OLED display panel and OLED display device

Abstract

The present application provides an OLED display panel and an OLED display device; the OLED display panel enables an electron injection layer and an electron transport layer to be arranged in an overlapped area, and a metal mask can be used to form the electron injection layer, the electron transport layer and the common electrode layer, thereby improving the preparation efficiency of the OLED display panel and reducing the cost; at the same time, a first metal terminal and a second metal terminal are respectively connected through a high potential voltage end and a low potential voltage end, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the conduction voltage of the metal terminal and the common electrode layer, so that even if the conductivity of the electron injection layer and the electron transport layer is poor, under the action of voltage, the electron injection layer and the electron transport layer can be burned through or through electron migration to achieve conduction between the common electrode layer and the metal terminal, so that the OLED display panel can work normally.

Description

Technical Field

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

[0002] With the development of display technology, in order to reduce costs, inkjet printing is used to form the hole injection layer, hole transport layer and light-emitting layer in OLED (Organic Light-Emitting Diode) display devices. 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 on the transistor 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 multiple cavities being designed 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 preparation 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] The embodiments of the present application provide an OLED display panel and an OLED display device, which are used to alleviate the technical problem of low manufacturing efficiency of OLED display devices caused by different masks of cathode and 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 comprising:

[0006] substrate;

[0007] A driving circuit layer is arranged on one side of the substrate, the driving circuit layer comprises metal terminals, the metal terminals comprise a first metal terminal and a second metal terminal, the first metal terminal is insulated from the second metal terminal;

[0008] A light-emitting functional layer is arranged on a side of the driving circuit layer away from the substrate, and the light-emitting functional layer includes an electron injection layer, an electron transport layer and a common electrode layer;

[0009] An encapsulation layer is arranged on a side of the light-emitting functional layer away from the driving circuit layer;

[0010] Among them, the OLED display panel includes a display area and an overlapping area, in the overlapping area, an electron injection layer and an electron transport layer are provided between the common electrode layer and the metal terminal, one side of the first metal terminal is connected to a high potential voltage end, and the other side of the first metal terminal is connected to the electron transport layer, one side of the second metal terminal is connected to the electron transport layer, and the other side of the second metal terminal is connected to a low potential voltage end, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the conduction voltage of the metal terminal and the common electrode layer.

[0011] In some embodiments, the first metal terminal and the second metal terminal are respectively disposed in overlapping areas on both sides of the display area.

[0012] In some embodiments, the first metal terminal includes a plurality of positive connection terminals, and the second metal terminal includes a plurality of negative connection terminals, the positive connection terminals are arranged in overlapping areas on both sides of the display area, the negative connection terminals are arranged in overlapping areas on both sides of the display area, and the positive connection terminals are arranged corresponding to the negative connection terminals.

[0013] In some embodiments, the positive connection terminal includes a first positive connection terminal and a second positive connection terminal, and the negative connection terminal includes a first negative connection terminal and a second negative connection terminal, the first positive connection terminal and the first negative connection terminal are arranged in the overlapping area on one side of the display area, the second positive connection terminal and the second negative connection terminal are arranged in the overlapping area on the other side of the display area, and the first positive connection terminal is electrically connected to the first negative connection terminal, and the second positive connection terminal is electrically connected to the second negative connection terminal.

[0014] In some embodiments, the positive connection terminal includes a third positive connection terminal and a fourth positive connection terminal, and the negative connection terminal includes a third negative connection terminal and a fourth negative connection terminal. The third positive connection terminal and the fourth positive connection terminal are arranged in a terminal area on one side of the display area, and the third negative connection terminal and the fourth negative connection terminal are arranged in a terminal area on the other side of the display area, and the third positive connection terminal is electrically connected to the third negative connection terminal, and the fourth positive connection terminal is electrically connected to the fourth negative connection terminal.

[0015] In some embodiments, the material of the electron injection layer includes organic material, the material of the electron transport layer includes organic material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the turn-on voltage of the electron injection layer and the electron transport layer.

[0016] In some embodiments, when voltage is input to the high potential voltage terminal and the low potential voltage terminal, the temperature of the bonding area ranges from 50 degrees Celsius to 120 degrees Celsius.

[0017] In some embodiments, the material of the common electrode layer includes a metal material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than a first migration voltage of the metal material.

[0018] In some embodiments, the material of the electron injection layer includes a first conductive material, the material of the electron transport layer includes an organic material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the second migration voltage of the electron injection layer.

[0019] In some embodiments, the electron transport layer is doped with a second conductive material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than a third migration voltage of the second conductive material.

[0020] In some embodiments, the material of the electron injection layer includes an organic material, the material of the electron transport layer includes an organic material, at least one of the electron injection layer and the electron transport layer is doped with a third conductive material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than a fourth migration voltage of the third conductive material.

[0021] At the same time, an embodiment of the present application provides an OLED display device, which includes an OLED display panel and a power supply, wherein the OLED display panel includes:

[0022] substrate;

[0023] A driving circuit layer is arranged on one side of the substrate, the driving circuit layer comprises metal terminals, the metal terminals comprise a first metal terminal and a second metal terminal, the first metal terminal is insulated from the second metal terminal;

[0024] A light-emitting functional layer is arranged on a side of the driving circuit layer away from the substrate, and the light-emitting functional layer includes an electron injection layer, an electron transport layer and a common electrode layer;

[0025] An encapsulation layer is arranged on a side of the light-emitting functional layer away from the driving circuit layer;

[0026] Among them, the OLED display panel includes a display area and an overlapping area, in the overlapping area, an electron injection layer and an electron transport layer are provided between the common electrode layer and the metal terminal, one side of the first metal terminal is connected to a high potential voltage end, and the other side of the first metal terminal is connected to the electron transport layer, one side of the second metal terminal is connected to the electron transport layer, and the other side of the second metal terminal is connected to a low potential voltage end, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the conduction voltage of the metal terminal and the common electrode layer.

