CN114613918B - Display panel and display device - Google Patents
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- CN114613918B CN114613918B CN202210177217.4A CN202210177217A CN114613918B CN 114613918 B CN114613918 B CN 114613918B CN 202210177217 A CN202210177217 A CN 202210177217A CN 114613918 B CN114613918 B CN 114613918B
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- 239000010410 layer Substances 0.000 claims abstract description 280
- 239000012044 organic layer Substances 0.000 claims abstract description 59
- 239000000758 substrate Substances 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 description 24
- 239000010408 film Substances 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000005530 etching Methods 0.000 description 10
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000005525 hole transport Effects 0.000 description 3
- 238000001755 magnetron sputter deposition Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 3
- 229910001316 Ag alloy Inorganic materials 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
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- 238000007641 inkjet printing Methods 0.000 description 1
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- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- TUNODRIFNXIVIK-UHFFFAOYSA-N silver ytterbium Chemical compound [Ag].[Yb] TUNODRIFNXIVIK-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/824—Cathodes combined with auxiliary electrodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
-
- 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
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The application discloses a display panel and a display device, wherein the display panel comprises a sub-pixel area and an auxiliary cathode area which is arranged at intervals with the sub-pixel area, and the display panel comprises: a substrate; an electrode layer disposed on the substrate, including an auxiliary cathode layer located within the auxiliary cathode region; a first organic layer disposed on the substrate and the electrode layer; a cathode layer disposed on the first organic layer; the thickness of the first organic layer is smaller than that of the auxiliary cathode layer, the first organic layer comprises a first organic sub-portion arranged on the auxiliary cathode layer and a second organic sub-portion arranged at intervals with the first organic sub-portion and adjacent to the side face of the auxiliary cathode layer, and the cathode layer is arranged on the first organic sub-portion and the second organic sub-portion and electrically connected with the side face of the auxiliary cathode layer, so that the phenomenon of uneven display of the display panel is effectively improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel and a display device.
Background
An Organic Light-emitting Diode (OLED) display panel is called a third generation display technology because it has advantages of active Light emission, good temperature characteristics, low power consumption, fast response, flexibility, ultra-thin and low cost, etc. Currently, OLED panel display technology is tending to be an increasingly mature mass production technology and a rapidly growing market demand stage under the push of continuous capital investment and technology development of global manufacturers.
The existing light emitting modes of the OLED can be divided into three modes, namely top emission, bottom emission and double-sided emission, wherein the top emission OLED display panel is not influenced by whether a substrate transmits light or not, so that the aperture ratio of the display panel can be effectively improved, the design of a thin film transistor circuit on the substrate is expanded, the selection of electrode materials is enriched, the integration of a device and a TFT circuit is facilitated, and the OLED display panel with the most wide application at present is formed, but the OLED display panel of the type requires a certain high transparency of a top electrode. When a metal is used as the top electrode, the thickness thereof must be controlled to be less than 20 nm, and in the case of such a thin metal, the cross-sectional current is greatly limited, which shows poor conductivity, and when such a thin cathode is applied to a large-sized display panel, the voltage Drop (IR-Drop) level is different in different regions of the panel due to the difference in the distance of the supply circuit, and eventually display brightness is not uniform in different regions.
In order to solve the problem, the prior method is to additionally increase an auxiliary electrode area in the panel area except for the display luminous pixel area, and when the OLED is prepared, the thin-layer transparent top electrode is conducted with the auxiliary electrode, so that the potentials of the thin-layer top electrodes in different areas are kept consistent, however, the realization difficulty of the technology is that the auxiliary electrode is often covered in the process of evaporating organic materials as the bottom electrode of the pixel area, and finally the evaporated top electrode is difficult to form effective contact with the auxiliary electrode.
Disclosure of Invention
The application provides a display panel, which can effectively solve the problem that the display of the display panel is uneven due to the fact that a cathode layer and an auxiliary cathode layer are difficult to form effective electric connection.
In order to solve the above problems, in a first aspect, the present application provides a display panel including a sub-pixel region and an auxiliary cathode region disposed at a distance from the sub-pixel region, the display panel comprising:
a substrate;
an electrode layer disposed on the substrate, including an auxiliary cathode layer located within the auxiliary cathode region;
a first organic layer disposed on the substrate and the electrode layer;
a cathode layer disposed on the first organic layer;
the thickness of the first organic layer is smaller than that of the auxiliary cathode layer, the first organic layer comprises a first organic sub-portion arranged on the auxiliary cathode layer and a second organic sub-portion which is arranged at intervals with the first organic sub-portion and is adjacent to the side face of the auxiliary cathode layer, and the cathode layer is arranged on the first organic sub-portion and the second organic sub-portion and is electrically connected with the side face of the auxiliary cathode layer.
