Display panel and display device

Abstract

The invention discloses a display panel and a display device. The display panel comprises a substrate; the pixel circuit layer is arranged on one side of the substrate and comprises a pixel circuit, the pixel circuit comprises an initialization transistor, and an active layer of the initialization transistor comprises a channel region and a first pole region and a second pole region which are located on the two sides of the channel region; the light-emitting element is arranged on the side, away from the substrate, of the pixel circuit layer and electrically connected with the pixel circuit, and the light-emitting element comprises a first electrode, a light-emitting material layer and a second electrode which are arranged in a stacked mode; the auxiliary electrode is arranged on the side, away from the substrate, of the pixel circuit layer and electrically connected with the second electrode, and the auxiliary electrode is electrically connected with the second electrode area of the active layer in the initialization transistor through a via hole. Through the arrangement, the performance of the display panel can be improved.

Description

Technical Field

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

[0002] With the development of display technology, people have higher and higher requirements on display panels, and the performance of display panels needs to be further improved. Summary of the invention

[0003] The present application provides a display panel and a display device, which can improve the performance of the display panel.

[0004] According to a first aspect of an embodiment of the present application, a display panel is provided, comprising: a substrate; a pixel circuit layer, arranged on one side of the substrate, comprising a pixel circuit, wherein the pixel circuit comprises an initialization transistor, and an active layer of the initialization transistor comprises a channel region and a first polar region and a second polar region located on both sides of the channel region; a light-emitting element, arranged on a side of the pixel circuit layer away from the substrate, and electrically connected to the pixel circuit, wherein the light-emitting element comprises a first electrode, a light-emitting material layer and a second electrode arranged in a stacked manner; an auxiliary electrode, arranged on a side of the pixel circuit layer away from the substrate, and electrically connected to the second electrode, and the auxiliary electrode is electrically connected to the second polar region of the active layer in the initialization transistor through a via.

[0005] A second aspect of an embodiment of the present application provides a display device, comprising the display panel of any one of the above items.

[0006] The beneficial effect is: the present application improves the performance of the display panel by setting an auxiliary electrode and electrically connecting the auxiliary electrode to the second electrode region of the active layer in the first initialization transistor through the first via hole, that is, directly using the auxiliary electrode to initialize the pixel circuit, for example, optimizing the wiring space and improving the light transmittance. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0008] Figure 1 is a structural schematic diagram of an implementation scheme of a display panel in the related art;

[0009] Figure 2 A schematic diagram of the structure of a pixel circuit in the related art;

[0010] Figure 3 yes Figure 2 Timing diagram of the pixel circuit in the figure;

[0011] Figure 4 is another structural schematic diagram of a pixel circuit in the related art;

[0012] Figure 5 is a schematic cross-sectional structure diagram of an embodiment of a display panel of the present application;

[0013] Figure 6 yes Figure 5 Schematic diagram of the relative positions of the active layer and the auxiliary electrode in the initialization transistor;

[0014] Figure 7 is a schematic diagram of electrical connection between a light emitting element and an auxiliary electrode in one embodiment;

[0015] Figure 8 is a schematic diagram of electrical connection between a light emitting element and an auxiliary electrode in another embodiment;

[0016] Fig. 9 is a schematic structural diagram of a pixel circuit in one embodiment of the present application;

[0017] Fig.10 is a structural schematic diagram of a pixel circuit in another embodiment of the present application;

[0018] Fig.11 is a structural schematic diagram of a pixel circuit in another embodiment of the present application;

[0019] Fig.12 is a schematic diagram of the structure of a first initialization transistor, a second initialization transistor and an auxiliary electrode in one embodiment;

[0020] Fig.13 2 is a schematic diagram of the structure of a first initialization transistor, a second initialization transistor and an auxiliary electrode in another embodiment. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] It should be noted that the terms "first" and "second" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0023] Before introducing the solution of this application, a basic introduction to the structure of the display panel is given:

[0024] See also Figure 1 The display panel includes a plurality of pixel units 1, a plurality of scanning lines S1-Sn, a plurality of data lines V data1 ~V datam , a plurality of light-emitting control lines EM1 to EMn and a voltage generator 2, wherein the scanning line is substantially perpendicular to the data signal line. The pixel unit 1 is arranged in an area defined by the intersection of the scanning line and the data line, 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 respectively connected to a first power line V DD , the second power line V SS and the initial voltage signal line V REF Connect the first power line V DD It is used to transmit a first voltage signal to the anode of the light-emitting element, where the first voltage signal is a high-level signal. The second power line V SS It 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. REF It is used to input a reference voltage to the pixel circuit to initialize the pixel circuit, wherein the initial voltage signal line V REF The number can be one or two, as described below.

[0025] The pixel circuit can be a 7T1C circuit, a 9T1C circuit, a 6T2C circuit, etc. Figure 2 , the following takes the pixel circuit as an example to introduce the specific working process of the pixel circuit:

[0026] exist Figure 2In the scenario, 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. Each transistor includes a gate, a first electrode and a second electrode, the first electrode is one of the source or the drain, and the second electrode is the other, and for different transistors, the first electrode of some transistors is the source, and the first electrode of some transistors is the drain, depending on the magnitude of the applied voltage. Among them, the seventh transistor M7 is a driving transistor, which is used to control the magnitude of the current flowing through the light-emitting element D, and the other transistors are switching transistors. And 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 can be any one of a low-temperature polysilicon thin-film transistor, an oxide semiconductor thin-film transistor, and an amorphous silicon thin-film transistor, and a P-type thin-film transistor or an N-type thin-film transistor can be used. When a P-type thin-film transistor is used, a low-level signal is input to the gate of the transistor to be turned on; when an N-type thin-film transistor is used, a high-level signal is input to the gate of the transistor to be turned on.

[0027] Specifically, the gate of the first transistor M1 is connected to the scanning signal line Sn of the pixel row where the light-emitting element D is located, the gate 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 of the seventh transistor M7.

