Display panel and display device

Abstract

The invention discloses a display panel and a display device, the display panel comprises a substrate, a first electrode layer, a first functional layer, a light emitting layer, a second functional layer and a retaining wall structure, and the first electrode layer is located on one side of the substrate and comprises a plurality of first electrodes arranged at intervals; the first functional layer, the light-emitting layer and the second functional layer are stacked in the direction away from the substrate, and the light-emitting layer comprises a plurality of light-emitting structures; the retaining wall structure comprises a limiting structure, a plurality of pixel openings formed in the limiting structure and used for containing the light-emitting structures, and containing openings formed in the limiting structure and located between the adjacent light-emitting structures. The accommodating opening is used for accommodating a part between the adjacent pixel openings in the first functional layer and a part between the adjacent pixel openings in the second functional layer, and the first functional layer and the second functional layer in the accommodating opening are in direct contact. According to the display panel provided by the invention, the display uniformity of the display panel can be improved, so that the user experience is improved.

Description

Technical Field

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

[0002] With the development of display technology, the performance requirements for display devices are getting higher and higher. Quantum dot light-emitting diodes have the advantages of high color gamut, long potential life, good viewing angle, and low cost, and are a promising future display technology. However, the existing display panels using quantum dot light-emitting diodes have the problem of poor display uniformity. Summary of the invention

[0003] The embodiments of the present application provide a display panel and a display device, which can improve the display uniformity of the display panel and thus improve the user experience.

[0004] An embodiment of a first aspect of the embodiments of the present application provides a display panel, including:

[0005] substrate;

[0006] A first electrode layer, located on one side of the substrate and comprising a plurality of first electrodes arranged at intervals;

[0007] A first functional layer, a light-emitting layer, and a second functional layer are stacked in a direction away from the substrate, the light-emitting layer comprising a plurality of light-emitting structures; a retaining wall structure comprising a limiting structure, a plurality of pixel openings provided in the limiting structure and accommodating the plurality of light-emitting structures, and an accommodating opening provided in the limiting structure and located between adjacent light-emitting structures, the accommodating opening being used to accommodate a portion of the first functional layer located between adjacent pixel openings and a portion of the second functional layer located between adjacent pixel openings, and the first functional layer located in the accommodating opening is in direct contact with the second functional layer.

[0008] According to an embodiment of the first aspect of the present invention, the limiting structure comprises a first limiting structure, and the receiving opening exposes a partial area of ​​the substrate located between adjacent first electrodes;

[0009] Preferably, along a direction parallel to the substrate, a minimum distance between a side of the first limiting structure close to the pixel opening and a side away from the pixel opening is S, and S is less than 5 um;

[0010] Preferably, S<2um;

[0011] Preferably, the material of the first limiting structure includes at least one of polyimide, epoxy resin, acrylic resin, silicone resin, silicon nitride, silicon oxide and fluorine-containing compounds;

[0012] Preferably, the fluorine-containing compound is a compound comprising a perfluoromethyl group, a perfluoroethyl group or a perfluorophenyl group, or a derivative of a compound comprising a perfluoromethyl group, a perfluoroethyl group or a perfluorophenyl group;

[0013] Preferably, the first limiting structure is made of a hydrophobic material.

[0014] According to any of the aforementioned embodiments of the first aspect of the present invention, the area of ​​the substrate opposite to the accommodating opening also includes a groove portion, the orthographic projection of the limiting structure on the substrate has no overlap with the groove portion, and the thickness of the groove portion along the direction perpendicular to the substrate is H, 0μm<H≤10μm.

[0015] According to any of the aforementioned embodiments of the first aspect of the present invention, the limiting structure comprises a second limiting structure and a third limiting structure stacked in a direction away from the substrate, the orthographic projection of the third limiting structure on the substrate is located within the orthographic projection of the second limiting structure on the substrate, and the accommodating opening penetrates the third limiting structure in a direction perpendicular to the substrate;

[0016] Preferably, the second limiting structure comprises a receiving groove, and the third limiting structure is located in the receiving groove;

[0017] Preferably, the dimension of the third limiting structure along the direction perpendicular to the substrate is D, 0.5 μm≤D≤8 μm;

[0018] Preferably, 1 μm ≤ D ≤ 5 μm;

[0019] Preferably, the second limiting structure includes a first end close to the third limiting structure, the third limiting structure includes a second end close to the second limiting structure, and a distance between an edge of a side of the first end close to the pixel opening and an edge of a side of the second end close to the pixel opening is L, and L<2 μm;

[0020] Preferably, the minimum distance between the side of the third limiting structure close to the pixel opening and the side away from the pixel opening is S, S<5um;

[0021] Preferably, S<2um;

[0022] Preferably, the material of the third limiting structure includes at least one of polyimide, epoxy resin, acrylic resin, silicone resin, silicon nitride, silicon oxide and fluorine-containing compound;

[0023] Preferably, the fluorine-containing compound is a compound comprising a perfluoromethyl group, a perfluoroethyl group or a perfluorophenyl group, or a derivative of a compound comprising a perfluoromethyl group, a perfluoroethyl group or a perfluorophenyl group;

[0024] Preferably, the material of the third limiting structure is a hydrophobic material.

