Display panel, method for manufacturing display panel, and display device

Abstract

The application discloses a display panel, a preparation method of the display panel and a display device. The display panel comprises a substrate, a pixel definition layer and a light-emitting functional layer. The pixel definition layer is arranged on one side of the substrate. The pixel definition layer comprises a pixel limiting part and a pixel opening formed by the pixel limiting part. A plurality of pixel openings are arranged in an array. At least part of the light-emitting functional layer is arranged in the pixel opening. The partition structure comprises a first part and a second part arranged in sequence on the side away from the substrate. The first part and the second part at least partially overlap in the projection of the substrate. In the direction away from the substrate, the cross-sectional area of the first part can gradually increase, and / or the cross-sectional area of the second part can gradually decrease. The light-emitting functional layer is partitioned, the possibility of crosstalk between different color sub-pixels is reduced, the first electrode is continuously arranged, the display function of the display panel is realized, and the use performance of the display panel is further improved.

Description

Technical Field

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

[0002] Organic light-emitting diodes (OLEDs) are self-emissive display devices. Compared to traditional liquid crystal displays (LCDs), OLED technology does not require a backlight and is self-emissive. OLEDs use a thin layer of organic material and a glass substrate; when current flows through, the organic material emits light. Therefore, OLED display panels can significantly save energy, be made lighter and thinner, withstand a wider range of temperature variations than LCD panels, and have a wider viewing angle. OLED display panels are expected to become the next-generation flat panel display technology after LCDs and are currently one of the most watched technologies in the flat panel display field. Summary of the Invention

[0003] This application provides a display panel, a method for manufacturing the display panel, and a display device, with the aim of improving the performance of the display panel.

[0004] An embodiment of the first aspect of this application provides a display panel, which includes a substrate, a pixel definition layer, a light-emitting functional layer, and a partition structure. The pixel definition layer is disposed on one side of the substrate and includes a pixel defining portion and a pixel opening formed by the pixel defining portion, with a plurality of pixel openings arranged in an array. The light-emitting functional layer includes a plurality of light-emitting units spaced apart, at least a portion of which is correspondingly disposed within the pixel opening. The partition structure is disposed on the side of the pixel definition layer away from the substrate, forming a partition opening that communicates with the pixel opening. The partition structure includes a first portion and a second portion sequentially disposed along a direction away from the substrate. The orthographic projection of the first portion onto the substrate and the orthographic projection of the second portion onto the substrate at least partially overlap. Along the direction away from the substrate, the first portion gradually increases in cross-sectional area parallel to the plane of the substrate, and / or the second portion gradually decreases in cross-sectional area parallel to the plane of the substrate.

[0005] According to any of the foregoing embodiments of the first aspect of this application, in a direction parallel to the plane of the substrate, the first portion has a first sidewall facing the pixel opening, and the second portion has a second sidewall facing the pixel opening, with the first sidewall and the second sidewall connected to each other.

[0006] According to any of the foregoing embodiments of the first aspect of this application, the orthographic projection of the first sidewall surface on the substrate is located within the orthographic projection of the second sidewall surface on the substrate, or the orthographic projection of the first sidewall surface on the substrate overlaps with the orthographic projection of the second sidewall surface on the substrate.

[0007] According to any of the foregoing embodiments of the first aspect of this application, the first portion has a first surface that is attached to the pixel defining portion, and the second portion has a second surface on the side opposite to the substrate, wherein the orthographic projection of the second surface on the substrate is located within the orthographic projection of the first surface on the substrate.

[0008] According to any of the foregoing embodiments of the first aspect of this application, the first portion has a first surface that is attached to the pixel defining portion, the cross section of the first side wall and / or the second side wall along the thickness direction of the display panel is a straight line, the angle between the first side wall and the plane where the first surface is located is α1, the angle between the second side wall and the plane where the first surface is located is α2, wherein α1 > α2.

[0009] According to any of the foregoing embodiments of the first aspect of this application, α1 > 90°, and / or α2 < 90°.

[0010] According to any of the foregoing embodiments of the first aspect of this application, π-α1≤α2.

[0011] According to any of the foregoing embodiments of the first aspect of this application, the cross-section of the first sidewall and / or the second sidewall along the thickness direction of the display panel is a curve, the first portion has a first surface that fits against the pixel defining portion, the angle between the tangent of the first sidewall and the first surface is θ1, the angle between the tangent of the second sidewall and the first surface is θ2, wherein θ1 > 90°, and / or θ2 < 90°.

[0012] According to any of the foregoing embodiments of the first aspect of this application, the minimum angle between the tangent of the first sidewall and the first surface is smaller than the minimum angle between the tangent of the second sidewall and the first surface.

[0013] According to any of the foregoing embodiments of the first aspect of this application, the first portion and the second portion are integrally formed.

[0014] According to any of the foregoing embodiments of the first aspect of this application, the transition between the first sidewall and the second sidewall is smooth.

[0015] According to any of the foregoing embodiments of the first aspect of this application, in the thickness direction of the substrate, the thickness of the first portion is less than or equal to the thickness of the second portion.

[0016] According to any of the foregoing embodiments of the first aspect of this application, the thickness of the first portion is 180nm-200nm, and / or the thickness of the second portion along the thickness direction of the display panel is 200nm-220nm.

[0017] According to any of the foregoing embodiments of the first aspect of this application, the thickness of the light-emitting functional layer is 160nm-200nm.

[0018] According to any of the foregoing embodiments of the first aspect of this application, the material of the partition structure includes an insulating material.

[0019] According to any of the foregoing embodiments of the first aspect of this application, the material of the partition structure includes organic materials.

[0020] According to any of the foregoing embodiments of the first aspect of this application, the light-emitting functional layer includes a first sub-unit and a second sub-unit, the first sub-unit being located within the partition opening and abutting against at least a portion of the first portion, the second sub-unit being located on the side of the second portion away from the substrate, and the first sub-unit and the second sub-unit being spaced apart.

