Display panel and preparation method thereof

Abstract

The invention provides a display panel and a preparation method thereof, and relates to the technical field of display, the display panel comprises a substrate, a pixel definition layer and an isolation structure, the pixel definition layer is located on one side of the substrate along the thickness direction, the isolation structure is located on one side of the pixel definition layer away from the substrate, and the isolation structure is adjacent to the pixel definition layer. A plurality of isolation openings are encircled by the isolation structures; the isolation structure comprises a base part, a supporting part and an eave part which are sequentially arranged in a stacked mode in the direction away from the substrate, the spacing distance between the first side face, facing the isolation opening, of the base part and the substrate is gradually increased in the direction facing the isolation opening, and the base part extends out of the supporting part in the direction parallel to the substrate. According to the display panel provided by the invention, the use performance of the display device can be improved.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and more specifically, to a display panel and a method for preparing the same. Background Art

[0002] Currently, flat panel display devices have the advantages of high image quality, power saving, small thickness and wide application range, and are widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc.

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

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

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

[0006] In a first aspect, a display panel is provided, comprising: a substrate, a pixel definition layer and an isolation structure, wherein the pixel definition layer is located on one side of the substrate along the thickness direction, the isolation structure is located on the side of the pixel definition layer away from the substrate, and the isolation structure is adjacent to the pixel definition layer, and the isolation structure encloses and forms a plurality of isolation openings; the isolation structure comprises a base portion, a support portion and an eaves portion which are sequentially stacked in a direction away from the substrate, the spacing distance between the base portion and the first side surface of the isolation opening and the substrate gradually increases in the direction toward the isolation opening, and the base portion extends out of the support portion in a direction parallel to the substrate.

[0007] Through the above technical solution, in the direction parallel to the substrate, the base part extends out of the supporting part, and there may be a gap between the first side surface and the pixel definition layer. The light-emitting layer of the light-emitting unit may enter the gap during evaporation, thereby preventing the light-emitting layer of the light-emitting unit from overlapping the side of the base part away from the substrate, thereby preventing leakage of the light-emitting layer, avoiding affecting the lighting effect to a certain extent, and thus improving the performance.

[0008] Therefore, the display panel provided in the present application can improve the performance of the display device.

[0009] In some embodiments, a recessed portion is provided on a side of the pixel definition layer facing away from the substrate, and an orthographic projection of the recessed portion on the substrate overlaps an orthographic projection of the first side surface on the substrate.

[0010] Optionally, an orthographic projection of the first side surface on the substrate is located within an orthographic projection of the recessed portion on the substrate.

[0011] In some embodiments, the angle between the first side and the plane where the substrate is located is θ 2, θ 2<θ 1; θ 1 satisfies the following formula:

[0012] tan θ 1=a / b; the distance between the boundary of the orthographic projection of the eaves portion on the substrate and the boundary of the orthographic projection of the base portion on the substrate is equal to b, and the distance between the eaves portion and the base portion in the thickness direction of the substrate is equal to a.

[0013] Optionally, 45°≤ θ 1≤60°,θ2≤30°.

[0014] In some embodiments, the thickness of the base portion is d, and the value range of d is: 20nm<d≤50nm.

[0015] Optionally, the value range of d is: 30nm≤d≤50nm.

[0016] Optionally, the value of d is 25nm, 30nm, 35nm, 40nm, 45nm or 50nm.

[0017] In some embodiments, the display panel also includes a plurality of light-emitting units, an orthographic projection of the light-emitting unit on the substrate overlaps with an orthographic projection of the corresponding isolation opening on the substrate, the light-emitting unit includes a light-emitting layer and a first electrode arranged in sequence along a direction away from the substrate, the orthographic projection of the light-emitting layer and the first electrode of the light-emitting unit on the substrate are located within the orthographic projection of the corresponding isolation opening on the substrate, the light-emitting layer includes a first edge, the orthographic projection of the first edge on the substrate overlaps with the orthographic projection of the first side on the substrate, and the first edge is located on the side of the first side facing the substrate.

[0018] Optionally, the first electrode includes a second edge, an orthographic projection of the second edge on the substrate overlaps with an orthographic projection of the base portion on the substrate, and the second edge is located on a side of the base portion facing away from the substrate.

[0019] Optionally, the second edge of the first electrode overlaps the base portion and / or the support portion.

[0020] In some embodiments, the first edge extends into the recess.

[0021] In some embodiments, an edge of the first side surface on the orthographic projection of the substrate that is away from the isolation opening is a third edge, and the first edge is located on a side of the third edge that is close to the isolation opening.

[0022] Optionally, a spacing distance between the first edge and the third edge is c1, 100 nm≤c1≤200 nm.

[0023] In some embodiments, the light-emitting layer includes a first film layer, a light-emitting functional layer, a light-emitting main layer, and a second film layer which are sequentially stacked in a direction away from the substrate, an edge of the first film layer is a first edge of the light-emitting layer, the first film layer includes a hole transport layer, or the first film layer includes a hole injection layer and a hole transport layer which are sequentially arranged in a direction away from the substrate, or the first film layer includes a hole injection layer, a hole transport layer, and an electron blocking layer which are sequentially arranged in a direction away from the substrate.

[0024] Optionally, the first edge is spaced apart from the base portion or the first side surface.

[0025] Optionally, the second film layer includes an electron transport layer.

[0026] Optionally, the second film layer includes an electron transport layer and an electron injection layer which are sequentially arranged in a direction away from the substrate.

[0027] Optionally, the second film layer includes a hole blocking layer, an electron transport layer and an electron injection layer which are sequentially arranged in a direction away from the substrate.

[0028] Optionally, the first side surface is arranged at a distance from the orthographic projection of the substrate and the orthographic projection of the support portion on the substrate.

[0029] In some embodiments, the display panel provided in the present application also includes a second electrode layer, the pixel definition layer has a pixel opening, the pixel opening is located in the orthographic projection of the substrate within the orthographic projection of the isolation opening on the substrate, the second electrode layer is located on one side of the substrate along the thickness direction, a portion of the pixel definition layer is located on the side of the second electrode layer away from the substrate, the second electrode layer includes a plurality of spaced second electrodes, and the pixel opening exposes a portion of the second electrode.

[0030] In some embodiments, the orthographic projections of the base portion and the support portion on the substrate are located within the orthographic projection of the eave portion on the substrate.

