Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel and a preparation method thereof and a display device, and relates to the technical field of display, the display panel comprises a substrate, a first pixel definition layer and a filling layer, the first pixel definition layer is arranged on one side of the substrate, and one side, away from the substrate, of the first pixel definition layer is provided with at least one concave part; the filling layer is arranged on the side, away from the substrate, of the first pixel defining layer and comprises at least one filling part, and at least part of the filling part is arranged in at least part of the concave part. 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, relates to a display panel and a preparation method thereof, and a display device. Background Art

[0002] At present, 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. In the preparation process of traditional display panels, the graphicization of luminous pixels is usually achieved through a fine metal mask (FMM). FMM technology is mature and has rich experience in mass production. However, FMM technology also has problems such as limited accuracy, high development cost and long development cycle. The non-fine metal mask technology eliminates the limitations of traditional OLED processes on display size, resolution and other screen performance, and has the advantages of high performance, full-domain size and agile delivery. Patents CN118251982A, CN115666161A, CN116648095A, CN117062489A, CN118678742A, CN118785761A, CN115224220A, CN118678729A, CN118660529A, and CN118660589A record relevant contents of the non-fine metal mask technology for reference.

[0003] However, the performance and process performance of current display devices 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, and a display device, so as to improve the 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 first pixel definition layer and a filling layer, wherein the first pixel definition layer is arranged on one side of the substrate, and at least one recessed portion is provided on the side of the first pixel definition layer facing away from the substrate; the filling layer is arranged on the side of the first pixel definition layer facing away from the substrate, and the filling layer comprises at least one filling portion, and at least part of the filling portion is arranged in at least part of the recessed portion.

[0007] Through the above technical scheme, the display panel provided by the present application sets at least part of the filling part in at least part of the recessed part, which can at least avoid the device on the side of the first pixel definition layer away from the substrate to produce a large recess, thereby at least avoiding the recessed part from affecting the device on the side of the first pixel definition layer away from the substrate to a certain extent, which is beneficial to 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, the display panel provided in the present application also includes an isolation structure, which is located on the side of the filling layer facing away from the substrate and encloses an isolation opening, and the orthographic projection of the surface of the side of the isolation structure facing away from the substrate on the substrate overlaps with the orthographic projection of at least part of the recessed portion on the substrate.

[0010] In this way, the display panel provided by the present application can, at least to a certain extent, avoid the formation of large depressions on the surface of the isolation structure that is away from the substrate, which is beneficial to avoiding the surface of the isolation structure that is away from the substrate from being damaged in subsequent processes and avoiding the intrusion of drug liquid into the interior of the isolation structure. It can be beneficial to improve the overlap effect between the isolation structure and the cathode, thereby improving the display effect.

[0011] Optionally, the orthographic projection of the recessed portion on the substrate is located within the orthographic projection of a surface of the isolation structure facing away from the substrate on the substrate.

[0012] In some embodiments, the isolation structure includes a base portion, a support portion, and an eave portion arranged in sequence along a direction away from the substrate, the orthographic projection of a surface of the side of the support portion facing away from the substrate on the substrate is located within the orthographic projection of a surface of the side of the eave portion facing away from the substrate on the substrate, and the orthographic projection of the surface of the side of the support portion facing away from the substrate on the substrate at least partially overlaps with the orthographic projection of the recessed portion on the substrate.

[0013] In this way, the display panel provided by the present application can, at least to a certain extent, avoid the formation of large depressions on the surface of the isolation structure that is away from the substrate, which is beneficial to avoiding the surface of the isolation structure that is away from the substrate from being damaged in subsequent processes, and avoiding the intrusion of drug liquid into the isolation support part, which can be beneficial to improving the overlap effect between the isolation structure and the cathode, thereby improving the display effect.

[0014] Optionally, the orthographic projection of the recessed portion on the substrate is located within the orthographic projection of a surface of the supporting portion facing away from the substrate on the substrate.

[0015] In some embodiments, along a direction perpendicular to the substrate, a distance between a surface of the filling portion facing away from the substrate and the substrate is L1, and a distance between a surface of the first pixel definition layer facing away from the substrate and the substrate is L2;

[0016] Among them, L1>L2, or, L1=L2, or, L1<L2.

[0017] In some embodiments, the display panel also includes an isolation structure, which includes a base portion, a supporting portion, and an eaves portion arranged in sequence along a direction away from the substrate. Along the direction perpendicular to the substrate, the thickness of the eaves portion is d, the spacing distance between the surface of the filling portion on the side away from the substrate and the substrate is L1, the spacing distance between the surface of the first pixel definition layer on the side away from the substrate and the substrate is L2, the difference between L1 and L2 is c, the ratio of c to d is k, and the value range of k is: 0≤k≤0.15.

[0018] Optionally, the value range of k is: 0≤k≤0.1, or, 0.1≤k≤0.15.

[0019] Optionally, the value of k is one of: 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14 and 0.15.

[0020] Optionally, L1>L2, or, L1=L2, or, L1<L2.

[0021] In some embodiments, the display panel further includes a second pixel definition layer, the second pixel definition layer is located on a side of the filling portion facing away from the substrate, and the orthographic projection of the filling portion on the substrate is located within the orthographic projection of the second pixel definition layer on the substrate.

[0022] Optionally, part of the second pixel definition layer is connected to part of the first pixel definition layer;

[0023] Preferably, the display panel also includes an isolation structure, which is located on the side of the second pixel definition layer facing away from the substrate and encloses an isolation opening, and the orthographic projection of a surface of the isolation structure facing the substrate on the substrate is located within the orthographic projection of the second pixel definition layer on the substrate.

[0024] In this way, the second pixel definition layer can cover the filling portion, thereby improving the protection effect on the isolation structure.

