Display panel and display device

Abstract

To upgrade the performance of a display panel.SOLUTION: A display panel includes a substrate, a pixel circuit layer, a light emitting element, and an auxiliary electrode. The pixel circuit layer is formed on one side of the substrate and includes a pixel circuit. The pixel circuit includes an initiation transistor. An active layer of the initiation transistor includes a channel area, and a first electrode area and a second electrode area located on both sides of the channel area. The light emitting element is disposed on the side of the pixel circuit layer away from the substrate, and is electrically connected to the pixel circuit. The light emitting element includes a first electrode, a light emitting material layer, and a second electrode which are layered. The auxiliary electrode is disposed on the side of the pixel circuit layer away from the substrate, and is electrically connected to the second electrode. The auxiliary electrode is connected to the second electrode area of the active layer of the initiation transistor through a via hole.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present application relates to the field of display technology, and in particular to display panels and display devices. [Background technology]

[0002] With the development of display technology, people's requirements for display panels are increasing, and the performance of display panels needs to be further improved. Summary of the Invention [Problem to be solved by the invention]

[0003] The present application provides a display panel and a display device that can improve the performance of the display panel. [Means for solving the problem]

[0004] A first aspect of an embodiment of the present application provides a display panel, the display panel including a substrate, a pixel circuit layer, a light-emitting element, and an auxiliary electrode, the pixel circuit layer being provided on one side of the substrate and including a pixel circuit, the pixel circuit including an initialization transistor, an active layer of the initialization transistor including a channel region and a first electrode region and a second electrode region located on both sides of the channel region, the light-emitting element being disposed on a side of the pixel circuit layer away from the substrate and electrically connected to the pixel circuit, the light-emitting element including a first electrode, a light-emitting material layer, and a second electrode stacked together, the auxiliary electrode being disposed on a side of the pixel circuit layer away from the substrate and electrically connected to the second electrode, and the auxiliary electrode being connected to the second electrode region of the active layer of the initialization transistor through a via hole.

[0005] A second aspect of an embodiment of the present application provides a display device, the device including the display panel described above.

[0006] The beneficial effects of the present application are as follows: In the present application, an auxiliary electrode is provided, and the auxiliary electrode is electrically connected to the second electrode region of the active layer of the first initialization transistor through the first via hole, that is, the auxiliary electrode is directly used to initialize the pixel circuit, thereby optimizing the wiring space, improving the light transmittance, and improving the performance of the display panel. [Brief description of the drawings]

[0007] In order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly describes the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can obtain other drawings from these drawings without creative efforts. [Figure 1] FIG. 1 is a schematic structural diagram of an embodiment of a display panel in the related art; [Diagram 2] FIG. 1 is a schematic structural diagram of a pixel circuit according to a related art. [Diagram 3] FIG. 3 is a timing diagram of the pixel circuit of FIG. [Figure 4] FIG. 2 is another schematic structural diagram of a pixel circuit in the related art; [Diagram 5] 1 is a schematic cross-sectional structural diagram of an embodiment of a display panel of the present application. [Figure 6] 6 is a schematic diagram showing the relative positions of an active layer and an auxiliary electrode in the initialization transistor of FIG. 5. [Figure 7] 4 is a schematic diagram of electrical connection between a light-emitting element and an auxiliary electrode in one embodiment. FIG. [Figure 8] 13 is a schematic diagram showing electrical connection between a light-emitting element and an auxiliary electrode in another embodiment. FIG. [Figure 9] FIG. 2 is a schematic structural diagram of a pixel circuit in an embodiment of the present application. [Figure 10] FIG. 2 is a schematic structural diagram of a pixel circuit in another embodiment of the present application. [Figure 11] FIG. 13 is a schematic structural diagram of a pixel circuit in yet another embodiment of the present application. [Figure 12]4 is a schematic structural diagram of a first initialization transistor, a second initialization transistor, and an auxiliary electrode in one embodiment. FIG. [Figure 13] 13 is a schematic diagram showing the configuration of a first initialization transistor, a second initialization transistor, and an auxiliary electrode in another embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, the technical solutions of the embodiments of the present application will be clearly and completely described with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments of the present application, all other embodiments that a person skilled in the art can obtain without inventive work are all within the scope of protection of the present application.

[0009] The terms "first", "second", etc. in this application are used for descriptive purposes only and should not be construed to indicate or imply a relative importance or number of technical features indicated. Thus, features defined as "first" and "second" can explicitly or implicitly include at least one of these features. In the description of this application, "plurality" means at least two, e.g., two, three, etc., unless otherwise clearly and specifically defined. Also, the terms "comprise", "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the recited steps or units, but may optionally further include unrecited steps or units, or may optionally further include other steps or units inherent to these processes, methods, products, or apparatus.

[0010] Before describing the technical solution of this application, the structure of the display panel will be described first.

[0011] Referring to FIG. 1, the display panel includes a plurality of pixel units 1, a plurality of scan lines S1 to Sn, a plurality of data lines V data1 ~V datam, a plurality of emission control lines EM1 to EMn, and a voltage generator 2. The scanning lines and the data signal lines are substantially perpendicular to each other. The pixel units 1 are disposed in a limited area where the scanning lines and the data lines intersect, and each pixel unit 1 includes a light emitting element and a pixel circuit for driving the light emitting element to emit light. Each pixel circuit is connected to a first power line V DD , second power line V SS , and the initial voltage signal line V REF and the first power supply line V DD is used to transmit a first voltage signal to the anode of the light emitting element, the first voltage signal being a high level signal, and the second power line V SS is used to transmit a second voltage signal to the cathode of the light-emitting element, and the second voltage signal is usually a low level signal. Here, the initial voltage signal line V REF is used to input a reference voltage to the pixel circuit to initialize the pixel circuit. The initial voltage signal line V REF The number of can be one or two, see below.

[0012] Here, the pixel circuit may be various circuits such as a 7T1C circuit, a 9T1C circuit, a 6T2C circuit, etc. Referring to FIG. 2, the following takes the pixel circuit as a 7T1C circuit as an example to describe the specific operation process of the pixel circuit.

[0013] In the scene of FIG. 2, the pixel circuit includes a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7, and a storage capacitor C (storage capacitor). Each transistor includes a gate electrode, a first electrode, and a second electrode. The first electrode is one of a source electrode or a drain electrode, and the second electrode is the other of a source electrode or a drain electrode. For different transistors, the first electrodes of some transistors are source electrodes and the first electrodes of some transistors are drain electrodes according to the applied voltage. Here, the seventh transistor M7 is a driving transistor and is used to control the current flowing to the light-emitting element D, and the other transistors are all switching transistors. The first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, the fifth transistor M5, the sixth transistor M6, and the seventh transistor M7 may be one of low-temperature polysilicon thin film transistors, oxide semiconductor thin film transistors, and amorphous silicon thin film transistors, and may be P-type thin film transistors or N-type thin film transistors. When a P-type thin film transistor is used, a low level signal is input to the gate electrode of the transistor that needs to be turned on, and when an N-type thin film transistor is used, a high level signal is input to the gate electrode of the transistor that needs to be turned on.

