OLED display panels

Abstract

The present application provides an OLED display panel; the OLED display panel is provided with a first conductive layer and a second conductive layer. In the overlapping area, the first conductive layer is provided between the terminal and the second conductive layer, the second conductive layer is provided between the first conductive layer and the electron transport layer, and the electron injection layer is provided between the electron transport layer and the cathode layer. Therefore, the electron injection layer, the electron transport layer and the cathode layer can be formed using a single mask, thereby improving the production efficiency of the OLED display panel. At the same time, a protrusion is provided on the first conductive layer, so that the electron transport layer and the electron injection layer can be disconnected at the protrusion, and the cathode layer is brought into contact with the protrusion. Then, the cathode layer can be directly connected to the terminal through the conductive layer, thereby improving the conductivity between the cathode layer and the terminal, and enabling the OLED display panel to operate normally.

Description

Technical Field

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

[0002] With the development of display technology, in order to reduce costs, the hole injection layer, hole transport layer and light-emitting layer in the OLED (Organic Light-Emitting Diode) display device are formed by inkjet printing. However, due to the material limitations of the electron transport layer and the electron injection layer, the electron transport layer and the electron injection layer can only be formed by evaporation, and the cathode is also formed by evaporation during the formation process. Since the cathode needs to be connected to the metal wiring during formation, it is necessary to make the film forming area of ​​the cathode larger than the film forming area of ​​the electron injection layer and the electron transport layer, which will result in at least two masks and the design of multiple cavities to form cathodes and electron injection layers / electron transport layers with different film forming areas, resulting in low preparation efficiency of OLED display devices.

[0003] Therefore, the existing OLED display device has a technical problem of low production efficiency of the OLED display device due to the different masks of the cathode and the electron injection layer / electron transport layer. Summary of the Invention

[0004] An embodiment of the present application provides an OLED display panel to solve the technical problem of low production efficiency of OLED display devices caused by different masks for the cathode and the electron injection layer / electron transport layer in existing OLED display devices.

[0005] An embodiment of the present application provides an OLED display panel, the OLED display panel including a display area and a bonding area, the OLED display panel including:

[0006] substrate;

[0007] A driving circuit layer is provided on one side of the substrate, and the driving circuit layer includes terminals;

[0008] a light-emitting functional layer, disposed on a side of the driving circuit layer away from the substrate, the light-emitting functional layer comprising an electron transport layer and an electron injection layer, the electron transport layer being disposed between the driving circuit layer and the electron injection layer;

[0009] a cathode layer, disposed on a side of the electron injection layer away from the electron transport layer;

[0010] In which, the OLED display panel also includes a conductive layer, the conductive layer includes a first conductive layer and a second conductive layer, in the overlapping area, the first conductive layer is arranged between the terminal and the second conductive layer, the second conductive layer is arranged between the first conductive layer and the electron transport layer, the electron injection layer is arranged between the electron transport layer and the cathode layer, the first conductive layer includes a protrusion, the electron transport layer and the electron injection layer are disconnected at the protrusion, and the cathode layer is in contact with the protrusion.

[0011] In some embodiments, the metal mobility of the first conductive layer is greater than the metal mobility of the second conductive layer, and the oxidation rate of the first conductive layer is greater than the oxidation rate of the second conductive layer.

[0012] In some embodiments, the material of the first conductive layer includes a first metal material, the metal mobility of the first metal material is greater than the metal mobility of the material of the second conductive layer, and the oxidation rate of the first metal material is greater than the oxidation rate of the material of the second conductive layer.

[0013] In some embodiments, the material of the second conductive layer includes one of a second metal material and a metal oxide.

[0014] In some embodiments, the protrusion includes a first protrusion, the first protrusion is arranged on the side of the first conductive layer, the electron injection layer and the electron transport layer are located on the side of the first protrusion, and the cathode layer is in contact with at least the top of the first protrusion.

[0015] In some embodiments, a projection of a side of the second conductive layer in contact with the first conductive layer on the substrate coincides with a projection of a side of the first conductive layer in contact with the second conductive layer on the substrate.

[0016] In some embodiments, a projection of a side of the second conductive layer in contact with the first conductive layer on the substrate is smaller than a projection of a side of the first conductive layer in contact with the second conductive layer on the substrate.

[0017] In some embodiments, the protrusion further includes a second protrusion, which is arranged in an area where the first conductive layer exceeds the second conductive layer, the electron transport layer and the electron injection layer are located on the side of the second protrusion, and the cathode layer is in contact with at least the top of the second protrusion.

[0018] In some embodiments, the OLED display panel further includes a pixel electrode layer, wherein the pixel electrode layer includes a pixel electrode located in the display area and a first conductive layer and a second conductive layer located in the overlapping area.

[0019] In some embodiments, the conductive layer includes at least two conductive units, adjacent conductive units are spaced apart, and the protrusion on any conductive unit is spaced apart from an adjacent conductive unit.

[0020] In some embodiments, the conductive unit includes a conductive portion and a via hole, the conductive portion is arranged around the via hole, and a protrusion is formed on a side of the conductive portion close to the via hole.