[0028] A first electrode of the second transistor M2 is connected to the data signal line V data The second electrode of the second transistor M2 is connected to the first electrode of the seventh transistor M7.

[0029] The gate of the third transistor M3 and the gate of the sixth transistor M6 are both connected to the light emitting control line EM, the first electrode of the third transistor M3 is connected to the first electrode of the seventh transistor M7, and the second electrode of the third transistor M3 is connected to the first power line V DD connect.

[0030] The gate 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 connect.

[0031] The gate 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 of the seventh transistor M7, and the second electrode of the fifth transistor M5 is connected to the initial voltage signal line V REF connect.

[0032] The gate of the sixth transistor M6 is connected to the light emitting control line EM, the first electrode of the sixth transistor M6 is connected to the second electrode of the seventh transistor M7, and the second electrode of the sixth transistor M6 is connected to the anode of the light emitting element D; the first electrode of the storage capacitor C is connected to the first power line V DD Connect the cathode of the light emitting element D to the second power line V SS Connect the second power line V SS It is used to provide a second voltage signal to the cathode of the light emitting element D, and the second voltage signal is usually a negative voltage.

[0033] Combination Figure 3 , Figure 2 The working sequence of the pixel circuit includes: an initialization phase t1 , a writing phase t2 , and a light emitting phase t3 .

[0034] In the initialization stage t1, the scanning signal line Sn-1 of the previous row of the light emitting element D provides a low voltage signal, and the scanning signal line Sn and the light emitting control line EM of the row where the light emitting element is located provide a high voltage signal. At this time, the fourth transistor M4 and the fifth transistor M5 are turned on, and the reference voltage is charged into the anode of the light emitting element D and the gate of the seventh transistor M7, providing a reference voltage for the anode of the light emitting element D, resetting the anode of the light emitting element D, and completing the initialization.

[0035] In the writing stage t2, the scanning signal line Sn-1 and the light emitting 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 where the light emitting element D is located provides a low voltage signal. Figure 2 As shown by the black solid arrow, the second transistor M2, the first transistor M1 and the seventh transistor M7 are turned on, and the data signal line V data The data voltage is compensated and the compensation voltage is charged into the storage capacitor C. The compensation voltage is the data signal line V data The difference between the data voltage and the absolute value of the threshold voltage of the seventh transistor M7 (the threshold voltage is a negative value) is charged into the storage capacitor C, completing the data voltage writing process.

[0036] In the light-emitting stage t3, the scanning signal line Sn of the row where the light-emitting element D is located and the scanning signal line Sn-1 of the row above the light-emitting element D provide a high voltage signal, and the light-emitting control line EM provides a low voltage signal. At this time, 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 A driving voltage is provided to the anode of the light emitting element D through the third transistor M3 , the sixth transistor M6 and the seventh transistor M7 , so that the light emitting element D emits light normally.

[0037] See also Figure 4 ,and Figure 2The difference is that, at this time, on the one hand, the pixel circuit adds an eighth transistor M8 and a ninth transistor M9, at this time, the first transistor M1 and the eighth transistor M8 are used as a double-gate transistor, and the fifth transistor M5 and the ninth transistor M9 are used as a double-gate transistor; on the other hand, the second electrode of the fifth transistor M5 is connected to the first initial voltage signal line V REF1 The second electrode of the fourth transistor M4 is connected to the second initial voltage signal line V REF2 Electrically connected, at this time in the initialization stage, the reference voltage transmitted to the anode of the light emitting element D and the reference voltage transmitted to the gate of the seventh transistor M7 can be the same or different.

[0038] in, Figure 2 and Figure 4 The fifth transistor M5 and the fourth transistor M4 in the embodiment may both be referred to as initialization transistors, which are turned on in the initialization phase to write the reference voltage into the pixel circuit, thereby initializing the pixel circuit.

[0039] From the above content, it can be seen that the reference voltage input to the pixel circuit in the initialization stage and the voltage input from the second power line Vss to the light-emitting element D are both negative voltages. In other words, the voltage written into the pixel circuit and the voltage applied to the cathode of the light-emitting element D in the initialization stage are both negative voltages.

[0040] Meanwhile, in the related art, in order to initialize each pixel circuit, the initialization voltage signal lines of the same type are wired in a grid shape, for example, Figure 2 In the pixel circuit, the initial voltage signal line V REF The wiring is in a grid shape, so as to ensure that the fifth transistor M5 and the fourth transistor M4 in each pixel circuit can be connected to the initial voltage signal line V REF Electrical connection, for Figure 4 In the pixel circuit, the first initial voltage signal line V REF1 The second initial voltage signal line V REF2 The wiring is also grid-shaped, so as to ensure that the fifth transistor M5 in each pixel circuit can be connected to the first initial voltage signal line V REF1 The fourth transistor M4 in each pixel circuit can be electrically connected to the second initial voltage signal line V REF2 Electrical connection.

[0041] The following is the scheme of this application:

[0042] See also Figure 5 as well as Figure 6 In one embodiment of the present application, the display panel 100 includes a substrate 110 , a pixel circuit layer 120 , a light emitting element 130 and an auxiliary electrode 140 .

[0043] The substrate 110 plays a supporting role in the display panel 100, wherein the substrate 110 may be flexible, and thus may be stretchable, foldable, bendable or rollable, thereby making the display panel 100 stretchable, foldable, bendable or rollable. The substrate 110 may be a single-layer structure or a laminated structure. In an application scenario, the substrate 110 may include at least one organic layer and at least one inorganic layer stacked in layers. 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 good water vapor barrier performance such as silicon nitride. At the same time, the substrate 110 may be transparent, translucent or opaque. At the same time, the display panel 100 may also include a buffer layer 150 located 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 also be a rigid substrate, for example, its material is glass. In summary, the present application does not limit the specific structure of the substrate 110.

