Display panel and display device

Abstract

Embodiments of the present application disclose a display panel and a display device. The display panel comprises a substrate, a first insulating layer, a first auxiliary electrode, a second insulating layer, a light-emitting layer and a cathode layer arranged in sequence, a pixel opening is formed in the first insulating layer, the first auxiliary electrode has a first side wall facing the pixel opening, a first through hole is formed in the second insulating layer and communicates with the pixel opening, the second insulating layer has a protruding portion protruding from the first side wall, a gap is formed between the protruding portion and the first insulating layer, the light-emitting layer and the cathode layer are arranged in the pixel opening, and the cathode layer is electrically connected with the first side wall. By arranging the first auxiliary electrode on the first insulating layer and forming the protruding portion near the edge of the pixel opening to form an undercut structure, the resistance drop in the display panel is reduced, and the undercut structure is prevented from occupying additional space, so that the display panel has a high aperture ratio.

Description

TECHNICAL FIELD

[0001] The present application relates to the display field, and in particular to a display panel and a display device. BACKGROUND

[0002] An organic light emitting diode (OLED) device has the characteristics of self-emission, wide viewing angle, high contrast, fast response speed, thinness, etc., and in particular, a large-size OLED device has become a main trend of display technology. The OLED display panel structure includes a transparent anode layer, a light emitting layer and a metal cathode layer. In order to increase the transmittance of top emission, the thickness of the metal cathode is relatively thin, which causes a large sheet resistance and a serious current voltage drop, resulting in a significant brightness non-uniformity of the display panel, which seriously affects the display effect of the OLED display device. In order to improve the brightness non-uniformity of the display panel, an auxiliary electrode is usually erected and connected to the thin metal cathode layer. Since the resistance of the auxiliary electrode is small, the impedance of the cathode of the display panel and the current voltage drop can be reduced when the auxiliary electrode is powered on, so that the brightness uniformity is improved to a certain extent.

[0003] At present, in order to realize the lapping of the auxiliary electrode and the metal cathode, a reverse trapezoidal isolation column is usually arranged between the cathode and the auxiliary electrode. However, the isolation column has a large volume ratio, which will cause the aperture ratio of the display panel to decrease and affect the display quality of the display panel. SUMMARY

[0004] The embodiments of the present application provide a display panel and a display device, which can solve the problem that the aperture ratio decreases when the auxiliary electrode and the cathode layer are lapped in the existing display panel.

[0005] The embodiments of the present application provide a display panel, comprising:

[0006] a substrate;

[0007] a first insulating layer arranged on the substrate, and a pixel opening being formed in the first insulating layer;

[0008] a first auxiliary electrode arranged on a side of the first insulating layer away from the substrate, the first auxiliary electrode having a first side wall facing the pixel opening, and a projection of the first side wall on the substrate being located outside a projection of the pixel opening on the substrate;

[0009] a second insulating layer arranged on a side of the first auxiliary electrode away from the first insulating layer, the second insulating layer having a first through hole formed therein, the first through hole being in communication with the pixel opening, and the second insulating layer having a protruding portion protruding from the first side wall, and a gap being formed between the protruding portion and the first insulating layer;

[0010] a light emitting layer arranged in the pixel opening;

[0011] a cathode layer covering the light-emitting layer and electrically connected with the first sidewall.

[0012] Optionally, in some embodiments of the present application, the first via hole has a second sidewall, a projection of the second sidewall on the first insulating layer is at least partially located outside the pixel opening.

[0013] Optionally, in some embodiments of the present application, a projection of the first sidewall on the substrate is annular, the first sidewall encloses a second via hole, and the second via hole is in communication with the first via hole and the pixel opening.

[0014] Optionally, in some embodiments of the present application, a projection of the first via hole on the substrate is located within a projection of the second via hole on the substrate.

[0015] Optionally, in some embodiments of the present application, a projection of the protruding portion on the first insulating layer is annular, and the projection of the protruding portion on the first insulating layer is located outside the pixel opening.

[0016] Optionally, in some embodiments of the present application, the display panel further comprises an anode layer between the substrate and the first insulating layer, the anode layer comprises an anode and a second auxiliary electrode arranged at intervals, and the pixel opening exposes part of the anode; a third via hole is formed on the first insulating layer at a position corresponding to the second auxiliary electrode, and the first auxiliary electrode is electrically connected with the second auxiliary electrode through the third via hole.

