Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device. The problem that in the prior art, a display product is low in light extraction efficiency is solved. The display panel comprises a substrate, a first pixel definition layer, a first electrode layer and a second pixel definition layer, the first pixel definition layer is located on one side of the substrate, and the first pixel definition layer comprises a first pixel definition part and a plurality of first pixel openings defined by the first pixel definition part; the included angle between the side wall of the first pixel opening and the substrate is larger than or equal to 40 degrees and smaller than or equal to 90 degrees. The first electrode layer comprises a plurality of first electrodes arranged at intervals, parts of the first electrodes are located in the first pixel openings, and the first electrodes cover the side walls of the first pixel openings and extend to the sides, away from the substrate, of the first pixel defining parts; the second pixel definition layer comprises at least one second pixel definition part, and the second pixel definition part at least covers the first electrode on the side wall of the first pixel opening and the first electrode on the side, away from the substrate, of the first pixel definition part.

Description

Technical Field

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

[0002] Organic Light Emitting Display (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 light extraction efficiency of current display products still needs to be improved. Summary of the invention

[0004] In view of this, embodiments of the present application provide a display panel and a method for manufacturing the same, and a display device to solve the problem of low light extraction efficiency of existing display products.

[0005] In a first aspect, the present application provides a display panel, which includes a substrate, a first pixel definition layer, a first electrode layer, and a second pixel definition layer. The first pixel definition layer is located on one side of the substrate, and the first pixel definition layer includes a first pixel definition portion and a plurality of first pixel openings enclosed by the first pixel definition portion; an angle between a side wall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees; the first electrode layer includes a plurality of first electrodes arranged at intervals, a portion of the first electrode is located in the first pixel opening, and the first electrode covers the side wall of the first pixel opening and extends to a side of the first pixel definition portion facing away from the substrate; the second pixel definition layer includes at least one second pixel definition portion, and the second pixel definition portion at least covers the first electrode on the side wall of the first pixel opening and the first electrode on a side of the first pixel definition portion facing away from the substrate.

[0006] In one embodiment, the second pixel definition portion encloses a second pixel opening, and the orthographic projection of the second pixel opening on the substrate is located within the orthographic projection of the first pixel opening on the substrate; preferably, the distance between the edge of the orthographic projection of the second pixel opening on the substrate and the edge of the orthographic projection of the first pixel opening on the substrate is greater than 0 microns and less than or equal to 5 microns; preferably, the distance between the edge of the orthographic projection of the second pixel opening on the substrate and the edge of the orthographic projection of the first pixel opening on the substrate is greater than 0 microns and less than or equal to 1 micron; preferably, the thickness of the first electrode covering the side of the first pixel definition portion facing away from the substrate is greater than 0 microns and less than or equal to 5 microns; preferably, the thickness of the first electrode covering the side of the first pixel definition portion facing away from the substrate is greater than 0 microns and less than or equal to 1 micron.

[0007] In one embodiment, the surface of the second pixel defining portion covering the first electrode and facing away from the substrate includes an arc surface; preferably, the substrate includes a substrate and a flat layer, and the flat layer is located between the substrate and the first pixel defining layer; preferably, the material of the flat layer is the same as that of the first pixel defining layer; preferably, the flat layer and the first pixel defining layer are integrally formed.

[0008] In one embodiment, at least one second pixel defining portion includes at least two second pixel defining portions, and adjacent two second pixel defining portions are spaced apart; preferably, an isolation structure is further included, and the isolation structure is located on the side of the first pixel defining layer facing away from the substrate and between adjacent second pixel defining portions; preferably, the isolation structure is connected to the second pixel defining portion; or, the isolation structure and the second pixel defining portion are spaced apart; preferably, in a first direction perpendicular to the display panel, at least one isolation structure is provided between adjacent second pixel defining portions; preferably, in a first direction perpendicular to the display panel, the cross-sectional shape of the isolation structure includes at least one of an inverted trapezoid and a parallelogram; preferably, the material of the isolation structure is the same as that of the second pixel defining layer; preferably, the isolation structure and the second pixel defining layer are integrally formed.

[0009] In one embodiment, a light-emitting functional layer and a second electrode stacked on the first electrode are further included; preferably, the light-emitting functional layer includes a light-emitting layer, and the light-emitting layer is located within the first pixel opening; preferably, the light-emitting functional layer further includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer located between the first electrode and the light-emitting layer; preferably, the light-emitting functional layer further includes at least one of an electron injection layer, an electron transport layer, and a hole blocking layer located between the second electrode and the light-emitting layer; preferably, the light-emitting layer includes a single light-emitting layer; or, the light-emitting layer includes at least two light-emitting layers; preferably, the at least two light-emitting layers include a first sub-light-emitting layer and a second sub-light-emitting layer, and the second sub-light-emitting layer is located on the side of the first sub-light-emitting layer facing away from the first electrode; preferably, the light-emitting functional layer further includes a charge generation layer, and the charge generation layer is located between the first sub-light-emitting layer and the second sub-light-emitting layer; preferably, at least one of a hole blocking layer and an electron transport layer is further included between the first sub-light-emitting layer and the charge generation layer; preferably, at least one of a hole transport layer and an electron blocking layer is further included between the charge generation layer and the second sub-light-emitting layer; preferably, the second electrode is disconnected at the isolation structure.

[0010] In one embodiment, the light-emitting functional layer includes a light-emitting layer, which is located within the first pixel opening; preferably, the light-emitting layer includes a host material, a sensitizer, and a dye; preferably, the dye is a boron-containing fluorescent dye or a boron-containing resonance-type thermally activated delayed fluorescence material; preferably, the sensitizer includes a phosphorescent material; preferably, the sensitizer includes a phosphorescent material containing characteristic elements, and the characteristic elements include iridium, platinum, gold, silver, osmium, or copper; preferably, the host material is selected from a thermally activated delayed fluorescence material, or a composition of a P-type material and an N-type material.