[0044] The pixel circuit layer 120 is arranged on one side of the substrate 110, and includes a pixel circuit. The light-emitting element 130 is arranged on the side of the pixel circuit layer 120 away from the substrate 110, and is electrically connected to the pixel circuit to emit light under the drive of the pixel circuit. The pixel circuit includes an initialization transistor 112, and the initialization transistor 112 includes an active layer 1121 and a gate 1122. The active layer 1121 includes a channel region 11211 and a first polar region 11212 and a second polar region 11213 located on both sides of the channel region 11211, wherein the positive projection of the gate 1122 on the active layer 1121 coincides with the channel region 11211. One of the first polar region 11212 and the second polar region 11213 is a source region, and the other is a drain region, and the first polar region 11212 corresponds to the first polar region of the initialization transistor 112, and the second polar region 11213 corresponds to the second polar region of the initialization transistor 112. In the initialization stage, the initialization transistor 112 is turned on to transmit the reference voltage to the pixel circuit, thereby initializing the pixel circuit.

[0045] There are multiple light-emitting elements 130, multiple pixel circuits, and the light-emitting elements 130 are arranged in one-to-one correspondence with the pixel circuits. The light-emitting elements 130 emit light under the drive of the corresponding pixel circuits. The light-emitting element 130 includes a first electrode 131, a light-emitting material layer 132, and a second electrode 133 that 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.

[0046] The auxiliary electrode 140 is arranged 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 and uninterrupted, that is, the second electrode 133 is a whole-surface film layer (for the convenience of explanation, the whole-surface film layer is defined as the second electrode layer), due to the existence of resistance, the potentials at different positions of the second electrode layer are different, so that the potentials of the second electrodes 133 in different light-emitting elements 130 are different, which ultimately affects the luminous efficiency of the light-emitting element 130. Therefore, in order to avoid this defect, in the preparation process, after the second electrode layer is formed, the second electrode layer is patterned to obtain a plurality of insulated second electrodes 133, and then corresponding to each second electrode 133, an auxiliary electrode 140 electrically connected thereto is prepared, so that a voltage (negative voltage) is applied to the second electrode 133 through the auxiliary electrode 140, which can reduce the voltage drop and ensure the luminous efficiency of the light-emitting element 130.

[0047] In one application scenario, the display panel 100 further includes a second power line V SS , the auxiliary electrode 140 is connected to the second power line V SS The second electrode 133 of the light emitting element 130 is electrically connected to the second power line V via the auxiliary electrode 140. SS That is, the second power line V SS After the second voltage signal is transmitted to the auxiliary electrode 140 , the auxiliary electrode 140 further transmits the second voltage signal to the second electrode 133 of the light emitting element 130 .

[0048] Continue reading Figure 5 When there are multiple light-emitting elements 130, the auxiliary electrode 140 is located between adjacent light-emitting elements 130, and the auxiliary electrode 140 can be electrically connected to the second electrodes 133 of two adjacent light-emitting elements 130 at the same time, or it can be electrically connected to the second electrode 133 of only one of the light-emitting elements 130 and insulated from the second electrode 133 of the other light-emitting element 130.

[0049] In one application scenario, see Figure 7 as well as Figure 8 When there are multiple light-emitting elements 130, there are also multiple auxiliary electrodes 140. In this case, the multiple auxiliary electrodes 140 are spaced apart. Specifically, the multiple auxiliary electrodes 140 spaced apart can be insulated from each other. In this case, one auxiliary electrode 140 can be electrically connected to the second electrodes 133 of the multiple light-emitting elements 130, so that a voltage can be applied to the second electrodes 133 of the multiple light-emitting elements 130 at the same time through the same auxiliary electrode 140.

[0050] And in Figure 7 as well as Figure 8In the application scenario, the light-emitting elements 130 where the second electrodes 133 connected to the same auxiliary electrode 140 are located can be set to have the same luminous color, so that for the light-emitting elements 130 with the same color, the voltage applied to their second electrodes 133 can be the same, and the luminous brightness of the light-emitting elements 130 with the same color can be ensured to be the same. In addition, the second electrodes 133 of the light-emitting elements 130 with different colors can be connected to different auxiliary electrodes 140, so that for the light-emitting elements 130 with different colors, the voltage applied to the second electrodes 133 of the light-emitting elements 130 with different colors can be different, that is, different V SS voltage to reduce power consumption.

[0051] In order to ensure that the auxiliary electrode 140 can be electrically connected to the second electrodes 133 of a plurality of light emitting elements 130 at the same time, the auxiliary electrode 140 can be in a grid structure.

[0052] 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 may correspond one-to-one to a plurality of auxiliary electrodes 140 , and the second electrodes 133 of the light-emitting elements 130 may be electrically connected to the auxiliary electrodes 140 corresponding to the light-emitting elements 130 .

[0053] In other embodiments, the auxiliary electrode 140 may also be in a strip-shaped, block-shaped, or other structure.

[0054] Continue reading Figure 7 as well as Figure 8 In one application scenario, the plurality of light emitting elements 130 are arranged in a plurality of rows and a plurality of columns. Figure 7 As shown, the light emitting elements 130 in the same column have the same light emitting color, and the light emitting elements 130 in two adjacent columns have different light emitting colors. For example, the light emitting colors of the light emitting elements 130 in the same column are all red, or all green, or all blue. Of course, in other embodiments, the light emitting colors of the light emitting elements 130 in the same column may also be different, which is not limited here.

[0055] See also Figure 7 as well as Figure 8 The second electrodes 133 of the light emitting elements 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 elements 130 in the same column are the same.

[0056] Continue reading Figure 7 At this time, 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 can be different, that is, different V SSvoltage, which can save power consumption.

