Display panel and display device

Abstract

Embodiments of the present application provide a display panel and a display device, and relate to the technical field of display, and improve the flatness of an anode. The display panel comprises a substrate, along the light-out direction of the display panel, the substrate is sequentially provided with a transistor layer, a planarization layer and a light-emitting device layer; the light-emitting device layer comprises: an anode; a pixel definition layer located on the side of the anode away from the substrate, the pixel definition layer defines an opening area and a non-opening area, and part of the anode is exposed in the opening area; a light-emitting layer located on the side of the anode and the pixel definition layer away from the substrate and arranged corresponding to the opening area; a cathode located on the side of the pixel definition layer and the light-emitting layer away from the substrate; the display panel further comprises a first auxiliary pad layer, the first auxiliary pad layer is located on the side of at least one planarization layer away from the substrate, and in the direction perpendicular to the plane where the substrate is located, the first auxiliary pad layer does not overlap with the opening area.

Description

TECHNICAL FIELD

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

[0002] The light emitting device in the display panel is mostly top emitting light device, in which the anode of the light emitting device is a reflective electrode. In the prior art, the surface flatness of the anode is poor, when the external ambient light is incident on the anode and reflected by the anode, the reflected light is easy to diffract periodically, and then light spots are generated. Especially for the display panel covered with color filter, under the light irradiation, the light spot phenomenon is particularly obvious, which brings bad user experience. SUMMARY

[0003] Therefore, the display panel and the display device are provided, which effectively improve the flatness of the anode and weaken the reflected light spot phenomenon.

[0004] In one aspect, the present application provides a display panel, comprising a substrate, along the light emitting direction of the display panel, the substrate is sequentially provided with a transistor layer, a planarization layer and a light emitting device layer;

[0005] The light emitting device layer comprises:

[0006] an anode;

[0007] a pixel definition layer located on the side of the anode away from the substrate, the pixel definition layer defines an opening area and a non-opening area, and part of the anode is exposed in the opening area;

[0008] a light emitting layer located on the side of the anode and the pixel definition layer away from the substrate and corresponding to the opening area;

[0009] a cathode located on the side of the pixel definition layer and the light emitting layer away from the substrate;

[0010] The display panel further comprises a first auxiliary pad layer, the first auxiliary pad layer is located on the side of at least one of the planarization layers facing the substrate, and the first auxiliary pad layer does not overlap with the opening area in the direction perpendicular to the plane on which the substrate is located.

[0011] In another aspect, the present application provides a display device comprising the above display panel.

[0012] One of the above technical solutions has the following beneficial effects:

[0013] In the embodiment of the present application, the first auxiliary pad layer does not overlap with the opening area, when the organic material is coated on the first auxiliary pad layer to form the planarization layer, due to the flowability of the organic material, the first auxiliary pad layer can guide the flow of the organic material, so that part of the organic material tends to flow into the area defined by the first auxiliary pad layer, thereby thickening the thickness of the planarization layer under the anode, and the thicker the planarization layer is, the weaker the difference in the surface relief of the side of the planarization layer away from the substrate caused by the signal line under the planarization layer, thereby optimizing the planarity of the planarization layer under the anode. Moreover, from a macro perspective, the plurality of first auxiliary pad layers are densely and uniformly distributed in the entire display area, and the plurality of first auxiliary pad layers can macroscopically improve the planarity of the entire planarization layer, thereby improving the overall film forming planarity of the planarization layer.

[0014] It can be seen that the embodiment of the present application can improve the planarity of the planarization layer by using the first auxiliary pad layer, and then when the anode is formed by evaporation above the planarization layer, the planarity of the evaporated anode can be improved, and when the ambient light is reflected by the anode, the periodic diffraction of the reflected light caused by the unevenness of the anode can be effectively weakened, and the reflected light spots can be weakened or even eliminated, thereby improving the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 A schematic diagram of the film layer structure of the display panel in the prior art;

[0017] Figure 2 A top view of the display panel provided by the embodiment of the present application;

[0018] Figure 3 A top view of the display panel provided by the embodiment of the present application; Figure 2 A sectional view along the A1-A2 direction;

[0019] Figure 4 Another top view of the first auxiliary pad layer provided by the embodiment of the present application;

[0020] Figure 5 A sectional view along the B1-B2 direction; Figure 4

[0021] Figure 6 A top view of the second auxiliary pad layer provided by the embodiment of the present application;

[0022] ​Figure 7 Figure 1 is a schematic view of a display device according to an embodiment of the present application; Figure 6 Figure 2 is a sectional view along the direction of C1-C2;

[0023] Figure 8 Figure 3 is another schematic view of the first auxiliary pad layer according to an embodiment of the present application;

[0024] Figure 9 Figure 4 is another schematic view of the first auxiliary pad layer according to an embodiment of the present application;

[0025] Figure 10 Figure 5 is another schematic view of the first auxiliary pad layer according to an embodiment of the present application;

