Display panel and display device

Abstract

The invention relates to the technical field of display, and particularly provides a display panel and a display device.The display panel comprises a substrate, a pixel definition layer and a light-emitting functional layer, the light-emitting functional layer is arranged on one side of the substrate and provided with a pixel opening, and the side, facing the pixel opening, of the pixel definition layer is an opening side wall; the light-emitting functional layer covers the pixel openings, and the side walls of the openings are provided with protrusions and / or recesses. According to the display panel, the opening side walls of the pixel openings are provided with the protrusions and / or the recesses, so that the connection firmness of the pixel definition layer and other film layers located in the pixel openings is improved, the probability of poor stripping at the pixel openings is reduced, water and oxygen erosion caused by stripping of the film layers at the pixel openings of the display panel is effectively reduced, and the display quality is improved. Therefore, the display effect of the display panel is not influenced, and the use performance of the display panel is improved.

Description

Technical Field

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

[0002] Organic Light Emitting Diode (OLED) and flat-panel display devices based on technologies such as OLED have the advantages of high image quality, power saving, thin body and wide application range, and are widely used in various consumer electronic products such as mobile phones, televisions, laptops, desktop computers, etc., becoming the mainstream in display devices.

[0003] However, the performance of current OLED display products needs to be improved. Summary of the invention

[0004] The present application provides a display panel and a display device to improve the performance of the display panel at least to a certain extent.

[0005] To achieve the above-mentioned objectives, the technical solution adopted in the present application is: in the first aspect, a display panel is provided, including: a substrate, a pixel definition layer and a light-emitting functional layer, the pixel definition layer is provided with a pixel opening, the side of the pixel definition layer facing the pixel opening is an opening sidewall, the light-emitting functional layer covers the pixel opening, and the opening sidewall is provided with protrusions and / or depressions.

[0006] In the display panel provided in the embodiment of the present application, by setting the opening side wall of the pixel opening as an uneven surface, the connection strength between the pixel definition layer and other film layers located in the pixel opening can be improved, so that other film layers connected to the pixel definition layer through the opening side wall need to overcome a larger peeling force to be peeled off from the pixel definition layer, thereby reducing the probability of poor peeling at the pixel opening, helping to improve the reliability of the display panel, and effectively reducing the possibility of water and oxygen erosion of the display panel due to film layer peeling at the pixel opening, thereby affecting the display effect of the display panel.

[0007] Optionally, a concave-convex structure is provided on the side wall of the opening.

[0008] Optionally, the concavo-convex structure is a burr or a wave structure.

[0009] Optionally, a step pointing toward the pixel opening is provided on the side wall of the opening.

[0010] Optionally, the opening side wall includes a first edge close to the substrate and a second edge facing away from the substrate, and the step is provided between the first edge and the second edge.

[0011] Optionally, in a cross section along the thickness direction of the substrate, an angle between a line connecting the first edge and the second edge and a plane where the substrate is located is between 30° and 75°.

[0012] Optionally, the step comprises a third edge, the third edge is located between the first edge and the second edge, and the orthographic projection of the third edge on the substrate is located between the orthographic projection of the first edge on the substrate and the orthographic projection of the second edge on the substrate.

[0013] Optionally, the step further includes a first connecting wall and a second connecting wall, and the third edge is located at the intersection of the first connecting wall and the second connecting wall;

[0014] The first connecting wall of the step is connected to the first edge, and the second connecting wall is connected to the second edge.

[0015] Optionally, the number of the steps is at least two, and all the steps are arranged in sequence and spaced apart in a direction away from the base.

[0016] Optionally, along the thickness direction of the substrate, of any two adjacent steps, the step close to the second edge is located on a side of the step close to the first edge away from the pixel opening.

[0017] Optionally, the pixel definition layer comprises a multi-layer structure.

[0018] Optionally, the display panel further includes a light-emitting functional layer, and the light-emitting functional layer at least partially covers the side wall of the opening and is connected to the pixel definition layer.

[0019] Optionally, the display panel further comprises an isolation structure, the isolation structure is located on a side of the pixel definition layer facing away from the substrate, an isolation opening is provided on the isolation structure, and the pixel opening is arranged corresponding to the isolation opening and communicated with the isolation opening;

[0020] The orthographic projection of the pixel opening on the substrate is located within the orthographic projection range of the isolation opening on the substrate.

[0021] Optionally, a portion of the light-emitting functional layer in the circumferential direction is connected to the isolation structure.

[0022] Optionally, the isolation structure includes a root portion, a support portion and a crown portion, wherein the support portion is located on a side of the root portion facing away from the base, and the crown portion is located on a side of the support portion facing away from the root portion; the crown portion extends outwardly along a side wall of the support portion.

[0023] Optionally, a circumferential portion of the light-emitting functional layer is connected to the root.

[0024] Optionally, the display panel further includes a first electrode layer and a second electrode layer, and the first electrode layer, the light-emitting functional layer and the second electrode layer are sequentially stacked on the substrate;

[0025] The first electrode layer is located between the substrate and the pixel definition layer, and a portion of the first electrode layer is exposed through the pixel opening and connected to the light-emitting functional layer;

[0026] The second electrode layer is located on a side of the light-emitting functional layer facing away from the substrate and overlaps the isolation structure;

[0027] The second electrode layer also includes a packaging layer, and the second electrode layer and the packaging layer located above the pixel opening (201) have the same morphology as the pixel opening.