[0021] In some embodiments, in the region corresponding to the via hole, the conductive unit further includes a connecting portion, and the conductive portions are connected through the connecting portion.

[0022] In some embodiments, the conductive layer also includes a third conductive layer, which is arranged between the first conductive layer and the terminal, the conductivity of the third conductive layer is greater than the conductivity of the first conductive layer, and the metal mobility of the third conductive layer is less than the metal mobility of the first conductive layer, and the oxidation rate of the third conductive layer is less than the oxidation rate of the first conductive layer.

[0023] Beneficial effects: The present application provides an OLED display panel; the OLED display panel has a display area and an overlapping area, the OLED display panel includes a substrate, a driving circuit layer, a light-emitting functional layer and a cathode layer, the driving circuit layer is arranged on one side of the substrate, the driving circuit layer includes a terminal, the light-emitting functional layer is arranged on a side of the driving circuit layer away from the substrate, the light-emitting functional layer includes an electron transport layer and an electron injection layer, the electron transport layer is arranged between the driving circuit layer and the electron injection layer, and the cathode layer is arranged on a side of the electron injection layer away from the electron transport layer, wherein the OLED display panel also includes a conductive layer, the conductive layer includes a first conductive layer and a second conductive layer, in the overlapping area, the first conductive layer is arranged between the terminal and the second conductive layer, the second conductive layer is arranged between the first conductive layer and the electron transport layer, the electron injection layer is arranged between the electron transport layer and the cathode layer, the first conductive layer includes a protrusion, the electron transport layer and the electron injection layer are disconnected at the protrusion, and the cathode layer is in contact with the protrusion. In the present application, a first conductive layer and a second conductive layer are provided. In the overlapping area, the first conductive layer is provided between the terminal and the second conductive layer, the second conductive layer is provided between the first conductive layer and the electron transport layer, and the electron injection layer is provided between the electron transport layer and the cathode layer. Then, one mask can be used to form the electron injection layer, the electron transport layer and the cathode layer, thereby improving the preparation efficiency of the OLED display panel. At the same time, a protrusion is provided on the first conductive layer, so that the electron transport layer and the electron injection layer can be disconnected at the protrusion, and the cathode layer is in contact with the protrusion. Then, the cathode layer can be directly connected to the terminal through the conductive layer, thereby improving the conductivity between the cathode layer and the terminal, and enabling the OLED display panel to operate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0025] Figure 1 A first schematic diagram of an OLED display panel provided in an embodiment of the present application;

[0026] Figure 2 A second schematic diagram of an OLED display panel provided in an embodiment of the present application;

[0027] Figure 3 A third schematic diagram of an OLED display panel provided in an embodiment of the present application;

[0028] Figure 4 A fourth schematic diagram of an OLED display panel provided in an embodiment of the present application;

[0029] Figure 5 for Figure 4 A1-A2 cross-sectional view;

[0030] Figure 6 A fifth schematic diagram of an OLED display panel provided in an embodiment of the present application;

[0031] Figure 7 A sixth schematic diagram of an OLED display panel provided in an embodiment of the present application;

[0032] Figure 8 A seventh schematic diagram of an OLED display panel provided in an embodiment of the present application;

[0033] Figure 9 This is a comparison chart between an existing OLED display panel and an OLED display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0035] The embodiments of the present application address the technical problem of low production efficiency of OLED display devices due to different masks for the cathode and electron injection layer / electron transport layer in existing OLED display devices, and provide an OLED display panel to solve the above technical problem.

[0036] like Figure 1 、 Figure 2As shown, an embodiment of the present application provides an OLED display panel. The OLED display panel 1 includes a display area 181 and a bonding area 182. The OLED display panel 1 includes:

[0037] substrate 11;

[0038] A driving circuit layer 12 is provided on one side of the substrate 11, and the driving circuit layer 12 includes a terminal 127a;

[0039] a light-emitting functional layer 15 disposed on a side of the driving circuit layer 12 away from the substrate 11 , the light-emitting functional layer 15 comprising an electron transport layer 154 and an electron injection layer 155 , wherein the electron transport layer 154 is disposed between the driving circuit layer 12 and the electron injection layer 155 ;

[0040] The cathode layer 16 is disposed on a side of the electron injection layer 155 away from the electron transport layer 154;

[0041] In which, the OLED display panel 1 also includes a conductive layer 13, and the conductive layer 13 includes a first conductive layer 131 and a second conductive layer 132. In the overlapping area 182, the first conductive layer 131 is arranged between the terminal 127a and the second conductive layer 132, the second conductive layer 132 is arranged between the first conductive layer 131 and the electron transport layer 154, and the electron injection layer 155 is arranged between the electron transport layer 154 and the cathode layer 16. The first conductive layer 131 includes a protrusion 131a, the electron transport layer 154 and the electron injection layer 155 are disconnected at the protrusion 131a, and the cathode layer 16 is in contact with the protrusion 131a.

