CN113594213B - Display panel and display device - Google Patents
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- CN113594213B CN113594213B CN202110859789.6A CN202110859789A CN113594213B CN 113594213 B CN113594213 B CN 113594213B CN 202110859789 A CN202110859789 A CN 202110859789A CN 113594213 B CN113594213 B CN 113594213B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
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Abstract
本文公开一种显示面板，包括：基底、设置在所述基底上的像素驱动结构层和设置在所述像素驱动结构层上的子像素单元；所述像素驱动结构层中包括阴极走线；所述子像素单元包括依次叠置的阳极、有机功能层和阴极；所述子像素单元的阳极设置在所述像素驱动结构层上，所述子像素单元的阳极的一部分设置在像素开口区内，另一部分设置在像素非开口区内；所述子像素单元的有机功能层和阴极设置在所述子像素单元的像素开口区内以及像素非开口区内；在子像素单元的像素非开口区内设置平行于基底的导流单元，所述导流单元与所述子像素单元的有机功能层接触，并且连接所述阴极走线。本文提供的显示面板能够防止像素串扰。
The present invention discloses a display panel, comprising: a substrate, a pixel driving structure layer arranged on the substrate, and a sub-pixel unit arranged on the pixel driving structure layer; the pixel driving structure layer includes a cathode wiring; the sub-pixel unit includes an anode, an organic functional layer, and a cathode stacked in sequence; the anode of the sub-pixel unit is arranged on the pixel driving structure layer, a part of the anode of the sub-pixel unit is arranged in a pixel opening area, and the other part is arranged in a pixel non-opening area; the organic functional layer and the cathode of the sub-pixel unit are arranged in the pixel opening area and the pixel non-opening area of the sub-pixel unit; a flow guide unit parallel to the substrate is arranged in the pixel non-opening area of the sub-pixel unit, the flow guide unit is in contact with the organic functional layer of the sub-pixel unit, and is connected to the cathode wiring. The display panel provided herein can prevent pixel crosstalk.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
The OLED (Organic LIGHT EMITTING Diode) has the advantages of self-luminescence, wide viewing angle, high contrast, flexibility, low cost and the like. A Flexible Display device (Flexible Display) using an OLED as a light emitting device and a TFT (Thin Film Transistor ) for signal control has become a mainstream product in the current Display field.
With the rapid development of OLED technology in recent years, the requirements on the preparation process are higher and higher. The OLED panel is prepared with an organic functional layer by vapor deposition, and since current may be laterally transferred between the organic functional layers, crosstalk is generated between different pixels.
Disclosure of Invention
In a first aspect, the present disclosure provides a display panel, comprising: the pixel driving structure comprises a substrate, a pixel driving structure layer arranged on the substrate and a sub-pixel unit arranged on the pixel driving structure layer;
the pixel driving structure layer comprises a cathode wire;
The sub-pixel unit comprises an anode, an organic functional layer and a cathode which are sequentially stacked; the anodes of the sub-pixel units are arranged on the pixel driving structure layer, one part of the anodes of the sub-pixel units are arranged in the pixel opening area, and the other part of the anodes of the sub-pixel units are arranged in the pixel non-opening area; the organic functional layer and the cathode of the sub-pixel unit are arranged in the pixel opening area and the pixel non-opening area of the sub-pixel unit;
And a flow guiding unit parallel to the substrate is arranged in the pixel non-opening area of the sub-pixel unit, is contacted with the organic functional layer of the sub-pixel unit, and is connected with the cathode wiring.
In a second aspect, the present disclosure provides a display device including the above display panel.
The embodiment of the disclosure provides a display panel, by arranging a flow guiding unit parallel to a substrate in a pixel non-opening area of a sub-pixel unit, the flow guiding unit is in contact with an organic functional layer and is connected with a cathode wiring, and because the conductivity of the flow guiding unit is better than that of the organic functional layer, current transversely transmitted through the organic functional layer can be preferentially transmitted to the cathode wiring along the flow guiding unit and cannot transversely cross the flow guiding unit to enter light-emitting areas of other sub-pixel units, so that pixel crosstalk can be prevented.
Drawings
The accompanying drawings are included to provide an understanding of the technical aspects of the present disclosure, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present disclosure and together with the embodiments of the disclosure, not to limit the technical aspects of the present disclosure.
