Display panel and method for manufacturing the same

Abstract

The present disclosure provides a display panel and a method for manufacturing the display panel. The method for manufacturing the display panel may include: forming a first electrode on a driving backplane; forming a first light-emitting layer by inkjet printing on a side of the first electrode away from the driving backplane; vapor-depositing a charge generation layer on a side of the first light-emitting layer away from the driving backplane; vapor-depositing a second light-emitting layer on a side of the charge generation layer away from the driving backplane; and forming a second electrode on a side of the second light-emitting layer away from the driving backplane. The present disclosure can improve the light-emitting brightness and life of the display panel.

Description

Technical Field

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

[0002] With the rapid development of display technology, organic electroluminescent display panels have broad application prospects due to their advantages such as high response, high contrast and flexibility, especially in flexible display, which can better reflect the advantages of organic electroluminescent display panels. At present, in the process of making display panels, a driving backplane is first formed, and then a first electrode, a light-emitting layer and a second electrode are formed on the driving backplane in sequence. However, the luminous brightness and life of the display panel formed are both low, which reduces the use effect of the display panel. Summary of the invention

[0003] The purpose of the present disclosure is to provide a display panel and a method for manufacturing the display panel, which can improve the luminous brightness and life of the display panel.

[0004] According to one aspect of the present disclosure, there is provided a method for preparing a display panel, comprising:

[0005] forming a first electrode on a driving backplane;

[0006] Forming a first light-emitting layer on a side of the first electrode away from the driving backplane by inkjet printing;

[0007] Depositing a charge generation layer on a side of the first light-emitting layer away from the driving backplane;

[0008] Vapor depositing a second light-emitting layer on a side of the charge generation layer away from the driving backplane;

[0009] A second electrode is formed on a side of the second light emitting layer away from the driving backplane.

[0010] Furthermore, the second light-emitting layer is a monochromatic light-emitting layer.

[0011] Furthermore, the first light-emitting layer includes a plurality of light-emitting areas, and two of the plurality of light-emitting areas have different light-emitting colors.

[0012] Furthermore, the light emitting color of the second light emitting layer is the same as the light emitting color of one of the plurality of light emitting regions.

[0013] Furthermore, the multiple light-emitting areas include a first light-emitting area, the light-emitting color of the first light-emitting area is the same as the light-emitting color of the second light-emitting layer, and light having the light-emitting color of the first light-emitting area forms a standing wave between the first electrode and the second electrode, and taking the surface of the first electrode facing the second electrode as a reference plane, the first light-emitting area is located on a first anti-node of the standing wave, and the second light-emitting layer is located on a second anti-node of the standing wave.

[0014] Furthermore, the plurality of light-emitting areas include a blue light-emitting area, a red light-emitting area and a green light-emitting area, and the second light-emitting layer is a blue light-emitting layer.

[0015] Furthermore, one of the first electrode and the second electrode is a reflective electrode, and the other is a semi-transmissive and semi-reflective electrode.

[0016] Furthermore, before evaporating the charge generation layer on the side of the first light-emitting layer away from the driving backplane, the preparation method further comprises:

[0017] A first electron injection layer is formed on a side of the first light-emitting layer away from the driving backplane, and the charge generation layer is located on a side of the first electron injection layer away from the driving backplane;

[0018] Before evaporating the second light-emitting layer on the side of the charge generation layer away from the driving backplane, the preparation method further comprises:

[0019] A first hole transport layer is evaporated on a side of the charge generation layer away from the driving backplane, and the second light emitting layer is located on a side of the first hole transport layer away from the driving backplane.

[0020] According to one aspect of the present disclosure, a display panel is provided. The display panel is manufactured by the above-mentioned method for manufacturing a display panel.

