WO2021007720A1

WO2021007720A1 - Display panel and manufacturing method

Info

Publication number: WO2021007720A1
Application number: PCT/CN2019/095853
Authority: WO
Inventors: 张祖强; 邱昌明
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2021-01-21
Also published as: CN113366652A

Abstract

The present application provides a display panel (1), comprising a substrate (10), a light emitting unit (20), and an auxiliary electrode (30). The light emitting unit (20) comprises a first electrode (21), a light emitting layer (22), and a second electrode (23); the first electrode (21) is disposed adjacent to the substrate (10) with respect to the light emitting layer (22) and the second electrode (23); the light emitting layer (22) is provided on the side of the first electrode (21) facing away from the substrate (10); the second electrode (23) is provided on the side of the light emitting layer (22) facing away from the first electrode (21); the auxiliary electrode (30) is electrically connected to the second electrode (23), and the auxiliary electrode (30) is connected in parallel with the second electrode (23). By adding the auxiliary electrode (30) in the display panel (1), the resistance of the second electrode (23) is reduced, so that the problem of voltage drop is alleviated and the visual effect during viewing of users is improved. The present application further provides a method for manufacturing the display panel (1).

Description

Display panel and preparation method

Technical field

This application belongs to the technical field of display panels, and specifically relates to display panels and manufacturing methods.

Background technique

At present, electronic devices are very popular among consumers due to their low energy consumption, high brightness, fast response time, wide viewing angle, and light weight. Among them, one of the core components of the electronic device is an organic light-emitting diode display (Organic Light-Emitting Diode, OLED) panel. The organic light-emitting diode display panel is driven by current, so a voltage drop (IR Drop) is generated in the organic light-emitting diode display panel, which causes uneven brightness of the organic light-emitting diode display panel, which seriously affects the visual effect of users. .

Application content

In view of this, the present application provides a display panel and a manufacturing method, by adding an auxiliary electrode in the display panel, and electrically connecting the auxiliary electrode and the second electrode, and the auxiliary electrode and the second electrode are connected in parallel , Thereby reducing the resistance of the second electrode, thereby alleviating the voltage drop problem, and improving the visual effect of the user's viewing.

The first aspect of the present application provides a display panel. The display panel includes a substrate, a light-emitting unit, and an auxiliary electrode. The light-emitting unit includes a first electrode, a light-emitting layer, and a second electrode. The light-emitting layer and the second electrode are arranged adjacent to the substrate, the light-emitting layer is arranged on the side of the first electrode away from the substrate, and the second electrode is arranged on the light-emitting layer away from the substrate. On one side of the first electrode, the first electrode is loaded with a first voltage signal, the second electrode is loaded with a second voltage signal, and the first voltage signal and the second voltage signal cooperate with each other to make the light-emitting unit To emit light, the auxiliary electrode is electrically connected with the second electrode and the auxiliary electrode is connected in parallel with the second electrode.

In the display panel provided by the first aspect of the application, an auxiliary electrode is added to the display panel, and the auxiliary electrode is electrically connected to the second electrode and the auxiliary electrode is connected in parallel with the second electrode, thereby reducing the The resistance of the two electrodes. The reduction of the resistance of the second electrode can effectively alleviate the problem of voltage drop, so that the brightness of the organic light emitting diode display panel is uniformly distributed, and the user's viewing visual effect is improved.

A second aspect of the present application provides a method for manufacturing a display panel, and the manufacturing method includes:

Provide substrate;

Forming a first electrode on one side of the substrate;

Forming a light-emitting layer on the side of the first electrode away from the substrate;

Forming a second electrode on the side of the light-emitting layer away from the first electrode; and

An auxiliary electrode is formed on the side of the light-emitting layer away from the first electrode, and the auxiliary electrode is electrically connected with the second electrode and the auxiliary electrode is connected in parallel with the second electrode.

The preparation method provided by the second aspect of the application has a simple preparation process and low cost. The auxiliary electrode is formed on the side of the light-emitting layer away from the first electrode, and the auxiliary electrode is electrically connected to the second electrode And the auxiliary electrode is connected in parallel with the second electrode, thereby reducing the resistance of the second electrode. The reduction of the resistance of the second electrode can effectively alleviate the problem of voltage drop, so that the brightness of the display panel is evenly distributed, and the user's viewing visual effect is improved.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will describe the drawings that need to be used in the embodiments of the present application.

FIG. 1 is a schematic diagram of the structure of a display panel in an embodiment of the application.

2 is a schematic diagram of the structure of a display panel in another embodiment of the application.

FIG. 3 is a schematic diagram of the structure of the display panel in the first embodiment of the application.

FIG. 4 is a schematic diagram of the structure of the display panel in the second embodiment of this application.

FIG. 5 is a schematic diagram of the structure of the display panel in the third embodiment of this application.

FIG. 6 is a schematic diagram of the structure of the display panel in the fourth embodiment of this application.

FIG. 7 is a schematic diagram of the structure of the display panel in the fifth embodiment of this application.

FIG. 8 is a schematic diagram of the structure of the display panel in the sixth embodiment of this application.

FIG. 9 is a schematic diagram of the structure of the display panel in the seventh embodiment of this application.

FIG. 10 is a schematic structural diagram of a display panel in the eighth embodiment of this application.

FIG. 11 is a process flow diagram of a manufacturing method of a display panel in an embodiment of the application.

FIG. 12 is a process flow diagram included in step S120 in FIG. 11.

FIG. 13 is a process flow diagram of a manufacturing method of a display panel in another embodiment of the application.

FIG. 14 is a schematic diagram of an electronic device in an embodiment of this application.

