Display panel and display device

Abstract

The invention provides a display panel and a display device, and relates to the technical field of display, the display panel comprises a plurality of sub-pixels, each sub-pixel comprises a pixel definition layer, a first electrode and a light-emitting function layer, the pixel definition layer comprises a pixel opening, and the pixel opening comprises at least one first groove; the first electrode is arranged between the pixel definition layer and the driving substrate; the light-emitting functional layer is at least arranged in the first groove, and the part, located in the first groove, of the surface of the side, away from the driving substrate, of the light-emitting functional layer comprises a first cambered surface; each first groove comprises a middle area and an edge area surrounding the middle area, and in each first groove, in the direction perpendicular to the plane where the driving substrate is located, the distance between the part, located in the middle area, of the first cambered surface and the driving substrate is larger than the distance between the part, located in the edge area, of the first cambered surface and the driving substrate. The display panel is suitable for preparation of a high-brightness display device.

Description

Display panel, display device Technical Field

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

[0002] With the rapid development of various display technologies, customers have increasingly higher requirements for display panel performance, and display products are developing towards ultra-high PPI (Pixels Per Inch) and ultra-high brightness.

[0003] To increase the brightness of a display panel, a microlens is typically disposed on the light-emitting side of a sub-pixel in the display panel. However, during the fabrication process of the microlens, the thermal reflow heating process can damage the light-emitting functional layer of the sub-pixel in the display panel, thereby reducing the display quality and the service life of the display panel. Currently, a new microlens design is urgently needed.

[0004] Summary of the Invention

[0005] The embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a display panel, comprising a driving substrate and a plurality of sub-pixels arranged in an array on the driving substrate, wherein the sub-pixels include:

[0007] A pixel definition layer comprising a pixel opening, wherein the pixel opening comprises at least one first groove;

[0008] a first electrode, disposed between the pixel definition layer and the drive substrate, wherein a portion of the first electrode serves as a bottom of the pixel opening;

[0009] a light-emitting functional layer, at least disposed in the first groove, wherein a portion of a surface of the light-emitting functional layer on a side away from the driving substrate and located in the first groove includes a first curved surface;

[0010] The first groove includes a middle area and an edge area surrounding the middle area. In each of the first grooves, along a direction perpendicular to the plane where the drive substrate is located, the distance between the portion of the first curved surface located in the middle area and the drive substrate is greater than the distance between the portion of the first curved surface located in the edge area and the drive substrate.

[0011] In the display panel provided in at least one embodiment of the present application, the ratio of the depth of the pixel opening along a direction perpendicular to the plane where the drive substrate is located to the maximum dimension of the pixel opening along a direction parallel to the plane where the drive substrate is located is greater than or equal to 0.3.

[0012] In the display panel provided in at least one embodiment of the present application, the ratio between the depth of the pixel opening along a direction perpendicular to the plane where the driving substrate is located and the maximum dimension of the pixel opening along a direction parallel to the plane where the driving substrate is located is greater than or equal to 0.3 and less than or equal to 0.8.

[0013] In the display panel provided by at least one embodiment of the present application, the pixel opening includes one first groove, and the maximum dimension of the sub-pixel along a direction parallel to the plane where the driving substrate is located is less than or equal to 2 μm.

[0014] In the display panel provided by at least one embodiment of the present application, the pixel opening includes at least two first grooves, and the maximum size of the sub-pixel along a direction parallel to the plane where the driving substrate is located is greater than or equal to 2 μm.

[0015] In the display panel provided in at least one embodiment of the present application, the pixel opening also includes a spacer located between two adjacent first grooves, and the ratio of the depth of the first groove along a direction perpendicular to the plane where the driving substrate is located to the maximum dimension of the first groove along a direction parallel to the plane where the driving substrate is located is greater than or equal to 0.3 and less than or equal to 0.8.

[0016] In the display panel provided in at least one embodiment of the present application, the ratio of the depth of the pixel opening along the direction perpendicular to the plane where the driving substrate is located to the maximum dimension of the pixel opening along the direction parallel to the plane where the driving substrate is located is greater than the ratio of the depth of the first groove along the direction perpendicular to the plane where the driving substrate is located to the maximum dimension of the first groove along the direction parallel to the plane where the driving substrate is located.

[0017] In the display panel provided by at least one embodiment of the present application, the spacer and the pixel definition layer are provided in the same layer.

[0018] In the display panel provided by at least one embodiment of the present application, the spacer and the first electrode are an integrated structure.

[0019] In the display panel provided in at least one embodiment of the present application, the first electrode includes a contact portion and a protrusion, a protrusion is provided between two adjacent contact portions, the contact portion serves as the bottom of the first groove, and the protrusion serves as the spacer.

[0020] In the display panel provided by at least one embodiment of the present application, the driving substrate includes a plurality of columnar connecting electrodes, at least one of the columnar connecting electrodes is in contact with and connected to the first electrode in the sub-pixel;

[0021] The orthographic projection of the columnar connecting electrode on the substrate of the driving substrate is located within the orthographic projection of the protrusion on the substrate, and one end of the columnar connecting electrode away from the substrate protrudes from the surface of the driving substrate close to the first electrode.

[0022] In the display panel provided in at least one embodiment of the present application, at least one break is provided on the spacer, and the light-emitting functional layers in two adjacent first grooves are connected at the position of the break.

[0023] In the display panel provided in at least one embodiment of the present application, the depth of the fracture in a direction perpendicular to the plane of the drive substrate is less than or equal to the height of the spacer in a direction perpendicular to the plane of the drive substrate.

[0024] In the display panel provided by at least one embodiment of the present application, an area enclosed by an orthographic projection of an outer contour of at least one of the fractures on the substrate overlaps with an orthographic projection of the columnar connecting electrode on the substrate.

[0025] In the display panel provided by at least one embodiment of the present application, the plurality of fractures are symmetrically distributed about the center of the sub-pixel.

[0026] In the display panel provided by at least one embodiment of the present application, the orthographic projection pattern of the spacer on the driving substrate includes a ring shape or a grid shape.

[0027] In the display panel provided in at least one embodiment of the present application, the light-emitting functional layer includes a plurality of light-emitting functional sublayers arranged in sequence along a direction away from the driving substrate, and along the direction away from the first electrode, the curvature of the surface of the plurality of light-emitting functional sublayers away from the driving substrate gradually decreases.

[0028] In the display panel provided in at least one embodiment of the present application, the sub-pixel includes a second electrode, the second electrode covers the light-emitting functional layer, the average curvature of the second electrode is smaller than the average curvature of the light-emitting functional layer, and the refractive index of the second electrode is smaller than the refractive index of the light-emitting functional layer.

[0029] In the display panel provided by at least one embodiment of the present application, a partial area of ​​the surface of the light-emitting functional layer in the first groove on a side away from the driving substrate is parallel to a surface of the first electrode on a side away from the driving substrate;

[0030] The ratio of the area of ​​the portion of the surface of the light-emitting functional layer away from the driving substrate and parallel to the surface of the first electrode away from the driving substrate to the area of ​​the surface of the light-emitting functional layer away from the driving substrate is less than or equal to 20%.

[0031] In the display panel provided in at least one embodiment of the present application, a ratio between a size of the pixel opening in a direction parallel to the plane where the drive substrate is located and a distance between two adjacent first electrodes in the same direction is in a range of 0.7 to 1.4.

[0032] In the display panel provided by at least one embodiment of the present application, the surface of the first electrode away from the driving substrate includes a second curved surface, the orthographic projection of the first curved surface on the substrate of the driving substrate is located within the orthographic projection of the second curved surface on the substrate, and the first curved surface and the second curved surface are oriented in opposite directions.

[0033] In the display panel provided in at least one embodiment of the present application, the second curved surface serves as the bottom of the pixel opening, the area of ​​the region enclosed by the orthographic projection of the outer contour of the second curved surface on the driving substrate is larger than the area of ​​the region enclosed by the orthographic projection of the outer contour of the edge of the pixel opening on the driving substrate, and the side wall of the pixel opening is provided with a side concave structure at a position close to the second curved surface.

[0034] In the display panel provided in at least one embodiment of the present application, the curvature of the second curved surface is smaller than the curvature of the first curved surface.

[0035] In the display panel provided in at least one embodiment of the present application, the pixel definition layer includes the pixel opening and a pixel recess located between two adjacent pixel openings;

[0036] The pixel recess is provided with a second groove, and an area enclosed by an orthographic projection of an outer contour of the second groove on the drive substrate falls within an area enclosed by an orthographic projection of an outer contour of a gap between two adjacent first electrodes on the drive substrate;

[0037] The ratio of the maximum dimension of the second groove along a direction parallel to the plane where the drive substrate is located to the depth of the second groove along a direction perpendicular to the plane where the drive substrate is located is less than or equal to the ratio of the maximum dimension of the first groove along a direction parallel to the plane where the drive substrate is located to the depth of the first groove along a direction perpendicular to the plane where the drive substrate is located.

[0038] In the display panel provided by at least one embodiment of the present application, the second groove divides the same pixel recess into two parts;

[0039] In a same direction parallel to the plane where the driving substrate is located, a ratio between a size of a portion of the pixel recess and a size of the second groove is in a range of 0.7 to 1.4.

[0040] In the display panel provided by at least one embodiment of the present application, the absolute value of the difference between the ratio of the size of a part of the pixel recess along a direction parallel to the plane where the driving substrate is located and the size of the second groove along the same direction, and the ratio of the size of the pixel opening along a direction parallel to the plane where the driving substrate is located and the distance between two adjacent first electrodes along the same direction is less than or equal to 0.1.

[0041] In the display panel provided in at least one embodiment of the present application, in the same direction parallel to the plane where the driving substrate is located, the absolute value of the size difference between two adjacent gaps is smaller than the absolute value of the size difference between two parts on the same pixel recess.

[0042] In the display panel provided in at least one embodiment of the present application, the plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, and the first sub-pixel, the second sub-pixel, and the third sub-pixel display different colors;

[0043] In a direction parallel to the plane of the drive substrate, an absolute value of a size difference between the gap between the first sub-pixel and the second sub-pixel and the gap between the second sub-pixel and the third sub-pixel is smaller than an absolute value of a size difference between the second groove between the first sub-pixel and the second sub-pixel and the second groove between the second sub-pixel and the third sub-pixel;

[0044] An absolute value of a size difference between the gap between the second sub-pixel and the third sub-pixel and the gap between the third sub-pixel and the first sub-pixel is smaller than an absolute value of a size difference between the second groove between the second sub-pixel and the third sub-pixel and the second groove between the third sub-pixel and the first sub-pixel.

[0045] In the display panel provided by at least one embodiment of the present application, in a direction parallel to the plane on which the drive substrate is located, an absolute value of a size difference between the gap between the first sub-pixel and the second sub-pixel and the gap between the second sub-pixel and the third sub-pixel is smaller than an absolute value of a size difference between the pixel recess between the first sub-pixel and the second sub-pixel and the pixel recess between the second sub-pixel and the third sub-pixel;

[0046] An absolute value of a size difference between the gap between the second sub-pixel and the third sub-pixel and the gap between the third sub-pixel and the first sub-pixel is smaller than an absolute value of a size difference between the pixel recess between the second sub-pixel and the third sub-pixel and the pixel recess between the third sub-pixel and the first sub-pixel.

[0047] In the display panel provided in at least one embodiment of the present application, a partial area of ​​the light-emitting functional layer is arranged in the second groove and on the surface of the pixel recessed portion away from the driving substrate, and the portion of the surface of the light-emitting functional layer away from the driving substrate located in the second groove includes a third curved surface; the curvature of the first curved surface is smaller than the curvature of the third curved surface.

[0048] In the display panel provided in at least one embodiment of the present application, the curvature of the first curved surface is greater than the curvature of a portion of the light-emitting functional layer disposed on a surface of the pixel recess away from the driving substrate.

[0049] In the display panel provided by at least one embodiment of the present application, the curvature of the light-emitting functional layer of at least one of the first sub-pixel and the second sub-pixel is greater than the curvature of the light-emitting functional layer of the third sub-pixel.

[0050] In the display panel provided in at least one embodiment of the present application, the area of ​​the light-emitting region of the first sub-pixel is smaller than the area of ​​the light-emitting region of the second sub-pixel, and the area of ​​the light-emitting region of the second sub-pixel is smaller than the area of ​​the light-emitting region of the third sub-pixel;

[0051] The curvature of the light-emitting functional layer of the first sub-pixel is greater than that of the light-emitting functional layer of the second sub-pixel, and the curvature of the light-emitting functional layer of the second sub-pixel is greater than that of the light-emitting functional layer of the third sub-pixel.

[0052] In the display panel provided in at least one embodiment of the present application, the sub-pixel includes a second electrode, an encapsulation layer, and a color filter pattern, the second electrode covers the light-emitting functional layer, the encapsulation layer covers the second electrode, and the color filter pattern is located on a side of the encapsulation layer away from the second electrode;

[0053] A fourth curved surface is provided at a portion of the encapsulation layer that overlaps with an orthographic projection of the first curved surface on the drive substrate. The curvature of the fourth curved surface is smaller than that of the first curved surface.

[0054] In the display panel provided in at least one embodiment of the present application, the color filter pattern is a lens structure, the lens structure covers the fourth curved surface, and the orthographic projection of the color filter pattern on the driving substrate covers the orthographic projection of the first curved surface on the driving substrate.

[0055] In the display panel provided in at least one embodiment of the present application, a light shielding pattern is provided between the color filter patterns of two adjacent sub-pixels, and a partial area of ​​the color filter pattern is provided on a side of the light shielding pattern away from the driving substrate;

[0056] An area enclosed by an orthographic projection of the outer contour of the second groove on the driving substrate falls within an orthographic projection of the light shielding pattern on the driving substrate.

[0057] In the display panel provided in at least one embodiment of the present application, there is an overlapping area between the color filter patterns of two adjacent sub-pixels, and the area enclosed by the orthographic projection of the outer contour of the second groove on the driving substrate falls within the orthographic projection of the overlapping area on the driving substrate.

[0058] In the display panel provided by at least one embodiment of the present application, in the same direction parallel to the plane where the drive substrate is located, the size of the overlapping area is greater than or equal to the size of the second groove.

