline L of the first recess structure A1. Furthermore, in addition to the configuration shown in FIG9 , the first sub-recess structure B1 may also merely intersect the centerline L of the first recess structure A1, and this is not a limitation in the embodiments of the present application.

[0094] Alternatively, please refer to FIG12, which is a schematic cross-sectional view of another light extraction structure provided in an embodiment of the present application. The first recessed structure A1 includes a first sub-recessed structure B1, and the geometric center F of the first sub-recessed structure B1 is located outside the centerline L of the first recessed structure A1. Furthermore, FIG11 illustrates a case where the entire first sub-recessed structure B1 is located outside the centerline L. Another embodiment of the light extraction structure provided in an embodiment of the present application also exists. Please refer to FIG13, which is a schematic cross-sectional view of another light extraction structure provided in an embodiment of the present application. In this case, the first sub-recessed structure B1 may intersect the centerline L of the first recessed structure A1, and the geometric center F of the first sub-recessed structure B1 is located outside the centerline L of the first recessed structure A1. By locating the geometric center F of the first sub-recessed structure B1 outside the centerline L of the first recessed structure A1, the first recessed structure A1 can be asymmetrical on both sides of the centerline L, thereby reducing scattering of light emitted by the light-emitting unit and thereby avoiding the problem of rainbow patterns on the display panel.

[0095] Alternatively, please refer to Figure 14, which is a schematic cross-sectional view of another light extraction structure provided in an embodiment of the present application. The first recessed structure A1 includes two first sub-recessed structures B1 of different sizes, which are connected. In the light extraction structure 121 shown in Figure 14, the first recessed structures A1 are asymmetrical on either side of the centerline L, thereby preventing rainbow patterns on the display panel.

[0096] Alternatively, please refer to Figure 15, which is a schematic cross-sectional view of another light extraction structure provided in an embodiment of the present application. The first recessed structure A1 includes multiple first sub-recessed structures B1, each of which includes a central sub-recessed structure B11 and multiple peripheral sub-recessed structures B12 surrounding the central sub-recessed structure B11. Furthermore, Figure 12 illustrates the case where the geometric center F of the central sub-recessed structure B11 is located on the centerline L of the first recessed structure A1. The geometric center F of the central sub-recessed structure B11 provided in the embodiment of the present application may also be located outside the centerline L of the first recessed structure A1, and this is not a limitation of the present embodiment.

[0097] Alternatively, please refer to FIG16 , which is a schematic cross-sectional view of another light extraction structure provided in an embodiment of the present application. The first recessed structure A1 includes a plurality of first sub-recessed structures B1, which are arranged around the centerline L of the first recessed structure A1. FIG16 illustrates a case where four first sub-recessed structures B1 are arranged around the centerline L of the first recessed structure A1. The embodiment of the present application also provides other possible numbers of first sub-recessed structures B1, such as two, three, or five first sub-recessed structures B1 arranged around the centerline L of the first recessed structure A1, and the embodiment of the present application does not limit this.

[0098] In an exemplary embodiment, please refer to FIG17, which is a schematic cross-sectional structure diagram of a partial structure of another display panel provided in an embodiment of the present application. The first recessed structure A1 has a plurality of sub-regions on a surface away from the substrate 11. The plurality of sub-regions include a first sub-region G1, a second sub-region G2, a third sub-region G3, and a fourth sub-region G4. The sub-regions are regions with a slope angle that is monotonic in a direction perpendicular to the substrate 11. The plurality of sub-regions satisfy the following conditions:

[0099] Wherein, k is the number of the plurality of sub-regions, d is the size of the sub-region in the direction Y perpendicular to the substrate 11, θ is the angle between the line connecting the two endpoints of the sub-region and the substrate, the two endpoints being the point in the sub-region farthest from the substrate 11 and the point closest to the substrate 11, D1 is the size of the first recessed structure A1 in the direction Y parallel to the substrate 11, i is the i-th sub-region in the plurality of sub-regions, d i It can be the size of the i-th sub-region in the direction Y perpendicular to the substrate 11, θ i It can be the angle between the line connecting the two endpoints of the i-th sub-region and the substrate. Based on the above formula, the relationship between the first recessed structure A1 and the first sub-recessed structure B1 can be determined. That is, the larger the dimension D1 of the first recessed structure A1 in the direction parallel to the substrate 11, the larger the dimension d of the sub-region in the direction perpendicular to the substrate 11. Therefore, the dimension D2 of the first sub-recessed structure B1 in the direction parallel to the substrate 11 can be larger.

