It should be explained that in FIG. 2 the common electrode layer is marked with a reference number 134, the reference number 134 shows the boundary of the common electrode layer. However, actually, because of the common electrode layer in the present application, the electron injection layer and the electron transport layer are formed by the same mask plate. Although, a certain error exists to cause the common electrode layer unable to completely coincide with the electron injection layer and the electron transport layer, the boundary of the common electrode layer can be deemed as the boundary of the electron injection layer and the electron transport layer. Namely, the boundary of the common electrode layer referred to by the reference number 134 can also be the boundary of the electron injection layer and the electron transport layer. The electron injection layer and the electron transport layer are disposed between the metal terminal and the common electrode layer. Namely, the common electrode layer, the electron injection layer and the electron transport layer can be formed by the same mask plate.

In an embodiment, with reference to FIGS. 2, the first metal terminal 127b and the second metal terminal 127c are disposed in the bridge region 152 on two sides of the display region 151. Disposing the first metal terminal and the second metal terminal connected respectively to the high-level voltage end and the low-level voltage end in the bridge region of the two sides makes a current sequentially move from the first metal wiring to the first metal terminal, then move from the first metal terminal to the parts of the electron transport layer and the electron injection layer on the first metal terminal, and then move from the part of the electron injection layer on the first metal terminal to the common electrode layer when the common electrode layer and the metal terminal are conductively connected. Because common electrode layer is disposed in an entire surface and is conductive with the entire surface, a current would move from the common electrode to the electron injection layer on the second metal terminal, then move from the electron injection layer on the second metal terminal to the electron transport layer and the second metal terminal, and then move from the second metal terminal to the second metal wiring such that a loop from the high-level voltage end to the low-level voltage end is obtained to conductively connect the common electrode layer and the metal terminal.

The above embodiment specifically describes the first metal terminal and the second metal terminal disposed on the two sides of the display region to achieve connection of the common electrode layer and the metal terminal. However, the embodiment of the present application is not limited thereto. For example, to solve a space, the first metal terminal and the second metal terminal can be disposed on one side of the display region. Accordingly, a disposing manner of positive connection terminals and negative connection terminals in the following embodiment can also use a manner of the bridge region on one side of the display region, which is not described repeatedly in the following embodiment.

In an embodiment, with reference to FIGS. 3, the first metal terminal 127b includes a plurality of positive connection terminals (for example, 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 (for examples, a first negative connection terminal 313 and a second negative connection terminal 314). The positive connection terminals are disposed in the bridge region 152 on the two sides of the display region 151. The negative connection terminals are disposed in the bridge region 152 on the two sides of the display region 151. Furthermore, the positive connection terminals are disposed to correspond to the negative connection terminals. By disposing the positive connection terminals and the negative connection terminals, when the common electrode layer and the metal terminal are conductively connected, transmission of different signals can be achieved by conductive connection of the connection terminals, or by the conductive connection of the connection terminals, when connection of a certain metal terminal is broken, conductive connection of the common electrode layer and the metal terminal can still be achieved by other metal terminal.

In an embodiment, with reference to FIGS. 3, the positive connection terminals include a first positive connection terminal 311, a second positive connection terminal 312, the negative connection terminals include a first negative connection terminal 313, a second negative connection terminal 314, the first positive connection terminal 311 and the first negative connection terminal 313 are disposed in bridge region 152 on one side of the display region 151, and the second positive connection terminal 312 and the second negative connection terminal 314 are disposed in the bridge region 152 on the other side of the display region 151. 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. Electrically connecting the first positive connection terminal to the first negative connection terminal on the same side and electrically connecting the second positive connection terminal to the second negative connection terminal on the same side achieve conductive connection of the common electrode layer and the metal terminal.

It should be explained that electrical connection in the embodiment of the present application means that a current moves from an end to another end. Because the first metal terminal and the second metal terminal in the present application are disposed insulatively, electrical connection in the embodiment of the present application includes no physical connection between two ends. For example, the first positive connection terminal electrically connected to the first negative connection terminal means that a current moves from the first positive connection terminal wiring to the first negative connection terminal, or the current moves from the first negative connection terminal wiring to the first positive connection terminal instead of meaning that physical connection between the first positive connection terminal and the first negative connection terminal. Electrical connection in the following embodiment is based on the above description, which is not repeatedly described in the following embodiment.

