Display panel and electronic terminal

Abstract

The present invention provides a display panel and an electronic terminal, including a substrate, a pixel layer located on the substrate, and an auxiliary electrode layer. The pixel layer includes a plurality of sub-pixels arranged at intervals. Each sub-pixel includes an anode portion, a light-emitting portion located on the anode portion, and a cathode portion located on the light-emitting portion. A plurality of cathode portions are electrically connected to form a cathode layer. The auxiliary electrode layer includes a plurality of auxiliary electrodes corresponding to the plurality of sub-pixels one by one. The auxiliary electrodes are located between two adjacent anode portions. Each auxiliary electrode includes a first undercut opening and a second undercut opening. The cathode portion includes a first cathode portion that is disposed opposite to the corresponding anode portion and extends to overlap and be connected in parallel to the corresponding first undercut opening. Among them, in the present invention, the cathode portions are respectively connected in parallel to different positions of the auxiliary electrodes to form a first cathode portion and a second cathode portion that are overlapped twice, so as to increase the overlapping positions and areas, and further improve the phenomenon of uneven display caused by the voltage drop difference at different positions of the cathode layer.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, in particular to the manufacturing of display devices, specifically to display panels and electronic terminals. Background Art

[0002] An OLED (Organic Light-Emitting Diode) display panel emits light through the injection and recombination of carriers, and has the advantages of being thin and light, high brightness, low power consumption, fast response, high definition, etc.

[0003] Currently, for large-size OLED display panels, the voltage drop problem caused by the cathode with a large area and a small thickness makes the brightness difference between the central region and the edge region of the OLED display panel relatively large. Usually, an inverted trapezoidal isolation column is arranged between the cathode and the auxiliary electrode to connect the cathode and the auxiliary electrode. However, considering that the isolation column with a large volume ratio affects the aperture ratio and packaging of the display panel, the connection positions of the cathode and the auxiliary electrode are set less, resulting in a relatively low connection area and a relatively low probability of successful connection between the cathode and the auxiliary electrode, and the problem of uneven display caused by cathode voltage drop cannot be solved well.

[0004] Therefore, in the existing large-size OLED display panels, the uneven display phenomenon caused by cathode voltage drop due to the small number of connection positions between the cathode and the auxiliary electrode cannot be alleviated well, and improvement is urgently needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a display panel and an electronic terminal to solve the technical problem that the uneven display phenomenon caused by the small number of connection positions between the cathode and the auxiliary electrode in the existing large-size OLED display panels is still relatively serious.

[0006] An embodiment of the present invention provides a display panel, including:

[0007] A substrate;

[0008] A pixel layer, located on the substrate, including a plurality of sub-pixels arranged at intervals, the sub-pixels including an anode portion, a light-emitting portion located on the anode portion, and a cathode portion located on the light-emitting portion, and a plurality of the cathode portions are electrically connected to form a cathode layer;

[0009] An auxiliary electrode layer, located on the substrate, including a plurality of auxiliary electrodes corresponding to the plurality of sub-pixels one by one, the auxiliary electrodes being located between two adjacent anode portions, and the auxiliary electrodes including a first undercut opening and a second undercut opening located on a side of the first undercut opening away from the corresponding anode portion;

[0010] Wherein, the cathode portion includes:

[0011] The first cathode part is disposed opposite to the corresponding anode part and extends to overlap with the corresponding first undercut opening to be connected in parallel to the side of the first undercut opening;

[0012] The second cathode part is spaced from and electrically connected to the first cathode part, and overlaps with the corresponding second undercut opening to be connected in parallel to the side of the second undercut opening.

[0013] In one embodiment, it further includes:

[0014] A circuit layer, located on the substrate;

[0015] A passivation layer, located between the circuit layer and the pixel layer;

[0016] Wherein, the auxiliary electrode is at least located between the passivation layer and the cathode layer, and the second cathode part is located on the auxiliary electrode to be connected in parallel to the auxiliary electrode.

[0017] In one embodiment, the auxiliary electrode includes:

[0018] A first sub-auxiliary electrode, located between the passivation layer and the cathode layer, and the first sub-auxiliary electrode is provided with the first undercut opening;

[0019] A second sub-auxiliary electrode, located under the first sub-auxiliary electrode, and one side of the first sub-auxiliary electrode close to the second sub-auxiliary electrode is electrically connected to the second sub-auxiliary electrode, and forms the second undercut opening to expose the second sub-auxiliary electrode;

[0020] Wherein, the composition material of the second sub-auxiliary electrode 04 includes metal.

[0021] In one embodiment, the circuit layer includes a plurality of transistors, and the transistors include:

[0022] An active layer;

[0023] A source-drain layer, located on the active layer, including a source electrode electrically connected to one side of the active layer and a drain electrode electrically connected to the other side of the active layer, and the source electrode or the drain electrode is electrically connected to the corresponding anode part;

[0024] A gate layer, located on one side of the active layer close to or away from the source-drain layer;

[0025] Wherein, the second sub-auxiliary electrode is arranged on the same layer as the source-drain layer.

[0026] In one embodiment, it further includes:

[0027] A planarization layer, located on the passivation layer, and provided with an opening located between two adjacent anode parts;

[0028] Wherein, the first sub - auxiliary electrode extends from the flat layer through the side of the opening to the passivation layer, and the second cathode portion extends from the first sub - auxiliary electrode and overlaps with the second sub - auxiliary electrode.

