Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel and a preparation method thereof and a display device, and relates to the technical field of display, the display panel comprises a substrate and a plurality of light-emitting units, the light-emitting units are arranged on one side of the substrate, and the light-emitting units comprise first light-emitting units and second light-emitting units; the first light emitting layer includes a first end portion and a second end portion opposite to the first end portion in the first direction, and the second light emitting layer includes a third end portion and a fourth end portion opposite to the third end portion in the first direction. A first difference value exists between the thickness of the first upper electrode located above the first end portion and the thickness of the first upper electrode located above the second end portion, and a second difference value exists between the thickness of the second upper electrode located above the third end portion and the thickness of the second upper electrode located above the fourth end portion. The absolute value of the first difference is not smaller than that of the second difference, and the first difference is not equal to 0. According to the display panel provided by the invention, the use performance / process performance of the display device can be improved.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and more specifically, relates to a display panel and a preparation method thereof, and a display device. Background Art

[0002] Some display panels have the advantages of low power consumption, high brightness, wide viewing angle, high contrast and flexible display. They are widely used in electronic products such as mobile phones, TVs, tablets, laptops, desktop computers, vehicle-mounted display terminals, wearable devices, human-computer interaction terminal equipment, etc.

[0003] However, the performance and process performance of the display device need to be further improved. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a display panel and a method for manufacturing the same, and a display device, so as to improve the performance / process performance of the display device.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In a first aspect, a display panel is provided, comprising a substrate and a plurality of light-emitting units, wherein the light-emitting units are arranged on one side of the substrate, wherein the light-emitting units include a first light-emitting unit and a second light-emitting unit, wherein the first light-emitting unit includes a first light-emitting layer and a first upper electrode which are sequentially stacked in a direction away from the substrate, wherein the first light-emitting layer includes a first end and a second end opposite to the first end in the first direction, wherein the second light-emitting unit includes a second light-emitting layer and a second upper electrode which are sequentially stacked in a direction away from the substrate, wherein the second light-emitting layer includes a third end and a fourth end opposite to the third end in the first direction. Wherein, the thickness of the first upper electrode located above the first end has a first difference with the thickness of the first upper electrode located above the second end, the thickness of the second upper electrode located above the third end has a second difference with the thickness of the second upper electrode located above the fourth end, the absolute value of the first difference is not less than the absolute value of the second difference, and the first difference is not equal to 0. Through the above technical solution, the thickness of the first upper electrode of the first light-emitting unit relative to the two ends in the first direction may be inconsistent, that is, the thickness of the first upper electrode of the first light-emitting unit at one end in the first direction may be greater than 0 but less than the thickness of the other end. The end portion of the first upper electrode in the first direction can protect the underlying film layer to a certain extent, which is beneficial to improving reliability.

[0007] Therefore, the display panel provided by the present application can improve the use performance / process performance of the display device. In some embodiments, the display panel provided by the present application also includes a pixel definition layer and an isolation structure, the pixel definition layer is arranged on one side of the substrate, including a first pixel opening and a second pixel opening, the isolation structure is arranged on the side of the pixel definition layer away from the substrate, the isolation structure includes a first isolation opening and a second isolation opening, the first isolation opening is connected to the first pixel opening, the second isolation opening is connected to the second pixel opening, part of the first light-emitting unit is arranged in the first isolation opening, and part of the second light-emitting unit is arranged in the second isolation opening; wherein, the pixel definition layer located on the peripheral side of the first light-emitting unit has a first minimum thickness, the pixel definition layer located on the peripheral side of the second light-emitting unit has a second minimum thickness, and the first minimum thickness is not greater than the second minimum thickness.

[0008] In some embodiments, the plurality of light-emitting units further include a third light-emitting unit, the pixel definition layer further includes a third pixel opening, the isolation structure further includes a third isolation opening, the third isolation opening is connected to the third pixel opening, and a portion of the third light-emitting unit is disposed in the third isolation opening, wherein:

[0009] The pixel definition layer located at the peripheral side of the third light emitting unit has a third minimum thickness, and the first minimum thickness is not greater than the third minimum thickness.

[0010] In some embodiments, the first minimum thickness, the second minimum thickness, and the third minimum thickness are equal.

[0011] Optionally, the absolute value of the first difference is greater than the absolute value of the second difference.

[0012] Optionally, the third light-emitting unit includes a third light-emitting layer and a third upper electrode stacked in sequence along a direction away from the substrate, the third light-emitting layer includes a fifth end and a sixth end opposite to the fifth end in the first direction, and the thickness of the third upper electrode located above the fifth end and the thickness of the third upper electrode located above the sixth end have a third difference, wherein the absolute value of the first difference is greater than the absolute value of the third difference.

[0013] Optionally, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure.

[0014] Optionally, the second upper electrode located above the third end and the second upper electrode located above the fourth end are both overlapped with the isolation structure.

[0015] Optionally, the third upper electrode located above the fifth end and the third upper electrode located above the sixth end are both overlapped with the isolation structure.

[0016] Optionally, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is one of blue and green, and the light emitting color of the third light emitting unit is the other of blue and green.

[0017] In some embodiments, the first minimum thickness is less than the third minimum thickness, and the second minimum thickness is less than the third minimum thickness.

[0018] Optionally, the absolute value of the first difference is greater than the absolute value of the second difference.

[0019] Optionally, the third light-emitting unit includes a third light-emitting layer and a third upper electrode stacked in sequence along a direction away from the substrate, the third light-emitting layer includes a fifth end and a sixth end opposite to the fifth end in the first direction, and the thickness of the third upper electrode located above the fifth end and the thickness of the third upper electrode located above the sixth end have a third difference, wherein the absolute value of the third difference is greater than the absolute value of the second difference.

[0020] Optionally, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure.

[0021] Optionally, the second upper electrode located above the third end and the second upper electrode located above the fourth end are both overlapped with the isolation structure.

[0022] Optionally, the thickness of the third upper electrode located above the fifth end is greater than the thickness of the third upper electrode located above the sixth end, wherein the third upper electrode located above the fifth end overlaps the isolation structure, and the third upper electrode located above the sixth end is spaced apart from the isolation structure.

[0023] Optionally, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is green, and the light emitting color of the third light emitting unit is blue.

[0024] In some embodiments, the first minimum thickness is less than the second minimum thickness, and the first minimum thickness is less than the third minimum thickness.

[0025] Optionally, the third light-emitting unit includes a third light-emitting layer and a third upper electrode which are stacked in sequence along a direction away from the substrate, the third light-emitting layer includes a fifth end and a sixth end opposite to the fifth end in the first direction, and the thickness of the third upper electrode located above the fifth end and the thickness of the third upper electrode located above the sixth end have a third difference, wherein the absolute value of the third difference is smaller than the absolute value of the first difference, and the absolute value of the third difference is smaller than the absolute value of the second difference.

[0026] Optionally, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure.

[0027] Optionally, the thickness of the second upper electrode located above the third end is greater than the thickness of the second upper electrode located above the fourth end, wherein the second upper electrode located above the third end overlaps the isolation structure, and the second upper electrode located above the fourth end is spaced apart from the isolation structure.

[0028] Optionally, the third upper electrode located above the fifth end and the third upper electrode located above the sixth end are both overlapped with the isolation structure.

[0029] Optionally, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is green, and the light emitting color of the third light emitting unit is blue.

[0030] In some embodiments, the orthographic projection of the first light-emitting layer on the substrate is located outside the orthographic projection of the first upper electrode on the substrate, the orthographic projection of the second light-emitting layer on the substrate is located within the orthographic projection of the second upper electrode on the substrate, and the orthographic projection of the third light-emitting layer on the substrate is located within the orthographic projection of the third upper electrode on the substrate.

[0031] In some embodiments, a portion of the orthographic projection of the first light-emitting layer on the substrate is located outside the orthographic projection of the first upper electrode on the substrate, an orthographic projection of the second light-emitting layer on the substrate is located within the orthographic projection of the second upper electrode on the substrate, and a portion of the orthographic projection of the third light-emitting layer on the substrate is located outside the orthographic projection of the third upper electrode on the substrate.

[0032] In some embodiments, a portion of the orthographic projection of the first light-emitting layer on the substrate is located outside the orthographic projection of the first upper electrode on the substrate, a portion of the orthographic projection of the second light-emitting layer on the substrate is located outside the orthographic projection of the second upper electrode on the substrate, and an orthographic projection of the third light-emitting layer on the substrate is located within the orthographic projection of the third upper electrode on the substrate.

[0033] In some embodiments, the isolation structure includes a first layer, a second layer, and a third layer stacked in sequence in a direction away from the substrate, the orthographic projection of the second layer on the substrate is located within the orthographic projection of the first layer on the substrate, and the orthographic projection of the surface of the second layer close to the third layer on the substrate is located within the orthographic projection of the third layer on the substrate.

[0034] Optionally, the orthographic projection area of ​​the second layer on the substrate is smaller than the orthographic projection area of ​​the first layer on the substrate, and the orthographic projection area of ​​the surface of the second layer close to the third layer on the substrate is smaller than the orthographic projection area of ​​the third layer on the substrate.

[0035] In some embodiments, the first light-emitting unit also includes a first lower electrode located on the side of the first light-emitting layer facing the substrate, a portion of the first lower electrode is located between the substrate and the pixel definition layer, and another portion is exposed from the first pixel opening; the second light-emitting unit also includes a second lower electrode located on the side of the second light-emitting layer facing the substrate, a portion of the second lower electrode is located between the substrate and the pixel definition layer, and another portion is exposed from the second pixel opening; the third light-emitting unit includes a third light-emitting layer and a third upper electrode stacked in sequence in a direction away from the substrate, and the third light-emitting unit also includes a third lower electrode located on the side of the third light-emitting layer facing the substrate, a portion of the third lower electrode is located between the substrate and the pixel definition layer, and another portion is exposed from the third pixel opening.