[0057] See also Figure 8 ,and Figure 7 The difference between the embodiments is that at this time, the second electrodes 133 of the light emitting elements 130 in some adjacent columns are electrically connected to the same auxiliary electrode 140, and the second electrodes 133 of the light emitting elements 130 in another part of adjacent columns are electrically connected to different auxiliary electrodes 140. That is, at this time, 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.

[0058] In summary, the present application does not impose any specific limitation on the arrangement of the auxiliary electrode 140 .

[0059] Continue reading Figure 5 as well as Figure 6 In this embodiment, the auxiliary electrode 140 is electrically connected to the second electrode region 11213 of the active layer 1121 in the initialization transistor 112 through the via 10, so that in the initialization stage, the initialization transistor 112 transmits the voltage on the auxiliary electrode 140 to the pixel circuit to initialize the pixel circuit.

[0060] Specifically, it can be seen from the above analysis that the voltage written into the pixel circuit in the initialization stage and the voltage applied to the second electrode 133 of the light-emitting element 130 are negative voltages. Therefore, the present application takes this into consideration and directly sets the auxiliary electrode 140 to be electrically connected to the second electrode region 11213 of the active layer 1121 in the initialization transistor 112 through the via 10, so that the pixel circuit can be directly initialized using the voltage on 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, so that there is no need to set an initial voltage signal line electrically connected to the second electrode of the initialization transistor 112. On the one hand, the light transmittance of the display panel 100 can be improved, and on the other hand, space can be saved, so that more light-emitting elements 130 can be set in the same space, thereby improving the PPI (Pixels Per Inch, pixel density unit) of the display panel 100. In addition, when a voltage is applied to the auxiliary electrode 140, the auxiliary electrode 140 has good conductivity, which can reduce the voltage drop and ensure the uniformity of the pixel circuit reset. In other words, the design of the present application can improve the performance of the display panel 100.

[0061] See also Figure 5 as well as Fig. 9 , Fig. 9 yes Figure 5 The circuit structure diagram of the pixel circuit in the first application scenario, at this time, the pixel circuit also includes a driving transistor 113 (with Figure 2 , Figure 4 The function of the seventh transistor M7 is the same as that of the first transistor M7 in the figure), the driving transistor 113 is used to generate a driving current to drive the light-emitting element 130 to emit light, and the initialization transistor 112 includes a first initialization transistor 116 (in the accompanying drawings, the active layer, the gate, the channel region of the active layer, the first pole, and the second pole region of the first initialization transistor 116 are labeled with 1161, 1162, 11611, 11612, and 11613, respectively), and the via 10 includes a first via 40. At this time, the second pole 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 40, and the first pole region 11612 of the active layer 1161 of the first initialization transistor 116 is electrically connected to the gate of the driving transistor 113, so that the first initialization transistor 116 transmits the voltage applied to the auxiliary electrode 140 to the gate of the driving transistor 113.

[0062] Specifically, in this application scenario, the role of the first initialization transistor 116 is similar to Figure 2 , Figure 4 The fifth transistor M5 has the same function, that is, after being turned on, it transmits the reference voltage to the gate of the driving transistor 113. Specifically, the gate 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 of the driving transistor 113, and the second electrode of the first initialization transistor 116 is electrically connected to the second electrode 133 of the light emitting element 130. Therefore, in the first initialization stage, the first initialization transistor 116 is turned on, and the second power line V SS The second voltage signal on the first electrode 131 of the light emitting element 130 is transmitted to the first electrode 131 of the light emitting element 130, that is, the voltage on the second electrode 133 of the light emitting element 130 is transmitted to the gate of the driving transistor 113 to initialize the gate voltage of the driving transistor 113.

[0063] 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. Fig. 9 The first initialization transistor 116 is illustrated as a double-gate thin film transistor.

[0064] Continue reading Fig. 9 At this time, in the first application scenario, the pixel circuit further includes a second initialization transistor 118, the gate of the second initialization transistor 118 is connected to the scanning signal line Sn-1 of the previous pixel row, 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 initial voltage signal line V REF2 In other embodiments, the gate of the second initialization transistor 118 may also be connected to the scanning signal line of other rows.

[0065] At this time, in the first initialization stage, the first initialization transistor 112 is turned on, and the voltage on the second electrode 133 of the light-emitting element 130 is transmitted to the gate of the driving transistor 113, and in the second initialization stage, the second initialization transistor 118 is turned on, and the second initial voltage signal line V REF2 The voltage on the first electrode 131 is transmitted to the first electrode 131 of the light emitting element 130. The first initialization stage and the second initialization stage may be the same stage or two different stages in the initialization stage.

[0066] Continue reading Fig. 9 The pixel circuit further includes a first light emission control transistor M3 and a second light emission control transistor M6. The gates of the first light emission control transistor M3 and the second light emission control transistor M6 are electrically connected to the light emission control line EM. The first electrode of the first light emission control transistor M3 is electrically connected to the first power line V DD The second electrode of the first light emitting control transistor M3 is electrically connected to the first electrode of the driving transistor 113 , the first electrode of the second light emitting control transistor M6 is electrically connected to the second electrode of the driving transistor 113 , and the second electrode of the second light emitting control transistor M6 is electrically connected to the first electrode 131 of the light emitting element 130 .

[0067] It should be noted that in the first application scenario, in addition to the above-mentioned parts, other components and connection relationships in the pixel circuit are the same as those in the first application scenario. Figure 2 , Figure 4 The corresponding components and connection relationships are the same, as shown in the following example. Fig. 9 It should be noted that in the drawings of the present application, the active layer, the gate, the channel region of the active layer, the first electrode region, and the second electrode region of the second initialization transistor 118 are labeled 1181, 1182, 11811, 11812, and 11813, respectively.