[0031] In a second aspect, a display panel is provided, comprising: a substrate, a pixel definition layer and an isolation structure, wherein the pixel definition layer is located on one side of the substrate along the thickness direction, the isolation structure is located on the side of the pixel definition layer away from the substrate, and the isolation structure is adjacent to the pixel definition layer, and the isolation structure encloses and forms a plurality of isolation openings; the isolation structure comprises a base portion, a support portion and an eaves portion which are sequentially stacked in a direction away from the substrate, the orthographic projection of the support portion on the substrate is located within the orthographic projection of the base portion on the substrate, the base portion is adjacent to the pixel definition layer, and a gap connecting the isolation openings is provided between the edge of the base portion and the pixel definition layer.

[0032] Through the above technical solution, the orthographic projection of the supporting part on the substrate is located within the orthographic projection of the base part on the substrate, and there is a gap with a connected isolation opening between the edge of the base part and the pixel definition layer. The light-emitting layer of the light-emitting unit can enter the gap during evaporation, which can prevent the light-emitting layer of the light-emitting unit from overlapping the side of the base part away from the substrate, thereby avoiding leakage of the light-emitting layer, avoiding affecting the lighting effect to a certain extent, and thus improving the performance.

[0033] Therefore, the display panel provided in the present application can improve the performance of the display device.

[0034] In some embodiments, the display panel further includes a plurality of light emitting units, the light emitting units include a light emitting layer and a first electrode sequentially arranged in a direction away from the substrate, the light emitting layer includes a first edge, and the first edge extends into the gap.

[0035] Optionally, an edge of the first electrode is located on a side of the base portion facing away from the substrate.

[0036] In some embodiments, the light-emitting layer includes a first film layer, a light-emitting functional layer, a light-emitting main layer, and a second film layer which are sequentially stacked in a direction away from the substrate, an edge of the first film layer is a first edge of the light-emitting layer, the first film layer includes a hole transport layer, or the first film layer includes a hole injection layer and a hole transport layer which are sequentially arranged in a direction away from the substrate, or the first film layer includes a hole injection layer, a hole transport layer, and an electron blocking layer which are sequentially arranged in a direction away from the substrate.

[0037] Optionally, the first edge is spaced apart from the base portion.

[0038] Optionally, the second film layer includes an electron transport layer.

[0039] Optionally, the second film layer includes an electron transport layer and an electron injection layer which are sequentially arranged in a direction away from the substrate.

[0040] Optionally, the second film layer includes a hole blocking layer, an electron transport layer and an electron injection layer which are sequentially arranged in a direction away from the substrate.

[0041] In some embodiments, the spacing distance between the first side surface of the base portion facing the isolation opening and the substrate gradually increases along the direction approaching the isolation opening, and the above-mentioned gap is formed between the first side surface of the base portion and the pixel definition layer, and / or, a recessed portion is provided on a side of the pixel definition layer facing away from the substrate, and the orthographic projection of the recessed portion on the substrate overlaps with the orthographic projection of the base portion on the substrate, and the orthographic projection of the gap on the substrate is located within the orthographic projection of the recessed portion on the substrate.

[0042] Optionally, an orthographic projection of the recessed portion on the substrate does not overlap with an orthographic projection of the supporting portion on the substrate.

[0043] In a third aspect, a method for preparing a display panel is provided, comprising:

[0044] providing a substrate;

[0045] Preparing a pixel definition layer on one side of the substrate along the thickness direction;

[0046] An isolation structure is prepared on a side of the pixel definition layer facing away from the substrate, and a plurality of isolation openings are formed by patterning;

[0047] The isolation structure includes a base portion, a support portion and an eaves portion stacked in sequence in a direction away from the substrate, the base portion is adjacent to the pixel definition layer, and a gap connecting the isolation opening is provided between the edge of the base portion and the pixel definition layer.

[0048] Through the above technical scheme, the preparation method of the display panel provided in the present application can create a gap between the edge of the base part and the pixel definition layer, and the light-emitting layer of the light-emitting unit can enter the gap during evaporation, thereby preventing the light-emitting layer of the light-emitting unit from overlapping the side of the base part away from the substrate, thereby preventing leakage of the light-emitting layer, and avoiding affecting the lighting effect to a certain extent, thereby improving the performance of use.

[0049] In some embodiments, after preparing a pixel definition layer on one side of the substrate along the thickness direction and before preparing an isolation structure on a side of the pixel definition layer facing away from the substrate, the method for preparing a display panel provided in the present application further includes:

[0050] A recessed portion is prepared on a side of the pixel definition layer facing away from the substrate, the orthographic projection of the recessed portion on the substrate overlaps with the orthographic projection of the base portion on the substrate, and at least part of the gap is located in the recessed portion.

[0051] In some embodiments, an isolation structure is prepared on a side of the pixel definition layer facing away from the substrate, and a plurality of isolation openings are patterned, including:

[0052] Prepare an isolation structure on a side of the pixel definition layer facing away from the substrate;

[0053] The isolation structure is patterned to form a plurality of isolation openings and a plurality of gaps.

[0054] In some embodiments, the spacing distance between the first side surface of the base portion facing the isolation opening and the substrate gradually increases in the direction toward the isolation opening. After the isolation structure is prepared on the side of the pixel definition layer facing away from the substrate, the preparation method provided by the present application further includes:

[0055] Patterning the pixel definition layer to form a plurality of pixel openings, wherein the orthographic projections of the pixel openings on the substrate are located within the orthographic projections of the corresponding isolation openings on the substrate;

[0056] The first film layer is prepared by an evaporation process, wherein the evaporation angle of the evaporation process is greater than the angle between the first side surface and the plane where the substrate is located; the first film layer includes a hole transport layer; or, the first film layer includes a hole injection layer and a hole transport layer arranged in sequence along a direction away from the substrate; or, the first film layer includes a hole injection layer, a hole transport layer and an electron blocking layer arranged in sequence along a direction away from the substrate.

[0057] In a fourth aspect, the present application provides a display panel, which includes a substrate and an isolation structure, wherein the isolation structure encloses and forms a plurality of isolation openings; the isolation structure includes a base portion, a support portion, and an eave portion which are stacked in sequence in a direction away from the substrate, the base portion includes a first surface close to the substrate and a second surface away from the substrate, the orthographic projection of the first surface on the substrate is located within the orthographic projection area of ​​the second surface on the substrate, and the base portion extends out of the support portion in a direction parallel to the substrate.