[0025] According to any of the aforementioned embodiments of the first aspect of the present invention, a portion of the retaining wall structure located between adjacent pixel openings includes a plurality of accommodating openings, and the plurality of accommodating openings are arranged around the pixel openings;

[0026] Preferably, the plurality of accommodating openings are arranged around the pixel openings, and the shape of the orthographic projection of the inner wall of the accommodating opening on the substrate is a circle or a polygon, or the shape of the orthographic projection of the inner wall of the accommodating opening on the substrate is a preset pattern, and the preset pattern includes two first sides that are oppositely arranged and parallel to each other and two second sides that are oppositely arranged and parallel to each other, the first side is a straight line segment, the second side is a curved line segment, and the length direction of the straight line segment is parallel to the arrangement direction of the adjacent pixel openings; preferably, the pixel openings are arranged in an array along the first direction and the second direction, and the plurality of accommodating openings extend respectively along the first direction and are arranged between the adjacent pixel openings along the second direction;

[0027] Preferably, one or more of the plurality of accommodating openings are located between the pixel openings adjacent to each other along the second direction;

[0028] Preferably, the accommodating opening extending along the first direction is arranged through the first direction so that two ends of the accommodating opening respectively exceed the corresponding pixel opening.

[0029] According to any of the aforementioned embodiments of the first aspect of the present invention, the cross-sectional shape of the limiting structure perpendicular to the plane where the substrate is located is an inverted trapezoid;

[0030] Preferably, the base angle of the inverted trapezoid is a, 90°≤a≤150°;

[0031] Alternatively, the cross-sectional shape of the limiting structure perpendicular to the plane where the substrate is located is a regular trapezoid, a triangle or a quadrilateral.

[0032] According to any of the aforementioned embodiments of the first aspect of the present invention, the first functional layer includes a first portion and a second portion that are intermittently arranged, the first portion is located in the pixel opening, and the second portion is located in the receiving opening, and / or the second functional layer includes a third portion and a fourth portion that are intermittently arranged, the third portion is located in the pixel opening, and the fourth portion is located in the receiving opening;

[0033] Preferably, the first functional layer includes at least one of a hole injection layer, a hole transport layer and an electron blocking layer; and the second functional layer includes at least one of a hole blocking layer, an electron transport layer and an electron injection layer.

[0034] According to any of the aforementioned embodiments of the first aspect of the present invention, the cross-sectional shape of the limiting structure perpendicular to the plane where the substrate is located is an inverted trapezoid, the display panel further includes an encapsulation layer, the encapsulation layer includes a plurality of encapsulation sections arranged at intervals, the encapsulation sections are in contact with the side walls of the pixel openings, and the orthographic projections of the encapsulation sections on the substrate cover the orthographic projections of the light-emitting layer on the substrate;

[0035] Preferably, the cross-sectional shape of the limiting structure at right angles to the plane where the substrate is located is an inverted trapezoid, and the display panel also includes a second electrode, which is located on the side of the second functional layer facing away from the substrate, adjacent second electrodes are arranged at intervals, and the orthographic projection of the second electrode on the substrate covers the pixel opening.

[0036] According to any of the aforementioned embodiments of the first aspect of the present invention, the pixel opening is used to expose a partial area of ​​the first electrode, and the orthographic projection of the limiting structure on the substrate covers an edge portion of the orthographic projection of the first electrode on the substrate.

[0037] An embodiment of the second aspect of the present application further provides a display device, comprising any display panel provided by the first aspect of the present application.

[0038] The display panel provided in the present application includes a substrate, a first electrode layer, a first functional layer, a light-emitting layer, a second functional layer and a retaining wall structure, wherein the first electrode layer, the first functional layer, the light-emitting layer and the second functional layer are stacked in a direction away from the substrate. The first electrode layer includes a plurality of first electrodes arranged at intervals. The light-emitting layer includes a plurality of light-emitting structures. The retaining wall structure is formed on a side of the first electrode layer away from the substrate, and includes a limiting structure, a plurality of pixel openings and a plurality of accommodating openings. The plurality of pixel openings accommodate a plurality of light-emitting structures. The accommodating openings are used to accommodate a portion of the first functional layer located between adjacent first electrodes, and a portion of the second functional layer located between adjacent first electrodes, and the first functional layer and the second functional layer in the accommodating openings are in contact with each other. The first functional layer and the second functional layer can be prepared by a wet coating process. During the coating process, the ink falling between adjacent light-emitting structures can be accommodated by the receiving opening to improve the probability of flowing to the side of the two light-emitting structures away from the substrate (i.e., inside the pixel opening), thereby reducing or eliminating the difference in ink flow in different pixel openings, thereby making the film thickness in the pixel opening more uniform, and making the thickness of each area of ​​the display panel more uniform, which helps to improve the display uniformity of the display panel, thereby improving the user experience, and the preparation process is simple and low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 is a partial schematic diagram of a display panel provided in an embodiment of the present application;

[0041] Figure 2 yes Figure 1 Sectional view along P-P';

[0042] Figure 3 yes Figure 1 Another cross-sectional view along the P-P' line;

[0043] Figure 4 yes Figure 1 Another cross-sectional view along the P-P' line;

[0044] Figure 5 yes Figure 1 Another cross-sectional view along the P-P' line;

[0045] Figure 6 is a partial schematic diagram of another display panel provided in an embodiment of the present application;

[0046] Figure 7 is a partial schematic diagram of another display panel provided in an embodiment of the present application;

[0047] Figure 8 is a partial schematic diagram of another display panel provided in an embodiment of the present application;

[0048] Fig. 9 is a partial schematic diagram of another display panel provided in an embodiment of the present application;

[0049] Fig.10 is a partial schematic diagram of another display panel provided in an embodiment of the present application;

[0050] Fig.11 is a partial schematic diagram of another display panel provided in an embodiment of the present application;

[0051] Fig.12 yes Fig.11 A cross-sectional view along the middle line M-M';

[0052] Fig.13 yes Figure 1 Another cross-sectional view along the P-P' line;

[0053] Fig.14 yes Figure 1 Another cross-sectional view along the P-P' line;

[0054] Fig.15 It is a structural schematic diagram of a display device provided in an embodiment of the present application.

