A display panel, a display device and a manufacturing method

Abstract

The present application provides a display panel, a display device and a manufacturing method. By disposing at least part of the first electrode and the second electrode such that their orthographic projections on the substrate are at least partially staggered from each other, the microcavity effect formed between the first electrode and the second electrode can be weakened, thereby the light-emitting angle of some regions can be adjusted, the light-emitting amount of some regions can be increased, and the problem of color deviation in some regions can be solved.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly relates to a display panel, a display device, and a manufacturing method thereof. Background Art

[0002] Organic Light-Emitting Diodes (OLEDs) have attracted wide attention due to their huge application markets in the fields of display and lighting. Compared with other display technologies, OLED display panels have many advantages, such as wide viewing angles, fast response speeds, low driving voltages, and the ability to achieve flexible displays. With the development of display technologies, curved display panels and curved display devices have gradually become an important development direction in the field of display technologies. However, the display effects of curved display panels including OLEDs still need to be improved. Summary of the Invention

[0003] In view of this, embodiments of the present application are committed to providing a display panel, a manufacturing method of the display panel, and a display device to improve the display effects of curved display panels including OLEDs.

[0004] A first aspect of the present application provides a display panel, including: a substrate; a light-emitting functional layer located on one side of the substrate, the light-emitting functional layer including a plurality of sub-light-emitting units arranged at intervals; and further including a first electrode and a second electrode electrically connected to at least one of the sub-light-emitting units; the first electrode and the second electrode are at least partially staggered in the orthographic projection on the substrate.

[0005] For example, the overlapping area of the orthographic projection of the second electrode on the substrate and the orthographic projection of the first electrode on the substrate is smaller than the area of the orthographic projection of the first electrode on the substrate; or, the orthographic projection of the second electrode on the substrate and the orthographic projection of the first electrode on the substrate are completely staggered.

[0006] For example, at least one of the first electrode and the second electrode is located on the side of the sub-light-emitting unit close to the substrate.

[0007] For example, when the at least one sub-light-emitting unit is one sub-light-emitting unit, the one sub-light-emitting unit includes a first region and a second region, the first electrode is electrically connected to the first region, and the second electrode is electrically connected to the second region; preferably, the light-emitting functional layer further includes: a series structure; the first electrode and the second electrode are disposed on the side of the sub-light-emitting unit close to the substrate, and the series structure is disposed on the side of the sub-light-emitting unit away from the substrate; or, the first electrode is disposed on the side of the sub-light-emitting unit close to the substrate, and the second electrode and the series structure are disposed on the side of the sub-light-emitting unit away from the substrate.

[0008] For example, the at least one sub-light-emitting unit includes: at least two sub-light-emitting units, and there are gaps between the at least two sub-light-emitting units and the orthographic projection of the substrate respectively; the light-emitting functional layer further includes: a series structure for connecting the at least two sub-light-emitting units in series in sequence; preferably, the series structure is a charge generation layer.

[0009] For example, the at least two sub-light-emitting units include: a first sub-light-emitting unit, at least partially disposed between the series structure and the first electrode; and a second sub-light-emitting unit, at least partially disposed between the series structure and the second electrode; preferably, the first electrode is disposed on a side of the first sub-light-emitting unit close to the substrate, the second electrode is disposed on a side of the second sub-light-emitting unit close to the substrate, and the series structure is located on a side of the first sub-light-emitting unit and the second sub-light-emitting unit away from the substrate.

[0010] For example, the at least two sub-light-emitting units further include: a third sub-light-emitting unit and a fourth sub-light-emitting unit; the series structure includes: a first series layer, a second series layer, and a third series layer; the first series layer and the third series layer are respectively located on a side of the at least two sub-light-emitting units away from the substrate, the first electrode, the second series layer, and the second electrode are respectively located on a side of the at least two sub-light-emitting units close to the substrate; the first sub-light-emitting unit is disposed between the first series layer and the first electrode; the second sub-light-emitting unit is disposed between the third series layer and the second electrode; the third sub-light-emitting unit is disposed between the first series layer and the second series layer; the fourth sub-light-emitting unit is disposed between the third series layer and the second series layer; preferably, the first sub-light-emitting unit, the second sub-light-emitting unit, the third sub-light-emitting unit, and the fourth sub-light-emitting unit have at least three colors.

[0011] For example, the first electrode is an anode, the second electrode is a cathode, and the thickness of the second electrode is 10 nm to 100 nm, preferably, the thickness of the second electrode is 50 nm - 100 nm;

[0012] Preferably, the display panel includes at least one of a curved display area, an edge display area, and a bent display area, and the at least one sub-light-emitting unit is disposed in at least one of the curved display area, the edge display area, and the bent display area.

[0013] A second aspect of the present application provides a display device, including the display panel described in the first aspect.

[0014] A third aspect of the present application provides a method for manufacturing a display panel, including: providing a substrate; forming a light-emitting functional layer on one side of the substrate, the light-emitting functional layer including a plurality of sub-light-emitting units arranged at intervals; the step of forming the light-emitting functional layer on one side of the substrate is as follows: forming a first electrode on one side of the substrate; forming a second electrode on one side of the substrate; forming at least one sub-light-emitting unit, and the at least one sub-light-emitting unit is electrically connected to the first electrode and the second electrode respectively; a positive projection of the second electrode on the substrate and a positive projection of the first electrode on the substrate are at least partially staggered.

[0015] The present application provides a display panel, a display device and a manufacturing method. By arranging the first electrode and the second electrode electrically connected to at least one sub-light-emitting unit such that their positive projections on the substrate are at least partially staggered, the microcavity effect formed between the first electrode and the second electrode can be weakened or eliminated. Furthermore, the light-emitting angle of some regions can be adjusted, the light-emitting amount of some regions can be increased, and the problem of color deviation in some regions can be solved. Description of the Drawings

[0016] Figure 1 Shown is a planar schematic diagram of a curved display panel applied in a smart phone;

[0017] Figure 2 Shown is a cross-sectional schematic diagram of a curved display panel applied in a smart phone along the Figure 1 X-X direction;

[0018] Figure 3 Shown is a schematic structural diagram of a pair of proportional light-emitting functional layers;

[0019] Figure 4 Shown is a cross-sectional schematic diagram of a light-emitting functional layer provided by an embodiment of the present application;

[0020] Figure 5 Shown is a cross-sectional schematic diagram of a light-emitting functional layer provided by another embodiment of the present application;

[0021] Figure 6 Shown is a cross-sectional schematic diagram of a light-emitting functional layer provided by another embodiment of the present application;

[0022] Figure 7 Shown is a cross-sectional schematic diagram of a light-emitting functional layer provided by another embodiment of the present application;

[0023] Figure 8 Shown is a cross-sectional schematic diagram of a light-emitting functional layer provided by another embodiment of the present application;

[0024] Figure 9 Shown is a three-dimensional schematic diagram of a light-emitting functional layer provided by another embodiment of the present application;

[0025] Figure 10 The figure shows a three-dimensional schematic diagram of a light-emitting functional layer provided by another embodiment of the present application;

[0026] Figure 11 The figure shows a flowchart of a manufacturing method of a display panel according to another embodiment of the present application;

[0027] Figure 12 The figure shows a flowchart of a manufacturing method of a light-emitting functional layer according to another embodiment of the present application.

