Display panel

Abstract

This disclosure provides a display panel and a display device, the display panel comprising a substrate, an isolation structure located on the substrate, a first sealing layer, and a plurality of light-emitting units. The isolation structure has a plurality of isolation openings defining each of the light-emitting units, and the first sealing layer covers the isolation openings and the light-emitting units. The density of the first sealing layer gradually decreases from the side of the first sealing layer facing the substrate to the side away from the substrate. This solution can improve the flatness of the etched surface of the first sealing layer, thereby more effectively protecting the first sealing layer in the manufacturing process of the display panel.

Description

Technical Field

[0001] This application claims the priority of Chinese Patent Application No. 202410364382.X, titled "Display Panel and Display Device", filed on March 27, 2024, and all the contents of this application are incorporated herein by reference.

[0002] The present disclosure relates to the field of display technology, and specifically, to display panels and display devices. [[ID=ll]]

Background Art

[0003] An organic light-emitting diode (OLED, Organic Light-Emitting Diode) is an organic thin-film electroluminescence unit, which has advantages such as a simple manufacturing process, low cost, low power consumption, high brightness, wide viewing angle, high contrast, and the ability to achieve flexible display, so it has attracted people's attention and is widely applied to electronic display products.

[0004] However, current electronic display products are restricted by the design of their own structures, and it is difficult to further improve the display effect of the display panel.

Summary of the Invention

Means for Solving the Problems

[0005] The first aspect of the present disclosure provides a display panel, which includes a substrate, an isolation structure located on the substrate, a first encapsulation layer, and a plurality of light-emitting units. The isolation structure has a plurality of isolation openings that respectively define the light-emitting units, and the first encapsulation layer covers the isolation openings and the light-emitting units. The density of the first encapsulation layer gradually decreases from the side facing the substrate of the first encapsulation layer towards the side away from the substrate.

[0006] The above solution controls the density distribution of the first sealing layer, thereby forming a relatively inclined surface on the side surface of the first sealing layer, making it easier to deposit a protective layer in subsequent processes. Furthermore, this solution can improve the flatness of the etched surface of the first sealing layer, thereby more effectively protecting the first sealing layer in the manufacturing process of the display panel.

[0007] In one embodiment of a first aspect of the present disclosure, the first sealing layer includes a plurality of sealing units, each corresponding to a light-emitting unit.

[0008] Selectively, the first sealing layer is an inorganic layer.

[0009] Selectively, the edges of the sealing unit extend to the side facing away from the substrate of the isolation structure, and the portion of the sealing unit located on the side facing away from the substrate of the isolation structure separates from the isolation structure and forms an overhang.

[0010] Selectively, the light-emitting unit corresponds one-to-one with the sealing unit.

[0011] In one embodiment of a first aspect of the present disclosure, the sealing unit includes a first main surface facing the substrate and / or isolation structure, a second main surface facing away from the substrate and / or isolation structure, and a side surface connecting the first main surface and the second main surface, wherein the side surface of the sealing unit is a smooth surface.

[0012] In one embodiment of a first aspect of the present disclosure, the side surface of the sealing unit is planar, and the surface on which the side surface of the sealing unit is located intersects with and is not perpendicular to the surface on which the substrate is located.

[0013] In one embodiment of a first aspect of the present disclosure, the display panel further includes a pixel definition layer located between a substrate and an isolation structure, the pixel definition layer defining a plurality of pixel apertures corresponding to isolation apertures, the orthographic projections of the pixel apertures located within the orthographic projections of the corresponding isolation apertures on the substrate, and the light-emitting functional layer and second electrodes filling the pixel apertures and extending to the surface of the pixel definition layer facing away from the substrate.

[0014] Selectively, the pixel definition layer may be an inorganic layer.

[0015] In one embodiment of the first aspect of this disclosure, the density of the pixel definition layer gradually decreases from the side of the pixel definition layer facing the substrate toward the side away from the substrate. This improves the flatness of the side surface of the pixel aperture and ensures the continuity of the second electrode on that side surface.

[0016] Selectively, the second surface of the pixel definition layer is a smooth surface.

[0017] Selectively, the second surface of the pixel definition layer is planar, and the surface on which the second surface of the pixel definition layer is located intersects with and is not perpendicular to the surface on which the substrate is located.

[0018] In one embodiment of a first aspect of the present disclosure, the isolation structure includes a support portion and a crown portion located on the side of the support portion that is backward from the substrate, wherein on the substrate, the orthographic projection of the support portion lies inside the orthographic projection of the crown portion, and on the substrate, the edge of the orthographic projection of the crown portion is the edge of the orthographic projection of the isolation structure.

[0019] In one embodiment of a first aspect of the present disclosure, the light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode sequentially stacked on a substrate, wherein the light-emitting functional layer and the second electrode of each light-emitting unit are located within corresponding isolation apertures.

[0020] In one embodiment of a first aspect of the present disclosure, the display panel further includes a pixel definition layer located between a substrate and an isolation structure, the pixel definition layer defining a plurality of pixel apertures, the pixel apertures being positioned in correspondence with isolation apertures.

[0021] Selectively, the light-emitting functional layer and the second electrode fill the pixel aperture and extend to the surface facing away from the substrate of the pixel definition layer.

[0022] Selectively, the support portion has a conductive structure, and the second electrode of the light-emitting unit is electrically connected to the support portion.

[0023] In one embodiment of the first aspect of the present disclosure, the isolation structure may further include an auxiliary support portion located between the support portion and the pixel defining layer. On the substrate, the orthographic projection of the auxiliary support portion is located inside the orthographic projection of the crown portion, and on the substrate, the orthographic projection of the support portion is located inside the orthographic projection of the auxiliary support portion.

[0024] Optionally, the auxiliary support portion is a conductive structure, and the second electrode of the light-emitting unit is electrically connected to the auxiliary support portion.

[0025] Optionally, the display panel further includes a second encapsulation layer and a third encapsulation layer that cover the first encapsulation layer, the isolation structure, and the light-transmissive shielding layer, and the second encapsulation layer is located between the first encapsulation layer and the third encapsulation layer.

[0026] Optionally, the second encapsulation layer is an organic layer, and the third encapsulation layer is an inorganic layer.

[0027] Optionally, the second encapsulation layer is a planarization layer.

[0028] In one embodiment of the first aspect of the present disclosure, the encapsulation unit includes a first main surface facing the substrate and / or the isolation structure, a second main surface facing away from the substrate and / or the isolation structure, and a side surface connecting the first main surface and the second main surface. The side surface includes a plurality of sub-side surfaces sequentially connected along the direction from the first main surface to the second main surface. The planes determined by the boundaries between the side surface and the first main surface and between the side surface and the second main surface have an included angle of 45 degrees or less with respect to each sub-side surface. On the substrate, the orthographic projection of the second main surface is located inside the orthographic projection of the first main surface.

[0029] In one embodiment of the first aspect of the present disclosure, the refractive index of the first encapsulation layer gradually decreases from the side facing the substrate of the first encapsulation layer to the side away from the substrate.

[0030] In one embodiment of the first aspect of the present disclosure, the oxygen content of the first encapsulation layer gradually increases from the side facing the substrate of the first encapsulation layer to the side away from the substrate.