[0021] According to any of the foregoing embodiments of the first aspect of this application, in the thickness direction of the display panel, the thickness of the first portion is greater than or equal to the thickness of the first sub-unit.

[0022] According to any of the foregoing embodiments of the first aspect of this application, the display panel further includes a first electrode, the first electrode being located on the side of the light-emitting functional layer away from the substrate, at least a portion of the first electrode being disposed within a pixel opening and extending to the side of the second portion away from the substrate, the first electrode being disposed against at least a portion of the first portion and at least a portion of the second portion.

[0023] According to any of the foregoing embodiments of the first aspect of this application, the display panel further includes a second electrode, which is located on the side of the light-emitting functional layer near the substrate.

[0024] An embodiment of the second aspect of this application provides a method for manufacturing a display panel, comprising:

[0025] A pixel definition layer is formed on one side of the substrate thickness direction;

[0026] A first sub-material layer and a second sub-material layer are sequentially formed in the pixel definition layer along the direction away from the substrate;

[0027] The first and second material layers are patterned to form the first and second portions. The first portion gradually increases in cross-sectional area parallel to the plane of the substrate in the direction away from the substrate, and / or the second portion gradually increases in cross-sectional area parallel to the plane of the substrate in the direction away from the substrate.

[0028] According to any of the foregoing embodiments of the second aspect of this application, it further includes: preparing a first sub-unit and a second sub-unit on the side of the pixel definition layer away from the substrate, wherein the first sub-unit is located in the partition opening and abuts against at least a portion of the first portion, and the second sub-unit is a second sub-unit located on the side of the second portion away from the substrate, wherein the first sub-unit and the second sub-unit are spaced apart.

[0029] According to any of the foregoing embodiments of the second aspect of this application, in the thickness direction of the display panel, the thickness of the first portion is greater than the thickness of the first sub-unit.

[0030] According to any of the foregoing embodiments of the second aspect of this application, a first sub-unit and a second sub-unit are prepared on the side of the pixel definition layer away from the substrate. The first sub-unit is located within the partition opening and abuts against at least a portion of the first portion. The second sub-unit is located on the side of the second portion away from the substrate. The step after the first sub-unit and the second sub-unit are spaced apart further includes:

[0031] A first electrode is prepared on the side of the first subunit and the second subunit away from the substrate. At least a portion of the first electrode is disposed within the pixel opening and extends to the side of the second portion away from the substrate. The first electrode is disposed against at least a portion of the first portion and at least a portion of the second portion.

[0032] An embodiment of the third aspect of this application provides a display device, including a display panel as described above or a display panel prepared by the method described above.

[0033] In the display panel, display panel fabrication method, and display device provided in the first aspect embodiment of this application, the display panel includes a substrate, a pixel definition layer, and a light-emitting functional layer. The pixel definition layer is disposed on one side of the substrate and includes a pixel defining portion and a pixel opening formed by the pixel defining portion, with a plurality of pixel openings arrayed. The light-emitting functional layer includes a plurality of light-emitting units spaced apart, at least a portion of which is correspondingly disposed within the pixel opening. The pixel defining portion is used to improve the problem of different color light-emitting units interleaving, and the light-emitting units are used to realize the display function of the display panel. The partition structure includes a first portion and a second portion sequentially disposed on a side away from the substrate. In a direction parallel to the plane of the substrate, the first portion has a first sidewall facing the pixel opening, and the second portion has a second sidewall facing the pixel opening. The orthographic projection of the first sidewall onto the substrate and the orthographic projection of the second sidewall onto the substrate at least partially overlap. Optionally, the cross-sectional area of ​​the first segment can gradually increase along the direction away from the substrate, providing guidance for the evaporation of the organic layer, reducing the deposition shadow effect, and ensuring that the organic layer slopes uniformly along the sidewall. Due to the shadow effect of material deposition, at least some of the light-emitting material is unlikely to fall into the "shadow area" directly below the first segment, thereby isolating the light-emitting functional layer to form a light-emitting unit located within the isolation opening, thus reducing the possibility of crosstalk between different color sub-pixels. Optionally, the cross-sectional area of ​​the second segment can gradually decrease, which can reduce the step difference between the second segment and the light-emitting unit within the isolation opening, improve the slope ability of the first electrode on the second sidewall of the isolation structure, and reduce the possibility of discontinuity or breakage of coverage due to steep angles. The first electrode, which is set across the entire surface, forms a continuous conductive network, reduces lateral resistance, and allows the current to be evenly distributed to each sub-pixel, reducing brightness unevenness or dark areas caused by local voltage drops. Optionally, the cross-sectional area of ​​the first part can be gradually increased while the cross-sectional area of ​​the second part can be gradually decreased, thereby isolating the light-emitting functional layer, reducing the possibility of crosstalk between different color sub-pixels, and continuously setting the first electrode to realize the display function of the display panel, further improving the performance of the display panel. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 One of the top views of a display panel provided in an embodiment of this application;

[0036] Figure 2 for Figure 1One of the sectional views at point AA;

[0037] Figure 3 for Figure 2 Enlarged view of a section of the central partition structure;

[0038] Figure 4 for Figure 1 Sectional view at point AA (second section);

[0039] Figure 5 for Figure 4 Enlarged view of a section of the central partition structure;

[0040] Figure 6 This is a schematic diagram of the structure of the stacked device provided in the embodiments of this application;

[0041] Figure 7 One of the flowcharts for a method of manufacturing a display panel provided in an embodiment of this application;

[0042] Figure 8 This is a second flowchart illustrating a method for manufacturing a display panel according to an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 10. Display panel;

[0045] 100, Substrate; 110, Substrate; 120, First insulating layer; 130, Second insulating layer; 140, Third insulating layer; 150, Driving circuit; 151, Transistor; 151a, Gate; 151b, Source / drain; 152, Storage capacitor; 152a, First electrode; 152b, Second electrode;

[0046] 200, Pixel definition layer; 210, Pixel limiting section; 220, Pixel opening;

