Display panel, manufacturing method thereof and display device

Abstract

The application provides a display panel and a manufacturing method thereof, and a display device. The display panel comprises a substrate, and a light-emitting device layer on the substrate. The light-emitting device layer comprises a first electrode layer, a light-emitting layer and a second electrode layer which are stacked on the substrate. The application provides a first auxiliary electrode between the substrate and the light-emitting layer. The first auxiliary electrode comprises a first undercut opening which penetrates the first auxiliary electrode. The side of the first auxiliary electrode is exposed in the first undercut opening. The light-emitting layer is discontinuously arranged at the first undercut opening. The second electrode layer is continuously arranged at the first undercut opening. At least part of the second electrode layer is in contact with the side of the first auxiliary electrode. The first auxiliary electrode is used as a parallel resistance of the second electrode layer to reduce the impedance of the second electrode layer, thereby improving the voltage drop effect of the second electrode layer. The first auxiliary electrode comprises the first undercut opening, thereby saving the process step of additionally arranging the first undercut opening.

Description

Technical Field

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

[0002] Organic light-emitting diode (OLED) display panels have many advantages, such as self-illumination, low driving voltage, high luminous efficiency, short response time, high contrast, wide viewing angle, wide operating temperature range, and the ability to achieve flexible display and large-area full-color display. They are widely recognized in the industry as the display with the greatest development potential.

[0003] In recent years, OLED has developed rapidly, not only making curved displays, but also gradually moving towards larger sizes. However, in large-size OLEDs, in order to increase the transmittance of the display panel, the metal cathode is usually thinned, which results in a large impedance of the metal cathode and a serious current drop (IR-drop), causing obvious uneven brightness of the display panel, which seriously affects the display effect of OLED display devices. Summary of the Invention

[0004] This application provides a display panel, a method for manufacturing the same, and a display device to alleviate the shortcomings of related technologies.

[0005] To achieve the above functions, the technical solutions provided in this application are as follows:

[0006] A display panel, comprising:

[0007] Base;

[0008] A light-emitting device layer is disposed on the substrate, the light-emitting device layer comprising a first electrode layer, a light-emitting layer and a second electrode layer sequentially stacked on the substrate;

[0009] A first auxiliary electrode is located between the substrate and the light-emitting layer;

[0010] The first auxiliary electrode includes a first undercut opening that penetrates the first auxiliary electrode. The side of the first auxiliary electrode is exposed within the first undercut opening. The light-emitting layer is discontinuously disposed at the first undercut opening. The second electrode layer is continuously disposed at the first undercut opening, and at least a portion of the second electrode layer is in contact with the side of the first auxiliary electrode.

[0011] In the display panel provided in the embodiments of this application, the second electrode layer includes a first main body and a connecting part. The first main body is located on the side of the first auxiliary electrode away from the substrate, and the connecting part is located inside the first bottom cut-out opening. The connecting part is in contact with the side of the first auxiliary electrode, and the connecting part is connected to the first main body at the side of the first auxiliary electrode.

[0012] In the display panel provided in the embodiments of this application, the first auxiliary electrode includes a first conductive layer, a second conductive layer and a third conductive layer stacked together, and the second conductive layer is located between the first conductive layer and the third conductive layer;

[0013] The first undercut opening includes a first sub-undercut opening disposed on the first conductive layer, a second sub-undercut opening disposed on the second conductive layer, and a third sub-undercut opening disposed on the third conductive layer. The first sub-undercut opening, the second sub-undercut opening, and the third sub-undercut opening are interconnected. The diameters of the first sub-undercut opening and the third sub-undercut opening are both smaller than the diameter of the second sub-undercut opening.

[0014] In the display panel provided in the embodiments of this application, the light-emitting layer includes a second main body and a branch portion. The second main body is located between the first auxiliary electrode and the first main body, and the branch portion is located within the first sub-bottom cut-out. The branch portion is disconnected from the second main body, and the orthographic projection of the connecting portion on the substrate covers the orthographic projection of the branch portion on the substrate.

[0015] In the display panel provided in this application embodiment, the branch portion is located within the first sub-bottom cut-out, and the thickness of the branch portion is less than or equal to the thickness of the first conductive layer.

[0016] In the display panel provided in the embodiments of this application, within the first bottom cut opening, the connecting portion contacts the side of the first conductive layer away from the substrate, the connecting portion contacts the side of the second conductive layer, and the connecting portion contacts the side of the third conductive layer.

[0017] In the display panel provided in this application embodiment, the first electrode layer includes a second auxiliary electrode located between the first auxiliary electrode and the light-emitting layer. The second auxiliary electrode is connected to the first auxiliary electrode, and the orthographic projection of the second auxiliary electrode on the substrate covers the orthographic projection of the first auxiliary electrode on the substrate. The second auxiliary electrode includes a second undercut opening corresponding to the first undercut opening. The second undercut opening penetrates the second auxiliary electrode, and the side of the second auxiliary electrode is exposed in the second undercut opening. The light-emitting layer is discontinuously disposed at the second undercut opening, and the second electrode layer is continuously disposed at the second undercut opening. The second undercut opening and the first undercut opening are interconnected. The second electrode layer extends from the second undercut opening into the first undercut opening, and at least a portion of the second electrode layer is in contact with the side of the second auxiliary electrode.

[0018] In the display panel provided in this application embodiment, the second auxiliary electrode includes a fourth conductive layer, a fifth conductive layer, and a sixth conductive layer stacked together, wherein the fifth conductive layer is located between the fourth conductive layer and the sixth conductive layer;

[0019] The first undercut opening includes a fourth sub-undercut opening disposed on the fourth conductive layer, a fifth sub-undercut opening disposed on the fifth conductive layer, and a sixth sub-undercut opening disposed on the sixth conductive layer, wherein the fourth sub-undercut opening, the fifth sub-undercut opening, and the sixth sub-undercut opening are interconnected.

[0020] In the display panel provided in the embodiments of this application, the first auxiliary electrode includes a first conductive layer, a second conductive layer and a third conductive layer stacked together, and the second conductive layer is located between the first conductive layer and the third conductive layer;

[0021] The first conductive layer includes a first conductive sub-part and a first extension, the first conductive sub-part is connected to the second conductive layer, and the orthographic projection of the first extension on the substrate does not overlap with the orthographic projection of the second conductive layer on the substrate; the third conductive layer includes a second conductive sub-part and a second extension, the second conductive sub-part is connected to the second conductive layer, and the orthographic projection of the second extension on the substrate does not overlap with the orthographic projection of the second conductive layer on the substrate.

[0022] The first extension, the side surface of the second conductive layer, and the second extension form the first undercut opening.

[0023] This application provides a method for manufacturing a display panel, including the following steps:

[0024] Provide a base;

[0025] A first auxiliary electrode is formed on the substrate, and a first undercut opening is formed on the first auxiliary electrode. The first undercut opening penetrates the first auxiliary electrode, and the side of the first auxiliary electrode is exposed in the first undercut opening.