[0042] An embodiment of the present application provides an OLED display panel, which is provided with a first conductive layer and a second conductive layer. In the overlapping area, the first conductive layer is provided between the terminal and the second conductive layer, the second conductive layer is provided between the first conductive layer and the electron transport layer, and the electron injection layer is provided between the electron transport layer and the cathode layer. Then, a single mask can be used to form the electron injection layer, the electron transport layer, and the cathode layer, thereby improving the preparation efficiency of the OLED display panel. At the same time, a protrusion is provided on the first conductive layer, so that the electron transport layer and the electron injection layer can be disconnected at the protrusion, and the cathode layer is brought into contact with the protrusion. Then, the cathode layer can be directly connected to the terminal through the conductive layer, thereby improving the conductivity between the cathode layer and the terminal, and enabling the OLED display panel to operate normally.

[0043] In one embodiment, the metal mobility of the first conductive layer is greater than the metal mobility of the second conductive layer, and the oxidation rate of the first conductive layer is greater than the oxidation rate of the second conductive layer. By making the metal mobility of the first conductive layer greater than the metal mobility of the second conductive layer, and the oxidation rate of the first conductive layer greater than the oxidation rate of the second conductive layer, the first conductive layer can automatically form a protrusion through metal migration and / or oxidation, so that the electron transport layer and the electron injection layer can be disconnected at the protrusion, allowing the cathode layer to contact the protrusion, and the cathode layer can be directly connected to the terminal through the conductive layer, thereby improving the conductivity between the cathode layer and the terminal and enabling the OLED display panel to operate normally.

[0044] It should be noted that the metal mobility of the first conductive layer is greater than the metal mobility of the second conductive layer, and the oxidation rate of the first conductive layer is greater than the oxidation rate of the second conductive layer, which means that the stability of the first conductive layer is lower than that of the second conductive layer, that is, during the preparation process of the first conductive layer and the second conductive layer, the first conductive layer is more likely to undergo metal migration, forming dendritic protrusions or fibrous burrs on the structure of the first conductive layer, and the first conductive layer is more likely to undergo oxidation, that is, forming expansion-type protrusions on the first conductive layer. The protrusions described in the embodiments of the present application include the above-mentioned dendritic protrusions, fibrous burrs and expansion-type protrusions, and are not limited thereto. The protrusions on the first conductive layer are all protrusions described in the embodiments of the present application. The second conductive layer is not prone to metal migration and is not easily oxidized, so the effect of conducting the cathode layer and the first conductive layer is better, and the second conductive layer can protect the first conductive layer, preventing the first conductive layer from being completely oxidized and / or the conductivity from being reduced after metal migration, so that the conductive layer can better conduct the cathode layer and the terminal.

[0045] It should be noted that when metal migration and / or oxidation occurs in the first conductive layer, the protrusions of the first conductive layer are not completely oxidized, but the structure of the first conductive layer becomes fluffy, and the overall structure is a mixture of metal and metal oxide, which is conductive. Therefore, the cathode layer can be in contact with the protrusions and conduct electricity.

[0046] Specifically, such as Figure 1As shown, it can be seen that the electron transport layer 154, the electron injection layer 155 and the cathode layer 16 are all arranged in the display area 181 and the overlapping area 182. When preparing the OLED display panel, the same metal mask can be used to form the electron transport layer, the electron injection layer and the cathode layer, thereby improving the preparation efficiency and reducing the cost of the OLED display panel. However, for the existing display device, since the electron transport layer and the electron injection layer are arranged in the overlapping area, an electron transport layer and an electron injection layer will be provided between the cathode layer and the terminal. The electron transport layer and the electron injection layer have poor conductivity, which may cause the cathode layer and the terminal to have poor conduction effect (for example, the impedance is too large, resulting in insufficient voltage, the cathode layer and the terminal are disconnected and connected at irregular intervals), or even the cathode layer and the terminal cannot be connected. Therefore, the existing display device can only use two different masks, one for forming the electron transport layer and the electron injection layer, and the other for forming the cathode layer, so that the electron transport layer and the electron injection layer are not arranged in the overlapping area, which will result in low preparation efficiency and high cost of the display device, that is, the existing display device cannot take into account the conductivity and preparation efficiency of the cathode layer and the terminal.

[0047] Specifically, such as Figure 1 、 Figure 2 As shown, the present application sets a conductive layer 13 between the electron transport layer 154 and the terminal 127a, so that the metal mobility of the first conductive layer 131 is greater than the metal mobility of the second conductive layer 132, and the oxidation rate of the first conductive layer 131 is greater than the oxidation rate of the second conductive layer 132. Then, when preparing the first conductive layer and the second conductive layer, the first conductive layer can automatically form a protrusion, and the electron transport layer and the electron injection layer are disconnected by the protrusion, so that the cathode layer can contact the protrusion, so that the cathode layer is directly connected to the terminal through the conductive layer, avoiding the electron transport layer and the electron injection layer from being unable to conduct electricity between the cathode layer and the terminal, and the conductive layer can reduce the impedance of the terminal and the cathode layer, improve the conductivity of the cathode layer and the terminal, thereby taking into account the conductivity and preparation efficiency of the cathode layer and the terminal.

