Display panel, preparation method thereof and display device

Abstract

The embodiment of the invention provides a display panel, a preparation method thereof and a display device. Light-emitting elements in the display panel comprise a first light-emitting element and a second light-emitting element which are different in light-emitting color. The first light-emitting element comprises a first anode layer, a first light-emitting layer and a first cathode layer, and the first anode layer is located on one side of the substrate; the second light-emitting element comprises a second anode layer, a second light-emitting layer and a second cathode layer, and the second anode layer is located on one side of the substrate; wherein in the thickness direction of the display panel, the thickness of the first anode layer is h1, the distance from the surface of the side, away from the substrate, of the first anode layer to the substrate is S1, the thickness of the second anode layer is h2, the distance from the surface of the side, away from the substrate, of the second anode layer to the substrate is S2, and h1 is smaller than h2, and S1-S2 / S2 is smaller than or equal to 0.2. By adopting the display panel provided by the embodiment of the invention, the flatness of the first cathode layer and the second cathode layer can be ensured, the voltage drop of the first cathode layer and the second cathode layer can be reduced, and the power consumption of a light-emitting element in the display panel can be reduced.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display panel, and particularly relate to a display panel, a preparation method thereof and a display device. BACKGROUND

[0002] With the continuous development of display technology, display panels have been widely used in people's production and life. In order to better meet people's needs, the film layer structure in the display panel can be adjusted in detail, so as to improve the display brightness of the display panel and ensure the display effect of the display panel. SUMMARY

[0003] Embodiments of the present application provide a display panel, a preparation method thereof and a display device. By adjusting the thickness and position of the anode layer in the light emitting element, the flatness of the cathode layer in the light emitting element can be ensured, the voltage drop of the cathode layer can be reduced, the power consumption of the light emitting element in the display panel can be reduced, and the working efficiency of the display panel can be improved.

[0004] In a first aspect, embodiments of the present application provide a display panel, comprising a substrate and a light emitting element located on one side of the substrate;

[0005] The light emitting element comprises first and second light emitting elements with different light emitting colors;

[0006] The first light emitting element comprises a first anode layer, a first light emitting layer and a first cathode layer. The first anode layer is located on one side of the substrate. The first light emitting layer is located on a side of the first anode layer away from the substrate. The first cathode layer is located on a side of the first light emitting layer away from the first anode layer. The second light emitting element comprises a second anode layer, a second light emitting layer and a second cathode layer. The second anode layer is located on one side of the substrate. The second light emitting layer is located on a side of the second anode layer away from the substrate. The second cathode layer is located on a side of the second light emitting layer away from the second anode layer.

[0007] Wherein, along the thickness direction of the display panel, the thickness of the first anode layer is h1, the distance from the surface of the first anode layer away from the substrate to the substrate is S1, the thickness of the second anode layer is h2, and the distance from the surface of the second anode layer away from the substrate to the substrate is S2, satisfying h1

[0008] Optionally, the substrate comprises a pixel circuit, and the pixel circuit comprises a first pixel circuit.

[0009] The display panel further comprises a pixel definition layer, the pixel definition layer comprises a first pixel definition part, the first pixel definition part is located on a side of the first anode layer close to the substrate, the first pixel definition part comprises a first via, and the first anode layer is electrically connected with the first pixel circuit through the first via.

[0010] Among them, along the thickness direction of the display panel, the thickness of the first pixel definition part is h3, and h3+h1=S1 is satisfied.

[0011] Optionally, the pixel circuit further comprises a second pixel circuit.

[0012] The second anode layer is arranged in close contact with the substrate; and h2=S2 is satisfied.

[0013] Optionally, the pixel circuit further comprises a second pixel circuit.

[0014] The pixel definition structure comprises a second pixel definition part, the second pixel definition part is located on a side of the second anode layer close to the substrate, the second pixel definition part comprises a second via, and the second anode layer is electrically connected with the second pixel circuit through the second via.

[0015] Among them, along the thickness direction of the display panel, the thickness of the second pixel definition part is h4, and h4+h2=S2 is satisfied.

[0016] Optionally, the first anode layer comprises a first reflective electrode and a first transparent electrode, the first reflective electrode is located on a side of the first transparent electrode close to the substrate; and the second anode layer comprises a second reflective electrode and a second transparent electrode, the second reflective electrode is located on a side of the second transparent electrode close to the substrate.

[0017] Among them, along the thickness direction of the display panel, the thickness of the first reflective electrode is h11, the thickness of the first transparent electrode is h12, the thickness of the second reflective electrode is h21, and the thickness of the second transparent electrode is h22; and h11=h21 and h12

[0018] Optionally, the pixel definition structure comprises a third pixel definition part, the third pixel definition is located between the first anode layer and the second anode layer in the projection of the substrate.

[0019] Among them, the distance from the surface of the third pixel definition part away from the substrate to the substrate is S3, and |S1-S3| / S3≤0.2 and |S2-S3| / S3≤0.2 are satisfied.

[0020] Optionally, the pixel defining structure comprises a fourth pixel defining part, a projection of the fourth pixel defining part on the substrate is located between a projection of the first anode layer on the substrate and a projection of the second anode layer on the substrate.

[0021] wherein a distance from a surface of the fourth pixel defining part away from the substrate to the substrate is S4, S1 < S4, S2 < S4 are satisfied; along a thickness direction of the display panel, a thickness of the first light emitting layer is n1, and a thickness of the second light emitting layer is n2, n1 + S1 = S4, n2 + S2 = S4 are satisfied.

[0022] Optionally, an out-lighting wavelength of the first light emitting element is smaller than an out-lighting wavelength of the second light emitting element.

[0023] In a second aspect, an embodiment of the present application provides a preparation method of a display panel, used for preparing the display panel in any one of the first aspect, the preparation method comprising:

[0024] providing a substrate;

[0025] preparing a first light emitting element and a second light emitting element on one side of the substrate; the first light emitting element comprises a first anode layer, a first light emitting layer and a first cathode layer, the first anode layer is located on one side of the substrate, the first light emitting layer is located on a side of the first anode layer away from the substrate, and the first cathode layer is located on a side of the first light emitting layer away from the first anode layer; the second light emitting element comprises a second anode layer, a second light emitting layer and a second cathode layer, the second anode layer is located on one side of the substrate, the second light emitting layer is located on a side of the second anode layer away from the substrate, and the second cathode layer is located on a side of the second light emitting layer away from the second anode layer; wherein along a thickness direction of the substrate, a thickness of the first anode layer is h1, a distance from a surface of the first anode layer away from the substrate to the substrate is S1, a thickness of the second anode layer is h2, and a distance from a surface of the second anode layer away from the substrate to the substrate is S2, h1 < h2, |S1-S2| / S2 ≤ 0.2 are satisfied.

