Display panel, manufacturing method and display device

Abstract

The invention provides a display panel, a manufacturing method and a display device.The display panel comprises a substrate and an isolation structure located on the substrate, the isolation structure comprises a first isolation part and a second isolation part located on the side, away from the substrate, of the first isolation part, and the surface of the side, away from the substrate, of the first isolation part is provided with at least one concave part; the second isolation part fills at least part of the concave part and covers one side, deviating from the substrate, of the first isolation part, and the orthographic projection of the first isolation part on the substrate is located on the orthographic projection of the second isolation part on the substrate. According to the invention, the first isolation part is provided with the recessed part, and the second isolation part fills part of the recessed part, so that the deformation quantity caused by thermal expansion and cold contraction of the first isolation part can be effectively improved, and gaps between the first isolation part and the first packaging layer and between the first isolation part and the cathode of the light-emitting unit are avoided. Therefore, the first packaging layer is tightly combined with the side wall of the isolation structure, and the cathode of the light-emitting unit is effectively lapped with the isolation structure.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display panel, a method for manufacturing the panel, and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) and flat panel displays based on light-emitting diode (LED) technologies are widely used in various consumer electronics products such as mobile phones, televisions, laptops, and desktop computers due to their advantages such as high image quality, energy saving, thin body, and wide range of applications, becoming the mainstream of display devices.

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

[0004] In view of this, the purpose of this disclosure is to provide a display panel, a manufacturing method and a display device, wherein the isolation structure of the display panel and the encapsulation effect of the first encapsulation layer are good.

[0005] For the purposes described above, this disclosure discloses a first aspect of providing a display panel, the display panel comprising:

[0006] substrate;

[0007] An isolation structure is located on the substrate. The isolation structure includes a second isolation portion and a first isolation portion. The second isolation portion is located on the side of the first isolation portion away from the substrate. The surface of the side of the first isolation portion away from the substrate is provided with at least one recess. The second isolation portion fills at least a portion of the recess and covers the side of the first isolation portion away from the substrate. The orthographic projection of the first isolation portion on the substrate is located within the orthographic projection of the second isolation portion on the substrate.

[0008] In one embodiment, the coefficient of thermal expansion of the second isolation portion is smaller than that of the first isolation portion;

[0009] Preferably, both the second isolation portion and the first isolation portion comprise a conductive material;

[0010] Preferably, both the first isolation portion and the second isolation portion are made of metallic material;

[0011] Preferably, the material of the second isolation portion includes titanium, and the material of the first isolation portion includes aluminum or copper.

[0012] In one embodiment, the recessed portion is recessed toward the substrate side, and the at least one recessed portion is spaced apart along a direction parallel to the surface of the substrate;

[0013] Preferably, the orthographic projection of the recessed portion on the substrate is located within the orthographic projection of the surface of the first isolation portion on the side opposite to the substrate on the substrate;

[0014] Preferably, in the direction perpendicular to the plane of the substrate, the cross-sectional shape of the recess is square, trapezoidal, or oblong.

[0015] In one embodiment, the second isolation portion includes a main body portion and a filling portion extending from the main body portion toward the substrate side, the filling portion filling at least a portion of the recessed portion, the main body portion being located on the side of the first isolation portion away from the substrate and protruding from the first isolation portion toward the isolation opening;

[0016] Preferably, the surface of the filling portion facing away from the substrate is flush with the surface of the first isolation portion facing away from the substrate;

[0017] Preferably, in the direction perpendicular to the surface of the substrate, the height of the filling portion is less than the height of the recessed portion;

[0018] Preferably, the main body and the filling part are an integral structure.

[0019] In one embodiment, in a direction perpendicular to the plane where the substrate is located, the depth of the recess is a first depth, the thickness of the first isolation portion is a first thickness, and the first depth is greater than or equal to one-half of the first thickness and less than or equal to two-thirds of the first thickness.

[0020] In the direction parallel to the surface of the substrate, the width of the recessed portion away from the substrate is a first width, and in the direction perpendicular to the surface of the substrate, the thickness of the main body of the second isolation portion is a second thickness. The first width is greater than or equal to one-third of the second thickness and less than or equal to one-half of the second thickness.

