CN114023790B

CN114023790B - Display panel and display terminal

Info

Publication number: CN114023790B
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: 2023-05-30
Anticipated expiration: 2041-10-18
Also published as: CN114023790A

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 plurality of auxiliary cathode contact holes, the cathode comprises a first wiring, a second wiring, a third wiring and a fourth wiring, the first wiring, the second wiring, the third wiring and the fourth wiring are mutually connected, the first wiring and the third wiring are all arranged along a first direction, the second wiring and the fourth wiring 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 fifth wire in the plurality of fifth wires is arranged along the first direction. Through with at least one fifth wiring in the plurality of fifth wirings along in display panel the first direction sets up, and the influence that the cathode voltage descends is reduced that this application can be better, promotes display panel and shows the homogeneity.

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

A display panel (e.g., a self-luminous display panel) mainly includes a bottom emission type (light emitting downward with respect to a substrate) and a top emission type (light emitting upward with respect to the substrate). For example, the self-luminous 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-emission 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-light emitting panel, particularly a top emission type self-light emitting 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, and causes a voltage Drop (i.e., IR Drop) phenomenon of a cathode voltage, thereby causing display unevenness of the display panel.

For example, fig. 1 shows a schematic diagram 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, an OLED device (not shown), and the like. The auxiliary cathode includes a plurality of auxiliary cathode lines. The auxiliary cathode is connected with the cathode 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 of fig. 1 may be located in different layers, and thus the display panel shown in fig. 1 may be a figure obtained by orthographically projecting the components of the display panel on a horizontal plane, which may also be referred to as a projection plane.

In addition, the outermost wire 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 to the outer edge of the cathode (not shown), i.e. the size of the cathode on the projection surface 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, wherein the lowermost side may be grounded (i.e., face cathode VSS input). And taking the grounded side of the cathode as a reference, and longitudinally arranging each auxiliary cathode line, namely, arranging each auxiliary cathode line in a direction perpendicular to the grounded side of the 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, the impedance is relatively high, and thus, the arrangement of the auxiliary cathode and the cathode according to fig. 1 results in the voltage at the periphery of the inner edge of the cathode being higher than the voltage at the periphery of the outer edge of the cathode, i.e., the voltage at the cathode gradually increases in the direction from the outer edge of the cathode to the inner edge of the cathode. For example, fig. 2 shows a schematic diagram of a voltage drop value of a display panel in the related art. In fig. 2, the x-direction may be a direction along which one side of the grounded cathode is located, 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 area may be a portion of one side of the grounded cathode. It can be seen that the voltages at the different locations of the cathode are also different. The voltage drop phenomenon is more serious as the voltage is greater at a position closer to the inner edge of the cathode.

Therefore, the voltage drop phenomenon is serious due to the arrangement of the auxiliary cathode and the cathode in the related art, so that the brightness drop of 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 application provides a display panel and a display terminal, which can better weaken the influence of cathode voltage drop and promote the uniformity of display panel display.

According to an aspect of the present application, there is provided a display panel, the display panel including a cathode, an auxiliary cathode, and a plurality of auxiliary cathode contact holes, the cathode being connected to the auxiliary cathode through the plurality of auxiliary cathode contact holes, wherein the cathode includes a first trace, a second trace, a third trace, and a fourth trace, the first trace, the second trace, the third trace, and the fourth trace are connected to each other, the first trace and the third trace are all disposed along a first direction, the second trace and the fourth trace are all 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 fifth wire in the plurality of fifth wires is arranged along the first direction.

Further, each of the fifth wires is disposed along the first direction.

Further, the first wires are grounded, and the distance between each fifth wire and the first wire is related to the auxiliary cathode voltage of the fifth wire configuration.

Further, a distance between each of the fifth wires and the first wire is inversely proportional to an auxiliary cathode voltage of the fifth wire configuration.

Further, when the distance between the fifth wire and the first wire is a first preset distance, the auxiliary cathode voltage configured by 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 by 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 comprises at least one fifth wire, and the fifth wires in the same group are configured with the same auxiliary cathode voltage.

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

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

Further, the shapes of the plurality of auxiliary cathode contact holes at least include one of square, round, oval, regular polygon and 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 with at least one fifth wiring in the plurality of fifth wirings along the first direction setting in display panel, according to the each aspect of this application, the influence that reduces the cathode voltage that can be better weakens promotes the homogeneity that display panel shows.

Drawings

Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.

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

Fig. 2 is a schematic diagram showing 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 will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials. In some instances, methods, means, elements, and circuits have not been described in detail as not to unnecessarily obscure the present application.

The application provides a display panel, the display panel includes negative pole, auxiliary negative pole and a plurality of auxiliary negative pole contact hole, the negative pole pass through a plurality of auxiliary negative pole contact holes with auxiliary negative pole links to each other, wherein, the negative pole includes first line, second line, third line and fourth line of walking, first line, second line, third line and fourth line interconnect of walking, first line with the third line all sets up along first direction, the second line with the fourth line all sets up along the second direction, first direction is different with the second direction; the auxiliary cathode comprises a plurality of fifth wires, and at least one fifth wire in the plurality of fifth wires is arranged along the first direction. Through setting at least one fifth wire in a plurality of fifth wires along the first direction in the display panel, the influence of cathode voltage drop can be better weakened, and the uniformity of display panel display 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 all disposed along a first direction, the second trace 212 and the fourth trace 214 are all 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 fifth wire in the plurality of fifth wires is arranged along the first direction.