[0028] In a second aspect, the present application further provides a display device, comprising any of the display panels described above.

[0029] The display device provided in the embodiment of the present application includes the above-mentioned display panel, so the display device at least includes the beneficial effects of any one or several of the above-mentioned display panels. The specific effects are described above and will not be repeated here.

[0030] The display panel and display device provided by the present application have the following beneficial effects: compared with the related art, the display panel provided by the present application can improve the connection firmness between the pixel definition layer and other film layers located in the pixel opening by having a raised and / or recessed opening sidewall, effectively reduce the probability of poor peeling at the pixel opening, and improve the reliability of the display panel. In addition, under the premise that the pixel definition layer is firmly connected to the relevant film layer, the probability of water and oxygen invading the display panel through the pixel definition layer can be reduced, and the pixel dark spot failure of the display panel due to water and oxygen erosion can be avoided, so as to help improve the display effect and performance of the display panel. The structure can also improve the durability of the display panel to a certain extent, so that the display panel has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art 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 paying creative labor.

[0032] Figure 1 A schematic diagram of the planar structure of a display panel provided in an embodiment of the present application;

[0033] Figure 2 for Figure 1 The structure of the S1 region in the display panel is shown as an enlarged view;

[0034] Figure 3 for Figure 2 A cross-sectional view of the display panel taken along the line AA in a certain embodiment;

[0035] Figure 4 for Figure 2 The display panel is shown in an AA cross-sectional view in another embodiment;

[0036] Figure 5 for Figure 4 A magnified view of the structure of region B in FIG.

[0037] Figure 6 A schematic diagram of the planar structure of a display device provided in an embodiment of the present application.

[0038] Among them, the reference numerals in the figure are:

[0039] 1. substrate; 2. pixel definition layer; 201. pixel opening; 21. opening side wall; 2101. first edge; 2102. second edge; 22. concave-convex structure; 23. step; 231. third edge; 232. first connecting wall; 233. second connecting wall; 3. light-emitting functional layer; 4. isolation structure; 401. isolation opening; 41. root; 42. support part; 43. crown; 5. first electrode layer; 6. second electrode layer; 7. encapsulation layer; 71. first encapsulation part; 72. second encapsulation part; 73. third encapsulation part;

[0040] 10. Display panel;

[0041] 100. Display device. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] The term "layer" used in the text may refer to a material portion including an area with a certain thickness. A layer may extend over the entire underlying structure or overlying structure, or may have a range smaller than the range of the underlying or overlying structure. In addition, a layer may be an area of ​​a homogeneous or inhomogeneous continuous structure, the thickness of which is less than the thickness of the continuous structure. For example, a layer may be located between the top surface and the bottom surface of the continuous structure or between any paired lateral planes at the top surface and the bottom surface. A layer may extend laterally, vertically and / or along a tapered surface. A substrate may be a layer, may include one or more layers therein, and / or may have one or more layers located thereon, above it and / or below it. A layer may include multiple layers. For example, an interconnect layer may include one or more conductors and a contact layer (forming contacts, interconnects and / or vias therein) and one or more dielectric layers.

[0050] The display panel 10 is provided with an isolation structure 4, which can be used to isolate some functional film layers in adjacent light-emitting units (also referred to as light-emitting devices), ensuring that adjacent light-emitting units do not interfere with each other, and helping to improve the display effect of the display panel 10. However, it is found in the related art that some light-emitting units have dark spot failures, which to some extent affect the display effect of the display panel 10 and ultimately affect its performance.

[0051] Based on this, an embodiment of the present application provides a display panel 10 to alleviate or improve the above technical problems at least to a certain extent.

[0052] The present application provides a display panel 10 and a display device 100 to improve the performance of the display panel 10 at least to a certain extent, so that the display panel 10 has a better display effect and a better service life.

[0053] The display panel 10 includes a substrate 1 and a pixel definition layer 2 located on the substrate 1, wherein a pixel opening 201 is provided on the pixel definition layer 2, and the pixel opening 201 is arranged through two surfaces of the pixel definition layer 2 in the thickness direction. An opening side wall 21 is formed on the side of the pixel definition layer 2 facing the pixel opening 201, and the opening side wall 21 is provided with protrusions and / or depressions, wherein the protrusions and / or depressions refer to rough surface, rough surface, uneven surface, ups and downs, waves, or stepped protrusions on the surface, etc.

[0054] The above-mentioned opening side wall 21 can enclose the above-mentioned pixel opening 201. In the display panel 10 provided in the embodiment of the present application, by setting the opening side wall 21 of the pixel opening 201 with a protrusion and / or a depression, the connection firmness between the pixel definition layer 2 and other film layers located in the pixel opening 201 can be improved, so that other film layers connected to the pixel definition layer 2 through the opening side wall 21 need to overcome a greater peeling force to be peeled off from the pixel definition layer 2, reducing the probability of poor peeling at the pixel opening 201, helping to improve the reliability of the display panel 10, and effectively reducing the failure of the display panel 10 due to the peeling of the film layer at the pixel opening 201 that affects its packaging effect. In addition, by reducing the occurrence of poor film peeling at the pixel opening 201 of the display panel 10, it is also possible to further reduce the possibility that water oxygen invades the display panel through the gaps caused by peeling at the pixel opening 201 and corrodes the related light-emitting units, causing display failures in the display panel 10, thereby affecting the display effect of the display panel 10. This technical solution helps to improve the performance of the display panel.