[0028] Reference numerals:

[0029] AA - flat area; S - curved surface display area; 101 - optoelectronic coupling layer; 102 - cathode; 103 - electron injection layer; 104 - electron transport layer; 105 - hole blocking layer; 106 - light-emitting layer; B - EML - first sub-light-emitting unit; G - EML - second sub-light-emitting unit; R - EML - third sub-light-emitting unit; 107 - electron blocking layer; 108 - hole transport layer; 109 - hole injection layer; 109a - anode; 110 - light-emitting functional layer; 110a - first sub-light-emitting unit; 110b - second sub-light-emitting unit; 111 - first sub-light-emitting unit; 11 - hole injection layer; 12 - hole transport layer; 13 - light-emitting layer; 14 - electron transport layer; 15 - electron injection layer; 112 - second sub-light-emitting unit; 113 - third sub-light-emitting unit; 114 - fourth sub-light-emitting unit; 120 - first electrode; 130 - second electrode; 140 - insulating layer; 150 - series structure; 151 - first series layer; 152 - second series layer; 153 - third series layer.[[ID=]] Detailed embodiments

[0030] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0031] There are defects such as color deviation in some areas of the existing display panel, which affect the user experience. In order to improve the user experience and at the same time increase the screen-to-body ratio of the display device, the curved surface display panel has gradually become an important development direction in the display technology field. When the curved surface display panel is applied to a mobile phone, the picture spreads out of the screen like flowing water. However, there is still color deviation in some areas of the curved surface display panel. Especially in the curved surface area of the curved surface display panel, due to the relatively fast brightness attenuation in the curved surface area, there is a difference in brightness between the curved surface area and the non-curved surface area, resulting in a more obvious color deviation phenomenon in the curved surface area.

[0032] Figure 1 The figure shows a plan view of a curved display panel applied in a smart phone. Figure 2 The figure shows a cross-sectional view of the curved display panel applied in a smart phone along the Figure 1 X-X direction. As Figure 1 and Figure 2 shown, in the middle of the screen is the flat area AA of the screen, and on both sides of the flat area AA are the curved display areas S. The curved display area S is bent relative to the flat area AA, and the cross-sectional shape of the curved display area S can be arc-shaped (circular arc-shaped, elliptical arc-shaped), parabolic or other non-planar shapes. When the user views the curved display area S with a line of sight perpendicular to the flat area AA, the angle a between the user's line of sight and the tangent direction (the light emission direction) of the part of the curved display area S is relatively large. Therefore, after the curved display area S is designed to be bent, the viewing angle is increased. At the same time, due to the design of the curved screen, the substrate of the curved display panel is no longer an optically isotropic body, but has the property of birefringence, that is, linearly polarized light will become circularly polarized light after passing through the substrate, and the emitted spectrum will blue-shift as the viewing angle increases. Therefore, obvious color deviation phenomena and brightness attenuation problems occur in the curved display area S. That is to say, there is a difference in the colors of the curved display area S and the flat area AA of the curved screen viewed by the user, which brings certain troubles to the user and affects the user experience.

[0033] Figure 3 The figure shows a structural schematic diagram of a pair of proportional light-emitting functional layers. As Figure 3 shown, in a pair of proportions, the light-emitting functional layer is an organic light-emitting diode. The light-emitting functional layer includes a photoelectric coupling layer (CPL, Coupling Layer) 101, a cathode (Cathode) 102, an electron injection layer (EIL, Electron Injection Layer) 103, an electron transport layer (ETL, Electron Transport Layer) 104, a hole blocking layer (HBL, Hole Blocking Layer) 105, a light-emitting layer (EML, Emitting Layer) 106, an electron blocking layer (EBL, Electron Blocking Layer) 107, a hole transport layer (HTL, Hole Transport Layer) 108, a hole injection layer (HIL, Hole Injection Layer) 109, and an anode (Anode) 109a stacked from top to bottom. Among them, the light-emitting layer 106 includes a first sub-light-emitting unit B-EML, a second sub-light-emitting unit G-EML, and a third sub-light-emitting unit R-EML.

[0034] "Microcavity" is a cavity structure with a certain thickness defined between two layer structures with light reflection functions. "Microcavity effect" refers to that after light enters the light-emitting functional layer, it will continuously reflect back and forth in the microcavity to achieve the resonance effect of the microcavity, and then achieve the enhancement effect on the light of a specific wavelength in the emitted light. As Figure 2 shown, in the comparative example, a microcavity will be formed between the cathode and the anode of the light-emitting functional layer. Without the microcavity effect, light will be emitted relatively uniformly at the edge of the curved display area. The stronger the microcavity effect, the more the light reflects back and forth in the microcavity, which will cause the light-emitting angle of the light that could originally be emitted at the edge of the curved display area to change, and be emitted in the area outside the curved display area, which also makes the light intensity in the direction perpendicular to the section more concentrated, resulting in a large angle between the light-emitting direction of most of the curved display area S and the user's line of sight. Therefore, obvious color shift phenomenon and brightness attenuation problem occur in the curved display area S.

[0035] Since the substrate of the curved display panel is not an optically isotropic body, but has the property of birefringence, that is, linearly polarized light will become circularly polarized light after passing through the substrate, and the emission spectrum will blue-shift as the viewing angle increases, resulting in obvious color shift phenomenon and brightness attenuation problem in the curved display area S. Therefore, in order to reduce the color shift problem of the curved display panel, it is necessary to reduce the viewing angle of the curved display area, that is, to minimize the angle between the light-emitting direction of the curved display area S and the light-emitting direction of the flat area AA. By reducing the microcavity effect of the light-emitting device, it is possible to avoid the concentration of the light-emitting direction of the curved display area S in the direction perpendicular to the tangent of the curved display area, make the light intensity distribution uniform at all angles of the curved display area S, achieve the effect of reducing the viewing angle of the curved display area, and thus solve the color shift problem existing in the curved display panel.

[0036] For example, the prior art can adjust the optical path of the microcavity by adjusting the thickness of the hole transport layer 108, and then adjust the strength of the microcavity effect. The thinner the thickness of the hole transport layer 108, the smaller the optical path, the weaker the microcavity effect, and the more uniform the light intensity at all angles.