Description of the drawings:

Display panel-1, substrate-10, light-emitting unit-20, first electrode-21, light-emitting layer-22, second electrode-23, thin film transistor-24, pixel defining layer-25, buffer layer-26, via-hole- 27. Auxiliary electrode-30, second signal transmission line-40, second input terminal-41, first direction-D1, barrier layer-50, signal electrode-60, film encapsulation layer-70, electronic device-100, housing- 200, motherboard-300, display device-400.

Detailed ways

The following are the preferred embodiments of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of this application, several improvements and modifications can be made, and these improvements and modifications are also regarded as the original The scope of protection applied for.

Please refer to FIG. 1, which is a schematic structural diagram of a display panel in an embodiment of the application. The embodiment of the present application provides a display panel 1, and the display panel 1 includes a substrate 10, a light-emitting unit 20, and an auxiliary electrode 30. The light-emitting unit 20 includes a first electrode 21, a light-emitting layer 22, and a second electrode 23. The first electrode 21 is disposed adjacent to the substrate 10 compared to the light-emitting layer 22 and the second electrode 23. The light-emitting layer 22 is provided on the side of the first electrode 21 away from the substrate 10, and the second electrode 23 is provided on the side of the light-emitting layer 22 away from the first electrode 21. The first electrode 21 is loaded with a first voltage signal, and the second electrode 23 is loaded with a second voltage signal. The first voltage signal and the second voltage signal cooperate with each other to make the light-emitting unit 20 emit light. The auxiliary electrode 30 is electrically connected with the second electrode 23 and the auxiliary electrode 30 is connected in parallel with the second electrode 23.

First, this application first briefly introduces the aforementioned components.

The display panel 1 mainly plays a display role in the electronic device 100, and is used to convert electrical signals into optical signals and emit light to form images, or text, or videos, etc., for users to watch. Among them, the display panel 1 usually has a display area and a non-display area, and the display area is usually an area for displaying text, pictures, videos, etc. The non-display area is usually arranged at the periphery of the display area, and the non-display area is usually opaque to shield the wiring in the display screen. Optionally, the display panel 1 may not include a non-display area, so as to be configured as a full-screen structure. Further optionally, when the display panel 1 does not include a non-display area and constitutes a full screen, devices such as a distance sensor, an ambient light sensor, a front camera, etc. may be provided in the electronic device 100 and located in the display area of the display panel 1. Optionally, the display panel 1 of the present application includes an Organic Light-Emitting Diode (OLED) panel. When the display panel 1 is an organic light-emitting diode display (Organic Light-Emitting Diode, OLED) panel, the display panel 1 can be a passive matrix OLED display panel (Passive Matrix OLED, PMOLED) or an active matrix OLED display panel (Active Matrix OLED, AMOLED). Further optionally, the display panel 1 of the present application is an active matrix OLED display panel (Active Matrix OLED, AMOLED).

The substrate 10 is the foundation of the entire display panel 1. The substrate 10 in the display panel 1 mainly functions to fix and support other components in the display panel 1. For example, the substrate 10 can fix and support the light-emitting unit 20 and the auxiliary electrode 30 of the present application. The light emitting unit 20 mainly plays a role of emitting light in the display panel 1. The light emitting unit 20 may include a first electrode 21, a light emitting layer 22, and a second electrode 23. The first electrode 21 is loaded with a first voltage signal, and the second electrode 23 is loaded with a second voltage signal. The first electrode 21 and the second electrode 23 may be an anode and a cathode, and the first voltage signal and the second voltage signal may be a positive voltage signal and a negative voltage signal. When the first electrode 21 is an anode and the second electrode 23 is a cathode, the first voltage signal is a positive voltage signal, and the second voltage signal is a negative voltage signal. When the first electrode 21 is a cathode and the second electrode 23 is an anode, the first voltage signal is a negative voltage signal, and the second voltage signal is a positive voltage signal. Therefore, the first electrode 21 and the second electrode 23 can send electrons and holes to the light-emitting layer 22, and when the electrons and holes are combined in the light-emitting layer 22, they then emit photons, thereby emitting light. Optionally, please also refer to FIG. 2, which is a schematic structural diagram of a display panel in another embodiment of this application. As shown in FIG. 2, the structure of the display panel 1 provided by another embodiment of the present application is substantially the same as the structure of the display panel 1 provided in FIG. 1, except that the light-emitting unit 20 of the present application may further include a thin film transistor 24 (Thin Film Transistor, TFT), and the thin film transistor 24 is located between the substrate 10 and the first electrode 21. Among them, the thin film transistor 24 functions as a "switch" in the display panel 1, and is used to control whether the light emitting unit 20 emits light. Optionally, the display panel of the present application further includes a thin film encapsulation 70 (Thin Film Encapsulation, TFE). The thin film encapsulation layer 70 is provided on the auxiliary electrode 30 and the side of the second electrode 23 away from the light emitting layer 22. The thin film encapsulation layer 70 is used to protect the auxiliary electrode 30 and the light-emitting unit 20, prevent other structures in the display panel 1 from affecting the auxiliary electrode 30 and the light-emitting unit 20, and also prevent external water vapor and impurities from entering the auxiliary electrode 30 and the light-emitting unit 20 .

In addition, the “one side” mentioned in the present application, for example, “the light-emitting layer 22 is provided on the side of the first electrode 21 away from the substrate 10”, it can be understood that the light-emitting layer 22 is directly provided on the first electrode 21. The surface facing away from the substrate 10 can also be understood as the light-emitting layer 22 is provided in the direction of the first electrode 21 away from the substrate 10, and the light-emitting layer 22 and the first electrode 21 are spaced apart, that is, the light-emitting layer 22 and the first electrode 21 There are other structures in the room.