[0011] In one embodiment, it further includes a thin-film encapsulation layer, which is located on the side of the second electrode away from the substrate; preferably, the thin-film encapsulation layer includes a first encapsulation layer, a second encapsulation layer, and a third encapsulation layer stacked in sequence on the side of the second electrode away from the substrate; preferably, the first encapsulation layer and the second encapsulation layer include an inorganic encapsulation layer; preferably, the second encapsulation layer includes an organic encapsulation layer.

[0012] In one embodiment, it further includes a refractive layer, which is located between the first encapsulation layer and the second encapsulation layer; preferably, the orthographic projection of the refractive layer on the substrate is located within the orthographic projection of the first pixel opening on the substrate; preferably, the refractive index of the refractive layer is greater than or equal to 1.5 and less than or equal to 2.

[0013] The second aspect of the present application provides a method for manufacturing a display panel, including: preparing a planarization layer and a first pixel definition layer on a substrate, the first pixel definition layer including a first pixel definition portion and a plurality of first pixel openings surrounded by the first pixel definition portion; the included angle between the sidewall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees; preparing a first electrode layer on the side of the first pixel definition layer away from the substrate, the first electrode layer including a plurality of first electrodes arranged at intervals, a part of the first electrode is located within the first pixel opening, and the first electrode covers the sidewall of the first pixel opening and extends to the side of the first pixel definition layer away from the substrate; preparing a second pixel definition layer and an isolation structure on the side of the first electrode layer and the first pixel definition layer away from the substrate, the second pixel definition layer including at least two second pixel definition portions, and the second pixel definition portion at least covers the first electrode on the sidewall of the first pixel opening and the first electrode on the side of the first pixel definition portion away from the substrate; two adjacent second pixel definition portions are arranged at intervals, and the isolation structure is located on the side of the first pixel definition layer away from the substrate and between adjacent second pixel definition portions.

[0014] In one embodiment, preparing the second pixel defining layer and the isolation structure on the side of the first electrode layer and the first pixel defining layer facing away from the substrate includes: preparing a first organic material layer on the side of the first electrode layer and the first pixel defining layer facing away from the substrate, and patterning the first organic material layer to obtain the second pixel defining layer and the isolation structure; preferably, patterning the first organic material layer includes: patterning the first organic material layer using a semi-etch process; preferably, preparing the planarization layer and the first pixel defining layer on the substrate includes: preparing a second organic material layer on the substrate, and patterning the second organic material layer to obtain the planarization layer and the first pixel defining layer.

[0015] The third aspect of the present application provides a display device, including the above-mentioned display panel, or a display panel obtained by the above-mentioned manufacturing method.

[0016] The embodiments of the present application provide a display panel, a manufacturing method thereof, and a display device. The display panel includes a substrate, a first pixel defining layer, a first electrode layer, and a second pixel defining layer. The first pixel defining layer is located on one side of the substrate. The first pixel defining layer includes a first pixel defining portion and a plurality of first pixel openings surrounded by the first pixel defining portion; the included angle between the side wall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees; the first electrode layer includes a plurality of first electrodes arranged at intervals, a part of the first electrode is located in the first pixel opening, and the first electrode covers the side wall of the first pixel opening and extends to the side of the first pixel defining portion facing away from the substrate; the second pixel defining layer includes at least one second pixel defining portion, and the second pixel defining portion covers at least the first electrode on the side wall of the first pixel opening and the first electrode on the side of the first pixel defining portion facing away from the substrate. In the above embodiment, by covering the side wall of the first pixel opening with the first electrode and extending it to the side of the first pixel defining portion facing away from the substrate, the reflection of the light of the light-emitting device of the display panel is improved, thereby improving the light extraction efficiency of the display panel. Further, the included angle between the side wall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees, so that the light of the light-emitting device can be better reflected. Further, the second pixel defining portion covers at least the first electrode on the side wall of the first pixel opening and the first electrode on the side of the first pixel defining portion facing away from the substrate, so that the first electrode is insulated from the organic structure of the light-emitting device. Description of the Drawings

[0017] By describing the embodiments of the present application in more detail in conjunction with the drawings, the above-mentioned and other objects, features, and advantages of the present application will become more obvious. The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1 It is a schematic cross-sectional structure diagram of a display panel provided by the first embodiment of the present application.

[0019] Figure 2 is Figure 1 A partially enlarged structure schematic diagram of the display panel shown.

[0020] Figure 3a is Figure 1 A schematic structure diagram of a light-emitting device of the display panel shown.

[0021] Figure 3b is Figure 1 Another schematic structure diagram of a light-emitting device of the display panel shown.

[0022] Figure 4 It is a schematic cross-sectional structure diagram of a display panel provided by the second embodiment of the present application.

[0023] Figure 5 It is a schematic cross-sectional structure diagram of a display panel provided by the third embodiment of the present application.

[0024] Figure 6a is Figure 5 A schematic cross-sectional structure diagram of an isolation structure of the display panel shown.

[0025] Figure 6b It is a schematic cross-sectional structure diagram of an isolation structure of a display panel provided by the fourth embodiment of the present application.

[0026] Figure 7 It is a schematic cross-sectional structure diagram of a display panel provided by the fifth embodiment of the present application.

[0027] Figure 8 It is a schematic cross-sectional structure diagram of a display panel provided by the sixth embodiment of the present application.

[0028] Figure 9 It is a schematic cross-sectional structure diagram of a display panel provided by the seventh embodiment of the present application.

[0029] Figure 10 It is a schematic cross-sectional structure diagram of a display panel provided by the eighth embodiment of the present application.

[0030] Figure 11 It is a schematic flow diagram of a method for manufacturing a display panel provided by an embodiment of the present application. Detailed implementation manners

[0031] Organic Light Emitting Display (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.