[0048] Specifically, compared with the technical solution of using a bottom cut structure to disconnect the electron transport layer and the electron injection layer, the embodiment of the present application adopts the structure and material design of the first conductive layer and the second conductive layer, so that the first conductive layer can automatically form a protrusion during the preparation process without the need for additional process flow, reducing the process steps, avoiding affecting the performance of the thin film transistor, and improving the performance of the thin film transistor.

[0049] Specifically, from Figure 2 As can be seen, the protrusion 131a includes various forms. The specific shape of the protrusion 131a is not limited in the embodiment of the present application. The form of the protrusion formed in the actual preparation process shall prevail. Any structure protruding on the first conductive layer belongs to the protrusion in the embodiment of the present application and will not be repeated here.

[0050] In one embodiment, the material of the first conductive layer includes a first metal material, the metal mobility of the first metal material is greater than the metal mobility of the material of the second conductive layer, and the oxidation rate of the first metal material is greater than the oxidation rate of the material of the second conductive layer. By making the material of the first conductive layer the first metal material, metal migration and / or oxidation will occur in the first conductive layer during the preparation process, generating protrusions in a mixed state of metal oxide and metal. The protrusions disconnect the electron transport layer and the electron injection layer, allowing the cathode layer to be directly connected to the terminal through the conductive layer, thereby achieving normal conduction between the cathode layer and the terminal. The second conductive layer can also protect the first conductive layer from complete oxidation.

[0051] Specifically, the first metal material includes one of silver, copper, and aluminum. Using such a material as the material for the first conductive layer allows metal migration and / or oxidation to occur during the manufacturing process, forming a protrusion in the first conductive layer, disconnecting the electron transport layer and the electron injection layer and connecting the cathode layer.

[0052] In one embodiment, the material of the second conductive layer includes one of a second metal material and a metal oxide. Forming the second conductive layer using one of the second metal material and the metal oxide provides the second conductive layer with good electrical conductivity, protects the first conductive layer, and improves the conductivity between the cathode layer and the terminal.

[0053] Specifically, the second metal material includes one of molybdenum and titanium, and the metal oxide includes one of indium tin oxide and indium zinc oxide. By using these materials as the second conductive layer, the second conductive layer can protect the first conductive layer during the manufacturing process, preventing complete oxidation of the first conductive layer. The second conductive layer can also improve the conductivity of the first conductive layer, thereby improving the conductive effect between the cathode layer and the terminal.

[0054] In one embodiment, if Figure 3 As shown, the protrusion 131a includes a first protrusion 231, which is provided on the side of the first conductive layer 131. The electron transport layer 154 and the electron injection layer 155 are located on the side of the first protrusion 231, and the cathode layer 16 is in contact with at least the top of the first protrusion 231. By forming the first protrusion on the side of the first conductive layer, the electron transport layer and the electron injection layer are broken at the first protrusion. When the cathode layer is subsequently prepared, the cathode layer can contact the first protrusion. The cathode layer is connected to the first conductive layer and the second conductive layer through the first protrusion, and is connected to the terminal through the conductive layer, thereby achieving the connection between the cathode layer and the terminal, taking into account the conductive performance and preparation efficiency of the cathode layer and the terminal.

[0055] Specifically, such as Figure 3As shown, it can be seen that the first protrusion 231 is located on the side of the first conductive layer 131. During the preparation of the electron transport layer and the electron injection layer, due to the influence of gravity, when the first protrusion is present, the electron transport layer and the electron injection layer are more likely to break on the side of the first conductive layer, so that the first protrusion can disconnect the electron transport layer and the electron injection layer, and the cathode layer can contact the protruding top of the first protrusion, thereby realizing the electrical connection between the cathode layer and the conductive layer, thereby realizing the connection between the cathode layer and the terminal.

[0056] Specifically, the first protrusion can be arranged around the first conductive layer. By arranging the first protrusion around the first conductive layer, the possibility of fracture of the electron transport layer and the electron injection layer can be increased, and the cathode layer and the first conductive layer have more contact positions, for example, the cathode layer contacts the side of the first conductive layer, which can improve the conduction effect of the cathode layer and the first conductive layer.

[0057] The first conductive layer is prone to metal migration and oxidation, which may cause the terminal and cathode layer to be unable to conduct. Figure 2 As shown, the projection of the side of the second conductive layer 132 in contact with the first conductive layer 131 on the substrate overlaps with the projection of the side of the first conductive layer 131 in contact with the second conductive layer 132 on the substrate. By aligning the projection of the side of the second conductive layer in contact with the first conductive layer on the substrate with the projection of the side of the first conductive layer in contact with the first conductive layer on the substrate, the second conductive layer can protect the upper surface of the first conductive layer, preventing the first conductive layer from being completely oxidized, which would degrade the conductivity of the first conductive layer and prevent it from being able to conduct electricity between the cathode layer and the terminal. The second conductive layer is connected to the first conductive layer, which can improve the conductivity of the conductive layer and reduce the impedance of the cathode layer and the terminal.