[0026] In a third aspect, an embodiment of the present application provides a display device, comprising the display panel in any one of the first aspect.

[0027] The embodiment of the present application provides a display panel, and the light emitting element in the display panel comprises first light emitting elements and second light emitting elements with different light emitting colors; the first light emitting element comprises a first anode layer, a first light emitting layer and a first cathode layer, and the first anode layer is located on one side of a substrate; the second light emitting element comprises a second anode layer, a second light emitting layer and a second cathode layer, and the second anode layer is located on one side of the substrate; wherein, along the thickness direction of the display panel, the thickness of the first anode layer is h1, the distance from the surface of the first anode layer away from the substrate to the substrate is S1, the thickness of the second anode layer is h2, and the distance from the surface of the second anode layer away from the substrate to the substrate is S2, and h1 < h2 and |S1-S2| / S2≤0.2 are met. The display panel provided by the embodiment of the present application can guarantee the flatness of the first cathode layer and the second cathode layer, can reduce the pressure drop of the first cathode layer and the second cathode layer, that is, by adjusting the thickness and position of the anode layer in the light emitting element, the flatness of the cathode layer in the light emitting element as a whole can be guaranteed, the pressure drop of the cathode layer can be reduced, the power consumption of the light emitting element in the display panel can be reduced, and the working efficiency of the display panel can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art according to the contents of the embodiments of the present application and the drawings without creative labor.

[0029] Figure 1 is a structural schematic diagram of a display panel provided by the embodiment of the present application;

[0030] Figure 2 is a structural schematic diagram of another display panel provided by the embodiment of the present application;

[0031] Figure 3 is Figure 1 is an enlarged schematic diagram of a region C1 in FIG. 1;

[0032] Figure 4 is Figure 2 is an enlarged schematic diagram of a region C2 in FIG. 1;

[0033] Figure 5 is a structural schematic diagram of another display panel provided by the embodiment of the present application;

[0034] Figure 6 is a preparation flow schematic diagram of a display panel provided by the embodiment of the present application;

[0035] Figure 7 is a preparation process schematic diagram of a display panel provided by the embodiment of the present application;

[0036] Figure 8 is a structural schematic diagram of a display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0037] The present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the present application and are not limiting of the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings for the purpose of description.

[0038] In the description of the present application, unless explicitly defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless explicitly defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the present embodiment, the terms "up", "down" and "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the purpose of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.

[0041] Figure 1 is a structural schematic diagram of a display panel provided by an embodiment of the present application, Figure 2 is a structural schematic diagram of another display panel provided by an embodiment of the present application, with reference to Figure 1 and Figure 2As shown, an embodiment of the present invention provides a display panel 10, which includes a substrate 100 and light-emitting elements 200 located on one side of the substrate 100. The light-emitting elements 200 include a first light-emitting element 210 and a second light-emitting element 220 with different emitting colors. The first light-emitting element 210 includes a first anode layer 210a, a first light-emitting layer 210b, and a first cathode layer 210c. The first anode layer 210a is located on one side of the substrate 100, the first light-emitting layer 210b is located on the side of the first anode layer 210a away from the substrate 100, and the first cathode layer 210c is located on the side of the first light-emitting layer 210b away from the first anode layer 210a. The second light-emitting element 220 includes a second anode layer 220a, a second light-emitting layer 220b, and a second light-emitting layer 220c. The first anode layer 220b and the second cathode layer 220c are located on one side of the substrate 100, the second light-emitting layer 220b is located on the side of the second anode layer 220a away from the substrate 100, and the second cathode layer 220c is located on the side of the second light-emitting layer 220b away from the second anode layer 220a. Along the thickness direction of the display panel 10, the thickness of the first anode layer 210a is h1, the distance from the surface of the first anode layer 210a away from the substrate 100 to the substrate 100 is S1, the thickness of the second anode layer 220a is h2, and the distance from the surface of the second anode layer 220a away from the substrate 100 to the substrate 100 is S2, satisfying h1 < h2 and |S1-S2| / S2 ≤ 0.2.

[0042] Among them, reference Figure 1 and Figure 2 As shown, the display panel 10 includes a substrate 100 and a plurality of light-emitting elements 200 disposed on one side of the substrate 100. The display function of the display panel 10 can be realized by driving the light-emitting elements 200 to emit light. For example, different light-emitting elements 200 can emit light of different colors, such as red light-emitting elements emitting red light, green light-emitting elements emitting green light, and blue light-emitting elements emitting blue light, thus realizing the color display effect of the display panel 10.

[0043] Further, the light-emitting element 200 includes a first light-emitting element 210 and a second light-emitting element 220 having different light-emitting colors, wherein the first light-emitting element 210 includes a first anode layer 210a, a first light-emitting layer 210b and a first cathode layer 210c stacked along the thickness direction of the display panel 10, wherein the first light-emitting layer 210b can include multiple layers of light-emitting material layers, which can be specifically a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, an electron transport layer, a hole blocking layer and an electron injection layer, etc., but not limited thereto. Alternatively, the light-emitting structure can also include a charge generation layer, such as a P-type charge generation layer and an N-type charge generation layer. When a voltage is applied to the first anode layer 210a and the first cathode layer 210c respectively, holes passing through the hole transport layer and electrons passing through the electron transport layer move to the light-emitting layer to form excitons, resulting in the emission of visible light from the light-emitting layer, thereby realizing the display function of the display panel 10. Similarly, the second light-emitting element 220 includes a second anode layer 220a, a second light-emitting layer 220b and a second cathode layer 220c stacked along the thickness direction of the display panel 10, wherein the second light-emitting layer 220b also includes multiple layers of light-emitting material layers, which can be specifically a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, an electron transport layer, a hole blocking layer and an electron injection layer, etc., but not limited thereto. Alternatively, the light-emitting structure can also include a charge generation layer, such as a P-type charge generation layer and an N-type charge generation layer. When a voltage is applied to the second anode layer 220a and the second cathode layer 220c respectively, holes passing through the hole transport layer and electrons passing through the electron transport layer move to the light-emitting layer to form excitons, resulting in the emission of visible light from the light-emitting layer, thereby realizing the display function of the display panel 10.