[0017] Optionally, in some embodiments of the present application, a third auxiliary electrode is arranged in the substrate, a fourth via hole is formed on the substrate, and the second auxiliary electrode is electrically connected with the third auxiliary electrode through the fourth via hole.

[0018] Optionally, in some embodiments of the present application, a third auxiliary electrode is arranged in the substrate, a fourth via hole is formed on the substrate, and the first auxiliary electrode is electrically connected with the third auxiliary electrode through the fourth via hole.

[0019] Optionally, in some embodiments of the present application, the first via hole has a second sidewall, the pixel opening has a third sidewall, in the light-emitting direction of the display panel, cross-sectional areas of the first via hole and the pixel opening gradually increase, the second sidewall forms a first obtuse angle with the substrate, the third sidewall forms a second obtuse angle with the substrate, and the first obtuse angle is greater than or equal to the second obtuse angle.

[0020] Correspondingly, the embodiments of the present application also provide a display device comprising the display panel as described in any one of the above.

[0021] The display panel provided in the embodiments of the present application comprises, in sequence, a substrate, a first insulating layer, a first auxiliary electrode, a second insulating layer, a light-emitting layer, and a cathode layer, the first insulating layer is provided with a pixel opening, the first auxiliary electrode has a first sidewall facing the pixel opening, the orthographic projection of the first sidewall on the substrate is located outside the orthographic projection of the pixel opening on the substrate, the second insulating layer is provided with a first through hole in communication with the pixel opening, the second insulating layer has a protruding portion protruding from the first sidewall, a gap is formed between the protruding portion and the first insulating layer, the light-emitting layer is arranged in the pixel opening, and the cathode layer covers the light-emitting layer and is electrically connected with the first sidewall. By arranging the first auxiliary electrode on the first insulating layer and forming the protruding portion at a position close to the edge of the pixel opening on the first insulating layer, the undercut structure is directly formed between the protruding portion and the first auxiliary electrode, so that the cathode layer is disconnected at the protruding position of the protruding portion, and the cathode layer is electrically connected with the first auxiliary electrode. This arrangement can reduce the internal resistance pressure drop of the display panel, and can avoid the undercut structure from occupying additional space, thereby ensuring that the display panel has a high aperture ratio. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0023] Figure 1 is a structural schematic diagram of a display panel provided by the embodiments of the present application;

[0024] Figure 2 is a structural schematic diagram of a display device provided by the embodiments of the present application;

[0025] Figure 3 is a flowchart of a manufacturing method of a display panel provided by the embodiments of the present application;

[0026] Figure 4 is a structural schematic diagram of a display panel provided by the embodiments of the present application; Figure 3 is a flowchart between step S100 and step S200 in the method;

[0027] Figure 5 is a structural schematic diagram of step S200 in the method; Figure 3

[0028] Figure 6 is a flowchart of steps S300 to S500 in the method; Figure 3

[0029] Figure 7 ​​A display panel is provided in the embodiments of the present application Figure 3 A structural schematic diagram of step S600.

[0030] Label explanation:

[0031] 10, display device; 100, display panel; 110, substrate; 111, third auxiliary electrode; 112, fourth via hole; 120, planarization layer; 130, anode layer; 131, anode; 132, second auxiliary electrode; 140, first insulating layer; 141, pixel opening; 142, third sidewall; 143, third via hole; 150, first auxiliary electrode; 151, first sidewall; 152, second via hole; 160, second insulating layer; 161, first via hole; 162, second sidewall; 163, protruding part; 170, light-emitting layer; 180, cathode layer; 200, control circuit; 300, shell; 20, photoresist layer. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the drawing plane direction in the drawings; and "inner" and "outer" refer to the contour of the device.

[0033] The present application provides a display panel, which is described in detail below. It should be noted that the description order of the following embodiments is not limited as the preferred order of the embodiments.

[0034] First, the present application provides a display panel, as shown in Figure 1 The display panel 100 includes a substrate 110, which is used as the base structure of the display panel 100 to support the subsequent functional structure layer. The substrate 110 includes a substrate layer and a thin film transistor layer arranged in sequence, and the thin film transistor layer includes a plurality of thin film transistors. The on and off of the thin film transistors can control the on and off of the corresponding input signals, thereby regulating the display mode of the display panel 100.

[0035] The display panel 100 comprises a first insulating layer 140 disposed on the substrate 110, and a pixel opening 141 is formed in the first insulating layer 140, which is used to define the position of the light-emitting pixel area, that is, the first insulating layer 140 in the embodiment is a pixel definition layer.