[0021] In one embodiment, the isolation structure encloses and forms a plurality of isolation openings;

[0022] Preferably, the isolation structure further includes a third isolation portion, which is located on the side of the first isolation portion closer to the substrate. The orthographic projection of the third isolation portion on the substrate is within the orthographic projection range of the second isolation portion on the substrate, and the orthographic projection of the first isolation portion on the substrate is within the orthographic projection range of the third isolation portion on the substrate.

[0023] Preferably, the material of the third isolation section includes molybdenum.

[0024] In one embodiment, the display panel further includes a plurality of light-emitting units, at least a portion of which are located within the isolation opening;

[0025] Preferably, the light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode stacked together. The first electrode is disposed on one side of the substrate, the light-emitting functional layer is located on the side of the first electrode facing away from the substrate, the second electrode is located on the side of the light-emitting functional layer facing away from the substrate, and the second electrode layer overlaps at least a portion of the sidewall of the isolation structure.

[0026] Preferably, the second electrode overlaps with the sidewall of the first isolation portion, and / or the second electrode overlaps with the sidewall of the third isolation portion.

[0027] In one embodiment, the display panel further includes:

[0028] A pixel defining layer is disposed on one side of the substrate, including a pixel defining portion and a plurality of pixel openings formed by the pixel defining portion, wherein the pixel openings are in communication with the corresponding isolation openings;

[0029] Preferably, the orthographic projection of the pixel opening on the substrate is located within the orthographic projection range of the isolation opening on the substrate;

[0030] Preferably, the pixel defining portion covers the gap between adjacent first electrodes and the edge of the first electrodes.

[0031] In one embodiment, the display panel further includes

[0032] The first encapsulation layer includes a plurality of encapsulation portions, each encapsulation portion being located on the side of the corresponding light-emitting unit facing away from the substrate, and extending from the sidewall of the isolation structure to the side of the isolation structure facing away from the substrate.

[0033] In one embodiment, the display panel further includes:

[0034] The second encapsulation layer is located on the side of the first encapsulation layer that is away from the substrate;

[0035] The third encapsulation layer is located on the side of the second encapsulation layer that is away from the substrate;

[0036] Preferably, the materials of the first encapsulation layer and the third encapsulation layer include inorganic materials, and the material of the second encapsulation layer includes organic materials.

[0037] The second aspect of this disclosure provides a method for manufacturing a display panel, the method comprising the following steps:

[0038] Provide substrate;

[0039] A first insulating material layer is formed on one side of the substrate.

[0040] The first insulating material layer is patterned to form at least one recess on the side surface of the first insulating material layer opposite to the substrate;

[0041] A second isolation material layer is formed on the side of the first isolation material layer away from the substrate, and the second isolation material layer fills at least a portion of the recess in a direction perpendicular to the surface of the substrate.

[0042] The first and second isolation material layers are patterned to form the first and second isolation portions of the isolation structure.

[0043] In one embodiment, the step of forming a first insulating material layer on one side of the substrate further includes:

[0044] A third insulating material layer is formed on the substrate;

[0045] Preferably, the step of patterning the first isolation material layer and the second isolation material layer further includes:

[0046] The first isolation material layer, the second isolation material layer, and the third isolation material layer are patterned to form a first isolation part, a second isolation part, and a third isolation part of an isolation structure, which encloses and forms a plurality of isolation openings.

[0047] In one embodiment, the step of graphically representing the first insulating material layer, the second insulating material, and the third insulating material layer further includes:

[0048] Multiple light-emitting units are formed within the multiple isolation openings;

[0049] Preferably, after the step of forming the plurality of light-emitting units located within the plurality of said isolation openings, the method further includes:

[0050] A first encapsulation layer is formed on the side of the light-emitting unit facing away from the substrate. The first encapsulation layer includes a plurality of encapsulation portions, each of which is located on the side of the corresponding light-emitting unit facing away from the substrate and extends from the sidewall of the isolation structure to the side of the isolation structure facing away from the substrate.

[0051] In one embodiment, the step of forming a third insulating material layer on the substrate further includes:

[0052] An insulating material layer is formed on the substrate;

[0053] Preferably, the step of forming the plurality of light-emitting units located within the plurality of said isolation openings further includes:

[0054] The insulating material layer is patterned to form pixel defining portions and pixel openings of the pixel defining layer.