[0058] Through the above technical solution, the display panel provided by the present application can prevent the light-emitting layer of the light-emitting unit from overlapping the supporting part, and can avoid leakage of the light-emitting layer to a certain extent, thereby avoiding affecting the lighting effect and further improving the performance.

[0059] In some embodiments, the base portion further includes a first side surface connecting the first surface and the second surface; and a spacing distance between the first side surface and the substrate gradually increases in a direction toward the isolation opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0061] Figure 1 A schematic diagram of the planar structure of a display panel provided in an embodiment of the present application;

[0062] Figure 2 for Figure 1 One of the partial enlarged views at A in the middle;

[0063] Figure 3 For along Figure 2 The cross-sectional structure diagram of the middle BB line;

[0064] Figure 4 for Figure 1 The second partial enlarged view of point A in the middle;

[0065] Figure 5 For along Figure 4 One of the cross-sectional structural diagrams of the CC line;

[0066] Figure 6 For along Figure 4 The second cross-sectional structure diagram of the CC line;

[0067] Figure 7 For along Figure 4 The third cross-sectional structure diagram of the CC line;

[0068] Figure 8 for Figure 6 A partial enlarged view of point D in the middle;

[0069] Fig. 9 for Figure 7 A partial enlarged view of point F in the middle;

[0070] Fig.10 A schematic diagram of a partial structure of a light-emitting layer provided in an embodiment of the present application;

[0071] Fig.11 One of the schematic flow charts of the method for preparing a display panel provided in an embodiment of the present application;

[0072] Fig.12 The second schematic flow chart of the method for preparing a display panel provided in an embodiment of the present application.

[0073] Among them, the reference numerals in the figure are:

[0074] 100-display panel; 10-substrate; 20-second electrode; 30-pixel definition layer; 31-recess; 40-isolation structure; 401-isolation opening; 402-gap; 41-base; 411-first side; 4111-third edge; 412-first surface; 413-second surface; 42-supporting portion; 43-eaves portion; 50-light-emitting layer; 501-first edge; 51-first film layer; 52-light-emitting functional layer; 53-second film layer; 60-first electrode; 601-second edge; 70-first encapsulation layer; 80-second encapsulation layer; 90-third encapsulation layer. DETAILED DESCRIPTION

[0075] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0076] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0077] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0079] Please also read Figure 1 , Figure 2 and Figure 3 The present application provides a display panel 100 , which may be an organic light-emitting diode (OLED) display panel 100 or a micro light-emitting diode (Micro Light Emitting Diode, Micro LED / μLED) display panel 100 .

[0080] The display panel 100 includes a substrate 10 including a display area AA and a non-display area NA surrounding at least a portion of the display area AA.

[0081] The display panel 100 further includes a pixel definition layer 30 and an isolation structure 40, wherein the isolation structure 40 is disposed on one side of the substrate 10 along the thickness direction, and the isolation structure 40 is disposed on the side of the pixel definition layer 30 away from the substrate 10, and the isolation structure 40 encloses a plurality of isolation openings 401. Optionally, the pixel definition layer 30 and the isolation structure 40 may be located in the display area AA.

[0082] It should be noted that the composition, preparation and other contents of the isolation structure 40 are described in patents CN118251982A, 202410864269.8, PCT / CN2024 / 098407, PCT / CN2024 / 102783, PCT / CN2024 / 098217, PCT / CN2024 / 099419, PCT / CN2024 / 09907 2. Further descriptions are provided in CN117979755A, CN117998900A, CN117062489A, CN117580403A, CN116583155A, CN116669477A, ​​CN117396039A, CN116669480A, CN116600606A, and CN117500332A for reference.

[0083] The display panel 100 further includes a light emitting unit. The light emitting layer 50 and the first electrode 60 of the light emitting unit are located in the isolation opening 401 , and the first electrode 60 is located on a side of the light emitting layer 50 facing away from the substrate 10 .

[0084] The inventors found that the light-emitting layer 50 of the light-emitting unit is easy to climb up between the isolation structure 40 and the first electrode 60 during evaporation, which may cause leakage of the light-emitting layer 50, increase the lap impedance of the first electrode 60, and affect the light-emitting effect of the light-emitting layer 50. For example, the light-emitting brightness of the light-emitting layer 50 is low.

[0085] Please also read Figure 4 and Figure 5 In order to solve the above technical problems, the embodiment of the present application provides a display panel 100, in which the isolation structure 40 includes a base portion 41, a support portion 42 and an eaves portion 43 which are sequentially stacked in a direction away from the substrate 10, and in a direction parallel to the substrate, the base portion 41 extends out of the support portion 42. That is, the area of ​​the orthographic projection of the support portion 42 on the substrate 10 is smaller than the area of ​​the orthographic projection of the base portion 41 on the substrate 10. In this way, the base portion 41 can carry the support portion 42.

[0086] Optionally, the spacing distance between the first side surface 411 of the base portion 41 facing the isolation opening 401 and the substrate 10 gradually increases in the direction toward the isolation opening 401. That is, there is a gap 402 between the first side surface 411 and the pixel definition layer 30, and the size of the gap 402 in the direction perpendicular to the substrate 10 gradually increases in the direction toward the isolation opening 401. The light-emitting layer 50 of the light-emitting unit can enter the gap 402 during evaporation, which can prevent the light-emitting layer 50 of the light-emitting unit from overlapping the side of the base portion 41 away from the substrate 10, thereby preventing the light-emitting layer 50 from leaking electricity, improving the impedance of the first electrode 60, and avoiding affecting the lighting effect to a certain extent, thereby improving the performance.

[0087] Therefore, the display panel 100 provided in the embodiment of the present application can improve the performance of the display device.

[0088] Optionally, the first side surface 411 may be an inclined surface, and a cross section of the base portion 41 perpendicular to the substrate 10 may be a trapezoid.

[0089] Optionally, the first side surface 411 may be a curved surface.

[0090] Optionally, the orthographic projections of the base portion 41 and the support portion 42 on the substrate 10 are located within the orthographic projection of the eaves portion 43 on the substrate 10. That is, the orthographic projections of the base portion 41 and the support portion 42 on the substrate 10 are smaller than the orthographic projections of the eaves portion 43 on the substrate 10, and the eaves portion 43 covers the base portion 41 and the support portion 42.