[0021] According to one aspect of the present disclosure, there is provided a display panel, comprising:

[0022] Driver backplane;

[0023] A first electrode, disposed on the driving backplane;

[0024] A first light-emitting layer, disposed on a side of the first electrode away from the driving backplane, the first light-emitting layer comprising a first light-emitting area;

[0025] A charge generation layer, disposed on a side of the first light-emitting layer away from the driving backplane;

[0026] A second light-emitting layer is provided on a side of the charge generation layer away from the driving backplane, the second light-emitting layer is a monochromatic light-emitting layer, and the light-emitting color of the second light-emitting layer is the same as the light-emitting color of the first light-emitting area;

[0027] A second electrode is provided on a side of the second light-emitting layer away from the driving backplane;

[0028] Light having the luminous color of the first luminous area forms a standing wave between the first electrode and the second electrode. Taking the surface of the first electrode facing the second electrode as a reference plane, the first luminous area is located on the first anti-node of the standing wave, and the second luminous layer is located on the second anti-node of the standing wave.

[0029] The display panel and preparation method thereof disclosed in the present invention form a first light-emitting layer by inkjet printing and form a second light-emitting layer by evaporation. Both the first light-emitting layer and the second light-emitting layer are light-emitting film layers, thereby increasing the total thickness of the light-emitting film layers between the first electrode and the second electrode, solving the problem that the inkjet printing method cannot form a thicker light-emitting film layer, making it difficult for the first electrode and the second electrode to short-circuit, and reducing dark spots on the display panel; at the same time, the first light-emitting layer and the second light-emitting layer connected by the charge generation layer are equivalent to two light-emitting units, thereby improving the light-emitting brightness and life of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a flow chart of a method for preparing a display panel according to an embodiment of the present disclosure.

[0031] Figure 2 It is a schematic diagram after step 110 is completed in the method for preparing a display panel according to an embodiment of the present disclosure.

[0032] Figure 3 is a schematic diagram of a display panel according to an embodiment of the present disclosure.

[0033] Explanation of the figure markings: 1. driving backplane; 2. first electrode; 3. second hole injection layer; 4. second hole transport layer; 5. first light-emitting layer; 501. first light-emitting area; 502. second light-emitting area; 503. third light-emitting area; 6. first electron injection layer; 7. charge generation layer; 8. first hole transport layer; 9. second light-emitting layer; 10. second electron transport layer; 11. second electron injection layer; 12. second electrode; 13. pixel definition layer. DETAILED DESCRIPTION

[0034] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0035] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. "Multiple" or "several" means two and more than two. Unless otherwise specified, words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. As used in this disclosure and the appended claims, the singular forms "a", "an", "said", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

[0036] The present disclosure provides a method for manufacturing a display panel. Figure 1 As shown, the method for preparing the display panel may include steps S100 to S140, wherein:

[0037] Step S100: forming a first electrode on a driving backplane.

[0038] Step S110: forming a first light-emitting layer on a side of the first electrode away from the driving backplane by inkjet printing.

[0039] Step S120, evaporating a charge generation layer on a side of the first light-emitting layer away from the driving backplane.

[0040] Step S130, evaporating a second light-emitting layer on a side of the charge generation layer away from the driving backplane.

[0041] Step S140: forming a second electrode on a side of the second light-emitting layer away from the driving backplane.

[0042] like Figure 3 As shown, the preparation method of the display panel of the embodiment of the present disclosure forms the first light-emitting layer 5 by inkjet printing, and forms the second light-emitting layer 9 by evaporation. The first light-emitting layer 5 and the second light-emitting layer 9 are both light-emitting film layers, thereby increasing the total thickness of the light-emitting film layer between the first electrode 2 and the second electrode 12, solving the problem that the inkjet printing method cannot form a thicker light-emitting film layer, making it difficult for the first electrode 2 and the second electrode 12 to short-circuit, thereby reducing dark spots on the display panel; at the same time, the first light-emitting layer 5 and the second light-emitting layer 9 connected by the charge generation layer 7 are equivalent to two light-emitting units, thereby improving the luminance and life of the display panel.

[0043] The steps of the method for preparing a display panel according to the embodiment of the present disclosure are described in detail below:

[0044] In step S100 , a first electrode is formed on a driving backplane.