[0044] Further, the light emitting element 200 emitting different light lines can adaptively adjust the thickness of the corresponding anode layer, ensure that the thickness between the cathode layer and the anode layer in the light emitting element 200 is different, and realize the adjustment of different light emitting effects. Specifically, the light lines emitted by different light emitting elements are different in wavelength, and the distance between the anode layer and the cathode layer can be adaptively adjusted according to the emitted light wavelength of the corresponding light emitting element to realize microcavity modulation and improve the light emitting effect of the light emitting element 200. For example, if the wavelength of the light line emitted by the first light emitting element 210 is λ1, and the distance between the first anode layer 210a and the first cathode layer 210c along the thickness direction of the display panel 10 is L1, then by adjusting the value of L1, when the adjusted L1 satisfies: L1=n×(λ1 / 2), n is a positive integer, then the cavity length of the microcavity structure formed by the first anode layer 210a and the first cathode layer 210c in the adjusted first light emitting element 210 satisfies the half integer multiple of the light emitting wavelength of the first light emitting element 210, and the light emitting effect of the first light emitting element 210 can be improved. Similarly, if the wavelength of the light line emitted by the second light emitting element 220 is λ2, and the distance between the second anode layer 220a and the second cathode layer 220c along the thickness direction of the display panel 10 is L2, then by adjusting the value of L2, when the adjusted L2 satisfies: L2=n×(λ2 / 2), n is a positive integer, then the cavity length of the microcavity structure formed by the second anode layer 220a and the second cathode layer 220c in the adjusted second light emitting element 220 satisfies the half integer multiple of the light emitting wavelength of the second light emitting element 220, and the light emitting effect of the second light emitting element 220 can be improved.

[0045] Specifically, the thickness of the first anode layer 210a can be adaptively adjusted according to the light emitting wavelength of the first light emitting element 210 to realize the distance between the first anode layer 210a and the first cathode layer 210c in accordance with the microcavity modulation, and realize the adjustment of the light emitting effect of the first light emitting element 210. Similarly, the thickness of the second anode layer 220a can be adaptively adjusted according to the light emitting wavelength of the second light emitting element 220 to realize the distance between the second anode layer 220a and the second cathode layer 220c in accordance with the microcavity modulation, and realize the adjustment of the light emitting effect of the second light emitting element 220.

[0046] Specifically, referring to Figure 1 and Figure 2As shown, the thickness of the first anode layer 210a in the first light emitting element 210 along the thickness direction of the display panel 10 is h1, and the thickness of the second anode layer 220a in the second light emitting element 220 along the thickness direction of the display panel 10 is h2. Since the light emitting wavelengths of the first light emitting element 210 and the second light emitting element 220 are different, in order to ensure that the first light emitting element 210 and the second light emitting element 220 are microcavity modulated at the same time, the values of h1 and h2 can be modulated to be different. Specifically, h1 < h2.

[0047] It should be noted that the light emitting element 200 provided on the substrate 100 of the display panel 10 has a variety of arrangement modes, and the embodiments of the present application do not illustrate them one by one. For example, referring to Figure 1 and Figure 2 three light emitting elements are illustrated, and referring to Figure 1 As shown, the first light emitting element 210 is the leftmost light emitting element 200 of the three light emitting elements 200 shown, and the second light emitting element 220 is the middle light emitting element 200 of the three light emitting elements 200 shown. Referring to Figure 1 As shown, the second light emitting element 220 is the rightmost light emitting element 200 of the three light emitting elements 200 shown, and the first light emitting element 210 is the middle light emitting element 200 of the three light emitting elements 200 shown.

[0048] Further, the first cathode layer 210c is located on the side of the first light emitting layer 210b away from the first anode layer 210a, and the second cathode layer 220c is located on the side of the second light emitting layer 220b away from the second anode layer 220a. Since the cathode layer of the light emitting element 200 in the display panel 10 can be prepared as a whole, the first cathode layer 210c and the second cathode layer 220c can be understood as a cathode structure provided as a whole.

[0049] As described above, in order to ensure that the first light emitting element 210 and the second light emitting element 220 have good light emitting effects, the first anode layer 210a and the second anode layer 220a are set to have different thicknesses. However, in order to ensure the flatness of the subsequently formed cathode structure, the distance from the first anode layer 210a to the substrate 100 and the distance from the second anode layer 220a to the substrate 100 can be adjusted. Specifically, the distance from the surface of the first anode layer 210a away from the substrate 100 to the substrate 100 is S1, and the distance from the surface of the second anode layer 220a away from the substrate 100 to the substrate 100 is S2, and |S1-S2| / S2≤0.2 is satisfied, that is, the values of S1 and S2 are the same or similar, so that the distance from the first cathode layer 210c and the second cathode layer 220c to the substrate 100 is basically the same, the flatness of the cathode layer is ensured, the voltage drop of the cathode layer in the light emitting element 200 is reduced, the power consumption of the light emitting element 200 in the display panel 10 is reduced, and the overall working efficiency of the display panel 10 is improved.

[0050] For example, since the thickness of the first anode layer 210a is less than the thickness of the second anode layer 220a (i.e., h1 Figure 1 As shown in region A, the first anode layer 210a and the second anode layer 220a are respectively raised, and the degree of raising is different, so that the surface of the first anode layer 210a away from the substrate 100 is basically flush with the surface of the second anode layer 220a away from the substrate 100. Figure 2 As shown in region B, the first anode layer 210a is raised, so that the surface of the first anode layer 210a away from the substrate 100 is basically flush with the surface of the second anode layer 220a away from the substrate 100.

[0051] Optionally, the light emitting wavelength of the first light emitting element 210 is less than the light emitting wavelength of the second light emitting element 220.

[0052] In this design, the emission wavelength of the first light-emitting element 210 is shorter than that of the second light-emitting element 220. The distances between the first anode layer 210a and the first cathode layer 210c, as well as the distances between the second anode layer 220a and the second cathode layer 220c, are adaptively adjusted according to the wavelength to ensure the luminous efficacy of both elements. Specifically, adjusting the distance between the first anode layer 210a and the first cathode layer 210c to be smaller than the distance between the second anode layer 220a and the second cathode layer 220c can be achieved by adjusting the thickness of the first anode layer 210a to be smaller than the thickness of the second anode layer 220a.

[0053] For example, the second light-emitting element 220 can be a red light-emitting element and the first light-emitting element 210 can be a green light-emitting element; or the second light-emitting element 220 can be a red light-emitting element and the first light-emitting element 210 can be a blue light-emitting element; or the second light-emitting element 220 can be a green light-emitting element and the first light-emitting element 210 can be a blue light-emitting element. The actual emitted color of different light-emitting elements can be adaptively adjusted according to actual needs, and the embodiments of the present invention do not impose specific limitations on this.