[0036] In a second aspect, the present application provides another display panel, which includes a substrate, an isolation structure and a plurality of light-emitting units, wherein the isolation structure is arranged on one side of the substrate and includes a first isolation opening and a second isolation opening, the light-emitting units include a first light-emitting unit and a second light-emitting unit, a portion of the first light-emitting unit is arranged in the first isolation opening, the first light-emitting unit includes a first light-emitting layer and a first upper electrode which are sequentially stacked in a direction away from the substrate, the first light-emitting layer includes a first end and a second end opposite to the first end in the first direction, a portion of the second light-emitting unit is arranged in the second isolation opening, the second light-emitting unit includes a second light-emitting layer and a second upper electrode which are sequentially stacked in a direction away from the substrate, the second light-emitting layer includes a third end and a fourth end opposite to the third end in the first direction.

[0037] Among them, the thickness of the first upper electrode located above the first end and the thickness of the first upper electrode located above the second end have a first difference, the thickness of the second upper electrode located above the third end and the thickness of the second upper electrode located above the fourth end have a second difference, and the absolute value of the first difference is not less than the absolute value of the second difference.

[0038] Through the above technical solution, the thickness of the first upper electrode of the first light-emitting unit at the two ends relative to each other in the first direction may be inconsistent. That is, the thickness of one end of the first upper electrode of the first light-emitting unit in the first direction may be greater than 0 but less than the thickness of the other end. The end of the first upper electrode in the first direction can protect the film layer below to a certain extent, which is conducive to improving reliability. In addition, the other end of the first upper electrode of the first light-emitting unit in the first direction has a better overlap effect with the isolation structure.

[0039] Therefore, the display panel provided in the present application can improve the performance / process performance of the display device.

[0040] In some embodiments, the display panel provided in the present application further includes a pixel definition layer, the pixel definition layer is disposed on one side of the substrate, the pixel definition layer includes a first pixel opening and a second pixel opening, the isolation structure is disposed on a side of the pixel definition layer away from the substrate, the first isolation opening is connected to the first pixel opening, and the second isolation opening is connected to the second pixel opening;

[0041] The pixel definition layer located around the first light-emitting unit has a first minimum thickness, the pixel definition layer located around the second light-emitting unit has a second minimum thickness, and the first minimum thickness is not greater than the second minimum thickness.

[0042] In a third aspect, the present application further provides a method for preparing a display panel, the method comprising:

[0043] providing a substrate;

[0044] A light-emitting unit is prepared on one side of the substrate, wherein the light-emitting unit is a plurality of light-emitting units, and the light-emitting unit includes a first light-emitting unit and a second light-emitting unit, wherein the first light-emitting unit includes a first light-emitting layer and a first upper electrode sequentially stacked in a direction away from the substrate, wherein the first light-emitting layer includes a first end and a second end opposite to the first end in the first direction, wherein the second light-emitting unit includes a second light-emitting layer and a second upper electrode sequentially stacked in a direction away from the substrate, wherein the second light-emitting layer includes a third end and a fourth end opposite to the third end in the first direction;

[0045] Among them, the thickness of the first upper electrode located above the first end and the thickness of the first upper electrode located above the second end have a first difference, the thickness of the second upper electrode located above the third end and the thickness of the second upper electrode located above the fourth end have a second difference, the absolute value of the first difference is not less than the absolute value of the second difference, and the first difference is not equal to 0.

[0046] In some embodiments, before preparing the light-emitting unit on one side of the substrate, the preparation method provided by the present application further includes:

[0047] preparing a pixel definition layer on one side of the substrate;

[0048] Prepare an isolation structure on a side of the pixel definition layer facing away from the substrate;

[0049] The patterned isolation structure forms a first isolation opening, a second isolation opening, and a third isolation opening;

[0050] The pixel definition layer is patterned to form a first pixel opening, a second pixel opening and a third pixel opening, wherein the first pixel opening is connected to the first isolation opening, the second pixel opening is connected to the second isolation opening, and the third pixel opening is connected to the third isolation opening;

[0051] The pixel definition layer located around the first light-emitting unit has a first minimum thickness, the pixel definition layer located around the second light-emitting unit has a second minimum thickness, and the first minimum thickness is not greater than the second minimum thickness.

[0052] In some embodiments, the light-emitting unit further includes a third light-emitting unit, and preparing the light-emitting unit on one side of the substrate includes:

[0053] preparing a third light-emitting unit, wherein a portion of the third light-emitting unit is disposed in the third isolation opening;

[0054] preparing a second light-emitting unit, wherein a portion of the second light-emitting unit is disposed in the second isolation opening;

[0055] preparing a first light-emitting unit, wherein a portion of the first light-emitting unit is disposed in the first isolation opening;

[0056] The pixel definition layer located at the peripheral side of the third light emitting unit has a third minimum thickness, and the first minimum thickness is not greater than the third minimum thickness.

[0057] In some embodiments, the light-emitting unit further includes a third light-emitting unit, and preparing the light-emitting unit on one side of the substrate includes:

[0058] preparing a third light-emitting unit, wherein a portion of the third light-emitting unit is disposed in the third isolation opening;

[0059] preparing a second light-emitting unit, wherein a portion of the second light-emitting unit is disposed in the second isolation opening;

[0060] preparing a first light-emitting unit, wherein a portion of the first light-emitting unit is disposed in the first isolation opening;

[0061] The pixel definition layer located at the peripheral side of the third light emitting unit has a third minimum thickness, and the first minimum thickness, the second minimum thickness and the third minimum thickness are equal.

[0062] Optionally, the absolute value of the first difference is greater than the absolute value of the second difference.

[0063] Optionally, the third light-emitting unit includes a third light-emitting layer and a third upper electrode stacked in sequence along a direction away from the substrate, the third light-emitting layer includes a fifth end and a sixth end opposite to the fifth end in the first direction, and the thickness of the third upper electrode located above the fifth end and the thickness of the third upper electrode located above the sixth end have a third difference, wherein the absolute value of the first difference is greater than the absolute value of the third difference.

[0064] Optionally, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure.

[0065] Optionally, the second upper electrode located above the third end and the second upper electrode located above the fourth end are both overlapped with the isolation structure.

[0066] Optionally, the third upper electrode located above the fifth end and the third upper electrode located above the sixth end are both overlapped with the isolation structure.

[0067] Optionally, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is one of blue and green, and the light emitting color of the third light emitting unit is the other of blue and green.

[0068] In some embodiments, the light-emitting unit further includes a third light-emitting unit, and preparing the light-emitting unit on one side of the substrate includes:

[0069] preparing a third light-emitting unit, wherein a portion of the third light-emitting unit is disposed in the third isolation opening;

[0070] preparing a second light-emitting unit, wherein a portion of the second light-emitting unit is disposed in the second isolation opening;

[0071] preparing a first light-emitting unit, wherein a portion of the first light-emitting unit is disposed in the first isolation opening;

[0072] The pixel definition layer located at the peripheral side of the third light-emitting unit has a third minimum thickness, the first minimum thickness is smaller than the third minimum thickness, and the second minimum thickness is smaller than the third minimum thickness.

[0073] Optionally, the absolute value of the first difference is greater than the absolute value of the second difference.

[0074] Optionally, the third light-emitting unit includes a third light-emitting layer and a third upper electrode stacked in sequence along a direction away from the substrate, the third light-emitting layer includes a fifth end and a sixth end opposite to the fifth end in the first direction, and the thickness of the third upper electrode located above the fifth end and the thickness of the third upper electrode located above the sixth end have a third difference, wherein the absolute value of the third difference is greater than the absolute value of the second difference.

[0075] Optionally, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure.

[0076] Optionally, the second upper electrode located above the third end and the second upper electrode located above the fourth end are both overlapped with the isolation structure.

[0077] Optionally, the thickness of the third upper electrode located above the fifth end is greater than the thickness of the third upper electrode located above the sixth end, wherein the third upper electrode located above the fifth end overlaps the isolation structure, and the third upper electrode located above the sixth end is spaced apart from the isolation structure.

[0078] Optionally, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is green, and the light emitting color of the third light emitting unit is blue.

[0079] In some embodiments, the light-emitting unit further includes a third light-emitting unit, and preparing the light-emitting unit on one side of the substrate includes:

[0080] preparing a third light-emitting unit, wherein a portion of the third light-emitting unit is disposed in the third isolation opening;

[0081] preparing a second light-emitting unit, wherein a portion of the second light-emitting unit is disposed in the second isolation opening;

[0082] preparing a first light-emitting unit, wherein a portion of the first light-emitting unit is disposed in the first isolation opening;

[0083] The pixel definition layer located at the peripheral side of the third light-emitting unit has a third minimum thickness, the first minimum thickness is less than the second minimum thickness, and the first minimum thickness is less than the third minimum thickness.

[0084] Optionally, the third light-emitting unit includes a third light-emitting layer and a third upper electrode which are stacked in sequence along a direction away from the substrate, the third light-emitting layer includes a fifth end and a sixth end opposite to the fifth end in the first direction, and the thickness of the third upper electrode located above the fifth end and the thickness of the third upper electrode located above the sixth end have a third difference, wherein the absolute value of the third difference is smaller than the absolute value of the first difference, and the absolute value of the third difference is smaller than the absolute value of the second difference.