[0026] Figure 11 Figure 6 is another schematic view of the first auxiliary pad layer according to an embodiment of the present application;

[0027] Figure 12 Figure 7 is a sectional view along the direction of D1-D2; Figure 8

[0028] Figure 8 is a schematic view of the third auxiliary pad layer according to an embodiment of the present application; Figure 13

[0029] Figure 9 is a sectional view along the direction of E1-E2; Figure 14 Figure 9 Figure 10 is a schematic view of the fourth auxiliary pad layer according to an embodiment of the present application;

[0030] Figure 15 Figure 11 is another schematic view of the first auxiliary pad layer according to an embodiment of the present application;

[0031] Figure 16 Figure 15 Figure 12 is another sectional view along the direction of F1-F2;

[0032] Figure 17 Figure 13 is another schematic view of the first auxiliary pad layer according to an embodiment of the present application;

[0033] Figure 18 Figure 14 is another schematic view of the first auxiliary pad layer according to an embodiment of the present application;

[0034] Figure 19 Figure 15 is another sectional view along the direction of A1-A2; Figure 2

[0035] Figure 16 is a schematic view of the anode according to an embodiment of the present application; Figure 20

[0036] Figure 17 is a schematic view of the display device according to an embodiment of the present application. Figure 21 DETAILED DESCRIPTION

[0037] ​​​For better understanding of the technical solutions of the present application, the embodiments of the present application are described in detail below in conjunction with the drawings.

[0038] It should be noted that the embodiments described are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0040] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0041] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe the auxiliary pads, these auxiliary pads should not be limited to these terms, and these terms are only used to distinguish the auxiliary pads from each other. For example, the first auxiliary pad can also be referred to as the second auxiliary pad without departing from the scope of the embodiments of the present application, and similarly, the second auxiliary pad can also be referred to as the first auxiliary pad.

[0042] Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (a stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)".

[0043] Before describing the technical solutions provided by the embodiments of the present application, the structure of the existing display panel is first described:

[0044] As shown in Figure 1 , as shown in Figure 1As shown in a schematic diagram of a film layer structure of a display panel in the prior art, the display panel comprises a transistor layer 1', a planarization layer 2', a light emitting device layer 3' and a color filter 4' which are stacked along the light emitting direction of the display panel, wherein the transistor layer 1' is provided with a plurality of wirings, such as wirings for forming transistors 5' and various signal lines 6' connected with the transistors 5', and the like, and the light emitting device layer 3' comprises an anode 7', a light emitting layer 8' and a cathode 9' which are stacked along the light emitting direction of the display panel. Influenced by the various wirings in the transistor layer 1', the surface of the anode 7' is uneven and it is difficult to form a flat surface, and the ambient light is easily diffracted periodically after being reflected by the anode 7', and then the reflection spot is generated.

[0045] Therefore, an embodiment of the present application provides a display panel, which can be an organic light emitting display panel, as shown in Figure 2 and Figure 3 , wherein Figure 2 is a top view of the display panel provided by the embodiment of the present application, Figure 3 is Figure 2 a sectional view along the direction of A1-A2, the display panel comprises a substrate 1, and along the light emitting direction of the display panel, the substrate 1 is sequentially provided with a transistor layer 2, a planarization layer 3 and a light emitting device layer 4.

[0046] The transistor layer 2 comprises a pixel driving circuit 5 and various signal lines 6 electrically connected with the pixel driving circuit 5, such as a gate line for providing a scanning signal to the pixel driving circuit 5, a data line for providing a data signal to the pixel driving circuit 5, a power signal line for providing a power signal to the pixel driving circuit 5 and a reference signal line for providing a reference signal to the pixel driving circuit 5, and the like; the planarization layer 3 can be a single layer film structure, or the planarization layer can also be a multi-layer film structure; the light emitting device layer 4 comprises: an anode 7, the anode 7 is electrically connected with the pixel driving circuit 5 in the transistor layer 2 (not shown in the figure), for receiving the driving current transmitted by the pixel driving circuit 5, and the anode 7 is a reflective electrode formed by a lightproof metal material; a pixel definition layer 8 located on the side of the anode 7 away from the substrate 1, the pixel definition layer 8 defines an opening area 9 and a non-opening area 10, and part of the anode 7 is exposed in the opening area 9; a light emitting layer 11 located on the side of the anode 7 and the pixel definition layer 8 away from the substrate 1 and corresponding to the opening area 9; and a cathode 12 located on the side of the pixel definition layer 8 and the light emitting layer 11 away from the substrate 1, the cathode 12 is a transparent electrode formed by a transparent conductive material such as indium tin oxide.

[0047] In addition, the display panel further comprises a first auxiliary pad layer 13, the first auxiliary pad layer 13 is located on the side of at least one planarization layer 3 facing the substrate 1, and in the direction perpendicular to the plane where the substrate 1 is located, the first auxiliary pad layer 13 does not overlap with the opening area 9.

[0048] Optionally, the first auxiliary pad layer 13 extends along the extension direction of at least part of the edge of the opening region 9.

