CN114023790A

CN114023790A - Display panel and display terminal

Info

Publication number: CN114023790A
Application number: CN202111210443.XA
Authority: CN
Inventors: 肖翔
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2022-02-08
Anticipated expiration: 2041-10-18
Also published as: CN114023790B

Abstract

The application relates to a display panel and a display terminal, wherein the display panel comprises a cathode, an auxiliary cathode and a plurality of auxiliary cathode contact holes, the cathode is connected with the auxiliary cathode through the auxiliary cathode contact holes, the cathode comprises a first wire, a second wire, a third wire and a fourth wire, the first wire, the second wire, the third wire and the fourth wire are connected with each other, the first wire and the third wire are arranged along a first direction, the second wire and the fourth wire are arranged along a second direction, and the first direction is different from the second direction; the auxiliary cathode comprises a plurality of fifth wires, and at least one of the fifth wires is arranged along the first direction. Through will many fifth walk at least one fifth in the line edge in display panel the first direction sets up, the influence that weakens the cathode voltage decline that this application can be better promotes the homogeneity that display panel shows.

Description

Display panel and display terminal

Technical Field

The application relates to the technical field of display, in particular to a display panel and a display terminal.

Background

Display panels (for example, self-light emitting display panels) mainly include a bottom emission type (emitting light downward with respect to a substrate) and a top emission type (emitting light upward with respect to a substrate). For example, the self-Light Emitting display panel may be an Organic Light-Emitting Diode (OLED) display panel, and the OLED device may be fixed on a substrate of the display panel. In the top-emitting OLED display panel, light can be emitted from the upper part of the OLED device without passing through the substrate, so that the light-emitting area of the OLED device cannot be influenced by the circuit design on the substrate, and the influence of other devices on the substrate on the light-emitting area of the OLED device is reduced.

In the related art, in a self-luminous panel, especially a top emission type self-luminous panel, a cathode of a light emitting device generally employs an extremely thin metal layer to obtain an extremely high transmittance. However, the extremely thin metal itself has a large resistance, which causes a voltage Drop (i.e., IR Drop) phenomenon of the cathode voltage, thereby causing display unevenness of the display panel.

For example, fig. 1 shows a schematic view of a display panel in the related art. Referring to fig. 1, the display panel includes a cathode (i.e., a face cathode), an auxiliary cathode, a cathode contact hole, and an OLED device (not shown). The auxiliary cathode includes a plurality of auxiliary cathode lines. The auxiliary cathode and the cathode are connected through a plurality of auxiliary cathode contact holes.

It should be noted that the display panel may further include a substrate for supporting the cathode, the auxiliary cathode, the cathode contact hole, and the OLED device. The components of the display panel shown in fig. 1 may be located on different layers, and thus, the display panel shown in fig. 1 may be a graph obtained by orthographically projecting the components of the display panel on a horizontal plane, which may also be referred to as a projection plane.

Further, the outermost frame line in fig. 1 may be the inner edge of the cathode. The cathode in fig. 1 may also extend from the inner edge of the cathode all around to the outer edge of the cathode (not shown), i.e. the size of the cathode in the projection plane may be the size of the area enclosed by the inner edge of the cathode and the outer edge of the cathode.

It can be seen that in fig. 1, the cathode includes four sides, the lowermost of which may be grounded (i.e., the planar cathode VSS input). And taking the edge of the grounded cathode as a reference, and longitudinally arranging each auxiliary cathode line, namely enabling the trend of each auxiliary cathode line to be vertical to the edge of the grounded cathode. In addition, the auxiliary cathode voltage provided on each auxiliary cathode is set to VSS1 in fig. 1, that is, the auxiliary cathode voltage provided on each auxiliary cathode is the same.

Since the cathode is made of an extremely thin metal layer and has a high impedance, the arrangement of the auxiliary cathode and the cathode according to fig. 1 results in a higher voltage at the periphery of the inner edge of the cathode than at the periphery of the outer edge of the cathode, i.e. the voltage at the cathode becomes gradually higher in the direction from the outer edge of the cathode to the inner edge of the cathode. For example, fig. 2 is a diagram illustrating a voltage drop value of a display panel in the related art. In fig. 2, the x-direction may be a direction along one side of the grounded cathode, the y-direction may be a direction along an outer edge of the cathode to an inner edge of the cathode, and the entire gray region may be a portion of one side of the grounded cathode. It can be seen that the voltage at different positions of the cathode is also different. The voltage drop phenomenon is more serious the closer the position to the inner edge of the cathode is, the larger the voltage is.

Therefore, the voltage drop phenomenon is very serious due to the arrangement of the auxiliary cathode and the cathode in the related art, and further the brightness drop at different positions in the display panel is more obvious, and the overall uniformity of the display panel is still not ideal.