[0036] The material of the first insulating layer 140 can be inorganic material such as SiO or SiN, and the thickness thereof can be greater than or equal to 0.4 μm and less than or equal to 1.0 μm. If the thickness of the first insulating layer 140 is too small, the depth of the pixel opening 141 will be shallow, which is not conducive to the subsequent manufacturing of the light-emitting layer 170. If the thickness of the first insulating layer 140 is too large, the overall thickness of the display panel 100 will be too large, which is not conducive to the lightweight design of the display panel 100. Specifically, the thickness of the first insulating layer 140 can be set to 0.4 μm, 0.6 μm, 0.8 μm or 1.0 μm, and the specific value can be selected and adjusted according to the actual design requirements, which is not specially limited here.

[0037] The display panel 100 comprises a first auxiliary electrode 150 disposed on the side of the first insulating layer 140 away from the substrate 110, wherein the first auxiliary electrode 150 has a first side wall 151 facing the pixel opening 141, and the orthographic projection of the first side wall 151 on the substrate 110 is located outside the orthographic projection of the pixel opening 141 on the substrate 110, that is, in the thickness direction of the display panel 100, the first side wall 151 of the first auxiliary electrode 150 is located outside the pixel opening 141, so as to avoid shielding the pixel opening 141, thereby avoiding interference with the subsequent manufacturing of the light-emitting layer 170 and the cathode layer 180, and further affecting the normal display of the display panel 100.

[0038] It should be noted that the material of the first auxiliary electrode 150 can be metal or metal alloy material such as aluminum, molybdenum, silver or copper, and the first auxiliary electrode 150 can be single-layer or multi-layer structure, and the thickness thereof can be greater than or equal to 0.5 μm and less than or equal to 2.0 μm. If the thickness of the first auxiliary electrode 150 is too small, the internal resistance of the first auxiliary electrode 150 will be too large, which is not conducive to the improvement of the internal resistance voltage drop of the display panel 100. If the thickness of the first auxiliary electrode 150 is too large, the overall thickness of the display panel 100 will be too large, which is not conducive to the lightweight design of the display panel 100, and is also not conducive to the patterning of the first auxiliary electrode 150. Specifically, the thickness of the first auxiliary electrode 150 can be set to 0.5 μm, 1.0 μm, 1.5 μm or 2.0 μm, and the specific value can be selected and adjusted according to the actual design requirements, which is not specially limited here.

[0039] The display panel 100 comprises a second insulating layer 160, which is arranged on the side of the first auxiliary electrode 150 away from the first insulating layer 140, and a first through hole 161 is formed in the second insulating layer 160 and communicates with the pixel opening 141. The second insulating layer 160 has a protruding portion 163 protruding from the first side wall 151, and a gap is formed between the protruding portion 163 and the first insulating layer 140, that is, the second insulating layer 160 and the first auxiliary electrode 150 form an undercut structure at the edge of the pixel opening 141. Compared with the conventional manufacturing method of forming an undercut structure by arranging a separation column, the undercut structure can effectively avoid additional space ratio, thereby ensuring that the display panel 100 has a higher aperture ratio.

[0040] The material of the second insulating layer 160 can be inorganic materials such as SiO or SiN, or organic materials, and the specific material is not limited. The thickness of the second insulating layer 160 can be greater than or equal to 0.35 μm and less than or equal to 2.0 μm. If the thickness of the second insulating layer 160 is too small, it cannot effectively isolate the second auxiliary electrode 132. If the thickness of the second insulating layer 160 is too large, it will cause the overall thickness of the display panel 100 to be too large, which is not conducive to the lightweight design of the display panel 100. Specifically, the thickness of the second insulating layer 160 can be 0.35 μm, 0.5 μm, 1.0 μm, 1.5 μm or 2.0 μm, and the specific value can be selected and adjusted according to the actual design requirements, which is not specially limited here.

[0041] The display panel 100 further comprises a light-emitting layer 170 and a cathode layer 180. The light-emitting layer 170 is arranged in the pixel opening 141, and the cathode layer 180 covers the light-emitting layer 170 and is electrically connected with the first side wall 151 of the first auxiliary electrode 150, so as to reduce the internal resistance voltage drop generated in the display panel 100 and improve the display quality of the display panel 100.