[0100] Optionally, the angle θ between the line connecting the two endpoints of the sub-region and the substrate is in the range of 30 to 45 degrees. When the angle θ is within this range, the slope angle of the sub-region is approximately in the range of 30 to 45 degrees, thereby increasing the light-emitting area of ​​the display panel and reducing the current density of the display panel, thereby improving the life of the display panel.

[0101] Optionally, the dimension D1 of the first recessed structure A1 in a direction parallel to the substrate 11 ranges from 3 microns to 10 microns. By ensuring that the dimension D1 of the first recessed structure A1 is within this range, the first sub-recessed structure B1 can be easily manufactured. In addition, the dimension D1 of the first recessed structure A1 in a direction parallel to the substrate 11 can also be related to the number of first sub-recessed structures B1 in the first recessed structure A1. The fewer the number of first sub-recessed structures B1 in the first recessed structure A1, the smaller the dimension D1 of the first recessed structure A1 in a direction parallel to the substrate 11 can be. For example, since the number of first sub-recessed structures B1 in the first recessed structure A1 shown in FIG9 is smaller than the number of first sub-recessed structures B1 in the first recessed structure A1 shown in FIG14 to FIG16, the dimension of the first recessed structure A1 in the light extraction structure 121 shown in FIG9 can be smaller than the dimension of the first recessed structure A1 in the light extraction structure 121 shown in FIG14 to FIG16. Considering the process precision, the size D1 of the first recessed structure A1 in the light extraction structure 121 shown in FIG9 may be in the range of 3 μm to 6 μm. Within this range, the first sub-recessed structure B1 may be manufactured.

[0102] Optionally, the dimension D2 of the first sub-recessed structure B1 in a direction parallel to the substrate 11 may be greater than or equal to 2 microns. By ensuring that the dimension D2 of the first sub-recessed structure B1 is within this range for the sake of process precision, the first sub-recessed structure B1 can effectively increase the area ratio of the sidewalls in the light extraction structure 121. The film layer of the light-emitting unit is thinner at the sidewalls, which can serve as the main light-emitting area, thereby increasing the effective light-emitting area of ​​the display panel.

[0103] In an exemplary embodiment, the display panel may further include a driving structure layer, a color filter layer, a passivation layer, a planarization layer, and a pixel definition layer. Please refer to FIG18 , which is a schematic cross-sectional view of another display panel provided in an embodiment of the present application. The display panel 10 includes a substrate 11 , a light extraction structure layer 12 , and a plurality of light-emitting units 13 . The light-emitting units 13 include a first electrode 131 , a light-emitting layer 132 , and a second electrode 133 .

[0104] The display panel 10 also includes a driving structure layer 14, which is located on the substrate 11 and is electrically connected to the light-emitting unit 13, thereby driving the light-emitting unit 13 to emit light. The multiple film layers of the driving structure layer 14 may include a first conductive structure layer 141, a first functional layer 142, a second conductive structure layer 143, a second functional layer 144, a third conductive structure 145, and a fourth conductive structure 146, which are sequentially arranged in a direction away from the substrate 10.

[0105] Exemplarily, the driving structure layer 14 may include multiple thin film transistors (TFTs) 147 , wherein the first conductive structure layer 141 may be the gate of the TFT 147 , the second conductive structure layer 143 may be the active layer of the TFT 147 , the third conductive structure 145 may be the source of the TFT 147 , and the fourth conductive structure 146 may be the drain of the TFT 147 . The third conductive structure 145 and the fourth conductive structure 146 may be co-layered. The materials of the first conductive structure layer 141 , the third conductive structure 145 , and the fourth conductive structure 146 may include metal materials such as copper, aluminum, and silver, while the material of the second conductive structure layer 143 may include semiconductor materials such as amorphous silicon. The first functional layer 142 may be an insulating layer between the gate and the active layer. The material of the first functional layer 142 may include silicon oxide and / or silicon nitride. The second functional layer 144 may be an ohmic contact layer between the active layer and the source, and an ohmic contact layer between the active layer and the drain.