[0055] In the attached figure:

[0056] 1-display panel; 10-substrate; 101-groove portion; 111-first electrode; 112-first functional layer; 1120-first part; 1121-second part; 1122-hole injection layer; 1123-hole transport layer; 113-light-emitting layer; 114-second functional layer; 1140-third part; 1141-fourth part; 1142-electron transport layer; 115-second electrode; 12-blocking wall structure; 121-defining structure; 122-pixel opening; 123-accommodating opening; 124-first defining structure; 125-second defining structure; 1251-accommodating groove; 126-third defining structure; 13-encapsulation layer; 131-encapsulation section; 2-display device. DETAILED DESCRIPTION

[0057] The features and exemplary embodiments of various aspects of the application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the application. However, it is obvious to those skilled in the art that the application can be implemented when some details in these specific details are not needed. The following description of the embodiments is only to provide a better understanding of the application by illustrating the example of the application.

[0058] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0059] The inventor has found through research that one preparation process for display panels using quantum dot light-emitting diodes is a wet coating process. However, since the wet coating process is a whole-surface film-forming process, the ink will be spread all over the substrate, and the ink on the pixel-defining layer will flow into the pixel opening. Due to the randomness of the ink flow, the ink volume in the left and right sub-pixels is different, which in turn leads to a difference in film thickness, which has a great impact on the performance of the final device and the uniformity of the display effect of the display panel. Based on the research on the above problems, the inventor provides a display panel and a display device to improve the display uniformity of the display panel.

[0060] In order to better understand this application, Figures 1 to 15 The display panel 1 and the display device 2 according to the embodiments of the present application are described in detail.

[0061] See also Figure 1 and Figure 2 The embodiment of the present application provides a display panel 1, comprising a substrate 10, a first electrode layer, a first functional layer 112, a light-emitting layer, a second functional layer 114 and a retaining wall structure 12. The first electrode layer is located on one side of the substrate 10 and comprises a plurality of first electrodes 111 arranged at intervals. The first functional layer 112, the light-emitting layer and the second functional layer 114 are stacked in a direction away from the substrate 10, and the light-emitting layer comprises a plurality of light-emitting structures 113. The retaining wall structure 12 comprises a limiting structure 121, a plurality of pixel openings 122 arranged in the limiting structure 121 and accommodating the plurality of light-emitting structures 113, and an accommodating opening 123 arranged in the limiting structure 121 and located between adjacent light-emitting structures 113, the accommodating opening 123 being used to accommodate a portion of the first functional layer 112 located between adjacent pixel openings 122 and a portion of the second functional layer 114 located between adjacent pixel openings 122, and the first functional layer 112 in the accommodating opening 123 is in direct contact with the second functional layer 114.

[0062] The display panel 1 provided in the present application includes a substrate 10, a first electrode layer, a first functional layer 112, a light-emitting layer, a second functional layer 114 and a retaining wall structure 12, wherein the first electrode layer, the first functional layer 112, the light-emitting layer and the second functional layer 114 are stacked in a direction away from the substrate. The first electrode layer includes a plurality of first electrodes 111 arranged at intervals. The light-emitting layer includes a plurality of light-emitting structures 113. The retaining wall structure 12 is formed on a side of the first electrode layer away from the substrate 10, and includes a limiting structure 121, a plurality of pixel openings 122 and a plurality of accommodating openings 123. The plurality of pixel openings accommodate the plurality of light-emitting structures 113. The accommodating openings 123 are used to accommodate a portion of the first functional layer 112 located between adjacent first electrodes 111, and a portion of the second functional layer 114 located between adjacent first electrodes 111, and the first functional layer 112 and the second functional layer 114 in the accommodating openings 123 are in contact with each other. The first functional layer 112 and the second functional layer 114 can be prepared by a wet coating process. During the coating process, the ink falling between adjacent light-emitting structures 113 can be accommodated by the accommodating opening 123, which can improve the probability of flowing to the side of the two light-emitting structures 113 away from the substrate 10 (i.e., inside the pixel opening 122), thereby reducing or eliminating the difference in ink flow in different pixel openings 122, thereby making the film thickness in the pixel opening 122 more uniform, and making the thickness of each area of ​​the display panel 1 more uniform, which helps to improve the display uniformity of the display panel 1, thereby improving the user experience, and the preparation process is simple and low-cost.

[0063] In the above embodiment, the pixel opening 122 is used to expose a portion of the first electrode 111 , and the orthographic projection of the limiting structure 121 on the substrate 10 covers the edge portion of the orthographic projection of the first electrode 111 on the substrate 10 .

[0064] The pixel opening 122 is used to expose a portion of the first electrode 111 so as to realize light emission of the light emitting structure 113. The orthographic projection of the limiting structure 121 on the substrate 10 covers the edge portion of the orthographic projection of the first electrode 111 on the substrate 10, so that on the one hand, the mutual insulation of adjacent first electrodes 111 can be realized, and on the other hand, the first electrode 111 can be protected to prevent the edge of the first electrode 111 from being exposed and affecting the performance of the first electrode 111.