[0027] Beneficial effects: The present application provides an OLED display panel and an OLED display device; the OLED display panel includes a substrate, a driving circuit layer, a light-emitting functional layer and an encapsulation layer, the driving circuit layer is arranged on one side of the substrate, the driving circuit layer includes a metal terminal, the metal terminal includes a first metal terminal and a second metal terminal, the first metal terminal and the second metal terminal are insulated, 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 injection layer, an electron transport layer and a common electrode layer, the encapsulation layer is arranged on a side of the light-emitting functional layer away from the driving circuit layer, wherein the OLED display panel includes a display area and an overlapping area, in the overlapping area, an electron injection layer and an electron transport layer are arranged between the common electrode layer and the metal terminal, the first metal terminal is connected to a high potential voltage end, the other side of the first metal terminal is connected to the electron transport layer, one side of the second metal terminal is connected to the electron transport layer, the other side of the second metal terminal is connected to a low potential voltage end, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the conduction voltage of the metal terminal and the common electrode layer. In the present application, by arranging the electron injection layer and the electron transport layer in the overlapping area, the electron injection layer, the electron transport layer and the common electrode layer can be formed by a metal mask, thereby improving the preparation efficiency of the OLED display panel and reducing the cost. At the same time, the first metal terminal and the second metal terminal are respectively connected through the high potential voltage end and the low potential voltage end, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the conduction voltage of the metal terminal and the common electrode layer. Therefore, even if the conductivity of the electron injection layer and the electron transport layer is poor, under the action of voltage, the electron injection layer and the electron transport layer can be burned through or through electron migration to achieve conduction between the common electrode layer and the metal terminal, so that the OLED display panel can work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0029] Figure 1 This is a first schematic diagram of an OLED display panel provided in an embodiment of the present application.

[0030] Figure 2A second schematic diagram of an OLED display panel provided in an embodiment of the present application.

[0031] Figure 3 This is a third schematic diagram of the OLED display panel provided in an embodiment of the present application.

[0032] Figure 4 A schematic diagram comparing the design of the mask of the OLED display panel provided in the embodiment of the present application with the design of the mask of the existing OLED display panel.

[0033] Figure 5 A schematic diagram of an OLED display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0035] The embodiments of the present application provide an OLED display panel and an OLED display device to solve the technical problem that the production efficiency of the existing OLED display device is low due to the different masks of the cathode and the electron injection layer / electron transport layer.

[0036] like Figure 1 , Figure 2 As shown, an embodiment of the present application provides an OLED display panel, and the OLED display panel 1 includes:

[0037] Substrate 11;

[0038] The driving circuit layer 12 is disposed on one side of the substrate 11. The driving circuit layer 12 includes a metal terminal 127d. The metal terminal 127d includes a first metal terminal 127b and a second metal terminal 127c. The first metal terminal 127b is insulated from the second metal terminal 127c.

[0039] The light-emitting functional layer 13 is disposed on a side of the driving circuit layer 12 away from the substrate 11, and the light-emitting functional layer 13 includes an electron injection layer 132e, an electron transport layer 132d and a common electrode layer 134;

[0040] The encapsulation layer 14 is disposed on a side of the light-emitting functional layer 13 away from the driving circuit layer 12;

[0041] Among them, the OLED display panel 1 includes a display area 151 and an overlapping area 152. In the overlapping area 152, an electron injection layer 132e and an electron transport layer 132d are provided between the common electrode layer 134 and the metal terminal 127d. One side of the first metal terminal 127b is connected to the high potential voltage end 212, and the other side of the first metal terminal 127b is connected to the electron transport layer 132d. One side of the second metal terminal 127c is connected to the electron transport layer 132d, and the other side of the second metal terminal 127c is connected to the low potential voltage end 214. The voltage difference between the high potential voltage end 212 and the low potential voltage end 214 is greater than the turn-on voltage of the metal terminal 127d and the common electrode layer 134.

[0042] An embodiment of the present application provides an OLED display panel. The OLED display panel arranges an electron injection layer and an electron transport layer in an overlap region. A metal mask can be used to form the electron injection layer, the electron transport layer and the common electrode layer, thereby improving the preparation efficiency of the OLED display panel and reducing the cost. At the same time, a first metal terminal and a second metal terminal are respectively connected through a high potential voltage terminal and a low potential voltage terminal. The voltage difference between the high potential voltage terminal and the low potential voltage terminal is greater than the conduction voltage of the metal terminal and the common electrode layer. Therefore, even if the conductivity of the electron injection layer and the electron transport layer is poor, under the action of voltage, the electron injection layer and the electron transport layer can be burned through or through electron migration to achieve conduction between the common electrode layer and the metal terminal, thereby allowing the OLED display panel to operate normally.

[0043] It should be noted that the on-voltage of the metal terminal and the common electrode layer refers to the voltage that can turn on the metal terminal and the common electrode layer when the voltage is input. Specifically, it can be that the metal terminal and the common electrode layer are turned on by allowing a larger voltage to pass through the electron injection layer and the electron transport layer. In this case, the voltage can be used as the on-voltage. It can also be that the metal particles migrate under the action of the electric field through the input voltage, thereby turning on the metal terminal and the common electrode layer. In this case, the voltage can be used as the on-voltage. The on-voltage of the present application is not limited to the above examples, and is described in detail in the following embodiments.

