CN110061152B - OLED display panel preparation method, OLED display panel and display device - Google Patents
OLED display panel preparation method, OLED display panel and display device Download PDFInfo
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Abstract
The embodiment of the invention discloses a preparation method of an OLED display panel, the OLED display panel and a display device. The preparation method of the OLED display panel comprises the following steps: forming a planar cathode and an in-plane auxiliary cathode on a substrate; dividing the in-plane auxiliary cathode into a plurality of blocks; and sequentially taking one of the blocks as a target block, and respectively applying different voltages to the target block and other blocks except the target block in the blocks to burn through and conduct the target block, wherein after all the blocks are burnt through and conducted, the face cathode is electrically connected with the in-face auxiliary cathode. In the embodiment of the invention, the mode of partitioning the Burn in by the opposite auxiliary cathode is utilized, so that the problem of poor effect of the Burn in of the middle contact hole of the panel can be effectively solved, the voltage drop condition of the OLED display panel is effectively improved, and the display performance of the OLED display panel is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to an OLED display panel, a preparation method of the OLED display panel and a display device.
Background
Most of the currently mainstream Organic Light-Emitting Diode (OLED) displays are top-emission structures, which require that the conventional surface cathode of the OLED needs to have sufficient Light-transmitting properties. This requirement results in the need for special materials or relatively thin film thickness for the front cathode, which results in large resistance of the front cathode and causes severe display Drop (IR Drop) phenomenon. In order to solve the voltage Drop (IR Drop) caused by such a situation, the top emission structure OLED mostly uses an in-plane auxiliary cathode, and the voltage Drop caused by the cathode is reduced by overlapping and connecting the in-plane auxiliary cathode in parallel with the in-plane cathode.
Since each layer of the OLED device needs to be evaporated before the evaporation of the surface cathode, the overlap resistance of the overlap via between the surface cathode and the in-plane auxiliary cathode is increased or insulated by the layer of the OLED device evaporated, which requires applying a voltage between the surface cathode and the in-plane auxiliary cathode to turn on the Burn-in connection. Because the voltage input of the face cathode and the auxiliary cathode in the face is all around, the contact hole on the edge is firstly conducted to cause shunt voltage drop, so that the effect of the contact hole in the middle of the panel is poor, and the problem of voltage drop cannot be effectively solved.
Disclosure of Invention
The embodiment of the invention provides a preparation method of an OLED display panel, the OLED display panel and a display device, wherein the problem of poor effect of a middle contact hole Burn in of the panel can be effectively solved by utilizing a mode of partitioning the Burn in of an opposite auxiliary cathode, the voltage drop condition of the OLED display panel is effectively improved, and the display performance of the OLED display panel is improved.
In order to solve the above problem, in a first aspect, the present application provides a method for manufacturing an OLED display panel, where the method for manufacturing an OLED display panel includes:
forming a planar cathode and an in-plane auxiliary cathode on a substrate;
dividing the in-plane auxiliary cathode into a plurality of blocks;
and sequentially taking one of the blocks as a target block, respectively applying different voltages to the target block and other blocks except the target block in the blocks to burn through and conduct the target block, and electrically connecting the face cathode with the in-face auxiliary cathode after the burn-through and conduction of all the blocks are completed.
Further, the sequentially taking one of the blocks as a target block, applying different voltages to the target block and other blocks except the target block in the blocks to make the target block burn through and conduct, and electrically connecting the face cathode with the in-plane auxiliary cathode after completing the burn through and conduct of all the blocks includes:
applying a voltage of X volts to the face cathode;
sequentially taking one of the blocks as a target block, applying a voltage of 0V to the auxiliary cathodes in the target block, and applying a voltage of X V to the in-plane auxiliary cathodes in the rest blocks except the target block in the blocks to burn through and conduct the target block, wherein the in-plane cathodes are electrically connected with the in-plane auxiliary cathodes after the burn through and conduction of all the blocks are completed;
wherein X is a non-zero value.