[0025] In some embodiments, the first pixel definition layer and the second pixel definition layer are made of different materials.

[0026] Optionally, the material of the first pixel definition layer includes one of silicon oxide and silicon nitride, and the material of the second pixel definition layer includes the other of silicon oxide and silicon nitride.

[0027] In some embodiments, the display panel provided in the present application also includes a first electrode layer and a flat layer, the flat layer is arranged on one side of the substrate, the first electrode layer is arranged on the side of the flat layer away from the substrate, the first pixel definition layer is arranged on the side of the first electrode layer away from the substrate, the first electrode layer includes a plurality of first electrodes arranged at intervals, and the first pixel definition layer is connected to a portion of the flat layer.

[0028] Optionally, the material of the filling layer is the same as that of the flat layer.

[0029] Optionally, the material of the planar layer includes an organic material.

[0030] Optionally, the material of the planar layer includes polyimide.

[0031] In some embodiments, the orthographic projection of the recessed portion on the substrate is located between the orthographic projections of two adjacent first electrodes on the substrate.

[0032] Optionally, the display panel provided in the present application also includes an isolation structure, which is located on the side of the filling layer facing away from the substrate and encloses an isolation opening, and the orthographic projection of the first electrode on the substrate overlaps with the orthographic projection of the surface of the side of the isolation structure facing away from the substrate on the substrate.

[0033] In some embodiments, the material of the filling layer includes an organic material.

[0034] Optionally, the material of the filling layer includes polyimide.

[0035] In some embodiments, the first pixel definition layer and the second pixel definition layer have a pixel opening, the display panel provided in the present application also includes a light-emitting unit and a first encapsulation layer, the orthographic projection of the light-emitting unit on the substrate is located within the orthographic projection range of the pixel opening on the substrate, the first encapsulation layer is located on the side of the light-emitting unit away from the substrate, the orthographic projection of the light-emitting unit on the substrate is located within the orthographic projection range of the first encapsulation layer on the substrate, and the material of the filling layer is the same as the material of the first encapsulation layer.

[0036] Optionally, the material of the first encapsulation layer includes an inorganic material.

[0037] Optionally, the material of the first encapsulation layer includes one of silicon oxide and silicon nitride.

[0038] In some embodiments, the material of the filling layer includes an inorganic material.

[0039] Optionally, the material of the filling layer includes one of silicon oxide and silicon nitride.

[0040] In a second aspect, the present application provides a method for preparing a display panel, the method comprising:

[0041] providing a substrate;

[0042] A first pixel definition layer is prepared on one side of the substrate, wherein at least one recessed portion is provided on a side of the first pixel definition layer facing away from the substrate;

[0043] A filling layer is prepared on a side of the first pixel definition layer facing away from the substrate, the filling layer comprising at least one filling portion, at least part of which is disposed in at least part of the recessed portion.

[0044] Through the above-mentioned technical scheme, the preparation method provided in the present application can set at least part of the filling part in at least part of the recessed part, which can at least avoid the device on the side of the first pixel definition layer facing away from the substrate to produce a large recess, thereby at least avoiding the recessed part from affecting the device on the side of the first pixel definition layer facing away from the substrate to a certain extent, which is beneficial to improving the performance.

[0045] Therefore, the display panel prepared by the preparation method provided in the present application can improve the performance of the display device.

[0046] In some embodiments, the step of preparing a filling layer on a side of the first pixel definition layer facing away from the substrate comprises:

[0047] forming a filling material on a side of the first pixel definition layer facing away from the substrate, so that the filling material fills the recessed portion;

[0048] At least the filling material other than the recessed portion is removed to form a filling layer.

[0049] Optionally, the filling material comprises an organic material.

[0050] Optionally, the material of the filling layer includes polyimide.

[0051] Optionally, the filling material comprises an inorganic material.

[0052] Optionally, the material of the filling layer includes one of silicon oxide and silicon nitride.

[0053] In some embodiments, after preparing a filling layer on a side of the first pixel definition layer facing away from the substrate, the preparation method provided by the present application further includes:

[0054] A second pixel definition layer is prepared on a side of the filling layer facing away from the substrate to cover the filling layer.

[0055] In some embodiments, before preparing the first pixel definition layer on one side of the substrate, the preparation method provided by the present application further includes:

[0056] A first electrode layer is prepared on one side of the substrate, wherein the first electrode layer includes a plurality of first electrodes arranged at intervals, and an orthographic projection of the recessed portion on the substrate is located between the orthographic projections of two adjacent first electrodes on the substrate.

[0057] In some embodiments, after preparing the second pixel definition layer on the side of the filling layer facing away from the substrate, the preparation method provided by the present application further includes:

[0058] An isolation structure is prepared on the side of the second pixel definition layer facing away from the substrate, wherein the isolation structure encloses an isolation opening, and the orthographic projection of the surface of the isolation structure facing away from the substrate overlaps with the orthographic projection of at least part of the recessed portion on the substrate.