[0026] A first electrode layer, a light-emitting layer, and a second electrode layer are sequentially formed on the side of the first auxiliary electrode away from the substrate; wherein the light-emitting layer is discontinuously disposed at the first undercut opening, the second electrode layer is continuously disposed at the first undercut opening, and at least a portion of the second electrode layer is in contact with the side of the first auxiliary electrode.

[0027] This application provides a display device including any of the display panels described above.

[0028] The beneficial effects of this application embodiment are as follows: This application embodiment provides a first auxiliary electrode between the substrate and the light-emitting layer. The first auxiliary electrode includes a first undercut opening that penetrates the first auxiliary electrode. The side of the first auxiliary electrode is exposed within the first undercut opening. The light-emitting layer is discontinuously disposed at the first undercut opening. The second electrode layer is continuously disposed at the first undercut opening, and at least a portion of the second electrode layer is in contact with the side of the first auxiliary electrode. By using the first auxiliary electrode as a parallel resistor for the second electrode layer, the impedance of the second electrode layer is reduced, thereby improving the voltage drop effect of the second electrode layer and improving the display quality of the display panel. Furthermore, by using the first auxiliary electrode including the first undercut opening, the additional process step of setting the undercut opening is saved. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a first cross-sectional schematic diagram of the display panel provided in an embodiment of this application;

[0031] Figure 2 This is a first cross-sectional schematic diagram of the first auxiliary electrode of the display panel provided in an embodiment of this application;

[0032] Figure 3 This is a second cross-sectional schematic diagram of the display panel provided in an embodiment of this application;

[0033] Figure 4A cross-sectional schematic diagram of the second auxiliary electrode of the display panel provided in an embodiment of this application;

[0034] Figure 5 This is a third cross-sectional schematic diagram of the display panel provided in an embodiment of this application;

[0035] Figure 6 This is a second cross-sectional schematic diagram of the first auxiliary electrode of the display panel provided in an embodiment of this application;

[0036] Figure 7 This is a fourth cross-sectional schematic diagram of the display panel provided in the embodiments of this application;

[0037] Figure 8 A flowchart illustrating a method for manufacturing a display panel as provided in an embodiment of this application;

[0038] Figures 9A to 9G for Figure 8 A flowchart illustrating the structural process of manufacturing the central display panel. Detailed Implementation

[0039] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0040] This application provides a display panel, a method for manufacturing the same, and a display device. These will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments.

[0041] Please refer to the combination Figure 1 and Figure 2 ;in, Figure 1 This is a first cross-sectional schematic diagram of the display panel provided in an embodiment of this application; Figure 2 This is a first cross-sectional schematic diagram of the first auxiliary electrode of the display panel provided in an embodiment of this application.

[0042] This embodiment provides a display panel 1, which includes, but is not limited to, one of light-emitting diode (LED) and organic light-emitting diode (OLED) display panels. This embodiment does not impose specific limitations on either one. It should be noted that this embodiment uses an organic light-emitting diode display panel as an example to describe the technical solution of this application.

[0043] In this embodiment, the display panel 1 includes a substrate 10, a thin film transistor layer 40 disposed on the substrate 10, and a light-emitting device layer 60 disposed on the side of the thin film transistor layer 40 away from the substrate 10.

[0044] Furthermore, in this embodiment, the display panel 1 further includes a buffer layer 30 and a light-shielding layer 20 located between the substrate 10 and the thin-film transistor layer 40. The buffer layer 30 is located on the side of the light-shielding layer 20 away from the substrate 10, and the orthographic projection of the light-shielding layer 20 on the substrate 10 at least covers the orthographic projection of the active layer 41 on the substrate 10. The light-shielding layer 20 can block light incident on the active layer 41, thereby reducing the increase in leakage current caused by photogenerated carriers generated by light irradiating the active layer 41, and thus maintaining the stability of the thin-film transistor 40A during operation.

[0045] The thin-film transistor layer 40 includes an active layer 41, a gate insulating layer 42, a gate 43, an interlayer insulating layer 44, a source 46A, and a drain 46B located on the insulating layer. Specifically, the thin-film transistor layer 40 includes at least one thin-film transistor 40A, which includes the active layer 41, the gate insulating layer 42, the gate 43, the interlayer insulating layer 44, the source 46A, and the drain 46B sequentially stacked on the substrate 10. The source 46A and the drain 46B are on the same layer and spaced apart. That is, this embodiment uses a top-gate thin-film transistor as an example to illustrate the technical solution of this application.

[0046] The active layer 41 includes a first conductor portion (not marked in the figure) and a second conductor portion (not marked in the figure), and an active segment (not marked in the figure) located between the first conductor portion and the second conductor portion. The source electrode 46A is connected to the first conductor portion, the drain electrode 46B is connected to the second conductor portion, the drain electrode 46B is connected to the light-shielding layer 20, and the orthographic projection of the gate electrode 43 on the substrate 10 overlaps with the orthographic projection of the active segment on the substrate 10.

[0047] The display panel 1 further includes a first insulating layer 50 located between the thin film transistor layer 40 and the light-emitting device layer 60. The light-emitting device layer 60 includes a first electrode layer 61, a light-emitting layer 62, and a second electrode layer 63 sequentially stacked on the thin film transistor layer 40. The first insulating layer 50 has a first via 50A that exposes a portion of the drain electrode 46B. The light-emitting layer 62 is disposed on the first electrode layer 61, and the second electrode layer 63 is disposed on the light-emitting layer 62. A first side of the first electrode layer 61 is connected to the light-emitting layer 62, and a second side of the first electrode layer 61 is connected to the drain electrode 46B through the first via 50A.

[0048] It should be noted that this embodiment uses the example of the first electrode layer 61 including an anode and the second electrode layer 63 including a cathode to illustrate the technical solution of this application; wherein, the display panel 1 further includes a pixel definition layer 70 located on the side of the first insulating layer 50 away from the thin film transistor layer 40, the pixel definition layer 70 has a first slot 70A exposed to the first electrode layer 61, at least a portion of the light-emitting layer 62 is located in the first slot 70A, the light-emitting layer 62 is connected to the first electrode layer 61 through the first slot 70A, at least a portion of the second electrode layer 63 is located in the first slot 70A, the second electrode layer 63 is connected to the light-emitting layer 62 through the first slot 70A.

[0049] Specifically, the first insulating layer 50 includes a passivation layer 51 and a planarization layer 52 stacked on the thin film transistor layer 40. The passivation layer 51 has a first sub-via (not marked in the figure) that exposes a portion of the drain electrode 46B. The planarization layer 52 has a second sub-via (not marked in the figure) that exposes a portion of the drain electrode 46B. The second sub-via communicates with the first sub-via. The second side of the first electrode layer 61 is connected to the drain electrode 46B through the first sub-via and the second sub-via. In the direction perpendicular to the substrate 10, the aperture of the second sub-via is equal to the aperture of the first sub-via.