[0055] A third aspect of this disclosure provides a display device comprising a display panel as described above, or a display panel manufactured by the above manufacturing method. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in this disclosure or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a partial cross-sectional schematic diagram of a display panel in the prior art;

[0058] Figure 2 A partial cross-sectional schematic diagram of the display panel provided in the first aspect of this disclosure;

[0059] Figure 3 for Figure 2 Enlarged schematic diagram of part B;

[0060] Figure 4 for Figure 2 A diagram illustrating the breakdown of section B;

[0061] Figure 5 A schematic diagram illustrating the manufacturing process of the display panel provided for the second aspect of this disclosure. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0063] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in the embodiments of this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0064] After the isolation structure 200 of the display panel in this disclosure is completed, the light-emitting unit 300 needs to be prepared. In the process of preparing the light-emitting unit 300, the light-emitting unit material and the first encapsulation layer material need to be deposited on the entire surface of the substrate 100. Before the step of depositing the light-emitting unit material and the encapsulation material, the substrate 100 to be vapor-deposited needs to be baked at high temperature. Since the material of the first isolation part 210 in the isolation structure 200 is mainly aluminum, and aluminum has a high coefficient of thermal expansion, after the high and low temperature process, the first isolation part 210 will cool and shrink, resulting in a gap between the sidewall of the first isolation part 210 and the first encapsulation layer 500 (as shown in part A in the figure). This phenomenon causes the first encapsulation layer film layer to have poor encapsulation effect. In subsequent processes, related failure factors will invade the encapsulated light-emitting unit film layer from the gap, thereby damaging the light-emitting material of the light-emitting unit 300 and causing the pixel to have dark spots.

[0065] For the reasons mentioned above, this application provides a display panel in which the first encapsulation layer and the isolation structure have a good encapsulation effect.

[0066] Next, combine Figures 2-4The first aspect of this application describes a display panel including a substrate 10 and an isolation structure 20. The isolation structure 20 is located on the substrate 10 and includes a first isolation portion 21 and a second isolation portion 22. The second isolation portion 22 is located on the side of the first isolation portion 21 away from the substrate 10. At least one recess 211 is provided on the surface of the side of the first isolation portion 21 away from the substrate 10. The second isolation portion 22 fills at least a portion of the recess 211 and covers the side of the first isolation portion 21 away from the substrate 10. The orthographic projection of the first isolation portion 21 on the substrate 10 is located within the orthographic projection of the second isolation portion 22 on the substrate 10. In this disclosure, by providing a recessed portion 211 in the first isolation portion 21 and filling part of the recessed portion 211 with the second isolation portion 22, the deformation caused by thermal expansion and contraction of the first isolation portion 21 can be effectively improved, and gaps can be avoided between the first isolation portion 21 and the first encapsulation layer 50 and the cathode of the light-emitting unit. This ensures that the first encapsulation layer 50 is tightly bonded to the sidewall of the isolation structure 20 and that the cathode of the light-emitting unit 30 is effectively connected to the isolation structure, thereby improving the encapsulation effect of the first encapsulation layer 50 and the isolation structure 20 and reducing the proportion of dark spot defects in the display panel.

[0067] The composition and preparation of the isolation structure 20 (or partition structure or isolation column) mentioned below are specified in patents CN118251982A, 202410864269.8, PCT / CN2024 / 098407, PCT / CN2024 / 102783, PCT / CN2024 / 098217, PCT / CN2024 / 099419, and PCT / CN2024 / Further descriptions are provided in CN117979755A, CN117998900A, CN117062489A, CN117580403A, CN116583155A, CN116669477A, ​​CN117396039A, CN116669480A, CN116600606A, and CN117500332A for reference.

[0068] In this disclosure, substrate 10 includes a substrate and an array layer. The substrate can be a rigid substrate or a flexible substrate. When the substrate is rigid, the substrate material can be glass or silicon wafer, etc. When the substrate is flexible, the substrate material can be polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyarylate, polyimide (PI), polycarbonate (PC), or cellulose acetate propionate (CAP), etc. The array layer includes multiple pixel driving circuits located in the display area, and the light-emitting unit 30 is electrically connected to the pixel driving circuit. For example, the pixel driving circuit may include multiple transistors (TFTs), capacitors, etc., and may be formed in various forms such as 2T1C (i.e., 2 transistors (TFTs) and 1 capacitor (C)), 3T1C, or 7T1C. The pixel driving circuit is connected to the light-emitting unit 30 to control the switching state and light emission brightness of the light-emitting unit 30. The array layer is generally composed of inorganic film layers such as metal layer, semiconductor layer (active layer), and insulating layer. By patterning these inorganic film layers, a driving circuit that controls the light emission of the light-emitting unit 30 can be formed. There are many ways to implement the specific circuit structure, which will not be described in detail here.