[0065] In a possible implementation, Figure 3 As shown, the defining structure 121 includes a first defining structure 124 , and the receiving opening 123 exposes a portion of the substrate 10 between adjacent first electrodes 111 .

[0066] In the above embodiment, the pixel definition layer in the display panel 1 is omitted, and the pixel (light-emitting structure 113) is defined by a definition structure 121. The definition structure 121 includes a layer, and the receiving opening 123 penetrates the definition structure 121 along the thickness direction of the definition structure 121 and exposes the substrate 10, so that the volume of the receiving opening 123 is increased as much as possible under the premise that the size of the definition structure 121 is certain, so as to accommodate more ink. The receiving opening 123 is used to accommodate the first functional layer and / or the second functional layer prepared by the wet coating process, so that the part of the first functional layer and / or the second functional layer located between the adjacent first electrodes 111 is accommodated by the receiving opening 123 to reduce the probability of flow, thereby improving the uniformity of the film thickness in the display panel 1.

[0067] In the above embodiment, the preparation method of the retaining wall structure 12 is simple, and it can be prepared by the conventional preparation process of the display panel 1, and the pixel definition layer is omitted. After being replaced by the retaining wall structure 12, the increase in the number of processes is not large, and low-cost preparation can be achieved.

[0068] In the above embodiment, the minimum distance between the side of the first limiting structure 124 close to the pixel opening 122 and the side away from the pixel opening 122 is S, S < 5um, specifically, S can be 1.5um, 2um, 2.3um, 3.4um, 3.8um, 4.2um, 4.9um, etc., which is not particularly limited in this application. The above size can meet the requirements of the spacing between adjacent light-emitting structures 113 on the one hand, and meet the precision limit of the manufacturing process of the retaining wall structure 12 on the other hand.

[0069] Preferably, S<2um, specifically, S can be 0.5um, 1um, 1.3um, 1.4um, 1.8um, 1.9um, etc., which can reduce the occupancy rate of the area between adjacent light-emitting structures 113 by the retaining wall structure 12, so as to further reduce the spacing between the light-emitting structures 113, thereby increasing the aperture ratio of the display panel 1 and improving the display effect.

[0070] In the above embodiment, the material of the first limiting structure 124 includes at least one of polyimide, epoxy resin, acrylic resin, silicone resin, silicon nitride, silicon oxide and fluorine-containing compounds. Specifically, the fluorine-containing compound is a compound including perfluoromethyl, perfluoroethyl or perfluorophenyl or a derivative of a compound including perfluoromethyl, perfluoroethyl or perfluorophenyl. The above materials are easy to obtain and low in cost, and are suitable for use as the material of the retaining wall structure 12.

[0071] In the above embodiment, the material of the first limiting structure 124 is a hydrophobic material, which can be a perfluoromethyl, perfluoroethyl or perfluorophenyl substitution. The use of a hydrophobic material can reduce the probability of ink residue on the retaining wall structure 12 and improve the uneven film thickness caused by the different amount of ink residue on the side wall of the pixel opening 122.

[0072] In a possible implementation, Figure 4 As shown, the area of ​​the substrate 10 opposite to the accommodating opening 123 also includes a groove portion 101, and the orthographic projection of the limiting structure 121 on the substrate 10 does not overlap with the groove portion 101. The thickness of the groove portion 101 along the direction perpendicular to the substrate 10 is H, 0μm<H≤10μm.

[0073] In the above embodiment, the groove portion 101 is formed by a surface of the substrate 10 facing the retaining wall structure 12 and being recessed toward a surface of the substrate 10 facing away from the retaining wall structure 12. Forming the groove portion 101 on the substrate 10 can further increase the ink capacity of the retaining wall structure 12 for the first functional layer and / or the second functional layer, and reduce the probability of ink overflowing from the receiving opening 123 and flowing into the pixel opening 122, so as to further improve the uniformity of the film layer thickness within the pixel opening 122.

[0074] Specifically, the orthographic projections of the groove portion 101 and the limiting structure 121 on the substrate 10 do not overlap, so that the substrate 10 can provide good support for the retaining wall structure 12, thereby improving the connection stability between the two and avoiding the retaining wall structure 12 being located on the groove portion 101, resulting in a small contact area between the substrate 10 and the retaining wall structure 12 and making the connection between the two unstable.

[0075] Specifically, the thickness H of the groove portion 101 along the direction perpendicular to the substrate 10 can be 0.5 μm, 0.8 μm, 1.0 μm, 1.3 μm, 1.6 μm, 2.4 μm, 2.9 μm, 3.1 μm, 3.5 μm, 3.8 μm, 4.0 μm, 4.5 μm, 5 μm, 7.2 μm, 8.4 μm, 9.6 μm, 10 μm, etc., which is not particularly limited in this application. The above dimensions can be selected to avoid damage to the devices in the substrate 10.

[0076] In a possible implementation, Figure 2 As shown, the limiting structure 121 includes a second limiting structure 125 and a third limiting structure 126 which are stacked in a direction away from the substrate 10, the orthographic projection of the third limiting structure 126 on the substrate 10 is located within the orthographic projection of the second limiting structure 125 on the substrate 10, and the accommodating opening 123 penetrates the third limiting structure 126 in a direction perpendicular to the substrate 10.