[0047] 300, partition structure; 310, partition opening; 320, first section; 321, first side wall; 330, second section; 332, second side wall; 340, first opening; 350, conversion unit;

[0048] 400, Light-emitting functional layer; 401, Sub-light-emitting layer; 410, First sub-unit; 420, First electrode; 430, Second electrode; 440, Second sub-unit; 450, Charge generation layer;

[0049] 600, Encapsulation layer; 610, First encapsulation layer; 620, Second encapsulation layer; 630, Third encapsulation layer;

[0050] E1, first surface; E2, second surface;

[0051] X, first direction; Y, second direction; Z, display panel thickness direction. Detailed Implementation

[0052] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] Organic light-emitting diodes (OLEDs) are self-emissive display devices. Compared to traditional liquid crystal displays (LCDs), OLED technology does not require a backlight and is self-emissive. OLEDs use a thin layer of organic material and a glass substrate; when current flows through, the organic material emits light. Therefore, OLED display panels can significantly save energy, be made lighter and thinner, withstand a wider range of temperature variations than LCD panels, and have a wider viewing angle. OLED display panels are expected to become the next-generation flat panel display technology after LCDs and are currently one of the most watched technologies in the flat panel display field.

[0056] In recent years, with the continuous development of display technology, organic light-emitting dual-layer OLEDs have become a research hotspot in the display field due to their advantages of long lifespan and low power consumption. However, improper angle settings of existing isolation pillars can affect the climbing ability of the organic layer and the cathode, leading to defects such as breakage or crosstalk.

[0057] Specifically, if the angle of the isolation pillars is too large, the cathode and organic layer are prone to breakage during the deposition process. If the angle is too small, the organic layer between adjacent pixels cannot be effectively isolated, resulting in crosstalk between pixels and affecting the display effect. Therefore, how to reasonably set the angle of the isolation pillars to ensure good coverage of the organic layer and cathode while reducing pixel crosstalk has become a critical problem that urgently needs to be solved. This application is proposed to solve or improve the above technical problems.

[0058] This application provides a display panel, a display device, and a vehicle, which will be described below in conjunction with... Figures 1 to 7 The display panel, the method for manufacturing the display panel, and various embodiments of the display device are described.

[0059] Figure 1 This is one of the top views of a display panel provided in an embodiment of this application. Figure 2 for Figure 1 One of the sectional views at point AA in the middle. Figure 3 for Figure 2 Enlarged view of a section of the central partition structure. Figure 4 for Figure 1 The second sectional view at point AA. Figure 5 for Figure 4 A magnified view of a portion of the central partition structure.

[0060] Please see Figures 1 to 5The first aspect of this application provides a display panel 10, which includes a substrate 100, a pixel definition layer 200, a light-emitting functional layer 400, and a partition structure 300. The pixel definition layer 200 is disposed on one side of the substrate 100, and includes a pixel defining portion 210 and a pixel opening 220 formed by the pixel defining portion 210. A plurality of pixel openings 220 are arrayed. At least a portion of the light-emitting functional layer 400 is correspondingly disposed within the pixel opening 220. A partition structure 300 is disposed on the side of the pixel definition layer 200 away from the substrate 100. The partition structure 300 encloses and forms a partition opening 310, which communicates with the pixel opening 220. The partition structure 300 includes a first portion 320 and a second portion 330. The first portion 320 and the second portion 330 are arranged sequentially along the direction away from the substrate 100. The orthographic projection of the first portion 320 on the substrate 100 and the orthographic projection of the second portion 330 on the substrate 100 at least partially overlap. In the direction away from the substrate 100, the cross-sectional area of ​​the first portion 320 gradually increases along the plane parallel to the substrate 100, and / or the cross-sectional area of ​​the second portion 330 gradually decreases along the plane parallel to the substrate 100.

[0061] In the display panel 10 provided in this embodiment, the display panel 10 includes a substrate 100, a pixel definition layer 200, and a light-emitting functional layer 400. The pixel definition layer 200 is disposed on one side of the substrate 100, and includes a pixel defining portion 210 and a pixel opening 220 formed by the pixel defining portion 210. A plurality of pixel openings 220 are arranged in an array. At least a portion of the light-emitting functional layer 400 is correspondingly disposed within the pixel opening 220. The pixel defining portion 210 is used to improve the crosstalk problem of different color sub-pixels, and the at least a portion of the light-emitting functional layer 400 located within the pixel opening 220 is used to realize the display function of the display panel 10.

[0062] Optionally, the substrate 100 can be configured in various ways. For example, the substrate 100 may include a substrate 110 and a driving circuit 150 disposed on the side of the substrate 110 facing the light-emitting functional layer 400. Exemplarily, the driving circuit 150 may include a transistor 151, a storage capacitor 152, and driving signal lines for connecting various devices. The transistor 151 may include a semiconductor, a gate 151a, and source / drain electrodes 151b. The storage capacitor 152 may include a first electrode 152a and a second electrode 152b.

[0063] Optionally, the substrate 100 may further include a first insulating layer 120, a second insulating layer 130 and a third insulating layer 140 disposed on one side of the substrate 110 and sequentially stacked in a direction away from the substrate 110.

[0064] Optionally, the display panel 10 further includes a first electrode 420 and a second electrode 430. The first electrode 420 is located on the side of the light-emitting functional layer 400 away from the substrate 100, and the second electrode 430 is located on the side of the light-emitting functional layer 400 close to the substrate 100. The first electrode 420 and the second electrode 430 are used to drive the light-emitting unit to emit light. One of the first electrode 420 and the second electrode 430 is an anode, and the other is a cathode. In this embodiment, the first electrode 420 is used as the cathode and the second electrode 430 is used as the anode for illustration.

[0065] Optionally, the material of the first electrode 420 can be at least one of the following metals: silver (Ag), aluminum (Al), lithium (Li), magnesium (Mg), ytterbium (Yb), calcium (Ca), or indium (In). The first electrode 420 can also be an alloy of the aforementioned metals, such as magnesium-silver alloy (Mg / Ag) or lithium-aluminum alloy (Li / Al). This embodiment does not impose any limitations on this.