[0054] In summary, this invention provides a display panel in which the light-emitting elements include a first light-emitting element and a second light-emitting element with different emitting colors. The first light-emitting element includes a first anode layer, a first emitting layer, and a first cathode layer, with the first anode layer located on one side of the substrate. The second light-emitting element includes a second anode layer, a second emitting layer, and a second cathode layer, with the second anode layer located on one side of the substrate. Along the thickness direction of the display panel, the thickness of the first anode layer is h1, the distance from the surface of the first anode layer away from the substrate to the substrate is S1, the thickness of the second anode layer is h2, and the distance from the surface of the second anode layer away from the substrate to the substrate is S2, satisfying h1 < h2 and |S1-S2| / S2 ≤ 0.2. Using the display panel provided by this invention, the flatness of the first and second cathode layers can be guaranteed, and the voltage drop of the first and second cathode layers can be reduced. In other words, by adjusting the thickness and position of the anode layer in the light-emitting element, the overall flatness of the cathode layer in the light-emitting element can be guaranteed, the voltage drop of the cathode layer can be reduced, the power consumption of the light-emitting elements in the display panel can be reduced, and the working efficiency of the display panel can be improved.

[0055] Figure 3 yes Figure 1 An enlarged schematic diagram of region C1 in the middle. Figure 4 yes Figure 2 An enlarged schematic diagram of region C2 in the middle, for reference. Figures 1 to 4As shown, the substrate 100 includes a pixel circuit 110, which includes a first pixel circuit 111; the display panel 10 also includes a pixel defining layer 300, which includes a first pixel defining portion 310. The first pixel defining portion 310 is located on the side of the first anode layer 210a close to the substrate 100. The first pixel defining portion 310 includes a first via d1, and the first anode layer 210a is electrically connected to the first pixel circuit 111 through the first via d1. The thickness of the first pixel defining portion 310 along the thickness direction of the display panel 10 is h3, which satisfies h3 + h1 = S1.

[0056] Furthermore, the display panel 10 also includes a pixel defining layer 300, which includes a first pixel defining portion 310, as shown in the reference. Figure 3 and Figure 4 As shown, the first pixel defining portion 310 is located on the side of the first anode layer 210a closest to the substrate 100, and along the thickness direction of the display panel 10, the thickness of the first pixel defining portion 310 is h3, satisfying h3 + h1 = S1. In other words, by setting the first pixel defining portion 310, the first anode layer 210a is raised, compensating for the relatively small thickness of the first anode layer 210a along the thickness direction of the display panel 10, which helps ensure the flatness and continuity of the cathode layer disposed across the entire surface.

[0057] Among them, reference Figure 3 and Figure 4 As shown, the substrate 100 includes a multilayer film structure stacked along the thickness direction of the display panel 10. A pixel circuit 110 is also disposed in the substrate 100. The pixel circuit 110 is electrically connected to the light-emitting element 200 to drive the light-emitting element 200 and ensure the display effect of the display panel 10. Specifically, the pixel circuit 110 includes a first pixel circuit 111, which is electrically connected to the first anode layer 210a to drive the first light-emitting element 210. Optionally, refer to... Figure 3 and Figure 4 As shown, the first pixel circuit 110 includes multiple transistors 1111, each transistor 1111 including an active layer 103, a gate 104, a first connection terminal 105, and a second connection terminal 106, etc. The substrate 100 includes multiple insulating layers 102, with the active layer 103, gate 104, first connection terminal 105, and second connection terminal 106 located at different insulating layers 102. The specific configuration of the substrate 100 and the first pixel circuit 110 can be adaptively adjusted according to different display panels 10; however, this invention will not provide specific examples of each configuration.

[0058] Further reference Figures 1 to 4 As shown, please refer to the following for details. Figure 3 andFigure 4 As shown, the first pixel defining portion 310 includes a first via d1, which penetrates the first pixel defining portion 310. The first anode layer 210a can be electrically connected to the first pixel circuit 111 through the first via d1.

[0059] refer to Figure 2 and Figure 4 As shown, the pixel circuit 110 also includes a second pixel circuit 112; the second anode layer 220a is bonded to the substrate 100; and h2=S2 is satisfied.

[0060] Furthermore, since the first light-emitting element 210 and the second light-emitting element 220 emit light of different colors, different driving currents can be provided through different pixel circuits 110 to ensure the light-emitting effect of the first light-emitting element 210 and the second light-emitting element 220, and to ensure the overall display effect of the display panel 10. The pixel circuit 110 also includes a second pixel electrode 112, the arrangement of which is similar to that of the first pixel circuit 111, and will not be repeated here.

[0061] Further reference Figure 2 and Figure 4 As shown, please refer to the following for details. Figure 4 As shown, along the thickness direction of the display panel 10, the thicker second anode layer 220a can be bonded to the substrate 100, therefore h2=S2. Furthermore, the thickness of the first anode layer 210a can be adjusted according to the distance between the surface of the second anode layer 220a away from the substrate 100 and the substrate 100. By adjusting the bonding arrangement of the second anode layer 220a with the substrate 100, the overall thickness of the display panel 10 can be effectively reduced, which is beneficial for achieving a thinner design of the display panel 10.

[0062] refer to Figure 1 and Figure 3 As shown, the pixel circuit 110 further includes a second pixel circuit 112; the pixel defining structure 300 includes a second pixel defining portion 320, which is located on the side of the second anode layer 220a near the substrate 100. The second pixel defining portion 320 includes a second via d2, and the second anode layer 220a is electrically connected to the second pixel circuit 112 through the second via d2. The thickness of the second pixel defining portion 320 along the thickness direction of the display panel 10 is h4, which satisfies h4 + h2 = S2.

[0063] Further, since the first light emitting element 210 and the second light emitting element 220 emit light rays of different colors, different driving currents can be provided by different pixel circuits 110 to ensure the light emitting effect of the first light emitting element 210 and the second light emitting element 220 and the display effect of the display panel 10 as a whole. The pixel circuit 110 further includes a second pixel electrode 112, which is arranged in a similar manner to the first pixel circuit 111 and will not be repeated here.

[0064] Further, the pixel limiting layer 300 includes a second pixel limiting portion 320, as shown in Figure 1 and Figure 3 The second pixel limiting portion 320 is located on the side of the second anode layer 220a close to the substrate 100, and along the thickness direction of the display panel 10, the thickness of the second pixel limiting portion 320 is h4, which satisfies h4+h2=S2. That is, by setting the second pixel limiting portion 320, the second anode layer 220a is raised, and the height of the second anode layer 220a with relatively small thickness is compensated along the thickness direction of the display panel 10, which is conducive to ensuring the flatness and continuity of the cathode layer arranged on the whole surface.

