Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel and a preparation method thereof and a display device, the display panel comprises a substrate, an isolation structure and a first packaging layer, the isolation structure is arranged on one side of the substrate, the isolation structure defines an isolation opening, the isolation structure comprises a first isolation layer and a second isolation layer which are sequentially stacked in the direction away from the substrate, and the first packaging layer is arranged on the first isolation layer. The orthographic projection of the first isolation layer on the substrate is located in the orthographic projection of the second isolation layer on the substrate; the isolation structure further comprises a first protrusion, and the first protrusion is arranged on the side, facing the substrate, of the second isolation layer in a protruding mode. The first packaging layer extends from the isolation opening to the side, away from the substrate, of the second isolation layer along the side wall of the isolation structure and covers the first protrusion, by means of the scheme, the packaging effect can be improved, and the production cost can be reduced.

Description

Technical Field

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

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

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

[0004] The main technical problem solved by the present application is to provide a display panel and a preparation method thereof, and a display device, which can improve the packaging effect and reduce the production cost.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a display panel, including a substrate, an isolation structure and a first encapsulation layer, the isolation structure being arranged on one side of the substrate, the isolation structure defining an isolation opening, the isolation structure including a first isolation layer and a second isolation layer stacked in sequence in a direction away from the substrate, the orthographic projection of the first isolation layer on the substrate being located within the orthographic projection of the second isolation layer on the substrate; the isolation structure also includes a first protrusion, the first protrusion being protruding on a side of the second isolation layer facing the substrate; the first encapsulation layer extends from the isolation opening along the side wall of the isolation structure to the side of the second isolation layer away from the substrate and covers the first protrusion.

[0006] Preferably, the first protrusion and the second isolation layer are integrally formed.

[0007] Preferably, there are multiple first protrusions, each of which is arranged at an edge of the second isolation layer close to the isolation opening; one first protrusion is arranged around one isolation opening, or one first protrusion is arranged around part of the isolation opening.

[0008] Preferably, the isolation structure further comprises: a third isolation layer, which is arranged on a side of the first isolation layer away from the second isolation layer, and the orthographic projection of the first isolation layer on the substrate is located within the orthographic projection of the third isolation layer on the substrate.

[0009] Preferably, the material of the first isolation layer includes aluminum.

[0010] Preferably, the material of the second isolation layer includes titanium.

[0011] Preferably, the material of the third isolation layer includes molybdenum.

[0012] Preferably, a side surface of the first protrusion facing away from the first isolation layer is flush with a side surface of the second isolation layer.

[0013] Preferably, the first protrusion is protruded in a direction perpendicular to the substrate, the first protrusion is protruded in a direction away from the side wall of the second isolation layer, or the first protrusion is protruded in a direction close to the side wall of the second isolation layer.

[0014] Preferably, the angle between the protruding direction of the first protrusion and the substrate is in the range of 45°-90°.

[0015] Preferably, in a direction perpendicular to the substrate, a height of the first protrusion is less than or equal to one quarter of a thickness of the second isolation layer in the direction perpendicular to the substrate.

[0016] Preferably, the isolation structure further comprises: a second protrusion, which is protruding on a surface of the second isolation layer facing away from the substrate; and the first encapsulation layer also covers the second protrusion.

[0017] Preferably, there are multiple second protrusions, each of which is arranged at an edge of the second isolation layer close to the isolation opening; one second protrusion is arranged around one isolation opening, or one second protrusion is arranged around part of the isolation opening.

[0018] Preferably, the second protrusion and the second isolation layer are integrally formed.

[0019] Preferably, the first protrusion, the second protrusion and the second isolation layer are integrally formed.

[0020] Preferably, the second protrusion is arranged at an edge position of the second isolation layer.

[0021] Preferably, a side surface of the second protrusion facing away from the first isolation layer is arranged flush with a side surface of the second isolation layer.

[0022] Preferably, a side of the first protrusion facing away from the first isolation layer, a side of the second isolation layer, and a side of the second protrusion facing away from the first isolation layer are arranged flush.

[0023] Preferably, the second protrusion is protruded in a direction perpendicular to the substrate, the second protrusion is protruded in a direction away from the side wall of the first isolation layer, or the second protrusion is protruded in a direction close to the side wall of the first isolation layer.

