Display panel, display device and preparation method of display panel

Abstract

The invention discloses a display panel, a display device and a preparation method of the display panel, the display panel comprises a substrate, a pixel definition layer, an isolation structure and a light emitting unit, the pixel definition layer is arranged on one side of the substrate and comprises a pixel limiting part and a pixel opening defined by the pixel limiting part; the isolation structure is arranged on one side of the substrate and encloses to form an isolation opening, and the isolation opening is communicated with the pixel opening; the light-emitting units are arranged in the pixel openings and comprise a plurality of sub-layers, at least one sub-layer comprises a first part and a second part located on the side, close to the isolation structure, of the first part, and the thickness of the second part is gradually reduced in the direction close to the isolation structure; and the orthographic projection of the second part on the substrate is partially overlapped with the orthographic projection of the pixel opening on the substrate.

Description

Technical Field

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

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

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

[0004] The purpose of the present application is to provide a display panel, a display device and a method for manufacturing a display panel, which can improve the performance of the display panel.

[0005] In a first aspect, the present application provides a display panel, comprising a substrate, a pixel definition layer, an isolation structure and a light-emitting unit, wherein the pixel definition layer is arranged on one side of the substrate and comprises a pixel defining portion and a pixel opening formed by the pixel defining portion; the isolation structure is arranged on one side of the substrate and encloses an isolation opening, and the isolation opening is connected to the pixel opening; the light-emitting unit is arranged in the pixel opening and comprises a plurality of sublayers, at least one sublayer comprises a first part and a second part located on a side of the first part close to the isolation structure, the thickness of the second part gradually decreases toward the isolation structure, and the orthographic projection of the second part on the substrate overlaps with the orthographic projection of the pixel opening on the substrate.

[0006] In some embodiments, the plurality of sub-layers include a light-emitting functional layer and a first electrode stacked on a side of the light-emitting functional layer away from the substrate, and the first electrode includes a first portion and a second portion;

[0007] Preferably, the plurality of sublayers further include a first carrier layer located between the light-emitting functional layer and the first electrode, and the first carrier layer includes a first portion and a second portion;

[0008] Preferably, the light-emitting functional layer comprises a first part and a second part;

[0009] Preferably, the plurality of sublayers further include a second electrode and a second carrier layer located between the second electrode and the light-emitting functional layer, and the second carrier layer includes a first portion and a second portion.

[0010] In some embodiments, the isolation structure includes a first isolation segment and a second isolation segment located at a peripheral side of the isolation opening, the first electrode is connected to the first isolation segment,

[0011] The first electrode is connected to the second isolation segment, or the first electrode is spaced apart from the second isolation segment.

[0012] In some embodiments, the first electrode and the second isolation segment are spaced apart, and the distance from the first isolation segment facing the isolation opening to the pixel opening is smaller than the distance from the second isolation segment facing the corresponding isolation opening to the corresponding pixel opening.

[0013] In some embodiments, the isolation structure includes a first isolation portion and a second isolation portion stacked in a direction away from the substrate, and an orthographic projection of the first isolation portion on the substrate is located within an orthographic projection of the second isolation portion on the substrate;

[0014] Preferably, the isolation structure further includes a third isolation portion, and the third isolation portion is stacked on a side of the first isolation portion facing the substrate.

[0015] In some embodiments, a thickness thinning line is formed between the first portion and the second portion, a vapor deposition edge is formed on a side of the second isolation portion facing the isolation opening, a virtual connection surface is connected between the thickness thinning line and the vapor deposition edge, and an angle θ1 between the virtual connection surface and the thickness direction of the substrate satisfies: 30°≤θ1≤70°;

[0016] Preferably, the distance from the evaporation edge to the side of the pixel defining portion facing away from the substrate is a first distance, and the first distance H1 satisfies: 0.5 micrometers ≤ H1 ≤ 1.5 micrometers.

[0017] In some embodiments, the plurality of sublayers include a light-emitting functional layer and a first electrode stacked on a side of the light-emitting functional layer away from the substrate, the first electrode and the light-emitting functional layer include a first portion and a second portion, respectively, and an angle of the first electrode is greater than or equal to an angle of the light-emitting functional layer;

[0018] Preferably, the angle θ2 of the first electrode satisfies: 55°≤θ2≤70°;

[0019] Preferably, the angle θ3 of the light-emitting functional layer satisfies: 30°≤θ3≤55°.