[0032] The EQE (External Quantum Efficiency) of the current organic electroluminescent device OLED is 20%, and EQE is determined by IQE (internal quantum efficiency) and light extraction efficiency. Currently, almost 100% IQE can be achieved by adopting carrier-balanced OLED device structures and efficient triplet harvesting emitters such as phosphorescent materials. Therefore, improving light extraction is crucial to further improve the EQE of OLED displays.

[0033] In view of this, the embodiment of the present application provides a display panel and a preparation method thereof and a display device, wherein the display panel includes a substrate, a first pixel definition layer, a first electrode layer and a second pixel definition layer, wherein the first pixel definition layer is located on one side of the substrate, and the first pixel definition layer includes a first pixel definition portion and a plurality of first pixel openings enclosed by the first pixel definition portion; the angle between the side wall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees; the first electrode layer includes a plurality of first electrodes arranged at intervals, wherein the first electrode portion is located in the first pixel opening, and the first electrode covers the side wall of the first pixel opening and extends to the side of the first pixel definition portion away from the substrate; the second pixel definition layer includes at least one second pixel definition portion, and the second pixel definition portion at least covers the first electrode on the side wall of the first pixel opening and the first electrode on the side of the first pixel definition portion away from the substrate. In the above embodiment, the first electrode covers the side wall of the first pixel opening and extends to the side of the first pixel definition portion away from the substrate, thereby improving the light extraction efficiency of the display panel. Furthermore, the angle between the sidewall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees, so that the light of the light-emitting device is better reflected. Furthermore, the second pixel definition portion at least covers the first electrode on the sidewall of the first pixel opening and the first electrode on the side of the first pixel definition portion away from the substrate, so that the first electrode and the organic structure of the light-emitting device are insulated.

[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0035] In the drawings, for the sake of clarity of illustration, the dimensions of layers and regions may be exaggerated. It can be understood that when a structure is referred to as being "on or under" another structure, the structure can be directly on or under the other structure, or there may also be an intermediate structure. The same reference numerals always indicate the same structure. The structures mentioned here include any one of a film layer, an element, a device, a component, and a module.

[0036] When a structure is referred to as being "connected" to another structure, the structure can be directly connected to the other structure, or indirectly connected to the other structure in such a way that one or more intermediate structures are disposed therebetween.

[0037] In this specification, "electrically connected" includes the case where components are connected together through an element having a certain electrical effect. There is no particular limitation on the "element having a certain electrical effect" as long as it can transfer electrical signals between the components to be connected. Examples of the "element having a certain electrical effect" include not only electrodes and wirings, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements having various functions.

[0038] In this specification, the "same-layer setting" adopted means that two (or more than two) structures are formed by the same patterning process, and their materials may be the same or different.

[0039] In addition, for better illustration of the present application, numerous specific details are given in the following specific embodiments. Those skilled in the art should understand that the present application can also be implemented without some specific details. In some instances, methods and means well-known to those skilled in the art are not described in detail so as to highlight the gist of the present application.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In addition, if terms such as "first" and "second" appear, they are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0042] Figure 1 is a schematic cross-sectional structure diagram of a display panel provided by the first embodiment of the present application. Figure 2yes Figure 1 The partially enlarged cross-sectional structure diagram of the display panel shown in FIG. Figure 1 and Figure 2 As shown, the display panel includes a substrate 10, a first pixel definition layer 20, a first electrode layer and a second pixel definition layer 40. The first pixel definition layer 20 is located on one side of the substrate 10. The first pixel definition layer 20 includes a first pixel definition portion 21 and a plurality of first pixel openings 22 enclosed by the first pixel definition portion 21. The angle a between the sidewall of the first pixel opening 22 and the substrate 10 is greater than or equal to 40 degrees and less than or equal to 90 degrees. The first electrode layer includes a plurality of first electrodes 31 arranged at intervals. The first electrodes 31 are partially located in the first pixel openings 22. The first electrodes 31 cover the sidewalls of the first pixel openings 22 and extend to the side of the first pixel definition portion 21 away from the substrate 10. The second pixel definition layer 40 includes at least one second pixel definition portion 41. The second pixel definition portion 41 at least covers the first electrode 31 on the sidewall of the first pixel opening 22 and the first electrode 31 on the side of the first pixel definition portion 21 away from the substrate 10.

[0043] The above embodiment improves the reflection of the light of the light-emitting device of the display panel by covering the side wall of the first pixel opening with the first electrode and extending it to the side of the first pixel definition part away from the substrate, thereby improving the light extraction efficiency of the display panel. Furthermore, the angle between the side wall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees, so that the light of the light-emitting device is better reflected. Furthermore, the second pixel definition part at least covers the first electrode on the side wall of the first pixel opening and the first electrode on the side of the first pixel definition part away from the substrate, so that the first electrode and the organic structure of the light-emitting device are insulated.

[0044] Among them, the substrate 10 can be a substrate substrate. In some embodiments, the substrate substrate can be a glass-based substrate. In some embodiments, the substrate substrate can include an organic resin material such as epoxy resin, triazine, silicone resin or polyimide. For example, the substrate substrate can be an FR4 type printed circuit board (Printed circuit board, PCB), or it can be a flexible PCB that is easy to deform. In some embodiments, the substrate substrate can include a ceramic material such as silicon nitride, aluminum nitride or aluminum oxide, or include a metal or a metal compound. For example, the substrate substrate can be a metal core printed circuit board (Metal Core PCB, MCPCB) or a metal copper clad laminate (Metal Copper Clad Laminate, MCCL).

[0045] Further, in one embodiment, the substrate 10 may have a driving circuit for driving a plurality of light-emitting devices 13 to emit light of corresponding colors. For example, the substrate 10 may include a substrate layer, a barrier layer, a buffer layer, a gate insulator (GI), a capacitance insulator (CI), a gate, source and drain electrodes, an interlayer dielectric (ILD), etc.

[0046] Specifically, in one embodiment, the substrate 10 includes a substrate 11 and a planarization layer 12, and the planarization layer 12 is located between the substrate 11 and the first pixel definition layer 20.