[0085] Optionally, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure.

[0086] Optionally, the thickness of the second upper electrode located above the third end is greater than the thickness of the second upper electrode located above the fourth end, wherein the second upper electrode located above the third end overlaps the isolation structure, and the second upper electrode located above the fourth end is spaced apart from the isolation structure.

[0087] Optionally, the third upper electrode located above the fifth end and the third upper electrode located above the sixth end are both overlapped with the isolation structure.

[0088] Optionally, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is green, and the light emitting color of the third light emitting unit is blue.

[0089] In a fourth aspect, the present application provides a display device, comprising a display panel according to any of the above embodiments. The display device provided by the present application has the same or similar technical effects as the display panel according to any of the above embodiments, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0091] Figure 1 A schematic diagram of the planar structure of a display panel provided in an embodiment of the present application;

[0092] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0093] Figure 3 for Figure 2 One of the cross-sectional views along line BB;

[0094] Figure 4 One of the structural schematic diagrams of the display panel processing process provided in the embodiment of the present application;

[0095] Figure 5 The second structural schematic diagram of the display panel during processing provided by the embodiment of the present application;

[0096] Figure 6 The third structural diagram of the display panel processing process provided by the embodiment of the present application;

[0097] Figure 7 The fourth structural diagram of the display panel during processing provided by the embodiment of the present application;

[0098] Figure 8 The fifth structural diagram of the display panel processing process provided by the embodiment of the present application;

[0099] Fig. 9 The sixth structural diagram of the display panel processing process provided by the embodiment of the present application;

[0100] Fig.10 The seventh structural diagram of the display panel processing process provided by the embodiment of the present application;

[0101] Fig.11 The eighth structural diagram of the display panel processing process provided by the embodiment of the present application;

[0102] Fig.12 The ninth structural diagram of the display panel processing process provided by the embodiment of the present application;

[0103] Fig.13 for Figure 2 One of the cross-sectional views along line BB;

[0104] Fig.14 for Figure 2 One of the cross-sectional views along line BB;

[0105] Fig.15 for Figure 2 One of the cross-sectional views along line BB;

[0106] Fig.16 for Figure 2 One of the cross-sectional views along line BB;

[0107] Fig.17 One of the flow diagrams of the preparation method provided in the embodiment of the present application;

[0108] Fig.18 The second schematic diagram of the preparation method provided in the embodiment of the present application;

[0109] Fig.19 The third flow chart of the preparation method provided in the embodiment of the present application.

[0110] Among them, the reference numerals in the figure are:

[0111] 100-display panel; 200-evaporation device; 10-substrate; 20-pixel definition layer; 21-hole; 30-isolation structure; 301-first isolation opening; 302-second isolation opening; 303-third isolation opening; 31-first layer; 32-second layer; 33-third layer; 40-first light-emitting unit; 41-first light-emitting layer; 411-first end; 412-second end; 42-first upper electrode; 43-first lower electrode; 50-first Two light-emitting units; 51-second light-emitting layer; 511-third end; 512-fourth end; 52-second upper electrode; 53-second lower electrode; 60-third light-emitting unit; 61-third light-emitting layer; 611-fifth end; 612-sixth end; 62-third upper electrode; 63-third lower electrode; 70-first encapsulation layer; 71-first encapsulation part; 72-second encapsulation part; 73-third encapsulation part; 80-second encapsulation layer; 90-third encapsulation layer. DETAILED DESCRIPTION

[0112] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0113] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0114] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0115] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0116] Please also read Figure 1 , Figure 2 and Figure 3 A display panel provided in an embodiment of the present application includes a substrate 10, a pixel definition layer 20 (Pixel Defined Layer, PDL) and a lower electrode layer arranged on one side of the substrate 10 in the thickness direction, the lower electrode layer includes a plurality of lower electrodes arranged at intervals, the pixel definition layer 20 is provided with a pixel opening corresponding to the lower electrode, the pixel opening exposes a portion of the lower electrode, and the orthographic projection of the pixel opening on the substrate 10 is located within the orthographic projection of the lower electrode on the substrate 10. The display panel also includes an isolation structure 30 and a display function layer arranged on the pixel definition layer 20, the isolation structure 30 defines at least one isolation opening, the display function layer includes a plurality of light-emitting units, parts of the light-emitting units are located in the corresponding isolation openings, that is, parts of the orthographic projections of the light-emitting units on the substrate 10 are located within the orthographic projections of the corresponding isolation openings on the substrate 10, the orthographic projections of the light-emitting units on the substrate 10 are located within the orthographic projections of the corresponding isolation openings on the substrate 10, and the light-emitting units include a lower electrode, a light-emitting layer and an upper electrode which are sequentially stacked in a direction away from the substrate 10.

[0117] The composition, preparation, etc. of the isolation structure 30 are described in patents CN118251982A, 202410864269.8, PCT / CN2024 / 098407, PCT / CN2024 / 102783, PCT / CN2024 / 098217, PCT / CN2024 / 099419, PCT / CN2024 / 099072, CN 117979755A, CN117998900A, CN117062489A, CN117580403A, CN116583155A, CN116669477A, ​​CN117396039A, CN116669480A, CN116600606A, and CN117500332A for reference.

[0118] The display panel also includes a driving circuit (not shown) disposed on the substrate 10. The driving circuit can be electrically connected to the lower electrode (eg, anode) and the upper electrode (eg, cathode) of the light-emitting unit to enable the light-emitting layer to emit light.

[0119] Exemplarily, there are multiple light-emitting units, and the multiple light-emitting units include a first light-emitting unit 40, a second light-emitting unit 50, and a third light-emitting unit 60. That is, some of the light-emitting units in the multiple light-emitting units are the first light-emitting units 40, and some of the light-emitting units are the second light-emitting units 50, and the remaining light-emitting units are the third light-emitting units 60. Among them, the first light-emitting unit 40 includes a first lower electrode 43, a first light-emitting layer 41, and a first upper electrode 42 stacked in sequence in a direction away from the substrate 10, the second light-emitting unit 50 includes a second lower electrode 53, a second light-emitting layer 51, and a second upper electrode 52 stacked in sequence in a direction away from the substrate 10, and the third light-emitting unit 60 includes a third lower electrode 63, a third light-emitting layer 61, and a third upper electrode 62 stacked in sequence in a direction away from the substrate 10. That is, the light-emitting layer of the first light-emitting unit 40 is the first light-emitting layer 41, the light-emitting layer of the second light-emitting unit 50 is the second light-emitting layer 51, and the light-emitting layer of the third light-emitting unit 60 is the third light-emitting layer 61.

[0120] The first light-emitting layer 41 , the second light-emitting layer 51 , and the third light-emitting layer 61 can emit light of different colors.

[0121] Exemplarily, the first light-emitting layer 41 can emit red light, that is, the first light-emitting layer 41 corresponds to R pixels, the second light-emitting layer 51 can emit green light, that is, the second light-emitting layer 51 corresponds to G pixels, and the third light-emitting layer 61 can emit blue light, that is, the third light-emitting layer 61 corresponds to B pixels.

[0122] Exemplarily, the plurality of isolation openings include a first isolation opening 301 , a second isolation opening 302 and a third isolation opening 303 . That is, some of the plurality of isolation openings are first isolation openings 301 , some are second isolation openings 302 , and the rest are third isolation openings 303 .

[0123] Among them, part of the first light-emitting unit 40 is located in the corresponding first isolation opening 301, that is, the part of the orthographic projection of the first light-emitting unit 40 on the substrate 10 is located in the orthographic projection of the corresponding first isolation opening 301 on the substrate 10; part of the second light-emitting unit 50 is located in the corresponding second isolation opening 302, that is, the part of the orthographic projection of the second light-emitting unit 50 on the substrate 10 is located in the orthographic projection of the corresponding second isolation opening 302 on the substrate 10; part of the third light-emitting unit 60 is located in the corresponding third isolation opening 303, that is, the part of the orthographic projection of the third light-emitting unit 60 on the substrate 10 is located in the orthographic projection of the corresponding third isolation opening 303 on the substrate 10.

[0124] The display panel further includes a first encapsulation layer 70, which is disposed on a side of the display function layer away from the substrate 10. The first encapsulation layer 70 includes a first encapsulation portion 71, a second encapsulation portion 72, and a third encapsulation portion 73, wherein the first encapsulation portion 71 covers the first light emitting unit 40, the second encapsulation portion 72 covers the second light emitting unit 50, and the third encapsulation portion 73 covers the third light emitting unit.

[0125] In some embodiments, when processing the display panel, the first light emitting unit 40, the second light emitting unit 50 and the third light emitting unit 60 are processed and formed in sequence, and the first packaging part 71, the second packaging part 72 and the third packaging part 73 are also processed and formed in sequence.

[0126] Of course, in other embodiments, when processing the display panel, the third light emitting unit 60, the second light emitting unit 50 and the first light emitting unit 40 are processed and formed in sequence. The third packaging part 73, the second packaging part 72 and the first packaging part 71 are also processed and formed in sequence.

[0127] The following describes the processing of display panels in some embodiments.

[0128] Please also read Figure 4 and Figure 5, a first light-emitting material and a cathode material are evaporated on a substrate 10 having an isolation structure 30, and then a packaging material is chemically vapor deposited (CVD), and then the substrate 10 is etched to remove the first light-emitting material and the cathode material outside the first isolation opening, and to remove the packaging material outside the first packaging area, to obtain a first light-emitting unit 40 and a portion of the first packaging layer 70 that encapsulates the first light-emitting unit 40 (a first packaging portion 71).

