Display panel and display device

Abstract

Embodiments of the present application disclose a display panel and a display device. The display panel comprises an array substrate and a cathode. The array substrate has a display area and a non-display area, the display area comprises a first display area and a second display area, the light transmittance of the first display area is greater than that of the second display area. The cathode is located on one side of the array substrate and is arranged in the display area and the non-display area. The array substrate comprises a cathode trace and an auxiliary electrode. The cathode trace is located in the non-display area, the cathode trace is connected with the cathode, the auxiliary electrode is arranged in at least the first display area and the second display area, the auxiliary electrode is connected with the cathode trace, and the auxiliary electrode in the first display area is made of a light-transmitting conductive material. The technical scheme of the embodiments of the present application is helpful to improve display uniformity and reduce power consumption.

Description

TECHNICAL FIELD

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

[0002] With the continuous development of display technology, the size of display panel is getting larger and larger, the number of pixels per inch of display panel is getting more and more, and people's requirements for display effect of display panel are getting higher and higher. At present, the existing display panel has the problem of poor display uniformity, which affects the display effect. SUMMARY

[0003] Embodiments of the present application provide a display panel and a display device to improve display uniformity and reduce power consumption.

[0004] In a first aspect, embodiments of the present application provide a display panel, comprising:

[0005] an array substrate having a display area and a non-display area, the display area comprising a first display area and a second display area, the light transmittance of the first display area being greater than that of the second display area;

[0006] a cathode located on one side of the array substrate and disposed in the display area and the non-display area;

[0007] wherein the array substrate comprises a cathode trace and an auxiliary electrode, the cathode trace is located in the non-display area, the cathode trace is connected to the cathode, the auxiliary electrode is disposed in at least the first display area and the second display area, the auxiliary electrode is connected to the cathode trace, and the auxiliary electrode in the first display area is made of a light-transmitting conductive material.

[0008] Optionally, the array substrate further comprises an anode and a thin film transistor, the thin film transistor comprises a plurality of metal layers, a metal layer farthest from the anode in the plurality of metal layers is a first metal layer, and the auxiliary electrode is disposed in the same layer as at least one of the first metal layer and a metal layer between the first metal layer and the anode.

[0009] Optionally, the auxiliary electrode comprises a first electrode part and a second electrode part, the first electrode part is located in the first display area, the second electrode part is located in the second display area, the second electrode part is overlapped with the cathode trace, and the first electrode part is made of a light-transmitting conductive material.

[0010] Preferably, the second electrode part covers the second display area in the arrangement area, or the second electrode part is a planar electrode part with a hollow area.

[0011] Preferably, the second electrode part and the first electrode part are made of the same material.

[0012] Optionally, the second electrode part is a planar electrode having a plurality of hollow regions, at least one of the hollow regions is a via hole, and the anode is connected to the source / drain of the thin film transistor through the via hole.

[0013] Optionally, a vertical projection of the first electrode part on the array substrate overlaps with a vertical projection of the anode and / or the gate of the thin film transistor on the array substrate.

[0014] Optionally, the first electrode part comprises at least one sub-electrode part, the sub-electrode part is insulated from the second electrode part, and a vertical projection of at least part of the sub-electrode part on the array substrate overlaps with a vertical projection of the anode and / or the gate of the thin film transistor on the array substrate.

[0015] Optionally, the number of the auxiliary electrodes is at least one; when the number of the auxiliary electrodes is greater than or equal to two, each of the auxiliary electrodes is arranged in a stack in the array substrate.

[0016] Optionally, the non-display area comprises a first non-display area and a second non-display area located on two sides of the display area, the cathode trace comprises a first trace part and a second trace part, the first trace part is located in the first non-display area, the second trace part is located in the second non-display area, the first trace part and the second trace part are both overlapped with the cathode, one side of the auxiliary electrode is overlapped with the first trace part, and the other side of the auxiliary electrode is overlapped with the second trace part.

[0017] Optionally, the array substrate further comprises a capacitor, and the cathode trace is arranged in the same layer as any one of a plate of the capacitor, a source / drain of a thin film transistor in the array substrate, a gate of the thin film transistor, and the auxiliary electrode.