[0024] Preferably, the angle between the protruding direction of the second protrusion and the substrate is in the range of 45°-90°.

[0025] Preferably, in a direction perpendicular to the substrate, a height of the second protrusion is less than or equal to one quarter of a thickness of the second isolation layer in the direction perpendicular to the substrate.

[0026] Preferably, the protruding directions of the first protrusion and the second protrusion are the same straight line direction.

[0027] In order to solve the above technical problem, another technical solution adopted in the present application is: a display device, comprising the display panel described in any embodiment.

[0028] In order to solve the above technical problems, another technical solution adopted in the present application is: a method for preparing a display panel, the method comprising: forming an isolation structure on one side of a substrate, wherein an isolation opening is arranged on the isolation structure, the isolation structure comprises a first isolation layer and a second isolation layer which are stacked in sequence in a direction away from the substrate, the orthographic projection of the first isolation layer on the substrate is located within the orthographic projection of the second isolation layer on the substrate; the isolation structure also comprises a first protrusion, the first protrusion is protruding on the side of the second isolation layer facing the substrate; a light-emitting unit is formed in the isolation opening; a first encapsulation layer is formed on the side of the light-emitting unit away from the substrate, wherein the first encapsulation layer extends from the isolation opening along the side wall of the isolation structure to the side of the second isolation layer away from the substrate and covers the first protrusion.

[0029] Preferably, the step of forming an isolation structure on one side of the substrate includes: forming the first isolation layer on one side of the substrate, the first isolation layer being provided with a first opening; forming an intermediate layer in the first opening, wherein a surface of the intermediate layer facing away from the substrate is flush with a surface of the first isolation layer facing away from the substrate; forming a groove on a surface of the intermediate layer facing away from the substrate; forming the second isolation layer on the intermediate layer and on a side of the first isolation layer facing away from the substrate, wherein the orthographic projection of the second isolation layer on the substrate covers the first isolation layer and the second isolation layer fills the groove, the second isolation layer has a second opening, the second opening is connected to the first opening, and the isolation opening includes the first opening and the second opening; and removing the intermediate layer.

[0030] Preferably, the material of the intermediate layer includes inorganic material or organic glue.

[0031] Preferably, before the step of removing the intermediate layer, the method further comprises: patterning the second isolation layer so that a second protrusion is formed on a surface of the second isolation layer facing away from the substrate.

[0032] The beneficial effects of the present application are as follows: Different from the prior art, the display panel provided by the present application has a first protrusion protruding from the bottom of the outer periphery of the second isolation layer, the first protrusion shortens the distance between the isolation structure and the surface of the second electrode layer in the second direction, and the first encapsulation layer only needs to be of a relatively small thickness to connect the first encapsulation layer attached to the lower surface of the first protrusion and the first encapsulation layer attached to the upper surface of the second electrode layer, thereby sealing the gap, thereby avoiding residual liquid medicine in the gap, thereby reducing the probability of liquid medicine corroding the first encapsulation layer, ensuring the encapsulation effect of the first encapsulation layer, and improving the reliability of the display panel. At the same time, the required thickness of the first encapsulation layer is reduced, thereby reducing the required materials and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic top view of an embodiment of a display panel of the present application;

[0034] Figure 2 yes Figure 1 Schematic cross-sectional view along the AA direction;

[0035] Figure 3 is a schematic structural diagram of another embodiment of a display panel of the present application;

[0036] Figure 4 is a structural schematic diagram of another implementation of the isolation structure of the present application;

[0037] Figure 5 It is a structural schematic diagram of another implementation mode of the isolation structure of the present application;

[0038] Figure 6 is a schematic structural diagram of another embodiment of a display panel of the present application;

[0039] Figure 7 It is a structural schematic diagram of another implementation mode of the isolation structure of the present application;

[0040] Figure 8 It is a structural schematic diagram of another implementation mode of the isolation structure of the present application;

[0041] Fig. 9 It is a schematic diagram of a process of an embodiment of a method for manufacturing a display panel of the present application;

[0042] Figure 10a-10hIt is a structural schematic diagram of each step of the method for preparing a display panel of the present application;

[0043] Fig.11 yes Fig. 9 FIG. 5 is a flow chart of an implementation method of step S110 in FIG. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail with reference to the accompanying drawings and examples. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0045] In order to reduce the cost brought by fine masks in the related art, an isolation structure is set in the gap between the light-emitting devices to separate the functional film layers (such as electrode layers and light-emitting material layers, etc.) in adjacent light-emitting devices, so that the corresponding functional film layers can be formed in the area where the light-emitting devices are located through full-surface evaporation and etching.

