CN113611812A - Display panel, manufacturing method thereof and display device - Google Patents
Display panel, manufacturing method thereof and display device Download PDFInfo
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- CN113611812A CN113611812A CN202110902456.7A CN202110902456A CN113611812A CN 113611812 A CN113611812 A CN 113611812A CN 202110902456 A CN202110902456 A CN 202110902456A CN 113611812 A CN113611812 A CN 113611812A
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- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 239000004332 silver Substances 0.000 claims description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- 239000007772 electrode material Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 6
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- 229910052749 magnesium Inorganic materials 0.000 claims description 6
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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
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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
- H10K50/85—Arrangements for extracting light from the devices
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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
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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
- H10K59/1201—Manufacture or treatment
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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Abstract
The embodiment of the application provides a display panel, a manufacturing method thereof and a display device. The display panel comprises an auxiliary cathode positioned on a cathode layer and a patterned covering layer which is positioned on one side of the cathode layer far away from a substrate and comprises a plurality of covering units, wherein the orthographic projection of each light-emitting unit on the substrate is positioned in the orthographic projection of one covering unit on the substrate, and the thicknesses of the covering units corresponding to the organic light-emitting units with different colors are different. The auxiliary cathode in the embodiment can reduce the resistance of the cathode layer, so that the IR drop problem of the cathode is improved; the patterned covering layer is manufactured above the cathode layer and the auxiliary cathode, and the covering units corresponding to the organic light-emitting units with different colors are different in thickness, so that the light-emitting layers with different colors can have a good light-emitting effect, and the light-emitting rate of the display panel is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel, a manufacturing method thereof and a display device.
Background
In recent years, as a novel display device, an OLED (Organic Light-Emitting Diode) has attracted attention because of its advantages of self-luminescence, thinness, wide viewing angle, fast response time, high Light-Emitting efficiency, low driving voltage, low power consumption, simple manufacturing process, applicability to the field of flexible display, and the like.
In a conventional AMOLED (Active Matrix OLED) with a top emission structure, a cathode structure is crucial, and the thickness of the cathode directly determines the light transmittance. In the case of a small-sized AMOLED, the metal cathode is made thin to ensure sufficient light transmittance, and although the resistance of the cathode has an effect on the uniformity of the OLED panel, the effect of the resistance of the cathode is within an acceptable range due to the small size. However, for a large-sized AMOLED, the uniformity of the OLED panel is poor and the viewing effect is not good due to the serious resistance drop (IR drop) of the metal cathode, thereby affecting the application of the process method in large-sized AMOLED.
In the prior art, the problem of IR drop of the cathode can be improved by fabricating a transparent metal oxide cathode, but the transparent metal oxide, for example, Indium Zinc Oxide (IZO), generally needs to be prepared by a sputtering process, and the energy during sputtering is large, which is likely to damage an organic material layer in the OLED device, and further affects the injection efficiency, lifetime, and other properties of the OLED device, so the method of using the transparent metal oxide as the cathode is also limited.
In the prior art, the problem of cathode IR drop can be improved by an auxiliary cathode design, but at the same time, the cover material is left in the light emitting region, which affects the light emitting rate to a certain extent and the light emitting efficiency of the device.
Disclosure of Invention
The present application provides a display panel, a manufacturing method thereof, and a display device, which can improve the light extraction efficiency of the display panel while improving the cathode IR drop problem of the AMOLED display panel.
In a first aspect, an embodiment of the present application provides a display panel, including:
a substrate including a plurality of light emitting regions and a dark region surrounding the light emitting regions;
an anode layer positioned at one side of the substrate and including a plurality of anode units positioned in the light emitting region;
the pixel definition layer is positioned on one side of the anode layer, which is far away from the substrate, and is provided with a plurality of pixel openings penetrating through the pixel definition layer, and the orthographic projection of the pixel openings on the substrate is positioned in the orthographic projection of the anode units on the substrate;
an organic light emitting layer including a plurality of organic light emitting units, each of the organic light emitting units being located within one of the pixel openings;
a cathode layer covering the plurality of pixel openings and the plurality of organic light emitting cells;
an auxiliary cathode, which is positioned on one side of the cathode layer away from the substrate, and the orthographic projection of the auxiliary cathode on the substrate is positioned in the dark area;
the patterned covering layer is positioned on one side, away from the substrate, of the cathode layer and comprises a plurality of covering units, the orthographic projection of each light-emitting unit on the substrate is positioned in the orthographic projection of one covering unit on the substrate, and the thicknesses of the covering units corresponding to the organic light-emitting units with different colors are different.
