Display panel, preparation method of display panel and display device

Abstract

The embodiment of the invention provides a display panel, a preparation method of the display panel and a display device, relates to the technical field of display, and can inhibit the reflection effect of a photosensitive hole on external light and improve the photosensitive performance of the display panel. The display panel comprises a first area and a second area. The display panel comprises a substrate; the planarization layer is located on one side of the substrate; the pixel defining layer is located on the side, away from the substrate, of the planarization layer and provided with a plurality of first openings and at least one second opening, the first openings are located in the first area, the second openings are located in the second area, the second openings penetrate through the pixel defining layer, or the second openings penetrate through at least part of the planarization layer; the light-emitting layer comprises a plurality of light-emitting units correspondingly located in the first openings; the cathode layer is located on the side, away from the substrate, of the light-emitting layer and located in the second opening; at least one of the thickness of the cathode layer at the bottom of the second opening and the thickness of the cathode layer on the side wall of the second opening is smaller than the thickness of the cathode layer on the surface of the pixel defining layer.

Description

Technical Field

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

[0002] With the advancement and development of display technology, the functions of display devices are constantly enriched. In some display devices, photosensitive holes are usually opened in the pixel definition layer of the display panel, and photosensitive devices are arranged at corresponding positions in the display device to enable external light to enter the photosensitive devices through the photosensitive holes, thereby realizing photosensitive functions such as front camera and infrared sensing through the photosensitive devices.

[0003] However, in traditional display devices, the cathode layer usually covers the bottom and side walls of the photosensitive opening of the pixel defining layer, causing external light to be reflected on the surface of the cathode layer, resulting in a decrease in the light transmittance of the photosensitive hole, affecting the photosensitivity of the photosensitive device and improving the photosensitivity performance of the display panel. Summary of the invention

[0004] Based on this, the embodiments of the present application provide a display panel, a method for preparing a display panel, and a display device, which can suppress the reflection effect of the photosensitive holes on external light, further improve the photosensitivity of the photosensitive device, and enhance the photosensitivity performance of the display panel.

[0005] A first aspect of an embodiment of the present application provides a display panel, the display panel comprising a first area and a second area, the display panel comprising:

[0006] substrate;

[0007] A planarization layer, located on one side of the substrate;

[0008] a pixel defining layer, located on a side of the planarization layer away from the substrate, the pixel defining layer being provided with a plurality of first openings and at least one second opening, the first openings being located in the first region, the second openings being located in the second region, the second openings penetrating the pixel defining layer, or the second openings penetrating at least a portion of the planarization layer;

[0009] A light-emitting layer, comprising a plurality of light-emitting units, wherein the light-emitting units are correspondingly located in the first openings;

[0010] a cathode layer, located on a side of the light-emitting layer away from the substrate, and the cathode layer is located in the second opening;

[0011] At least one of the thickness of the cathode layer at the bottom of the second opening and the thickness of the cathode layer at the sidewall of the second opening is smaller than the thickness of the cathode layer at the surface of the pixel defining layer.

[0012] In some embodiments, a thickness of the cathode layer at the bottom of the second opening is smaller than a thickness of the cathode layer at the surface of the pixel defining layer.

[0013] In some embodiments, when the second opening passes through the pixel defining layer, a width dimension of the second opening close to the substrate is greater than a width dimension of the second opening away from the substrate.

[0014] In some embodiments, the pixel defining layer includes a first sub-pixel defining layer and a second sub-pixel defining layer, and the first sub-pixel defining layer is located between the substrate and the second sub-pixel defining layer;

[0015] The second opening includes a first sub-opening and a second sub-opening, the first sub-opening is located in the first sub-pixel defining layer, the second sub-opening is located in the second sub-pixel defining layer, and an orthographic projection of the first sub-opening toward the substrate at least partially overlaps with an orthographic projection of the second sub-opening toward the substrate;

[0016] The width of the first sub-opening close to the substrate is greater than the width of the second sub-opening away from the substrate.

[0017] In some embodiments, in a direction from the substrate to the pixel defining layer, the width of the second sub-opening gradually decreases, and the width of the first sub-opening gradually decreases; or,

[0018] In a direction from the substrate to the pixel defining layer, the width of the second sub-opening gradually decreases, and the width of the first sub-opening gradually increases.

[0019] In some embodiments, the first sub-pixel defining layer and the second sub-pixel defining layer are made of different materials;

[0020] Wherein, the first sub-pixel defining layer includes a black material.

[0021] In some embodiments, when the second opening penetrates at least a portion of the planarization layer, a thickness dimension of the cathode layer on a sidewall of the second opening is smaller than a thickness dimension of the cathode layer on a surface of the pixel defining layer.

[0022] In some embodiments, a width dimension of a side of the second opening close to the substrate is smaller than a width dimension of a side of the second opening far from the substrate.

[0023] In some embodiments, in a direction from the substrate to the pixel defining layer, a width dimension of the second opening gradually increases.

[0024] In some embodiments, the planarization layer includes two to three sub-planarization layers;

[0025] The second opening penetrates at least one of the sub-planarization layers; or,

[0026] The second opening includes a groove, and the groove is located in one of the sub-planarization layers that is at the largest distance from the substrate.

[0027] In some embodiments, the display panel further includes:

[0028] a light shielding layer, located on a side of the cathode layer away from the substrate, the light shielding layer being provided with a plurality of third openings and at least one fourth opening, the third opening being located in the first region, the fourth opening being located in the second region, the orthographic projection of the third opening toward the substrate overlapping with the orthographic projection of the first opening toward the substrate, and the orthographic projection of the fourth opening toward the substrate overlapping with the orthographic projection of the second opening toward the substrate;

[0029] a color filter layer, located in the third opening, and located on a side of the light shielding layer away from the substrate, the color filter layer is provided with at least one fifth opening, the fifth opening is located in the second region, and an orthographic projection of the fifth opening toward the substrate overlaps with an orthographic projection of the fourth opening toward the substrate;

[0030] A conductive layer is located between the light-shielding layer and the pixel defining layer, and the conductive layer is located between the pixel defining layer and the substrate, the orthographic projection of the conductive layer toward the substrate falls within the edge of the orthographic projection of the light-shielding layer toward the substrate, and the orthographic projection of the conductive layer toward the substrate falls within the edge of the orthographic projection of the pixel defining layer toward the substrate.

[0031] In some embodiments, a width dimension of the fourth opening is greater than or equal to a width dimension of the second opening.