[0129] Please also read Figure 6 and Figure 7 , evaporate a second light-emitting material, a cathode material and a packaging material on the substrate 10, and then etch the substrate 10 to remove the second light-emitting material and the cathode material outside the second opening, and remove the packaging material outside the second packaging area, to obtain a second light-emitting unit 50 and a portion of the first packaging layer 70 that encapsulates the second light-emitting unit 50 (a second packaging portion 72).

[0130] Please also read Figure 3 and Figure 8 , vapor-deposit a third light-emitting material, a cathode material and a packaging material on the substrate 10, and then etch the substrate 10 to remove the third light-emitting material and the cathode material outside the third opening, and remove the packaging material outside the third packaging area, to obtain a third light-emitting unit 60 and a portion of the first packaging layer 70 that encapsulates the third light-emitting unit 60 (third packaging portion 73).

[0131] See also Fig. 9 , inkjet printing (Ink Jet Print DAM, IJP) is performed on the substrate 10 to obtain a second encapsulation layer 80, so that the second encapsulation layer 80 covers the first encapsulation layer 70 and fills the recessed portion. Then, a packaging material is chemically vapor deposited (Chemical Vapor Deposition, CVD) on the side of the second encapsulation layer 80 away from the substrate 10 to obtain a third encapsulation layer 90, so that the third encapsulation layer 90 covers the second encapsulation layer 80. It can be understood that the materials of the first encapsulation layer 70 and the third encapsulation layer 90 may include inorganic materials, and the material of the second encapsulation layer 80 may include organic materials.

[0132] The inventor found that in the related art, please refer to Figures 3 to 9 When both ends of the upper electrode overlap with the isolation structure 30, in other words, when one edge of the upper electrode overlaps with the isolation structure 30, the upper electrode is subjected to bilateral evaporation, and the overlap effect between the upper electrode and the isolation structure 30 is poor.

[0133] In order to improve the overlap effect, the inventor found that Fig.10 and Fig.11When preparing the upper electrode, a single-sided evaporation method can be used, that is, single-sided evaporation is used, and the evaporation time is extended or the number of evaporation times is increased. The total evaporation time of the upper electrode is almost unchanged, but the overlap effect between the upper electrode and the isolation structure 30 can be improved. It can be understood that compared with single-sided evaporation, double-sided evaporation is that the evaporation device 200 evaporates twice in two opposite directions.

[0134] However, please also refer to Fig.12 and Fig.13 After single-sided evaporation, one end of the upper electrode is overlapped with the isolation structure 30, and the other end is spaced from the isolation structure 30, exposing the pixel definition layer 20. When preparing a light-emitting unit in an isolation opening, it is necessary to remove the upper electrode and the light-emitting layer of the light-emitting unit in other isolation openings (for example, by an etching process), which can easily damage the exposed pixel definition layer 20, and then easily generate holes 21 in the exposed pixel definition layer 20, and even damage the lower electrode, affecting reliability and light-emitting effect.

[0135] For example, when preparing the first light-emitting unit 40, the first light-emitting layer 41 and the upper electrode of the first light-emitting unit 40 in the second isolation opening 302 and the third isolation opening 303 need to be removed, which may easily cause damage to the pixel definition layer 20 in the second isolation opening 302 and the third isolation opening 303.

[0136] For example, when preparing the second light-emitting unit 50, it is necessary to remove the second light-emitting layer 51 and the upper electrode of the second light-emitting unit 50 in the first isolation opening 301 and the third isolation opening 303. At this time, the first light-emitting unit 40 and the first packaging part 71 are already in the first isolation opening 301, which may easily cause damage to the portion of the pixel definition layer 20 in the third isolation opening 303.

[0137] For example, when preparing the third light-emitting unit 60, it is necessary to remove the third light-emitting layer 61 and the upper electrode of the third light-emitting unit 60 in the first isolation opening 301 and the second isolation opening 302. At this time, the first isolation opening 301 already has the first light-emitting unit 40 and the first packaging part 71, and the second isolation opening 302 already has the second light-emitting unit 50 and the second packaging part 72, and the pixel definition layer 20 in the first isolation opening 301 and the second isolation opening 302 will not be damaged.

[0138] It is understandable that when preparing the display function layer, the isolation structure 30 plays the role of a mask. Of course, in some embodiments, the display panel 100 can also directly use a mask to prepare the display function layer.

[0139] Therefore, when the display panel provided in the embodiment of the present application is subjected to single-side evaporation when preparing the light-emitting unit, the portion of the pixel definition layer 20 in the third isolation opening 303 is damaged twice, and the hole 21 is easily generated.

[0140] To solve the above technical problems, please refer to Fig.14 , Fig.15 and Fig.16 , a display panel provided in an embodiment of the present application is now further described.

[0141] In the display panel of the embodiment of the present application, the first light emitting layer 41 includes a first end 411 and a second end 412 opposite to the first end 411 in the first direction, and the second light emitting layer 51 includes a third end 511 and a fourth end 512 opposite to the third end 511 in the first direction. The thickness of the first upper electrode 42 located above the first end 411 and the thickness of the first upper electrode 42 located above the second end 412 have a first difference, the thickness of the second upper electrode 52 located above the third end 511 and the thickness of the second upper electrode 52 located above the fourth end 512 have a second difference, and the absolute value of the first difference is not less than the absolute value of the second difference.

[0142] Optionally, the first direction is parallel to the substrate. Optionally, the first direction is parallel to the evaporation direction of the evaporation device 200. It is understandable that the evaporation direction of the evaporation device 200 can be the direction in which the evaporation device 200 or the display panel 100 moves when the display panel 100 evaporates the display function layer.

[0143] Optionally, the first difference is not equal to 0. Optionally, the first difference is less than the maximum thickness of the first upper electrode 42 .

[0144] In this way, the thickness of the first upper electrode 42 of the first light-emitting unit 40 at two relatively opposite ends in the first direction may be inconsistent, that is, the thickness of one end of the first upper electrode 42 of the first light-emitting unit 40 in the first direction may be greater than 0 but less than the thickness of the other end. The one end of the first upper electrode 42 in the first direction can protect the film layer below to a certain extent, which is conducive to improving reliability.

[0145] It is understandable that when the first light-emitting unit 40 is double-sided evaporated, the thickness of the first light-emitting unit 40 can be changed along the first direction. For example, the thickness of the first upper electrode 42 above the first end 411 of the first light-emitting layer 41 can be greater than the thickness of the first upper electrode 42 above the second end 412, and the thickness of the first upper electrode 42 above the second end 412 is greater than 0.

[0146] Similarly, the thickness of the first upper electrode 52 of the second light-emitting unit 50 at two opposite ends in the first direction may be inconsistent, that is, the thickness of one end of the second upper electrode 52 of the second light-emitting unit 50 in the first direction may be greater than 0 but less than the thickness of the other end. The one end of the second upper electrode 52 in the first direction can protect the film layer below to a certain extent, which is conducive to improving reliability.

[0147] Therefore, the display panel provided by the embodiment of the present application can improve the performance / process performance of the display device.

[0148] In some embodiments, the display panel 100 provided in the embodiment of the present application further includes a pixel definition layer 20 and an isolation structure 30. That is, the display panel provided in the embodiment of the present application can use the isolation structure 30 to function as a mask.

[0149] As described above, the thickness of the first upper electrode 42 above the first end 411 of the first light-emitting layer 41 may be greater than the thickness of the first upper electrode 42 above the second end 412, and the thickness of the first upper electrode 42 above the second end 412 is greater than 0. The overlapping effect between the first upper electrode 42 above the first end 411 of the first light-emitting layer 41 and the isolation structure 30 may be improved, and the second end 412 may not expose the pixel definition layer 20.

[0150] Of course, in some embodiments, the thickness of the first upper electrode 42 above the second end portion 412 of the first light emitting layer 41 may be equal to 0, that is, the second end portion 412 may expose the pixel definition layer 20 .

[0151] Optionally, the pixel definition layer 20 is disposed on one side of the substrate 10, the pixel definition layer 20 includes a first pixel opening and a second pixel opening, the isolation structure 30 is disposed on the side of the pixel definition layer 20 away from the substrate 10, the first isolation opening 301 is connected to the first pixel opening, and the second isolation opening 302 is connected to the second pixel opening. The pixel definition layer 20 located on the side around the first light-emitting unit 40 has a first minimum thickness, and the pixel definition layer 20 located on the side around the second light-emitting unit 50 has a second minimum thickness, and the first minimum thickness is not greater than the second minimum thickness.

[0152] It is understandable that the first light-emitting unit 40 can be prepared after the second light-emitting unit 50. In the case where the second light-emitting unit 50 can protect the pixel definition layer 20, although the first upper electrode 42 above the second end 412 of the first light-emitting layer 41 has a weaker protective effect on the pixel definition layer 20, the pixel definition layer 20 located around the first light-emitting unit 40 will not be damaged by the etching process of preparing the second light-emitting unit 50.

[0153] In addition, when the second end portion 412 has a relatively small thickness and does not expose the pixel definition layer 20 , the display panel 100 provided in the embodiment of the present application can also protect the pixel definition layer 20 to a certain extent, which is beneficial to improving reliability.

[0154] In some embodiments, the plurality of light-emitting units further include a third light-emitting unit 60, the pixel definition layer 20 further includes a third pixel opening, the pixel definition layer 20 located around the third light-emitting unit 60 has a third minimum thickness, and the first minimum thickness is not greater than the third minimum thickness.