[0059] In the display panel provided in at least one embodiment of the present application, a height of the color filter pattern along a plane perpendicular to the driving substrate is greater than a width of the color filter pattern along a plane parallel to the driving substrate.

[0060] In the display panel provided in at least one embodiment of the present application, the height of the overlapping area between the color filter patterns of two adjacent sub-pixels along the plane perpendicular to the driving substrate is greater than the width of the color filter pattern along the plane parallel to the driving substrate.

[0061] In a second aspect, an embodiment of the present application provides a display device comprising a display panel as described in any one of the first aspects.

[0062] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0064] FIG1 is an illustration of a method for manufacturing a display panel provided in an embodiment of the present application;

[0065] 2 to 6 are schematic diagrams of partial structures of five display panels provided in embodiments of the present application;

[0066] FIG7 is an enlarged view of a local structure of a pixel opening in FIG4 ;

[0067] 8 and 9 are schematic diagrams showing the positional arrangement of two types of columnar connecting electrodes provided in an embodiment of the present application;

[0068] 10 and 11 are schematic diagrams of partial structures of two display panels provided in embodiments of the present application;

[0069] 12 and 13 are schematic diagrams showing the arrangement of two types of columnar connecting electrodes provided in an embodiment of the present application;

[0070] 14 and 15 are schematic structural diagrams of two drive substrates provided in embodiments of the present application;

[0071] 16A to 19 are schematic diagrams of partial structures of five display panels provided in embodiments of the present application;

[0072] FIG20 is a partial enlarged schematic diagram of the overlapping area in FIG19;

[0073] 21 to 23 are schematic diagrams of partial structures of three display panels provided in embodiments of the present application;

[0074] FIG24 is a simplified structural diagram of a display panel with a single light-emitting sublayer provided by an embodiment of the present application;

[0075] 25 and 26 are simplified schematic diagrams of the structures of display panels with two double-layer light-emitting sublayers provided by embodiments of the present application;

[0076] FIG27 is a schematic structural diagram of a display device provided in an embodiment of the present application;

[0077] FIG28 is a schematic structural diagram of a pixel driving circuit provided in an embodiment of the present application;

[0078] FIG29 is a timing diagram of the pixel driving circuit in FIG28 ;

[0079] 30 to 33 are schematic top-view structures of four sub-pixels provided in embodiments of the present application. Specific embodiments

[0080] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0081] In the embodiments of the present application, words such as "first", "second", "third", and "fourth" are used to distinguish between identical or similar items with basically the same functions and effects. This is only for the purpose of clearly describing the technical solutions of the embodiments of the present application, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0082] In the embodiments of the present application, the terms "upper" and "lower" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0083] Throughout the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of the present application. Schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be included in any one or more embodiments or examples in any suitable manner.

[0084] In the embodiments of the present application, “a plurality of” means two or more, and “at least one” means one or more, unless otherwise clearly defined.

[0085] The features "parallel," "perpendicular," and "identical" used in the embodiments of the present application include features such as "parallel," "perpendicular," and "identical" in the strict sense, as well as "approximately parallel," "approximately perpendicular," and "approximately identical" that include certain tolerances, taking into account the measurement and tolerances associated with the measurement of a particular quantity (e.g., limitations of the measurement system), and represent within an acceptable range of deviation for a particular value determined by a person of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of the stated value.

[0086] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, that is, meaning "including, but not limited to."

[0087] In the embodiments of this application, "same layer" refers to the relationship between multiple film layers formed from the same material after the same step (e.g., a one-step patterning process). "Same layer" here does not always mean that the thickness of multiple film layers is the same or the height of multiple film layers in the cross-sectional view is the same. Polygons in this specification are not strictly defined and can be approximate triangles, parallelograms, trapezoids, pentagons, or hexagons, etc., and some small deformations due to tolerances may exist.

[0088] Existing silicon-based OLED (Organic Light Emitting Diode) display panels cannot meet the high brightness and high PPI requirements of AR and VR. There are currently two main solutions. One of them is to set a microlens array structure on the light-emitting side of the light-emitting functional layer of the sub-pixel. However, the process of making microlenses is complicated and has poor stability. The heat reflow process requires the microlens material to be heated to about 100°C, and the high temperature has an adverse effect on the light-emitting material, thereby causing the failure of the OLED device. Another solution is to set a microlens array structure on the cover plate of the display panel, and then assemble the light-emitting substrate and the cover plate together through an alignment process to form a display panel. However, for high PPI (Pixels Per Inch) OLED display panels, the accuracy of the alignment process makes it difficult to achieve precise alignment of each sub-pixel, and inaccurate alignment is very likely to occur, which greatly reduces the yield of the preparation process.

[0089] Based on this, an embodiment of the present application provides a display panel and a display device, which display panel includes a driving substrate and a plurality of sub-pixels arranged in an array on the driving substrate, the sub-pixels including a pixel definition layer, a first electrode and a light-emitting function layer; the pixel definition layer includes a pixel opening, and the pixel opening includes at least one first groove; the first electrode is arranged between the pixel definition layer and the driving substrate, and a partial area of ​​the first electrode serves as the bottom of the pixel opening; the light-emitting function layer is at least arranged in the first groove, and the portion of the surface of the light-emitting function layer away from the driving substrate located in the first groove includes a first curved surface; wherein the first groove includes a middle area and an edge area surrounding the middle area, and in each first groove, along a direction perpendicular to the plane where the driving substrate is located, the distance between the portion of the first curved surface located in the middle area and the driving substrate is greater than the distance between the portion of the first curved surface located in the edge area and the driving substrate.

[0090] In this way, by setting the pixel opening to include at least one first groove, the light-emitting functional layer is at least arranged in the first groove, and the portion of the surface of the light-emitting functional layer away from the driving substrate and located in the first groove includes a first curved surface, and in each first groove, along the direction perpendicular to the plane where the driving substrate is located, the distance between the portion of the first curved surface located in the middle area and the driving substrate is greater than the distance between the portion of the first curved surface located in the edge area and the driving substrate; so that the light-emitting surface of the light-emitting functional layer in each first groove in the pixel opening forms a structure similar to a convex lens, and there is no need to additionally set a microlens array structure on the light-emitting side of the sub-pixel light-emitting functional layer, which saves process steps and avoids damage to the light-emitting functional layer caused by the heat reflow process of the microlens process in the related technology, while also greatly improving the light-emitting efficiency of the display panel, improving the brightness of the display panel, and thus improving the display effect.

[0091] The display panel and the display device provided in the embodiments of the present application will be specifically introduced and described below with reference to the accompanying drawings.

[0092] An embodiment of the present application provides a display panel, as shown in FIG. 2 to FIG. 6 , FIG. 10 to FIG. 11 , FIG. 16A to FIG. 19 , and FIG. 21 to FIG. 23 . The display panel includes a driving substrate 1 and a plurality of sub-pixels arranged in an array on the driving substrate 1 . The sub-pixels include:

[0093] The pixel definition layer 3 includes a pixel opening K, and the pixel opening K includes at least one first groove C1;

[0094] The first electrode 2 is provided between the pixel definition layer 3 and the driving substrate 1 , and a portion of the first electrode 2 serves as the bottom of the pixel opening K;

[0095] The light-emitting functional layer 4 is at least disposed in the first groove C1 , and a portion of the surface of the light-emitting functional layer 4 away from the driving substrate 1 and located in the first groove C1 includes a first curved surface HM1 ;

[0096] In which, the first groove C1 includes a middle area and an edge area surrounding the middle area. In each first groove C1, as shown by the mark in Figure 2, along the direction perpendicular to the plane where the drive substrate 1 is located, the distance J1 between the part of the first curved surface HM1 located in the middle area and the drive substrate 1 is greater than the distance J2 between the part of the first curved surface HM1 located in the edge area and the drive substrate 1.

[0097] In an exemplary embodiment, the display panel may be an organic light emitting diode (OLED) display panel.

[0098] In an exemplary embodiment, the driving substrate 1 includes a substrate 100 and a driving unit as shown in FIG. 14 or 15 .

[0099] In some examples, the substrate 100 may be made of one or more materials selected from the group consisting of glass, polyimide, polycarbonate, polyacrylate, polyetherimide, and polyethersulfone, and this embodiment includes but is not limited thereto.

[0100] In some examples, substrate 100 may be a rigid substrate or a flexible substrate;

[0101] When the substrate is a rigid substrate, the substrate may include a glass substrate or a silicon material substrate.

[0102] For example, the substrate 100 may be a silicon-based substrate (Si Substrate).

[0103] Specifically, the silicon-based substrate can be a P-type single-crystal silicon substrate, or an N-type single-crystal silicon substrate, which can be determined based on the actual product. In this case, the display panel is a silicon-based OLED display product, which is widely used in the fields of near-eye display, virtual reality (VR), and augmented reality (AR), especially AR / VR head-mounted display devices.

[0104] In an exemplary embodiment, the driving unit may include two transistors and one capacitor (2T1C); alternatively, the driving unit may include four transistors and one capacitor (4T1C); alternatively, the driving unit may include five transistors and one capacitor (5T1C). The embodiments of the driving unit 1 in this application are not limited thereto. In other embodiments, the driving unit may further include more transistors, more capacitors, or other devices.

[0105] In addition, the type of transistor in the driving unit is not limited here. For example, the transistor may include an N-type transistor; or the transistor may include a P-type transistor; or the transistor may include both an N-type transistor and a P-type transistor.

[0106] In the embodiments of the present application, the driving unit may be understood as a pixel driving circuit.

[0107] The arrangement of the plurality of sub-pixels is not limited here, and may be any arrangement in the related art. For details, please refer to the introduction of the related art.

[0108] It should be noted that Figures 2, 5, 6, 10, 11 and 22 all show structural schematic diagrams containing one sub-pixel; Figures 3, 4, 16A to 19, 21 and 23 all show structural schematic diagrams containing two sub-pixels.

[0109] The display colors of the above-mentioned multiple sub-pixels are not limited here.

[0110] In some embodiments, the display colors of the sub-pixels in the display panel are the same; in some embodiments, the display panel includes multiple sub-pixels that display different colors, for example, red sub-pixels, green sub-pixels, and blue sub-pixels.

[0111] In an exemplary embodiment, each sub-pixel includes a light-emitting device, which includes a light-emitting functional layer 4 and a first electrode 2 and a second electrode 5 located on both sides of the light-emitting functional layer 4; wherein the first electrode 2 is located between the light-emitting functional layer 4 and the driving substrate 1, and at least a portion of the second electrode 5 is located on the side of the light-emitting functional layer 4 away from the driving substrate 1.

[0112] In an exemplary embodiment, the light-emitting functional layer 4 includes multiple light-emitting functional sublayers. It should be noted that the light-emitting functional layer 5 does not only include a film layer that directly emits light, but also includes functional film layers for auxiliary light emission, such as a hole transport layer, an electron transport layer, etc.

[0113] There is no limitation on the light emitting colors of the above-mentioned multiple light emitting devices.

[0114] In an exemplary embodiment, the light-emitting colors of all light-emitting devices are the same, for example, all light-emitting devices emit blue light; for another example, all light-emitting devices emit white light; in this case, when used as a display, a color conversion layer needs to be set on the light-emitting side of the light-emitting device, for example, a color filter (Color Filter), such as a red filter, a green filter and a blue filter, can be set on the light-emitting side of the light-emitting device; for another example, quantum dot layers of different colors can be set on the light-emitting side of the light-emitting device, such as a red quantum dot layer, a green quantum dot layer and a white resin layer, the blue light emitted by the light-emitting functional layer passes through the red quantum dot layer and then emits red light, the blue light emitted by the light-emitting functional layer passes through the green quantum dot layer and then emits green light, and the blue light emitted by the light-emitting functional layer passes through the white resin layer and then emits blue light, thereby realizing a colored display.

[0115] In an exemplary embodiment, the display panel includes a plurality of light-emitting devices emitting different colors, for example, a red light-emitting device, a green light-emitting device, and a blue light-emitting device.

[0116] It should be noted that the luminous color of the light-emitting device can be determined by setting the material of the light-emitting functional layer 4 .

[0117] FIG25 and FIG26 are schematic structural diagrams showing that the light-emitting functional layer 4 in the display panel includes two light-emitting sub-layers.

[0118] Exemplarily, as shown in FIG. 25 and FIG. 26 , the light emitting color of each light emitting device in the display panel is white.

[0119] Illustratively, as shown in FIG26 , the material of each guest sublayer 1K in the light-emitting sublayer 1B includes a blue fluorescent material; the material of some guest sublayers 1K in the light-emitting sublayer 1YG includes a green phosphorescent material and a yellow phosphorescent material.

[0120] Illustratively, as shown in FIG25 , the material of each guest sublayer 1K in the light-emitting sublayer 1B includes a blue fluorescent material; the material of some guest sublayers 1K in the light-emitting sublayer 1RG includes a green phosphorescent material and a red phosphorescent material.

[0121] The display panel further includes a drive substrate 1 (BP) and a color filter CF, for example, including a red filter pattern CF-R, a green filter pattern CF-G, and a blue filter pattern CF-B. Of course, the display substrate may also include other structures and components. For details, please refer to the relevant art and will not be repeated here.

[0122] In addition, FIG24 shows a schematic structural diagram of the light-emitting functional layer 4 in the display panel including a light-emitting sublayer.

[0123] In some examples, the first electrode 2 can be made of a metal material, such as any one or more of magnesium (Mg), silver (Ag), copper (Cu), aluminum (Al), titanium (Ti) and molybdenum (Mo), or an alloy material of the above metals, such as aluminum neodymium alloy (AlNd) or molybdenum niobium alloy (MoNb).

[0124] In some examples, the second electrode 5 can be made of any one or more of magnesium (Mg), silver (Ag), and aluminum (Al), or an alloy made of any one or more of the above metals, or a transparent conductive material.

[0125] For example, the first electrode 2 may be an anode (CA), and the second electrode 5 may be a cathode (CTD); multiple sub-pixels may share the second electrode 5. For example, the cathode may be formed of a material with high conductivity and low work function, such as a metal material. For example, the anode may be formed of a transparent conductive material with a high work function.