[0055] Specifically, the pixel definition layer 2 can be in contact with and connected to other adjacent partial film layers through the above-mentioned opening side wall 21. By roughening the above-mentioned opening side wall 21, the bonding force between the pixel definition layer 2 and the adjacent film layer at the pixel opening 201 can be effectively improved, thereby making the connection between the two more firm and less likely to peel off, thereby avoiding poor peeling between the film layer in contact with the pixel definition layer 2 through the pixel opening 201 and the pixel definition layer 2.

[0056] The above structure can effectively improve the reliability and service life of the display panel 10 , and reduce the probability of pixel dark spots in the display panel 10 to a certain extent, thereby improving the display effect of the display panel 10 .

[0057] In some embodiments, see Figure 1-Figure 3 The display panel 10 further includes a light-emitting functional layer 3 , which is located on the side of the pixel definition layer 2 facing away from the substrate 1 , and the orthographic projection of the light-emitting functional layer 3 on the substrate 1 partially overlaps with the orthographic projection of the pixel opening 201 on the substrate 1 .

[0058] See also Figure 3-Figure 4The light-emitting functional layer 3 is connected to the pixel definition layer 2 through the opening side wall 21 .

[0059] Specifically, part of the sidewall of the light-emitting functional layer 3 in the circumferential direction is in contact with the opening sidewall 21 of the pixel opening 201. At this time, the pixel definition layer 2 can be connected to the light-emitting functional layer 3 through the roughened opening sidewall 21 to improve the bonding force between the two, so that the two are not easily peeled off, thereby effectively preventing the pixel definition layer 2 and the light-emitting functional layer 3 from peeling off poorly, and improving the reliability of the display panel 10.

[0060] In some embodiments, compared with a traditional smooth sidewall structure, the design of roughening the opening sidewall 21 can increase the contact area between the pixel definition layer 2 and the light-emitting function layer 3 without changing the size of the pixel opening 201, the thickness of the pixel definition layer 2 and the thickness of the light-emitting function layer 3, thereby improving the bonding force between the pixel definition layer 2 and the light-emitting function layer 3, thereby increasing the peeling force required for the light-emitting function layer 3 to peel off the pixel definition layer 2, and reducing the possibility of mutual peeling between the two.

[0061] It can be understood that the greater the peeling force of the light-emitting functional layer 3 is, the more difficult it is to peel off the light-emitting functional layer 3 .

[0062] In order to enable the light-emitting functional layer 3 to work normally under power-on conditions, the display panel 10 further includes a first electrode layer 5 and a second electrode layer 6 .

[0063] See also Figure 3 and Figure 4 The first electrode layer 5, the light-emitting functional layer 3 and the second electrode layer 6 are stacked on the substrate 1 in sequence, wherein the first electrode layer 5 is located between the substrate 1 and the pixel definition layer 2, a portion of the first electrode layer 5 is exposed through the pixel opening 201 and connected to the light-emitting functional layer 3, and the second electrode layer 6 is located on the side of the light-emitting functional layer 3 facing away from the substrate 1.

[0064] The orthographic projection of the first electrode layer 5 on the substrate 1 partially overlaps with the orthographic projection of the pixel opening 201 on the substrate 1. The light-emitting functional layer 3 covers at least a portion of the pixel opening 201, and passes through the pixel opening 201 to contact the first electrode layer 5 located between the pixel definition layer 2 and the substrate 1. The second electrode layer 6 covers the surface of the light-emitting functional layer 3 on the side facing away from the substrate 1.

[0065] Specifically, the first electrode layer 5 can be an anode layer, and correspondingly, the second electrode layer 6 can be a cathode layer. Of course, in other embodiments, the first electrode layer 5 can be a cathode layer, and the second electrode layer 6 can be an anode layer.

[0066] The stacked first electrode layer 5 , the light-emitting functional layer 3 and the second electrode layer 6 can cooperate with each other and emit light when powered on.

[0067] In this embodiment or other similar embodiments, the light-emitting functional layer 3 fails to cover the entire sidewall 21 of the pixel opening 201 . In this case, a circumferential portion of the second electrode layer 6 can contact a portion of the sidewall 21 of the pixel opening 201 .

[0068] The pixel definition layer 2 can be connected to the second electrode layer 6 through the roughened opening side wall 21 to improve the bonding force between the pixel definition layer 2 and the second electrode layer 6, making it difficult for the two to peel off, thereby effectively preventing peeling defects between the pixel definition layer 2 and the second electrode layer 6 and improving the reliability of the display panel 10.

[0069] The contents of the isolation structure 4 mentioned below are disclosed in patents CN118251982A, patent 202410864269.8, PCT / CN2024 / 098407, PCT / CN2024 / 102783, PCT / CN2024 / 098217, PCT / CN2024 / 099419, PCT / CN2024 / 099072, and C Further description is provided in N117979755A, CN117998900A, CN117062489A, CN117580403A, CN116583155A, CN116669477A, ​​CN117396039A, CN116669480A, CN116600606A, and CN117500332A for reference.