[0032] In some embodiments, the pixel defining layer includes a first sub-pixel defining layer and a second sub-pixel defining layer, and the first sub-pixel defining layer is located between the substrate and the second sub-pixel defining layer;

[0033] The second opening includes a first sub-opening and a second sub-opening, the first sub-opening is located in the first sub-pixel defining layer, the second sub-opening is located in the second sub-pixel defining layer, and an orthographic projection of the first sub-opening toward the substrate at least partially overlaps with an orthographic projection of the second sub-opening toward the substrate;

[0034] A width of the fourth opening is greater than or equal to a width of the first sub-opening.

[0035] In some embodiments, the display panel further includes:

[0036] A photosensitive device is located on a side of the substrate away from the light-emitting layer, and an orthographic projection of the photosensitive device toward the substrate overlaps with an orthographic projection of the second opening toward the substrate.

[0037] In some embodiments, the difference in size between at least one of the thickness of the cathode layer at the bottom of the second opening and the thickness of the cathode layer at the sidewall of the second opening and the thickness of the cathode layer on the surface of the pixel defining layer is in the range of 1 nm to 5 nm.

[0038] According to a second aspect of an embodiment of the present application, a method for manufacturing a display panel is provided, comprising:

[0039] providing a substrate comprising a first region and a second region;

[0040] forming a planarization layer on one side of the substrate;

[0041] forming a pixel definition layer on a side of the planarization layer away from the substrate, wherein the pixel definition layer is provided with a plurality of first openings and at least one second opening, wherein the first openings are located in the first region, the second openings are located in the second region, and the second openings penetrate the pixel definition layer, or penetrate at least a portion of the planarization layer;

[0042] forming a light-emitting layer on a side of the planarization layer away from the substrate, wherein the light-emitting layer comprises a plurality of light-emitting units, and each of the light-emitting units is correspondingly located in the first opening;

[0043] forming a cathode layer on a side of the light-emitting layer away from the substrate and in the second opening;

[0044] At least one of the thickness of the cathode layer at the bottom of the second opening and the thickness of the cathode layer at the sidewall of the second opening is smaller than the thickness of the cathode layer at the surface of the pixel defining layer.

[0045] In some embodiments, forming a cathode layer on a side of the light-emitting layer away from the substrate and in the second opening includes:

[0046] The cathode layer is formed on a side of the light emitting layer away from the substrate and in the second opening by an evaporation process, wherein the evaporation concentration in the second opening is lower than the evaporation concentration on the surface of the pixel defining layer.

[0047] According to a third aspect of the embodiments of the present application, a display device is provided, including:

[0048] A display panel as described in any one of the first aspects above.

[0049] The embodiment of the present application provides a display panel, a method for preparing a display panel, and a display device, wherein the display panel is divided into a first area and a second area, and a first opening is provided in a pixel definition layer in the first area, so that the first opening can be used to accommodate a light-emitting unit to realize display of the display panel. At the same time, by providing a second opening in the pixel definition layer in the second area, the second opening can be used as a photosensitive hole, so that external light can be incident on the inside of the display panel through the second opening. By making the second opening penetrate the pixel definition layer, it is possible to avoid the pixel definition layer absorbing the incident light, and the light transmittance of the second opening can be improved. At the same time, by making the second opening penetrate at least part of the planarization layer, the evaporation thickness of the cathode layer at the bottom and side wall of the second opening can be reduced during the evaporation process of the cathode layer. Further, by setting at least one of the thickness dimension of the cathode layer at the bottom of the second opening and the thickness dimension of the cathode layer at the side wall of the second opening to be smaller than the thickness dimension of the cathode layer on the surface of the pixel definition layer, the reflective capacity of the cathode layer at the bottom and side wall of the second opening can be reduced, so that at least part of the external light can be incident on the planarization layer and the substrate through the cathode layer at the bottom and side wall of the second opening. At the same time, the cathode layer on the side wall of the second opening can also reflect the incident external light to increase the amount of light incident on the cathode layer at the bottom of the second opening, and further increase the light transmittance of the cathode layer at the bottom of the second opening. Thus, the reflection effect of the cathode layer in the second opening on the external light can be suppressed, the light transmittance of the second opening can be increased, and the photosensitivity of the display panel can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions 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 related drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A schematic structural diagram of a display panel provided in an embodiment of the present application;

[0052] Figure 2 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0053] Figure 3 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0054] Figure 4A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0055] Figure 5 A schematic structural diagram of a display panel provided in an embodiment of the present application;

[0056] Figure 6 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0057] Figure 7 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0058] Figure 8 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0059] Fig. 9 A schematic structural diagram of a display panel provided in an embodiment of the present application;

[0060] Fig.10 A schematic flow chart of a method for preparing a display panel provided in an embodiment of the present application;

[0061] Fig.11 A schematic structural diagram of a display device provided in an embodiment of the present application.

[0062] Description of reference numerals:

[0063] 100, substrate; 200, planarization layer; 201, sub-planarization layer; 300, pixel definition layer; 310, first sub-pixel definition layer; 320, second sub-pixel definition layer; 400, light-emitting layer; 500, cathode layer; 510, cathode layer on the surface of the pixel definition layer; 520, cathode layer on the side wall of the second opening; 530, cathode layer at the bottom of the second opening; 600, light-shielding layer; 700, color filter layer; 800, conductive layer; 801, first conductive layer; 802, second conductive layer; 900, photosensitive device; 1000, display panel; A1, first area; A2, second area; H1, first opening; H2, second opening; H21, first sub-opening; H22, second sub-opening; H3, third opening; H4, fourth opening; H5, fifth opening. DETAILED DESCRIPTION

[0064] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0066] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers, doping types and / or parts, these elements, components, regions, layers, doping types and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, doping type or part from another element, component, region, layer, doping type or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer, doping type or portion discussed below may be represented as a second element, component, region, layer or portion; for example, the first doping type may be referred to as the second doping type, and similarly, the second doping type may be referred to as the first doping type; the first doping type and the second doping type are different doping types, for example, the first doping type may be P-type and the second doping type may be N-type, or the first doping type may be N-type and the second doping type may be P-type.

[0067] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0068] When used herein, the singular forms "a", "an" and " / the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, in this specification, the term "and / or" includes any and all combinations of the relevant listed items.

[0069] With the advancement and development of display technology, the functions of display devices are constantly enriched. In some display devices, photosensitive holes are usually opened in the pixel definition layer of the display panel, and photosensitive devices are arranged at corresponding positions in the display device to enable external light to enter the photosensitive devices through the photosensitive holes, thereby realizing photosensitive functions such as front camera and infrared sensing through the photosensitive devices.