[0031] A second aspect of the present disclosure provides a display panel comprising a substrate, an isolation structure located on the substrate, a first sealing layer, and a plurality of light-emitting units. The isolation structure has a plurality of isolation openings defining each of the light-emitting units, and the first sealing layer covers the isolation openings and the light-emitting units and includes a plurality of sealing units corresponding to each of the light-emitting units, each sealing unit including a first main surface facing the substrate and / or the isolation structure, a second main surface facing away from the substrate and / or the isolation structure, and a side surface connecting the first main surface and the second main surface. The side surface includes a plurality of sub-side surfaces sequentially connected along the direction from the first main surface to the second main surface, and the planes determined by the boundary between the side surface and the first main surface and the boundary between the side surface and the second main surface have an angle with respect to the respective sub-side surface of 45 degrees or less, and on the substrate, the orthographic projection of the second main surface is located inside the orthographic projection of the first main surface.

[0032] In one embodiment of a second aspect of the present disclosure, the surface on which the side surface of the sealing unit is located intersects and is not perpendicular to the surface on which the substrate is located. Optionally, the sealing unit includes a first principal surface facing the substrate and / or isolation structure, a second principal surface facing away from the substrate and / or isolation structure, and a side surface connecting the first principal surface and the second principal surface, the side surface being a smooth surface. Optionally, the side surface of the sealing unit is planar, and the surface on which the side surface of the sealing unit is located intersects and is not perpendicular to the surface on which the substrate is located.

[0033] In one embodiment of a second aspect of the present disclosure, the density of the first encapsulating layer gradually decreases from the side of the first encapsulating layer facing the substrate to the side away from the substrate, or the first encapsulating layer includes at least two sub-encapsulating layers stacked on top of each other, wherein the refractive index of the sub-encapsulating layer is greater the smaller the distance from the substrate.

[0034] In one embodiment of a second aspect of the present disclosure, the encapsulation unit includes a first sub-encapsulation layer, a second sub-encapsulation layer, and a third sub-encapsulation layer stacked on top of each other, wherein the first sub-encapsulation layer, the second sub-encapsulation layer, and the third sub-encapsulation layer are sequentially installed along a direction away from the substrate, and the first sub-encapsulation layer, the second sub-encapsulation layer, and the third sub-encapsulation layer have a progressively decreasing density or a progressively decreasing refractive index.

[0035] A third aspect of the present disclosure provides a display panel comprising a substrate, an isolation structure located on the substrate, a first sealing layer, and a plurality of light-emitting units. The isolation structure has a plurality of isolation openings defining each of the light-emitting units, and the first sealing layer comprises at least two sub-sealing layers that cover the isolation openings and the light-emitting units and are stacked on top of each other, with the refractive index of the sub-sealing layer being smaller in distance from the substrate.

[0036] The above solution allows for the control of the density of different sub-sealing layers by controlling the refractive index of the different sub-sealing layers, thereby improving the flatness of the etched surface (side surface, described later) of the first sealing layer. This allows the first sealing layer to be more effectively protected during the manufacturing process of the display panel.

[0037] In one embodiment of a third aspect of this disclosure, the density of the sub-sealing layer increases as the distance to the substrate decreases.

[0038] In one embodiment of a third aspect of this disclosure, the oxygen content is lower for sub-sealing layers that are closer to the substrate.

[0039] In one embodiment of a third aspect of the present disclosure, the first sealing layer includes a plurality of sealing units, each corresponding to a light-emitting unit.

[0040] In one embodiment of a third aspect of the present disclosure, the first sealing layer is an inorganic layer.

[0041] In one embodiment of a third aspect of the present disclosure, the edge of the sealing unit extends to the side facing away from the substrate of the isolation structure, and the portion of the sealing unit located on the side facing away from the substrate of the isolation structure is separated from the isolation structure and constitutes an overhang portion.

[0042] In one embodiment of a third aspect of the present disclosure, the isolation structure includes a support portion and a crown portion located on the side of the support portion that is backward from the substrate, wherein on the substrate, the orthographic projection of the support portion lies inside the orthographic projection of the crown portion, and on the substrate, the edge of the orthographic projection of the crown portion is the edge of the orthographic projection of the isolation structure.

[0043] In one embodiment of a third aspect of the present disclosure, the light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode sequentially stacked on a substrate, wherein the light-emitting functional layer and the second electrode of each light-emitting unit are located within corresponding isolation apertures.

[0044] In one embodiment of a third aspect of the present disclosure, the display panel may further include a pixel definition layer located between the substrate and the isolation structure, the pixel definition layer defining a plurality of pixel apertures corresponding to isolation apertures, wherein on the substrate, the orthographic projections of the pixel apertures are located within the orthographic projections of the corresponding isolation apertures, and the light-emitting functional layer and the second electrode fill the pixel apertures and extend to the substrate-facing surface of the pixel definition layer.

[0045] In one embodiment of a third aspect of this disclosure, the pixel definition layer is an inorganic layer.

[0046] In one embodiment of a third aspect of the present disclosure, the pixel definition layer includes at least two sub-definition layers stacked on top of each other, wherein the sub-definition layer has a higher refractive index the closer it is to the substrate.

[0047] In one embodiment of a third aspect of this disclosure, the density of the sub-definition layer is higher the shorter the distance to the substrate.

[0048] In one embodiment of a third aspect of the present disclosure, the second side surface of the pixel definition layer is a smooth surface.

[0049] In one embodiment of a third aspect of the present disclosure, the second surface of the pixel definition layer is planar, and the surface on which the second surface of the pixel definition layer is located intersects with and is not perpendicular to the surface on which the substrate is located. [Brief explanation of the drawing]

[0050] [Figure 1] This is a schematic diagram of the planar structure of a display panel according to one embodiment of the present disclosure. [Figure 2] This is an enlarged view of area S1 of the display panel shown in Figure 1. [Figure 3] Figure 2 is a cross-sectional view of the MN of the display panel. [Figure 4] Figure 3 is a magnified view of a portion of the display panel shown. [Figure 5] This is an enlarged view of a portion of another display panel according to one embodiment of the present disclosure. [Figure 6] This is a cross-sectional view of a display panel according to one embodiment of the present disclosure. [Figure 7] This is a cross-sectional view of a display panel according to one embodiment of the present disclosure. [Figure 8] (A) to (D) are process diagrams of a manufacturing method for forming the display panel shown in Figure 6, according to one embodiment of the present disclosure. [Figure 9] This is a schematic diagram showing the positional relationship between a part of a display panel according to one embodiment of the present disclosure and the deposition source during deposition. [Figure 10] This is a cross-sectional view of a portion of a display panel according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0051] Hereinafter, the technical solutions in the embodiments of this specification will be clearly and completely described with reference to the drawings in the embodiments of this specification. Needless to say, these embodiments are only a selection of embodiments of this specification, not all embodiments. Those skilled in the art will also know that all other embodiments obtained without creative work based on the embodiments of this specification are also covered by this specification.