[0047] Optionally, in one embodiment, the material of the planarization layer 12 is the same as that of the first pixel definition layer 20.

[0048] Optionally, in one embodiment, the planarization layer 12 and the first pixel definition layer 20 are integrally formed, that is, when the structure of the planarization layer 12 is formed, the structure of the first pixel definition layer 20 is formed synchronously, which simplifies the manufacturing process of the display panel.

[0049] Optionally, in one embodiment, the included angle a between the side wall of the first pixel opening 22 and the substrate 10 is greater than or equal to 40 degrees and less than or equal to 90 degrees. For example, the included angle a between the side wall of the first pixel opening 22 and the substrate 10 may be 40 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees, etc.

[0050] Optionally, in one embodiment, the thickness H of the first electrode 31 covering the side of the first pixel definition portion 21 facing away from the substrate 10 is greater than 0 microns and less than or equal to 5 microns. For example, the thickness H of the first electrode 31 covering the side of the first pixel definition portion 21 facing away from the substrate 10 may be 0.1 microns, 2 microns, 4 microns, 5 microns, etc.

[0051] Preferably, in one embodiment, the thickness H of the first electrode 31 covering the side of the first pixel definition portion 21 facing away from the substrate 10 is greater than 0 microns and less than or equal to 1 micron. For example, the thickness H of the first electrode 31 covering the side of the first pixel definition portion 21 facing away from the substrate 10 may be 0.01 microns, 0.5 microns, 0.7 microns, 1 micron, etc.

[0052] Optionally, in one embodiment, the display panel further includes a light-emitting device 30, which may be an Organic Light-Emitting Diode (OLED), a Micro Light-Emitting Diode (Micro LED), a Quantum Dot Light Emitting Diodes (QLED), etc. The light-emitting device 30 may be a light-emitting device of various colors, such as a red light-emitting device R, a green light-emitting device G, a blue light-emitting device B, etc.

[0053] Optionally, in one embodiment, the light-emitting device 30 includes a first electrode 31, a light-emitting functional layer 32 stacked on the first electrode 31, and a second electrode 33. The light-emitting functional layer 32 is located within the first pixel opening 22. The first electrode 31 may be an anode layer, and the second electrode 33 may be a cathode layer.

[0054] Figure 3a is Figure 1 a schematic structural diagram of the light-emitting device of the display panel shown, Figure 3b is Figure 1 another schematic structural diagram of the light-emitting device of the display panel shown. As Figure 3a and Figure 3b shown, in one embodiment, the light-emitting functional layer 32 includes a light-emitting layer 321, and the light-emitting layer 321 is located within the first pixel opening 22.

[0055] Optionally, in one embodiment, the light-emitting layer 321 includes a host material, a sensitizer, and a dye.

[0056] Optionally, in one embodiment, the dye is a boron-containing fluorescent dye or a boron-containing resonance-type thermally activated delayed fluorescence material.

[0057] Optionally, in one embodiment, the sensitizer includes a phosphorescent material.

[0058] Optionally, in one embodiment, the sensitizer includes a phosphorescent material containing a characteristic element, where the phosphorescent material is a material containing a metal element and capable of utilizing triplet excitons, and the characteristic elements include iridium, platinum, gold, silver, osmium, or copper.

[0059] Specifically, when the sensitizer of the present invention uses a phosphorescent material, the first excited singlet state energy level of the host material is greater than that of the phosphorescent sensitizer, and the first excited singlet state energy level of the phosphorescent sensitizer is greater than that of the dye; the first excited triplet state energy level of the host material is greater than that of the phosphorescent sensitizer, and the first excited triplet state energy level of the phosphorescent sensitizer is greater than that of the first excited singlet / triplet state of the dye. Due to the foregoing relationships between the first excited singlet state energy levels and the first excited triplet state energy levels of the host material, the phosphorescent sensitizer, and the dye respectively, after the organic electroluminescent device is electrically excited, the singlet excitons and triplet excitons of the host material will transition to the singlet excitons and triplet excitons of the phosphorescent sensitizer. Based on the property of intersystem crossing of the phosphorescent sensitizer, the singlet excitons in the phosphorescent sensitizer will intersystem cross to triplet excitons, and finally mainly pass through energy transfer to transfer energy to the dye, and then emit light.

[0060] Optionally, in one embodiment, the host material is selected from a thermally activated delayed fluorescence material, or a composition of a P-type material and an N-type material.

[0061] The resonance-type thermally activated delayed fluorescence material containing a boron element refers to a material containing a boron atom and having an energy level difference between the singlet state and the triplet state that satisfies the energy transfer from the sensitizer to the dye. The intramolecular charge transfer of this material is weak and the stability is high.

[0062] The hole mobility of the P-type material is greater than the electron mobility of the P-type material. The P-type material is a compound with hole transport properties containing at least one group among a carbazolyl group, an arylamino group, a silyl group, a fluorene group, a dibenzothiophene group, and a dibenzofuran group.

[0063] The electron mobility of the N-type material is greater than the hole mobility of the N-type material. The N-type material is a compound with electron transport properties containing at least one group among a pyridyl group, a pyrimidinyl group, a triazinyl group, an imidazolyl group, a phenanthroline group, a sulfonyl group, a heptazine group, an oxadiazolyl group, a cyano group, and a diphenylphosphinyl group.

[0064] Furthermore, the host material has good hole or electron transport capabilities to ensure efficient carrier migration and recombination to form excitons. The sensitizer can convert the triplet excitons of the sensitizer into singlet excitons through reverse intersystem crossing (RISC), thereby improving the exciton utilization rate. The dye is excited by receiving energy (such as singlet excitons) from the host material or the sensitizer, and then the luminous efficiency is improved by sensitizing the dye to emit light. Specifically, the difference between the HOMO energy level and the LUMO energy level of the host material is greater than the difference between the HOMO energy level and the LUMO energy level of the sensitizer, and the difference between the HOMO energy level and the LUMO energy level of the sensitizer is greater than the difference between the HOMO energy level and the LUMO energy level of the dye, so the exciton can complete energy transfer between the host material, the sensitizer, and between the sensitizer and the dye, and the dye finally transitions back to the ground state to release visible light with enhanced luminous efficiency.