Optionally, the organic light emitting unit includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit; the covering unit comprises a first covering unit positioned on the red light-emitting unit, a second covering unit positioned on the green light-emitting unit and a third covering unit positioned on the blue light-emitting unit; the thickness of the first covering unit is larger than that of the second covering unit, and the thickness of the second covering unit is larger than that of the third covering unit.
Optionally, a thickness of the first cover unit
Thickness of the second covering unit
Thickness of the third covering unit
Optionally, the patterned cover layer comprises a common cover layer, a first cover layer and a second cover layer on the common cover layer; the common covering layer covers the cathode layer and the auxiliary cathode, and a part of the common covering layer, which is positioned at the blue light-emitting unit, is a third covering unit; the first cover layer comprises a plurality of first sub-units, orthographic projections of the first sub-units on the substrate cover orthographic projections of the red light-emitting units on the substrate, and the first cover unit comprises a part of the common cover layer and the first sub-units which are positioned on the red light-emitting units; the second cover layer comprises a plurality of second sub-units, orthographic projections of the second sub-units on the substrate cover orthographic projections of the green light-emitting units on the substrate, and the second cover unit comprises parts of the common cover layer and the second sub-units which are positioned on the green light-emitting units.
Optionally, the material of the cathode layer comprises one or an alloy of magnesium, silver and aluminum, and the thickness of the cathode layer is 5nm to 20 nm.
Optionally, the material of the auxiliary cathode comprises one or an alloy of magnesium, silver and aluminum, and the thickness of the auxiliary cathode is 1 nm-500 nm.
In a second aspect, an embodiment of the present application provides a display device, which includes the display panel described above.
In a third aspect, an embodiment of the present application provides a method for manufacturing a display panel, including:
providing a substrate, wherein the substrate comprises a plurality of light emitting areas and a dark area surrounding the light emitting areas;
forming an anode layer on one side of the substrate, and carrying out graphical processing on the anode layer to obtain a plurality of anode units positioned in the light emitting area;
forming a pixel defining layer on the anode layer, and performing a patterning process on the pixel defining layer to form a plurality of pixel openings penetrating through the pixel defining layer, wherein the orthographic projection of the pixel openings on the substrate is located in the orthographic projection of the anode units on the substrate;
forming an organic light emitting layer including a plurality of organic light emitting units, each organic light emitting unit being located within one of the pixel openings;
forming a cathode layer covering the plurality of pixel openings and the plurality of organic light emitting cells;
forming an auxiliary cathode on the cathode layer, wherein the orthographic projection of the auxiliary cathode on the substrate is positioned in a dark space;
and forming a patterned covering layer, wherein the patterned covering layer is positioned on one side of the cathode layer, which is far away from the substrate, and comprises a plurality of covering units, the orthographic projection of each light-emitting unit on the substrate is positioned in the orthographic projection of one covering unit on the substrate, and the thicknesses of the covering units corresponding to the organic light-emitting units with different colors are different.
Optionally, the cathode is assisted on the cathode layer, comprising:
forming a first photosensitive material layer on one side, far away from the substrate, of the cathode layer, and performing patterning processing on the first photosensitive material layer to form a first opening penetrating through the first photosensitive material layer, wherein the orthographic projection of the first opening on the substrate is located in the dark area;
depositing an auxiliary electrode material layer, wherein the auxiliary electrode material layer covers the rest of the first photosensitive material layer and the cathode layer at the first opening;
stripping the remaining first photosensitive material layer to obtain the auxiliary cathode.