[0045] like Figure 2As shown, the driving backplane 1 may include a substrate and a driving circuit layer. The substrate may be a flexible substrate, such as a polyimide substrate, etc., but the embodiments of the present disclosure are not limited thereto, and the substrate may also be a hard substrate, such as a glass substrate, etc. The driving circuit layer may be disposed on the substrate. The driving circuit layer may include a thin film transistor. The thin film transistor may be a top-gate thin film transistor, and of course, the thin film transistor may also be a bottom-gate thin film transistor. Taking the thin film transistor as a top-gate thin film transistor as an example, the thin film transistor may include an active layer, a gate insulating layer, a gate electrode, an interlayer insulating layer, a source electrode, and a drain electrode. The active layer may be disposed on the substrate. The active layer may include an undoped channel region, a source region, and a drain region. The gate insulating layer may be disposed on the substrate and cover the active layer. The gate electrode may be disposed on a side of the gate insulating layer away from the substrate. The interlayer insulating layer may be disposed on the gate insulating layer and cover the gate electrode. The source and drain electrodes may be disposed on the interlayer insulating layer and coupled to the source region and drain region of the active layer via vias passing through the interlayer insulating layer and the gate insulating layer. The driving backplane 1 may further include a planarization layer and a pixel definition layer 13. The planarization layer may be provided on the above-mentioned interlayer insulating layer and cover the source and drain of the thin film transistor. The pixel definition layer 13 may be formed on the planarization layer. The pixel definition layer 13 may be provided with a plurality of openings exposing the planarization layer. The number of the first electrodes 2 may be multiple, and the plurality of first electrodes 2 may be provided in the plurality of openings of the pixel definition layer 13 in a one-to-one correspondence, and each first electrode 2 may be provided in an area of ​​the planarization layer exposed to the opening of the pixel definition layer 13, and may be electrically connected to the source or drain of the thin film transistor via a via through the planarization layer. Among them, the first electrode 2 may be prepared by evaporation, but the embodiments of the present disclosure are not limited thereto. The first electrode 2 may be a reflective electrode, and of course, the first electrode 2 may also be a semi-transparent and semi-reflective electrode. The reflective electrode may include a first ITO layer, a reflective metal layer, and a second ITO layer stacked. The material of the reflective metal layer may be Al, and of course, may also be a metal material with a high reflectivity such as Ag. The semi-transmissive and semi-reflective electrode may be a MgAg electrode, the thickness of which may be 10nm-15nm, and may form a strong microcavity structure with the reflective electrode. The semi-transmissive and semi-reflective electrode may be an IZO electrode, the thickness of which may be 50nm-200nm, and may form a weak microcavity structure with the reflective electrode. In addition, the first electrode 2 may be an anode.

[0046] In step S110, a first light-emitting layer is formed on a side of the first electrode away from the driving backplane by inkjet printing.

[0047] like Figure 2As shown, taking the first electrode 2 as an anode as an example, before forming the first light-emitting layer 5, the method for preparing a display panel of the embodiment of the present disclosure may also include: forming a second hole injection layer 3 and a second hole transport layer 4 in sequence on the side of the first electrode 2 away from the driving backplane 1. Wherein, the second hole injection layer 3 and the second hole transport layer 4 can be formed by inkjet printing. The first light-emitting layer 5 can be formed on the side of the second hole transport layer 4 away from the first electrode 2. The first light-emitting layer 5 can emit light of a single color, that is, the first light-emitting layer 5 is a monochrome light-emitting layer. Of course, the first light-emitting layer 5 can emit light of multiple colors, that is, the first light-emitting layer 5 can include multiple light-emitting areas, and there are two light-emitting areas in the multiple light-emitting areas with different light-emitting colors. Specifically, the first light-emitting layer 5 may include a first light-emitting area 501, a second light-emitting area 502, and a third light-emitting area 503. There are two light-emitting areas in the first light-emitting area 501, the second light-emitting area 502, and the third light-emitting area 503 with different light-emitting colors. Further, the luminous colors of any two luminous areas among the first luminous area 501, the second luminous area 502 and the third luminous area 503 are different. Among them, the first luminous area 501 can be a blue light luminous area, but the embodiments of the present disclosure are not limited thereto, and the first luminous area 501 can also be a red light luminous area or a green light luminous area. Taking the first luminous area 501 as a blue light luminous area as an example, the second luminous area 502 can be a red light luminous area, and the third luminous area 503 can be a green light luminous area.