[0065] Optionally, in one embodiment, the light emitting layer 321 includes a layer of light emitting layer 321 .

[0066] Optionally, in one embodiment, the light emitting layer 321 includes at least two light emitting layers 321. Specifically, the at least two light emitting layers 321 include a first sub-light emitting layer 3211 and a second sub-light emitting layer 3212, and the second sub-light emitting layer 3212 is located on a side of the first sub-light emitting layer 3211 away from the first electrode 31.

[0067] Furthermore, in one embodiment, the light-emitting functional layer 32 further includes at least one of a hole injection layer 322 , a hole transport layer 323 , and an electron blocking layer 324 located between the first electrode 31 and the light-emitting layer 321 .

[0068] Furthermore, in one embodiment, the light-emitting functional layer 32 further includes at least one of an electron injection layer 325 , an electron transport layer 326 , and a hole blocking layer 327 located between the second electrode 33 and the light-emitting layer 321 .

[0069] Furthermore, the light-emitting functional layer 32 further includes a charge generation layer 328 , and the charge generation layer 328 is located between the first sub-light-emitting layer 3211 and the second sub-light-emitting layer 3212 .

[0070] Furthermore, at least one of a hole blocking layer 327 and an electron transport layer 326 is included between the first sub-light emitting layer 3211 and the charge generation layer 328 .

[0071] Furthermore, at least one of a hole transport layer 323 and an electron blocking layer 324 is included between the charge generation layer 328 and the second sub-light emitting layer 3212 .

[0072] Please refer again Figure 1 and Figure 2, in one embodiment, the second pixel defining portion 41 encloses a second pixel opening 42, and the orthographic projection of the second pixel opening 42 on the substrate 10 is located within the orthographic projection of the first pixel opening 22 on the substrate.

[0073] Optionally, in one embodiment, the distance L between the edge of the orthographic projection of the second pixel opening 42 on the substrate 10 and the edge of the orthographic projection of the first pixel opening 22 on the substrate 10 is greater than 0 micrometers and less than or equal to 5 micrometers. For example, the distance L between the edge of the orthographic projection of the second pixel opening 42 on the substrate 10 and the edge of the orthographic projection of the first pixel opening 22 on the substrate 10 can be 0.1 micrometer, 1 micrometer, 3 micrometers, 4 micrometers, 5 micrometers, etc.

[0074] Optionally, in one embodiment, the distance L between the edge of the orthographic projection of the second pixel opening 42 on the substrate 10 and the edge of the orthographic projection of the first pixel opening 22 on the substrate 10 is greater than 0 micrometers and less than or equal to 1 micrometer. For example, the distance L between the edge of the orthographic projection of the second pixel opening 42 on the substrate 10 and the edge of the orthographic projection of the first pixel opening 22 on the substrate 10 can be 0.01 micrometer, 0.1 micrometer, 0.5 micrometer, 0.8 micrometer, 1 micrometer, etc.

[0075] Optionally, in one embodiment, the surface of the second pixel defining portion 41 covering the first electrode 31 on the side facing away from the substrate 10 includes an arc surface, so that the light of the light emitting device 30 can be better emitted, improving the light emitting efficiency of the display panel.

[0076] Optionally, in one embodiment, at least one second pixel defining portion 41 includes one second pixel defining portion 41, and one second pixel defining portion 41 encloses a plurality of second pixel openings 42.

[0077] Figure 4 is a schematic cross-sectional structure diagram of the display panel provided by the second embodiment of the present application. As Figure 4 shown, in one embodiment, at least one second pixel defining portion 41 includes at least two second pixel defining portions 41, and adjacent two second pixel defining portions 41 are arranged at intervals, and each second pixel defining portion 41 encloses a second pixel opening 42.

[0078] Figure 5 is a schematic cross-sectional structure diagram of the display panel provided by the third embodiment of the present application. As Figure 5 shown, in one embodiment, the display panel further includes an isolation structure 50. The isolation structure 50 is located on the side of the first pixel defining layer 20 facing away from the substrate 10 and between adjacent second pixel defining portions 41, and the isolation structure 50 can improve the light output crosstalk caused by optical waveguide.

[0079] Optionally, in one embodiment, the second electrode 33 is disconnected at the isolation structure 50.

[0080] Optionally, in one embodiment, the isolation structure 50 between adjacent light-emitting devices 30 is provided with at least one notch to connect the second electrodes 33 of adjacent light-emitting devices 30.

[0081] Figure 6a Yes Figure 5 is a schematic cross-sectional structure diagram of the isolation structure of the display panel shown. Figure 6b is a schematic cross-sectional structure diagram of the isolation structure of the display panel provided in the fourth embodiment of the present application. As Figure 6a and Figure 6b shown, in one embodiment, in the first direction X perpendicular to the display panel, the cross-sectional shape of the isolation structure 50 includes at least one of an inverted trapezoid and a parallelogram.

[0082] It should be understood that the cross-sectional structure of the isolation structure 50 in the embodiments of the present application is not limited. For example, the cross-sectional shape of the isolation structure 50 can be a triangle, an irregular shape, etc.

[0083] Optionally, in one embodiment, the material of the isolation structure 50 is the same as that of the second pixel defining layer 40.

[0084] Optionally, in one embodiment, the isolation structure 50 and the second pixel defining layer 40 are integrally formed, that is, when the structure of the second pixel defining layer 40 is formed, the structure of the isolation structure 50 is formed synchronously, simplifying the manufacturing process of the display panel.

[0085] Please refer to again Figure 5 , in one embodiment, the isolation structure 50 is connected to the second pixel defining portion 41.