[0070] See also Figure 3 In some embodiments, the display panel 10 further includes an isolation structure 4, wherein the isolation structure 4 is located on the side of the pixel definition layer 2 facing away from the substrate 1, an isolation opening 401 is provided on the isolation structure 4, and the pixel opening 201 is correspondingly arranged with the isolation opening 401 and communicated with the isolation opening 401. The orthographic projection of the pixel opening 201 on the substrate 1 is within the orthographic projection range of the isolation opening 401 on the substrate 1.

[0071] The light-emitting functional layer 3 is located in the isolation opening 401, and the portion of the light-emitting functional layer 3 extending relative to the pixel opening 201 can be connected to the isolation structure 4. In other words, the portion of the light-emitting functional layer 3 in the circumferential direction is connected to the isolation structure 4, but it can also be disconnected, which can better prevent the occurrence of leakage, and the details are not limited here.

[0072] At least a portion of the second electrode layer 6 located on the side of the light-emitting functional layer 3 facing away from the substrate 1 in the circumferential direction can overlap with the isolation structure 4 .

[0073] In some embodiments, the display panel 10 further includes an encapsulation layer 7, which is located on the side of the light-emitting functional layer 3 facing away from the substrate 1. At least a portion of the encapsulation layer 7 is located in the isolation opening 401 and can cover the light-emitting functional layer 3.

[0074] Specifically, the encapsulation layer 7 is located on the side of the second electrode layer 6 facing away from the substrate 1 , and at least a portion of the encapsulation layer 7 is located in the isolation opening 401 and can cover the second electrode layer 6 .

[0075] During the reliability test, the encapsulation layer 7 may expand or contract due to the increase or decrease in temperature. In the process of deformation of the encapsulation layer 7, the encapsulation layer 7 will be limited by the isolation opening 401 and generate certain stress. The stress will be released under certain conditions. At this time, at least one of the light-emitting functional layer 3 and the second electrode layer 6 may be affected by the above-mentioned stress and produce a peeling defect between the opening side wall 21 of the pixel definition layer 2, thereby making it easier for external water and oxygen to invade the display panel 10 and affect its service life, and even produce pixel dark spot defects. In the embodiment of the present application, by roughening the opening side wall 21, the bonding force between any one of the light-emitting functional layer 3 and the second electrode layer 6 and the isolation opening 401 can be effectively improved, thereby increasing the peeling force required for any one of the light-emitting functional layer 3 and the second electrode layer 6 to peel off the pixel definition layer 2, and reducing the possibility of mutual peeling between connected film layers.

[0076] Therefore, the above design can effectively prevent any one of the light-emitting functional layer 3 and the second electrode layer 6 from peeling off relative to the pixel definition layer 2 .

[0077] In this embodiment or other similar embodiments, the light-emitting functional layer 3 and the second electrode layer 6 fail to cover the entire opening side wall 21 of the pixel opening 201. At this time, the encapsulation layer 7 is located in the isolation opening 401 and the partial film layer covering the second electrode layer 6 can contact the partial opening side wall 21 formed in the pixel opening 201.

[0078] The pixel definition layer 2 can be connected to the encapsulation layer 7 through the roughened opening side wall 21 to improve the bonding force between the pixel definition layer 2 and the encapsulation layer 7, making it difficult for the two to peel off, thereby effectively preventing peeling defects between the pixel definition layer 2 and the encapsulation layer 7 and improving the reliability of the display panel 10.

[0079] In some embodiments, the roughened opening sidewall 21 may be prepared by etching, or may be formed by ion bombardment or other methods.

[0080] Specifically, the roughened opening sidewall 21 may have a concave-convex shape.

[0081] See also Figure 3The above-mentioned opening sidewall 21 is provided with a concavo-convex structure 22, which can make the opening sidewall 21 present an uneven and rough state. At this time, the roughened opening sidewall 21 can increase the contact area between the opening sidewall 21 and the light-emitting functional layer 3 through a plurality of concavo-convex structures 22 protruding toward the pixel opening 201, thereby improving the bonding force between the two and reducing the possibility of film peeling defects between the pixel definition layer 2 and the light-emitting functional layer 3.

[0082] Specifically, the number of the concave-convex structure 22 can be one or more. When the number of the concave-convex structure 22 is more than one, the multiple concave-convex structures 22 can be arranged at intervals along the thickness direction of the pixel definition layer 2 and / or arranged at intervals along the circumference of the pixel opening 201.

[0083] Specifically, the concavo-convex structures 22 are distributed at different positions of the opening sidewall 21 to further enhance the bonding force between the pixel definition layer 2 and other adjacent film layers connected through the opening sidewall 21 .

[0084] The concavo-convex structure 22 can be formed by chemical erosion or physical treatment.

[0085] In other similar embodiments, the opening sidewall 21 may be provided with a step 23 pointing to the pixel opening 201, see Figure 4 The step 23 can make the opening side wall 21 present an uneven and rough state.

[0086] The roughened opening side wall 21 can increase the contact area between the opening side wall 21 and other adjacent film layers connected through the opening side wall 21 by having a number of steps 23 protruding toward the pixel opening 201, thereby improving the bonding strength between the two and reducing the possibility of film peeling defects between the pixel definition layer 2 and either the light-emitting functional layer 3 or the second electrode layer 6.