[0037] Again, the prior art can also control the microcavity by adjusting the thickness of the optoelectronic coupling layer 101, so as to balance the speed of light intensity attenuation in the curved display area. The optoelectronic coupling layer 101 is an organic film located above the cathode 102 to further improve the light emission efficiency of the organic light-emitting diode. The optoelectronic coupling layer can use materials with a refractive index greater than 1.8, such as amine compounds, aromatic polycyclic compounds, etc.

[0038] However, there is still a relatively large microcavity effect in the light-emitting functional layer of the comparative example, and the color shift problem in the curved display area cannot be completely solved.

[0039] In view of this, the present application provides a display panel to reduce the microcavity effect and solve the problems of color shift and brightness attenuation in the curved display area.

[0040] In one or more embodiments of the present application, the related basic concepts involved are described as follows:

[0041] The organic light-emitting diode includes at least one light-emitting device, which is disposed between the anode and the cathode and electrically connected to the anode and the cathode. When a current is applied, the anode injects holes and the cathode injects electrons into the light-emitting layer. The injected holes and electrons migrate towards the electrodes with opposite charges respectively. When an electron and a hole are located on the same molecule, an exciton is formed, which is a localized electron-hole pair with an excited energy state. When the exciton relaxes through a light-emission mechanism, light is emitted. In some cases, the exciton can be localized on an excimer or an exciplex.

[0042] Figure 4 The cross-sectional schematic diagram of the light-emitting functional layer provided by an embodiment of the present application is shown. Figure 5 The cross-sectional schematic diagram of the light-emitting functional layer provided by another embodiment of the present application is shown. As Figure 4 and Figure 5 shown, the light-emitting functional layer includes at least one sub-light-emitting unit, a first electrode 120, and a second electrode 130.

[0043] The first electrode 120 is electrically connected to the at least one sub-light-emitting unit. Specifically, the first electrode 120 is electrically connected to a sub-light-emitting unit, and the sub-light-emitting unit includes a first region and a second region. The first electrode 120 is electrically connected to the first region in at least one sub-light-emitting unit. The second electrode 130 is electrically connected to the second region in the at least one sub-light-emitting unit. The second electrode 130 is electrically connected to the second region in the at least one sub-light-emitting unit, and the second region does not coincide with the first region. Specifically, the at least one sub-light-emitting unit can specifically be one sub-light-emitting unit, two sub-light-emitting units, or multiple sub-light-emitting units. When the at least one sub-light-emitting unit is specifically one sub-light-emitting unit, the first region and the second region can be at different positions in the same sub-light-emitting unit, and the first region and the second region can be on the same side or different sides of a sub-light-emitting unit. When the at least one sub-light-emitting unit is specifically two sub-light-emitting units or multiple sub-light-emitting units, the first electrode 120 and the second electrode 130 can be electrically connected to two sub-light-emitting units among the multiple sub-light-emitting units, and the first region and the second region can be respectively on different sub-light-emitting units.

[0044] The positive projections of the first electrode and the second electrode on the substrate are at least partially staggered. In a sub-light-emitting unit, by partially staggering the first electrode and the second electrode, the microcavity effect between the first electrode and the second electrode in this sub-light-emitting unit can be reduced. Specifically, in the light-emitting functional layer of the comparative example, the shapes and sizes of the anode and the cathode are basically the same, and the microcavity effect is basically formed between the entire anode and the cathode. However, in the present embodiment, the positive projections of the first electrode and the second electrode on the substrate are at least partially staggered, so that the overlapping area of the first electrode and the second electrode is significantly smaller than that of the first electrode or the second electrode, and the microcavity effect is only formed in the overlapping area of the first electrode and the second electrode. Therefore, compared with the comparative example, the microcavity effect of the present application is significantly reduced.

[0045] Although in the actual processing process, the areas of the anode and the cathode of the display panel are different, and there is also a certain degree of overlapping setting (for example, in a display panel, in order to improve the processing efficiency, a plurality of cathodes of the light-emitting functional layer are integrally formed, and the area of the cathode is basically the same as the area of the substrate, and a plurality of anodes are arranged at intervals), in the prior art, the area of the positive projection of the cathode of the display panel on the substrate actually covers the area of the positive projection of the anode on the substrate, that is, the overlapping area of the anode and the cathode is equal to the area of all the anodes. However, the overlapping area of the first electrode and the second electrode in a sub-light-emitting unit of the present application is significantly smaller than that of the first electrode, having the effect of significantly reducing the microcavity effect.

[0046] In one embodiment, as Figure 4 shown, at least one sub-light-emitting unit is specifically the first sub-light-emitting unit 110a. The overlapping area of the positive projection of the second electrode on the substrate and the positive projection of the first electrode on the substrate is smaller than the area of the positive projection of the first electrode on the substrate. The first electrode 120 and the second electrode 130 are arranged on different sides of the first sub-light-emitting unit 110a. In this embodiment, the positive projections of the first electrode 120 and the second electrode 130 on the substrate are at least partially staggered, that is, the overlapping area of the positive projection of the second electrode on the substrate and the positive projection of the first electrode on the substrate is smaller than the area of the positive projection of the first electrode on the substrate. Therefore, the overlapping area of the positive projections of the first electrode 120 and the second electrode 130 on the substrate is small, and the microcavity effect can be reduced. Alternatively, the positive projection of the second electrode on the substrate and the positive projection of the first electrode on the substrate are completely staggered. Therefore, the overlapping area of the positive projections of the first electrode 120 and the second electrode 130 on the substrate is zero, and the microcavity effect can be eliminated.

[0047] In another embodiment, as Figure 5As shown, at least one sub-light-emitting unit is specifically the first sub-light-emitting unit 110a. The first electrode 120 and the second electrode 130 are disposed on the same side of the first sub-light-emitting unit 110a, and there is a gap between the orthographic projection of the second electrode 130 on the substrate and the orthographic projection of the first electrode 120 on the substrate. That is to say, the first electrode 120 and the second electrode 130 are respectively disposed on the same side of the first sub-light-emitting unit 110a at a predetermined distance in the horizontal direction, and an insulating material with good insulation can be filled in the gap between the first electrode 120 and the second electrode 130 to form an insulating layer 140. The better the insulation of the insulating material, the smaller the gap between the first electrode 120 and the second electrode 130 can be, and thus the integration degree of the display panel can be improved. For example, the insulating layer 140 can be a pixel defining structure formed of an organic material or the like.