[0066] Optionally, the material of the second electrode 430 is generally a material with a high work function to improve hole injection efficiency. The second electrode 430 can be at least one of gold (Au), platinum (Pt), titanium (Ti), silver (Ag), indium tin oxide (ITO), zinc tin oxide (IZO), or a transparent conductive polymer (such as polyaniline). For example, the second electrode 430 can be made of ITO-Ag-ITO composite material, without any particular limitation.

[0067] Optionally, the light-emitting functional layer 400 includes at least one of an electron injection layer (EIL), an electron transport layer (ETL), a light-emitting material layer (EML), a hole injection layer (HIL), and a hole transport layer (HTL).

[0068] A partition structure 300 is disposed on the side of the pixel definition layer 200 facing away from the substrate 100. The partition structure 300 encloses and forms a partition opening 310, which communicates with the pixel opening 220. The partition structure 300 can be used to participate in the division of sub-pixels of the display panel 10, reducing the problem of crosstalk between adjacent sub-pixels.

[0069] Optionally, there may be multiple partition structures 300. For example, the partition structure 300 may be in the form of a grid, and the hollow areas in the grid-shaped partition structure 300 may form multiple partition openings 310.

[0070] The partition structure 300 includes a first portion 320 and a second portion 330 arranged sequentially on the side away from the substrate 100, wherein the orthographic projection of the first portion 320 on the substrate 100 and the orthographic projection of the second portion 330 on the substrate 100 at least partially overlap.

[0071] Optionally, the orthographic projection of the second portion 330 onto the substrate 100 may also be located within the orthographic projection of the first portion 320 onto the substrate 100, or the orthographic projection of the first portion 320 onto the substrate 100 may be located within the orthographic projection of the second portion 330 onto the substrate 100.

[0072] Optionally, along the direction away from the substrate 100, the cross-sectional area of ​​the first portion 320 parallel to the plane of the substrate 100 can gradually increase, providing guidance for the evaporation of the organic layer, reducing the deposition shadow effect, and ensuring that the organic layer slopes uniformly along the sidewall. Due to the shadow effect of material deposition, at least some of the light-emitting material is unlikely to fall into the "shadow area" directly below the first portion 320, thereby isolating the light-emitting functional layer 400 to form a light-emitting unit located within the isolation opening 310, thereby reducing the possibility of crosstalk between different color sub-pixels.

[0073] Optionally, the shadowing effect of deposition is a phenomenon that occurs during physical vapor deposition (such as evaporation and sputtering) where the microstructure (such as isolation pillars or raised patterns) on the surface of the substrate 100 prevents the material from uniformly covering all areas. The core reason is the combined effect of the directional movement (approximately linear propagation) of the deposited material and the geometry of the substrate 100 structure, causing certain areas to be obscured and forming "shadow areas."

[0074] Optionally, the cross-sectional area of ​​the second portion 330 along the plane parallel to the substrate 100 can gradually decrease. This can reduce the step difference between the second portion 330 and the light-emitting unit within the partition opening 310, improve the climbing ability of the first electrode 420 on the second sidewall 332 of the partition structure 300, and reduce the possibility of discontinuity or breakage in coverage due to steep angles. The first electrode 420, which is disposed across the entire surface, reduces the lateral resistance, allowing the current to be evenly distributed to each sub-pixel, reducing uneven brightness or dark areas caused by local voltage drops.

[0075] Optionally, the cross-sectional area of ​​the first portion 320 can be gradually increased while the cross-sectional area of ​​the second portion 330 can be gradually decreased, thereby isolating the light-emitting functional layer 400, reducing the possibility of crosstalk between different color sub-pixels, and continuously setting the first electrode 420 to realize the display function of the display panel 10, further improving the performance of the display panel 10.

[0076] In some alternative embodiments, in a direction parallel to the plane of the substrate 100, the first portion 320 has a first sidewall 321 facing the pixel opening 220, and the second portion 330 has a second sidewall 332 facing the pixel opening 220, with the first sidewall 321 and the second sidewall 332 connected to each other.

[0077] Optionally, the orthographic projection of the second sidewall 332 onto the substrate 100 is located within the orthographic projection of the first sidewall 321 onto the substrate 100, or the orthographic projection of the first sidewall 321 onto the substrate 100 overlaps with the orthographic projection of the second sidewall 332 onto the substrate 100, which facilitates fabrication.

[0078] Optionally, the first portion 320 has a first surface E1 that is in contact with the pixel defining portion 210, and the second portion 330 has a second surface E2 on the side opposite to the substrate 100, wherein the orthographic projection of the second surface E2 on the substrate 100 is located within the orthographic projection of the first surface E1 on the substrate 100.

[0079] In these optional embodiments, since the pixel opening 220 and the partition structure 300 are not on the same plane, the first portion 320 is provided with a first sidewall 321 facing the pixel opening 220 in a direction parallel to the plane of the substrate 100, and the second portion 330 is provided with a second sidewall 332 facing the pixel opening 220. The orthographic projection of the second sidewall 332 onto the substrate 100 is located within the orthographic projection of the first sidewall 321 onto the substrate 100, such that the step difference between the second portion 330 and the light-emitting functional layer 400 is greater than the step difference between the first portion 320 and the first electrode 420, thereby facilitating the continuous provision of the first electrode 420 while isolating the light-emitting functional layer 400.

[0080] In some alternative embodiments, such as Figure 2 and Figure 3 As shown, the first portion 320 has a first surface E1 that is in contact with the pixel limiting portion 210. The cross-section of the first side wall 321 and / or the second side wall 332 along the thickness direction Z of the display panel is a straight line. The angle between the first side wall 321 and the plane where the first surface E1 is located is α1, and the angle between the second side wall 332 and the plane where the first surface E1 is located is α2, where α1 > α2.