[0126] In an exemplary embodiment, the above-mentioned pixel definition layer 3 is used to serve as a spacing for the light-emitting functional layer 4 in two adjacent sub-pixels, wherein the pixel opening K in the pixel definition layer 3 is also called the pixel opening area, which is the area in the sub-pixel that actually emits light.

[0127] It should be noted that, since a partial area of ​​the first electrode 2 serves as the bottom of the pixel opening K, there is no limitation here on whether the bottom of the above-mentioned pixel opening K is a flat surface or a curved surface; for example, the bottom of the above-mentioned pixel opening K (that is, a partial area of ​​the surface of the first electrode 2 away from the driving substrate 1) is a flat surface.

[0128] In an exemplary embodiment, the thickness of the pixel definition layer 3 is greater than the thickness of the organic light emitting layer 4 .

[0129] In an exemplary embodiment, the pixel definition layer 3 may include one sub-layer.

[0130] For example, the material of the pixel definition layer 3 may include an organic material, such as polyimide, acrylic, or polyethylene terephthalate.

[0131] In an exemplary embodiment, the pixel definition layer 3 may include a plurality of sub-layers, for example, a first sub-layer, a second sub-layer, and a third sub-layer.

[0132] Exemplarily, the material of the pixel definition layer 3 may include an inorganic material, such as at least one of silicon oxide, silicon nitride, and silicon oxynitride.

[0133] For example, the material of the first sublayer of the pixel definition layer 3 is silicon oxide, the material of the second sublayer of the pixel definition layer 3 is silicon nitride, and the material of the third sublayer of the pixel definition layer 3 is silicon oxide.

[0134] In some embodiments, as shown in FIG. 2 to FIG. 4 , one pixel opening K includes one first groove C1 ; in other embodiments, as shown in FIG. 5 to FIG. 6 , one pixel opening K includes multiple first grooves C1 , where multiple includes two or more.

[0135] In the case that the sizes of the pixel openings K are related, the more the number of first grooves C1 in the same pixel opening K is, the greater the curvature of the first curved surface HM1 formed by the light-emitting functional layer 4 in each first groove C1 is.

[0136] The following, with reference to FIG1 , explains why the portion of the surface of the light-emitting functional layer 4 located within the first groove C1 on the side away from the driver substrate 1 can form the first curved surface HM1. In the actual display panel manufacturing process, an evaporation source A forms the light-emitting functional layer 4 on the driver substrate 1 through the action of a mask. However, because the evaporation source A and the openings on the mask are not aligned, a shadow effect is easily generated, whereby the light-emitting functional layer 4 appears thick in the middle and thin at the edges. This effect is generally not very noticeable in OLED light-emitting devices with larger pixel sizes. However, in silicon-based microdisplay panels, due to the extremely small sub-pixel size (5μm to 10μm), the evaporation shadow effect is more pronounced. In this case, by providing at least one first groove C1 in the pixel opening K, the number of first grooves C1 in the same pixel opening K is determined based on the size effect, so that the first curved surface HM1 can be formed on the surface of the light-emitting functional layer 4 on the side away from the driver substrate 1 within each first groove C1 of the pixel opening K.

[0137] The specific boundaries between the middle area and the edge area in the first groove C1 are not limited here and can be determined according to the actual size of the first groove C1.

[0138] In the display panel provided in the embodiment of the present application, since in each first groove C1, as shown by the mark in Figure 2, along the direction perpendicular to the plane where the driving substrate 1 is located, the distance J1 between the part of the first curved surface HM1 located in the middle area and the driving substrate 1 is greater than the distance J2 between the part of the first curved surface HM1 located in the edge area and the driving substrate 1, this makes each first curved surface HM1 in the first groove C1 form a structure similar to a convex lens, thereby producing a converging effect on the light emitted by the light-emitting functional layer 4 within the range of the first groove C1, and there is no need to additionally set a microlens array structure on the light-emitting side of the sub-pixel light-emitting functional layer, which saves process steps and avoids damage to the light-emitting functional layer during the thermal reflow process of the microlens process in the related technology, while also greatly improving the light-emitting efficiency of the display panel, improving the brightness of the display panel, and thus improving the display effect.

[0139] In an exemplary embodiment, the light emitting functional layer 4 (EL) includes at least one light emitting sublayer (EML), for example, the light emitting functional layer 4 includes one light emitting sublayer (EML); or, the light emitting functional layer 4 includes two light emitting sublayers (EML).

[0140] When the light-emitting functional layer 4 includes at least two light-emitting sub-layers, the light-emitting functional layer 4 further includes a plurality of functional sub-layers along a direction perpendicular to the driving substrate 1 .

[0141] For example, the multiple sub-functional layers include a hole injection layer, a hole transport layer, a first light-emitting sublayer, an electron transport layer, a charge generation layer, a hole transport layer, a second light-emitting sublayer, an electron transport layer, a charge generation layer, a hole transport layer, a third light-emitting sublayer, an electron transport layer, and an electron injection layer, which are arranged in sequence on the anode.

[0142] For example, a hole injection layer, a hole transport layer, a first light-emitting sublayer, an electron transport layer, a charge generation layer, a hole transport layer, a second light-emitting sublayer, an electron transport layer, and an electron injection layer. Of course, as shown in FIG25 or FIG26 , a hole blocking layer HBL may be provided between the second light-emitting sublayer and the electron transport layer; or an electron blocking layer may be provided between the first light-emitting sublayer and the hole transport layer.

[0143] The structure of at least two light-emitting sublayers is called a Tandem EL design. For its specific structure, reference may be made to the introduction in the relevant art and will not be repeated here.

[0144] In addition, film layers such as the hole transport layer (HTL), electron blocking layer (EBL), hole injection layer (HIL), electron transport layer (ETL) and electron injection layer (EIL) can be collectively referred to as common layers. The common layers of all sub-pixels in the display panel can be shared, that is, the common layers of any two adjacent sub-pixels are connected as one.

[0145] In the display panel provided in at least one embodiment of the present application, as shown in Figures 2 to 6, Figures 10 to 11, Figures 16A to 19, and Figures 21 to 23, the ratio of the depth h1 of the pixel opening K along the direction perpendicular to the plane where the driving substrate 1 is located to the maximum dimension d1 of the pixel opening K along the direction parallel to the plane where the driving substrate 1 is located is greater than or equal to 0.3.

[0146] Exemplarily, a ratio of a depth h1 of the pixel opening K in a direction perpendicular to the plane where the drive substrate 1 is located to a maximum dimension d1 of the pixel opening K in a direction parallel to the plane where the drive substrate 1 is located is greater than or equal to 0.4.

[0147] In the actual process of preparing the display panel, according to the shadow effect described above, when the depth h1 and width d1 of the pixel opening K satisfy h1 / d1≥0.3, it can be ensured that the surface of the light-emitting functional layer 4 formed (evaporated or deposited) in the pixel opening K away from the driving substrate 1 has a first curved surface HM1, and the distance J1 between the part of the first curved surface HM1 located in the middle area and the driving substrate 1 is greater than the distance J2 between the part of the first curved surface HM1 located in the edge area and the driving substrate 1; in this way, it can be ensured that it forms a convex lens or a structure similar to a convex lens, thereby converging the light.

[0148] However, in the subsequent preparation process, the inventors found that when the depth h1 and width d1 of the pixel opening K satisfy h1 / d1>0.8, the second electrode 5 is difficult to form a continuous structure and is prone to local breakage. Therefore, in order to improve the preparation yield of the display panel provided in the embodiments of the present application; in the display panel provided in at least one embodiment of the present application, as shown in Figures 2 to 6, Figures 10 to 11, Figures 16A to 19, and Figures 21 to 23, the ratio of the depth h1 of the pixel opening K along the direction perpendicular to the plane where the driving substrate 1 is located to the maximum dimension d1 of the pixel opening K along the direction parallel to the plane where the driving substrate 1 is located is set to be greater than or equal to 0.3 and less than or equal to 0.8, that is, 0.8≥h1 / d1≥0.3.

[0149] Illustratively, according to the requirement for the curvature of the first arc surface HM1, 0.7≥h1 / d1≥0.3, 0.7≥h1 / d1≥0.4, 0.65≥h1 / d1≥0.3, 0.5≥h1 / d1≥0.3, 0.65≥h1 / d1≥0.4, or 0.65≥h1 / d1≥0.5 can be set.

[0150] In the display panel provided in at least one embodiment of the present application, as shown in Figures 2, 3, 4, 16A, 16B, 17, 19, 21 and 23, the pixel opening K includes a first groove C1, and the maximum size of the sub-pixel along a direction parallel to the plane where the driving substrate 1 is located is less than or equal to 2μm.

[0151] In an exemplary embodiment, when the maximum dimension of the sub-pixel along a direction parallel to the plane where the driving substrate 1 is located is less than or equal to 2 μm, in the actual process of preparing the display panel, a shadow effect can occur in the pixel opening K of almost every sub-pixel, so that the light-emitting functional layer 4 formed in the pixel opening K appears thick in the middle and thin on both sides, that is, the first curved surface HM1 described above can be formed. Therefore, there is no need to set multiple first grooves C1 in the same pixel opening K to aggravate the size effect, and it can be ensured that a convex lens-like structure can be formed inside each sub-pixel, which has a converging effect on the light emitted by the light-emitting functional layer 4.

[0152] In this way, there is no need to additionally set up a microlens array structure on the light-emitting side of the sub-pixel light-emitting functional layer, which saves process steps and avoids damage to the light-emitting functional layer caused by the thermal reflow process of the microlens process in the related technology. At the same time, it can also greatly improve the light-emitting efficiency of the display panel, increase the brightness of the display panel, and thus improve the display effect.

[0153] In the display panel provided in at least one embodiment of the present application, as shown in Figures 5, 6, 10, 11, 18 and 22, the pixel opening K includes at least two first grooves C1, and the maximum size of the sub-pixel along a direction parallel to the plane where the driving substrate 1 is located is greater than or equal to 2μm.

[0154] In an exemplary embodiment, when the maximum dimension of the sub-pixel along the direction parallel to the plane where the driving substrate 1 is located is greater than or equal to 2 μm, in the actual process of preparing the display panel, it cannot be ensured that a shadow effect occurs in each pixel opening K, and it cannot be ensured that the light-emitting functional layer 4 formed in each pixel opening K appears thick in the middle and thin on both sides; therefore, in order to aggravate the shadow effect, a pixel opening K is provided to include at least two first grooves C1, and the maximum dimension of the first groove C1 in the direction parallel to the plane where the driving substrate 1 is located is smaller than the maximum dimension of the sub-pixel in the direction parallel to the plane where the driving substrate 1 is located, thereby greatly aggravating the shadow effect.

[0155] There is no limit on the specific number of first grooves C1 included in the same pixel opening K. In practical applications, the larger the size of the sub-pixel, the more first grooves C1 are included in the same pixel opening K, so as to ensure the shadow effect and ensure that a first curved surface HM1 similar to a convex lens structure can be formed in each first groove C1.

[0156] In the display panel provided in at least one embodiment of the present application, as shown in Figures 5, 6, 10, 11, 18 and 22, the pixel opening K further includes a spacer 6 located between two adjacent first grooves C1, and the ratio of the depth h1' of the first groove C1 along a direction perpendicular to the plane where the drive substrate 1 is located to the maximum dimension d1' of the first groove C1 along a direction parallel to the plane where the drive substrate 1 is located is greater than or equal to 0.3 and less than or equal to 0.8, that is, 0.8≥h1' / d1'≥0.3 is set.

[0157] Illustratively, 0.7≥h1' / d1'≥0.3, 0.7≥h1' / d1'≥0.4, 0.65≥h1' / d1'≥0.3, 0.5≥h1' / d1'≥0.3, 0.65≥h1' / d1'≥0.4, or 0.65≥h1' / d1'≥0.5 may be set.

[0158] By setting the ratio of the height depth h1' of the first groove C1 spacer 6 in the direction perpendicular to the plane where the drive substrate 1 is located to the maximum dimension d1' of the first groove C1 in the direction parallel to the plane where the drive substrate 1 is located to be greater than or equal to 0.3 and less than or equal to 0.8, it can be ensured that the surface of the light-emitting functional layer 4 in each first groove C1 in the pixel opening K on the side away from the drive substrate 1 has a first curved surface HM1, and the distance J1 between the part of the first curved surface HM1 located in the middle area and the drive substrate 1 is greater than the distance J2 between the part of the first curved surface HM1 located in the edge area and the drive substrate 1; in this way, it can be ensured that it forms a convex lens or a structure similar to a convex lens, thereby converging light.

[0159] In the display panel provided in at least one embodiment of the present application, as shown in Figures 5, 6, 10, 11, 18 and 22, the ratio of the depth h1 of the pixel opening K along the direction perpendicular to the plane where the drive substrate 1 is located to the maximum dimension d1 of the pixel opening K along the direction parallel to the plane where the drive substrate 1 is located (i.e., h1 / d1) is greater than the ratio of the depth h1' of the first groove C1 along the direction perpendicular to the plane where the drive substrate 1 is located to the maximum dimension d1' of the first groove along the direction parallel to the plane where the drive substrate is located (h1' / d1'); that is, h1 / d1>h1' / d1'.

[0160] In an embodiment of the present application, when h1 / d1>h1' / d1' is set, due to the large depth-to-width ratio of the pixel opening, at least one sublayer in the light-emitting functional layer 4 at a local position of the pixel definition layer 3 between the pixel openings K of two adjacent sub-pixels can be disconnected, thereby disconnecting the light-emitting functional layer 4 of the two adjacent sub-pixels at a local position of the pixel definition layer 3 between the two adjacent pixel openings, effectively avoiding light crosstalk between the two adjacent sub-pixels.

[0161] In the display panel provided by at least one embodiment of the present application, as shown in FIG. 5 or FIG. 6 , the spacer 6 and the pixel definition layer 3 are provided in the same layer.

[0162] The same-layer arrangement means that the spacer 6 and the pixel definition layer 3 are prepared in the same step using the same process, and the raw materials used are the same, and the materials of the obtained finished products are also the same.

[0163] In some embodiments, the height of the spacer 6 along the direction perpendicular to the plane of the drive substrate 1 is less than or equal to the distance between the first electrode 2 along the direction perpendicular to the plane of the drive substrate 1 and the surface of the pixel definition layer 3 away from the drive substrate 1 .