[0048] In an embodiment, the orthographic projection of at least one sub-light-emitting unit on the plane where the first electrode 120 or the second electrode 130 is located can cover the first electrode 120 and the second electrode 130. The sub-light-emitting unit is located above the first electrode 120 and the second electrode 130, and the sub-light-emitting unit covers the entire upper surface of the first electrode 120 and the second electrode 130. That is to say, the projection of the sub-light-emitting unit on the plane where the first electrode 120 or the second electrode 130 is located is basically equal to or slightly larger than the sum of the areas of the upper surfaces of the first electrode 120, the insulating layer 140, and the second electrode 130. In an embodiment, the light-emitting functional layer includes a plurality of sub-light-emitting units, the sub-light-emitting unit can be an organic light-emitting diode, and the light-emitting functional layer is applicable to a curved screen including an organic light-emitting diode. For example, a curved mobile phone screen, a curved TV screen, and a curved display screen, etc.

[0049] The display panel of the embodiment of the present application further includes a substrate (not shown). A plurality of light-emitting functional layers are located on one side of the substrate. In an embodiment, the substrate can be disposed on one side of the first electrode 120 and the second electrode 130, or can be disposed on one side of the sub-light-emitting unit. In an embodiment, the substrate can be disposed on one side of the first electrode 120 and the second electrode 130.

[0050] Optionally, in another embodiment, a buffer layer can also be provided on the substrate to inhibit moisture or other foreign matters from penetrating through the substrate.

[0051] The first electrode 120 and the second electrode 130 can be formed on the substrate by evaporation. A fine metal mask used as a deposition mask can be used to form the first electrode 120 and the second electrode 130 into a predetermined shape. There is a gap between the first electrode 120 and the second electrode 130 in the horizontal direction, that is to say, the first electrode 120 and the second electrode 130 do not overlap in the vertical direction. The formation of the microcavity effect between the first electrode 120 and the second electrode 130 can be avoided, and thus the light-emitting angle of the curved display area S can be adjusted, solving the problem of color deviation in the curved display area S. The bottom surfaces of the first electrode 120 and the second electrode 130 are basically at the same height, or rather, the bottom surfaces of the first electrode 120 and the second electrode 130 are basically in the same plane.

[0052] One of the first electrode 120 or the second electrode 130 can be an anode and the other can be a cathode. In one embodiment, the first electrode 120 can be an anode and the second electrode 130 can be a cathode.

[0053] The first electrode 120 can be made of a conductive material such as a metal, a conductive metal oxide, or a combination thereof, such as a conductive material known in the art. The first electrode 120 can include a metal or its alloy, and the metal includes nickel, platinum, vanadium, chromium, copper, zinc, and gold; conductive metal oxides such as zinc oxide, indium oxide, tin oxide, indium tin oxide (ITO), indium zinc oxide (IZO), or fluorine-doped tin oxide; or a combination of a metal and a metal oxide such as a combination of ZnO and Al or SnO2 and Sb, but not limited thereto. A combination including at least two of the foregoing can also be used. In an embodiment, the first electrode 120 can include a transparent conductive metal oxide such as indium tin oxide.

[0054] The second electrode 130 can include a conductive material such as a metal, a conductive metal oxide, a conductive polymer, or a combination thereof, such as a conductive material known in the art. The second electrode 130 can include, for example, a metal or its alloy, such as aluminum, magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, silver, gold, platinum, tin, lead, cesium, or barium; materials with a multilayer structure such as LiF / Al, Li2O / Al, lithium 8-hydroxyquinoline / aluminum (Liq / Al), LiF / Ca, or BaF2 / Ca, but not limited thereto. A combination including at least two of the foregoing can also be used. The details of the conductive metal oxide are the same as those described above.

[0055] Optionally, as another embodiment, the first electrode 120 can be a light-transmissive (i.e., transparent) electrode or a non-light-transmissive (i.e., non-transparent) electrode. The second electrode 130 can be a light-transmissive (i.e., transparent) electrode or a non-light-transmissive (i.e., non-transparent) electrode. The light-transmissive electrode can be made of materials such as conductive oxides such as zinc oxide, indium oxide, tin oxide, indium tin oxide (ITO), indium zinc oxide (IZO), fluorine-doped tin oxide, including single or multiple layers of thin metal layers, or combinations thereof. The non-light-transmissive electrode can include, for example, opaque conductive materials such as aluminum, silver, gold, or combinations thereof.

[0056] The first electrode 120 and the second electrode 130 can include one or more layers, and the materials of the respective layers of the multiple layers can be different. The first electrode 120 can be a transparent structure or a non-transparent structure, and the second electrode 130 can be a transparent structure or a non-transparent structure. In one embodiment, both the first electrode 120 and the second electrode 130 are non-transparent structures. Specifically, the first electrode 120 can include a first reflective layer (not shown). The second electrode 130 can include a second reflective layer (not shown).

[0057] Since the first electrode 120 and the second electrode 130 are disposed on the same side of at least one sub-light-emitting unit, and the light transmittance of the first electrode 120 and the second electrode 130 is relatively low, the light-emitting direction of the light-emitting functional layer 110 can be designed to be other sides different from the first electrode 120 and the second electrode 130. For example, if the first electrode 120 and the second electrode 130 are disposed on the lower surface of the light-emitting functional layer 110, the light-emitting functional layer 110 emits light upward from the upper surface. Designing the first electrode 120 and the second electrode 130 as non-transparent structures can play a role in reflection and increase the light-emitting intensity of the light-emitting functional layer 110.

[0058] The thickness of the first electrode 120 and the second electrode 130 can be greater than or equal to about 5 nanometers (nm), for example, greater than or equal to about 50 nm, greater than or equal to about 100 nm, greater than or equal to about 500 nm, or greater than or equal to about 1 μm. For example, the thickness of the electrode can be less than or equal to about 100 micrometers (μm), for example, less than or equal to about 10 μm, less than or equal to about 1 μm, less than or equal to about 900 nm, less than or equal to about 500 nm, or less than or equal to about 100 nm.

[0059] The thickness of the second electrode 130 is greater than the thickness of the first electrode 120, that is to say, the thickness of the first electrode 120 is less than the thickness of the second electrode 130.

[0060] In one embodiment, the material of the first electrode 120 is indium tin oxide, and the thickness of the first electrode 120 is about 30 nm. The material of the second electrode 130 is silver, and an alloy of magnesium and silver can be used. The thickness of the second electrode 130 is 100 nm.

[0061] In one embodiment, the thickness of the second electrode 130 is greater than the thickness of the cathode in the comparative example because the cathode in the comparative example is located above the sub-light emitting unit. That is to say, the light emitted by the sub-light emitting unit needs to pass through the cathode first and then be emitted outward. Therefore, too thick a thickness of the cathode in the comparative example will result in a decrease in the light transmittance of the second electrode 130, and further lead to a decrease in the light extraction efficiency. However, the resistance of a conductor is inversely proportional to the cross-sectional area of the conductor. Therefore, a thinner cathode has a very large resistance, resulting in a large resistance voltage drop (IR Drop). In the present application, both the second electrode 130 and the first electrode 120 are located below the sub-light emitting unit, and increasing the thickness of the second electrode 130 will not reduce the light extraction efficiency. Therefore, there is no limitation on the thickness of the second electrode 130 in the structure of the light-emitting functional layer of the present application, and the thickness of the second electrode 130 can be increased as needed to solve the problem of the large resistance voltage drop existing in the comparative example.