[0068] See also Fig.10 ,and Fig. 9 The application scenario is different in that, in the second application scenario of the present embodiment, in the first initialization stage, the first initialization transistor 116 is turned on, and the first initial voltage signal line V REF1 The voltage on the second power line V is transmitted to the gate of the driving transistor 113. In the second initialization stage, the second initialization transistor 118 is turned on, and the second power line V SS The second voltage signal on the first electrode 131 of the light emitting element 130 is transmitted to the first electrode 131 of the light emitting element 130, that is, the voltage on the second electrode 133 of the light emitting element 130 is transmitted to the first electrode 131 of the light emitting element 130. Specifically, at this time, the second 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 through the second via hole ( Fig.10The first electrode region of the active layer in the second initialization transistor 118 is electrically connected to the first electrode 131. That is, at this time, 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 133 of the light-emitting element 130. In the second initialization stage, the second initialization transistor 118 is turned on, and the second power line V SS The second voltage signal on the light emitting element 130 is transmitted to the first electrode 131 of the light emitting element 130 , that is, the voltage on 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 .

[0069] The gate 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 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 The first initialization transistor 116 is electrically connected so 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 on φ1 is transmitted to the gate of the driving transistor 113.

[0070] 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, wherein Fig.10 The first initialization transistor 116 is illustrated as a double-gate thin film transistor.

[0071] It should be noted that in the second application scenario, in addition to the above-mentioned parts, other components and connection relationships in the pixel circuit are the same as those in the second application scenario. Figure 2 , Figure 4 The corresponding components and connection relationships are the same, as shown in the following example. Fig.10 shown.

[0072] See also Fig.11 as well as Fig.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 on the first electrode 131 of the light emitting element 130 is transmitted to the gate 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 on the first electrode 131 of the light emitting element 130 is transmitted to the first electrode 131 of the light emitting element 130, that is, the voltage on the second electrode 133 of the light emitting element 130 is transmitted to the first electrode 131 of the light emitting element 130. Specifically, at this time, 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 first electrode region 11612 in the active layer 1161 of the first initialization transistor 116 is electrically connected to the gate of the driving transistor 113. The gate of the first initialization transistor 116 ( Fig.12 The second initialization transistor 118 has a second electrode region 11813 and an auxiliary electrode 140 connected to the scanning signal line Sn-1 of the previous pixel row; the second initialization transistor 118 has an active layer 11813 and an auxiliary electrode 140 connected to the scanning signal line Sn-1 of the previous pixel row through the second via hole 60, and the first electrode region 11812 and the first electrode 131 of the active layer 1181 of the second initialization transistor 118 are electrically connected to the first electrode 131 of the light emitting element 130 ( Fig.12 The connection relationship is not shown in the figure), the gate of the second initialization transistor 118 ( Fig.12 The gate of the second initialization transistor 118 is connected to the scanning signal line Sn-1 of the previous pixel row (indicated by reference numeral 1182). In other embodiments, the gate of the second initialization transistor 118 may also be connected to the scanning signal lines of other rows.

[0073] At this time, in the first initialization stage, the first initialization transistor 112 is turned on, and the voltage on the second electrode 133 of the light emitting element 130 is transmitted to the gate of the driving transistor 113, and in the second initialization stage, the second initialization transistor 118 is turned on, and the voltage on 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, at this time, the voltage on the second electrode 133 of the light emitting element 130 is simultaneously used, that is, the second power line V SS The second voltage signal on the driving transistor 113 and the first electrode 131 of the light emitting element 130 are reset.

[0074] Meanwhile, in the third application scenario, the first initialization transistor 116 may be a single-gate thin film transistor or a double-gate thin film transistor, wherein Fig.11 The first initialization transistor 116 is illustrated as a double-gate thin film transistor.

[0075] It should be noted that in the third application scenario, in addition to the above-mentioned parts, other components and connection relationships in the pixel circuit are the same as those in the third application scenario. Figure 2 , Figure 4 The corresponding components and connection relationships are the same, as shown in the following example. Fig.11 shown.

[0076] It can be understood that in the third application scenario, that is, the active layer 1121 of the first initialization transistor 116 is electrically connected to the auxiliary electrode 140 through the first via 40, and the active layer 1181 of the second initialization transistor 118 is electrically connected to the auxiliary electrode 140 through the second via 60, and the first initialization voltage signal line V may not be prepared. REF1 and the second initial voltage signal line V REF2 Compared with the above two application scenarios, it can further save space and improve the light transmittance and PPI of the display panel 100.

[0077] It can be seen from the above content that the present application can only set the second polar region 11613 of the active layer 1161 of the first initialization transistor 116 to be electrically connected to the auxiliary electrode 140 through the first via hole 40, or only set the second polar region 11813 of the active layer 1181 of the second initialization transistor 118 to be electrically connected to the auxiliary electrode 140 through the second via hole 60, or simultaneously set the second polar region 11613 of the active layer 1161 of the first initialization transistor 116 to be electrically connected to the auxiliary electrode 140 through the first via hole 40, and the second polar region 11813 of the active layer 1181 of the second initialization transistor 118 to be electrically connected to the auxiliary electrode 140 through the second via hole 60, that is, only the second power line V SS The second voltage signal on the second electrode 133 of the light emitting element 130 is used to reset the gate of the driving transistor 113, or the second power line V SS The second voltage signal on the second electrode 133 of the light emitting element 130 is used to reset the first electrode 131 of the light emitting element 130, and the second power line V SS The second voltage signal on the light emitting element 130 is used to reset the gate of the driving transistor 113 by using the voltage on the second electrode 133 of the light emitting element 130, and the voltage on the second electrode 133 of the light emitting element 130 is used to reset the first electrode 131 of the light emitting element 130.

[0078] Continue reading Figure 5 When there are multiple light-emitting elements 130, there are also multiple vias 10, and the light-emitting elements 130 correspond to the vias 10 one by one. The one-to-one correspondence between the light-emitting elements 130 and the vias 10 means that, for any light-emitting element 130, the second electrode region 11213 of the active layer 1121 in the initialization transistor 112 of the pixel circuit electrically connected to the light-emitting element 130 is electrically connected to the auxiliary electrode 140 through the via 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 by using the voltage applied to the auxiliary electrode 140 and the second electrode 133 in the light-emitting element 130.