[0106] The passivation layer 15 is located on the side of the driving structure layer 14 away from the substrate 11. The passivation layer 15 covers the multiple thin-film transistors 147 in the driving structure layer 14 and provides insulation protection, preventing external moisture from invading the driving structure layer 14. The passivation layer 15 includes multiple vias, and the light extraction structure layer 12 also includes multiple vias to electrically connect the thin-film transistors 147 to the light-emitting unit 13. Exemplarily, the material of the passivation layer 15 may include silicon oxide and / or silicon nitride.

[0107] Color filter layer 16 is located on the side of passivation layer 15 away from substrate 11, and the orthographic projection of color filter layer 16 on substrate 11 overlaps with the orthographic projection of light-emitting unit 13 on substrate 11. Color filter layer 16 may include multiple filter units 161. Color filter layer 16 can filter the light emitted by light-emitting unit 13, thereby improving the color purity of the light.

[0108] The pixel defining layer 17 is located on the side of the light extraction structure layer 12 away from the substrate 11 . The pixel defining layer 17 includes multiple openings. The light emitting units 13 are located in the multiple openings of the pixel defining layer 17 , so that the pixel defining layer 17 can be used to divide the multiple light emitting units 13 .

[0109] Furthermore, the thickness of the light extraction structure layer 12 in a direction perpendicular to the substrate 11 can range from 3 to 4 microns. The minimum distance between the light extraction structure 121 and the color filter layer 16 can be greater than 0.5 microns. This prevents the color filter layer 16 from being too close to the light extraction structure 121, thereby preventing the color filter layer 16 from affecting the shape of the light extraction structure 121 and the light extraction effect.

[0110] In summary, the embodiments of the present application provide a display panel comprising a substrate, a light extraction structure layer, and a plurality of light-emitting units. The light extraction structure layer comprises a plurality of light extraction structures, wherein the side of the light extraction structure away from the substrate comprises a plurality of first recessed structures recessed toward the substrate, and the side of the first recessed structure away from the substrate comprises at least one first sub-recessed structure recessed toward the substrate. Furthermore, the light-emitting units comprise a structure similar in shape to the first light extraction structure, thereby increasing the light-emitting area of ​​the light-emitting units and thereby improving the brightness of the display panel.

[0111] On the other hand, an embodiment of the present application provides a method for manufacturing a display panel. Please refer to FIG19 , which is a flow chart of a method for manufacturing a display panel provided by an embodiment of the present application. The method includes:

[0112] Step 1901: Obtain a substrate.

[0113] Step 1902: forming a light extraction structure layer on the substrate.

[0114] The light extraction structure layer includes multiple light extraction structures, and the light extraction structure is located on the substrate. The side of the light extraction structure away from the substrate has multiple first recessed structures recessed toward the direction close to the substrate, and the side of the first recessed structure away from the substrate has at least one first sub-recessed structure recessed toward the direction close to the substrate.

[0115] Step 1903: forming a plurality of light-emitting units on the substrate having the light extraction structure formed thereon.

[0116] Multiple light-emitting units correspond to multiple light extraction structures respectively, and the light-emitting units cover the corresponding light extraction structures. The light-emitting units are used to emit light beams in the direction toward the substrate. The light-emitting units have a second recessed structure corresponding to the first recessed structure, and a second sub-recessed structure corresponding to the first sub-recessed structure. The recessed direction of the second recessed structure is the same as the recessed direction of the first recessed structure, and the orthographic projection of the second recessed structure on the substrate overlaps with the orthographic projection of the corresponding first recessed structure on the substrate. The recessed direction of the second sub-recessed structure is the same as the recessed direction of the first sub-recessed structure, and the orthographic projection of the second sub-recessed structure on the substrate overlaps with the orthographic projection of the corresponding first sub-recessed structure on the substrate.