[0052] In display products, several functional layers in the light-emitting unit are formed by vapor deposition. Each light-emitting unit has multiple types of functional layers, and the materials of several functional layers (e.g., light-emitting layers) in light-emitting units that emit different light are different. Therefore, when vapor-depositing these functional layers using a mask plate (e.g., a fine mask plate), multiple alignments are required. To solve the misalignment problem caused by alignment accuracy errors, it is necessary to ensure sufficient space (safety margin related to alignment errors) between different light-emitting units and to guarantee that the actual position of the light-emitting area of ​​the light-emitting unit has a certain degree of overlap with the design position (design area). This is equivalent to compressing the design area of ​​the light-emitting area of ​​the light-emitting unit, which not only limits the light-emitting area of ​​the light-emitting unit but also prevents further increase in the array density of the light-emitting units, making it difficult to further improve the PPI (pixel density) of the display panel.

[0053] In this disclosure, an isolation structure is installed in the gap between light-emitting units to isolate the functional layers of adjacent light-emitting units. This eliminates the need to individually manufacture the functional layers of each light-emitting unit using mask plates, as the entire surface of the display panel can be deposited during the deposition process. In this process, there is no need to consider the alignment accuracy problem during deposition, so the gap between light-emitting units can be made smaller, increasing the PPI (Platelet Perimeter). (The principle can be found in the relevant explanation in the embodiments shown in Figures 8(A) to 8(D) below.)

[0054] Furthermore, when manufacturing light-emitting units using an isolation structure, the light-emitting units are manufactured in batches according to different light-emitting colors. Therefore, after the manufacturing of the previous batch of light-emitting units is completed, a sealing structure (the first sealing layer below) is formed on top of them to protect them and reduce the damage that the manufacturing process for subsequent batches of light-emitting units will inflict on the light-emitting units of the previous batch. Correspondingly, the sealing structure is also formed in multiple stages, and the sealing effect of the sealing structure directly affects the manufacturing yield of the light-emitting units. During the formation process of the sealing structure, when manufacturing subsequent batches of light-emitting units, some layers (for example, the second electrode below) cover and protect the light-emitting units of the previous batch and the sealing structure (the sealing unit below) on top of them. If the flatness of the surface of the sealing structure is not high, these layers will be of poor quality and will not be able to effectively protect the sealing structure underneath. As a result, the sealing structure may be damaged in subsequent manufacturing processes, such as the etching process, and ultimately the display panel sealing will be defective.

[0055] Some embodiments of this disclosure provide a display panel that solves at least the above technical problems. The display panel includes a substrate, an isolation structure located on the substrate, a first sealing layer, and a plurality of light-emitting units. The isolation structure has a plurality of isolation openings that define each of the light-emitting units, and the first sealing layer covers the isolation openings and the light-emitting units. The density of the first sealing layer gradually decreases from the side of the first sealing layer facing the substrate to the side away from the substrate. By controlling the density distribution of the first sealing layer in this way, a relatively inclined surface can be formed on the side surface of the first sealing layer, making it easier to deposit a protective layer in a subsequent process. Furthermore, this solution can improve the flatness of the etched surface of the first sealing layer, thereby improving the film deposition quality of the protective layer covering the first sealing layer during the manufacturing process of the display panel, and more effectively protecting the first sealing layer during the manufacturing process of the display panel.

[0056] For reference, PCT / CN2023 / 134518, CN116583155B, CN202310759370.2, CN202311117143.6, CN202310771071.0, CN202310771124.9, CN202311499823.9, CN202310771124.9, CN202311451935.7, and CN202311124845.7 contain relevant information on isolation structures.

[0057] In the embodiments of this disclosure, the density of a layer may refer to the tightness of the internal molecules or atoms of the corresponding manufactured material. Density is an important performance indicator for evaluating materials and directly affects the material's mechanical, thermal, and electrical properties. Generally, higher density results in fewer voids and defects within the layer and tighter bonding between atoms or molecules, thus improving the layer's tensile strength, compressive strength, flexural strength, and corrosion resistance. In the same type of material structure, higher density materials have fewer internal voids or less doped low-density material than lower density materials.

[0058] Furthermore, the density of molecules or atoms within a layer is reflected in the refractive index of the layer; that is, the greater the density of molecules or atoms, the greater the refractive index of the layer. In the embodiments of this disclosure, the refractive index of the layer can be measured using an instrument such as an ellipsometer. For example, the measurement principle of an ellipsometer is to generally obtain the thickness and refractive index of the sample surface film by illiterately polarized light being incident on the sample surface and observing the change in the polarization state (amplitude and phase) of the reflected light.

[0059] The measurement procedure for an ellipsometer generally follows steps S1 to S6.

[0060] In S1, the ellipsometer is calibrated. Specifically, the ellipsometer needs to be calibrated before measurement in order to accurately measure the refractive index of the sample. The calibration method typically involves two steps: zero bias adjustment and proportional adjustment.

[0061] In step S2, prepare the sample. Specifically, place the sample to be measured on the sample stage of the ellipsometer.

[0062] In S3, the phase difference is measured. Specifically, the meter parameters are adjusted so that the ellipsometer outputs the minimum signal, and here the ellipsometer measures the phase difference of the sample, which is proportional to the refractive index of the sample.

[0063] In S4, the refractive index is calculated. Specifically, the refractive index of the sample is calculated based on the measured phase difference, according to the operating principle of the ellipsometer.

[0064] In S5, multiple measurements are taken and the average value is calculated. Specifically, to improve the accuracy of the measurement results, it is usually necessary to take multiple measurements and calculate the average value. When taking multiple measurements, care must be taken to maintain the stability of the sample and avoid interference from external factors.

[0065] In S6, environmental conditions are controlled. Specifically, since temperature and humidity have a certain effect on the refractive index of the sample, it is necessary to control and stabilize the environmental conditions during measurement.

[0066] The structure of the display panel in at least one embodiment of this disclosure will be described in detail below with reference to the drawings. In these drawings, a spatial orthogonal coordinate system is constructed with respect to the substrate to more intuitively represent the positional relationships of the related structures in the display panel. In this spatial orthogonal coordinate system, the X and Y axes are parallel to the plane on which the substrate is located, and the Z axis is perpendicular to the plane on which the substrate is located.

[0067] As shown in Figures 1 to 4, the planar area of ​​the display panel 10 may be divided into a display area 11 and a frame area 12 surrounding the display area 11. Subpixels (which may also be called secondary pixels, etc.), such as R, G, and B subpixels, may be arranged within the display area 11. The physical structure of these subpixels may be light-emitting units, and adjacent subpixels with different emitted light colors constitute one pixel (which may also be called a pixel unit, large pixel, etc.). The arrangement density of these pixels in the display area 11 represents the pixel density PPI. In some embodiments of this disclosure, some wiring in the frame area 12 may be arranged into the display area 11 so that the frame area 12 can be designed as a single-sided frame.

[0068] The physical structure of the display panel 10 includes a substrate 100, a display function layer located on the substrate 100, an isolation structure 300, and a first sealing layer 410, the display function layer including a plurality of light-emitting units 200.

[0069] The isolation structure 300 is located on the substrate 100 and defines a plurality of isolation openings 301. That is, the planar shape of the isolation structure 300 is a grid pattern, and the isolation openings 301 are the mesh of the grid pattern. In some embodiments of this application, the isolation openings 300 correspond one-to-one with the light-emitting units 200.