Disclosure of Invention

In view of this, the present application provides a display panel and a display terminal, which can better weaken the effect of cathode voltage drop and improve the display uniformity of the display panel.

According to an aspect of the present application, a display panel is provided, where the display panel includes a cathode, an auxiliary cathode, and a plurality of auxiliary cathode contact holes, the cathode is connected to the auxiliary cathode through the plurality of auxiliary cathode contact holes, where the cathode includes a first wire, a second wire, a third wire, and a fourth wire, the first wire, the second wire, the third wire, and the fourth wire are connected to each other, the first wire and the third wire are all arranged along a first direction, the second wire and the fourth wire are all arranged along a second direction, and the first direction is different from the second direction; the auxiliary cathode comprises a plurality of fifth wires, and at least one of the fifth wires is arranged along the first direction.

Further, each fifth routing wire is arranged along the first direction.

Further, the first traces are grounded, and a distance between each fifth trace and the first trace is associated with an auxiliary cathode voltage configured by the fifth trace.

Further, the distance between each fifth trace and the first trace is inversely proportional to the auxiliary cathode voltage configured by the fifth trace.

Further, when the distance between the fifth wire and the first wire is a first preset distance, the auxiliary cathode voltage configured for the fifth wire is a first preset voltage; when the distance between the fifth wire and the first wire is a second preset distance, the auxiliary cathode voltage configured on the fifth wire is a second preset voltage, wherein the first preset distance is greater than the second preset distance, and the first preset voltage is less than the second preset voltage.

Further, a plurality of groups are arranged in the fifth wires, each group includes at least one fifth wire, and the fifth wires in the same group are configured with the same auxiliary cathode voltage.

Further, a distance of each of the groups from the first trace is associated with an auxiliary cathode voltage of any fifth trace configuration of the group.

Furthermore, each fifth wire is correspondingly provided with a row of auxiliary cathode contact holes.

Further, the shape of the auxiliary cathode contact holes includes at least one of a square shape, a circular shape, an oval shape, a regular polygon shape, and an irregular pattern.

According to another aspect of the present application, there is provided a display terminal including a terminal body and the display panel connected with the terminal body.

Through will many fifth walk at least one fifth in the line to walk in display panel and walk the line along the setting of first direction, can be better according to the influence that weakens the cathode voltage decline of each aspect of this application, promote the homogeneity that display panel shows.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 illustrates a schematic diagram of a display panel in the related art.

Fig. 2 is a diagram illustrating a voltage drop value of a display panel in the related art.

Fig. 3 shows a schematic diagram of a display panel according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.

The application provides a display panel, which comprises a cathode, an auxiliary cathode and a plurality of auxiliary cathode contact holes, wherein the cathode is connected with the auxiliary cathode through the auxiliary cathode contact holes, the cathode comprises a first wire, a second wire, a third wire and a fourth wire, the first wire, the second wire, the third wire and the fourth wire are connected with each other, the first wire and the third wire are arranged along a first direction, the second wire and the fourth wire are arranged along a second direction, and the first direction is different from the second direction; the auxiliary cathode comprises a plurality of fifth wires, and at least one of the fifth wires is arranged along the first direction. At least one fifth wire of the plurality of fifth wires is arranged along the first direction in the display panel, so that the influence of cathode voltage reduction can be better weakened, and the display uniformity of the display panel is improved.

As shown in fig. 3, the display panel includes a cathode, an auxiliary cathode, and a plurality of auxiliary cathode contact holes, the cathode is connected to the auxiliary cathode through the plurality of auxiliary cathode contact holes, wherein the cathode includes a first trace 211, a second trace 212, a third trace 213, and a fourth trace 214, the first trace 211, the second trace 212, the third trace 213, and the fourth trace 214 are connected to each other, the first trace 211 and the third trace 213 are both disposed along a first direction, the second trace 212 and the fourth trace 214 are both disposed along a second direction, and the first direction is different from the second direction; the auxiliary cathode comprises a plurality of fifth wires, and at least one of the fifth wires is arranged along the first direction.

In fig. 3, the auxiliary cathode contact hole 231 may be any one of the auxiliary cathode contact holes, and the fifth wire 225 may be any one of the fifth wires. Each trace may be a metal trace.

It should be noted that, components of the display panel in fig. 3 are similar to components of the display panel in fig. 1, for example, the cathode, the auxiliary cathode, and the plurality of auxiliary cathode contact holes in fig. 3 are also actually located in different layers, the display panel shown in fig. 3 may be a pattern obtained by orthographically projecting the components in the display panel on a horizontal plane, which may also be referred to as a projection plane, and the similar components will not be described again.