[0014] Specifically, the gate electrode of the first transistor M1 is connected to the scanning signal line Sn of the pixel row in which the light-emitting element D is located, the gate electrode of the second transistor M2 is connected to the scanning signal line Sn, the first electrode of the first transistor M1 is connected to the second electrode of the seventh transistor M7, and the second electrode of the first transistor M1 is connected to the gate electrode of the seventh transistor M7.

[0015] The first electrode of the second transistor M2 is connected to the data signal line V data , and a second electrode of the second transistor M2 is connected to a first electrode of the seventh transistor M7.

[0016] A gate electrode of the third transistor M3 and a gate electrode of the sixth transistor M6 are both connected to the light emission control line EM, a first electrode of the third transistor M3 is connected to a first electrode of the seventh transistor M7, and a second electrode of the third transistor M3 is connected to the first power line V DD is connected to.

[0017] The gate electrode of the fourth transistor M4 is connected to the scanning signal line Sn-1 of the previous pixel row, the first electrode of the fourth transistor M4 is connected to the anode of the light-emitting element D, and the second electrode of the fourth transistor M4 is connected to the initial voltage signal line V REF is connected to.

[0018] The gate electrode of the fifth transistor M5 is connected to the scanning signal line Sn-1 of the previous pixel row, the first electrode of the fifth transistor M5 is connected to the gate electrode of the seventh transistor M7, and the second electrode of the fifth transistor M5 is connected to the initial voltage signal line V REF is connected to.

[0019] The gate electrode of the sixth transistor M6 is connected to the light emission control line EM, the first electrode of the sixth transistor M6 is connected to the second electrode of the seventh transistor M7, the second electrode of the sixth transistor M6 is connected to the anode of the light emitting element D, and the first electrode of the storage capacitor C is connected to the first power line V DD The cathode of the light-emitting element D is connected to the second power line V SS and the second power line V SS is used to provide a second voltage signal to the cathode of the light-emitting element D, where the second voltage signal is typically a negative voltage.

[0020] In conjunction with FIG. 3, the sequence of operation of the pixel circuit of FIG. 2 includes an initialization phase t1, a writing phase t2, and an emission phase t3.

[0021] Here, in the initialization stage t1, the scanning signal line Sn-1 in the row preceding the light emitting element D supplies a low voltage signal, and the scanning signal line Sn in the row in which the light emitting element is located and the emission control line EM supply a high voltage signal, in which the fourth transistor M4 and the fifth transistor M5 are turned on, a reference voltage is applied to the anode of the light emitting element D and the gate electrode of the seventh transistor M7, the reference voltage is supplied to the anode of the light emitting element D, and the anode of the light emitting element D is reset, completing its initialization.

[0022] In the writing stage t2, the scanning signal line Sn-1 and the emission control line EM in the row above the light-emitting element D provide a high voltage signal, and the scanning signal line Sn in the row in which the light-emitting element D is located provides a low voltage signal. In this case, as shown by the solid black arrows in FIG. 2, the second transistor M2, the first transistor M1, and the seventh transistor M7 are turned on, and the data signal line V data The compensation voltage after the data voltage of the data signal line V is compensated is applied to the storage capacitor C. data and the absolute value of the threshold voltage of the seventh transistor M7 (the threshold voltage is a negative value), is applied to the storage capacitor C, thereby completing the data voltage writing process.

[0023] In the light emitting stage t3, the scanning signal line Sn in the row where the light emitting element D is located and the scanning signal line Sn-1 in the row preceding the light emitting element D supply high voltage signals, and the light emitting control line EM supplies a low voltage signal. In this case, as shown by the black dotted arrows in FIG. 2, the third transistor M3, the sixth transistor M6, and the seventh transistor M7 are turned on, and the first power line V DD The third transistor M3, the sixth transistor M6, and the seventh transistor M7 supply a driving voltage to the anode of the light-emitting element D, so that the light-emitting element D emits light normally.

[0024] Referring to FIG. 4, the difference with FIG. 2 is that, on the one hand, the eighth transistor M8 and the ninth transistor M9 are added to the pixel circuit, in which the first transistor M1 and the eighth transistor M8 are used as double-gate transistors, and the fifth transistor M5 and the ninth transistor M9 are used as double-gate transistors; on the other hand, the second electrode of the fifth transistor M5 is connected to the first initial voltage signal line V REF1 , and the second electrode of the fourth transistor M4 is connected to the second initial voltage signal line V REF2 In this case, in the initialization stage, the reference voltage transferred to the anode of the light emitting element D and the reference voltage transferred to the gate of the seventh transistor M7 may be the same or different.

[0025] Here, the fifth transistor M5 and the fourth transistor M4 in Figures 2 and 4 can both be referred to as initialization transistors, and in the initialization stage, the fifth transistor M5 and the fourth transistor M4 are made conductive, thereby writing a reference voltage to the pixel circuit and initializing the pixel circuit.

[0026] From the above, the reference voltage input to the pixel circuit in the initialization stage and the second power line V ss It can be seen that the voltages input to the light-emitting element D are all negative voltages. That is, the voltages written to the pixel circuit in the initialization stage and the voltages applied to the cathode of the light-emitting element D are both negative voltages.

[0027] At the same time, in the related art, the same type of initialization voltage signal line is wired in a grid pattern to initialize each pixel circuit. For example, in the pixel circuit of FIG. 2, the initialization voltage signal line V REF are wired in a grid pattern, so that the fifth transistor M5 and the fourth transistor M4 in each pixel circuit are connected to the initial voltage signal line V REF In the pixel circuit of FIG. 4, the first initial voltage signal line V REF1 are wired in a grid pattern. REF2 are also arranged in a lattice pattern, so that the fifth transistor M5 in each pixel circuit is connected to the first initial voltage signal line V REF1, and the fourth transistor M4 in each pixel circuit is electrically connected to the second initial voltage signal line V REF2 It can be ensured that the electrical connection is

[0028] The technical solution of this application is described as follows.

[0029] 5 and 6, in one embodiment of the present application, a display panel 100 includes a substrate 110, a pixel circuit layer 120, a light emitting element 130, and an auxiliary electrode 140. In the embodiment of the present application, as shown in FIG.