[0079] Continue reading Figure 5 The via 10 is located between adjacent light emitting elements 130, that is, 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 the area corresponding to the pixel opening. This setting can reduce the difficulty of the manufacturing process, improve the manufacturing efficiency, and ensure the product yield.

[0080] At the same time, the orthographic projection of the auxiliary electrode 140 on the substrate 110 covers the orthographic projection of the via hole 10 on the substrate 110. This arrangement can ensure the electrical connection between the auxiliary electrode 140 and the via hole 10, and avoid the disconnection between the auxiliary electrode 140 and the via hole 10.

[0081] See also Fig.12 , the via 10 includes a plurality of hole segments 11 that are electrically connected in sequence. Specifically, in order to reduce the difficulty of the preparation process, during preparation, the via 10 is formed in segments, that is, the via 10 is formed through multiple patterning processes. Of course, in other embodiments, if the process conditions permit, the via 10 can also be formed at one time, that is, the via 10 is formed through one patterning process.

[0082] Continue reading Fig.12 Considering that the strength of the display panel 100 at the hole segment 11 will be reduced when the hole segment 11 is formed by a composition process, at least part of the hole segments 11 are arranged at intervals on the substrate 110, that is, at least part of the hole segments 11 are staggered, so as to avoid all the hole segments 11 being concentrated in a straight line.

[0083] The orthographic projections of all the hole segments 11 on the substrate 110 may be arranged at intervals, or the orthographic projections of only some of the hole segments 11 on the substrate 110 may be arranged at intervals, while the orthographic projections of other hole segments 11 on the substrate 110 at least partially overlap.

[0084] Continue reading Fig.12 In one embodiment, the display panel 100 further includes a first connection electrode 134 and a second connection electrode 135, and the auxiliary electrode 140 is electrically connected to the second polar region 1123 of the active layer 1121 in the initialization transistor 112 through the first connection electrode 134 and the second connection electrode 135. In other words, the auxiliary electrode 140 is not directly electrically connected to the second polar region 1123 of the active layer 1121 in the initialization transistor 112, but is electrically connected to the second polar region 1123 of the active layer 1121 in the initialization transistor 112 through the first connection electrode 134 and the second connection electrode 135. This arrangement can reduce the difficulty of the process and reduce the transmission resistance.

[0085] Continue reading Fig.12, the plurality of hole segments 11 include 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, and the first target hole segment 101 exposes the upper surface of the first connection electrode 134, the lower surface of the auxiliary electrode 140 contacts the upper surface of the first connection electrode 134, the first connection electrode 134 fills the second target hole segment 102, the lower surface of the first connection electrode 134 contacts the upper surface of the second connection electrode 135, the second connection electrode 135 fills the third target hole segment 103, and the third target hole segment 103 exposes the upper surface of the second polar region 11213 of the active layer 1121 in the initialization transistor 112, and the lower surface of the second connection electrode 135 contacts the upper surface of the second polar region 11213 of the active layer 1121 in the initialization transistor 112.

[0086] Specifically, during preparation, the third target hole segment 103 is formed first, then the second connecting electrode 135 is formed, the second connecting electrode 135 is filled in the third target hole segment 103, then the second target hole segment 102 and the first connecting electrode 134 are formed, the first connecting electrode 134 is filled in the second target hole segment 102, then the first target hole segment 101 is formed, and finally the auxiliary electrode 140 is formed, and the auxiliary electrode 140 is filled in the first target hole segment 101.

[0087] The materials of the first connection electrode 134 and the second connection electrode 135 may be the same or different, which is not limited here.

[0088] Among them, see 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, in order to ensure the strength of the display panel 100, the first via hole 40 and the second via hole 60 are spaced apart.

[0089] See also Fig.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. At this time, in order to improve the manufacturing efficiency and reduce the patterning process, at least part of the first hole segments 41 are reused as at least part of the second hole segments 61. That is to say, at this time, there is a first hole segment 41, which is both the first hole segment 41 and the second hole segment 61. This setting can reduce the number of openings during the manufacturing process, which can ensure the strength of the display panel 100 and improve the manufacturing efficiency.

[0090] Continue reading Figure 5 The display panel 100 further includes a pixel definition layer 160 and an encapsulation layer 170 .

[0091] The pixel definition layer 160 is arranged on the side of the pixel circuit layer 120 away from the substrate 110, and the pixel definition layer 160 is provided with a pixel opening, at least part of the light-emitting element 130 is formed in the pixel opening, and the pixel opening exposes the first electrode 131 of the light-emitting element 130, wherein the auxiliary electrode 140 is arranged on the side of the pixel definition layer 160 away from the substrate 110, and the second electrode 133 extends from the pixel opening to the side wall of the auxiliary electrode 140.

[0092] Specifically, the pixel definition layer 160 may be formed of an organic material such as polyimide (PI), polyamide, benzocyclobutene (BCB), acrylic resin or phenolic resin, or an inorganic material such as SiNx, or the pixel definition layer 160 may include both organic and inorganic materials. At the same time, the first electrode 131 is exposed in the pixel opening, and the light-emitting material layer 132 may be formed entirely in the pixel opening, or may be partially formed in the pixel opening. For example, in one application scenario, the light-emitting material layer 132 is partially formed in the pixel opening, and partially extends to the side of the pixel definition layer 160 away from the substrate 110, while the second electrode 133 is partially formed in the pixel opening, and partially extends from the pixel opening to the side of the pixel definition layer 160 away from the substrate 110 and to the sidewall of the auxiliary electrode 140, thereby realizing electrical connection between the second electrode 133 and the auxiliary electrode 140. In one embodiment, the via 10 passes through the pixel definition layer 160.