[0117] In summary, the embodiments of the present application provide a display panel comprising a substrate, a light extraction structure layer, and a plurality of light-emitting units. The light extraction structure layer includes a plurality of light extraction structures. The light extraction structure has a plurality of first recessed structures recessed toward the substrate on its side facing away from the substrate, and at least one first sub-recessed structure recessed toward the substrate on its side facing away from the substrate. Furthermore, the light-emitting units have structures similar in shape to the light extraction structures, thereby increasing the light-emitting area of ​​the light-emitting units and thereby improving the brightness of the display panel.

[0118] The present invention provides another method for manufacturing a display panel. Please refer to FIG20 , which is a flow chart of another method for manufacturing a display panel provided by the present invention. The method includes:

[0119] Step 2001: Obtain a substrate.

[0120] The substrate can be used to support other film layers in the display panel to improve the flatness of other film layers. The material of the substrate can include various light-transmitting materials such as glass.

[0121] Step 2002: forming a driving structure layer on a substrate.

[0122] The driving structure layer may be formed on the substrate and may include a first conductive structure layer, a first insulating layer, a second conductive structure layer, a second insulating layer, a third conductive structure layer, and a fourth conductive structure layer arranged in sequence away from the base. The driving structure layer may include multiple thin film transistors.

[0123] Step 2003: forming a passivation layer on the substrate having the driving structure layer formed thereon.

[0124] A passivation layer can be formed on the side of the driving structure layer away from the substrate. The passivation layer covers the multiple thin-film transistors in the driving structure layer and can provide insulation protection to prevent external moisture from invading the driving structure layer. The passivation layer may include multiple vias to electrically connect the thin-film transistors to the light-emitting units. Exemplary materials for the passivation layer may include silicon oxide and / or silicon nitride.

[0125] Step 2004: forming a color filter layer on a side of the passivation layer away from the substrate.

[0126] A color filter layer can be formed on the side of the passivation layer away from the substrate, with the orthographic projection of the color filter layer on the substrate overlapping the orthographic projection of the light-emitting unit on the substrate. The color filter layer can include multiple filter units, and the color filter layer can filter the light emitted by the light-emitting unit, thereby improving the color purity of the light.

[0127] Step 2005: forming a light extraction structure material layer on a side of the color filter layer away from the substrate.

[0128] A light extraction structure material layer can be formed on a side of the color filter layer away from the substrate. The light extraction structure material layer is used to form a plurality of light extraction structures, including a first recessed structure and a first sub-recessed structure. The material of the light extraction structure material layer can include a resin material. For example, the material of the light extraction structure material layer can be a negative resin material.

[0129] Step 2006 : forming a plurality of first recessed structures recessed toward the substrate on a side of the light extraction structure material layer away from the substrate through an exposure and development process.

[0130] The first recessed structures can be formed through an exposure and development process. Since the light extraction structure material layer can be made of a negative resin material, during the exposure process, a desired pattern can be projected onto the light extraction structure material layer through illumination. A chemical reaction occurs in the illuminated areas, while no chemical reaction occurs in the unilluminated areas. During the development process, the developer dissolves the unilluminated areas of the light extraction structure material layer, thereby forming a plurality of first recessed structures on the side of the light extraction structure material layer facing away from the substrate, which are recessed toward the substrate.

[0131] Step 2007 : forming at least one first sub-recessed structure recessed toward a direction close to the substrate through a photocuring process.

[0132] The first sub-recessed structure can be formed by a photocuring process. Please refer to Figure 21, which is a schematic diagram of the preparation process of a first sub-recessed structure provided by the present application. After the first recessed structure A1 is formed by the exposure and development process, the material of the light extraction structure material layer 122 has not yet been completely transformed into a solid state and still has a certain fluidity. Specifically, the material on the side of the light extraction structure material layer 122 away from the substrate 11 has a tendency to flow toward the direction close to the substrate 11. When the material of the light extraction structure material layer 122 flows and accumulates at the target position X, the material of the light extraction structure material layer 122 can be cured by the photocuring process, thereby forming a first sub-recessed structure B1 that is recessed in the direction close to the substrate 11. The target position X can be the position where the first sub-recessed structure B1 is farthest from the substrate 11. Among them, the material of the light extraction structure material layer 122 undergoes a photochemical reaction at a fast speed, so the curing rate of the photocuring process is fast, so that the position of the formed first sub-recessed structure B1 has high accuracy and controllability.