[0086] Figure 7 is a schematic cross-sectional structure diagram of the display panel provided in the fifth embodiment of the present application. As Figure 7 shown, in one embodiment, the isolation structure 50 and the second pixel defining portion 41 are spaced apart to enable the light of the light-emitting device 30 to better exit, improving the light-emitting efficiency of the display panel.

[0087] Optionally, in one embodiment, at least one isolation structure 50 is provided between adjacent second pixel defining portions 41 in the first direction X perpendicular to the display panel.

[0088] Optionally, in one embodiment, one isolation structure 50 is provided between adjacent second pixel defining portions 41 in the first direction X perpendicular to the display panel.

[0089] Figure 8 is a schematic cross-sectional structure diagram of the display panel provided in the sixth embodiment of the present application. AsFigure 8 As shown, in one embodiment, in a first direction X perpendicular to the display panel, at least two isolation structures 50 are provided between adjacent second pixel defining portions 41, so that the second electrode 33 is more thoroughly disconnected.

[0090] Figure 9 It is a schematic cross-sectional structure diagram of a display panel provided by the seventh embodiment of the present application. As Figure 9 shown, in one embodiment, the display panel further includes a thin film encapsulation layer 60. The thin film encapsulation layer 60 is located on a side of the second electrode 33 away from the substrate 10. The thin film encapsulation layer 60 is used to encapsulate the light emitting device 30, which can achieve the purpose of isolating water and oxygen, reduce the probability of the light emitting device 30 and the underlying layer structure failing due to impurities such as water and oxygen entering the light emitting device 30, and ensure that the manufacturing process of the display panel does not affect the life and reliability of the OLED device.

[0091] Optionally, in one embodiment, the thin film encapsulation layer 60 includes a first encapsulation layer 61, a second encapsulation layer 62, and a third encapsulation layer 63 that are sequentially stacked on a side of the second electrode 33 away from the substrate 10.

[0092] Optionally, in one embodiment, the first encapsulation layer 61 and the third encapsulation layer 63 include an inorganic encapsulation layer. Exemplarily, the material of the inorganic encapsulation layer is silicon oxide, silicon oxynitride, silicon nitride, etc. The inorganic encapsulation layer can be a single layer, multiple layers, a composite layer, etc.

[0093] Optionally, in one embodiment, the second encapsulation layer 62 includes an organic encapsulation layer. Exemplarily, the material of the organic encapsulation layer is a fiber material, a resin material, a material for a laminated multilayer board, etc. The organic encapsulation layer can be a single layer, multiple layers, a composite layer, etc.

[0094] Figure 10 It is a schematic cross-sectional structure diagram of a display panel provided by the eighth embodiment of the present application. As Figure 10 shown, in one embodiment, the display panel further includes a refractive layer 70. The refractive layer 70 is located between the first encapsulation layer 61 and the second encapsulation layer 62, and the refractive layer 70 can better extract the light of the light emitting device 30.

[0095] Optionally, in one embodiment, the orthographic projection of the refractive layer 70 on the substrate 10 is located within the orthographic projection of the first pixel opening 22 on the substrate 10.

[0096] Optionally, in one embodiment, the refractive index of the refractive layer 70 is greater than or equal to 1.5 and less than or equal to 2. For example, the refractive index of the refractive layer 70 can be 1.5, 1.7, 1.8, 2, etc.

[0097] The embodiment of the present application provides a display panel, which includes a substrate, a first pixel definition layer, a first electrode layer and a second pixel definition layer. The first pixel definition layer is located on one side of the substrate, and the first pixel definition layer includes a first pixel definition part and a plurality of first pixel openings enclosed by the first pixel definition part; the angle between the side wall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees; the first electrode layer includes a plurality of first electrodes arranged at intervals, a portion of the first electrode is located in the first pixel opening, and the first electrode covers the side wall of the first pixel opening and extends to the side of the first pixel definition part away from the substrate; the second pixel definition layer includes at least one second pixel definition part, and the second pixel definition part at least covers the first electrode on the side wall of the first pixel opening and the first electrode on the side of the first pixel definition part away from the substrate. The above embodiment improves the reflection of the light of the light-emitting device of the display panel by covering the side wall of the first pixel opening with the first electrode and extending to the side of the first pixel definition part away from the substrate, thereby improving the light extraction efficiency of the display panel. Further, the angle between the side wall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees, so that the light of the light-emitting device is better reflected. Furthermore, the second pixel defining portion at least covers the first electrode on the sidewall of the first pixel opening and the first electrode on the side of the first pixel defining portion away from the substrate, so as to insulate the first electrode from the organic structure of the light-emitting device.

[0098] The present application also provides a method for preparing a display panel. Figure 11 FIG. 1 is a schematic diagram of a method for preparing a display panel provided in an embodiment of the present application. Figure 11 As shown, the preparation method comprises:

[0099] Step S100: preparing a planarization layer and a first pixel definition layer on a substrate.

[0100] The first pixel definition layer 20 includes a first pixel definition portion 21 and a plurality of first pixel openings 22 enclosed by the first pixel definition portion 21 , and an angle a between a sidewall of the first pixel opening 22 and the substrate 10 is greater than or equal to 40 degrees and less than or equal to 90 degrees.

[0101] Optionally, in one embodiment, preparing a planar layer 12 and a first pixel definition layer 20 on a substrate 11 includes: preparing a second organic material layer on the substrate 11, and patterning the second organic material layer to obtain a planar layer 12 and a first pixel definition layer 20, that is, the planar layer 12 and the first pixel definition layer 20 are prepared at the same time, thereby simplifying the preparation process of the display panel.

[0102] Optionally, in one embodiment, patterning the second organic material layer includes patterning the second organic material layer using a half-etching process.

[0103] Optionally, in one embodiment, preparing the planarization layer 12 and the first pixel definition layer 20 on the substrate 11 includes: preparing the planarization layer 12 on the substrate 11, and preparing the first pixel definition layer 20 on the side of the planarization layer 12 facing away from the substrate 11, that is, the planarization layer 12 and the first pixel definition layer 20 are prepared separately.

