Display panel, display device and preparation method of display panel

Abstract

The invention discloses a display panel, a display device and a preparation method of the display panel. The display panel comprises a substrate, a pixel definition layer, a pixel electrode and a protection layer. The pixel defining part of the pixel defining layer is enclosed to form a pixel opening. The orthographic projection of the protective layer on the substrate is at least partially overlapped with the overlapping area, and the protective layer can cover at least part of the pixel electrode exposed out of the pixel opening, so as to reduce the residue of the pixel defining material on the surface of the part of the pixel electrode exposed out of the pixel opening; in the subsequent process, a relatively strong plasma photoresist removing process is adopted to remove the pixel definition material, and the protection layer covers at least part of the pixel electrode, so that the problem that the pixel electrode is damaged due to the relatively strong plasma photoresist removing process can be improved, and the device performance of the pixel electrode is ensured; in addition, the problems that the surface roughness of the pixel electrode is increased, the reflectivity is reduced and the image quality of the display panel becomes poor due to the fact that the pixel defining material is left on the surface of the pixel electrode can be avoided, and therefore the use performance of the display panel is improved.

Description

Technical Field

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

[0002] Organic Light Emitting Diode (OLED) and flat panel display devices based on technologies such as Light Emitting Diode (LED) have been widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc. due to their advantages such as high image quality, power saving, thin body and wide application range, becoming the mainstream in display devices.

[0003] However, the performance of current OLED display products needs to be improved. Summary of the invention

[0004] The embodiments of the present application provide a display panel, a display device, and a method for manufacturing a display panel, aiming to improve the performance of OLED display products.

[0005] In a first aspect, an embodiment of the present application provides a display panel, comprising: a substrate; a pixel definition layer located on the substrate, the pixel definition layer comprising a pixel defining portion and a pixel opening enclosed by the pixel defining portion; a pixel electrode located between the substrate and the pixel definition layer, an orthographic projection of the pixel electrode on the substrate and an orthographic projection of the pixel opening on the substrate having an overlapping area; a protective layer, at least a portion of the protective layer being located between the pixel electrode and the pixel defining portion; and / or at least a portion of the protective layer being located on a side of the pixel electrode away from the substrate, the orthographic projection of the protective layer on the substrate at least partially overlapping with the overlapping area.

[0006] According to an implementation of the first aspect of the present application, an orthographic projection of the pixel opening on the substrate is located within an orthographic projection of the protective layer on the substrate.

[0007] According to any of the aforementioned embodiments of the first aspect of the present application, the orthographic projection area of ​​the pixel opening on the substrate is less than or equal to the orthographic projection area of ​​the protective layer on the substrate.

[0008] According to any of the aforementioned embodiments of the first aspect of the present application, the orthographic projection of the pixel electrode on the substrate is located within the orthographic projection of the protective layer on the substrate.

[0009] According to any of the aforementioned embodiments of the first aspect of the present application, the orthographic projection area of ​​the pixel electrode on the substrate is less than or equal to the orthographic projection area of ​​the protective layer on the substrate.

[0010] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the protective layer is greater than or equal to 2 nm and less than or equal to 5 nm.

[0011] According to any of the aforementioned embodiments of the first aspect of the present application, the protective layer includes a first auxiliary light-emitting functional layer.

[0012] According to any of the aforementioned embodiments of the first aspect of the present application, the first auxiliary light-emitting functional layer includes one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer.

[0013] According to any of the aforementioned embodiments of the first aspect of the present application, the protective layer is continuously disposed at the pixel opening.

[0014] According to any of the aforementioned embodiments of the first aspect of the present application, the protective layer includes a plurality of protective portions arranged at intervals, and the protective portions at least partially overlap with the overlapping area in the orthographic projection of the substrate.

[0015] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the protective layer includes insulating material.

[0016] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the protective layer includes an inorganic material.

[0017] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the protective layer includes silicon dioxide or silicon oxide.

[0018] According to any of the aforementioned embodiments of the first aspect of the present application, a hollow portion is opened on the protective layer, and the orthographic projection of the hollow portion on the substrate at least partially overlaps with the orthographic projection of the pixel opening on the substrate.

[0019] According to any of the aforementioned embodiments of the first aspect of the present application, the orthographic projection of the hollow portion on the substrate is located within the orthographic projection of the pixel opening on the substrate.

[0020] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the pixel defining portion includes a black opaque material.

[0021] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel further includes: a light-emitting layer, at least a portion of which is located at the pixel opening.

[0022] According to any of the aforementioned implementations of the first aspect of the present application, the display panel further includes: a second auxiliary light-emitting functional layer, located on a side of the light-emitting layer away from the substrate.

[0023] According to any of the aforementioned embodiments of the first aspect of the present application, the second auxiliary light-emitting functional layer includes one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer; the second auxiliary light-emitting functional layer covers the pixel opening and the side of the pixel defining portion away from the substrate.

[0024] According to any of the aforementioned embodiments of the first aspect of the present application, the second auxiliary light-emitting functional layer includes one or more of a hole blocking layer, an electron transport layer and an electron injection layer; the protective layer includes one or more of a hole injection layer, a hole transport layer and an electron blocking layer; or, the second auxiliary light-emitting functional layer includes one or more of a hole injection layer, a hole transport layer and an electron blocking layer; the protective layer includes one or more of a hole blocking layer, an electron transport layer and an electron injection layer.

[0025] According to any of the aforementioned embodiments of the first aspect of the present application, the second auxiliary light-emitting function layer is continuously disposed in the gaps between the plurality of pixel openings.

[0026] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel also includes: a third auxiliary light-emitting functional layer, located between the light-emitting layer and the protective layer; the third auxiliary light-emitting functional layer covers the pixel opening and the side of the pixel defining portion away from the substrate.

[0027] According to any of the aforementioned embodiments of the first aspect of the present application, the second auxiliary light-emitting functional layer includes one or more of a hole blocking layer, an electron transport layer and an electron injection layer; the third auxiliary light-emitting functional layer includes one or more of a hole injection layer, a hole transport layer and an electron blocking layer; or, the second auxiliary light-emitting functional layer includes one or more of a hole injection layer, a hole transport layer and an electron blocking layer; the third auxiliary light-emitting functional layer includes one or more of a hole blocking layer, an electron transport layer and an electron injection layer.

[0028] According to any of the aforementioned embodiments of the first aspect of the present application, the third auxiliary light-emitting function layer is continuously disposed in the gaps between the plurality of pixel openings.