[0042] The display panel 100 in the embodiment of the present application comprises a substrate 110, a first insulating layer 140, a first auxiliary electrode 150, a second insulating layer 160, a light-emitting layer 170 and a cathode layer 180 arranged in sequence, the first insulating layer 140 is provided with a pixel opening 141, the first auxiliary electrode 150 has a first sidewall 151 facing the pixel opening 141, the orthographic projection of the first sidewall 151 on the substrate 110 is located outside the orthographic projection of the pixel opening 141 on the substrate 110, the second insulating layer 160 is provided with a first through hole 161 communicating with the pixel opening 141, the second insulating layer 160 has a protruding portion 163 protruding from the first sidewall 151, and a gap is formed between the protruding portion 163 and the first insulating layer 140, the light-emitting layer 170 is arranged in the pixel opening 141, and the cathode layer 180 covers the light-emitting layer 170 and is electrically connected with the first sidewall 151. By arranging the first auxiliary electrode 150 on the first insulating layer 140 and forming the protruding portion 163 on the first insulating layer 140 near the edge of the pixel opening 141, the undercut structure is formed between the protruding portion 163 and the first auxiliary electrode 150, so that the cathode layer 180 is disconnected at the protruding position of the protruding portion 163, and the cathode layer 180 is electrically connected with the first auxiliary electrode 150. This arrangement can reduce the internal resistance drop of the display panel 100 while avoiding the undercut structure from occupying additional space, thereby ensuring that the display panel 100 has a high aperture ratio.

[0043] Optionally, the first through hole 161 has a second sidewall 162, and the orthographic projection of the second sidewall 162 on the first insulating layer 140 is at least partially located outside the pixel opening 141, that is, when the second insulating layer 160 is only partially protruding from the first sidewall 151 to form the protruding portion 163, the second sidewall 162 includes a portion corresponding to the protruding portion 163 and other portions, the orthographic projection of the other portions on the first insulating layer 140 is located outside the pixel opening 141, and the orthographic projection of the portion corresponding to the protruding portion 163 on the first insulating layer 140 can be located outside or inside the pixel opening 141. This is because when the display panel 100 performs light-emitting display, the emitted light will pass through the pixel opening 141 and the first through hole 161 in sequence, and this arrangement can minimize the interference of the second sidewall 162 of the first through hole 161 with the emitted light, thereby reducing the influence of the second sidewall 162 on the aperture ratio of the display panel 100.

[0044] In some embodiments, the first sidewall 151 has a ring-shaped orthographic projection on the substrate 110, and the first sidewall 151 encloses the second through hole 152 which is in communication with the first through hole 161 and the pixel opening 141. That is, the first auxiliary electrode 150 is arranged around the pixel opening 141, which can increase the area of the second sidewall 162, thereby increasing the effective contact area between the cathode layer 180 and the first auxiliary electrode 150, improving the lapping stability of the cathode layer 180 and the first auxiliary electrode 150, reducing the internal resistance pressure drop of the display panel 100, and improving the display quality of the display panel 100.

[0045] The orthographic projection of the first through hole 161 on the substrate 110 is located within the orthographic projection of the second through hole 152 on the substrate 110, that is, the orthographic projection of the second through hole 152 on the substrate 110 covers the orthographic projection of the first through hole 161 on the substrate 110. When the second insulating layer 160 only partially protrudes from the first sidewall 151 to form the protruding portion 163, the second sidewall 162 of the first through hole 161 includes a portion corresponding to the protruding portion 163 and other portions. At this time, the orthographic projection of the portion of the second sidewall 162 corresponding to the protruding portion 163 on the substrate 110 is located within the orthographic projection of the second through hole 152 on the substrate 110, and the orthographic projection of the other portions of the second sidewall 162 on the substrate 110 can be flush with the edge of the orthographic projection of the second through hole 152 on the substrate 110, that is, the other portions of the second sidewall 162 can be flush with the corresponding first sidewall 151, and form a continuous sidewall.

[0046] When the orthographic projection of the protruding portion 163 on the first insulating layer 140 is a ring shape, that is, the first auxiliary electrode 150 is arranged around the pixel opening 141, and the protruding portion 163 is also arranged around the pixel opening 141, the second sidewall 162 of the first through hole 161 is the sidewall corresponding to the protruding portion 163, thereby forming a ring-shaped undercut structure around the pixel opening 141. Correspondingly, the cathode layer 180 is also disconnected at the protruding portion 163, so that the cathode layer 180 in the light-emitting pixel area is completely disconnected from the cathode layer 180 in other areas. This structure design allows the control signal to be directly transmitted to the cathode layer 180 in the pixel light-emitting area through the first auxiliary electrode 150 when the control signal is input to the first auxiliary electrode 150, without passing through the cathode layer 180 in other areas, thereby further reducing the internal resistance pressure drop generated in the display panel 100, and improving the display quality of the display panel 100.