[0070] It should be noted that in traditional display devices, the cathode layer usually covers the bottom and side walls of the photosensitive opening of the pixel defining layer, so that the external light is reflected on the surface of the cathode layer, resulting in a decrease in the light transmittance of the photosensitive hole, affecting the photosensitivity of the photosensitive device and improving the photosensitivity of the display panel. Existing display devices usually increase the light transmittance of the photosensitive hole by increasing the opening size of the photosensitive hole and increasing the amount of incident external light. However, the increase in the size of the photosensitive hole will cause the photosensitive hole to occupy too much space on the display panel, further resulting in an increase in the amount of light reflected by the cathode layer in the hole, making the photosensitive hole easy to be observed by the user, affecting the user's experience.

[0071] like Figure 1As shown, a first aspect of an embodiment of the present application provides a display panel, the display panel includes a first area A1 and a second area A2, and the display panel includes: a substrate 100, a planarization layer 200, a pixel defining layer 300, a light emitting layer 400 and a cathode layer 500. Among them, the planarization layer 200 is located on one side of the substrate 100; the pixel definition layer 300 is located on the side of the planarization layer 200 away from the substrate 100, and the pixel definition layer 300 is provided with a plurality of first openings H1 and at least one second opening H2, the first opening H1 is located in the first area A1, the second opening H2 is located in the second area A2, the second opening H2 passes through the pixel definition layer 300, or the second opening H2 passes through at least a portion of the planarization layer 200; the light-emitting layer 400 includes a plurality of light-emitting units, and the light-emitting units are correspondingly located in the first opening H1; the cathode layer 500 is located on the side of the light-emitting layer 400 away from the substrate 100, and the cathode layer 500 is located in the second opening H2; at least one of the thickness dimension of the cathode layer 530 at the bottom of the second opening H2 and the thickness dimension of the cathode layer 520 on the side wall of the second opening H2 is smaller than the thickness dimension of the cathode layer 510 on the surface of the pixel definition layer 300.

[0072] For example, the material of the planarization layer 200 may include an insulating light-transmitting material. The number of the second openings H2 may be determined according to the number of photosensitive holes and the photosensitive area required for the display panel. Figure 1 As shown, the substrate 100 may include a plurality of sub-substrates, specifically, in the direction from the substrate 100 to the planarization layer 200, the sub-substrates stacked in sequence may be a first flexible PI substrate 1stPI, a first buffer layer Buffer1, and a second flexible PI substrate 2stPI. The planarization layer 200 may include a plurality of sub-planarization layers 201, specifically, in the direction from the substrate 100 to the planarization layer 200, the sub-planarization layers 201 stacked in sequence may be a second buffer layer Buffer2, a third buffer layer Buffer3, a buffer layer Buffer, a first gate insulation layer GI1, an interlayer metal isolation layer IMD, a first interlayer insulation layer ILD1, a second gate insulation layer GI2, a third gate insulation layer GI3, a second interlayer insulation layer ILD2, a passivation layer PV, a first planarization layer PLN1, a second planarization layer PLN2, a first metal interconnection via layer VIA1, and a third planarization layer PLN3. The surface of the light-emitting layer 400 away from the substrate 100 may have multiple optical film layers. Specifically, in the direction from the substrate 100 to the planarization layer 200, the optical film layers stacked in sequence may be the first vapor deposition layer CVD1, the inkjet printing layer IJP, the second vapor deposition layer and the buffer layer CVD2+ Buffer, the second touch insulating layer TP2, and the touch optical adhesive layer TPOC. It should be noted that in an actual display panel, the above film layers may appear in any combination, and the positions of the above film layers in the thickness direction of the substrate 100 are not limited.

[0073] It should be noted that the second opening H2 completely penetrates the pixel defining layer 300. The second opening H2 may penetrate to the surface of the planarization layer 200, or the second opening H2 may penetrate part of the planarization layer 200, or the second opening H2 may completely penetrate the planarization layer 200, and the second opening H2 penetrates to the surface of the substrate 100.

[0074] The display panel provided in the embodiment of the present application is divided into a first area A1 and a second area A2, and a first opening H1 is provided in the pixel defining layer 300 in the first area A1, so that the first opening H1 can be used to accommodate the light-emitting unit to realize the display of the display panel. At the same time, by providing a second opening H2 in the pixel defining layer 300 in the second area A2, the second opening H2 can be used as a photosensitive hole, so that external light can be incident into the interior of the display panel through the second opening H2. By making the second opening H2 pass through the pixel defining layer 300, it is possible to avoid the pixel defining layer 300 absorbing the incident light, and the light transmittance of the second opening H2 can be improved. At the same time, by making the second opening H2 pass through at least a portion of the planarization layer 200, the evaporation thickness of the cathode layer 500 at the bottom and sidewalls of the second opening H2 can be reduced during the evaporation process of the cathode layer 500. Further, by setting at least one of the thickness of the cathode layer 530 at the bottom of the second opening H2 and the thickness of the cathode layer 520 at the side wall of the second opening H2 to be smaller than the thickness of the cathode layer 510 on the surface of the pixel defining layer 300, the reflective ability of the cathode layer 500 at the bottom and side wall of the second opening H2 can be reduced, so that at least part of the external light can be incident on the planarization layer 200 and the substrate 100 through the cathode layer 500 at the bottom and side wall of the second opening H2. At the same time, the cathode layer 520 at the side wall of the second opening H2 can also reflect the incident external light to increase the amount of light incident on the cathode layer 530 at the bottom of the second opening H2, and the light transmittance of the cathode layer 530 at the bottom of the second opening H2 can be further increased. In this way, the reflection effect of the cathode layer 500 in the second opening H2 on the external light can be suppressed, the light transmittance of the second opening H2 can be improved, and the photosensitivity of the display panel can be further improved.

[0075] like Figure 1 As shown, in some feasible implementations, the thickness of the cathode layer 530 at the bottom of the second opening H2 is smaller than the thickness of the cathode layer 510 on the surface of the pixel defining layer 300 .

[0076] The display panel provided in the embodiment of the present application is provided with a second opening H2 in the pixel defining layer 300 in the second area A2, so that the second opening H2 can be used as a photosensitive hole, so that external light can be incident on the inside of the display panel through the second opening H2. Further, by setting the thickness of the cathode layer 530 at the bottom of the second opening H2 to be smaller than the thickness of the cathode layer 510 on the surface of the pixel defining layer 300, the reflective ability of the cathode layer 530 at the bottom of the second opening H2 can be reduced, so that at least part of the external light can be incident on the planarization layer 200 and the substrate 100 through the cathode layer 500 at the bottom and sidewall of the second opening H2, and the light transmittance of the cathode layer 530 at the bottom of the second opening H2 can be further increased. In this way, the reflection effect of the cathode layer 500 in the second opening H2 on the external light can be suppressed, the light transmittance of the second opening H2 can be improved, and the photosensitivity of the display panel can be further improved.