[0029] According to any of the aforementioned embodiments of the first aspect of the present application, the third auxiliary light-emitting functional layer includes one or more of a hole transport layer and an electron blocking layer, and the protective layer includes one or more of a hole injection layer and a hole transport layer; or, the third auxiliary light-emitting functional layer includes one or more of a hole blocking layer and an electron transport layer, and the protective layer includes one or more of an electron transport layer and an electron injection layer.

[0030] According to any of the aforementioned implementations of the first aspect of the present application, the display panel further includes: a first electrode layer, located on a side of the light-emitting layer facing away from the substrate.

[0031] According to any of the aforementioned implementations of the first aspect of the present application, the display panel further includes: an encapsulation layer located on a side of the first electrode layer facing away from the substrate.

[0032] According to any of the aforementioned embodiments of the first aspect of the present application, the encapsulation layer includes: a first encapsulation layer, located on a side of the first electrode layer facing away from the substrate.

[0033] According to any of the aforementioned implementations of the first aspect of the present application, the encapsulation layer further includes: a second encapsulation layer, located on a side of the first encapsulation layer facing away from the substrate.

[0034] According to any of the aforementioned implementations of the first aspect of the present application, the encapsulation layer further includes: a third encapsulation layer, located on a side of the second encapsulation layer facing away from the substrate.

[0035] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the first encapsulation layer includes an inorganic material.

[0036] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the second encapsulation layer includes an organic material.

[0037] According to any of the aforementioned embodiments of the first aspect of the present application, the material of the third encapsulation layer includes an inorganic material.

[0038] According to any of the aforementioned implementations of the first aspect of the present application, the display panel further includes: a touch layer located on a side of the encapsulation layer facing away from the substrate.

[0039] According to any of the aforementioned embodiments of the first aspect of the present application, the touch layer includes a first conductive layer and a second conductive layer, and the second conductive layer is located on a side of the first conductive layer facing away from the substrate.

[0040] According to any of the aforementioned embodiments of the first aspect of the present application, one of the first conductive layer and the second conductive layer includes a touch electrode, the other of the first conductive layer and the second conductive layer includes a connecting portion, and some of the touch electrodes are electrically connected to the connecting portion.

[0041] According to any of the aforementioned implementations of the first aspect of the present application, the orthographic projection of the touch electrode on the substrate is located within the orthographic projection of the pixel defining portion on the substrate.

[0042] According to any of the aforementioned embodiments of the first aspect of the present application, the orthographic projection of the connecting portion on the substrate is located within the orthographic projection of the pixel defining portion on the substrate.

[0043] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel further includes: a filter layer located on the side of the encapsulation layer facing away from the substrate, the filter layer includes filter parts, a black matrix is ​​arranged between adjacent filter parts, and the black matrix is ​​located between the filter parts.

[0044] According to any of the aforementioned implementations of the first aspect of the present application, the filter layer is located on a side of the touch layer facing away from the substrate.

[0045] An embodiment of a second aspect of the present application provides a display device, which includes a display panel according to any of the above embodiments.

[0046] An embodiment of a third aspect of the present application provides a method for preparing a display panel, the method comprising:

[0047] preparing a pixel electrode on a substrate;

[0048] Preparing a protective layer on a side of the pixel electrode facing away from the substrate;

[0049] A pixel definition layer is prepared, the pixel definition layer includes a pixel definition portion and a pixel opening enclosed by the pixel definition portion, and an orthographic projection of the pixel electrode on the substrate and an orthographic projection of the pixel opening on the substrate have an overlapping area.

[0050] According to an implementation of the third aspect of the present application, before preparing the pixel definition layer, in the step of preparing a protective layer on a side of the pixel electrode facing away from the substrate, the method further includes:

[0051] An insulating material layer is prepared on a side of the pixel electrode facing away from the substrate; the insulating material layer overlaps at least part of the overlapped area with the orthographic projection of the substrate;

[0052] After forming the pixel opening, the method further includes:

[0053] The insulating material layer is patterned to obtain a protective layer having a hollow portion, wherein an orthographic projection of the hollow portion on the substrate at least partially overlaps an orthographic projection of the pixel opening on the substrate.

[0054] Alternatively, in the step of preparing a protective layer on the side of the pixel electrode facing away from the substrate, the method further comprises:

[0055] An auxiliary light-emitting material layer is prepared on the side of the pixel electrode facing away from the substrate, and the auxiliary light-emitting material layer is patterned to form a protective layer.

[0056] According to any of the aforementioned embodiments of the third aspect of the present application, the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the protective layer on the substrate.

[0057] According to any of the aforementioned embodiments of the third aspect of the present application, the material of the protective layer includes one or more of hole injection materials, hole transport materials, electron blocking materials, hole blocking materials, electron transport materials and electron injection materials.

[0058] According to any of the aforementioned embodiments of the third aspect of the present application, the material of the pixel defining portion includes black opaque material.

[0059] According to any of the aforementioned embodiments of the third aspect of the present application, after the step of preparing a pixel definition layer on a side of the protective layer facing away from the substrate, the method further comprises:

[0060] The light-emitting layer and the second auxiliary light-emitting functional layer are prepared in sequence.

[0061] According to the display panel of the embodiment of the present application, the display panel includes a substrate, a pixel electrode, a pixel definition layer and a protective layer. The pixel electrode serves as a light-emitting electrode of a light-emitting unit to control the light emission of the light-emitting unit. The pixel definition portion of the pixel definition layer encloses a pixel opening to set the light-emitting unit and realize the normal light emission of the light-emitting unit. And the pixel definition portion defines the setting area of ​​each light-emitting unit to reduce the cross-color badness between each light-emitting unit. The protective layer can cover at least part of the pixel electrode. In order to reduce the residue of the pixel definition material on the surface of the part of the pixel electrode exposed by the pixel opening, the pixel definition material is subsequently removed by a strong plasma degumming process. The protective layer covers at least part of the pixel electrode, which can improve the problem of damage to the pixel electrode caused by the strong plasma degumming process, ensure the device performance of the pixel electrode, and also avoid the problem that the pixel definition material remains on the surface of the pixel electrode, resulting in an increase in the surface roughness of the pixel electrode, a decrease in reflectivity, and a deterioration in the image quality of the display panel, thereby improving the performance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features and the accompanying drawings are not drawn to scale.

[0063] Figure 1 is a partial cross-sectional view of a display panel provided in an embodiment of the present application;

[0064] Figure 2 is a partial cross-sectional view of a display panel in another embodiment;

[0065] Figure 3 is a partial cross-sectional view of a display panel in yet another embodiment;

[0066] Figure 4 is a partial cross-sectional view of a display panel in yet another embodiment;

[0067] Figure 5 is a partial cross-sectional view of a display panel in yet another embodiment;

[0068] Figure 6 is a partial cross-sectional view of a display panel in yet another embodiment;

[0069] Figure 7 is a partial cross-sectional view of a display panel in yet another embodiment;

[0070] Figure 8 is a partial cross-sectional view of a display panel in yet another embodiment;

[0071] Fig. 9 is a partial cross-sectional view of a display panel in yet another embodiment;

[0072] Fig.10 It is a schematic flow chart of a method for preparing a display panel provided in an embodiment of the present application.