[0164] In the display panel provided by at least one embodiment of the present application, as shown in FIG. 10 and FIG. 11 , the spacer 6 and the first electrode 2 are an integrated structure.

[0165] The integrated structure means that the spacer 6 and the first electrode 2 can be connected as a whole and are made of the same material.

[0166] In the display panel provided in at least one embodiment of the present application, as shown in Figures 10 and 11, the first electrode 2 includes a contact portion 21 and a protrusion 22, and a protrusion 22 is provided between two adjacent contact portions 21. The contact portion 21 serves as the bottom of the first groove C1, and the protrusion 22 serves as the spacer 6.

[0167] The contact portion 21 refers to a portion of the first electrode 2 that is in direct contact with the light-emitting functional layer 4 , and the protrusion 22 and the spacer 6 have the same structure.

[0168] In the display panel provided in at least one embodiment of the present application, as shown in Figures 11 to 15, the driving substrate 1 includes a plurality of columnar connecting electrodes 7, at least one columnar connecting electrode 7 is in contact with and connected to the first electrode 2 in the sub-pixel; the orthographic projection of the columnar connecting electrode 7 on the substrate of the driving substrate 1 is located within the orthographic projection of the protrusion 22 on the substrate, and the end of the columnar connecting electrode 7 away from the substrate protrudes from the surface of the driving substrate 1 on the side close to the first electrode 2.

[0169] In an exemplary embodiment, one end of the columnar connecting electrode 7 away from the substrate may be embedded in the first electrode 2 .

[0170] In an exemplary embodiment, when the driving substrate 1 is a silicon-based driving substrate, the driving substrate 1 includes a plurality of columnar connecting electrodes 7 (also referred to as tungsten holes) as shown in Figures 11 to 13, which are used to electrically connect the pixel driving circuit in the driving substrate 1 and the first electrode 2 together.

[0171] FIG28 shows a schematic structural diagram of a pixel driving circuit, wherein the pixel driving circuit includes: a driving module CC2, a first control module CC5, a second control module CC4, an input module 1, and a compensation module CC3;

[0172] The driving module 2 is electrically connected to the first node G, the second node S and the anode of the light-emitting device CC6, respectively, and is configured to, under the control of the voltage of the first node G, conduct the path between the second node S and the anode, and generate a current in the path for making the light-emitting device CC6 emit light; the second node S is coupled to the first power signal line ELVDD; the first control module CC5 is electrically connected to the first control signal line AZ, the second power signal line VSS and the anode of the light-emitting device CC6, respectively, and is configured to, under the control of the first control signal transmitted by the first control signal line AZ, transmit the second power signal transmitted by the second power signal line VSS to the anode; the second control module CC4 is electrically connected to the first power signal line ELVSS, the second control signal line DS and the driving module CC2, respectively, and is configured to transmit the second power signal transmitted by the second control signal line DS to the anode. Under the control of the second control signal, the first power signal transmitted in the first power signal line ELVDD is transmitted to the driving module CC2, and a current for making the light-emitting device CC6 emit light is generated in the auxiliary path; the voltage of the first power signal is greater than the voltage of the second power signal; the input module CC1 is electrically connected to the gate line WS, the data line DL and the first node G, respectively, and is configured to write the data signal transmitted by the data line DL to the first node G under the control of the scan signal transmitted by the gate line WS; the compensation module CC3 is electrically connected to the first node G, the second node S and the first power signal line ELVDD, respectively, and is configured to compensate for the threshold voltage of the driving module CC2.

[0173] Specifically, as shown in FIG28 , the input module CC1 includes a first transistor T1, the driving module CC2 includes a driving transistor DMOS, the second control module CC4 includes a second transistor T2, and the first control module CC5 includes a third transistor T3; the gate of the first transistor T1 is electrically connected to the gate line WS, the source of the first transistor T1 is electrically connected to the data line DL, and the drain of the first transistor T1 is electrically connected to the gate of the driving transistor DMOS; the gate of the second transistor T2 is electrically connected to the second control signal line DS, the source of the second transistor T2 is electrically connected to the first power signal line ELVDD, and the drain of the second transistor T2 is electrically connected to the gate of the driving transistor DMOS. The source is electrically connected; the gate of the third transistor T3 is electrically connected to the first control signal line AZ, the source of the third transistor T3 is electrically connected to the drain of the driving transistor DMOS, and the drain of the third transistor T3 is electrically connected to the second power signal line VSS; the compensation module CC3 includes a first capacitor C1 and a second capacitor C2, the first plate of the first capacitor C1 is electrically connected to the source of the driving transistor DMOS, and the second plate of the first capacitor C1 is electrically connected to the gate of the driving transistor DMOS; the first plate of the second capacitor C2 is electrically connected to the source of the driving transistor DMOS, and the second plate of the second capacitor C2 is electrically connected to the first power signal line ELVDD.

[0174] FIG29 shows a signal timing diagram of the operation process of the pixel driving circuit shown in FIG28 . As shown in FIG29 , the operation process of the pixel driving circuit includes four stages.

[0175] The following takes the pixel driving circuit shown in FIG28 as an example in which the third transistor T3 is an N-type MOS tube and the other transistors are P-type MOS tubes, and describes the working principle of the pixel driving circuit in combination with the signal timing diagram shown in FIG29 .

[0176] 1. In the first stage H1 (Vofs writing stage, also called initialization stage), as shown in FIG29 , a low-level second control signal is input to the second control signal line DS, a low-level gate drive signal (also called scanning signal) is input to the gate line WS, and a high-level first control signal is input to the first control signal line AZ;

[0177] The transistor connected to the second control signal line DS receives a low-level second control signal, the transistor connected to the gate line WS receives a low-level gate drive signal, the transistor connected to the first control signal line AZ receives a low-level first control signal, the data line DL receives the Vofs voltage signal, the first transistor T1, the second transistor T2, and the third transistor T3 are turned on, the voltage value of Vofs is written to the first node G, and the voltage value of Vdd is written to the second node S. At this time, Vini = Vdd-Vofs.

[0178] 2. In the second stage H2 (self-discharge threshold voltage reading stage), as shown in FIG29 , a high-level second control signal is input to the second control signal line DS, a high-level gate drive signal is input to the gate line WS, and a high-level first control signal is input to the first control signal line AZ;

[0179] The transistor connected to the second control signal line DS receives a high-level second control signal, the transistor connected to the gate line WS receives a high-level gate drive signal, and the transistor connected to the first control signal line AZ receives a low-level first control signal; the first transistor T1 and the second transistor T2 are turned off, and the third transistor T3 is turned on; because the first node G is floating, under the action of the first capacitor C1, the voltage of the first node G changes with the voltage of the second node S, so that the voltage difference between the first node G and the second node S remains unchanged from the previous stage, that is, Vgs=Vini=Vdd-Vofs;

[0180] Under the effect of the back gate, |V TH-EF |=a*(Vdd-Vs)+|V TH |, a is the coefficient of the back gate effect, Vs is the voltage of the second node S, as the voltage Vs of the second node S decreases, since Vgs remains unchanged at Vini, |V TH-EFWhen Vini is reached, the discharge stops and the driving transistor DMOS is cut off. At this time:

[0181] a*(Vdd-Vs)+|V TH |=Vini=Vdd-Vofs;

[0182] Then Vs=Vdd+(|V TH |-Vini) / a;

[0183] Vg=Vdd-Vini+(|V TH |-Vini) / a.

[0184] 3. In the third stage H3 (Vdata writing and threshold compensation stage), as shown in FIG29 , a high-level second control signal is input to the second control signal line DS, a low-level gate drive signal is input to the gate line WS, and a high-level first control signal is input to the first control signal line AZ;

[0185] The transistor connected to the second control signal line DS receives a high-level second control signal, the transistor connected to the gate line WS receives a low-level gate drive signal, and the transistor connected to the first control signal line AZ receives a low-level first control signal. The first transistor T1 and the third transistor T3 are turned on, and the second transistor T2 is turned off. At this time, the Vdata signal is written to the first node G, and the voltage of the first node G changes from Vofs to Vdata. Since the second node S is floating, the voltage of the second node S changes by ΔVs.

[0186] ΔVs = (1-b) * Vg, where b = C2 / (C1 + C2);

[0187] ΔVg=Vdata-Vdd+Vini-(|V TH |-Vini) / a

[0188] =Vdata-Vdd+Vini+(Vini-|V TH |) / a;

[0189] Then, ΔVs=(1-b)*[Vdata-Vdd+Vini+(Vini-|V TH |) / a];

[0190] At this time, the voltage of the second node S is:

[0191] Vdd-(Vini-|V TH |) / a+ΔVs

[0192] =Vdd-(Vini-|V TH|) / a+(1-b)*[Vdata-Vdd+Vini+(Vini-|V TH |) / a]

[0193] =Vdata+Vini-bVdata+bVdd*b(Vini-|V TH |) / a-bVini;

[0194] Then |Vgs|=(1-b / ab)*Vini+b|V TH | / a+b(Vdd-Vdata).

[0195] 4. In the fourth stage H4 (light-emitting stage), as shown in FIG29 , a low-level second control signal is input to the second control signal line DS, a high-level gate drive signal is input to the gate line WS, and a low-level first control signal is input to the first control signal line AZ;

[0196] The transistor connected to the second control signal line DS receives a low-level second control signal, the transistor connected to the gate line WS receives a high-level gate drive signal, and the transistor connected to the first control signal line AZ receives a high-level first control signal. The first transistor T1 and the third transistor T3 are turned off, the second transistor T2 is turned on, and the driving transistor DMOS is turned on.

[0197] During the light-emitting phase of the light-emitting device CC6, the current in the light-emitting path between the second node S and the anode is:

[0198] It can be seen from the above formula that the current in the light emitting path between the second node S and the anode is proportional to the threshold voltage V of the driving transistor DMOS. TH Not relevant.

[0199] Figures 14 and 15 illustrate schematic structural diagrams of two driving substrates, wherein the driving substrate 1 includes a substrate 1 and a pixel driving circuit, the pixel driving circuit includes at least a driving transistor DTFT and a switching transistor STFT (for example, the pixel driving circuit shown in Figure 28), and the driving substrate 1 includes a first insulating layer I1 and a third insulating layer I3, wherein a plurality of columnar connecting electrodes 7 pass through the first insulating layer I1 to electrically connect the pixel driving circuit and the anode AN (first electrode 2) of the sub-pixel together; in addition, in Figure 15, the driving substrate 1 also includes a reflective layer RE and a second insulating layer I2, wherein the plurality of columnar connecting electrodes 7 are electrically connected to the pixel driving circuit through the reflective layer RE.

[0200] In an exemplary embodiment, the reflective layer RE has conductivity.

[0201] In an exemplary embodiment, the reflective layer RE includes an aluminum metal layer and a protective layer, wherein the protective layer is located between the aluminum metal layer and the substrate 100, and both the aluminum metal layer and the protective layer are conductive. The aluminum metal layer has a good reflective effect, thereby being able to reflect the light emitted from the light-emitting functional layer toward the reflective layer RE, thereby improving the light output rate of the display panel, improving the utilization efficiency of the light emitted by the light-emitting functional layer 4, improving the display effect, and reducing power consumption.

[0202] When the raised portion 22 is used as the spacer 6, the columnar connecting electrode 7 can be set below the raised portion 22, and the end of the columnar connecting electrode 7 away from the substrate is embedded in the first electrode 2 (that is, the columnar connecting electrode 7 is designed to protrude from the driving substrate 1). In this way, when the first electrode 2 is formed, the raised portion 22 can be formed under the support of the lower columnar connecting electrode 7, so that the raised portion 22 serves as the spacer 6 to form at least two first grooves C1 in the same pixel opening K.

[0203] In some embodiments, a spacer 6 may be provided in the pixel opening K of the same sub-pixel, and in this case, a columnar connecting electrode 7 is provided in the region of the driving substrate 1 corresponding to the sub-pixel; in some embodiments, as shown in FIG12 , two spacers 6 may be provided in the pixel opening K of the same sub-pixel, and in this case, two columnar connecting electrodes 7 are provided in the region of the driving substrate 1 corresponding to the sub-pixel; in some embodiments, as shown in FIG13 , three spacers 6 may be provided in the pixel opening K of the same sub-pixel, and in this case, three columnar connecting electrodes 7 are provided in the region of the driving substrate 1 corresponding to the sub-pixel.

[0204] In some embodiments, as shown in FIG. 12 and FIG. 13 , the dimension D1 of the portion of the columnar connecting electrode 7 embedded in the first electrode 2 perpendicular to the substrate plane is substantially equal to the dimension h1 ′ of the protrusion 22 perpendicular to the substrate plane.

[0205] It should be noted that, as shown in FIG5 or FIG6, when the spacer 6 and the pixel definition layer 3 are provided in the same layer, and when the drive substrate 1 is a silicon-based drive substrate, in conjunction with FIG8 and FIG9, the orthographic projection of the columnar connection electrode 7 on the substrate of the drive substrate 1 can be arranged to be located within the orthographic projection of the spacer 6 on the substrate. Alternatively, the orthographic projection of the columnar connection electrode 7 on the substrate of the drive substrate 1 and the orthographic projection of the spacer 6 on the substrate can be arranged to not overlap. Of course, in this case, the upper surface of the columnar connection electrode 7 is almost flush with the upper surface of the drive substrate 1, and the columnar connection electrode 7 cannot be embedded in the first electrode 2.

[0206] In the display panel provided in at least one embodiment of the present application, as shown in Figures 30 to 32 , at least one break DK is provided on the spacer 6 , and the light-emitting functional layers 4 in two adjacent first grooves C1 are connected at the location of the break DK. Figure 5 is a schematic cross-sectional view of the structure of Figure 30 along the M1M2 direction.

[0207] In the display panel provided by at least one embodiment of the present application, the orthographic projection pattern of the spacer 6 on the driving substrate 1 includes a ring shape or a grid shape.

[0208] Exemplarily, as shown in FIG31 , the orthographic projection pattern of the spacer 6 on the driving substrate 1 includes a grid shape, wherein a plurality of breaks K are provided on the spacer 6 shown in FIG31 , and a break K is provided on the spacer 6 between any two adjacent first grooves C1 in the same sub-pixel, thereby connecting the light-emitting functional layers 4 in all the first grooves C1 in the pixel opening K of the same sub-pixel together.