[0029] In one embodiment, the first sub - auxiliary electrode includes:

[0030] A first sub - layer, the composition material of the first sub - layer includes molybdenum, titanium, nickel alloy;

[0031] A second sub - layer, located on the first sub - layer, the composition material of the second sub - layer includes aluminum, nickel, copper, rhenium alloy;

[0032] A third sub - layer, located on the second sub - layer, the composition material of the third sub - layer includes indium tin oxide;

[0033] Wherein, the second sub - layer is recessed in the first sub - layer and the third sub - layer to form the first undercut opening.

[0034] In one embodiment, the first sub - auxiliary electrode and the anode portion are arranged in the same layer.

[0035] In one embodiment, there are an adjacent display area and a non - display area, and it further includes:

[0036] A bonding layer, located between the substrate and the pixel layer and in the non - display area, and a plurality of the sub - pixels are located in the display area;

[0037] A bonding protection layer, located on the bonding layer;

[0038] Wherein, the bonding protection layer and the first sub - auxiliary electrode are arranged in the same layer.

[0039] In one embodiment, the light - emitting portion includes:

[0040] A first light - emitting portion, located between the corresponding first cathode portion and the corresponding anode portion;

[0041] A second light - emitting portion, located between the corresponding second cathode portion and the corresponding auxiliary electrode, and is spaced from the first light - emitting portion at the first undercut opening.

[0042] An embodiment of the present invention also provides an electronic terminal, including the display panel as described above in any one.

[0043] The present invention provides a display panel and an electronic terminal, including: a substrate; a pixel layer located on the substrate, including a plurality of sub-pixels arranged at intervals, the sub-pixels including an anode portion, a light-emitting portion located on the anode portion, and a cathode portion located on the light-emitting portion, and a plurality of the cathode portions are electrically connected to form a cathode layer; an auxiliary electrode layer located on the substrate, including a plurality of auxiliary electrodes corresponding to the plurality of sub-pixels one by one, the auxiliary electrodes being located between two adjacent anode portions, and the auxiliary electrode including a first undercut opening and a second undercut opening located on a side of the first undercut opening away from the corresponding anode portion; wherein, the cathode portion includes: a first cathode portion disposed opposite to the corresponding anode portion and extending to overlap with the corresponding first undercut opening to be connected in parallel to a side portion of the first undercut opening; a second cathode portion spaced from the first cathode portion and electrically connected, and overlapping with the corresponding second undercut opening to be connected in parallel to a side portion of the second undercut opening. Among them, the first cathode portion and the second cathode portion in the present invention are respectively connected in parallel to different positions of the auxiliary electrode to form two overlaps, increasing the number of overlapping positions between the cathode layer and the auxiliary electrode to improve the reliability of parallel connection, and increasing the overlapping area between the cathode layer and the auxiliary electrode to reduce the overall impedance, both of which can further improve the phenomenon of uneven display caused by the voltage drop difference at different positions of the cathode layer. Brief Description of the Drawings

[0044] The present invention will be further described below with reference to the accompanying drawings. It should be noted that the drawings in the following description are only used to explain some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

[0045] Figure 1 It is a cross-sectional schematic diagram of the display panel provided by an embodiment of the present invention;

[0046] FIG. 2(a) and FIG. 2(b) are schematic diagrams of the scenario of the manufacturing method of the display panel provided by an embodiment of the present invention. Detailed Embodiments

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "close to", "far from", etc. is based on the orientation or positional relationship shown in the drawings. For example, "upper" only means that the surface is above the object, and specifically refers to directly above, obliquely above, or the upper surface, as long as it is above the horizontal of the object; "both sides" or "both ends" refer to the relative two positions of the object that can be reflected in the drawings, and the two positions can be in direct / indirect contact with the object. The above orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0049] In addition, it should also be noted that the drawings only provide the structures and steps that are relatively closely related to the present invention, and some details that are not closely related to the invention are omitted. The purpose is to simplify the drawings and make the inventive points clear at a glance, rather than indicating that the actual device and method are exactly the same as the drawings, and it is not a limitation to the actual device and method. Figure 1 The present invention provides a display panel, and the display panel includes but is not limited to the following embodiments and combinations of the following embodiments.

[0050]

[0051] Figure 1 In one embodiment, as shown, the display panel 100 includes: a substrate 10; a pixel layer located on the substrate 10, including a plurality of sub-pixels 20 arranged at intervals, the sub-pixels 20 including an anode portion 201, a light-emitting portion 202 located on the anode portion 201, and a cathode portion 203 located on the light-emitting portion 202, and a plurality of the cathode portions 203 are electrically connected to form a cathode layer; an auxiliary electrode layer located on the substrate 10, including a plurality of auxiliary electrodes 30 corresponding to the plurality of sub-pixels 20 one by one, the auxiliary electrodes 30 are located between two adjacent anode portions 201, and the auxiliary electrodes 30 include a first undercut opening 301 and a second undercut opening 302 located on a side of the first undercut opening 301 away from the corresponding anode portion 201; wherein, the cathode portion 203 includes: a first cathode portion 01, which is disposed opposite to the corresponding anode portion 201 and extends to overlap with the corresponding first undercut opening 301 to be connected in parallel to a side of the first undercut opening 301; a second cathode portion 02, which is spaced apart from and electrically connected to the first cathode portion 01, and overlaps with the corresponding second undercut opening 302 to be connected in parallel to a side of the second undercut opening 302.