[0093] The encapsulation layer 170 is arranged on the side of the light-emitting element 130 facing away from the substrate 110, that is, on the side of the pixel definition layer 160 facing away from the substrate 110. At the same time, the orthographic projection of the encapsulation layer 170 on the substrate 110 covers the orthographic projection of the light-emitting element 130 on the substrate 110, and the encapsulation layer 170 extends to a portion of the surface of the auxiliary electrode 140.

[0094] Specifically, the encapsulation layer 170 is used to seal the light-emitting element 130. The encapsulation layer 170 can prevent external water vapor from invading the light-emitting element 130, the auxiliary electrode 140 and other structures, and can play a protective role. The encapsulation layer 170 can be a thin film encapsulation layer, including a first inorganic encapsulation layer, a first organic encapsulation layer and a second inorganic encapsulation layer arranged in sequence in a direction away from the substrate 110. The encapsulation layer 170 can include any number of stacked organic encapsulation layers and inorganic encapsulation layers as needed, and this application does not make specific restrictions.

[0095] Continue reading Figure 5 In order to reduce the transmission impedance and ensure the electrical connection between the auxiliary electrode 140 and the second electrode 133 to avoid disconnection, the thickness of the auxiliary electrode 140 is greater than the thickness of the second electrode 133 .

[0096] Continue reading Figure 5The 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. At the same time, the second electrode 133 extends to the side wall of the conductive layer 141. The conductive layer 141 plays a role in signal conduction, which is used to realize the electrical connection between the auxiliary electrode 140 and the second electrode 133. At the same time, the protective layer 142 is arranged on the side of the conductive layer 141 away from the substrate 110, and can be used to protect the conductive layer 141. Among them, the material of the conductive layer 141 can include at least one of aluminum, copper, and gold. In an application scenario, the material of the conductive layer 141 is aluminum; the material of the protective layer 142 includes titanium. In summary, the present application does not limit the materials of the conductive layer 141 and the protective layer 142.

[0097] In order to further enhance the protective effect of the protective layer 142, refer to Figure 5 , the orthographic projection of the protective layer 142 on the substrate 110 covers the orthographic projection of the conductive layer 141 on the substrate 110, that is, the protective layer 142 covers the entire surface of the conductive layer 141. In an application scenario, Figure 5 As shown, along a direction parallel to the substrate 110 , the protection layer 142 protrudes from the conductive layer 141 , that is, the orthographic projection of the protection layer 142 on the substrate 110 extends to the outside of the orthographic projection of the conductive layer 141 on the substrate 110 .

[0098] It should be noted that, in other embodiments, the protection layer 142 may only cover a portion of the surface of the conductive layer 141 , or cover the entire surface of the conductive layer 141 facing away from the substrate 110 without protruding from the conductive layer 141 in a direction parallel to the substrate 110 .

[0099] See also Figure 5 In order to ensure better contact between the second electrode 133 and the conductive layer 141 so that the second electrode 133 has a better climbing effect, the cross-section of the conductive layer 141 perpendicular to the substrate 110 is a right trapezoid. Of course, in other embodiments, the cross-section of the conductive layer 141 perpendicular to the substrate 110 can also be a rectangle, a triangle, or other shapes, which are not limited here.

[0100] For the above-mentioned film layers, see Figure 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 .

[0101] The first insulating layer 181 is used to realize the insulation between the active layer and the gate of each transistor, so the first insulating layer 181 can also be called a gate insulating layer (GI); the second insulating layer 182 is used to realize the capacitor ( Figure 5The interlayer dielectric layer 183 may be formed of an inorganic insulating layer such as silicon oxide or silicon nitride, or may be formed of an organic insulating material, which is not limited here; the passivation layer 184 may be formed of an inorganic material such as silicon oxide or silicon nitride, or may be formed of an organic material; the first planarization layer 185 is located on the passivation layer 184, and the first planarization layer 185 includes an organic material such as acrylic, polyimide (PI) or benzocyclobutene (BCB), and the first planarization layer 185 has a planarization effect; the second planarization layer 186 is located on the first planarization layer 185, and on the one hand, has a planarization effect to further ensure the flatness of the display panel 100, and on the other hand, can also increase the length of the via 10. Among them, the materials of the second planarization layer 186 and the first planarization layer 185 can be the same or different, and can be set according to actual needs.

[0102] Among them, structures such as the first insulating layer 181, the second insulating layer 182, the interlayer dielectric layer 183, the passivation layer 184, the first planarization layer 185 and the second planarization layer 186 all belong to the prior art and will not be introduced one by one here.

[0103] In addition, the present application also includes a display device, which includes the display panel 100 in any of the above-mentioned embodiments. The specific structure can be found in the above-mentioned related content, wherein the display device can be any device with restricted functions such as a mobile phone, a computer, a game console, etc., and is not limited here.

[0104] The above description is only 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 using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display panel, characterized in that: The display panel comprises: substrate; A pixel circuit layer, arranged on one side of the substrate, comprising a pixel circuit, wherein the pixel circuit comprises an initialization transistor, and an active layer of the initialization transistor comprises a channel region and a first polar region and a second polar region located on both sides of the channel region; A light emitting element, arranged on a side of the pixel circuit layer away from the substrate and electrically connected to the pixel circuit, the light emitting element comprising a first electrode, a light emitting material layer and a second electrode arranged in layers; The auxiliary electrode is arranged on the side of the pixel circuit layer away from the substrate and is electrically connected to the second electrode. The auxiliary electrode is electrically connected to the second electrode region of the active layer in the initialization transistor through a via hole.