[0048] In step S120, a charge generation layer is evaporated on a side of the first light emitting layer away from the driving backplane.

[0049] like Figure 2 and Figure 3 As shown, the embodiment of the present disclosure can adopt an open mask to evaporate the charge generation layer 7 (CGL). The material of the charge generation layer 7 can be 4,7-diphenyl-1,10-phenanthroline (Bphen:Li) and the like. Before evaporating the charge generation layer 7 on the side of the first light-emitting layer 5 away from the driving backplane 1, the preparation method of the present disclosure can also include: forming a first electron injection layer 6 on the side of the first light-emitting layer 5 away from the driving backplane 1. The first electron injection layer 6 can be formed by evaporation. The charge generation layer 7 can be located on the side of the first electron injection layer 6 away from the driving backplane 1.

[0050] In step S130, a second light emitting layer is evaporated on a side of the charge generation layer away from the driving backplane.

[0051] like Figure 2 and Figure 3As shown, before the second light-emitting layer 9 is evaporated on the side of the charge generation layer 7 away from the driving backplane 1, the preparation method disclosed in the present invention may also include: evaporating the first hole transport layer 8 on the side of the charge generation layer 7 away from the driving backplane 1. The second light-emitting layer 9 may be located on the side of the first hole transport layer 8 away from the driving backplane 1. The second light-emitting layer 9 may be a monochromatic light-emitting layer. Taking the first light-emitting layer 5 as an example including multiple light-emitting areas, the light-emitting color of the second light-emitting layer 9 is the same as the light-emitting color of one of the multiple light-emitting areas. For example, the second light-emitting layer 9 is the same as the light-emitting color of the first light-emitting area 501. Based on this, the light with the light-emitting color of the first light-emitting area 501 forms a standing wave between the first electrode 2 and the second electrode 12. With the surface of the first electrode 2 facing the second electrode 12 as the reference surface, the first light-emitting area 501 is located on the first anti-node of the standing wave, and the second light-emitting layer 9 is located on the second anti-node of the standing wave. At this time, the light with the light-emitting color of the first light-emitting area 501 produces constructive interference to enhance its light output intensity. Further, taking the first light-emitting area 501 as a blue light-emitting area as an example, the second light-emitting layer 9 is a blue light-emitting layer, and the blue light forms a standing wave between the first electrode 2 and the second electrode 12. The surface of the first electrode 2 facing the second electrode 12 is used as a reference surface. The first light-emitting area 501 is located at the first anti-node of the standing wave, and the second light-emitting layer 9 is located at the second anti-node of the standing wave. The blue light generates constructive interference to enhance its light output intensity. In addition, since the second light-emitting layer 9 is a monochromatic light-emitting layer, the second light-emitting layer 9 is a whole layer, and it can be made using an open mask without the need for a fine metal mask (FMM), which can simplify the manufacturing process and reduce the manufacturing cost.

[0052] In step S140, a second electrode is formed on a side of the second light emitting layer away from the driving backplane.

[0053] like Figure 2 and Figure 3 As shown, the second electrode 12 can be prepared by evaporation. Taking the first electrode 2 as an anode as an example, the second electrode 12 can be a cathode. The second electrode 12 can be a reflective electrode. Of course, the second electrode 12 can also be a semi-transparent and semi-reflective electrode. For example, the first electrode 2 is a reflective electrode, and the second electrode 12 is a semi-transparent and semi-reflective electrode. In addition, before forming the second electrode 12, the method for preparing the display panel of the embodiment of the present disclosure may also include: forming a second electron transport layer 10 and a second electron injection layer 11 in sequence on the side of the second light-emitting layer 9 away from the driving backplane 1. Among them, the second electron transport layer 10 and the second electron injection layer 11 can both be formed by evaporation. The second electrode 12 can be formed on the side of the second electron injection layer 11 away from the second light-emitting layer 9.