In addition, the cathode may be a cathode in an OLED device in a display panel, and the display panel further includes a plurality of sub-pixel units, and one OLED device is disposed in each sub-pixel unit. Each OLED device may also include an anode, a liquid crystal layer, etc. (not shown in fig. 3). Since the cathodes of the plurality of OLED devices may be commonly grounded, the cathodes may also be referred to as planar cathodes, meaning a common ground for the entire display panel.

In one example, the cathode includes an inner edge and an outer edge. The shape of the inner edge of the cathode and the shape of the outer edge of the cathode may both be provided as rectangles. The shape of the inner edge of the cathode and the shape of the outer edge of the cathode may be set to other shapes such as a trapezoid, and the shape of the inner edge of the cathode and the shape of the outer edge of the cathode are not limited in the present application.

Further, the first wire, the second wire, the third wire, the fourth wire and the fifth wire may be straight lines, and the widths of the straight lines may be preset. The widths of the first wire, the second wire, the third wire, the fourth wire and the fifth wire are not limited in the present application.

In addition, the first trace, the second trace, the third trace, the fourth trace and the fifth trace may also be curved lines. When the first trace, the second trace, the third trace, the fourth trace, and the fifth trace are curves, both the first direction and the second direction may be tangential directions of a mass point on the curves. The present application is not limited to the specific meanings of the first direction and the second direction.

Further, the first direction is different from the second direction. For example, the first direction and the second direction may be perpendicular to each other. In fig. 3, the second trace is perpendicular to the first trace. For another example, the first direction and the second direction may intersect. It should be understood by those skilled in the art that the first direction and the second direction may be variously modified in the light of the embodiments of the present application, and the present application is not limited to the relationship between the first direction and the second direction.

Further, at least one fifth wire of the fifth wires is disposed along the first direction. For example, the auxiliary cathode includes three fifth traces, one of the three fifth traces may be disposed along the first direction, and the remaining two of the three fifth traces may be disposed along other directions. The number of the fifth traces arranged along the first direction is not limited in the present application.

Further, each fifth routing wire is arranged along the first direction. That is, all the fifth wires are disposed along the first direction, and the plurality of fifth wires may be parallel to each other.

Further, the first trace is grounded. And under the condition that the first wire is grounded, the first wire is provided with an input end of the cathode. The input of the cathode may be a pad or an interface, which may be connected to a common ground in the display panel.

Further, the distance between each fifth trace and the first trace is associated with the auxiliary cathode voltage of the fifth trace configuration. It should be noted that, because each of the fifth wires and the first wire may be located on different layers, a distance between each of the fifth wires and the first wire may be a distance between an orthographic projection of each of the fifth wires on the projection plane and an orthographic projection of the first wire on the projection plane. In addition, the actual distance between each fifth trace and the first trace may also be used to represent the distance between each fifth trace and the first trace. It should be understood by those skilled in the art that the distance between each of the fifth traces and the first trace can be expressed in various ways, and how to express the distance between each of the fifth traces and the first trace is not limited in the present application.

Further, the distance between each fifth trace and the first trace is inversely proportional to the auxiliary cathode voltage configured by the fifth trace. For example, the larger the distance between each fifth trace and the first trace is, the lower the auxiliary cathode voltage of the fifth trace configuration is.

According to the display panel, the voltage drop phenomenon of the distance away from the first wire can be weakened according to the embodiment of the application, so that the overall voltage drop of the display panel is closer, and the uniformity of panel display is improved.

Further, when the distance between the fifth wire and the first wire is a first preset distance, the auxiliary cathode voltage configured for the fifth wire is a first preset voltage; when the distance between the fifth wire and the first wire is a second preset distance, the auxiliary cathode voltage configured on the fifth wire is a second preset voltage, wherein the first preset distance is greater than the second preset distance, and the first preset voltage is less than the second preset voltage. For example, the first preset distance may be 5mm, and the second preset distance may be 3 mm. The auxiliary cathode voltage configured for the fifth wire corresponding to the first preset distance may be 0.2V (i.e., a first preset voltage), and the auxiliary cathode voltage configured for the fifth wire corresponding to the second preset distance may be 0.4V (i.e., a second preset voltage). For another example, the distance between every two fifth wires may be equal, and the auxiliary cathode voltage disposed on each fifth wire may form an arithmetic progression. How to set the first preset voltage, the second preset voltage, the first preset distance and the second preset distance is not limited in the present application.

Further, a plurality of groups are arranged in the fifth wires, each group includes at least one fifth wire, and the fifth wires in the same group are configured with the same auxiliary cathode voltage. For example, in the case that the number of the plurality of fifth traces is 256, the 256 fifth traces may be divided into 32 groups, each group including 8 fifth traces. For the 8 fifth traces in each group, the auxiliary voltages configured on the respective auxiliary cathodes are the same.