[0030] The substrate 110 plays a supporting role in the display panel 100. The substrate 110 is flexible, and therefore stretchable, foldable, bendable, or rollable. This allows the display panel 100 to be stretchable, foldable, bendable, or rollable. The substrate 110 may be a single-layer structure or a laminated structure. In one application scenario, the substrate 110 may include at least one organic layer and at least one inorganic layer that are laminated. The material of the organic layer may be a flexible material such as polyimide, and the material of the inorganic layer may be a material with better water vapor barrier properties such as silicon nitride. The substrate 110 may also be transparent, semi-transparent, or opaque. At the same time, the display panel 100 may include a buffer layer 150 disposed on the substrate 110, and the buffer layer 150 may cover the entire upper surface of the substrate 110. Of course, the substrate 110 may be a rigid substrate, for example, the material may be glass. The specific structure of the substrate 110 is not limited in this application.

[0031] The pixel circuit layer 120 is disposed on one side of the substrate 110 and includes a pixel circuit. The light-emitting element 130 is disposed on a side of the pixel circuit layer 120 away from the substrate 110 and is electrically connected to the pixel circuit, so that the light-emitting element 130 is driven by the pixel circuit to emit light. Here, the pixel circuit includes an initialization transistor 112. The initialization transistor 112 includes an active layer 1121 and a gate electrode 1122. The active layer 1121 includes a channel region 11211, and a first electrode region 11212 and a second electrode region 11213 located on both sides of the channel region 11211. Here, the orthogonal projection of the gate electrode 1122 on the active layer 1121 overlaps with the channel region 11211. One of the first electrode region 11212 and the second electrode region 11213 is a source region, and the other is a drain region. The first electrode region 11212 corresponds to a first electrode of the initialization transistor 112, and the second electrode region 11213 corresponds to a second electrode of the initialization transistor 112. During the initialization stage, the initialization transistor 112 is turned on and a reference voltage is transmitted to the pixel circuit, thereby initializing the pixel circuit.

[0032] Here, there are a plurality of light emitting elements 130 and a plurality of pixel circuits, the light emitting elements 130 and the pixel circuits are arranged in one-to-one correspondence, and the light emitting elements 130 are driven by the corresponding pixel circuits to emit light. Here, the light emitting element 130 includes a first electrode 131, a light emitting material layer 132, and a second electrode 133, which are stacked. One of the first electrode 131 and the second electrode 133 is an anode, and the other is a cathode. In this embodiment, the first electrode 131 is an anode, and the second electrode 133 is a cathode.

[0033] The auxiliary electrode 140 is disposed on the side of the pixel circuit layer 120 away from the substrate 110, and is electrically connected to the second electrode 133. Specifically, in the related art, when the second electrodes 133 of all the light-emitting elements 130 are continuous structures, that is, when the second electrodes 133 are the entire surface film layer (for convenience of explanation, the entire surface film layer is defined as the second electrode layer), the presence of resistance causes the potentials at different positions of the second electrode layer to be different, which causes the potentials of the second electrodes 133 of the different light-emitting elements 130 to be different, and ultimately affects the light-emitting efficiency of the light-emitting elements 130. Therefore, in order to avoid this defect, during the manufacturing process, after forming the second electrode layer, the second electrode layer is patterned to obtain a plurality of second electrodes 133 insulated from each other. In addition, an auxiliary electrode 140 is provided corresponding to each second electrode 133 and electrically connected thereto, so that a voltage (negative voltage) can be applied to the second electrode 133 via the auxiliary electrode 140, thereby reducing the voltage drop and ensuring the light-emitting efficiency of the light-emitting elements 130.

[0034] In one application scenario, the display panel 100 is connected to the second power line V SS The auxiliary electrode 140 is connected to the second power line V SS , so that the second electrode 133 of the light emitting element 130 is electrically connected to the second power line V SS That is, the second power supply line V SS After the second voltage signal is transmitted to the auxiliary electrode 140 by the second electrode 133 , the second voltage signal is transmitted to the second electrode 133 of the light emitting element 130 by the auxiliary electrode 140 .

[0035] 5 , when the number of light-emitting elements 130 is multiple, the auxiliary electrode 140 is disposed between adjacent light-emitting elements 130. The auxiliary electrode 140 may be electrically connected to the second electrodes 133 of two adjacent light-emitting elements 130 at the same time, or the auxiliary electrode 140 may be electrically connected to only the second electrode 133 of one light-emitting element 130 in the multiple light-emitting elements 130 and insulated from the second electrode 133 of the other light-emitting element 130.

[0036] 7 and 8, in one application scenario, when the number of light emitting elements 130 is multiple, the number of auxiliary electrodes 140 is also multiple, in which case the multiple auxiliary electrodes 140 are spaced apart. Specifically, the multiple auxiliary electrodes 140 spaced apart may be installed insulated from each other, in which case one auxiliary electrode 140 may be electrically connected to the second electrodes 133 of the multiple light emitting elements 130, so that a voltage may be applied to the second electrodes 133 of the multiple light emitting elements 130 simultaneously via the same auxiliary electrode 140.

[0037] In the application scenarios of FIG. 7 and FIG. 8, the light emitting elements 130 with the second electrodes 133 connected to the same auxiliary electrode 140 can be set to emit the same color. This can ensure that the voltages applied to the second electrodes 133 of the light emitting elements 130 of the same color are the same for the light emitting elements 130 of the same color, and can ensure that the light emitting elements 130 of the same color emit light with the same brightness. Furthermore, the second electrodes 133 of the light emitting elements 130 of different colors can be connected to different auxiliary electrodes 140. This can allow the voltages applied to the second electrodes 133 of the light emitting elements 130 of different colors to be different for the light emitting elements 130 of different colors, that is, can achieve the purpose of setting different VSS voltages and reducing power consumption.

[0038] Here, the auxiliary electrode 140 may have a lattice structure so that it can be electrically connected to the second electrodes 133 of a plurality of light emitting elements 130 at the same time.

[0039] Of course, in other embodiments, the second electrodes 133 of different light-emitting elements 130 may be electrically connected to different auxiliary electrodes 140. For example, a plurality of light-emitting elements 130 correspond one-to-one to a plurality of auxiliary electrodes 140, and the second electrodes 133 of the light-emitting elements 130 are electrically connected to the auxiliary electrodes 140 corresponding to the light-emitting elements 130.

[0040] In other embodiments, the auxiliary electrode 140 may be strip-shaped, block-shaped, or of other structure.

[0041] 7 and 8, in one application scenario, multiple light-emitting elements 130 are arranged in multiple rows and columns. In one application scenario, as shown in FIG. 7, the light-emitting elements 130 in the same column emit the same color, and the light-emitting elements 130 in two adjacent columns emit different colors. For example, the light-emitting elements 130 in the same column all emit red, all emit green, or all emit blue. Of course, in other embodiments, the light-emitting elements 130 in the same column may also emit different colors, but are not limited thereto.