[0155] It is understandable that the first light-emitting unit 40 can be prepared after the third light-emitting unit 60. In the case where the third light-emitting unit 60 can protect the pixel definition layer 20, although the first upper electrode 42 above the second end 412 of the first light-emitting layer 41 has a weaker protective effect on the pixel definition layer 20, the pixel definition layer 20 located around the first light-emitting unit 40 will not be damaged by the etching process of preparing the third light-emitting unit 60.

[0156] It is understandable that the first light-emitting unit 40 is prepared last, and will not damage the pixel definition layer 20 around the second light-emitting unit 50 and the third light-emitting unit 60. In addition, when the first light-emitting unit 40, the second light-emitting unit 50 and the third light-emitting unit 60 are prepared, they will not damage the pixel definition layer 20 around themselves.

[0157] See also Fig.14 In some embodiments, the first minimum thickness, the second minimum thickness, and the third minimum thickness are equal. It is understandable that the pixel definition layer 20 around the first light-emitting unit 40, the pixel definition layer 20 around the second light-emitting unit 50, and the pixel definition layer 20 around the third light-emitting unit 60 are damaged to the same extent, so the first minimum thickness, the second minimum thickness, and the third minimum thickness can be equal.

[0158] Optionally, the absolute value of the first difference is greater than the absolute value of the second difference.

[0159] Optionally, the third light-emitting unit 60 includes a third light-emitting layer 61 and a third upper electrode 62 which are stacked in sequence along a direction away from the substrate 10, the third light-emitting layer 61 includes a fifth end 611 and a sixth end 612 opposite to the fifth end 611 in the first direction, and the thickness of the third upper electrode 62 located above the fifth end 611 and the thickness of the third upper electrode 62 located above the sixth end 612 have a third difference, wherein the absolute value of the first difference is greater than the absolute value of the third difference.

[0160] It is understandable that the first light-emitting unit 40 can be prepared after the second light-emitting unit 50 and the third light-emitting unit 60. When the third light-emitting unit 60 is prepared, the third upper electrode 62 of the third light-emitting unit 60 can protect the pixel definition layer 20 around the first light-emitting unit 40 and the second light-emitting unit 50, and the pixel definition layer 20 around the first light-emitting unit 40 and the second light-emitting unit 50 is not damaged. When the second light-emitting unit 50 is prepared, the second upper electrode 52 of the second light-emitting unit 50 can protect the pixel definition layer 20 around the first light-emitting unit 40, and the pixel definition layer 20 around the first light-emitting unit 40 is not damaged. Therefore, the pixel definition layer 20 around the first light-emitting unit 40, the second light-emitting unit 50 and the third light-emitting unit 60 is not damaged, and the first minimum thickness, the second minimum thickness and the third minimum thickness are equal.

[0161] Optionally, the thickness of the first upper electrode 42 located above the first end 411 is greater than the thickness of the first upper electrode 42 located above the second end 412, wherein the first upper electrode 42 located above the first end 411 overlaps the isolation structure 30, and the first upper electrode 42 located above the second end 412 is spaced apart from the isolation structure 30.

[0162] Optionally, the second upper electrode 52 located above the third end 511 and the second upper electrode 52 located above the fourth end 512 are both overlapped with the isolation structure 30 .

[0163] Optionally, the third upper electrode 62 located above the fifth end 611 and the third upper electrode 62 located above the sixth end 612 are both overlapped with the isolation structure 30 .

[0164] Optionally, the second light-emitting unit 50 and the third light-emitting unit 60 may both be deposited by double-sided evaporation, and the first light-emitting unit 40 may be deposited by single-sided evaporation.

[0165] Optionally, the orthographic projection of the first light-emitting layer 41 on the substrate 10 is located outside the orthographic projection of the first upper electrode 42 on the substrate 10, the orthographic projection of the second light-emitting layer 51 on the substrate 10 is located within the orthographic projection of the second upper electrode 52 on the substrate 10, and the orthographic projection of the third light-emitting layer 61 on the substrate 10 is located within the orthographic projection of the third upper electrode 62 on the substrate 10.

[0166] Optionally, the light color of the first light emitting unit 40 is red, the light color of the second light emitting unit 50 is one of blue and green, and the light color of the third light emitting unit 60 is the other of blue and green. Exemplarily, the light color of the second light emitting unit 50 is green, and the light color of the third light emitting unit 60 is blue.

[0167] See also Fig.15In some embodiments, the first minimum thickness is less than the third minimum thickness, and the second minimum thickness is less than the third minimum thickness. It is understandable that the degree of damage to the pixel definition layer 20 around the first light-emitting unit 40 and the pixel definition layer 20 around the second light-emitting unit 50 is less than the degree of damage to the pixel definition layer 20 around the third light-emitting unit 60, so that the first minimum thickness and the second minimum thickness can be less than the third minimum thickness.

[0168] For example, the first minimum thickness may be equal to the second minimum thickness. That is, the pixel definition layer 20 around the first light emitting unit 40 and the pixel definition layer 20 around the second light emitting unit 50 are damaged to the same extent.

[0169] Optionally, the absolute value of the first difference is greater than the absolute value of the second difference.

[0170] Optionally, the third light-emitting unit 60 includes a third light-emitting layer 61 and a third upper electrode 62 which are stacked in sequence along a direction away from the substrate 10, the third light-emitting layer 61 includes a fifth end 611 and a sixth end 612 opposite to the fifth end 611 in the first direction, and the thickness of the third upper electrode 62 located above the fifth end 611 and the thickness of the third upper electrode 62 located above the sixth end 612 have a third difference, wherein the absolute value of the third difference is greater than the absolute value of the second difference.

[0171] It is understandable that the first light-emitting unit 40 can be prepared after the second light-emitting unit 50, and the second light-emitting unit 50 can be prepared after the third light-emitting unit 60. When preparing the third light-emitting unit 60, the pixel definition layer 20 on the surrounding side of itself will not be damaged. The third upper electrode 62 of the third light-emitting unit 60 cannot protect the pixel definition layer 20 on the surrounding side of the first light-emitting unit 40 and the second light-emitting unit 50. When preparing the third light-emitting unit 60, the pixel definition layer 20 on the surrounding side of the first light-emitting unit 40 and the second light-emitting unit 50 will be damaged. Therefore, the first minimum thickness and the second minimum thickness are less than the third minimum thickness.

[0172] Optionally, the thickness of the first upper electrode 42 located above the first end 411 is greater than the thickness of the first upper electrode 42 located above the second end 412, wherein the first upper electrode 42 located above the first end 411 overlaps the isolation structure 30, and the first upper electrode 42 located above the second end 412 is spaced apart from the isolation structure 30.

[0173] Optionally, the second upper electrode 52 located above the third end 511 and the second upper electrode 52 located above the fourth end 512 are both overlapped with the isolation structure 30 .

[0174] Optionally, the thickness of the third upper electrode 62 located above the fifth end 611 is greater than the thickness of the third upper electrode 62 located above the sixth end 612, wherein the third upper electrode 62 located above the fifth end 611 overlaps the isolation structure 30, and the third upper electrode 62 located above the sixth end 612 is spaced apart from the isolation structure 30.

[0175] Optionally, the third light-emitting unit 60 may be deposited on one side, the second light-emitting unit 50 may be deposited on two sides, and the first light-emitting unit 40 may be deposited on one side.

[0176] Optionally, the orthographic projection of the first light-emitting layer 41 on the substrate 10 is located outside the orthographic projection of the first upper electrode 42 on the substrate 10, the orthographic projection of the second light-emitting layer 51 on the substrate 10 is located within the orthographic projection of the second upper electrode 52 on the substrate 10, and the orthographic projection of the third light-emitting layer 61 on the substrate 10 is located outside the orthographic projection of the third upper electrode 62 on the substrate 10.

[0177] Optionally, the light color of the first light emitting unit 40 is red, the light color of the second light emitting unit 50 is one of blue and green, and the light color of the third light emitting unit 60 is the other of blue and green. Exemplarily, the light color of the second light emitting unit 50 is green, and the light color of the third light emitting unit 60 is blue.

[0178] In some embodiments, the first minimum thickness is less than the second minimum thickness, and the first minimum thickness is less than the third minimum thickness. It is understood that the degree of damage to the pixel definition layer 20 around the first light-emitting unit 40 is less than the degree of damage to the pixel definition layer 20 around the second light-emitting unit 50 and the pixel definition layer 20 around the third light-emitting unit 60, so that the first minimum thickness can be less than the second minimum thickness and the third minimum thickness.

[0179] Optionally, the second minimum thickness is equal to the third minimum thickness. That is, the pixel definition layer 20 around the second light emitting unit 50 and the pixel definition layer 20 around the third light emitting unit 60 are damaged to the same extent.

[0180] Optionally, the third light-emitting unit 60 includes a third light-emitting layer 61 and a third upper electrode 62 which are stacked in sequence along a direction away from the substrate 10, the third light-emitting layer 61 includes a fifth end 611 and a sixth end 612 opposite to the fifth end 611 in the first direction, and the thickness of the third upper electrode 62 located above the fifth end 611 and the thickness of the third upper electrode 62 located above the sixth end 612 have a third difference, wherein the absolute value of the third difference is smaller than the absolute value of the first difference, and the absolute value of the third difference is smaller than the absolute value of the second difference.