[0077] like Figure 2 As shown, in some feasible implementations, when the second opening H2 penetrates the pixel defining layer 300 , the width of the second opening H2 close to the substrate 100 is greater than the width of the second opening H2 away from the substrate 100 .

[0078] For example, the sidewall of the second opening H2 may not have the cathode layer 500 .

[0079] It should be noted that if Figure 2 As shown, the orthographic projection of the surface of the pixel defining layer 300 disposed around the second opening H2 close to the substrate 100 toward the substrate falls inside the orthographic projection of the surface of the pixel defining layer 300 disposed around the second opening H2 away from the substrate 100 toward the substrate 100 .

[0080] The display panel provided in the embodiment of the present application sets the width dimension of the second opening H2 close to the substrate 100 to be larger than the width dimension of the second opening H2 away from the substrate 100, so that the cathode film can be disconnected at the side wall of the second opening H2 during the process of evaporating the cathode layer 500, thereby avoiding the formation of the cathode layer 500 on the side wall of the second opening H2, suppressing the reflective ability of the cathode layer 500 in the second opening H2, improving the light transmittance of the second opening H2, and further improving the photosensitivity of the display panel. At the same time, by forming the second opening H2 with a small top and a large bottom, when the cathode layer 530 at the bottom of the second opening H2 reflects external light, the pixel defining layer 300 on the side wall of the second opening H2 can absorb the reflected light, reduce the emission amount of the reflected light, and further reduce the risk of the user observing the second opening H2.

[0081] like Figures 3 to 6As shown, in some feasible embodiments, the pixel defining layer 300 includes a first sub-pixel defining layer 310 and a second sub-pixel defining layer 320, and the first sub-pixel defining layer 310 is located between the substrate 100 and the second sub-pixel defining layer 320; the second opening H2 includes a first sub-opening H21 and a second sub-opening H22, the first sub-opening H21 is located in the first sub-pixel defining layer 310, and the second sub-opening H22 is located in the second sub-pixel defining layer 320, and the orthographic projection of the first sub-opening H21 toward the substrate 100 at least partially overlaps with the orthographic projection of the second sub-opening H22 toward the substrate 100; the width dimension of the first sub-opening H21 close to the substrate 100 is greater than the width dimension of the second sub-opening H22 away from the substrate 100.

[0082] The display panel provided in the embodiment of the present application can make the width dimension of the second opening H2 close to the substrate 100 larger than the width dimension of the second opening H22 away from the substrate 100 by setting the width dimension of the first sub-opening H21 close to the substrate 100 larger than the width dimension of the second sub-opening H22 away from the substrate 100. In the process of forming the cathode layer 500 by evaporation, the cathode film can be disconnected at the side wall of the second opening H2, thereby avoiding the formation of the cathode layer 500 on the side wall of the second opening H2, suppressing the reflection ability of the cathode layer 500 in the second opening H2, improving the light transmittance of the second opening H2, and further improving the photosensitivity of the display panel. At the same time, by forming the second opening H2 with a small top and a large bottom, when the cathode layer 530 at the bottom of the second opening H2 reflects external light, the pixel defining layer 300 on the side wall of the second opening H2 can absorb the reflected light, reduce the emission amount of the reflected light, and further reduce the risk of the user observing the second opening H2.

[0083] like Figure 3 As shown, in some feasible implementations, in a direction from the substrate 100 to the pixel defining layer 300 , the width of the second sub-opening H22 gradually decreases, and the width of the first sub-opening H21 gradually decreases.

[0084] Exemplarily, the width of the second sub-opening H22 close to the substrate 100 may be equal to the width of the first sub-opening H21 away from the substrate 100, so that during the preparation of the pixel defining layer 300, the first sub-opening H21 and the second sub-opening H22 can be obtained by one etching.

[0085] For example, Figure 4 and Figure 5As shown, the width dimension of the second sub-opening H22 on the side close to the substrate 100 is not equal to the width dimension of the first sub-opening H21 on the side away from the substrate 100. The sidewall of the first sub-pixel defining layer 310 and the sidewall of the second sub-pixel defining layer 320 form a step, further forming a step. The width dimension of the positive projection of the cathode layer 530 at the bottom of the second opening H2 toward the substrate 100 can be made smaller than the width dimension of the first sub-opening H21 on the side close to the substrate 100, so that there is a gap between the cathode layer 530 at the bottom of the second opening H2 and the sidewall of the second opening H2, so that the cathode layer 500 cannot completely cover the bottom of the second opening H2, thereby further reducing the reflective ability of the cathode layer 530 at the bottom of the second opening H2 to external light, and increasing the incident light amount at the bottom of the second opening H2.

[0086] Exemplarily, at least one of the first sub-pixel defining layer 310 and the second sub-pixel defining layer 320 can absorb the light reflected by the cathode layer 530 at the bottom of the second opening H2 to reduce the emission amount of the reflected light, thereby reducing the visible risk of the second opening H2 and improving the display effect and display quality of the display panel. In addition, when at least one of the first sub-pixel defining layer 310 and the second sub-pixel defining layer 320 has a certain light reflection ability, the sidewalls of the first sub-pixel defining layer 310 and the second sub-pixel defining layer 320 can further reflect the light reflected by the cathode layer 530, so that the light can be re-incident to the bottom of the second opening H2 after secondary reflection, thereby improving the light transmittance of the second opening H2.

[0087] The display panel provided in the embodiment of the present application is configured such that the widths of the first sub-opening H21 and the second sub-opening H22 are gradually reduced in the direction from the substrate 100 to the pixel defining layer 300, so that at least part of the space in the second opening H2 is in a shape of being larger at the top and smaller at the bottom, so that the cathode film can be automatically disconnected at the edge of the second opening H2 by utilizing the side wall of the second sub-pixel defining layer 320 during the preparation of the cathode film, thereby avoiding the formation of the cathode film on the side wall of the second opening H2. Therefore, the reflection effect of the cathode layer 520 on the side wall of the second opening H2 on the external light can be further reduced, and at the same time, the light transmittance of the second opening H2 can be increased, thereby improving the photosensitivity of the display panel.