Optionally, the organic light emitting unit includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit; the covering unit comprises a first covering unit positioned on the red light-emitting unit, a second covering unit positioned on the green light-emitting unit and a third covering unit positioned on the blue light-emitting unit;
forming a patterned cap layer comprising:
depositing a common covering layer, wherein the common covering layer covers the cathode layer and the auxiliary cathode, and the part of the common covering layer, which is positioned on the blue light-emitting unit, is a third covering unit;
forming a second photosensitive material layer on one side of the common covering layer, which is far away from the substrate, and performing patterning processing on the second photosensitive material layer to form a second opening penetrating through the second photosensitive material layer, wherein the orthographic projection of the second opening on the substrate is positioned in the orthographic projection of the red light-emitting unit on the substrate;
depositing a first cover layer material, wherein the first cover layer material covers the remaining second photosensitive material layer and the common cover layer at the second opening, and then stripping the remaining second photosensitive material layer to obtain the first cover layer, wherein the first cover layer comprises a plurality of first subunits, and the first cover unit comprises the common cover layer and the first subunits which are positioned on the red light-emitting unit;
forming a third photosensitive material layer on one side, far away from the substrate, of the first covering layer, and performing patterning processing on the third photosensitive material layer to form a third opening penetrating through the third photosensitive material layer, wherein an orthographic projection of the third opening on the substrate is located in an orthographic projection of the green light-emitting unit on the substrate;
depositing a second cover layer material, wherein the second cover layer material covers the remaining third photosensitive material layer and the common cover layer at the third opening, and stripping the remaining third photosensitive material layer to obtain the second cover layer, wherein the second cover layer comprises a plurality of second subunits, and the second cover unit comprises a part of the common cover layer and the second subunits which are positioned on the green light-emitting units.
The technical scheme provided by the embodiment of the application has the following beneficial technical effects:
according to the display panel, the manufacturing method thereof and the display device, the resistance of the cathode layer is reduced by arranging the auxiliary cathode, so that the IR drop problem of the cathode is improved; the patterned covering layer is manufactured above the cathode layer and the auxiliary cathode, the patterned covering layer comprises a plurality of covering units, the covering units corresponding to the organic light emitting units with different colors are different in thickness, so that the light emitting layers with different colors can have a good light emitting effect, and the light emitting rate of the display panel is improved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another display panel provided in the embodiment of the present application;
fig. 3 is a schematic diagram of a frame structure of a display device according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart illustrating a manufacturing method of a display panel according to an embodiment of the present disclosure;
FIG. 5 is a schematic process diagram of step S1 in the method for manufacturing the display panel shown in FIG. 4;
FIG. 6 is a schematic process diagram of step S2 in the method for manufacturing the display panel shown in FIG. 4;
FIG. 7 is a schematic process diagram of step S3 in the method for manufacturing the display panel shown in FIG. 4;
FIG. 8 is a schematic process diagram of step S4 in the method for manufacturing the display panel shown in FIG. 4;
fig. 9 is a schematic process diagram of step S5 in the method for manufacturing the display panel shown in fig. 4;
FIG. 10 is a flowchart illustrating step S5 of the method for manufacturing the display panel shown in FIG. 4;
fig. 11 is a schematic process diagram of step S501 in the method for manufacturing the display panel shown in fig. 10;
fig. 12 is a schematic process diagram of step S502 in the method for manufacturing the display panel shown in fig. 10;
fig. 13 is a schematic process diagram of step S6 in the method for manufacturing the display panel shown in fig. 4;
fig. 14 is a schematic process diagram of step S601 in the method for manufacturing the display panel shown in fig. 13;
fig. 15 is a schematic process diagram of step S602 in the method for manufacturing the display panel shown in fig. 13;
fig. 16 is a schematic process diagram of step S603 in the method for manufacturing the display panel shown in fig. 13;
fig. 17 is a schematic structural diagram of the display panel after the step S603 in the manufacturing method of the display panel shown in fig. 13;
fig. 18 is a schematic process diagram of step S604 in the method for manufacturing the display panel shown in fig. 13;
fig. 19 is a flowchart illustrating step S605 of the method for manufacturing the display panel shown in fig. 13.
Reference numerals:
1-a substrate;
2-an anode layer; 21-an anode unit;
3-a pixel definition layer; 31-pixel openings;
4-an organic light-emitting layer; r-red light emitting unit; a G-green light emitting unit; b-a blue light-emitting unit;
5-a cathode layer;
6-an auxiliary cathode;
7-patterning the cover layer; 71-a common cover layer; 72-a first cover layer; 73-a second cover layer;
10-a light emitting zone; 20-dark area;
100-a first covering unit; 200-a second covering unit; 300-a third covering unit;
m1 — a first photosensitive material layer; m2 — a second photosensitive material layer; m 3-third photosensitive material layer.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
In the conventional AMOLED display panel with the top emission structure, the cathode structure is very important, and the thickness of the cathode directly determines the light transmittance. In the case of a small-sized AMOLED, the metal cathode is made thin to ensure sufficient light transmittance, and although the resistance of the cathode has an effect on the uniformity of the OLED panel, the effect of the resistance of the cathode is within an acceptable range due to the small size. However, for a large-sized AMOLED, the uniformity of the OLED panel is poor and the viewing effect is not good due to the serious resistance drop (IR drop) of the metal cathode, thereby affecting the application of the process method in large-sized AMOLED.