[0062] In one embodiment, the height positions of the sub-light emitting units are substantially the same, and there are gaps between the sub-light emitting units.

[0063] In another embodiment, the height positions of the sub-light emitting units can also be different.

[0064] The sub-light emitting unit may include a single layer or a stacked (multi-layer) structure having at least two layers. In the multi-layer structure, adjacent layers (for example, the first light-emitting layer and the second light-emitting layer) may have different properties and / or different compositions.

[0065] The sub-light emitting unit is used for emitting light and includes at least a light-emitting layer (not shown) and at least one of a hole injection layer (not shown), a hole transport layer (not shown), an electron transport layer (not shown), and an electron injection layer (not shown). According to the structure and characteristics of the sub-light emitting unit, some components in the sub-light emitting unit can also be omitted. Specifically, an organic light-emitting layer and an inorganic light-emitting layer can be applied as the light-emitting layer.

[0066] In one embodiment, the light-emitting layer is an organic light-emitting layer. The material of the organic light-emitting layer must have strong fluorescence in the solid state, good electron / hole transport performance, good thermal stability and chemical stability, high quantum efficiency, and the ability to be vacuum-evaporated.

[0067] In one embodiment, the light-emitting layer may have a band gap greater than or equal to about 2.4 eV and less than or equal to about 2.9 eV or greater than or equal to about 2.7 eV and less than or equal to about 3 eV.

[0068] In one embodiment, the light-emitting layer may include one sub-light-emitting layer (not shown) or multiple sub-light-emitting layers. The light-emitting color and the number of each sub-light-emitting layer can be adaptively adjusted according to design requirements to adjust the light-emitting intensity and light-emitting color in the light-emitting functional layer 110. The light-emitting colors of each sub-light-emitting layer are different. By stacking multiple sub-light-emitting layers with different light-emitting colors, the bandwidth of the light emitted by the light-emitting layer is wider and the light-emitting color is more abundant.

[0069] The materials of the light-emitting layers in each sub-light-emitting unit can be the same or different. The sub-light-emitting units can be used to emit red light, green light, blue light, etc.

[0070] The hole injection layer and the hole transport layer are used to smoothly transport holes to the light-emitting layer.

[0071] The electron transport layer is used to make electrons move smoothly from the charge generation layer to the light-emitting layer.

[0072] The electron injection layer is an organic layer that smoothly injects electrons from the electrode.

[0073] Figure 6 The following is a cross-sectional schematic diagram of the light-emitting functional layer provided by another embodiment of the present application. As Figure 6 shown, the light-emitting functional layer 110 includes at least two sub-light-emitting units, a first electrode 120, a second electrode 130, and a series structure 150.

[0074] There is a gap between the positive projections of at least two sub-light-emitting units and the substrate.

[0075] In one embodiment, as Figure 6 shown, the light-emitting functional layer 110 includes two sub-light-emitting units (i.e., a first sub-light-emitting unit 110a and a second sub-light-emitting unit 110b), and there is a gap between the two sub-light-emitting units in the direction parallel to the substrate.

[0076] The series structure 150 is used to connect at least two sub-light-emitting units in series. Specifically, the series structure 150 is a charge generation layer (CGL, Charge Generation Layer). At least two of the multiple sub-light-emitting units are connected in series through the charge generation layer.

[0077] The charge generation layer connects multiple sub-light-emitting units in series as a connection layer. Compared with a device having a single sub-light-emitting unit, the current efficiency and light-emitting brightness of the series device can be doubled, and at the same brightness, the current density of the series device is lower, so its lifespan is also greatly increased. The meaning of the charge generation layer is that in an organic light-emitting element having multiple sub-light-emitting units, the charge generation layer is disposed between two adjacent sub-light-emitting units. For one sub-light-emitting unit, it generates electrons and acts as a cathode, and for another sub-light-emitting unit, it generates holes and acts as an anode.

[0078] In one embodiment, the charge generation layer is located on two sub-light-emitting units. After the sub-light-emitting units emit light, the light passes through the charge generation layer and is emitted outward. The charge generation layer has high transparency. Compared with the comparative example, the structure of the light-emitting functional layer of the present application can improve the light transmittance. In addition, since the overlapping area of the orthographic projections of the first electrode 120 and the second electrode 130 on the substrate is zero, the microcavity effect can be further eliminated.

[0079] The charge generation layer includes an N-type charge generation layer and a P-type charge generation layer, which are used to balance the transport of carriers. The N-type charge generation layer can be formed by an organic layer doped with an alkali metal such as lithium (Li), sodium (Na), potassium (K), or cesium (Cs) or an alkaline earth metal such as magnesium (Mg), strontium (Sr), barium (Ba), or radium (Ra) (but not limited to any of them). The P-type charge generation layer can be formed by an organic layer obtained by doping an organic matrix material with hole-transporting ability with a dopant. The tandem structure 150 helps to improve the light-emitting efficiency and light-emitting brightness of the device.

[0080] In one embodiment, the charge generation layer can select the structure of an electron transport layer and Yb doping or an electron transport layer and Li doping. The overall thickness can be 5 nm to 15 nm, and the doping ratio is selected to be 1% to 5%.

[0081] Figure 7 The following is a cross-sectional schematic diagram of the light-emitting functional layer provided by another embodiment of the present application. As Figure 7 shown, the light-emitting functional layer 110 includes: at least two sub-light-emitting units, a first electrode 120, a second electrode 130, and a tandem structure 150. Among them, the at least two sub-light-emitting units include a first sub-light-emitting unit 111 and a second sub-light-emitting unit 112. At least a part of the first sub-light-emitting unit 111 is disposed between the tandem structure 150 and the first electrode 120. Preferably, the first sub-light-emitting unit 111 includes a hole injection layer 11, a hole transport layer 12, a light-emitting layer 13, an electron transport layer 14, and an electron injection layer 15 stacked on the first electrode 120. At least a part of the second sub-light-emitting unit 112 is disposed between the tandem structure 150 and the second electrode 130. The second sub-light-emitting unit 112 includes an electron injection layer 15, an electron transport layer 14, a light-emitting layer 13, a hole transport layer 12, and a hole injection layer 11 stacked on the second electrode 130.

[0082] In one embodiment, the first electrode 120 is disposed on the side of the first sub-light-emitting unit 111 close to the substrate, the second electrode 130 is disposed on the side of the second sub-light-emitting unit 112 close to the substrate, and the tandem structure 150 is located on the side of the first sub-light-emitting unit 111 and the second sub-light-emitting unit 112 away from the substrate.