[0069] refer to Figures 2-4 The isolation structure 20 includes a second isolation portion 22 and a first isolation portion 21. The first isolation portion 21 has at least one recess 211 on its surface away from the substrate 10. The second isolation portion 22 is located on the side of the first isolation portion 21 away from the substrate 10 and fills at least a portion of the recess 211. The orthographic projection of the first isolation portion 21 on the substrate 10 is within the orthographic projection range of the second isolation portion 22 on the substrate 10. In this embodiment, by providing a recess 211 in the first isolation portion 21 and filling part of the recess 211 with the second isolation portion 22, the deformation caused by thermal expansion and contraction of the first isolation portion 21 can be effectively improved, and gaps can be avoided between the first isolation portion 21 and the first encapsulation layer 50 and the cathode of the light-emitting unit 30. This ensures that the first encapsulation layer 50 is tightly bonded to the sidewall of the isolation structure 20 and that the cathode of the light-emitting unit 30 is effectively connected to the isolation structure, thereby improving the encapsulation effect of the first encapsulation layer 50 and the isolation structure 20 and reducing the dark spot defect rate of the display panel.

[0070] refer to Figures 3-4In one specific embodiment, both the first isolation portion 21 and the second isolation portion 22 include conductive materials. Specifically, both the first isolation portion 21 and the second isolation portion 22 include metallic materials. The coefficient of thermal expansion of the second isolation portion 22 is less than that of the first isolation portion 21. This arrangement allows the deformation caused by the thermal expansion and contraction of the first isolation portion 21 to be significantly reduced during the manufacturing process of the light-emitting unit 30 of the display panel, even when switching between high and low temperatures. For example, during vapor deposition and baking, there is a strong metallic bonding force between the first isolation portion 21 and the second isolation portion 22, and the coefficient of thermal expansion of the second isolation portion 22 is smaller. Therefore, the second isolation portion 22 can reduce the amount of thermal expansion of the first isolation portion 21 towards the isolation opening 24. During low-temperature patterning, the second isolation portion 22 can prevent the first isolation portion 21 from cooling and shrinking, thereby significantly reducing the deformation of the first isolation portion 21 and further improving the encapsulation effect between the first encapsulation layer 50 and the first isolation portion 21, as well as the effective connection between the first isolation portion 21 and the first electrode (cathode) of the light-emitting unit. For example, the material of the first isolation portion 21 includes copper or aluminum, and the material of the second isolation portion 22 includes titanium.

[0071] refer to Figure 3 In one specific embodiment, the recessed portion 211 is recessed towards the substrate 10, and at least one recessed portion 211 is spaced apart along a direction parallel to the surface of the substrate 10 (x direction); and the orthographic projection of the recessed portion 211 on the substrate 10 is located within the orthographic projection of the side of the first isolation portion 21 away from the substrate 10 on the substrate 10, that is, the recessed portion 211 is only located on the surface of the first isolation portion 21 away from the substrate 10, and no recessed portion 211 is provided on the side wall of the first isolation portion 21 near the isolation opening 24. Furthermore, in the direction perpendicular to the surface of the substrate 10 (z direction), the cross-sectional shape of the recessed portion 211 is square, trapezoidal or oblong, and the oblong shape here can specifically be that the bottom and side wall of the recessed portion are both arc-shaped.