It can be seen from the foregoing that in the related art, the first electrode 21 or the second electrode 23 has resistance due to its own resistance. Therefore, when a current flows through the first electrode 21 or the second electrode 23 to generate holes or electrons, the first electrode 21 Or the second electrode 23 will shunt part of the voltage due to the existence of the resistance, that is, the current will shunt, thereby causing the phenomenon of voltage drop. The generation of the voltage drop will cause the current in the display panel 1 to decrease, and the decrease of the current will cause the brightness of the display panel 1 to decrease and uneven brightness. Therefore, the display effect of the display panel 1 is severely affected, and the visual effect viewed by the user is affected.

Therefore, in the present application, an auxiliary electrode 30 is added to the display panel 1, and the auxiliary electrode 30 is electrically connected to the second electrode 23 and the auxiliary electrode 30 is connected in parallel with the second electrode 23. Furthermore, the resistance of the second electrode 23 connected in parallel with the auxiliary electrode 30 is reduced. The reduction in the resistance of the second electrode 23 can effectively alleviate the voltage drop problem, thereby improving the brightness of the display panel 1 and uniformly distributing the brightness of the display panel 1 to improve the visual effect of the user's viewing. Regarding whether the second electrode 23 is an anode or a cathode, and the specific structure of the auxiliary electrode 30 in the display panel 1, this application will give a detailed introduction later in this application.

Next, this application will first introduce the specific structure of the display panel 1 when the first electrode 21 is an anode and the second electrode 23 is a cathode. Please also refer to FIG. 3, which is a schematic diagram of the structure of the display panel in the first embodiment of this application. The structure of the display panel 1 provided by the embodiment of the present application is substantially the same as the structure of the display panel 1 provided in FIG. 1, except that the first electrode 21 of the display panel 1 in the first embodiment of the present application is an anode. The second electrode 23 is a cathode. The light-emitting unit 20 further includes a pixel defining layer 25. The pixel defining layer 25 is provided on the side of the first electrode 21 facing away from the substrate 10, and the pixel defining layer 25 is provided with Hole, the light-emitting layer 22 is provided in the through hole and electrically connected to the first electrode 21, and the second electrode 23 is provided on the pixel defining layer 25 and the light-emitting layer 22 is away from the substrate 10 The second electrode 23 is electrically connected to the light-emitting layer 22, and the auxiliary electrode 30 is provided on the side of the pixel defining layer 25 away from the substrate 10.

The pixel defining layer 25 divides the display panel 1 into a plurality of sub-pixel regions, and the self-luminous light-emitting layer 22 is disposed in the sub-pixel regions. When the second electrode 23 is a cathode, that is, the auxiliary electrode 30 is connected in parallel with the cathode. At this time, the resistance of the cathode is reduced, thereby alleviating the problem of voltage drop due to the cathode, thereby improving the brightness of the display panel 1 and making the display panel 1. The brightness is evenly distributed to enhance the visual effect of users’ viewing. In addition, the second electrode 23 and the auxiliary electrode 30 are both provided on the side of the pixel defining layer 25 away from the substrate 10. Therefore, there are two situations: the first case is that the second electrode 23 is more expensive than the auxiliary electrode 30. Close to the pixel defining layer 25; in the second case, the auxiliary electrode 30 is closer to the pixel defining layer 25 than the second electrode 23. This application will be introduced in detail below.

3 again, when the second electrode 23 is closer to the pixel defining layer 25 than the auxiliary electrode 30, the second electrode 23 is provided on the pixel defining layer 25 and the light-emitting layer 22, and the auxiliary The electrode 30 is arranged on the second electrode 23. At this time, it is only necessary to prepare another layer of auxiliary electrode 30 on the second electrode 23 of the display panel 1 in the related art. Therefore, the display panel 1 provided in this embodiment has a simple structure, is easier to prepare, and can be used simply and effectively. The resistance of the second electrode 23 is reduced, which alleviates the problem of voltage drop.

In addition, in the first embodiment of the present application, the orthographic projection of the auxiliary electrode 30 on the substrate 10 and the orthographic projection of the light-emitting layer 22 on the substrate 10 partially overlap. The orthographic projection of the auxiliary electrode 30 on the substrate 10 in the present application overlaps with the orthographic projection of the light-emitting layer 22 on the substrate 10, that is, the orthographic projection of a part of the light-emitting layer 22 on the substrate 10 does not coincide with that of the auxiliary electrode. The orthographic projection of 30 on the substrate 10 coincides. At this time, only the second electrode 23 is provided on the part of the light-emitting layer 22, and the auxiliary electrode 30 is not provided. Therefore, the light transmittance in the light-emitting layer 22 can be increased, and the display panel 1 display effect.

Please also refer to FIG. 4, which is a schematic diagram of the structure of the display panel in the second embodiment of this application. The structure of the display panel 1 provided by the second embodiment of the present application is substantially the same as the structure of the display panel 1 provided by the first embodiment of the present application. The difference is that the auxiliary electrode 30 of the present application is formed on the substrate 10 The orthographic projection is located within the orthographic projection range of the pixel defining layer 25 on the substrate 10. The orthographic projection of the auxiliary electrode 30 on the substrate 10 of the present application is within the orthographic projection range of the pixel defining layer 25 on the substrate 10, which means that only the side of the light emitting layer 22 facing away from the substrate 10 is provided. There is a second electrode 23 and no auxiliary electrode 30 is provided. At this time, the transmittance of light in the light-emitting layer 22 can be further increased, and the display effect of the display panel 1 can be further improved.