[0047] The convex portion 163 is projected on the first insulating layer 140 outside the pixel opening 141, that is, the cross-sectional area of the first through hole 161 is larger than the cross-sectional area of the pixel opening 141, and the projection of the first through hole 161 on the substrate 110 covers the projection of the pixel opening 141 on the substrate 110. Such a structure design can further reduce the interference of the second side wall 162 of the first through hole 161 on the light emitted by the display panel 100, and further reduce the influence of the second side wall 162 on the aperture ratio of the display panel 100.

[0048] Optionally, the display panel 100 further comprises an anode layer 130, the anode layer 130 is located between the substrate 110 and the first insulating layer 140, and the anode layer 130 comprises a plurality of anodes 131 and a second auxiliary electrode 132 arranged at intervals, that is, the second auxiliary electrode 132 is arranged in the same layer as the anode 131, so as to simplify the manufacturing process of the display panel 100. The pixel opening 141 on the first insulating layer 140 exposes part of the anode 131, and the light-emitting layer 170 covers the exposed anode 131. Through the joint control of the anode 131 and the cathode layer 180, the display mode of the display panel 100 can be realized.

[0049] The third through hole 143 is arranged on the first insulating layer 140 corresponding to the position of the second auxiliary electrode 132, and the first auxiliary electrode 150 is electrically connected to the second auxiliary electrode 132 through the third through hole 143, that is, the cathode layer 180 and the first auxiliary electrode 150 are connected in parallel, and the first auxiliary electrode 150 is connected in parallel with the second auxiliary electrode 132, so as to further reduce the internal resistance voltage drop generated by the display panel 100 and improve the display quality of the display panel 100.

[0050] In some embodiments, the third auxiliary electrode 111 is arranged in the substrate 110, and the fourth through hole 112 is arranged on the substrate 110, and the second auxiliary electrode 132 is electrically connected to the third auxiliary electrode 111 through the fourth through hole 112, that is, after the first auxiliary electrode 150 is electrically connected to the second auxiliary electrode 132, the first auxiliary electrode 150 is further electrically connected to the third auxiliary electrode 111, so as to further reduce the internal resistance voltage drop generated by the display panel 100 and improve the display quality of the display panel 100. At the same time, since the driving circuit trace is arranged in the substrate 110, the third auxiliary electrode 111 is arranged in the substrate 110, so that the input signal can be transmitted to the cathode layer 180 through the third auxiliary electrode 111 in sequence, thereby facilitating the signal input design of the cathode layer 180.

[0051] In some embodiments, the substrate 110 is provided with a third auxiliary electrode 111, and the substrate 110 is provided with a fourth through hole 112, and the first auxiliary electrode 150 is electrically connected to the third auxiliary electrode 111 through the fourth through hole 112, that is, the first auxiliary electrode 150 is directly electrically connected to the third auxiliary electrode 111. The material of the first auxiliary electrode 150 is the same as that of the third auxiliary electrode 111, and the direct electrical connection between the first auxiliary electrode 150 and the third auxiliary electrode 111 can reduce the contact resistance between the first auxiliary electrode 150 and the third auxiliary electrode 111, thereby reducing the internal resistance voltage drop of the display panel 100 and improving the display quality of the display panel 100.

[0052] It should be noted that the substrate 110 includes a substrate layer and a thin film transistor layer arranged in sequence, and the thin film transistor layer includes multiple metal layers to form a gate, a source, a drain, a scan line, a data line and the like. The third auxiliary electrode 111 in the embodiment of the present application can be arranged in the same layer as any one of the metal layers in the thin film transistor layer to simplify the manufacturing process of the display panel 100. Alternatively, the third auxiliary electrode 111 can also be separately formed as a film layer in the substrate 110, and the specific arrangement manner can be selected according to actual design requirements, which is not specially limited here.