[0091] It is understood that the material of the base portion 41 may include molybdenum (Mo), the material of the support portion 42 may include aluminum (Al), and the material of the eaves portion 43 may include titanium (Ti). When forming the isolation opening 401, molybdenum and aluminum are easier to etch than titanium, so the area of ​​the orthographic projection of the eaves portion 43 on the substrate 10 may be larger than the orthographic projection of the base portion 41 and the support portion 42 on the substrate 10. Similarly, aluminum is easier to etch than molybdenum, so the area of ​​the orthographic projection of the base portion 41 on the substrate 10 may be larger than the orthographic projection of the support portion 42 on the substrate 10.

[0092] Please also read Figure 6 In some embodiments, a recessed portion 31 is provided on the side of the pixel definition layer 30 facing away from the substrate 10, and the orthographic projection of the recessed portion 31 on the substrate 10 overlaps with the orthographic projection of the first side surface 411 on the substrate 10. In this way, the gap 402 can be located between the first side surface 411 and the wall surface of the recessed portion 31, and the size of the gap 402 can be increased so that the gap 402 can accommodate the light-emitting layer 50, thereby preventing the light-emitting layer 50 from climbing up between the base portion 41 and the first electrode 60.

[0093] Exemplarily, the recessed portion 31 is located at an edge of the isolation opening 401 where the orthographic projection of the substrate 10 is close to the isolation opening 401 , and at a side of the first side surface 411 where the orthographic projection of the substrate 10 is close to the isolation opening 401 .

[0094] Exemplarily, the orthographic projection of the first side surface 411 on the substrate 10 is located within the orthographic projection of the recessed portion 31 on the substrate 10 .

[0095] Please continue reading Figure 6 In some embodiments, the angle between the first side surface 411 and the plane where the substrate 10 is located is θ 2, θ 2< θ 1; θ1 satisfies the formula: tanθ 1=a / b. The distance between the boundary of the orthographic projection of the eaves 43 on the substrate 10 and the boundary of the orthographic projection of the base 41 on the substrate 10 is equal to b, and the distance between the eaves 43 and the base 41 in the thickness direction of the substrate 10 is equal to a.

[0096] In this way, during the evaporation, the portion of the light emitting layer 50 close to the isolation structure 40 can enter the gap 402 to avoid overlapping with the base portion 41 .

[0097] Optionally, 45°≤ θ 1≤60°, θ 2≤30°. Exemplarily, θ The value of 1 can be 45°, 50°, 55°, 60°, etc. For example, θ The value of 2 can be 5°, 10°, 15°, 20°, 25°, 30°, etc.

[0098] In some embodiments, the thickness of the base portion 41 is d, and the value range of d is: 20 nm<d≤50 nm.

[0099] Optionally, the value range of d is: 30nm≤d≤50nm.

[0100] Optionally, the value of d is 25nm, 30nm, 35nm, 40nm, 45nm, 50nm, etc.

[0101] It is understandable that the thickness of the base part 41 is usually less than 20 nm. However, the display panel 100 of the embodiment of the present application needs to tilt the first side surface 411 of the base part 41 to increase the thickness of the base part 41, which can avoid the base part 41 having the first side surface 411 from being broken or crushed, thereby improving the reliability of the base part 41.

[0102] Please continue reading Figure 7 In some embodiments, there are multiple light-emitting units, and the light-emitting layer 50 includes a first edge 501, the orthographic projection of the first edge 501 on the substrate 10 overlaps with the orthographic projection of the first side surface 411 on the substrate 10, and the first edge 501 is located on the side of the first side surface 411 facing the substrate 10. It can be understood that the first edge 501 of the light-emitting layer 50 is located on the side of the first side surface 411 facing the substrate 10, and the light-emitting layer 50 will not overlap the base portion 41, thereby preventing the light-emitting layer 50 from leaking electricity.

[0103] Optionally, the first electrode 60 includes a second edge 601, and the orthographic projection of the second edge 601 on the substrate 10 overlaps with the orthographic projection of the base portion 41 on the substrate 10. In addition, the second edge 601 is located on the side of the base portion 41 away from the substrate 10, so that the first electrode 60 can be overlapped on the base portion 41, and the second edge 601 of the first electrode 60 is prevented from extending into the gap 402 between the first side surface 411 and the pixel definition layer 30, thereby improving the impedance of the first electrode 60, which is beneficial to improving the light-emitting effect.

[0104] Optionally, the first edge 501 extends into the recess 31, so that the portion of the light-emitting layer 50 close to the first edge 501 is located in the recess 31. In this way, the side of the light-emitting layer 50 facing away from the substrate 10 is spaced from the first side surface 411, that is, the side of the light-emitting layer 50 facing away from the substrate 10 is not in contact with the first side surface 411.

[0105] It is understandable that when the side of the light emitting layer 50 facing away from the substrate 10 contacts the first side 411, leakage of the light emitting layer 50 may occur. The display panel 100 provided by the present application prevents the light emitting layer 50 from contacting the first side 411, thereby preventing leakage of the light emitting layer 50.

[0106] Please also read Figure 8 and Fig. 9 In some embodiments, the edge of the first side surface 411 on the substrate 10 that is away from the isolation opening 401 is the third edge 4111 , and the first edge 501 is located on a side of the third edge 4111 that is close to the isolation opening 401 .

[0107] Optionally, a spacing distance between the first edge and the third edge 4111 is c, 100nm≤c≤200nm.

[0108] Optionally, 100nm≤c≤150nm. Optionally, 150nm≤c≤200nm.

[0109] Exemplarily, the value of c may be: 100 nm, 110 nm, 120 nm, 130 nm, 140 nm, 150 nm, 160 nm, 170 nm, 180 nm, 190 nm, 200 nm.

[0110] It is understandable that the light-emitting layer 50 does not fill the gap 402. When the light-emitting layer 50 is evaporated, if the gap 402 is filled, the material of the film layer that is prone to leakage may be squeezed and diffused to contact the base part 41, causing leakage. Therefore, the display panel 100 provided in the embodiment of the present application can prevent the light-emitting layer 50 from leaking.