[0072] refer to Figure 4In one specific embodiment, in the direction perpendicular to the plane of the substrate 10 (z direction), the depth of the recess 211 is a first depth H1, and the thickness of the first isolation portion 21 is a first thickness H2. The first depth H1 is greater than or equal to half the first thickness H2 and less than or equal to two-thirds of the first thickness H2, i.e., 1 / 2H2≤H1≤2 / 3H2. In the direction parallel to the plane of the substrate 10 (x direction), the width of the recess 211 on the side away from the substrate 10 is a first width D1. In the direction perpendicular to the plane of the substrate 10 (z direction), the thickness of the main body 221 of the second isolation portion 22 is a second thickness H3. The first width D1 is greater than or equal to one-third of the second thickness H3 and less than or equal to half the second thickness H3, i.e., 1 / 3H3≤D1≤1 / 2H3. This design ensures that the second isolation portion 22 is a continuous whole, preventing it from breaking at the recess 211 during manufacturing and affecting the subsequent production of the display panel. Specifically, the second isolation portion 22, as described above, is a continuous whole, comprising a main body 221 and a filling portion 222 extending from the main body towards the substrate 10. The main body 221 and the filling portion 222 are an integral structure. The filling portion 222 fills at least a portion of the recess 211. The surface of the filling portion 222 facing away from the substrate 10 is flush with the surface of the first isolation portion 21 facing away from the substrate 10. The main body is located on the side of the first isolation portion 21 facing away from the substrate 10 and protrudes from the first isolation portion 21 towards the isolation opening 24. Due to the influence of the film layer structure, the filling portion 222 cannot completely fill the recess 211. Therefore, in the direction perpendicular to the surface of the substrate 10, the height H4 of the filling portion 222 is less than the depth H1 of the recess 211.

[0073] refer to Figures 2-4 The isolation structure 20 also includes a third isolation portion 23, which is located on the side of the first isolation portion 21 near the substrate 10. The orthographic projection of the third isolation portion 23 on the substrate 10 is within the orthographic projection range of the second isolation portion 22 on the substrate 10, and the orthographic projection of the first isolation portion 21 on the substrate 10 is within the orthographic projection range of the third isolation portion 23 on the substrate 10. This design is beneficial for the overlap between the cathode of the subsequent light-emitting unit 30 and the third isolation portion 23.

[0074] The display panel also includes multiple light-emitting units 30, at least a portion of which is located in a corresponding isolation opening 24. That is, multiple light-emitting units 30 are arranged one-to-one in the multiple isolation openings 24, thereby reducing crosstalk among charge carriers in each light-emitting unit 30 and improving the display effect of the display panel. Each light-emitting unit 30 may include a first electrode 31, a light-emitting functional layer 32, and a second electrode 33 stacked together. The first electrode 31 is disposed on one side of the substrate 10, the light-emitting functional layer 32 is located on the side of the first electrode 31 facing away from the substrate 10, and the second electrode 33 is located on the side of the light-emitting functional layer 32 facing away from the substrate 10, and contacts the sidewall of the isolation structure 20 facing the isolation opening 24, thus causing at least a portion of the second electrode 33 to overlap with the sidewall of the isolation structure 20. The orthographic projection of the light-emitting functional layer 32 of the light-emitting unit 30 onto the substrate 10 does not overlap with the orthographic projection of the third isolation portion 23 onto the substrate 10, and there is a certain gap between the light-emitting functional layer 32 and the third isolation portion 23. This design prevents crosstalk between the light-emitting units 30. The second electrode 33 fills the gap and overlaps with the sidewall 23 of the third isolation portion in the isolation structure 20. Alternatively, the second electrode 33 may not only overlap with the sidewall of the third isolation portion 23, but also extend to the first isolation portion 21 and contact and overlap with the sidewall of the first isolation portion 21, thereby realizing the electrical connection between the second electrodes 33 in the adjacent isolation openings 24 and further ensuring the stability of the electrical connection between the adjacent first electrodes 31. Of course, in some embodiments, the second electrode 33 may only overlap with the sidewall of the first isolation portion 21.

[0075] It should be noted that one of the first electrode 31 and the second electrode 33 can serve as the anode of the light-emitting unit 30 and the other as the cathode of the light-emitting unit 30. In the embodiment of this application, the second electrode 33 serves as the cathode of the light-emitting unit 30 and the first electrode 31 serves as the anode of the light-emitting unit 30. The light-emitting functional layer 32 can be formed by stacking various film layer structures. For example, the light-emitting functional layer 32 may include stacked film layers such as a hole injection layer (HIL), a hole transport layer (HTL), a light-emitting layer, an electron injection layer (EIL), and an electron transport layer (ETL).