[0077] In the above embodiment, the second defining structure 125 may be a pixel definition layer, the third defining structure 126 is located on the side of the second defining structure 125 away from the substrate 10, and the second defining structure 125 and the third defining structure 126 are independent of each other and contact and connect with each other. The receiving opening 123 is only formed in the third defining structure 126. This embodiment can add a layer of the third defining structure 126 without changing the original manufacturing process of the display panel 1, which has little impact on the manufacturing process of the display panel 1 and helps save costs.

[0078] In the above implementation mode, if Figure 5 As shown, the second limiting structure 125 includes a receiving groove 1251, and the third limiting structure 126 is located in the receiving groove 1251, so that the capacity of the retaining wall structure 12 for ink is increased, including the volume of the receiving opening 123 and the volume of the connection position between the receiving groove 1251 and the receiving opening 123, thereby reducing the probability of ink overflowing from the receiving opening 123 and flowing into the pixel opening 122, so as to further improve the uniformity of the film layer thickness inside the pixel opening 122.

[0079] In the above embodiment, the dimension of the third limiting structure 126 along the direction perpendicular to the substrate 10 is D, 0.5μm≤D≤8μm. Specifically, D can be 0.5μm, 0.9μm, 1.1μm, 1.3μm, 1.7μm, 2.4μm, 2.8μm, 3.1μm, 3.3μm, 3.8μm, 4.0μm, 4.3μm, 4.4μm, 4.9μm, 5.0μm, 5.2μm, 5.7μm, 6.0μm, 6.5μm, 7.3μm, 7.5μm, 7.8μm, 8.0μm, etc., and this application does not make any special restrictions. The above dimensions can be selected to ensure that the ink between the light-emitting structures 113 is contained in the containing opening 123, while taking into account the need for thinness of the display panel 1.

[0080] In the above embodiment, D can be further made in the range of 1μm-5μm, that is, 1μm≤D≤5μm; it can be 1μm, 1.1μm, 1.3μm, 1.4μm, 1.5μm, 2.4μm, 2.9μm, 3.1μm, 3.5μm, 3.8μm, 4.1μm, 4.3μm, 4.8μm 5μm, etc., and is not particularly limited in this application.

[0081] In the above embodiment, the second limiting structure 125 includes a first end close to the third limiting structure 126, the third limiting structure 126 includes a second end close to the second limiting structure 125, and the distance between the edge of one side of the first end close to the pixel opening 122 and the edge of one side of the second end close to the pixel opening 122 is L, and L<2μm. Specifically, L can be 0.5μm, 0.8μm, 1.0μm, 1.3μm, 1.6μm, 1.7μm, 1.9μm, etc., and is not particularly limited in this application. By selecting the above-mentioned dimensions, the third limiting structure 126 can be located near the edge of the surface of the side of the second limiting structure 125 facing away from the substrate 10, thereby making the volume of the accommodating opening 123 larger without changing the dimensions between the side of the third limiting structure 126 close to the pixel opening 122 and the side away from the pixel opening 122, while reducing the area of ​​the portion of the second limiting structure 125 that is not blocked by the third limiting structure 126 and the accommodating opening 123, thereby reducing the probability of ink falling here and then flowing into the pixel opening 122, thereby further improving the uniformity of the film thickness.

[0082] In the above embodiment, along the direction parallel to the substrate 10, the minimum distance between the side of the third limiting structure 126 close to the pixel opening 122 and the side away from the pixel opening 122 is S, S < 5um. Specifically, S can be 0.5μm, 0.8μm, 1.0μm, 1.3μm, 1.6μm, 2.4μm, 2.9μm, 3.1μm, 3.5μm, 3.8μm, 4.0μm, 4.2μm, 4.5μm, 4.8μm, etc., and this application does not specifically limit it. The above size can be selected to reduce the volume of the solid part in the third limiting structure 126 under the premise that the manufacturing process accuracy allows, thereby increasing the volume of the accommodating opening 123.

[0083] In the above embodiment, specifically, S<2 μm can be further limited to 0.5 μm, 0.9 μm, 1.1 μm, 1.3 μm, 1.7 μm, 1.8 μm, 1.9 μm, etc., which is not particularly limited in the present application, so as to further increase the volume of the receiving opening 123 .

[0084] In the above embodiment, the material of the third limiting structure 126 includes at least one of polyimide, epoxy resin, acrylic resin, silicone resin, silicon nitride, silicon oxide and fluorine-containing compound. Specifically, the fluorine-containing compound is a compound including perfluoromethyl, perfluoroethyl or perfluorophenyl or a derivative of a compound including perfluoromethyl, perfluoroethyl or perfluorophenyl.

[0085] Specifically, the material of the second limiting structure 125 can be the same as the material of the third limiting structure 126, or the above materials can be selected, which is not particularly limited in this application.

[0086] In the above embodiment, the third limiting structure 126 is made of a hydrophobic material.

[0087] In the above embodiment, the third limiting structure 126 is made of a hydrophobic material, which may be a perfluoromethyl, perfluoroethyl or perfluorophenyl substitution. The use of a hydrophobic material can reduce the probability of ink residue on the limiting structure 121 and improve the uneven film thickness caused by the different amount of ink residue on the side wall of the pixel opening 122.

[0088] In a possible implementation, Figure 6 As shown, the retaining wall structure 12 includes a plurality of accommodating openings 123 , and the plurality of accommodating openings are interconnected.

[0089] In a possible implementation, Figure 7 As shown, the portion of the retaining wall structure 12 located between adjacent pixel openings 122 includes a plurality of receiving openings 123 , and the plurality of receiving openings 123 are arranged around the pixel openings 122 .