[0133] In addition, the position and size of the first sub-recessed structure B1 in a direction perpendicular to the substrate 11 can be controlled by controlling the time between the development process and the photocuring process. The longer the time between the development process and the photocuring process, the closer the position of the first sub-recessed structure B1 farthest from the substrate 11 is to the substrate 11, and the smaller the size of the first sub-recessed structure B1 in a direction parallel to the substrate 11 is. The shorter the time between the development process and the photocuring process, the further the position of the first sub-recessed structure B1 farthest from the substrate 11 is from the substrate 11, and the larger the size of the first sub-recessed structure B1 in a direction parallel to the substrate 11 is.

[0134] Step 2008: forming a light extraction structure layer through a baking process.

[0135] The solvent in the light extraction structure material layer can be removed by the baking process, so that the formed light extraction structure layer can have good mechanical properties and stability.

[0136] Step 2009: forming a first electrode on a side of the light extraction structure layer away from the substrate.

[0137] The first electrode can be formed on a side of the light extraction structure layer away from the substrate. The first electrode can have a second recessed structure corresponding to the first recessed structure, and a second sub-recessed structure corresponding to the first sub-recessed structure, thereby increasing the light-emitting area of ​​the light-emitting layer and, in turn, improving the brightness of the display panel. The first electrode can be an anode and can be electrically connected to the drive structure layer. Exemplarily, the material of the first electrode can include indium tin oxide.

[0138] Step 2010: forming a pixel defining layer on a side of the first electrode away from the substrate.

[0139] The pixel defining layer may be formed on a side of the first electrode away from the substrate. The pixel defining layer includes a plurality of openings. The light emitting units may be located in the plurality of openings of the pixel defining layer. Thus, the pixel defining layer may be used to divide the plurality of light emitting units.

[0140] Step 2011: forming a light-emitting layer and a second electrode on a side of the first electrode away from the substrate.

[0141] The light-emitting layer can be formed on the side of the first electrode facing away from the substrate, and the second electrode can be formed on the side of the light-emitting layer facing away from the substrate. Both the light-emitting layer and the second electrode can have a second recessed structure corresponding to the first recessed structure, as well as a second sub-recessed structure corresponding to the first sub-recessed structure. This can increase the light-emitting area of ​​the light-emitting layer and, in turn, improve the brightness of the display panel. The light-emitting layer can be an organic light-emitting layer, and the second electrode can be a cathode. The first and second electrodes can cooperate to drive the light-emitting layer. Exemplarily, the manufacturing process of the first electrode, the light-emitting layer, and the second electrode can include an evaporation process.

[0142] Step 2012: forming an encapsulation layer on a side of the second electrode away from the substrate.

[0143] An encapsulation layer can be formed on the side of the second electrode away from the substrate. This layer protects the display panel and blocks the intrusion of water and oxygen. The encapsulation layer can be a single layer or a multilayer structure. Exemplarily, the encapsulation layer can include an inorganic encapsulation layer and / or an organic encapsulation layer.

[0144] The present invention provides another method for manufacturing a display panel. Please refer to FIG22 , which is a flow chart of another method for manufacturing a display panel provided by the present invention. The method includes:

[0145] Step 2201: Obtain a substrate.

[0146] The substrate can be used to support other film layers in the display panel to improve the flatness of other film layers. The material of the substrate can include various light-transmitting materials such as glass.

[0147] Step 2202: forming a light extraction structure material layer on the substrate.

[0148] A light extraction structure material layer can be formed on the substrate. The light extraction structure material layer is used to form a plurality of light extraction structures including a first recessed structure and a first sub-recessed structure. The material of the light extraction structure material layer can include a resin material. Exemplarily, the material of the light extraction structure material layer can include a negative photoresist.