[0052] Among them, the substrate 10 is used to carry the film layer disposed thereon. Specifically, the substrate 10 can be a rigid substrate or a flexible substrate. The constituent materials of the rigid substrate can include single-layer insulating materials such as glass, quartz, and polymer resin, or multi-layer insulating materials such as double-layer polymer resin. The constituent materials of the flexible substrate can include, but are not limited to, polyimide. Among them, in this embodiment, the specific material of the auxiliary electrode 30 is not limited, as long as the auxiliary electrode 30 is a conductor.

[0053] Among them, a plurality of anode portions 201 can be arranged at intervals and insulated. Each anode portion 201 can be loaded with a corresponding anode voltage. The plurality of anode portions 201 can be connected together for electrical connection to form a cathode layer. The cathode layer can be loaded with a cathode voltage. For example, two adjacent anode portions 201 can be connected to the corresponding two sub-pixels 20 for integral molding. Specifically, in combination with the above discussion, each light-emitting portion 202 emits corresponding light under the action of the driving current generated under the action of the corresponding anode voltage of the corresponding anode portion 201 and the cathode voltage of the cathode layer, so as to realize the display of the picture. It should be noted that in the same sub-pixel 20, although the first cathode portion 01 and the second cathode portion 02 in the corresponding cathode portion 203 are arranged at intervals, the two can be electrically connected at the edge of the display panel 100 or through electrical connection with the cathode portions 203 in other sub-pixels 20.

[0054] It can be understood that in this embodiment, the electrically connected first cathode portion 01 and second cathode portion 02 are arranged at intervals in the corresponding sub-pixel 20, and the first cathode portion 01 is lapped and connected in parallel to the side of the first undercut opening 301 on the auxiliary electrode 30, and the second cathode portion 02 is lapped and connected in parallel to the side of the second undercut opening 302 on the auxiliary electrode 30. That is, the first cathode portion 01 and the second cathode portion 02 can be respectively connected in parallel to different positions of the auxiliary electrode 30 to form two lappings. On the one hand, the number of lapping positions between the cathode layer and the auxiliary electrode is increased, so that when one lapping position is disconnected, the other lapping position can still maintain the lapping, improving the reliability of the lapping between the cathode layer and the auxiliary electrode. On the other hand, the lapping area between the cathode layer and the auxiliary electrode is also increased, further reducing the overall impedance after the electrical connection between the cathode layer and the auxiliary electrode. Therefore, the above two aspects can further improve the phenomenon of uneven display caused by the voltage drop difference at different positions of the cathode layer.

[0055] In one embodiment, such as Figure 1As shown, the light-emitting part 202 includes: a first light-emitting part 2021 located between the corresponding first cathode part 01 and the corresponding anode part 201; a second light-emitting part 2022 located between the corresponding second cathode part 02 and the corresponding auxiliary electrode 30, and spaced from the first light-emitting part 2021 at the first undercut opening 301. Specifically, in combination with the above discussion, the first light-emitting part 2021 provided between the first cathode part 01 and the anode part 201 emits corresponding light under the action of the driving current generated under the action of the corresponding anode voltage of the corresponding anode part 201 and the cathode voltage of the cathode layer, so as to realize the display of the picture.

[0056] Among them, in combination with the above discussion, the first cathode part 01 and the second cathode part 02 can be arranged in the same layer with the same material. Further, at the position corresponding to the corresponding second cathode part 02, a second light-emitting part 2022 arranged in the same layer with the same material as the first light-emitting part 2021 can also be provided. The first light-emitting part 2021 and the second light-emitting part 2022 can be spaced at the first undercut opening 301. It can be understood that in this embodiment, for multiple light-emitting parts 202 connected to form a whole layer, by setting the first undercut opening 301, the light-emitting part 202 can be divided to form a first light-emitting part 2021 and a second light-emitting part 2022 arranged at intervals, so that the second light-emitting part 2022 is disconnected from the first light-emitting part 2021, avoiding the problem that the second light-emitting part 2022 cannot have a driving current because it is not arranged opposite to the anode part 201, but is electrically connected to the first light-emitting part 2021, resulting in a lower brightness of the light emitted by the first light-emitting part 2021 and a lower brightness of the sub-pixel 20 presented, improving the reliability of the brightness of the display picture of the display panel 100. Or rather, in this embodiment, by setting the first undercut opening 301, it is possible to avoid adding a process to remove the first light-emitting part 2021. It should be noted that in the later process of forming the cathode layer, an appropriate evaporation angle can be set or a sputtering process can be used but is not limited to it so that the cathode layer can overlap the auxiliary electrode 30.

[0057] In one embodiment, as Figure 1As shown, the display panel 100 further includes: a circuit layer located on the substrate 10; a passivation layer 40 located between the circuit layer and the pixel layer; wherein, the auxiliary electrode 30 is at least located between the passivation layer 40 and the cathode layer, and the second cathode portion 02 is located on the auxiliary electrode 30 and is connected in parallel with the auxiliary electrode 30. Specifically, in combination with the above discussion, multiple sub-pixels 20 in the pixel layer can be electrically connected to the circuit layer through openings in the passivation layer 40. Further, the anode portion 201 in the sub-pixel 20 can be electrically connected to the circuit layer through an opening in the passivation layer 40 to be loaded with a corresponding anode voltage. Among them, the passivation layer 40 can be used to insulate multiple conductive structures on the side of the circuit layer close to the pixel layer. The composition materials of the passivation layer 40 can include, but are not limited to, inorganic insulating substances such as silicon oxide, silicon nitride, silicon oxynitride, hafnium oxide, aluminum oxide, titanium oxide, tantalum oxide, zinc oxide, etc.