[0046] The functional film layer is usually covered with a first encapsulation layer, and the first encapsulation layer is prone to form a gap on the surface of the isolation structure. The inventors found that in the process of etching the functional film layer, the etching solution is likely to remain in the gap, causing the first encapsulation layer to be corroded, affecting the encapsulation effect. In order to solve the above problem, the related technology usually closes the gap by thickening the first encapsulation layer. This method will greatly increase the amount of material used in the first encapsulation layer and increase production costs.

[0047] See also Figure 1 and Figure 2 , Figure 1 is a schematic top view of an embodiment of a display panel of the present application, Figure 2 yes Figure 1A schematic cross-sectional view along the AA direction. The display panel 10 includes a substrate 11, an isolation structure 12 and a first encapsulation layer 13. The isolation structure 12 is disposed on one side of the substrate 11, and the isolation structure 12 defines an isolation opening 120. The isolation structure 12 includes a first isolation layer 121 and a second isolation layer 122 which are sequentially stacked in a direction away from the substrate 11, and the orthographic projection of the first isolation layer 121 on the substrate 11 is located within the orthographic projection of the second isolation layer 122 on the substrate 11. The composition, preparation, etc. of the isolation structure 12 are described in patents CN118251982A, 202410864269.8, PCT / CN2024 / 098407, PCT / CN2024 / 102783, PCT / CN2024 / 098217, PCT / CN2024 / 099419, PCT / CN2024 / 099072, and CN117979 755A, CN117998900A, CN117062489A, CN117580403A, CN116583155A, CN116669477A, ​​CN117396039A, CN116669480A, CN116600606A, CN117500332A, the contents of which are incorporated herein by reference for reference.

[0048] The isolation structure 12 further includes a first protrusion 124 which is protruded from the side of the second isolation layer 122 facing the substrate 11 . The first encapsulation layer 13 extends from the isolation opening 120 along the surface of the isolation structure 12 to the side of the second isolation layer 122 away from the substrate 11 and covers the first protrusion 124 .

[0049] Specifically, in a direction parallel to the substrate 11, the isolation structure 12 extends in a mesh shape on the substrate 11, and the isolation structure 12 defines a plurality of isolation openings 120, that is, the mesh holes of the mesh structure are the isolation openings 120, and the first electrode layer 14, the light-emitting layer 15, and the second electrode layer 16 are stacked in sequence on the side of the substrate 11 facing the isolation structure 12. In some embodiments, the first electrode layer 14 may be an anode, and the second electrode layer 16 may be a cathode, wherein the first electrode layer 14 and the light-emitting layer 15 are located in the isolation openings 120, and the second electrode layer 16 may be located in the isolation openings 120, or may extend to a portion of the side of the first isolation layer 121. A pixel definition layer 17 is also provided between the substrate 11 and the isolation structure 12, extending to a portion of the first electrode layer 14 facing away from the substrate 11. The first packaging layer 13 is arranged on the side of the second electrode layer 16 facing away from the substrate 11 and on part of the side wall of the isolation structure 12, that is, the first packaging layer 13 starts from the surface of the second electrode layer 16, and extends in sequence along the side of the first isolation layer 121, the lower surface of the second isolation layer 122 facing the substrate 11, and the outer surface of the first protrusion 124, and finally extends to the upper surface of the second isolation layer 122 facing away from the substrate 11.