[0111] See also Fig.10In some embodiments, the light-emitting layer 50 includes a first film layer 51 , a light-emitting functional layer 52 , and a second film layer 53 stacked in sequence in a direction away from the substrate 10 , and an edge of the first film layer 51 is a first edge 501 of the light-emitting layer 50 .

[0112] Optionally, the orthographic projection of the first film layer 51 on the substrate 10 is located within the orthographic projection of the light-emitting functional layer 52 on the substrate 10. Optionally, the orthographic projection of the light-emitting functional layer 52 on the substrate 10 is located within the orthographic projection of the second film layer 53 on the substrate 10. That is, the second film layer 53 covers the light-emitting functional layer 52, and the light-emitting functional layer 52 covers the first film layer 51.

[0113] It is understandable that when the light-emitting layer 50 leaks electricity, it is usually the first film layer 51 and the light-emitting functional layer 52 in the light-emitting layer 50 that cause leakage. Even if the second film layer 53 contacts the isolation structure 40, the light-emitting layer 50 is not prone to leakage.

[0114] In the display panel 100 of the embodiment of the present application, the portion of the light-emitting layer 50 close to the isolation structure 40 is located on the side of the isolation structure 40 facing the substrate 10, that is, the second film layer 53 can contact the isolation structure 40, but no leakage occurs. In addition, the second film layer 53 separates the first film layer 51 and the light-emitting functional layer 52 from the isolation structure 40, preventing the first film layer 51 and the light-emitting functional layer 52 from contacting the isolation structure 40, thereby preventing leakage from occurring on the wall surface.

[0115] Exemplarily, the first film layer 51 includes a hole transport layer.

[0116] Exemplarily, the first film layer 51 includes a hole injection layer and a hole transport layer which are sequentially arranged in a direction away from the substrate 10 .

[0117] Exemplarily, the first film layer 51 includes a hole injection layer, a hole transport layer, and an electron blocking layer which are sequentially arranged in a direction away from the substrate 10 .

[0118] Exemplarily, the second film layer 53 includes an electron transport layer.

[0119] Exemplarily, the second film layer 53 includes an electron transport layer and an electron injection layer which are sequentially arranged in a direction away from the substrate 10 .

[0120] Exemplarily, the second film layer 53 includes a hole blocking layer, an electron transport layer, and an electron injection layer which are sequentially arranged in a direction away from the substrate 10 .

[0121] It is understandable that the structural composition of the first film layer 51 and the second film layer 53 can be selected according to the specific product or application scenario.

[0122] Optionally, the first edge 501 is spaced apart from the base portion 41 or the first side surface 411. This can prevent the light-emitting layer 50 and the first film layer 51 from contacting the base portion 41 or the first side surface 411, and can prevent the light-emitting layer 50 from leaking electricity.

[0123] Optionally, the orthographic projection of the first side surface 411 on the substrate 10 is spaced from the orthographic projection of the support portion 42 on the substrate 10. In this way, the first side surface 411 will not extend below the support portion 42, so that the base portion 41 can provide a good support effect on the support portion 42.

[0124] In some embodiments, the display panel 100 provided in the present application further includes a second electrode layer, the pixel definition layer 30 has a pixel opening, the orthographic projection of the pixel opening on the substrate 10 is located within the orthographic projection of the isolation opening 401 on the substrate 10, the second electrode layer is located on one side of the substrate 10 along the thickness direction, a portion of the pixel definition layer 30 is located on a side of the second electrode layer away from the substrate 10, the second electrode layer includes a plurality of spaced second electrodes 20, and the pixel opening exposes a portion of the second electrode 20. In this way, the light-emitting layer 50 can be connected to the exposed portion of the second electrode 20, and the second electrode 20 can transmit signals for the light-emitting layer 50.

[0125] Please continue reading Figure 5 The embodiment of the present application also provides another display panel 100. In the display panel 100 of the embodiment of the present application, the isolation structure 40 includes a base portion 41, a support portion 42 and an eaves portion 43 which are stacked in sequence along a direction away from the substrate 10. The orthographic projection of the support portion 42 on the substrate 10 is located within the orthographic projection of the base portion 41 on the substrate 10. The base portion 41 is adjacent to the pixel definition layer 30, and a gap 402 connecting the isolation opening 401 is provided between the edge of the base portion 41 and the pixel definition layer 30.

[0126] In this way, the light-emitting layer 50 of the light-emitting unit can enter the gap 402 during evaporation, which can prevent the light-emitting layer 50 of the light-emitting unit from overlapping the side of the base part 41 away from the substrate 10, thereby preventing the light-emitting layer 50 from leaking electricity, and to a certain extent avoiding affecting the lighting effect, thereby improving the performance of use.

[0127] Therefore, the display panel 100 provided in the embodiment of the present application can improve the performance of the display device.

[0128] Optionally, an edge (first edge 501 ) of the light emitting layer 50 extends into the gap 402 .

[0129] Optionally, an edge (second edge 601 ) of the first electrode 60 is located on a side of the base portion 41 facing away from the substrate 10 .

[0130] In some embodiments, the spacing between the first side surface 411 of the base portion 41 and the substrate 10 toward the isolation opening 401 gradually increases in a direction approaching the isolation opening 401 , and the gap 402 is formed between the first side surface 411 of the base portion 41 and the pixel definition layer 30 .

[0131] Optionally, a recessed portion 31 is provided on the side of the pixel definition layer 30 facing away from the substrate 10, the orthographic projection of the recessed portion 31 on the substrate 10 overlaps with the orthographic projection of the base portion 41 on the substrate 10, and the orthographic projection of the gap 402 on the substrate 10 is located within the orthographic projection of the recessed portion 31 on the substrate 10. In this way, the gap 402 can be located between the base portion 41 and the wall surface of the recessed portion 31, and the size of the gap 402 can be increased so that the gap 402 can accommodate the light-emitting layer 50, thereby preventing the light-emitting layer 50 from climbing up between the base portion 41 and the first electrode 60.

[0132] Optionally, the orthographic projection of the recessed portion 31 on the substrate 10 does not overlap with the orthographic projection of the supporting portion 42 on the substrate 10. In this way, the recessed portion 31 does not extend below the supporting portion 42, so that the base portion 41 can provide a good supporting effect on the supporting portion 42.