[0050] In this embodiment, the display panel 1 includes a light-emitting area 100 and a non-light-emitting area 200. The display panel 1 also includes a first auxiliary electrode 46C located between the substrate 10 and the light-emitting layer 62. The first auxiliary electrode 46C is located within the non-light-emitting area 200. The material of the first auxiliary electrode 46C includes, but is not limited to, at least one of copper (Cu), molybdenum (Mo), titanium (Ti), nickel (Ni), and molybdenum-titanium alloy (MoTi). Specifically, the first auxiliary electrode 46C includes a first undercut opening 460C that penetrates the first auxiliary electrode 46C. The side 4600C of the first auxiliary electrode 46C is exposed within the first undercut opening 460C. The light-emitting layer 62 is discontinuously disposed at the first undercut opening 460C. The second electrode layer 63 is continuously disposed at the first undercut opening 460C, and at least a portion of the second electrode layer 63 is in contact with the side 4600C of the first auxiliary electrode 46C.

[0051] It is understood that in this embodiment, by setting the first auxiliary electrode 46C to include a first undercut opening 460C, the light-emitting layer 62 is disconnected at the first undercut opening 460C, and the second electrode layer 63 is continuously disposed at the first undercut opening 460C. The second electrode layer 63 extends from the light-emitting layer 62 at the disconnection point of the first undercut opening 460C into the first undercut opening 460C, and at least a portion of the second electrode layer 63 is in contact with the side edge 4600C of the first auxiliary electrode 46C. By using the first auxiliary electrode 46C as a parallel resistor for the second electrode layer 63, the impedance of the second electrode layer 63 is reduced, thereby improving the voltage drop (IR drop) effect of the second electrode layer 63, which is beneficial to improving the display quality of the display panel 1. Furthermore, by using the first auxiliary electrode 46C to include a first undercut opening 460C, the process step of additionally setting an undercut opening in the prior art is saved.

[0052] In this embodiment, the second electrode layer 63 includes a first main body portion 63A and a connecting portion 63B. The first main body portion 63A is located on the side of the first auxiliary electrode 46C away from the substrate 10, and the connecting portion 63B is located within the first undercut opening 460C. The connecting portion 63B is in contact with the side edge 4600C of the first auxiliary electrode 46C, and the connecting portion 63B is connected to the first main body portion 63A at the side edge 4600C of the first auxiliary electrode 46C.

[0053] Specifically, the second electrode layer 63 covers the first undercut opening 460C, the first main body portion 63A extends from the side of the light-emitting layer 62 away from the substrate 10 toward the first undercut opening 460C, the connecting portion 63B is located on the side 4600C of the first undercut opening 460C, and the connecting portion 63B is connected to the first main body portion 63A at the side 4600C of the first auxiliary electrode 46C, thereby realizing the connection between the second electrode layer 63 and the first auxiliary electrode 46C within the first undercut opening 460C.

[0054] Further, in this embodiment, the first auxiliary electrode 46C is located between the interlayer insulating layer 44 and the first insulating layer 50. The first auxiliary electrode 46C includes a first conductive layer 46C1, a second conductive layer 46C2, and a third conductive layer 46C3 stacked together, with the second conductive layer 46C2 located between the first conductive layer 46C1 and the third conductive layer 46C3. The first bottom cut opening 460C includes a first sub-bottom cut opening 461C disposed in the first conductive layer 46C1 and a second sub-bottom cut opening 460C disposed in the second conductive layer 46C2. The first sub-undercut opening 461C, the second sub-undercut opening 462C, and the third sub-undercut opening 463C are interconnected. The diameter of the first sub-undercut opening 461C is smaller than the diameter of the second sub-undercut opening 462C, and the diameter of the third sub-undercut opening 463C is smaller than the diameter of the second sub-undercut opening 462C, thereby causing the film layer formed above the first auxiliary electrode 46C to be broken at the third sub-undercut opening 463C.

[0055] In this embodiment, the material of the first conductive layer 46C1 includes, but is not limited to, at least one of molybdenum (Mo), titanium (Ti), and molybdenum-titanium alloy (MoTi); the material of the second conductive layer 46C2 includes, but is not limited to, at least one of copper (Cu), aluminum (Al), and silver (Ag); and the material of the third conductive layer 46C3 includes, but is not limited to, at least one of molybdenum (Mo), titanium (Ti), and molybdenum-titanium alloy (MoTi). Preferably, this embodiment uses the example of the first conductive layer 46C1 being made of molybdenum-titanium alloy (MoTi), the second conductive layer 46C2 being made of copper (Cu), and the third conductive layer 46C3 being made of molybdenum-titanium alloy (MoTi) to illustrate the technical solution of this application.

[0056] It is understood that in this embodiment, the first conductive layer 46C1, the second conductive layer 46C2, and the third conductive layer 46C3 can be fabricated simultaneously in a single photomask process, thus avoiding the need for additional photomask processes and simplifying the process. Furthermore, by positioning the first conductive layer 46C1 between the second conductive layer 46C2 and the interlayer insulating layer 44, the adhesion between the second conductive layer 46C2 and the interlayer insulating layer 44 is improved, thereby reducing the risk of separation between the first auxiliary electrode 46C and the interlayer insulating layer 44. Moreover, by positioning the third conductive layer 46C3 on the side of the second conductive layer 46C2 away from the first conductive layer 46C1, protection is provided for the second conductive layer 46C2, reducing the risk of oxidation of the second conductive layer 46C2 during subsequent thermal processing.

[0057] It should be noted that, in this embodiment, the first undercut opening 460C can be formed by wet etching away the first conductive layer 46C1, the second conductive layer 46C2, and the third conductive layer 46C3. Since the material of the second conductive layer 46C2 is different from that of the first conductive layer 46C1, while the material of the first conductive layer 46C1 is the same as that of the third conductive layer 46C3, when all three are wet etched simultaneously, the etching rate of the first conductive layer 46C1 and the etching rate of the third conductive layer 46C3 are the same, while the etching rate of the first conductive layer 46C1 and the etching rate of the second conductive layer 46C2 will have a significant difference.

[0058] Specifically, the material of the first conductive layer 46C1 is less reactive than the material of the second conductive layer 46C2, and the material of the third conductive layer 46C3 is less reactive than the material of the second conductive layer 46C2. As a result, the etching rate of the second conductive layer 46C2 is greater than the etching rate of the first conductive layer 46C1, and the etching rate of the second conductive layer 46C2 is greater than the etching rate of the third conductive layer 46C3. This leads to the formation of the first sub-bottom cut opening 461C, the second sub-bottom cut opening 462C, and the third sub-bottom cut opening 463C with different opening diameters.