[0209] For example, as shown in Figures 30 and 32, the orthographic projection of the spacer 6 on the drive substrate 1 includes a ring, and a break K is provided between two adjacent first grooves C1; thereby connecting the light-emitting functional layers 4 in the two first grooves C1 in the pixel opening K of the same sub-pixel. The specific shape of the ring is not limited here. For example, the ring may include an elliptical ring, a circular ring, or a polygonal ring (a five-membered ring, a six-membered ring, etc.). For example, the outer contour of the ring may be substantially the same as the outer contour of the sub-pixel.

[0210] Exemplarily, as shown in FIG33 , the orthographic projection pattern of the spacer 6 on the driving substrate 1 includes a grid-shaped ring, and a plurality of breaks K are set between two adjacent first grooves C1; thereby connecting the light-emitting functional layers 4 in the two first grooves C1 in the pixel opening K of the same sub-pixel together.

[0211] By setting the light-emitting functional layers 4 in two adjacent first grooves C1 to be connected at the position of the fracture DK, when the light-emitting functional layer 4 of the display panel is prepared by the inkjet printing process, it is beneficial to the leveling of the light-emitting functional layer 4 material and improves the thickness uniformity of the light-emitting functional layer 4 in the same sub-pixel; in addition, when the light-emitting functional layer 4 of the display panel is prepared by the inkjet printing or evaporation process, it is beneficial to the uniform distribution of the electrical properties of the light-emitting functional layer 4 in the same sub-pixel, thereby improving the brightness uniformity and luminous efficiency.

[0212] In the display panel provided in at least one embodiment of the present application, the depth of the fracture DK in a direction perpendicular to the plane of the drive substrate 1 is less than or equal to the height of the spacer 6 in a direction perpendicular to the plane of the drive substrate 1 .

[0213] For example, the depth of the fracture DK may be smaller than the height of the spacer 6 . In this case, part of the material of the spacer 6 remains at the bottom of the fracture DK.

[0214] Exemplarily, the depth of the break DK may be equal to the height of the spacer 6 . In this case, the bottom of the break DK is the upper surface of the first electrode 2 , for example, the contact portion 21 of the first electrode 2 .

[0215] In the display panel provided by at least one embodiment of the present application, as shown in FIG32 , the area enclosed by the orthographic projection of the outer contour of at least one fracture DK on the substrate overlaps with the orthographic projection of the columnar connecting electrode 7 on the substrate.

[0216] Exemplarily, the orthographic projection of each columnar connecting electrode 7 on the substrate overlaps with the area enclosed by the orthographic projections of the outer contours of different fractures DK on the substrate.

[0217] For example, when the orthographic projection area of ​​the columnar connecting electrode 7 on the substrate is smaller than the area of ​​the region enclosed by the orthographic projection of the outer contour of the fracture DK on the substrate, the orthographic projection of the columnar connecting electrode 7 on the substrate can be set to fall in the central area of ​​the region enclosed by the orthographic projection of the outer contour of the fracture DK on the substrate.

[0218] In an embodiment of the present application, by setting the area enclosed by the orthographic projection of the outer contour of at least one break DK on the substrate to overlap with the orthographic projection of the columnar connection electrode 7 on the substrate, the negative impact of the columnar connection electrode 7 on the display effect in a local area can be adjusted by adjusting the depth of the port K (i.e., the thickness of the spacer 6 remaining at the bottom of the break DK), thereby improving the display effect. In the display panel provided by at least one embodiment of the present application, as shown in Figure 33, multiple breaks DK are symmetrically distributed around the center of the sub-pixel.

[0219] In an embodiment of the present application, the light-emitting functional layers 4 in two adjacent first grooves C1 are connected at the position of the fracture DK, and the multiple fractures DK are symmetrically distributed around the center of the sub-pixel; when the inkjet printing process is adopted to prepare the light-emitting functional layer 4 of the display panel, it is more conducive to the leveling of the light-emitting functional layer 4 material, and further improves the thickness uniformity of the light-emitting functional layer 4 in the same sub-pixel; in addition, when the inkjet printing or evaporation process is adopted to prepare the light-emitting functional layer 4 of the display panel, it is also conducive to the uniform distribution of the electrical properties of the light-emitting functional layer 4 in the same sub-pixel, thereby further improving the brightness uniformity and luminous efficiency.

[0220] In the display panel provided in at least one embodiment of the present application, the light-emitting functional layer 4 includes a plurality of light-emitting functional sublayers arranged in sequence along a direction away from the driving substrate 1, and the curvature of the surface of the plurality of light-emitting functional sublayers away from the driving substrate 1 gradually decreases along the direction away from the first electrode 2.

[0221] It should be noted that in the embodiments of the present application, curvature refers to the average curvature, which will not be described in detail below.

[0222] In an exemplary embodiment, the multiple light-emitting functional sublayers may include at least one light-emitting sublayer, a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL); when the light-emitting functional layer 4 includes two or more light-emitting sublayers, the multiple light-emitting functional sublayers may further include a charge transport layer (CGL).

[0223] For example, the material of the light-emitting sublayer can be selected from pyrene derivatives, anthracene derivatives, fluorene derivatives, perylene derivatives, styrylamine derivatives, metal complexes, and the like.

[0224] Exemplarily, the material of the hole injection layer may include oxides, such as molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, and manganese oxide.

[0225] For example, the material of the hole injection layer may also include organic materials, such as hexacyanohexaazatriphenylene, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), and 1,2,3-tris[(cyano)(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cyclopropane.

[0226] Exemplary materials of the hole transport layer may include aromatic amines and dimethylfluorene or carbazole materials having hole transport properties, such as: 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB), N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (TPD), 4-phenyl-4'-(9-phenylfluorene-9-yl)triphenylamine (BAFLP), 4,4'-bis[N-(9,9-dimethylfluorene-2-yl)-N-phenylamino]biphenyl (DFLDPBi), 4,4'-di(9-carbazolyl)biphenyl (CBP), 9-phenyl-3-[4-(10-phenyl-9-anthracenyl)phenyl]-9H-carbazole (PCzPA).

[0227] For example, the material of the electron transport layer may include aromatic heterocyclic compounds, such as benzimidazole derivatives, imidazole derivatives, pyrimidine derivatives, oxazine derivatives, quinoline derivatives, isoquinoline derivatives, phenanthroline derivatives, and the like.

[0228] For example, the material of the electron injection layer may be an alkali metal or a metal and a compound thereof, such as lithium fluoride (LiF), ytterbium (Yb), magnesium (Mg), and calcium (Ca).

[0229] In the display panel provided in at least one embodiment of the present application, as shown in Figures 2 to 6, Figures 10 to 11, Figures 16A to 19, and Figures 21 to 23, the sub-pixel includes a second electrode 5, the second electrode 5 covers the light-emitting functional layer 4, the average curvature of the second electrode 5 is smaller than the average curvature of the light-emitting functional layer 4, and the refractive index of the second electrode 5 is smaller than the refractive index of the light-emitting functional layer 4.

[0230] In some examples, the second electrode 5 can be made of any one or more of magnesium (Mg), silver (Ag), and aluminum (Al), or an alloy made of any one or more of the above metals, or a transparent conductive material. Multiple sub-pixels can share the second electrode 5.

[0231] In an exemplary embodiment, the refractive index of the light-emitting functional layer 4 is in the range of 1.7 to 1.9, and the refractive index of the second electrode 5 is less than 1.7.

[0232] For example, the refractive index of the light-emitting functional layer 4 may be 1.8, 1.85 or 1.9; and the refractive index of the second electrode 5 may be 1.65, 1.52, 1.48 or 1.4.

[0233] In the embodiment of the present application, by setting the refractive index of the second electrode 5 to be smaller than the refractive index of the light-emitting functional layer 4, the refraction angle of the light becomes smaller and converges in the process of light being emitted from the light-emitting functional layer 4 through the second electrode 5, thereby playing a focusing role, improving the light extraction efficiency, and thus improving the brightness.

[0234] In the display panel provided by at least one embodiment of the present application, as shown by the dotted line marked on the light-emitting functional layer 4 in FIG2 , within the first groove C1, a portion of the surface of the light-emitting functional layer 4 on the side away from the driving substrate 1 (i.e., the first curved surface HM1) is parallel to the surface of the first electrode 2 on the side away from the driving substrate 1;

[0235] The ratio of the area of ​​the portion of the surface of the light-emitting functional layer 4 on the side away from the driving substrate 1 (i.e., the first curved surface HM1) and the portion parallel to the surface of the first electrode 2 on the side away from the driving substrate 1 (i.e., the area of ​​the area marked with a dotted line on the light-emitting functional layer 4 in FIG2 ) to the area of ​​the surface of the light-emitting functional layer 2 on the side away from the driving substrate 1 is less than or equal to 20%.

[0236] In an exemplary embodiment, the portion of the surface of the light-emitting functional layer 4 that is away from the drive substrate 1 and parallel to the surface of the first electrode 2 that is away from the drive substrate 1 can be disposed in the middle region of the first groove C1, and the remaining surface of the light-emitting functional layer 4 within the first groove C1 can be disposed in the edge region. In this way, the distance from the light-emitting functional layer 4 in the middle region to the second electrode 2 along a direction perpendicular to the plane of the drive substrate 1 is uniform, that is, the distance from the portion of the first curved surface HM1 located in the middle region to the second electrode 2 along a direction perpendicular to the plane of the drive substrate 1 is uniform. In this case, the surface of the first electrode 2 that is away from the drive substrate 1 is used as an example for description.

[0237] Of course, for the light-emitting functional layer 4 in the middle area, the distance between it and the driving substrate 1 in the direction perpendicular to the plane where the driving substrate 1 is located is equal, that is, the distance between the part of the first curved surface HM1 located in the middle area and the driving substrate 1 in the direction perpendicular to the plane where the driving substrate 1 is located is equal.

[0238] In some embodiments, for the light-emitting functional layer 4 in the edge region, the distance between the light-emitting functional layer 4 and the second electrode 2 gradually decreases along a direction perpendicular to the plane of the drive substrate 1 in the direction from the middle region to the edge region. In this case, the surface of the first electrode 2 away from the drive substrate 1 is used as an example for description.

[0239] Of course, for the light-emitting functional layer 4 in the edge region, the distance from the light-emitting functional layer 4 to the driving substrate 1 along the direction perpendicular to the plane where the driving substrate 1 is located gradually decreases in the direction from the middle region to the edge region.

[0240] When the surface of the first electrode 2 away from the driving substrate 1 is a curved surface, the distance relationship between the first curved surface HM1 and the first electrode may not necessarily satisfy the above condition.

[0241] In the display panel provided in at least one embodiment of the present application, as shown in Figure 3 or Figure 4, the ratio of the dimension d1 of the pixel opening K along the direction parallel to the plane where the driving substrate 1 is located to the distance d3 between two adjacent first electrodes 2 along the same direction is in the range of 0.7 to 1.4, that is, the range of d1 / d3 is 0.7 to 1.4.

[0242] In exemplary embodiments, d1 / d3 may be in the range of 0.8, 0.9, 1.0, 1.1, 1.2, or 1.3.

[0243] Exemplarily, a dimension d1 of the pixel opening K in a direction parallel to the plane where the driving substrate 1 is located is substantially equal to a distance d3 between two adjacent first electrodes 2 in the same direction.

[0244] In the display panel provided in the embodiment of the present application, by setting the ratio of the dimension d1 of the pixel opening K along the direction parallel to the plane where the driving substrate 1 is located to the distance d3 between two adjacent first electrodes 2 along the same direction to be in the range of 0.7 to 1.4, that is, the range of d1 / d3 is 0.7 to 1.4, the size of the pixel opening K can be increased as much as possible (that is, the aperture ratio can be increased), and the distance between two adjacent first electrodes 2 can be reduced (that is, the distance between two adjacent sub-pixels can be reduced) under the current display panel preparation process, thereby increasing the brightness of the display panel as much as possible and improving the resolution of the display panel, which is conducive to the preparation of high-resolution display products.

[0245] In the display panel provided in at least one embodiment of the present application, as shown in Figures 4, 6 and 7, the surface of the first electrode 2 away from the driving substrate 1 includes a second curved surface HM2, the orthographic projection of the first curved surface HM1 on the substrate of the driving substrate 1 is located within the orthographic projection of the second curved surface HM2 on the substrate, and the first curved surface HM1 and the second curved surface HM2 are oriented in opposite directions.

[0246] In an exemplary embodiment, when the surface of the first electrode 2 away from the driving substrate 1 includes a second curved surface HM2, and the first curved surface HM1 and the second curved surface HM2 are oriented in opposite directions, in each first groove C1, the distance from the portion of the first curved surface HM1 located in the middle area to the second curved surface HM2 along the direction perpendicular to the plane where the driving substrate 1 is located is greater than the distance from the portion of the first curved surface HM1 located in the edge area to the second curved surface HM2 along the direction perpendicular to the plane where the driving substrate 1 is located, and compared with the case where the surface of the first electrode 2 away from the driving substrate 1 is a plane, the distance from the portion of the first curved surface HM1 located in the middle area to the second curved surface HM2 along the direction perpendicular to the plane where the driving substrate 1 is located is greater.

[0247] Furthermore, when the surface of the first electrode 2 facing away from the drive substrate 1 includes a second curved surface HM2, and the first curved surface HM1 and the second curved surface HM2 face opposite directions, the microcavity effect of each sub-pixel can be significantly enhanced, significantly improving the brightness of the sub-pixel. The effective cavity length of the microcavity effect is primarily determined by the distance between the first electrode 2 and the second electrode 5 and the effective refractive index N between the first electrode 2 and the second electrode 5. Given a specific material, the effective cavity length of the microcavity effect is primarily determined by the distance d between the first electrode 2 and the second electrode 5.

[0248] It should be noted that when the surface of the first electrode 2 away from the driving substrate 1 includes the second curved surface HM2, and the first curved surface HM1 and the second curved surface HM2 are oriented in opposite directions, compared with the case where the surface of the first electrode 2 away from the driving substrate 1 is a plane, the distance between the first electrode 2 and the second electrode 5 is significantly increased.