[0058] Specifically, from Figure 2 As can be seen in FIG, due to the presence of the protrusions, the widths of various parts of the first conductive layer 131 are different, and Figure 2 The figure shows that the width of the second conductive layer remains unchanged. However, in actual design, due to process limitations, the shape of the second conductive layer is trapezoidal. Therefore, when the second conductive layer is used to protect the first conductive layer, the width of the side of the second conductive layer in contact with the first conductive layer is equal to the width of the side of the first conductive layer in contact with the second conductive layer. This can prevent oxidation of the upper surface of the first conductive layer, which may cause the conductivity of the first conductive layer to deteriorate.

[0059] In one embodiment, if Figure 3As shown, the projection of the side of the second conductive layer 132 in contact with the first conductive layer 131 on the substrate is smaller than the projection of the side of the first conductive layer 131 in contact with the second conductive layer 132 on the substrate. By making the width of the side of the second conductive layer in contact with the first conductive layer smaller than the width of the side of the first conductive layer in contact with the second conductive layer, the exposed portion of the first conductive layer is increased, thereby forming more protrusions, increasing the number of breaks between the electron transport layer and the electron injection layer, and improving the connection between the cathode layer and the first conductive layer.

[0060] The problem that the fewer protrusions on the first conductive layer will result in fewer breaks in the electron transport layer and the electron injection layer, and poor conduction between the cathode layer and the first conductive layer. Figure 3 As shown, the protrusion 131a also includes a second protrusion 232, which is arranged in the area where the first conductive layer 131 exceeds the second conductive layer 132, the electron transport layer 154 and the electron injection layer 155 are located on the side of the second protrusion 232, and the cathode layer 16 is in contact with at least the top of the second protrusion 232. By making the width of the first conductive layer on the side in contact with the second conductive layer greater than the width of the second conductive layer on the side in contact with the first conductive layer, the first conductive layer can also be exposed on the upper surface, so that a second protrusion can be formed on the upper surface of the first conductive layer, the electron transport layer and the electron injection layer are broken at the second protrusion, the electron transport layer and the electron injection layer are arranged on both sides of the second protrusion, and the cathode layer can be in contact with the top of the second protrusion, thereby increasing the number of contact points between the cathode layer and the first conductive layer, improving the conductive effect between the cathode layer and the conductive layer, and further improving the conductive effect between the cathode layer and the terminal.

[0061] Specifically, such as Figure 3 As shown, it can be seen that in the area where the first conductive layer 131 exceeds the second conductive layer 132, the first conductive layer 131 is formed with a second protrusion 232, and the electron transport layer 154 and the electron injection layer 155 will be broken at the second protrusion. During the preparation process of the electron transport layer 154 and the electron injection layer 155, the electron transport layer 154 and the electron injection layer 155 will be pierced by the protrusion, so that the first conductive layer 131 can be connected to the cathode layer 16 through the second protrusion 232, thereby increasing the number of contact points between the cathode layer and the first conductive layer, improving the conduction effect between the cathode layer and the conductive layer, and thereby improving the conduction effect between the cathode layer and the terminal.

[0062] The above embodiments are described in detail using the example of a protrusion located on the side of the first conductive layer, or the protrusion including a first protrusion located on the side of the first conductive layer and a second protrusion located on the top surface of the first conductive layer. However, the embodiments of the present application are not limited thereto. For example, the second conductive layer may wrap around the side of the first conductive layer, leaving the top surface of the first conductive layer exposed, with the protrusion located on the top surface of the first conductive layer, thereby disconnecting the electron transport layer and the electron injection layer, and connecting the first conductive layer to the cathode layer.

[0063] In order to solve the problem that the formation of the first conductive layer and the second conductive layer during the preparation process of the OLED display panel will lead to low preparation efficiency and increased thickness of the OLED display panel, in one embodiment, Figure 1 、 Figure 2 As shown, the OLED display panel 1 further includes a pixel electrode layer 14, which includes a pixel electrode 141 located in the display area 181, and a first conductive layer 131 and a second conductive layer 132 located in the overlapping area 182. By making the pixel electrode layer include the pixel electrode, the first conductive layer, and the second conductive layer, the first conductive layer and the second conductive layer can be formed simultaneously when forming the pixel electrode, thereby avoiding increasing the thickness of the OLED display panel, reducing the process flow of the OLED display panel, and improving the production efficiency of the OLED display panel.

[0064] Specifically, when setting the pixel electrode layer, the pixel electrode layer can be designed as a first pixel electrode layer and a second pixel electrode layer, and the metal mobility of the first pixel electrode layer close to the source and drain layer is greater than the metal mobility of the second pixel electrode layer close to the cathode layer, and the oxidation rate of the first pixel electrode layer is greater than the oxidation rate of the second pixel electrode layer. Then, the first conductive layer can be formed by the first pixel electrode layer, and the second conductive layer can be formed by the second pixel electrode layer, thereby avoiding increasing the thickness of the OLED display panel, reducing the process flow of the OLED display panel, and improving the preparation efficiency of the OLED display panel.