[0073] Description of reference numerals:

[0074] 10. Display panel;

[0075] 100. Substrate;

[0076] 200, pixel electrode;

[0077] 300, light-emitting layer; 310, second auxiliary light-emitting functional layer; 320, third auxiliary light-emitting functional layer;

[0078] 400, a first encapsulation layer; 410, a second encapsulation layer; 420, a third encapsulation layer;

[0079] 500, a first electrode layer;

[0080] 600, pixel definition layer; 610, pixel definition portion; 620, pixel opening; 630, via hole;

[0081] 700, protective layer; 701, first auxiliary light-emitting functional layer; 710, hollow portion;

[0082] 800, touch layer; 811, connection part; 821, touch electrode; 820, second conductive layer; 810, first conductive layer;

[0083] 900, filter layer; 910, filter unit; 920, black matrix. DETAILED DESCRIPTION

[0084] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0085] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0086] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0087] The embodiments of the present application provide a display panel, a display device, and a method for manufacturing a display panel. The embodiments of the display panel, the display device, and the method for manufacturing a display panel are described below in conjunction with the accompanying drawings.

[0088] An embodiment of the present application provides a display panel, which may be an organic light emitting diode (OLED) display panel.

[0089] See also Figure 1 , Figure 1 It is a partial cross-sectional view of a display panel provided in an embodiment of the present application.

[0090] like Figure 1 As shown, a first aspect of the present application provides a display panel 10 , which includes a substrate 100 , a pixel electrode 200 , a pixel definition layer 600 and a protective layer 700 .

[0091] The pixel definition layer 600 is located on the substrate 100, and the pixel definition layer 600 includes a pixel definition portion 610 and a pixel opening 620 enclosed by the pixel definition portion 610; the pixel electrode 200 is located between the substrate 100 and the pixel definition layer 600, and the orthographic projection of the pixel electrode 200 on the substrate 100 and the orthographic projection of the pixel opening 620 on the substrate 100 have an overlapping area; at least a portion of the protective layer 700 is located between the pixel electrode 200 and the pixel definition layer 600. At least a portion of the protective layer 700 is located between the pixel electrode 200 and the pixel definition portion 610.

[0092] And / or, at least a portion of the protective layer 700 is located on a side of the pixel electrode 200 away from the substrate 100 , and an orthographic projection of the protective layer 700 on the substrate 100 at least partially overlaps with the overlapping region.

[0093] According to the display panel 10 of the embodiment of the present application, the display panel 10 includes a substrate 100, a pixel electrode 200, a pixel definition layer 600 and a protective layer 700. The pixel electrode 200 serves as a light-emitting electrode of the light-emitting layer 300 to control the light emission of the light-emitting layer 300. The pixel definition portion 610 of the pixel definition layer 600 encloses a pixel opening 620 to set the light-emitting layer 300 and realize normal light emission of the light-emitting layer 300. In addition, the pixel definition portion 610 defines the setting area of ​​each light-emitting layer 300 to reduce the cross-color defect between each light-emitting layer 300. The protective layer 700 can cover at least a portion of the pixel electrode 200. In order to reduce the residue of pixel definition material on the surface of the portion of the pixel electrode 200 exposed by the pixel opening 620, a stronger plasma stripping process is subsequently used to remove the pixel definition material. The protective layer 700 covers at least a portion of the pixel electrode 200, which can improve the problem of damage to the pixel electrode 200 caused by the strong plasma stripping process, ensure the device performance of the pixel electrode 200, and avoid the problem that the pixel definition material remains on the surface of the pixel electrode 200, resulting in an increase in the surface roughness of the pixel electrode 200, a decrease in reflectivity, and a deterioration in the image quality of the display panel 10, thereby improving the performance of the display panel 10.

[0094] There are many ways to set the substrate 100. For example, the substrate 100 may include a substrate and an array substrate arranged on the substrate. Alternatively, the substrate 100 is the substrate. Alternatively, the substrate 100 includes a buffer layer and a support plate on a side away from the substrate.

[0095] In some optional embodiments, the orthographic projection of the pixel opening 620 on the substrate 100 is located within the orthographic projection of the protection layer 700 on the substrate 100 .

[0096] In these optional embodiments, the portion of the pixel electrode 200 exposed by the pixel opening 620 can be completely covered by the protective layer 700, and the protective layer 700 can better protect the pixel electrode 200. In order to reduce the residue of pixel definition material on the surface of the portion of the pixel electrode 200 exposed by the pixel opening 620, a stronger plasma stripping process is subsequently used to remove the pixel definition material. The protective layer 700 covers the pixel electrode 200, which can improve the problem of damage to the pixel electrode 200 caused by the strong plasma stripping process, ensure the device performance of the pixel electrode 200, and avoid the problem that the pixel definition material remains on the surface of the pixel electrode 200, resulting in an increase in the surface roughness of the pixel electrode 200, a decrease in reflectivity, and a deterioration in the image quality of the display panel 10, thereby improving the performance of the display panel 10.

[0097] Optionally, the orthographic projection area of ​​the pixel opening 620 on the substrate 100 is less than or equal to the orthographic projection area of ​​the protective layer 700 on the substrate 100, that is, the portion of the pixel electrode 200 exposed by the pixel opening 620 can be completely covered by the protective layer 700, and the protective layer 700 can better protect the pixel electrode 200. In order to reduce the residue of pixel definition material on the surface of the portion of the pixel electrode 200 exposed by the pixel opening 620, a stronger plasma stripping process is subsequently used to remove the pixel definition material. The protective layer 700 covers the pixel electrode 200, which can improve the problem of damage to the pixel electrode 200 caused by the strong plasma stripping process, ensure the device performance of the pixel electrode 200, and avoid the problem that the pixel definition material remains on the surface of the pixel electrode 200, resulting in increased surface roughness of the pixel electrode 200, decreased reflectivity, and deterioration of the image quality of the display panel 10, thereby improving the performance of the display panel 10.

[0098] In some optional embodiments, the orthographic projection of the pixel electrode 200 on the substrate 100 is located within the orthographic projection of the protection layer 700 on the substrate 100 .