[0044] It should be noted that in Figure 2 In the embodiment, the high potential voltage terminal 212 is connected to the first metal terminal 127b through the first metal wiring 211, and the low potential voltage terminal 214 is connected to the second metal terminal 127c through the second metal wiring 213. Figure 2It is a perspective view, and therefore the high potential voltage terminal, the low potential voltage terminal, the first metal routing, and the second metal routing are shown to be located outside the OLED display panel. However, in the actual design process, the high potential voltage terminal, the low potential voltage terminal, the first metal routing, and the second metal routing will be arranged inside the OLED display panel to protect the routings and terminals and facilitate the connection between the terminals.

[0045] Specifically, for example, the first metal routing, the second metal routing, the high potential voltage terminal, and the low potential voltage terminal can all be formed by the source and drain layer, but the embodiments of the present application are not limited to this. For example, in order to avoid the first metal routing, the second metal routing, the high potential voltage terminal, and the low potential voltage terminal occupying the space of the source and drain layer, they can be formed by the first metal layer, the second metal layer and the light shielding layer.

[0046] It should be noted that Figure 2 The common electrode layer is indicated by reference numeral 134, and reference numeral 134 shows the boundary of the common electrode layer. However, in fact, since the common electrode layer, electron injection layer and electron transport layer in the present application are formed by the same mask, although there may be certain errors, resulting in the common electrode layer and the electron injection layer and the electron transport layer not being able to completely overlap, the boundary of the common electrode layer can be identified as the boundary between the electron injection layer and the electron transport layer, that is, the boundary of the common electrode layer represented by reference numeral 134 can also be the boundary between the electron injection layer and the electron transport layer, and an electron injection layer and an electron transport layer are provided between the metal terminal and the common electrode layer, that is, the common electrode layer and the electron injection layer and the electron transport layer can be formed by the same mask.

[0047] In one embodiment, if Figure 2 As shown, the first metal terminal 127b and the second metal terminal 127c are respectively arranged in the overlapping areas 152 on both sides of the display area 151. By arranging the first metal terminal and the second metal terminal connected to the high potential voltage end and the low potential voltage end respectively in the overlapping areas on both sides, when the common electrode layer and the metal terminal are turned on, the current will sequentially go from the first metal wiring to the first metal terminal, then from the first metal terminal to the electron transport layer and the electron injection layer on the first metal terminal, and then from the electron injection layer on the first metal terminal to the common electrode layer. Since the common electrode layer is arranged on the whole surface and is conductive on the whole surface, the current will go from the common electrode to the electron injection layer on the second metal terminal, then from the electron injection layer on the second metal terminal to the electron transport layer and the second metal terminal, and then from the second metal terminal to the second metal wiring, thereby obtaining a loop from the high potential voltage end to the low potential voltage end, and turning on the common electrode layer and the metal terminal.

[0048] In the above embodiment, the first metal terminal and the second metal terminal are arranged on both sides of the display area to achieve the connection between the common electrode layer and the metal terminal. However, the embodiments of the present application are not limited thereto. For example, in order to save space, the first metal terminal and the second metal terminal can be arranged on one side of the display area. Accordingly, the arrangement of the positive connection terminal and the negative connection terminal in the following embodiment can also adopt the arrangement of the overlap area on one side of the display area, which will not be described in detail in the following embodiment.

[0049] In one embodiment, if Figure 3 As shown, the first metal terminal 127b includes a plurality of positive connection terminals (e.g., a first positive connection terminal 311 and a second positive connection terminal 312), and the second metal terminal 127c includes a plurality of negative connection terminals (e.g., a first negative connection terminal 313 and a second negative connection terminal 314), the positive connection terminals are arranged in the overlapping areas 152 on both sides of the display area 151, the negative connection terminals are arranged in the overlapping areas 152 on both sides of the display area 151, and the positive connection terminals are arranged correspondingly to the negative connection terminals. By setting a plurality of positive connection terminals and a plurality of negative connection terminals, when the common electrode layer is connected to the metal terminal, the transmission of different signals can be realized by the conduction of the plurality of connection terminals or the conduction of the plurality of connection terminals can be realized, so as to avoid the problem of a circuit breaker in the connection of a certain metal terminal, and the conduction of the common electrode layer and the metal terminal can still be realized through other metal terminals.

[0050] In one embodiment, if Figure 3 As shown, the positive connection terminal includes a first positive connection terminal 311 and a second positive connection terminal 312, and the negative connection terminal includes a first negative connection terminal 313 and a second negative connection terminal 314. The first positive connection terminal 311 and the first negative connection terminal 313 are arranged in the overlapping area 152 on one side of the display area 151, and the second positive connection terminal 312 and the second negative connection terminal 314 are arranged in the overlapping area 152 on the other side of the display area 151, and the first positive connection terminal 311 is electrically connected to the first negative connection terminal 313, and the second positive connection terminal 312 is electrically connected to the second negative connection terminal 314. By electrically connecting the first positive connection terminal and the first negative connection terminal on the same side, and electrically connecting the second positive connection terminal and the second negative connection terminal on the same side, two-point conduction between the common electrode layer and the metal terminal is achieved.

[0051] It should be noted that the electrical connection in the embodiments of the present application means that the current will flow from one end to the other end. Since the first metal terminal and the second metal terminal in the present application are insulated, the electrical connection in the embodiments of the present application does not include a physical connection between the two ends. For example, the first positive connection terminal is electrically connected to the first negative connection terminal, which means that the current will flow from the first positive connection terminal to the first negative connection terminal, or the current will flow from the first negative connection terminal to the first positive connection terminal, but it does not mean that the first positive connection terminal is physically connected to the first negative connection terminal. The electrical connection in the following embodiments shall also be based on this and will not be repeated in the following embodiments.