[0018] In a second aspect, an embodiment of the present application provides a display device comprising the display panel of the first aspect.

[0019] The display panel and display device provided in this invention employ an array substrate having a display area and a non-display area. The display area includes a first display area and a second display area, with the first display area having a higher transmittance than the second display area. By setting cathode traces and auxiliary electrodes in the array substrate, the cathode traces connect to the cathode in the non-display area, and the auxiliary electrodes are at least located in the first and second display areas and connected to the cathode traces. This allows the auxiliary electrodes to be electrically connected to the cathode through the cathode traces, making the overall equivalent resistance of the cathode and auxiliary electrodes lower than the resistance of the cathode itself. This helps reduce the voltage drop across the cathode, minimizing signal differences between different areas of the cathode, thereby reducing the driving current differences between different areas of the display area and improving display uniformity. It also reduces the power consumption of the display panel. Furthermore, the auxiliary electrodes in the first display area are made of a light-transmitting and conductive material, which helps to reduce the cathode voltage drop while preventing the auxiliary electrodes from affecting the transmittance of the first display area.

[0020] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a top view diagram of a display panel structure in related technologies;

[0023] Figure 2 This is a top view structural diagram of a display panel provided in an embodiment of the present invention;

[0024] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure obtained by cutting the display panel along section line BB';

[0025] Figure 4 This is a top view schematic diagram of another display panel provided in an embodiment of the present invention;

[0026] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure obtained by cutting the display panel along section line CC';

[0027] Figure 6 yes Figure 4A cross-sectional structure diagram of the display panel in FIG. 1 along the cross-sectional line DD'. DETAILED DESCRIPTION

[0028] In order to make the personnel in the technical field better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person of ordinary skill in the art without creative labor should belong to the scope of protection of the present application.

[0029] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0030] As described in the background, the existing display panel has the problem of poor display uniformity, which affects the display effect. The inventor found that the reasons for the above problems are as follows. Figure 1 is a schematic diagram of a top view structure of a display panel in the related art. Referring to Figure 1 The display panel can be an organic light-emitting diode (OLED) display panel or the like, and has a display area AA and a non-display area NAA. The display panel includes a cathode 100, which is generally a full-surface electrode covering the display area AA and the non-display area NAA. The size of the cathode 100 is large, and the light transmittance requirement of the cathode 100 is high, so that the thickness of the cathode 100 is thin and the resistance of the cathode 100 is large. The driving current of the display panel flows through the cathode 100 to generate an IR drop. The greater the resistance of the cathode 100, the greater the IR drop on the cathode 100, and the IR drops generated by different regions of the cathode 100 are not consistent, resulting in a large difference in driving current in different regions of the display area AA, causing poor display uniformity and affecting the display effect. In addition, the greater the resistance of the cathode 100, the greater the power consumption of the display panel. Moreover, the size of the existing display panel is gradually increasing, which will also cause the resistance of the cathode 100 to be larger, thereby exacerbating the adverse effects of cathode resistance on display uniformity and power consumption.

[0031] To solve the above problems, the embodiment of the present application provides a display panel. Figure 2 is a schematic diagram of a top view structure of a display panel provided by the embodiment of the present application. Figure 3 is Figure 2 is a schematic diagram of a cross-sectional structure of the display panel in along the section line BB'. Figure 2 Only the cathode trace 110 and the auxiliary electrode 120 in the display panel are shown, and other structures are not specifically shown. In combination with Figure 2 and Figure 3 , the display panel provided by the embodiment of the present application includes an array substrate 10 and a cathode 20. The array substrate 10 has a display area and a non-display area NAA, the display area includes a first display area AA1 and a second display area AA2, the light transmittance of the first display area AA1 is greater than that of the second display area AA2. The cathode 20 is located on one side of the array substrate 10 and is arranged in the display area and the non-display area NAA. The array substrate 10 includes a cathode trace 110 and an auxiliary electrode 120, the cathode trace 110 is connected to the cathode 20 in the non-display area NAA, the auxiliary electrode 120 is arranged at least in the first display area AA1 and the second display area AA2, the auxiliary electrode 120 is connected to the cathode trace 110, and the auxiliary electrode 120 in the first display area AA1 is made of a light-transmitting conductive material.