[0099] In these optional embodiments, the pixel electrode 200 is completely covered by the protective layer 700, further improving the protection range of the protective layer 700. The protective layer 700 can better protect the pixel electrode 200. In order to reduce the residue of pixel definition material on the surface of the portion of the pixel electrode 200 exposed by the pixel opening 620, a stronger plasma stripping process is subsequently used to remove the pixel definition material. The protective layer 700 covers the pixel electrode 200, which can improve the problem of damage to the pixel electrode 200 caused by the strong plasma stripping process, ensure the device performance of the pixel electrode 200, and avoid the problem that the pixel definition material remains on the surface of the pixel electrode 200, resulting in an increase in the surface roughness of the pixel electrode 200, a decrease in reflectivity, and a deterioration in the image quality of the display panel 10, thereby improving the performance of the display panel 10.

[0100] Optionally, the orthographic projection area of ​​the pixel electrode 200 on the substrate 100 is less than or equal to the orthographic projection area of ​​the protective layer 700 on the substrate 100, that is, the pixel electrode 200 is completely covered by the protective layer 700, further improving the protection range of the protective layer 700. The protective layer 700 can better protect the pixel electrode 200. In order to reduce the residue of pixel definition material on the surface of the portion of the pixel electrode 200 exposed by the pixel opening 620, a stronger plasma stripping process is subsequently used to remove the pixel definition material. The protective layer 700 covers the pixel electrode 200, which can improve the problem of damage to the pixel electrode 200 caused by the strong plasma stripping process, ensure the device performance of the pixel electrode 200, and avoid the problem that the pixel definition material remains on the surface of the pixel electrode 200, resulting in increased surface roughness of the pixel electrode 200, decreased reflectivity, and deterioration of the image quality of the display panel 10, thereby improving the performance of the display panel 10.

[0101] In some optional embodiments, the thickness of the protective layer 700 is greater than or equal to 2 nm and less than or equal to 5 nm. For example, the thickness of the protective layer 700 is 2 nm, 3 nm, 4 nm, 5 nm, etc.

[0102] In these optional embodiments, the thickness of the protective layer 700 is greater than or equal to 2 nm, which can improve the problem that the pixel electrode 200 is easily damaged when the pixel definition material is removed by a strong plasma stripping process due to the small thickness of the protective layer 700. The thickness of the protective layer 700 is less than or equal to 5 nm, which can improve the problem that the material cost of the protective layer 700 is too high due to the large thickness of the protective layer 700.

[0103] See also Figure 2 and Figure 3 , Figure 2 is a partial cross-sectional view of a display panel in another embodiment; Figure 3 is a partial cross-sectional view of a display panel in yet another embodiment.

[0104] like Figure 2 and Figure 3 As shown, optionally, the protection layer 700 includes a first auxiliary light-emitting function layer 701 .

[0105] Optionally, the first auxiliary light-emitting functional layer 701 includes one or more of a hole injection layer (HIL), a hole transport layer (HTL), an electron blocking layer, a hole blocking layer, an electron transport layer (ERL) and an electron injection layer (EIL), so as to realize the normal light emission of the first auxiliary light-emitting functional layer 701 auxiliary light-emitting layer 300.

[0106] Optionally, the orthographic projection of the protective layer 700 on the substrate 100 at least partially overlaps with the orthographic projection of the pixel opening 620 on the substrate 100, that is, the protective layer 700 can cover at least the portion of the pixel electrode 200 exposed by the pixel opening 620. In order to reduce the residue of pixel definition material on the surface of the portion of the pixel electrode 200 exposed by the pixel opening 620, a stronger plasma stripping process is subsequently used to remove the pixel definition material. The protective layer 700 covers at least a portion of the pixel electrode 200, which can improve the problem of damage to the pixel electrode 200 caused by the strong plasma stripping process, ensure the device performance of the pixel electrode 200, and avoid the problem of pixel definition material remaining on the surface of the pixel electrode 200, resulting in increased surface roughness of the pixel electrode 200, decreased reflectivity, and deterioration of the image quality of the display panel 10, thereby improving the performance of the display panel 10.

[0107] Optionally, the protective layer 700 is continuously arranged on the side of the pixel opening 620 facing the substrate 100, that is, the protective layer 700 can completely cover the overlapping area, and the portion of the pixel electrode 200 exposed by the pixel opening 620 can be completely covered by the protective layer 700. The protective layer 700 can better protect the pixel electrode 200. In order to reduce the residue of pixel definition material on the surface of the portion of the pixel electrode 200 exposed by the pixel opening 620, a stronger plasma stripping process is subsequently used to remove the pixel definition material. The protective layer 700 covers the pixel electrode 200, which can improve the problem of damage to the pixel electrode 200 caused by the strong plasma stripping process, ensure the device performance of the pixel electrode 200, and avoid the problem that the pixel definition material remains on the surface of the pixel electrode 200, resulting in an increase in the surface roughness of the pixel electrode 200, a decrease in reflectivity, and a deterioration in the image quality of the display panel 10, thereby improving the performance of the display panel 10.

[0108] Optionally, the protection layer 700 includes a plurality of protection parts that are spaced apart from each other, wherein the protection parts at least partially overlap with the overlapping area in the orthographic projection of the substrate 100 , and the protection parts are spaced apart from each other.

[0109] Optionally, the protection layer 700 is continuously disposed at the gaps between the plurality of pixel openings.

[0110] In some optional embodiments, the material of the protection layer 700 includes insulating material.

[0111] In some optional embodiments, the material of the protection layer 700 includes an inorganic material.

[0112] For example, the material of the protective layer 700 includes silicon dioxide or silicon oxide.

[0113] Please also read Figure 4 and Figure 5 , Figure 4is a partial cross-sectional view of a display panel in yet another embodiment; Figure 5 is a partial cross-sectional view of a display panel in yet another embodiment.

[0114] like Figure 4 and Figure 5 As shown, in some optional embodiments, a hollow portion 710 is provided on the protective layer 700, and the orthographic projection of the hollow portion 710 on the substrate 100 at least partially overlaps with the orthographic projection of the pixel opening 620 on the substrate 100. For example, the orthographic projection of the hollow portion 710 on the substrate 100 at least partially overlaps with the orthographic projection of the overlapping region on the substrate 100.

[0115] In these optional embodiments, when the protective layer 700 is an inorganic insulating material, the protective layer 700 needs to be etched to form a hollow portion 710 to expose the pixel electrode 200 from the hollow portion 710, and the orthographic projection of the hollow portion 710 on the substrate 100 at least partially overlaps with the orthographic projection of the pixel opening 620 on the substrate 100, that is, the hollow portion 710 and the pixel opening 620 are connected to each other, and the pixel electrode 200 can be exposed from the pixel opening 620 through the hollow portion 710, so that the pixel electrode 200 contacts the light-emitting layer 300, thereby realizing the pixel electrode 200's control over the light-emitting layer 300.