[0052] In one embodiment, the positive connection terminal includes a third positive connection terminal and a fourth positive connection terminal, and the negative connection terminal includes a third negative connection terminal and a fourth negative connection terminal. The third positive connection terminal and the fourth positive connection terminal are arranged in a terminal area on one side of the display area, and the third negative connection terminal and the fourth negative connection terminal are arranged in a terminal area on the other side of the display area, and the third positive connection terminal is electrically connected to the third negative connection terminal, and the fourth positive connection terminal is electrically connected to the fourth negative connection terminal. By arranging the positive connection terminal in the terminal area on one side of the display area, and the negative connection terminal in the terminal area on the other side of the display area, and then connecting the positive connection terminals on both sides to the negative connection terminals, the common electrode layer is connected to the metal terminal, and at the same time, through the corresponding connection of multiple connection terminals, the common electrode layer and the metal terminal are connected at multiple locations.

[0053] In one embodiment, the positive connection terminal includes a fifth positive connection terminal and a sixth positive connection terminal, and the negative connection terminal includes a fifth negative connection terminal and a sixth negative connection terminal, wherein the fifth positive connection terminal and the fifth negative connection terminal are arranged in a terminal area on one side of the display area, and the sixth positive connection terminal and the sixth negative connection terminal are arranged in a terminal area on the other side of the display area, and the fifth positive connection terminal is electrically connected to the sixth negative connection terminal, and the sixth positive connection terminal is electrically connected to the fifth negative connection terminal. By arranging the positive connection terminal and the negative connection terminal on both sides of the display area, and electrically connecting the positive connection terminal and the negative connection terminal on both sides, the conduction between the common electrode layer and the metal terminal is realized, and by correspondingly connecting the connection terminals, the conduction between the common electrode layer and the metal terminal is realized at multiple locations.

[0054] In the above embodiment, the first positive connection terminal to the sixth positive connection terminal and the first negative connection terminal to the sixth negative connection terminal are used to describe in detail a variety of connection methods. However, it should be noted that the first, second to sixth in the embodiment of the present application do not specifically refer to a certain connection terminal, and multiple connection methods can be used to achieve conduction between the metal terminal and the common electrode layer without conflict, which will not be repeated here.

[0055] When the materials of the electron injection layer and the electron transport layer are organic materials, the metal terminal and the common electrode layer cannot be turned on, resulting in the need to use two different masks to form the common electrode layer and the electron injection layer and the electron transport layer respectively, and the display device is less prepared. In one embodiment, the material of the electron injection layer includes an organic material, the material of the electron transport layer includes an organic material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the turn-on voltage of the electron injection layer and the electron transport layer. When the materials of the electron injection layer and the electron transport layer are organic materials, the conductivity of the electron injection layer and the electron transport layer is poor. The high potential voltage end and the low potential voltage end are respectively connected through the first metal terminal and the second metal terminal, so that the voltage difference between the high potential voltage end and the low potential voltage end is greater than the conduction voltage of the electron injection layer and the electron transport layer. At this time, the current can break through the electron injection layer and the electron transport layer, or the temperature rise caused by the voltage can burn through the electron injection layer and the electron transport layer. The materials of the metal terminal and the common electrode layer are both conductive materials, so that the metal terminal and the common electrode layer can be turned on, so that when the common electrode layer, the electron injection layer and the electron transport layer are formed using a mask, the common electrode layer and the metal terminal can also be turned on.

[0056] In one embodiment, when voltage is input to the high potential voltage terminal and the low potential voltage terminal, the temperature range of the overlap region is 50 degrees Celsius to 120 degrees Celsius. Since both the electron injection layer and the electron transport layer are organic materials, when the input voltage causes the temperature of the overlap region to rise, the electron injection layer and the electron transport layer will be burned through, so that the common electrode layer and the metal terminal are fused together in the overlap region to achieve conduction between the common electrode layer and the metal terminal, and between 50 degrees Celsius and 120 degrees Celsius, the stability of the metal terminal and the common electrode layer is good, and the common electrode layer and the metal terminal will not be burned due to the temperature rise, affecting the display effect.

[0057] Specifically, the sum of the thickness of the electron injection layer and the thickness of the electron transport layer is less than 200 nanometers. By reducing the thickness of the electron injection layer and the electron transport layer, the electron injection layer and the electron transport layer can be burned through.

[0058] When the materials of the electron injection layer and the electron transport layer are organic materials, the metal terminal and the common electrode layer cannot be connected, resulting in the need to use two different masks to form the common electrode layer and the electron injection layer and the electron transport layer respectively, and the problem of low preparation of the display device. In one embodiment, the material of the common electrode layer includes a metal material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the first migration voltage of the metal material. By setting the material of the common electrode layer to a metal material, and making the voltage difference between the high potential voltage end and the low potential voltage end greater than the first migration voltage of the metal material, when the voltage is input, the metal particles in the common electrode layer will migrate to the electron injection layer and the electron transport layer, thereby improving the conductivity of the electron injection layer and the electron transport layer, achieving conduction between the common electrode layer and the metal terminal, and improving the preparation efficiency of the display panel.

[0059] Specifically, the first migration voltage refers to a voltage that can cause the metal material to migrate and conduct the metal terminal and the common electrode layer. For example, when the voltage is 2 volts, the metal material can migrate and conduct the metal terminal and the common electrode layer. In this case, 2 volts can be set as the first migration voltage.