[0083] In one embodiment, all of the first sub-light-emitting units 111 are disposed between the series structure 150 and the first electrode 120, and all of the second sub-light-emitting units 112 are disposed between the series structure 150 and the second electrode 130 to improve the utilization rate of the first sub-light-emitting units 111 and the second sub-light-emitting units. The series structure 150 covers the upper surfaces of the first sub-light-emitting units 111 and the second sub-light-emitting units 112. That is to say, the area of the lower surface of the series structure 150 is slightly larger than the sum of the areas of the upper surfaces of the first sub-light-emitting units 111 and the second sub-light-emitting units 112, which can reduce the volume of the display panel and improve the integration degree of the display panel while ensuring the luminous efficiency of the display panel.

[0084] The first electrode 120, the first sub-light-emitting units 111, the series structure 150, the second sub-light-emitting units 112, and the second electrode 130 are connected in series in the circuit in sequence.

[0085] In one embodiment, the first sub-light-emitting units 111 and the second sub-light-emitting units 112 have the same light-emitting color. Specifically, the colors of the first sub-light-emitting units 111 and the second sub-light-emitting units 112 are one of red, green, and blue. For example, the light-emitting colors of the first sub-light-emitting units 111 and the second sub-light-emitting units 112 are both red.

[0086] In another embodiment, the first sub-light-emitting units 111 and the second sub-light-emitting units 112 have different light-emitting colors. Specifically, the colors of the first sub-light-emitting units 111 and the second sub-light-emitting units 112 are two of red, green, and blue respectively. For example, the light-emitting color of the first sub-light-emitting unit 111 is blue, and the light-emitting color of the second sub-light-emitting unit 112 is green.

[0087] Figure 8 The following shows a cross-sectional schematic diagram of a light-emitting functional layer provided by another embodiment of the present application. As Figure 8 shown, the light-emitting functional layer 110 includes: first sub-light-emitting units 111, second sub-light-emitting units 112, third sub-light-emitting units 113, fourth sub-light-emitting units 114, a first electrode 120, a second electrode 130, and a series structure 150.

[0088] The difference from the previous embodiment is that the light-emitting functional layer 110 further includes a third sub-light-emitting unit 113 and a fourth sub-light-emitting unit 114. Specifically, the sub-light-emitting units are arranged at intervals in the horizontal direction. The series structure 150 includes a first series layer 151, a second series layer 152, and a third series layer 153. The first sub-light-emitting unit 111 is disposed between the first series layer 151 and the first electrode 120. The second sub-light-emitting unit 112 is disposed between the third series layer 153 and the second electrode 130. The third sub-light-emitting unit 113 is disposed between the first series layer 151 and the second series layer 152. The fourth sub-light-emitting unit 114 is disposed between the third series layer 153 and the second series layer 152.

[0089] Specifically, the first series layer 151 and the third series layer 153 are respectively located above the upper surface of the sub-light-emitting unit, and the first electrode 120, the second series layer 152, and the second electrode 130 are respectively located below the lower surface of the sub-light-emitting unit. The second series layer 152 can be formed on the substrate. The second series layer 152, the first electrode 120, and the second electrode 130 are arranged at intervals in the horizontal direction, and the second series layer 152 is located in the area between the first electrode 120 and the second electrode 130. There are gaps between the second series layer 152, the first electrode 120, and the second electrode 130, and the gaps can be filled with a material having good insulation and reflectivity to form an insulating layer 140. The insulating layer can also be the material used for the pixel defining layer.

[0090] At least two sub-light-emitting units include the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114. There are gaps between the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 in the horizontal direction, and the first sub-light-emitting unit 111, the third sub-light-emitting unit 113, the fourth sub-light-emitting unit 114, and the second sub-light-emitting unit 112 are respectively formed on the first electrode 120, the second series layer 152, and the second electrode 130. Specifically, any one of methods such as evaporation, sputtering, chemical vapor deposition, electrochemical method, spin coating, inkjet printing, or radiative heat transfer can be used to form them.

[0091] Figure 9 The following is a three-dimensional schematic diagram of the light-emitting functional layer provided by another embodiment of the present application. As Figure 9 shown, the first sub-light-emitting unit 111, the third sub-light-emitting unit 113, the fourth sub-light-emitting unit 114, and the second sub-light-emitting unit 112 are arranged from left to right. The cross-sectional view formed along the Figure 8 YY line in Figure 8 can be referred to

[0092] Figure 10The following is a three-dimensional schematic diagram of the light-emitting functional layer provided by another embodiment of the present application. As Figure 10 shown, the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 are divided into two rows and two columns. Through such a layout, the sub-light-emitting units can be made to be more concentrated, and the light-emitting intensity of the light-emitting functional layer 110 can be improved. Along Figure 9 the cross-sectional view formed by the broken line ABCD can be referred to Figure 8 .

[0093] It should be understood that in other embodiments, the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 may also have various different layouts on the plane.

[0094] It should be understood that the shapes and areas of the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 can be adaptively adjusted according to design requirements. For example, the areas of the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 are not the same. The shapes of the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 can be trapezoids, triangles, etc.

[0095] The first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 at least include a light-emitting material of one color. Further, the colors of the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 are one of red, green, and blue. For example, the colors of the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 are all green.

[0096] The first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 at least include light-emitting materials of two colors. Further, the colors of the light emitted by the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 are two of red, green, and blue. For example, the colors of the light emitted by the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 are red, green, green, and red respectively.

[0097] The first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 each include at least three kinds of light-emitting materials. Preferably, the colors of the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 are three of red, green, and blue.

[0098] In one embodiment, for example, the colors of light emitted by the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 are red, green, blue, and red respectively. By designing the area of the red sub-light-emitting unit to be larger, the light-emitting functional layer can emit reddish white light, which can solve the color deviation problem of the curved display panel.

[0099] In one embodiment, for example, the colors of light emitted by the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 can be matched with different colors according to the color deviation difference in the display panel, which can solve the color deviation problem of the curved display panel.

[0100] In this embodiment, the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 are arranged at intervals in the horizontal direction and are sequentially connected in series through the series structure 150, and each emits light of a different color, which can improve the color deviation while reducing the microcavity effect and improving the light-emitting efficiency.

[0101] The shapes and sizes of the first sub-light-emitting unit 111, the second sub-light-emitting unit 112, the third sub-light-emitting unit 113, and the fourth sub-light-emitting unit 114 can all be adaptively adjusted according to design requirements.

[0102] The display panel includes at least one of a curved display area, an edge display area, and a bent display area, and the at least one sub-light-emitting unit is disposed in at least one of the curved display area, the edge display area, and the bent display area.