[0116] like Figure 4 As shown, in some optional embodiments, the orthographic projection of the hollow portion 710 on the substrate 100 is located within the orthographic projection of the pixel opening 620 on the substrate 100. For example, the orthographic projection of the hollow portion 710 on the substrate 100 is located within the orthographic projection of the overlapping region on the substrate 100.

[0117] In these optional embodiments, the hollow portion 710 is fully connected to the pixel opening 620, so that the portion of the pixel electrode 200 exposed by the hollow portion 710 can be completely exposed by the pixel opening 620, thereby increasing the contact area between the pixel electrode 200 and the light-emitting layer 300, thereby increasing the light-emitting area.

[0118] like Figure 5 As shown, optionally, the orthographic projection of the pixel opening 620 on the substrate 100 is located within the orthographic projection of the hollow portion 710 on the substrate 100, so that the area of ​​the pixel electrode 200 exposed by the pixel opening 620 is further increased, further increasing the contact area between the pixel electrode 200 and the light-emitting layer 300, thereby increasing the light-emitting area.

[0119] In some optional embodiments, the material of the pixel defining portion 610 includes a black opaque material.

[0120] In these optional embodiments, the black opaque material has good light absorption and can reduce the overall reflectivity of the display panel 10 . The black opaque material can absorb stray light entering the film layer, reduce light diffraction, and improve the display effect of the display panel 10 .

[0121] In some optional embodiments, the display panel 10 further includes: a light emitting layer 300 , at least a portion of the light emitting layer 300 is located in the pixel opening 620 .

[0122] In these optional embodiments, the light emitting layer 300 is located within the pixel opening 620 to achieve normal light emission of the display panel 10 .

[0123] like Figure 2 and Figure 3 As shown, optionally, the light-emitting layer 300 includes a second auxiliary light-emitting functional layer 310, which is located on a side of the light-emitting layer 300 away from the substrate 100. Optionally, the second auxiliary light-emitting functional layer 310 includes one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer; the second auxiliary light-emitting functional layer 310 covers the pixel opening 620 and the side of the pixel defining portion 610 away from the substrate 100.

[0124] Optionally, the second auxiliary light-emitting functional layer 310 includes one or more of a hole blocking layer, an electron transport layer, and an electron injection layer; the protective layer 700 includes one or more of a hole injection layer, a hole transport layer, and an electron blocking layer; or, the second auxiliary light-emitting functional layer 310 includes one or more of a hole injection layer, a hole transport layer, and an electron blocking layer; the protective layer 700 includes one or more of a hole blocking layer, an electron transport layer, and an electron injection layer. The second auxiliary light-emitting functional layer 310 and the protective layer 700 jointly assist the light-emitting layer 300 in emitting light, thereby realizing the normal display function of the display panel 10. For example, the second auxiliary light-emitting functional layer 310 includes a hole blocking layer, an electron transport layer, and an electron injection layer, the protective layer 700 includes a hole blocking layer, an electron transport layer, and an electron injection layer, the second auxiliary light-emitting functional layer 310, the light-emitting layer 300, and the protective layer 700 form a complete light-emitting structure, thereby realizing the normal display function of the display panel 10.

[0125] Optionally, the second auxiliary light-emitting function layer 310 is continuously disposed at the gaps between the plurality of pixel openings.

[0126] like Figure 3 As shown, optionally, the display panel 10 further includes: a third auxiliary light-emitting function layer 320 , located between the light-emitting layer 300 and the protective layer 700 ; the third auxiliary light-emitting function layer 320 covers the pixel opening 620 and the side of the pixel defining portion 610 away from the substrate 100 .

[0127] Optionally, the second auxiliary light-emitting functional layer 310 includes one or more of a hole blocking layer, an electron transport layer, and an electron injection layer; the third auxiliary light-emitting functional layer 320 includes one or more of a hole injection layer, a hole transport layer, and an electron blocking layer; or, the second auxiliary light-emitting functional layer 310 includes one or more of a hole injection layer, a hole transport layer, and an electron blocking layer; the third auxiliary light-emitting functional layer 320 includes one or more of a hole blocking layer, an electron transport layer, and an electron injection layer. The second auxiliary light-emitting functional layer 310 and the third auxiliary light-emitting functional layer 320 jointly assist the light-emitting layer 300 in emitting light, thereby realizing the normal display function of the display panel 10. For example, the second auxiliary light-emitting functional layer 310 includes a hole blocking layer, an electron transport layer, and an electron injection layer, the third auxiliary light-emitting functional layer 320 includes a hole blocking layer, an electron transport layer, and an electron injection layer, the second auxiliary light-emitting functional layer 310, the light-emitting layer 300, and the third auxiliary light-emitting functional layer 320 form a complete light-emitting structure, thereby realizing the normal display function of the display panel 10.

[0128] Optionally, the third auxiliary light-emitting function layer 320 is continuously disposed at the gaps between the plurality of pixel openings.

[0129] Optionally, the third auxiliary light-emitting functional layer 320 includes one or more of a hole transport layer and an electron blocking layer, and the protective layer 700 includes one or more of a hole injection layer and a hole transport layer. For example, the third auxiliary light-emitting functional layer 320 includes a hole transport layer and an electron blocking layer, and the protective layer 700 includes a hole injection layer. Alternatively, for example, the third auxiliary light-emitting functional layer 320 includes an electron blocking layer, and the protective layer 700 includes a hole transport layer and a hole injection layer.

[0130] Optionally, the third auxiliary light-emitting functional layer 320 includes one or more of a hole blocking layer and an electron transport layer, and the protective layer 700 includes one or more of an electron transport layer and an electron injection layer. For example, the third auxiliary light-emitting functional layer 320 includes a hole blocking layer and an electron transport layer, and the protective layer 700 includes an electron injection layer. For example, the third auxiliary light-emitting functional layer 320 includes a hole blocking layer, and the protective layer 700 includes an electron transport layer and an electron injection layer. In some optional embodiments, the display panel 10 also includes: a first electrode layer 500, located on the side of the light-emitting layer 300 facing away from the substrate 100.

[0131] In these optional embodiments, one of the pixel electrode 200 and the first electrode layer 500 serves as the anode of the light-emitting layer 300, and the other serves as the cathode of the light-emitting layer 300. In the embodiment of the present application, the pixel electrode 200 is used as the anode of the light-emitting layer 300, and the first electrode layer 500 is used as the cathode of the light-emitting layer 300. For example, the anode, the hole injection layer, the hole transport layer, the electron blocking layer, the light-emitting layer 300, the hole blocking layer, the electron transport layer, the electron injection layer, and the cathode are sequentially stacked along the thickness direction of the substrate.