[0076] Continue to refer to Figures 2-3The display panel also includes a pixel defining layer 40 located on the substrate 10. The pixel defining layer 40 includes a pixel defining portion 41 and a plurality of pixel openings 42 formed by the pixel defining portion 41. The pixel openings 42 are connected to the corresponding isolation openings 24. Further, the orthographic projection of the pixel openings 42 on the substrate 10 is located within the orthographic projection range of the isolation openings 24 on the substrate 10. For example, the pixel defining layer 40 includes an inorganic material. Since the chemical properties of inorganic materials are more stable, the pixel defining layer 40 in this embodiment can improve the stability of the display panel.

[0077] Continue to refer to Figures 2-3 The display panel also includes a first encapsulation layer 50, which includes a plurality of encapsulation portions 51. Each encapsulation portion 51 is located on the side of the corresponding light-emitting unit 30 facing away from the substrate 10 and extends from the sidewall of the isolation structure 20 to the side of the isolation structure 20 facing away from the substrate 10. The encapsulation layer can protect the light-emitting unit 30 from the influence of the external environment (such as air and water), prevent air and moisture from penetrating into the interior of the display panel, and extend its service life and stability. The encapsulation layer can also prevent impurities and harmful substances from entering the display panel, thereby ensuring the performance and quality of the display panel. For example, the material of the encapsulation portion 51 is an inorganic material, and the encapsulation portion 51 can be manufactured by chemical vapor deposition.

[0078] Continue to refer to Figure 2 The display panel also includes a second encapsulation layer 60 and a third encapsulation layer 70. The second encapsulation layer 60 is located on the side of the first encapsulation layer 50 facing away from the substrate 10, and this side includes a flat surface. The second encapsulation layer 60 can be fabricated using inkjet printing, and the third encapsulation layer 70 can be fabricated using chemical vapor deposition. The first encapsulation layer 50 and the third encapsulation layer 70 are inorganic encapsulation layers, and the second encapsulation layer 60 is an organic encapsulation layer. The first encapsulation layer 50, the second encapsulation layer 60, and the third encapsulation layer 70 form a thin-film encapsulation structure for the display panel. Thus, multi-layer encapsulation is achieved through the first encapsulation layer 50, the second encapsulation layer 60, and the third encapsulation layer 70, further improving encapsulation performance and the reliability of the display panel. The stacked arrangement of inorganic and organic layers provides protection for the display panel. Inorganic materials generally have good density and can isolate water vapor and oxygen, while organic materials have flexible properties. Using organic materials as a second encapsulation layer 60 can buffer stress from the outside world, prevent the display panel from being affected by external stress, and at the same time reduce the risk of encapsulation failure caused by the breakage of the inorganic layer.

[0079] It is understood that the display panel may also include a touch function layer, an optical adhesive layer, a polarizer and a cover plate, etc., which are stacked sequentially on the side of the third encapsulation layer 70 away from the substrate 10. The above-mentioned film layers are conventional film layers of the display panel, and will not be described in detail here.

[0080] Next, combine Figure 5 To describe the manufacturing method of the display panel provided in the second aspect of this disclosure, the manufacturing method includes the following steps:

[0081] Step S10: Prepare substrate 10 by forming a substrate 10 containing multiple thin-film transistors and signal traces through an array process.

[0082] Step S20: Prepare a plurality of first electrodes 31 on one side of the substrate 10: deposit at least one layer of conductive material on the surface of the substrate 10 and pattern the first conductive material to form a plurality of first electrodes 31.

[0083] Step S30: Prepare a pixel defining layer 40 on one side of the substrate 10: Deposit an insulating material layer covering the first electrode 31 layer on a layer of the substrate 10. It should be noted that the insulating material layer here is specifically used to prepare the pixel defining layer 40.

[0084] Step S40: Prepare an isolation structure 20 on one side of the pixel defining layer 40: Deposit a third isolation material layer and a first isolation material layer on the surface of the insulating material layer away from the substrate 10, wherein the first isolation material layer is located on the side of the third isolation material layer away from the substrate 10. Pattern the first isolation material layer to form at least one recess 211 on the surface of the first isolation material layer away from the substrate 10. Deposit a second isolation material layer on the patterned first isolation material layer away from the substrate 10. In a direction perpendicular to the surface of the substrate 10 (specifically, the depth direction of the recess), the second isolation material layer fills at least a portion of the recess 211. Pattern the second isolation material layer, the first isolation material layer, and the third isolation material layer to form a second isolation portion 22, a first isolation portion 21, and a third isolation portion 23 of the isolation structure 20. The isolation structure 20 defines a plurality of such portions.