[0090] In the above embodiment, by including a plurality of accommodating openings 123 in the portion of the retaining wall structure 12 located between adjacent first electrodes 111, the length of the first functional layer 112 and / or the second functional layer 114 can be increased, thereby increasing the path length of lateral transmission, reducing lateral crosstalk problems, and improving luminescence yield.

[0091] In a possible implementation, Figure 7 As shown, the plurality of receiving openings are arranged around the pixel opening, and the shape of the positive projection of the inner wall of the receiving opening 123 on the substrate 10 is circular or polygonal, or, as shown in FIG. Figure 8 and Fig. 9 As shown, the shape of the orthographic projection of the inner wall of the receiving opening 123 on the substrate is a preset pattern, which includes two first sides that are oppositely arranged and parallel to each other and two second sides that are oppositely arranged and parallel to each other, the first side is a straight line segment, the second side is a curved line segment, and the length direction of the straight line segment is parallel to the arrangement direction of adjacent pixel openings. Specifically, as Figure 8 and Fig. 9 As shown, there are multiple or one receiving opening 123 between adjacent pixel openings 122, which is not particularly limited in the present application.

[0092] In a possible implementation, Fig.10 , Fig.11 and Fig.12 As shown, at least some of the multiple receiving openings 123 in the retaining wall structure 12 are connected to each other.

[0093] In the above embodiment, at least part of the multiple receiving openings 123 are connected to each other so that ink can flow in the receiving openings 123, and ink at a location with more ink can flow to a location with less ink, thereby improving the probability of overflow due to excessive ink at individual locations.

[0094] In a feasible implementation, the pixel openings are arranged in an array along the first direction and the second direction, and the plurality of accommodating openings extend along the first direction respectively and are disposed between adjacent pixel openings along the second direction.

[0095] In a feasible implementation manner, one or more of the plurality of accommodating openings are located between adjacent pixel openings along the second direction.

[0096] In a feasible implementation manner, the accommodating opening extending along the first direction is arranged through the first direction so that both ends of the accommodating opening respectively exceed the corresponding pixel opening.

[0097] In the above embodiment, the accommodating opening extends along the first direction, and the projection of the accommodating opening in the second direction covers the projections of at least two pixel openings in the second direction.

[0098] In a possible implementation, Fig.13 As shown, the cross-sectional shape of the limiting structure 121 at a plane perpendicular to the plane where the substrate 10 is located is an inverted trapezoid, that is, the cross-sectional shape of the limiting structure 121 along the plane perpendicular to the plane where the substrate is located is an inverted trapezoid, thereby improving the probability of ink remaining on the side walls of the receiving opening 123 and the pixel opening 122, and improving the uneven film thickness caused by different residual amounts on the side walls.

[0099] In the above embodiment, the base angle of the inverted trapezoid is a, 90°≤a≤150°; a can be 95°, 100°, 105°, 108°, 110°, 116°, 123°, 135°, 137°, 141°, 143°, 147°, 150°, etc., and is not particularly limited in this application.

[0100] In a possible implementation, Fig.14 As shown, the cross-sectional shape of the limiting structure 121 at a point perpendicular to the plane where the substrate 10 is located is an inverted trapezoid. The display panel 1 also includes an encapsulation layer 13. The encapsulation layer 13 includes a plurality of spaced-apart encapsulation sections 131. The encapsulation sections 131 are in contact with the side walls of the pixel opening 122. The orthographic projection of the encapsulation section 131 on the substrate 10 covers the orthographic projection of the light-emitting structure 113 on the substrate 10.

[0101] The inverted trapezoidal design allows the encapsulation layer 13 to be disconnected to form an encapsulation section 131 . The encapsulation section 131 can realize independent encapsulation of the light emitting structure 113 . The encapsulation section 131 contacts the side wall of the pixel opening 122 , thereby improving encapsulation reliability.

[0102] When the bottom angle of the inverted trapezoid is a, and 90°≤a≤150°, the contact yield between the packaging portion 131 and the side wall of the pixel opening 122 can be improved, and the packaging reliability can be further improved.

[0103] In another feasible embodiment, the cross-sectional shape of the limiting structure 121 perpendicular to the plane where the substrate 10 is located is a regular trapezoid, a triangle or a quadrilateral, which is not particularly limited in this application. The regular shape design has strong reliability and is easy to simulate, so as to simulate the effect of the display panel 1 before the display panel 1 is manufactured.

[0104] In a possible implementation, Fig.13 and Fig.14 As shown, the first functional layer 112 includes a first portion 1120 and a second portion 1121 that are intermittently arranged, the first portion 1120 is located in the pixel opening 122, and the second portion 1121 is located in the accommodating opening 123, and / or the second functional layer 114 includes a third portion 1140 and a fourth portion 1141 that are intermittently arranged, the third portion 1140 is located in the pixel opening 122, and the fourth portion 1141 is located in the accommodating opening 123.

[0105] In the above embodiment, the first functional layer 112 and the second functional layer 114 can be prepared by a wet coating process, or by evaporation. When the first functional layer is prepared by a wet coating process, ink cannot remain on the side wall of the pixel opening 122, the side surface of the retaining wall structure 12 facing away from the substrate 10, and the side wall of the receiving opening 123, so that the first functional layer 112 includes a first portion 1120 and a second portion 1121, wherein the first portion 1120 is located in the pixel opening 122, and the second portion 1121 is located in the receiving opening 123. When the second functional layer is prepared by a wet coating process, ink cannot remain on the side wall of the pixel opening 122, the side surface of the retaining wall structure 12 facing away from the substrate 10, and the side wall of the receiving opening 123, so that the second functional layer 114 includes two parts, a third part 1140 and a fourth part 1141, the third part 1140 is located in the pixel opening 122, and the fourth part 1141 is located in the receiving opening 123.