[0133] In some embodiments, please refer to Figure 5 The embodiment of the present application also provides another display panel, in which the base portion 41 includes a first surface 412 close to the substrate 10 and a second surface 413 away from the substrate 10, the orthographic projection of the first surface 412 on the substrate 10 is located within the orthographic projection area of ​​the second surface 413 on the substrate 10, and the base portion 41 extends out of the support portion 42 in a direction parallel to the substrate 10.

[0134] In this way, the base portion 41 extends out of the support portion 42, and the display panel provided in the present application can prevent the light-emitting layer 50 of the light-emitting unit from overlapping the support portion 42, and can prevent leakage of the light-emitting layer 50 to a certain extent, thereby avoiding affecting the lighting effect and further improving the performance.

[0135] It can be understood that the light emitting layer 50 includes a first film layer 51 , a light emitting functional layer 52 , and a second film layer 53 which are sequentially stacked in a direction away from the substrate 10 .

[0136] The orthographic projection of the first film layer 51 on the substrate 10 is located within the orthographic projection of the light-emitting functional layer 52 on the substrate 10, and the orthographic projection of the light-emitting functional layer 52 on the substrate 10 is located within the orthographic projection of the second film layer 53 on the substrate 10. That is, the second film layer 53 covers the light-emitting functional layer 52, and the light-emitting functional layer 52 covers the first film layer 51.

[0137] It is understandable that when the light-emitting layer 50 leaks electricity, it is usually the first film layer 51 and the light-emitting functional layer 52 in the light-emitting layer 50 that cause leakage. Even if the second film layer 53 contacts the isolation structure 40, the light-emitting layer 50 is not prone to leakage.

[0138] In some embodiments, the base portion 41 further includes a first side surface 411 connecting the first surface 412 and the second surface 413; the spacing distance between the first side surface 411 and the substrate 10 gradually increases in the direction toward the isolation opening 401. In other words, there is a gap 402 between the first side surface 411 and the pixel definition layer 30, and the size of the gap 402 in the direction perpendicular to the substrate 10 gradually increases in the direction toward the isolation opening 401. The light-emitting layer 50 of the light-emitting unit can enter the gap 402 during evaporation, which can prevent the light-emitting layer 50 of the light-emitting unit from overlapping the side of the base portion 41 away from the substrate 10, thereby preventing the light-emitting layer 50 from leaking electricity, improving the impedance of the first electrode 60, and avoiding affecting the lighting effect to a certain extent, thereby improving the performance.

[0139] In some embodiments, please refer to Figure 3 The display panel 100 further includes a first encapsulation layer 70, which is disposed on a side of the pixel definition layer 30 facing away from the substrate 10 and is located on a side of the light-emitting unit facing away from the substrate 10. The first encapsulation layer 70 includes a plurality of encapsulation parts, and the encapsulation parts cover the corresponding isolation openings 401. In other words, the orthographic projection of the isolation opening 401 on the substrate 10 is located within the orthographic projection of the corresponding encapsulation part on the substrate 10.

[0140] The light emitting unit may include a first light emitting unit, a second light emitting unit and a third light emitting unit, and the first light emitting unit, the second light emitting unit and the third light emitting unit may emit light of different colors. For example, the first light emitting unit may emit red light, the second light emitting unit may emit green light, and the third light emitting unit may emit blue light.

[0141] It can be understood that the first light-emitting unit, the second light-emitting unit and the third light-emitting unit are sequentially evaporated and patterned. The packaging part may include three parts, the first part corresponds to the first light-emitting unit, and the first part is also formed by patterning, the second part corresponds to the second light-emitting unit, and the second part is also formed by patterning, and the third part corresponds to the third light-emitting unit, and the third part is also formed by patterning.

[0142] Optionally, the display panel 100 may further include a second encapsulation layer 80 , where the second encapsulation layer 80 is located on a side of the first encapsulation layer 70 facing away from the substrate 10 .

[0143] Optionally, the display panel 100 may further include a third encapsulation layer 90 , where the third encapsulation layer 90 is located on a side of the second encapsulation layer 80 facing away from the substrate 10 .

[0144] Optionally, the first encapsulation layer 70 may be an inorganic encapsulation layer formed by chemical vapor deposition (CVD) and patterning.

[0145] Optionally, the second encapsulation layer 80 may be an organic layer made by ink jet printing (Ink Jet Print DAM, IJP).

[0146] Optionally, the third encapsulation layer 90 may also be an inorganic encapsulation layer formed by chemical vapor deposition.

[0147] Optionally, the display panel 100 provided in the embodiment of the present application may further include other film layers, and the other film layers may include a polarizing film, an optically clear adhesive (OCA), etc. located on the side of the third encapsulation layer 90 facing away from the substrate.

[0148] See also Fig.11 The present application also provides a method for preparing a display panel 100, the method comprising the following steps:

[0149] S1, providing a substrate 10;

[0150] S2, preparing a pixel definition layer 30 on one side of the substrate 10 along the thickness direction;

[0151] S3, preparing an isolation structure 40 on the side of the pixel definition layer 30 facing away from the substrate 10, and patterning to form a plurality of isolation openings 401;

[0152] Among them, the isolation structure 40 includes a base part 41, a support part 42 and an eaves part 43 which are stacked in sequence along a direction away from the substrate 10. The base part 41 is adjacent to the pixel definition layer 30, and there is a gap 402 between the edge of the base part 41 and the pixel definition layer 30 to connect to the isolation opening 401.

[0153] In this way, the preparation method of the display panel 100 provided in the present application can create a gap 402 between the edge of the base part and the pixel definition layer 30, and the light-emitting layer 50 of the light-emitting unit can enter the gap 402 during evaporation, which can prevent the light-emitting layer 50 of the light-emitting unit from overlapping the side of the base part 41 away from the substrate 10, thereby preventing the light-emitting layer 50 from leaking electricity, and to a certain extent avoiding affecting the lighting effect, thereby improving the performance of use.

[0154] See also Fig.12 Optionally, in step S3, when preparing the isolation structure 40 on the side of the pixel definition layer 30 facing away from the substrate 10, the following steps are included:

[0155] S31, preparing an isolation structure 40 on a side of the pixel definition layer 30 facing away from the substrate 10;

[0156] S32 , patterning the isolation structure 40 to form a plurality of isolation openings 401 and a plurality of gaps 402 .