[0132] Optionally, the display panel 10 further includes an encapsulation layer, and the encapsulation layer is located on a side of the first electrode layer 500 facing away from the substrate 100 , so as to achieve encapsulation of the display panel 10 .

[0133] See also Figure 6 , Figure 6 is a partial cross-sectional view of a display panel in yet another embodiment.

[0134] like Figure 6 As shown, in some optional embodiments, the encapsulation layer includes: a first encapsulation layer 400 located on a side of the first electrode layer 500 facing away from the substrate 100 .

[0135] In these optional embodiments, the first encapsulation layer 400 can achieve encapsulation of the light-emitting layer 300 , prevent water and oxygen from invading the light-emitting layer 300 , and increase the service life of the light-emitting layer 300 .

[0136] See also Figure 7 , Figure 7 is a partial cross-sectional view of a display panel in yet another embodiment.

[0137] like Figure 7 As shown, in some optional embodiments, the encapsulation layer further includes: a second encapsulation layer 410 located on a side of the first encapsulation layer 400 facing away from the substrate 100 .

[0138] Optionally, the encapsulation layer further includes: a third encapsulation layer 420 located on a side of the second encapsulation layer 410 facing away from the substrate 100 .

[0139] In these optional embodiments, the display panel 10 adopts three-layer packaging, which has better packaging performance and reduces the possibility of water and oxygen intrusion.

[0140] In some optional embodiments, the material of the first encapsulation layer 400 includes an inorganic material.

[0141] In these optional embodiments, the first encapsulation layer 400 includes an inorganic material, which has good density and good barrier properties against water vapor and oxygen.

[0142] In some optional embodiments, the material of the second encapsulation layer 410 includes an organic material.

[0143] Optionally, the material of the third encapsulation layer 420 includes an inorganic material.

[0144] In these optional embodiments, the first encapsulation layer 400, the second encapsulation layer 410 and the third encapsulation layer 420 are encapsulated with inorganic materials, organic materials and inorganic materials respectively to form a TFE (Thin Film Encapsulation, TFE) thin film encapsulation structure to further improve the encapsulation performance.

[0145] See also Figure 8 , Figure 8 is a partial cross-sectional view of a display panel in yet another embodiment.

[0146] like Figure 8 As shown, in some optional embodiments, the display panel 10 further includes: a touch layer 800 located on a side of the encapsulation layer away from the substrate 100 .

[0147] In these optional embodiments, the touch layer 800 is disposed on a side of the encapsulation layer facing away from the substrate 100 , so as to realize the touch function of the display panel 10 .

[0148] In some optional embodiments, the touch layer 800 includes a first conductive layer 810 and a second conductive layer 820 , and the second conductive layer 820 is located on a side of the first conductive layer 810 facing away from the substrate 100 .

[0149] In these optional embodiments, the first conductive layer 810 and the second conductive layer 820 are stacked to cooperate with each other to form a touch layer 800 with a touch function.

[0150] In some optional embodiments, one of the first conductive layer 810 and the second conductive layer 820 includes a touch electrode 821 , and the other of the first conductive layer 810 and the second conductive layer 820 includes a connecting portion 811 , and a portion of the touch electrode 821 is electrically connected to the connecting portion 811 .

[0151] In these optional embodiments, the plurality of touch electrodes 821 of the second conductive layer 820 are electrically connected to each other through the connection portion 811 of the first conductive layer 810 to achieve full-surface touch control of the display panel 10 and improve the touch performance of the display panel 10 .

[0152] In some optional embodiments, the orthographic projection of the touch electrode 821 on the substrate 100 is located within the orthographic projection of the pixel defining portion 610 on the substrate 100 .

[0153] In these optional embodiments, the touch electrode 821 is disposed in the area where the pixel defining portion 610 is located, which can prevent the touch electrode 821 from blocking the light emitted by the light-emitting layer 300 and ensure the display effect of the display panel 10 .

[0154] In some optional embodiments, the orthographic projection of the connecting portion 811 on the substrate 100 is located within the orthographic projection of the pixel defining portion 610 on the substrate 100 .

[0155] In these optional embodiments, the connection portion 811 is disposed in the area where the pixel defining portion 610 is located, which can prevent the connection portion 811 from blocking the light emitting layer 300 , thereby ensuring the display effect of the display panel 10 .

[0156] See also Fig. 9 , Fig. 9 is a partial cross-sectional view of a display panel in yet another embodiment.

[0157] like Fig. 9 As shown, in some optional embodiments, the display panel 10 further includes: a filter layer 900, located on the side of the encapsulation layer away from the substrate 100, the filter layer 900 includes a filter portion 910, a black matrix 920 is arranged between adjacent filter portions 910, and the black matrix 920 is located between the filter portions 910.

[0158] In these optional embodiments, the filter unit 910 filters the light emitted by the light emitting layer 300, so that the filter unit 910 can emit light of the same color as the filter unit 910, for example, light transmits red light through the red filter unit 910, transmits green light through the green filter unit 910, and transmits blue light through the blue filter unit 910. The black matrix 920 is arranged between adjacent filter units 910, which can avoid color mixing between adjacent filter units 910 and improve the display effect of the display panel 10.

[0159] Optionally, the filter layer 900 is located on a side of the touch layer 800 facing away from the substrate 100 .

[0160] Optionally, the orthographic projection of the touch electrode 821 on the substrate 100 is located within the orthographic projection of the black matrix 920 on the substrate 100. The black matrix 920 can absorb incident light in the area where the touch electrode 821 is located, preventing the incident light from reaching the touch electrode 821 and being reflected by the touch electrode 821, thereby affecting the display effect of the display panel 10.

[0161] Optionally, the orthographic projection of the connecting portion 811 on the substrate 100 is located within the orthographic projection of the black matrix 920 on the substrate 100 , and the black matrix 920 can absorb incident light in the area where the connecting portion 811 is located, preventing the incident light from reaching the connecting portion 811 and being reflected by the connecting portion 811 , thereby affecting the display effect of the display panel 10 .

[0162] The structural design in this embodiment can be applied to other display panels 10 , and the specific selection can be made according to actual conditions, and this application does not impose any specific restrictions on it.

[0163] The embodiment of the second aspect of the present application further provides a display device, comprising the display panel 10 of any of the above embodiments. Since the display device provided by the embodiment of the second aspect of the present application comprises the display panel 10 of any of the above embodiments, the display device provided by the embodiment of the second aspect of the present application has the beneficial effects of the display panel 10 of any of the above embodiments, which will not be described in detail here.

[0164] The display device in the embodiments of the present application includes but is not limited to mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, consoles, and other devices with display functions.