[0020] In some embodiments, a thickness thinning line is formed between the first portion and the second portion, a distance from the thickness thinning line to the center of the corresponding pixel opening is a second distance, the plurality of light-emitting units include a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit, the second distance of the first light-emitting unit is greater than the second distance of the second light-emitting unit, and the second distance of the second light-emitting unit is greater than the second distance of the third light-emitting unit;

[0021] Preferably, the isolation structure comprises a first isolation portion and a second isolation portion stacked in a direction away from the substrate, the orthographic projection of the first isolation portion on the substrate is located within the orthographic projection of the second isolation portion on the substrate, the second isolation portion comprises a convex sub-portion convex relative to the first isolation portion toward a direction close to the isolation opening, the convex width of the convex sub-portion corresponding to the first light-emitting unit is smaller than the convex width of the convex sub-portion corresponding to the second light-emitting unit, and the convex width of the convex sub-portion corresponding to the second light-emitting unit is smaller than the convex width of the convex sub-portion corresponding to the third light-emitting unit;

[0022] Preferably, a vapor deposition edge is formed on the side of the second isolation portion toward the isolation opening, and a virtual connection surface is connected between the thickness thinning line and the vapor deposition edge. The angle θ1 between the virtual connection surface and the thickness direction of the substrate satisfies: 30°≤θ1≤70°, the angle corresponding to the first light-emitting unit is smaller than the angle corresponding to the second light-emitting unit, and the angle corresponding to the second light-emitting unit is smaller than the angle corresponding to the third light-emitting unit.

[0023] A second aspect of the present application provides a display device, comprising any one of the above display panels.

[0024] A third aspect of the present application provides a method for preparing a display panel, comprising:

[0025] A pixel definition layer is formed on one side of the substrate, wherein the pixel definition layer includes a pixel definition portion and a pixel opening formed by the pixel definition portion;

[0026] An isolation structure is formed on one side of the substrate, the isolation structure encloses an isolation opening, and the isolation opening is connected to the pixel opening;

[0027] A light-emitting unit is formed in the pixel opening, the light-emitting unit includes a plurality of sub-layers, at least one sub-layer includes a first portion and a second portion located on a side of the first portion close to the isolation structure, the thickness of the second portion gradually decreases toward the isolation structure, and the orthographic projection of the second portion on the substrate overlaps with the orthographic projection of the pixel opening on the substrate.

[0028] The embodiments of the present application provide a display panel, a display device and a method for manufacturing a display panel. The display panel includes a substrate, a pixel definition layer, an isolation structure and a light-emitting unit. The pixel definition layer is arranged on one side of the substrate and includes a pixel defining portion and a pixel opening formed by enclosing the pixel defining portion. The isolation structure is arranged on one side of the substrate and encloses to form an isolation opening. The isolation opening is connected to the pixel opening. The light-emitting unit is arranged in the pixel opening and includes a plurality of sublayers. At least one sublayer includes a first portion and a second portion located on a side of the first portion close to the isolation opening. The thickness of the second portion gradually decreases toward the isolation structure. The orthographic projection of the second portion on the substrate overlaps with the orthographic projection of the pixel opening on the substrate, that is, the first portion and part of the second portion of the sublayer are located in the pixel opening. Compared with the orthographic projection of the second portion on the substrate being misaligned with the orthographic projection of the pixel opening on the substrate, the space occupied by the light-emitting unit outside the pixel opening can be reduced, so that the width dimension of the pixel defining portion along the direction parallel to the substrate can be reduced accordingly, thereby reducing the pixel pitch, which is beneficial to improving the PPI of the display panel and improving the performance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application 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 creative work.

[0030] Figure 1 A schematic cross-sectional view of a display panel provided in some embodiments of the present application;

[0031] Figure 2 Another cross-sectional schematic diagram of a display panel provided in some embodiments of the present application;

[0032] Figure 3 A schematic cross-sectional view of a display panel provided in some other embodiments of the present application;

[0033] Figure 4 A schematic cross-sectional view of a display panel provided in some other embodiments of the present application;

[0034] Figure 5 A schematic cross-sectional view of a display panel provided in some further embodiments of the present application;

[0035] Figure 6 Another cross-sectional schematic diagram of a display panel provided in some further embodiments of the present application;

[0036] Figure 7 A cross-sectional schematic diagram of a display panel provided in some embodiments of the present application;

[0037] Figure 8 A flow chart of a method for preparing a display panel provided in some embodiments of the present application.

[0038] The figures are as follows:

[0039] Substrate 10; display panel 100; pixel definition layer 20; pixel defining portion 21; pixel opening 22; isolation structure 30; isolation opening 31; first isolation segment 32; second isolation segment 33; first isolation portion 34; second isolation portion 35; protruding sub-portion 351; third isolation portion 36; light-emitting unit 40; sublayer 41; first portion 411; second portion 412; light-emitting functional layer 42; first electrode 43; second electrode 44; first light-emitting unit 45; second light-emitting unit 46; third light-emitting unit 47; thickness thinning line P1; evaporation edge P2; virtual connection surface P3. DETAILED DESCRIPTION

[0040] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0041] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, 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 cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0042] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0043] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0044] An embodiment of the present application provides a display panel, which may be an organic light emitting diode (OLED) display panel, or other types of display panels, such as a micro light emitting diode (Micro Light Emitting Diode, Micro-LED) or a quantum dot light emitting diode (Quantum Light Emitting Diode, QLED) display panel.

[0045] In some display panels, an isolation structure with isolation openings is provided, so that light-emitting devices of different colors can be formed in different isolation openings by first evaporating the entire layer and then etching. Among them, patent applications PCT / CN2023 / 134518, 202310759370.2, 202310740412.8, 202310707209.0, and 202311346196.5 record relevant technical solutions of the isolation structure, and their contents are incorporated into this application by reference for reference.

