CN113594213A - Display panel and display device - Google Patents
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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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。
Disclosed herein is a display panel, comprising: a substrate, a pixel driving structure layer disposed on the substrate, and a sub-pixel unit disposed on the pixel driving structure layer; the pixel driving structure layer includes cathode wirings; The sub-pixel unit includes an anode, an organic functional layer and a cathode that are stacked in sequence; the anode of the sub-pixel unit is arranged on the pixel driving structure layer, and a part of the anode of the sub-pixel unit is arranged in the pixel opening area, The other part is 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; in the pixel non-opening area of the sub-pixel unit A current guide unit is arranged parallel to the substrate, the current guide unit is in contact with the organic functional layer of the sub-pixel unit, and is connected to the cathode wiring. The display panels provided herein are capable of preventing pixel crosstalk.
Description
Technical Field
The present disclosure relates to but not limited to the field of display technologies, and in particular, to a display panel and a display device.
Background
An OLED (Organic Light Emitting Diode) has advantages of self-luminescence, wide viewing angle, high contrast, flexibility, and low cost. A Flexible Display device (Flexible Display) using an OLED as a light emitting device and using a TFT (Thin Film Transistor) for signal control has become a mainstream product in the Display field at present.
In recent years, with the rapid development of OLED technology, the requirement for the preparation process is higher and higher. The OLED panel adopts an evaporation method to prepare an organic functional layer, and crosstalk is generated among different pixels because current can be transversely transmitted among the organic functional layers.
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 wiring;
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 arranging a flow guide unit parallel to the substrate in a pixel non-opening area of the sub-pixel unit, wherein the flow guide unit is in contact 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, through set up the water conservancy diversion unit that is on a parallel with the basement in the pixel non-opening area of subpixel unit, the water conservancy diversion unit contacts with organic functional layer and connects the negative pole and walks the line, because the electric conductivity of water conservancy diversion unit is better than organic functional layer, the electric current of horizontal transmission through organic functional layer can be preferentially transmitted to the negative pole along the water conservancy diversion unit and walks the line, can not transversely cross the light emitting area that the water conservancy diversion unit got into other subpixel units, consequently can prevent pixel crosstalk.
Drawings
The accompanying drawings are included to provide an understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the disclosure;
fig. 2 is a schematic cross-sectional structure diagram 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 present 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 diagram of an organic functional layer according to an embodiment of the present disclosure;
fig. 6 is a schematic cross-sectional structure diagram of another display panel provided in the embodiment of the present disclosure;
fig. 7 is a schematic plan view of another conductive grid according to the embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the embodiments may be implemented in a plurality of different forms. Those skilled in the art can readily appreciate the fact that the forms and details may be varied into a variety of forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the contents described in the following embodiments. The embodiments and features of the embodiments in the present disclosure may be arbitrarily combined with each other without conflict.
In the drawings, the size of each component, the thickness of layers, or regions may be exaggerated for clarity. Therefore, one aspect of the present disclosure is not necessarily limited to the dimensions, and the shapes and sizes of the respective components in the drawings do not reflect a true scale. Further, the drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes, numerical values, and the like shown in the drawings.
The ordinal numbers such as "first", "second", "third", and the like in the present specification are provided for avoiding confusion among the constituent elements, and are not limited in number.
In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited. For example, it may be a fixed connection, or a removable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.
In this specification, a transistor refers to an element including at least three terminals, i.e., a gate electrode, a drain electrode, and a source electrode. The transistor has a channel region between a drain electrode (drain electrode terminal, drain region, or drain electrode) and a source electrode (source electrode terminal, source region, or source electrode), and 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 where current mainly flows.
In this specification, the first electrode may be a drain electrode and 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 transistors of opposite polarities, or in the case of changing the direction of current flow 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 kind of electrical action. The "element having a certain electric function" is not particularly limited as long as it can transmit and receive an electric signal between connected components. Examples of the "element having some kind of electric function" 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 the present specification, "film" and "layer" may be interchanged with each other. For example, the "conductive layer" may be sometimes replaced with a "conductive film". Similarly, the "insulating film" may be replaced with an "insulating layer".
"about" in this disclosure means that the limits are not strictly defined, and that the numerical values are within the tolerances allowed for the process and measurement.