[0070] The first sealing layer 410 covers the isolation opening 301 and the light-emitting unit 200, and the density of the first sealing layer 410 gradually decreases from the side facing the substrate 100 toward the side away from the substrate 100. Note that the direction of the first sealing layer 410 from the side facing the substrate 100 toward the side away from the substrate 100 may be understood as the direction from the surface on which the deposition of the first sealing layer 410 begins toward the surface on which it is completed.

[0071] The statement that the density of the first sealing layer gradually decreases can be understood as the density of the first sealing layer exhibiting a continuous change, at least macroscopically. For example, in one case, the density of the first sealing layer always changes continuously. Alternatively, in another case, the first sealing layer is divided into multiple first and second sections arranged alternately along the thickness direction, where the density changes continuously in each first section and remains constant in each second section, but the number of first and second sections is sufficiently large to cause the density of the first sealing layer to exhibit a continuous change macroscopically.

[0072] In embodiments of this disclosure, the deposition rate of the first encapsulating layer can be controlled by controlling the input power of the equipment during the process of depositing the first encapsulating layer (e.g., a CVD process). When the input power is high, the density of the first encapsulating layer is high, while when the input power is low, the density of the first encapsulating layer is low. Thus, by controlling the input power, the density change of each part of the first encapsulating layer can be controlled. In embodiments of this disclosure, when the density of the first encapsulating layer is high, the refractive index becomes lower, and correspondingly, when the density of the first encapsulating layer is low, the refractive index becomes higher. That is, the refractive index of the first encapsulating layer gradually decreases from the side of the first encapsulating layer facing the isolation structure and / or substrate toward the side away from the separation structure and / or substrate.

[0073] In at least one embodiment of the present disclosure, as shown in Figure 3, the display panel may further include a first sealing layer 410, the first sealing layer 410 including a plurality of sealing units 411 that correspond one-to-one with isolation openings 301, the sealing units 411 covering the corresponding isolation openings 301, and accordingly, the sealing units 411 correspond one-to-one with light-emitting units 200. The reason why the first sealing layer 410 is composed of a plurality of sealing units 411 relates to the principle by which the light-emitting units 200 are manufactured based on the isolation structure 300, and specifically, refer to the explanation relating to the embodiments shown in Figures 8(A) to (D) below, which will be omitted here.

[0074] In at least one embodiment of the present disclosure, as shown in Figures 3 and 4, the sealing unit 411 may extend to the side of the isolation structure 300 facing away from the substrate 100, with consideration to improving the sealing effect, and the principle thereof can be found in the relevant explanation in the embodiments shown in Figures 8(A) to 8(D) below. In this case, the portion of the sealing unit 411 that overlaps with the upper surface of the isolation structure 300 (the side of the crown portion facing away from the substrate below) is formed as an overhang portion 411a so as to be separated from the crown portion 320.

[0075] In some embodiments of the present disclosure, as shown in Figures 3 and 4, the sealing unit 411 includes a first main surface 4111 facing the substrate 100 and / or isolation structure 300, a second main surface 4112 facing away from the substrate 100 and / or isolation structure 300, and a side surface 4113 connecting the first main surface 4111 and the second main surface 4112, wherein the side surface 4113 of the sealing unit 411 is at least macroscopically smooth. The first main surface 4111 is the bottom surface of the sealing unit 411, i.e., the starting surface when forming the first sealing layer 410, the second main surface 4112 is the top surface of the sealing unit 411, i.e., the ending surface when forming the first sealing layer 410, and the side surface 4113 of the sealing unit 411 is actually also the side surface 4113 of the overhang portion 411a. When the density of the first sealing layer 410 gradually changes, the side surface 4113 of the sealing unit 411 is formed by etching during the manufacturing process of the sealing unit 411. During this etching process, the side surface 4113 of the sealing unit 411 does not experience abrupt changes in etching due to differences in density gradients, and therefore the etched side surface 4113 becomes smooth.

[0076] In the embodiments of this disclosure, "smooth surface" means that, in a direction perpendicular to the substrate, the inclination of each point on a line cut from the surface changes continuously (there are no mutations, i.e., it is mathematically differentiable).

[0077] In at least one embodiment of the present disclosure, as shown in Figures 3 and 4, the side surface of the sealing unit 411 is planar, and the surface on which the side surface of the sealing unit 411 is located intersects with and is not perpendicular to the surface on which the substrate 100 is located. In this way, the side wall of the sealing unit 411 has a certain slope, which facilitates the deposition of a protective layer (for example, formed in the same layer as the light-emitting functional layer and the second electrode described below) on the side surface during the manufacturing process of subsequent light-emitting units 200 (which are not covered by the sealing unit 411 in subsequent batches).

[0078] Other embodiments of the present disclosure provide a display panel comprising a substrate, an isolation structure located on the substrate, a first sealing layer, and a plurality of light-emitting units. The isolation structure has a plurality of isolation openings defining each of the light-emitting units, and the first sealing layer covers the isolation openings and the light-emitting units. Other structures other than the first sealing layer can be described in the relevant descriptions of the above embodiments, where the first sealing layer may be designed as a multilayer structure, the principle being substantially the same as the solution (gradual change in density) mentioned in the above embodiments. The first sealing layer comprises at least two sub-sealing layers stacked on top of each other, the sub-sealing layers having a higher refractive index as their distance from the substrate decreases. For example, as shown in Figure 5, the encapsulation unit 411 (or first encapsulation layer 410) includes a first sub-encapsulation layer T1, a second sub-encapsulation layer T2, and a third sub-encapsulation layer T3 stacked on top of each other. The first sub-encapsulation layer T1, the second sub-encapsulation layer T2, and the third sub-encapsulation layer T3 are sequentially installed along the direction away from the substrate. In the formation process of the encapsulation unit 411, the refractive index of the first sub-encapsulation layer T1, the second sub-encapsulation layer T2, and the third sub-encapsulation layer T3 is sequentially reduced (or the density is sequentially reduced) by different process conditions in order to form inclined sides. The refractive index of the first sub-encapsulation layer T1, the second sub-encapsulation layer T2, and the third sub-encapsulation layer T3 may remain constant or gradually change. In the latter case, the refractive index of each sub-encapsulation layer is greater closer to the substrate. The higher the refractive index of the sub-encapsulation layer, the greater its density. In this way, by controlling the refractive index of different sub-sealing layers, the density of the different sub-sealing layers can be controlled, thereby improving the flatness of the etched surface of the first sealing layer 410, and thus the first sealing layer 410 is more effectively protected in the display panel manufacturing process.

[0079] In at least one embodiment of this disclosure, the oxygen content is lower for sub-encapsulation layers that are closer to the substrate.

[0080] In the embodiments of this disclosure, the specific structural design of isolation structures, light-emitting units, etc., is not limited and can be designed according to the needs of the actual process. The following describes, in part, several specific embodiments, illustrative examples of how these structures can be installed.