Please also refer to FIG. 5, which is a schematic diagram of the structure of the display panel in the third embodiment of this application. The structure of the display panel 1 provided by the third embodiment of the present application is substantially the same as the structure of the display panel 1 provided by the second embodiment of the present application, except that the auxiliary electrode 30 of the present application is provided on the pixel defining layer 25 The second electrode 23 is disposed on the auxiliary electrode 30 and the light-emitting layer 22. The auxiliary electrode 30 of the present application is closer to the pixel defining layer 25 than the second electrode 23, so that the second electrode 23 is located at the outermost side of the display panel 1, thereby making the second electrode 23 easier to connect with other circuits. Secondly, the side of the light-emitting unit 20 away from the substrate 10 is relatively flat, so it is easier to prepare other components on the second electrode 23. In addition, the embodiment of the present application illustrates that the orthographic projection of the auxiliary electrode 30 on the substrate 10 is located within the orthographic projection range of the pixel defining layer 25 on the substrate 10. As for other forms, for example, the orthographic projection of the auxiliary electrode 30 on the substrate 10 and the orthographic projection of the light-emitting layer 22 on the substrate 10 partially or completely overlap, which can also solve the technical problem of the present application. It should also belong to the scope of protection of this application.

Please refer to FIG. 5 again. In the embodiment of the present application, the thickness of the auxiliary electrode 30 is greater than the thickness of the second electrode 23. First of all, the thickness mentioned in this application can be understood as the dimension in the direction perpendicular to the surface of the substrate 10 on which the light-emitting unit 20 is provided, that is, the thickness dimension. It can be seen from the above that the introduction of the auxiliary electrode 30 can reduce the resistance of the second electrode 23, thereby alleviating the problem of voltage drop generated by the second electrode 23. When the total thickness of the second electrode 23 and the auxiliary electrode 30 is equal, since only the second electrode 23 is provided on the corresponding light-emitting layer 22, the auxiliary electrode 30 is not provided, and the auxiliary electrode 30 will only reduce the thickness of the second electrode 23. Resistance does not affect the transmittance of the light emitted by the light-emitting layer 22. Therefore, when the thickness of the second electrode 23 is smaller than the thickness of the auxiliary electrode 30, the thickness of the second electrode 23 that affects the transmittance of the light emitted by the light-emitting layer 22 is reduced, thereby further increasing the transmittance of the light and improving the display panel 1 display effect.

Please also refer to FIG. 6, which is a schematic diagram of the structure of the display panel in the fourth embodiment of this application. The structure of the display panel 1 provided by the fourth embodiment of the present application is substantially the same as the structure of the display panel 1 provided by the second embodiment of the present application. The difference is that the light-emitting unit 20 of the present application further includes a buffer layer 26. The buffer layer 26 is provided between the second electrode 23 and the auxiliary electrode 30, and the buffer layer 26 is used to prevent impurities from entering the light emitting layer 22.

In terms of material, the material of the second electrode 23 of the present application may be the same as the material of the auxiliary electrode 30, or the material of the second electrode 23 may be different from the material of the auxiliary electrode 30. The function of the auxiliary electrode 30 of the present application is mainly to be connected in parallel with and electrically connected to the second electrode 23, thereby reducing the resistance of the second electrode 23. The material of the second electrode 23 generally includes, but is not limited to, magnesium, aluminum, silver and the like. The resistance of magnesium, aluminum, and silver is usually higher. Therefore, the material of the auxiliary electrode 30 can be different from that of the second electrode 23. For example, the auxiliary electrode 30 can be made of a metal or metal oxide with lower resistance, such as magnesium alloy or aluminum. Alloy and so on. However, when the material of the auxiliary electrode 30 is different from the material of the second electrode 23, the impurity elements in the auxiliary electrode 30 will diffuse downward to other structures in the display panel 1, such as the second electrode 23, the light-emitting layer 22, and so on. This will affect the signal and light transmission efficiency, and further affect the display effect of the display panel 1. Therefore, in the present application, a buffer layer 26 is added between the second electrode 23 and the auxiliary electrode 30. The buffer layer 26 can effectively prevent the impurity elements in the auxiliary electrode 30 from diffusing into other structures in the display panel 1, so that the display panel 1 The performance is more stable. At the same time, the arrangement of the buffer layer 26 can also block water vapor and oxygen in the outside, and prevent water vapor and oxygen from entering other structures in the display panel 1. Optionally, the buffer layer 26 may include multiple sub-buffer layers, and the material of the buffer layer 26 includes, but is not limited to, one or two of inorganic substances or organic substances. For example, the inorganic substance may be silicon oxide or silicon oxynitride, and the organic substance may be a polymer material such as polyimide resin, epoxy resin, or acrylic resin. The method for forming the buffer layer 26 may be chemical vapor deposition, spin coating, spraying, or the like.

Please refer to FIG. 6 again, the buffer layer 26 is provided with a via 27, and the second electrode 23 and the auxiliary electrode 30 are electrically connected through the via 27. Since the second electrode 23 and the auxiliary electrode 30 need to be electrically connected, in an embodiment of the present application, a via 27 may be provided on the buffer layer 26 to expose part of the second electrode 23, and then the auxiliary electrode 30 is prepared. Therefore, the auxiliary electrode 30 fills the via hole 27, so that the auxiliary electrode 30 is electrically connected to the second electrode 23 through the via hole 27. Wherein, the number of via holes 27 may be one or multiple. And when the number of vias 27 is multiple, the electrical connection performance between the second electrode 23 and the auxiliary electrode 30 can be further improved, so that the signal transmission can be faster.