[0081] Optionally, 90° < α1 < 180°, and / or α2 < 90°. For example, α1 can be 100°, 110°, 130°, 150°, or 170°. This can reduce the possibility of excessively gentle slope caused by an angle α1 that is too small, making it difficult to isolate the light-emitting functional layer 400 and causing crosstalk between light-emitting units of different colors, thereby further improving the performance of the display panel 10. For example, α2 can be 10°, 30°, 40°, 50°, or 70°. This can reduce the possibility of excessively steep slope caused by an angle α2 that is too large, resulting in an excessively large step difference between the second portion 330 and the light-emitting units within the isolation opening 310. This reduces the climbing ability of the first electrode 420 on the second side wall 332, thereby reducing the possibility of isolating the first electrode 420 and further improving the performance of the display panel 10.

[0082] Optionally, π-α1≤α2 can be understood as the slope of the first part 320 being gentler than the slope of the second part 330 or the slopes being equal, which is beneficial for the separation of the light-emitting functional layer 400 while also facilitating the overall forming of the first electrode 420.

[0083] In these optional embodiments, the cross-section of the first sidewall 321 and / or the second sidewall 332 along the thickness direction Z of the display panel is a straight line, the angle between the first sidewall 321 and the first surface E1 is α1, and the angle between the second sidewall 332 and the first surface E1 is α2, where α1 > α2. This facilitates the separation of the light-emitting functional layer 400 while also facilitating the overall forming of the first electrode 420.

[0084] In some alternative embodiments, such as Figure 4 and Figure 5 As shown, the cross-section of the first sidewall 321 and / or the second sidewall 332 along the thickness direction Z of the display panel is a curve. The first portion 320 has a first surface E1 that is in contact with the pixel limiting portion 210. The angle between the tangent of the first sidewall 321 and the plane where the first surface E1 is located is θ1, and the angle between the tangent of the second sidewall 332 and the plane where the first surface E1 is located is θ2, wherein 90° < θ1 < 180°, and / or θ2 < 90°.

[0085] Optionally, 90° < θ1 < 180°, and / or α2 < 90°. For example, θ1 can be 100°, 110°, 130°, 150°, or 170°. θ1 can reduce the possibility of excessively gentle slope due to a small angle, making it difficult to isolate the light-emitting functional layer 400 and causing crosstalk between sub-pixels of different colors, thereby further improving the performance of the display panel 10. For example, θ2 can be 10°, 30°, 40°, 50°, or 70°. This can reduce the possibility of excessively steep slope due to a large angle θ2, which would result in an excessively large step difference between the second portion 330 and the light-emitting unit within the partition opening 310, reducing the climbing ability of the first electrode 420 on the second sidewall 332 and thus isolating the first electrode 420, thereby further improving the performance of the display panel 10.

[0086] Optionally, the minimum angle between the tangent of the first sidewall 321 and the first surface E1 is smaller than the minimum angle between the tangent of the second sidewall 332 and the first surface E1. This facilitates the separation of the light-emitting functional layer 400, the ramping of the first electrode 420, and the overall forming of the first electrode 420.

[0087] Optionally, the first part 320 and the second part 330 can be prepared separately or in the same process step, simplifying the process steps.

[0088] Optionally, the first portion 320 and the second portion 330 can be integrally formed, allowing them to be manufactured in the same process step, further simplifying the process steps for manufacturing the first portion 320 and the second portion 330. This also reduces the problem of the partition structure 300 collapsing due to stress concentration during the vapor deposition process, improving the stability of the display panel 10.

[0089] Optionally, the transition between the first sidewall 321 and the second sidewall 332 is smooth, which reduces the possibility of damaging the first electrode 420, improves the stability of the display panel 10 structure, and extends the service life of the display panel 10.

[0090] In some alternative embodiments, the orthographic projection of the first sidewall 321 onto the substrate 100 lies within the orthographic projection of the second sidewall 332 onto the substrate 100.

[0091] Optional, such as Figure 4 and Figure 5 As shown, the first portion 320 has a first surface E1 that is in contact with the pixel defining portion 210, and the second portion 330 has a second surface E2 on the side opposite to the substrate 100. The orthographic projection of the second surface E2 onto the substrate 100 is located within the orthographic projection of the first surface E1 onto the substrate 100.

[0092] In some alternative embodiments, the thickness of the first portion 320 is greater than the thickness of the light-emitting functional layer 400 in the thickness direction of the substrate 100.

[0093] Optionally, the thickness of the first portion 320 along the thickness direction Z of the display panel is 180nm-220nm, and / or the thickness of the second portion 330 along the thickness direction Z of the display panel is 180nm-220nm. For example, the thickness of the first portion 320 can be 180nm, 190nm, 200nm, 210nm, or 220nm. This can improve the problem of difficulty in separating the light-emitting functional layer 400 due to the first portion 320 being too thin, and can also improve the problem of difficulty in forming the first electrode 420 on a whole surface due to the first portion 320 being too thick, as well as the problem of affecting the thinness of the display panel 10. For example, the thickness of the second portion 330 can be 180nm, 190nm, 200nm, 210nm, or 220nm. This can improve the problem of difficulty in separating the light-emitting functional layer 400 due to the second portion 330 being too thin, and can also improve the problem of difficulty in forming the first electrode 420 on a whole surface due to the second portion 330 being too thick, while also affecting the thinness of the display panel 10.

[0094] Optionally, the thickness of the first portion 320 and the thickness of the second portion 330 can be equal or unequal. There are no specific requirements for the thickness of the first portion 320 and the second portion 330, as long as the thickness of the first portion 320 is greater than the thickness of the light-emitting functional layer 400, the light-emitting functional layer 400 can be isolated, and the first electrode 420 can be formed on the whole surface.