[0088] like Figure 6 As shown, in some feasible implementations, in a direction from the substrate 100 to the pixel defining layer 300 , the width of the second sub-opening H22 gradually decreases, and the width of the first sub-opening H21 gradually increases.

[0089] The display panel provided in the embodiment of the present application is configured such that the width of the second sub-opening H22 is gradually reduced, the width of the first sub-opening H21 is gradually increased, and the width of the second opening H2 away from the substrate 100 is smaller than the width of the second opening H2 close to the substrate 100, so that the sidewall of the second sub-pixel defining layer 320 can be used to further absorb or reflect the light reflected by the cathode layer 530 at the bottom of the second opening H2. Thus, the amount of light reflected from the second opening H2 can be reduced, and the amount of light incident on the cathode layer 530 at the bottom of the second opening H2 can be increased, thereby increasing the light transmittance of the second opening H2, reducing the visible risk of the second opening H2, and improving the photosensitivity and display effect of the display panel.

[0090] In some feasible implementations, the first sub-pixel defining layer 310 and the second sub-pixel defining layer 320 are made of different materials; wherein the first sub-pixel defining layer 310 includes a black material.

[0091] For example, the material that the second sub-pixel defining layer 320 may include may have a certain reflective effect. The color of the material included in the second sub-pixel defining layer 320 is different from the color of the material included in the first sub-pixel defining layer 310 .

[0092] The display panel provided in the embodiment of the present application can avoid color mixing of light emitted by light-emitting units with different luminous colors by setting the first sub-pixel defining layer 310 to include black material, thereby improving the accuracy of the displayed image and the display performance of the display panel.

[0093] For example, Figure 7 As shown, the second sub-pixel defining layer 320 can also be located on the side of the first sub-pixel defining layer 310 close to the second opening H2, wherein the material of the first sub-pixel defining layer 310 can include a black material, and the material of the second sub-pixel defining layer 320 can have a certain reflective effect. Thus, the light reflection ability of the side wall of the second opening H2 can be increased, and the utilization rate of the light reflected by the cathode layer 530 at the bottom of the second opening H2 can be further improved, and the probability of the reflected light being re-reflected to the bottom of the second opening H2 can be increased, thereby improving the light transmittance of the second opening H2, and further improving the photosensitivity of the display panel.

[0094] like Figure 1 As shown, in some feasible embodiments, when the second opening H2 penetrates at least a portion of the planarization layer 200 , the thickness of the cathode layer 520 on the sidewall of the second opening H2 is smaller than the thickness of the cathode layer 510 on the surface of the pixel defining layer 300 .

[0095] The display panel provided in the embodiment of the present application can reduce the reflective ability of the cathode layer 520 on the side wall of the second opening H2 by setting the thickness of the cathode layer 520 on the side wall of the second opening H2 to be smaller than the thickness of the cathode layer 510 on the surface of the pixel defining layer 300, so that part of the light can pass through the cathode layer 520 on the side wall of the second opening H2 and directly enter the display panel. At the same time, the light can be reflected by the cathode layer 520 on the side wall of the second opening H2, so that the light can be continuously reflected between the cathode layers 520 on the side wall of the second opening H2, so that the light reflected by the cathode layer 520 on the side wall of the second opening H2 can be incident on the bottom of the second opening H2, so as to increase the amount of light incident on the cathode layer 530 at the bottom of the second opening H2, and further increase the second opening H2, thereby further improving the photosensitivity of the display panel.

[0096] like Figure 1 As shown, in some feasible implementations, the width dimension of the second opening H2 close to the substrate 100 is smaller than the width dimension of the second opening H2 away from the substrate 100 .

[0097] The display panel provided in the embodiment of the present application can increase the surface area of ​​the side wall of the second opening H2 in the process of setting the cathode film by setting the width dimension of the side of the second opening H2 close to the substrate 100 smaller than the width dimension of the side of the second opening H2 away from the substrate 100, so as to reduce the thickness dimension of the cathode layer 520 on the side wall of the second opening H2. Thus, the reflective ability of the cathode layer 520 on the side wall of the second opening H2 can be reduced, so that part of the light can pass through the cathode layer 520 on the side wall of the second opening H2 and directly enter the inside of the display panel. At the same time, the light can be continuously reflected between the cathode layer 520 on the side wall of the second opening H2 to enter the bottom of the second opening H2, so as to increase the amount of light incident on the cathode layer 530 at the bottom of the second opening H2, and further increase the second opening H2, thereby further improving the photosensitivity of the display panel.

[0098] like Figure 1 As shown, in some feasible implementations, in a direction from the substrate 100 to the pixel defining layer 300 , the width of the second opening H2 gradually increases.

[0099] The display panel provided by the embodiment of the present application can prevent the cathode film from being disconnected during the process of forming the cathode film on the side wall of the second opening H2 by gradually increasing the width of the second opening H2 in the direction from the substrate 100 to the pixel defining layer 300, and can also reduce the thickness of the cathode layer 520 on the side wall of the second opening H2 as the distance between the cathode layer 500 and the bottom of the second opening H2 decreases. This makes it easier for light to directly pass through the cathode layer 520 on the side wall of the second opening H2 close to the substrate 100, and can reduce the angle between the passing light and the normal line, so that the passing light is more easily sensed by the photosensitive device, thereby improving the photosensitivity of the display panel.

[0100] like Figure 8 As shown, in some feasible implementations, the planarization layer 200 includes two to three sub-planarization layers 201 ; and the second opening H2 penetrates at least one sub-planarization layer 201 .

[0101] By way of example, the sub-planarization layer 201 may include a passivation layer and an insulating layer for setting a metal interconnection structure.

[0102] The display panel provided in the embodiment of the present application can deepen the depth of the second opening H2 by setting the second opening H2 to pass through at least one sub-planarization layer 201, thereby reducing the thickness of the film layer that the light passing through the second opening H2 needs to pass through during the photosensitivity process, thereby reducing the amount of light loss and improving the photosensitivity performance of the display panel.

[0103] like Fig. 9 As shown, in some feasible implementations, the second opening H2 includes a groove, and the groove is located in a sub-planarization layer 201 that is spaced the largest from the substrate 100 .

[0104] The display panel provided in the embodiment of the present application can reduce the difficulty of etching the second opening H2 and improve the manufacturing efficiency and manufacturing quality of the display panel by disposing the groove of the second opening H2 in a sub-planarization layer 201 which is at the largest distance from the substrate 100, without penetrating any sub-planarization layer 201.