[0065] Further, as shown in Figure 2 The second pixel limiting portion 320 includes a second via d2, the second via d2 penetrates the second pixel limiting portion 320, and the second anode layer 220a can be electrically connected to the second pixel circuit 112 through the second via d2.

[0066] As shown in Figures 1 to 4 The first anode layer 210a includes a first reflective electrode 210a1 and a first transparent electrode 210a2, and the first reflective electrode 210a1 is located on the side of the first transparent electrode 210a2 close to the substrate 100; the second anode layer 220a includes a second reflective electrode 220a1 and a second transparent electrode 220a2, and the second reflective electrode 220a1 is located on the side of the second transparent electrode 220a2 close to the substrate 100; along the thickness direction of the display panel 10, the thickness of the first reflective electrode 210a1 is h11, the thickness of the first transparent electrode 210a2 is h12, the thickness of the second reflective electrode 220a1 is h21, and the thickness of the second transparent electrode 220a2 is h22; h11=h21, and h12<h22.

[0067] Specifically, as shown in Figures 1 to 4As shown, the first anode layer 210a includes a first reflective electrode 210a1 and a first transparent electrode 210a2 arranged in a stack, wherein the first reflective electrode 210a1 is located on the side of the first transparent electrode 210a2 close to the substrate 100. The first reflective electrode 210a1 can be understood as mainly used to realize the path adjustment of the generated light in the first light emitting element 210, such as reflection, etc., and the first transparent electrode 210a2 is used to realize the thickness adjustment of the first anode layer 210a. Similarly, referring to Figures 1 to 4 As shown, the second anode layer 220a includes a second reflective electrode 220a1 and a second transparent electrode 220a2 arranged in a stack, wherein the second reflective electrode 220a1 is located on the side of the second transparent electrode 220a2 close to the substrate 100. The second reflective electrode 220a1 can be understood as mainly used to realize the path adjustment of the generated light in the second light emitting element 220, such as reflection, etc., and the second transparent electrode 220a2 is used to realize the thickness adjustment of the second anode layer 220a.

[0068] Specifically, referring to Figures 1 to 4 As shown, specifically referring to Figure 4 As shown, along the thickness direction of the display panel 10, the thickness of the first reflective electrode 210a1 is h11, and the thickness of the second reflective electrode 220a1 is h21, satisfying h11=h21. While along the thickness direction of the display panel 10, the thickness of the first transparent electrode 210a2 is h12, and the thickness of the second transparent electrode 220a2 is h22, satisfying h12

[0069] Referring to Figures 1 to 4 As shown, the pixel defining structure 300 includes a third pixel defining part 330, and the orthographic projection of the third pixel defining part 330 on the substrate 100 is located between the orthographic projection of the first anode layer 210a on the substrate 100 and the orthographic projection of the second anode layer 220a on the substrate 100; wherein the distance from the surface of the third pixel defining part 330 away from the substrate 100 to the substrate 100 is S3, satisfying |S1-S3| / S3≤0.2, |S2-S3| / S3≤0.2.

[0070] Wherein, referring to Figures 1 to 4 As shown, specifically referring to Figure 3 And Figure 4As shown, the pixel defining structure 300 comprises a third pixel defining part 330, and the third pixel defining part 330 is located between the normal projection of the first anode layer 210a on the substrate 100 and the normal projection of the second anode layer 220a on the substrate 100. In other words, the third pixel defining part 330 is used to separate the adjacent first anode layer 210a and the second anode layer 220a, avoid short circuit between different light emitting elements 200, ensure normal light emitting display of different light emitting elements 200 in the display panel 10, and ensure the display function of the display panel 10.

[0071] Further, referring to Figures 1 to 4 As shown, referring to Figure 3 and Figure 4 As shown, the distance from the surface of the third pixel defining part 330 away from the substrate 100 to the substrate 100 is S3, and satisfies |S1-S3| / S3≤0.2, that is, the numerical value of S1 and S3 is the same or similar. In other words, the surface of the third pixel defining part 330 away from the substrate 100 is arranged flush or nearly flush with the surface of the first anode layer 210a away from the substrate 100. Meanwhile, satisfies |S2-S3| / S3≤0.2, that is, the numerical value of S2 and S3 is the same or similar. In other words, the surface of the third pixel defining part 330 away from the substrate 100 is arranged flush or nearly flush with the surface of the second anode layer 220a away from the substrate 100. Therefore, the surface of the film layer where the first light emitting layer 210b and the second light emitting layer 220b are arranged is also arranged substantially flush, further ensuring the flatness of the film layer where the first cathode layer 210c and the second cathode layer 220c are arranged, ensuring the flatness of the cathode layer arranged on the whole surface, reducing the voltage drop of the cathode layer, ensuring the light emitting effect of the light emitting element 200 in the display panel 10, and improving the working efficiency of the display panel 10.

[0072] It should be noted that, referring to Figures 1 to 4 As shown, the first pixel part 310, the second pixel part 320 and the third pixel part 330 are an integral structure, Figure 3 and Figure 4 In the area division by the dashed line in the display panel 10, the first pixel part 310, the second pixel part 320 and the third pixel part 330 are integrally prepared.

[0073] Figure 5 is another structure schematic diagram of a display panel provided by the embodiment of the present application, referring to Figure 5As shown, the pixel defining structure 300 includes a fourth pixel defining portion 340. The orthographic projection of the fourth pixel defining portion 340 onto the substrate 100 is located between the orthographic projection of the first anode layer 210a onto the substrate 100 and the orthographic projection of the second anode layer 220a onto the substrate 100. The distance from the surface of the fourth pixel defining portion 340 away from the substrate 100 to the substrate 100 is S4, satisfying S1 < S4 and S2 < S4. Along the thickness direction of the display panel 10, the thickness of the first light-emitting layer 210b is n1, and the thickness of the second light-emitting layer 220b is n2, satisfying n1 + S1 = S4 and n2 + S2 = S4.

[0074] Among them, reference Figure 5 As shown, the pixel-defining structure 300 includes a fourth pixel-defining portion 340, and the orthographic projection of the fourth pixel-defining portion 340 onto the substrate 100 is located between the orthographic projections of the first anode layer 210a onto the substrate 100 and the second anode layer 220a onto the substrate 100. In other words, the fourth pixel-defining portion 340 is used to separate adjacent first anode layers 210a and second anode layers 220a, preventing short circuits between different light-emitting elements 200, ensuring normal light emission and display of different light-emitting elements 200 in the display panel 10, and ensuring the display function of the display panel 10. It should be noted that... Figure 5 The following example illustrates the concept of light-emitting element 210 on the left and light-emitting element 220 in the middle of the diagram.