[0058] Specifically, in this embodiment, the relative positions of the auxiliary electrode 30 and the sub-pixel 20 in the vertical direction are not limited. The cathode layer is located above the auxiliary electrode 30 to facilitate the lap joint between the two. Further, in combination with the above discussion, the first cathode portion 01 is lapped and connected in parallel to the side of the first undercut opening 301 on the auxiliary electrode 30, and the second cathode portion 02 is lapped and connected in parallel to the side of the second undercut opening 302 on the auxiliary electrode 30. Further, the second cathode portion 02 in this embodiment is located on the upper surface of the auxiliary electrode 30 and is connected in parallel with the auxiliary electrode 30, that is, it can be considered that the second cathode portion 02 extends from the second undercut opening 302 to cover the upper surface of the auxiliary electrode 30, further increasing the lap joint area of the second cathode portion 02, thereby increasing the area of the cathode layer, and further reducing the overall impedance after the cathode layer and the auxiliary electrode 30 are electrically connected, which can further improve the phenomenon of uneven display caused by the voltage drop difference at different positions of the cathode layer.

[0059] In one embodiment, as Figure 1 shown, the auxiliary electrode 30 includes: a first sub-auxiliary electrode 03 located between the passivation layer 40 and the cathode layer, and the first sub-auxiliary electrode 03 is provided with the first undercut opening 301; a second sub-auxiliary electrode 04 located under the first sub-auxiliary electrode 03, and the side of the first sub-auxiliary electrode 03 close to the second sub-auxiliary electrode 04 is electrically connected to the second sub-auxiliary electrode 04, and forms the second undercut opening 302 to expose the second sub-auxiliary electrode 04; wherein, the composition material of the second sub-auxiliary electrode 04 includes metal.

[0060] Specifically, in this embodiment, the constituent material of the second sub - auxiliary electrode 04 disposed in a different layer from the first sub - auxiliary electrode 03 may include a metal to have relatively high electrical conductivity, and may be loaded with the same signal as the cathode signal to increase the intensity of the cathode signal and slow down the attenuation of the cathode signal. It can be understood that, based on the first sub - auxiliary electrode 03 in this embodiment, adding a second sub - auxiliary electrode 04 electrically connected to the first sub - auxiliary electrode 03 facilitates signal loading and transmission, and can further reduce impedance, further alleviating the attenuation of the cathode signal.

[0061] It should be noted that when the auxiliary electrode 30 includes the first sub - auxiliary electrode 03 and the second sub - auxiliary electrode 04, the second sub - auxiliary electrode 04 may be set to be recessed from the first sub - auxiliary electrode 03 at the connection between the first sub - auxiliary electrode 03 and the second sub - auxiliary electrode 04 to form a second undercut opening 302, or as Figure 1 shown, a passivation layer 40 may be disposed between the second sub - auxiliary electrode 04 and the first sub - auxiliary electrode 03, and the passivation layer 40 is set to be recessed from the first sub - auxiliary electrode 03 to form a second undercut opening 302; of course, when the second sub - auxiliary electrode 04 is not included, a second undercut opening 302 may also be provided on the side of the first sub - auxiliary electrode 03 away from the anode portion 201.

[0062] In one embodiment, as Figure 1 shown, the circuit layer includes a plurality of transistors 50. The transistors 50 include: an active layer 501; a source - drain layer located on the active layer 501, including a source electrode 502 electrically connected to one side of the active layer 501 and a drain electrode 503 electrically connected to the other side of the active layer 501, and the source electrode 502 or the drain electrode 503 is electrically connected to the corresponding anode portion 201; a gate layer 504 located on one side of the active layer 501 close to or away from the source - drain layer; wherein, the second sub - auxiliary electrode 04 is disposed in the same layer as the source - drain layer.

[0063] Among them, in this embodiment, there is no limitation on whether the gate layer 504 is located on the side of the active layer 501 close to or far from the source-drain layer, that is, the transistor 50 can be a top-gate structure or a bottom-gate structure. Here, an example is given where the gate layer 504 is located on the side of the active layer 501 close to the source-drain layer to form a top-gate structure. Specifically, the transistor 50 may further include a gate insulating layer 505 between the gate layer 504 and the active layer 501 to insulate the two. Further, both sides of the active layer 501 electrically connected to the source-drain layer may be doped with ions to form two doped regions 5011. The two doped regions 5011 are connected through a channel region 5012. The doped region 5011 is a region with conductivity, and compared with the channel region 5012, it can have higher conductivity and lower resistance. Further, an interlayer insulating layer 60 may be provided on the active layer 501, the gate insulating layer 505, and the gate layer 504. The side of the interlayer insulating layer 60 close to the source-drain layer may be planar, and the source-drain layer may be electrically connected to the active layer 501 through an opening provided on the interlayer insulating layer 60. Further, the display panel 100 may further include a light-shielding layer 901 located on the substrate 10 and at least opposite to the active layer 501, and a buffer layer 902 located on the light-shielding layer 901 and the substrate 10. The interlayer insulating layer 60 is located on the buffer layer 902. Further, the source electrode 502 or the drain electrode 503 may be electrically connected to the light-shielding layer 901 through the interlayer insulating layer 60 and the buffer layer 902 provided with an opening for electrostatic discharge.