[0059] In a third aspect, the present application provides a display device, including: a display panel of any of the above embodiments, and / or a display panel prepared by a preparation method of any of the above embodiments. The display device provided by the present application has the same or similar technical effects as any of the above display panels, which will not be described in detail here. 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 A partial enlarged view of point A in the middle;

[0063] Figure 3 For along Figure 2 One of the cross-sectional structural diagrams of the middle BB line;

[0064] Figure 4 For along Figure 2 The second cross-sectional structure diagram of the middle BB line;

[0065] Figure 5 For along Figure 2 The third cross-sectional structure diagram of the middle BB line;

[0066] Figure 6 For along Figure 2 The fourth cross-sectional structure diagram of the middle BB line;

[0067] Figure 7 For along Figure 2 Sectional structure diagram of the middle BB line No. 5;

[0068] Figure 8 for Figure 7 A partial enlarged view of point C in the middle;

[0069] Fig. 9 For along Figure 2 Sectional structure diagram of the middle BB line No. 6;

[0070] Fig.10 for Fig. 9 A partial enlarged view of point D in the middle;

[0071] Fig.11 For along Figure 2 Sectional structure diagram of the middle BB line No. 7;

[0072] Fig.12 One of the structural schematic diagrams of the display panel provided in the embodiment of the present application during the preparation process;

[0073] Fig.13 The second structural schematic diagram of the display panel during the preparation process provided by the embodiment of the present application;

[0074] Fig.14 The third structural schematic diagram of the display panel during the preparation process provided by the embodiment of the present application;

[0075] Fig.15 One of the flow diagrams of the preparation method provided in the embodiment of the present application;

[0076] Fig.16 The second schematic diagram of the preparation method provided in the embodiment of the present application;

[0077] Fig.17 A fourth structural schematic diagram of a display panel during the preparation process provided in an embodiment of the present application;

[0078] Fig.18 A fifth structural schematic diagram of a display panel during the preparation process provided in an embodiment of the present application;

[0079] Fig.19 The third flow chart of the preparation method provided in the embodiment of the present application.

[0080] Among them, the reference numerals in the figure are:

[0081] 100-display panel; 10-substrate; 20-flat layer; 30-first electrode; 40-pixel definition layer; 41-first pixel definition layer; 42-filling part; 43-second pixel definition layer; 50-isolation structure; 51-base part; 52-support part; 53-eaves part; 60-light-emitting layer; 70-second electrode; 81-first encapsulation layer; 82-second encapsulation layer; 83-third encapsulation layer. DETAILED DESCRIPTION

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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 .

[0087] The display panel 100 includes a substrate 10 including a display area and a non-display area, the non-display area surrounding at least a portion of the display area.

[0088] The display panel 100 further includes a plurality of light-emitting units, which are located on one side of the substrate 10 along the thickness direction, and the plurality of light-emitting units can be prepared in batches according to the process flow. For example, the plurality of light-emitting units can 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 can emit light of different colors. For example, the first light-emitting unit can emit red light, the second light-emitting unit can emit green light, and the third light-emitting unit can emit blue light.

[0089] It is understandable that the first light-emitting unit, the second light-emitting unit and the third light-emitting unit are sequentially evaporated and patterned. That is, when preparing the display panel 100 provided in the embodiment of the present application, the first light-emitting unit can be firstly evaporated and patterned to form the first light-emitting unit, then evaporated and patterned to form the second light-emitting unit, and finally evaporated and patterned to form the third light-emitting unit.

[0090] In some embodiments, the first light emitting unit, the second light emitting unit, and the third light emitting unit may be patterned using a mask.

[0091] In some embodiments, the display panel 100 further includes a pixel definition layer 40 (Pixel Defined Layer, PDL) and an isolation structure 50, wherein the isolation structure 50 and the pixel definition layer 40 are disposed on the same side of the substrate 10 in the thickness direction, and the isolation structure 50 is disposed on the side of the pixel definition layer 40 away from the substrate 10, and the isolation structure 50 defines a plurality of isolation openings. Among them, the orthographic projection of the light-emitting unit on the substrate 10 can be located within the orthographic projection of the corresponding isolation opening on the substrate 10. Optionally, the pixel definition layer 40 and the isolation structure 50 can be located in the display area AA. It can be understood that the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit can be patterned by the isolation structure 50 instead of the mask. The pixel definition layer 40 has a pixel opening, and the pixel opening is located within the isolation opening.

[0092] The plurality of isolation openings may include a first isolation opening, a second isolation opening, and a third isolation opening, the first light emitting unit corresponds to the first isolation opening, the second light emitting unit corresponds to the second isolation opening, and the third light emitting unit corresponds to the third isolation opening.

[0093] The display panel 100 also includes a first electrode layer, part of which is located between the pixel definition layer 40 and the substrate 10. The first electrode layer includes a plurality of first electrodes 30 spaced apart from each other. The pixel opening is connected to the isolation opening. The pixel opening exposes part of the first electrode 30. The light-emitting layer 60 can pass through the pixel opening to be connected to the first electrode 30.

[0094] It can be understood that the first electrode 30 of the light-emitting unit is located on the side of the pixel definition layer 40 facing the substrate 10, the light-emitting unit includes a light-emitting layer 60 and a second electrode 70 located on the side of the light-emitting layer 60 away from the substrate 10, the light-emitting layer 60 and the second electrode 70 of the light-emitting unit are located in the isolation opening, and the light-emitting layer 60 is located between the first electrode 30 and the second electrode 70.

[0095] Optionally, the first electrode 30 may be an anode, and the second electrode 70 may be a cathode.

[0096] Please also read Figure 3 and Figure 4 The inventors have found that when the first electrode 30 extends below the isolation structure 50 (the orthographic projection of the first electrode 30 on the substrate 10 overlaps with the orthographic projection of the isolation on the substrate 10), the pixel definition layer 40 will have a recessed portion on the side facing away from the substrate 10. In this way, the pixel definition layer 40 has a step difference, that is, there will be areas with different heights on the surface of the pixel definition layer 40 facing away from the substrate 10. For example, the display panel 100 includes a first pixel definition layer 41, which is disposed on one side of the substrate 10, and at least one recessed portion is disposed on the side of the first pixel definition layer 41 facing away from the substrate 10. This will cause the device on the side of the first pixel definition layer 41 facing away from the substrate 10 to also have a recess on the surface on the side facing away from the substrate 10, which will have an adverse effect on the device.