[0060] Specifically, the material of the common electrode layer includes silver or a silver alloy. Since silver has a high mobility, using silver as the material of the common electrode layer can improve the migration effect, thereby improving the conduction effect between the metal terminal and the common electrode layer.

[0061] Specifically, for OLED display panels including top-emitting OLED display panels and bottom-emitting OLED display panels, the use of silver as the common electrode layer in the top-emitting OLED display panel will lead to a problem of low transmittance. Therefore, when the embodiment of the present application uses silver or silver alloy as the top-emitting OLED display panel, the thickness of the common electrode layer can be made smaller, for example, the thickness of the common electrode layer is 10 nanometers to 30 nanometers, thereby ensuring the transmittance of the top-emitting OLED display panel, and for the bottom-emitting OLED display device, the common electrode layer can be made thicker, thereby improving the reflectivity.

[0062] In one embodiment, the common electrode layer is a single-layer arrangement, and the thickness of the common electrode layer is reduced by adopting a single-layer arrangement, while improving the migration effect of particles, so that the common electrode layer and the metal terminal are connected. However, the embodiments of the present application are not limited thereto, and the common electrode layer can also be a multi-layer arrangement, wherein one layer is formed of silver or a silver alloy.

[0063] When the materials of the electron injection layer and the electron transport layer are organic materials, the metal terminal and the common electrode layer cannot be connected, resulting in the need to use two different masks to form the common electrode layer and the electron injection layer and the electron transport layer respectively, and the display device is less prepared. In one embodiment, the material of the electron injection layer includes a first conductive material, the material of the electron transport layer includes an organic material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the second migration voltage of the electron injection layer. By using a conductive material as the material of the electron injection layer, and making the voltage difference between the high potential voltage end and the low potential voltage end greater than the second migration voltage of the electron injection layer, when the voltage is input, the conductive particles in the electron injection layer can migrate and migrate to the electron transport layer under the action of the electric field. Since the common electrode layer and the metal terminal are conductive materials, when the common electrode layer, the electron injection layer and the electron transport layer are formed using the same mask, the common electrode layer and the metal terminal can be connected.

[0064] Specifically, the material of the electron injection layer includes lithium and ytterbium.

[0065] Specifically, the second migration voltage refers to the voltage that causes the conductive material in the electron injection layer to migrate and conduct the metal terminal and the common electrode layer. For example, when the voltage is 2 volts, the conductive material can migrate and conduct the metal terminal and the common electrode layer, then 2 volts can be set as the second migration voltage.

[0066] In one embodiment, the electron transport layer is doped with a second conductive material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than a third migration voltage of the second conductive material. By doping the electron transport layer with a conductive material and enabling the conductive material to migrate, a path is formed between the metal terminal and the common electrode layer, thereby conducting the common electrode layer and the metal terminal.

[0067] Specifically, the third migration voltage refers to the voltage that causes the conductive material in the electron transport layer to migrate and conduct the metal terminal and the common electrode layer. For example, when the voltage is 2 volts, the conductive material can migrate and conduct the metal terminal and the common electrode layer, then 2 volts can be set as the third migration voltage.

[0068] When the materials of the electron injection layer and the electron transport layer are organic materials, the metal terminal and the common electrode layer cannot be connected, resulting in the need to use two different masks to form the common electrode layer and the electron injection layer and the electron transport layer respectively, and the display device is prepared at a low level. In one embodiment, the material of the electron injection layer includes an organic material, the material of the electron transport layer includes an organic material, at least one of the electron injection layer and the electron transport layer is doped with a third conductive material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the fourth migration voltage of the third conductive material. By doping the electron injection layer and the electron transport layer with conductive materials, and making the voltage difference between the high potential voltage end and the low potential voltage end greater than the migration voltage of the conductive material, when the voltage is input, the doped metal forms a microscopic metal filament, so that the electron injection layer and the electron transport layer can form a path, and the metal terminal and the common electrode layer are connected. When the common electrode layer, the electron injection layer and the electron transport layer are formed using the same mask, the common electrode layer and the metal terminal can be connected, thereby improving the preparation efficiency of the OLED display panel.

[0069] Specifically, the fourth migration voltage refers to a voltage that causes the electron transport layer and / or the conductive material in the electron transport layer to migrate and conduct the metal terminal and the common electrode layer. For example, when the voltage is 2 volts, the conductive material can migrate and conduct the metal terminal and the common electrode layer. In this case, 2 volts can be set as the fourth migration voltage.

[0070] It should be noted that the first conductive material, the second conductive material and the third conductive material may be the same material or different materials.

[0071] It should be noted that, in the above-mentioned embodiments, the voltages under different settings are described using the first migration voltage to the fourth migration voltage and the on-voltage, but the first to fourth and the names of each voltage do not limit a specific numerical value of a certain voltage, nor do they limit a certain voltage to be greater than another voltage. For example, the first migration voltage is not necessarily greater than the second migration voltage. The first migration voltage can be the same as the second migration voltage, the first migration voltage can be greater than the second migration voltage, or the first migration voltage can be less than the second migration voltage as needed.

[0072] It should be noted that the above embodiments are described in detail by taking the electron injection layer as an organic material, the electron transport layer as an organic material, the common electrode layer as a metal material, the electron injection layer as a conductive material, the electron transport layer as an organic material, and the electron injection layer and the electron transport layer as organic materials and doped conductive materials as examples. However, since some features in the above embodiments do not conflict, the embodiments of the present application may take multiple features as one embodiment. The embodiments of the present application are not limited to the above embodiments. When the features do not conflict, multiple features may be combined as one embodiment to further improve the conduction effect of the common electrode layer and the metal terminal.