[0032] Specifically, the display panel provided by the embodiment of the present application can be an organic light-emitting diode (OLED) display panel or a micro light-emitting diode (Micro-LED) display panel, etc. The non-display area NAA is located at the periphery of the display area, and the first display area AA1 and the second display area AA2 are both used for display. The second display area AA2 can be a normal display area, also known as a main screen area, and the first display area AA1 can be a light-transmitting display area, also known as a sub-screen area. The light transmittance of the first display area AA1 is greater than that of the second display area AA2, so that a light-sensitive element, such as an under-display camera (UDC), etc., can be arranged at a position corresponding to the first display area AA1 on the non-display side of the display panel. The second display area AA2 can surround the first display area AA1, or semi-enclose the first display area AA1, and the embodiment of the present application does not limit the specific position and shape of the first display area AA1 in the display area.

[0033] The display panel further includes a pixel circuit, an anode and a light-emitting layer, and the anode, the light-emitting layer and the cathode 20 can constitute a plurality of sub-pixel units, i.e., light-emitting devices, in the display panel. The pixel circuit can provide a driving current to the corresponding light-emitting device, so that the driving current flows between the anode and the cathode 20 of the light-emitting device, thereby driving the light-emitting device to emit light, so that the display panel can display. The setting area of the cathode 20 covers the first display area AA1, the second display area AA2 and the non-display area NAA, and the cathode 20 can be a planar electrode and serve as a common electrode of each light-emitting device. The cathode trace 110 is located in the non-display area NAA, and the cathode trace 110 is used to provide a power supply signal required for the operation of the light-emitting device to the cathode 20. For example, the cathode trace 110 can be electrically connected to a pad in the display panel, so that the driving chip can supply the power supply signal to the cathode trace 110 through the pad, and transmit the power supply signal to the cathode 20 through the cathode trace 110. The auxiliary electrode 120 can be a planar electrode arranged in the first display area AA1 and the second display area AA2, or a patterned electrode. The auxiliary electrode 120 is electrically connected to the cathode trace 110, that is, the auxiliary electrode 120 can be electrically connected to the cathode 20 through the cathode trace 110, so that the equivalent resistance of the cathode 20 and the auxiliary electrode 120 as a whole is lower than the resistance of the cathode 20 itself, thereby reducing the voltage drop on the cathode 20, reducing the signal difference of different regions of the cathode 20, and further reducing the driving current difference of different regions of the display area, which helps to improve the display uniformity.

[0034] In addition, the auxiliary electrode 120 in the first display area AA1 is made of a light-transmitting conductive material, which can be a conductive material with a light transmittance greater than a preset light transmittance. The size of the preset light transmittance can be set according to the light transmittance requirement of the first display area AA1. For example, the light-transmitting conductive material can be indium tin oxide (ITO) or indium zinc oxide (IZO). By setting the material of the auxiliary electrode 120 in the first display area AA1 as a light-transmitting conductive material, it is helpful to reduce the cathode voltage drop by using the auxiliary electrode 120 while avoiding the influence of the auxiliary electrode 120 on the light transmittance of the first display area AA1.

[0035] In summary, the technical scheme of the embodiment of the present application, the array substrate has a display area and a non-display area, the display area includes a first display area and a second display area, and the light transmittance of the first display area is greater than that of the second display area. By arranging the cathode trace and the auxiliary electrode in the array substrate, the cathode trace is connected with the cathode in the non-display area, the auxiliary electrode is arranged in at least the first display area and the second display area, and the auxiliary electrode is connected with the cathode trace, so that the auxiliary electrode can be electrically connected with the cathode through the cathode trace, so that the equivalent resistance of the cathode and the auxiliary electrode as a whole is lower than the resistance of the cathode itself, which helps to reduce the voltage drop on the cathode, makes the signal difference of different regions of the cathode smaller, thereby reducing the driving current difference of different regions of the display area, so as to improve the display uniformity, and at the same time, the power consumption of the display panel can be reduced. In addition, the auxiliary electrode in the first display area is made of a light-transmitting conductive material, which helps to reduce the cathode voltage drop while avoiding the auxiliary electrode affecting the light transmittance of the first display area.