[0050] Since the first isolation layer 121 is retracted relative to the second isolation layer 122 at least in the first direction X, the vapor-deposited film layer (the light-emitting layer 15 and the second electrode layer 16) is separated, and a gap 12a is formed on both sides of the isolation structure 12 along the first direction X. When the first encapsulation layer 13 is deposited, the first encapsulation layer 13 grows along the surface of the isolation structure 12 and the surface of the second electrode layer 16. Since the first protrusion 124 is protruding from the bottom of the outer periphery of the second isolation layer 122 in the present application, the first protrusion 124 shortens the distance between the isolation structure 12 and the second electrode layer 16 surface in the second direction Z (perpendicular to the substrate 11). The first encapsulation layer 13 only needs to be of a relatively small thickness to connect the first encapsulation layer 13 attached to the lower surface of the first protrusion 124 and the first encapsulation layer 13 attached to the upper surface of the second electrode layer 16 together, thereby sealing the gap 12a, thereby avoiding residual liquid medicine in the gap 12a, thereby reducing the probability of the liquid medicine corroding the first encapsulation layer 13, ensuring the encapsulation effect of the first encapsulation layer 13, and improving the reliability of the display panel. At the same time, the required thickness of the first encapsulation layer 13 is reduced, thereby reducing the required materials and reducing the production cost.

[0051] It should be noted that the first encapsulation layer 13 in the gap 12a does not need to completely fill the gap 12a. Figure 1 As shown, the first packaging layer 13 forms a closed chamber 13a on the surface of the isolation structure 12. Since the chamber 13a is surrounded and closed by the first packaging layer 13, even if the notch 12a has the chamber 13a, external drug solution is not easy to invade.

[0052] Optionally, continue to Figure 1 In some embodiments, the first protrusion 124 is integrally formed with the second isolation layer 122. The connection between the first protrusion 124 and the second isolation layer 122 is more stable, and the preparation method is relatively simple. Specifically, the materials of the second isolation layer 122 and the first protrusion 124 are both titanium. Optionally, there are multiple first protrusions 124, and each first protrusion 124 is arranged at the edge of the second isolation layer 122 close to the isolation opening 120, so that the gap 12a can be completely sealed by the first encapsulation layer 13. A first protrusion 124 is arranged around an isolation opening 120. The first protrusion 124 enables the edge of an isolation structure 12 close to the isolation opening 120 to be sealed by the first encapsulation layer 13, further improving the encapsulation effect. In other embodiments, a first protrusion 124 is arranged around part of the isolation opening 120.

[0053] Optionally, continue to Figure 1In some embodiments, the isolation structure 12 further includes: a third isolation layer 123, which is disposed on the side of the first isolation layer 121 away from the second isolation layer 122, and the orthographic projection of the first isolation layer 121 on the substrate 11 is located within the orthographic projection of the third isolation layer 123 on the substrate 11, that is, the first isolation layer 121 is retracted relative to the third isolation layer 123. Specifically, the material of the first isolation layer 121 includes aluminum; the material of the third isolation layer 123 includes molybdenum. In one embodiment, the material of the first isolation layer 121 includes aluminum, the material of the second isolation layer 122 includes aluminum, and the material of the third isolation layer 123 includes molybdenum. At this time, the combination of molybdenum-aluminum-titanium can ensure that the isolation structure 12 has a minimum transmission impedance.

[0054] Optionally, continue to Figure 1 In some embodiments, the side of the first protrusion 124 facing away from the first isolation layer 121 is flush with the side of the second isolation layer 122. In other embodiments, the side of the first protrusion 124 facing away from the first isolation layer 121 may be located inside the side of the second isolation layer 122.

[0055] Optionally, continue to Figure 1 In some embodiments, the first protrusion 124 is spaced apart from the first isolation layer 121. This embodiment requires less material for the first protrusion 124 and has a lower cost.

[0056] Alternatively, see Figure 3 , Figure 3 1 is a schematic diagram of the structure of another embodiment of the display panel of the present application. In some embodiments, the first protrusion 124 extends to the outside of the first isolation layer 121, which can reduce the volume of the gap 12a, so that the gap 12a is more easily sealed by the first encapsulation layer 13, thereby ensuring the encapsulation effect. In this embodiment, the first encapsulation layer 13 completely fills the gap 12a.