[0249] In the display panel provided in at least one embodiment of the present application, as shown in FIG4 , FIG6 and FIG7 , the second curved surface HM2 serves as the bottom of the pixel opening K;

[0250] Taking the structure shown in FIG4 as an example, the area S2 of the region enclosed by the orthographic projection of the outer contour of the second curved surface HM2 on the driving substrate 1 is larger than the area S1 of the region enclosed by the orthographic projection of the outer contour of the edge of the pixel opening K on the driving substrate 1. As shown in FIG7 , an undercut structure 8 (Undercut) is provided on the sidewall of the pixel opening K at a position close to the second curved surface HM2.

[0251] In an embodiment of the present application, an undercut structure 8 (Undercut) is provided on the side wall of the pixel opening K of each sub-pixel at a position close to the second curved surface HM2. During the preparation of the light-emitting functional layer 4, the undercut structure 8 can effectively disconnect the light-emitting functional layers 4 of two adjacent sub-pixels, thereby effectively isolating the two adjacent sub-pixels and avoiding light crosstalk between the two adjacent sub-pixels.

[0252] In some embodiments, as shown in Figures 4, 6, and 7, the area S2 of the region enclosed by the orthographic projection of the outer contour of the second curved surface HM2 on the driving substrate 1 is larger than the area S1 of the region enclosed by the orthographic projection of the outer contour of the edge of the first groove C1 on the driving substrate 1. At least a portion of the sidewalls of the first groove C1 are provided with an undercut structure 8 (undercut) at a position close to the second curved surface HM2. In this way, the light-emitting functional layers 4 in two adjacent first grooves C1 within the same pixel opening K can be disconnected, thereby preventing the light-emitting functional layers 4 in the two adjacent first grooves C1 from being connected together and destroying the convex lens-like structure of the first curved surface HM1 in the first groove C1, thereby improving the yield of forming the first curved surface HM1 and improving the focusing effect of the light-emitting functional layer 4 in the first groove C1. There is no need to additionally provide a microlens array structure on the light-emitting side of the sub-pixel light-emitting functional layer, thereby saving process steps and avoiding damage to the light-emitting functional layer during the thermal reflow process of the microlens process in the related art. At the same time, it can also greatly improve the light extraction efficiency of the display panel, further improve the brightness of the display panel, and thus improve the display effect.

[0253] In the display panel provided by at least one embodiment of the present application, as shown in FIG. 4 , FIG. 6 and FIG. 7 , the curvature of the second curved surface HM2 is smaller than the curvature of the first curved surface HM1 .

[0254] In the embodiment of the present application, by setting the curvature of the second curved surface HM2 to be smaller than the curvature of the first curved surface HM1, while improving the microcavity effect, it is avoided that the curvature of the second curved surface HM2 is too large, which would cause the undercut structure 8 (undercut) on the sidewall of the first groove C1 (or the sidewall of the pixel opening K) to be too large, thereby avoiding the undesirable problems such as the collapse of the spacer 6 or the pixel definition layer 3 caused by the undercut structure 8 being too large.

[0255] In the display panel provided in at least one embodiment of the present application, as shown in Figures 16A, 16B, 17 and 18, the pixel definition layer 3 includes a pixel opening K and a pixel recess ZD located between two adjacent pixel openings K; the pixel recess ZD is provided with a second groove C2, and the area enclosed by the orthographic projection of the outer contour of the second groove C2 on the driving substrate 1 falls within the area enclosed by the orthographic projection of the outer contour of the gap between the two adjacent first electrodes 2 on the driving substrate 1.

[0256] It should be noted that the above-mentioned “two adjacent pixel openings” means that no other pixel opening is provided between the two pixel openings K.

[0257] In the display panel provided in the embodiments of the application, by providing a second groove C2 between adjacent sub-pixels, it is possible to disconnect (not contact) part of the light-emitting functional sub-layers 4 of the adjacent sub-pixels at the location of the second groove C2, thereby preventing light crosstalk between the two adjacent sub-pixels. The light-emitting functional sub-layer disconnected at the location of the second groove C2 includes at least one of the other film layers in the light-emitting functional sub-layer except the common layer. The common layer of all sub-pixels in the display panel can be shared, that is, the common layer of any two adjacent sub-pixels is connected as a whole.

[0258] In some embodiments, for a display panel structure in which the light-emitting functional layer 4 includes at least two light-emitting sublayers, the second groove C2 can disconnect the charge generation layer in the light-emitting functional layer 4 of adjacent sub-pixels at the location of the second groove C2, thereby preventing crosstalk between adjacent sub-pixels caused by the charge generation layer having a higher conductivity. In addition, because the display panel can avoid crosstalk between adjacent sub-pixels through the second groove C2, the display panel can improve pixel density while adopting a double-layer light-emitting (Tandem EL) design. Therefore, the display panel can have advantages such as long life, low power consumption, high brightness, and high resolution.

[0259] The charge generation layer may include an n-type doped layer for generating holes and a p-type doped layer for generating electrons, which are stacked.

[0260] For example, the charge generation layer may include an n-type doped organic layer / p-type doped organic layer, such as BPhen:Cs / NPB:F4-TCNQ, Alq3:Li / NPB:FeCl3, TPBi:Li / NPB:FeCl3, and Alq3:Mg / m-MTDATA:F4-TCNQ. Of course, the embodiments of the present application include but are not limited to the above, and the material of the charge generation layer may also include an n-type doped organic layer / inorganic metal oxide, such as Alq3:Mg / WO3, BPhen:Li / MoO3, BCP:Li / V2O5, and BCP:Cs / V2O5; or, an n-type doped organic layer / organic layer, such as Alq3:Li / HAT-CN; or, a non-doped material, such as F 16 CuPc / CuPc and Al / WO3 / Au.

[0261] In the embodiment of the present application, when the light-emitting functional layer 4 is prepared by inkjet printing, when the printing ink is offset, the printing ink flows into the second groove C2, so that the color mixing of the printing ink in two adjacent sub-pixels can be avoided.

[0262] In the display panel provided by at least one embodiment of the present application, as shown in FIG16A, FIG16B, FIG17 and FIG18, the ratio between the maximum dimension d2 of the second groove C2 in a direction parallel to the plane where the drive substrate 1 is located and the depth h2 of the second groove C2 in a direction perpendicular to the plane where the drive substrate 1 is located is smaller than the ratio between the maximum dimension d1 of the first groove C1 in a direction parallel to the plane where the drive substrate 1 is located and the depth h1 of the first groove C1 in a direction perpendicular to the plane where the drive substrate 1 is located, that is, d2 / h2 <d1 / h1。

[0263] In some embodiments, since the light-emitting functional layer 4 within the first groove C1 is located in the pixel opening area, i.e., the area actually used for light emission in the display panel, and the second groove C2 is mainly used to separate two adjacent sub-pixels, the actual size (including width and / or depth) of the second groove C2 can be set to be smaller than the actual size of the first groove C1. In actual applications, for ease of manufacturing, the depths of the two grooves can be set to be the same, and the size relationship between d2 / h2 and d1 / h1 can be adjusted by adjusting their widths.

[0264] In some embodiments, the ratio of the maximum dimension d2 of the second groove C2 along the direction parallel to the plane where the drive substrate 1 is located to the depth h2 of the second groove C2 along the direction perpendicular to the plane where the drive substrate 1 is located can be set to be equal to the ratio of the maximum dimension d1 of the first groove C1 along the direction parallel to the plane where the drive substrate 1 is located to the depth h1 of the first groove C1 along the direction perpendicular to the plane where the drive substrate 1 is located, that is, d2 / h2=d1 / h1.

[0265] In the embodiment of the present application, by setting d2 / h2≤d1 / h1, the aspect ratio of the second groove C2 is greater than the aspect ratio of the first groove C1, which is more conducive to the curvature of the light-emitting functional layer 4 prepared in the second groove C2 in the subsequent process being greater than the curvature of the light-emitting functional layer 4 in the first groove C1, thereby improving the light convergence effect of the light-emitting functional layer 4 in the first groove C1 in the pixel opening K, and can further improve the convergence effect of the light-emitting functional layer 4 in the second groove C2 on the crosstalk light (see the description below for details), improve the light crosstalk problem, improve the brightness of the display panel, and improve the display effect of the display panel.

[0266] In the display panel provided by at least one embodiment of the present application, as shown in FIG. 16A , FIG. 16B , FIG. 17 and FIG. 18 , the second groove C2 divides the same pixel recess ZD into two parts (including ZD1 and ZD2 );

[0267] In the same direction parallel to the plane of the drive substrate 1, the ratio between the dimension of a portion of the pixel recess (d4 or d4') and the dimension d2 of the second groove C2 is in the range of 0.7 to 1.4. That is, the ratio d4 / d2 is in the range of 0.7 to 1.4, or the ratio d4' / d2 is in the range of 0.7 to 1.4.

[0268] Exemplarily, the pixel recess ZD includes a first pixel recess ZD1 and a second pixel recess ZD2 , wherein a ratio between a size d4 of the first pixel recess ZD1 and a size d2 of the second groove C2 ranges from 0.7 to 1.4.

[0269] Exemplarily, the pixel recess ZD includes a first pixel recess ZD1 and a second pixel recess ZD2 , wherein a ratio between a size d4 ′ of the second pixel recess ZD1 and a size d2 of the second groove C2 is in a range of 0.7 to 1.4.

[0270] For example, in the same direction parallel to the plane of the driving substrate 1 , the ratio between the size (d4 or d4') of a portion of the pixel recess and the size d2 of the second groove C2 can be 0.8, 0.9, 1.0, 1.1, 1.2 or 1.3.

[0271] In the display panel provided in at least one embodiment of the present application, as shown in Figures 16A, 16B, 17 and 18, the absolute value of the difference between the ratio of the dimension (d4 or d4') of a portion of the pixel recess ZD along a direction parallel to the plane where the drive substrate 1 is located and the dimension d2 of the second groove C2 along the same direction (i.e., d4 / d2 or d4' / d2), and the ratio of the dimension d1 of the pixel opening K along a direction parallel to the plane where the drive substrate 1 is located and the distance d3 between two adjacent first electrodes 2 along the same direction (i.e., d1 / d3) is less than or equal to 0.1.

[0272] That is, |d4 / d2-d1 / d3|≤0.1, or, |d4' / d2-d1 / d3|≤0.1.

[0273] Illustratively, |d4 / d2-d1 / d3| may be equal to 0.03, 0.05, 0.08, or 0.09.

[0274] Illustratively, |d4′ / d2−d1 / d3| may be equal to 0.03, 0.05, 0.08, or 0.09.

[0275] In an embodiment of the present application, by setting |d4 / d2-d1 / d3|≤0.1, or |d4' / d2-d1 / d3|≤0.1, the preparation process accuracy and dimensional accuracy of the second electrode 2 in two adjacent sub-pixels can be improved, and the preparation process accuracy and dimensional accuracy of the pixel opening K and the recessed portion ZD in the pixel definition layer 3 can be improved, thereby improving the utilization of space and facilitating the preparation of a high-precision and high-resolution (PPI) display panel.

[0276] In the display panel provided by at least one embodiment of the present application, as shown in Figures 16A, 16B, 17 and 18, in the same direction parallel to the plane where the driving substrate 1 is located, the absolute value of the size difference (d3-d3') between two adjacent gaps (the gap between the two first electrodes 2) is smaller than the absolute value of the size difference (d4-d4') between the two parts (ZD1 and ZD2) on the same pixel recess ZD, that is, |d3-d3'|<|d4-d4'|.

[0277] In an embodiment of the present application, by setting |d3-d3'|<|d4-d4'|, the preparation process accuracy and dimensional accuracy of the second electrode 2 in two adjacent sub-pixels are greater than the preparation process accuracy and dimensional accuracy of the pixel opening K and the recessed portion ZD in the pixel definition layer 3.

[0278] In the display panel provided in at least one embodiment of the present application, the plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, and the first sub-pixel, the second sub-pixel, and the third sub-pixel display different colors;

[0279] Exemplarily, one of the first sub-pixel, the second sub-pixel, and the third sub-pixel is a red sub-pixel, another is a green sub-pixel, and the remaining one is a blue sub-pixel.

[0280] In a direction parallel to the plane of the driving substrate 1, the absolute value of the size difference (d3-d3') between the gap between the first sub-pixel and the second sub-pixel (the gap between the two first electrodes 2 of the first sub-pixel and the second sub-pixel) and the gap between the second sub-pixel and the third sub-pixel (the gap between the two first electrodes 2 of the second sub-pixel and the third sub-pixel) is smaller than the absolute value of the size difference (d2) between the second groove C2 between the first sub-pixel and the second sub-pixel and the size (d2') between the second groove C2 between the second sub-pixel and the third sub-pixel; that is, |d3-d3'|<|d2-d2'|.

[0281] The absolute value of the size difference (d3-d3') between the gap between the second subpixel and the third subpixel (the gap between the two first electrodes 2 of the second subpixel and the third subpixel) and the gap between the third subpixel and the first subpixel (the gap between the two first electrodes 2 of the third subpixel and the first subpixel) is smaller than the absolute value of the size difference (d2) between the size of the second groove C2 between the second subpixel and the third subpixel and the size (d2') of the second groove C2 between the third subpixel and the first subpixel, that is, |d3-d3'|<|d2-d2'|.

[0282] In an embodiment of the present application, by setting |d3-d3'|<|d2-d2'|, the preparation process accuracy and dimensional accuracy of the second electrode 2 in two adjacent sub-pixels are greater than the preparation process accuracy and dimensional accuracy of the pixel opening K and the recessed portion ZD in the pixel definition layer 3.