[0059] Furthermore, the first insulating layer 50 is also provided with a first through hole 50B, which exposes at least a portion of the first auxiliary electrode 46C. The pixel definition layer 70 includes a second through hole 70B, which communicates with the first through hole 50B. Preferably, the center line W2 of the second through hole 70B, the center line W3 of the first through hole 50B, and the center line W1 of the first undercut opening 460C coincide. The second electrode layer 63 extends into the first undercut opening 460C through the second through hole 70B and the first through hole 50B, and at least a portion of the second electrode layer 63 contacts the side 4600C of the first auxiliary electrode 46C.

[0060] Furthermore, the passivation layer 51 has a third sub-hole (not marked in the figure) exposing the first undercut opening 460C, and the planarization layer 52 has a fourth sub-hole (not marked in the figure) exposing the first undercut opening 460C. The fourth sub-hole communicates with the third sub-hole, and the diameter of the fourth sub-hole is equal to the diameter of the third sub-hole. The second electrode layer 63 extends into the first undercut opening 460C through the second through hole 70B, the fourth sub-hole, and the third sub-hole, and the connecting portion 63B contacts the side 4600C of the first auxiliary electrode 46C.

[0061] It should be noted that, in this embodiment, the second electrode layer 63 can be fabricated by sputtering or other methods, so that the second electrode layer 63 can be continuously filmed on the light-emitting layer 62, thereby achieving the overlap of the second electrode layer 63 with the first auxiliary electrode 46C at the inner wall of the first undercut opening 460C; it should also be noted that, in another embodiment, the second electrode layer 63 can be continuously filmed on the light-emitting layer 62 by adjusting the evaporation angle, thereby achieving the overlap of the second electrode layer 63 with the first auxiliary electrode 46C at the inner wall of the first undercut opening 460C.

[0062] In this embodiment, the orthographic projection of the second electrode layer 63 on the substrate 10 covers the orthographic projection of the light-emitting layer 62 on the substrate 10. The light-emitting layer 62 includes a second main body portion 62A and a branch portion 62B. The second main body portion 62A is located between the first auxiliary electrode 46C and the first main body portion 63A. The branch portion 62B is located within the first sub-bottom cutout 461C. The branch portion 62B is disconnected from the second main body portion 62A. The orthographic projection of the connecting portion 63B on the substrate 10 covers the orthographic projection of the branch portion 62B on the substrate 10.

[0063] Specifically, the branch portion 62B is located within the first sub-bottom cutout 461C, and the thickness of the branch portion 62B is less than or equal to the thickness of the first conductive layer 46C1; preferably, in this embodiment, the thickness of the branch portion 62B is equal to the thickness of the first conductive layer 46C1, and the branch portion 62B covers the bottom and inner wall of the first sub-bottom cutout 461C; wherein, within the first bottom cutout 460C, the connecting portion 63B contacts the side 46C10 of the first conductive layer 46C1 away from the substrate 10, the connecting portion 63B contacts the side 46C20 of the second conductive layer 46C2, and the connecting portion 63B contacts the side 46C30 of the third conductive layer 46C3.

[0064] Furthermore, the branch portion 62B includes a first groove 620B on the side away from the bottom of the first sub-bottom opening 461C. The connecting portion 63B is located on the side of the branch portion 62B away from the base 10, and the connecting portion 63B covers the branch portion 62B. The connecting portion 63B extends from the first groove 620B towards the first main body portion 63A. It can be understood that in this embodiment, by setting the branch portion 62B to be disconnected from the second main body portion 62A, the branch portion 62B is located within the first bottom opening 460C, and the connecting portion 63B is located on the side of the branch portion 62B away from the base 10, thereby increasing the contact area between the connecting portion 63B and the first auxiliary electrode 46C, further reducing the impedance of the second electrode layer 63, and thus improving the voltage drop (IR drop) effect of the second electrode layer 63.

[0065] It should be noted that, in this embodiment, the thickness of the branch portion 62B is less than or equal to the thickness of the first conductive layer 46C1, thereby avoiding the contact area between the connecting portion 63B and the first auxiliary electrode 46C being too small, which would affect the connection effect between the second electrode layer 63 and the first auxiliary electrode 46C.

[0066] It should be noted that, in this embodiment, the materials of the source electrode 46A and the drain electrode 46B include, but are not limited to, at least one of copper (Cu), molybdenum (Mo), titanium (Ti), and molybdenum-titanium alloy (MoTi), or a stack thereof. Preferably, this embodiment uses the example of the source electrode 46A comprising molybdenum-titanium alloy, copper, and molybdenum-titanium alloy stacked sequentially on the substrate 10, and the drain electrode 46B comprising molybdenum-titanium alloy, copper, and molybdenum-titanium alloy stacked sequentially on the substrate 10 to illustrate the technical solution of this application. That is, in this embodiment, the display panel 1 includes a first metal layer 46, and the first metal layer 46 includes the first auxiliary electrode 46C, the source electrode 46A, and the drain electrode 46B spaced apart. This embodiment simplifies the manufacturing process by setting the first auxiliary electrode 46C, the source electrode 46A, and the drain electrode 46B in the same layer.

[0067] Please combine Figure 2 , Figure 3 and Figure 4 ;in, Figure 3 This is a second cross-sectional schematic diagram of the display panel provided in an embodiment of this application; Figure 4 This is a cross-sectional schematic diagram of the second auxiliary electrode of the display panel provided in an embodiment of this application.

[0068] In this embodiment, the structure of the display panel is similar to / the same as the first structure of the display panel provided in the above embodiments. Please refer to the description of the display panel in the above embodiments for details, which will not be repeated here. The only difference between the two is:

[0069] In this embodiment, the first electrode layer 61 includes a first sub-electrode 61A and a second auxiliary electrode 61B. The first sub-electrode 61A is located in the light-emitting region 100, and the light-emitting layer 62 is disposed on the first sub-electrode 61A. The second auxiliary electrode 61B is located in the non-light-emitting region 100, and the second auxiliary electrode 61B is disposed on the light-emitting layer 62. One end of the first sub-electrode 61A is connected to the light-emitting layer 62, and the other end of the first sub-electrode 61A is connected to the drain electrode 46B through the first via 50A.

[0070] It should be noted that this embodiment uses the first sub-electrode 61A as the anode and the second electrode layer 63 including the cathode as an example to illustrate the technical solution of this application; wherein, the first slot 70A of the pixel definition layer 70 exposes part of the first sub-electrode 61A, at least part of the light-emitting layer 62 is located in the first slot 70A, the light-emitting layer 62 is connected to the first sub-electrode 61A through the first slot 70A, and the second through hole 70B of the pixel definition layer 70 exposes part of the second auxiliary electrode 61B.