[0046] See also Figure 1 In a first aspect, the present application provides a display panel 100, comprising a substrate 10, a pixel definition layer 20, an isolation structure 30 and a light-emitting unit 40, wherein the pixel definition layer 20 is disposed on one side of the substrate 10 and comprises a pixel defining portion 21 and a pixel opening 22 enclosed by the pixel defining portion 21; the isolation structure 30 is disposed on one side of the substrate 10 and encloses an isolation opening 31, and the isolation opening 31 is connected to the pixel opening 22; the light-emitting unit 40 is disposed in the pixel opening 22 and comprises a plurality of sub-layers 41, at least one sub-layer 41 comprises a first portion 411 and a second portion 412 located on a side of the first portion 411 close to the isolation structure 30, the thickness of the second portion 412 gradually decreases in a direction close to the isolation structure 30, and the orthographic projection of the second portion 412 on the substrate 10 partially overlaps with the orthographic projection of the pixel opening 22 on the substrate 10.

[0047] Specifically, the substrate 10 includes a substrate and a driving circuit layer arranged on the substrate. The substrate can be a hard substrate made of materials such as glass or plastic, or a flexible substrate made of materials such as polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyarylate, polyimide (PI), polycarbonate (PC) or cellulose acetate propionate (CAP). A driving circuit for controlling the light emission of the light emitting unit 40 is arranged in the driving circuit layer. The driving circuit layer is generally composed of inorganic film layers such as a metal layer, a semiconductor layer (active layer), and an insulating layer. By patterning these inorganic film layers, a driving circuit for controlling the light emission of the light emitting unit 40 can be formed. There are many implementation methods for its specific circuit structure, which will not be repeated here.

[0048] The pixel definition layer 20 is arranged on one side of the substrate 10, and includes a pixel defining portion 21 and a pixel opening 22 formed by the pixel defining portion 21. The light-emitting unit 40 is arranged in the pixel opening 22, so that the light-emitting display of the display panel 100 can be realized. In addition, the number of the light-emitting unit 40 and the pixel opening 22 can be multiple, and the multiple light-emitting units 40 are arranged one-to-one in the multiple pixel openings 22, which can reduce the carrier crosstalk in each light-emitting unit 40 and improve the display effect of the display panel 100. The isolation structure 30 is arranged on one side of the substrate 10, and the isolation opening 31 is formed by the isolation opening 31. The isolation opening 31 is connected with the pixel opening 22, which can reduce the shielding of the pixel opening 22 by the isolation structure 30, and ensure the light-emitting effect of the light-emitting unit 40. In addition, the light-emitting material can be separated by the isolation structure 30 to form the light-emitting unit 40, so that the light-emitting unit 40 is located in the isolation opening 31, and no mask is required to prepare the light-emitting unit 40, which can save costs.

[0049] The light-emitting unit 40 may include a plurality of sub-layers 41, and the plurality of sub-layers 41 are stacked in sequence along the thickness direction of the substrate 10, wherein at least one of the plurality of sub-layers 41 includes a first part 411 and a second part 412, and the second part 412 is located on a side of the first part 411 close to the isolation structure 30, that is, the first part 411 is arranged close to the center, and the second part 412 is arranged close to the edge, and the second part 412 can be arranged around the circumference of the first part 411. It can be understood that, subject to the preparation process of the light-emitting unit 40, the thickness of the first part 411 can be roughly uniformly set, and the thickness of the second part 412 gradually decreases in the direction approaching the isolation structure 30, that is, the second part 412 gradually becomes thinner in the direction approaching the isolation structure 30. In the related art, the second part 412 is usually located on the side of the pixel defining portion 21 away from the substrate 10, that is, outside the pixel opening 22, thereby occupying a larger space outside the pixel opening 22, so that the width dimension of the pixel defining portion 21 along the direction parallel to the substrate 10 is larger, and the distance between two adjacent pixels is larger, which is difficult to meet the high PPI requirements of the display panel 100.

[0050] Therefore, in the embodiment of the present application, by setting the orthographic projection of the second part 412 on the substrate 10 to partially overlap with the orthographic projection of the pixel opening 22 on the substrate 10, that is, the first part 411 of the sub-layer 41 and part of the second part 412 are located in the pixel opening 22, compared with setting the orthographic projection of the second part 412 on the substrate 10 to be misaligned with the orthographic projection of the pixel opening 22 on the substrate 10, the space occupied by the light-emitting unit 40 outside the pixel opening 22 can be reduced, so that the width dimension of the pixel defining portion 21 along the direction parallel to the substrate 10 can be correspondingly reduced, thereby reducing the pixel pitch, which is beneficial to improving the PPI of the display panel 100 and improving the performance of the display panel 100.

[0051] See also Figure 2 In some embodiments, the plurality of sub-layers 41 include a light-emitting functional layer 42 and a first electrode 43 stacked on a side of the light-emitting functional layer 42 away from the substrate 10 , and the first electrode 43 includes a first portion 411 and a second portion 412 .