[0064] Specifically, the constituent material of the active layer 501 may include metal oxides, which may be but are not limited to IGZO, IZTO, and IGZTO. The constituent materials of the gate layer 504 and the source-drain may each include but are not limited to at least one of molybdenum, aluminum, platinum, palladium, silver, magnesium, gold, nickel, neodymium, iridium, chromium, calcium, titanium, tantalum, tungsten, and copper. The constituent material of the gate insulating layer 505 may include but is not limited to silicon compounds and metal oxides. The interlayer insulating layer may include silicon compounds, metal oxides, etc. The constituent material of the interlayer insulating layer 60 may include but is not limited to at least one of silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, tantalum oxide, hafnium oxide, zirconium oxide, and titanium oxide. The constituent material of the light-shielding layer 901 may include but is not limited to an alloy of molybdenum, titanium, copper, manganese, or other metals. The constituent materials of the gate insulating layer 505 and the buffer layer 902 may include at least one of silicon oxide and silicon nitride, for example, it may include a silicon oxide layer and a silicon nitride layer.

[0065] It can be understood that, in combination with the above discussion, the constituent material of the second sub auxiliary electrode 04 includes metal. In this embodiment, the second sub auxiliary electrode 04 is arranged on the same layer as the source-drain layer made of metal. Further, the second sub auxiliary electrode 04 and the source-drain layer may be made of the same material simultaneously, which can save the manufacturing process and improve the manufacturing efficiency of the display panel 100.

[0066] In one embodiment, as Figure 1 shown, the display panel 100 further includes: a planarization layer 70, located on the passivation layer 40, having an opening 701 located between two adjacent anode portions 201; wherein, the first sub auxiliary electrode 03 extends from the planarization layer 70 to the passivation layer 40 through the side of the opening 701, and the second cathode portion 02 extends from the first sub auxiliary electrode 03 to overlap with the second sub auxiliary electrode 04. Specifically, the thickness of the planarization layer 70 can be set to be relatively large to form a flat surface for providing a flat surface for the deposition of the anode portion 201. The composition material of the planarization layer 70 can include, but is not limited to, inorganic insulating substances, organic insulating substances, or photosensitive substances.

[0067] It can be understood that, in combination with the above discussion, the second sub auxiliary electrode 04 is located under the first sub auxiliary electrode 03. In this embodiment, an opening 701 located between two adjacent anode portions 201 is provided on the passivation layer 40, providing a path for the electrical connection between the second sub auxiliary electrode 04 and the first sub auxiliary electrode 03. At the same time, based on the fact that the second cathode portion 02 is located on the auxiliary electrode 30, since the second sub auxiliary electrode 04 has lower impedance and better conductivity, the second cathode portion 02 can also extend towards the opening 701 to be connected to the second sub auxiliary electrode 04. Moreover, since the first sub auxiliary electrode 03 also overlaps with the first cathode portion 01, that is, in each sub pixel 20, the first cathode portion 01 can also be electrically connected to the second sub auxiliary electrode 04 and the second cathode portion 02 through the first sub auxiliary electrode 03, so as to shorten the electrical connection path between the first cathode portion 01 and the second cathode portion 02 and improve the reliability of the electrical connection.

[0068] In one embodiment, as Figure 1 shown, the first sub auxiliary electrode 03 includes: a first sub layer 031, the composition material of the first sub layer 031 includes molybdenum, titanium, nickel alloy; a second sub layer 032, located on the first sub layer 031, the composition material of the second sub layer 032 includes aluminum, nickel, copper, rhenium alloy; a third sub layer 033, located on the second sub layer 032, the composition material of the third sub layer 033 includes indium tin oxide; wherein, the second sub layer 032 is recessed in the first sub layer 031 and the third sub layer 033 to form the first undercut opening 301.

[0069] Specifically, the entire layer of the first sub-film, the second sub-film, and the third sub-film can be deposited in sequence first, and then the first sub-film, the second sub-film, and the third sub-film can be etched to form the first sub-layer 031, the second sub-layer 032, and the third sub-layer 033. The etching rate of the second sub-film can be set to be the maximum to achieve that the second sub-layer 032 is recessed from the first sub-layer 031 and the third sub-layer 033, thereby forming the first undercut opening 301. Further, the third sub-film can be etched with oxalic acid first, and then the first sub-film and the second sub-film can be etched with a mixture of three acids, namely phosphoric acid, nitric acid, and acetic acid. Generally, the etching rate of oxalic acid is less than that of the mixture of the three acids, and since the etching rate of the mixture of the three acids for the second sub-film is greater than that for the third sub-film, to form the first sub-layer 031, the second sub-layer 032, and the third sub-layer 033 as shown in Figure 1 shown.