[0053] Optionally, the first through hole 161 has a second side wall 162, and the pixel opening 141 has a third side wall 142. In the light-emitting direction of the display panel 100, the cross-sectional area of the first through hole 161 and the cross-sectional area of the pixel opening 141 gradually increase, that is, the first through hole 161 and the pixel opening 141 both have a trend of expansion in the light-emitting direction of the display panel 100, so that the display panel 100 has sufficient aperture ratio, thereby ensuring the display effect of the display panel 100.

[0054] The second side wall 162 forms a first obtuse angle with the substrate 110, and the third side wall 142 forms a second obtuse angle with the substrate 110, and the first obtuse angle is greater than or equal to the second obtuse angle, that is, the expansion trend of the first through hole 161 is greater than or equal to the expansion trend of the pixel opening 141. Since the display panel 100 emits light during display, the emitted light will pass through the pixel opening 141 and the first through hole 161 in sequence. By setting the expansion trend of the first through hole 161 to be greater than or equal to the expansion trend of the pixel opening 141, the interference of the second side wall 162 of the first through hole 161 to the emitted light can be further reduced, thereby reducing the influence of the second side wall 162 on the aperture ratio of the display panel 100, and further improving the display quality of the display panel 100.

[0055] Secondly, the display device provided by the embodiment of the present application comprises a display panel, the specific structure of which is referred to the above embodiment. Since the display device adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0056] As shown in Figure 2 The display device 10 comprises a display panel 100, a control circuit 200 and a housing 300. The housing 300 is connected with the display panel 100 to support and fix the display panel 100. The control circuit 200 is arranged in the housing 300 and is electrically connected with the display panel 100 to control the display panel 100 to display pictures.

[0057] The display panel 100 can be fixed to the housing 300 to form an integral whole with the housing 300. The display panel 100 and the housing 300 form a closed space to accommodate the control circuit 200. The control circuit 200 can be a main board of the display device 10. Meanwhile, one or more of the following functional components can be integrated on the control circuit 200, such as a battery, an antenna structure, a microphone, a loudspeaker, an earphone interface, a universal serial bus interface, a camera, a distance sensor, an ambient light sensor and a processor, so that the display device 10 can be adapted to various application fields.

[0058] Specifically, the display panel 100 comprises a substrate 110, a first insulating layer 140, a first auxiliary electrode 150, a second insulating layer 160, a light-emitting layer 170 and a cathode layer 180 arranged in sequence. The first insulating layer 140 is provided with a pixel opening 141. The first auxiliary electrode 150 has a first sidewall 151 facing the pixel opening 141. The orthographic projection of the first sidewall 151 on the substrate 110 is located outside the orthographic projection of the pixel opening 141 on the substrate 110. The second insulating layer 160 is provided with a first through hole 161 communicating with the pixel opening 141. The second insulating layer 160 has a protruding portion 163 protruding from the first sidewall 151. The protruding portion 163 and the first insulating layer 140 have a gap therebetween. The light-emitting layer 170 is arranged in the pixel opening 141. The cathode layer 180 covers the light-emitting layer 170 and is electrically connected with the first sidewall 151. In the present application, the first auxiliary electrode 150 is arranged on the first insulating layer 140, and the protruding portion 163 is formed on the first insulating layer 140 near the edge of the pixel opening 141. The protruding portion 163 and the first auxiliary electrode 150 form an undercut structure, so that the cathode layer 180 is disconnected at the protruding position of the protruding portion 163, and the cathode layer 180 is electrically connected with the first auxiliary electrode 150. This arrangement can reduce the internal resistance drop of the display panel 100 while avoiding the undercut structure from occupying additional space, thereby ensuring that the display panel 100 has a high aperture ratio and improving the overall display quality of the display device.

[0059] Finally, the application also provides a manufacturing method of the display panel, as shown in the figure Figure 3 The manufacturing method of the display panel mainly includes the following steps:

[0060] S100, providing a substrate 110.

[0061] In the manufacturing of the display panel 100, first, a substrate 110 is provided as the base structure of the display panel 100 for supporting the subsequent functional structure layer. The substrate 110 includes a substrate layer and a thin film transistor layer arranged in sequence, and the thin film transistor layer includes a plurality of thin film transistors, the on and off of which can control the on and off of the corresponding input signal, thereby regulating the display mode of the display panel 100.

[0062] S200, forming a first insulating layer 140 on the substrate 110, and processing the first insulating layer 140 to form a pixel opening 141.