[0042] 7 and 8, the second electrodes 133 of the light emitting devices 130 in the same column are electrically connected to the same auxiliary electrode 140, so that the voltages applied to the second electrodes 133 of the light emitting devices 130 are the same.

[0043] Continuing to refer to FIG. 7, in this case, the second electrodes 133 of the light-emitting elements 130 in different columns are electrically connected to different auxiliary electrodes 140, so that the voltages applied to the second electrodes 133 of the light-emitting elements 130 in different columns are different, i.e., differentiated V SS You can set the voltage and save power consumption.

[0044] 8, what is different from the embodiment of FIG. 7 is that in this case, the second electrodes 133 of the light-emitting elements 130 in some of the adjacent columns are electrically connected to the same auxiliary electrode 140, and the second electrodes of the light-emitting elements 130 in other adjacent columns are electrically connected to different auxiliary electrodes 140. That is, in this case, the voltages applied to the second electrodes 133 of the light-emitting elements 130 in some different columns are the same, and the voltages applied to the second electrodes 133 of the light-emitting elements 130 in some different columns are different, which can meet various practical needs.

[0045] In summary, the present application does not impose any particular restrictions on the placement of the auxiliary electrodes 140.

[0046] 5 and 6, in this embodiment, the auxiliary electrode 140 is electrically connected to the second electrode region 11213 of the active layer 1121 of the initialization transistor 112 through the via hole 10. Thus, in the initialization stage, the initialization transistor 112 transmits the voltage of the auxiliary electrode 140 to the pixel circuit to initialize the pixel circuit.

[0047] Specifically, it can be seen from the above analysis that the voltage written to the pixel circuit and the voltage applied to the second electrode 133 of the light emitting element 130 in the initialization stage are negative voltages. Taking this into consideration, the present application provides the auxiliary electrode 140 to be directly provided so as to be electrically connected to the second electrode region 11213 of the active layer 1121 of the initialization transistor 112 through the via hole 10, and the pixel circuit can be initialized directly using the voltage of the second electrode 133. That is, the second electrode 133 of the light emitting element 130 is electrically connected to the second electrode of the initialization transistor 112, and thus there is no need to provide an initial voltage signal line electrically connected to the second electrode of the initialization transistor 112. The light transmittance of the display panel 100 can be improved, while space can be saved, so that more light emitting elements 130 can be arranged in the same space, and the PPI (Pixels Per Inch, pixel density unit) of the display panel 100 can be improved. In addition, by applying a voltage to the auxiliary electrode 140, the auxiliary electrode 140 has good conductive properties, the voltage drop can be reduced, and the uniformity of the reset of the pixel circuit can be ensured. In other words, the design of the present application can improve the performance of the display panel 100.

[0048] 5 and 9, FIG. 9 is a circuit structure diagram of the pixel circuit of FIG. 5 in the first application scenario. In this case, the pixel circuit further includes a driving transistor 113 (having the same function as the seventh transistor in FIG. 2 and FIG. 4). The driving transistor 113 is used to generate a driving current for making the light-emitting element 130 emit light. In this case, the initialization transistor 112 includes a first initialization transistor 116 (in the figure, the active layer, gate electrode, channel region of the active layer, first electrode region, and second electrode region of the first initialization transistor 116 are numbered 1161, 1162, 11611, 11612, and 11613, respectively). The via hole 10 includes a first via hole 40. In this case, the second electrode region 11613 of the active layer 1161 in the first initialization transistor 116 is electrically connected to the auxiliary electrode 140 through the first via hole 40. In this case, the first electrode region 11612 of the active layer 1161 of the first initialization transistor 116 is electrically connected to the gate electrode of the driving transistor 113, thereby causing the first initialization transistor 116 to transmit the voltage applied to the auxiliary electrode 140 to the gate electrode of the driving transistor 113.

[0049] Specifically, in this application scenario, the function of the first initialization transistor 116 is the same as that of the fifth transistor M5 in FIG. 2 and FIG. 4, and its function is to transmit a reference voltage to the gate electrode of the driving transistor 113 after being turned on. Specifically, the gate electrode of the first initialization transistor 116 is connected to the scanning signal line Sn-1 of the previous pixel row, the first electrode of the first initialization transistor 116 is connected to the gate electrode of the driving transistor 113, and the second electrode of the first initialization transistor 116 is connected to the second electrode of the driving transistor 113. Thus, in the first initialization stage, the first initialization transistor 116 is turned on and the second power line V SS The second voltage signal is transmitted to the first electrode 131 of the light emitting element 130. That is, the voltage of the second electrode 133 of the light emitting element 130 is transmitted to the gate electrode of the driving transistor 113 to initialize the gate voltage of the driving transistor 113.

[0050] Wherein, in the first application scenario, the first initialization transistor 116 may be a single-gate thin film transistor or a double-gate thin film transistor. Wherein, in FIG. 9, the first initialization transistor 116 is a double-gate thin film transistor.

[0051] 9, in this case, in the first application scenario, the pixel circuit also includes a second initialization transistor 118. A gate electrode of the second initialization transistor 118 is connected to the scanning signal line Sn-1 of the previous pixel row, a first electrode of the second initialization transistor 118 is electrically connected to the first electrode 131 of the light emitting element 130, and a second electrode of the second initialization transistor 118 is connected to the second initial voltage signal line V REF2 In another embodiment, the gate electrode of the second initialization transistor 118 may be connected to the scanning signal line of another row.

[0052] In this case, in the first initialization stage, the first initialization transistor 112 is turned on, and the voltage of the second electrode 133 of the light emitting element 130 is transmitted to the gate electrode of the driving transistor 113, and in the second initialization stage, the second initialization transistor 118 is turned on, and the second initialization voltage signal line V REF2 is transmitted to the first electrode 131 of the light emitting element 130. Here, the first initialization stage and the second initialization stage may be the same stage, or may be two different stages within the initialization stage.

[0053] 9, the pixel circuit includes a first emission control transistor M3 and a second emission control transistor M6. The gate electrodes of the first emission control transistor M3 and the second emission control transistor M6 are both electrically connected to the emission control line EM, and the first electrode of the first emission control transistor M3 is connected to the first power line V DD a first electrode of the first light-emitting control transistor M3 electrically connected to a first electrode of the driving transistor 113, a first electrode of the second light-emitting control transistor M6 electrically connected to a second electrode of the driving transistor 113, and a second electrode of the second light-emitting control transistor M6 electrically connected to a first electrode 131 of the light-emitting element 130.

[0054] As shown in Figure 9, in the first application scenario, except for the above-mentioned parts, it should be noted that the other components and connections in the pixel circuit are the same as those corresponding to Figures 2 and 4. In addition, in the drawings of this application, the active layer, gate electrode, channel region, first electrode region, and second electrode region of the second initialization transistor 118 are numbered as 1181, 1182, 1182, 11811, 11812, and 11813, respectively.