[0070] In an embodiment, as shown in Figure 1 shown, the first sub auxiliary electrode 03 and the anode part 201 are arranged on the same layer. Among them, in combination with the above discussion, the anode part 201 can be arranged on the flat area in the flat layer 70, and the first sub auxiliary electrode 03 can extend from the flat area in the flat layer 70 into the opening 701 of the flat layer 70, that is, the first sub auxiliary electrode 03 and the anode part 201 can be formed after the flat layer 70. In this embodiment, the first sub auxiliary electrode 03 and the anode part 201 are arranged on the same layer. Further, the first sub auxiliary electrode 03 and the anode part 201 can be arranged on the same layer with the same material to save the manufacturing process and improve the manufacturing efficiency of the display panel 100.

[0071] Specifically, for example, the first sub auxiliary electrode 03 includes the first sub-layer 031, the second sub-layer 032, and the third sub-layer 033, and the anode part 201 can also be set to include the first anode layer 05 arranged on the same layer as the first sub-layer 031, the second anode layer 06 arranged on the same layer as the second sub-layer 032, and the third anode layer 07 arranged on the same layer as the third sub-layer 033. The composition material of the first anode layer 05 can be the same as that of the first sub-layer 031, the composition material of the second anode layer 06 can be the same as that of the second sub-layer 032, and the composition material of the third anode layer 07 can be the same as that of the third sub-layer 033. Further, the display panel 100 can further include a pixel definition layer located on the flat layer 70. The pixel definition layer can include a plurality of pixel definition parts 80 corresponding to the anode part 201 one by one. The pixel definition part 80 can include two sub-pixel definition parts 801 located on both sides of the corresponding first light-emitting part 2021 and on the anode part 201. The sub-pixel definition part 801 can extend from the anode part 201 to the flat layer 70 to provide a light-emitting microcavity for the corresponding first light-emitting part 2021.

[0072] Further, for the sub-pixel 20 that is not the closest to the boundary of the display panel 100, a first sub auxiliary electrode 03 may also be formed on the side of the adjacent opening 701 away from the boundary of the display panel 100, a sub-pixel defining part 801 extending from the first sub auxiliary electrode 03 to the planarization layer 70, a second light emitting part 2022 extending from the sub-pixel defining part 801 to the side part of the opening 701, and a second cathode part 02.

[0073] In an embodiment, as Figure 1 shown, there are an adjacent display area 08 and a non-display area 09, and it further includes: a bonding layer 802, located between the substrate 10 and the pixel layer and in the non-display area 09, and a plurality of the sub-pixels 20 are located in the display area 08; a bonding protection layer 803, located on the bonding layer 802; wherein, the bonding protection layer 803 and the first sub auxiliary electrode 03 are arranged in the same layer. The bonding layer 802 can be electrically connected to the circuit layer and the driving chip to load the signal generated by the driving chip onto the circuit layer. Further, the bonding layer 802 and the source-drain layer in the circuit layer are arranged in the same layer. Still further, the bonding layer 802 and the source-drain layer in the circuit layer can be formed of the same material through the same process.

[0074] It can be understood that, in combination with the above discussion, the composition material of the bonding layer 802 may include metal. Based on this, in this embodiment, a bonding protection layer 803 is covered on the bonding layer 802, and the bonding protection layer 803 and the first sub auxiliary electrode 03 can be arranged in the same layer, that is, the bonding protection layer 803 and the first sub auxiliary electrode 03 can be formed of the same material simultaneously. The bonding protection layer 803 may include a first sub bonding protection layer 11, a second sub bonding protection layer 12 located on the first sub bonding protection layer 11, and a third sub bonding protection layer 13 located on the second sub bonding protection layer 12. Among them, the composition material of the first sub bonding protection layer 11 may be the same as that of the first sub layer 031, the composition material of the second sub bonding protection layer 12 may be the same as that of the second sub layer 032, and the composition material of the second sub bonding protection layer 12 may be the same as that of the third sub layer 033.

[0075] The present invention also provides a method for manufacturing a display panel for manufacturing the display panel described in any of the above. Combining the schematic diagram of the method for manufacturing the display panel shown in FIGS. 2(a) and 2(b), the method for manufacturing the display panel may include but is not limited to the following steps and combinations of the following steps.

[0076] Step 1, form a light shielding layer 901, a buffer layer 902, an active layer 501, a gate insulating layer 505, a gate layer 504, an interlayer insulating layer 60, a second sub auxiliary electrode 04, a bonding layer 802, a source-drain layer, and a passivation film 401 on the substrate 10.

[0077] Among them, the light-shielding layer 901, the buffer layer 902, the active layer 501, the gate insulating layer 505, the gate layer 504, the interlayer insulating layer 60, the second sub auxiliary electrode 04, the bonding layer 802, and the source-drain layer can refer to the relevant descriptions above. The source-drain layer includes a source electrode 502 and a drain electrode 503. Specifically, the substrate 10 can be cleaned first and then the light-shielding layer 901 and the buffer layer 902 are formed; a metal oxide semiconductor material can be deposited first as a semiconductor layer, and then a gate insulating film and a gate film are deposited in sequence. Then, using a yellow light process, the gate layer 504 is etched first, and then the gate insulating layer 505 is etched using the gate layer 504 as self-alignment, so that the gate insulating layer 505 only exists under the gate layer 504; further, the whole surface can be subjected to plasma treatment to significantly reduce the resistance of the two sides of the semiconductor layer that are not covered by the gate insulating layer 505 and the gate layer 504 to form two doping regions 5011, and the middle region of the semiconductor layer covered by the gate insulating layer 505 and the gate layer 504 is used as the channel region 5012; further, after the interlayer insulating layer 60 is formed, vias, corresponding openings on the buffer layer 902, and openings in the interlayer insulating layer 60 corresponding to the two doping regions 5011 can be formed through the yellow light process. The second sub auxiliary electrode 04, the bonding layer 802, and the source-drain layer can be formed by yellow light and etching; the passivation film 401 can be deposited as a whole layer.