[0105] like Figures 1 to 9As shown, in some feasible implementations, the display panel further includes: a light shielding layer 600, a color filter layer 700 and a conductive layer 800. The light shielding layer 600 is located on the side of the cathode layer 500 away from the substrate 100, and the light shielding layer 600 is provided with a plurality of third openings H3 and at least one fourth opening H4, the third opening H3 is located in the first area A1, the fourth opening H4 is located in the second area A2, the orthographic projection of the third opening H3 toward the substrate 100 overlaps with the orthographic projection of the first opening H1 toward the substrate 100, and the orthographic projection of the fourth opening H4 toward the substrate 100 overlaps with the orthographic projection of the second opening H2 toward the substrate 100; the color filter layer 700 is located in the third opening H3, and the color filter layer 700 is located on the side of the light shielding layer 600 away from the substrate 100, and the color filter layer 700 is located on the side of the light shielding layer 600 away from the substrate 100. The film layer 700 is provided with at least one fifth opening H5, the fifth opening H5 is located in the second area A2, and the orthographic projection of the fifth opening H5 toward the substrate 100 overlaps with the orthographic projection of the fourth opening H4 toward the substrate 100; the conductive layer 800 is located between the light-shielding layer 600 and the pixel defining layer 300, and the conductive layer 800 is located between the pixel defining layer 300 and the substrate 100, the orthographic projection of the conductive layer 800 toward the substrate 100 falls within the edge of the orthographic projection of the light-shielding layer 600 toward the substrate 100, and the orthographic projection of the conductive layer 800 toward the substrate 100 falls within the edge of the orthographic projection of the pixel defining layer 300 toward the substrate 100.

[0106] For example, Figures 1 to 9 As shown, there may be an encapsulation layer between the light shielding layer 600 and the cathode layer 500, wherein the encapsulation layer may include an organic encapsulation and an inorganic encapsulation. The conductive layer 800 includes a first conductive layer 801 and a second conductive layer 802, wherein the first conductive layer 801 is located between the light shielding layer 600 and the cathode layer 500, and the second conductive layer 802 is located between the pixel defining layer 300 and the substrate 100.

[0107] For example, the first conductive layer 801 may include a touch metal layer, which is located on a side of the encapsulation layer away from the substrate 100. The second conductive layer 802 may be used to transmit a driving signal, a scanning signal, a power signal, a reference voltage, etc. of the light emitting unit. Figures 1 to 9 As shown, the first conductive layer 801 may include a first touch metal layer TM1 and a second touch metal layer TM2. The second conductive layer 802 may include an M0 metal layer, an M1 metal layer, an M2 metal layer, an M3 metal layer and an M4 metal layer, and a metal interconnect structure electrically connected to any of the above metal layers M0 to M4.

[0108] It should be noted that by arranging the light-shielding layer 600 and the color film layer 700 on the side of the encapsulation layer away from the substrate 100, a CFOT (Color Filter On TFE) display panel can be formed, thereby improving the contrast and brightness of the display panel, reducing the display power consumption of the display panel, reducing the thickness of the display panel, improving the flexibility of the display panel, reducing the preparation cost of the display panel, and improving the display effect and display performance of the display panel.

[0109] like Figure 1 As shown, the width of the fourth opening H4 is greater than or equal to the width of the second opening H2.

[0110] The display panel provided in the embodiment of the present application can avoid the light-shielding layer 600 from blocking external light by setting the width of the fourth opening H4 to be greater than or equal to the width of the second opening H2, and can further increase the amount of light incident on the second opening H2, thereby further increasing the amount of light transmitted through the second opening H2, so as to improve the accuracy of the photosensitivity results, and further improve the photosensitivity performance of the display panel.

[0111] like Figure 3 As shown, in some feasible embodiments, the pixel defining layer 300 includes a first sub-pixel defining layer 310 and a second sub-pixel defining layer 320, and the first sub-pixel defining layer 310 is located between the substrate 100 and the second sub-pixel defining layer 320; the second opening H2 includes a first sub-opening H21 and a second sub-opening H22, the first sub-opening H21 is located in the first sub-pixel defining layer 310, and the second sub-opening H22 is located in the second sub-pixel defining layer 320, and the orthographic projection of the first sub-opening H21 toward the substrate 100 at least partially overlaps with the orthographic projection of the second sub-opening H22 toward the substrate 100; the width dimension of the fourth opening H4 is greater than or equal to the width dimension of the first sub-opening H21.

[0112] The display panel provided in the embodiment of the present application can avoid the light-shielding layer 600 from blocking external light by setting the width of the fourth opening H4 to be greater than or equal to the width of the second opening H2, and can further increase the amount of light incident on the bottom of the second opening H2, thereby further increasing the amount of light transmitted through the second opening H2, so as to improve the accuracy of the photosensitivity results, and further improve the photosensitivity performance of the display panel.

[0113] like Figure 1 As shown, in some feasible embodiments, the display panel further includes: a photosensitive device 900, which is located on a side of the substrate 100 away from the light-emitting layer 400, and the orthographic projection of the photosensitive device 900 toward the substrate 100 overlaps with the orthographic projection of the second opening H2 toward the substrate 100.

[0114] The display panel provided in the embodiment of the present application can be provided with a photosensitive function by arranging a photosensitive device 900 on a side of the substrate 100 away from the light-emitting layer 400, so as to sense the external light environment through the second opening H2. At the same time, by arranging the orthographic projection of the photosensitive device 900 toward the substrate 100 to overlap with the orthographic projection of the second opening H2 toward the substrate 100, the amount of light incident on the photosensitive device 900 can be further increased, the light utilization rate can be improved, and the accuracy of the photosensitive result of the photosensitive device 900 can be further improved. The photosensitivity performance of the display panel is improved.

[0115] In some feasible embodiments, the difference in size between at least one of the thickness of the cathode layer 530 at the bottom of the second opening H2 and the thickness of the cathode layer 520 on the sidewall of the second opening H2 and the thickness of the cathode layer 510 on the surface of the pixel defining layer 300 is in the range of 1 nm to 5 nm.

[0116] The display panel provided by the embodiment of the present application can avoid the size difference between at least one of the thickness of the cathode layer 530 at the bottom of the second opening H2 and the thickness of the cathode layer 520 on the sidewall of the second opening H2 and the thickness of the cathode layer 510 on the surface of the pixel defining layer 300 being too large, which increases the difficulty of preparing the cathode film and affects the preparation efficiency and preparation quality of the display panel. It can also avoid the size difference being too small, which reduces the light transmittance of the second opening H2, thereby improving the photosensitivity of the display panel.