Please also refer to FIG. 7, which is a schematic diagram of the structure of the display panel in the fifth embodiment of this application. The structure of the display panel 1 provided by the fifth embodiment of the present application is substantially the same as the structure of the display panel 1 provided by the fourth embodiment of the present application. The difference is that the buffer layer 26 of the present application is formed on the substrate 10 The orthographic projection is located in the orthographic projection of the second electrode 23 on the substrate 10 and the orthographic projection of the auxiliary electrode 30 on the substrate 10. The auxiliary electrode 30 is electrically connected to the second electrode 23 Part of the buffer layer 26 is covered. In another embodiment of the present application, the orthographic projection of the buffer layer 26 on the substrate 10 is smaller than the orthographic projection of the second electrode 23 on the substrate 10 and the orthographic projection of the auxiliary electrode 30 on the substrate 10 Therefore, the auxiliary electrode 30 can be electrically connected to the second electrode 23 from the portion of the second electrode 23 that is not covered with the buffer layer 26. It can also be understood that the size of the buffer layer 26 in a direction parallel to the surface of the substrate 10 where the light-emitting unit 20 is provided is smaller than the size of the second electrode 23 and the auxiliary electrode 30 in a direction parallel to the surface of the substrate 10 where the light-emitting unit 20 is provided. . At this time, the auxiliary electrode 30 can be electrically connected to the second electrode 23 from one side or opposite sides of the auxiliary electrode 30.

Please also refer to FIG. 8, which is a schematic diagram of the structure of the display panel in the sixth embodiment of this application. The structure of the display panel 1 provided by the sixth embodiment of the present application is substantially the same as the structure of the display panel 1 provided by the fourth embodiment of the present application. The difference is that the display panel 1 of the present application further includes a first signal transmission line, And a second signal transmission line 40. The first signal transmission line is electrically connected to a plurality of the light-emitting units 20 and is electrically connected to the first electrode 21 in each of the light-emitting units 20, and the second signal transmission line 40 is electrically connected A plurality of the light-emitting units 20 are electrically connected to the second electrodes 23 in each of the light-emitting units 20, and the resistance values of each part of the second signal transmission line 40 are equal.

In this application, the first signal transmission line transmits the first voltage signal for the first electrode 21, and the second signal transmission line 40 transmits the second voltage signal for the second electrode 23. For example, when the first electrode 21 is a positive electrode, the first signal transmission line is a VDD line, and the first voltage signal is a positive voltage signal; when the second electrode 23 is a negative electrode, the second signal transmission line 40 is a VSS line, and the second voltage signal The signal is a negative voltage signal. The resistance value of each part of the second signal transmission line 40 described in this application is equal, and the voltage drop across the second signal transmission line 40 can be made equal. Secondly, the resistance value of each part of the second signal transmission line 40 is equal, which makes it easier to control the resistance of the second electrode 23 electrically connected to the second signal transmission line 40.

Please refer to FIG. 8 again. In the embodiment of the present application, the second signal transmission line 40 includes a second input terminal 41, and the second input terminal 41 is used to load the second voltage signal. The second signal transmission line 40 For transmitting the second voltage signal to the second electrode 23, for the light-emitting unit 20 electrically connected to the second signal transmission line 40, the auxiliary electrode is far away from the second input terminal 41 The resistance value of 30 is smaller than the resistance value of the auxiliary electrode 30 close to the second input terminal 41.

The second input terminal 41 of the second signal transmission line 40 can be loaded with the second voltage signal, and then the second voltage signal is transmitted to the electrically connected second electrode 23 through the second signal transmission line 40, because the signal is in the second signal transmission line 40 and the second electrode 23. A voltage drop is generated during the transmission of the two electrodes 23. Therefore, in the related art, the second electrode 23 is far away from the second input terminal 41. Since the length of the second signal transmission line 40 passing through is long, the voltage drop is generated The larger is, the brightness far away from the second input terminal 41 in the display panel 1 is smaller than the brightness near the second input terminal 41, and finally the brightness of the display panel 1 is uneven. Therefore, the present application makes the resistance value of the auxiliary electrode 30 far away from the second input terminal 41 smaller than the resistance value of the auxiliary electrode 30 close to the second input terminal 41, by changing the resistance value of the auxiliary electrode 30 Change the resistance value of the second electrode 23 so that the voltage drop across the display panel 1 is the same, so that the brightness far away from the second input terminal 41 is equal to the brightness close to the second input terminal 41, and finally the brightness of the display panel 1 is uniform , To further improve the display effect of the display panel 1.

Optionally, the resistance of the auxiliary electrode 30 gradually increases from a direction away from the second input terminal 41 to close to the second input terminal 41. By adjusting the resistance value of the auxiliary electrode 30 in the present application, not only the voltage drop can be effectively relieved, but also the voltage drop across the entire display panel 1 can be made the same, thereby making the brightness of the display panel 1 consistent.

Further optionally, the thickness of the auxiliary electrode 30 gradually decreases from a direction away from the second input end 41 to close to the second input end 41. The thickness of the auxiliary electrode 30 of the present application gradually decreases from the direction away from the second input terminal 41 to the direction close to the second input terminal 41, so that the resistance of the auxiliary electrode 30 can change from being far away from the second input terminal 41 to close to the second input terminal 41. The direction of the second input terminal 41 gradually increases.

Further optionally, a direction parallel to the surface of the substrate 10 close to the first electrode 21 is defined as a first direction D1, and the size of the auxiliary electrode 30 in the first direction D1 is from far away from the input end The direction towards the input terminal gradually decreases. Please refer to FIG. 4 again. The arrow direction in FIG. 4 is the first direction D1. The size of the auxiliary electrode 30 in the first direction D1 of the present application gradually decreases from the direction away from the input terminal to the direction close to the input terminal, so that the resistance of the auxiliary electrode 30 is moved away from the second input terminal 41 The direction to approach the second input terminal 41 gradually increases.