[0078] Step 2: Form a patterned planarization layer 70 on the passivation film 401, including a first opening 1001 disposed opposite to the second sub auxiliary electrode 04 and a second opening 1002 disposed opposite to the drain electrode 503.

[0079] Among them, the planarization layer 70 can refer to the relevant descriptions above, and the first opening 1001 can refer to the relevant descriptions of the opening 701 above.

[0080] Step 3: Use the patterned planarization layer 70 as a mask to pattern the passivation film 401 to form a passivation layer 40, and form a first sub auxiliary electrode 03, an anode portion 201, and a bonding protection layer 803 on the planarization layer 70.

[0081] Among them, the passivation layer 40, the first sub - auxiliary electrode 03, the anode part 201, and the bonding protection layer 803 can refer to the relevant descriptions above. Specifically, based on "the first sub - auxiliary electrode 03 includes: a first sub - layer 031, the constituent material of the first sub - layer 031 includes molybdenum, titanium, nickel alloy; a second sub - layer 032, located on the first sub - layer 031, the constituent material of the second sub - layer 032 includes aluminum, nickel, copper, rhenium alloy; a third sub - layer 033, located on the second sub - layer 032, the constituent material of the third sub - layer 033 includes indium tin oxide", "the anode part 201 can also be set to include a first anode layer 05 arranged on the same layer as the first sub - layer 031, a second anode layer 06 arranged on the same layer as the second sub - layer 032, a third anode layer 07 arranged on the same layer as the third sub - layer 033, the constituent material of the first anode layer 05 can be the same as the constituent material of the first sub - layer 031, the constituent material of the second anode layer 06 can be the same as the constituent material of the second sub - layer 032, and the constituent material of the third anode layer 07 can be the same as the constituent material of the third sub - layer 033", and "the bonding protection layer 803 can include a first sub - bonding protection layer 11, a second sub - bonding protection layer 12 located on the first sub - bonding protection layer 11, and a third sub - bonding protection layer 13 located on the second sub - bonding protection layer 12. Among them, the constituent material of the first sub - bonding protection layer 11 can be the same as the constituent material of the first sub - layer 031, the constituent material of the second sub - bonding protection layer 12 can be the same as the constituent material of the second sub - layer 032, and the constituent material of the second sub - bonding protection layer 12 can be the same as the constituent material of the third sub - layer 033", molybdenum, titanium, nickel alloy film and aluminum, nickel, copper, rhenium alloy film can be deposited in sequence first, then enter a separate chamber for vacuum oxidation, then deposit indium tin oxide film, then perform a yellow light process and etching. The etching includes first using oxalic acid to etch the indium tin oxide film to form the third sub - layer 033, the third anode layer 07, and the third sub - bonding protection layer 13, and then using a mixture of phosphoric acid, nitric acid, and acetic acid to etch the molybdenum, titanium, nickel alloy film and aluminum, nickel, copper, rhenium alloy film to form the first sub - layer 031, the second sub - layer 032, the first anode layer 05, the second anode layer 06, the first sub - bonding protection layer 11, and the second sub - bonding protection layer 12, that is, the first undercut opening 301 is formed. Further, through a thermal baking process, the third sub - layer 033, the third anode layer 07, and the third sub - bonding protection layer 13 are made crystal - dense.

[0082] Step 4, form a pixel definition layer on the planar layer 70, the first sub - auxiliary electrode 03, and the anode part 201.

[0083] Among them, the pixel definition layer can include a plurality of sub - pixel definition parts 801, and the sub - pixel definition part 801 can refer to the relevant descriptions above. Specifically, the thickness of the pixel definition layer can be 10000 Å to 20000 Å, and a patterned pixel definition layer can be formed through a yellow light process.

[0084] Step 5: Use hydrofluoric acid wet etching to etch the passivation layer 40 to form a second undercut opening 302 with the second sub - auxiliary electrode 04 and the first sub - auxiliary electrode 03, and sequentially form a light - emitting portion 202 and a cathode layer on the anode portion 201.

[0085] Among them, the second undercut opening 302, the light - emitting portion 202, and the cathode layer can refer to the relevant descriptions above. Specifically, by controlling the evaporation angle, the light - emitting portion 202 can be disconnected from the second undercut opening 302 and the first undercut opening 301 to form a first light - emitting portion 2021 and two second light - emitting portions 2022 arranged at intervals. Further, by adjusting the evaporation angle or using a sputtering process, a cathode layer including a first cathode portion 01 lapping on the first undercut opening 301 and a second cathode portion 02 lapping on the second undercut opening 302 can be formed.

[0086] The present invention also provides an electronic terminal, including the display panel described in any of the above.