[0117] like Fig.10 As shown, in a second aspect of the embodiment of the present application, a method for preparing a display panel is provided, comprising:

[0118] Step S110 , providing a substrate 100 , wherein the substrate 100 includes a first area A1 and a second area A2 .

[0119] Step S120 , forming a planarization layer 200 on one side of the substrate 100 .

[0120] Step S130, forming a pixel defining layer 300 on a side of the planarization layer 200 away from the substrate 100, wherein the pixel defining layer 300 is provided with a plurality of first openings H1 and at least one second opening H2, wherein the first openings H1 are located in the first area A1, and the second openings H2 are located in the second area A2, and the second openings H2 penetrate the pixel defining layer 300, or penetrate at least a portion of the planarization layer 200.

[0121] Step S140 , forming a light-emitting layer 400 on a side of the planarization layer 200 away from the substrate 100 , wherein the light-emitting layer 400 includes a plurality of light-emitting units, and each light-emitting unit is correspondingly located in the first opening H1 .

[0122] Step S150, forming a cathode layer 500 on a side of the light-emitting layer 400 away from the substrate 100 and in the second opening H2, wherein at least one of the thickness dimension of the cathode layer 530 at the bottom of the second opening H2 and the thickness dimension of the cathode layer 520 on the side wall of the second opening H2 is smaller than the thickness dimension of the cathode layer 510 on the surface of the pixel defining layer 300.

[0123] The method for preparing a display panel provided in an embodiment of the present application divides the display panel into a first area A1 and a second area A2, and sets a first opening H1 in the pixel defining layer 300 in the first area A1, so that the first opening H1 can be used to accommodate the light-emitting unit to realize the display of the display panel. At the same time, by setting a second opening H2 in the pixel defining layer 300 in the second area A2, the second opening H2 can be used as a photosensitive hole, so that external light can be incident on the inside of the display panel through the second opening H2. By making the second opening H2 pass through the pixel defining layer 300, it is possible to avoid the pixel defining layer 300 absorbing the incident light, and the light transmittance of the second opening H2 can be improved. At the same time, by making the second opening H2 pass through at least a portion of the planarization layer 200, the evaporation thickness of the cathode layer 500 at the bottom and sidewalls of the second opening H2 can be reduced during the evaporation process of the cathode layer 500. Further, by setting at least one of the thickness of the cathode layer 530 at the bottom of the second opening H2 and the thickness of the cathode layer 520 at the side wall of the second opening H2 to be smaller than the thickness of the cathode layer 510 on the surface of the pixel defining layer 300, the reflective ability of the cathode layer 500 at the bottom and side wall of the second opening H2 can be reduced, so that at least part of the external light can be incident on the planarization layer 200 and the substrate 100 through the cathode layer 500 at the bottom and side wall of the second opening H2. At the same time, the cathode layer 520 at the side wall of the second opening H2 can also reflect the incident external light to increase the amount of light incident on the cathode layer 530 at the bottom of the second opening H2, and the light transmittance of the cathode layer 530 at the bottom of the second opening H2 can be further increased. In this way, the reflection effect of the cathode layer 500 in the second opening H2 on the external light can be suppressed, the light transmittance of the second opening H2 can be improved, and the photosensitivity of the display panel can be further improved.

[0124] In some feasible embodiments, a cathode layer 500 is formed on a side of the light-emitting layer 400 away from the substrate 100 and in the second opening H2, including: forming the cathode layer 500 on a side of the light-emitting layer 400 away from the substrate 100 and in the second opening H2 through an evaporation process, wherein the evaporation concentration in the second opening H2 is less than the evaporation concentration on the surface of the pixel defining layer 300.

[0125] The method for preparing a display panel provided in an embodiment of the present application can make the thickness of the cathode layer 500 formed inside the second opening H2 during the evaporation process smaller than the thickness of the cathode layer 500 on the side of the light-emitting layer 400 away from the substrate 100 by making the evaporation concentration inside the second opening H2 lower than the evaporation concentration on the surface of the pixel defining layer 300. This can suppress the reflection of external light by the cathode layer 500 in the second opening H2, increase the amount of light incident on the cathode layer 530 at the bottom of the second opening H2, improve the light transmittance of the second opening H2, and further improve the photosensitivity of the display panel.

[0126] like Fig.11 As shown, a third aspect of an embodiment of the present application provides a display device, comprising: a display panel 1000 as described in any one of the first aspects above.

[0127] The display device provided by the embodiment of the present application divides the display panel 1000 into a first area A1 and a second area A2, and a first opening H1 is provided in the pixel definition layer 300 in the first area A1, so that the first opening H1 can be used to accommodate the light-emitting unit to realize the display of the display panel 1000. At the same time, by providing a second opening H2 in the pixel definition layer 300 in the second area A2, the second opening H2 can be used as a photosensitive hole, so that external light can be incident into the display panel 1000 through the second opening H2. By making the second opening H2 penetrate the pixel definition layer 300, it is possible to avoid the pixel definition layer 300 absorbing the incident light, and the light transmittance of the second opening H2 can be improved. At the same time, by making the second opening H2 penetrate at least a portion of the planarization layer 200, the evaporation thickness of the cathode layer 500 at the bottom and sidewall of the second opening H2 can be reduced during the evaporation process of the cathode layer 500. Further, by setting at least one of the thickness of the cathode layer 530 at the bottom of the second opening H2 and the thickness of the cathode layer 520 at the side wall of the second opening H2 to be smaller than the thickness of the cathode layer 510 on the surface of the pixel defining layer 300, the reflective ability of the cathode layer 500 at the bottom and side wall of the second opening H2 can be reduced, so that at least part of the external light can be incident on the planarization layer 200 and the substrate 100 through the cathode layer 500 at the bottom and side wall of the second opening H2. At the same time, the cathode layer 520 at the side wall of the second opening H2 can also reflect the incident external light to increase the amount of light incident on the cathode layer 530 at the bottom of the second opening H2, and the light transmittance of the cathode layer 530 at the bottom of the second opening H2 can be further increased. In this way, the reflection effect of the cathode layer 500 in the second opening H2 on the external light can be suppressed, the light transmittance of the second opening H2 can be improved, and the photosensitivity of the display panel 1000 can be further improved.