[0103] In one embodiment, the display panel includes a display area. The display area of the display panel includes a flat area and a curved display area, and the flat area and the curved display area respectively correspond to different sub-light-emitting units. The sub-light-emitting unit corresponding to the curved display area of the display panel can refer to the sub-light-emitting unit in the above embodiments of the present application, and the sub-light-emitting unit corresponding to the flat area of the display panel can refer to the sub-light-emitting unit in the comparative example. It should be understood that the sub-light-emitting unit corresponding to the curved display area can be adaptively adjusted according to the needs of the display panel. For example, the area and quantity of different color sub-light-emitting units in the light-emitting functional layer can be adjusted according to the degree of color deviation.

[0104] In another embodiment, the display area of the display panel includes a planar area, and the planar area includes an edge display area. The sub-light-emitting units corresponding to the edge display area of the display panel may refer to the sub-light-emitting units in the above embodiments of the present application.

[0105] In another embodiment, the sub-light-emitting units corresponding to the display areas with relatively large color deviation differences in the display area of the display panel may refer to the sub-light-emitting units in the above embodiments of the present application.

[0106] In another embodiment, the display area of the display panel includes a planar area and a bent display area. The sub-light-emitting units corresponding to the bent display area of the display panel may refer to the sub-light-emitting units in the above embodiments of the present application.

[0107] Another embodiment of the present application provides a display device, including the display panel of the previous embodiment. Specifically, the display device may be a smart phone, a computer monitor, a game console, a television, etc.

[0108] Another embodiment of the present application provides a manufacturing method of a display panel. Figure 11 The following shows a schematic flow chart of the manufacturing method of the display panel of another embodiment of the present application. The structure of the display panel may refer to Figure 5 . As Figure 11 and Figure 5 shown, the manufacturing method of the display panel includes the following steps:

[0109] Step S1010: Provide a substrate.

[0110] Step S1020: Form a light-emitting functional layer on one side of the substrate.

[0111] Specifically, the step of forming the light-emitting functional layer on one side of the substrate is as follows:

[0112] Step S1021: Form a first electrode on one side of the substrate.

[0113] Step S1022: Form a second electrode on one side of the substrate.

[0114] Step S1023: Form at least one sub-light-emitting unit. The at least one sub-light-emitting unit is electrically connected to the first electrode and the second electrode respectively.

[0115] The orthographic projection of the second electrode on the substrate and the orthographic projection of the first electrode on the substrate are at least partially staggered.

[0116] The overlapping area of the orthographic projection of the second electrode on the substrate and the orthographic projection of the first electrode on the substrate is smaller than the area of the orthographic projection of the first electrode on the substrate.

[0117] In step S1021, a first electrode 120 is formed on one side of the substrate.

[0118] Specifically, any one of methods such as evaporation, sputtering, chemical vapor deposition, electrochemical method, spin coating, inkjet printing, or radiative heat transfer can be used to form it.

[0119] In one embodiment, the material of the first electrode 120 is indium tin oxide, a reflective layer, indium tin oxide. The first electrode 120 is formed on the substrate by evaporation. A fine metal mask is used to make the first electrode 120 form a predetermined shape and is formed at a predetermined position on the substrate. The thickness of the first electrode 120 is about 25 nm to 50 nm.

[0120] In step S1022, a second electrode 130 is formed on one side of the substrate.

[0121] The overlapping area of the orthographic projection of the second electrode on the substrate and the orthographic projection of the first electrode on the substrate is smaller than the area of the orthographic projection of the first electrode on the substrate. Further, when the overlapping area of the orthographic projection of the second electrode on the substrate and the orthographic projection of the first electrode on the substrate is zero, there is a gap between the orthographic projection area of the first electrode on the substrate, the second electrode 130 and the first electrode 120.

[0122] Specifically, any one of methods such as evaporation, sputtering, chemical vapor deposition, electrochemical method, spin coating, inkjet printing, or radiative heat transfer can be used to form it.

[0123] In one embodiment, the material of the second electrode 130 is silver. The second electrode 130 is formed on the substrate by evaporation. A fine metal mask is used to make the second electrode 130 form a predetermined shape and is formed at a predetermined position on the substrate. The thickness of the second electrode 130 is about 50 nm to 100 nm.

[0124] In another embodiment, the material of the second electrode 130 is silver. The second electrode 130 can be formed on the substrate by inkjet printing.

[0125] The thickness of the second electrode 130 is greater than the thickness of the first electrode 120. Further, the thickness of the second electrode 130 is greater than the thickness of the second electrode 130 in the comparative example.

[0126] After the first electrode 120 and the second electrode 130 are formed, an insulating layer 140 is formed between the first electrode 120 and the second electrode 130.

[0127] In step S1023, at least one sub-light emitting unit is formed.

[0128] Each of the at least one sub-light-emitting unit is electrically connected to the first electrode and the second electrode respectively. Specifically, the projections of the at least one sub-light-emitting unit and the first electrode 120 on the substrate at least partially overlap, and the projections of the at least one sub-light-emitting unit and the second electrode 130 on the substrate at least partially overlap.

[0129] In this embodiment, a first sub-light-emitting unit 111, a first electrode 120, and a second electrode 130 are electrically connected in sequence to form a sequentially connected series structure.

[0130] Specifically, any one of methods such as evaporation, sputtering, chemical vapor deposition, electrochemical method, spin coating, inkjet printing, or radiative heat transfer can be used to form the at least one sub-light-emitting unit.

[0131] In one embodiment, the at least one sub-light-emitting unit is formed on the first electrode 120 and the second electrode 130.

[0132] In one embodiment, the at least one sub-light-emitting unit is formed on the first electrode 120 and the second electrode 130 by evaporation. A fine metal mask is used to make the at least one sub-light-emitting unit form a predetermined shape and is formed at a predetermined position above the first electrode 120 and the second electrode 130. For example, one sub-light-emitting unit is formed on the first electrode 120 and the second electrode 130.

[0133] Another embodiment of the present application provides a manufacturing method of a display panel. The structure of the display panel can refer to Figure 6 ... The difference between the manufacturing method of the display panel in this embodiment and the previous embodiment is that it further includes the following steps:

[0134] Form a series structure 150, and the series structure 150 is used to connect at least two sub-light-emitting units in series. Further, the series structure 150 is a charge light-emitting layer.

[0135] This step can be executed before or after forming the sub-light-emitting unit. Specifically, part of the series structure 150 is formed on the sub-light-emitting unit, and part of the series structure 150 is formed on the substrate.

[0136] Refer to Figure 8 ... The at least one sub-light-emitting unit includes a first sub-light-emitting unit 111, a third sub-light-emitting unit 113, a fourth sub-light-emitting unit 114, and a second light-emitting sub-unit. The series structure 150 includes a first series layer 151, a second series layer 152, and a third series layer 153.

[0137] In one implementation, the manufacturing method of the display panel includes the following steps:

[0138] Step S1110: Provide a substrate.