[0057] Optionally, the first protrusion 124 is protruded in a direction perpendicular to the substrate 11, the first protrusion 124 is protruded in a direction away from the side wall of the second isolation layer 122, or the first protrusion 124 is protruded in a direction close to the side wall of the second isolation layer 122. Specifically, the angle between the protruding direction of the first protrusion 124 and the substrate 11 is in the range of 45°-90°. From another perspective, the first dihedral angle θ1 formed between the side of the first protrusion 124 facing away from the first isolation layer 121 and the surface of the second isolation layer 122 facing the substrate 11 is a right angle (such as Figure 2-Figure 3 As shown), obtuse angle (as Figure 4 as shown) or acute angles (as Figure 5); specifically, the first dihedral angle θ1 is in the range of 45°-135° (e.g., 60°, 90°, 120°, etc.). Specifically, the protrusion height h1 of the first protrusion 124 in the second direction Z is less than or equal to one quarter of the thickness h2 of the second isolation layer 122 in the second direction Z. Avoid the protrusion height h1 of the first protrusion 124 being too high and the distance to the first isolation layer 121 being too close, thereby avoiding affecting the isolation effect of the isolation structure 12. Figure 4 The illustrated embodiment can increase the width of the isolation structure 12 in the first direction X to ensure the isolation effect. Figure 5 The first protrusion 124 in the illustrated embodiment avoids inward, so that when the second electrode layer 16 is evaporated, the second electrode layer 16 can climb along the outer side of the first protrusion 124 to part of the side wall of the first isolation layer 121, thereby increasing the area of ​​the second electrode layer 16, reducing the impedance of the second electrode layer 16, and ensuring the display effect.

[0058] During the preparation of the display panel 10, the second electrode layer 16 is evaporated onto the upper surface of the second isolation layer 122, and the first encapsulation layer 13 is located on the side of the second electrode layer 16 away from the second isolation layer 122. The inventors have found that when the etching solution remains on the second isolation layer 122, the second electrode layer 16 between the first encapsulation layer 13 and the second isolation layer 122 is easily corroded by the solution, forming a gap between the first encapsulation layer 13 and the second isolation layer 122, and the solution will corrode the first encapsulation layer 13 along the gap and flow downward along the gap between the first encapsulation layer 13 and the isolation structure 12 to corrode the first isolation layer 121 to form a cavity, resulting in a dark spot. At the same time, in the process of forming the second electrode layer 16 and other film layers, it is necessary to use a wind knife to blow away impurities and the like. When the wind knife blows toward the isolation structure 12, due to the gap between the first packaging layer 13 and the second isolation layer 122, the wind knife enters the gap and easily overturns the first packaging layer 13, causing the first packaging layer 13 to break and break at the edge of the second isolation layer 122, thereby causing dark spots.

[0059] Optionally, in this regard, see Figure 6 , Figure 6 It is a structural schematic diagram of another embodiment of the display panel of the present application. In some embodiments, the isolation structure 12 also includes: a second protrusion 125, which is convexly arranged on the surface of the second isolation layer 122 facing away from the substrate 11. The first encapsulation layer 13 also covers the second protrusion 125. That is, the second protrusion 125 is convexly arranged on the upper surface of the second isolation layer 122. The second protrusion 125 can block at least part of the liquid medicine from flowing downward to between the first isolation layer 121 and the first encapsulation layer 13, thereby improving the corrosion problem of the first isolation layer 121. At the same time, the second protrusion 125 can also block part of the wind knife and improve the fracture and breakage problem of the first encapsulation layer 13.

[0060] Optionally, continue to Figure 6In some embodiments, the number of the second protrusions 125 is multiple, and each second protrusion 125 is arranged at the edge of the second isolation layer 122 near the isolation opening 120; one second protrusion 125 is arranged around one isolation opening 120, and one second protrusion 125 is arranged around part of the isolation opening 120. Optionally, the orthographic projection of the first protrusion 125 on the substrate 11 coincides with the orthographic projection of the second protrusion 125 on the substrate 11. The edges on both sides of an isolation structure 12 can be blocked by the second protrusions 125 to prevent the liquid from overflowing, further improving the corrosion problem, and at the same time, both sides of the first encapsulation layer 13 are not easily overturned by the wind knife. In other embodiments, one second protrusion 125 is arranged around part of the isolation opening 120.

[0061] Optionally, the second protrusion 125 and the second isolation layer 122 are integrally formed; further, the first protrusion 124 , the second protrusion 125 and the second isolation layer 122 are integrally formed, which can ensure the overall strength of the isolation structure 12 .