[0071] The second auxiliary electrode 61B is located between the first auxiliary electrode 46C and the light-emitting layer 62. The second auxiliary electrode 61B is connected to the first auxiliary electrode 46C. The orthographic projection of the second auxiliary electrode 61B on the substrate 10 covers the orthographic projection of the first auxiliary electrode 46C on the substrate 10. The second auxiliary electrode 61B includes a second undercut opening 610B corresponding to the first undercut opening 460C. The second undercut opening 610B penetrates the second auxiliary electrode 61B. The side 6100B of the second auxiliary electrode 61B is exposed within the second undercut opening 610B. The light-emitting layer 62 is discontinuously disposed at the second undercut opening 610B. The second electrode layer 63 is continuously disposed at the second undercut opening 610B. The second undercut opening 610B and the first undercut opening 460C are interconnected. The second electrode layer 63 extends from the second undercut opening 610B into the first undercut opening 460C, and at least a portion of the second electrode layer 63 is in contact with the side 6100B of the second auxiliary electrode 61B.

[0072] It is understood that in this embodiment, by connecting the second auxiliary electrode 61B to the first auxiliary electrode 46C, the orthographic projection of the second auxiliary electrode 61B on the substrate 10 overlaps the orthographic projection of the first auxiliary electrode 46C on the substrate 10. Furthermore, the second auxiliary electrode 61B includes a second undercut opening 610B corresponding to the first undercut opening 460C. This allows the light-emitting layer 62 to be disconnected at the second undercut opening 610B, with the second electrode layer 63 extending from the second undercut opening 610B into the first undercut opening 460C. At least a portion of the second electrode layer 63 contacts the side edge 6100B of the second auxiliary electrode 61B. Through the parallel connection of the second auxiliary electrode 61B, the first auxiliary electrode 46C, and the second electrode layer 63, the impedance of the second electrode layer 63 is reduced, thereby further improving the IR drop effect of the second electrode layer 63, which is beneficial for improving the display quality of the display panel 1. Moreover, by using the first electrode layer 61 including the second auxiliary electrode 61B, and the second auxiliary electrode 61B including the second undercut opening 610B, process steps are saved.

[0073] Specifically, in this embodiment, the second auxiliary electrode 61B includes a fourth conductive layer 61B1, a fifth conductive layer 61B2, and a sixth conductive layer 61B3 stacked together, with the fifth conductive layer 61B2 located between the fourth conductive layer 61B1 and the sixth conductive layer 61B3; wherein, the second bottom cut opening 610B includes a fourth sub-bottom cut opening 611B disposed on the fourth conductive layer 61B1, a fifth sub-bottom cut opening 612B disposed on the fifth conductive layer 61B2, and a fifth sub-bottom cut opening 612B disposed on the sixth conductive layer 61B3. The sixth sub-bottom cut opening 613B of layer 61B3 is interconnected with the fourth sub-bottom cut opening 611B, the fifth sub-bottom cut opening 612B, and the sixth sub-bottom cut opening 613B. Further, the diameter of the fourth sub-bottom cut opening 611B is smaller than the diameter of the fifth sub-bottom cut opening 612B, and the diameter of the sixth sub-bottom cut opening 613B is smaller than the diameter of the fifth sub-bottom cut opening 612B, thereby causing the film layer formed above the second auxiliary electrode 61B to be broken at the sixth sub-bottom cut opening 613B.

[0074] Preferably, this embodiment uses the fourth conductive layer 61B1 as the material of indium tin oxide (ITO), the fifth conductive layer 61B2 as the material of silver (Ag), and the sixth conductive layer 61B3 as the material of indium tin oxide (ITO) as examples to illustrate the technical solution of this application.

[0075] It should be noted that, in this embodiment, the second undercut opening 610B can be formed by wet etching away the fourth conductive layer 61B1, the fifth conductive layer 61B2, and the sixth conductive layer 61B3. Since the materials of the fourth conductive layer 61B1 and the fifth conductive layer 61B2 are different, while the materials of the sixth conductive layer 61B3 and the fourth conductive layer 61B1 are the same, when all three are wet etched simultaneously, the etching rate of the fourth conductive layer 61B1 and the sixth conductive layer 61B3 will be the same, while the etching rate of the fifth conductive layer 61B2 and the fourth conductive layer 61B1 will have a significant difference.

[0076] Specifically, the material of the fourth conductive layer 61B1 is less reactive than the material of the fifth conductive layer 61B2, and the material of the sixth conductive layer 61B3 is less reactive than the material of the fifth conductive layer 61B2. As a result, the etching rate of the fourth conductive layer 61B1 is greater than that of the fifth conductive layer 61B2, and the etching rate of the sixth conductive layer 61B3 is greater than that of the fifth conductive layer 61B2. This leads to the formation of the fourth sub-bottom cut opening 611B, the fifth sub-bottom cut opening 612B, and the sixth sub-bottom cut opening 613B with different opening diameters.

[0077] Further, the center line W2 of the second through hole 70B, the center line W3 of the first through hole 50B, the center line W4 of the second bottom-cut opening 610B, and the center line W1 of the first bottom-cut opening 460C coincide; wherein, within the second bottom-cut opening 610B, the first main body 63A contacts the side 61B30 of the sixth sub-bottom-cut opening 613B, the first main body 63A contacts the side 61B20 of the fifth sub-bottom-cut opening 612B, and the first main body 63A contacts the side 61B10 of the fourth sub-bottom-cut opening 611B, and within the first bottom... Within the cutout 460C, the connecting portion 63B contacts the side 46C10 of the first conductive layer 46C1 away from the substrate 10, the connecting portion 63B contacts the side 46C20 of the second conductive layer 46C2, and the connecting portion 63B contacts the side 46C30 of the third conductive layer 46C3. This increases the contact area between the connecting portion 63B and the first auxiliary electrode 46C, and increases the contact area between the first main body portion 63A and the second auxiliary electrode 61B, further reducing the impedance of the second electrode layer 63 and thus improving the voltage drop (IR drop) effect of the second electrode layer 63.

[0078] Please combine Figure 5 and Figure 6 ;in, Figure 5 This is a third cross-sectional schematic diagram of the display panel provided in an embodiment of this application; Figure 6 This is a second cross-sectional schematic diagram of the first auxiliary electrode of the display panel provided in an embodiment of this application.

[0079] In this embodiment, the structure of the display panel is similar to / the same as the first structure of the display panel provided in the above embodiments. Please refer to the description of the display panel in the above embodiments for details, which will not be repeated here. The only difference between the two is:

[0080] In this embodiment, the first auxiliary electrode 46C includes a first conductive layer 46C1, a second conductive layer 46C2, and a third conductive layer 46C3 stacked together, with the second conductive layer 46C2 located between the first conductive layer 46C1 and the third conductive layer 46C3; the first conductive layer 46C1 includes a first conductive sub-part 461C1 and a first extension 462C1, the first conductive sub-part 461C1 being connected to the second conductive layer 46C2, and the orthographic projection of the first extension 462C1 onto the substrate 10 intersecting with the second conductive layer 46C2. The orthographic projections of C2 on the substrate 10 do not overlap; the third conductive layer 46C3 includes a second conductive sub-part 461C3 and a second extension 462C3, the second conductive sub-part 461C3 is connected to the second conductive layer 46C2, and the orthographic projections of the second extension 462C3 on the substrate 10 and the second conductive layer 46C2 on the substrate 10 do not overlap; wherein, the first extension 462C1, the side surface of the second conductive layer 46C2 and the second extension 462C3 form the first undercut opening 460C.