[0049] In the embodiment of the present application, the first auxiliary pad layer 13 does not overlap with the opening region 9, when the organic material is coated on the first auxiliary pad layer 13 to form the planarization layer 3, due to the flowability of the organic material, the first auxiliary pad layer 13 will have a certain guiding effect on the flow of the organic material, so that part of the organic material tends to flow from the top of the first auxiliary pad layer 13 into the area defined by the first auxiliary pad layer 13, thereby thickening the thickness of the planarization layer 3 in this area, the thicker the planarization layer 3 is, the smaller the step of the upper surface of the planarization layer 3 caused by the signal line 6 below the planarization layer 3, that is, the surface on the side of the planarization layer 3 away from the substrate 1, so that the undulation of the upper surface of the planarization layer 3 is weakened. Moreover, in combination with Figure 2 As shown in the top view of the display panel, from a macro perspective, the plurality of first auxiliary pad layers 13 are densely and uniformly distributed in the entire display area, and the plurality of first auxiliary pad layers 13 will have a macro improvement effect on the film forming flatness of the entire planarization layer 3, so as to make the upper surface of the planarization layer 3 overall tend to be flat.

[0050] It can be seen that the embodiment of the present application can improve the film forming flatness of the planarization layer 3 by using the first auxiliary pad layer 13, and the planarization layer 3 is used to carry the anode 7, and when the anode 7 is formed by evaporation above the planarization layer 3, the flatness of the evaporated anode 7 can be effectively improved. When the ambient light is reflected by the anode 7, the periodic diffraction of the reflected light caused by the unevenness of the anode 7 can be effectively weakened, the reflected light spots can be weakened or even eliminated, and the user's experience is improved.

[0051] It should be further pointed out that in the embodiment of the present application, the first auxiliary pad layer 13 does not overlap with the opening region 9, and the first auxiliary pad layer 13 is only in the non-opening region 10, which can avoid the first auxiliary pad layer 13 affecting the flatness of the light-emitting layer 11 arranged in the opening region 9, and further avoid the color deviation and other problems caused by the unevenness of the light-emitting layer 11.

[0052] Optionally, the first auxiliary pad 13 extends along the extension direction of at least a portion of the edge of the opening region 9. In this embodiment of the invention, the first auxiliary pad 13 does not overlap with the opening region 9 and extends along at least a portion of the edge of the opening region 9. That is, the first auxiliary pad 13 is disposed around or partially around the opening region 9 within the non-opening region 10. When an organic material is coated on the first auxiliary pad 13 to form a planarization layer 3, due to the certain fluidity of the organic material, the first auxiliary pad 13 will have a certain guiding effect on the flow of the organic material, causing some organic material to tend to flow from the top of the first auxiliary pad 13 to the area defined by the first auxiliary pad 13 surrounding or partially surrounding it, thereby thickening the thickness of the planarization layer 3 in that area. The thicker the planarization layer 3, the smaller the step difference of the upper surface of the planarization layer 3 caused by the signal line 6 below the planarization layer 3, that is, the surface of the planarization layer 3 facing away from the substrate 1, and thus the more the undulation of the upper surface of the planarization layer 3 can be weakened.

[0053] Furthermore, it should be noted that in this embodiment of the invention, the first auxiliary pad 13 does not overlap with the opening area 9. The first auxiliary pad 13 extends only along at least part of the edge of the opening area 9 within the non-opening area 10. This not only allows the area defined by the first auxiliary pad 13 surrounding or semi-surrounding the entire opening area 9 to be covered, effectively improving the flatness of the planarization layer 3 at the location of the entire opening area 9, but also avoids the first auxiliary pad 13 affecting the flatness of the light-emitting layer 11 disposed within the opening area 9, thereby avoiding problems such as color shift caused by the unevenness of the light-emitting layer 11.

[0054] In one implementation, such as Figure 4 and Figure 5 As shown, Figure 4 This is another top view of the first auxiliary pad 13 provided in an embodiment of the present invention. Figure 5 for Figure 4 A cross-sectional view along the B1-B2 direction shows that the transistor layer 2 includes an active layer 14, a gate layer 15, and a source / drain layer 16 sequentially disposed along the light-emitting direction of the display panel. To improve the connection reliability between the source / drain layer 16 and the anode 7, the display panel further includes an auxiliary connection layer 17. The auxiliary connection layer 17 is located between the source / drain layer 16 and the anode 7, and the source / drain layer 16 is electrically connected to the anode 7 through the auxiliary connection layer 17. Based on this, in this embodiment of the invention, the first auxiliary pad layer 13 may be formed of a conductive material, and a portion of the first auxiliary pad layer 13 may be reused as the auxiliary connection layer 17.