Fig. 1 is a schematic cross-sectional structure of a display panel according to an embodiment of the disclosure;
fig. 2 is a schematic cross-sectional structure of a display panel according to an embodiment of the disclosure;
fig. 3 is a schematic plan view of a conductive mesh according to an embodiment of the disclosure;
fig. 4 is a schematic diagram of a current guiding unit according to an embodiment of the disclosure;
fig. 5 is a schematic cross-sectional structure of an organic functional layer according to an embodiment of the disclosure;
fig. 6 is a schematic cross-sectional structure of another display panel according to an embodiment of the disclosure;
Fig. 7 is a schematic plan view of another conductive mesh according to an embodiment of the present disclosure.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail hereinafter with reference to the accompanying drawings. Note that embodiments may be implemented in a number of different forms. One of ordinary skill in the art can readily appreciate the fact that the manner and content may be varied into a wide variety of forms without departing from the spirit and scope of the present disclosure. Accordingly, the present disclosure should not be construed as being limited to the following description of the embodiments. Embodiments of the present disclosure and features of embodiments may be combined with each other arbitrarily without conflict.
In the drawings, the size of each constituent element, the thickness of a layer, or a region may be exaggerated for clarity. Accordingly, one aspect of the present disclosure is not necessarily limited to this dimension, and the shapes and sizes of the various components in the drawings do not reflect actual proportions. Further, the drawings schematically show ideal examples, and one mode of the present disclosure is not limited to the shapes or numerical values shown in the drawings, and the like.
The ordinal numbers of "first", "second", "third", etc. in the present specification are provided to avoid mixing of constituent elements, and are not intended to be limited in number.
In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly, unless explicitly stated or limited otherwise. For example, it may be a fixed connection, a removable connection, or an integral connection; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intermediate members, or may be in communication with the interior of two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art in the specific context.
In this specification, a transistor means an element including at least three terminals of a gate electrode, a drain electrode, and a source electrode. The transistor has a channel region between a drain electrode (a drain electrode terminal, a drain region, or a drain electrode) and a source electrode (a source electrode terminal, a source region, or a source electrode), and a current can flow through the drain electrode, the channel region, and the source electrode. Note that in this specification, a channel region refers to a region through which current mainly flows.
In this specification, the first electrode may be a drain electrode, the second electrode may be a source electrode, or the first electrode may be a source electrode and the second electrode may be a drain electrode. In the case of using a transistor having opposite polarity, or in the case of a change in the direction of current during circuit operation, the functions of the "source electrode" and the "drain electrode" may be interchanged. Therefore, in this specification, "source electrode" and "drain electrode" may be exchanged with each other.
In this specification, "electrically connected" includes a case where constituent elements are connected together by an element having some electric action. The "element having a certain electric action" is not particularly limited as long as it can transmit and receive an electric signal between the constituent elements connected. Examples of the "element having some electric action" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, other elements having various functions, and the like.
In this specification, "film" and "layer" may be exchanged with each other. For example, the "conductive layer" may be sometimes replaced with a "conductive film". In the same manner, the "insulating film" may be replaced with the "insulating layer" in some cases.
The term "about" in this disclosure refers to values that are not strictly limited to the limits, but are allowed to fall within the limits of the process and measurement errors.
The embodiment of the disclosure provides a display panel. As shown in fig. 1, a display panel provided in an embodiment of the present disclosure includes: a substrate 10, a pixel driving structure layer 20 disposed on the substrate, and a sub-pixel unit disposed on the pixel driving structure layer;
The pixel driving structure layer comprises a pixel driving circuit, and the pixel driving circuit comprises a cathode wiring;
The sub-pixel unit comprises an anode 301, an organic functional layer 303 and a cathode 305 which are sequentially stacked; the anodes of the sub-pixel units are arranged on the pixel driving structural layer, one part of the anodes of the sub-pixel units are arranged in the pixel opening area 401, and the other part of the anodes of the sub-pixel units are arranged in the pixel non-opening area 402; the organic functional layer and the cathode of the sub-pixel unit are arranged in the pixel opening area and the pixel non-opening area of the sub-pixel unit;
a flow guiding unit 50 parallel to the substrate is disposed in the pixel non-opening area of the sub-pixel unit, and the flow guiding unit is in contact with the organic functional layer of the sub-pixel unit and is connected with the cathode wiring.
According to the display panel provided by the embodiment, the flow guiding unit parallel to the substrate is arranged in the pixel non-opening area of the sub-pixel unit, the flow guiding unit is in contact with the organic functional layer and is connected with the cathode wiring, and because the conductivity of the flow guiding unit is better than that of the organic functional layer, current transversely transmitted through the organic functional layer can be preferentially transmitted to the cathode wiring along the flow guiding unit and cannot transversely cross the flow guiding unit to enter the light emitting area of other sub-pixel units, so that the generation of pixel crosstalk can be prevented.