[0104] Step S200: Prepare a first electrode layer on the side of the first pixel definition layer facing away from the substrate.

[0105] Wherein, the first electrode layer includes a plurality of first electrodes 31 arranged at intervals, a part of the first electrode 31 is located within the first pixel opening 22, and the first electrode 31 covers the sidewall of the first pixel opening 22 and extends to the side of the first pixel definition portion 21 facing away from the substrate 11.

[0106] Step S300: Prepare a second pixel definition layer and an isolation structure on the side of the first electrode layer and the first pixel definition layer facing away from the substrate.

[0107] Wherein, the second pixel definition layer 40 includes at least two second pixel definition portions 41, the second pixel definition portion 41 at least covers the first electrode 31 on the sidewall of the first pixel opening 22 and the first electrode 31 on the side of the first pixel definition portion 21 facing away from the substrate 10, adjacent two second pixel definition portions 41 are arranged at intervals, and the isolation structure 50 is located on the side of the first pixel definition layer 20 facing away from the substrate 11 and between adjacent second pixel definition portions 41.

[0108] Optionally, in one embodiment, preparing the second pixel definition layer 40 and the isolation structure 50 on the side of the first electrode layer and the first pixel definition layer 20 facing away from the substrate 11 includes: preparing a first organic material layer on the side of the first electrode layer and the first pixel definition layer 20 facing away from the substrate 11, and patterning the first organic material layer to obtain the second pixel definition layer 40 and the isolation structure 50, that is, the second pixel definition layer 40 and the isolation structure 50 are prepared simultaneously, which simplifies the manufacturing process of the display panel.

[0109] Optionally, in one embodiment, patterning the first organic material layer includes patterning the first organic material layer by using a semi-etch process.

[0110] Optionally, in one embodiment, preparing the second pixel definition layer 40 and the isolation structure 50 on the side of the first electrode layer and the first pixel definition layer 20 facing away from the substrate 11 includes: preparing the second pixel definition layer 40 on the side of the first electrode layer and the first pixel definition layer 20 facing away from the substrate 11, and preparing the isolation structure 50 on the side of the second pixel definition layer 40 facing away from the substrate 11, that is, the second pixel definition layer 40 and the isolation structure 50 are prepared separately.

[0111] An embodiment of the present application further provides a display device, which includes the display panel provided in the above embodiment. The display device is a product with an image display function. For example, the display device can be used to display static images, such as pictures or photos. The display device can also be used to display dynamic images, such as videos.

[0112] In addition, the display device can also have functions such as taking pictures, recording videos, fingerprint recognition, face recognition, etc. Correspondingly, the display device further includes at least one functional module for implementing the above functions, such as an under-screen camera, an under-screen fingerprint recognition sensor, etc.

[0113] The display device provided according to any embodiment of the present application and the display panel provided in the embodiment of the present application belong to the same inventive concept and have corresponding film layer structures and beneficial effects. Details not described in detail in the embodiments of the display device can be found in the embodiment part of the display panel and will not be repeated here.

[0114] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present application. In addition, the above-disclosed specific details are only for the purpose of illustration and facilitating understanding, rather than limitations. The above details do not limit the present application to necessarily adopt the above specific details to implement.

[0115] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present application are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with each other. The word "or" and "and" used here refer to the word "and / or" and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to" and can be used interchangeably with each other.

[0116] It should also be noted that in the devices, equipment, and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present application.

[0117] The foregoing description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Thus, this application is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0118] The foregoing description has been presented for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although several example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions, and subcombinations.

[0119] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, subcombinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0120] The basic principles of this application have been described above in connection with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in this application are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of this application. In addition, the above-disclosed specific details are only for illustrative and facilitating understanding purposes and are not limitations. The above details do not limit this application to necessarily adopting the above specific details for implementation.

[0121] The foregoing description has been presented for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although several example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions, and subcombinations.

Claims

1. A display panel, characterized in that: include: substrate; A first pixel definition layer, located on one side of the substrate, the first pixel definition layer comprising a first pixel definition portion and a plurality of first pixel openings enclosed by the first pixel definition portion; An angle between the sidewall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees; A first electrode layer, comprising a plurality of first electrodes arranged at intervals, wherein the first electrodes are partially located in the first pixel opening, and the first electrodes cover the sidewalls of the first pixel opening and extend to a side of the first pixel definition portion away from the substrate; The second pixel definition layer includes at least one second pixel definition portion, and the second pixel definition portion at least covers the first electrode on the side wall of the first pixel opening and the first electrode on the side of the first pixel definition portion away from the substrate.

2. The display panel according to claim 1, characterized in that: The second pixel definition portion encloses a second pixel opening, and the orthographic projection of the second pixel opening on the substrate is located within the orthographic projection of the first pixel opening on the substrate; Preferably, a distance between an edge of an orthographic projection of the second pixel opening on the substrate and an edge of an orthographic projection of the first pixel opening on the substrate is greater than 0 micrometers and less than or equal to 5 micrometers; Preferably, a distance between an edge of an orthographic projection of the second pixel opening on the substrate and an edge of an orthographic projection of the first pixel opening on the substrate is greater than 0 micrometer and less than or equal to 1 micrometer; Preferably, the thickness of the first electrode covering the side of the first pixel definition portion away from the substrate is greater than 0 micrometers and less than or equal to 5 micrometers; Preferably, a thickness of the first electrode covering a side of the first pixel defining portion facing away from the substrate is greater than 0 micrometer and less than or equal to 1 micrometer.

3. The display panel according to claim 2, characterized in that: A surface of the second pixel definition portion covering the first electrode and facing away from the substrate includes an arc surface; Preferably, the substrate comprises a substrate and a planar layer, and the planar layer is located between the substrate and the first pixel definition layer; Preferably, the material of the planar layer is the same as that of the first pixel definition layer; Preferably, the planarization layer and the first pixel definition layer are integrally formed.