[0081] It should be noted that in this embodiment, the light-emitting layer 62 is broken at the first bottom cut opening 460C, and the thickness of the light-emitting layer 62 is less than or equal to the thickness of the first conductive layer 46C1. Preferably, this embodiment uses the example of the thickness of the light-emitting layer 62 being less than the thickness of the first conductive layer 46C1 to illustrate the technical solution of this application.

[0082] Specifically, the orthographic projection of the first conductive sub-part 461C1 on the substrate 10 overlaps with the orthographic projection of the second conductive layer 46C2 on the substrate 10. The third conductive layer 46C3 includes the second conductive sub-part 461C3 and the second extension 462C3. The orthographic projection of the second conductive sub-part 461C3 on the substrate 10 overlaps with the orthographic projection of the second conductive layer 46C2 on the substrate 10. Within the first undercut opening 460C, the second electrode layer 63 is connected to the sidewall of the first extension 462C1 and to the side of the first extension 462C1 away from the substrate 10. The second electrode layer 63 is also connected to the second conductive layer 46C2, and the second conductive layer 46C2 is connected to the sidewall of the second extension 462C3. By using the first auxiliary electrode 46C as a parallel resistor for the second electrode layer 63, the impedance of the second electrode layer 63 is reduced, thereby improving the voltage drop (IR) of the second electrode layer 63. The drop effect helps improve the display quality of the display panel 1; and by using the first auxiliary electrode 46C including the first undercut opening 460C, the additional process steps of setting the undercut opening are saved.

[0083] It should be noted that, in another embodiment, such as Figure 7 The diagram shown is a fourth cross-sectional view of the display panel provided in an embodiment of this application.

[0084] The first electrode layer 61 includes a second auxiliary electrode 61B located in the non-light-emitting region 200. The second auxiliary electrode 61B is located between the first auxiliary electrode 46C and the light-emitting layer 62. The second auxiliary electrode 61B is connected to the first auxiliary electrode 46C. The orthogonal projection of the second auxiliary electrode 61B on the substrate 10 covers the orthogonal projection of the first auxiliary electrode 46C on the substrate 10.

[0085] The second auxiliary electrode 61B includes a second undercut opening 610B corresponding to the first undercut opening 460C. The through hole 620, the second undercut opening 610B, and the first undercut opening 460C are interconnected. The second electrode layer 63 extends from the through hole 620 into the second undercut opening 610B and is connected to the second auxiliary electrode 61B. The second electrode layer 63 extends from the second undercut opening 610B into the first undercut opening 460C and is connected to the first auxiliary electrode 46C. Through the parallel connection of the second auxiliary electrode 61B, the first auxiliary electrode 46C, and the second electrode layer 63, the impedance of the second electrode layer 63 is reduced, thereby further improving the voltage drop (IR drop) effect of the second electrode layer 63, which is beneficial to improving the display quality of the display panel 1. Furthermore, by using the first electrode layer 61 including the second auxiliary electrode 61B, and the second auxiliary electrode 61B including the second undercut opening 610B, process steps are saved.

[0086] This application also provides a method for manufacturing a display panel. Please refer to the embodiments thereof. Figure 2 , Figure 3 , Figure 4 , Figure 8 , Figures 9A to 9G ;in, Figure 8 A flowchart illustrating a method for manufacturing a display panel as provided in an embodiment of this application; Figures 9A to 9G for Figure 8 A flowchart illustrating the structural process of manufacturing the central display panel.

[0087] In this embodiment, the method for manufacturing the display panel 1 includes the following steps:

[0088] Step S100: Provide a substrate 10.

[0089] When the substrate 10 is a rigid substrate, the material can be metal or glass. When the substrate 10 is a flexible substrate, the material can include at least one of acrylic resin, methacrylic resin, polyisoprene, vinyl resin, epoxy resin, polyurethane-based resin, cellulose resin, siloxane resin, polyimide-based resin, and polyamide-based resin.

[0090] Specifically, step S100 further includes forming a light-shielding layer 20 and a buffer layer 30 sequentially on the substrate 10. The material of the light-shielding layer 20 includes, but is not limited to, one or more alloys of molybdenum (Mo), titanium (Ti), and nickel (Ni). The material of the buffer layer 30 includes, but is not limited to, a single layer of silicon nitride (Si3N4), a single layer of silicon dioxide (SiO2), a single layer of silicon oxynitride (SiONx), or a bilayer structure of the above films.

[0091] Step S200: Form a first auxiliary electrode 46C on the substrate 10.

[0092] Specifically, step S200 includes sequentially forming an active layer 41, a gate insulating layer 42, a gate 43, an interlayer insulating layer 44, and a first metal layer 46 on the side of the buffer layer 30 away from the light-shielding layer 20, such as... Figure 9A As shown.

[0093] The first metal layer 46 includes a first conductive layer 46C1, a second conductive layer 46C2, and a third conductive layer 46C3 sequentially stacked on the substrate 10. In this embodiment, the first conductive layer 46C1 is made of molybdenum-titanium alloy (MoTi), the second conductive layer 46C2 is made of copper (Cu), and the third conductive layer 46C3 is made of molybdenum-titanium alloy (MoTi) as examples to illustrate the technical solution of this application.

[0094] Specifically, the first metal layer 46 includes a first auxiliary electrode 46C, a source electrode 46A, and a drain electrode 46B spaced apart. The source electrode 46A and the drain electrode 46B are located within the light-emitting region 100, and the first auxiliary electrode 46C is located within the non-light-emitting region 200. A second groove 460 is formed on the first auxiliary electrode 46C, and the second groove 460 penetrates the first auxiliary electrode 46C. The active layer 41 includes a first conductor portion (not marked in the figure) and a second conductor portion (not marked in the figure), and an active segment (not marked in the figure) located between the first conductor portion and the second conductor portion. The source electrode 46A is connected to the first conductor portion, the drain electrode 46B is connected to the second conductor portion, and the drain electrode 46B is connected to the light-shielding layer 20. The orthographic projection of the gate electrode 43 on the substrate 10 overlaps with the orthographic projection of the active segment on the substrate 10.

[0095] Step S300: A passivation layer 51 is formed on the side of the first auxiliary electrode 46C away from the substrate 10, such as... Figure 9B As shown, the passivation layer 51 covers the first metal layer 46, thereby blocking water and oxygen and providing insulation for the first auxiliary electrode 46C, the source electrode 46A and the drain electrode 46B.