[0087] Specifically, the step 23 may also be referred to as a "Taper angle", which is formed in an area where the shape of a structure gradually becomes thinner or sharper. From the perspective of the cross-section of the structure, if the cross-sectional area along a certain direction gradually decreases, a Taper angle may exist in that direction. The step 23 can make the surface structure of the opening side wall 21 complex and changeable, and form a relatively rough surface.

[0088] See also Figure 5 The opening sidewall 21 includes a first edge 2101 close to the substrate 1 and a second edge 2102 facing away from the substrate 1 . The step 23 is disposed between the first edge 2101 and the second edge 2102 and points to the pixel opening 201 .

[0089] The opening sidewall 21 having the first edge 2101 and the second edge 2102 is a slope surface arranged obliquely relative to the plane where the substrate 1 is located, and the end away from the substrate 1 is inclined toward a direction away from the pixel opening 201 .

[0090] Specifically, in the cross section along the thickness direction of the substrate 1, the angle between the line connecting the first edge 2101 and the second edge 2102 and the plane where the substrate 1 is located is between 30° and 75°, and the specific numerical range can be adjusted according to actual needs. For example, the angle can be any value of 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, etc.

[0091] In some embodiments, the cross-section of the opening sidewall 21 formed by the plurality of steps 23 is similar to a step-shaped structure.

[0092] See also Figure 5 The step 23 points to one end of the pixel opening 201 to form a third edge 231, and the third edge 231 is located between the first edge 2101 and the second edge 2102. The third edge 231 here is arc-shaped in the actual process, and the figure is only an example.

[0093] In some embodiments, the orthographic projection of the third edge 231 on the substrate 1 is located between the orthographic projection of the first edge 2101 on the substrate 1 and the orthographic projection of the second edge 2102 on the substrate 1 .

[0094] Alternatively, in other embodiments, the orthographic projection of the third edge 231 on the substrate 1 may be arranged to be located on the side of the orthographic projection of the first edge 2101 on the substrate 1 toward the middle of the pixel opening 201 , and in this case, the third edge 231 is closer to the middle of the pixel opening 201 than the first edge 2101 .

[0095] It should be noted that the number of the third edges 231 is the same as the number of the steps 23 and they are arranged in a one-to-one correspondence.

[0096] See also Figure 5 The step 23 further includes a first connecting wall 232 and a second connecting wall 233, and the third edge 231 is located at the intersection of the first connecting wall 232 and the second connecting wall 233. The first connecting wall 232, the second connecting wall 233 and the third edge 231 cooperate to form a step 23 structure located on the surface of the opening side wall 21.

[0097] The number of the steps 23 may be one, two or more.

[0098] When the number of the step 23 is one, the step 23 can be connected to the first edge 2101 of the opening side wall 21 through the first connecting wall 232, and connected to the second edge 2102 of the opening side wall 21 through the second connecting wall 233. In other words, the end of the first connecting wall 232 facing away from the third edge 231 forms the first edge 2101, and the end of the second connecting wall 233 facing away from the third edge 231 forms the second edge 2102.

[0099] In some embodiments, the number of steps 23 is at least two, and all the steps 23 are arranged in sequence and spaced apart in a direction away from the substrate 1. At this time, any two adjacent steps 23 can be connected by a second connecting wall 233 and a first connecting wall 232 connected in sequence. At least a portion of the opening sidewall 21 presents a segmented multi-Taper angle design, for example: the pixel definition layer 2 includes a multi-layer structure, and there is a deviation between the layers during etching, resulting in a step difference or a step, and the multi-layer structure can be the same material or different materials.

[0100] When there are two steps 23, the step 23 close to the substrate 1 can be connected to the first edge 2101 of the opening side wall 21 through the first connecting wall 232, and the step 23 facing away from the substrate 1 can be connected to the second edge 2102 of the opening side wall 21 through the second connecting wall 233. Two adjacent steps 23 are respectively connected to the first connecting wall 232 through the corresponding second connecting wall 233, and a relatively sharp angle can be formed between the second connecting wall 233 and the first connecting wall 232 to further improve the roughness of the opening side wall 21. Of course, the adjacent second connecting walls 233 and first connecting walls 232 can also be connected through a relatively smooth curved surface.

[0101] When the number of the above steps 23 is three, please refer to Figure 5 At this time, the step 23 located in the middle is connected to the second connecting wall 233 and the first connecting wall 232 of the other two steps 23 through the first connecting wall 232 and the second connecting wall 233 respectively.

[0102] Specifically, the steps 23 are distributed at different positions of the opening sidewall 21 to further improve the bonding force between the pixel definition layer 2 and the adjacent film layer.

[0103] When the number of the steps 23 is at least two, of any two adjacent steps 23 , the step 23 close to the second edge 2102 along the thickness direction of the substrate 1 is located on the side of the step 23 close to the first edge 2101 away from the pixel opening 201 .

[0104] See also Figure 4 and Figure 5The opening side wall 21 formed around the pixel opening 201 is an inclined slope in the cross-sectional direction of the display panel 10 , and the steps 23 are arranged in sequence and at intervals along the inclined direction.

[0105] Of any two adjacent steps 23, the step 23 farther from the base 1 is closer to the second edge 2102 than the step 23 closer to the base 1.