[0097] For example, the device may be an isolation structure 50. When preparing the isolation structure 50, there will be regions with different heights on the surface of the isolation structure 50 facing away from the substrate 10. There will be a connection region on the side of the isolation structure 50 facing away from the substrate 10, and the connection region connects two regions with different heights. When the height difference between the two regions with different heights is greater than a threshold, the connection region is prone to breakage, especially the display panel 100 is prone to breakage in the subsequent etching process and the liquid is prone to invading the isolation structure 50 from the breakage, causing abnormal overlap between the cathode and the isolation structure 50, affecting the light-emitting effect.

[0098] See also Figure 4 In order to solve the above technical problems, an embodiment of the present application provides a display panel 100, which includes a filling layer, which is arranged on the side of the first pixel definition layer 41 away from the substrate 10, and the filling layer includes at least one filling portion 42, and at least part of the filling portion 42 is arranged in at least part of the recessed portion.

[0099] In this way, the display panel 100 provided in the present application sets at least a portion of the filling portion 42 in at least a portion of the recessed portion, which can at least avoid the device (such as the isolation structure 50) on the side of the first pixel definition layer 41 away from the substrate 10 from having a larger recess, thereby at least avoiding the recessed portion from affecting the device on the side of the first pixel definition layer 41 away from the substrate 10 to a certain extent, which is beneficial to improving the performance.

[0100] Therefore, the display panel 100 provided in the present application can improve the performance of the display device.

[0101] Optionally, the filling portion 42 is disposed in the recessed portion.

[0102] Optionally, the partially filled portion 42 is disposed in the recessed portion.

[0103] Optionally, the filling portion 42 is disposed in part of the recessed portion.

[0104] Please continue reading Figure 4 In some embodiments, the isolation structure 50 is located on the side of the filling layer facing away from the substrate 10 and encloses an isolation opening, and the orthographic projection of the surface of the side of the isolation structure 50 facing away from the substrate 10 on the substrate 10 overlaps with the orthographic projection of at least part of the recessed portion on the substrate 10.

[0105] It is understandable that the concave portion of the first pixel definition layer 41 on the side facing away from the substrate 10 will cause a concave portion to also be formed on the surface of the isolation structure 50 on the side facing away from the substrate 10 .

[0106] In this way, the display panel 100 provided in the embodiment of the present application uses the filling portion 42 to fill at least part of the recessed portion, which can at least to a certain extent avoid the formation of a large recess on the surface of the isolation structure 50 that is away from the substrate 10, which is beneficial to avoid the surface of the isolation structure 50 that is away from the substrate 10 from being damaged in subsequent processes and avoid the intrusion of drug solution into the interior of the isolation structure 50, which can be beneficial to improving the overlapping effect between the isolation structure 50 and the cathode, thereby improving the display effect.

[0107] In some embodiments, the isolation structure 50 includes a base portion 51, a support portion 52, and an eaves portion 53 which are arranged in sequence along a direction away from the substrate 10, and the orthographic projection of the side surface of the support portion 52 facing away from the substrate 10 on the substrate 10 is located within the orthographic projection of the side surface of the eaves portion 53 facing away from the substrate 10 on the substrate 10, and the orthographic projection of the side surface of the support portion 52 facing away from the substrate 10 on the substrate 10 at least partially overlaps with the orthographic projection of the recessed portion on the substrate 10.

[0108] It can be understood that the eaves portion 53 is located on the side of the support portion 52 away from the substrate 10, and the second electrode 70 is mainly connected to the support portion 52 and the base portion 51. The recessed portion causes a recess on the side surface of the eaves portion 53 away from the substrate 10, so that the side surface of the eaves portion 53 away from the substrate 10 is easily damaged. For example, the orthographic projection of the recessed portion on the substrate 10 is located within the orthographic projection of the side surface of the isolation structure 50 away from the substrate 10 on the substrate 10. The side wall of the recessed portion will cause different areas with height differences on the side surface of the isolation structure 50 away from the substrate 10, and the transition connection between different areas with height differences is easily damaged by etching. The liquid in the etching process is easy to penetrate the eaves portion 53 and invade the support portion 52, which affects the overlap effect between the support portion 52 and the second electrode 70 (cathode).

[0109] Therefore, the display panel 100 provided in the embodiment of the present application can, at least to a certain extent, avoid the formation of a large depression on the surface of the isolation structure 50 that is away from the substrate 10, which is beneficial to preventing the surface of the eaves portion 53 that is away from the substrate 10 from being damaged in subsequent processes, and preventing the drug solution from passing through the eaves portion 53 and invading the isolation support portion 52, which can be beneficial to improving the overlapping effect between the isolation structure 50 and the cathode (second electrode 70), thereby improving the display effect.

[0110] In some embodiments, along the direction perpendicular to the substrate 10, the thickness of the eave portion 53 is d, the distance between the surface of the filling portion 42 facing away from the substrate 10 and the substrate 10 is L1, the distance between the surface of the first pixel definition layer 41 facing away from the substrate 10 and the substrate 10 is L2, the difference between L1 and L2 is c, the ratio of c to d is k, and the value range of k is: 0≤k≤0.15.

[0111] Optionally, the value range of k is: 0≤k≤0.1, or, 0.1≤k≤0.15.

[0112] Optionally, the value of k is one of: 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14 and 0.15.

[0113] It can be understood that the smaller the value of k is, the less likely it is that the surface of the eave portion 53 on the side facing away from the substrate 10 will break. The value of k is negatively correlated with the thickness d of the eave portion 53, and the value of k is positively correlated with the difference c between L1 and L2. Therefore, the smaller the difference c between L1 and L2 is, the less likely it is that the surface of the eave portion 53 on the side facing away from the substrate 10 will break; the larger the thickness d of the eave portion 53 is, the less likely it is that the surface of the eave portion 53 on the side facing away from the substrate 10 will break.