[0055] That is, part of the first auxiliary pad layer 13 extends along at least part of the edge of the opening area 9, for increasing the thickness of the planarization layer 3 under the anode 7, and the rest of the first auxiliary pad layer 13 is reused as the auxiliary connection layer 17, which is respectively electrically connected with the source-drain electrode layer 16 and the anode 7 through the via holes, for improving the reliability of the connection between the source-drain electrode layer 16 and the anode 7, and the first auxiliary pad layer 13 has the functions of optimizing the planarity of the planarization layer 3 and improving the signal transmission quality. Moreover, the first auxiliary pad layer 13 and the auxiliary connection layer 17 only need to be formed by using the same patterning process, and only occupy one film layer space, which not only saves the process flow and reduces the manufacturing cost, but also is more conducive to the light and thin design of the display panel.

[0056] It should be noted that, please refer to Figure 4 and Figure 5 , the anode 7 is electrically connected with the auxiliary connection layer 17 through the first via hole 18, and the auxiliary connection layer 17 is electrically connected with the source-drain electrode layer 16 through the second via hole 19, and the first via hole 18 and the second via hole 19 can be staggered in the direction perpendicular to the plane where the substrate 1 is located.

[0057] It can be understood that, when the auxiliary connection layer 17 is arranged between the source-drain electrode layer 16 and the anode 7, and part of the first auxiliary pad layer 13 is reused as the auxiliary connection layer 17, the planarization layer 3 is at least a two-layer film structure, and moreover, the first auxiliary pad layer 13 can also be spaced apart from the anode 7 by multiple layers of the planarization layer 3.

[0058] In the embodiment of the present application, please refer to Figure 5 , the planarization layer 3 includes the first planarization layer 20 and the second planarization layer 21 which are arranged in a stack, and the first auxiliary pad layer 13 is located between the first planarization layer 20 and the second planarization layer 21. Based on this structure, there is only one layer of the second planarization layer 21 between the first auxiliary pad layer 13 and the anode 7, and the first auxiliary pad layer 13 is used to optimize the film-forming planarity of the second planarization layer 21, so that the upper surface of the second planarization layer 21 tends to be flat, and then the anode 7 is directly formed above the second planarization layer 21 by evaporation, and the second planarization layer 21 is no longer spaced apart from the anode 7 by other film layers, so that the second planarization layer 21 can be effectively used to significantly improve the planarity of the anode 7. Moreover, the planarization layer 3 only includes two layers of film layers in this setting mode, and the overall film thickness will not be too large, and the thickness of the display panel can also be avoided.

[0059] In one embodiment, as shown in Figure 6 and Figure 7 , Figure 6 is a top view of the second auxiliary pad layer 22 provided in the embodiment of the present application, Figure 7 is Figure 6In a cross-sectional view along the C1-C2 direction, the display panel also includes a second auxiliary pad layer 22 disposed in the same layer as the first auxiliary pad layer 13. In a direction perpendicular to the plane of the substrate 1, the second auxiliary pad layer 22 is located between two adjacent opening regions 9 in the first direction and / or the second direction, and the second auxiliary pad layer is connected to at most one of the first auxiliary pad layers 13. The first direction and the second direction intersect, for example, the first direction is the extension direction of the gate line and the second direction is the extension direction of the data line, or the first direction is the extension direction of the data line and the second direction is the extension direction of the gate line.

[0060] By further filling the periphery of the first auxiliary pad 13 with the second auxiliary pad 22, when the organic material is coated to form the planarization layer 3, the second auxiliary pad 22 effectively occupies part of the flow space of the organic material, thereby allowing more organic material to flow into the area defined by the first auxiliary pad 13 surrounding or semi-surrounding it, thus thickening the planarization layer 3 in that area to a greater extent. Moreover, the second auxiliary pad 22 can allow the deviated organic material to flow back into the area defined by the first auxiliary pad 13 surrounding or semi-surrounding it, while avoiding excessive accumulation of organic material at the edge of the non-opening area of ​​the anode 7 or at the edge of the opening area 9, which can more effectively weaken the step difference of the upper surface undulation of the planarization layer 3 and improve the flatness of the anode 7.

[0061] Furthermore, when a portion of the first auxiliary pad 13 is reused as an auxiliary connection layer 17, and the first auxiliary pad 13 is connected to the second auxiliary pad 22, the equivalent load resistance of the first auxiliary pad 13 is reduced. When the drive current signal of the source-drain layer 16 is transmitted to the anode 7 through the portion of the first auxiliary pad 13 reused as an auxiliary connection layer 17, the voltage drop of the signal can be reduced, and the accuracy of the light emission brightness of the light-emitting device can be improved.

[0062] In one implementation, such as Figure 8 and Figure 9 As shown, Figure 8 This is another top view of the first auxiliary pad 13 provided in an embodiment of the present invention. Figure 9 This is another structural schematic diagram of the first auxiliary pad 13 provided in an embodiment of the present invention. The first auxiliary pad 13 is disposed around the opening region 9. In this case, the first auxiliary pad 13 is a closed pad structure surrounding the opening region 9. The first auxiliary pad 13 has a more obvious guiding effect on the flow of organic material used to form the planarization layer 3, thereby significantly improving the film planarization of the planarization layer 3, and further improving the planarization of the anode 7 to a greater extent.