[0139] Step S1120: Form a first electrode 120, a second series layer 152, and a second electrode 130 that are arranged at intervals in the horizontal direction on one side of the substrate.

[0140] Step S1130: Form a first sub-light-emitting unit 111, a third sub-light-emitting unit 113, a fourth sub-light-emitting unit 114, and a second sub-light-emitting unit 112 that are arranged at intervals in the horizontal direction on the side of the first electrode 120 away from the substrate.

[0141] Specifically, form the first sub-light-emitting unit 111 on the first electrode 120, form the third sub-light-emitting unit 113 on the second series layer 152, form the fourth sub-light-emitting unit 114 on the second series layer 152, and form the second sub-light-emitting unit 112 on the second electrode 130.

[0142] Step S1140: Form a first series layer 151 on the side of the first sub-light-emitting unit 111 and the third sub-light-emitting unit 113 away from the substrate.

[0143] Step S1150: Form a third series layer 153 on the side of the fourth sub-light-emitting unit 114 and the second sub-light-emitting unit 112 away from the substrate.

[0144] It should be understood that the steps or operations in the above manufacturing method are only examples. In the embodiments of the present application, other operations or variations of each operation can also be performed. Or, not all steps need to be performed. Or, these steps can be performed in other orders.

[0145] The manufacturing method of the display panel provided by any embodiment of the present application and the display panel provided by the embodiments of the present application belong to the same inventive concept, and have corresponding film layer structures and beneficial effects. Details not described in detail in the embodiments of the manufacturing method of the display panel can be found in the embodiment part of the display panel, and will not be repeated here.

[0146] The simple layered structure described is exemplary, and it should be understood that the embodiments of the present application can be combined with various other structures. The specific materials and structures described in the present application are essentially exemplary, and other materials and structures can be used. Functional organic light-emitting diodes can be obtained by combining the various layers in different ways, or some layers can be completely omitted based on design, performance, and cost factors. Other layers not specifically described can also be included. Materials other than those specifically described can be used. Although many examples provided herein describe the various layers as including a single material, it should be understood that combinations of materials can be used, such as mixtures of hosts and dopants, or more generally, mixtures. In addition, the layers can have various sub-layers.

[0147] Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably therewith. As used herein, the words "or" and "and" mean "and / or", and can be used interchangeably therewith, unless the context clearly indicates otherwise. As used herein, the phrase "such as" means "such as but not limited to", and can be used interchangeably therewith. It should also be noted that in the devices, equipment, and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations shall be regarded as equivalent solutions of the present application.

[0148] In the drawings, for clarity, the thicknesses of layers, films, panels, regions, etc. are enlarged. Throughout the specification, like reference numerals represent like elements. It should be understood that when an element, such as a layer, film, region, or substrate, is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements.

[0149] It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Thus, without departing from the teachings herein, the "first element", "component", "region", "layer", or "part" discussed below may be referred to as a second element, component, region, layer, or part.

[0150] The terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms, including "at least one", unless the context clearly indicates otherwise. "At least one" should not be construed as limiting "one". "Or" means "and / or". As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0151] It should be understood that when the term "comprising" or "including" is used in this specification, it indicates the presence of the stated features, regions, wholes, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, regions, wholes, steps, operations, elements, components, and / or their combinations.

[0152] As used herein, "about" or "approximately" includes within the acceptable deviation for a particular value as determined by one of ordinary skill in the art in view of the measurements discussed and the error associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within a range of ±10% or 5%.

[0153] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of this disclosure and the relevant art, and will not be interpreted in an idealized or overly formal sense unless clearly so defined herein.

[0154] Exemplary embodiments are described herein with reference to cross-sectional views that are schematic illustrations of idealized embodiments. Thus, deviations from the shape of the figures as a result of, for example, manufacturing techniques and / or tolerances are to be expected. Accordingly, the embodiments described herein should not be construed as limited to the particular shapes of regions shown herein, but include deviations in shape that result, for example, from manufacturing. For example, regions illustrated or described as flat may typically have rough and / or non-linear features. Additionally, sharp corners shown may be rounded. Thus, the regions shown in the figures are schematic in nature, and their shapes are not intended to represent the exact shape of the illustrated regions and are not intended to limit the scope of the claims.

[0155] As used herein, the term "transparent" refers to having a transmittance such that light having a predetermined wavelength (e.g., light emitted from a quantum dot) has a transmittance of greater than or equal to about 85%, or for example greater than or equal to about 88%, greater than or equal to about 90%, greater than or equal to about 95%, greater than or equal to about 97%, or greater than or equal to about 99%, such as from about 85% to about 99.99% or from about 90% to about 99.9%.

[0156] The foregoing description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Thus, the present application is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0157] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A display panel, characterized in that, include: substrate; A light-emitting functional layer is located on one side of the substrate, and the light-emitting functional layer includes a plurality of sub-light-emitting units arranged at intervals and a series structure; a first electrode and a second electrode electrically connected to at least one sub-light-emitting unit, the first electrode and the second electrode being disposed on the same side of the sub-light-emitting unit and spaced apart, the orthographic projections of the first electrode and the second electrode on the substrate being staggered, the first electrode being an anode, the second electrode being a cathode, and the second electrode being thicker than the first electrode; as well as an insulating layer, disposed in a gap between the adjacent first electrode and the second electrode, wherein the insulating layer is made of a reflective pixel-defining structure; Wherein, the display panel includes at least one of a curved display area, an edge display area, and a bent display area, the at least one sub-light-emitting unit is arranged in at least one of the curved display area, the edge display area, and the bent display area, the sub-light-emitting unit includes a first sub-light-emitting unit, a second sub-light-emitting unit, a third sub-light-emitting unit, and a fourth sub-light-emitting unit, the series structure includes a first series layer, a second series layer, and a third series layer, the first series layer and the third series layer are respectively located on the side of the at least one sub-light-emitting unit away from the substrate, the first electrode, the second series layer, and the second electrode are respectively located on the side of the at least one sub-light-emitting unit close to the substrate, the first sub-light-emitting unit is arranged between the first series layer and the first electrode, the second sub-light-emitting unit is arranged between the third series layer and the second electrode, the third sub-light-emitting unit is arranged between the first series layer and the second series layer, and the fourth sub-light-emitting unit is arranged between the third series layer and the second series layer.

2. The display panel according to claim 1, wherein The tandem structure is a charge generation layer.

3. The display panel according to claim 1, wherein The first sub-light emitting unit, the second sub-light emitting unit, the third sub-light emitting unit and the fourth sub-light emitting unit have at least three colors.

4. The display panel according to claim 1, wherein The thickness of the second electrode is 10 nm to 100 nm.

5. The display panel according to claim 4, wherein The thickness of the second electrode is 50 nm-100 nm.

6. A display device, characterized in that, include: The display panel according to any one of claims 1 to 5.

Images