The above content introduces the case where the auxiliary electrode 30 is electrically connected to the cathode and connected in parallel. Next, this application will continue to introduce the case where the auxiliary electrode 30 is electrically connected to the anode and connected in parallel. Please also refer to FIG. 9, which is a schematic diagram of the structure of the display panel in the seventh embodiment of this application. The structure of the display panel 1 provided by the seventh embodiment of the present application is substantially the same as the structure of the display panel 1 provided by the first embodiment of the present application. The difference is that the first electrode 21 of the present application is a cathode, and the second The second electrode 23 is an anode. The light-emitting unit 20 further includes a pixel defining layer 25. The pixel defining layer 25 is provided on the side of the first electrode 21 away from the substrate 10, and the pixel defining layer 25 is provided with Hole, the light-emitting layer 22 is provided in the through hole and electrically connected to the first electrode 21, and the second electrode 23 is provided on the pixel defining layer 25 and the light-emitting layer 22 is away from the substrate 10 The second electrode 23 is electrically connected to the light-emitting layer 22, and the auxiliary electrode 30 is provided on the side of the pixel defining layer 25 away from the substrate 10. The foregoing content of the present application has introduced that the auxiliary electrode 30 is electrically connected and connected in parallel with the second electrode 23, that is, the cathode, so as to reduce the resistance of the cathode, thereby alleviating the problem of voltage drop caused by the resistance of the cathode. In this embodiment, the second electrode 23 is the anode, so the auxiliary electrode 30 can also be electrically connected to the anode and connected in parallel to reduce the resistance of the anode, thereby alleviating the problem of voltage drop due to the resistance of the anode.

Please also refer to FIG. 10, which is a schematic structural diagram of a display panel in the eighth embodiment of this application. In the embodiment of the present application, the display panel 1 includes a substrate 10, a light emitting unit 20, an auxiliary electrode 30, a barrier layer 50, and a signal electrode 60. The light emitting unit 20 includes a first electrode 21, a light emitting layer 22, and a second electrode. The first electrode 21 is provided adjacent to the substrate 10 compared to the light-emitting layer 22 and the second electrode 23, and the light-emitting layer 22 is provided on the first electrode 21 away from the substrate 10 On one side, the second electrode 23 is provided on the side of the light-emitting layer 22 away from the first electrode 21, the first electrode 21 is loaded with a first voltage signal, and the second electrode 23 is loaded with a second voltage signal , The first voltage signal and the second voltage signal cooperate with each other to make the light-emitting unit 20 emit light, the blocking layer 50 is provided on the side of the second electrode 23 away from the light-emitting layer 22, and The auxiliary electrode 30 is provided on the side of the barrier layer 50 away from the second electrode 23, the signal electrode 60 is provided on the side of the auxiliary electrode 30 away from the barrier layer 50, and the signal electrode 60 is connected to the The first electrode 21 is electrically connected, and the auxiliary electrode 30 is electrically connected to the signal electrode 60 and the auxiliary electrode 30 is connected in parallel with the signal electrode 60, so that the auxiliary electrode 30 and the first electrode 21 are electrically connected. Electric connection.

The above-mentioned auxiliary electrodes 30 of the present application are all electrically connected to and in parallel with the second electrode 23, thereby reducing the resistance of the second electrode 23. In this embodiment, the auxiliary electrode 30 is electrically connected to the first electrode 21 in parallel. Moreover, in this embodiment, the auxiliary electrode 30 is not directly electrically connected to the first electrode 21 and in parallel. Instead, the auxiliary electrode 30, the barrier layer 50, and the signal electrode 60 are stacked on the second electrode 23 in order, and the signal electrode 60 is An electrode 21 is electrically connected. At this time, the auxiliary electrode 30 is electrically connected to the signal electrode 60, and the signal electrode 60 is electrically connected to the first electrode 21. Therefore, the auxiliary electrode 30 can be electrically connected to the first electrode 21 indirectly and in parallel. The arrangement of the barrier layer 50 can isolate the auxiliary electrode 30 and the signal electrode 60 from each other. In this application, a signal electrode 60 is added to the auxiliary electrode 30 so that the signal electrode 60 is in the outermost layer of the display panel 1. Therefore, the signal electrode 60 can be electrically connected to the circuit easily and conveniently, so that the circuit is electrically connected to the first electrode 21 located on the bottom layer, and the circuit connection becomes more concise. Optionally, the first electrode 21 is an anode, and the second electrode 23 is a cathode. At this time, the auxiliary electrode 30 is electrically connected to and in parallel with the anode, thereby reducing the resistance of the anode. Alternatively, the first electrode 21 is a cathode, and the second electrode 23 is an anode. At this time, the auxiliary electrode 30 is electrically connected to the cathode and in parallel, so as to reduce the resistance of the cathode.

The above is the detailed structure of the display panel 1 of the present application. According to the embodiment of the present application, a manufacturing method of the display panel 1 is also provided. This method can be used to prepare the display panel 1 of the above scheme. Of course, the display panel 1 can also be prepared using other preparation methods, which is not limited in this application. The display panel 1 and the manufacturing method of the display panel 1 provided in the embodiments of the present application can be used in conjunction or independently, which does not affect the essence of the present application.

Please refer to FIG. 11, which is a process flow diagram of a method for manufacturing a display panel in an embodiment of this application. An embodiment of the present application provides a manufacturing method of the display panel 1, and the manufacturing method includes S100, S110, S120, S130, and S140. Among them, S100, S110, S120, S130, S140 are described in detail as follows.

S100, a substrate 10 is provided.

S110, forming a first electrode 21 on one side of the substrate 10.

S120, forming a light-emitting layer 22 on the side of the first electrode 21 away from the substrate 10.

S130, forming a second electrode 23 on the side of the light-emitting layer 22 away from the first electrode 21. and

S140. An auxiliary electrode 30 is formed on the side of the light-emitting layer 22 away from the first electrode 21, and the auxiliary electrode 30 is electrically connected to the second electrode 23, and the auxiliary electrode 30 is electrically connected to the second electrode. The electrodes 23 are connected in parallel.