[0181] It is understandable that the first light-emitting unit 40 can be prepared after the second light-emitting unit 50, and the second light-emitting unit 50 can be prepared after the third light-emitting unit 60. The third upper electrode 62 of the third light-emitting unit 60 can protect the pixel definition layer 20 around the third light-emitting unit 60, and can also protect the pixel definition layer 20 around the second light-emitting unit 50, and the pixel definition layer 20 around the second light-emitting unit 50 and the third light-emitting unit 60 is not damaged. The second upper electrode 52 of the second light-emitting unit 50 cannot protect the pixel definition layer 20 around the first light-emitting unit 40, and the first light-emitting unit 40 cannot damage the pixel definition layer 20 around itself, so the first minimum thickness is less than the second minimum thickness and the third minimum thickness.

[0182] Optionally, the thickness of the first upper electrode 42 located above the first end 411 is greater than the thickness of the first upper electrode 42 located above the second end 412, wherein the first upper electrode 42 located above the first end 411 overlaps the isolation structure 30, and the first upper electrode 42 located above the second end 412 is spaced apart from the isolation structure 30.

[0183] Optionally, the thickness of the second upper electrode 52 located above the third end 511 is greater than the thickness of the second upper electrode 52 located above the fourth end 512, wherein the second upper electrode 52 located above the third end 511 overlaps the isolation structure 30, and the second upper electrode 52 located above the fourth end 512 is spaced apart from the isolation structure 30.

[0184] Optionally, the third upper electrode 62 located above the fifth end 611 and the third upper electrode 62 located above the sixth end 612 are both overlapped with the isolation structure 30 .

[0185] Optionally, the third light-emitting unit 60 may be deposited by double-sided evaporation, the second light-emitting unit 50 may be deposited by single-sided evaporation, and the first light-emitting unit 40 may be deposited by single-sided evaporation.

[0186] Optionally, the orthographic projection of the first light-emitting layer 41 on the substrate 10 is located outside the orthographic projection of the first upper electrode 42 on the substrate 10, the orthographic projection of the second light-emitting layer 51 on the substrate 10 is located outside the orthographic projection of the second upper electrode 52 on the substrate 10, and the orthographic projection of the third light-emitting layer 61 on the substrate 10 is located within the orthographic projection of the third upper electrode 62 on the substrate 10.

[0187] Optionally, the light color of the first light emitting unit 40 is red, the light color of the second light emitting unit 50 is one of blue and green, and the light color of the third light emitting unit 60 is the other of blue and green. Exemplarily, the light color of the second light emitting unit 50 is green, and the light color of the third light emitting unit 60 is blue.

[0188] Please also read Fig.14 , Fig.15 ,and Fig.16 In some embodiments, the isolation structure 30 includes a first layer 31, a second layer 32, and a third layer 33 which are stacked in sequence along a direction away from the substrate 10, the orthographic projection of the second layer 32 on the substrate 10 is located within the orthographic projection of the first layer 31 on the substrate 10, and the orthographic projection of the surface of the second layer 32 close to the third layer 33 on the substrate 10 is located within the orthographic projection of the third layer 33 on the substrate 10.

[0189] Optionally, the area of ​​the orthographic projection of the second layer 32 on the substrate 10 is smaller than the area of ​​the orthographic projection of the first layer 31 on the substrate 10 , and the area of ​​the orthographic projection of the surface of the second layer 32 close to the third layer 33 on the substrate 10 is smaller than the area of ​​the orthographic projection of the third layer 33 on the substrate 10 .

[0190] It is understandable that the material of the first layer 31 may be molybdenum (Mo), the material of the second layer 32 may be aluminum (Al), and the material of the third layer 33 may be titanium (Ti). Compared with molybdenum and titanium, aluminum is easier to etch, so the area of ​​the orthographic projection of the second layer 32 on the substrate 10 is the smallest.

[0191] In some embodiments, the first light emitting unit 40 further includes a first lower electrode 43 located on the side of the first light emitting layer 41 facing the substrate 10, a portion of the first lower electrode 43 is located between the substrate 10 and the pixel definition layer 20, and another portion is exposed from the first pixel opening. Therefore, the first light emitting layer 41 can be connected to the first lower electrode 43.

[0192] Optionally, the second light-emitting unit 50 further includes a second lower electrode 53 located on the side of the second light-emitting layer 51 facing the substrate 10, a portion of the second lower electrode 53 is located between the substrate 10 and the pixel definition layer 20, and another portion is exposed from the second pixel opening. Therefore, the second light-emitting layer 51 can be connected to the second lower electrode 53.

[0193] Optionally, the third light emitting unit 60 further includes a third lower electrode 63 located on the side of the third light emitting layer 61 facing the substrate 10, a portion of the third lower electrode 63 is located between the substrate 10 and the pixel definition layer 20, and another portion is exposed from the third pixel opening. Therefore, the third light emitting layer 61 can be connected to the third lower electrode 63.

[0194] Please also read Fig.14 , Fig.15 ,and Fig.16 The display panel 100 provided in the embodiment of the present application further includes a first encapsulation layer 70, which is located on the side of the light-emitting unit away from the substrate 10, and the orthographic projection of the light-emitting unit on the substrate 10 is located within the orthographic projection range of the first encapsulation layer 70 on the substrate 10 0.

[0195] Optionally, the material of the first encapsulation layer 70 includes an inorganic material.

[0196] Optionally, the material of the first encapsulation layer 70 includes one of silicon oxide and silicon nitride.

[0197] Optionally, the first encapsulation layer 70 includes a first encapsulation part 71, a second encapsulation part 72 and a third encapsulation part 73, the orthographic projection of the first light-emitting unit 40 on the substrate 10 is located within the orthographic projection range of the first encapsulation part on the substrate 10, the orthographic projection of the second light-emitting unit 50 on the substrate 10 is located within the orthographic projection range of the second encapsulation part on the substrate 10, and the orthographic projection of the second light-emitting unit 50 on the substrate 10 is located within the orthographic projection range of the second encapsulation part on the substrate 10.

[0198] Optionally, see Fig. 9 In some embodiments, the display panel 100 provided in the embodiment of the present application may further include a second encapsulation layer 80 and a third encapsulation layer 90, the second encapsulation layer 80 is located on the side of the first encapsulation layer 70 away from the substrate 10, and the third encapsulation layer 90 is located on the side of the second encapsulation layer 80 away from the substrate 10.

[0199] Optionally, the first encapsulation layer 70 may be an inorganic encapsulation layer formed by chemical vapor deposition (CVD) and patterning.

[0200] Optionally, the second encapsulation layer 80 may be made by ink jet printing (IJP).

[0201] Optionally, the third encapsulation layer 90 may be an inorganic encapsulation layer formed by chemical vapor deposition (CVD).

[0202] Optionally, the display panel 100 provided in the present application may further include other film layers, and the other film layers are located on the side of the third encapsulation layer 90 away from the substrate 10. The other film layers may include polarizing films, optically clear adhesives (OCA), and the like.

[0203] See also Fig.17 In some embodiments, the present application also provides a method for preparing a display panel 100, the method comprising:

[0204] S1, providing a substrate 10.

[0205] S2. Prepare a light-emitting unit on one side of the substrate 10. There are multiple light-emitting units, and the light-emitting units include a first light-emitting unit 40 and a second light-emitting unit 50. The first light-emitting unit 40 includes a first light-emitting layer 41 and a first upper electrode 42 which are sequentially stacked in a direction away from the substrate 10. The first light-emitting layer 41 includes a first end 411 and a second end 412 which is opposite to the first end 411 in the first direction. The second light-emitting unit 50 includes a second light-emitting layer 51 and a second upper electrode 52 which are sequentially stacked in a direction away from the substrate 10. The second light-emitting layer 51 includes a third end 511 and a fourth end 512 which is opposite to the third end 511 in the first direction.

[0206] Among them, the thickness of the first upper electrode 42 located above the first end 411 and the thickness of the first upper electrode 42 located above the second end 412 have a first difference, the thickness of the second upper electrode 52 located above the third end 511 and the thickness of the second upper electrode 52 located above the fourth end 512 have a second difference, and the absolute value of the first difference is not less than the absolute value of the second difference.

[0207] Optionally, the first difference is not equal to 0.

[0208] In this way, the display panel 100 prepared by the preparation method of the embodiment of the present application can protect the pixel definition layer 20 to a certain extent.

[0209] See also Fig.18 In some embodiments, the present application also provides a method for preparing a display panel 100, the method comprising:

[0210] S1, providing a substrate 10.

[0211] S2 , preparing a pixel definition layer 20 on one side of the substrate 10 .

[0212] S3 , preparing an isolation structure 30 on a side of the pixel definition layer 20 facing away from the substrate 10 .

[0213] S4 , patterning the isolation structure 30 to form a first isolation opening 301 , a second isolation opening 302 and a third isolation opening 303 .

[0214] S5 , the patterned pixel definition layer 20 forms a first pixel opening, a second pixel opening and a third pixel opening, the first pixel opening is connected to the first isolation opening 301 , the second pixel opening is connected to the second isolation opening 302 , and the third pixel opening is connected to the third isolation opening 303 .

[0215] S6. Prepare a light-emitting unit on one side of the substrate 10. There are multiple light-emitting units, and the light-emitting units include a first light-emitting unit 40 and a second light-emitting unit 50. The first light-emitting unit 40 includes a first light-emitting layer 41 and a first upper electrode 42 which are sequentially stacked in a direction away from the substrate 10. The first light-emitting layer 41 includes a first end 411 and a second end 412 which is opposite to the first end 411 in the first direction. The second light-emitting unit 50 includes a second light-emitting layer 51 and a second upper electrode 52 which are sequentially stacked in a direction away from the substrate 10. The second light-emitting layer 51 includes a third end 511 and a fourth end 512 which is opposite to the third end 511 in the first direction.