[0087] The present invention provides a display panel and an electronic terminal, including: a substrate; a pixel layer located on the substrate, including a plurality of sub - pixels arranged at intervals, the sub - pixels including an anode portion, a light - emitting portion located on the anode portion, and a cathode portion located on the light - emitting portion, and a plurality of the cathode portions are electrically connected to form a cathode layer; an auxiliary electrode layer located on the substrate, including a plurality of auxiliary electrodes corresponding to the plurality of sub - pixels one by one, the auxiliary electrodes being located between two adjacent anode portions, the auxiliary electrodes including a first undercut opening and a second undercut opening located on a side of the first undercut opening away from the corresponding anode portion; wherein, the cathode portion includes: a first cathode portion, disposed opposite to the corresponding anode portion and extending to lap on the corresponding first undercut opening to be connected in parallel to the side of the first undercut opening; a second cathode portion, spaced from the first cathode portion and electrically connected, and lapping on the corresponding second undercut opening to be connected in parallel to the side of the second undercut opening. Among them, the first cathode portion and the second cathode portion in the present invention are respectively connected in parallel to different positions of the auxiliary electrode to form two laps, increasing the number of lap positions between the cathode layer and the auxiliary electrode to improve the reliability of the parallel connection, and increasing the lap area between the cathode layer and the auxiliary electrode to reduce the overall impedance, both of which can further improve the phenomenon of display unevenness caused by the voltage drop difference at different positions of the cathode layer.

[0088] The above has introduced in detail the display panel and the electronic terminal provided by the embodiments of the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present invention; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that, Comprising: Substrate; Pixel layer, located on the substrate, including a plurality of sub-pixels arranged at intervals, the sub-pixels including an anode portion, a light-emitting portion located on the anode portion, and a cathode portion located on the light-emitting portion, and a plurality of the cathode portions are electrically connected to form a cathode layer; Auxiliary electrode layer, located on the substrate, including a plurality of auxiliary electrodes corresponding to the plurality of sub-pixels one by one, the auxiliary electrodes being located between two adjacent anode portions, the auxiliary electrodes including a first undercut opening and a second undercut opening located on a side of the first undercut opening away from the corresponding anode portion; Wherein, the cathode portion includes: A first cathode portion, disposed opposite to the corresponding anode portion and extending to overlap with the corresponding first undercut opening to be connected in parallel to the side of the first undercut opening; A second cathode portion, spaced from the first cathode portion and electrically connected, and overlapping with the corresponding second undercut opening to be connected in parallel to the side of the second undercut opening; Wherein, the auxiliary electrode includes: A first sub-auxiliary electrode, the first sub-auxiliary electrode being provided with the first undercut opening; A second sub-auxiliary electrode, located under the first sub-auxiliary electrode, a side of the first sub-auxiliary electrode close to the second sub-auxiliary electrode being electrically connected to the second sub-auxiliary electrode, and forming the second undercut opening to expose the second sub-auxiliary electrode.

2. The display panel according to claim 1, wherein Further comprising: Circuit layer, located on the substrate; Passivation layer, located between the circuit layer and the pixel layer; Wherein, the auxiliary electrode is at least located between the passivation layer and the cathode layer, and the second cathode portion is located on the auxiliary electrode to be connected in parallel to the auxiliary electrode.

3. The display panel according to claim 2, wherein The first sub-auxiliary electrode is located between the passivation layer and the cathode layer, and the constituent material of the second sub-auxiliary electrode includes metal.

4. The display panel according to claim 3, wherein The circuit layer includes a plurality of transistors, and the transistors include: Active layer; Source-drain layer, located on the active layer, including a source electrode electrically connected to one side of the active layer and a drain electrode electrically connected to the other side of the active layer, and the source electrode or the drain electrode is electrically connected to the corresponding anode portion; Gate layer, located on a side of the active layer close to or away from the source-drain layer; Wherein, the second sub-auxiliary electrode is provided on the same layer as the source-drain layer.

5. The display panel according to claim 3, characterized in that Further comprising: Flat layer, located on the passivation layer, provided with an opening between two adjacent anode portions; Wherein, the first sub-auxiliary electrode extends from the flat layer through the side of the opening to the passivation layer, and the second cathode portion extends from the first sub-auxiliary electrode to overlap with the second sub-auxiliary electrode.

6. The display panel according to any one of claims 1 to 5, characterized in that The first sub-auxiliary electrode includes: A first sub-layer, the constituent material of the first sub-layer including molybdenum, titanium, nickel alloy; A second sub-layer, located on the first sub-layer, the constituent material of the second sub-layer including aluminum, nickel, copper, rhenium alloy; A third sub-layer, located on the second sub-layer, the constituent material of the third sub-layer including indium tin oxide; Wherein, the second sub-layer is recessed from the first sub-layer and the third sub-layer to form the first undercut opening.

7. The display panel according to claim 6, wherein The first sub-auxiliary electrode is provided on the same layer as the anode portion.

8. The display panel according to claim 6, wherein It has an adjacent display area and non-display area, and further includes: A bonding layer, located between the substrate and the pixel layer and in the non-display area, and a plurality of the sub-pixels are located in the display area; A bonding protection layer, located on the bonding layer; Wherein, the bonding protection layer and the first sub auxiliary electrode are arranged in the same layer.

9. The display panel according to any one of claims 1 to 5, characterized in that, The light-emitting part includes: A first light-emitting part, located between the corresponding first cathode part and the corresponding anode part; A second light-emitting part, located between the corresponding second cathode part and the corresponding auxiliary electrode, and is spaced from the first light-emitting part at the first undercut opening.

10. An electronic terminal, characterized in that, It includes the display panel according to any one of claims 1 to 9.

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