[0095] Optionally, the thickness of the light-emitting functional layer 400 is 100nm-200nm. For example, the thickness of the light-emitting functional layer 400 can be 100nm, 130nm, 150nm, 170nm, or 200nm. This can reduce the possibility of crosstalk between adjacent light-emitting units caused by excessive thickness of the light-emitting functional layer 400, and further benefit the thinness of the display panel 10.

[0096] In these alternative embodiments, the thickness of the first portion 320 is greater than the thickness of the light-emitting functional layer 400, which allows the first portion 320 to isolate the light-emitting functional layer 400, thereby reducing the possibility of crosstalk between light-emitting units of different colors and further improving the performance of the display panel 10.

[0097] Optionally, the material of the partition structure 300 includes insulating material. Using insulating organic material as the partition structure 300 can ensure adhesion to the pixel definition layer 200, reduce electrical interference with the first electrode 420 or the light-emitting functional layer 400, and adapt to the process requirements of high-resolution display for fine patterning.

[0098] Optionally, the partition structure 300 may be made of organic materials, which are inexpensive, easy to manufacture, and have good insulation properties.

[0099] In some optional embodiments, the light-emitting functional layer 400 includes a first sub-unit 410 and a second sub-unit 440. The first sub-unit 410 is located within the partition opening 310 and abuts against at least a portion of the first portion 320. The second sub-unit 440 is located on the side of the second portion 330 away from the substrate 100. The first sub-unit 410 and the second sub-unit 440 are spaced apart.

[0100] Optionally, in the thickness direction of the display panel 10, the thickness of the first portion 320 is greater than the thickness of the first sub-unit 410, thereby increasing the step difference between the first portion 320 and the first sub-unit 410, which facilitates the separation of the light-emitting functional layer 400 into the first sub-unit 410 and the second sub-unit 440, and reduces crosstalk between different color sub-pixels.

[0101] Optionally, in OLED devices, if only a single-layer device is used to achieve high brightness, it will lead to excessive driving current and a surge in heat, affecting the device's performance and lifespan. Existing technologies typically utilize stacked OLEDs to increase luminous brightness. Stacked OLED devices connect two or more light-emitting units in series through a charge generation layer, thereby improving current efficiency, extending device lifespan, and meeting the brightness requirements for lighting applications.

[0102] Optional, such as Figure 4 and Figure 6 As shown, the display panel 10 can be a stacked device, that is, the light-emitting functional layer 400 includes a plurality of sub-light-emitting layers 401 stacked sequentially on the side away from the substrate 100. It can be understood that the first sub-unit 410 includes a plurality of stacked sub-light-emitting layers 401. The thickness of the first portion 320 is greater than the sum of the thicknesses of the plurality of stacked sub-light-emitting layers 401, thereby increasing the step difference between the first portion 320 and the first sub-unit 410, which facilitates the separation of the light-emitting functional layer 400 into the first sub-unit 410 and the second sub-unit 440, and reduces crosstalk between different color sub-pixels.

[0103] Optionally, among the multiple sub-light-emitting layers 401 stacked together, a charge-generating layer 450 is provided between adjacent layers. Multiple light-emitting units share a single charge-generating layer 450, and by connecting multiple light-emitting units in series through the charge-generating layer 450, the brightness of the display panel 10 can be increased.

[0104] In these optional embodiments, the first sub-unit 410 and the second sub-unit 440 are spaced apart, which can reduce crosstalk between different color sub-pixels and further improve the display effect of the display panel 10.

[0105] In some optional embodiments, the first electrode 420 is located on the side of the light-emitting functional layer 400 away from the substrate 100, and at least a portion of the first electrode 420 is disposed within the pixel opening 220 and extends to the side of the second portion 330 away from the substrate 100. The first electrode 420 is disposed against at least a portion of the first portion 320 and at least a portion of the second portion 330.

[0106] Optional, such as Figure 2 and Figure 4 As shown, the display panel 10 also includes an encapsulation layer 600, which is located on the side of the light-emitting functional layer 400 facing away from the substrate 100. The encapsulation layer 600 is used to encapsulate the light-emitting functional layer 400, improve the problem of water and oxygen intrusion, and extend the service life of the display panel 10.

[0107] Optionally, the encapsulation layer 600 includes a first encapsulation layer 610 on the side opposite to the substrate 100. The first encapsulation layer 610 is used to implement the encapsulation function of the display panel 10 and improve the problem of moisture intrusion. The first encapsulation layer 610 is located on the side of the corresponding light-emitting functional layer 400 opposite to the substrate 100.

[0108] Optionally, the material of the first encapsulation layer 610 includes inorganic materials, which gives the first encapsulation layer 610 good density and can improve the sealing effect of the first encapsulation layer 610.

[0109] Optionally, the material of the first encapsulation layer 610 includes one or more of silicon oxide, silicon nitride, and silicon oxynitride.

[0110] Optionally, the second encapsulation layer 620 is located on the side of the first encapsulation layer 610 away from the substrate 100 to further improve the encapsulation effect.

[0111] Optionally, the material of the second encapsulation layer 620 includes an organic material, which makes the second encapsulation layer 620 have a suitable thickness, thereby improving the problem of uneven film surface of the encapsulation layer 600.

[0112] Optionally, the second encapsulation layer 620 can be prepared by inkjet printing (IJP) technology, so that the second encapsulation layer 620 has a suitable thickness.

[0113] Optionally, the display panel 10 may also include a third encapsulation layer 630, which is located on the side of the second encapsulation layer 620 away from the substrate 100.

[0114] Optionally, the material of the third encapsulation layer 630 may include inorganic materials. The encapsulation layer 600 includes a first encapsulation layer 610, a second encapsulation layer 620, and a third encapsulation layer 630. The encapsulation layer 600 has a sandwich structure, which can further improve the encapsulation effect.

[0115] Optionally, the third encapsulation layer 630 and the first encapsulation layer 610 are made of the same material, which gives the third encapsulation layer 630 good density and allows the third encapsulation layer 630 and the first encapsulation layer 610 to be manufactured using the same process equipment and materials, thereby reducing the manufacturing cost of the display panel 10.