[0106] In a feasible embodiment, the first functional layer 112 includes at least one of a hole injection layer 1122, a hole transport layer 1123 and an electron blocking layer; the second functional layer 114 includes at least one of a hole blocking layer, an electron transport layer 1142 and an electron injection layer.

[0107] In a possible implementation, Fig.13As shown, the cross-sectional shape of the limiting structure 121 at right angles to the plane where the substrate 10 is located is an inverted trapezoid. The display panel also includes a second electrode 115 , which is located on the side of the second functional layer facing away from the substrate 10 . Adjacent second electrodes 115 are arranged at intervals, and the orthographic projection of the second electrode 115 on the substrate 10 covers the pixel opening 122 .

[0108] In the above embodiment, the retaining wall structure can separate the second electrode 115 layer prepared on the whole surface into a plurality of second electrodes 115 separated from each other, so that different light-emitting structures 113 can be controlled separately, and the light output brightness of the light-emitting structures 113 in different areas can be adjusted according to different brightness requirements of different areas, thereby reducing power consumption. And improve the problem of different display brightness in different areas of the display panel 1 caused by IR-drop.

[0109] In a specific embodiment, Figure 2 As shown, the first electrode 111 may be an anode, the second electrode 115 may be a cathode, and the first functional layer 112 may include a hole injection layer 1122 and a hole transport layer 1123 stacked in a direction away from the substrate 10. The second functional layer 114 may include an electron transport layer 1142, and the light-emitting layer may be a quantum dot light-emitting layer.

[0110] At this time, the hole injection layer 1122, the hole transport layer 1123, the quantum dot light-emitting layer and the electron transport layer 1142 can all be prepared by a wet coating process, so the above-mentioned film layers all include a portion located in the pixel opening 122 and a portion located in the receiving opening 123, and the portion located in the pixel opening 122 and the portion located in the receiving opening 123 are discontinuous, and the side surface of the retaining wall structure 12 and the side surface facing away from the substrate 10 do not form the above-mentioned film layers. The second electrode 115 can be continuously arranged on the entire surface, or independently of each other, and this application does not specifically limit it.

[0111] The quantum dot light-emitting layer located in the receiving opening can be removed through a process.

[0112] In another specific embodiment, Figure 3 As shown, the first electrode 111 may be a cathode, the second electrode 115 may be an anode, and the first functional layer 112 may include an electron transport layer 1142. The second functional layer 114 may include a hole transport layer 1123 and a hole injection layer 1122 stacked in a direction away from the substrate 10, and the light-emitting layer may be a quantum dot light-emitting layer.

[0113] At this time, the electron transport layer 1142 and the quantum dot light-emitting layer can be prepared by a wet coating process, so the above-mentioned film layers all include a portion located in the pixel opening 122 and a portion located in the receiving opening 123, and the portion located in the pixel opening 122 and the portion located in the receiving opening 123 are discontinuous, and the side surface of the retaining wall structure 12 and the side surface facing away from the substrate 10 do not form the above-mentioned film layer. The hole transport layer 1123 and the hole injection layer 1122 can be prepared by an evaporation process, so they can be continuously arranged on the entire surface. The second electrode 115 can be continuously arranged on the entire surface, or independently of each other, and this application does not make any special restrictions.

[0114] The present application also provides a display device 2, such as Fig.15 As shown, it includes any one of the display panels 1 provided in the above embodiments of the present application.

[0115] The present application also provides a display device 2, comprising any display panel 1 provided in the present application.

[0116] Since the display device 2 provided in the present application includes any one of the display panels 1 provided in the above embodiments, the display device 2 provided in the present application has the beneficial effects of any one of the display panels 1 provided in the above embodiments, which will not be described in detail herein.

[0117] The display device 2 in the embodiment of the present application includes but is not limited to mobile phones, personal digital assistants (PDA), tablet computers, e-books, televisions, access control systems, smart landline phones, consoles and other devices with display functions.

[0118] According to the embodiments of the present application as above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The present application is only limited by the claims and their full scope and equivalents.

Claims

1. A display panel, characterized in that: include: substrate; A first electrode layer, located on one side of the substrate and comprising a plurality of first electrodes arranged at intervals; A first functional layer, a light-emitting layer, and a second functional layer are stacked in a direction away from the substrate, the light-emitting layer comprising a plurality of light-emitting structures; a retaining wall structure comprising a limiting structure, a plurality of pixel openings provided in the limiting structure and accommodating the plurality of light-emitting structures, and an accommodating opening provided in the limiting structure and located between adjacent light-emitting structures, the accommodating opening being used to accommodate a portion of the first functional layer located between adjacent pixel openings and a portion of the second functional layer located between adjacent pixel openings, and the first functional layer located in the accommodating opening is in direct contact with the second functional layer.

2. The display panel according to claim 1, characterized in that: The limiting structure includes a first limiting structure, and the receiving opening exposes a partial area of ​​the substrate located between adjacent first electrodes; Preferably, along a direction parallel to the substrate, a minimum distance between a side of the first limiting structure close to the pixel opening and a side away from the pixel opening is S, and S is less than 5 um; Preferably, S<2um; Preferably, the material of the first limiting structure includes at least one of polyimide, epoxy resin, acrylic resin, silicone resin, silicon nitride, silicon oxide and fluorine-containing compounds; Preferably, the fluorine-containing compound is a compound comprising a perfluoromethyl group, a perfluoroethyl group or a perfluorophenyl group, or a derivative of a compound comprising a perfluoromethyl group, a perfluoroethyl group or a perfluorophenyl group; Preferably, the material of the first limiting structure is a hydrophobic material.