In an embodiment, the positive connection terminals include a third positive connection terminal and a fourth positive connection terminal, the negative connection terminals include a third negative connection terminal and a fourth negative connection terminal, the third positive connection terminal and the fourth positive connection terminal are disposed in a terminal region on one of the sides of the display region, the third negative connection terminal and the fourth negative connection terminal are disposed in a terminal region on the other side of the display region, 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. Disposing the positive connection terminals in the terminal region on one side of the display region, disposing the negative connection terminals in the terminal region on the other side of the display region, and then connecting the positive connection terminals and the negative connection terminals on the two sides make conductive connection between the common electrode layer and the metal terminal, and also a plurality of connection terminals are connected correspondingly, which achieves multi-conductive conductive connection between the common electrode layer and the metal terminal.

In an embodiment, the positive connection terminals include a fifth positive connection terminals and a sixth positive connection terminals, the negative connection terminals include a fifth negative connection terminals and a sixth negative connection terminals, the fifth positive connection terminals and fifth negative connection terminals are disposed in a terminal region on one of the sides of the display region, the sixth positive connection terminals and the sixth negative connection terminals are disposed in a terminal region on the other side of the display region, the fifth positive connection terminals is electrically connected to the sixth negative connection terminals, and the sixth positive connection terminals is electrically connected to the fifth negative connection terminals. The positive connection terminals and the negative connection terminals are disposed on two sides of the display region and the positive connection terminals and negative connection terminals are electrically connected to achieve conductive connection between the common electrode layer and the metal terminal. Furthermore, correspondingly connecting the connection terminals achieves multi-conductive connection among the common electrode layer and the metal terminal.

The above embodiment describes connection manners in detail with the first positive connection terminal to the sixth positive connection terminal, the first negative connection terminal to the sixth negative connection terminal. However, it should be explained that in the embodiment of the present application first, second to sixth means no specific connection terminal, and under a prerequisite of a plurality of connection manners, multiple connection manners can be used to achieve conductive connection of the metal terminal and the common electrode layer, which is not repeatedly described here.

For the issue that the organic material of the electron injection layer and the electron transport layer cannot conductively connect the metal terminal and the common electrode layer and requires two different mask plates for respectively forming the common electrode layer and the electron injection layer and the electron transport layer to cause a lower manufacturing efficiency of the display device, in an embodiment, a material of the electron injection layer includes an organic material, a material of the electron transport layer includes an organic material, the voltage difference between the high-level voltage end and the low-level voltage end is greater than the turn-on voltage of the electron injection layer and the electron transport layer. when the material of the electron injection layer and the electron transport layer is an organic material, conductivity of the electron injection layer and the electron transport layer is poor, the first metal terminal and the second metal terminal are connected to the high-level voltage end and the low-level voltage end respectively such that the voltage difference between the high-level voltage end and the low-level voltage end is greater than the turn-on voltage of the electron injection layer and the electron transport layer. At this time, the current can strike through the electron injection layer and the electron transport layer, or temperature increase due to a voltage can burn and connect the electron injection layer and the electron transport layer. The material of the metal terminal and the common electrode layer is a conductive material such that the metal terminal and the common electrode layer can be conductively connected such that the common electrode layer and the metal terminal can also be conductively connected when one mask plate is used to form the common electrode layer, the electron injection layer, and the electron transport layer.

In an embodiment, when a voltage is inputted in the high-level voltage end and the low-level voltage end, a temperature of the bridge region ranges from 50° C. to 120° C. Because the electron injection layer and the electron transport layer are organic materials, the electron injection layer and the electron transport layer would be burned and connected when the inputted voltage increases the temperature of the bridge region such that the common electrode layer and the metal terminal bridge region are welded together to achieve conductive connection of the common electrode layer and the metal terminal. Furthermore, between 50° C. and 120° C., the metal terminal and the common electrode layer has better stability without burning and damaging the common electrode layer and the metal terminal due to increase of the temperature and affecting a display effect.