[0036] Figure 4 is another top view structural schematic diagram of a display panel provided by the embodiment of the present application. Figure 5 is Figure 4 is a sectional view structural schematic diagram of the display panel in Figure 4 and Figure 5 On the basis of the above-mentioned embodiment, optionally, the array substrate 10 further includes a thin film transistor 140 and an anode 160, the thin film transistor 140 includes a plurality of metal layers, and a metal layer farthest from the anode 160 in the plurality of metal layers is a first metal layer M1, and the auxiliary electrode 120 is arranged in the same layer as at least one of the first metal layer M1 and a metal layer between the first metal layer M1 and the anode 160.

[0037] Specifically, the array substrate 10 further comprises a base 130 and a pixel circuit located on the base 130, the pixel circuit is located between the anode 160 and the base 130, and the base 130 can provide buffering, protection or support for the display panel. The pixel circuit comprises a thin film transistor 140 and a storage capacitor 150, the thin film transistor 140 comprises a semiconductor layer 141, a gate 142, a source 143 and a drain 144, the storage capacitor 150 comprises a first plate 151 and a second plate 152, the semiconductor layer 141 can be an active layer, the gate 142 of the thin film transistor 140 and the first plate 151 of the storage capacitor 150 are located on the first metal layer M1, the second plate 152 of the storage capacitor 150 is located on the second metal layer M2, and the source 143 and the drain 144 of the thin film transistor 140 are located on the third metal layer M3. The semiconductor layer 141, the first metal layer M1, the second metal layer M2 and the third metal layer M3 are all located between the anode 160 and the base 130, and are sequentially stacked on the side of the base 130 close to the anode 160, and the insulating layer is arranged between the semiconductor layer 141 and the first metal layer M1, between the first metal layer M1 and the second metal layer M2, and between the second metal layer M2 and the third metal layer M3.

[0038] The multi-layer metal layer of the thin film transistor 140 mentioned above comprises the first metal layer M1 and the third metal layer M3, and the metal layer between the first metal layer M1 and the anode 160 can comprise the second metal layer M2 and the third metal layer M3, and can further comprise other metal layers between the third metal layer M3 and the anode 160.

[0039] In an embodiment, the auxiliary electrode 120 can be arranged between the anode 160 and the thin film transistor 140, for example, the third metal layer M3 and the anode 160 further comprise a fourth metal layer M4, and the insulating layer is arranged between the third metal layer M3 and the fourth metal layer M4, the auxiliary electrode 120 can be arranged in the fourth metal layer M4, or in the case that the fourth metal layer M4 and the anode 160 further comprise a fifth metal layer, the auxiliary electrode 120 can also be arranged in the fifth metal layer. The advantage of such arrangement is that the auxiliary electrode 120 can be arranged by using the film layer between the anode 160 and the thin film transistor 140, and the auxiliary electrode 120 does not need to be arranged between the first metal layer M1 and the third metal layer M3, so as to avoid the auxiliary electrode 120 occupying the space of the first metal layer M1 to the third metal layer M3.

[0040] In other embodiments, when the space of the first metal layer M1, the second metal layer M2 or the third metal layer M3 is sufficient, the auxiliary electrode 120 can also be arranged in any one of the first metal layer M1, the second metal layer M2 and the third metal layer M3. The advantage of such arrangement is that it will not increase the thickness of the display panel, and it is not necessary to prepare an extra mask plate, so as to avoid increasing the process cost.

[0041] In combination Figure 4 And Figure 5 Optionally, the auxiliary electrode 120 comprises a first electrode part 121 and a second electrode part 122, the first electrode part 121 is located in the first display area AA1, and the second electrode part 122 is located in the second display area AA2. The second electrode part 122 is overlapped with the cathode wire 110, and the first electrode part 121 is made of a light-transmitting conductive material.