[0063] Alternatively, the first auxiliary padding layer 13 can also be an unclosed padding structure surrounding the opening region 9, specifically, such as... Figure 10 and Figure 11 As shown,Figure 10 Another plan view of the first auxiliary pad layer 13 provided by an embodiment of the present application, Figure 11 Another plan view of the first auxiliary pad layer 13 provided by an embodiment of the present application, the first auxiliary pad layer 13 comprises a plurality of auxiliary pad layer portions 23, the plurality of auxiliary pad layer portions 23 are arranged along the edges of the opening region 9 and are spaced apart between two adjacent auxiliary pad layer portions 23, at this time, the first auxiliary pad layer 13 still surrounds the entire opening region 9, and the first auxiliary pad layer 13 can still guide the flow of the organic material used to form the planarization layer 3, and improve the film planarity of the planarization layer 3.

[0064] In addition, it should be noted that in different layout designs of display panels, the positions of the signal lines 6 and the pixel driving circuit 5 in the transistor layer 2 are different, and thus the influence of the wirings in the transistor layer 2 on the planarity of the anode 7 is also different.

[0065] For example, when part of the signal lines 6 in the transistor layer 2, such as the data line Data and the power signal line PVDD, extend through the opening region 9, the part of the wirings will pad up the local position of the planarization layer 3, and after the first auxiliary pad layer 13 thickens the thickness of the planarization layer 3, the planarization layer 3 can still be convex upward at the positions of the data line Data and the power signal line PVDD. Therefore, in combination with the first auxiliary pad layer 13, Figure 8 and Figure 10 As shown in Figure 12 , Figure 12 for Figure 8 A sectional view along the D1-D2 direction, the first auxiliary pad layer 13 can overlap with part of the anode 7 located in the non-opening region 10, at this time, the first auxiliary pad layer 13 can further pad up the edge part of the anode 7 overlapping with it, compensate for the height difference of the convex middle part of the anode 7 caused by the data line Data and the power signal line PVDD, and further optimize the overall planarity of the anode 7.

[0066] It should be noted that when the data line Data and the power signal line PVDD extend through the opening region 9, the first auxiliary pad layer 13 can adopt the setting mode as shown in Figure 8 The first auxiliary pad layer 13 is a closed pad layer structure overlapping with the edge part of the anode 7, so that the first auxiliary pad layer 13 can pad up the edge part of the anode 7 in all directions, and weaken the height difference between the middle part and the edge part of the anode 7 at all positions.

[0067] In addition, it should be noted that when part of the first auxiliary pad layer 13 is reused as the auxiliary connection layer 17, the part of the first auxiliary pad layer 13 overlapping with the edge part of the anode 7 can also play a shielding electrode role, avoiding signal interference between adjacent anodes 7, and improving the accuracy of signals transmitted on the anode 7.

[0068] Further, please refer again to Figure 12 In the direction perpendicular to the plane where the substrate substrate 1 is located, the minimum distance d1 between the first auxiliary pad layer 13 and the opening area 9 is greater than 2 μm. It should be noted that please refer again to Figure 12 When the groove in the pixel definition layer 8 for defining the opening area 9 is an inverted trapezoid, the opening area 9 of the embodiment of the present application refers to the area defined by the edge of the surface of the pixel definition layer 8 away from the substrate substrate 1, that is, the minimum distance between the first auxiliary pad layer 13 and the opening area 9 refers to the minimum distance between the first auxiliary pad layer 13 and the edge of the surface of the pixel definition layer 8 away from the substrate substrate 1 in the direction perpendicular to the plane where the substrate substrate 1 is located. In addition, it should be noted that when part of the first auxiliary pad layer 13 is reused as the auxiliary connection layer 17, the minimum distance d1 between the first auxiliary pad layer 13 and the opening area 9 is greater than 2 μm does not define the distance between the part of the first auxiliary pad layer 13 reused as the auxiliary connection layer 17 and the opening area 9.

[0069] It can be understood that due to factors such as process precision, the actual forming position of the first auxiliary pad layer 13 may be offset, and if the distance between the first auxiliary pad layer 13 and the opening area 9 is too small, the position of the first auxiliary pad layer 13 may be offset towards the opening area 9, and the first auxiliary pad layer 13 may overlap with the opening area 9, which will affect the flatness of the light-emitting layer 11 provided in the opening area 9. In the embodiment of the present application, in the direction perpendicular to the plane where the substrate substrate 1 is located, by setting the minimum distance d1 between the first auxiliary pad layer 13 and the opening area 9 to be greater than 2 μm, the range is greater than the process error, even if the position of the first auxiliary pad layer 13 is offset towards the opening area 9, the risk of the first auxiliary pad layer 13 overlapping with the opening area 9 can be reduced, and problems such as color deviation caused by the unevenness of the light-emitting layer 11 can be avoided.