[0062] Optionally, continue to Figure 6 In some embodiments, the second protrusion 125 is arranged at the edge of the second isolation layer 122, and this arrangement has a better effect of preventing the liquid from overflowing. Optionally, the side of the second protrusion 125 facing away from the first isolation layer 121 is flush with the side of the second isolation layer 122. Furthermore, the side of the first protrusion 124 facing away from the first isolation layer 121, the side of the second isolation layer 122, and the side of the second protrusion 125 facing away from the first isolation layer 121 are flush. The above arrangement allows the first encapsulation layer 13 on the side of the isolation portion 1201 to extend smoothly, ensure the encapsulation effect, and facilitate preparation.

[0063] Optionally, in some embodiments, the second protrusion 125 is protruded in a direction perpendicular to the substrate 11, the second protrusion 125 is protruded in a direction away from the side wall of the second isolation layer 122, or the second protrusion 125 is protruded in a direction close to the side wall of the second isolation layer 122. Specifically, the angle between the protruding direction of the second protrusion 125 and the substrate 11 is in the range of 45°-90°. From another aspect, the second dihedral angle θ2 formed between the side of the second protrusion 125 facing away from the first isolation layer 121 and the surface of the second isolation layer 122 facing the substrate 11 is a right angle (such as Figure 6 As shown), obtuse angle (as Figure 7 as shown) or acute angles (as Figure 8Specifically, the second dihedral angle θ2 formed between the side of the second protrusion 125 facing away from the first isolation layer 121 and the surface of the second isolation layer 122 facing the substrate 11 is in the range of 45°-135° (e.g., 60°, 90°, 120°, etc.). In the second direction Z, the height h3 of the second protrusion 125 is less than or equal to one quarter of the thickness h2 of the second isolation layer 122 in the second direction Z, so as to ensure the strength of the second protrusion 125. Figure 7 The illustrated embodiment can further reduce the probability of liquid medicine overflowing. Figure 8 In the embodiment shown, the width of the isolation structure 12 in the first direction X is increased to ensure the isolation effect. Figure 6-Figure 8 As shown, the protruding directions of the first protrusion 124 and the second protrusion 125 are in the same straight line direction, which is convenient for preparation.

[0064] The present application also provides a display device, including the display panel 10 in any of the above embodiments. The display device with the above display panel 10 has better uniformity of luminous brightness and better luminous effect. The display device can be a mobile phone, a tablet computer, a wearable smart device, etc.

[0065] See also Fig. 9 Combined with Figure 10a-10h , Fig. 9 is a schematic diagram of a process of an embodiment of a method for preparing a display panel of the present application, Figure 10a-10h 1 is a schematic diagram of the structure of each step of the method for preparing a display panel of the present application. The method comprises:

[0066] Step S110: An isolation structure 12 is formed on one side of the substrate 11, wherein an isolation opening 120 is set on the isolation structure 12, and the isolation structure 12 includes a first isolation layer 121 and a second isolation layer 122 which are stacked in sequence in a direction away from the substrate 11, and the orthographic projection of the first isolation layer 121 on the substrate 11 is located within the orthographic projection of the second isolation layer 122 on the substrate 11; the isolation structure 12 also includes a first protrusion 124, which is protruding on the side of the second isolation layer 122 facing the substrate 11 and is located at the periphery of the second isolation layer 122.

[0067] Step S120 : forming a light-emitting unit in the isolation opening 120 . This step specifically includes sequentially forming a first electrode layer 14 , a light-emitting layer 15 , and a second electrode layer 16 in the isolation opening 120 .

[0068] Step S130 : forming a first encapsulation layer 13 on the side of the light emitting unit away from the substrate, wherein the first encapsulation layer 13 extends from the isolation opening 120 along the sidewall of the isolation portion 1201 to the side of the second isolation layer 122 away from the substrate 11 and covers the first protrusion 124 .

[0069] Optionally, see Fig.11 Combined with Figure 10a-10g , Fig.11 1 is a flow chart of an implementation method of step S110 of the present application. Step S110 specifically includes:

[0070] Step S111: See Fig.10a , a first isolation layer 121 is formed on one side of the substrate 11, wherein a first opening 121a is provided on the first isolation layer 121. Optionally, in this step, a pixel definition layer 17 and a third isolation layer 123 may be formed sequentially on one side of the substrate 11, or only the pixel definition layer 17 may be formed, and then the first isolation layer 121 is formed on the side of the pixel definition layer 17 away from the substrate 11.