[0128] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0129] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features of the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0130] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A display panel, characterized in that: The display panel includes a first area and a second area, and the display panel includes: substrate; A planarization layer, located on one side of the substrate; a pixel defining layer, located on a side of the planarization layer away from the substrate, the pixel defining layer being provided with a plurality of first openings and at least one second opening, the first openings being located in the first region, the second openings being located in the second region, the second openings penetrating the pixel defining layer, or the second openings penetrating at least a portion of the planarization layer; A light-emitting layer, comprising a plurality of light-emitting units, wherein the light-emitting units are correspondingly located in the first openings; a cathode layer, located on a side of the light-emitting layer away from the substrate, and the cathode layer is located in the second opening; At least one of the thickness of the cathode layer at the bottom of the second opening and the thickness of the cathode layer at the sidewall of the second opening is smaller than the thickness of the cathode layer at the surface of the pixel defining layer.

2. The display panel according to claim 1, characterized in that: The thickness of the cathode layer at the bottom of the second opening is smaller than the thickness of the cathode layer at the surface of the pixel defining layer.

3. The display panel according to claim 2, characterized in that: When the second opening passes through the pixel defining layer, a width dimension of the second opening close to the substrate is greater than a width dimension of the second opening away from the substrate.

4. The display panel according to claim 3, characterized in that: The pixel definition layer includes a first sub-pixel definition layer and a second sub-pixel definition layer, wherein the first sub-pixel definition layer is located between the substrate and the second sub-pixel definition layer; The second opening includes a first sub-opening and a second sub-opening, the first sub-opening is located in the first sub-pixel defining layer, the second sub-opening is located in the second sub-pixel defining layer, and an orthographic projection of the first sub-opening toward the substrate at least partially overlaps with an orthographic projection of the second sub-opening toward the substrate; The width of the first sub-opening close to the substrate is greater than the width of the second sub-opening away from the substrate.

5. The display panel according to claim 4, characterized in that: In the direction from the substrate to the pixel definition layer, the width of the second sub-opening gradually decreases, and the width of the first sub-opening gradually decreases; or, In a direction from the substrate to the pixel defining layer, the width of the second sub-opening gradually decreases, and the width of the first sub-opening gradually increases.

6. The display panel according to claim 4, characterized in that: The first sub-pixel defining layer and the second sub-pixel defining layer are made of different materials; Wherein, the first sub-pixel defining layer includes a black material.

7. The display panel according to claim 2, characterized in that: When the second opening penetrates at least a portion of the planarization layer, the thickness of the cathode layer on the sidewall of the second opening is smaller than the thickness of the cathode layer on the surface of the pixel defining layer.

8. The display panel according to claim 7, characterized in that: The width of the second opening at a side close to the substrate is smaller than the width of the second opening at a side away from the substrate.

9. The display panel according to claim 8, characterized in that: In a direction from the substrate to the pixel defining layer, a width of the second opening gradually increases.

10. The display panel according to claim 7, characterized in that: The planarization layer includes two to three sub-planarization layers; The second opening penetrates at least one of the sub-planarization layers; or, The second opening includes a groove, and the groove is located in one of the sub-planarization layers that is at the largest distance from the substrate.

11. The display panel according to claim 1, characterized in that: Also includes: a light shielding layer, located on a side of the cathode layer away from the substrate, the light shielding layer being provided with a plurality of third openings and at least one fourth opening, the third opening being located in the first region, the fourth opening being located in the second region, the orthographic projection of the third opening toward the substrate overlapping with the orthographic projection of the first opening toward the substrate, and the orthographic projection of the fourth opening toward the substrate overlapping with the orthographic projection of the second opening toward the substrate; a color filter layer, located in the third opening, and located on a side of the light shielding layer away from the substrate, the color filter layer is provided with at least one fifth opening, the fifth opening is located in the second region, and an orthographic projection of the fifth opening toward the substrate overlaps with an orthographic projection of the fourth opening toward the substrate; A conductive layer is located between the light-shielding layer and the pixel defining layer, and the conductive layer is located between the pixel defining layer and the substrate, the orthographic projection of the conductive layer toward the substrate falls within the edge of the orthographic projection of the light-shielding layer toward the substrate, and the orthographic projection of the conductive layer toward the substrate falls within the edge of the orthographic projection of the pixel defining layer toward the substrate.

12. The display panel according to claim 11, characterized in that: The width of the fourth opening is greater than or equal to the width of the second opening.

13. The display panel according to claim 12, characterized in that: The pixel definition layer includes a first sub-pixel definition layer and a second sub-pixel definition layer, wherein the first sub-pixel definition layer is located between the substrate and the second sub-pixel definition layer; The second opening includes a first sub-opening and a second sub-opening, the first sub-opening is located in the first sub-pixel defining layer, the second sub-opening is located in the second sub-pixel defining layer, and an orthographic projection of the first sub-opening toward the substrate at least partially overlaps with an orthographic projection of the second sub-opening toward the substrate; A width of the fourth opening is greater than or equal to a width of the first sub-opening.

14. The display panel according to claim 1, characterized in that: Also includes: A photosensitive device is located on a side of the substrate away from the light-emitting layer, and an orthographic projection of the photosensitive device toward the substrate overlaps with an orthographic projection of the second opening toward the substrate.

15. The display panel according to claim 1, characterized in that: The difference between at least one of the thickness of the cathode layer at the bottom of the second opening and the thickness of the cathode layer at the sidewall of the second opening and the thickness of the cathode layer at the surface of the pixel defining layer ranges from 1 nm to 5 nm.

16. A method for preparing a display panel, characterized in that: include: providing a substrate comprising a first region and a second region; forming a planarization layer on one side of the substrate; forming a pixel definition layer on a side of the planarization layer away from the substrate, wherein the pixel definition layer is provided with a plurality of first openings and at least one second opening, wherein the first openings are located in the first region, the second openings are located in the second region, and the second openings penetrate the pixel definition layer, or penetrate at least a portion of the planarization layer; forming a light-emitting layer on a side of the planarization layer away from the substrate, wherein the light-emitting layer comprises a plurality of light-emitting units, and each of the light-emitting units is correspondingly located in the first opening; forming a cathode layer on a side of the light-emitting layer away from the substrate and in the second opening; At least one of the thickness of the cathode layer at the bottom of the second opening and the thickness of the cathode layer at the sidewall of the second opening is smaller than the thickness of the cathode layer at the surface of the pixel defining layer.

17. The method for manufacturing a display panel according to claim 16, characterized in that: The forming of a cathode layer on a side of the light emitting layer away from the substrate and in the second opening comprises: The cathode layer is formed on a side of the light emitting layer away from the substrate and in the second opening by an evaporation process, wherein the evaporation concentration in the second opening is lower than the evaporation concentration on the surface of the pixel defining layer.

18. A display device, characterized in that: include: A display panel as claimed in any one of claims 1 to 15.

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