In an embodiment of the present application, the electrode layer further includes an anode layer disposed in the sub-pixel region, and materials of the anode layer and the auxiliary cathode layer are the same.
In an embodiment of the application, the display panel includes a pixel defining layer disposed on the substrate, the pixel defining layer includes a first opening in the auxiliary cathode region and a second opening in the sub-pixel region, the auxiliary cathode layer is disposed in the first opening and partially covers a bottom of the first opening, and the anode layer is disposed in the second opening.
In an embodiment of the present application, the electrode layer further includes an auxiliary cathode base layer disposed on a side of the auxiliary cathode layer, which is close to the substrate, and the auxiliary cathode base layer completely covers the bottom of the first opening.
In the display panel provided by the embodiment of the application, the electrode layer comprises a first electrode sub-layer, a second electrode sub-layer arranged on the first electrode sub-layer and a third electrode sub-layer arranged on the second electrode sub-layer;
the auxiliary cathode layer comprises a first auxiliary cathode sub-layer arranged on the auxiliary cathode basal layer and a second auxiliary cathode sub-layer arranged on the first auxiliary cathode sub-layer;
the first electrode sub-layer includes the auxiliary cathode base layer, the second electrode sub-layer includes the first auxiliary cathode sub-layer, and the third electrode sub-layer includes the second auxiliary cathode sub-layer.
In an embodiment of the present application, the display panel further includes a second organic layer disposed in the sub-pixel region, where the second organic layer is disposed between the anode layer and the second organic sub-portion.
In an embodiment of the present application, in the display panel, a region of the substrate not covered by the auxiliary cathode layer is annular in the first opening.
In an embodiment of the present application, a distance between an edge of the auxiliary cathode layer and the pixel defining layer is greater than 1um.
In the display panel provided by the embodiment of the application, an included angle formed by the side surface of the auxiliary cathode layer and the bottom surface of the auxiliary cathode layer is larger than 60 degrees.
In a second aspect, the present application further provides a display device, where the display device includes the aforementioned display panel.
The beneficial effects are that: the application provides a display panel and a display device, wherein an auxiliary cathode region is arranged in the display panel, an auxiliary cathode layer is arranged on a substrate in the auxiliary cathode region, a first organic layer is arranged on the auxiliary cathode layer and the substrate, and the thickness of the first organic layer is further smaller than that of the auxiliary cathode layer, so that the first organic layer cannot completely cover the side face of the auxiliary cathode layer to generate faults, namely the first organic layer comprises a first organic sub-part arranged on the auxiliary cathode layer and a second organic sub-part which is arranged at intervals with the first organic sub-part and is adjacent to the side face of the auxiliary cathode layer, and the cathode layer can be electrically connected with the side face of the auxiliary cathode layer through a spacing area between the first organic sub-part and the second organic sub-part, thereby effectively improving the phenomenon of uneven display caused by-Drop of the display panel.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional structure of a display panel according to an embodiment of the present application;
fig. 2 is a schematic cross-sectional structure of another display panel according to an embodiment of the present application;
fig. 3a to 3d are schematic structural flow diagrams of a method for manufacturing a display panel according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should 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 the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus 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 present application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "exemplary" in this disclosure 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 application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the application with unnecessary detail. Thus, the present application 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.
The embodiment of the application provides a display panel, and the following is a detailed description of a cross-sectional structure of the display panel shown in fig. 1.
The display panel includes a display area including a sub-pixel area A2 and an auxiliary cathode area A1 disposed at an interval from the sub-pixel area A2, and specifically, in the display panel, a plurality of sub-pixel areas A2 (one is exemplarily shown in the drawings) disposed at intervals are disposed, and the auxiliary cathode area A1 is disposed between adjacent sub-pixel areas A2, for providing an auxiliary cathode layer for improving display quality, as described in detail later.