[0106] Specifically, among any two steps 23, the spacing between the orthographic projection of the step 23 close to the first edge 2101 on the substrate 1 and the orthographic projection of the first edge 2101 on the substrate 1 in the thickness direction of the substrate 1 is a first spacing; the spacing between the orthographic projection of the step 23 close to the second edge 2102 on the substrate 1 and the orthographic projection of the first edge 2101 on the substrate 1 in the thickness direction of the substrate 1 is a second spacing. The first spacing is smaller than the second spacing.

[0107] It can be understood that, when other conditions remain unchanged, the opening side wall 21 having the above-mentioned concave-convex structure 22 and / or step 23 can effectively improve the bonding force between the pixel definition layer 2 and the relevant film layer when it contacts any one of the light-emitting functional layer 3, the second electrode layer 6 and the encapsulation layer 7.

[0108] Taking the light-emitting functional layer 3 as an example, the opening side wall 21 having the above-mentioned concave-convex structure 22 and / or step 23 can effectively improve the bonding force between the pixel definition layer 2 and the light-emitting functional layer 3 when in contact with the light-emitting functional layer 3, so that the force between the pixel definition layer 2 and the light-emitting functional layer 3 is greater than the force between the light-emitting functional layer 3 and the encapsulation layer 7, thereby effectively avoiding the light-emitting functional layer 3 being affected by the initial stress of the encapsulation layer 7 and causing peeling defects relative to the pixel opening 201 of the pixel definition layer 2.

[0109] Taking the second electrode layer 6 as an example, the opening side wall 21 having the above-mentioned concave-convex structure 22 and / or step 23 can effectively improve the bonding force between the pixel definition layer 2 and the second electrode layer 6 when in contact with the second electrode layer 6, so that the force between the pixel definition layer 2 and the second electrode layer 6 is greater than the force between the second electrode layer 6 and the encapsulation layer 7, thereby effectively avoiding the second electrode layer 6 being affected by the initial stress of the encapsulation layer 7 and causing peeling defects relative to the pixel opening 201 of the pixel definition layer 2.

[0110] Taking the encapsulation layer 7 as an example, the opening side wall 21 having the above-mentioned concave-convex structure 22 and / or step 23 can effectively improve the bonding force between the pixel definition layer 2 and the encapsulation layer 7 when in contact with the encapsulation layer 7, thereby increasing the interaction force between the pixel definition layer 2 and the encapsulation layer 7, thereby preventing the encapsulation layer 7 from being affected by stress and causing peeling defects relative to the pixel opening 201 of the pixel definition layer 2.

[0111] See also Figure 3 and Figure 4 In the isolation structure 4 provided in the embodiment of the present application, the isolation structure 4 located between two adjacent isolation openings 401 includes a root portion 41, a support portion 42 and a crown portion 43 which are stacked in sequence, wherein the root portion 41 is arranged on one side of the substrate 1, the support portion 42 is located on the side of the root 41 which is away from the substrate 1, and the crown portion 43 is located on the side of the support portion 42 which is away from the root 41. The isolation opening 401 penetrates the crown portion 43, the support portion 42 and the root 41 and is connected to the pixel opening 201 of the pixel definition layer 2.

[0112] In some embodiments, the circumferential portion of the light-emitting functional layer 3 that contacts the pixel definition layer 2 through the pixel opening 201 can be connected to the isolation structure 4. Of course, in order to prevent leakage, the light-emitting functional layer 3 may not be connected to the isolation structure 4 at all.

[0113] The light-emitting functional layer 3 includes a plurality of film layers stacked in sequence along the thickness direction of the substrate 1, wherein part of the film layers on the side facing away from the substrate 1 can contact part of the side wall of the isolation structure 4 facing the isolation opening 401, and part of the film layers close to the substrate 1 can contact at least part of the surface of the opening side wall 21 and maintain a certain distance from the isolation structure 4.

[0114] Specifically, the light-emitting functional layer 3 includes a hole blocking layer (HBL), a light-emitting layer (EML), an optical adjustment layer (Prime) and a hole injection layer (HIL) which are stacked in sequence along the thickness direction, wherein the hole injection layer covers the pixel opening 201 and covers a portion of the surface of the pixel definition layer 2 on the side facing away from the substrate 1, and there is a gap between the hole injection layer and the isolation structure 4; the optical adjustment layer covers the side of the hole injection layer facing away from the substrate 1; the light-emitting layer covers the side of the optical adjustment layer facing away from the hole injection layer; the hole blocking layer covers the side of the light-emitting layer facing away from the optical adjustment layer, and can contact a portion of the side wall of the isolation structure 4 facing the isolation opening 401.

[0115] Those skilled in the art should be aware that the materials for the various film layers constituting the light-emitting functional layer 3 can refer to the information disclosed in the relevant technology, and this application will not describe them in detail.

[0116] See also Figure 3 and Figure 4 The portion of the film layer on the side of the light-emitting functional layer 3 facing away from the substrate 1 can contact the portion of the side wall of the isolation structure 4 close to the substrate 1; the second electrode layer 6 covers the surface of the side of the light-emitting functional layer 3 facing away from the substrate 1 and contacts the portion of the side wall of the isolation structure 4.

[0117] Specifically, the above-mentioned light-emitting functional layer 3 can overlap part of the outer wall of the root 41 of the isolation structure 4; the second electrode layer 6 can overlap part of the outer wall of the root 41 of the isolation structure 4, and / or the second electrode layer 6 can overlap part of the outer wall of the support portion 42 of the isolation structure 4 close to one end of the substrate 1.