Particularly, a sum of a thickness of the electron injection layer and a thickness of the electron transport layer is less than 200 nm. The thicknesses of the electron injection layer and the electron transport layer are lowered such that the electron injection layer and the electron transport layer can be burned and connected.

For the issue that the organic material of the electron injection layer and the electron transport layer cannot conductively connect the metal terminal and the common electrode layer and requires two different mask plates for respectively forming the common electrode layer and the electron injection layer and the electron transport layer to cause a lower manufacturing efficiency of the display device, in an embodiment, a material of the common electrode layer includes a metal material, and the voltage difference between the high-level voltage end and the low-level voltage end is greater than a first migration voltage of the metal material. The material of the common electrode layer is disposed as the metal material and the voltage difference between the high-level voltage end and the low-level voltage end is greater than the first migration voltage of the metal material such that when a voltage is inputted, metal particles in the common electrode layer would migrate to the electron injection layer and the electron transport layer to improve conductivity of the electron injection layer and the electron transport layer, which achieves conductive connection of the common electrode layer and the metal terminal and improves the manufacturing efficiency of the display panel.

Particularly, the first migration voltage refers to a voltage able to migrate the metal material and conductively connect the metal terminal and the common electrode layer. For example, a voltage of 2 volts can migrate the metal material and conductively connect the metal terminal and the common electrode layer, and the voltage of 2 volts can be set as a first migration voltage.

Particularly, a material of the common electrode layer includes silver or silver alloy because silver has a higher mobility. Using silver as a material of the common electrode layer can improve a migration effect to further enhance a conductive connection effect of the metal terminal and the common electrode layer.

Particularly, for the OLED display panel including a top emission OLED display panel and a bottom emission OLED display panel, the top emission OLED display panel using silver as a common electrode layer would result in an issue of a lowered transmittance. Therefore, the embodiment of the present application, when using silver or silver alloy as a top emission OLED display panel, can have the common electrode layer with a smaller thickness. For example, the thickness of the common electrode layer ranges from 10 nm to 30 nm to guarantee a transmittance of the top emission OLED display panel. For a bottom emission OLED display device, a thicker common electrode layer can be used to improve reflectivity.

In an embodiment, the common electrode layer is set as a single layer. Disposing a single layer reduces the thickness of the common electrode layer and also improves a migration effect of particles such that the common electrode layer and the metal terminal are conductively connected. However, the embodiment of the present application is not limited thereto and the common electrode layer can be set as a multi-layer including one layer formed by silver or silver alloy.

For the issue that the organic material of the electron injection layer and the electron transport layer cannot conductively connect the metal terminal and the common electrode layer and requires two different mask plates for respectively forming the common electrode layer and the electron injection layer and the electron transport layer to cause a lower manufacturing efficiency of the display device, in an embodiment, the material of the electron injection layer includes first conductive material, the material of the electron transport layer includes an organic material, and the voltage difference between the high-level voltage end and the low-level voltage end is greater than a second migration voltage of the electron injection layer. The conductive material serves as a material of the electron injection layer and the voltage difference between the high-level voltage end and the low-level voltage end is greater than the second migration voltage of the electron injection layer such that, conductive particles in the electron injection layer can migrate to the electron transport layer under an effect of an electrical field when a voltage is inputted. Because the common electrode layer and the metal terminal are a conductive material, and the common electrode layer and the metal terminal can be conductively connected when the common electrode layer, the electron injection layer, and the electron transport layer are formed by the same mask plate.

Particularly, the material of the electron injection layer includes lithium and ytterbium.

Particularly, the second migration voltage refers to a voltage migrating the conductive material of the electron injection layer and conductively connect the metal terminal and the common electrode layer. For example, a voltage of 2 volts can migrate the conductive material and conductively connect the metal terminal and the common electrode layer, and the voltage of 2 volts can be set as a second migration voltage.

In an embodiment, a second conductive material is doped in the electron transport layer, and the voltage difference between the high-level voltage end and the low-level voltage end is greater than a third migration voltage of the second conductive material. Doping the conductive material in the electron transport layer makes the conductive material able to migrate to form a closed circuit between the metal terminal and the common electrode layer to conductive connect the common electrode layer and the metal terminal.