[0065] Specifically, for example, the material of the first pixel electrode layer includes silver, and the material of the second pixel electrode layer includes indium tin oxide. The first pixel electrode layer can be used to form a first conductive layer, and the second pixel electrode layer can be used to form a second conductive layer. The first conductive layer can form a protrusion to disconnect the electron transport layer and the electron injection layer, connect the cathode layer, and achieve conduction between the cathode layer and the terminal.

[0066] In one embodiment, if Figure 2As shown, the conductive layer 13 includes at least two conductive units 133, with adjacent conductive units 133 spaced apart, and the protrusion 131a on any conductive unit 133 is spaced apart from adjacent conductive units 133. By providing multiple conductive units in the conductive layer, each conductive unit is formed with a protrusion, and the number of protrusions is increased, more locations are created where the electron transport layer and the electron injection layer are disconnected, and the number of contact points between the cathode layer and the first conductive layer is increased, thereby improving the conduction effect between the cathode layer and the conductive layer, and further improving the conduction effect between the cathode layer and the terminal.

[0067] Specifically, in order to avoid the influence of adjacent conductive units, a certain distance needs to be left between adjacent conductive units. Therefore, the distance between adjacent conductive units can be set to 10 micrometers.

[0068] Even with multiple conductive units, there is still a problem that the number of contact points between the cathode layer and the first conductive layer is small. Figure 4 、 Figure 5 As shown, the conductive unit 133 includes a conductive portion 133a and a via 133b. The conductive portion 133a is arranged around the via 133b. The conductive unit 133 has a protrusion 131a formed on the side of the conductive portion 133a near the via 133b. By making the conductive unit include a conductive portion and a via, and the conductive portion being arranged around the via, the conductive portion can form a protrusion on the side near the via, and the conductive unit can form a protrusion on the side, that is, the conductive portion can form a protrusion on the side away from the via. This allows protrusions to be formed on both the outside and inside of the conductive portion, increasing the number of contact points between the cathode layer and the first conductive layer, improving the conductive effect between the cathode layer and the conductive layer, and thus improving the conductive effect between the cathode layer and the terminal.

[0069] Specifically, Figure 4 A perspective view of an OLED display panel. Figure 4 Only the film layer and the conductive layer where the terminal 127a is located are shown in the figure. Therefore, in the perspective view, the terminal can be seen in the via hole of the conductive layer. Figure 4 As can be seen in the figure, in the overlapping hole 31, the conductive unit 133 forms a conductive portion 133a and a via 133b. Figure 5 for Figure 4 In the A1-A2 section, Figure 5 The terminal 127a, the conductive layer 13, the electron transport layer 154, the electron injection layer 155 and the cathode layer 16 are shown. Figure 5 It can be seen that the conductive part 133a has a protrusion 131a formed on the side close to the via hole 133b, and the conductive part 133a has a protrusion formed on the side away from the via hole 133b, thereby increasing the number of contact points between the cathode layer and the first conductive layer, improving the conduction effect between the cathode layer and the conductive layer, and further improving the conduction effect between the cathode layer and the terminal.

[0070] In one embodiment, if Figure 6 As shown, in the area corresponding to the via 133b, the conductive unit 133 further includes a connecting portion 133c, through which the conductive portion 133a is connected. When the conductive unit is provided, a via is formed in the conductive unit, but the via is controlled not to penetrate the conductive unit, so that the conductive portion is connected through the connecting portion, thereby improving contact between the conductive unit and the terminal and enhancing the conductive effect between the conductive unit and the terminal.

[0071] In one embodiment, the material of the terminal includes metal.

[0072] In one embodiment, the cross-sectional shape of the via hole includes at least one of a circle, a square, a diamond, and a strip.

[0073] In one embodiment, if Figure 7 As shown, the cross-sectional shape of the conductive unit 133 includes at least one of a circle, a square, a diamond, and a strip.

[0074] Specifically, Figure 7 (a) shows a conductive unit with a circular cross-sectional shape, Figure 7 (b) in FIG. 4 shows a conductive unit having a square cross-sectional shape. Figure 7 (c) in FIG. 4 shows a conductive unit having a diamond-shaped cross-section. Figure 7 (d) in FIG. 4 shows a conductive unit having a triangular cross-sectional shape. Figure 7 (e) in the figure shows a conductive unit having a bar-shaped cross section, and the embodiments of the present application are not limited thereto. For example, the conductive unit may include a bar-shaped and a circular shape.

[0075] In one embodiment, if Figure 1 、 Figure 8 As shown, the conductive layer 13 further includes a third conductive layer 134, which is disposed between the first conductive layer 131 and the terminal 127a. The conductivity of the third conductive layer 134 is greater than that of the first conductive layer 131, and the metal mobility of the third conductive layer 134 is less than that of the first conductive layer 131. The oxidation rate of the third conductive layer 134 is less than that of the first conductive layer 131. By disposing the third conductive layer between the first conductive layer and the terminal, the conductivity of the third conductive layer is greater than that of the first conductive layer, the metal mobility of the third conductive layer is less than that of the first conductive layer, and the oxidation rate of the third conductive layer is less than that of the first conductive layer. This can improve the conductive performance of the conductive layer and enhance the conduction effect between the cathode layer and the terminal.