[0071] Step S112: forming an intermediate layer 18 in the first opening 121a, wherein the surface of the intermediate layer 18 facing away from the substrate 11 is flush with the surface of the first isolation layer 121 facing away from the substrate 11. Specifically, in this step, a whole intermediate film layer 180 may be formed first, such as Fig.10b As shown, a portion of the intermediate film layer 180 located on the side of the first isolation layer 121 away from the substrate 11 is then removed to form an intermediate layer 18, as shown in FIG. Fig.10c shown.

[0072] Step S113: forming a groove 181 on the surface of the intermediate layer 18 facing away from the substrate 11, such as Fig.10d As shown. Specifically, the groove 181 can be arranged on both sides of the first isolation layer 121 along the first direction X. The depth direction of the groove 181 can extend along the second direction Z, or form an angle with the second direction Z. The depth of the groove 181 should be less than or equal to one quarter of the thickness of the second isolation layer 122 formed subsequently. The shape of the groove 181 can be a rectangular groove, or other shapes such as a trapezoid.

[0073] Step S114: forming a second isolation layer 122 on the side of the intermediate layer 18 and the first isolation layer 121 away from the substrate 11, wherein the orthographic projection of the second isolation layer 122 on the substrate 11 covers the first isolation layer 121 and the second isolation layer 122 fills the groove 181, and the second isolation layer 122 has a second opening 122a, the second opening 122a is connected to the first opening 121a, and the isolation opening 120 includes the first opening 121a and the second opening 122a. Specifically, a whole second isolation film layer 1220 can be formed on the side of the intermediate layer 18 and the first isolation layer 121 away from the substrate 11, and the part of the second isolation film layer 1220 filling the groove 181 forms the first protrusion 124, as shown in FIG. 10e, and then the second isolation film layer 1220 is etched to form the second opening 122a, and the surrounding second isolation film layer 1220 is removed to form the second isolation layer 122, as shown in FIG. Fig.10f shown.

[0074] Step S115: removing the intermediate layer 18, such as Figure 10g As shown, specifically, the material of the intermediate layer 18 can be an inorganic material, for example, the same as the material of the first encapsulation layer 13, which is removed by etching; or an organic glue, which is removed by exposure and development.

[0075] Optionally, before step S115, the method further includes: patterning the second isolation layer 122 so that a second protrusion 125 is formed on the surface of the second isolation layer 122 facing away from the substrate 11. Fig.10h As shown, in Fig.10e After the surrounding second isolation film layer 1220 is removed, a portion of the second isolation film layer 1220 on the top of the second isolation film layer 1220 is removed, thereby forming an integrated second isolation layer 122, a first protrusion 124, and a second protrusion 125. In this step, the position, number, and shape of the second protrusion 125 are not specifically limited in this application, and the details can be referred to above.

[0076] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display panel, characterized in that: The display panel comprises: substrate; an isolation structure, arranged on one side of the substrate, the isolation structure defining an isolation opening, the isolation structure comprising a first isolation layer and a second isolation layer stacked in sequence in a direction away from the substrate, the orthographic projection of the first isolation layer on the substrate being located within the orthographic projection of the second isolation layer on the substrate; the isolation structure further comprising a first protrusion, the first protrusion being protruding on a side of the second isolation layer facing the substrate; The first packaging layer extends from the isolation opening along the sidewall of the isolation structure to a side of the second isolation layer away from the substrate and covers the first protrusion.

2. The display panel according to claim 1, characterized in that: The first protrusion and the second isolation layer are integrally formed; Preferably, there are multiple first protrusions, and each first protrusion is arranged at an edge of the second isolation layer close to the isolation opening; One of the first protrusions is disposed around one of the isolation openings, or one of the first protrusions is disposed around part of the isolation opening. Preferably, the isolation structure further comprises: a third isolation layer, which is arranged on a side of the first isolation layer away from the second isolation layer, and the orthographic projection of the first isolation layer on the substrate is located within the orthographic projection of the third isolation layer on the substrate; Preferably, the material of the first isolation layer includes aluminum; Preferably, the material of the second isolation layer includes titanium; Preferably, the material of the third isolation layer includes molybdenum.