In the prior art, the problem of IR drop of the cathode can be improved by fabricating a transparent metal oxide cathode, but the transparent metal oxide, for example IZO, usually needs to be prepared by a sputtering process, and the energy during sputtering is large, which is likely to damage the organic material layer in the OLED device, and further affects the injection efficiency, lifetime, and other properties of the OLED device, so the method of using the transparent metal oxide as the cathode is also limited.
In the prior art, the problem of cathode IR drop can be solved by designing an auxiliary cathode, mainly by adopting an OTI method, and the method adopts a CPM organic material and a modified magnesium metal material to realize the manufacture of the auxiliary cathode. Specifically, the CPM material is evaporated to the luminous region through FMM, the modified magnesium material is evaporated through Open Mask, and the modified magnesium material is attached to the dark region only by utilizing the mutual repulsion characteristic of the modified magnesium material and the CPM organic material, namely the patterning of the modified magnesium material is realized, so that the auxiliary cathode is obtained. However, the CPM material remains in the light-emitting region, which affects the light extraction efficiency to some extent and the light-emitting efficiency of the device.
The application provides a display panel, a manufacturing method thereof and a display device, which aim to solve the above technical problems in the prior art.
An embodiment of the present application provides a display panel, as shown in fig. 1, including:
a substrate 1 including a plurality of light emitting regions 10 and a dark region 20 surrounding the light emitting regions 10;
an anode layer 2 positioned at one side of the substrate 1 and including a plurality of anode cells 21 positioned at the light emitting regions 10;
a pixel defining layer 3, which is located on one side of the anode layer 2 away from the substrate 1 and is provided with a plurality of pixel openings 31 penetrating through the pixel defining layer 3, wherein the orthographic projection of the pixel openings 31 on the substrate 1 is located in the orthographic projection of the anode units 21 on the substrate 1;
an organic light emitting layer 4 including a plurality of organic light emitting units, each of which is located within one of the pixel openings 31;
a cathode layer 5 covering the plurality of pixel openings 31 and the plurality of organic light emitting cells;
an auxiliary cathode 6, which is positioned on one side of the cathode layer 5 far away from the substrate 1, and the orthographic projection on the substrate 1 is positioned in a dark area 20;
and the patterned covering layer 7 is positioned on one side of the cathode layer 5, which is far away from the substrate 1, and comprises a plurality of covering units, the orthographic projection of each light-emitting unit on the substrate 1 is positioned in the orthographic projection of one covering unit on the substrate 1, and the thicknesses of the covering units corresponding to the organic light-emitting units with different colors are different.
Specifically, the patterned cover layer 7 is made of a material having a large refractive index and a small absorption coefficient, thereby having an effect of improving light transmittance. As the patterned cover layer 7, aromatic amine compounds such as triphenylamines, butadienes, and styryltrisinilines, for example, NPB ((N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine) can be used.
Specifically, in the display panel provided in this embodiment, the material of the cathode layer 5 includes one of magnesium, silver, and aluminum, or an alloy thereof, and the thickness of the cathode layer 5 is 5nm to 20 nm. For example, in one embodiment, the material of the cathode layer 5 is a silver alloy, and when the thickness of the cathode layer 5 is designed, it is required to ensure that the transmittance Tr of the cathode layer 5 satisfies Tr (550nm) > 55%, and the sheet resistance Rs of the cathode layer 5 satisfies: 5 Ω/sq < Rs <15 Ω/sq.
Specifically, in the display panel provided in this embodiment, the material of the auxiliary cathode 6 includes one of magnesium, silver, and aluminum, or an alloy thereof, and the thickness of the auxiliary cathode 6 is 1nm to 500 nm.