[0055] 10, the difference between the application scenario of FIG. 9 and the application scenario of the present embodiment is that in the first initialization stage, the first initialization transistor 116 is turned on, and the first initialization voltage signal line V REF1 The voltage is transmitted to the gate electrode of the driving transistor 113, and in the second initialization stage, the second initialization transistor 118 is turned on, and the second power line V SS The second voltage signal is transmitted to the first electrode 131 of the light emitting element 130, i.e., the voltage of the second electrode 133 of the light emitting element 130 is transmitted to the first electrode 131 of the light emitting element 130. Specifically, in this case, the second electrode region of the active layer of the second initialization transistor 118 is electrically connected to the auxiliary electrode 140 through a second via hole (not shown in FIG. 10), and the first electrode region of the active layer of the second initialization transistor 118 is connected to the first electrode 131 of the light emitting element 130. That is, in this case, the first electrode of the second initialization transistor 118 is electrically connected to the first electrode 131 of the light emitting element 130, and the second electrode of the second initialization transistor 118 is electrically connected to the second electrode of the light emitting element 130, so that in the second initialization stage, the second initialization transistor 118 is turned on and the second power line V SS The second voltage signal is transmitted to the first electrode 131 of the light-emitting element 130, i.e., the voltage of the second electrode 133 of the light-emitting element 130 is transmitted to the first electrode 131, thereby resetting the first electrode 131 of the light-emitting element 130.

[0056] The gate electrode of the first initialization transistor 116 is connected to the scanning signal line Sn-1 of the previous pixel row, the first electrode of the first initialization transistor 116 is connected to the gate electrode of the driving transistor 113 and the second electrode of the storage capacitor C, and the second electrode of the first initialization transistor 116 is connected to the first initial voltage signal line V REF1 , so that in the first initialization stage, the first initialization transistor 116 is turned on and the first initialization voltage signal line V REF1 This voltage is transmitted to the gate electrode of the driving transistor 113 .

[0057] In the second application scenario, the first initialization transistor 116 may be a single-gate thin film transistor or a double-gate thin film transistor, where as in FIG. 10, the first initialization transistor 116 is a double-gate thin film transistor.

[0058] As shown in FIG. 10, in the second application scenario, it should be noted that, except for the parts mentioned above, the other components and connections in the pixel circuit are the same as the corresponding components and connections in FIG. 2 and FIG. 4.

[0059] 11 and 12, in the third application scenario of this embodiment, in the first initialization stage, the first initialization transistor 116 is turned on, and the second power line V SS The second voltage signal is transmitted to the first electrode 131 of the light emitting element 130, i.e., the voltage of the second electrode 133 of the light emitting element 130 is transmitted to the gate electrode of the driving transistor 113. In the second initialization stage, the second initialization transistor 118 is turned on, and the second power line V SSThe second voltage signal is transmitted to the first electrode 131 of the light emitting element 130, i.e., the voltage of the second electrode 133 of the light emitting element 130 is transmitted to the first electrode 131 of the light emitting element 130. Specifically, in this case, the second electrode region 11613 of the active layer 1161 of the first initialization transistor 116 is electrically connected to the auxiliary electrode 140 through the first via hole 40, the first electrode region 11612 of the active layer 1161 of the first initialization transistor 116 is electrically connected to the gate electrode of the driving transistor 113, and the gate electrode of the first initialization transistor 116 (indicated by reference symbol 1162 in FIG. 12) is connected to the scanning signal line Sn-1 of the previous pixel row. The second electrode region 11813 of the active layer 1181 of the second initialization transistor 118 is electrically connected to the auxiliary electrode 140 through the second via hole 60, the first electrode region 11812 of the active layer 1181 of the second initialization transistor 118 is electrically connected to the first electrode 131 of the light-emitting element 130 (this connection is not shown in FIG. 12), and the gate electrode of the second initialization transistor 118 (indicated by reference numeral 1182 in FIG. 12) is connected to the scanning signal line Sn-1 of the previous pixel row. In other embodiments, the gate electrode of the second initialization transistor 118 may be connected to the scanning signal line of another row.

[0060] In this case, in the first initialization stage, the first initialization transistor 112 is turned on and the voltage of the second electrode 133 of the light emitting element 130 is transmitted to the gate electrode of the driving transistor 113, and in the second initialization stage, the second initialization transistor 118 is turned on and the voltage of the second electrode 133 of the light emitting element 130 is transmitted to the first electrode 131 of the light emitting element 130. That is, in this case, the voltage of the second electrode 133 of the light emitting element 130, i.e., the voltage of the second power line V SS The second voltage signal is used to reset the driving transistor 113 and the first electrode 133 of the light emitting element 130 simultaneously.

[0061] At the same time, in the third application scenario, the first initialization transistor 116 can be a single-gate thin film transistor or a double-gate thin film transistor. In FIG. 11, the first initialization transistor 116 is a double-gate thin film transistor.

[0062] As shown in FIG. 11, in the third application scenario, it should be noted that, except for the parts mentioned above, the other components and connections in the pixel circuit are the same as the corresponding components and connections in FIG. 2 and FIG. 4.

[0063] In the third application scenario, the active layer 1121 of the first initialization transistor 116 is electrically connected to the auxiliary electrode 140 through the first via hole 40, and the active layer 1181 of the second initialization transistor 118 is electrically connected to the auxiliary electrode 140 through the second via hole 60. In this case, the first initialization voltage signal line V REF1 and the second initial voltage signal line V REF2 Since there is no need to install a hologram display panel 102, compared with the above two application scenarios, it can further save space and improve the light transmittance and PPI of the display panel 100.

[0064] From the above, in the present application, it is possible to set only that the second electrode region 11613 of the active layer 1161 of the first initialization transistor 116 is electrically connected to the auxiliary electrode 140 through the first via hole 40, or to set only that the second electrode region 11813 of the active layer 1181 of the second initialization transistor 118 is electrically connected to the auxiliary electrode 140 through the second via hole 60, and it is also possible to simultaneously set that the second electrode region 11613 of the active layer 1161 of the first initialization transistor 116 is electrically connected to the auxiliary electrode 140 through the first via hole 40 and that the second electrode region 11813 of the active layer 1181 of the second initialization transistor 118 is electrically connected to the auxiliary electrode 140 through the second via hole 60. That is, SS The gate electrode of the driving transistor 113 can be reset using only the second voltage signal of the second power line V, i.e., using only the voltage of the second electrode 133 of the light emitting element 130, or SS The first electrode 131 of the light-emitting element 130 can be reset using only the second voltage signal, i.e., using only the voltage of the second electrode 133 of the light-emitting element 130, or the second power line V SSThe gate electrode of the driving transistor 113 can be reset by simultaneously using the second voltage signal, i.e., the voltage of the second electrode 133 of the light-emitting element 130, and the voltage of the second electrode 133 of the light-emitting element 130 is used to reset the first electrode 131 of the light-emitting element 130.