[0073] Specifically, in order to illustrate that multiple features can be combined as an embodiment, the embodiments of the present application include multiple combined embodiments, but not all embodiments are listed one by one. Two embodiments are used as examples in the following embodiments.

[0074] In one embodiment, the material of the electron transport layer includes an organic material, the material of the electron injection layer includes an organic material, at least one of the electron transport layer and the electron injection layer is doped with a conductive material, the material of the common electrode layer includes a metal material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the turn-on voltage of the electron injection layer and the electron transport layer. By doping the electron transport layer and the electron injection layer with a conductive material, the material of the common electrode layer includes a metal material, and at the same time, the voltage difference between the high potential voltage end and the low potential voltage end is greater than the turn-on voltage of the electron injection layer and the electron transport layer, then under the action of the electric field, the electron injection layer and the electron transport layer will be burned through, and at the same time, the metal particles of the common electrode layer, the electron injection layer and / or the conductive particles in the electron transport layer will migrate, so that the metal terminal and the common electrode layer are turned on in multiple ways at the same time, so that when the common electrode layer, the electron injection layer and the electron transport layer are formed using the same mask, the common electrode layer and the metal terminal can be turned on, thereby improving the preparation efficiency of the OLED display panel.

[0075] Specifically, the material of the electron transport layer may include an organic material, the material of the electron injection layer may include a conductive material, the electron transport layer may be doped with a conductive material, the material of the common electrode layer may include a metal material, and the voltage difference between the high potential voltage end and the low potential voltage end may be greater than the conduction voltage of the electron injection layer and the electron transport layer. This embodiment of the present application takes this as an example and will not be described in detail.

[0076] The above embodiment is described in detail by taking voltage control to conduct the common electrode layer and the metal terminal as an example. For the specific control of voltage, it is necessary to determine the voltage size according to the overlap area of ​​the common electrode layer and the metal terminal, the materials of the electron injection layer and the electron transport layer, the thickness of the electron injection layer and the electron transport layer, the materials of the common electrode layer and the circuit design, so as to determine the current size, so as to conduct the common electrode layer and the metal terminal while avoiding damage to the common electrode layer.

[0077] Specifically, the common electrode layer and the metal terminal can be controlled to be turned on by current and time. The specific current and time are determined according to the above factors, which will not be described in detail here.

[0078] like Figure 4 As shown, Figure 4 (a) is a design scheme of the mask of the existing OLED display panel. Figure 4 As can be seen from (a), since the electron injection layer and the electron transport layer cannot conduct electricity to the common electrode layer and the metal terminal, the film forming area of ​​the electron injection layer and the electron transport layer needs to be smaller than the film forming area of ​​the common electrode layer, and the boundary 413 of the electron injection layer and / or the electron transport layer is located below the boundary 411 of the common electrode layer. The boundary 415 of the first mask is different from the boundary 412 of the second mask, so that the electron injection layer and the electron transport layer can be close to the boundary 416 of the display area without covering the overlapping area 414. Therefore, the existing OLED display device needs to use different masks to form the common electrode layer, the electron injection layer and the electron transport layer.

[0079] like Figure 4 As shown in (b), the present application forms the electron injection layer, the electron transport layer and the common electrode layer by using one mask. When the boundary 424 of the display area and the overlapping area 152 are not changed, there is only one boundary 423 of the mask. The boundary 422 of the electron injection layer and / or the electron transport layer is basically overlapped with or even overlaps with the boundary 421 of the common electrode layer. By connecting the common electrode layer and the metal terminal in the above embodiment, the electron injection layer, the electron transport layer and the common electrode layer are formed by using the same mask, thereby improving the preparation efficiency of the OLED display panel and reducing the cost.

[0080] In one embodiment, if Figure 1 As shown, the driving circuit layer 12 includes an active layer 121 , a first gate insulating layer 122 , a first metal layer 123 , a second gate insulating layer 124 , a second metal layer 125 , an interlayer insulating layer 126 , a source and drain electrode layer 127 and a planarization layer 128 .

[0081] In one embodiment, if Figure 1 As shown, the source-drain electrode layer 127 includes a source electrode 127 a and a drain electrode.

[0082] In one embodiment, if Figure 1 As shown, the light-emitting functional layer 13 includes a pixel electrode layer 131 , a light-emitting material layer 132 and a pixel definition layer 133 .

[0083] In one embodiment, if Figure 1 As shown, the light emitting material layer 132 includes a hole injection layer 132a, a hole transport layer 132b and a light emitting layer 132c.

[0084] At the same time, if Figure 1 , Figure 2 , Figure 5 As shown, an embodiment of the present application provides an OLED display device, which includes an OLED display panel 1 and a power supply 51. The OLED display panel 1 includes:

[0085] Substrate 11;

[0086] The driving circuit layer 12 is disposed on one side of the substrate 11. The driving circuit layer 12 includes a metal terminal 127d. The metal terminal 127d includes a first metal terminal 127b and a second metal terminal 127c. The first metal terminal 127b is insulated from the second metal terminal 127c.