Further, the display panel includes a substrate 110, an electrode layer 130, a first organic layer 150, and a cathode layer 160;
the substrate 110 includes a plurality of thin film transistors for driving a display; the electrode layer 130 is disposed on the substrate 110 and includes an auxiliary cathode layer 132 located in the auxiliary cathode region A1; the first organic layer 150 is disposed on the substrate 110 and the electrode layer 130, and the entire surface of the first organic layer 150 covers the display area of the display panel; the cathode layer 160 is disposed on the first organic layer 150 and covers the first organic layer 150 entirely;
the auxiliary cathode layer 132 forms a step with the substrate, and the thickness of the first organic layer 150 is smaller than the thickness of the auxiliary cathode layer 132, that is, the thickness of the first organic layer 150 is smaller than the step height formed by the auxiliary cathode layer 132 and the substrate, so that the first organic layer 150 cannot completely cover the side surface of the auxiliary cathode layer 132 at the step position to generate a fault, that is, the first organic layer 150 includes a first organic sub-portion 151 disposed on the auxiliary cathode layer 132 and a second organic sub-portion 152 disposed at a distance from the first organic sub-portion 151 and adjacent to the side surface of the auxiliary cathode layer 132, and the cathode layer 160 is disposed on the first organic sub-portion 151 and the second organic sub-portion 152 and is electrically connected to the side surface of the auxiliary cathode layer 132 through a spacing region between the first organic sub-portion 151 and the second organic sub-portion 152.
In the display panel provided in this embodiment, an auxiliary cathode region is provided, an auxiliary cathode layer is provided on a substrate in the auxiliary cathode region, the auxiliary cathode layer is only provided in a partial region of the auxiliary cathode region, so that a first organic layer on an upper layer is provided on the auxiliary cathode layer and the substrate, and further, the thickness of the first organic layer is smaller than that of the auxiliary cathode layer, so that the first organic layer cannot completely cover a side surface of the auxiliary cathode layer to generate faults, that is, the first organic layer includes a first organic sub-portion provided on the auxiliary cathode layer, and a second organic sub-portion provided at an interval with the first organic sub-portion and adjacent to a side surface of the auxiliary cathode layer, and the cathode layer can be electrically connected with the side surface of the auxiliary cathode layer through a spacing region between the first organic sub-portion and the second organic sub-portion, thereby effectively improving uneven display caused by IR-Drop of the display panel.
In some embodiments, the electrode layer 130 further includes an anode layer 131 disposed in the sub-pixel area A2, where materials of the anode layer 131 and the auxiliary cathode layer 132 are the same, that is, the anode layer 131 and the auxiliary cathode layer 132 are formed by the same manufacturing process in the manufacturing of the display panel, so that the manufacturing efficiency of the display panel is effectively improved, and the manufacturing cost of the display panel is reduced.
In some embodiments, with continued reference to fig. 1, the display panel includes a pixel defining layer 120 disposed on the substrate 110, the pixel defining layer 120 including a first opening G1 located within the auxiliary cathode region A1 and a second opening G2 located within the sub-pixel region A2, the auxiliary cathode layer 132 being disposed within the first opening G1 and partially covering a bottom of the first opening G1, i.e., such that the auxiliary cathode layer 132 forms a step with the substrate 110 for tomographic the first organic layer; the anode layer 131 is disposed in the second opening G2, and generally completely covers the bottom of the second opening G2;
it should be noted that, in the conventional manufacturing process of the conventional display panel, the anode layer 131 is usually formed first, that is, the auxiliary cathode layer 132 is also formed simultaneously, and then the pixel defining layer 120 needs to form the first opening G1 and the second opening G2 at the positions corresponding to the pixel defining layer 120, so that the auxiliary cathode layer 132 and the cathode layer 160 are electrically connected through the first opening G1, and the anode layer 131 and the first organic layer 150 are electrically connected through the second opening G2.
In some embodiments, in the first opening G1, the area of the substrate 110 not covered by the auxiliary cathode layer 132 is annular, that is, any position of the edge of the outer side surface of the auxiliary cathode layer 132 is spaced from the pixel defining layer 120, so that the auxiliary cathode layer 132 forms an annular step with the substrate, so as to increase the overlapping area of the cathode layer 160 and the auxiliary cathode layer 132, and the shape of the orthographic projection of the auxiliary cathode layer 132 on the substrate 110 may be circular, elliptical, rectangular or other shapes, for example, to better improve the uneven display caused by IR-Drop of the display panel.
Further, the distance d between the edge of the auxiliary cathode layer 132 and the pixel defining layer is greater than 1um, so that a sufficient space is reserved for effective electrical connection between the cathode layer 160 and the side surface of the auxiliary cathode layer 132, and the distance d is not too large, but is usually less than 20um, so as to avoid the loss of the aperture ratio of the display panel.