[0065] Continuing to refer to FIG. 5, when the number of light emitting elements 130 is plural, the number of via holes 10 is also plural, and the light emitting elements 130 and the via holes 10 correspond one-to-one. Here, the one-to-one correspondence between the light emitting elements 130 and the via holes 10 means that, for any light emitting element 130, the second electrode region 11213 of the active layer 1121 of the initialization transistor 112 of the pixel circuit electrically connected to the light emitting element 130 is electrically connected to the auxiliary electrode 140 via the via hole 10 corresponding to the light emitting element 130. Therefore, for any light emitting element 130, the pixel circuit electrically connected to the light emitting element 130 can be initialized using the voltage applied to the auxiliary electrode 140 and the second electrode 133 of the light emitting element 130.

[0066] 5, the via hole 10 is located between adjacent light emitting elements 130, i.e., between the effective light emitting areas of adjacent light emitting elements 130. In one embodiment, the effective light emitting area of ​​the light emitting element 130 is an area corresponding to a pixel opening. This setting can reduce the difficulty of the preparation process, improve the preparation efficiency, and ensure the product yield.

[0067] At the same time, the orthogonal projection of the auxiliary electrode 140 on the substrate 110 covers the orthogonal projection of the via hole 10 on the substrate 110. This ensures the electrical connection between the auxiliary electrode 140 and the via hole 10 and prevents a short circuit between the auxiliary electrode 140 and the via hole 10.

[0068] 12, the via hole 10 includes a plurality of hole segments 11 that are electrically connected. Specifically, in order to reduce the difficulty of the preparation process, the via hole 10 is formed in segments during preparation, i.e., the via hole 10 is formed by multiple patterning processes. Of course, in other embodiments, if the process conditions permit, the via hole 10 can be formed in a single mold. That is, the via hole 10 can be formed in a single patterning process.

[0069] 12, it is considered that when the hole segments 11 are formed by a patterning process, the strength of the display panel 100 at the hole segments 11 is reduced, so that the orthogonal projections of at least some of the hole segments 11 on the substrate 110 are spaced apart from each other, i.e., at least some of the hole segments 11 are offset from each other, to avoid the hole segments 11 all gathering in a straight line.

[0070] Here, the orthogonal projections of all hole segments 11 on the substrate 110 may be spaced apart from one another, or the orthogonal projections of only some of the hole segments 11 on the substrate 110 may be spaced apart from one another, and the orthogonal projections of other parts of the hole segments 11 on the substrate 110 may at least partially overlap.

[0071] 12, in one embodiment, the display panel 100 further includes a first connection electrode 134 and a second connection electrode 135. The auxiliary electrode 140 is electrically connected to the second electrode region 1123 of the active layer 1121 of the initialization transistor 112 via the first connection electrode 134 and the second connection electrode 135. That is, the auxiliary electrode 140 is not directly electrically connected to the second electrode region 11213 of the active layer 1121 of the initialization transistor 112, but is electrically connected to the second electrode region 11213 of the active layer 1121 of the initialization transistor 112 via the first connection electrode 134 and the second connection electrode 135. This setting reduces the difficulty of the preparation process and reduces the transmission resistance.

[0072] 12, the plurality of hole segments 11 includes a first target hole segment 101, a second target hole segment 102, and a third target hole segment 103. The auxiliary electrode 140 fills the first target hole segment 101, an upper surface of the first connection electrode 134 is exposed from the first target hole segment 101, a lower surface of the auxiliary electrode 140 contacts an upper surface of the first connection electrode 134, the first connection electrode 134 fills the second target hole segment 102, a lower surface of the first connection electrode 134 contacts an upper surface of the second connection electrode 135, the second connection electrode 135 fills the third target hole segment 103, an upper surface of the second electrode region 11213 of the active layer 1121 of the initialization transistor 112 is exposed from the third target hole segment 103, and a lower surface of the second connection electrode 135 contacts an upper surface of the second electrode region 11213 of the active layer 1121 of the initialization transistor 112.

[0073] Specifically, in the preparation process, first, the third target hole segment 103 is formed, then the second connection electrode 135 is formed, and the third target hole segment 103 is filled with the second connection electrode 135, then the second target hole segment 102 is formed, the first connection electrode 134 is formed, and the second target hole segment 102 is filled with the first connection electrode 134, then the first target hole segment 101 is formed, and finally the auxiliary electrode 140 is formed, and the first target hole segment 101 is filled with the auxiliary electrode 140.

[0074] Here, the materials of the first connection electrode 134 and the second connection electrode 135 may be the same or different, and are not limited here.

[0075] Here, as shown in FIG. 12, when the second electrode region 11613 of the active layer 1161 of the first initialization transistor 116 is electrically connected to the auxiliary electrode 140 through the first via hole 40, and the second electrode region 11813 of the active layer 1181 of the second initialization transistor 118 is electrically connected to the auxiliary electrode 140 through the second via hole 60, the first via hole 40 and the second via hole 60 are installed with a gap between them to ensure the strength of the display panel 100.

[0076] 13, the first via hole 40 includes a plurality of first hole segments 41 electrically connected in sequence, and the second via hole 60 includes a plurality of second hole segments 61 electrically connected in sequence. In this case, in order to improve preparation efficiency and reduce the patterning process, at least a part of the first hole segments 41 are multiplexed as at least a part of the second hole segments 61. That is, in this case, a specific hole segment can serve as both the first hole segment 41 and the second hole segment 61. This can reduce the number of openings in the preparation process, and not only can the strength of the display panel 100 be ensured, but also the preparation efficiency can be improved.

[0077] Continuing to refer to FIG. 5, the display panel 100 further includes a pixel defining layer 160 and an encapsulating layer 170 .

[0078] The pixel definition layer 160 is provided on a side of the pixel circuit layer 120 remote from the substrate 110. A pixel opening is provided in the pixel definition layer 160. At least a part of the light emitting element 130 is formed in the pixel opening, and the first electrode 131 of the light emitting element 130 is exposed from the pixel opening. Here, the auxiliary electrode 140 is disposed on a side of the pixel definition layer 160 remote from the substrate 110, and at the same time, the second electrode 133 extends from the pixel opening to a sidewall of the auxiliary electrode 140.