[0114] Optionally, the value range of d can be: d ≥ 200nm. Optionally, the value range of d can be: d ≥ 250nm. Optionally, the value of d can be: one of 200nm, 250nm, 300nm, 350nm and 400nm. That is, the minimum thickness d of the eaves portion 53 is 200nm, and when the difference c between L1 and L2 is constant, the value of k can be made not greater than the threshold value, which is conducive to avoiding the surface of the eaves portion 53 away from the substrate 10 from breaking.

[0115] Optionally, the value range of c can be: 0≤c≤30nm. Optionally, the value of c can be: 0≤a≤15nm. Optionally, the value of c can be: 15nm≤c≤30nm. Optionally, the value of c can be: one of: 0, 5nm, 10nm, 15nm, 20nm, 25nm and 30nm. That is, the difference c between L1 and L2 is at most 30nm. When the thickness d of the eaves portion 53 is constant, the value of k can be made not greater than the threshold value, which is conducive to avoiding the surface of the eaves portion 53 facing away from the substrate 10 from breaking.

[0116] See also Figure 5 In some embodiments, the display panel 100 provided in the embodiment of the present application further includes a second pixel definition layer 43, which is located on the side of the filling portion 42 facing away from the substrate 10, and the orthographic projection of the filling portion 42 on the substrate 10 is located within the orthographic projection of the second pixel definition layer 43 on the substrate 10.

[0117] Optionally, a portion of the second pixel definition layer 43 is connected to a portion of the first pixel definition layer 41 .

[0118] In this way, the second pixel definition layer 43 can cover the filling portion 42 to prevent water and oxygen from corroding the isolation structure 50 , thereby improving the protection of the isolation structure 50 .

[0119] Optionally, the orthographic projection of the surface of the isolation structure 50 facing the substrate 10 on the substrate 10 is located within the orthographic projection of the second pixel definition layer 43 on the substrate 10. In this way, the second pixel definition layer 43 can block the filling portion 42 and the isolation structure 50, thereby preventing the isolation structure 50 from being corroded by water and oxygen, and improving the protection of the isolation structure 50.

[0120] Optionally, the first pixel definition layer 41 and the second pixel definition layer 43 are made of different materials.

[0121] Optionally, the material of the first pixel definition layer 41 includes one of silicon oxide and silicon nitride, and the material of the second pixel definition layer 43 includes the other of silicon oxide and silicon nitride.

[0122] For example, the material of the first pixel definition layer 41 includes silicon oxide, and the material of the second pixel definition layer 43 includes silicon nitride.

[0123] Please continue reading Figure 4 and Figure 5 In some embodiments, the display panel 100 provided in the embodiment of the present application further includes a first electrode layer and a planar layer 20, the planar layer 20 is arranged on one side of the substrate 10, the first electrode layer is arranged on the side of the planar layer 20 away from the substrate 10, the first pixel definition layer 41 is arranged on the side of the first electrode layer away from the substrate 10, the first electrode layer includes a plurality of first electrodes 30 arranged at intervals, and the first pixel definition layer 41 is connected to a portion of the planar layer 20.

[0124] Optionally, the material of the filling layer is the same as that of the planar layer 20 .

[0125] In this way, the display panel 100 provided in the embodiment of the present application can use the material for preparing the planar layer 20 to prepare the filling layer, which facilitates the preparation of the filling layer.

[0126] Optionally, the material of the planar layer 20 includes an organic material.

[0127] Optionally, the material of the planar layer 20 includes polyimide.

[0128] Optionally, the orthographic projection of the recessed portion on the substrate 10 is located between the orthographic projections of two adjacent first electrodes 30 on the substrate 10 .

[0129] Optionally, the orthographic projection of the first electrode 30 on the substrate 10 overlaps with the orthographic projection of a surface of the isolation structure 50 facing away from the substrate 10 on the substrate 10 .

[0130] It is understandable that, since the first electrode 30 is located on the side of the first pixel definition layer 41 facing the substrate 10 , the surface of the first pixel definition layer 41 facing away from the substrate 10 has an uneven surface, thereby forming a concave portion.

[0131] Optionally, the device that causes the recessed portion on the surface of the first pixel definition layer 41 facing away from the substrate 10 may be other devices besides the first electrode 30 , such as a light shielding layer.

[0132] Optionally, the material of the filling layer includes an organic material. Optionally, the material of the filling layer includes polyimide. Of course, the material of the filling layer can also be other organic materials. It is understandable that the material of the filling layer is an organic material so that the filling can be easily processed and formed.

[0133] See also Figure 6In other embodiments, the material of the filling layer includes an inorganic material. Optionally, the material of the filling layer includes one of silicon oxide and silicon nitride. For example, the material of the filling layer includes silicon oxide. Of course, the material of the filling layer can also be other inorganic materials. It is understood that the material of the filling layer is an inorganic material, which can make the filling layer play a role in isolating water and oxygen, and can play the role of protecting the isolation structure 50.

[0134] See also Figure 7 , Figure 8 , Fig. 9 and Fig.10 In some embodiments, along the direction perpendicular to the substrate 10 , the distance between the filling portion 42 and the substrate 10 is L1, and the distance between the first pixel definition layer 41 and the substrate 10 is L2.

[0135] See also Figure 4 , Figure 5 and Figure 6 In some examples, L1=L2. That is, the filling portion 42 is disposed in the recessed portion, and a surface of the filling portion 42 facing away from the substrate 10 is coplanar or has the same height as a surface of the first pixel definition layer 41 facing away from the substrate 10.