[0165] The third aspect of the present application also provides a method for preparing a display panel 10. The display panel 10 may be the display panel 10 provided by any of the above embodiments. Figures 1 to 10 , Fig.10 1 is a schematic flow chart of a method for preparing a display panel provided in an embodiment of the present application. The preparation method comprises:

[0166] Step S01: preparing pixel electrodes on a substrate.

[0167] Step S02: preparing a protective layer on the side of the pixel electrode facing away from the substrate.

[0168] Step S03: preparing a pixel definition layer, the pixel definition layer comprising a pixel definition portion and a pixel opening enclosed by the pixel definition portion, and an orthographic projection of the pixel electrode on the substrate and an orthographic projection of the pixel opening on the substrate have an overlapping area.

[0169] According to the preparation method of the third aspect of the present application, the pixel electrode 200 is prepared by step S01, and the pixel electrode 200 serves as the light-emitting electrode of the light-emitting layer 300 to control the light emission of the light-emitting layer 300. The protective layer 700 is prepared by step S02. The pixel definition layer 600 is prepared by step S03. The pixel definition part 610 of the pixel definition layer 600 encloses and forms a pixel opening 620 to set the light-emitting layer 300 and realize the normal light emission of the light-emitting layer 300. In addition, the pixel definition part 610 defines the setting area of ​​each light-emitting layer 300 to reduce the cross-color defect between each light-emitting layer 300. The protective layer 700 can cover at least a portion of the pixel electrode 200. In order to reduce the residue of pixel definition material on the surface of the portion of the pixel electrode 200 exposed by the pixel opening 620, a stronger plasma stripping process is subsequently used to remove the pixel definition material. The protective layer 700 covers at least a portion of the pixel electrode 200, which can improve the problem of damage to the pixel electrode 200 caused by the strong plasma stripping process, ensure the device performance of the pixel electrode 200, and avoid the problem that the pixel definition material remains on the surface of the pixel electrode 200, resulting in an increase in the surface roughness of the pixel electrode 200, a decrease in reflectivity, and a deterioration in the image quality of the display panel 10, thereby improving the performance of the display panel 10.

[0170] In some optional embodiments, before step S03 , that is, before preparing the pixel definition layer, in step S02 , the method further includes: preparing an insulating material layer on a side of the pixel electrode 200 facing away from the substrate 100 .

[0171] In some optional embodiments, after step S03, that is, after forming the pixel opening, the method further includes: patterning the insulating material layer to obtain a protective layer 700 having a hollow portion 710, wherein the orthographic projection of the hollow portion 710 on the substrate 100 at least partially overlaps the orthographic projection of the pixel opening 620 on the substrate 100. The insulating material layer includes an inorganic material, such as silicon dioxide or silicon oxide.

[0172] In these optional embodiments, when the protective layer 700 is an insulating material, the protective layer 700 needs to be etched to form a hollow portion 710 to expose the pixel electrode 200 from the hollow portion 710, and the orthographic projection of the hollow portion 710 on the substrate 100 at least partially overlaps with the orthographic projection of the pixel opening 620 on the substrate 100, that is, the hollow portion 710 and the pixel opening 620 are connected to each other, and the pixel electrode 200 can be exposed from the pixel opening 620 through the hollow portion 710, so that the pixel electrode 200 contacts the light-emitting layer 300, thereby realizing the pixel electrode 200 controlling the light emission of the light-emitting layer 300.

[0173] In some optional embodiments, in step S02, the method further includes:

[0174] An auxiliary light-emitting material layer is prepared on the side of the pixel electrode 200 facing away from the substrate 100 , and the auxiliary light-emitting material layer is patterned to form a protective layer 700 .

[0175] Optionally, the material of the protective layer 700 includes one or more of a hole injection material, a hole transport material, an electron blocking material, a hole blocking material, an electron transport material and an electron injection material.

[0176] In these optional embodiments, when the material of the protective layer 700 is a hole injection material, the protective layer 700 of the hole injection material can serve as a hole injection layer (HIL) of the subsequent light-emitting layer 300. When the light-emitting layer 300 is subsequently prepared, only a hole transport layer (HTL), a light-emitting material layer, an electron transport layer (ETL) and an electron injection layer (EIL) need to be prepared, which can constitute a complete light-emitting layer 300 with the hole injection layer (HIL) to achieve the normal display function of the light-emitting layer 300. Alternatively, when the light-emitting layer 300 is subsequently prepared, a whole layer of hole injection layer (HIL) is prepared to improve the light-emitting reliability of the light-emitting layer 300, so as to avoid the problem that the protective layer 700 of the hole injection material is damaged and the normal light-emitting layer 300 is subsequently affected.

[0177] Optionally, after step S03, the method further includes:

[0178] The light-emitting layer 300 and the second auxiliary light-emitting functional layer 310 are prepared in sequence.

[0179] In these optional embodiments, when the material of the protective layer 700 is one or more of hole injection material, hole transport material, electron blocking material, hole blocking material, electron transport material and electron injection material, the second auxiliary light-emitting function layer 310 and the protective layer 700 jointly assist the light-emitting layer 300 in emitting light.

[0180] According to the embodiments described above, these embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The present application is limited only by the claims and their full scope and equivalents.

[0181] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0182] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, characterized in that: include: substrate; A pixel definition layer, located on the substrate, the pixel definition layer comprising a pixel definition portion and a pixel opening formed by the pixel definition portion; A pixel electrode is located between the substrate and the pixel definition layer, and an orthographic projection of the pixel electrode on the substrate and an orthographic projection of the pixel opening on the substrate have an overlapping area; A protective layer, at least part of which is located between the pixel electrode and the pixel defining portion; and / or at least part of which is located on a side of the pixel electrode away from the substrate, and the protective layer at least partially overlaps the overlapping area in an orthographic projection of the substrate.

2. The display panel according to claim 1, characterized in that: The orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the protective layer on the substrate; Preferably, the orthographic projection area of ​​the pixel opening on the substrate is less than or equal to the orthographic projection area of ​​the protective layer on the substrate; Preferably, the orthographic projection of the pixel electrode on the substrate is located within the orthographic projection of the protective layer on the substrate; Preferably, an orthographic projection area of ​​the pixel electrode on the substrate is smaller than or equal to an orthographic projection area of ​​the protection layer on the substrate.

3. The display panel according to claim 1, characterized in that: The thickness of the protective layer is greater than or equal to 2 nm and less than or equal to 5 nm.