The preparation method provided by the embodiment of the present application has a simple preparation process and low cost. The auxiliary electrode 30 is formed on the side of the light-emitting layer 22 away from the first electrode 21, and the auxiliary electrode 30 is connected to the second electrode 21. The electrode 23 is electrically connected and the auxiliary electrode 30 is connected in parallel with the second electrode 23 so as to reduce the resistance of the second electrode 23. The reduction of the resistance of the second electrode 23 can effectively alleviate the problem of voltage drop, so that the brightness of the organic light emitting diode display panel 1 is uniformly distributed, and the visual effect of the user's viewing is improved.

Please also refer to FIG. 12, which is a process flow diagram included in step S120 in FIG. 11. Among them, S120 "form the light emitting layer 22 on the side of the first electrode 21 away from the substrate 10" includes S121, S122, and S123. Among them, S121, S122, and S123 are described in detail as follows.

S121, forming a pixel defining layer 25 on the side of the first electrode 21 away from the substrate 10.

S122, opening a through hole in the pixel defining layer 25 to expose a part of the first electrode 21. and

S123, forming a light emitting layer 22 in the through hole.

In this application, the pixel defining layer 25 is formed on the side of the first electrode 21 away from the substrate 10, and the pixel defining layer 25 is opened to form a sub-pixel area, and then the light emitting layer 22 is formed in the through hole. The preparation method provided in this embodiment has a simple process, and can effectively prepare the light-emitting layer 22 arranged at intervals and insulated.

Please also refer to FIG. 13, which is a process flow diagram of a manufacturing method of a display panel in another embodiment of this application. A manufacturing method of a display panel 1, characterized in that the manufacturing method includes S200, S210, S220, S230, S240, S250, S260. Among them, S200, S210, S220, S230, S240, S250, S260 are described in detail as follows.

S200, a substrate 10 is provided.

S210, forming a first electrode 21 on one side of the substrate 10.

S220, forming a light-emitting layer 22 on the side of the first electrode 21 away from the substrate 10.

S230, forming a second electrode 23 on a side of the light-emitting layer 22 away from the first electrode 21.

S240, forming a barrier layer 50 on the side of the second electrode 23 away from the light-emitting layer 22.

S250, forming an auxiliary electrode 30 on a side of the barrier layer 50 away from the second electrode 23. and

S260. A signal electrode 60 is formed on the side of the auxiliary electrode 30 away from the barrier layer 50, and the signal electrode 60 is electrically connected to the first electrode 21 and the auxiliary electrode 30, and the auxiliary electrode By electrically connecting the signal electrode 60, the auxiliary electrode 30 is electrically connected to the first electrode 21 and the auxiliary electrode 30 is connected in parallel with the first electrode 21.

Another embodiment of the present application provides a preparation method for electrically connecting the auxiliary electrode 30 and the first electrode 21. The preparation method provided by the present application has simple process and low cost, and can not only prepare the auxiliary electrode 30 and the first electrode 21 for electrical connection In addition, the display panels 1 are connected in parallel to reduce the resistance of the first electrode 21, thereby alleviating the problem of voltage drop due to the first electrode 21. It is also possible to electrically connect the line to the signal electrode 60, thereby making the wiring simpler.

Please also refer to FIG. 14, which is a schematic diagram of an electronic device in an embodiment of this application. The embodiment of the present application provides an electronic device 100. The electronic device 100 includes a housing 200, and a motherboard 300 and a display device 400 arranged in the housing 200. The motherboard 300 is electrically connected to the display device 400. The display device 400 includes the display panel 1 provided in the embodiment of the present application.

This application provides an electronic device 100. The electronic equipment 100 provided in this application includes, but is not limited to, mobile phones, tablet computers, notebook computers, handheld computers, personal computers (PCs), personal digital assistants (PDAs), portable media players (Portable Media Players). , PMP), navigation devices, wearable devices, smart bracelets, pedometers and other mobile terminals, and fixed terminals such as digital TVs and desktop computers.

The electronic device 100 provided in the embodiment of the present application can effectively improve the display brightness of the electronic device 100 by using the display panel 1 provided in the embodiment of the present application, and make the brightness of all parts equal, greatly improving the display of the electronic device 100 The effect is of great practicality.

The above provides a detailed introduction to the content provided by the implementation of the application. This article explains and explains the principles and implementations of the application. The above description is only used to help understand the methods and core ideas of the application; at the same time, for the field General technical personnel, based on the idea of this application, will have changes in the specific implementation and scope of application. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