[0118] In other similar embodiments, a gap may be provided between the orthographic projection of the light-emitting functional layer 3 on the substrate 1 and the orthographic projection of the isolation structure 4 on the substrate 1 at one end close to the substrate 1. In this case, the light-emitting functional layer 3 is not connected to the isolation structure 4, and the second electrode layer 6 can overlap with the root 41 in the isolation structure 4, or overlap with the root 41 and the support portion 42 in the isolation structure 4 at the same time.

[0119] In some embodiments, the crown portion 43 extends outward along the side wall of the support portion 42 .

[0120] Specifically, the orthographic projection of one end of the support portion 42 close to the crown portion 43 on the base 1 is located within the range of the orthographic projection of the crown portion 43 on the base 1 .

[0121] In some cases, the orthographic projection of the support portion 42 on the substrate 1 is within the orthographic projection range of the crown portion 43 on the substrate 1 ; in other cases, the orthographic projection of the crown portion 43 on the substrate 1 is within the orthographic projection range of one end of the support portion 42 close to the substrate 1 on the substrate 1 .

[0122] The cross section of the support portion 42 may be a trapezoidal or approximately trapezoidal structure.

[0123] Specifically, the cross section of the support portion 42 is a regular trapezoidal structure, and the cross sections of the root portion 41 and the crown portion 43 located on both sides of the support portion 42 in the thickness direction may be trapezoidal, rectangular or other similar structures.

[0124] In some embodiments, the root portion 41 , the support portion 42 and the crown portion 43 may be an integrally formed structure, or may be formed by stacking different materials.

[0125] Specifically, the crown portion 43 is made of metal titanium, which is a titanium metal layer; the support portion 42 is made of metal aluminum, which is an aluminum metal layer; and the root portion 41 is made of metal molybdenum, which is a molybdenum metal layer.

[0126] See also Figure 3-Figure 4 The portion of the encapsulation layer 7 located within the isolation opening 401 covers the side of the second electrode layer 6 facing away from the substrate 1 , and the portion of the encapsulation layer 7 located outside the isolation opening 401 is located on the side of the isolation structure 4 facing away from the substrate 1 .

[0127] Specifically, the above-mentioned packaging layer 7 includes a first packaging part 71, a second packaging part 72 and a third packaging part 73 which are connected in sequence. The first packaging part 71 is located in the isolation opening 401 and covers the side of the second electrode layer 6 facing away from the substrate 1. The second packaging part 72 is located on the side of the isolation structure 4 facing away from the substrate 1. The third packaging part 73 connects the first packaging part 71 and the second packaging part 72 and covers the side wall of the isolation structure 4 facing the isolation opening 401.

[0128] Specifically, the third encapsulation portion 73 covers part of the side wall of the support portion 42 in the circumferential direction, and extends to the crown portion 43 through the side wall of the support portion 42, so as to cooperate with the first encapsulation portion 71 to realize the encapsulation of the relevant film layer in the isolation opening 401, and the third encapsulation portion 73 is connected to the second encapsulation portion 72 located on the side of the isolation structure 4 facing away from the substrate 1. One end of the second encapsulation portion 72 is connected to the third encapsulation portion 73, and the other end extends toward the side of the isolation structure 4 away from the isolation opening 401 and is extended by an appropriate length, so as to further ensure the encapsulation effect of the encapsulation layer 7 on the film layer in the corresponding isolation opening 401.

[0129] The encapsulation layer 7 mentioned above may be connected to the opening sidewall 21 having the concavo-convex structure 22 and / or the step 23 through the first encapsulation portion 71 .

[0130] In some embodiments, the second packaging portion 72 is spaced apart from a surface of the isolation structure 4 facing away from the substrate 1 . At this time, at least a portion of the second packaging portion 72 is suspended relative to the isolation structure 4 , and there is a gap between the second packaging portion 72 and a surface of the isolation structure 4 facing away from the substrate 1 .

[0131] In some embodiments, the display panel 10 further includes a planarization layer and a second encapsulation layer, wherein the planarization layer covers the encapsulation layer 7 and has a relatively flat surface on a side of the planarization layer away from the substrate 1. The second encapsulation layer is located on a side of the planarization layer away from the substrate 1 and covers the planarization layer.

[0132] Taking the planarization layer as an example, the material of the planarization layer may include at least one of an organic material and an inorganic material, for example, an organic polymer (such as polyimide, acrylic resin, etc.) or an inorganic material (such as silicon oxide, silicon nitride, etc.).

[0133] The planarization layer made of organic material can be prepared by IJP (Ink-Jet Printing) and other technologies. Part of the planarization layer can flow into the isolation opening 401 and the gap formed between the second packaging part 72 and the isolation structure 4, and improve the flatness of the display panel 10 by filling the isolation opening 401, while also providing certain protection for the related film layers located therebelow.