[0052] In these embodiments, the first electrode 43 includes a first portion 411 and a second portion 412, that is, the orthographic projection of the second portion 412 of the first electrode 43 on the substrate 10 partially overlaps with the orthographic projection of the pixel opening 22 on the substrate 10, and the first portion 411 of the first electrode 43 and part of the second portion 412 are located in the pixel opening 22, thereby reducing the space occupied by the first electrode 43 outside the pixel opening 22, which is beneficial to improving the PPI of the display panel 100.

[0053] Preferably, the multiple sublayers 41 also include a first carrier layer located between the light-emitting functional layer 42 and the first electrode 43, and the first carrier layer includes a first part 411 and a second part 412, that is, the orthographic projection of the second part 412 of the first carrier layer on the substrate 10 partially overlaps with the orthographic projection of the pixel opening 22 on the substrate 10, and the first part 411 and part of the second part 412 of the first carrier layer are located in the pixel opening 22, thereby reducing the space occupied by the first carrier layer outside the pixel opening 22, further meeting the high PPI requirement of the display panel 100.

[0054] Please continue reading Figure 2 Preferably, the light-emitting functional layer 42 includes a first part 411 and a second part 412, that is, the orthographic projection of the second part 412 of the light-emitting functional layer 42 on the substrate 10 partially overlaps with the orthographic projection of the pixel opening 22 on the substrate 10, and the first part 411 of the light-emitting functional layer 42 and part of the second part 412 are located in the pixel opening 22, thereby reducing the space occupied by the light-emitting functional layer 42 outside the pixel opening 22, further meeting the high PPI requirements of the display panel 100.

[0055] Preferably, the multiple sublayers 41 also include a second electrode 44 and a second carrier layer located between the second electrode 44 and the light-emitting functional layer 42, the second carrier layer includes a first part 411 and a second part 412, that is, the orthographic projection of the second part 412 of the second carrier layer on the substrate 10 partially overlaps with the orthographic projection of the pixel opening 22 on the substrate 10, and the first part 411 and part of the second part 412 of the second carrier layer are located in the pixel opening 22, thereby reducing the space occupied by the second carrier layer outside the pixel opening 22, further meeting the high PPI requirement of the display panel 100.

[0056] It should be noted that, in the present application, one of the first electrode 43 and the second electrode 44 can be used as the anode of the light-emitting unit 40, and the other can be used as the cathode of the light-emitting unit 40. The embodiment of the present application takes the first electrode 43 as the cathode of the light-emitting unit 40 and the second electrode 44 as the anode of the light-emitting unit 40 as an example. The first carrier layer and the second carrier layer can be formed by stacking multiple film layers. For example, the first carrier layer can include a stacked electron injection layer (Electron Inject Layer, EIL) and an electron transport layer (Electron Transport Layer, ETL), and the second carrier layer can include a stacked hole injection layer (Hole Inject Layer, HIL) and a hole transport layer (Hole Transport Layer, HTL).

[0057] See also Figure 1 and Figure 3In some embodiments, the isolation structure 30 includes a first isolation segment 32 and a second isolation segment 33 located on the peripheral side of the isolation opening 31, and the first electrode 43 is connected to the first isolation segment 32, wherein the first electrode 43 is connected to the second isolation segment 33, or the first electrode 43 and the second isolation segment 33 are spaced apart.

[0058] Specifically, the isolation structure 30 can be arranged around the circumference of the isolation opening 31, and the isolation structure 30 includes a first isolation segment 32 and a second isolation segment 33. The first isolation segment 32 and the second isolation segment 33 can be connected end to end, or the number of the first isolation segment 32 and the second isolation segment 33 can be multiple, and the multiple first isolation segments 32 and the multiple second isolation segments 33 are alternately arranged along the circumference of the isolation opening 31. This embodiment is not limited to this.

[0059] In these embodiments, the first electrode 43 is connected to the first isolation segment 32, so that the first electrodes 43 of the plurality of light-emitting units 40 can be electrically connected through the isolation structure 30 to form a whole-surface electrode to ensure that the light-emitting units 40 emit light normally. The first electrode 43 is connected to the second isolation segment 33, so that the contact area between the first electrode 43 and the isolation structure 30 can be increased and the impedance between the two can be reduced. Alternatively, the first electrode 43 and the second isolation segment 33 are arranged at intervals, so that the width of the second isolation segment 33 can be reduced to a certain extent, which is conducive to meeting the high PPI requirements of the display panel 100.

[0060] In some embodiments, the first electrode 43 is spaced apart from the second isolation segment 33, and a distance from the first isolation segment 32 facing the isolation opening 31 to the pixel opening 22 is smaller than a distance from the second isolation segment 33 facing the corresponding isolation opening 31 to the corresponding pixel opening 22, so that a width of the second isolation segment 33 is smaller than a width of the first isolation segment 32, which is beneficial for meeting the high PPI requirements of the display panel 100.

[0061] See also Figure 4 In some embodiments, the isolation structure 30 includes a first isolation portion 34 and a second isolation portion 35 stacked in a direction away from the substrate 10 , and the orthographic projection of the first isolation portion 34 on the substrate 10 is located within the orthographic projection of the second isolation portion 35 on the substrate 10 .