[0075] Further reference Figure 5 As shown, the distance from the surface of the fourth pixel defining portion 340 away from the substrate 100 to the substrate 100 is S4, satisfying S1 < S4, meaning that the distance from the surface of the fourth pixel defining portion 340 away from the substrate 100 to the substrate 100 is greater than the distance from the surface of the first anode layer 210a away from the substrate 100 to the substrate 100. Simultaneously, it also satisfies S2 < S4, meaning that the distance from the surface of the fourth pixel defining portion 340 away from the substrate 100 to the substrate 100 is greater than the distance from the surface of the second anode layer 220a away from the substrate 100 to the substrate 100. In other words, the height of the fourth pixel defining portion 340 disposed between the first anode layer 210a and the second anode layer 220a exceeds both the surface of the first anode layer 210a and the surface of the second anode layer 220a.

[0076] Further reference Figure 5As shown, along the thickness direction of the display panel 10, the thickness of the first light-emitting layer 210b is n1, the thickness of the second light-emitting layer 220b is n2, and n1+S1=S4 and n2+S2=S4 are satisfied, that is, the thickness of the first light-emitting layer 210b and the thickness of the second light-emitting layer 220n are adjusted, so as to ensure the surface flatness of the first cathode layer 210c and the second cathode layer 220c, ensure the flatness of the cathode layer arranged on the whole surface, reduce the voltage drop of the cathode layer, ensure the light-emitting effect of the light-emitting element 200 in the display panel 10, and improve the working efficiency of the display panel 10.

[0077] In this way, by increasing the height of the fourth pixel defining part 340, the first light-emitting layer 210b is sunk into the groove formed by the fourth pixel defining part 340 and the first anode layer 210a, and the second light-emitting layer 220b is sunk into the groove formed by the fourth pixel defining part 340 and the second anode layer 210b, so as to avoid the crosstalk between light emitted by light-emitting elements 200 of different colors, and further improve the display effect of the display panel 10 as a whole.

[0078] It should be noted that, referring to Figure 5 As shown, the first pixel part 310, the second pixel part 320, and the fourth pixel part 340 are in an integrated structure, Figure 5 In the embodiment, the division of the regions is indicated by dashed lines, and the first pixel part 310, the second pixel part 320, and the fourth pixel part 340 are integrally prepared when the display panel 10 is prepared.

[0079] Based on the same inventive concept, the embodiment of the present application provides a preparation method of a display panel, Figure 6 is a preparation flow diagram of a display panel provided by the embodiment of the present application, referring to Figure 6 As shown, the preparation method comprises the following steps.

[0080] S110, providing a substrate.

[0081] The substrate is provided, and subsequent processes are performed on the substrate to prepare the light-emitting element.

[0082] Optionally, the substrate comprises a multilayer film layer structure arranged in layers, wherein the substrate further comprises a pixel circuit, and the pixel circuit is used to be electrically connected with the subsequently prepared light-emitting element, so as to drive the light-emitting element and ensure the display effect of the display panel. Specifically, the pixel circuit comprises a plurality of transistors, and the transistors comprise an active layer, a gate, a first connection end, and a second connection end, and the substrate comprises a plurality of insulating layers, and the active layer, the gate, the first connection end, and the second connection end are located at different insulating layers. For the specific arrangement of the substrate and the first pixel circuit, adaptive adjustment can be made according to different display panels, and the present application does not illustrate all of them.

[0083] S120, preparing a first light-emitting element and a second light-emitting element on one side of the substrate.

[0084] The display panel includes a plurality of light-emitting elements prepared on one side of the substrate, and the display panel can realize the display function by driving the light-emitting elements to emit light. For example, different light-emitting elements can emit light of different colors, such as red light-emitting elements emitting red light, green light-emitting elements emitting green light, and blue light-emitting elements emitting blue light, thereby realizing the color display effect of the display panel.

[0085] Further, the light-emitting element includes a first light-emitting element and a second light-emitting element with different light-emitting colors. The first light-emitting element includes a first anode layer, a first light-emitting layer, and a first cathode layer stacked along the thickness direction of the display panel. The first light-emitting layer can include multiple light-emitting material layers, which can be a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, an electron transport layer, a hole blocking layer, and an electron injection layer, but are not limited thereto. Alternatively, the light-emitting structure can also include a charge generation layer, such as a P-type charge generation layer and an N-type charge generation layer. When a voltage is applied to the first anode layer and the first cathode layer, respectively, holes passing through the hole transport layer and electrons passing through the electron transport layer move to the light-emitting layer to form excitons, causing visible light to be emitted from the light-emitting layer, thereby realizing the display function of the display panel. Similarly, the second light-emitting element includes a second anode layer, a second light-emitting layer, and a second cathode layer stacked along the thickness direction of the display panel. The second light-emitting layer also includes multiple light-emitting material layers, which can be a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, an electron transport layer, a hole blocking layer, and an electron injection layer, but are not limited thereto. Alternatively, the light-emitting structure can also include a charge generation layer, such as a P-type charge generation layer and an N-type charge generation layer. When a voltage is applied to the second anode layer and the second cathode layer, respectively, holes passing through the hole transport layer and electrons passing through the electron transport layer move to the light-emitting layer to form excitons, causing visible light to be emitted from the light-emitting layer, thereby realizing the display function of the display panel.

[0086] Further, the thickness of the anode layer corresponding to the light emitting element emitting different light can be adaptively adjusted to ensure that the thickness between the cathode layer and the anode layer in the light emitting element is different, and different light emitting effects can be achieved. Specifically, the wavelengths of light emitted by different light emitting elements are different, and the distance between the anode layer and the cathode layer corresponding to the light emitting element can be adaptively adjusted according to the wavelength of the light emitted by the light emitting element to achieve microcavity modulation and improve the light emitting effect of the light emitting element. For example, if the wavelength of the light emitted by the first light emitting element is λ1, and the distance between the first anode layer and the first cathode layer along the thickness direction of the display panel is L1, then by adjusting the value of L1, when the adjusted L1 satisfies L1 = n x (λ1 / 2), n is a positive integer, the cavity length of the microcavity structure formed by the first anode layer and the first cathode layer in the adjusted first light emitting element satisfies an integer multiple of half of the light emitting wavelength of the first light emitting element, and the light emitting effect of the first light emitting element can be improved by the constructive interference of part of the generated light in the microcavity structure. Similarly, if the wavelength of the light emitted by the second light emitting element is λ2, and the distance between the second anode layer and the second cathode layer along the thickness direction of the display panel is L2, then by adjusting the value of L2, when the adjusted L2 satisfies L2 = n x (λ2 / 2), n is a positive integer, the cavity length of the microcavity structure formed by the second anode layer and the second cathode layer in the adjusted second light emitting element satisfies an integer multiple of half of the light emitting wavelength of the second light emitting element, and the light emitting effect of the second light emitting element can be improved by the constructive interference of part of the generated light in the microcavity structure.