Further, the sequentially taking one of the blocks as a target block, applying different voltages to the target block and other blocks except the target block in the blocks to make the target block burn through and conduct, and electrically connecting the face cathode with the in-plane auxiliary cathode after completing the burn through and conduct of all the blocks includes:
applying a voltage of Y volts to the face cathode;
sequentially taking one of the blocks as a target block, applying a voltage of 0V to the auxiliary cathodes in the target block, and applying a floating voltage to the in-plane auxiliary cathodes in the rest blocks except the target block to burn through the target block, so that the target block is electrically connected with the in-plane auxiliary cathodes after the burn through conduction of all the blocks is completed;
wherein Y is a non-zero value and the floating voltage is a non-zero value.
Further, X is less than 20V.
Further, the forming of the planar cathode and the in-plane auxiliary cathode on the substrate includes:
forming an in-plane auxiliary cathode in a display area on a substrate;
forming an OLED vapor-deposited film layer on the substrate with the in-plane auxiliary cathode;
and forming a surface cathode on the OLED vapor deposition film layer on the substrate on which the OLED vapor deposition film layer is formed.
Further, the preparation method of the OLED display panel further includes:
when the in-plane auxiliary cathode is divided into a plurality of blocks, a corresponding voltage input terminal and a plane cathode input terminal are provided for each block.
In a second aspect, the present application provides an OLED display panel, which is prepared by the method for preparing an OLED display panel according to any one of the first aspect.
In a third aspect, the present application provides an OLED display panel comprising:
a substrate;
the in-plane auxiliary cathode, the OLED vapor-deposited film layer and the surface cathode are sequentially arranged on the substrate and positioned in the display area;
the in-plane auxiliary cathode is divided into a plurality of blocks, at least one connecting channel is arranged on the OLED evaporation coating layer, and the in-plane auxiliary cathode is electrically connected with the in-plane auxiliary cathode at the position of the connecting channel.
Further, each of the plurality of blocks is provided with a corresponding voltage input terminal and a face cathode input terminal.
In a fourth aspect, the present application also provides a display device comprising the OLED display panel according to any one of the second or third aspects.
According to the preparation method of the OLED display panel, the surface cathode and the in-plane auxiliary cathode are formed on the substrate; dividing the in-plane auxiliary cathode into a plurality of blocks; and sequentially taking one of the blocks as a target block, and respectively applying different voltages to the target block and other blocks except the target block in the blocks to burn through and conduct the target block, wherein after all the blocks are burnt through and conducted, the face cathode is electrically connected with the in-face auxiliary cathode. In the embodiment of the invention, the mode of partitioning the Burn in by the opposite auxiliary cathode is utilized, so that the problem of poor effect of the Burn in of the middle contact hole of the panel can be effectively solved, the voltage drop condition of the OLED display panel is effectively improved, and the display performance of the OLED display panel is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional bonding and input method between a planar cathode and an in-plane auxiliary cathode;
FIG. 2 is a schematic view showing unevenness after a conventional overlap and input method between a planar cathode and an in-plane auxiliary cathode;
FIG. 3 is a schematic flow chart illustrating an embodiment of a method for fabricating an OLED display panel according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an in-plane auxiliary cathode divided into a plurality of blocks according to an embodiment of the present invention;
FIG. 5 is a schematic view of the embodiment of the present invention after the overlap joint and input between the in-plane cathode and the in-plane auxiliary cathode;
FIG. 6 is a schematic structural diagram of a portion of an OLED display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
In the description of the present invention, 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", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. 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 invention, "a plurality" means two or more unless specifically defined otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
In the embodiment of the invention, the OLED display panel is a top-emission OLED display panel, and the surface cathode of the top-emission OLED display panel is made of a transparent conductive material. When current flows through the face cathode, a relatively large voltage drop occurs due to the relatively large impedance of the cathode material itself. Therefore, the overlap via between the planar cathode and the in-plane auxiliary cathode is subject to increased overlap resistance or insulation caused by the film layer of the evaporated OLED device, which requires applying a voltage between the planar cathode and the in-plane auxiliary cathode to make Burn-in (Burn-through connection) conduction. As shown in fig. 1, which is a schematic diagram of the overlapping and input manner between the conventional surface cathode and the in-surface auxiliary cathode, in fig. 1, since the voltage input of the surface cathode and the in-surface auxiliary cathode are all around, there is a problem that the edge contact hole turns on first to cause shunt voltage drop, so that the effect of the middle contact hole Burn in of the panel is not good, and particularly as shown in fig. 2, the display is uneven, and the problem of voltage drop cannot be effectively solved.