[0116] Optionally, the side of the encapsulation layer 600 facing away from the substrate 100 may also include a touch layer, which is used to implement the touch function of the display panel 10.

[0117] A second aspect of this application provides a method for manufacturing a display panel 10, such as... Figure 4 and Figure 7 As shown, it includes:

[0118] Step S100: A pixel definition layer 200 is formed on one side of the substrate 100 in the thickness direction.

[0119] Step S200: A first portion 320 material layer and a second portion 330 material layer are sequentially formed on the pixel definition layer 200 in a direction away from the substrate 100.

[0120] Step S300: Pattern the material layer of the first portion 320 and the material layer of the second portion 330 to form the first portion 320 and the second portion 330. The first portion 320 gradually increases in cross-sectional area along the plane parallel to the substrate 100 in the direction away from the substrate 100, and / or the second portion 330 gradually increases in cross-sectional area along the plane parallel to the substrate 100 in the direction away from the substrate 100.

[0121] In the method for fabricating the display panel 10 provided in this application embodiment, a pixel definition layer 200 is formed in step S100, a first portion 320 material layer and a second portion 330 material layer are obtained in step S200, and the first portion 320 and the second portion 330 are obtained in step S300. In this application embodiment, by gradually increasing the cross-sectional area of ​​the first portion 320 along the direction away from the substrate 100, a guiding effect is provided for the evaporation of the organic layer, reducing the deposition shadow effect and ensuring that the organic layer uniformly slopes along the sidewall. Due to the shadow effect of material deposition, at least some of the light-emitting material is unlikely to fall into the "shadow area" directly below the first portion 320, thereby isolating the light-emitting functional layer 400 to form a light-emitting unit located within the isolation opening 310, thereby reducing the possibility of crosstalk between different color sub-pixels.

[0122] The cross-sectional area of ​​the second portion 330 can gradually decrease along the plane parallel to the substrate 100, which can reduce the step difference between the second portion 330 and the light-emitting unit within the partition opening 310, improve the climbing ability of the first electrode 420 on the second sidewall 332 of the partition structure 300, and reduce the possibility of discontinuity or breakage in coverage due to steep angles. The first electrode 420, which is disposed across the entire surface, forms a continuous conductive network, reduces lateral resistance, and allows current to be evenly distributed to each sub-pixel, reducing uneven brightness or dark areas caused by local voltage drops.

[0123] While the cross-sectional area of ​​the first portion 320 can be gradually increased, the cross-sectional area of ​​the second portion 330 can be gradually decreased, thereby isolating the light-emitting functional layer 400 and reducing the possibility of crosstalk between different color sub-pixels. At the same time, the first electrode 420 is continuously set to realize the display function of the display panel 10 and further improve the performance of the display panel 10.

[0124] In some alternative embodiments, such as Figure 4 and Figure 8 As shown, after step S300, the following steps are also included:

[0125] Step S400: A first sub-unit 410 and a second sub-unit 440 are prepared on the side of the pixel definition layer 200 away from the substrate 100. The first sub-unit 410 is located within the partition opening 310 and abuts against at least a portion of the first portion 320. The second sub-unit 440 is located on the side of the second portion 330 away from the substrate 100. The first sub-unit 410 and the second sub-unit 440 are spaced apart.

[0126] Optionally, in the thickness direction of the display panel 10, the thickness of the first portion 320 is greater than the thickness of the first subunit 410.

[0127] In these alternative embodiments, step S400 isolates the light-emitting functional layer 400 to form a light-emitting unit located within the isolation opening 310, thereby reducing the possibility of crosstalk between different color sub-pixels.

[0128] Optional, such as Figure 3 and Figure 8 As shown, the steps following step S400 also include:

[0129] Step S500: A first electrode 420 is prepared on the side of the first sub-unit 410 and the second sub-unit 440 away from the substrate 100. At least a portion of the first electrode 420 is disposed in the pixel opening 220 and extends to the side of the second portion 330 away from the substrate 100. The first electrode 420 is disposed against at least a portion of the first portion 320 and at least a portion of the second portion 330.

[0130] Step S500 enhances the climbing ability of the first electrode 420 on the second sidewall 332 of the partition structure 300, reducing the possibility of discontinuities or breaks in coverage caused by steep angles. The first electrode 420, which is set across the entire surface, forms a continuous conductive network, reducing lateral resistance and allowing current to be evenly distributed to each sub-pixel, thus reducing uneven brightness or dark areas caused by local voltage drops.

[0131] Optionally, the first portion 320 and / or the second portion 330 are prepared by photolithography, which is a simple process and can achieve the morphology of the first portion 320 and the second portion 330 in the embodiments of this application.

[0132] The display device according to the third aspect of this application includes a display panel 10 prepared by the display panel 10 provided by any of the embodiments of the first aspect above or the display panel 10 preparation method provided by any of the embodiments of the second aspect above.

[0133] Since the display device of the embodiment of the third aspect of this application includes the display panel 10 provided in any of the first aspect embodiments or the display panel 10 prepared by the method for preparing the display panel 10 provided in any of the second aspect embodiments, the display device of the embodiment of the third aspect of this application has the beneficial effects of the display panel 10 provided in any of the first aspect embodiments or the display panel 10 prepared by the method for preparing the display panel 10 provided in any of the second aspect embodiments, which will not be elaborated here.

[0134] The display devices in this application include, but are not limited to, mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, control consoles, and other devices with display functions.

[0135] The above are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

[0136] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

Claims

1. A display panel, characterized in that, The display panel includes: substrate; A pixel definition layer is disposed on one side of the substrate. The pixel definition layer includes a pixel defining portion and a pixel opening formed by the pixel defining portion, and a plurality of the pixel openings are distributed in an array. A light-emitting functional layer, at least a portion of which is disposed within the pixel opening; A partition structure is disposed on the side of the pixel definition layer away from the substrate. The partition structure encloses and forms a partition opening, which communicates with the pixel opening. The partition structure includes a first part and a second part, which are arranged sequentially along the direction away from the substrate. The orthographic projection of the first part on the substrate and the orthographic projection of the second part on the substrate at least partially overlap. Wherein, along the direction away from the substrate, the first portion gradually increases in cross-sectional area parallel to the plane of the substrate, and / or the second portion gradually decreases in cross-sectional area parallel to the plane of the substrate.