In the display panel provided in this embodiment, the auxiliary cathode 6 is provided to reduce the resistance of the cathode layer 5, thereby improving the IR drop problem of the cathode; the patterned covering layer 7 is manufactured above the cathode layer 5 and the auxiliary cathode 6, the patterned covering layer 7 comprises a plurality of covering units, the covering units corresponding to the organic light-emitting units with different colors have different thicknesses, so that the light-emitting layers with different colors can have good light-emitting effects, and the light-emitting rate of the display panel is improved.
As shown in fig. 1, the present embodiment provides a display panel in which organic light emitting units include a red light emitting unit R, a green light emitting unit G, and a blue light emitting unit B; the covering unit includes a first covering unit 100 on the red light emitting unit R, a second covering unit 200 on the green light emitting unit G, and a third covering unit 300 on the blue light emitting unit B; the thickness of the first cover unit 100 is greater than that of the second cover unit 200, and the thickness of the second cover unit 200 is greater than that of the third cover unit 300.
As shown in fig. 1, in particular, the present embodiment provides a display panel in which the thickness of the first cover unit 100
Thickness of the second cover unit 200
Thickness of the third cover unit 300
By verification, the white light efficiency of the display panel is improved by 8% by adopting the covering units with different thicknesses, and the light emitting performance of the display panel is obviously improved.
As shown in fig. 2, in particular, the present embodiment provides a display panel in which the patterned cover layer 7 includes a common patterned cover layer 7, a first patterned cover layer 7 and a second patterned cover layer 7 on the common patterned cover layer 7; the common patterned covering layer 7 covers the cathode layer 5 and the auxiliary cathode 6, and a portion of the common patterned covering layer 7 located on the blue light-emitting unit B is a third covering unit 300, the first patterned covering layer 7 includes a plurality of first sub-units, an orthographic projection of the first sub-units on the substrate 1 covers an orthographic projection of the red light-emitting unit R on the substrate 1, and the first covering unit 100 includes a portion located on the red light-emitting unit R and the first sub-units; the second patterned cover layer 7 includes a plurality of second sub-units, an orthographic projection of the second sub-units on the substrate 1 covers an orthographic projection of the green light emitting units G on the substrate 1, and the second cover unit 200 includes a portion on the green light emitting units G and the second sub-units.
It should be noted that the display panel provided in this embodiment may further include one or more of an electron injection layer, an electron transport layer, a hole injection layer, and a hole transport layer according to specific requirements, so as to optimize the light emitting performance of the display panel. In addition, the display panel provided in this embodiment further includes a plurality of film layers located between the substrate 1 and the anode layer 2 for forming the pixel circuit, and this embodiment is not described one by one.
Based on the same inventive concept, an embodiment of the present application provides a display device, as shown in fig. 3, the display device includes the display panel in the above embodiment, and has the beneficial effects of the display panel in the above embodiment, which are not described herein again.
As shown in fig. 3, in particular, the display device provided in this embodiment further includes a driving chip and a power supply, where the driving chip is configured to provide a driving signal for the display panel, and the power supply is configured to provide power for the display panel.
Based on the same inventive concept, embodiments of the present application provide a method for manufacturing a display panel, as shown in fig. 4 to 9, the method for manufacturing a display panel includes:
s1: providing a substrate 1, forming an anode layer 2 on one side of the substrate 1 and carrying out patterning processing on the anode layer 2 to obtain a plurality of anode units 21, wherein the substrate 1 comprises a plurality of light emitting areas 10 and dark areas 20 surrounding the light emitting areas 10, and each anode unit 21 is positioned in one light emitting area 10. S2: a pixel defining layer 3 is formed on the anode layer 2, and the pixel defining layer 3 is patterned to form a plurality of pixel openings 31 penetrating through the pixel defining layer 3, and the orthographic projection of the pixel openings 31 on the substrate 1 is located within the orthographic projection of the anode unit 21 on the substrate 1.
S3: the organic light emitting layer 4 is formed, and the organic light emitting layer 4 includes a plurality of organic light emitting units each of which is located in one of the pixel openings 31.
S4: a cathode layer 5 is formed, and the cathode layer 5 covers the plurality of pixel openings 31 and the plurality of organic light emitting cells. Cathode layer 5 material the cathode layer 5 material comprises one of magnesium, silver and aluminum or its alloy, the thickness of the cathode layer 5 is 5 nm-20 nm.