[0081] In at least one embodiment of the present disclosure, a side surface includes a plurality of sub-side surfaces that are sequentially connected along the direction from a first main surface to a second main surface, and the planes determined by the boundary between the side surface and the first main surface and the boundary between the side surface and the second main surface have an angle of 45 degrees or less with respect to each sub-side surface, and in the substrate, the orthographic projection of the second main surface lies inside the orthographic projection of the first main surface. For example, as shown in Figure 5, the side surfaces of the first sub-sealing layer T1, the second sub-sealing layer T2, and the third sub-sealing layer T3 correspond to the above sub-side surfaces, respectively.

[0082] In at least one embodiment of this disclosure, referring again to Figure 4, the isolation structure 300 may include a support portion 310 facing the substrate 100 and a crown portion 320 facing away from the substrate 100, and on the substrate 100, the orthographic projection of the support portion 310 is located inside the orthographic projection of the crown portion 320, that is, the isolation structure 300 generally has a shape that is wider at the top and narrower at the bottom. As a result, some layers in the light-emitting unit 200 (for example, the light-emitting functional layer described below) are separated at the edge of the isolation structure 300 during deposition, reducing the risk of crosstalk between adjacent light-emitting units.

[0083] The isolation structure 300 is limited to a design that is wider at the top and narrower at the bottom, and the first sealing layer 410 forms a space 401 on one side of the isolation structure 300. Furthermore, as shown in Figure 3, depending on parameters such as the thickness of the first sealing layer 410, the portion of the first sealing layer 410 that covers the crown portion 320 and the portion that covers the light-emitting unit 200 can be closed off (position of the contact surface 402, note that the contact surface 402 is not a separation interface), thereby making the space 401 a closed space 401. In this way, in the process of manufacturing different types of light-emitting units 200, harmful materials such as corrosive liquid or etching gas do not flow into the closed space 401, thus avoiding etching and damage to the sealing unit 411. Note that the contact surface 402 is a virtual interface that only indicates the closed position.

[0084] Furthermore, the first sealing layer 410 is not limited to forming a closed space as shown in Figure 3, but may also be formed as an open space as shown in Figure 6, and may be specifically selected according to the needs of the actual process, which will not be explained here.

[0085] In at least one embodiment of the present disclosure, as shown in Figure 6, the light-emitting unit 200 includes a first electrode 210, a light-emitting functional layer 220, and a second electrode 230 sequentially laminated on a substrate 100, with the light-emitting functional layer 220 and the second electrode 230 of each light-emitting unit 200 located within corresponding isolation openings 301. During the manufacturing process of the light-emitting functional layer 220, the isolation structure 300 (including a crown portion 320) restricts the diffusion range of the deposited material such that the orthographic projection of the edge of the crown portion 320 on the substrate 100 lies within the orthographic projection of the light-emitting functional layer 220 and the second electrode 230. Specifically, refer to the relevant descriptions in the embodiments of the manufacturing method of the display panel below, which are omitted here.

[0086] For example, the light-emitting functional layer may further include a light-emitting layer 222 and a second functional layer 223, and the first functional layer 221, light-emitting layer 222, and second functional layer 223 are sequentially stacked on the first electrode 210. The first functional layer 221 may include a hole injection layer, a hole transport layer, an electron blocking layer, etc. The second functional layer 223 may include an electron injection layer, an electron transport layer, a hole blocking layer, etc. Since carriers (holes, electrons) mainly cause crosstalk between adjacent light-emitting units 200 via the first functional layer 221, the installation of the isolation structure 300 requires electrically isolating the first functional layer 221 of each light-emitting unit 200 from each other.

[0087] For example, in at least one embodiment of the present disclosure, the first electrode may be configured as an anode and the second electrode may be configured as a cathode.

[0088] Because the isolation structure 300 has a shape that is wider at the top and narrower at the bottom, the first functional layer 221 is separated at the edge of the crown portion 320 during deposition, that is, the first functional layer 221 does not cause crosstalk between adjacent light-emitting units 200 due to being connected to the conductive portion (e.g., the support portion 310) of the isolation structure 300.

[0089] In the embodiments of this disclosure, the isolation structure is used to provide conductivity to the second electrode. To avoid the isolation structure being connected to the first electrode, the dimensions of the first electrode may be reduced to separate it from the isolation structure, or an insulating layer may be installed between the first electrode and the isolation structure.

[0090] Furthermore, after manufacturing one batch of light-emitting units 200 and the sealing units 411 on top of them, when manufacturing the next batch of light-emitting units 200, layers for forming the light-emitting functional layer 220 and the second electrode 230 are deposited to cover the surface (including the sides) of the sealing unit 411, and these layers constitute a protective layer. The second electrode 230 needs to have a thin thickness in order to achieve both conductivity and light transmittance. In this case, if the flatness of the side surface of the sealing unit 411 is poor, it becomes difficult for the layer for forming the second electrode 230 to have good continuity on that side surface, resulting in low film deposition quality. Consequently, in the process of manufacturing the next batch of sealing units 411, the protective layer has difficulty protecting the sealing units 411 manufactured in the previous batch, and there is a risk of sealing defects in the display panel.

[0091] For example, in at least one embodiment of the present disclosure, as shown in Figure 6, the display panel may further include a pixel definition layer 330 located between the substrate 100 and the isolation structure 300, the pixel definition layer 330 defining a plurality of pixel apertures 302, each corresponding to an isolation aperture 301, the orthographic projection of the pixel apertures 302 on the substrate 100 being located within the orthographic projection of the corresponding isolation apertures 301, and the light-emitting functional layer 220 and the second electrode 230 filling the pixel apertures 302 and extending to the surface of the pixel definition layer 330 facing away from the substrate 100. In each isolation aperture 301, the orthographic projection of the pixel aperture 302 on the substrate 100 overlaps with the light-emitting region of the light-emitting unit 200, i.e., the pixel definition layer 330 defines the light-emitting region of the light-emitting unit 200.

[0092] In at least one embodiment of this disclosure, the pixel definition layer 330 may be an inorganic layer. Because inorganic layers have high density and strong resistivity, the design thickness of the display panel can be reduced. In addition, a pixel definition layer 330 with a small thickness contributes to the continuity of the second electrode 230.

[0093] In the embodiments of this disclosure, the flatness of the side surface of the pixel aperture 302 defined by the pixel definition layer 330 also affects the continuity of the second electrode 230; therefore, the pixel definition layer 330 may be designed with reference to the first sealing layer described in the above embodiments.

[0094] In some embodiments of this disclosure, the density of the pixel definition layer 330 gradually decreases from the side of the pixel definition layer 330 facing the substrate 100 toward the side away from the substrate 100. This improves the flatness of the side surface of the pixel aperture 302 and ensures the continuity of the second electrode 230 on that side surface.

[0095] The method for controlling the density distribution during the manufacturing process of the pixel definition layer 330 can be found in the related explanation of the manufacturing method of the first sealing layer in the above-described embodiment, and will not be explained here.

[0096] In the embodiments of this disclosure, the pixel definition layer can exhibit a lower refractive index when the density is high, and conversely, the pixel definition layer can exhibit a higher refractive index when the density is low. That is, the refractive index of the pixel definition layer gradually decreases from the side of the pixel definition layer facing the substrate to the side away from the substrate.