4. The display panel according to claim 1, characterized in that: The protective layer includes a first auxiliary light-emitting functional layer; Preferably, the first auxiliary light-emitting functional layer includes one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer; Preferably, the protective layer at least partially overlaps the overlapping area in the orthographic projection of the substrate; Preferably, the protective layer is continuously disposed at the pixel opening; Preferably, the protective layer comprises a plurality of protective portions disposed at intervals, wherein the protective portions at least partially overlap with the overlapping region in an orthographic projection of the substrate.

5. The display panel according to claim 1, characterized in that: The material of the protective layer includes insulating material; Preferably, the material of the protective layer includes an inorganic material; Preferably, the material of the protective layer includes silicon dioxide or silicon oxide; Preferably, a hollow portion is provided on the protective layer, and an orthographic projection of the hollow portion on the substrate at least partially overlaps with an orthographic projection of the pixel opening on the substrate; Preferably, the orthographic projection of the hollow portion on the substrate is located within the orthographic projection of the pixel opening on the substrate.

6. The display panel according to claim 1, characterized in that: The material of the pixel defining portion includes a black light-proof material.

7. The display panel according to claim 1, characterized in that: The display panel further includes: a light-emitting layer, at least a portion of which is located at the pixel opening; Preferably, the display panel further comprises: a second auxiliary light-emitting functional layer, located on a side of the light-emitting layer away from the substrate; Preferably, the second auxiliary light-emitting functional layer includes one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer; the second auxiliary light-emitting functional layer covers the pixel opening and a side of the pixel defining portion away from the substrate; Preferably, the second auxiliary light-emitting functional layer includes one or more of a hole blocking layer, an electron transport layer and an electron injection layer; the protective layer includes one or more of a hole injection layer, a hole transport layer and an electron blocking layer; Alternatively, the second auxiliary light-emitting functional layer includes one or more of a hole injection layer, a hole transport layer, and an electron blocking layer; the protective layer includes one or more of a hole blocking layer, an electron transport layer, and an electron injection layer; Preferably, the second auxiliary light-emitting function layer is continuously arranged at the gaps between the plurality of pixel openings; Preferably, the display panel further comprises: a third auxiliary light-emitting functional layer, located between the light-emitting layer and the protective layer; the third auxiliary light-emitting functional layer covers the pixel opening and a side of the pixel defining portion away from the substrate; Preferably, the second auxiliary light-emitting functional layer includes one or more of a hole blocking layer, an electron transport layer and an electron injection layer; the third auxiliary light-emitting functional layer includes one or more of a hole injection layer, a hole transport layer and an electron blocking layer; Alternatively, the second auxiliary light-emitting functional layer includes one or more of a hole injection layer, a hole transport layer, and an electron blocking layer; the third auxiliary light-emitting functional layer includes one or more of a hole blocking layer, an electron transport layer, and an electron injection layer; Preferably, the third auxiliary light-emitting function layer is continuously arranged at the gaps between the plurality of pixel openings; Preferably, the third auxiliary light-emitting functional layer includes one or more of a hole transport layer and an electron blocking layer, and the protective layer includes one or more of a hole injection layer and a hole transport layer; or, the third auxiliary light-emitting functional layer includes one or more of a hole blocking layer and an electron transport layer, and the protective layer includes one or more of an electron transport layer and an electron injection layer; Preferably, the display panel further includes: A first electrode layer, located on a side of the light-emitting layer away from the substrate; Preferably, the display panel further includes: an encapsulation layer, located on a side of the first electrode layer away from the substrate; Preferably, the encapsulation layer comprises: A first encapsulation layer, located on a side of the first electrode layer away from the substrate; Preferably, the encapsulation layer further comprises: a second encapsulation layer, located on a side of the first encapsulation layer away from the substrate; Preferably, the encapsulation layer further comprises: a third encapsulation layer, located on a side of the second encapsulation layer away from the substrate; Preferably, the material of the first encapsulation layer includes an inorganic material; Preferably, the material of the second encapsulation layer includes organic material; Preferably, the material of the third encapsulation layer includes inorganic material; Preferably, the display panel further includes: A touch layer, located on a side of the packaging layer away from the substrate; Preferably, the touch layer comprises a first conductive layer and a second conductive layer, and the second conductive layer is located on a side of the first conductive layer away from the substrate; Preferably, one of the first conductive layer and the second conductive layer includes a touch electrode, the other of the first conductive layer and the second conductive layer includes a connecting portion, and part of the touch electrode is electrically connected to the connecting portion; Preferably, the orthographic projection of the touch electrode on the substrate is located within the orthographic projection of the pixel defining portion on the substrate; Preferably, the orthographic projection of the connecting portion on the substrate is located within the orthographic projection of the pixel defining portion on the substrate; Preferably, the display panel further includes: A filter layer is located on a side of the encapsulation layer away from the substrate, the filter layer comprises filter parts, a black matrix is ​​arranged between adjacent filter parts, and the black matrix is ​​located between the filter parts; Preferably, the filter layer is located on a side of the touch layer facing away from the substrate.

8. A display device, characterized in that: A display panel comprising any one of claims 1 to 7.

9. A method for preparing a display panel, characterized in that: The method comprises: preparing a pixel electrode on a substrate; Preparing a protective layer on a side of the pixel electrode facing away from the substrate; A pixel definition layer is prepared, wherein the pixel definition layer includes a pixel definition portion and a pixel opening enclosed by the pixel definition portion, and an orthographic projection of the pixel electrode on the substrate and an orthographic projection of the pixel opening on the substrate have an overlapping area.

10. The preparation method according to claim 9, characterized in that: Before preparing the pixel definition layer, in the step of preparing a protective layer on the side of the pixel electrode facing away from the substrate, the method further comprises: An insulating material layer is prepared on a side of the pixel electrode facing away from the substrate; the insulating material layer overlaps at least part of the overlapped area with the orthographic projection of the substrate; After forming the pixel opening, the method further includes: Performing patterning on the insulating material layer to obtain a protective layer having a hollow portion, wherein an orthographic projection of the hollow portion on the substrate at least partially overlaps an orthographic projection of the pixel opening on the substrate; Alternatively, in the step of preparing a protective layer on a side of the pixel electrode facing away from the substrate, the method further comprises: Preparing an auxiliary light-emitting material layer on a side of the pixel electrode away from the substrate, and patterning the auxiliary light-emitting material layer to form a protective layer; Preferably, the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the protective layer on the substrate; Preferably, the material of the protective layer includes one or more of hole injection material, hole transport material, electron blocking material, hole blocking material, electron transport material and electron injection material; Preferably, the material of the pixel defining portion includes a black light-proof material; Preferably, after the step of preparing a pixel definition layer on a side of the protective layer facing away from the substrate, the method further comprises: The light-emitting layer and the second auxiliary light-emitting functional layer are prepared in sequence.

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