[0157] It is understandable that the method for preparing the display panel 100 provided in the present application first deposits a metal film layer (molybdenum, aluminum, titanium) on the side of the pixel definition layer 30 facing away from the substrate 10, and then forms the plurality of isolation openings 401 and the plurality of gaps 402 through an etching process.

[0158] Please continue reading Fig.10 In some embodiments, after step S3, the preparation method provided in this embodiment further includes:

[0159] S4, patterning the pixel definition layer 30 to form a plurality of pixel openings, wherein the orthographic projections of the pixel openings on the substrate 10 are located within the orthographic projections of the corresponding isolation openings 401 on the substrate 10;

[0160] S5, preparing the first film layer 51 by an evaporation process, wherein the evaporation angle of the evaporation process is greater than the angle between the first side surface 411 and the plane where the substrate 10 is located. The first film layer 51 includes a hole transport layer; or the first film layer 51 includes a hole injection layer and a hole transport layer sequentially arranged in a direction away from the substrate 10; or the first film layer 51 includes a hole injection layer, a hole transport layer and an electron blocking layer sequentially arranged in a direction away from the substrate 10.

[0161] It can be understood that after the preparation method of the display panel 100 provided in the present application prepares the first film layer 51, the light-emitting functional layer 52 and the second film layer 53 can also be prepared by an evaporation process. Among them, the second film layer 53 includes an electron transport layer. Alternatively, the second film layer 53 includes an electron transport layer and an electron injection layer sequentially arranged in a direction away from the substrate 10. Alternatively, the second film layer 53 includes a hole blocking layer, an electron transport layer and an electron injection layer sequentially arranged in a direction away from the substrate 10. After the preparation method of the display panel 100 provided in the present application prepares the second film layer 53, the first electrode 60 can also be prepared by an evaporation process. The evaporation angle for preparing the first electrode 60 can be the same as the evaporation angle for preparing the first film layer 51.

[0162] Please continue reading Fig.10 In some embodiments, after step S5, the preparation method provided in the embodiment of the present application further includes:

[0163] S6, preparing a first encapsulation layer 70 on a side of the first film layer 51 facing away from the substrate 10;

[0164] S7, forming a second encapsulation layer 80 on a side of the first encapsulation layer 70 facing away from the substrate 10;

[0165] S8 , forming a third encapsulation layer 90 on a side of the second encapsulation layer 80 facing away from the substrate 10 .

[0166] It can be understood that the first encapsulation layer 70 is also located on the side of the second film layer 53 facing away from the substrate 10 .

[0167] Optionally, the material of the first encapsulation layer 70 includes an inorganic material, the material of the second encapsulation layer 80 includes an organic material, and the material of the third encapsulation layer 90 includes an inorganic material.

[0168] In this way, the preparation method provided in the embodiment of the present application can encapsulate the light-emitting unit.

[0169] The embodiment of the present application also provides a display device, which includes the display panel 100 of the above embodiment. The display device provided by the present application has the same or similar technical effects as the display panel 100 of the above embodiment, which will not be described in detail here.

[0170] Optionally, the display device can be a mobile phone, a television, a tablet computer, a laptop computer, a desktop computer, a vehicle-mounted display terminal, a wearable device, an advertising display device, etc.

[0171] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A pixel definition layer, wherein the pixel definition layer is located on one side of the substrate along the thickness direction; An isolation structure, the isolation structure is located on a side of the pixel definition layer facing away from the substrate and is adjacent to the pixel definition layer, and the isolation structure encloses and forms a plurality of isolation openings; The isolation structure includes a base portion, a support portion and an eave portion which are stacked in sequence in a direction away from the substrate. The spacing distance between the base portion and the substrate toward the first side surface of the isolation opening gradually increases in the direction toward the isolation opening; in a direction parallel to the substrate, the base portion extends out of the support portion.

2. The display panel according to claim 1, wherein: A concave portion is provided on a side of the pixel definition layer facing away from the substrate, and an orthographic projection of the concave portion on the substrate overlaps with an orthographic projection of the first side surface on the substrate; Preferably, an orthographic projection of the first side surface on the substrate is located within an orthographic projection of the recessed portion on the substrate.

3. The display panel according to claim 1, wherein: The angle between the first side surface and the plane where the substrate is located is θ 2, θ 2< θ 1; Said θ 1 satisfies the following formula: so θ 1=a / b; The distance between the boundary of the orthographic projection of the eaves portion on the substrate and the boundary of the orthographic projection of the base portion on the substrate is equal to b, and the distance between the eaves portion and the base portion in the thickness direction of the substrate is equal to a; Preferably, 45°≤ θ 1≤60°,θ2≤30°.

4. The display panel according to claim 1, wherein: The thickness of the base portion is d, and the value range of d is: 20nm<d≤50nm; Preferably, the value range of d is: 30nm≤d≤50nm; Preferably, the value of d is 25 nm, 30 nm, 35 nm, 40 nm, 45 nm or 50 nm.

5. The display panel according to claim 1 or 2, characterized in that: The display panel further includes a plurality of light-emitting units, each of which includes a light-emitting layer and a first electrode sequentially arranged in a direction away from the substrate, wherein the orthographic projections of the light-emitting layer and the first electrode of the light-emitting unit on the substrate are located within the orthographic projections of the corresponding isolation openings on the substrate; the light-emitting layer includes a first edge, wherein the orthographic projection of the first edge on the substrate overlaps the orthographic projection of the first side surface on the substrate, and the first edge is located on a side of the first side surface facing the substrate; Preferably, the first electrode comprises a second edge, the orthographic projection of the second edge on the substrate overlaps with the orthographic projection of the base portion on the substrate, and the second edge is located on a side of the base portion facing away from the substrate; Preferably, the second edge of the first electrode overlaps the base portion and / or the support portion.

6. The display panel according to claim 5, wherein: The first edge extends into the recessed portion.

7. The display panel according to claim 5, wherein: The light-emitting layer comprises a first film layer, a light-emitting functional layer, and a second film layer which are sequentially stacked in a direction away from the substrate; an edge of the first film layer is the first edge; The first film layer includes a hole transport layer; or, the first film layer includes a hole injection layer and a hole transport layer sequentially arranged in a direction away from the substrate; or, the first film layer includes a hole injection layer, a hole transport layer and an electron blocking layer sequentially arranged in a direction away from the substrate; Preferably, the first edge is spaced apart from the base portion or the first side surface; Preferably, the second film layer comprises an electron transport layer; Preferably, the second film layer comprises an electron transport layer and an electron injection layer sequentially arranged in a direction away from the substrate; Preferably, the second film layer comprises a hole blocking layer, an electron transport layer and an electron injection layer which are sequentially arranged in a direction away from the substrate.