[0054] The embodiment of the present disclosure also provides a display panel. The display panel can be prepared by the method for preparing a display panel described in any of the above embodiments. The display panel and the method for preparing a display panel provided in the embodiment of the present disclosure belong to the same inventive concept, and the description of the relevant details and beneficial effects can be referred to each other, and will not be repeated here.

[0055] The present disclosure also provides a display panel. Figure 2 and Figure 3 As shown, the display panel may include a driving backplane 1, a first electrode 2, a first light-emitting layer 5, a charge generation layer 7, a second light-emitting layer 9 and a second electrode 12, wherein:

[0056] The first electrode 2 is disposed on the driving backplane 1. The first light-emitting layer 5 is disposed on a side of the first electrode 2 away from the driving backplane 1. The first light-emitting layer 5 includes a first light-emitting area 501. The charge generation layer 7 is disposed on a side of the first light-emitting layer 5 away from the driving backplane 1. The second light-emitting layer 9 is disposed on a side of the charge generation layer 7 away from the driving backplane 1. The second light-emitting layer 9 is a monochromatic light-emitting layer. The light color of the second light-emitting layer 9 is the same as the light color of the first light-emitting area 501. The second electrode 12 is disposed on a side of the second light-emitting layer 9 away from the driving backplane 1. Light having the light color of the first light-emitting area 501 forms a standing wave between the first electrode 2 and the second electrode 12. With the surface of the first electrode 2 facing the second electrode 12 as a reference surface, the first light-emitting area 501 is located on the first anti-node of the standing wave, and the second light-emitting layer 9 is located on the second anti-node of the standing wave. The display panel and the method for preparing the display panel provided in the embodiment of the present disclosure belong to the same inventive concept, and the description of the relevant details and beneficial effects can be referred to each other, and will not be repeated.

[0057] Performance Testing

[0058] Comparative Example 1

[0059] The display panel of this comparative example 1 includes a stacked drive backplane, a first electrode, a second hole injection layer, a second hole transport layer, a light-emitting layer, a second electron transport layer, a second electron injection layer and a second electrode. The first electrode is an anode and a reflective electrode. The second electrode is a cathode and a semi-transparent and semi-reflective electrode. The semi-transparent and semi-reflective electrode is a MgAg electrode with a thickness of 15nm. The light-emitting layer includes a blue light-emitting area, a green light-emitting area and a red light-emitting area. The light-emitting layer is formed by inkjet printing.

[0060] Example 1

[0061] The display panel of the present embodiment 1 includes a stacked drive backplane, a first electrode, a second hole injection layer, a second hole transport layer, a first light-emitting layer, a first electron injection layer, a charge generation layer, a first hole transport layer, a second light-emitting layer, a second electron transport layer, a second electron injection layer and a second electrode. The first electrode is an anode and a reflective electrode. The second electrode is a cathode and a semi-transparent and semi-reflective electrode. The semi-transparent and semi-reflective electrode is a MgAg electrode with a thickness of 15nm. The first light-emitting layer includes a blue light-emitting area, a green light-emitting area and a red light-emitting area. The second light-emitting layer is a blue light-emitting layer. The first light-emitting layer is formed by inkjet printing, and the second light-emitting layer is formed by evaporation. The total thickness of the first electron injection layer, the charge generation layer, the first hole transport layer, the second light-emitting layer, the second electron transport layer, the second electron injection layer and the second electrode is 115nm.

[0062] Example 2

[0063] The only difference between Embodiment 2 and Embodiment 1 is that the thickness of the green light emitting area and the red light emitting area in the first light emitting layer is reduced.

[0064] The performances of Comparative Example 1, Example 1 and Example 2 are shown in Table 1.

[0065] Table 1

[0066]

[0067] Comparative Example 2

[0068] The only difference between Comparative Example 2 and Comparative Example 1 is that the semi-transmissive and semi-reflective electrode is an IZO electrode with a thickness of 100 nm.