[0042] Specifically, the first electrode part 121 is made of a light-transmitting conductive material, which helps to avoid affecting the light transmittance of the first display area AA1. The first electrode part 121 can be indium tin oxide (ITO) or indium zinc oxide (IZO), and the material for making the second electrode part 122 and the first electrode part 121 can be the same, so as to form the first electrode part 121 and the second electrode part 122 in the same process. The first electrode part 121 and the second electrode part 122 can be electrically connected or can be insulated. When the first electrode part 121 and the second electrode part 122 are electrically connected, the second electrode part 122 is overlapped with the cathode wire 110, so that the first electrode part 121 and the second electrode part 122 are electrically connected with the cathode 20 through the cathode wire 110, the equivalent resistance of the cathode 20, the first electrode part 121 and the second electrode part 122 as a whole is lower than the resistance of the cathode 20 itself, thereby reducing the voltage drop on the cathode 20 to improve the display uniformity. When the first electrode part 121 and the second electrode part 122 are insulated, the first electrode part 121 is electrically connected with the cathode 20 through the cathode wire 110, so that the equivalent resistance of the cathode 20 and the first electrode part 121 as a whole is lower than the resistance of the cathode 20 itself, which can also reduce the voltage drop on the cathode 20 to improve the display uniformity.

[0043] Further, in an embodiment, the setting area of the second electrode part 122 can cover the second display area AA2. In the embodiment of the present application, Figure 2 The auxiliary electrode 120 (i.e. the first electrode part 121) in the first display area AA1 and the auxiliary electrode 120 (i.e. the second electrode part 122) in the second display area AA2 are electrically connected, and the first electrode part 121 is a full-area electrode covering the first display area AA1, and the second electrode part 122 is a full-area electrode covering the second display area AA2. In another embodiment, the second electrode part 122 can be a planar electrode part with a hollow area. Figure 4 The first electrode part 121 comprises a plurality of strip-shaped electrode parts arranged in an array, and the second electrode part 122 is a planar electrode part with a hollow area, and the first electrode part 121 and the second electrode part 122 are insulated.

[0044] In combination Figure 4and Figure 5 Optionally, the second electrode portion 122 is a planar electrode with hollowed regions 1220, at least one of the hollowed regions 1220 is a via hole 1221, and the anode 160 is connected to the source 143 or the drain 144 of the thin film transistor 140 through the via hole 1221. Some of the hollowed regions 1220 in the second electrode portion 122 can be via holes 1221, or all of the hollowed regions 1220 can be via holes 1221. Exemplarily, the anode 160, the light-emitting layer 170, and the cathode 20 constitute a plurality of sub-pixel units PX, i.e., light-emitting devices, in the display panel, and the number of the anodes 160 can be multiple, each of the sub-pixel units PX corresponds to one anode 160. In the case where the auxiliary electrode 120 is located between the anode 160 and the thin film transistor 140, a plurality of via holes 1221 can be formed in the second electrode portion 122, and the via holes 1221 are arranged one-to-one corresponding to the sub-pixel units PX, so that the source 143 or the drain 144 of the thin film transistor 140 in the pixel circuit can be connected to the anode 160 of the corresponding sub-pixel unit PX through the via hole 1221. The advantage of such an arrangement is that the pressure drop on the cathode 20 can be reduced through the second electrode portion 122, and the connection between the anode 160 and the thin film transistor 140 will not be affected.

[0045] Figure 6 is Figure 4 A cross-sectional structure schematic diagram of the display panel in Figure 4 and Figure 6 Optionally, the vertical projection of the first electrode portion 121 on the array substrate 10 overlaps with the vertical projection of the anode 160 and / or the gate 142 of the thin film transistor 140 on the array substrate 10.

[0046] Specifically, when the first electrode portion 121 is located at any metal layer between the anode 160 and the gate 142 of the thin film transistor 140, for example, the first electrode portion 121 is located at the fourth metal layer M4, by arranging the vertical projection of the first electrode portion 121 on the array substrate 10 to overlap with the vertical projection of the anode 160 and / or the gate 142 of the thin film transistor 140 on the array substrate 10, so that in the direction perpendicular to the display panel, the arrangement region of the first electrode portion 121 overlaps with the arrangement region of at least one of the anode 160 and the gate 142 of the thin film transistor 140, which helps to shield the influence of the signal on the anode 160 on the gate 142 of the thin film transistor 140 through the first electrode portion 121, so as to avoid the signal on the anode 160 from being coupled to the gate potential of the thin film transistor 140 to affect the conduction state of the thin film transistor 140, thereby avoiding affecting the display effect.