[0136] See also Figure 7 and Figure 8 In some examples, L1>L2. That is, part of the filling portion 42 is disposed in the recessed portion, and the rest of the filling portion 42 protrudes from the recessed portion.

[0137] See also Fig. 9 and Fig.10 In some examples, L1<L2. That is, the filling portion 42 is disposed in a portion of the recessed portion, and the remaining recessed portion is not provided with the filling portion 42.

[0138] It can be understood that although in the case of L1=L2, L1<L2, the device on the side of the first pixel definition layer 41 away from the substrate 10 will have a depression or protrusion on the side away from the substrate 10, but compared with the case where no filling portion 42 is set in the depression, the degree of depression or protrusion is smaller, and the impact on the device is smaller.

[0139] See also Fig.11In some embodiments, the first pixel definition layer 41 and the second pixel definition layer 43 have pixel openings, that is, the pixel openings penetrate the first pixel definition layer 41 and the second pixel definition layer 43. The display panel 100 provided in the embodiment of the present application further includes a first encapsulation layer 81, the orthographic projection of the light-emitting unit on the substrate 10 is located within the orthographic projection range of the pixel opening on the substrate 10, the first encapsulation layer 81 is located on the side of the light-emitting unit away from the substrate 10, the orthographic projection of the light-emitting unit on the substrate 10 is located within the orthographic projection range of the first encapsulation layer 81 on the substrate 10, and the material of the filling layer is the same as that of the first encapsulation layer 81. In this way, the filling layer can be prepared using the material for preparing the first encapsulation layer 81.

[0140] Optionally, the material of the first encapsulation layer 81 includes an inorganic material.

[0141] Optionally, the material of the first encapsulation layer 81 includes one of silicon oxide and silicon nitride.

[0142] Optionally, the first encapsulation layer 81 includes a first encapsulation part, a second encapsulation part and a third encapsulation part, the orthographic projection of the first light-emitting unit on the substrate 10 is located within the orthographic projection of the first encapsulation part on the substrate 10, the orthographic projection of the second light-emitting unit on the substrate 10 is located within the orthographic projection of the second encapsulation part on the substrate 10, and the orthographic projection of the second light-emitting unit on the substrate 10 is located within the range of the orthographic projection of the second encapsulation part on the substrate 10.

[0143] Optionally, see Fig.11 In some embodiments, the display panel 100 provided in the embodiment of the present application may further include a second encapsulation layer 82 and a third encapsulation layer 83, wherein the second encapsulation layer 82 is located on the side of the first encapsulation layer 81 away from the substrate 10, and the third encapsulation layer 83 is located on the side of the second encapsulation layer 82 away from the substrate 10.

[0144] Optionally, the first encapsulation layer 81 may be an inorganic encapsulation layer formed by chemical vapor deposition (CVD) and patterning.

[0145] Optionally, the second encapsulation layer 82 may be made by ink jet printing (IJP).

[0146] Optionally, the third encapsulation layer 83 may be an inorganic encapsulation layer formed by chemical vapor deposition (CVD).

[0147] Optionally, the display panel 100 provided in the present application may further include other film layers, and the other film layers are located on the side of the third encapsulation layer 83 away from the substrate 10. The other film layers may include polarizing films, optically clear adhesives (OCA), and the like.

[0148] Please also read Fig.12 , Fig.13 , Fig.14 , Fig.15 , Fig.16 , Fig.17 , Fig.18 as well as Fig.19 The embodiment of the present application further provides a method for preparing a display panel 100 . The display panel 100 of any of the above embodiments can be prepared by the preparation method of the embodiment of the present application.

[0149] See also Fig.12 , Fig.13 , Fig.14 , Fig.15 and Fig.16 In some embodiments, the preparation method provided in the embodiments of the present application includes:

[0150] S1, providing a substrate 10;

[0151] S2, preparing a first pixel definition layer 41 on one side of the substrate 10, wherein at least one recessed portion is provided on a side of the first pixel definition layer 41 facing away from the substrate 10;

[0152] S3, preparing a filling layer on the side of the first pixel definition layer 41 facing away from the substrate 10, the filling layer comprising at least one filling portion 42, at least part of the filling portion 42 is disposed in at least part of the recessed portion.

[0153] Through the above technical scheme, the preparation method provided in the embodiment of the present application can set at least part of the filling portion 42 in at least part of the recessed portion, which can at least avoid the device (such as the isolation structure 50) on the side of the first pixel definition layer 41 away from the substrate 10 to produce a large recess, thereby at least avoiding the recessed portion to a certain extent to affect the device on the side of the first pixel definition layer 41 away from the substrate 10, which is beneficial to improving the performance.

[0154] Therefore, the display panel 100 prepared by the preparation method provided in the embodiment of the present application can improve the performance of the display device.

[0155] See also Fig.13 , Fig.14 and Fig.16 In some embodiments, in step S3, the step of preparing a filling layer on a side of the first pixel definition layer 41 facing away from the substrate 10 includes:

[0156] S31, forming a filling material 421 on a side of the first pixel definition layer 41 away from the substrate 10, so that the filling material 421 fills the concave portion;

[0157] S32, at least remove the filling material 421 outside the recessed portion to form a filling layer. It is understandable that the preparation method provided in the embodiment of the present application can remove the filling material outside the recessed portion by an etching process. Among them, the preparation method provided in the embodiment of the present application can adjust the rate of the etching process so that at least part of the filling material in the recessed portion and part of the filling material outside the recessed portion will not be etched away.

[0158] Optionally, the filling material comprises an organic material.

[0159] Optionally, the material of the filling layer includes polyimide.

[0160] Optionally, the filling material comprises an inorganic material.

[0161] Optionally, the material of the filling layer includes one of silicon oxide and silicon nitride.