[0063] As shown in the figure Figure 5 After the above steps are completed, a first insulating layer 140 is formed on the substrate 110, and the first insulating layer 140 is processed to form a pixel opening 141, which is used to define the position of the light-emitting pixel area, i.e. the first insulating layer 140 in the application is a pixel definition layer. The material of the first insulating layer 140 can be inorganic materials such as SiO or SiN, and its thickness can be set to be greater than or equal to 0.4 μm and less than or equal to 1.0 μm.

[0064] S300, sequentially forming a first auxiliary electrode 150, a second insulating layer 160 and a photoresist layer 20 on the side of the first insulating layer 140 away from the substrate 110, and patterning the photoresist layer 20 and the second insulating layer 160 to form a first through hole 161 on the second insulating layer 160 corresponding to the position of the pixel opening 141.

[0065] S400, taking the second insulating layer 160 as a mask, etching the first auxiliary electrode 150, and forming a first side wall 151 facing the pixel opening 141, so that the orthographic projection of the first side wall 151 on the substrate 110 is located outside the orthographic projection of the pixel opening 141 on the substrate 110, and the second insulating layer 160 forms a protruding portion 163 protruding from the first side wall 151, and the protruding portion 163 has a gap with the first insulating layer 140.

[0066] S500, stripping the photoresist layer 20.

[0067] As shown in the figure Figure 6As shown, after the fabrication of the first insulating layer 140 is completed, the first auxiliary electrode 150, the second insulating layer 160 and the photoresist layer 20 are sequentially formed on the side of the first insulating layer 140 away from the substrate 110, and then the photoresist layer 20 is subjected to a patterning process, and then the second insulating layer 160 is subjected to a patterning process with the patterned photoresist layer 20 as a mask to form the first through hole 161 on the second insulating layer 160 at a position corresponding to the pixel opening 141.

[0068] Then, the first auxiliary electrode 150 is etched with the second insulating layer 160 as a mask. In this embodiment, the first auxiliary electrode 150 can be side-etched by wet etching the metal to form the first side wall 151 of the first auxiliary electrode 150 facing the pixel opening 141, and the orthographic projection of the first side wall 151 on the substrate 110 is located outside the orthographic projection of the pixel opening 141 on the substrate 110, while the second insulating layer 160 forms the protruding portion 163 protruding from the first side wall 151, and the protruding portion 163 has a gap with the first insulating layer 140. That is, the second insulating layer 160 and the first auxiliary electrode 150 form an undercut structure at the edge of the pixel opening 141. Compared with the conventional fabrication method in which the undercut structure is formed by setting a spacer, the undercut structure can effectively avoid the additional space ratio, thereby ensuring that the display panel 100 has a higher aperture ratio.

[0069] It should be noted that the specific structure of the first auxiliary electrode 150 and the protruding portion 163 can refer to the related description in the above embodiments, which will not be repeated here.

[0070] S600, forming a light-emitting layer 170 in the pixel opening 141.

[0071] S700, covering the light-emitting layer 170 with a cathode layer 180, and electrically connecting the cathode layer 180 with the first side wall 151.

[0072] As Figure 7 and Figure 1As shown, after the undercut structure is formed, the light-emitting layer 170 and the cathode layer 180 are sequentially formed in the pixel opening 141, the light-emitting layer 170 covers the sidewall of the pixel opening 141, and the cathode layer 180 covers the light-emitting layer 170 and is electrically connected with the first sidewall 151 of the first auxiliary electrode 150. The light-emitting layer 170 and the cathode layer 180 are disconnected at the protruding part 163. By controlling the evaporation angle of the light-emitting layer 170 and the cathode layer 180, the light-emitting layer 170 can only cover the area of the first sidewall 151 close to the first insulating layer 140, and the cathode layer 180 further covers the first sidewall 151 based on covering the light-emitting layer 170, so as to realize the lap joint of the cathode layer 180 and the first sidewall 151 of the first auxiliary electrode 150, and further reduce the internal resistance voltage drop generated in the plane of the display panel 100 and improve the display quality of the display panel 100.

[0073] It should be noted that, as Figure 4 As shown, between the step S100 and the step S200, the fabrication of the planarization layer 120 and the anode layer 130 is further included, that is, after the substrate 110 is provided, a planarization layer 120 needs to be fabricated on the substrate 110 to perform planarization treatment on the surface of the substrate 110, so as to facilitate the fabrication of subsequent film layers. The thickness of the planarization layer 120 can be set to be greater than or equal to 1.0 μm and less than or equal to 4.0 μm. If the third auxiliary electrode 111 is arranged in the substrate 110, when the planarization layer 120 and the substrate 110 are subjected to the patterning treatment, a fourth through hole 112 for lap joint with the third auxiliary electrode 111 and an electrode contact hole for electrical connection with the thin film transistor need to be defined.