[0134] It is understandable that the display panel 10 provided in the embodiment of the present application can improve the connection firmness between the pixel definition layer 2 and the light-emitting function layer 3 located in the pixel opening 201 by having a raised and / or recessed opening sidewall 21, effectively reduce the probability of poor peeling of the light-emitting function layer 3 at the pixel opening 201, and improve the reliability of the display panel 10. In addition, under the premise that the pixel definition layer 2 and the light-emitting function layer 3 are firmly connected, the probability of water and oxygen invading the display panel 10 through the pixel definition layer 2 can be reduced, and the pixel dark spot failure of the display panel 10 due to water and oxygen erosion can be avoided, so as to help improve the display effect and performance of the display panel 10. This structure can also improve the durability of the display panel 10 to a certain extent, so that the display panel 10 has a longer service life.

[0135] In a second aspect, the present application further provides a display device 100, see Figure 6 The display device 100 includes any one of the display panels 10 described above.

[0136] The display device 100 provided in this embodiment can be a product or component with a display function, such as a mobile phone, a notebook, a tablet computer, a smart watch, a smart bracelet, a navigator, a display, a personal digital assistant (PDA for short), etc. Since the display panel 10 in the display device 100 has the beneficial effects of any one or several of the above-mentioned display panels 10, the specific effects are referred to the specific description in the aforementioned embodiments and will not be repeated here.

[0137] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that: include: Base (1); A pixel definition layer (2) is disposed on one side of the substrate (1) and is provided with a pixel opening (201), wherein the surrounding side of the pixel opening (201) is an opening side wall (21); A light-emitting functional layer (3), the light-emitting functional layer (3) covering the pixel opening (201); Wherein, the opening side wall (21) is provided with a protrusion and / or a depression.

2. The display panel according to claim 1, characterized in that: The opening side wall (21) is provided with a concave-convex structure (22); Preferably, the concave-convex structure (22) is a burr or a wave structure.

3. The display panel according to claim 1, characterized in that: The opening side wall (21) is provided with a step (23) pointing towards the pixel opening (201).

4. The display panel according to claim 3, characterized in that: The opening side wall (21) comprises a first edge (2101) close to the base (1) and a second edge (2102) facing away from the base (1); The step (23) is provided between the first edge (2101) and the second edge (2102); Preferably, in a cross section along the thickness direction of the substrate (1), the angle between a line connecting the first edge (2101) and the second edge (2102) and the plane where the substrate (1) is located is between 30° and 75°.

5. The display panel according to claim 4, characterized in that: The step (23) comprises a third edge (231), wherein the third edge (231) is located between the first edge (2101) and the second edge (2102), and the orthographic projection of the third edge (231) on the substrate (1) is located between the orthographic projection of the first edge (2101) on the substrate (1) and the orthographic projection of the second edge (2102) on the substrate (1).

6. The display panel according to claim 5, characterized in that: The step (23) further comprises a first connecting wall (232) and a second connecting wall (233), and the third edge (231) is located at the intersection of the first connecting wall (232) and the second connecting wall (233); The first connecting wall (232) of the step (23) is connected to the first edge (2101), and the second connecting wall (233) is connected to the second edge (2102).

7. The display panel according to claim 4, characterized in that: The number of the steps (23) is at least two, and all the steps (23) are arranged in sequence and at intervals in a direction away from the base (1).

8. The display panel according to claim 7, characterized in that: Along the thickness direction of the substrate (1), of any two adjacent steps (23), the step (23) close to the second edge (2102) is located on the side of the step (23) close to the first edge (2101) away from the pixel opening (201).

9. The display panel according to claim 8, characterized in that: The pixel definition layer (2) comprises a multi-layer structure.

10. The display panel according to any one of claims 1 to 9, characterized in that: The light-emitting functional layer (3) at least partially covers the opening side wall (21) and is connected to the pixel definition layer (2).

11. The display panel according to claim 10, characterized in that: The display panel (10) further comprises an isolation structure (4), the isolation structure (4) being located on a side of the pixel definition layer (2) facing away from the substrate (1), the isolation structure (4) being provided with an isolation opening (401), the pixel opening (201) being arranged corresponding to the isolation opening (401) and being in communication with the isolation opening (401); The orthographic projection of the pixel opening (201) on the substrate (1) is located within the range of the orthographic projection of the isolation opening (401) on the substrate (1).

12. The display panel according to claim 11, characterized in that: The isolation structure (4) comprises a root portion (41), a support portion (42) and a crown portion (43), wherein the support portion (42) is located on a side of the root portion (41) facing away from the base (1), and the crown portion (43) is located on a side of the support portion (42) facing away from the root portion (41); The crown portion (43) extends outward along the side wall of the support portion (42).

13. The display panel according to claim 11, characterized in that: The display panel (10) further comprises a first electrode layer (5) and a second electrode layer (6), wherein the first electrode layer (5), the light-emitting functional layer (3) and the second electrode layer (6) are sequentially stacked on the substrate (1); The first electrode layer (5) is located between the substrate (1) and the pixel definition layer (2), and a portion of the first electrode layer (5) is exposed through the pixel opening (201) and connected to the light-emitting functional layer (3); The second electrode layer (6) is located on a side of the light-emitting functional layer (3) facing away from the substrate (1) and overlaps with the isolation structure (4); Preferably, the second electrode layer (6) further comprises an encapsulation layer (7), and the morphology of the second electrode layer (6) and the encapsulation layer (7) located above the pixel opening (201) is consistent with the pixel opening (201).

14. A display device, characterized in that: A display panel (10) comprising any one of claims 1 to 13.

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