[0162] See also Fig.15 and Fig.17 In some embodiments, after a filling layer is prepared on the side of the first pixel definition layer 41 facing away from the substrate 10, the preparation method provided in the embodiment of the present application further includes:

[0163] S4, a second pixel definition layer 43 is prepared on the side of the filling layer away from the substrate 10 to cover the filling layer. In this way, the second pixel definition layer 43 can cover the filling portion 42, prevent water and oxygen from corroding the isolation structure 50, and improve the protection of the isolation structure 50.

[0164] Please also refer to the figure Fig.15 and Fig.18 In some embodiments, after preparing the second pixel definition layer 43 on the side of the filling layer facing away from the substrate 10, the preparation method provided in the embodiment of the present application further includes:

[0165] S5, preparing an isolation structure 50 on the side of the second pixel definition layer 43 facing away from the substrate 10, wherein the isolation structure 50 encloses an isolation opening, and the orthographic projection of the surface of the side of the isolation structure 50 facing away from the substrate 10 on the substrate 10 overlaps with the orthographic projection of at least part of the recessed portion on the substrate 10.

[0166] In this way, the preparation method provided in the embodiment of the present application utilizes the filling portion 42 to fill at least part of the recessed portion, which can at least to a certain extent avoid the formation of a large recess on the surface of the isolation structure 50 that is away from the substrate 10, which is beneficial to avoid the surface of the isolation structure 50 that is away from the substrate 10 from being damaged in subsequent processes, and avoid the intrusion of drug solution into the interior of the isolation structure 50, which can be beneficial to improving the overlapping effect between the isolation structure 50 and the cathode, thereby improving the display effect.

[0167] It can be understood that when preparing the isolation structure, the preparation method provided in the embodiment of the present application sequentially forms the film layers of the base portion 51, the support portion 52 and the eaves portion 53 on the side of the second pixel definition layer 43 away from the substrate 10, and finally patterns the film layers to form the following structure: Figure 5 , Figure 7 or Fig. 9 The display panel shown.

[0168] In summary, please refer to Fig.18 and Fig.19 , the preparation method provided in the embodiment of the present application comprises:

[0169] S1, providing a substrate 10;

[0170] S2, preparing a flat layer 20 on one side of the substrate 10;

[0171] S3, preparing a first electrode layer on one side of the substrate 10, wherein the first electrode layer is located on a side of the flat layer 20 away from the substrate 10, the first electrode layer includes a plurality of first electrodes 30 arranged at intervals, and an orthographic projection of the recessed portion on the substrate 10 is located between orthographic projections of two adjacent first electrodes 30 on the substrate 10;

[0172] S4, preparing a first pixel definition layer 41 on one side of the substrate 10, wherein at least one recessed portion is provided on a side of the first pixel definition layer 41 facing away from the substrate 10;

[0173] S5, preparing a filling layer on the side of the first pixel definition layer 41 facing away from the substrate 10, the filling layer comprising at least one filling portion 42, at least part of the filling portion 42 is disposed in at least part of the recessed portion;

[0174] S6, preparing a second pixel definition layer 43 on the side of the filling layer facing away from the substrate 10 to cover the filling layer;

[0175] S7, preparing an isolation structure 50 on a side of the second pixel definition layer 43 facing away from the substrate 10;

[0176] S8, preparing a light-emitting unit and a first encapsulation layer 81;

[0177] S9, preparing a second encapsulation layer 82 and a third encapsulation layer 83.

[0178] An embodiment of the present application also provides a display device, which can be a mobile phone, a television, a tablet computer, a laptop computer, a desktop computer, a vehicle-mounted display terminal, a wearable device, an advertising display device, or other products.

[0179] Optionally, the display device provided in the embodiment of the present application includes the display panel 100 of any of the above embodiments. The display device provided in the embodiment of the present application has the same or similar technical effects as the display panel 100 of any of the above embodiments, which will not be described in detail here.

[0180] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A first pixel definition layer is disposed on one side of the substrate, and at least one recessed portion is disposed on a side of the first pixel definition layer away from the substrate; The filling layer is arranged on a side of the first pixel definition layer away from the substrate, and the filling layer includes at least one filling portion, at least part of which is arranged in at least part of the recessed portion.

2. The display panel according to claim 1, wherein: The display panel further includes an isolation structure, the isolation structure is located on a side of the filling layer away from the substrate and encloses an isolation opening, and an orthographic projection of a surface of the isolation structure on the substrate away from the substrate overlaps with an orthographic projection of at least part of the recessed portion on the substrate; Preferably, the orthographic projection of the recessed portion on the substrate is located within the orthographic projection of a surface of a side of the isolation structure facing away from the substrate on the substrate.

3. The display panel according to claim 2, wherein: The isolation structure comprises a base portion, a support portion and an eave portion which are sequentially arranged in a direction away from the substrate, an orthographic projection of a surface of the support portion on one side away from the substrate on the substrate is located within an orthographic projection of a surface of the eave portion on one side away from the substrate on the substrate, and an orthographic projection of a surface of the support portion on one side away from the substrate on the substrate at least partially overlaps with an orthographic projection of the recessed portion on the substrate; Preferably, the orthographic projection of the recessed portion on the substrate is located within the orthographic projection of a surface of a side of the support portion facing away from the substrate on the substrate.

4. The display panel according to claim 1, wherein: Along the direction perpendicular to the substrate, the distance between the surface of the filling portion facing away from the substrate and the substrate is L1, and the distance between the surface of the first pixel definition layer facing away from the substrate and the substrate is L2; Among them, L1>L2, or, L1=L2, or, L1<L2.