The pixel opening area of the sub-pixel unit is used for limiting the light emitting area of the sub-pixel unit, and the pixel non-opening area of the sub-pixel unit is used for limiting the area outside the light emitting area of the sub-pixel unit.
In some exemplary embodiments, the deflector unit is a closed deflector ring. The closed guide ring can enable transverse current in any direction to be led into the cathode wiring through the lead, so that pixel crosstalk caused by the fact that the transverse current enters the light-emitting areas of other sub-pixel units is avoided.
In some exemplary embodiments, the opening shape of the flow guiding unit includes: a polygon; such as a quadrilateral or a hexagon. The opening shape of the flow guiding unit is set to be polygonal, so that the mask plate is convenient to manufacture, and the patterning difficulty is reduced.
In some exemplary embodiments, the orthographic projection of the deflector ring of the sub-pixel unit on the substrate is outside the orthographic projection of the anode of the sub-pixel unit on the substrate, and there is no overlapping area therebetween. The guide ring keeps a certain interval with the anode in the horizontal direction, and interlayer capacitance between the guide ring and the anode can be avoided.
In some exemplary embodiments, the flow directing units of the plurality of sub-pixel units are interconnected to form a conductive mesh that connects the cathode trace through leads and vias. The flow guiding units are mutually connected to form a grid shape, and the flow guiding units of other pixel units can be used as flow guiding paths, so that the number of flow guiding leads is reduced.
As shown in fig. 2, the display panel of the embodiment of the present disclosure further includes: a planarization layer 60 and a pixel defining layer 70;
the planarization layer is arranged on the pixel driving structure layer; the pixel defining layer is arranged on the planarization layer and the anode in the pixel non-opening area of the sub-pixel unit;
The flow guiding unit is arranged on the pixel defining layer in the pixel non-opening area of the sub-pixel unit and is contacted with the lower surface of the organic functional layer of the sub-pixel unit; the lower surface of the organic functional layer is the surface of the organic functional layer close to the substrate.
The sub-pixel unit includes: an organic light emitting diode OLED subpixel. In the fabrication of an OLED display panel, a pixel defining layer is generally prepared by coating an organic material on an anode, the pixel defining layer includes a pixel opening region and a Bank (barrier wall or spacer matrix) region, and the fabrication process generally includes the processes of coating, exposing, developing, curing, etc. the pixel defining layer material forms the pixel opening region in a region where the organic material is removed, and a Bank (barrier wall or spacer matrix) region is formed in a region where the organic material remains. The cathode wiring is a driving signal line, and is generally distributed at the peripheral edge of the display area, and is annularly distributed around the periphery of the display area.
In some exemplary embodiments, the deflector unit is a closed deflector ring; the guide ring surrounds the pixel opening area of the sub-pixel unit.
In some exemplary embodiments, the orthographic projection of the opening area of the flow guiding unit of the sub-pixel unit on the substrate covers the orthographic projection of the bottom surface area of the pixel opening area of the sub-pixel unit on the substrate.
In some exemplary embodiments, the opening shape of the flow guiding unit of the sub-pixel unit is the same as the bottom surface shape of the opening area of the sub-pixel unit.
In some exemplary embodiments, the material conductivity of the flow directing unit is greater than the material conductivity of the organic functional layer.
In some exemplary embodiments, the material of the flow directing unit includes: and (3) metal. In other embodiments, the material of the current guiding unit may be other conductive materials, so long as the conductivity of the current guiding unit is better than that of the organic functional layer, the current guiding unit can play a role in guiding current.
In some exemplary embodiments, as shown in fig. 3, the conductive mesh includes interconnected guide units, any one of the guide units is a closed guide ring, each guide ring surrounds a pixel opening area of one sub-pixel unit, and a peripheral guide ring of the conductive mesh is connected to the cathode trace through a lead and a via. The opening shape of the guide ring may be the same as the bottom shape of the pixel opening area of the sub-pixel unit surrounded by the guide ring. The orthographic projection of the opening area of the flow guiding unit of the sub-pixel unit on the substrate covers the orthographic projection of the bottom surface area of the pixel opening area of the sub-pixel unit on the substrate. The orthographic projection of the guide ring of the sub-pixel unit on the substrate is positioned outside the orthographic projection of the anode of the sub-pixel unit on the substrate. In other embodiments, the opening shape of the flow guiding unit may be different from the bottom shape of the pixel opening area of the sub-pixel unit.