[0069] Example 3

[0070] The only difference between Example 3 and Example 1 is that the semi-transmissive and semi-reflective electrode is an IZO electrode with a thickness of 100nm, and the total thickness of the first electron injection layer, the charge generation layer, the first hole transport layer, the second light-emitting layer, the second electron transport layer, the second electron injection layer and the second electrode is 135nm.

[0071] Example 4

[0072] The only difference between Embodiment 4 and Embodiment 3 is that the thickness of the green light emitting area and the red light emitting area in the first light emitting layer is reduced.

[0073] The performance of Comparative Example 2, Example 3 and Example 4 are shown in Table 2.

[0074] Table 2

[0075]

[0076] The above is only a preferred embodiment of the present disclosure and does not limit the present disclosure in any form. Although the present disclosure has been disclosed as a preferred embodiment as above, it is not used to limit the present disclosure. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present disclosure. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present disclosure without departing from the content of the technical solution of the present disclosure are still within the scope of the technical solution of the present disclosure.

Claims

1. A method for preparing a display panel, characterized in that: include: forming a first electrode on a driving backplane; A first light-emitting layer is formed on a side of the first electrode away from the driving backplane by inkjet printing, wherein the first light-emitting layer includes a plurality of light-emitting areas, and the plurality of light-emitting areas include a first light-emitting area; Depositing a charge generation layer on a side of the first light-emitting layer away from the driving backplane; Vapor depositing a second light-emitting layer on a side of the charge generation layer away from the driving backplane; forming a second electrode on a side of the second light-emitting layer away from the driving backplane; The luminous color of the first luminous area is the same as the luminous color of the second luminous layer. Light having the luminous color of the first luminous area forms a standing wave between the first electrode and the second electrode. Taking the surface of the first electrode facing the second electrode as a reference plane, the first luminous area is located on a first anti-node of the standing wave, and the second luminous layer is located on a second anti-node of the standing wave.

2. The method for preparing a display panel according to claim 1, characterized in that: The second light-emitting layer is a monochromatic light-emitting layer.

3. The method for preparing a display panel according to claim 2, characterized in that: Among the plurality of light-emitting areas, two of the light-emitting areas emit light of different colors.

4. The method for preparing a display panel according to claim 3, characterized in that: The plurality of light-emitting regions include a blue light-emitting region, a red light-emitting region and a green light-emitting region, and the second light-emitting layer is a blue light-emitting layer.

5. The method for preparing a display panel according to claim 1, characterized in that: One of the first electrode and the second electrode is a reflective electrode, and the other is a semi-transmissive and semi-reflective electrode.

6. The method for preparing a display panel according to claim 1, characterized in that: Before evaporating the charge generation layer on the side of the first light-emitting layer away from the driving backplane, the preparation method further comprises: A first electron injection layer is formed on a side of the first light-emitting layer away from the driving backplane, and the charge generation layer is located on a side of the first electron injection layer away from the driving backplane; Before evaporating the second light-emitting layer on the side of the charge generation layer away from the driving backplane, the preparation method further comprises: A first hole transport layer is evaporated on a side of the charge generation layer away from the driving backplane, and the second light emitting layer is located on a side of the first hole transport layer away from the driving backplane.

7. A display panel, characterized in that: The display panel is prepared by the method for preparing a display panel according to any one of claims 1 to 6.

8. A display panel, characterized in that: include: Driver backplane; A first electrode, disposed on the driving backplane; A first light-emitting layer, disposed on a side of the first electrode away from the driving backplane, the first light-emitting layer comprising a first light-emitting area; A charge generation layer, disposed on a side of the first light-emitting layer away from the driving backplane; A second light-emitting layer is provided on a side of the charge generation layer away from the driving backplane, the second light-emitting layer is a monochromatic light-emitting layer, and the light-emitting color of the second light-emitting layer is the same as the light-emitting color of the first light-emitting area; A second electrode is provided on a side of the second light-emitting layer away from the driving backplane; Light having the luminous color of the first luminous area forms a standing wave between the first electrode and the second electrode. Taking the surface of the first electrode facing the second electrode as a reference plane, the first luminous area is located on the first anti-node of the standing wave, and the second luminous layer is located on the second anti-node of the standing wave.

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