[0087] The light-emitting functional layer 13 is disposed on a side of the driving circuit layer 12 away from the substrate 11, and the light-emitting functional layer 13 includes an electron injection layer 132e, an electron transport layer 132d and a common electrode layer 134;

[0088] The encapsulation layer 14 is disposed on a side of the light-emitting functional layer 13 away from the driving circuit layer 12;

[0089] Among them, the OLED display panel 1 includes a display area 151 and an overlapping area 152. In the overlapping area 152, an electron injection layer 132e and an electron transport layer 132d are provided between the common electrode layer 134 and the metal terminal 127d. One side of the first metal terminal 127b is connected to the high potential voltage end 212, and the other side of the first metal terminal 127b is connected to the electron transport layer 132d. One side of the second metal terminal 127c is connected to the electron transport layer 132d, and the other side of the second metal terminal 127c is connected to the low potential voltage end 214. The voltage difference between the high potential voltage end 212 and the low potential voltage end 214 is greater than the turn-on voltage of the metal terminal 127d and the common electrode layer 134.

[0090] An embodiment of the present application provides an OLED display device, which includes an OLED display panel and a power supply. The OLED display panel can use a metal mask to form the electron injection layer, the electron transport layer and the common electrode layer by arranging the electron injection layer and the electron transport layer in the overlap region, thereby improving the preparation efficiency of the OLED display panel. At the same time, a first metal terminal and a second metal terminal are respectively connected through a high potential voltage terminal and a low potential voltage terminal, and the voltage difference between the high potential voltage terminal and the low potential voltage terminal is greater than the conduction voltage of the metal terminal and the common electrode layer, so that even if the conductivity of the electron injection layer and the electron transport layer is poor, under the action of voltage, the electron injection layer and the electron transport layer can be burned through or through electron migration to achieve conduction between the common electrode layer and the metal terminal, so that the OLED display panel can work normally.

[0091] In one embodiment, the high potential voltage terminal is connected to the positive electrode of the power supply, and the low potential voltage terminal is connected to the negative electrode of the power supply.

[0092] In one embodiment, in an OLED display device, the first metal terminal and the second metal terminal are respectively disposed in overlapping areas on both sides of the display area.

[0093] In one embodiment, in an OLED display device, the first metal terminal includes a plurality of positive connection terminals, the second metal terminal includes a plurality of negative connection terminals, the positive connection terminals are arranged in overlapping areas on both sides of the display area, the negative connection terminals are arranged in overlapping areas on both sides of the display area, and the positive connection terminals are arranged corresponding to the negative connection terminals.

[0094] In one embodiment, in an OLED display device, the positive connection terminal includes a first positive connection terminal and a second positive connection terminal, the negative connection terminal includes a first negative connection terminal and a second negative connection terminal, the first positive connection terminal and the first negative connection terminal are arranged in an overlapping area on one side of the display area, the second positive connection terminal and the second negative connection terminal are arranged in an overlapping area on the other side of the display area, and the first positive connection terminal is electrically connected to the first negative connection terminal, and the second positive connection terminal is electrically connected to the second negative connection terminal.

[0095] In one embodiment, in an OLED display device, the positive connection terminal includes a third positive connection terminal and a fourth positive connection terminal, the negative connection terminal includes a third negative connection terminal and a fourth negative connection terminal, the third positive connection terminal and the fourth positive connection terminal are arranged in a terminal area on one side of the display area, the third negative connection terminal and the fourth negative connection terminal are arranged in a terminal area on the other side of the display area, and the third positive connection terminal is electrically connected to the third negative connection terminal, and the fourth positive connection terminal is electrically connected to the fourth negative connection terminal.

[0096] In one embodiment, in an OLED display device, the material of the electron injection layer includes an organic material, the material of the electron transport layer includes an organic material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the turn-on voltage of the electron injection layer and the electron transport layer.

[0097] In one embodiment, in an OLED display device, when voltages are input to the high potential voltage terminal and the low potential voltage terminal, the temperature of the overlapping region ranges from 50 degrees Celsius to 120 degrees Celsius.

[0098] In one embodiment, in an OLED display device, the material of the common electrode layer includes a metal material, and the voltage difference between the high potential voltage terminal and the low potential voltage terminal is greater than a first migration voltage of the metal material.

[0099] In one embodiment, in an OLED display device, the material of the electron injection layer includes a conductive material, the material of the electron transport layer includes an organic material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the second migration voltage of the electron injection layer.

[0100] According to the above embodiments, it can be seen that:

[0101] The embodiments of the present application provide an OLED display panel and an OLED display device, wherein the OLED display panel includes a substrate, a driving circuit layer, a light-emitting functional layer and an encapsulation layer, wherein the driving circuit layer is arranged on one side of the substrate, the driving circuit layer includes a metal terminal, the metal terminal includes a first metal terminal and a second metal terminal, the first metal terminal and the second metal terminal are insulated, 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 injection layer, an electron transport layer and a common electrode layer, and the encapsulation layer is arranged on a side of the light-emitting functional layer away from the driving circuit layer, wherein the OLED display panel includes a display area and an overlap area, in the overlap area, an electron injection layer and an electron transport layer are arranged between the common electrode layer and the metal terminal, the first metal terminal is connected to a high potential voltage end, the other side of the first metal terminal is connected to the electron transport layer, one side of the second metal terminal is connected to the electron transport layer, and the other side of the second metal terminal is connected to a low potential voltage end, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the conduction voltage of the metal terminal and the common electrode layer. In the present application, the electron injection layer and the electron transport layer are arranged in the overlapping area, and a metal mask can be used to form the electron injection layer, the electron transport layer and the common electrode layer, thereby improving the preparation efficiency of the OLED display panel. At the same time, the first metal terminal and the second metal terminal are respectively connected through the high potential voltage end and the low potential voltage end, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the conduction voltage of the metal terminal and the common electrode layer. Therefore, even if the conductivity of the electron injection layer and the electron transport layer is poor, under the action of voltage, the electron injection layer and the electron transport layer can be burned through or through electron migration to achieve conduction between the common electrode layer and the metal terminal, so that the OLED display panel can work normally.