[0096] Step S400: A planarization layer 52 is formed on the side of the passivation layer 51 away from the first auxiliary electrode 46C. The planarization layer 52 is patterned to form a first sub-via (not marked in the figure) on the drain electrode 46B and a third sub-via (not marked in the figure) on the first auxiliary electrode 46C. Both the first sub-via and the third sub-via pass through the planarization layer 52. Figure 9C As shown, the center line W6 of the third sub-hole coincides with the center line W5 of the second groove 460.

[0097] Step S500: The passivation layer 51 is patterned to form a second sub-via (not marked in the figure) exposing a portion of the drain electrode 46B and a fourth sub-via (not marked in the figure) exposing a portion of the first auxiliary electrode 46C. Both the second and fourth sub-vias pass through the planarization layer 52. Figure 9D As shown.

[0098] The second sub-hole is connected to the first sub-hole, and the center line of the second sub-hole coincides with the center line of the first sub-hole. The fourth sub-hole is connected to the third sub-hole, and the center line W7 of the fourth sub-hole, the center line W6 of the third sub-hole, and the center line W5 of the second groove 460 coincide. The diameter of the fourth sub-hole is equal to the diameter of the third sub-hole, and the diameter of the third sub-hole is greater than the width of the second groove 460.

[0099] Step S600: A first electrode layer 61 is formed on the side of the passivation layer 51 away from the planarization layer 52. The first electrode layer 61 includes a second auxiliary electrode 61B located in the non-light-emitting region 200 and a first sub-electrode 61A located in the light-emitting region 100. The second auxiliary electrode 61B passes through the fourth sub-hole and the third sub-hole and is connected to the first auxiliary electrode 46C. The first electrode layer 61 passes through the first sub-hole and the second sub-hole and is connected to the drain electrode 46B.

[0100] The first electrode layer 61 includes a fourth conductive layer 61B1, a fifth conductive layer 61B2, and a sixth conductive layer 61B3 sequentially stacked on the substrate 10. In this embodiment, the fourth conductive layer 61B1 is made of indium tin oxide (ITO), the fifth conductive layer 61B2 is made of silver (Ag), and the sixth conductive layer 61B3 is made of indium tin oxide (ITO) as examples to illustrate the technical solution of this application.

[0101] Specifically, step S600 further includes patterning the second auxiliary electrode 61B and the first auxiliary electrode 46C to form a second undercut opening 610B penetrating the second auxiliary electrode 61B and a first undercut opening 460C penetrating the first auxiliary electrode 46C. The side 4600C of the first auxiliary electrode 46C is exposed in the first undercut opening 460C. The light-emitting layer 62 is disconnected at the second undercut opening 610B, and the second electrode layer 63 is continuously disposed at the second undercut opening 610B, and at least a portion of the second electrode layer 63 is in contact with the side 4600C of the first auxiliary electrode 46C.

[0102] Specifically, in step S600, an etchant can be used to etch the second auxiliary electrode 61B and the first auxiliary electrode 46C to form a pattern, forming a second undercut opening 610B on the second auxiliary electrode 61B and a first undercut opening 460C on the first auxiliary electrode 46C; the center line W4 of the second undercut opening 610B, the center line W7 of the fourth sub-hole, the center line W6 of the third sub-hole, and the center line W1 of the first undercut opening 460C coincide, as shown below. Figure 9E As shown.

[0103] The etching rate of the etchant on the sixth conductive layer 61B3 is greater than that on the fifth conductive layer 61B2, and the etching rate of the etchant on the fifth conductive layer 61B2 is less than that on the fourth conductive layer 61B1. This results in the formation of a fourth sub-bottom cutout 611B on the fourth conductive layer 61B1, a fifth sub-bottom cutout 612B on the fifth conductive layer 61B2, and a sixth sub-bottom cutout 613B on the sixth conductive layer 61B3. These sub-bottom cutouts 611B, 612B, and 613B are interconnected. The diameter of the fourth sub-bottom cutout 611B is smaller than that of the fifth sub-bottom cutout 612B, and the diameter of the sixth sub-bottom cutout 613B is smaller than that of the fifth sub-bottom cutout 612B, thus causing the film layer formed therein to break at the inner wall.

[0104] The etching rate of the etchant on the third conductive layer 46C3 is less than the etching rate of the etchant on the second conductive layer 46C2, and the etching rate of the etchant on the second conductive layer 46C2 is greater than the etching rate of the etchant on the first conductive layer 46C1. This forms a first sub-bottom cut opening 461C on the first conductive layer 46C1, a second sub-bottom cut opening 462C on the second conductive layer 46C2, and a third sub-bottom cut opening 463C on the third conductive layer 46C3. The first sub-bottom cut opening 461C, the second sub-bottom cut opening 462C, and the third sub-bottom cut opening 463C are interconnected. The diameter of the first sub-bottom cut opening 461C is smaller than the diameter of the second sub-bottom cut opening 462C, and the diameter of the third sub-bottom cut opening 463C is smaller than the diameter of the second sub-bottom cut opening 462C. This causes the film layer formed above the first sub-bottom cut opening 461C to break at the first sub-bottom cut opening 461C. The etchant includes, but is not limited to, silver acid etching solution.

[0105] Specifically, the method for manufacturing the display panel 1 further includes the following steps:

[0106] Step S700: A pixel definition layer 70 is formed on the side of the passivation layer 51 away from the planarization layer 52. The pixel definition layer 70 is patterned to form a first slot 70A that exposes the first electrode layer 61 and a second through hole 70B that exposes part of the second auxiliary electrode 61B. The second through hole 70B is connected to the first through hole 50B. The center line W2 of the second through hole 70B, the center line W4 of the second undercut opening 610B, the center line W7 of the fourth sub-hole, the center line W6 of the third sub-hole, and the center line W1 of the first undercut opening 460C coincide.

[0107] Step S800: A light-emitting layer 62 is formed on the side of the first electrode layer 61 away from the pixel definition layer 70. The light-emitting layer 62 is connected to the first sub-electrode 61A through the first slot 70A. The light-emitting layer 62 is disconnected at the second undercut opening 610B. The light-emitting layer 62 includes a through hole 620 corresponding to the second undercut opening 610B. Figure 9F As shown.

[0108] The light-emitting layer 62 includes a second main body portion 62A and a branch portion 62B. The second main body portion 62A is located between the first auxiliary electrode 46C and the first main body portion 63A. The branch portion 62B is located within the first sub-bottom cut-out 461C. The branch portion 62B is disconnected from the second main body portion 62A. The orthographic projection of the connecting portion 63B on the substrate 10 covers the orthographic projection of the branch portion 62B on the substrate 10.

[0109] Step S900: A second electrode layer 63 is formed on the side of the light-emitting layer 62 away from the first electrode layer 61. The second electrode layer 63 is connected to the light-emitting layer 62 through the first slot 70A. The second electrode layer 63 extends from the through hole 620 into the first undercut opening 460C and is connected to the second auxiliary electrode 61B. The second electrode layer 63 extends from the second undercut opening 610B into the first undercut opening 460C and is connected to the first auxiliary electrode 46C. Figure 9G As shown.