[0047] Further, in an embodiment, the first electrode portion 121 can include at least one sub-electrode portion 1211, the sub-electrode portion 1211 is insulated from the second electrode portion 122, and a vertical projection of the at least part of the sub-electrode portion 1211 on the array substrate 10 overlaps with a vertical projection of the anode 160 and / or the gate of the thin film transistor 140 on the array substrate 10. Exemplarily, the sub-electrode portion 1211 is a strip-shaped electrode portion, and in the case that the first electrode portion 121 includes a plurality of sub-electrode portions 1211, the plurality of sub-electrode portions 1211 can be arranged in an array. Adjacent sub-electrode portions 1211 can also be arranged in an insulated manner, and the sub-electrode portions 1211 can be arranged correspondingly to the anodes 160, and a vertical projection of each sub-electrode portion 1211 on the array substrate 10 can overlap with a vertical projection of the corresponding anode 160 on the array substrate 10, or overlap with a vertical projection of the gate of the thin film transistor 140 near the corresponding anode 160 on the array substrate 10, or overlap with vertical projections of the corresponding anode 160 and the gate of the thin film transistor 140 near the corresponding anode 160 on the array substrate 10, so as to shield the signal on the corresponding anode 160 from affecting the gate 142 of the thin film transistor 140 through the sub-electrode portion 1211.

[0048] It should be noted that, Figure 4 Only the case that the first electrode portion 121 includes a plurality of sub-electrode portions 1211 arranged in an insulated manner is shown, and in other embodiments, the first electrode portion 121 can also be one electrode portion, and a vertical projection of the first electrode portion 121 on the array substrate 10 overlaps with a vertical projection of the anode 160 and / or the gate 142 of the thin film transistor 140 in the second display area AA2 on the array substrate 10.

[0049] On the basis of the above-mentioned embodiments, optionally, the number of the auxiliary electrode 120 is at least one; when the number of the auxiliary electrode 120 is greater than or equal to two, each auxiliary electrode 120 is arranged in a stacked manner in the array substrate 10. Figure 3 and Figure 5 Both show the case that the number of the auxiliary electrode 120 is one, and when the number of the auxiliary electrode 120 is greater than or equal to two, each auxiliary electrode 120 can be arranged in a stacked manner between the anode 160 and the thin film transistor 140. Exemplarily, when the number of the auxiliary electrode 120 is two, one auxiliary electrode 120 can be arranged in the fourth metal layer M4 (such as Figure 5In the case where the number of auxiliary electrodes 120 is greater than or equal to two, each auxiliary electrode 120 is electrically connected to the cathode 20 through the cathode trace 110, so that the equivalent resistance of the cathode 20 and the auxiliary electrodes 120 as a whole is lower than the resistance of the cathode 20 itself, thereby further reducing the voltage drop on the cathode 20.

[0050] In combination with the above embodiments, optionally, the non-display area NAA includes a first non-display area and a second non-display area located on both sides of the display area, the cathode trace 110 includes a first trace portion 111 and a second trace portion 112, the first trace portion 111 is located in the first non-display area, and the second trace portion 112 is located in the second non-display area, the first trace portion 111 and the second trace portion 112 are both overlapped with the cathode 20, one side of the auxiliary electrode 120 is overlapped with the first trace portion 111, and the other side of the auxiliary electrode 120 is overlapped with the second trace portion 112. Figure 4 Figure 5 In combination with the above embodiments, optionally, the non-display area NAA includes a first non-display area and a second non-display area located on both sides of the display area, the cathode trace 110 includes a first trace portion 111 and a second trace portion 112, the first trace portion 111 is located in the first non-display area, and the second trace portion 112 is located in the second non-display area, the first trace portion 111 and the second trace portion 112 are both overlapped with the cathode 20, one side of the auxiliary electrode 120 is overlapped with the first trace portion 111, and the other side of the auxiliary electrode 120 is overlapped with the second trace portion 112.