[0079] Specifically, the pixel defining layer 160 may be formed of an organic material such as polyimide (PI), polyamide, benzocyclobutene (BCB), acrylic resin, phenolic resin, etc., or an inorganic material such as SiNx. Or, the pixel defining layer 160 may include organic and inorganic materials at the same time. At the same time, the first electrode 131 is exposed in the pixel opening, and the light emitting material layer 132 may be entirely formed in the pixel opening or partially formed in the pixel opening. For example, in one application scenario, a part of the light emitting material layer 132 is formed in the pixel opening, and another part of the light emitting material layer 132 extends to a side of the pixel defining layer 160 away from the substrate 110, and a part of the second electrode 133 is formed in the pixel opening, and another part of the second electrode 133 extends from the pixel opening to a side of the pixel defining layer 160 away from the substrate 110 and extends to a side of the auxiliary electrode 140, thereby realizing an electrical connection between the second electrode 133 and the auxiliary electrode 140. In one embodiment, the via hole 10 passes through the pixel defining layer 160 .

[0080] The encapsulation layer 170 is disposed on the side of the light-emitting element 130 remote from the substrate 110, i.e., on the side of the pixel defining layer 160 remote from the substrate 110. The orthogonal projection of the encapsulation layer 170 on the substrate 110 covers the orthogonal projection of the light-emitting element 130 on the substrate 110, while the encapsulation layer 170 extends to a portion of the surface of the auxiliary electrode 140.

[0081] Specifically, the encapsulation layer 170 is used to encapsulate the light emitting element 130. The encapsulation layer 170 can prevent water vapor from entering structures such as the light emitting element 130 and the auxiliary electrode 140 from the outside, and can play a protective role. Here, the encapsulation layer 170 may be a thin-film encapsulation layer, and includes a first inorganic encapsulation layer, a first organic encapsulation layer, and a second inorganic encapsulation layer that are arranged in this order in a direction away from the substrate 110. Here, the encapsulation layer 170 can include any number of stacked organic encapsulation layers and inorganic encapsulation layers as necessary, and is not particularly limited in the present application.

[0082] Continuing to refer to FIG. 5, in order to reduce the transmission resistance and ensure electrical connection between the auxiliary electrode 140 and the second electrode 133 to prevent short circuits, the thickness of the auxiliary electrode 140 is thicker than that of the second electrode 133.

[0083] Continuing to refer to FIG. 5, the auxiliary electrode 140 includes a conductive layer 141 and a protective layer 142. The conductive layer 141 and the protective layer 142 are stacked in a direction away from the substrate 110, and at the same time, the second electrode 133 is extended to the sidewall of the conductive layer 141. The conductive layer 141 plays a role of signal conduction and is used to realize the electrical connection between the auxiliary electrode 140 and the second electrode 133, and at the same time, the protective layer 142 is provided on the side of the conductive layer 141 away from the substrate 110 and is used to protect the conductive layer 141. Here, the material of the conductive layer 141 may include at least one of aluminum, copper, and gold. In one application scenario, the material of the conductive layer 141 may be aluminum. The material of the protective layer 142 may include titanium. In summary, the materials of the conductive layer 141 and the protective layer 142 are not limited in this application.

[0084] To further enhance the protective effect of the protective layer 142, referring to Fig. 5, the orthogonal projection of the protective layer 142 on the substrate 110 covers the orthogonal projection of the conductive layer 141 on the substrate 110, i.e., the protective layer 142 covers the entire surface of the conductive layer 141. In one application scenario, as shown in Fig. 5, the protective layer 142 protrudes from the conductive layer 141 along a direction parallel to the substrate 110. That is, the orthogonal projection of the protective layer 142 on the substrate 110 extends to the outside of the orthogonal projection of the conductive layer 141 on the substrate 110.

[0085] In other embodiments, the protective layer 142 may cover only a portion of the surface of the conductive layer 141, or the protective layer 142 may cover the entire surface of the conductive layer 141 away from the substrate 110 and may not protrude from the conductive layer 141 in a direction parallel to the substrate 110.

[0086] 5, in order to ensure better contact between the second electrode 133 and the conductive layer 141 and to make the second electrode 133 have a better standing effect, the cross section of the conductive layer 141 perpendicular to the substrate 110 is a regular trapezoid. Of course, in other embodiments, the cross section of the conductive layer 141 perpendicular to the substrate 110 may be, but is not limited to, a rectangle, a triangle, or other shape.

[0087] In addition to the above-mentioned film layers, referring to FIG. 5, the pixel circuit layer 120 specifically includes a first insulating layer 181, a second insulating layer 182, an interlayer dielectric layer 183, a passivation layer 184, a first planarization layer 185, and a second planarization layer 186.

[0088] Here, the first insulating layer 181 is used to realize insulation between the active layer and the gate electrode of each transistor, so that the first insulating layer 181 may also be called a gate insulating layer (GI). The second insulating layer 182 is used to realize insulation of the storage capacitor (not shown in FIG. 5). The interlayer dielectric layer 183 may be formed by an inorganic insulating material such as silicon oxide or silicon nitride, or may be formed by an organic insulating material, and is not limited here. The passivation layer 184 may be formed by an inorganic material such as silicon oxide or silicon nitride, or may be formed by an organic material. The first planarization layer 185 is disposed on the passivation layer 184. The first planarization layer 185 includes an organic material such as acrylic, polyimide (PI), or benzocyclobutene (BCB). The first planarization layer 185 has a planarization effect. The second planarization layer 186 is disposed on the first planarization layer 185. On the one hand, the second planarization layer 186 has a planarization effect to ensure the flatness of the display panel 100. On the other hand, the second planarization layer 186 can also increase the length of the via hole. Here, the material of the second planarization layer 186 may be the same as or different from the material of the first planarization layer 185, and can be set according to actual requirements.

[0089] Here, the structures of the first insulating layer 181, the second insulating layer 182, the interlayer dielectric layer 183, the passivation layer 184, the first planarization layer 185, the second planarization layer 186, etc. all belong to the prior art, and will not be described one by one here.

[0090] Furthermore, the present application provides a display device, which includes the display panel 100 in any of the above embodiments, and the specific structure of the display panel 100 can be referred to the above description. The display device may be any device with a restriction function, such as a mobile phone, a computer, a game machine, etc., but is not limited thereto in this specification.

[0091] The above is an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by utilizing the contents of the specification and drawings of the present application, or directly or indirectly applicable to other related technical fields, is similarly included in the patent protection scope of the present application.