[0062] In these embodiments, the second isolation portion 35 is arranged on the side of the first isolation portion 34 facing away from the substrate 10, and the orthographic projection of the first isolation portion 34 on the substrate 10 is located within the orthographic projection of the second isolation portion 35 on the substrate 10, thereby ensuring that the second isolation portion 35 can separate the luminescent material to form the light-emitting unit 40, so that the light-emitting unit 40 is located in the isolation opening 31, and no mask is required to prepare the light-emitting unit 40, thereby saving costs.

[0063] Please continue reading Figure 4 Preferably, the isolation structure 30 also includes a third isolation portion 36, which is stacked on the side of the first isolation portion 34 facing the substrate 10, so that the height of the isolation structure 30 can be increased, which is equivalent to making the isolation opening 31 have a larger height difference. When preparing the light-emitting unit 40, due to the larger height difference at the isolation opening 31, the light-emitting material is easier to disconnect at the isolation structure 30, thereby reducing the difficulty of preparing the light-emitting unit 40.

[0064] See also Figure 5 In some embodiments, a thickness thinning line P1 is formed between the first portion 411 and the second portion 412, a vapor deposition edge P2 is formed on the side of the second isolation portion 35 facing the isolation opening 31, and a virtual connection surface P3 is connected between the thickness thinning line P1 and the vapor deposition edge P2. An angle θ1 between the virtual connection surface P3 and the thickness direction of the substrate 10 satisfies: 30°≤θ1≤70°.

[0065] Specifically, the thickness thinning line P1 is the boundary line between the first part 411 and the second part 412, and the thickness of the sublayer 41 including the first part 411 and the second part 412 gradually decreases from the thickness thinning line P1 in the direction close to the isolation structure 30. In the preparation process of the light-emitting unit 40, the second isolation part 35 can be used as a mask to isolate the light-emitting material so that the light-emitting material falls into the pixel opening 22 to form the light-emitting unit 40. Therefore, the edge of the second isolation part 35 facing the isolation opening 31 is the evaporation edge P2. It should be noted that the second isolation part 35 may include a first surface facing the substrate 10 and a second surface facing away from the substrate 10. When the orthographic projection of the first surface on the substrate 10 is located within the orthographic projection of the second surface on the substrate 10, the evaporation edge P2 may be the edge of the second surface close to the isolation opening 31. When the orthographic projection of the second surface on the substrate 10 is located within the orthographic projection of the first surface on the substrate 10, the evaporation edge P2 may be the edge of the first surface close to the isolation opening 31.

[0066] In these embodiments, a virtual connection surface P3 is connected between the thickness thinning line P1 and the evaporation edge P2. By reasonably setting the angle between the virtual connection surface P3 and the thickness direction of the substrate 10, that is, reasonably setting the evaporation angle of the light-emitting unit 40, when the distance from the evaporation edge P2 to the side of the pixel defining portion 21 away from the substrate 10 is constant, the orthographic projection of the second portion 412 of at least one sublayer 41 in the light-emitting unit 40 on the substrate 10 overlaps with the orthographic projection of the pixel opening 22 on the substrate 10.

[0067] It should be noted that the angle between the virtual connection plane P3 and the thickness direction of the substrate 10 can be greater than or equal to 30° and less than or equal to 70°. For example, the angle can be 30°, 40°, 50°, 60°, 70°, etc.

[0068] Please continue reading Figure 5 Preferably, the distance from the evaporation edge P2 to the side of the pixel defining portion 21 facing away from the substrate 10 is a first distance H1, and the first distance H1 satisfies: 0.5 microns ≤ H1 ≤ 1.5 microns, so that by reasonably adjusting the angle between the virtual connection surface P3 and the thickness direction of the substrate 10, the orthographic projection of the second portion 412 of at least one sublayer 41 in the light-emitting unit 40 on the substrate 10 overlaps with the orthographic projection of the pixel opening 22 on the substrate 10.

[0069] It should be noted that the first distance H1 can be greater than or equal to 0.5 microns and less than or equal to 1.5 microns. For example, the first distance H1 can be 0.5 microns, 0.6 microns, 0.7 microns, 0.8 microns, 0.9 microns, 1.2 microns, 1.3 microns, 1.4 microns, 1.5 microns, etc.

[0070] In some embodiments, the plurality of sublayers 41 include a light-emitting functional layer 42 and a first electrode 43 stacked on the side of the light-emitting functional layer 42 facing away from the substrate 10, the first electrode 43 and the light-emitting functional layer 42 respectively include a first part 411 and a second part 412, and the angle of the first electrode 43 is greater than or equal to the angle of the light-emitting functional layer 42, so that by reasonably setting the angle of the first electrode 43 and the angle of the light-emitting functional layer 42, the orthographic projection of the second part 412 of the first electrode 43 on the substrate 10 overlaps with the orthographic projection of the pixel opening 22 on the substrate 10, and the orthographic projection of the light-emitting functional layer 42 on the substrate 10 overlaps with the orthographic projection of the pixel opening 22 on the substrate 10.