2. The display panel according to claim 1, characterized in that, In a direction parallel to the plane of the substrate, the first portion has a first sidewall facing the pixel opening, and the second portion has a second sidewall facing the pixel opening, with the first sidewall and the second sidewall connected to each other. Preferably, the orthographic projection of the second sidewall surface onto the substrate is located within the orthographic projection of the first sidewall surface onto the substrate, or the orthographic projection of the first sidewall surface onto the substrate overlaps with the orthographic projection of the second sidewall surface onto the substrate. Preferably, the first portion has a first surface that is in contact with the pixel defining portion, and the second portion has a second surface on the side opposite to the substrate, wherein the orthographic projection of the second surface on the substrate is located within the orthographic projection of the first surface on the substrate.

3. The display panel according to claim 2, characterized in that, The first portion has a first surface that fits into the pixel defining portion. The cross-section of the first sidewall and / or the second sidewall along the thickness direction of the display panel is a straight line. The angle between the first sidewall and the plane containing the first surface is α1, and the angle between the second sidewall and the plane containing the first surface is α2, where α1 > α2. Preferably, α1 > 90°, and / or α2 < 90°; Preferably, π-α1≤α2.

4. The display panel according to claim 2, characterized in that, The first portion has a first surface that fits against the pixel defining portion. The cross-section of the first sidewall and / or the second sidewall along the thickness direction of the display panel is curved. The first portion has a first surface that fits against the pixel defining portion. The angle between the tangent of the first sidewall and the plane containing the first surface is θ1, and the angle between the tangent of the second sidewall and the plane containing the first surface is θ2, wherein θ1 > 90° and / or θ2 < 90°. Preferably, the minimum angle between the tangent of the first sidewall and the first surface is smaller than the minimum angle between the tangent of the second sidewall and the first surface. Preferably, the first portion and the second portion are integrally formed; Preferably, the transition between the first sidewall and the second sidewall is smooth.

5. The display panel according to claim 1, characterized in that, In the thickness direction of the substrate, the thickness of the first portion is greater than the thickness of the light-emitting functional layer; Preferably, the thickness of the first portion along the thickness direction of the display panel is 180nm-220nm, and / or the thickness of the second portion along the thickness direction of the display panel is 180nm-220nm; Preferably, the thickness of the first portion along the thickness direction of the display panel is equal to the thickness of the second portion along the thickness direction of the display panel; Preferably, the thickness of the light-emitting functional layer is 100nm-200nm; Preferably, the material of the partition structure includes an insulating material; Preferably, the material of the partition structure includes organic materials.

6. The display panel according to claim 1, characterized in that, The light-emitting functional layer includes a first sub-unit and a second sub-unit. The first sub-unit is located inside the partition opening and abuts against at least a portion of the first portion. The second sub-unit is located on the side of the second portion away from the substrate. The first sub-unit and the second sub-unit are spaced apart. Preferably, in the thickness direction of the display panel, the thickness of the first portion is greater than or equal to the thickness of the first sub-unit; Preferably, the light-emitting functional layer includes a plurality of sub-light-emitting layers stacked on the side opposite to the substrate; Preferably, in the thickness direction of the display panel, the thickness of the first portion is greater than or equal to the sum of the thicknesses of the plurality of sub-light-emitting layers; Preferably, among the multiple sub-light-emitting layers stacked together, a charge-generating layer is provided between adjacent layers.

7. The display panel according to claim 1, characterized in that, The display panel further includes a first electrode, which is located on the side of the light-emitting functional layer away from the substrate. At least a portion of the first electrode is disposed within the pixel opening and extends to the side of the second portion away from the substrate. The first electrode is disposed against at least a portion of the first portion and at least a portion of the second portion. Preferably, the display panel further includes a second electrode, which is located on the side of the light-emitting functional layer near the substrate.

8. A method for manufacturing a display panel, characterized in that, include: A pixel definition layer is formed on one side of the substrate thickness direction; A first sub-material layer and a second sub-material layer are sequentially formed in the pixel definition layer along a direction away from the substrate; The first and second portion material layers are patterned to form the first and second portions. The first portion gradually increases in cross-sectional area parallel to the plane of the substrate in the direction away from the substrate, and / or the second portion gradually increases in cross-sectional area parallel to the plane of the substrate in the direction away from the substrate.

9. The method for manufacturing a display panel according to claim 8, characterized in that, Also includes: A first sub-unit and a second sub-unit are prepared on the side of the pixel definition layer away from the substrate. The first sub-unit is located within the partition opening and abuts against at least a portion of the first portion. The second sub-unit is located on the side of the second portion away from the substrate. The first sub-unit and the second sub-unit are spaced apart. Preferably, in the thickness direction of the display panel, the thickness of the first portion is greater than the thickness of the first sub-unit; Preferably, a first sub-unit and a second sub-unit are fabricated on the side of the pixel definition layer opposite to the substrate. The first sub-unit is located within the partition opening and abuts against at least a portion of the first portion. The second sub-unit is located on the side of the second portion opposite to the substrate. The step after the first sub-unit and the second sub-unit are spaced apart further includes: A first electrode is formed on the side of the first sub-unit and the second sub-unit away from the substrate. At least a portion of the first electrode is disposed in the pixel opening and extends to the side of the second portion away from the substrate. The first electrode is disposed against at least a portion of the first portion and at least a portion of the second portion. Preferably, the first portion and / or the second portion are prepared by photolithography.

10. A display device, characterized in that, The display panel includes the display panel according to any one of claims 1-7 or the display panel prepared by the preparation method of the display panel according to any one of claims 8-9.

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