S5: an auxiliary cathode 6 is formed on the cathode layer 5, and the orthographic projection of the auxiliary cathode 6 on the substrate 1 is located in the dark space 20. Specifically, the material of the auxiliary cathode 6 comprises one of magnesium, silver and aluminum or an alloy thereof, and the thickness of the auxiliary cathode 6 is 1 nm-500 nm.
S6: and forming a patterned covering layer 7, wherein the patterned covering layer is positioned on one side of the cathode layer 5, which is far away from the substrate 1, and comprises a plurality of covering units, the orthographic projection of each light-emitting unit on the substrate 1 is positioned in the orthographic projection of one covering unit on the substrate 1, and the thicknesses of the covering units corresponding to the organic light-emitting units with different colors are different.
Specifically, a display panel with a patterned cover layer is shown in fig. 1. The patterned covering layer 7 is made of a material with a large refractive index and a small light absorption coefficient, so that the effect of improving the light transmittance is achieved. As the patterned cover layer 7, aromatic amine compounds such as triphenylamines, butadienes, and styryltrisinilines, for example, NPB ((N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine) can be used.
In the method for manufacturing the display panel provided by this embodiment, the auxiliary cathode 6 is provided to reduce the resistance of the cathode layer 5, thereby improving the IR drop problem of the cathode; the patterned covering layer 7 is manufactured above the cathode layer 5 and the auxiliary cathode 6, the patterned covering layer 7 comprises a plurality of covering units, the covering units corresponding to the organic light-emitting units with different colors have different thicknesses, so that the light-emitting layers with different colors can have good light-emitting effects, and the light-emitting rate of the display panel is improved.
Optionally, as shown in fig. 10 to 12, in the manufacturing method of the display panel provided in this embodiment, step S5 includes:
s501: a first photosensitive material layer m1 is formed on the side of the cathode layer 5 away from the substrate 1, and the first photosensitive material layer m1 is subjected to patterning processing to form a first opening (not labeled in fig. 11) penetrating through the first photosensitive material layer m1, wherein the thickness of the first photosensitive material layer m1 is greater than that of the auxiliary electrode 6, and the orthographic projection of the first opening on the substrate 1 is located in the dark area 20.
S502: an auxiliary electrode material layer is deposited, and the auxiliary electrode material layer covers the remaining first photosensitive material layer m1 and the cathode layer 5 at the first opening.
S503: the remaining first photosensitive material layer m1 is peeled off to obtain the auxiliary cathode 6. Specifically, when the remaining first photosensitive material layer m1 is peeled off, the auxiliary electrode material layer located thereon is also peeled off.
In the present embodiment, by manufacturing the first photosensitive material layer m1 having a thickness greater than that of the auxiliary electrode 6 and performing patterning processing on the first photosensitive material layer m1, the auxiliary electrode 6 can be obtained by peeling off the remaining first photosensitive material layer m1, and the operation is simple.
Specifically, as shown in fig. 2, the organic light emitting unit includes a red light emitting unit R, a green light emitting unit G, and a blue light emitting unit B; the cover unit includes a first cover unit 100 on the red light emitting unit R, a second cover unit 200 on the green light emitting unit G, and a third cover unit 300 on the blue light emitting unit B. Based on this, as shown in fig. 13 to fig. 19, in the manufacturing method of the display panel provided in this embodiment, step S6 includes:
s601: a common capping layer 71 is deposited, the common capping layer 71 covers the cathode layer 5 and the auxiliary cathode 6, and a portion of the common capping layer 71 located at the blue light emitting cell B is a third capping unit 300.
S602: a second photosensitive material layer m2 is formed on the side of the common cover 71 away from the substrate 1, and the second photosensitive material layer m2 is subjected to patterning processing to form a second opening (not labeled in fig. 15) penetrating through the second photosensitive material layer m2, and the orthographic projection of the second opening on the substrate 1 is located on the orthographic projection of the red light-emitting unit R on the substrate 1. Referring to fig. 1, the thickness of the second photosensitive material layer m2 is greater than that of the first cover layer 72.
S603: depositing a first cover layer 72 material, the first cover layer 72 material covering the remaining second photosensitive material layer m2 and the common cover layer 71 at the second opening, and peeling off the remaining second photosensitive material layer m2 to obtain the first cover layer 72, wherein the first cover layer 72 includes a plurality of first sub-units, and the first cover unit 100 includes the common cover layer 71 and the first sub-units on the red light-emitting unit R.