Accordingly, embodiments of the present invention provide a method for manufacturing an OLED display panel, an OLED display panel and a display device, which are described in detail below.
First, an embodiment of the present invention provides a method for manufacturing an OLED display panel, where the method for manufacturing an OLED display panel includes:
forming a planar cathode and an in-plane auxiliary cathode on a substrate;
dividing the in-plane auxiliary cathode into a plurality of blocks;
and sequentially taking one of the blocks as a target block, respectively applying different voltages to the target block and other blocks except the target block in the blocks to burn through and conduct the target block, and electrically connecting the face cathode with the in-face auxiliary cathode after the burn-through and conduction of all the blocks are completed.
As shown in fig. 3, which is a schematic view of an embodiment of a method for manufacturing an OLED display panel according to an embodiment of the present invention, the method for manufacturing an OLED display panel includes:
s301, forming a surface cathode and an in-plane auxiliary cathode on the substrate.
Specifically, further, the forming of the planar cathode and the in-plane auxiliary cathode on the substrate may include: forming an in-plane auxiliary cathode in a display area on a substrate; forming an OLED vapor-deposited film layer on the substrate with the in-plane auxiliary cathode; and forming a surface cathode on the OLED vapor deposition film layer on the substrate on which the OLED vapor deposition film layer is formed.
S302, dividing the in-plane auxiliary cathode into a plurality of blocks.
As shown in fig. 4, the schematic diagram of the structure of the in-plane auxiliary cathode divided into a plurality of blocks according to the embodiment of the present invention is shown, where the in-plane auxiliary cathode is divided into a plurality of blocks, that is, when the in-plane auxiliary cathode is divided into a plurality of blocks, a corresponding voltage input terminal and a corresponding plane cathode input terminal are provided for each block. At this time, each of the plurality of blocks is provided with a corresponding voltage input terminal and a face cathode input terminal.
And S303, sequentially taking one of the blocks as a target block, and respectively applying different voltages to the target block and other blocks except the target block in the blocks to burn through and conduct the target block, wherein after all the blocks are burnt through and conducted, the face cathode is electrically connected with the in-face auxiliary cathode.
According to the preparation method of the OLED display panel, the surface cathode and the in-plane auxiliary cathode are formed on the substrate; dividing the in-plane auxiliary cathode into a plurality of blocks; and sequentially taking one of the blocks as a target block, and respectively applying different voltages to the target block and other blocks except the target block in the blocks to burn through and conduct the target block, wherein after all the blocks are burnt through and conducted, the face cathode is electrically connected with the in-face auxiliary cathode. In the embodiment of the invention, the mode of partitioning the Burn in by the opposite auxiliary cathode is utilized, so that the problem of poor effect of the Burn in of the middle contact hole of the panel can be effectively solved, the voltage drop condition of the OLED display panel is effectively improved, and the display performance of the OLED display panel is improved.
As shown in fig. 5, a schematic view is shown after the overlap joint and input mode between the in-plane cathode and the in-plane auxiliary cathode in the embodiment of the present invention, compared with the schematic view shown in fig. 2 in the prior art, the display is more uniform and the display effect is better.