In some embodiments, referring to the cross-sectional structure of another display panel provided in fig. 2, in the display panel, the electrode layer 130 further includes an auxiliary cathode base layer 133 disposed on a side of the auxiliary cathode layer 132 near the substrate 110, the auxiliary cathode base layer 133 completely covers the bottom of the first opening G1, so that, on one hand, the first organic layer 150 cannot completely cover the step formed by the auxiliary cathode layer 132 and the auxiliary cathode base layer 133, and at the position of the step formed by the auxiliary cathode layer 132 and the auxiliary cathode base layer 133, the side surface of the auxiliary cathode layer 132 is broken, and the second organic sub-portion 152 is disposed on the auxiliary cathode base layer 133 and is adjacent to the side surface of the auxiliary cathode layer 132, and likewise, a spacing area between the cathode layer 160 and the first organic sub-portion 151 and the second organic sub-portion 152 is electrically connected to the side surface of the auxiliary cathode layer 132, so as to further improve the problem of uneven display caused by IR-Drop of the display panel;
on the other hand, since the thickness of the first organic layer 150 is generally thinner, the actually formed first organic layer 150 generally includes holes (not shown in the drawings), and the cathode layer 160 may be electrically connected to the auxiliary cathode substrate layer 133 through the holes in the first organic layer 150, and the auxiliary cathode substrate layer 133 and the auxiliary cathode layer 132 may be regarded as an integral body electrically connected to the cathode layer 160, and the total electrically connected area of the cathode layer 160 and the auxiliary cathode substrate layer 133 and the auxiliary cathode layer 132 is larger than the electrically connected area of the auxiliary cathode layer 132 in the foregoing embodiment, so as to further improve the uneven display caused by IR-Drop of the display panel.
Further, in some embodiments, the electrode layer 130 includes a first electrode sub-layer 130a, a second electrode sub-layer 130b disposed on the first electrode sub-layer 130a, and a third electrode sub-layer 130c disposed on the second electrode sub-layer 130 b;
the anode layer 131 includes a first anode sublayer 1311, a second anode sublayer 1312 disposed on the first anode sublayer 1311, and a third anode sublayer 1313 disposed on the second anode sublayer 1312;
the auxiliary cathode layer 132 includes a first auxiliary cathode sub-layer 1321 disposed on the auxiliary cathode base layer 133, and a second auxiliary cathode sub-layer 1322 disposed on the first auxiliary cathode sub-layer 1321;
the first electrode sub-layer 130a includes the auxiliary cathode base layer 133 and the first anode sub-layer 1311, the second electrode sub-layer 130b includes the first auxiliary cathode sub-layer 1321 and the second anode sub-layer 1312, and the third electrode sub-layer 130c includes the second auxiliary cathode sub-layer 1322 and the second auxiliary cathode sub-layer 1322, that is, when forming each anode layer sub-layer correspondingly, the auxiliary cathode base layer 133 and the auxiliary cathode layer 132 are formed synchronously, so that the manufacturing procedure and the manufacturing cost of the display panel are saved, and the specific forming manner is detailed in the embodiment of the manufacturing method described later;
specifically, the materials of the first electrode sub-layer 130a and the third electrode sub-layer 130c are generally the same, and are metal oxides, for example, indium tin oxide, indium zinc oxide, indium gallium zinc oxide, or the like, the materials of the second electrode sub-layer 130b are metals, for example, silver, aluminum, or the like, the thickness of the first electrode sub-layer 130a is 20-200 nm, the thickness of the second electrode sub-layer 130b is 50-1000 nm, and the thickness of the third electrode sub-layer 130c is 5-100 nm.
In some embodiments, with continued reference to fig. 1 or fig. 2, the display panel further includes a second organic layer 140 disposed in the sub-pixel area A2, the second organic layer 140 is disposed between the anode layer 131 and the second organic sub-portion 152, in the sub-pixel area A2, the second organic layer 140 and the second organic sub-portion 152 form a completed organic light emitting function layer, light is emitted under the driving of the anode layer 131 and the cathode layer 160 to realize display, and in the auxiliary cathode area A1, only the first organic layer 150 is disposed, only a part of the film layer of the organic light emitting function layer has a thinner thickness, so that the first organic layer 150 disposed in the auxiliary cathode area A1 is beneficial to forming the first organic sub-portion 151 and the second organic sub-portion 152 in a fault manner, thereby realizing the electrical connection of the cathode layer 160 and the auxiliary cathode layer 132.