In some exemplary embodiments, the organic functional layer includes: and a hole transport layer, an organic light emitting layer, and an electron transport layer which are stacked. In other embodiments, the organic functional layer may include: and a hole injection layer, a hole transport layer, an organic light emitting layer, and an electron transport layer which are stacked. In other embodiments, the organic functional layer may include: and a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, and an electron injection layer which are stacked.
In some exemplary embodiments, as shown in fig. 4, the current laterally transferred in the organic functional layer of the adjacent sub-pixel units is preferentially transferred to the cathode trace along the conductive line of the guide ring, and does not cross the conductive line of the guide ring laterally to enter the light emitting region of the other sub-pixel units, so that the generation of pixel crosstalk can be prevented.
In some exemplary embodiments, as shown in fig. 5, the organic functional layer 303 includes: a hole transport layer 3031, an organic light emitting layer 3032, and an electron transport layer 3033 are stacked. The hole transport layer and/or the electron transport layer of adjacent sub-pixel units are integrally arranged. The organic light emitting layers of adjacent sub-pixel units may overlap during the fabrication process. That is, the organic light emitting layer of the R color sub-pixel unit may overlap with the organic light emitting layer of the adjacent G color sub-pixel unit at the edge, or the organic light emitting layer of the G color sub-pixel unit may overlap with the organic light emitting layer of the adjacent B color sub-pixel unit at the edge, or the organic light emitting layer of the B color sub-pixel unit may overlap with the organic light emitting layer of the adjacent R color sub-pixel unit at the edge. Lateral current may occur in the hole transport layer, and if the organic light emitting layers of adjacent sub-pixel units overlap, lateral current may also occur in the organic light emitting layers. By arranging the conductive grids below the organic functional layer, current transversely transmitted in the organic light-emitting layer can be preferentially transmitted to the cathode wiring along the wires of the conductive grids, and cannot transversely cross the wires of the conductive grids to enter the light-emitting areas of other sub-pixel units, so that crosstalk can be prevented.
In some exemplary embodiments, the conductivity of the material of the flow directing unit is greater than the conductivity of the material of the hole transport layer. In some exemplary embodiments, the material conductivity of the flow guiding unit is greater than the material conductivity of the organic light emitting layer.
As shown in fig. 6, the display panel of the embodiment of the present disclosure further includes: a planarization layer 60 and a pixel defining layer 70;
The planarization layer is arranged on the pixel driving structure layer; the pixel defining layer is disposed on the planarization layer and the anode in the pixel non-opening area of the sub-pixel unit, and the pixel defining layer is provided with a groove 701; an organic functional layer and a cathode of the sub-pixel unit cover the pixel defining layer and the groove;
The flow guiding unit of the sub-pixel unit is arranged below the groove in the pixel non-opening area of the sub-pixel unit and is in contact with the lower surface of the organic functional layer of the sub-pixel unit; the lower surface of the organic functional layer is the surface of the organic functional layer close to the substrate.
In some exemplary embodiments, the flow guiding unit of the sub-pixel unit is disposed in the same layer as the anode of the sub-pixel unit.
In some exemplary embodiments, the deflector unit is a closed deflector ring; the guide ring surrounds the anode of the sub-pixel unit.
In some exemplary embodiments, the opening shape of the flow guiding unit of the sub-pixel unit is the same as the bottom surface shape of the anode of the sub-pixel unit.
In some exemplary embodiments, as shown in fig. 7, the conductive mesh includes interconnected flow guiding units, any one of the flow guiding units is a closed flow guiding ring, each flow guiding ring surrounds the anode of one sub-pixel unit, and the peripheral flow guiding ring of the conductive mesh is connected to the cathode trace through a lead and a via. The opening shape of the guide ring may be the same as the anode shape of the sub-pixel unit surrounded by the guide ring. The orthographic projection of the opening area of the guide ring on the substrate covers the orthographic projection of the anode of the sub-pixel unit on the substrate. In other embodiments, the shape of the opening of the guide ring may be different from the shape of the anode of the sub-pixel unit.