In the embodiment of the present invention, sequentially taking one of the blocks as a target block, applying different voltages to the target block and other blocks except the target block in the blocks, so that the target block is burned through and conducted, and after all the blocks are burned through and conducted, the face cathode is electrically connected to the in-plane auxiliary cathode, which has a plurality of implementation manners, specifically as follows:
in an implementation manner of the present invention, the sequentially using one of the blocks as a target block, applying different voltages to the target block and other blocks except the target block in the plurality of blocks, respectively, so that the target block is burned through and conducted, and after the burn through and conduction of all the blocks are completed, electrically connecting the face cathode and the in-plane auxiliary cathode may include: applying a voltage of X volts to the face cathode; sequentially taking one of the blocks as a target block, applying a voltage of 0V to the auxiliary cathodes in the target block, and applying a voltage of X V to the in-plane auxiliary cathodes in the rest blocks except the target block in the blocks to burn through and conduct the target block, wherein the in-plane cathodes are electrically connected with the in-plane auxiliary cathodes after the burn through and conduction of all the blocks are completed; wherein X is a nonzero value, for example, 5V, preferably, X is less than 20V, and a value of X may be specifically set according to the in-plane auxiliary cathode.
In another implementation manner of the present invention, the sequentially taking one of the blocks as a target block, applying different voltages to the target block and other blocks except the target block in the blocks, respectively, so that the target block is electrically burned through, and after the burn-through conduction of all the blocks is completed, electrically connecting the face cathode to the in-plane auxiliary cathode includes: applying a voltage of Y volts to the face cathode; sequentially taking one of the blocks as a target block, applying a voltage of 0V to the auxiliary cathodes in the target block, and applying a floating voltage to the in-plane auxiliary cathodes in the rest blocks except the target block to burn through the target block, so that the target block is electrically connected with the in-plane auxiliary cathodes after the burn through conduction of all the blocks is completed; where Y is a non-zero value, e.g., 5V.
Similarly, the floating voltage is also a non-zero value, and the floating voltage value may be randomly floated, increased, decreased, or reversed according to different blocks, for example, 5V, 6V, -5V, or the like, or may be changed according to a preset floating condition, for example, the preset floating condition is that the floating voltage is cyclically sampled according to voltages of 5V, 8V, and 11V, specifically, when the target block is a first block of the plurality of blocks, the floating voltage is 5V, when the target block is a second block of the plurality of blocks, the floating voltage is 8V, and when the target block is a fourth block of the plurality of blocks, the floating voltage is 5V again, and so on.
In the embodiment of the present invention, after the application of the voltage to the in-plane auxiliary cathode is stopped for a certain period of time, the shape of the in-plane auxiliary cathode does not return to the shape before the voltage is not applied. That is, the shape of the in-plane auxiliary cathode is always maintained after the deformation, or even if the shrinkage occurs, the shape is deformed before the voltage is not applied. Here, the configuration of the in-plane auxiliary cathode is not limited, and it is sufficient if the in-plane auxiliary cathode is electrically connected to the in-plane auxiliary cathode after a voltage is applied to the in-plane auxiliary cathode, thereby forming a connection path.
In order to better implement the preparation method of the OLED display panel in the embodiment of the present invention, on the basis of the preparation method of the OLED display panel, the embodiment of the present invention further provides the OLED display panel, and the OLED display panel can be prepared by any one of the above preparation methods of the OLED display panel.
Specifically, as shown in fig. 6, which is a schematic view of a partial structure of an OLED display panel in an embodiment of the present invention, the OLED display panel includes:
a substrate;
the in-plane auxiliary cathode 601, the OLED vapor-deposited film layer 602 and the surface cathode 603 are sequentially arranged on the substrate and positioned in the display area;
the in-plane auxiliary cathode 601 is divided into a plurality of blocks, at least one connecting channel is arranged on the OLED vapor deposition film layer 602, and the in-plane cathode 603 is electrically connected with the in-plane auxiliary cathode 601 at the position of the connecting channel.