The disclosed embodiments provide a display panel. As shown in fig. 1, a display panel provided in an embodiment of the present disclosure includes: the display panel comprises a substrate 10, a pixel driving structure layer 20 arranged on the substrate and a sub-pixel unit arranged 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 structure 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;
and arranging a flow guide unit 50 parallel to the substrate in a pixel non-opening area of the sub-pixel unit, wherein the flow guide 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 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 and is connected with the cathode wiring, and as the conductivity of the flow guide unit is better than that of the organic functional layer, the current transversely transmitted through the organic functional layer can be preferentially transmitted to the cathode wiring along the flow guide unit and cannot transversely cross the flow guide unit to enter the light emitting areas 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 flow guide unit is a closed flow guide ring. The closed flow guide ring can lead transverse current in any direction to the cathode wiring through the conducting wire, so that the transverse current is prevented from entering the light emitting areas of other sub-pixel units to cause pixel crosstalk.
In some exemplary embodiments, the opening shape of the flow guide unit includes: a polygon; such as a quadrilateral or a hexagon. The opening shape of the flow guide unit is set to be polygonal, so that the mask is convenient to manufacture, and the patterning difficulty is reduced.
In some exemplary embodiments, an orthogonal projection of the guide ring of the sub-pixel unit on the substrate is outside an orthogonal projection of the anode of the sub-pixel unit on the substrate, and there is no overlapping region between the two. The diversion ring keeps a certain interval with the anode in the horizontal direction, and interlayer capacitance between the diversion ring and the anode can be avoided.
In some exemplary embodiments, the current guiding cells of the plurality of sub-pixel cells are connected to each other to form a conductive grid, and the conductive grid is connected to the cathode trace through a lead and a via. The grid-shaped guide units are connected with each other to form a guide path by the guide units of other pixel units, so that the number of guide 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 flattening layer and the anode in the pixel non-opening area of the sub-pixel unit;
the flow guide unit is arranged on the pixel defining layer 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; wherein, 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 (Bank or spacer) region, and the fabrication process generally includes coating, exposing, developing, and curing the pixel defining layer material, the pixel opening region is formed in the region where the organic material is removed, and the Bank (Bank or spacer) region is formed in the region where the organic material is remained. The cathode trace is a driving signal line, generally distributed at the peripheral edge of the display area, and annularly distributed around the periphery of the display area.
In some exemplary embodiments, the flow guide unit is a closed flow guide ring; the diversion ring surrounds the pixel opening area of the sub-pixel unit.
In some exemplary embodiments, an orthographic projection of an opening area of the flow guide unit of the sub-pixel unit on the substrate covers an orthographic projection of a 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 guide unit of the sub-pixel unit is the same as the bottom shape of the opening area of the sub-pixel unit.
In some exemplary embodiments, the material conductivity of the flow guide unit is greater than the material conductivity of the organic functional layer.
In some exemplary embodiments, the material of the flow guide unit includes: a metal. In other embodiments, the material of the current guiding element may also be other conductor materials, and as long as the conductive performance of the current guiding element is better than that of the organic functional layer, the current guiding element can play a role in guiding current.
In some exemplary embodiments, as shown in fig. 3, the conductive mesh includes interconnected flow guiding cells, any one of the flow guiding cells is a closed flow guiding ring, each flow guiding ring surrounds a pixel opening region of one sub-pixel cell, and a 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 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 guide 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 diversion 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 guide unit may be different from the bottom shape of the pixel opening region of the sub-pixel unit.
In some exemplary embodiments, the organic functional layer includes: 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: the organic light emitting device comprises a hole injection layer, a hole transport layer, an organic light emitting layer and an electron transport layer which are arranged in a stacked mode. In other embodiments, the organic functional layer may include: the organic light emitting device comprises a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer and an electron injection layer which are arranged in a stacked mode.
In some exemplary embodiments, as shown in fig. 4, the current laterally transmitted in the organic functional layer of the adjacent sub-pixel unit is preferentially transmitted to the cathode trace along the conductive line of the current guiding ring, and does not laterally cross the conductive line of the current guiding ring to enter the light emitting area of the other sub-pixel unit, 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, which 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 be overlapped during the manufacturing process. That is, the organic light emitting layer of the sub-pixel unit of the R color may overlap the organic light emitting layer of the adjacent sub-pixel unit of the G color at the edge, or the organic light emitting layer of the sub-pixel unit of the G color may overlap the organic light emitting layer of the adjacent sub-pixel unit of the B color at the edge, or the organic light emitting layer of the sub-pixel unit of the B color may overlap the organic light emitting layer of the adjacent sub-pixel unit of the R color at the edge. Lateral current may occur in the hole transport layer and also in the organic light emitting layer if the organic light emitting layers of adjacent sub-pixel units overlap. Through set up the electrically conductive net in organic functional layer below, the electric current of horizontal transmission can be transmitted to the cathode wire along the wire of electrically conductive net to the priority in the organic luminescent layer, can not transversely cross the wire of electrically conductive net and get into the luminous region of other sub-pixel units, consequently can prevent the production of crosstalking.