3. The display panel according to claim 2, characterized in that: The area of ​​the substrate opposite to the receiving opening further includes a groove portion, the orthographic projection of the limiting structure on the substrate has no overlap with the groove portion, and the thickness of the groove portion along a direction perpendicular to the substrate is H, 0μm<H≤10μm.

4. The display panel according to claim 1, characterized in that: The limiting structure comprises a second limiting structure and a third limiting structure stacked in a direction away from the substrate, the orthographic projection of the third limiting structure on the substrate is located within the orthographic projection of the second limiting structure on the substrate, and the receiving opening penetrates the third limiting structure in a direction perpendicular to the substrate; Preferably, the second limiting structure comprises a receiving groove, and the third limiting structure is located in the receiving groove; Preferably, the dimension of the third limiting structure along the direction perpendicular to the substrate is D, 0.5 μm≤D≤8 μm; Preferably, 1 μm ≤ D ≤ 5 μm; Preferably, the second limiting structure includes a first end close to the third limiting structure, the third limiting structure includes a second end close to the second limiting structure, and a distance between an edge of a side of the first end close to the pixel opening and an edge of a side of the second end close to the pixel opening is L, and L<2 μm; Preferably, the minimum distance between a side of the third limiting structure close to the pixel opening and a side away from the pixel opening is S, S<5um; Preferably, S<2um; Preferably, the material of the third limiting structure includes at least one of polyimide, epoxy resin, acrylic resin, silicone resin, silicon nitride, silicon oxide and fluorine-containing compound; Preferably, the fluorine-containing compound is a compound comprising a perfluoromethyl group, a perfluoroethyl group or a perfluorophenyl group, or a derivative of a compound comprising a perfluoromethyl group, a perfluoroethyl group or a perfluorophenyl group; Preferably, the material of the third limiting structure is a hydrophobic material.

5. The display panel according to claim 1, characterized in that: The portion of the retaining wall structure located between the adjacent pixel openings includes a plurality of the accommodating openings, and the plurality of the accommodating openings are arranged around the pixel openings; Preferably, the plurality of accommodating openings are arranged around the pixel openings, and the shape of the orthographic projection of the inner wall of the accommodating opening on the substrate is a circle or a polygon, or the shape of the orthographic projection of the inner wall of the accommodating opening on the substrate is a preset pattern, and the preset pattern includes two first sides that are oppositely arranged and parallel to each other and two second sides that are oppositely arranged and parallel to each other, the first side is a straight line segment, the second side is a curved line segment, and the length direction of the straight line segment is parallel to the arrangement direction of the adjacent pixel openings; preferably, the pixel openings are arranged in an array along the first direction and the second direction, and the plurality of accommodating openings extend respectively along the first direction and are arranged between the adjacent pixel openings along the second direction; Preferably, one or more of the plurality of accommodating openings are located between the pixel openings adjacent to each other along the second direction; Preferably, the accommodating opening extending along the first direction is arranged through the first direction so that two ends of the accommodating opening respectively exceed the corresponding pixel opening.

6. The display panel according to claim 1, characterized in that: The cross-sectional shape of the limiting structure perpendicular to the plane where the substrate is located is an inverted trapezoid; Preferably, the base angle of the inverted trapezoid is a, 90°≤a≤150°; Alternatively, the cross-sectional shape of the limiting structure perpendicular to the plane where the substrate is located is a regular trapezoid, a triangle or a quadrilateral.

7. The display panel according to claim 1, characterized in that: The first functional layer comprises a first portion and a second portion which are intermittently arranged, wherein the first portion is located in the pixel opening and the second portion is located in the receiving opening, and / or the second functional layer comprises a third portion and a fourth portion which are intermittently arranged, wherein the third portion is located in the pixel opening and the fourth portion is located in the receiving opening; Preferably, the first functional layer includes at least one of a hole injection layer, a hole transport layer and an electron blocking layer; and the second functional layer includes at least one of a hole blocking layer, an electron transport layer and an electron injection layer.

8. The display panel according to claim 1, characterized in that: The cross-sectional shape of the limiting structure perpendicular to the plane where the substrate is located is an inverted trapezoid, the display panel further includes an encapsulation layer, the encapsulation layer includes a plurality of encapsulation sections arranged at intervals, the encapsulation sections are in contact with the side walls of the pixel openings, and the orthographic projection of the encapsulation sections on the substrate covers the orthographic projection of the light-emitting layer on the substrate; Preferably, the cross-sectional shape of the limiting structure at right angles to the plane where the substrate is located is an inverted trapezoid, and the display panel also includes a second electrode, which is located on the side of the second functional layer facing away from the substrate, adjacent second electrodes are arranged at intervals, and the orthographic projection of the second electrode on the substrate covers the pixel opening.

9. The display panel according to claim 1, characterized in that: The pixel opening is used to expose a partial area of ​​the first electrode, and the orthographic projection of the limiting structure on the substrate covers an edge portion of the orthographic projection of the first electrode on the substrate.

10. A display device, characterized in that: Comprising a display panel as described in any one of claims 1 to 9.

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