[0283] In the display panel provided by at least one embodiment of the present application, in a direction parallel to the plane on which the drive substrate 1 is located, an absolute value of a size difference (d3-d3') between a gap between a first subpixel and a second subpixel (a gap between the two first electrodes 2 of the first subpixel and the second subpixel) and a gap between the second subpixel and the third subpixel (a gap between the two first electrodes 2 of the second subpixel and the third subpixel) is smaller than an absolute value of a size difference (d8-d8') between a size d8 of a pixel recess ZD between the first subpixel and the second pixel and a size d8' of the pixel recess ZD between the second subpixel and the third subpixel, that is, |d3-d3'|<|d8-d8'|;

[0284] In a direction parallel to the plane of the drive substrate 1, the absolute value of the size difference (d3-d3') between the gap between the second sub-pixel and the third sub-pixel (the gap between the two first electrodes 2 of the second sub-pixel and the third sub-pixel) and the gap between the third sub-pixel and the first sub-pixel (the gap between the two first electrodes 2 of the third sub-pixel and the first sub-pixel) is smaller than the absolute value of the size difference (d8-d8') between the size d8 of the pixel recess ZD between the second sub-pixel and the third sub-pixel and the size d8' of the pixel recess ZD between the third sub-pixel and the first sub-pixel, that is, |d3-d3'|<|d8-d8'|.

[0285] In an embodiment of the present application, by setting |d3-d3'|<|d8-d8'|, the preparation process accuracy and dimensional accuracy of the second electrode 2 in two adjacent sub-pixels are greater than the preparation process accuracy and dimensional accuracy of the pixel opening K and the recessed portion ZD in the pixel definition layer 3.

[0286] In the display panel provided by at least one embodiment of the present application, as shown in Figures 16B to 18, a partial area of ​​the light-emitting functional layer 4 is arranged in the second groove C2 and on the surface of the pixel recess ZD away from the driving substrate 1, and the portion of the surface of the light-emitting functional layer 4 away from the driving substrate 1 located in the second groove C2 includes a third curved surface HM3; the curvature of the first curved surface HM1 is smaller than the curvature of the third curved surface HM3.

[0287] As shown in Figure 20, when the portion of the surface of the light-emitting functional layer 4 on the side away from the driving substrate 1 located in the second groove C2 includes a third curved surface HM3, since the third curved surface HM3 forms a convex lens-like structure, when the crosstalk light in two adjacent sub-pixels is emitted laterally and irradiates the light-emitting functional layer 4 in the second groove C2, the third curved surface HM3 can converge the crosstalk light and irradiate the shading area (such as the shading pattern introduced later, or the overlapping area formed between two adjacent color film patterns, see below for details), and the shading area can absorb the crosstalk light, thereby preventing the crosstalk light from being emitted from the display panel, thereby improving the display effect of the display panel.

[0288] Exemplarily, the central area of ​​the third curved surface HM3 points to the direction around the third curved surface HM3, and the distance between the third curved surface HM3 and the driving substrate 1 gradually decreases.

[0289] Of course, for the third curved surface HM3, a partial area thereof can be set to be parallel to the surface of the first electrode 2 on the side away from the driving substrate 1 (or a partial area thereof can be set to be parallel to the driving substrate 1), that is, a partial area in the third curved surface HM3 can also include a plane-like structure, so the third curved surface HM3 is called a convex lens-like structure, but not necessarily a convex lens structure in the strict sense.

[0290] In the display panel provided in at least one embodiment of the present application, as shown in Figures 2 to 6, Figures 10 to 11, Figures 16A to 19, and Figures 21 to 23, the curvature of the first curved surface HM1 is greater than the curvature of the portion of the light-emitting functional layer 4 that is arranged on the surface of the pixel recess ZD away from the driving substrate 1.

[0291] By setting the curvature of the first curved surface HM1 to be greater than the curvature of the portion of the light-emitting functional layer 4 arranged on the surface of the pixel recess ZD away from the driving substrate 1, the light-emitting surface of the light-emitting functional layer 4 in each first groove C1 in the pixel opening K can form a structure similar to a convex lens, and has a better light-converging effect. There is no need to additionally set a microlens array structure on the light-emitting side of the sub-pixel light-emitting functional layer, which saves process steps and avoids damage to the light-emitting functional layer caused by the thermal reflow process of the microlens process in the related technology. At the same time, it can also greatly improve the light-emitting efficiency of the display panel, increase the brightness of the display panel, and thus improve the display effect.

[0292] In an exemplary embodiment, as shown in FIG. 16B to FIG. 18 , the curvature of the third curved surface HM3 is greater than the curvature of the portion of the light emitting functional layer 4 disposed on the surface of the pixel recess ZD away from the driving substrate 1 .

[0293] In the display panel provided by at least one embodiment of the present application, the curvature of the light-emitting functional layer of at least one of the first sub-pixel and the second sub-pixel is greater than the curvature of the light-emitting functional layer of the third sub-pixel.

[0294] Exemplarily, the curvature of the light-emitting functional layer of the first sub-pixel is greater than the curvature of the light-emitting functional layer of the third sub-pixel.

[0295] Exemplarily, the curvature of the light-emitting functional layer of the second sub-pixel is greater than the curvature of the light-emitting functional layer of the third sub-pixel.

[0296] In the display panel provided in at least one embodiment of the present application, the area of ​​the light-emitting region of the first sub-pixel is smaller than the area of ​​the light-emitting region of the second sub-pixel, and the area of ​​the light-emitting region of the second sub-pixel is smaller than the area of ​​the light-emitting region of the third sub-pixel; the curvature of the light-emitting functional layer 4 of the first sub-pixel is greater than the curvature of the light-emitting functional layer 4 of the second sub-pixel, and the curvature of the light-emitting functional layer 4 of the second sub-pixel is greater than the curvature of the light-emitting functional layer 4 of the third sub-pixel.

[0297] That is, when the area of ​​the light-emitting region in the sub-pixel is smaller, the curvature of the light-emitting functional layer 4 in the pixel opening K of the sub-pixel is larger.

[0298] In an embodiment of the present application, by setting the curvature of the light-emitting functional layer 4 in the sub-pixel with a smaller area of ​​the light-emitting region to be larger, the brightness difference caused by the smaller area is compensated by the focusing effect of the first curved surface HM1 formed by the light-emitting functional layer 4, thereby further improving the brightness of each sub-pixel with different light-emitting areas and further improving the display effect of the display panel.

[0299] In a display panel provided in at least one embodiment of the present application, as shown in FIG19 to FIG23 , a sub-pixel includes a second electrode 5, an encapsulation layer 9, and a color filter pattern 10. The second electrode 5 covers the light-emitting functional layer 4, the encapsulation layer 9 covers the second electrode 5, and the color filter pattern 10 is located on a side of the encapsulation layer 9 away from the second electrode 5.

[0300] As shown in FIG. 19 , a portion of the encapsulation layer 9 that overlaps with the orthographic projection of the first curved surface HM1 on the driving substrate 1 is provided with a fourth curved surface HM4 , and a curvature of the fourth curved surface HM4 is smaller than that of the first curved surface HM1 .

[0301] In an exemplary embodiment, the refractive index of the color filter pattern 10 is greater than the refractive index of the encapsulation layer 9 .

[0302] The material of the color filter pattern 10 includes an organic material, such as a resin; the material of the encapsulation layer 9 includes at least an inorganic material (only an inorganic material; or both an organic material and an inorganic material). Generally, the refractive index of the organic material is greater than the refractive index of the inorganic material. Taken together, the refractive index of the color filter pattern 10 is greater than the refractive index of the encapsulation layer 9.

[0303] In the embodiment of the present application, by providing a fourth curved surface HM4 on the encapsulation layer 9, the fourth curved surface HM4 further converges the light emitted by the sub-pixels, further improving the light extraction efficiency of the display panel, increasing the brightness of the display panel, and thus improving the display effect.

[0304] It should be noted that in the structures shown in Figures 19 to 23, 25 and 26, the color film pattern 10 (or marked as CF-R, CF-G, CF-B) is located on the side of the encapsulation layer 9 away from the second electrode 5; in other embodiments, as shown in Figure 27, the encapsulation layer 9 may include two encapsulation sublayers (TFE1 and TFE2), and the color film pattern 10 (CF) may be arranged between the two encapsulation sublayers. At this time, the above-mentioned fourth arc surface HM4 may be provided on both encapsulation sublayers.

[0305] In the display panel provided in at least one embodiment of the present application, as shown in Figures 19 to 23, the color filter pattern 10 is a lens structure, the lens structure covers the fourth curved surface HM4, and the orthographic projection of the color filter pattern 10 on the driving substrate 1 covers the orthographic projection of the first curved surface HM1 on the driving substrate 2.

[0306] Exemplarily, the colors of the multiple color filter patterns 10 are not completely the same. For example, the extensions of the multiple color filter patterns 10 can be set according to the display color of the sub-pixel, that is, set to the same color as the display color of the sub-pixel.

[0307] The color film pattern 10 is also called a color filter.

[0308] For example, the plurality of color filter patterns 10 may include a red color filter pattern, a green color filter pattern, and a blue color filter pattern.

[0309] In the display panel provided in at least one embodiment of the present application, as shown in Figure 23, a shading pattern (for example, a black matrix pattern BM) is arranged between the color filter patterns 10 of two adjacent sub-pixels, and a partial area of ​​the color filter pattern 10 is arranged on the side of the shading pattern away from the driving substrate 1; that is, the color filter patterns 10 on both sides of the shading pattern may have partial areas overlapping on the side of the shading pattern away from the driving substrate 1.

[0310] The area enclosed by the orthographic projection of the outer contour of the second groove C2 on the driving substrate 1 falls within the orthographic projection of the light shielding pattern BM on the driving substrate 1 .

[0311] When the area enclosed by the orthographic projection of the outer contour of the second groove C2 on the driving substrate 1 falls within the orthographic projection of the shading pattern BM on the driving substrate 1, the area enclosed by the orthographic projection of the third curved surface HM3 formed by the light-emitting functional layer 4 in the second groove C2 on the driving substrate 1 falls within the orthographic projection of the shading pattern BM on the driving substrate 1. In this way, after the third curved surface HM3 converges the crosstalk light, these crosstalk light can be irradiated onto the shading pattern BM, avoiding the crosstalk light from being emitted from the display panel, improving the light crosstalk problem, and improving the display effect of the display panel.

[0312] Exemplarily, as shown in FIG23 , in a direction parallel to the plane where the driving substrate 1 is located, the size d6 of the shading pattern BM is greater than or equal to the size d2 of the second groove C2, so that the third arc surface HM3 can illuminate the shading pattern BM after converging the crosstalk light, thereby allowing the shading pattern BM to absorb the crosstalk light as completely as possible.

[0313] In the display panel provided in at least one embodiment of the present application, as shown in Figures 19 to 21, there is an overlapping area JD between the color filter patterns 10 of two adjacent sub-pixels, and the area enclosed by the orthographic projection of the outer contour of the second groove C2 on the driving substrate 1 falls within the orthographic projection of the overlapping area JD on the driving substrate 1.

[0314] In an exemplary embodiment, the color filter patterns 10 of two adjacent sub-pixels have different colors. When the colors of the color filter patterns 10 of two adjacent sub-pixels are different, the overlapping area JD can play a role of light shielding.

[0315] When the area enclosed by the orthographic projection of the outer contour of the second groove C2 on the driving substrate 1 falls within the orthographic projection of the overlapping area JD on the driving substrate 1, the area enclosed by the orthographic projection of the third curved surface HM3 formed by the light-emitting functional layer 4 in the second groove C2 on the driving substrate 1 falls within the orthographic projection of the overlapping area JD on the driving substrate 1. In this way, after the third curved surface HM3 converges the crosstalk light, these crosstalk light can be irradiated onto the overlapping area JD, avoiding the crosstalk light from being emitted from the display panel, improving the light crosstalk problem, and improving the display effect of the display panel.

[0316] For example, as shown in FIG19 , in a direction parallel to the plane where the driving substrate 1 is located, the size d6 of the overlapping area JD is greater than or equal to the size d2 of the second groove C2, so that the third curved surface HM3 can converge the crosstalk light and illuminate the shading pattern BM, thereby allowing the shading pattern BM to absorb the crosstalk light as completely as possible.

[0317] In the display panel provided in at least one embodiment of the present application, as shown in Figures 19 and 21 to 23, the height h3 of the color filter pattern 10 along the plane perpendicular to the driving substrate 1 is greater than the width d5 ​​of the color filter pattern 10 along the plane parallel to the driving substrate 1.

[0318] In an exemplary embodiment, the height h3 of the color filter pattern 10 along the plane perpendicular to the driving substrate 1 is less than or equal to 5 μm. For example, its thickness can be 1.5 μm, 1.8 μm, 2.0 μm, 2.2 μm, 2.4 μm, 2.5 μm, 2.8 μm, 3.0 μm, 3.3 μm, 3.5 μm, 3.8 μm, 4.0 μm, 4.2 μm, 4.5 μm, 4.8 μm or 5.0 μm.

[0319] In the display panel provided in the embodiment of the present application, by setting the height h3 of the color film pattern 10 perpendicular to the plane where the driving substrate 1 is located to be greater than the width d5 ​​of the color film pattern 10 parallel to the plane where the driving substrate 1 is located, on the one hand, the color film pattern 10 formed into a lens structure can have a better focusing effect; on the other hand, it indicates that the size of the sub-pixels in the display panel is small, which is suitable for preparing high-resolution (PPI) display products.

[0320] In the display panel provided in at least one embodiment of the present application, as shown in Figure 19, the height h4 of the overlapping area JD between the color filter patterns 10 of two adjacent sub-pixels along the plane perpendicular to the driving substrate 1 is greater than the width d5 ​​of the color filter pattern 10 along the plane parallel to the driving substrate 1.

[0321] In an exemplary embodiment, by setting the height h4 of the overlapping area JD between the color filter patterns 10 of two adjacent sub-pixels perpendicular to the plane on which the driving substrate 1 is located to be greater than the width d5 ​​of the color filter pattern 10 parallel to the plane on which the driving substrate 1 is located, when crosstalk light is irradiated on the overlapping area JD, the overlapping area JD can have a better absorption effect on the crosstalk light (that is, the thicker the overlapping area JD, the better the light shielding effect), thereby preventing the crosstalk light from being emitted from the display panel, improving the light crosstalk problem, and enhancing the display effect of the display panel.

[0322] In an exemplary embodiment, the display panel may further include a buffer layer or a planar layer; the buffer layer is used to cover the cathode (second electrode 5 ) to facilitate subsequent deposition of the encapsulation layer 9 , and the planar layer is used to perform a planarization function.