[0076] Specifically, the above embodiment is described by taking the example of the third conductive layer being arranged between the terminal and the first conductive layer, but the embodiments of the present application are not limited to this. For example, the third conductive layer is arranged between the second conductive layer and the cathode layer, which is not repeated here.

[0077] In one embodiment, if Figure 1 As shown, the driving circuit layer 12 further includes a light shielding layer 121 , a buffer layer 122 , an active layer 123 , a gate insulating layer 124 , a gate layer 125 , an interlayer insulating layer 126 , a source and drain electrode layer 127 , a passivation layer 128 and a planarization layer 129 .

[0078] Specifically, in Figure 1 In the figure, the source-drain layer 127 is used as an example to form the terminal 127a, but the embodiments of the present application are not limited thereto. For example, other metal film layers or additional metal film layers can be used to form the terminal, which will not be repeated here.

[0079] In one embodiment, if Figure 1 As shown, the light-emitting functional layer 15 further includes a hole injection layer 151 , a hole transport layer 152 and a light-emitting material layer 153 .

[0080] In one embodiment, if Figure 1 As shown, the OLED display panel 1 further includes an encapsulation layer 17 .

[0081] At the same time, an embodiment of the present application provides a method for preparing an OLED display panel, wherein the method for preparing an OLED display panel is used to prepare the OLED display panel described in any of the above embodiments, and the method for preparing an OLED display panel comprises:

[0082] providing a substrate;

[0083] forming a driving circuit layer on a substrate; the driving circuit layer including terminals;

[0084] forming a pixel electrode layer and a pixel electrode layer on the driving circuit layer, and etching the pixel definition layer to form a via hole in the overlapping area of ​​the pixel definition layer;

[0085] forming a hole injection layer, a hole transport layer and a light-emitting material layer on the pixel electrode layer by inkjet printing;

[0086] A conductive layer is formed in the via hole of the overlapping region; the conductive layer includes at least a first conductive layer and a second conductive layer, the first conductive layer is disposed between the terminal and the second conductive layer, the metal mobility of the first conductive layer is greater than the metal mobility of the second conductive layer, the oxidation rate of the first conductive layer is greater than the oxidation rate of the second conductive layer, and the first conductive layer includes a protrusion;

[0087] forming an electron transport layer and an electron injection layer on the light emitting material layer so that the electron transport layer and the electron injection layer are disconnected at the protrusion;

[0088] A cathode layer is formed on the electron transport layer and the electron injection layer using the same mask so that the cathode layer contacts the protrusions, thereby obtaining an OLED display panel.

[0089] like Figure 9 As shown, Figure 9 (a) is the design of the film forming area of ​​the existing OLED display panel. Figure 9 As can be seen from (a), within the boundary 401 of the display panel, since the electron transport layer and the electron injection layer cannot conduct the cathode layer and the terminal, the film forming area of ​​the electron transport layer and the electron injection layer needs to be smaller than the film forming area of ​​the cathode layer, and the boundary 412 of the electron transport layer and the electron injection layer is located below the boundary 411 of the cathode layer. Then, the boundary of the first mask for forming the electron transport layer and the electron injection layer is different from the boundary of the second mask for forming the cathode layer. Only in this way can the electron transport layer and the electron injection layer be close to the boundary 413 of the display area without covering the overlapping area 414. Therefore, the existing OLED display device needs to use different masks to form the cathode and the electron transport layer and the electron injection layer.

[0090] like Figure 9 As shown in (b), the present application forms an electron transport layer, an electron injection layer and a cathode layer by using one mask. Within the boundary 402 of the OLED display panel, when the boundary 422 of the display area and the boundary 423 of the overlapping area are not changed, there is only one boundary of the mask. The boundaries of the electron transport layer and the electron injection layer basically coincide with or even coincide with the boundary 421 of the cathode layer, and the cathode layer and the terminal are connected by the conductive layer in the above embodiment, so that the electron transport layer, the electron injection layer and the cathode layer are formed by the same mask, thereby improving the preparation efficiency of the OLED display panel and reducing the cost. Moreover, since there is no need to control the spacing between the electron transport layer, the electron injection layer and the cathode layer, the frame can be reduced to achieve a narrow frame of the OLED display panel.

[0091] At the same time, an embodiment of the present application provides an OLED display device, which includes a driver chip and an OLED display panel as described in any of the above embodiments.