[0087] Specifically, the thickness of the first anode layer can be adaptively adjusted according to the light emitting wavelength of the first light emitting element to ensure that the distance between the first anode layer and the first cathode layer meets the microcavity modulation, and the light emitting effect of the first light emitting element can be adjusted. Similarly, the thickness of the second anode layer can be adaptively adjusted according to the light emitting wavelength of the second light emitting element to ensure that the distance between the second anode layer and the second cathode layer meets the microcavity modulation, and the light emitting effect of the second light emitting element can be adjusted.

[0088] Specifically, the thickness of the first anode layer along the thickness direction of the display panel in the first light emitting element is h1, and the thickness of the second anode layer along the thickness direction of the display panel in the second light emitting element is h2. Since the light emitting wavelengths of the first light emitting element and the second light emitting element are different, the values of h1 and h2 can be modulated to ensure that the first light emitting element and the second light emitting element are modulated by microcavity. Specifically, h1 < h2.

[0089] Further, the first cathode layer is located on the side of the first light-emitting layer away from the first anode layer, and the second cathode layer is located on the side of the second light-emitting layer away from the second anode layer. Since the cathode layer of the light-emitting element in the display panel can be prepared in an integral manner, the first cathode layer and the second cathode layer can be understood as a cathode structure arranged in an integral manner.

[0090] As described above, in order to ensure that the first light-emitting element and the second light-emitting element both have good light-emitting effects, the first anode layer and the second anode layer are provided with different thicknesses. However, in order to ensure the flatness of the cathode structure arranged in an integral manner, the distance from the first anode layer to the substrate and the distance from the second anode layer to the substrate can be adjusted. Specifically, the distance from the surface on the side of the first anode layer away from the substrate to the substrate is S1, and the distance from the surface on the side of the second anode layer away from the substrate to the substrate is S2, and |S1-S2| / S2≤0.2 is satisfied, that is, the numerical values of S1 and S2 are the same or similar, so that the distance from the first cathode layer and the second cathode layer arranged in an integral manner to the substrate is basically the same, the flatness of the cathode layer arranged in an integral manner is ensured, the voltage drop of the cathode layer in the light-emitting element is reduced, the power consumption of the light-emitting element in the display panel is reduced, and the overall working efficiency of the display panel is improved.

[0091] For example, since the thickness of the first anode layer is less than the thickness of the second anode layer (i.e., h1 Figure 1 As shown in region A, by respectively raising the first anode layer 210a and the second anode layer 220a, and the raising degrees of the two are different, the surface on the side of the first anode layer 210a away from the substrate 100 is basically flush with the surface on the side of the second anode layer 220a away from the substrate 100. Optionally, as shown in region B, by raising the first anode layer 210a, the surface on the side of the first anode layer 210a away from the substrate 100 is basically flush with the surface on the side of the second anode layer 220a away from the substrate 100. Figure 2

[0092] Optionally, the light-emitting wavelength of the first light-emitting element is less than the light-emitting wavelength of the second light-emitting element.

[0093] ​The light-emitting wavelength of the first light-emitting element is smaller than the light-emitting wavelength of the second light-emitting element, the distance between the first anode layer and the first cathode layer and the distance between the second anode layer and the second cathode layer are adaptively adjusted according to the size of the wavelength, so as to ensure the light-emitting effect of the first light-emitting element and the second light-emitting element. Specifically, the distance between the first anode layer and the first cathode layer is smaller than the distance between the second anode layer and the second cathode layer, and specifically, the thickness of the first anode layer can be smaller than the thickness of the second anode layer.

[0094] Optionally, the second light-emitting element can be a red light-emitting element, and the first light-emitting element can be a green light-emitting element; or the second light-emitting element can be a red light-emitting element, and the first light-emitting element can be a blue light-emitting element; or the second light-emitting element can be a green light-emitting element, and the first light-emitting element can be a blue light-emitting element. The actual light-emitting color of different light-emitting elements can be adaptively adjusted according to actual needs, and the present embodiment does not make specific limitations.

[0095] Optionally, Figure 7 is a preparation process schematic diagram of a display panel provided by the present embodiment, referring to Figure 7 Step a shown in FIG. 1, a substrate 100 is provided. Referring to Figure 7 Step b shown in FIG. 1, a pixel definition film layer 30 is prepared on one side of the substrate 100, and the material of the pixel definition film layer 30 can be silicon oxide. Referring to Figure 7 Steps c and d shown in FIG. 1, the pixel definition film layer 30 is patterned and etched, for example, through photoresist and mask, to form a pixel definition structure 300 with different thicknesses, which facilitates the different degrees of elevation of the anode layer in different light-emitting elements. Referring to Figure 7 Step e shown in FIG. 1, a first anode film layer 2100 and a second anode film layer 2200 are respectively prepared on the side of the pixel definition structure 300 away from the substrate 100, wherein the first anode film layer 2100 can form a reflective electrode in different light-emitting elements through subsequent etching process, for example, a first reflective electrode in the first light-emitting element and a second reflective electrode in the second light-emitting element; the second anode film layer 2200 can form a transparent electrode in different light-emitting elements through subsequent etching process, for example, a first transparent electrode in the first light-emitting element and a second transparent electrode in the second light-emitting element. Referring to Figure 7As shown in step f, the first anode film layer 2100 and the second anode film layer 2200 are patterned and etched by a photoresist and mask process to form the corresponding reflective electrode 2000a and the transparent electrode 2000b, wherein the reflective electrode 2100a includes the first reflective electrode in the first light emitting element and the second reflective electrode in the second light emitting element, and the transparent electrode 2100b includes the first transparent electrode in the first light emitting element and the second transparent electrode in the second light emitting element. In one aspect, the first anode film layer 2100 and the second anode film layer 2200 away from the substrate 100 side of the pixel defining structure 300 are removed, and the corresponding reflective electrode 2000a and the transparent electrode 2000b are formed. For reference Figure 7 As shown in step g, the transparent electrode 2000b and the pixel defining structure 300 are prepared with the light emitting layer 2100 and the cathode layer 2200 away from the substrate 100 side, wherein the light emitting layer 2100 and the cathode layer 2200 can be prepared as a whole, and the light emitting layer 2100 includes the first light emitting layer in the first light emitting element and the second light emitting layer in the second light emitting element, and the cathode layer 2200 includes the first cathode layer in the first light emitting element and the second cathode layer in the second light emitting element. It should be noted that the positions of the first light emitting element and the second light emitting element are not specifically shown in the figure in order to reflect the process.