Particularly, the third migration voltage refers to a voltage able to migrate the conductive material in the electron transport layer and conductively connect the metal terminal and the common electrode layer. For example, a voltage of 2 volts can migrate the conductive material and conductively connect the metal terminal and the common electrode layer, and the voltage of 2 volts can be set as a third migration voltage.

For the issue that the organic material of the electron injection layer and the electron transport layer cannot conductively connect the metal terminal and the common electrode layer and requires two different mask plates for respectively forming the common electrode layer and the electron injection layer and the electron transport layer to cause a lower manufacturing efficiency of the display device, in an embodiment, the material of the electron injection layer includes an organic material, the material of the electron transport layer includes an organic material, a third conductive material is doped in at least one of the electron injection layer and the electron transport layer, and the voltage difference between the high-level voltage end and the low-level voltage end is greater than a fourth migration voltage of the third conductive material. The electron injection layer and the electron transport layer are doped with the conductive material, and the voltage difference between the high-level voltage end and the low-level voltage end is greater than the migration voltage of the conductive material such that the doped metal forms a similar microscopic metal thin thread when a voltage is inputted to make the electron injection layer and the electron transport layer form a closed circuit to conductively connect the metal terminal and the common electrode layer, and the common electrode layer and the metal terminal can be conductively connected when the common electrode layer, the electron injection layer, and the electron transport layer are formed by the same mask plate to improve a manufacturing efficiency of the OLED display panel.

Particularly, the fourth migration voltage refers to a voltage able to migrate the conductive material in the electron transport layer and conductively connect the metal terminal and the common electrode layer. For example, a voltage of 2 volts can migrate the conductive material and conductively connect the metal terminal and the common electrode layer, and the voltage of 2 volts can be set as a fourth migration voltage.

It should be explained that first conductive material, second conductive material, and third conductive material can be the same material or can be different materials.

It should be explained that the above embodiment specifies the first migration voltage to the fourth migration voltage, and the turn-on voltage explains a voltage under different setting. However, names of the first to fourth and each voltage not only have no limit to a specific value of a certain voltage but also no limit to a certain voltage greater than another voltage. For example, the first migration voltage is not necessarily greater than second migration voltage, the first migration voltage can be the same as the second migration voltage according to a demand, the first migration voltage can also be greater than second migration voltage, and the first migration voltage can also be less than second migration voltage.

It should be explained that the above embodiment uses the electron injection layer of an organic material, the electron transport layer of an organic material, the common electrode layer of a metal material, the electron injection layer of a conductive material, the electron transport layer of an organic material, the electron injection layer and the electron transport layer of an organic material doped with a conductive material as an example for detailed explanation. However, because no conflict exists in some features of the above embodiment, the embodiment of the present application can serve a plurality of features as an embodiment. The embodiment of the present application is not limited by the above embodiment and can combine plurality of features as an embodiment when the features have no conflict to further improve an effect of conductive connection of the common electrode layer and the metal terminal.

Particularly, to explain that a plurality of features can be combined as an embodiment, the embodiment of the present application includes a plurality of combined embodiments but does not enumerate all embodiments. Two embodiments are described in the following embodiment.

In an 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 layer of the electron transport layer and the electron injection layer is doped with a conductive material, and the material of the common electrode layer includes a metal material. The voltage difference between the high-level voltage end and the low-level voltage end is greater than the turn-on voltage of the electron injection layer and the electron transport layer. The electron transport layer and electron injection layer are doped with a conductive material, the material of the common electrode layer includes a metal material, and the voltage difference between the high-level voltage end and the low-level voltage end is greater than the turn-on voltage of the electron injection layer and the electron transport layer such that under an effect of an electrical field, the electron injection layer and the electron transport layer would be burned and connected. Also, metal particles of the common electrode layer and conductive particles in the electron injection layer and/or the electron transport layer would migrate to make the metal terminal and the common electrode layer conductively connected through a plurality of manners such that the common electrode layer and the metal terminal can be conductively connected when the common electrode layer, the electron injection layer and the electron transport layer are formed by the same mask plate, which improves a manufacturing efficiency of the OLED display panel.