4. The display panel according to claim 1, characterized in that: At least one of the second pixel definition parts includes at least two second pixel definition parts, and two adjacent second pixel definition parts are arranged at intervals; Preferably, it further comprises an isolation structure, wherein the isolation structure is located on a side of the first pixel definition layer away from the substrate and between adjacent second pixel definition portions; Preferably, the isolation structure and the second pixel definition portion are connected; or, the isolation structure and the second pixel definition portion are spaced apart; Preferably, in a first direction perpendicular to the display panel, at least one isolation structure is provided between adjacent second pixel definition portions; Preferably, in the first direction perpendicular to the display panel, the cross-sectional shape of the isolation structure includes at least one of an inverted trapezoid and a parallelogram; Preferably, the material of the isolation structure is the same as the material of the second pixel definition layer; Preferably, the isolation structure and the second pixel definition layer are integrally formed.

5. The display panel according to claim 4, characterized in that: Also includes a light-emitting functional layer and a second electrode stacked on the first electrode; Preferably, the light-emitting functional layer includes a light-emitting layer, and the light-emitting layer is located in the first pixel opening; Preferably, the light-emitting functional layer further comprises at least one of a hole injection layer, a hole transport layer, and an electron blocking layer located between the first electrode and the light-emitting layer; Preferably, the light-emitting functional layer further comprises at least one of an electron injection layer, an electron transport layer, and a hole blocking layer located between the second electrode and the light-emitting layer; Preferably, the light-emitting layer includes one light-emitting layer; or the light-emitting layer includes at least two light-emitting layers; Preferably, the at least two light-emitting layers include a first sub-light-emitting layer and a second sub-light-emitting layer, and the second sub-light-emitting layer is located on a side of the first sub-light-emitting layer away from the first electrode; Preferably, the light-emitting functional layer further comprises a charge generation layer, and the charge generation layer is located between the first sub-light-emitting layer and the second sub-light-emitting layer; Preferably, at least one of the hole blocking layer and the electron transport layer is further included between the first sub-light emitting layer and the charge generating layer; Preferably, at least one of the hole transport layer and the electron blocking layer is further included between the charge generation layer and the second sub-light emitting layer; Preferably, the second electrode is disconnected at the isolation structure.

6. The display panel according to claim 5, characterized in that: The light-emitting functional layer includes a light-emitting layer, and the light-emitting layer is located in the first pixel opening; Preferably, the light-emitting layer comprises a host material, a sensitizer and a dye; Preferably, the dye is a boron-containing fluorescent dye or a resonant thermally activated delayed fluorescent material containing boron; Preferably, the sensitizer comprises a phosphorescent material; Preferably, the sensitizer comprises a phosphorescent material containing a characteristic element, and the characteristic element comprises iridium, platinum, gold, silver, osmium or copper; Preferably, the host material is selected from a thermally activated delayed fluorescent material, or a combination of a P-type material and an N-type material.

7. The display panel according to claim 5, characterized in that: It also includes a thin film encapsulation layer, which is located on a side of the second electrode away from the substrate; Preferably, the thin film encapsulation layer comprises a first encapsulation layer, a second encapsulation layer and a third encapsulation layer sequentially stacked on a side of the second electrode away from the substrate; Preferably, the first encapsulation layer and the second encapsulation layer include inorganic encapsulation layers; Preferably, the second encapsulation layer comprises an organic encapsulation layer.

8. The display panel according to claim 7, characterized in that: Also comprising a refractive layer, wherein the refractive layer is located between the first encapsulation layer and the second encapsulation layer; Preferably, the orthographic projection of the refractive layer on the substrate is located within the orthographic projection of the first pixel opening on the substrate; Preferably, the refractive index of the refractive layer is greater than or equal to 1.5 and less than or equal to 2.

9. A method for preparing a display panel, characterized in that: include: A planar layer and a first pixel definition layer are prepared on a substrate, wherein the first pixel definition layer includes a first pixel definition portion and a plurality of first pixel openings enclosed by the first pixel definition portion; An angle between the sidewall of the first pixel opening and the substrate is greater than or equal to 40 degrees and less than or equal to 90 degrees; A first electrode layer is prepared on a side of the first pixel definition layer away from the substrate, wherein the first electrode layer includes a plurality of first electrodes arranged at intervals, wherein the first electrodes are partially located in the first pixel opening, and the first electrodes cover the sidewalls of the first pixel opening and extend to the side of the first pixel definition layer away from the substrate; A second pixel definition layer and an isolation structure are prepared on the side of the first electrode layer and the first pixel definition layer facing away from the substrate, the second pixel definition layer includes at least two second pixel definition parts, the second pixel definition part at least covers the first electrode on the side wall of the first pixel opening and the first electrode on the side of the first pixel definition part facing away from the substrate; two adjacent second pixel definition parts are arranged at intervals, and the isolation structure is located on the side of the first pixel definition layer facing away from the substrate and between adjacent second pixel definition parts.

10. The preparation method according to claim 9, characterized in that: The step of preparing a second pixel definition layer and an isolation structure on a side of the first electrode layer and the first pixel definition layer facing away from the substrate comprises: Preparing a first organic material layer on the side of the first electrode layer and the first pixel definition layer away from the substrate, and patterning the first organic material layer to obtain the second pixel definition layer and the isolation structure; Preferably, patterning the first organic material layer comprises: patterning the first organic material layer by using a half-etching process; Preferably, the step of preparing a planar layer and a first pixel definition layer on a substrate comprises: A second organic material layer is prepared on the substrate, and the second organic material layer is patterned to obtain the planarization layer and the first pixel definition layer.

11. A display device, characterized in that: The invention comprises a display panel as described in any one of claims 1 to 8, or a display panel obtained by the preparation method as described in claim 9 or 10.

Images