[0074] Then, an anode layer 130 is formed on the planarization layer 120, and the anode layer 130 is subjected to the patterning treatment to form an anode 131, which is electrically connected with the thin film transistor through the electrode contact hole, and the conduction and disconnection of the thin film transistor can realize the control of the conduction and disconnection of the input signal on the anode 131. When the anode layer 130 is subjected to the patterning treatment, a second auxiliary electrode 132 can be formed at the same time, which is electrically connected with the third auxiliary electrode 111 through the fourth through hole 112. Correspondingly, when the first insulating layer 140 is treated, a third through hole 143 for lap joint with the second auxiliary electrode 132 can also be defined on the first insulating layer 140, so as to facilitate the lap joint design of the first auxiliary electrode 150 and the second auxiliary electrode 132.

[0075] After the fabrication of the light-emitting layer 170 and the cathode layer 180 is completed, an encapsulation layer needs to be formed on the cathode layer 180 to encapsulate and protect the internal structure of the display panel 100, so as to avoid the invasion of moisture or oxygen in the external environment into the inside of the display panel 100 and damage the light-emitting layer 170, and further ensure the display effect and stability of the display panel 100.

[0076] The above describes in detail the display panel and the display device provided by the embodiments of the present application. The principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In summary, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate; a first insulating layer disposed on the substrate, the first insulating layer being provided with a pixel opening; a first auxiliary electrode disposed on a side of the first insulating layer away from the substrate, the first auxiliary electrode having a first side wall facing the pixel opening, a projection of the first side wall on the substrate being located outside a projection of the pixel opening on the substrate; a second insulating layer disposed on a side of the first auxiliary electrode away from the first insulating layer, the second insulating layer being provided with a first through hole, the first through hole being in communication with the pixel opening; the second insulating layer having a protruding portion protruding from the first side wall, the protruding portion and the first insulating layer having a gap therebetween; a light-emitting layer disposed in the pixel opening; a cathode layer covering the light-emitting layer and electrically connected with the first side wall; wherein the protruding portion and the first auxiliary electrode directly form an undercut structure, so that the cathode layer is disconnected at a protruding position of the protruding portion.

2. The display panel of claim 1, wherein, The first through hole has a second side wall, a projection of the second side wall on the first insulating layer being at least partially located outside the pixel opening.

3. The display panel of claim 1, wherein, A projection of the first side wall on the substrate is annular, and the first side wall encloses a second through hole, the second through hole being in communication with the first through hole and the pixel opening.

4. The display panel of claim 3, wherein, A projection of the first through hole on the substrate is located within a projection of the second through hole on the substrate.

5. The display panel of claim 3, wherein, A projection of the protruding portion on the first insulating layer is annular, and the projection of the protruding portion on the first insulating layer is located outside the pixel opening.

6. The display panel of any one of claims 1 to 5, wherein, The display panel further comprises an anode layer between the substrate and the first insulating layer, the anode layer comprising a spaced anode and a second auxiliary electrode, the pixel opening exposing part of the anode; the first insulating layer is provided with a third through hole corresponding to the position of the second auxiliary electrode, and the first auxiliary electrode is electrically connected with the second auxiliary electrode through the third through hole.

7. The display panel of claim 6, wherein, The substrate is provided with a third auxiliary electrode, and the substrate is provided with a fourth through hole, and the second auxiliary electrode is electrically connected with the third auxiliary electrode through the fourth through hole.

8. The display panel of any one of claims 1 to 5, wherein, The substrate is provided with a third auxiliary electrode, and the substrate is provided with a fourth through hole, and the first auxiliary electrode is electrically connected with the third auxiliary electrode through the fourth through hole.

9. The display panel of any one of claims 1 to 5, wherein, The first through hole has a second side wall, and the pixel opening has a third side wall, in the light-emitting direction of the display panel, the cross-sectional area of the first through hole and the cross-sectional area of the pixel opening gradually increase, the second side wall forms a first obtuse angle with the substrate, and the third side wall forms a second obtuse angle with the substrate, the first obtuse angle being greater than or equal to the second obtuse angle.

10. A display device, characterized by comprising: The display panel comprises any one of claims 1 to 9.

Images