Claims

1. A display panel including a substrate, a pixel circuit layer, a light-emitting element, and an auxiliary electrode, the pixel circuit layer is provided on one side of the substrate and includes a pixel circuit, the pixel circuit includes an initialization transistor, an active layer of the initialization transistor includes a channel region, and a first electrode region and a second electrode region located on both sides of the channel region; the light-emitting element is disposed on a side of the pixel circuit layer away from the substrate and is electrically connected to the pixel circuit, the light-emitting element including a first electrode, a light-emitting material layer, and a second electrode, which are stacked together; a second electrode region of the active layer of the initialization transistor through a via hole, the second electrode region being electrically connected to the second electrode, the second electrode region being electrically connected to the second electrode region of the active layer of the initialization transistor through a via hole,

2. the pixel circuit further includes a driving transistor, the driving transistor being used to generate a driving current for driving the light emitting element to emit light, the initialization transistor including a first initialization transistor, the via hole including a first via hole, a second electrode region of an active layer of the first initialization transistor being electrically connected to the auxiliary electrode through the first via hole, and a first electrode region of an active layer of the first initialization transistor being electrically connected to a gate electrode of the driving transistor, whereby a voltage applied to the auxiliary electrode is transmitted by the first initialization transistor to the gate electrode of the driving transistor; 2. The display panel of claim 1, wherein the pixel circuit further includes a first light-emitting control transistor and a second light-emitting control transistor, a gate electrode of the first light-emitting control transistor and a gate electrode of the second light-emitting control transistor are both electrically connected to a light-emitting control line, a first electrode of the first light-emitting control transistor is electrically connected to a first power supply line, a second electrode of the first light-emitting control transistor is electrically connected to a first electrode of the driving transistor, a first electrode of the second light-emitting control transistor is electrically connected to a second electrode of the driving transistor, and a second electrode of the second light-emitting control transistor is electrically connected to a first electrode of the light-emitting element.

3. the initialization transistor further includes a second initialization transistor, an active layer of the second initialization transistor includes a channel region, and a first electrode region and a second electrode region located on both sides of the channel region of the second initialization transistor; wherein the via hole includes a second via hole, a first electrode region of an active layer of the second initialization transistor is electrically connected to a first electrode of the light emitting device, and a second electrode region of an active layer of the second initialization transistor is electrically connected to the auxiliary electrode through the second via hole, so that a voltage applied to the auxiliary electrode is transmitted to the first electrode of the light emitting device by the second initialization transistor; 3. The display panel of claim 2, wherein the first via hole and the second via hole are spaced apart, or the first via hole includes a plurality of first hole segments electrically connected in sequence, and the second via hole includes a plurality of second hole segments electrically connected in sequence, wherein at least a portion of the first hole segments are multiplexed as at least a portion of the second hole segments.

4. 2. The display panel of claim 1, wherein the initialization transistor includes a second initialization transistor, the via hole includes a second via hole, a second electrode region of an active layer of the second initialization transistor is electrically connected to the auxiliary electrode through the second via hole, and a first electrode region of an active layer of the second initialization transistor is electrically connected to the first electrode of the light-emitting element, whereby a voltage applied to the auxiliary electrode by the second initialization transistor is transmitted to the first electrode of the light-emitting element.

5. the via hole includes a plurality of hole segments; the orthogonal projections of at least some of the hole segments on the substrate are spaced apart; the display panel further includes a first connection electrode and a second connection electrode, the auxiliary electrode being electrically connected to a second electrode region of the active layer of the initialization transistor via the first connection electrode and the second connection electrode; 2. The display panel of claim 1, wherein the hole segments include a first target hole segment, a second target hole segment, and a third target hole segment, the first target hole segment being filled by the auxiliary electrode, an upper surface of the first connection electrode being exposed from the first target hole segment, a lower surface of the auxiliary electrode being in contact with the upper surface of the first connection electrode, the second target hole segment being filled by the first connection electrode, a lower surface of the first connection electrode being in contact with the upper surface of the second connection electrode, the third target hole segment being filled by the second connection electrode, an upper surface of a second electrode region of the active layer of the initialization transistor being exposed from the third target hole segment, and a lower surface of the second connection electrode being in contact with the upper surface of the second electrode region of the active layer of the initialization transistor.

6. the display panel includes a pixel definition layer and an encapsulation layer; the pixel definition layer is disposed on a side of the pixel circuit layer remote from the substrate, a pixel opening is provided in the pixel definition layer, at least a portion of the light emitting element is formed in the pixel opening, a first electrode of the light emitting element is exposed from the pixel opening, the auxiliary electrode is disposed on a side of the pixel definition layer remote from the substrate, and the second electrode extends from the pixel opening to a sidewall of the auxiliary electrode; The via hole is disposed through the pixel definition layer, 2. The display panel of claim 1, wherein the sealing layer is provided on a side of the light-emitting element away from the substrate, a positive projection of the sealing layer on the substrate covers a positive projection of the light-emitting element on the substrate, and the sealing layer extends to a portion of a surface of the auxiliary electrode.

7. the thickness of the auxiliary electrode is greater than the thickness of the second electrode; the auxiliary electrode includes a conductive layer and a protective layer; the second electrode extends to a sidewall of the conductive layer; the protective layer is disposed on a side of the conductive layer remote from the substrate; an orthogonal projection of the protective layer on the substrate overlaying an orthogonal projection of the conductive layer on the substrate; the material of the conductive layer includes aluminum; the material of the protective layer includes titanium; The display panel according to claim 1 , wherein a cross section of the conductive layer perpendicular to the substrate is a regular trapezoid.

8. the number of the light-emitting elements is plural, the number of the auxiliary electrodes is plural, and the auxiliary electrodes are arranged at intervals; The light emitting elements in which the second electrodes connected to the same auxiliary electrode are located emit light of the same color, The auxiliary electrode has a lattice structure.

2. The display panel of claim 1, wherein the display panel further includes a second power line, the second power line is used to provide a second voltage signal, the auxiliary electrode is electrically connected to the second power line, and the second electrode of the light-emitting element is electrically connected to the second power line via the auxiliary electrode.

9. The number of the light-emitting elements is plural, and the auxiliary electrode is disposed between adjacent light-emitting elements, The number of the via holes is plural, and the light emitting elements correspond one-to-one to the via holes; the via hole is located between adjacent light emitting elements, The display panel of claim 1 , wherein an orthogonal projection of the auxiliary electrode on the substrate covers an orthogonal projection of the via hole on the substrate.

10. The number of the light-emitting elements is plural, and the light-emitting elements are arranged in a plurality of rows and a plurality of columns; The second electrodes of the light emitting elements in the same column are electrically connected to the same auxiliary electrode; The second electrodes of the light-emitting elements in different columns are electrically connected to different auxiliary electrodes, or the second electrodes of the light-emitting elements in a portion of an adjacent column are electrically connected to the same auxiliary electrode, and the second electrodes of the light-emitting elements in another portion of an adjacent column are electrically connected to different auxiliary electrodes; 2. The display panel of claim 1, wherein the light emitting elements in the same column emit light of the same color, and the light emitting elements in adjacent columns emit light of different colors.

11. A display device comprising the display panel according to any one of claims 1 to 10.

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