2. The display panel according to claim 1, characterized in that: The pixel circuit further includes a driving transistor, the driving transistor is used to generate a driving current to drive the light-emitting element to emit light, the initialization transistor includes a first initialization transistor, the via hole includes a first via hole, the second electrode region of the active layer in the first initialization transistor is electrically connected to the auxiliary electrode through the first via hole, and the first electrode region of the active layer in the first initialization transistor is electrically connected to the gate of the driving transistor, so that the first initialization transistor transmits the voltage applied to the auxiliary electrode to the gate of the driving transistor; Preferably, the pixel circuit also includes a first light-emitting control transistor and a second light-emitting control transistor, the gates of the first light-emitting control transistor and the second light-emitting control transistor are electrically connected to a light-emitting control line, the first electrode of the first light-emitting control transistor is electrically connected to a first power supply line, the second electrode of the first light-emitting control transistor is electrically connected to the first electrode of the driving transistor, the first electrode of the second light-emitting control transistor is electrically connected to the second electrode of the driving transistor, and the second electrode of the second light-emitting control transistor is electrically connected to the first electrode of the light-emitting element.

3. The display panel according to claim 2, characterized in that: The initialization transistor further includes a second initialization transistor, and an active layer of the second initialization transistor includes a channel region and a first polar region and a second polar region located on both sides of the channel region of the second initialization transistor; Wherein, the via includes a second via, the first electrode region of the active layer in the second initialization transistor is electrically connected to the first electrode of the light-emitting element, and the second electrode region of the active layer in the second initialization transistor is electrically connected to the auxiliary electrode through the second via, so that the second initialization transistor transmits the voltage applied to the auxiliary electrode to the first electrode of the light-emitting element. Preferably, the first via and the second via are arranged at intervals, or the first via includes a plurality of first hole segments electrically connected in sequence, and the second via includes a plurality of second hole segments electrically connected in sequence, wherein at least part of the first hole segments are reused as at least part of the second hole segments.

4. The display panel according to claim 1, characterized in that: The initialization transistor includes a second initialization transistor, the via includes a second via, the second electrode region of the active layer in the second initialization transistor is electrically connected to the auxiliary electrode via the second via, and the first electrode region of the active layer in the second initialization transistor is electrically connected to the first electrode of the light-emitting element, so that the second initialization transistor transmits the voltage applied to the auxiliary electrode to the first electrode of the light-emitting element.

5. The display panel according to claim 1, characterized in that: The via hole comprises a plurality of hole segments; Preferably, at least some of the hole segments are arranged at intervals in their orthographic projections on the substrate. Preferably, the display panel further comprises a first connecting electrode and a second connecting electrode, and the auxiliary electrode is electrically connected to the second electrode region of the active layer in the initialization transistor through the first connecting electrode and the second connecting electrode; Preferably, the multiple hole segments include a first target hole segment, a second target hole segment and a third target hole segment, the auxiliary electrode fills the first target hole segment, and the first target hole segment exposes the upper surface of the first connecting electrode, the lower surface of the auxiliary electrode contacts the upper surface of the first connecting electrode, the first connecting electrode fills the second target hole segment, the lower surface of the first connecting electrode contacts the upper surface of the second connecting electrode, the second connecting electrode fills the third target hole segment, and the third target hole segment exposes the upper surface of the second polar region of the active layer in the initialization transistor, and the lower surface of the second connecting electrode contacts the upper surface of the second polar region of the active layer in the initialization transistor.

6. The display panel according to claim 1, characterized in that: The display panel further includes: a pixel definition layer, arranged on a side of the pixel circuit layer away from the substrate, the pixel definition layer being provided with a pixel opening, at least a portion of the light emitting element being formed in the pixel opening, the pixel opening exposing the first electrode of the light emitting element, the auxiliary electrode being arranged on a side of the pixel definition layer away from the substrate, and the second electrode extending from the pixel opening to a side wall of the auxiliary electrode; Preferably, the via hole penetrates the pixel definition layer; Preferably, the display panel further includes: The encapsulation layer is arranged on the side of the light emitting element away from the substrate, the orthographic projection of the encapsulation layer on the substrate covers the orthographic projection of the light emitting element on the substrate, and the encapsulation layer extends to a part of the surface of the auxiliary electrode.

7. The display panel according to claim 1, characterized in that: The thickness of the auxiliary electrode is greater than the thickness of the second electrode; Preferably, the auxiliary electrode comprises: A conductive layer, wherein the second electrode extends to a side wall of the conductive layer; A protective layer, disposed on a side of the conductive layer away from the substrate; Preferably, the orthographic projection of the protective layer on the substrate covers the orthographic projection of the conductive layer on the substrate; Preferably, the material of the conductive layer includes aluminum; Preferably, the material of the protective layer includes titanium; Preferably, a cross section of the conductive layer perpendicular to the substrate is a regular trapezoid.

8. The display panel according to claim 1, characterized in that: The number of the light-emitting elements is multiple, the number of the auxiliary electrodes is multiple, and the multiple auxiliary electrodes are arranged at intervals; Wherein, the light emitting elements where the second electrodes connected to the same auxiliary electrode are located have the same light emitting color; Preferably, the auxiliary electrode is in a grid structure; Preferably, the display panel further comprises a second power line for providing 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 display panel according to claim 1, characterized in that: The number of the light-emitting elements is multiple, and the auxiliary electrode is located between adjacent light-emitting elements; Preferably, there are multiple via holes, and the light emitting elements correspond to the via holes one by one; Preferably, the via hole is located between adjacent light-emitting elements; Preferably, the orthographic projection of the auxiliary electrode on the substrate covers the orthographic projection of the via hole on the substrate.

10. The display panel according to claim 1, characterized in that: The number of the light emitting elements is multiple, and the multiple light emitting elements are arranged in multiple rows and columns; Wherein, the second electrodes of the light-emitting elements in the same column are electrically connected to the same auxiliary electrode; Preferably, 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 some adjacent columns are electrically connected to the same auxiliary electrode, and the second electrodes of the light-emitting elements in another part of adjacent columns are electrically connected to different auxiliary electrodes; Preferably, the light emitting elements in the same column have the same light emitting color, and the light emitting elements in adjacent columns have different light emitting colors.

11. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 10.

Images