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

It should be noted that, the components of the display panel in fig. 3 are similar to those 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 actually located in different layers, and the display panel shown in fig. 3 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, and similar parts will not be repeated.

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, each having one OLED device disposed therein. Each OLED device may also include an anode, a liquid crystal layer, etc. (not shown in fig. 3). Since the cathodes of multiple OLED devices may be commonly grounded, the cathode may also be referred to as a face cathode, representing 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 be set to be rectangular. 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 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 this application.

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

In addition, the first trace, the second trace, the third trace, the fourth trace, and the fifth trace may be curved. In the case where the first trace, the second trace, the third trace, the fourth trace, and the fifth trace are curved lines, the first direction and the second direction may each be tangential to a particle on the curved line. The specific meaning of the present application for the first direction and the second direction is not limited.

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. As another example, the first direction and the second direction may intersect. It will be appreciated by those skilled in the art that many variations of the first direction and the second direction are possible 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 of the plurality of fifth wires is disposed along the first direction. For example, the auxiliary cathode includes three fifth wires, one of the three fifth wires may be disposed along the first direction, and the remaining two of the three fifth wires may be disposed along other directions. The present application is not limited to the number of fifth wirings disposed along the first direction.

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

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

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

By setting the distance between each fifth wire and the first wire to be related to the auxiliary cathode voltage configured by the fifth wire and setting the distance between each fifth wire and the first wire to be inversely proportional to the auxiliary cathode voltage configured by the fifth wire, the voltage drop phenomenon of the distance away from the first wire can be weakened according to the embodiment of the application, and the voltage drop of the whole display panel is enabled to be relatively close, so that 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 by 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 by 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 3mm. The auxiliary cathode voltage configured by 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 by the fifth wire corresponding to the second preset distance may be 0.4V (i.e., a second preset voltage). For another example, the distances between every two fifth wires may be equal, and the auxiliary cathode voltages disposed on each of the fifth wires may form an arithmetic progression. The present application is not limited to how to set the first preset voltage, the second preset voltage, the first preset distance, and the second preset distance.

Further, a plurality of groups are arranged in the fifth wires, each group comprises 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 where the number of the plurality of fifth wires is 256, 256 fifth wires may be divided into 32 groups, each group including 8 fifth wires. The auxiliary voltages provided on the respective auxiliary cathodes are the same for the 8 fifth tracks within each group.

Further, the distance between each of the groups and the first wire is associated with the auxiliary cathode voltage configured by any of the fifth wires of the group, i.e. the auxiliary cathode voltages configured by the respective fifth wires within different groups may be different. The distance between each group and the first wire can be the distance between any fifth wire in the group and the first wire. It will be appreciated by those skilled in the art that the present application is not limited to how the auxiliary cathode voltage of the fifth trace in each group is configured.

The auxiliary cathode voltages configured by the fifth wires are grouped and regulated according to the grouping, so that the number of the auxiliary cathode voltages configured by the fifth wires can be reduced, the difficulty in configuring the auxiliary cathode voltages is reduced, and the method is simple and convenient.

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

Further, a plurality of auxiliary cathode contact holes are further formed in the display panel and are used for communicating the auxiliary cathode with the surface cathode, wherein the shapes of the plurality of auxiliary cathode contact holes at least comprise one of square, round, elliptic, regular polygonal and irregular patterns. In addition, the number and the positions of the plurality of 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 shapes, the numbers and the positions of the plurality of auxiliary cathode contact holes are not limited.

In addition, the application provides a display terminal, which comprises a terminal main body and the display panel, wherein the display panel is connected with the terminal main body.

In summary, in the embodiment of the present application, at least one fifth wire among a plurality of fifth wires is disposed along the first direction in the display panel, which can better weaken the influence of the cathode voltage drop, promote the uniformity of display of the display panel, and is particularly suitable for a large-size top-emission display panel.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, 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, specific examples are applied to the description of the principle and the implementation of the application, and the description of the above embodiments 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 appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The display panel is characterized by comprising a cathode, an auxiliary cathode and a plurality of auxiliary cathode contact holes, wherein the cathode is connected with the auxiliary cathode through the plurality of auxiliary cathode contact holes, the cathode is a surface cathode and is used for representing the common ground of the whole display panel,

the cathode comprises a first wire, a second wire, a third wire and a fourth wire, wherein the first wire, the second wire, the third wire and the fourth wire are mutually connected, 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 and the second direction are different;

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

the first wires are grounded, the distance between each fifth wire and the first wire is related to the auxiliary cathode voltage configured by the fifth wire, and the distance between each fifth wire and the first wire is inversely proportional to the auxiliary cathode voltage configured by the fifth wire.

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

3. The display panel according to claim 1, wherein when the distance between the fifth wire and the first wire is a first preset distance, the auxiliary cathode voltage of 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 by 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 less than the second preset voltage.

4. The display panel of claim 1, wherein each of the fifth wires is provided with a row of auxiliary cathode contact holes.

5. The display panel of claim 1, wherein the shape of the plurality of auxiliary cathode contact holes comprises at least one of a square, a circle, an ellipse, a regular polygon, and an irregular pattern.

6. A display terminal comprising a terminal body and the display panel according to any one of claims 1 to 5, the display panel being connected to the terminal body.