[0051] Specifically, the first trace portion 111 and the second trace portion 112 are oppositely arranged on both sides of the display area, the first trace portion 111 and the second trace portion 112 are overlapped with the cathode 20 on the side of the cathode 20 close to the array substrate, one side of the second electrode portion 122 of the auxiliary electrode 120 can be overlapped with the first trace portion 111, and the other side of the second electrode portion 122 is overlapped with the second trace portion 112, so that one side of the second electrode portion 122 is electrically connected to one side of the cathode 20 through the first trace portion 111, and the other side of the second electrode portion 122 is electrically connected to the other side of the cathode 20 through the second trace portion 112, which is equivalent to connecting the second electrode portion 122 in parallel on the cathode 20, i.e. connecting a resistor in parallel on the cathode 20, so that the equivalent resistance of the cathode 20 and the auxiliary electrodes 120 as a whole is lower than the resistance of the cathode 20 itself and lower than the resistance of the auxiliary electrodes 120 themselves, thereby reducing the voltage drop on the cathode 20, reducing the signal difference of different regions of the cathode 20, and further reducing the driving current difference of different regions of the display area, which helps to improve the display uniformity.

[0052] Further, the cathode trace 110 is arranged in the same layer as any one of the plate of the capacitor 150, the source electrode 143, the drain electrode 144, and the gate electrode 142 of the thin film transistor 140 in the array substrate 10, and the auxiliary electrode 120. That is, the first trace portion 111 and the second trace portion 112 can be arranged in any one of the first metal layer M1, the second metal layer M2, and the third metal layer M3, or arranged in the same layer as the auxiliary electrode 120.

[0053] It should be noted that, Figures 2 to 5 ​Only the case that the auxiliary electrode 120 is arranged in the first display area AA1 and the second display area AA2 is shown, and in other embodiments, the auxiliary electrode 120 can also extend into the non-display area NAA, when the auxiliary electrode 120 extends into the non-display area NAA, the auxiliary electrode 120 can be electrically connected with the cathode wire 110 in the non-display area NAA.

[0054] The embodiment of the present application also provides a manufacturing method of the display panel, which is used for manufacturing the display panel in any of the above embodiments. The manufacturing method of the display panel provided by the embodiment of the present application will be described below in combination with Figure 4 and Figure 5 The manufacturing method of the display panel provided by the embodiment of the present application will be described below in combination with

[0055] The base 130 is provided, and the base 130 can be divided into a display area and a non-display area NAA, the display area includes a first display area AA1 and a second display area AA2, the light transmittance of the first display area AA1 is greater than that of the second display area AA2; a semiconductor layer 141 of a thin film transistor 140 is formed on one side of the base 130; a gate dielectric layer 181 covering the semiconductor layer 141 is formed on the side of the semiconductor layer 141 away from the base 130; a first metal layer M1 including a gate 142 of the thin film transistor 140 and a first plate 151 of a storage capacitor 150 is formed on the side of the gate dielectric layer 181 away from the base 130; a capacitor dielectric layer 182 covering the first metal layer M1 is formed on the side of the first metal layer M1 away from the base 130; a second metal layer M2 including a second plate 152 of the storage capacitor 150 is formed on the side of the capacitor dielectric layer 182 away from the base 130; an interlayer dielectric layer 183 covering the second metal layer M2 is formed on the side of the second metal layer M2 away from the base 130; a third metal layer M3 including a source 143 and a drain 144 of the thin film transistor 140 is formed on the side of the interlayer dielectric layer 183 away from the base 130, optionally, a cathode wire 110 is arranged in the third metal layer M3, and the cathode wire 110 is located in the non-display area NAA; a passivation layer 184 covering the third metal layer M3 is formed on the side of the third metal layer M3 away from the base 130; an auxiliary electrode 120 is formed on the side of the passivation layer 184 away from the base 130, the auxiliary electrode 120 is arranged at least in the first display area AA1 and the second display area AA2, the auxiliary electrode 120 is connected with the cathode wire 110, and the auxiliary electrode 120 in the first display area AA1 is made of a light-transmitting conductive material; a planarization layer 185 is formed on the side of the auxiliary electrode 120 away from the base 130, optionally, another auxiliary electrode 120 is formed on the side of the planarization layer 185 away from the base 130, and an insulating layer 186 is sequentially formed on the side of the auxiliary electrode 120 away from the base 130. Figure 5The layer auxiliary electrode 120 and the insulating layer) and the anode 160, the passivation layer 184, the auxiliary electrode 120, the planarization layer 185 and the insulating layer can be reserved with a via hole 1221, so that the anode 160 is connected to the source electrode 143 or the drain electrode 144 of the thin film transistor 140 through the via hole 1221; the pixel definition layer 186 and the support column (not shown in the figure) are formed on the side of the anode 160 away from the substrate 130, so as to obtain an array substrate; the light-emitting layer 170 is formed on the side of the pixel definition layer 186 of the array substrate; finally, the cathode 20 is formed on the side of the light-emitting layer 170 away from the array substrate, and the cathode 20 is arranged in the display area and the non-display area NAA and is electrically connected with the cathode wire 110.