[0149] Step 2203: forming a plurality of first recessed structures recessed toward a direction close to the substrate on a side of the light extraction structure material layer away from the substrate.

[0150] The first recessed structure can be formed on a side of the light extraction structure material layer away from the substrate. The manufacturing process of the first recessed structure may include exposure, development, and baking.

[0151] Step 2204 : forming at least one first sub-recessed structure recessed toward a direction close to the substrate on a surface of the plurality of recessed structures away from the substrate.

[0152] The first sub-recess structure can be formed on a side of the plurality of recess structures away from the substrate. Specifically, please refer to FIG23 , which is a schematic diagram of a preparation process of another first sub-recess structure provided by the present application ( FIG23 may be a schematic diagram of a preparation process of the first sub-recess structure in the light extraction structure shown in FIG15 ). The preparation process of the first sub-recess structure may include:

[0153] Step S2301 : forming a hard mask M on a surface of the first recessed structure A1 away from the substrate 11 , wherein the hard mask M includes a plurality of hard mask openings K.

[0154] Step S2302 , etching the light extraction structure material layer 122 located in the hard mask opening, and then removing the hard mask M to form a first sub-recess structure B1 .

[0155] The material of the hard mask M may be a metal material. The manufacturing process of the hard mask M may be a patterning process. The patterning process involved in the embodiment of the present application may include coating photoresist, exposure, development, etching, and stripping photoresist, etc. In addition, the number of hard mask openings K may be the same as the number of first sub-recess structures B1 formed. For example, if the first recessed structure A1 shown in Figures 9, 12, and 13 includes one first sub-recess structure B1, the corresponding number of hard mask openings K may be one. If the first recessed structure A1 shown in Figure 14 includes two first sub-recess structures B1, the corresponding number of hard mask openings K may be two. If the first recessed structure A1 shown in Figure 15 includes three first sub-recess structures B1, the corresponding number of hard mask openings K may be three. If the first recessed structure A1 shown in Figure 16 includes four first sub-recess structures B1, the corresponding number of hard mask openings K may be four.

[0156] In addition, please refer to Figures 24 and 25. Figure 24 is a schematic diagram of the cross-sectional structure of a hard mask provided in the present application (Figure 24 may be a schematic diagram of the cross-sectional structure of the hard mask corresponding to the light extraction structure shown in Figure 14), and Figure 25 is a schematic diagram of the cross-sectional structure of another hard mask provided in the present application (Figure 25 may be a schematic diagram of the cross-sectional structure of the hard mask corresponding to the light extraction structure shown in Figure 16). In the light extraction structures shown in Figures 14 and 16, the ratio of the orthographic projection of the first sub-recess structure on the substrate to the orthographic projection of the first recess structure on the substrate is close to 1. Therefore, in order to make the slope angle α2 of the second side wall of the finally formed first sub-recess structure range from 30 degrees to 45 degrees, the slope angle α3 of the first side wall of the first recess structure formed in step 1903 can be less than 30 degrees, thereby facilitating the production of the first recess structure and the first sub-recess structure that meet the slope angle range.

[0157] Step 2205 : forming a plurality of light-emitting units on the substrate having the light extraction structure formed thereon.

[0158] Multiple light-emitting units correspond to multiple light extraction structures respectively, and the light-emitting units cover the corresponding light extraction structures. The light-emitting units are used to emit light beams in the direction toward the substrate. The light-emitting units have a second recessed structure corresponding to the first recessed structure, and a second sub-recessed structure corresponding to the first sub-recessed structure. The recessed direction of the second recessed structure is the same as the recessed direction of the first recessed structure, and the orthographic projection of the second recessed structure on the substrate overlaps with the orthographic projection of the corresponding first recessed structure on the substrate. The recessed direction of the second sub-recessed structure is the same as the recessed direction of the first sub-recessed structure, and the orthographic projection of the second sub-recessed structure on the substrate overlaps with the orthographic projection of the corresponding first sub-recessed structure on the substrate.