5. The display panel according to claim 1, wherein: The display panel further includes an isolation structure, the isolation structure includes a base portion, a support portion and an eave portion sequentially arranged in a direction away from the substrate, the eave portion has a thickness d in a direction perpendicular to the substrate, a distance L1 is provided between a surface of the filling portion on a side away from the substrate and the substrate, a distance L2 is provided between a surface of the first pixel definition layer on a side away from the substrate and the substrate, a difference between L1 and L2 is c, a ratio of c to d is k, and a value range of k is: 0≤k≤0.15; Preferably, the value range of k is: 0≤k≤0.1, or, 0.1≤k≤0.15; Preferably, the value of k is one of: 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14 and 0.15; Preferably, L1>L2, or, L1=L2, or, L1<L2.

6. The display panel according to claim 1, wherein: The display panel further includes a second pixel definition layer, the second pixel definition layer is located on a side of the filling portion away from the substrate, and the orthographic projection of the filling portion on the substrate is located within the orthographic projection of the second pixel definition layer on the substrate; Preferably, part of the second pixel definition layer is connected to part of the first pixel definition layer; Preferably, the display panel also includes an isolation structure, which is located on the side of the second pixel definition layer facing away from the substrate and encloses an isolation opening, and the orthographic projection of a surface of the isolation structure facing the substrate on the substrate is located within the orthographic projection of the second pixel definition layer on the substrate.

7. The display panel according to claim 6, wherein: The first pixel definition layer and the second pixel definition layer are made of different materials; Preferably, the material of the first pixel definition layer includes one of silicon oxide and silicon nitride, and the material of the second pixel definition layer includes the other of silicon oxide and silicon nitride.

8. The display panel according to claim 1, wherein: The display panel further comprises a first electrode layer and a planar layer, wherein the planar layer is arranged on one side of the substrate, the first electrode layer is arranged on a side of the planar layer away from the substrate, the first pixel definition layer is arranged on a side of the first electrode layer away from the substrate, the first electrode layer comprises a plurality of first electrodes arranged at intervals, and the first pixel definition layer is connected to a portion of the planar layer; Preferably, the material of the filling layer is the same as that of the flat layer; Preferably, the material of the planar layer comprises an organic material; Preferably, the material of the planar layer includes polyimide.

9. The display panel according to claim 8, wherein: The orthographic projection of the recessed portion on the substrate is located between the orthographic projections of two adjacent first electrodes on the substrate; Preferably, the display panel further comprises an isolation structure, which is located on a side of the filling layer away from the substrate and encloses an isolation opening, and an orthographic projection of the first electrode on the substrate overlaps with an orthographic projection of a surface of the isolation structure on a side away from the substrate.

10. The display panel according to claim 1, wherein: The material of the filling layer includes organic material; Preferably, the material of the filling layer includes polyimide.

11. The display panel according to claim 6, wherein: The first pixel definition layer and the second pixel definition layer have pixel openings, and the display panel further includes: A light-emitting unit, wherein the orthographic projection of the light-emitting unit on the substrate is located within the orthographic projection range of the pixel opening on the substrate; a first encapsulation layer, wherein the first encapsulation layer is located on a side of the light-emitting unit away from the substrate, the orthographic projection of the light-emitting unit on the substrate is located within the orthographic projection range of the first encapsulation layer on the substrate, and the material of the filling layer is the same as that of the first encapsulation layer; Preferably, the material of the first encapsulation layer comprises an inorganic material; Preferably, the material of the first encapsulation layer includes one of silicon oxide and silicon nitride.

12. The display panel according to claim 1, wherein: The material of the filling layer includes inorganic material; Preferably, the material of the filling layer includes one of silicon oxide and silicon nitride.

13. A method for preparing a display panel, characterized in that: include: providing a substrate; A first pixel definition layer is prepared on one side of the substrate, wherein at least one recessed portion is provided on a side of the first pixel definition layer facing away from the substrate; A filling layer is prepared on a side of the first pixel definition layer facing away from the substrate, wherein the filling layer comprises at least one filling portion, and at least a portion of the filling portion is disposed in at least a portion of the recessed portion.

14. The preparation method according to claim 13, characterized in that: The step of preparing a filling layer on a side of the first pixel definition layer facing away from the substrate comprises: forming a filling material on a side of the first pixel definition layer away from the substrate, so that the filling material fills the recessed portion; removing at least the filling material outside the recessed portion to form the filling layer; Preferably, the filling material comprises an organic material; Preferably, the material of the filling layer includes polyimide; Preferably, the filling material comprises an inorganic material; Preferably, the material of the filling layer includes one of silicon oxide and silicon nitride.

15. The preparation method according to claim 13, characterized in that: After preparing a filling layer on a side of the first pixel definition layer facing away from the substrate, the preparation method further includes: A second pixel definition layer is prepared on a side of the filling layer facing away from the substrate to cover the filling layer.

16. The preparation method according to claim 15, characterized in that: Before preparing the first pixel definition layer on one side of the substrate, the preparation method further includes: A first electrode layer is prepared on one side of the substrate, wherein the first electrode layer includes a plurality of first electrodes arranged at intervals, and the orthographic projection of the recessed portion on the substrate is located between the orthographic projections of two adjacent first electrodes on the substrate.

17. The preparation method according to claim 16, characterized in that: After preparing a second pixel definition layer on a side of the filling layer away from the substrate, the preparation method further comprises: An isolation structure is prepared on the side of the second pixel definition layer facing away from the substrate, wherein the isolation structure encloses an isolation opening, and the orthographic projection of the surface of the side of the isolation structure facing away from the substrate on the substrate overlaps with the orthographic projection of at least part of the recessed portion on the substrate.

18. A display device, characterized in that: include: A display panel as claimed in any one of claims 1 to 12, and / or a display panel prepared by the preparation method as claimed in any one of claims 13 to 17.

Images