[0216] Optionally, the thickness of the first upper electrode 42 located above the first end 411 has a first difference with the thickness of the first upper electrode 42 located above the second end 412, the thickness of the second upper electrode 52 located above the third end 511 has a second difference with the thickness of the second upper electrode 52 located above the fourth end 512, and the absolute value of the first difference is not less than the absolute value of the second difference.

[0217] Optionally, the first difference is not equal to 0.

[0218] Optionally, the pixel definition layer 20 located around the first light emitting unit 40 has a first minimum thickness, and the pixel definition layer 20 located around the second light emitting unit 50 has a second minimum thickness, and the first minimum thickness is not greater than the second minimum thickness.

[0219] Optionally, the light-emitting unit further includes a third light-emitting unit 60 , the pixel definition layer 20 located around the third light-emitting unit 60 has a third minimum thickness, and the first minimum thickness is not greater than the third minimum thickness.

[0220] See also Fig.19 In some embodiments, in step S6, preparing a light-emitting unit on one side of the substrate 10 includes:

[0221] S61, preparing a third light emitting unit 60, wherein a portion of the third light emitting unit 60 is disposed in the third isolation opening 303;

[0222] S62, preparing a second light-emitting unit 50, wherein a portion of the second light-emitting unit 50 is disposed in the second isolation opening 302;

[0223] S63 , preparing a first light emitting unit 40 , wherein a portion of the first light emitting unit 40 is disposed in the first isolation opening 301 .

[0224] Optionally, the light color of the first light emitting unit 40 is red, the light color of the second light emitting unit 50 is one of blue and green, and the light color of the third light emitting unit 60 is the other of blue and green. Exemplarily, the light color of the second light emitting unit 50 is green, and the light color of the third light emitting unit 60 is blue.

[0225] It is understandable that the manufacturing method provided in the embodiment of the present application can manufacture the display panel 100 of any of the above embodiments. Fig.14 , Fig.15 as well as Fig.16 Any display panel 100 shown in .

[0226] The embodiment of the present application also provides a display device, which can be a mobile phone, a television, a tablet computer, a laptop computer, a desktop computer, a vehicle-mounted display terminal, a wearable device, an advertising display device, etc. Optionally, the display device provided in the embodiment of the present application includes the display panel 100 of any of the above embodiments. The display device provided in the embodiment of the present application has the same or similar technical effects as the display panel 100 of any of the above embodiments, which will not be repeated here.

[0227] The above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A plurality of light-emitting units are arranged on one side of the substrate, including a first light-emitting unit and a second light-emitting unit, wherein the first light-emitting unit includes a first light-emitting layer and a first upper electrode sequentially stacked in a direction away from the substrate, the first light-emitting layer includes a first end and a second end opposite to the first end in the first direction, the second light-emitting unit includes a second light-emitting layer and a second upper electrode sequentially stacked in a direction away from the substrate, the second light-emitting layer includes a third end and a fourth end opposite to the third end in the first direction; Among them, the thickness of the first upper electrode located above the first end and the thickness of the first upper electrode located above the second end have a first difference, the thickness of the second upper electrode located above the third end and the thickness of the second upper electrode located above the fourth end have a second difference, the absolute value of the first difference is not less than the absolute value of the second difference, and the first difference is not equal to 0.

2. The display panel according to claim 1, wherein: Also includes: A pixel definition layer, disposed on one side of the substrate, comprising a first pixel opening and a second pixel opening; an isolation structure, arranged on a side of the pixel definition layer away from the substrate, comprising a first isolation opening and a second isolation opening, wherein the first isolation opening is connected to the first pixel opening, the second isolation opening is connected to the second pixel opening, a portion of the first light emitting unit is arranged in the first isolation opening, and a portion of the second light emitting unit is arranged in the second isolation opening; The pixel definition layer located around the first light-emitting unit has a first minimum thickness, the pixel definition layer located around the second light-emitting unit has a second minimum thickness, and the first minimum thickness is not greater than the second minimum thickness.

3. The display panel according to claim 2, wherein: The plurality of light-emitting units further include a third light-emitting unit, the pixel definition layer further includes a third pixel opening, the isolation structure further includes a third isolation opening, the third isolation opening is connected to the third pixel opening, and a portion of the third light-emitting unit is disposed in the third isolation opening, wherein: The pixel definition layer located at the peripheral side of the third light emitting unit has a third minimum thickness, and the first minimum thickness is not greater than the third minimum thickness.

4. The display panel according to claim 3, wherein: The first minimum thickness, the second minimum thickness and the third minimum thickness are equal; Preferably, the absolute value of the first difference is greater than the absolute value of the second difference; Preferably, the third light-emitting unit comprises a third light-emitting layer and a third upper electrode which are sequentially stacked in a direction away from the substrate, the third light-emitting layer comprises a fifth end and a sixth end opposite to the fifth end in the first direction, a thickness of the third upper electrode located above the fifth end and a thickness of the third upper electrode located above the sixth end have a third difference, wherein an absolute value of the first difference is greater than an absolute value of the third difference; Preferably, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure; Preferably, the second upper electrode located above the third end and the second upper electrode located above the fourth end are both overlapped with the isolation structure; Preferably, the third upper electrode located above the fifth end and the third upper electrode located above the sixth end are both overlapped with the isolation structure; Preferably, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is one of blue and green, and the light emitting color of the third light emitting unit is the other of blue and green.

5. The display panel according to claim 3, wherein: The first minimum thickness is smaller than the third minimum thickness, and the second minimum thickness is smaller than the third minimum thickness; Preferably, the absolute value of the first difference is greater than the absolute value of the second difference; Preferably, the third light-emitting unit comprises a third light-emitting layer and a third upper electrode which are sequentially stacked in a direction away from the substrate, the third light-emitting layer comprises a fifth end and a sixth end opposite to the fifth end in the first direction, a thickness of the third upper electrode located above the fifth end and a thickness of the third upper electrode located above the sixth end have a third difference, wherein an absolute value of the third difference is greater than an absolute value of the second difference; Preferably, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure; Preferably, the second upper electrode located above the third end and the second upper electrode located above the fourth end are both overlapped with the isolation structure; Preferably, the thickness of the third upper electrode located above the fifth end is greater than the thickness of the third upper electrode located above the sixth end, wherein the third upper electrode located above the fifth end overlaps the isolation structure, and the third upper electrode located above the sixth end is spaced apart from the isolation structure; Preferably, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is green, and the light emitting color of the third light emitting unit is blue.

6. The display panel according to claim 3, wherein: The first minimum thickness is less than the second minimum thickness, and the first minimum thickness is less than the third minimum thickness; Preferably, the third light-emitting unit comprises a third light-emitting layer and a third upper electrode which are sequentially stacked in a direction away from the substrate, the third light-emitting layer comprises a fifth end and a sixth end opposite to the fifth end in the first direction, and a thickness of the third upper electrode located above the fifth end and a thickness of the third upper electrode located above the sixth end have a third difference, wherein an absolute value of the third difference is smaller than an absolute value of the first difference, and an absolute value of the third difference is smaller than an absolute value of the second difference; Preferably, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure; Preferably, the thickness of the second upper electrode located above the third end is greater than the thickness of the second upper electrode located above the fourth end, wherein the second upper electrode located above the third end overlaps the isolation structure, and the second upper electrode located above the fourth end is spaced apart from the isolation structure; Preferably, the third upper electrode located above the fifth end and the third upper electrode located above the sixth end are both overlapped with the isolation structure; Preferably, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is green, and the light emitting color of the third light emitting unit is blue.

7. The display panel according to claim 4, wherein: The orthographic projection of the first light-emitting layer on the substrate is located outside the orthographic projection of the first upper electrode on the substrate, the orthographic projection of the second light-emitting layer on the substrate is located within the orthographic projection of the second upper electrode on the substrate, and the orthographic projection of the third light-emitting layer on the substrate is located within the orthographic projection of the third upper electrode on the substrate.

8. The display panel according to claim 5, wherein: The orthographic projection of the first light-emitting layer on the substrate is located outside the orthographic projection of the first upper electrode on the substrate, the orthographic projection of the second light-emitting layer on the substrate is located within the orthographic projection of the second upper electrode on the substrate, and the orthographic projection of the third light-emitting layer on the substrate is located outside the orthographic projection of the third upper electrode on the substrate.

9. The display panel according to claim 6, wherein: The orthographic projection of the first light-emitting layer on the substrate is located outside the orthographic projection of the first upper electrode on the substrate, the orthographic projection of the second light-emitting layer on the substrate is located outside the orthographic projection of the second upper electrode on the substrate, and the orthographic projection of the third light-emitting layer on the substrate is located within the orthographic projection of the third upper electrode on the substrate.

10. The display panel according to claim 2, wherein: The isolation structure comprises a first layer, a second layer and a third layer which are sequentially stacked in a direction away from the substrate, wherein the orthographic projection of the second layer on the substrate is located within the orthographic projection of the first layer on the substrate, and the orthographic projection of the surface of the second layer close to the third layer on the substrate is located within the orthographic projection of the third layer on the substrate; Preferably, the area of ​​the orthographic projection of the second layer on the substrate is smaller than the area of ​​the orthographic projection of the first layer on the substrate, and the area of ​​the orthographic projection of the surface of the second layer close to the third layer on the substrate is smaller than the area of ​​the orthographic projection of the third layer on the substrate.