[0085] Step S50: Pattern the insulating material layer to form the pixel defining portion 41 and pixel opening 42 in the pixel defining layer 40;

[0086] Step S60: Prepare a light-emitting unit material layer and a packaging material layer in the isolation opening 24 to form a plurality of light-emitting units 30 and a first packaging layer 50, wherein the first packaging layer 50 includes a plurality of packaging portions 51, the packaging portions 51 are located on the side of the corresponding light-emitting unit 30 away from the substrate 10, and extend along the side wall of the isolation mechanism to the side of the isolation structure 20 away from the substrate 10.

[0087] Step S70: A second encapsulation layer 60 and a third encapsulation layer 70 are sequentially formed on the side of the first encapsulation layer 50 away from the substrate 10.

[0088] This disclosure provides a display device in a third aspect. The display device includes the display panel described in any of the above embodiments. The display device can be a mobile phone as shown in the figures, or it can be a computer, television, smart wearable display device, etc. The embodiments of this invention do not impose any special limitations on this. The beneficial effects of the display device are the same as those of the display panel, and will not be repeated here.

[0089] It should be noted that the above description describes some embodiments of this disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0090] This disclosure is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A display panel, characterized in that, include: substrate; An isolation structure is located on the substrate. The isolation structure includes a second isolation portion and a first isolation portion. The second isolation portion is located on the side of the first isolation portion away from the substrate. The surface of the side of the first isolation portion away from the substrate is provided with at least one recess. The second isolation portion fills at least a portion of the recess and covers the side of the first isolation portion away from the substrate. The orthographic projection of the first isolation portion on the substrate is located within the orthographic projection of the second isolation portion on the substrate.

2. The display panel as described in claim 1, characterized in that, The coefficient of thermal expansion of the second isolation part is less than that of the first isolation part; Preferably, both the second isolation portion and the first isolation portion comprise a conductive material; Preferably, both the first isolation portion and the second isolation portion are made of metallic material; Preferably, the material of the second isolation portion includes titanium, and the material of the first isolation portion includes aluminum or copper.

3. The display panel as described in claim 1, characterized in that, The recessed portion is recessed toward the substrate side, and the at least one recessed portion is spaced apart along a direction parallel to the surface of the substrate; Preferably, the orthographic projection of the recessed portion on the substrate is located within the orthographic projection of the surface of the first isolation portion on the side opposite to the substrate on the substrate; Preferably, in the direction perpendicular to the plane of the substrate, the cross-sectional shape of the recess is square, trapezoidal, or oblong.

4. The display panel as described in claim 2, characterized in that, The second isolation portion includes a main body portion and a filling portion extending from the main body portion toward the substrate side, the filling portion filling at least a portion of the recessed portion, the main body portion being located on the side of the first isolation portion away from the substrate and protruding from the first isolation portion toward the isolation opening; Preferably, the surface of the filling portion facing away from the substrate is flush with the surface of the first isolation portion facing away from the substrate; Preferably, in the direction perpendicular to the surface of the substrate, the height of the filling portion is less than the height of the recessed portion; Preferably, the main body and the filling part are an integral structure.

5. The display panel as described in claim 4, characterized in that, In the direction perpendicular to the plane where the substrate is located, the depth of the recess is a first depth, the thickness of the first isolation portion is a first thickness, and the first depth is greater than or equal to one-half of the first thickness and less than or equal to two-thirds of the first thickness. In the direction parallel to the surface of the substrate, the width of the recessed portion away from the substrate is a first width, and in the direction perpendicular to the surface of the substrate, the thickness of the main body of the second isolation portion is a second thickness. The first width is greater than or equal to one-third of the second thickness and less than or equal to one-half of the second thickness.