[0070] In addition, it should be noted that in order to realize color display, the opening area 9 defined by the pixel definition layer 8 includes a red light opening area for emitting red light, a green light opening area for emitting green light, and a blue light opening area for emitting blue light, and in actual application, under the premise that the minimum distance d1 between the first auxiliary pad layer 13 and each opening area 9 is greater than 2 μm, the distances between the first auxiliary pad layer 13 and the red light opening area, the green light opening area, and the blue light opening area can be equal or not equal.

[0071] Further, as Figure 13As shown, Figure 13 This is a schematic diagram of the structure of the third auxiliary pad provided in an embodiment of the present invention. Due to the influence of the trace below the anode 7, a local area of ​​the anode 7 in the opening region 9 protrudes upward. The anode 7 has a maximum height difference D. Therefore, the display panel also includes a third auxiliary pad 24. In the direction perpendicular to the plane of the substrate 1, the third auxiliary pad 24 overlaps with the first auxiliary pad 13. The sum of the film thicknesses of the third auxiliary pad 24 and the first auxiliary pad 13 is equal to the maximum height difference D.

[0072] If the maximum height difference D of the anode 7 is large, the film thickness of the single-layer first auxiliary pad 13 is difficult to compensate. A third auxiliary pad 24 can be superimposed at the location of the first auxiliary pad 13. The sum of the film thicknesses of the first auxiliary pad 13 and the third auxiliary pad 24 can be used to compensate for the maximum height difference D of the anode 7 in the opening area 9, so that the edge part of the anode 7 is sufficiently raised, thereby further weakening the step difference between the edge part and the middle part of the anode 7.

[0073] In one embodiment, the step difference between the middle and edge portions of the anode 7 is small. By increasing the thickness of the planarization layer 3 using the first auxiliary pad layer 13, the planarization layer 3 can be made flatter, thereby making the anode 7 flatter. Therefore, it is no longer necessary to use the first auxiliary pad layer 13 to raise the edge portion of the anode 7 excessively. In this case, please refer again. Figure 9 and Figure 11 ,like Figure 14 As shown, Figure 14 for Figure 9 In the cross-sectional view along the E1-E2 direction, the first auxiliary pad 13 does not overlap with the portion of the anode 7 located in the non-opening region 10. The overall flatness of the anode 7 is improved only by optimizing the film flatness of the planarization layer 3.

[0074] Furthermore, to avoid overlap between the first auxiliary pad 13 and the edge of the anode 7 due to factors such as process precision, which could affect the flatness of the anode 7, please refer again... Figure 14 In the direction perpendicular to the plane of the substrate 1, the minimum distance d2 between the first auxiliary pad layer 13 and the anode 7 is greater than 2μm.

[0075] In one implementation, such as Figure 15 As shown, Figure 15A top view of the fourth auxiliary pad layer 25 provided by the embodiment of the present application, the display panel further comprises a fourth auxiliary pad layer 25, which is located on the side of the at least one planarization layer 3 facing the substrate 1. In the direction perpendicular to the plane on which the substrate 1 is located, the fourth auxiliary pad layer 25 is located between two adjacent open areas 9 in the first direction and / or the second direction. After the fourth auxiliary pad layer 25 further fills the periphery of the first auxiliary pad layer 13, more organic material can flow into the area surrounded by the first auxiliary pad layer 13 or semi-surrounded by the first auxiliary pad layer 13 when the planarization layer 3 is coated with organic material, which can thicken the planarization layer 3 in this area to a greater extent and more significantly optimize the film planarity of the planarization layer 3, thereby improving the planarity of the anode.

[0076] Further, as shown in Figure 16 , Figure 16 For Figure 15 A sectional view along the F1-F2 direction, in order to simplify the manufacturing process of the fourth auxiliary pad layer 25, the fourth auxiliary pad layer 25 can be disposed in the same layer as the first auxiliary pad layer 13, and the fourth auxiliary pad layer 25 connects the two adjacent first auxiliary pad layers 13. At this time, the fourth auxiliary pad layer 25 is connected with the first auxiliary pad layer 13 as a whole, and there is no gap between the fourth auxiliary pad layer 25 and the first auxiliary pad layer 13. The organic material used to form the planarization layer 3 tends to flow into the area surrounded by the first auxiliary pad layer 13 or semi-surrounded by the first auxiliary pad layer 13, further thickening the thickness of the planarization layer 3 under the anode 7.