[0097] In some other embodiments of this disclosure, the pixel definition layer 330 includes at least two sub-definition layers stacked on top of each other, wherein the refractive index of the sub-definition layers increases as the distance to the substrate 100 decreases. In this case, the density of the sub-definition layers increases as the distance to the substrate 100 decreases. In this way, by controlling the refractive index of the different sub-definition layers, the density of the different sub-definition layers can be adjusted, improving the flatness of the side surface of the pixel aperture and ensuring the continuity of the second electrode on that side surface.

[0098] In at least one embodiment of this disclosure, the side surface of the pixel definition layer 330 is a smooth surface. For example, the side surface of the pixel definition layer 330 is planar, and the surface on which the side surface of the pixel definition layer 330 is located intersects with and is not perpendicular to the surface on which the substrate 100 is located. This arrangement makes it easier to ensure the continuity of the second electrode 230 on the side surface of the pixel definition layer 330.

[0099] In at least one embodiment of the present disclosure, as shown in Figure 7, the isolation structure 300 may further include an auxiliary support portion 340, the auxiliary support portion 340 located on the side of the support portion 310 that is backward from the crown portion 320, and in the base 100, the orthographic projection of the auxiliary support portion 340 is located inside the orthographic projection of the crown portion 320, and in the base 100, the orthographic projection of the support portion 310 is located inside the orthographic projection of the auxiliary support portion 340.

[0100] For example, the auxiliary support portion 340 is a conductive structure, and the portion of the auxiliary support portion 340's surface facing away from the base 100 that is not covered by the support portion 310 can come into contact with the second electrode 230, and the deposition thickness of the second electrode 230 on the surface of the auxiliary support portion 340 is greater than that of the sidewall of the support portion 310. In this way, the auxiliary support portion 340 and the second electrode 230 have a larger contact area and bonding strength, reducing the impedance between the second electrode 230 and the isolation structure 300.

[0101] For example, the crown portion 320, the support portion 310, and the auxiliary support portion 340 may be manufactured in the order of titanium, aluminum, and molybdenum, and the corrosion resistance of titanium, molybdenum, and aluminum will decrease sequentially, thereby forming the isolated structure 300 as shown in Figure 7.

[0102] For example, in some embodiments of this disclosure, the support portion 310 and the crown portion 320 may be an integrated structure, the isolation structure 300 is a conductive structure, and the second electrode 230 of the light-emitting unit 200 is electrically connected to the support portion 310. The integrated structure may be an independent layer, and there is no physical interface in the layer, and the support portion 310 and the crown portion 320 are two parts of the integrated structure. Furthermore, for example, along a direction perpendicular to the substrate 100, the cross-sectional shape of the crown portion 320 is an inverted trapezoid, with the apex of the inverted trapezoid facing the substrate 100, that is, the apex of the inverted trapezoid is located between the substrate 100 and the base of the inverted trapezoid.

[0103] For example, in some other embodiments of the present disclosure, the support portion 310 and the crown portion 320 are two independent layers, the support portion 310 is a conductive structure, and the second electrode 230 of the light-emitting unit 200 is electrically connected to the support portion. For example, along the direction perpendicular to the substrate 100, the cross-sectional shape of the support portion 310 is an isosceles trapezoid, and the crown portion is located at the top of the support portion 310. This makes it easier for the deposition material of the second electrode 230 to deposit on the side walls of the support portion 310, thereby improving the reliability of the superimposed connection between the second electrode 230 and the support portion 310.

[0104] At least one embodiment of this disclosure provides a method for manufacturing a display panel. The manufacturing method includes the steps of: preparing a substrate; forming an isolation structure and a plurality of light-emitting units on the substrate, wherein the isolation structure has a plurality of isolation openings, and the isolation openings restrict the position of the light-emitting units; and forming at least one first layer on the substrate, wherein the input power is gradually reduced during the generation of the first layer, thereby gradually reducing the density of the first layer in the direction away from the substrate. The specific structure of a display panel manufactured by this method can be found in the relevant descriptions in the above embodiments and is omitted here. The first layer may include at least one of the first sealing layer and the pixel definition layer described in the above embodiments.

[0105] For example, in a method for manufacturing a display panel according to at least one embodiment of the present disclosure, the first layer includes at least two sub-sealing layers stacked on top of each other, and the step of forming the first layer on a substrate includes adjusting the input power such that the density of the at least two sub-sealing layers gradually decreases. The specific process can be found in the relevant descriptions of the above embodiments and is omitted here.

[0106] For example, in a method for manufacturing a display panel according to at least one embodiment of the present disclosure, the first layer includes a first sealing layer, which is formed on the side of the isolation structure that is backward from the substrate and covers the isolation opening and the light-emitting unit. For example, the first sealing layer includes a plurality of sealing units, each corresponding to a light-emitting unit. For example, a sealing unit includes a first main surface facing the substrate and / or the isolation structure, a second main surface backward from the substrate and / or the isolation structure, and a side surface connecting the first and second main surfaces, the side surface of the sealing unit being a smooth surface. For example, the side surface of the sealing unit is planar, and the surface on which the side surface of the sealing unit is located intersects with and is not perpendicular to the surface on which the substrate is located. For specific details of the structure of the first sealing layer in the display panel, please refer to the relevant descriptions in the above embodiments, and the description is omitted here.

[0107] For example, in a method for manufacturing a display panel according to at least one embodiment of the present disclosure, the first layer includes a pixel definition layer, the pixel definition layer is located between the substrate and the isolation structure and has a plurality of pixel apertures formed thereon, the pixel apertures are set corresponding to the isolation apertures, and on the substrate, the orthographic projection of the pixel apertures is located inside the orthographic projection of the corresponding isolation apertures. For example, the second side surface of the pixel definition layer is a smooth surface. For example, the second side surface of the pixel definition layer is a plane, and the surface on which the second side surface of the pixel definition layer is located intersects with and is not perpendicular to the surface on which the substrate is located. For specific details of the structure of the pixel definition layer in the display panel, please refer to the relevant descriptions in the above embodiments, and the description will be omitted here.

[0108] In the embodiments of this disclosure, if the light-emitting units 200 are divided into multiple types that emit light rays of different colors, the light-emitting units 200 that emit different light rays are manufactured independently, but the layers in each light-emitting unit 200 (for example, vapor-deposited layers such as the light-emitting functional layer) are vapor-deposited over the entire surface of the display panel during vapor deposition. For example, the light-emitting units 200 are classified into light-emitting units that emit red light (R), green light (G), and blue light (B), respectively, and in the manufacturing process, the light-emitting units R, G, and B are manufactured sequentially. When manufacturing the light-emitting unit R, the light-emitting unit R is formed in each of the isolation openings 301, a first sealing layer 410 is manufactured on the display panel to cover the light-emitting unit G, and then the first sealing layer 410 and the second electrode and light-emitting functional layer of the light-emitting unit R in some of the isolation openings 301 (used to form the light-emitting units G and B in the final product) are removed to obtain a sealing unit 411. In this process, the first sealing layer 410 is used to protect the light-emitting unit R in the other isolation opening 301. Based on this method, the light-emitting units G and B are manufactured sequentially, and finally the first sealing layer 410 as shown in Figure 8 is formed. In other words, the first sealing layer 410 for the entire display panel is manufactured in multiple processes.