[0092] According to the above embodiments, it can be seen that:

[0093] An embodiment of the present application provides an OLED display panel; the OLED display panel has a display area and an overlapping area, the OLED display panel includes a substrate, a driving circuit layer, a light-emitting functional layer and a cathode layer, the driving circuit layer is arranged on one side of the substrate, the driving circuit layer includes a terminal, the light-emitting functional layer is arranged on a side of the driving circuit layer away from the substrate, the light-emitting functional layer includes an electron transport layer and an electron injection layer, the electron transport layer is arranged between the driving circuit layer and the electron injection layer, and the cathode layer is arranged on a side of the electron injection layer away from the electron transport layer, wherein the OLED display panel also includes a conductive layer, the conductive layer includes a first conductive layer and a second conductive layer, in the overlapping area, the first conductive layer is arranged between the terminal and the second conductive layer, the second conductive layer is arranged between the first conductive layer and the electron transport layer, the electron injection layer is arranged between the electron transport layer and the cathode layer, the first conductive layer includes a protrusion, the electron transport layer and the electron injection layer are disconnected at the protrusion, and the cathode layer is in contact with the protrusion. In the present application, a first conductive layer and a second conductive layer are provided. In the overlapping area, the first conductive layer is provided between the terminal and the second conductive layer, the second conductive layer is provided between the first conductive layer and the electron transport layer, and the electron injection layer is provided between the electron transport layer and the cathode layer. Then, one mask can be used to form the electron injection layer, the electron transport layer and the cathode layer, thereby improving the preparation efficiency of the OLED display panel. At the same time, a protrusion is provided on the first conductive layer, so that the electron transport layer and the electron injection layer can be disconnected at the protrusion, and the cathode layer is in contact with the protrusion. Then, the cathode layer can be directly connected to the terminal through the conductive layer, thereby improving the conductivity between the cathode layer and the terminal, and enabling the OLED display panel to operate normally.

[0094] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0095] The above is a detailed introduction to an OLED display panel provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An OLED display panel, comprising a display area and a bonding area, characterized in that: include: substrate; A driving circuit layer is provided on one side of the substrate, and the driving circuit layer includes terminals; a light-emitting functional layer, disposed on a side of the driving circuit layer away from the substrate, the light-emitting functional layer comprising an electron transport layer and an electron injection layer, the electron transport layer being disposed between the driving circuit layer and the electron injection layer; a cathode layer, disposed on a side of the electron injection layer away from the electron transport layer; The OLED display panel further includes a conductive layer, the conductive layer including a first conductive layer and a second conductive layer. In the overlapping region, the first conductive layer is disposed between the terminal and the second conductive layer, the second conductive layer is disposed between the first conductive layer and the electron transport layer, and the electron injection layer is disposed between the electron transport layer and the cathode layer. The first conductive layer includes a protrusion, the electron transport layer and the electron injection layer are disconnected at the protrusion, and the cathode layer contacts the protrusion. The metal mobility of the first conductive layer is greater than the metal mobility of the second conductive layer, and the oxidation rate of the first conductive layer is greater than the oxidation rate of the second conductive layer.

2. The OLED display panel according to claim 1, wherein: The material of the first conductive layer includes a first metal material, the metal mobility of the first metal material is greater than the metal mobility of the material of the second conductive layer, and the oxidation rate of the first metal material is greater than the oxidation rate of the material of the second conductive layer.

3. The OLED display panel according to claim 2, wherein: The material of the second conductive layer includes one of a second metal material and a metal oxide.

4. The OLED display panel according to claim 2, wherein: The protrusions include a first protrusion, which is arranged on a side of the first conductive layer. The electron injection layer and the electron transport layer are located on the side of the first protrusion, and the cathode layer is in contact with at least a top of the first protrusion.

5. The OLED display panel according to claim 4, wherein: A projection of a side of the second conductive layer in contact with the first conductive layer on the substrate coincides with a projection of a side of the first conductive layer in contact with the second conductive layer on the substrate.

6. The OLED display panel according to claim 4, wherein: A projection of a side of the second conductive layer in contact with the first conductive layer on the substrate is smaller than a projection of a side of the first conductive layer in contact with the second conductive layer on the substrate.

7. The OLED display panel according to claim 6, wherein: The protrusion further includes a second protrusion, which is arranged in a region where the first conductive layer exceeds the second conductive layer. The electron transport layer and the electron injection layer are located on sides of the second protrusion, and the cathode layer is in contact with at least the top of the second protrusion.

8. The OLED display panel according to claim 1, wherein: The OLED display panel further includes a pixel electrode layer, which includes a pixel electrode located in the display area and a first conductive layer and a second conductive layer located in the overlapping area.

9. The OLED display panel according to claim 1, wherein: The conductive layer includes at least two conductive units, adjacent conductive units are arranged at intervals, and the protrusion on any conductive unit is spaced apart from the adjacent conductive unit.

10. The OLED display panel according to claim 9, wherein: The conductive unit includes a conductive portion and a via hole. The conductive portion is arranged around the via hole. A protrusion is formed on one side of the conductive portion close to the via hole.

11. The OLED display panel according to claim 10, wherein: In a region corresponding to the via hole, the conductive unit further includes a connecting portion, and the conductive portions are connected through the connecting portion.

12. The OLED display panel according to claim 1, wherein: The conductive layer also includes a third conductive layer, which is arranged between the first conductive layer and the terminal. The conductivity of the third conductive layer is greater than the conductivity of the first conductive layer, and the metal mobility of the third conductive layer is less than the metal mobility of the first conductive layer. The oxidation rate of the third conductive layer is less than the oxidation rate of the first conductive layer.

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