[0077] In an embodiment, as shown in Figure 17 and Figure 18 , Figure 17 Another top view of the first auxiliary pad layer 13 provided by the embodiment of the present application, Figure 18 Another top view of the first auxiliary pad layer 13 provided by the embodiment of the present application, the display panel further comprises a wire changing via 26 disposed adjacent to the open area 9, which penetrates the planarization layer 3. For example, the wire changing via 26 can be a via between the anode 7 and the source-drain electrode layer 16. When the first auxiliary pad layer 13 extends along the edge of the open area 9, in order to avoid the influence of the first auxiliary pad layer 13 on the via, the first auxiliary pad layer 13 can avoid the wire changing via 26. Specifically, please refer to Figure 17 again, the first auxiliary pad layer 13 is discontinuously disposed at the position of the wire changing via 26; or, please refer to Figure 18 again, the first auxiliary pad layer 13 is wound along the side of the wire changing via 26 away from the open area 9. When the first auxiliary pad layer 13 is wound along the side of the wire changing via 26 away from the open area 9, the first auxiliary pad layer 13 can be further electrically connected with the fixed potential signal terminal, so that the first auxiliary pad layer 13 plays a role of shielding electrode and shields the interference of other signals on the signal transmitted by the wire changing via 26.

[0078] Of course, it can be understood that when the first auxiliary pad layer 13 is disconnected at the via hole 26 or is arranged in a winding manner, a fourth auxiliary pad layer 25 can be further arranged around the periphery of the first auxiliary pad layer 13 as shown, and the first auxiliary pad layer 13 and the fourth auxiliary pad layer 25 are arranged in communication to further improve the film planarity of the planarization layer 3. Figure 15

[0079] In an embodiment, as shown, Figure 19 Figure 19 In an embodiment, as shown, Figure 2 In another cross-sectional view along the A1-A2 direction, the transistor layer 2 includes the active layer 14, the gate layer 15 and the source-drain layer 16 arranged in sequence along the light-emitting direction, and the first auxiliary pad layer 13 is arranged in the same layer as the source-drain layer 16, at this time, the first auxiliary pad layer 13 only needs to use the same patterning process as the source-drain layer 16, saving the process flow of separately forming the first auxiliary pad layer 13 and reducing the manufacturing cost. It should be noted that when the first auxiliary pad layer 13 is arranged in the same layer as the source-drain layer 16, there can be only one planarization layer 3 between the source-drain layer 16 and the anode 7, and the planarization layer 3 is in direct contact with the first auxiliary pad layer 13 and the anode 7, respectively. After the first auxiliary pad layer 13 optimizes the planarity of the planarization layer 3, the planarity of the anode 7 is directly optimized by using the higher planarity of the planarization layer 3, which has a significant improvement effect on the planarity of the anode 7. Moreover, the film thickness of the single-layer planarization layer 3 will not be too large, which is more conducive to realizing the lightweight design of the display panel.

[0080] In an embodiment, the width of the first auxiliary pad layer 13 in the vertical direction of its extension is positively correlated with the width of the non-opening area 10 where the first auxiliary pad layer 13 is located. If the width of the non-opening area 10 where the first auxiliary pad layer 13 is located is larger, the width of the first auxiliary pad layer 13 can be set to be larger, thereby more greatly improving the film planarity of the planarization layer 3, and if the width of the non-opening area 10 where the first auxiliary pad layer 13 is located is smaller, the width of the first auxiliary pad layer 13 can be set to be smaller, thereby avoiding the influence of process precision and other factors, causing the first auxiliary pad layer 13 to overlap with the opening area 9 and affecting the planarity of the light-emitting layer 8 in the opening area 9.

[0081] In an embodiment, as shown, Figure 20 Figure 20 is a schematic view of the shape of the anode 7 provided by the embodiment of the present application. At least part of the edge of the anode 7 is a non-straight edge, so that the periodic diffraction of the reflected light reflected by the anode 7 can be broken, and the subsequent constructive interference and destructive interference can be avoided, and the light spot phenomenon can be weakened.

[0082] ​​​Further, on the basis of improving the diffraction phenomenon, in order to improve the regularity of the shape of the anode 7, the edge of the anode 7 is a zigzag edge or a wavy edge.

[0083] Based on the same inventive concept, the embodiment of the present application also provides a display device, as shown in Figure 21 Figure 21 The display device provided by the embodiment of the present application is shown in the structural schematic diagram. The display device comprises the display panel 100. The specific structure of the display panel 100 has been described in detail in the above embodiment, and will not be repeated here. Of course, Figure 21 The display device shown in the figure is only for illustrative purposes. The display device can be any electronic device with display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper or a television.

[0084] Since the display device provided by the embodiment of the present application comprises the display panel 100, in the display device, the first auxiliary pad layer 13 is arranged around or semi-around the opening area 9 in the non-opening area 10. When the organic material is coated on the first auxiliary pad layer 13 to form the planarization layer 3, part of the organic material tends to flow from the top of the first auxiliary pad layer 13 to the area defined by the first auxiliary pad layer 13, thereby thickening the thickness of the planarization layer 3 in the area. The thicker the planarization layer 3 is, the smaller the step of the upper surface of the planarization layer 3 caused by the signal line 6 below the planarization layer 3, that is, the surface on the side of the planarization layer 3 away from the substrate 1, so that the fluctuation of the upper surface of the planarization layer 3 is weakened, and the upper surface of the planarization layer 3 tends to be flat as a whole. Then, when the anode 7 is formed by evaporation above the planarization layer 3, the flatness of the evaporated anode 7 can be improved. After the ambient light is reflected by the anode 7, the periodic diffraction phenomenon of the reflected light caused by the unevenness of the anode 7 can be effectively weakened, the reflected light spots can be weakened or even eliminated, and the user's experience can be improved.