[0109] In the embodiments of this disclosure, there are no restrictions on the manufacturing order of the three types of light-emitting units R, G, and B. For example, the order can be designed according to the needs of the actual process, or the manufacturing process may be carried out based on the order of light-emitting units B, G, and R.

[0110] The manufacturing process of the display panel shown in Figure 8 will be explained below with reference to Figures 8(A) to (D), and the principle by which the isolation structure can increase the pixel array density (PPI) will be intuitively demonstrated.

[0111] As shown in Figure 8(A), a substrate 100 is prepared, first electrodes 210 are formed in an array on the substrate 100, an insulating material layer (for example, an inorganic material layer) is deposited on the substrate 100 on which the first electrodes 210 are formed, a support portion 310 and a crown portion 320 are formed on the display panel, and the insulating material layer is patterned to form a pixel definition layer 330 (which has a grid-like planar shape). The pixel definition layer 330 covers the gaps between adjacent first electrodes 210, and in this way, the planar shape of the pixel definition layer 330 becomes a grid.

[0112] In the embodiments of this disclosure, the patterning process may be a photolithography patterning process, which may include, for example, applying a photoresist to a structural layer to be patterned, exposing the photoresist with a mask plate, developing the exposed photoresist to obtain a photoresist pattern, etching the structural layer with the photoresist pattern (wet etching or dry etching), and then selectively removing the photoresist pattern. If the material of the structural layer (for example, the photoresist pattern 500 below) contains a photoresist, the desired pattern can be formed by directly exposing the structural layer through a mask plate.

[0113] As shown in Figure 8(B), a light-emitting functional layer 220 and a second electrode 230 are deposited on the substrate 100 to form light-emitting units 200 within all isolation openings 301 of the isolation structure 300. Since no mask plate is used for deposition in this process, the deposited material is also deposited on the crown portion 320. Subsequently, a first sealing layer 410a is deposited to cover the light-emitting units 200. For example, the light-emitting layer in the deposited light-emitting functional layer 220 can emit red light, meaning that at this stage, light-emitting units 200 that emit red light are also formed within all isolation openings 301 of the isolation structure 300.

[0114] As shown in Figure 8(C), a photoresist is formed (for example, by coating) on ​​the substrate 100 on which the first sealing layer 410a is formed, and then patterned to form a photoresist pattern 500. The photoresist pattern 500 covers only a portion of the isolation opening 301 of the isolation structure 300.

[0115] As shown in Figure 8(D), the surface of the display panel is etched using the photoresist pattern 500 as a mask to remove the first sealing layer 410a, the second electrode 230, and the light-emitting functional layer 220 that are not covered by the photoresist pattern 500. Here, the remaining portion of the first sealing layer 410a forms the sealing unit 411 shown in Figure 8, and then the remaining photoresist pattern 500 is removed.

[0116] In this process, when removing the remaining photoresist pattern 500, an etching solution (or etching gas) is used, and these etching solutions enter the space in the side wall of the support portion 310 and destroy the first sealing layer 410.

[0117] By repeating the steps shown in Figures 8(A) to 8(D) above, a light-emitting unit 200 that emits green light and a light-emitting section 200 that emits blue light are formed in the other isolation openings 301, respectively, to form a display panel as shown in Figure 8.

[0118] As shown in Figure 9, when a light-emitting functional layer (for example, the first functional layer within it) is deposited, if the deposition source P moves to face the isolation structure 300 directly, the boundary of the deposition angle corresponds to lines L1 and L2 on the display panel. In this case, the area in front of lines L1 and L2 is not deposited, while the area of ​​lines L1 and L2 that is away from the isolation structure 300 is deposited regardless of the position of the deposition source P. In other words, starting from the area of ​​line L1 or line L2, the closer to the isolation structure 300, the smaller the thickness of the light-emitting functional layer becomes.

[0119] In at least one embodiment of this disclosure, as shown in Figure 10, the first sealing layer 410 forms a space on one side of the isolation structure 300. Furthermore, the first sealing layer 410 is closed (in contact) between the portion covering the crown portion 320 and the portion covering the light-emitting unit 200, so that the space becomes a closed space. In this way, during the process of manufacturing different types of light-emitting units, harmful materials such as corrosive liquids or etching gases do not flow into the closed space.

[0120] In at least one embodiment of the present disclosure, as shown in Figure 10, the display panel further includes a first sealing layer 410, a second sealing layer 420 and a third sealing layer 430 covering an isolation structure and a light-transmitting shielding layer, the second sealing layer 420 being located between the first sealing layer 410 and the third sealing layer 430. The first sealing layer 410, the second sealing layer 420 and the third sealing layer 430 constitute a sealing layer 400.

[0121] In at least one embodiment of the present disclosure, as shown in Figure 10, the first sealing layer 410 and the third sealing layer 430 are inorganic layers, and the second sealing layer 420 is an organic layer. Furthermore, for example, the second sealing layer 420 is a planarization layer. The inorganic layers are dense and can block water and oxygen, and the second sealing layer 420 is an organic layer with a large thickness to planarize the surface of the display panel.

[0122] In at least one embodiment of the present disclosure, as shown in Figure 10, the substrate 100 includes a base and a drive circuit layer located on the base, the drive circuit layer including a plurality of pixel drive circuits located in a display area, and the display function layer located on the drive circuit layer. For example, the pixel drive circuit may include a plurality of transistor TFTs, capacitors, etc., and can be formed in multiple forms such as 2T1C (i.e., two transistors (TFTs) and one capacitor (C)), 3T1C, or 7T1C. The pixel drive circuit is connected to the light-emitting unit 200 to control the on / off state and light-emitting brightness of the light-emitting unit 200.

[0123] At least one embodiment of the present disclosure provides a display panel comprising a substrate, an isolation structure located on the substrate, a first sealing layer, and a plurality of light-emitting units. The isolation structure has a plurality of isolation openings defining each of the light-emitting units, and the first sealing layer covers the isolation openings and the light-emitting units and includes a plurality of sealing units corresponding to each of the light-emitting units, each sealing unit including a first main surface facing the substrate and / or the isolation structure, a second main surface facing away from the substrate and / or the isolation structure, and a side surface connecting the first main surface and the second main surface, the side surface of the sealing unit being a smooth surface. By making the side surface of the sealing unit a smooth surface in this way, the first sealing layer can be more effectively protected during the manufacturing process of the display panel. The structure of the display panel in this embodiment and further design of the display panel can be found in the relevant descriptions in the above embodiments and are omitted here.

[0124] At least one embodiment of the present disclosure provides a display device, which may include the display panel of the above embodiment. For example, the display device may include structures such as a touch structure installed on the light-emitting side of the display panel, an optical film sheet (e.g., a microlens, a polarizing sheet), and a cover plate.

[0125] For example, the display device may be any product or component with a display function, such as a television, digital camera, mobile phone, wristwatch, tablet PC, laptop computer, or navigator.

[0126] The above description is merely a preferred embodiment of this specification and does not limit it. Any modifications, equivalent substitutions, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. It is a display panel, circuit board and A plurality of light-emitting units located on the substrate, An isolation structure located on the substrate and having a plurality of isolation openings that define each of the light-emitting units, The isolation opening and the first sealing layer covering the light-emitting unit are included, The density of the first sealing layer gradually decreases from the side of the first sealing layer facing the substrate toward the side away from the substrate. Display panel.