[0071] Please continue reading Figure 5 Preferably, the angle θ2 of the first electrode 43 satisfies: 55°≤θ2≤70°, so as to reasonably set the angle of the first electrode 43. The angle of the first electrode 43 may be greater than or equal to 55° and less than or equal to 70°. For example, the angle of the first electrode 43 may be 55°, 60°, 62°, 65°, 67°, 70°, etc.

[0072] See also Figure 6 Preferably, the angle θ3 of the light-emitting functional layer 42 satisfies: 30°≤θ3≤55°, so as to reasonably set the angle of the light-emitting functional layer 42. The angle of the light-emitting functional layer 42 may be greater than or equal to 30° and less than or equal to 55°. For example, the angle of the light-emitting functional layer 42 may be 30°, 35°, 40°, 45°, 50°, 55°, etc.

[0073] See also Figure 7 In some embodiments, a thickness thinning line P1 is formed between the first portion 411 and the second portion 412, and a distance from the thickness thinning line P1 to the center of the corresponding pixel opening 22 is a second distance H2. The plurality of light-emitting units 40 include a first light-emitting unit 45, a second light-emitting unit 46, and a third light-emitting unit 47. The second distance H2 of the first light-emitting unit 45 is greater than the second distance H2 of the second light-emitting unit 46, and the second distance H2 of the second light-emitting unit 46 is greater than the second distance H2 of the third light-emitting unit 47.

[0074] Specifically, during the preparation of the light-emitting unit 40, the first light-emitting unit 45 can be prepared before the second light-emitting unit 46, and the second light-emitting unit 46 can be prepared before the third light-emitting unit 47, that is, the first light-emitting unit 45, the second light-emitting unit 46 and the third light-emitting unit 47 are prepared in sequence.

[0075] The second distance H2 of the first light-emitting unit 45 is greater than the second distance H2 of the second light-emitting unit 46, and the second distance H2 of the second light-emitting unit 46 is greater than the second distance H2 of the third light-emitting unit 47, that is, the size of the second portion 412 of the second light-emitting unit 46 located in the pixel opening 22 is greater than the size of the second portion 412 of the first light-emitting unit 45 located in the pixel opening 22, and the size of the second portion 412 of the third light-emitting unit 47 located in the pixel opening 22 is greater than the size of the second portion 412 of the second light-emitting unit 46 located in the pixel opening 22. In other words, the second portion 412 of the pixel opening 22 corresponding to the second light-emitting unit 46 is greater than the second portion 412 of the pixel opening 22 corresponding to the first light-emitting unit 45. The second part 412 of the pixel opening 22 corresponding to the third light-emitting unit 47 is larger than the second part 412 of the pixel opening 22 corresponding to the second light-emitting unit 46, so that the space outside the pixel opening 22 occupied by the third light-emitting unit 47 is smaller than the space outside the pixel opening 22 occupied by the second light-emitting unit 46, and the space outside the pixel opening 22 occupied by the second light-emitting unit 46 is smaller than the space outside the pixel opening 22 occupied by the first light-emitting unit 45, thereby realizing the adjustment of the width size of the pixel defining portion 21 corresponding to different light-emitting units 40, that is, adjusting the pixel spacing between different light-emitting units 40, so as to meet the high PPI requirement of the display panel 100 on the basis of ensuring the performance of the display panel 100.

[0076] Please continue reading Figure 7Preferably, the isolation structure 30 includes a first isolation portion 34 and a second isolation portion 35 stacked in a direction away from the substrate 10, the orthographic projection of the first isolation portion 34 on the substrate 10 is located within the orthographic projection of the second isolation portion 35 on the substrate 10, the second isolation portion 35 includes a protruding sub-portion 351 protruding in a direction close to the isolation opening 31 relative to the first isolation portion 34, the protruding width of the protruding sub-portion 351 corresponding to the first light-emitting unit 45 is smaller than the protruding width of the protruding sub-portion 351 corresponding to the second light-emitting unit 46, and the protruding width of the protruding sub-portion 351 corresponding to the second light-emitting unit 46 is smaller than the protruding width of the protruding sub-portion 351 corresponding to the third light-emitting unit 47, thereby ensuring that the second distance H2 of the first light-emitting unit 45 is greater than the second distance H2 of the second light-emitting unit 46, and the second distance H2 of the second light-emitting unit 46 is greater than the second distance H2 of the third light-emitting unit 47, thereby reducing the requirements for the evaporation angle in the preparation process of the light-emitting unit 40, that is, reducing the process difficulty.

[0077] Please continue reading Figure 7 Preferably, a vapor deposition edge P2 is formed on the side of the second isolation portion 35 facing the isolation opening 31, and a virtual connection surface P3 is connected between the thickness thinning line P1 and the vapor deposition edge P2. The angle θ1 between the virtual connection surface P3 and the thickness direction of the substrate 10 satisfies: 30°≤θ1≤70°, the angle corresponding to the first light-emitting unit 45 is smaller than the angle corresponding to the second light-emitting unit 46, and the angle corresponding to the second light-emitting unit 46 is smaller than the angle corresponding to the third light-emitting unit 47, so that the second distance H2 of the first light-emitting unit 40 is greater than the second distance H2 of the second light-emitting unit 46, and the second distance H2 of the second light-emitting unit 46 is greater than the second distance H2 of the third light-emitting unit 47.