6. The display panel as described in claim 1, characterized in that, The isolation structure is enclosed to form multiple isolation openings; Preferably, the isolation structure further includes a third isolation portion, which is located on the side of the first isolation portion closer to the substrate. The orthographic projection of the third isolation portion on the substrate is within the orthographic projection range of the second isolation portion on the substrate, and the orthographic projection of the first isolation portion on the substrate is within the orthographic projection range of the third isolation portion on the substrate. Preferably, the material of the third isolation section includes molybdenum.

7. The display panel as described in claim 6, characterized in that, The display panel also includes a plurality of light-emitting units, at least a portion of which are located within the isolation opening; Preferably, the light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode stacked together. The first electrode is disposed on one side of the substrate, the light-emitting functional layer is located on the side of the first electrode facing away from the substrate, the second electrode is located on the side of the light-emitting functional layer facing away from the substrate, and the second electrode layer overlaps at least a portion of the sidewall of the isolation structure. Preferably, the second electrode overlaps with the sidewall of the first isolation portion, and / or the second electrode overlaps with the sidewall of the third isolation portion.

8. The display panel as described in claim 7, characterized in that, The display panel also includes: A pixel defining layer is disposed on one side of the substrate, including a pixel defining portion and a plurality of pixel openings formed by the pixel defining portion, wherein the pixel openings are in communication with the corresponding isolation openings; Preferably, the orthographic projection of the pixel opening on the substrate is located within the orthographic projection range of the isolation opening on the substrate; Preferably, the pixel defining portion covers the gap between adjacent first electrodes and the edge of the first electrode.

9. The display panel as described in claim 7, characterized in that, The display panel also includes: The first encapsulation layer includes a plurality of encapsulation portions, each encapsulation portion being located on the side of the corresponding light-emitting unit facing away from the substrate, and extending from the sidewall of the isolation structure to the side of the isolation structure facing away from the substrate.

10. The display panel as claimed in claim 9, characterized in that, Also includes: The second encapsulation layer is located on the side of the first encapsulation layer that is away from the substrate; The third encapsulation layer is located on the side of the second encapsulation layer that is away from the substrate; Preferably, the materials of the first encapsulation layer and the third encapsulation layer include inorganic materials, and the material of the second encapsulation layer includes organic materials.

11. A method for manufacturing a display panel, characterized in that, Includes the following steps: Provide substrate; A first insulating material layer is formed on one side of the substrate; The first insulating material layer is patterned to form at least one recess on the side surface of the first insulating material layer opposite to the substrate; A second isolation material layer is formed on the side of the first isolation material layer away from the substrate, and the second isolation material layer fills at least a portion of the recess in a direction perpendicular to the surface of the substrate. The first and second isolation material layers are patterned to form the first and second isolation portions of the isolation structure.

12. The method for manufacturing a display panel as described in claim 11, characterized in that, The step of forming a first insulating material layer on one side of the substrate further includes: A third insulating material layer is formed on the substrate; Preferably, the step of patterning the first isolation material layer and the second isolation material layer further includes: The first isolation material layer, the second isolation material layer, and the third isolation material layer are patterned to form a first isolation part, a second isolation part, and a third isolation part of an isolation structure, which encloses and forms a plurality of isolation openings.

13. The method for manufacturing a display panel as described in claim 12, characterized in that, Following the step of graphically representing the first isolation material layer, the second isolation material, and the third isolation material layer, the method further includes: Multiple light-emitting units are formed within the multiple isolation openings; Preferably, after the step of forming the plurality of light-emitting units located within the plurality of said isolation openings, the method further includes: A first encapsulation layer is formed on the side of the light-emitting unit facing away from the substrate. The first encapsulation layer includes a plurality of encapsulation portions, each of which is located on the side of the corresponding light-emitting unit facing away from the substrate and extends from the sidewall of the isolation structure to the side of the isolation structure facing away from the substrate.

14. The method for manufacturing a display panel as described in claim 13, characterized in that, Prior to the step of forming the third insulating material layer on the substrate, the method further includes: An insulating material layer is formed on the substrate; Preferably, the step of forming the plurality of light-emitting units located within the plurality of said isolation openings further includes: The insulating material layer is patterned to form pixel defining portions and pixel openings of the pixel defining layer.

15. A display device, characterized in that, It includes a display panel as described in any one of claims 1-10, or a display panel manufactured by the manufacturing method described in any one of claims 11-14.

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