[0159] In summary, the embodiments of the present application provide a method for manufacturing a display panel comprising a substrate, a light extraction structure layer, and a plurality of light-emitting units. The light extraction structure layer includes a plurality of light extraction structures, wherein the side of the light extraction structure facing away from the substrate comprises a plurality of first recessed structures recessed toward the substrate, and the side of the first recessed structure facing away from the substrate comprises at least one first sub-recessed structure recessed toward the substrate. Furthermore, the light-emitting units include structures similar in shape to the light extraction structures, thereby increasing the light-emitting area of ​​the light-emitting units and thereby improving the brightness of the display panel.

[0160] In another aspect, embodiments of the present application provide a display device comprising a power supply assembly and a display panel according to the above embodiments. The power supply assembly can supply power to the display panel. The display device can be any device including a display function, and illustratively, can be an OLED display device.

[0161] Since the display device includes the display panel provided by the above embodiment, the display device can also have a similar effect, that is, the brightness of the display device can be improved.

[0162] In summary, the embodiments of the present application provide a display device comprising a substrate, a light extraction structure layer, and a plurality of light-emitting units. The light extraction structure layer includes a plurality of light extraction structures, wherein the side of the light extraction structure facing away from the substrate comprises a plurality of first recessed structures recessed toward the substrate, and the side of the first recessed structure facing away from the substrate comprises at least one first sub-recessed structure recessed toward the substrate. Furthermore, the light-emitting units include structures similar in shape to the light extraction structures, thereby increasing the light-emitting area of ​​the light-emitting units and thereby improving the brightness of the display panel.

[0163] In this application, the term "and / or" simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0164] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it may be the only layer between the two layers or elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0165] In this application, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more, unless expressly limited otherwise.

[0166] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that, The display panel includes: a substrate; a light extraction structure layer, the light extraction structure layer including a plurality of light extraction structures, the light extraction structures being located on the substrate, one side of the light extraction structures away from the substrate having a plurality of first recessed structures recessed in a direction close to the substrate, and on one side of the first recessed structures away from the substrate, having at least one first sub-recessed structure recessed in a direction close to the substrate; a plurality of light-emitting units, the plurality of light-emitting units being located on the substrate provided with the light extraction structure layer, the plurality of light-emitting units corresponding to the plurality of light extraction structures respectively, and the light-emitting units covering the corresponding light extraction structures, the light-emitting units having a second recessed structure corresponding to the first recessed structure and a second sub-recessed structure corresponding to the first sub-recessed structure, the recessed direction of the second recessed structure being the same as the recessed direction of the first recessed structure, and the orthographic projection of the second recessed structure on the substrate overlapping the orthographic projection of the corresponding first recessed structure on the substrate, the recessed direction of the second sub-recessed structure being the same as the recessed direction of the first sub-recessed structure, and the orthographic projection of the second sub-recessed structure on the substrate overlapping the orthographic projection of the corresponding first sub-recessed structure on the substrate.

2. The display panel according to claim 1, characterized in that, The plurality of light-emitting units include light-emitting units of at least three colors; The target ratios of the first sub-recessed structures in the light extraction structures corresponding to light-emitting units of at least two different colors are different, the target ratio being the ratio of the orthographic projection of the first sub-recessed structure on the substrate to the orthographic projection of the light extraction structure on the substrate.

3. The display panel according to claim 2, characterized in that, Among the at least three colors of light-emitting units, the target ratios of the first sub-recessed structures in the light extraction structures corresponding to light-emitting units of different colors are all different.

4. The display panel according to claim 2, characterized in that, The target ratio of the first sub-recessed structure in the light extraction structure is negatively correlated with the lifetime of the light-emitting unit corresponding to the light extraction structure.

5. The display panel according to claim 1, characterized in that, The first recessed structure includes a first bottom and a first sidewall located on a side of the first bottom away from the substrate, and the slope angle of the first sidewall ranges from 30 degrees to 45 degrees.

6. The display panel according to claim 5, characterized in that, The light-emitting unit includes a first part located on the first bottom and a second part located on the first sidewall, and the thickness of the first part is greater than the thickness of the second part.

7. The display panel according to claim 5, characterized in that, The first sub-recessed structure includes a second bottom and a second sidewall located on a side of the second bottom away from the substrate, and the slope angle of the second sidewall ranges from 30 degrees to 45 degrees.