[0078] A second aspect of the present application provides a display device, comprising the display panel 100 of any one of the above items.

[0079] In a second aspect, the present application provides a display device, including the display panel 100 of any of the above embodiments or the display panel 100 prepared by the above preparation method. Since the display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0080] The display device may be any device with a display function, for example, a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc. It may also be a non-mobile device such as a personal computer (PC), a television (TV), a teller machine, or an automated machine.

[0081] See also Figure 8 According to a third aspect of the present application, there is provided a method for preparing a display panel 100, comprising:

[0082] S1, forming a pixel definition layer 20 on one side of the substrate 10, wherein the pixel definition layer 20 includes a pixel definition portion 21 and a pixel opening 22 formed by the pixel definition portion 21;

[0083] S2, forming an isolation structure 30 on one side of the substrate 10, the isolation structure 30 encloses an isolation opening 31, and the isolation opening 31 is connected to the pixel opening 22;

[0084] S3. A light-emitting unit 40 is formed in the pixel opening 22. The light-emitting unit 40 includes a plurality of sub-layers 41. At least one sub-layer 41 includes a first portion 411 and a second portion 412 located on a side of the first portion 411 close to the isolation structure 30. The thickness of the second portion 412 gradually decreases toward the isolation structure 30. The orthographic projection of the second portion 412 on the substrate 10 partially overlaps with the orthographic projection of the pixel opening 22 on the substrate 10.

[0085] Through the preparation method of the embodiment of the present application, a pixel definition layer 20 is formed on one side of the substrate 10, and the pixel definition layer 20 includes a pixel definition portion 21 and a pixel opening 22 formed by the pixel definition portion 21, so that by forming a light-emitting unit 40 in the pixel opening 22, the carrier crosstalk in each light-emitting unit 40 can be reduced, and the light-emitting display of the display panel 100 can be achieved. In addition, an isolation structure 30 is formed on one side of the substrate 10, and the isolation structure 30 encloses an isolation opening 31, and the isolation opening 31 is connected to the pixel opening 22, so that the light-emitting material is isolated by the isolation structure 30, and the light-emitting unit 40 is prepared without a mask, which can save costs. Furthermore, the light-emitting unit 40 includes a plurality of sub-layers 41, at least one of the sub-layers 41 includes a first portion 411 and a second portion 412 located on the side of the first portion 411 close to the isolation structure 30, the thickness of the second portion 412 gradually decreases toward the isolation structure 30, and the orthographic projection of the second portion 412 on the substrate 10 partially overlaps with the orthographic projection of the pixel opening 22 on the substrate 10, that is, the first portion 411 of the sub-layer 41 and part of the second portion 412 are located in the pixel opening 22. Compared with setting the orthographic projection of the second portion 412 on the substrate 10 and the orthographic projection of the pixel opening 22 on the substrate 10 to be misaligned, the space occupied by the light-emitting unit 40 outside the pixel opening 22 can be reduced, so that the width dimension of the pixel defining portion 21 along the direction parallel to the substrate 10 can be correspondingly reduced, thereby reducing the pixel pitch, which is beneficial to improving the PPI of the display panel 100 and improving the performance of the display panel 100.

[0086] Although the embodiments disclosed in this application are as above, the contents described are only embodiments adopted for facilitating the understanding of this application and are not intended to limit the present invention. Any technician in the technical field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of protection of this application shall still be subject to the scope defined in the attached claims.

[0087] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the replacement of other connection methods described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements 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 is disposed on one side of the substrate and includes a pixel defining portion and a pixel opening formed by the pixel defining portion; An isolation structure is disposed on one side of the substrate and encloses an isolation opening, wherein the isolation opening is connected to the pixel opening; A light-emitting unit is arranged in the pixel opening and includes a plurality of sublayers, at least one of the sublayers includes a first portion and a second portion located on a side of the first portion close to the isolation structure, the thickness of the second portion gradually decreases toward the isolation structure, and the orthographic projection of the second portion on the substrate overlaps with the orthographic projection of the pixel opening on the substrate.

2. The display panel according to claim 1, characterized in that: The plurality of sub-layers include a light-emitting functional layer and a first electrode stacked on a side of the light-emitting functional layer away from the substrate, and the first electrode includes the first portion and the second portion.

3. The display panel according to claim 2, characterized in that: The plurality of sublayers further include a first carrier layer located between the light-emitting functional layer and the first electrode, wherein the first carrier layer includes the first portion and the second portion; Preferably, the light-emitting functional layer includes the first part and the second part; Preferably, the plurality of sub-layers further include a second electrode and a second carrier layer located between the second electrode and the light-emitting functional layer, and the second carrier layer includes the first portion and the second portion.

4. The display panel according to claim 2, characterized in that: The isolation structure includes a first isolation segment and a second isolation segment located at a peripheral side of the isolation opening, the first electrode is connected to the first isolation segment, The first electrode is connected to the second isolation segment, or the first electrode is spaced apart from the second isolation segment.