Typically, the second organic layer 140 includes a hole injection layer disposed on the anode layer 131, a hole transport layer disposed on the hole injection layer, and a light emitting layer disposed on the hole transport layer;
the first organic layer 150 includes an electron transport layer disposed on the light emitting layer, and an electron injection layer disposed on the electron transport layer, wherein the electron transport layer is generally set to a thickness of 10-30 nanometers, and the electron injection layer is generally set to a thickness of 0.5-10 nanometers.
In some embodiments, the cathode layer 160 is typically a silver film, a magnesium-silver alloy film, a ytterbium-silver alloy film, an indium-zinc oxide film, or a composite film formed by stacking at least two of the foregoing films, and the thickness of the cathode layer 160 is 10-20 nanometers.
In some embodiments, the greater the Taper angle (Taper) of the auxiliary cathode layer 132, that is, the greater the angle formed by the side surface of the auxiliary cathode layer 132 and the bottom surface of the auxiliary cathode layer 132, the more advantageous the first organic layer 150 may be in faults at the side surface position of the auxiliary cathode layer 132, and in practical applications, the angle formed by the side surface of the auxiliary cathode layer 132 and the bottom surface of the auxiliary cathode layer 132 may be greater than 60 degrees.
Another embodiment of the present application further provides a method for manufacturing the display panel in the foregoing embodiment, as described in detail below with reference to fig. 3a-3 d:
the preparation method of the display panel comprises the following steps:
referring to fig. 3a, a substrate 110 is provided, an electrode layer 130 is formed on the substrate 110, the electrode layer 130 includes an auxiliary electrode layer 132 and an anode layer 131 which are disposed at intervals, a pixel defining layer 120 is formed on the substrate 110, the pixel defining layer 120 forms a first opening G1 in a region corresponding to the auxiliary electrode layer 132 to define an auxiliary cathode region A1, the auxiliary cathode layer 132 only partially covers the bottom of the first opening G1, and forms a second opening G2 in a region corresponding to the anode layer 131 to define a sub-pixel region A2, wherein the electrode layer is formed by a conductive film generally firstly through a magnetron sputtering process, and the conductive film is patterned into a predetermined pattern through an exposure and etching process to form the electrode layer 130;
referring to fig. 3b, a second organic layer 140 is formed on the anode layer 131 of the sub-pixel region A2, wherein the second organic layer 140 is typically formed by an inkjet printing process, and includes a hole injection layer, a hole transport layer, and a light emitting layer stacked on the anode layer 131;
referring to fig. 3c, a first organic layer 150 is formed on the second organic layer 140, the pixel defining layer 120, the substrate 110 and the auxiliary electrode layer 132, wherein the thickness of the first organic layer 150 is smaller than that of the auxiliary electrode layer 132, the first organic layer 150 includes a first organic sub-portion 151 disposed on the auxiliary cathode layer 132, and a second organic sub-portion 152 disposed at a distance from the first organic sub-portion 151 and adjacent to a side surface of the auxiliary cathode layer 132, and the first organic layer 150 is typically formed by an evaporation process and includes an electron transport layer and an electron injection layer sequentially formed on the second organic layer 140;
referring to fig. 3d, a cathode layer 160 is formed on the first organic layer 150, the cathode layer 160 is formed on the first organic sub-portion 151 and the second organic sub-portion 152 and is electrically connected to the side surface of the auxiliary cathode layer 132 through a space region between the first organic sub-portion 151 and the second organic sub-portion 152, wherein the cathode layer 160 is generally formed through an evaporation process or a magnetron sputtering process.
Further, in the case that an auxiliary cathode substrate layer is further disposed under the auxiliary cathode layer, the forming process of the electrode layer is slightly different, specifically including the following steps:
sequentially forming a first conductive film, a second conductive film and a third conductive film from bottom to top through a magnetron sputtering process;
performing a first etching process on the third conductive film under the shielding of the first photomask, and performing a second etching process on the second conductive film to form the auxiliary cathode layer;
performing a third etching process on the first conductive film under the shielding of a second photomask to form the auxiliary cathode substrate layer and the anode layer;
specifically, the material of the first conductive film and the third conductive film is a metal oxide, for example, may be indium tin oxide, indium zinc oxide or indium gallium zinc oxide, and the material of the second conductive film is a metal, for example, may be silver or aluminum, and the first etching process, the second etching process and the third etching process are all wet etching processes, the etchants used in the first etching process and the third etching process include oxalic acid, and the etchants in the second etching process include phosphoric acid, acetic acid and nitric acid.