In some exemplary embodiments, the material conductivity of the flow guide unit is greater than the material conductivity of the hole transport layer. In some exemplary embodiments, the material conductivity of the flow guide 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 arranged on the flattening 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; the organic functional layer and the cathode of the sub-pixel unit cover the pixel defining layer and the groove;
the flow guide 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; wherein, 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 current guiding unit of the sub-pixel unit is disposed at the same layer as the anode of the sub-pixel unit.
In some exemplary embodiments, the flow guide unit is a closed flow guide ring; the guide ring surrounds the anode of the sub-pixel unit.
In some exemplary embodiments, the opening shape of the flow guide 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 cells, any one of the flow guiding cells is a closed flow guiding ring, each flow guiding ring surrounds an anode of one sub-pixel unit, and a 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 flow guide ring on the substrate covers the orthographic projection of the anode of the sub-pixel unit on the substrate. In other embodiments, the opening shape of the guide ring may be different from the shape of the anode of the sub-pixel unit.
The following is an exemplary description through a manufacturing process of the display panel. The "patterning process" referred to in the present disclosure includes processes of coating a photoresist, mask exposure, development, etching, stripping a photoresist, and the like, for a metal material, an inorganic material, or a transparent conductive material, and processes of coating an organic material, mask exposure, development, and the like, for an organic material. The deposition can be any one or more of sputtering, evaporation and chemical vapor deposition, the coating can be any one or more of spraying, spin coating and ink-jet printing, and the etching can be any one or more of dry etching and wet etching, and the disclosure is not limited. "thin film" refers to a layer of a material deposited, coated, or otherwise formed on a substrate. The "thin film" may also be referred to as a "layer" if it does not require a patterning process throughout the fabrication process. If the "thin film" requires a patterning process during the entire fabrication process, it is referred to as "thin film" before the patterning process and "layer" after the patterning process. The "layer" after the patterning process includes at least one "pattern". In the present disclosure, the term "a and B are disposed in the same layer" 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 embodiment of the present disclosure, "the forward projection of a includes the forward projection of B" or "the forward projection of B is located within the range of the forward projection of a", means that the boundary of the forward projection of B falls within the range of the boundary of the forward projection of a, or the boundary of the forward projection of a overlaps with the boundary of the forward 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 the substrate, wherein the pixel driving structure layer comprises a cathode wiring;
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 guide unit and a lead wire; forming via holes in the pixel defining layer, the planarization layer and the pixel driving structure layer, wherein the via holes are used for exposing cathode wiring in the pixel driving structure layer; the flow guide unit is connected with the cathode wire 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 guide unit in the pixel opening area of the sub-pixel unit; the flow guide unit is in contact 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 the 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 the substrate, wherein the pixel driving structure layer comprises a cathode wiring;
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 the sub-pixel unit, and patterning the first conductor material layer to generate a flow guide unit and a lead; forming via holes in the planarization layer and the pixel driving structure layer, wherein the via holes are used for exposing cathode wiring in the pixel driving structure layer; the flow guide unit is connected with the cathode wire 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 guide unit is exposed out of the groove;
s5, forming an organic functional layer of the sub-pixel unit in the anode in the pixel opening area of the sub-pixel unit, the groove and the pixel defining layer;
and S6, forming a second electrode layer on the organic functional layer, and patterning the second electrode layer to generate the cathode of the sub-pixel unit.
The embodiment of the disclosure also provides a display device, which comprises the display panel.
The display device may be an organic light emitting display device. The display device may be: any product or component with a 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 understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present disclosure.
Although the embodiments disclosed in the present disclosure are described above, the descriptions are only for the convenience of understanding the present disclosure, and are not intended to limit the present disclosure. It will be understood by those skilled in the art of the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure, and that the scope of the disclosure is to be limited only by the terms of the appended claims.
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| US12336390B2 (en) | 2021-12-10 | 2025-06-17 | Huizhou China Star Optoelectronics Display Co., Ltd. | Display panel, manufacturing method thereof, and display terminal |
| CN115020615A (en) * | 2022-06-16 | 2022-09-06 | 武汉华星光电半导体显示技术有限公司 | Display device and display terminal |
| 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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