[0085] The above description is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0086] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or part or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.​

Claims

1. A display panel, characterized in that, The display includes a substrate, and along the light emission direction of the display panel, a transistor layer, a planarization layer and a light-emitting device layer are sequentially disposed on the substrate. The light-emitting device layer includes: anode; A pixel definition layer is located on the side of the anode facing away from the substrate, the pixel definition layer defining an opening area and a non-opening area, and a portion of the anode is exposed in the opening area; A light-emitting layer is located on the side of the anode and the pixel definition layer facing away from the substrate and corresponding to the opening area; The cathode is located on the side of the pixel definition layer and the light-emitting layer facing away from the substrate. The display panel further includes a first auxiliary pad layer, which is located on the side of at least one planarization layer facing the substrate. In a direction perpendicular to the plane of the substrate, the first auxiliary pad layer does not overlap with the opening area.

2. The display panel according to claim 1, characterized in that, The transistor layer includes an active layer, a gate layer, and a source / drain layer sequentially disposed along the light emission direction of the display panel. The display panel also includes an auxiliary connection layer, which is located between the source / drain layer and the anode. The source / drain layer is electrically connected to the anode through the auxiliary connection layer. The first auxiliary pad is formed of a conductive material, and a portion of the first auxiliary pad is reused as the auxiliary connection layer.

3. The display panel according to claim 2, characterized in that, The planarization layer includes a first planarization layer and a second planarization layer stacked together, with the first auxiliary pad layer located between the first planarization layer and the second planarization layer.

4. The display panel according to claim 2, characterized in that, The display panel further includes a second auxiliary pad layer disposed in the same layer as the first auxiliary pad layer. In a direction perpendicular to the plane of the substrate, the second auxiliary pad layer is located between two adjacent opening areas in the first direction and / or the second direction. The second auxiliary pad layer is connected to at most one of the first auxiliary pad layers. The first direction intersects the second direction.

5. The display panel according to claim 1, characterized in that, The first auxiliary pad is disposed around the opening area.

6. The display panel according to claim 1, characterized in that, The first auxiliary padding layer includes a plurality of auxiliary padding layers, which are arranged along the edge of the opening area and are spaced apart from each other.

7. The display panel according to claim 1, characterized in that, The first auxiliary pad overlaps with the portion of the anode located in the non-opening region.

8. The display panel according to claim 7, characterized in that, In a direction perpendicular to the plane of the substrate, the minimum distance between the first auxiliary pad layer and the opening area is greater than 2 μm.

9. The display panel according to claim 7, characterized in that, The anode within the opening region has a maximum height difference. The display panel also includes a third auxiliary pad layer. In a direction perpendicular to the plane of the substrate, the third auxiliary pad layer overlaps with the first auxiliary pad layer. The sum of the film thicknesses of the third auxiliary pad layer and the first auxiliary pad layer is equal to the maximum height difference.

10. The display panel according to claim 1, characterized in that, The first auxiliary pad layer does not overlap with the portion of the anode located in the non-opening region.

11. The display panel according to claim 10, characterized in that, In a direction perpendicular to the plane of the substrate, the minimum distance between the first auxiliary pad layer and the anode is greater than 2 μm.

12. The display panel according to claim 1, characterized in that, The display panel further includes a fourth auxiliary pad layer, which is located on the side of at least one planarization layer facing the substrate. In a direction perpendicular to the plane of the substrate, the fourth auxiliary pad layer is located between two adjacent opening regions in a first direction and / or a second direction.

13. The display panel according to claim 12, characterized in that, The fourth auxiliary pad layer is disposed in the same layer as the first auxiliary pad layer, and two adjacent first auxiliary pad layers are connected through the fourth auxiliary pad layer.

14. The display panel according to claim 1, characterized in that, The display panel also includes a cable switching via disposed adjacent to the opening area; The first auxiliary pad layer is disconnected at the location of the cable switching via; Alternatively, the first auxiliary pad layer may be wound around the side of the wire-changing via that is away from the opening area.

15. The display panel according to claim 1, characterized in that, The transistor layer includes an active layer, a gate layer, and a source / drain layer arranged sequentially along the light emission direction, and the first auxiliary pad layer is disposed in the same layer as the source / drain layer.

16. The display panel according to claim 1, characterized in that, The width of the first auxiliary pad in the direction perpendicular to its extension is positively correlated with the width of the non-opening area where the first auxiliary pad is located.

17. The display panel according to claim 1, characterized in that, At least a portion of the edge of the anode is a non-linear edge.

18. The display panel according to claim 17, characterized in that, The edge of the anode is a zigzag edge or a wavy edge.

19. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 18.

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