[0102] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0103] The above is a detailed introduction to an OLED display panel and an OLED display device provided in the embodiments 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 replace some of the technical features therein with equivalents; and 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, characterized in that: include: substrate; A driving circuit layer is arranged on one side of the substrate, the driving circuit layer comprises metal terminals, the metal terminals comprise a first metal terminal and a second metal terminal, the first metal terminal is insulated from the second metal terminal; A light-emitting functional layer is arranged on a side of the driving circuit layer away from the substrate, and the light-emitting functional layer includes an electron injection layer, an electron transport layer and a common electrode layer; An encapsulation layer is arranged on a side of the light-emitting functional layer away from the driving circuit layer; The OLED display panel includes a display area and an overlap area, in which an electron injection layer and an electron transport layer are provided between the common electrode layer and the metal terminal in the overlap area, one side of the first metal terminal is connected to a high potential voltage terminal, and the other side of the first metal terminal is connected to the electron transport layer, one side of the second metal terminal is connected to the electron transport layer, and the other side of the second metal terminal is connected to a low potential voltage terminal, and a voltage difference between the high potential voltage terminal and the low potential voltage terminal is greater than a turn-on voltage of the metal terminal and the common electrode layer; The portions of the common electrode layer, the electron injection layer and the electron transport layer located in the display area are respectively connected to the portions of the common electrode layer, the electron injection layer and the electron transport layer located in the overlapping area.

2. The OLED display panel according to claim 1, wherein: The first metal terminal and the second metal terminal are respectively arranged in overlapping areas on both sides of the display area.

3. The OLED display panel according to claim 1, wherein: The first metal terminal includes a plurality of positive connection terminals, and the second metal terminal includes a plurality of negative connection terminals. The positive connection terminals are arranged in the overlapping areas on both sides of the display area, and the negative connection terminals are arranged in the overlapping areas on both sides of the display area, and the positive connection terminals are arranged correspondingly to the negative connection terminals.

4. The OLED display panel according to claim 3, wherein: The positive connection terminal includes a first positive connection terminal and a second positive connection terminal, and the negative connection terminal includes a first negative connection terminal and a second negative connection terminal. The first positive connection terminal and the first negative connection terminal are arranged in a overlapping area on one side of the display area, and the second positive connection terminal and the second negative connection terminal are arranged in a overlapping area on the other side of the display area, and the first positive connection terminal is electrically connected to the first negative connection terminal, and the second positive connection terminal is electrically connected to the second negative connection terminal.

5. The OLED display panel according to claim 3, wherein: The positive connection terminal includes a third positive connection terminal and a fourth positive connection terminal, and the negative connection terminal includes a third negative connection terminal and a fourth negative connection terminal. The third positive connection terminal and the fourth positive connection terminal are arranged in a terminal area on one side of the display area, and the third negative connection terminal and the fourth negative connection terminal are arranged in a terminal area on the other side of the display area, and the third positive connection terminal is electrically connected to the third negative connection terminal, and the fourth positive connection terminal is electrically connected to the fourth negative connection terminal.

6. The OLED display panel according to claim 1, wherein: The material of the electron injection layer includes an organic material, the material of the electron transport layer includes an organic material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than the turn-on voltage of the electron injection layer and the electron transport layer.

7. The OLED display panel according to claim 1, wherein: When voltage is input to the high potential voltage terminal and the low potential voltage terminal, the temperature range of the overlapping area is 50 degrees Celsius to 120 degrees Celsius.

8. The OLED display panel according to claim 1, wherein: The material of the common electrode layer includes a metal material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than a first migration voltage of the metal material.

9. The OLED display panel according to claim 1, wherein: The material of the electron injection layer includes a first conductive material, the material of the electron transport layer includes an organic material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than a second migration voltage of the electron injection layer.

10. The OLED display panel according to claim 9, wherein: The electron transport layer is doped with a second conductive material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than a third migration voltage of the second conductive material.

11. The OLED display panel according to claim 1, wherein: The material of the electron injection layer includes an organic material, the material of the electron transport layer includes an organic material, at least one of the electron injection layer and the electron transport layer is doped with a third conductive material, and the voltage difference between the high potential voltage end and the low potential voltage end is greater than a fourth migration voltage of the third conductive material.

12. An OLED display device, characterized in that: The device comprises an OLED display panel and a power supply, wherein the OLED display panel comprises: substrate; A driving circuit layer is arranged on one side of the substrate, the driving circuit layer comprises metal terminals, the metal terminals comprise a first metal terminal and a second metal terminal, the first metal terminal is insulated from the second metal terminal; A light-emitting functional layer is arranged on a side of the driving circuit layer away from the substrate, and the light-emitting functional layer includes an electron injection layer, an electron transport layer and a common electrode layer; An encapsulation layer is arranged on a side of the light-emitting functional layer away from the driving circuit layer; The OLED display panel includes a display area and an overlap area, in which an electron injection layer and an electron transport layer are provided between the common electrode layer and the metal terminal in the overlap area, one side of the first metal terminal is connected to a high potential voltage terminal, and the other side of the first metal terminal is connected to the electron transport layer, one side of the second metal terminal is connected to the electron transport layer, and the other side of the second metal terminal is connected to a low potential voltage terminal, and a voltage difference between the high potential voltage terminal and the low potential voltage terminal is greater than a turn-on voltage of the metal terminal and the common electrode layer; The portions of the common electrode layer, the electron injection layer and the electron transport layer located in the display area are respectively connected to the portions of the common electrode layer, the electron injection layer and the electron transport layer located in the overlapping area.

Images