8. The display panel according to claim 1, characterized in that, The first recessed structure includes one first sub-recessed structure, and the geometric center of the first sub-recessed structure is located on the center line of the first recessed structure.

9. The display panel according to claim 1, characterized in that, The first recessed structure includes one first sub-recessed structure, and the geometric center of the first sub-recessed structure is located outside the center line of the first recessed structure.

10. The display panel according to claim 1, characterized in that, The first recessed structure includes two first sub-recessed structures of different sizes, and the two first sub-recessed structures are connected.

11. The display panel according to claim 1, characterized in that, The first concave structure includes a plurality of first sub-concave structures, and the plurality of first sub-concave structures include a central sub-concave structure and a plurality of peripheral sub-concave structures surrounding the central sub-concave structure.

12. The display panel according to claim 1, characterized in that, The first concave structure includes a plurality of first sub-concave structures, and the plurality of first sub-concave structures are arranged around the center line of the first concave structure.

13. The display panel according to claim 1, characterized in that, On a surface of the first concave structure away from the substrate, there are a plurality of sub-regions, and the sub-regions are regions where the slope angle has monotonicity in a direction perpendicular to the substrate, and the plurality of sub-regions satisfy: Where k is the number of the plurality of sub-regions, d is the size of the sub-region in the direction perpendicular to the substrate, θ is the angle between the line connecting the two end points on the sub-region and the substrate, and the two end points are respectively the points on the sub-region that are farthest from the substrate and the points closest to the substrate, and D1 is the size of the first concave structure in the direction parallel to the substrate.

14. The display panel according to claim 11, characterized in that, The range of the angle θ between the line connecting the two end points on the sub-region and the substrate is: 30 degrees to 45 degrees.

15. The display panel according to any one of claims 1 to 14, characterized in that, The first concave structure and the first sub-concave structure include a concave structure with a curved surface or a trapezoidal concave structure, and the cross-section of the trapezoidal concave structure in the direction perpendicular to the substrate is trapezoidal.

16. The display panel according to any one of claims 1 to 14, characterized in that, The size of the first concave structure in the direction parallel to the substrate ranges from 3 μm to 10 μm.

17. The display panel according to any one of claims 1 to 14, characterized in that, The size of the first sub-concave structure in the direction parallel to the substrate is greater than or equal to 2 μm.

18. A manufacturing method of a display panel, characterized in that, The method includes: Obtaining a substrate; Forming a light extraction structure layer on the substrate, the light extraction structure layer includes a plurality of light extraction structures, the light extraction structures are located on the substrate, and one side of the light extraction structure away from the substrate has a plurality of first concave structures recessed in the direction close to the substrate, and on the side of the first concave structure away from the substrate, there is at least one first sub-concave structure recessed in the direction close to the substrate; Forming a plurality of light-emitting units on the substrate on which the light extraction structure is formed, the plurality of light-emitting units correspond to the plurality of light extraction structures, and the light-emitting units cover the corresponding light extraction structures, The light-emitting units are used to emit light beams in the direction towards the substrate, and the light-emitting units have a second concave structure corresponding to the first concave structure and a second sub-concave structure corresponding to the first sub-concave structure. The recessed direction of the second concave structure is the same as the recessed direction of the first concave structure, and the orthographic projection of the second concave structure on the substrate overlaps with the orthographic projection of the first concave structure on the substrate. The recessed direction of the second sub-concave structure is the same as the recessed direction of the first sub-concave structure, and the orthographic projection of the second sub-concave structure on the substrate overlaps with the orthographic projection of the first sub-concave structure on the substrate.

19. The method according to claim 18, characterized in that, The forming the light extraction structure layer on the substrate includes: Forming a light extraction structure material layer on the substrate; Forming a plurality of first concave structures recessed in the direction close to the substrate on the side of the light extraction structure material layer away from the substrate through an exposure and development process; Forming at least one first sub-concave structure recessed in the direction close to the substrate through a light curing process; Forming the light extraction structure layer through a baking process.

20. A display device, characterized in that, The display device includes a power supply component and the display panel according to any one of claims 1 to 17.

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