[0323] The above-mentioned display panel may further include other structures and components. This specification only introduces structures and components related to the invention. For other structures and components included in the display panel, reference may be made to the introduction in the relevant art.

[0324] An embodiment of the present application provides a display device, comprising a display panel as described above.

[0325] The specific structure of the display panel can be referred to in the previous description and will not be repeated here.

[0326] For example, FIG27 shows a simplified structural diagram of a display device, which further includes a cover plate CG.

[0327] The display device provided in the embodiments of the present application may be an OLED display device, wherein the OLED display device may include a glass-based OLED display device and a silicon-based OLED display device.

[0328] In addition, the display device can be a display device such as an OLED display, as well as any product or component with a display function, such as a television, a digital camera, a mobile phone, a tablet computer, etc. that includes these display devices.

[0329] In the display device provided in the embodiment of the present application, since in each first groove C1, along the direction perpendicular to the plane where the driving substrate 1 is located, the distance J1 between the part of the first curved surface HM1 located in the middle area and the driving substrate 1 is greater than the distance J2 between the part of the first curved surface HM1 located in the edge area and the driving substrate 1, this enables each first curved surface HM1 in the first groove C1 to form a structure similar to a convex lens, thereby producing a converging effect on the light emitted by the light-emitting functional layer 4 within the range of the first groove C1, and there is no need to additionally set a microlens array structure on the light-emitting side of the sub-pixel light-emitting functional layer, which saves process steps and avoids damage to the light-emitting functional layer during the thermal reflow process of the microlens process in the related technology, while also greatly improving the light-emitting efficiency of the display device, improving the brightness of the display device, and thus improving the display effect.

[0330] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A display panel, wherein: It includes a driving substrate and a plurality of sub-pixels arranged in an array on the driving substrate, wherein the sub-pixels include: A pixel definition layer, comprising a pixel opening, wherein the pixel opening comprises at least one first groove; A first electrode, disposed between the pixel definition layer and the driving substrate, a portion of the first electrode serving as a bottom of the pixel opening; A light-emitting functional layer is at least disposed in the first groove, and a portion of a surface of the light-emitting functional layer on a side away from the driving substrate and located in the first groove includes a first curved surface; The first groove includes a middle area and an edge area surrounding the middle area. In each of the first grooves, along a direction perpendicular to the plane where the drive substrate is located, a distance between a portion of the first curved surface located in the middle area and the drive substrate is greater than a distance between a portion of the first curved surface located in the edge area and the drive substrate.

2. The display panel according to claim 1, wherein: A ratio between a depth of the pixel opening along a direction perpendicular to a plane where the drive substrate is located and a maximum dimension of the pixel opening along a direction parallel to the plane where the drive substrate is located is greater than or equal to 0.

3.

3. The display panel according to claim 2, wherein: A ratio between a depth of the pixel opening along a direction perpendicular to a plane where the drive substrate is located and a maximum dimension of the pixel opening along a direction parallel to the plane where the drive substrate is located is greater than or equal to 0.3 and less than or equal to 0.

8.

4. The display panel according to claim 3, wherein: The pixel opening includes one of the first grooves, and the maximum dimension of the sub-pixel along a direction parallel to the plane where the driving substrate is located is less than or equal to 2 μm.

5. The display panel according to claim 3, wherein: The pixel opening includes at least two of the first grooves, and the maximum size of the sub-pixel along a direction parallel to the plane where the driving substrate is located is greater than or equal to 2 μm.

6. The display panel according to claim 5, wherein: The pixel opening also includes a spacing portion located between two adjacent first grooves, and the ratio of the depth of the first groove along a direction perpendicular to the plane where the drive substrate is located to the maximum dimension of the first groove along a direction parallel to the plane where the drive substrate is located is greater than or equal to 0.3 and less than or equal to 0.

8.

7. The display panel according to claim 6, wherein: A ratio between a depth of the pixel opening along a direction perpendicular to the plane where the drive substrate is located and a maximum dimension of the pixel opening along a direction parallel to the plane where the drive substrate is located is greater than a ratio between a depth of the first groove along a direction perpendicular to the plane where the drive substrate is located and a maximum dimension of the first groove along a direction parallel to the plane where the drive substrate is located.

8. The display panel according to claim 6, wherein: The spacer and the pixel definition layer are arranged in the same layer.

9. The display panel according to claim 6, wherein: The partition and the first electrode are an integrated structure.

10. The display panel according to claim 9, wherein: The first electrode includes a contact portion and a protruding portion, wherein one protruding portion is disposed between two adjacent contact portions, the contact portion serves as the bottom of the first groove, and the protruding portion serves as the spacing portion.

11. The display panel according to claim 10, wherein: The driving substrate comprises a plurality of columnar connecting electrodes, at least one of the columnar connecting electrodes is in contact with and connected to the first electrode in the sub-pixel; The orthographic projection of the columnar connecting electrode on the substrate of the driving substrate is located within the orthographic projection of the protruding portion on the substrate, and one end of the columnar connecting electrode away from the substrate protrudes from the surface of the driving substrate close to the first electrode.

12. The display panel according to claim 11, wherein: At least one break is provided on the spacer, and the light-emitting functional layers in two adjacent first grooves are connected at the position of the break.

13. The display panel according to claim 12, wherein: The depth of the fracture in a direction perpendicular to the plane where the drive substrate is located is less than or equal to the height of the spacing portion in a direction perpendicular to the plane where the drive substrate is located.

14. The display panel according to claim 12, wherein: An area enclosed by an orthographic projection of an outer contour of at least one of the fractures on the substrate overlaps with an orthographic projection of the columnar connecting electrode on the substrate.

15. The display panel according to claim 12, wherein: The plurality of breaks are symmetrically distributed about the center of the sub-pixel.

16. The display panel according to claim 12, wherein: The orthographic projection pattern of the spacer on the driving substrate includes a ring shape or a grid shape.

17. The display panel according to claim 4 or 5, wherein: The light-emitting functional layer includes a plurality of light-emitting functional sublayers sequentially arranged in a direction away from the driving substrate. In the direction away from the first electrode, the curvature of the surface of the plurality of light-emitting functional sublayers away from the driving substrate gradually decreases.

18. The display panel according to claim 17, wherein: The sub-pixel includes a second electrode, the second electrode covers the light-emitting functional layer, an average curvature of the second electrode is smaller than an average curvature of the light-emitting functional layer, and a refractive index of the second electrode is smaller than a refractive index of the light-emitting functional layer.

19. The display panel according to claim 4 or 5, wherein: In the first groove, a partial area of ​​the surface of the light-emitting functional layer away from the driving substrate is parallel to the surface of the first electrode away from the driving substrate; The ratio of the area of ​​the portion of the surface of the light-emitting functional layer away from the driving substrate and parallel to the surface of the first electrode away from the driving substrate to the area of ​​the surface of the light-emitting functional layer away from the driving substrate is less than or equal to 20%.

20. The display panel according to claim 4 or 5, wherein: The ratio of the size of the pixel opening in a direction parallel to the plane where the drive substrate is located to the distance between two adjacent first electrodes in the same direction is in a range of 0.7 to 1.

4.

21. The display panel according to claim 4 or 5, wherein: The surface of the first electrode away from the drive substrate includes a second curved surface, the orthographic projection of the first curved surface on the substrate of the drive substrate is located within the orthographic projection of the second curved surface on the substrate, and the first curved surface and the second curved surface are in opposite directions.

22. The display panel according to claim 21, wherein: The second curved surface serves as the bottom of the pixel opening, the area of ​​the region enclosed by the orthographic projection of the outer contour of the second curved surface on the driving substrate is larger than the area of ​​the region enclosed by the orthographic projection of the outer contour of the edge of the pixel opening on the driving substrate, and the side wall of the pixel opening is provided with a side recess structure at a position close to the second curved surface.

23. The display panel according to claim 21, wherein: The curvature of the second arc surface is smaller than the curvature of the first arc surface.

24. The display panel according to any one of claims 2 to 16, 18, 22 to 23, wherein: The pixel definition layer includes the pixel opening and a pixel recessed portion located between two adjacent pixel openings; The pixel recess is provided with a second groove, and an area enclosed by an orthographic projection of an outer contour of the second groove on the drive substrate falls within an area enclosed by an orthographic projection of an outer contour of a gap between two adjacent first electrodes on the drive substrate; A ratio between a maximum dimension of the second groove along a direction parallel to the plane where the drive substrate is located and a depth of the second groove along a direction perpendicular to the plane where the drive substrate is located is less than or equal to a ratio between a maximum dimension of the first groove along a direction parallel to the plane where the drive substrate is located and a depth of the first groove along a direction perpendicular to the plane where the drive substrate is located.

25. The display panel according to claim 24, wherein: The second groove divides the same pixel recessed portion into two parts; In the same direction parallel to the plane where the driving substrate is located, the ratio between the size of a portion of the pixel recessed portion and the size of the second groove is in the range of 0.7 to 1.

4.

26. The display panel according to claim 25, wherein: The absolute value of the difference between the ratio of the size of a part of the pixel recess along a direction parallel to the plane where the drive substrate is located and the size of the second recess along the same direction, and the ratio of the size of the pixel opening along a direction parallel to the plane where the drive substrate is located and the distance between two adjacent first electrodes along the same direction is less than or equal to 0.

1.

27. The display panel according to claim 25, wherein: In the same direction parallel to the plane where the driving substrate is located, the absolute value of the size difference between two adjacent gaps is smaller than the absolute value of the size difference between two parts on the same pixel recess.

28. The display panel according to claim 27, wherein: The plurality of sub-pixels include a first sub-pixel, a second sub-pixel and a third sub-pixel, and the first sub-pixel, the second sub-pixel and the third sub-pixel display different colors; In a direction parallel to the plane where the driving substrate is located, an absolute value of a size difference between the gap between the first sub-pixel and the second sub-pixel and the gap between the second sub-pixel and the third sub-pixel is smaller than an absolute value of a size difference between the second groove between the first sub-pixel and the second sub-pixel and the second groove between the second sub-pixel and the third sub-pixel; An absolute value of a size difference between the gap between the second sub-pixel and the third sub-pixel and the gap between the third sub-pixel and the first sub-pixel is smaller than an absolute value of a size difference between the second groove between the second sub-pixel and the third sub-pixel and the second groove between the third sub-pixel and the first sub-pixel.

29. The display panel according to claim 28, wherein: In a direction parallel to the plane where the driving substrate is located, an absolute value of a size difference between the gap between the first sub-pixel and the second sub-pixel and the gap between the second sub-pixel and the third sub-pixel is smaller than an absolute value of a size difference between the pixel recessed portion between the first sub-pixel and the second sub-pixel and the pixel recessed portion between the second sub-pixel and the third sub-pixel; An absolute value of a size difference between the gap between the second sub-pixel and the third sub-pixel and the gap between the third sub-pixel and the first sub-pixel is smaller than an absolute value of a size difference between the pixel recess between the second sub-pixel and the third sub-pixel and the pixel recess between the third sub-pixel and the first sub-pixel.

30. The display panel according to claim 24, wherein: A partial area of ​​the light-emitting functional layer is arranged in the second groove and on the surface of the pixel recessed portion away from the driving substrate, and the portion of the surface of the light-emitting functional layer away from the driving substrate located in the second groove includes a third curved surface; the curvature of the first curved surface is smaller than the curvature of the third curved surface.

31. The display panel according to claim 30, wherein: The curvature of the first curved surface is greater than the curvature of a portion of the light-emitting functional layer that is disposed on a surface of the pixel recess away from the driving substrate.

32. The display panel according to claim 28, wherein: The curvature of the light-emitting functional layer of at least one of the first sub-pixel and the second sub-pixel is greater than the curvature of the light-emitting functional layer of the third sub-pixel.

33. The display panel according to claim 32, wherein: The area of ​​the light-emitting region of the first sub-pixel is smaller than the area of ​​the light-emitting region of the second sub-pixel, and the area of ​​the light-emitting region of the second sub-pixel is smaller than the area of ​​the light-emitting region of the third sub-pixel; The curvature of the light-emitting functional layer of the first sub-pixel is greater than the curvature of the light-emitting functional layer of the second sub-pixel, and the curvature of the light-emitting functional layer of the second sub-pixel is greater than the curvature of the light-emitting functional layer of the third sub-pixel.

34. The display panel according to claim 24, wherein: The sub-pixel comprises a second electrode, an encapsulation layer and a color filter pattern, wherein the second electrode covers the light-emitting functional layer, the encapsulation layer covers the second electrode, and the color filter pattern is located on a side of the encapsulation layer away from the second electrode; A fourth curved surface is provided at a portion of the encapsulation layer that overlaps with an orthographic projection of the first curved surface on the drive substrate, and a curvature of the fourth curved surface is smaller than a curvature of the first curved surface.

35. The display panel according to claim 34, wherein: The color filter pattern is a lens structure, the lens structure covers the fourth curved surface, and the orthographic projection of the color filter pattern on the driving substrate covers the orthographic projection of the first curved surface on the driving substrate.

36. The display panel according to claim 35, wherein: A light shielding pattern is arranged between the color filter patterns of two adjacent sub-pixels, and a partial area of ​​the color filter pattern is arranged on a side of the light shielding pattern away from the driving substrate; An area enclosed by an orthographic projection of an outer contour of the second groove on the driving substrate falls within an orthographic projection of the light shielding pattern on the driving substrate.

37. The display panel according to claim 35, wherein: There is an overlapping area between the color filter patterns of two adjacent sub-pixels, and an area enclosed by an orthographic projection of an outer contour of the second groove on the driving substrate falls within the orthographic projection of the overlapping area on the driving substrate.

38. The display panel according to claim 37, wherein: In the same direction parallel to the plane where the driving substrate is located, the size of the overlapping area is greater than or equal to the size of the second groove.

39. The display panel according to claim 37, wherein: The height of the color filter pattern along a plane perpendicular to the driving substrate is greater than the width of the color filter pattern along a plane parallel to the driving substrate.

40. The display panel according to claim 39, wherein: A height of an overlapping area between the color filter patterns of two adjacent sub-pixels along a plane perpendicular to the driving substrate is greater than a width of the color filter pattern along a plane parallel to the driving substrate.

41. A display device, wherein: The invention comprises the display panel according to any one of claims 1 to 40.

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