[0056] The display device can be a mobile phone, or can be any electronic product with a display function, including but not limited to the following categories: television, notebook computer, desktop display, tablet computer, digital camera, smart bracelet, smart glasses, vehicle-mounted display, medical equipment, industrial control equipment, touch interaction terminal, etc., and the embodiments of the present application do not make special limitations on this.

[0057] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, and the present application does not limit this.

[0058] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that, include: An array substrate has a display area and a non-display area, wherein the display area includes a first display area and a second display area, and the light transmittance of the first display area is greater than that of the second display area; The cathode is located on one side of the array substrate and is disposed in the display area and the non-display area; The array substrate includes a cathode trace and an auxiliary electrode. The cathode trace is located in the non-display area and is connected to the cathode. The auxiliary electrode is disposed in at least the first display area and the second display area and is connected to the cathode trace. The auxiliary electrode in the first display area is made of a light-transmitting conductive material. The array substrate further includes an anode and a thin-film transistor; the auxiliary electrode is located between the anode and the thin-film transistor; The auxiliary electrode includes a first electrode portion and a second electrode portion, wherein the first electrode portion is located in the first display area and the second electrode portion is located in the second display area; The vertical projection of the first electrode portion on the array substrate overlaps with the vertical projection of the anode and / or the gate of the thin-film transistor on the array substrate.

2. The display panel according to claim 1, characterized in that, The thin-film transistor includes multiple metal layers, wherein the metal layer furthest from the anode is the first metal layer, and the auxiliary electrode is disposed in the same layer as at least one of the first metal layer and the metal layer between the first metal layer and the anode.

3. The display panel according to claim 2, characterized in that, The second electrode portion overlaps with the cathode trace, and the first electrode portion is made of a light-transmitting conductive material.

4. The display panel according to claim 3, characterized in that, The area where the second electrode is disposed covers the second display area, or the second electrode is a planar electrode with a hollowed-out area.

5. The display panel according to claim 3, characterized in that, The second electrode portion is made of the same material as the first electrode portion.

6. The display panel according to claim 4, characterized in that, The second electrode is a planar electrode with a hollowed-out area, at least one of the hollowed-out areas being a via, and the anode is connected to the source / drain of the thin-film transistor through the via.

7. The display panel according to claim 1, characterized in that, The first electrode portion includes at least one sub-electrode portion, which is insulated from the second electrode portion, and at least a portion of the vertical projection of the sub-electrode portion on the array substrate overlaps with the vertical projection of the anode and / or the gate of the thin-film transistor on the array substrate.

8. The display panel according to any one of claims 1-7, characterized in that, The number of auxiliary electrodes is at least one; when the number of auxiliary electrodes is greater than or equal to two, each of the auxiliary electrodes is stacked in the array substrate.

9. The display panel according to any one of claims 1-7, characterized in that, The non-display area includes a first non-display area and a second non-display area located on both sides of the display area. The cathode trace includes a first trace portion and a second trace portion. The first trace portion is located in the first non-display area, and the second trace portion is located in the second non-display area. Both the first trace portion and the second trace portion are connected to the cathode. One side of the auxiliary electrode is connected to the first trace portion, and the other side of the auxiliary electrode is connected to the second trace portion.

10. The display panel according to any one of claims 1-7, characterized in that, The array substrate also includes a capacitor, and the cathode trace is disposed on the same layer as any one of the capacitor plate, the source / drain electrode and gate of the thin film transistor in the array substrate, and the auxiliary electrode.

11. A display device, characterized in that, Includes the display panel described in any one of claims 1-10.

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