An exemplary description is made below by the manufacturing process of the display panel. The "patterning process" referred to in this disclosure includes, for metallic materials, inorganic materials, or transparent conductive materials, processes such as photoresist coating, mask exposure, development, etching, photoresist stripping, and the like, and for organic materials, processes such as organic material coating, mask exposure, and development, and the like. The deposition may be any one or more of sputtering, evaporation, chemical vapor deposition, coating may be any one or more of spraying, spin coating, and ink jet printing, and etching may be any one or more of dry etching and wet etching, without limitation of the disclosure. "film" refers to a layer of film formed by depositing, coating, or other process a material on a substrate. The "film" may also be referred to as a "layer" if the "film" does not require a patterning process throughout the fabrication process. If the "thin film" requires a patterning process throughout the fabrication process, it is referred to as a "thin film" prior to the patterning process, and as a "layer" after the patterning process. The "layer" after the patterning process includes at least one "pattern". The term "a and B are arranged in the same layer" in the present disclosure means that a and B are formed simultaneously by the same patterning process, and the "thickness" of the film layer is the dimension of the film layer in the direction perpendicular to the display substrate. In the exemplary embodiments of the present disclosure, "the orthographic projection of a includes the orthographic projection of B" or "the orthographic projection of B is within the range of the orthographic projection of a" means that the boundary of the orthographic projection of B falls within the boundary range of the orthographic projection of a or the boundary of the orthographic projection of a overlaps with the boundary of the orthographic projection of B.
The present disclosure also provides a method of manufacturing a display panel, which may include, in an exemplary embodiment:
s1, forming a pixel driving structure layer on a substrate, wherein the pixel driving structure layer comprises a cathode wire;
S2, forming a planarization layer on the pixel driving structure layer;
s3, forming a first electrode layer on the planarization layer, and patterning the first electrode layer to generate an anode of the sub-pixel unit;
s4, forming a pixel defining layer on the first electrode layer and the planarization layer, and patterning the pixel defining layer to generate a pixel opening area and a pixel non-opening area of the sub-pixel unit; the pixel opening area of the sub-pixel unit exposes part of the anode;
S5, forming a first conductor material layer on the pixel defining layer, and patterning the first conductor material layer to generate a flow guiding unit and a lead; forming a via hole in the pixel defining layer, the planarization layer and the pixel driving structure layer, wherein the via hole is used for exposing a cathode wire in the pixel driving structure layer; the flow guiding unit is connected with the cathode wiring through a lead and a via hole;
s6, forming an organic functional layer of the sub-pixel unit on the anode, the pixel defining layer and the flow guiding unit in the pixel opening area of the sub-pixel unit; the flow guiding unit is contacted with the organic functional layer;
and S7, forming a second electrode layer on the organic functional layer, and patterning the second electrode layer to generate a cathode of the sub-pixel unit.
The present disclosure also provides a method of manufacturing a display panel, which may include, in an exemplary embodiment:
s1, forming a pixel driving structure layer on a substrate, wherein the pixel driving structure layer comprises a cathode wire;
S2, forming a planarization layer on the pixel driving structure layer;
s3, forming a first electrode layer and a first conductor material layer on the planarization layer, patterning the first electrode layer to generate an anode of a sub-pixel unit, and patterning the first conductor material layer to generate a flow guiding unit and a lead; forming a via hole in the planarization layer and the pixel driving structure layer, wherein the via hole is used for exposing a cathode wiring in the pixel driving structure layer; the flow guiding unit is connected with the cathode wiring through a lead and a via hole;
s4, forming a pixel defining layer on the first electrode layer, the first conductor material layer and the planarization layer, and patterning the pixel defining layer to generate a pixel opening area and a pixel non-opening area of the sub-pixel unit; the pixel opening area of the sub-pixel unit exposes part of the anode; a groove is formed in the pixel defining layer, and a part of the flow guiding unit is exposed out of the groove;
S5, forming an organic functional layer of the sub-pixel unit in the anode, the groove and the pixel defining layer in the pixel opening area of the sub-pixel unit;
And S6, forming a second electrode layer on the organic functional layer, and patterning the second electrode layer to generate a cathode of the sub-pixel unit.
The embodiment of the disclosure also provides a display device comprising the display panel.
The display device may be an organic light emitting display device. The display device may be: any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator product and the like. Other essential components of the display device are those of ordinary skill in the art and will not be described in detail herein, nor should they be considered as limiting the present disclosure.
While the embodiments disclosed in the present disclosure are described above, the embodiments are only employed for facilitating understanding of the present disclosure, and are not intended to limit the present disclosure. Any person skilled in the art to which this disclosure pertains will appreciate that numerous modifications and changes in form and details can be made without departing from the spirit and scope of the disclosure, but the scope of the disclosure is to be determined by the appended claims.
Claims (13)
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| CN114023910A (en) * | 2021-11-05 | 2022-02-08 | 武汉天马微电子有限公司 | A display panel and display device |
| CN114188495B (en) * | 2021-12-10 | 2024-08-20 | 惠州华星光电显示有限公司 | Display panel and preparation method thereof |
| CN115020615B (en) * | 2022-06-16 | 2023-10-31 | 武汉华星光电半导体显示技术有限公司 | Display device and display terminal |
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