A display panel, wherein the display panel includes a substrate, a light-emitting unit, and an auxiliary electrode, the light-emitting unit includes a first electrode, a light-emitting layer, and a second electrode, and the first electrode is compared with the A light-emitting layer and the second electrode are disposed adjacent to the substrate, the light-emitting layer is disposed on a side of the first electrode away from the substrate, and the second electrode is disposed on the light-emitting layer away from the first electrode On one side, the first electrode is loaded with a first voltage signal, the second electrode is loaded with a second voltage signal, and the first voltage signal and the second voltage signal cooperate with each other to make the light-emitting unit emit light, so The auxiliary electrode is electrically connected with the second electrode and the auxiliary electrode is connected in parallel with the second electrode.
7. The display panel of claim 1, wherein the first electrode is an anode, the second electrode is a cathode, and the light-emitting unit further comprises a pixel defining layer, and the pixel defining layer is provided on the first One side of an electrode away from the substrate, the pixel defining layer is provided with a through hole, the light-emitting layer is provided in the through hole and electrically connected to the first electrode, and the second electrode is provided on the The pixel defining layer and the light emitting layer are away from the substrate, the second electrode is electrically connected to the light emitting layer, and the auxiliary electrode is provided on the pixel defining layer away from the substrate.
3. The display panel of claim 2, wherein the orthographic projection of the auxiliary electrode on the substrate partially overlaps the orthographic projection of the light-emitting layer on the substrate.
3. The display panel of claim 2, wherein the second electrode is provided on the pixel defining layer and the light-emitting layer, and the auxiliary electrode is provided on the second electrode.
8. The display panel of claim 4, wherein the orthographic projection of the auxiliary electrode on the substrate is within an orthographic projection range of the pixel defining layer on the substrate.
3. The display panel of claim 2, wherein the auxiliary electrode is disposed on the pixel defining layer, and the second electrode is disposed on the auxiliary electrode and the light-emitting layer.
The display panel of claim 1, wherein the thickness of the auxiliary electrode is greater than the thickness of the second electrode.
8. The display panel of claim 1, wherein the light-emitting unit further comprises a buffer layer, the buffer layer is provided between the second electrode and the auxiliary electrode, and the buffer layer is used to prevent Impurities enter the light-emitting layer.
8. The display panel of claim 8, wherein the buffer layer is provided with a via hole, and the second electrode and the auxiliary electrode are electrically connected through the via hole.
The display panel of claim 8, wherein the orthographic projection of the buffer layer on the substrate is positioned on the orthographic projection of the second electrode on the substrate, and the auxiliary electrode is on the substrate. In the above orthographic projection, the auxiliary electrode is electrically connected to the part of the second electrode that does not cover the buffer layer.
7. The display panel of claim 1, wherein the display panel further comprises a first signal transmission line and a second signal transmission line, and the first signal transmission line is electrically connected to a plurality of the light-emitting units and is connected to each of the The first electrode in the light-emitting unit is electrically connected, the second signal transmission line is electrically connected to a plurality of the light-emitting units and is electrically connected to the second electrode in each of the light-emitting units, and each of the second signal transmission lines is The resistance values of the parts are equal.
11. The display panel of claim 11, wherein the second signal transmission line comprises a second input terminal, the second input terminal is used for loading the second voltage signal, and the second signal transmission line is used for The second voltage signal is transmitted to the second electrode. For the light-emitting unit electrically connected to the second signal transmission line, the resistance value of the auxiliary electrode far from the second input terminal is smaller than that of the auxiliary electrode near the The resistance value of the auxiliary electrode at the second input terminal.
11. The display panel of claim 12, wherein the resistance of the auxiliary electrode gradually increases from a direction away from the second input terminal to a direction close to the second input terminal.
13. The display panel of claim 13, wherein the thickness of the auxiliary electrode gradually decreases from a direction away from the second input terminal to a direction close to the second input terminal.
The display panel of claim 13, wherein a direction parallel to the surface of the substrate close to the first electrode is defined as a first direction, and the size of the auxiliary electrode in the first direction is from away from The direction of the input terminal to approach the input terminal gradually decreases.
7. The display panel of claim 1, wherein the first electrode is a cathode, the second electrode is an anode, and the light-emitting unit further comprises a pixel defining layer, and the pixel defining layer is disposed on the first One side of an electrode away from the substrate, the pixel defining layer is provided with a through hole, the light-emitting layer is provided in the through hole and electrically connected to the first electrode, and the second electrode is provided on the The pixel defining layer and the light emitting layer are away from the substrate, the second electrode is electrically connected to the light emitting layer, and the auxiliary electrode is provided on the pixel defining layer away from the substrate.
A display panel, wherein the display panel includes a substrate, a light-emitting unit, a barrier layer, an auxiliary electrode, and a signal electrode; the light-emitting unit includes a first electrode, a light-emitting layer, and a second electrode. Compared with the light-emitting layer and the second electrode, the electrode is arranged adjacent to the substrate, the light-emitting layer is arranged on the side of the first electrode away from the substrate, and the second electrode is arranged on the light-emitting layer On the side away from the first electrode, the first electrode is loaded with a first voltage signal, the second electrode is loaded with a second voltage signal, and the first voltage signal and the second voltage signal cooperate with each other so that all The light emitting unit emits light, the barrier layer is provided on the side of the second electrode away from the light emitting layer, the auxiliary electrode is provided on the side of the barrier layer away from the second electrode, and the signal electrode is provided On the side of the auxiliary electrode away from the barrier layer, the signal electrode is electrically connected to the first electrode, the auxiliary electrode is electrically connected to the signal electrode, and the auxiliary electrode is connected in parallel to the signal electrode , Thereby achieving electrical connection between the auxiliary electrode and the first electrode.
A manufacturing method of a display panel, characterized in that, the manufacturing method includes:

Provide substrate;

Forming a first electrode on one side of the substrate;

Forming a light-emitting layer on the side of the first electrode away from the substrate;

Forming a second electrode on the side of the light-emitting layer away from the first electrode; and

An auxiliary electrode is formed on the side of the light-emitting layer away from the first electrode, and the auxiliary electrode is electrically connected with the second electrode and the auxiliary electrode is connected in parallel with the second electrode.
18. The preparation method of claim 18, wherein "forming a light emitting layer on the side of the first electrode away from the substrate" comprises:

Forming a pixel defining layer on the side of the first electrode away from the substrate;

Opening a through hole in the pixel defining layer to expose part of the first electrode; and

A light emitting layer is formed in the through hole.
A manufacturing method of a display panel, characterized in that, the manufacturing method includes:

Provide substrate;

Forming a first electrode on one side of the substrate;

Forming a light-emitting layer on the side of the first electrode away from the substrate;

Forming a second electrode on the side of the light-emitting layer away from the first electrode;

Forming a barrier layer on the side of the second electrode away from the light emitting layer;

Forming an auxiliary electrode on the side of the barrier layer away from the second electrode; and

A signal electrode is formed on the side of the auxiliary electrode away from the barrier layer, and the signal electrode is electrically connected to the first electrode and the auxiliary electrode, and the auxiliary electrode is electrically connected to the signal electrode, Thus, the auxiliary electrode is electrically connected with the first electrode and the auxiliary electrode is connected in parallel with the first electrode.