[0096] In summary, the embodiment of the present application provides a preparation method of a display panel. In order to ensure the light emitting efficiency of different light emitting elements, the thicknesses of the first anode layer and the second anode layer are adjusted, and the distances from the surfaces of the first anode layer and the second anode layer away from the substrate to the substrate are adjusted. Specifically, along the thickness direction of the display panel, the thickness of the first anode layer is adjusted to h1, the distance from the surface of the first anode layer away from the substrate to the substrate is adjusted to S1, the thickness of the second anode layer is adjusted to h2, and the distance from the surface of the second anode layer away from the substrate to the substrate is adjusted to S2, which satisfies h1

[0097] Based on the same inventive concept, the embodiment of the present application also provides a display device, Figure 8 FIG. 1 is a structural schematic diagram of a display device provided by an embodiment of the present application, which includes any one of the display panels provided by the above embodiments. For example, referring to Figure 8The display device 1 comprises the display panel 10. Therefore, the display device also has the beneficial effects of the display panel in the above embodiments, and the same can be understood with reference to the above explanation of the display panel, which will not be repeated hereinafter.

[0098] The display device 1 provided by the embodiments of the present application can be any electronic product with display function, including but not limited to the following categories: television, notebook computer, desktop display, tablet computer, digital camera, smart bracelet, smart glasses, vehicle-mounted display, industrial control equipment, medical display screen, touch interactive terminal, etc., and the embodiments of the present application do not make special limitations thereon.

[0099] Obviously, the above embodiments of the present application are only examples for clear illustration of the present application, and are not limitations on the embodiments of the present application. For ordinary skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. Here, it is unnecessary and impossible to exhaust all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A display panel, characterized by, The display panel comprises a substrate and a light-emitting element located on one side of the substrate; The light-emitting element comprises first and second light-emitting elements with different light-emitting colors; The first light-emitting element comprises a first anode layer, a first light-emitting layer and a first cathode layer, the first anode layer is located on one side of the substrate, the first light-emitting layer is located on the side of the first anode layer away from the substrate, and the first cathode layer is located on the side of the first light-emitting layer away from the first anode layer; the second light-emitting element comprises a second anode layer, a second light-emitting layer and a second cathode layer, the second anode layer is located on one side of the substrate, the second light-emitting layer is located on the side of the second anode layer away from the substrate, and the second cathode layer is located on the side of the second light-emitting layer away from the second anode layer; Wherein, along the thickness direction of the display panel, the thickness of the first anode layer is h1, the distance from the surface of the first anode layer away from the substrate to the substrate is S1, the thickness of the second anode layer is h2, and the distance from the surface of the second anode layer away from the substrate to the substrate is S2, satisfying h1 < h2 and |S1-S2| / S2 ≤ 0.

2.

2. The display panel of claim 1, wherein, The substrate comprises a pixel circuit, and the pixel circuit comprises a first pixel circuit; The display panel further comprises a pixel defining layer, and the pixel defining layer comprises a first pixel defining part, the first pixel defining part is located on the side of the first anode layer close to the substrate, and the first pixel defining part comprises a first via, the first anode layer is electrically connected to the first pixel circuit through the first via; Wherein, along the thickness direction of the display panel, the thickness of the first pixel defining part is h3, and h3 + h1 = S1 is satisfied.

3. The display panel of claim 2, wherein, The pixel circuit further comprises a second pixel circuit; The second anode layer is arranged in close contact with the substrate, and h2 = S2 is satisfied.

4. The display panel of claim 2, wherein, The pixel circuit further comprises a second pixel circuit; The pixel defining structure comprises a second pixel defining part, the second pixel defining part is located on the side of the second anode layer close to the substrate, the second pixel defining part comprises a second via, and the second anode layer is electrically connected to the second pixel circuit through the second via; Wherein, along the thickness direction of the display panel, the thickness of the second pixel defining part is h4, and h4 + h2 = S2 is satisfied.

5. The display panel of claim 1, wherein, The first anode layer comprises a first reflective electrode and a first transparent electrode, and the first reflective electrode is located on the side of the first transparent electrode close to the substrate; the second anode layer comprises a second reflective electrode and a second transparent electrode, and the second reflective electrode is located on the side of the second transparent electrode close to the substrate; Wherein, along the thickness direction of the display panel, the thickness of the first reflective electrode is h11, the thickness of the first transparent electrode is h12, the thickness of the second reflective electrode is h21, and the thickness of the second transparent electrode is h22; h11 = h21 and h12 < h22 are satisfied.

6. The display panel of claim 1, wherein The pixel defining structure comprises a third pixel defining part, a projection of the third pixel defining part on the substrate is located between a projection of the first anode layer on the substrate and a projection of the second anode layer on the substrate. The distance from a surface of the third pixel defining part away from a side of the substrate to the substrate is S3, and |S1-S3| / S3≤0.2 and |S2-S3| / S3≤0.2 are satisfied.

7. The display panel of claim 1, wherein, The pixel defining structure comprises a fourth pixel defining part, a projection of the fourth pixel defining part on the substrate is located between a projection of the first anode layer on the substrate and a projection of the second anode layer on the substrate. The distance from a surface of the fourth pixel defining part away from a side of the substrate to the substrate is S4, and S1 8. The display panel of claim 1, wherein, The light-emitting wavelength of the first light-emitting element is less than the light-emitting wavelength of the second light-emitting element.

9. A method for manufacturing a display panel according to any one of claims 1 to 8, characterized in that The preparation method comprises: providing a substrate; preparing a first light-emitting element and a second light-emitting element on a side of the substrate; the first light-emitting element comprises a first anode layer, a first light-emitting layer and a first cathode layer, the first anode layer is located on a side of the substrate, the first light-emitting layer is located on a side of the first anode layer away from the substrate, and the first cathode layer is located on a side of the first light-emitting layer away from the first anode layer; the second light-emitting element comprises a second anode layer, a second light-emitting layer and a second cathode layer, the second anode layer is located on a side of the substrate, the second light-emitting layer is located on a side of the second anode layer away from the substrate, and the second cathode layer is located on a side of the second light-emitting layer away from the second anode layer; wherein, along a thickness direction of the substrate, a thickness of the first anode layer is h1, a distance from a surface of the first anode layer away from a side of the substrate to the substrate is S1, a thickness of the second anode layer is h2, and a distance from a surface of the second anode layer away from a side of the substrate to the substrate is S2, and h1 10. A display device, characterized by comprising: The display panel of any one of claims 1-8. The display panel of any one of claims 1-8.

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