3. The display panel according to claim 1, characterized in that: The side surface of the first protrusion facing away from the first isolation layer is arranged flush with the side surface of the second isolation layer.

4. The display panel according to claim 1, characterized in that: The first protrusion is protruded in a direction perpendicular to the substrate, the first protrusion is protruded in a direction away from the side wall of the second isolation layer, or the first protrusion is protruded in a direction close to the side wall of the second isolation layer; Preferably, the angle between the protruding direction of the first protrusion and the substrate is in the range of 45°-90°; Preferably, in a direction perpendicular to the substrate, a height of the first protrusion is less than or equal to one quarter of a thickness of the second isolation layer in the direction perpendicular to the substrate.

5. The display panel according to claim 1, characterized in that: The isolation structure also includes: a second protrusion, protruding on a surface of the second isolation layer facing away from the substrate; The first encapsulation layer also covers the second protrusion; Preferably, there are multiple second protrusions, and each second protrusion is arranged at an edge of the second isolation layer close to the isolation opening; One of the second protrusions is arranged around one of the isolation openings, or one of the second protrusions is arranged around part of the isolation opening; Preferably, the orthographic projection of the first protrusion on the substrate coincides with the orthographic projection of the second protrusion on the substrate; Preferably, the second protrusion and the second isolation layer are integrally formed; Preferably, the first protrusion, the second protrusion and the second isolation layer are integrally formed.

6. The display panel according to claim 5, characterized in that: The second protrusion is arranged at an edge position of the second isolation layer; Preferably, the side of the second protrusion facing away from the first isolation layer is flush with the side of the second isolation layer; Preferably, a side of the first protrusion facing away from the first isolation layer, a side of the second isolation layer, and a side of the second protrusion facing away from the first isolation layer are arranged flush.

7. The display panel according to claim 5, characterized in that: The second protrusion is protruded in a direction perpendicular to the substrate, the second protrusion is protruded in a direction away from the side wall of the first isolation layer, or the second protrusion is protruded in a direction close to the side wall of the first isolation layer; Preferably, the angle between the protruding direction of the second protrusion and the substrate is in the range of 45°-90°; Preferably, in a direction perpendicular to the substrate, a height of the second protrusion is less than or equal to one quarter of a thickness of the second isolation layer in a direction perpendicular to the substrate; Preferably, the protruding directions of the first protrusion and the second protrusion are the same straight line direction.

8. A display device, characterized in that: The invention comprises a display panel as claimed in any one of claims 1 to 7.

9. A method for preparing a display panel, characterized in that: The method comprises: An isolation structure is formed on one side of the substrate, wherein an isolation opening is provided on the isolation structure, the isolation structure comprises a first isolation layer and a second isolation layer which are sequentially stacked in a direction away from the substrate, and the orthographic projection of the first isolation layer on the substrate is located within the orthographic projection of the second isolation layer on the substrate; the isolation structure further comprises a first protrusion, and the first protrusion is protruded on a side of the second isolation layer facing the substrate; forming a light emitting unit in the isolation opening; A first encapsulation layer is formed on a side of the light emitting unit away from the substrate, wherein the first encapsulation layer extends from the isolation opening along the sidewall of the isolation structure to a side of the second isolation layer away from the substrate and covers the first protrusion.

10. The method according to claim 9, characterized in that The step of forming an isolation structure on one side of the substrate includes: forming the first isolation layer on one side of the substrate, wherein the first isolation layer is provided with a first opening; forming an intermediate layer in the first opening, wherein a surface of the intermediate layer facing away from the substrate is flush with a surface of the first isolation layer facing away from the substrate; forming a groove on a surface of the intermediate layer facing away from the substrate; forming a second isolation layer on the side of the intermediate layer and the first isolation layer facing away from the substrate, wherein the orthographic projection of the second isolation layer on the substrate covers the first isolation layer and the second isolation layer fills the groove, the second isolation layer has a second opening, the second opening is connected to the first opening, and the isolation opening includes the first opening and the second opening; removing the intermediate layer; Preferably, the material of the intermediate layer includes inorganic material or organic glue.

11. The method according to claim 10, characterized in that Before the step of removing the intermediate layer, the method further comprises: The second isolation layer is patterned so that a second protrusion is formed on a surface of the second isolation layer facing away from the substrate.

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