Another embodiment of the present application further provides a display device, including the display panel provided in the foregoing embodiment, where the display device includes, but is not limited to, a smart phone, a smart watch, a tablet computer, a notebook computer, a television, and the like.
The foregoing has described in detail a display panel and a display device according to embodiments of the present application, and specific examples have been applied to illustrate the principles and embodiments of the present application, and the above description of the embodiments is only for aiding in understanding the method and core idea of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.
Claims (9)
1. A display panel comprising a sub-pixel region and an auxiliary cathode region disposed at a distance from the sub-pixel region, the display panel comprising:
a substrate;
an electrode layer disposed on the substrate, including an auxiliary cathode layer located within the auxiliary cathode region;
a first organic layer disposed on the substrate and the electrode layer;
a cathode layer disposed on the first organic layer;
the thickness of the first organic layer is smaller than that of the auxiliary cathode layer, the first organic layer comprises a first organic sub-part arranged on the auxiliary cathode layer and a second organic sub-part which is arranged at intervals with the first organic sub-part and is adjacent to the side face of the auxiliary cathode layer, and the cathode layer is arranged on the first organic sub-part and the second organic sub-part and is electrically connected with the side face of the auxiliary cathode layer;
the display panel comprises a pixel definition layer arranged on the substrate, the pixel definition layer comprises a first opening positioned in the auxiliary cathode region, the auxiliary cathode layer is arranged in the first opening and partially covers the bottom of the first opening, the electrode layer also comprises an auxiliary cathode base layer arranged on one side of the auxiliary cathode layer close to the substrate, and the auxiliary cathode base layer completely covers the bottom of the first opening; the thickness of the first organic layer is as thin as the first organic layer contains holes, and the cathode layer is electrically connected with the auxiliary cathode substrate layer through the holes in the first organic layer.
2. The display panel of claim 1, wherein the electrode layer further comprises an anode layer disposed within the subpixel region, the anode layer and the auxiliary cathode layer being of the same material.
3. The display panel of claim 2, wherein the pixel defining layer includes a second opening in the subpixel region, the anode layer being disposed in the second opening.
4. The display panel of claim 2, wherein the electrode layer comprises a first electrode sub-layer, a second electrode sub-layer disposed on the first electrode sub-layer, and a third electrode sub-layer disposed on the second electrode sub-layer;
the auxiliary cathode layer comprises a first auxiliary cathode sub-layer arranged on the auxiliary cathode basal layer and a second auxiliary cathode sub-layer arranged on the first auxiliary cathode sub-layer;
the first electrode sub-layer includes the auxiliary cathode base layer, the second electrode sub-layer includes the first auxiliary cathode sub-layer, and the third electrode sub-layer includes the second auxiliary cathode sub-layer.
5. The display panel of claim 2, further comprising a second organic layer disposed in the sub-pixel region, the second organic layer disposed between the anode layer and the second organic sub-portion.
6. The display panel according to claim 1, wherein in the first opening, a region of the substrate not covered by the auxiliary cathode layer is ring-shaped.
7. The display panel of claim 6, wherein an edge of the auxiliary cathode layer is more than 1um away from the pixel defining layer.
8. The display panel of claim 1, wherein the side surface of the auxiliary cathode layer forms an angle greater than 60 degrees with the bottom surface of the auxiliary cathode layer.
9. A display device, characterized in that the display device comprises a display panel according to any one of claims 1-8.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560117A (en) * | 2018-12-21 | 2019-04-02 | 合肥鑫晟光电科技有限公司 | A kind of array substrate and preparation method thereof, display device |
| CN111261799A (en) * | 2020-01-02 | 2020-06-09 | 京东方科技集团股份有限公司 | Display substrate, manufacturing method thereof and display panel |
| CN112103326A (en) * | 2020-09-23 | 2020-12-18 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
| CN113725266A (en) * | 2020-05-26 | 2021-11-30 | 乐金显示有限公司 | Display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080001537A1 (en) * | 2006-06-28 | 2008-01-03 | Tpo Displays Corp. | System for displaying images |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560117A (en) * | 2018-12-21 | 2019-04-02 | 合肥鑫晟光电科技有限公司 | A kind of array substrate and preparation method thereof, display device |
| CN111261799A (en) * | 2020-01-02 | 2020-06-09 | 京东方科技集团股份有限公司 | Display substrate, manufacturing method thereof and display panel |
| CN113725266A (en) * | 2020-05-26 | 2021-11-30 | 乐金显示有限公司 | Display device |
| CN112103326A (en) * | 2020-09-23 | 2020-12-18 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
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