2. The first sealing layer includes a plurality of sealing units, each corresponding to one of the light-emitting units. The preceding first sealing layer is an inorganic layer. The display panel according to claim 1.

3. The sealing unit includes a first main surface facing the substrate and / or the isolation structure, a second main surface facing away from the substrate and / or the isolation structure, and a side surface connecting the first main surface and the second main surface, wherein the first side surface of the sealing unit is a smooth surface. The display panel according to claim 2.

4. The first side surface of the sealing unit is flat, and the surface on which the first side surface of the sealing unit is located intersects with and is not perpendicular to the surface on which the substrate is located. The display panel according to claim 3.

5. The display panel further includes a pixel definition layer located between the substrate and the isolation structure, the pixel definition layer defines a plurality of pixel apertures, the pixel apertures are provided corresponding to the isolation apertures, the orthographic projection of the pixel apertures on the substrate lies inside the orthographic projection of the corresponding isolation apertures, and the pixel definition layer is an inorganic layer. The display panel according to any one of claims 1 to 4.

6. The density of the pixel definition layer gradually decreases from the side of the pixel definition layer facing the substrate toward the side away from the substrate, the second side surface of the pixel definition layer is planar, and the surface on which the second side surface of the pixel definition layer is located intersects with and is not perpendicular to the surface on which the substrate is located. The display panel according to claim 5.

7. The isolation structure includes a support portion and a crown portion located on the side of the support portion that is facing away from the substrate, wherein the orthographic projection of the support portion on the substrate is located inside the orthographic projection of the crown portion. In the substrate, the orthographic edge of the crown portion is the orthographic edge of the isolation structure. The display panel according to any one of claims 1 to 4.

8. The light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode sequentially stacked on the substrate. The light-emitting functional layer and the second electrode of each of the light-emitting units are located within the corresponding isolation openings, the support is a conductive structure, and the second electrode of the light-emitting unit is electrically connected to the support. The display panel according to claim 7.

9. The display panel further includes a pixel definition layer located between the substrate and the isolation structure, the pixel definition layer defines a plurality of pixel apertures, and the pixel apertures are installed corresponding to the isolation apertures. The isolation structure further includes an auxiliary support portion located between the support portion and the pixel definition layer, In the substrate, the orthographic projection of the auxiliary support portion is located inside the orthographic projection of the crown portion, the orthographic projection of the support portion is located inside the orthographic projection of the auxiliary support portion, the auxiliary support portion is a conductive structure, and the second electrode of the light-emitting unit is electrically connected to the auxiliary support portion. The display panel according to claim 7.

10. The density of the pixel definition layer gradually decreases from the side of the pixel definition layer facing the substrate toward the side away from the substrate. The display panel according to claim 9.

11. The sealing unit includes a first main surface facing the substrate and / or the isolation structure, a second main surface facing away from the substrate and / or the isolation structure, and a side surface connecting the first main surface and the second main surface. The side surface includes a plurality of sub-side surfaces that are sequentially connected along the direction from the first main surface to the second main surface, and the plane determined by the boundary between the side surface and the first main surface and the boundary between the side surface and the second main surface has an angle of 45 degrees or less with respect to each of the sub-side surfaces, and in the substrate, the orthographic projection of the second main surface is located inside the orthographic projection of the first main surface. The display panel according to claim 2.

12. The refractive index of the first sealing layer gradually decreases from the side of the first sealing layer facing the substrate toward the side away from the substrate. The display panel according to any one of claims 1 to 11.

13. The oxygen content of the first sealing layer gradually increases from the side of the first sealing layer facing the substrate toward the side away from the substrate. The display panel according to any one of claims 1 to 11.

14. It is a display panel, circuit board and A plurality of light-emitting units located on the substrate, An isolation structure located on the substrate and having a plurality of isolation openings that define each of the light-emitting units, A first sealing layer covering the isolation opening and the light-emitting unit, and including a plurality of sealing units corresponding to each of the light-emitting units, The sealing unit includes a first main surface facing the substrate and / or the isolation structure, a second main surface facing away from the substrate and / or the isolation structure, and a side surface connecting the first main surface and the second main surface. The side surface includes a plurality of sub-side surfaces that are sequentially connected along the direction from the first main surface to the second main surface, and the plane determined by the boundary between the side surface and the first main surface and the boundary between the side surface and the second main surface has an angle of 45 degrees or less with respect to each of the sub-side surfaces, and in the substrate, the orthographic projection of the second main surface is located inside the orthographic projection of the first main surface. Display panel.

15. The sealing unit includes a first main surface facing the substrate and / or the isolation structure, a second main surface facing away from the substrate and / or the isolation structure, and a side surface connecting the first main surface and the second main surface, wherein the first side surface of the sealing unit is planar, and the surface on which the first side surface of the sealing unit is located intersects with and is not perpendicular to the surface on which the substrate is located. The display panel according to claim 14.

16. The density of the first sealing layer gradually decreases from the side of the first sealing layer facing the substrate toward the side away from the substrate, or The first sealing layer includes at least two sub-sealing layers stacked on top of each other, wherein the sub-sealing layer has a larger refractive index the closer it is to the substrate. The display panel according to claim 14 or 15.

17. The sealing unit includes a first sub-sealing layer, a second sub-sealing layer, and a third sub-sealing layer stacked on top of each other, wherein the first sub-sealing layer, the second sub-sealing layer, and the third sub-sealing layer are sequentially installed along a direction away from the substrate. The first sub-sealing layer, the second sub-sealing layer, and the third sub-sealing layer gradually decrease in density or gradually decrease in refractive index. The display panel according to claim 16.

18. It is a display panel, circuit board and The substrate has a plurality of light-emitting units positioned on it, An isolation structure located on the substrate and having a plurality of isolation openings that define each of the light-emitting units, A first sealing layer comprising at least two sub-sealing layers stacked on top of each other, covering the isolation opening and the light-emitting unit, The smaller the distance to the substrate, the greater the refractive index of the sub-sealing layer. Display panel.

19. The smaller the distance to the substrate, the higher the density of the sub-sealing layer, and / or The smaller the distance to the substrate, the lower the oxygen content of the sub-sealing layer. The display panel according to claim 18.

20. The light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode sequentially stacked on the substrate, and the light-emitting functional layer and the second electrode of each of the light-emitting units are located within the corresponding isolation apertures. The display panel further includes a pixel definition layer located between the substrate and the isolation structure, the pixel definition layer defines a plurality of pixel apertures corresponding to each of the isolation apertures, the orthographic projection of the pixel apertures on the substrate lies within the orthographic projection of the corresponding isolation apertures, the light-emitting functional layer and the second electrode fill the pixel apertures and extend to the surface of the pixel definition layer facing away from the substrate, and the pixel definition layer is an inorganic layer. The pixel definition layer includes at least two sub-definition layers stacked on top of each other, and the smaller the distance from the substrate, the greater the refractive index of the sub-definition layer. The display panel according to claim 18 or 19.

Images