8. The display panel according to claim 1, wherein: The orthographic projection of the first side surface on the substrate is arranged at a distance from the orthographic projection of the support portion on the substrate.

9. The display panel according to claim 1, wherein: The display panel further comprises a second electrode layer, the pixel definition layer comprises a pixel opening, and the orthographic projection of the pixel opening on the substrate is located within the orthographic projection of the isolation opening on the substrate; The second electrode layer is located on one side of the substrate along the thickness direction, the pixel definition layer is partially located on the side of the second electrode layer away from the substrate, the second electrode layer includes a plurality of spaced second electrodes, and the pixel opening exposes a portion of the second electrode.

10. The display panel according to claim 1, wherein: The orthographic projections of the base portion and the support portion on the substrate are located within the orthographic projection of the eaves portion on the substrate.

11. A display panel, characterized in that: include: substrate; A pixel definition layer, located on one side of the substrate along the thickness direction; An isolation structure is located on a side of the pixel definition layer away from the substrate and encloses a plurality of isolation openings; The isolation structure includes a base portion, a support portion and an eaves portion which are stacked in sequence along a direction away from the substrate, the support portion's orthographic projection on the substrate is located within the orthographic projection of the base portion on the substrate, the base portion is adjacent to the pixel definition layer, and there is a gap between the edge of the base portion and the pixel definition layer that connects to the isolation opening.

12. The display panel according to claim 11, wherein: The display panel further comprises a plurality of light-emitting units, wherein the light-emitting units comprise a light-emitting layer and a first electrode which are sequentially arranged in a direction away from the substrate, wherein the light-emitting layer comprises a first edge, and the first edge extends into the gap; Preferably, an edge of the first electrode is located on a side of the base portion facing away from the substrate.

13. The display panel according to claim 12, wherein: The light-emitting layer includes a first film layer, a light-emitting functional layer, and a second film layer stacked in sequence in a direction away from the substrate, and the edge of the first film layer is the first edge; the first film layer includes a hole transport layer; or The first film layer includes a hole injection layer and a hole transport layer arranged in sequence in a direction away from the substrate; or, The first film layer comprises a hole injection layer, a hole transport layer and an electron blocking layer arranged in sequence in a direction away from the substrate; Preferably, the first edge is spaced apart from the base portion; Preferably, the second film layer comprises an electron transport layer; Preferably, the second film layer comprises an electron transport layer and an electron injection layer sequentially arranged in a direction away from the substrate; Preferably, the second film layer comprises a hole blocking layer, an electron transport layer and an electron injection layer which are sequentially arranged in a direction away from the substrate.

14. The display panel according to claim 12, wherein: The spacing distance between the first side surface of the base portion facing the isolation opening and the substrate gradually increases along the direction close to the isolation opening, and the gap is formed between the first side surface and the pixel definition layer; And / or, a concave portion is provided on a side of the pixel definition layer facing away from the substrate, the orthographic projection of the concave portion on the substrate overlaps with the orthographic projection of the base portion on the substrate, and the orthographic projection of the gap on the substrate is located within the orthographic projection of the concave portion on the substrate; Preferably, an orthographic projection of the recessed portion on the substrate does not overlap with an orthographic projection of the supporting portion on the substrate.

15. A method for preparing a display panel, characterized in that: include: providing a substrate; Preparing a pixel definition layer on one side of the substrate along the thickness direction; Preparing an isolation structure on a side of the pixel definition layer facing away from the substrate, and patterning to form a plurality of isolation openings; The isolation structure includes a base portion, a support portion and an eaves portion stacked in sequence in a direction away from the substrate, the base portion is adjacent to the pixel definition layer, and a gap connecting the isolation opening is provided between the edge of the base portion and the pixel definition layer.

16. The preparation method according to claim 15, characterized in that: After preparing a pixel definition layer on one side of the substrate along the thickness direction and before preparing an isolation structure on a side of the pixel definition layer away from the substrate, the preparation method comprises: A recessed portion is prepared on a side of the pixel definition layer facing away from the substrate, the orthographic projection of the recessed portion on the substrate overlaps with the orthographic projection of the base portion on the substrate, and at least a portion of the gap is located in the recessed portion.

17. The preparation method according to claim 15 or 16, characterized in that: The step of preparing an isolation structure on a side of the pixel definition layer away from the substrate and patterning a plurality of isolation openings comprises: Prepare an isolation structure on a side of the pixel definition layer facing away from the substrate; The isolation structure is patterned to form a plurality of the isolation openings and a plurality of the gaps.

18. The preparation method according to claim 16, characterized in that: The spacing distance between the first side surface of the base portion facing the isolation opening and the substrate gradually increases along the direction toward the isolation opening; After preparing an isolation structure on a side of the pixel definition layer facing away from the substrate, the preparation method further comprises: Patterning the pixel definition layer to form a plurality of pixel openings, wherein the orthographic projections of the pixel openings on the substrate are located within the orthographic projections of the corresponding isolation openings on the substrate; A first film layer is prepared by an evaporation process, wherein an evaporation angle of the evaporation process is greater than an angle between the first side surface and the plane where the substrate is located; the first film layer includes a hole transport layer; or, the first film layer includes a hole injection layer and a hole transport layer arranged in sequence along a direction away from the substrate; or, the first film layer includes a hole injection layer, a hole transport layer and an electron blocking layer arranged in sequence along a direction away from the substrate.

19. A display panel, characterized in that: include: substrate; An isolation structure, wherein the isolation structure encloses and forms a plurality of isolation openings; The isolation structure includes a base portion, a support portion and an eave portion which are stacked in sequence along a direction away from the substrate, the base portion includes a first surface close to the substrate and a second surface away from the substrate, the orthographic projection of the first surface on the substrate is located within the orthographic projection area of ​​the second surface on the substrate, and the base portion extends out of the support portion in a direction parallel to the substrate.

20. The display panel according to claim 19, wherein: The base portion further includes a first side surface connecting the first surface and the second surface; a spacing distance between the first side surface and the substrate gradually increases along a direction toward the isolation opening.

Images