11. The display panel according to claim 3, wherein: The first light-emitting unit further includes a first lower electrode located on a side of the first light-emitting layer facing the substrate, a portion of the first lower electrode being located between the substrate and the pixel definition layer, and another portion of the first lower electrode being exposed from the first pixel opening; The second light-emitting unit further includes a second lower electrode located on the side of the second light-emitting layer facing the substrate, a portion of the second lower electrode is located between the substrate and the pixel definition layer, and another portion is exposed from the second pixel opening; The third light-emitting unit includes a third light-emitting layer and a third upper electrode which are stacked in sequence along a direction away from the substrate. The third light-emitting unit also includes a third lower electrode located on the side of the third light-emitting layer facing the substrate. A portion of the third lower electrode is located between the substrate and the pixel definition layer, and another portion is exposed from the third pixel opening.

12. A display panel, characterized in that: include: substrate; An isolation structure, disposed on one side of the substrate, comprising a first isolation opening and a second isolation opening; A plurality of light-emitting units, including a first light-emitting unit and a second light-emitting unit, wherein a portion of the first light-emitting unit is disposed in the first isolation opening, the first light-emitting unit includes a first light-emitting layer and a first upper electrode sequentially stacked in a direction away from the substrate, the first light-emitting layer includes a first end and a second end opposite to the first end in the first direction, a portion of the second light-emitting unit is disposed in the second isolation opening, the second light-emitting unit includes a second light-emitting layer and a second upper electrode sequentially stacked in a direction away from the substrate, the second light-emitting layer includes a third end and a fourth end opposite to the third end in the first direction; Among them, the thickness of the first upper electrode located above the first end and the thickness of the first upper electrode located above the second end have a first difference, the thickness of the second upper electrode located above the third end and the thickness of the second upper electrode located above the fourth end have a second difference, and the absolute value of the first difference is not less than the absolute value of the second difference.

13. The display panel according to claim 12, wherein: Also includes: A pixel definition layer is disposed on one side of the substrate and includes a first pixel opening and a second pixel opening. The isolation structure is disposed on a side of the pixel definition layer away from the substrate. The first isolation opening is connected to the first pixel opening, and the second isolation opening is connected to the second pixel opening. The pixel definition layer located around the first light-emitting unit has a first minimum thickness, the pixel definition layer located around the second light-emitting unit has a second minimum thickness, and the first minimum thickness is not greater than the second minimum thickness.

14. A method for preparing a display panel, characterized in that: include: providing a substrate; A light-emitting unit is prepared on one side of the substrate, wherein the light-emitting unit is a plurality of light-emitting units, and the light-emitting unit includes a first light-emitting unit and a second light-emitting unit, wherein the first light-emitting unit includes a first light-emitting layer and a first upper electrode sequentially stacked in a direction away from the substrate, wherein the first light-emitting layer includes a first end and a second end opposite to the first end in the first direction, and the second light-emitting unit includes a second light-emitting layer and a second upper electrode sequentially stacked in a direction away from the substrate, wherein the second light-emitting layer includes a third end and a fourth end opposite to the third end in the first direction; Among them, the thickness of the first upper electrode located above the first end and the thickness of the first upper electrode located above the second end have a first difference, the thickness of the second upper electrode located above the third end and the thickness of the second upper electrode located above the fourth end have a second difference, the absolute value of the first difference is not less than the absolute value of the second difference, and the first difference is not equal to 0.

15. The preparation method according to claim 14, characterized in that: Before preparing the light-emitting unit on one side of the substrate, the preparation method further includes: preparing a pixel definition layer on one side of the substrate; Prepare an isolation structure on a side of the pixel definition layer away from the substrate; Patterning the isolation structure to form a first isolation opening, a second isolation opening, and a third isolation opening; Patterning the pixel definition layer to form a first pixel opening, a second pixel opening, and a third pixel opening, wherein the first pixel opening is connected to the first isolation opening, the second pixel opening is connected to the second isolation opening, and the third pixel opening is connected to the third isolation opening; The pixel definition layer located around the first light-emitting unit has a first minimum thickness, the pixel definition layer located around the second light-emitting unit has a second minimum thickness, and the first minimum thickness is not greater than the second minimum thickness.

16. The preparation method according to claim 15, characterized in that: The light-emitting unit further includes a third light-emitting unit, and the preparation of the light-emitting unit on one side of the substrate includes: preparing the third light-emitting unit, wherein a portion of the third light-emitting unit is disposed in the third isolation opening; preparing the second light-emitting unit, wherein a portion of the second light-emitting unit is disposed in the second isolation opening; preparing the first light-emitting unit, wherein a portion of the first light-emitting unit is disposed in the first isolation opening; The pixel definition layer located at the peripheral side of the third light emitting unit has a third minimum thickness, and the first minimum thickness is not greater than the third minimum thickness.

17. The preparation method according to claim 15, characterized in that: The light-emitting unit further includes a third light-emitting unit, and the preparation of the light-emitting unit on one side of the substrate includes: preparing the third light-emitting unit, wherein a portion of the third light-emitting unit is disposed in the third isolation opening; preparing the second light-emitting unit, wherein a portion of the second light-emitting unit is disposed in the second isolation opening; preparing the first light-emitting unit, wherein a portion of the first light-emitting unit is disposed in the first isolation opening; The pixel definition layer located at the peripheral side of the third light-emitting unit has a third minimum thickness, and the first minimum thickness, the second minimum thickness and the third minimum thickness are equal; Preferably, the absolute value of the first difference is greater than the absolute value of the second difference; Preferably, the third light-emitting unit comprises a third light-emitting layer and a third upper electrode which are sequentially stacked in a direction away from the substrate, the third light-emitting layer comprises a fifth end and a sixth end opposite to the fifth end in the first direction, a thickness of the third upper electrode located above the fifth end and a thickness of the third upper electrode located above the sixth end have a third difference, wherein an absolute value of the first difference is greater than an absolute value of the third difference; Preferably, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure; Preferably, the second upper electrode located above the third end and the second upper electrode located above the fourth end are both overlapped with the isolation structure; Preferably, the third upper electrode located above the fifth end and the third upper electrode located above the sixth end are both overlapped with the isolation structure; Preferably, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is one of blue and green, and the light emitting color of the third light emitting unit is the other of blue and green.

18. The preparation method according to claim 15, characterized in that: The light-emitting unit further includes a third light-emitting unit, and the preparation of the light-emitting unit on one side of the substrate includes: preparing the third light-emitting unit, wherein a portion of the third light-emitting unit is disposed in the third isolation opening; preparing the second light-emitting unit, wherein a portion of the second light-emitting unit is disposed in the second isolation opening; preparing the first light-emitting unit, wherein a portion of the first light-emitting unit is disposed in the first isolation opening; The pixel definition layer located on the peripheral side of the third light-emitting unit has a third minimum thickness, the first minimum thickness is less than the third minimum thickness, and the second minimum thickness is less than the third minimum thickness; Preferably, the absolute value of the first difference is greater than the absolute value of the second difference; Preferably, the third light-emitting unit comprises a third light-emitting layer and a third upper electrode which are sequentially stacked in a direction away from the substrate, the third light-emitting layer comprises a fifth end and a sixth end opposite to the fifth end in the first direction, a thickness of the third upper electrode located above the fifth end and a thickness of the third upper electrode located above the sixth end have a third difference, wherein an absolute value of the third difference is greater than an absolute value of the second difference; Preferably, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure; Preferably, the second upper electrode located above the third end and the second upper electrode located above the fourth end are both overlapped with the isolation structure; Preferably, the thickness of the third upper electrode located above the fifth end is greater than the thickness of the third upper electrode located above the sixth end, wherein the third upper electrode located above the fifth end overlaps the isolation structure, and the third upper electrode located above the sixth end is spaced apart from the isolation structure; Preferably, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is green, and the light emitting color of the third light emitting unit is blue.

19. The preparation method according to claim 15, characterized in that: The light-emitting unit further includes a third light-emitting unit, and the preparation of the light-emitting unit on one side of the substrate includes: preparing the third light-emitting unit, wherein a portion of the third light-emitting unit is disposed in the third isolation opening; preparing the second light-emitting unit, wherein a portion of the second light-emitting unit is disposed in the second isolation opening; preparing the first light-emitting unit, wherein a portion of the first light-emitting unit is disposed in the first isolation opening; The pixel definition layer located on the peripheral side of the third light-emitting unit has a third minimum thickness, the first minimum thickness is less than the second minimum thickness, and the first minimum thickness is less than the third minimum thickness; Preferably, the third light-emitting unit comprises a third light-emitting layer and a third upper electrode which are sequentially stacked in a direction away from the substrate, the third light-emitting layer comprises a fifth end and a sixth end opposite to the fifth end in the first direction, and a thickness of the third upper electrode located above the fifth end and a thickness of the third upper electrode located above the sixth end have a third difference, wherein an absolute value of the third difference is smaller than an absolute value of the first difference, and an absolute value of the third difference is smaller than an absolute value of the second difference; Preferably, the thickness of the first upper electrode located above the first end is greater than the thickness of the first upper electrode located above the second end, wherein the first upper electrode located above the first end overlaps the isolation structure, and the first upper electrode located above the second end is spaced apart from the isolation structure; Preferably, the thickness of the second upper electrode located above the third end is greater than the thickness of the second upper electrode located above the fourth end, wherein the second upper electrode located above the third end overlaps the isolation structure, and the second upper electrode located above the fourth end is spaced apart from the isolation structure; Preferably, the third upper electrode located above the fifth end and the third upper electrode located above the sixth end are both overlapped with the isolation structure; Preferably, the light emitting color of the first light emitting unit is red, the light emitting color of the second light emitting unit is green, and the light emitting color of the third light emitting unit is blue.

20. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 13.

Images