Further, each of the plurality of blocks is provided with a corresponding voltage input terminal and a face cathode input terminal.
It should be noted that, in the above embodiment of the OLED display panel, only the above structure is described, and it is understood that, in addition to the above structure, the OLED display panel according to the embodiment of the present invention may further include any other necessary structure as needed, which is not specifically described, for example, as shown in fig. 5, the OLED display panel may further include an anode 604, a pixel electrode 605, a Pixel Definition Layer (PDL) 606, and the like, which is not limited herein.
By adopting the OLED display panel as described in the above embodiments, the performance of a display device adopting the OLED display panel is improved.
An embodiment of the present invention further provides a display device, which includes the OLED display panel described in any of the above embodiments of the OLED display panel.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
In a specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as one or several entities, and the specific implementation of each unit or structure may refer to the foregoing method embodiment, which is not described herein again.
The method for manufacturing the OLED display panel, the OLED display panel and the display device provided in the embodiments of the present invention are described in detail above, and a specific example is applied in the present disclosure to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the method and the core concept of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (4)
1. The preparation method of the OLED display panel is characterized by comprising the following steps:
forming an in-plane auxiliary cathode in a display area on a substrate;
forming an OLED vapor-deposited film layer on the substrate with the in-plane auxiliary cathode;
forming a surface cathode on the OLED vapor deposition film layer on the substrate on which the OLED vapor deposition film layer is formed;
dividing the in-plane auxiliary cathode into a plurality of blocks, wherein each block is provided with a corresponding voltage input end and a corresponding plane cathode input end;
applying a voltage of X volts to the face cathode;
sequentially taking one of the blocks as a target block, applying a voltage of 0V to the auxiliary cathodes in the target block, and applying a voltage of X V to the in-plane auxiliary cathodes in the rest blocks except the target block in the blocks to burn through and conduct the target block, wherein the in-plane cathodes are electrically connected with the in-plane auxiliary cathodes after the burn through and conduction of all the blocks are completed;
wherein X is a non-zero value.
2. The method of claim 1, wherein the sequentially using one of the blocks as a target block, applying different voltages to the target block and other blocks except the target block to make the target block burn through and conduct, and electrically connecting the surface cathode with the in-plane auxiliary cathode after completing the burn through and conduct of all the blocks comprises:
applying a voltage of Y volts to the face cathode;
sequentially taking one of the blocks as a target block, applying a voltage of 0V to the auxiliary cathodes in the target block, and applying a floating voltage to the in-plane auxiliary cathodes in the rest blocks except the target block to burn through the target block, so that the target block is electrically connected with the in-plane auxiliary cathodes after the burn through conduction of all the blocks is completed;
wherein Y is a non-zero value and the floating voltage is a non-zero value.
3. The method of manufacturing an OLED display panel according to claim 1, wherein X is less than 20V.
4. An OLED display panel, wherein the OLED display panel is prepared by the OLED display panel preparation method of any one of claims 1 to 3.
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| CN107785381A (en) * | 2017-10-13 | 2018-03-09 | 深圳市华星光电半导体显示技术有限公司 | The preparation method and oled panel of oled panel |
| CN108598291A (en) * | 2018-04-24 | 2018-09-28 | 京东方科技集团股份有限公司 | Display panel and its manufacturing method, display device |
| CN109411505A (en) * | 2017-08-17 | 2019-03-01 | 京东方科技集团股份有限公司 | Display base plate and preparation method thereof, display device and its driving method |
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| CN109411505A (en) * | 2017-08-17 | 2019-03-01 | 京东方科技集团股份有限公司 | Display base plate and preparation method thereof, display device and its driving method |
| CN107785381A (en) * | 2017-10-13 | 2018-03-09 | 深圳市华星光电半导体显示技术有限公司 | The preparation method and oled panel of oled panel |
| CN108598291A (en) * | 2018-04-24 | 2018-09-28 | 京东方科技集团股份有限公司 | Display panel and its manufacturing method, display device |
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