Further, the distance between each group and the first trace is associated with the auxiliary cathode voltage configured by any fifth trace of the group, that is, the auxiliary cathode voltages configured by the fifth traces in different groups may be different. The distance between each group and the first trace may be the distance between any fifth trace in the group and the first trace. It should be understood by those skilled in the art that the application is not limited to how to configure the auxiliary cathode voltage of the fifth trace in each group.

Through grouping many fifth wires and adjusting every fifth auxiliary cathode voltage of walking the line configuration according to grouping, can reduce the quantity of the auxiliary cathode voltage of walking the line configuration to a plurality of fifth, reduce the configuration degree of difficulty of auxiliary cathode voltage, simple and convenient.

Furthermore, each fifth wire is correspondingly provided with a row of auxiliary cathode contact holes. In practical application, each of the fifth wires is located in the same layer, and an insulating layer is further disposed on the layer where the fifth wires are located. A row of auxiliary cathode contact holes disposed corresponding to one fifth wire may be disposed in the insulating layer. Preferably, each auxiliary cathode contact hole may be provided as a via hole in the insulating layer. In addition, the auxiliary cathode contact holes in each row may have the same direction as the fifth traces. For example, each row of auxiliary cathode contact holes may be disposed along the first direction, and distances between the auxiliary cathode contact holes in the same row may be equal.

Furthermore, a plurality of auxiliary cathode contact holes are further formed in the display panel and used for communicating the auxiliary cathodes with the surface cathode, wherein the shape of the auxiliary cathode contact holes at least comprises one of square, circle, ellipse, regular polygon and irregular figure. In addition, the number and the positions of the auxiliary cathode contact holes can be adjusted according to actual needs, so long as the influence of the voltage drop phenomenon is reduced, and the shape, the number and the positions of the auxiliary cathode contact holes are not limited.

In addition, the application provides a display terminal, display terminal include the terminal main part with display panel, display panel with the terminal main part is connected.

To sum up, this application embodiment is through in display panel with many fifth walk at least one fifth in the line edge the first direction sets up, the influence that weakens the cathode voltage decline that can be better promotes the homogeneity that display panel shows, is particularly useful for the display panel of jumbo size top emission type.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The display driving device, the display screen and the short-circuit prevention method provided by the embodiment of the application are described in detail above, a specific example is applied in the description to explain the principle and the implementation of the application, and the description of the embodiment is only used for helping to understand the technical scheme and the core idea of the application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A display panel comprising a cathode, an auxiliary cathode, and a plurality of auxiliary cathode contact holes through which the cathode is connected to the auxiliary cathode, wherein,

the cathode comprises a first wire, a second wire, a third wire and a fourth wire, the first wire, the second wire, the third wire and the fourth wire are connected with each other, the first wire and the third wire are arranged along a first direction, the second wire and the fourth wire are arranged along a second direction, and the first direction is different from the second direction;

the auxiliary cathode comprises a plurality of fifth wires, and at least one of the fifth wires is arranged along the first direction.

2. The display panel according to claim 1, wherein each of the fifth traces is disposed along the first direction.

3. The display panel according to claim 1, wherein the first traces are grounded, and a distance between each of the fifth traces and the first trace is associated with an auxiliary cathode voltage of the fifth trace configuration.

4. The display panel according to claim 3, wherein a distance between each of the fifth traces and the first trace is inversely proportional to an auxiliary cathode voltage of the fifth trace configuration.

5. The display panel according to claim 4, wherein when the distance between the fifth wire and the first wire is a first predetermined distance, the auxiliary cathode voltage configured for the fifth wire is a first predetermined voltage;

when the distance between the fifth wire and the first wire is a second preset distance, the auxiliary cathode voltage configured for the fifth wire is a second preset voltage,

the first preset distance is greater than the second preset distance, and the first preset voltage is smaller than the second preset voltage.

6. The display panel according to claim 3, wherein a plurality of groups are disposed in the fifth traces, each group includes at least one fifth trace, and the fifth traces in a same group are configured with the same auxiliary cathode voltage.

7. The display panel of claim 6, wherein the distance of each of the groups from the first trace is associated with an auxiliary cathode voltage of any fifth trace configuration of the group.

8. The display panel according to claim 1, wherein each of the fifth traces is correspondingly provided with a row of auxiliary cathode contact holes.

9. The display panel of claim 1, wherein the shape of the auxiliary cathode contact holes comprises at least one of a square shape, a circular shape, an elliptical shape, a regular polygonal shape, and an irregular shape.

10. A display terminal, characterized in that the display terminal comprises a terminal body and a display panel according to any one of claims 1 to 9, the display panel being connected to the terminal body.