5. The display panel according to claim 4, characterized in that: The first electrode and the second isolation segment are spaced apart, and a distance from a side of the first isolation segment facing the isolation opening to the pixel opening is smaller than a distance from a side of the second isolation segment facing the corresponding isolation opening to the corresponding pixel opening.

6. The display panel according to claim 1, characterized in that: The isolation structure comprises a first isolation portion and a second isolation portion stacked in a direction away from the substrate, wherein an orthographic projection of the first isolation portion on the substrate is located within an orthographic projection of the second isolation portion on the substrate; Preferably, the isolation structure further includes a third isolation portion, and the third isolation portion is stacked on a side of the first isolation portion facing the substrate.

7. The display panel according to claim 6, characterized in that: A thickness reduction line is formed between the first part and the second part, a vapor deposition edge is formed on a side of the second isolation portion facing the isolation opening, a virtual connection surface is connected between the thickness reduction line and the vapor deposition edge, and an angle θ1 between the virtual connection surface and the thickness direction of the substrate satisfies: 30°≤θ1≤70°; Preferably, a distance from the evaporation edge to a side of the pixel defining portion facing away from the substrate is a first distance, and the first distance H1 satisfies: 0.5 micrometers ≤ H1 ≤ 1.5 micrometers.

8. The display panel according to claim 7, characterized in that: The plurality of sub-layers include a light-emitting functional layer and a first electrode stacked on a side of the light-emitting functional layer away from the substrate, the first electrode and the light-emitting functional layer include the first portion and the second portion respectively, and the included angle of the first electrode is greater than or equal to the included angle of the light-emitting functional layer; Preferably, the angle θ2 of the first electrode satisfies: 55°≤θ2≤70°; Preferably, the angle θ3 of the light-emitting functional layer satisfies: 30°≤θ3≤55°.

9. The display panel according to any one of claims 1 to 8, characterized in that: A thickness thinning line is formed between the first part and the second part, and the distance from the thickness thinning line to the center of the corresponding pixel opening is a second distance. The multiple light-emitting units include a first light-emitting unit, a second light-emitting unit and a third light-emitting unit. The second distance of the first light-emitting unit is greater than the second distance of the second light-emitting unit, and the second distance of the second light-emitting unit is greater than the second distance of the third light-emitting unit.

10. The display panel according to claim 9, characterized in that: The isolation structure includes a first isolation portion and a second isolation portion stacked in a direction away from the substrate, the orthographic projection of the first isolation portion on the substrate is located within the orthographic projection of the second isolation portion on the substrate, the second isolation portion includes a protruding sub-portion protruding in a direction close to the isolation opening relative to the first isolation portion, the protruding width of the protruding sub-portion corresponding to the first light-emitting unit is smaller than the protruding width of the protruding sub-portion corresponding to the second light-emitting unit, and the protruding width of the protruding sub-portion corresponding to the second light-emitting unit is smaller than the protruding width of the protruding sub-portion corresponding to the third light-emitting unit.

11. The display panel according to claim 10, characterized in that: The second isolation portion forms a vapor deposition edge on the side facing the isolation opening, and a virtual connection surface is connected between the thickness thinning line and the vapor deposition edge. The angle θ1 between the virtual connection surface and the thickness direction of the substrate satisfies: 30°≤θ1≤70°, the angle corresponding to the first light-emitting unit is smaller than the angle corresponding to the second light-emitting unit, and the angle corresponding to the second light-emitting unit is smaller than the angle corresponding to the third light-emitting unit.

12. A display device, characterized in that: A display panel comprising any one of claims 1 to 8.

13. A method for preparing a display panel, characterized in that: include: A pixel definition layer is formed on one side of the substrate, wherein the pixel definition layer includes a pixel definition portion and a pixel opening formed by the pixel definition portion; An isolation structure is formed on one side of the substrate, wherein the isolation structure encloses an isolation opening, and the isolation opening is connected to the pixel opening; A light-emitting unit is formed in the pixel opening, and the light-emitting unit includes a plurality of sub-layers, at least one of the sub-layers includes a first portion and a second portion located on a side of the first portion close to the isolation structure, the thickness of the second portion gradually decreases toward the isolation structure, and the orthographic projection of the second portion on the substrate overlaps with the orthographic projection of the pixel opening on the substrate.

14. The method for preparing a display panel according to claim 13, characterized in that: The plurality of sub-layers include a light-emitting functional layer and a first electrode stacked on a side of the light-emitting functional layer away from the substrate, and the first electrode includes the first portion and the second portion.

15. The method for preparing a display panel according to claim 14, characterized in that: The plurality of sublayers further include a first carrier layer located between the light-emitting functional layer and the first electrode, wherein the first carrier layer includes the first portion and the second portion; Preferably, the light-emitting functional layer includes the first part and the second part; Preferably, the plurality of sub-layers further include a second electrode and a second carrier layer located between the second electrode and the light-emitting functional layer, and the second carrier layer includes the first portion and the second portion.

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