[0110] It is understood that by connecting the second auxiliary electrode 61B, the first auxiliary electrode 46C and the second electrode layer 63 in parallel, the impedance of the second electrode layer 63 is reduced, thereby further improving the voltage drop (IR drop) effect of the second electrode layer 63, which is beneficial to improving the display quality of the display panel 1; and by using the first electrode layer 61 to include the second auxiliary electrode 61B, and the second auxiliary electrode 61B to include the second bottom cut opening 610B, the additional process step of setting the first bottom cut opening is saved.

[0111] This embodiment provides a display device, which includes the display panel described in any of the above embodiments.

[0112] It is understood that the display panel has been described in detail in the above embodiments, and will not be repeated here.

[0113] In specific applications, the display device can be the display screen of devices such as smartphones, tablets, laptops, smart bracelets, smartwatches, smart glasses, smart helmets, desktop computers, smart TVs, or digital cameras, and can even be applied to electronic devices with flexible displays.

[0114] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0115] The above provides a detailed description of a display panel, its manufacturing method, and the display device provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A display panel, characterized in that, include: Base; A thin-film transistor layer is disposed on the substrate and includes a source and a drain. A light-emitting device layer is disposed on the side of the thin-film transistor layer away from the substrate, and the light-emitting device layer includes a first electrode layer, a light-emitting layer and a second electrode layer sequentially stacked on the substrate; A first auxiliary electrode is located between the substrate and the light-emitting layer, and the first auxiliary electrode is disposed in the same layer as the source and drain of the thin-film transistor; The first auxiliary electrode includes a first undercut opening that penetrates the first auxiliary electrode, with the side of the first auxiliary electrode exposed within the first undercut opening. The first electrode layer includes a second auxiliary electrode located between the first auxiliary electrode and the light-emitting layer. The second auxiliary electrode includes a second undercut opening corresponding to the first undercut opening that penetrates the second auxiliary electrode, with the side of the second auxiliary electrode exposed within the second undercut opening. The second undercut opening and the first undercut opening are interconnected. The light-emitting layer is discontinuously disposed at the first and second undercut openings, and the second electrode layer is continuously disposed at the first and second undercut openings, with at least a portion of the second electrode layer in contact with the side of the first and second auxiliary electrodes.

2. The display panel according to claim 1, characterized in that, The second electrode layer includes a first main body and a connecting portion. The first main body is located on the side of the first auxiliary electrode away from the substrate, and the connecting portion is located inside the first undercut opening. The connecting portion is in contact with the side of the first auxiliary electrode and is connected to the first main body at the side of the first auxiliary electrode.

3. The display panel according to claim 2, characterized in that, The first auxiliary electrode includes a first conductive layer, a second conductive layer, and a third conductive layer stacked together, with the second conductive layer located between the first conductive layer and the third conductive layer; The first undercut opening includes a first sub-undercut opening disposed on the first conductive layer, a second sub-undercut opening disposed on the second conductive layer, and a third sub-undercut opening disposed on the third conductive layer. The first sub-undercut opening, the second sub-undercut opening, and the third sub-undercut opening are interconnected. The diameters of the first sub-undercut opening and the third sub-undercut opening are both smaller than the diameter of the second sub-undercut opening.

4. The display panel according to claim 3, characterized in that, The light-emitting layer includes a second main body and a branch portion. The second main body is located between the first auxiliary electrode and the first main body. The branch portion is located within the first sub-bottom cut-out. The branch portion is disconnected from the second main body. The orthographic projection of the connecting portion on the substrate covers the orthographic projection of the branch portion on the substrate.

5. The display panel according to claim 4, characterized in that, The branch is located within the first sub-bottom cut opening, and the thickness of the branch is less than or equal to the thickness of the first conductive layer.

6. The display panel according to claim 5, characterized in that, Within the first undercut opening, the connecting portion contacts the side of the first conductive layer away from the substrate, the connecting portion contacts the side of the second conductive layer, and the connecting portion contacts the side of the third conductive layer.

7. The display panel according to claim 1, characterized in that, The second auxiliary electrode is connected to the first auxiliary electrode, and the orthographic projection of the second auxiliary electrode on the substrate covers the orthographic projection of the first auxiliary electrode on the substrate.

8. The display panel according to claim 7, characterized in that, The second auxiliary electrode includes a fourth conductive layer, a fifth conductive layer, and a sixth conductive layer stacked together, wherein the fifth conductive layer is located between the fourth conductive layer and the sixth conductive layer; The first undercut opening includes a fourth sub-undercut opening disposed on the fourth conductive layer, a fifth sub-undercut opening disposed on the fifth conductive layer, and a sixth sub-undercut opening disposed on the sixth conductive layer, wherein the fourth sub-undercut opening, the fifth sub-undercut opening, and the sixth sub-undercut opening are interconnected.

9. The display panel according to claim 1, characterized in that, The first auxiliary electrode includes a first conductive layer, a second conductive layer, and a third conductive layer stacked together, with the second conductive layer located between the first conductive layer and the third conductive layer; The first conductive layer includes a first conductive sub-part and a first extension, the first conductive sub-part is connected to the second conductive layer, and the orthographic projection of the first extension on the substrate does not overlap with the orthographic projection of the second conductive layer on the substrate; the third conductive layer includes a second conductive sub-part and a second extension, the second conductive sub-part is connected to the second conductive layer, and the orthographic projection of the second extension on the substrate does not overlap with the orthographic projection of the second conductive layer on the substrate. The first extension, the side surface of the second conductive layer, and the second extension form the first undercut opening.

10. A method for manufacturing a display panel, characterized in that, Includes the following steps: Provide a base; A first metal layer is formed on the substrate. The first metal layer includes a source electrode, a drain electrode, and a first auxiliary electrode. A first undercut opening is formed on the first auxiliary electrode. The first undercut opening penetrates the first auxiliary electrode, and the side of the first auxiliary electrode is exposed in the first undercut opening. A first electrode layer, a light-emitting layer, and a second electrode layer are sequentially formed on the side of the first auxiliary electrode away from the substrate. The first electrode layer includes a second auxiliary electrode located between the first auxiliary electrode and the light-emitting layer. The second auxiliary electrode includes a second undercut opening corresponding to the first undercut opening, the second undercut opening penetrating the second auxiliary electrode, and the side of the second auxiliary electrode exposed within the second undercut opening. The second undercut opening and the first undercut opening are interconnected. The light-emitting layer is discontinuously disposed at the first undercut opening and the second undercut opening, and the second electrode layer is continuously disposed at the first undercut opening and the second undercut opening, with at least a portion of the second electrode layer in contact with the side of the first auxiliary electrode and the side of the second auxiliary electrode.

11. A display device, characterized in that, The display device includes a display panel as claimed in any one of claims 1-9.

Images