S604: forming a third photosensitive material layer m3 on the side of the first cover layer 72 away from the substrate 1, and performing a patterning process on the third photosensitive material layer m3 to form a third opening (not labeled in fig. 18) penetrating through the third photosensitive material layer m3, wherein an orthographic projection of the third opening on the substrate 1 is located within an orthographic projection of the green light-emitting unit G on the substrate 1;
s605: depositing a second capping layer 73 material, the second capping layer 73 material covering the remaining third photosensitive material layer m3 and the common capping layer 71 at the third opening, and peeling off the remaining third photosensitive material layer m3 to obtain the second capping layer 73, the second capping layer 73 including a plurality of second sub-units, and the second capping unit 200 including a portion of the common capping layer 71 and the second sub-units on the green light-emitting unit G.
In this embodiment, the common cover layer 71 is combined with the first cover layer 72 and the second cover layer 73, and the patterned cover layer 7 can be obtained by performing the patterning process twice, which is simple to operate.
By applying the embodiment of the application, at least the following beneficial effects can be realized:
according to the display panel, the manufacturing method thereof and the display device, the resistance of the cathode layer is reduced by arranging the auxiliary cathode, so that the IR drop problem of the cathode is improved; the patterned covering layer is manufactured above the cathode layer and the auxiliary cathode, the patterned covering layer comprises a plurality of covering units, the covering units corresponding to the organic light emitting units with different colors are different in thickness, so that the light emitting layers with different colors can have a good light emitting effect, and the light emitting rate of the display panel is improved.
Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (10)
1. A display panel, comprising:
a substrate including a plurality of light emitting regions and a dark region surrounding the light emitting regions;
an anode layer positioned at one side of the substrate and including a plurality of anode units positioned in the light emitting region;
the pixel definition layer is positioned on one side of the anode layer, which is far away from the substrate, and is provided with a plurality of pixel openings penetrating through the pixel definition layer, and the orthographic projection of the pixel openings on the substrate is positioned in the orthographic projection of the anode units on the substrate;
an organic light emitting layer including a plurality of organic light emitting units, each of the organic light emitting units being located within one of the pixel openings;
a cathode layer covering the plurality of pixel openings and the plurality of organic light emitting cells;
an auxiliary cathode, which is positioned on one side of the cathode layer away from the substrate, and the orthographic projection of the auxiliary cathode on the substrate is positioned in the dark area;
the patterned covering layer is positioned on one side, away from the substrate, of the cathode layer and comprises a plurality of covering units, the orthographic projection of each light-emitting unit on the substrate is positioned in the orthographic projection of one covering unit on the substrate, and the thicknesses of the covering units corresponding to the organic light-emitting units with different colors are different.
2. The display panel according to claim 1,
the organic light emitting unit includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit;
the covering unit comprises a first covering unit positioned on the red light-emitting unit, a second covering unit positioned on the green light-emitting unit and a third covering unit positioned on the blue light-emitting unit;
the thickness of the first covering unit is larger than that of the second covering unit, and the thickness of the second covering unit is larger than that of the third covering unit.
3. The display panel according to claim 2,
thickness of the first covering unit
Thickness of the second covering unit
Thickness of the third covering unit
4. The display panel of claim 2, wherein the patterned cover layer comprises a common cover layer, a first cover layer and a second cover layer on the common cover layer;
the common cover layer covers the cathode layer and the auxiliary cathode, and a portion of the common cover layer, which is located at the blue light emitting unit, is a third cover unit,
the first cover layer comprises a plurality of first sub-units, orthographic projections of the first sub-units on the substrate cover orthographic projections of the red light-emitting units on the substrate, and the first cover unit comprises a part of the common cover layer and the first sub-units which are positioned on the red light-emitting units;
the second cover layer comprises a plurality of second sub-units, orthographic projections of the second sub-units on the substrate cover orthographic projections of the green light-emitting units on the substrate, and the second cover unit comprises parts of the common cover layer and the second sub-units which are positioned on the green light-emitting units.
5. The display panel according to claim 1, wherein the material of the cathode layer comprises one of magnesium, silver and aluminum or an alloy thereof, and the thickness of the cathode layer is 5nm to 20 nm.
6. The display panel according to claim 1, wherein the material of the auxiliary cathode comprises one of magnesium, silver and aluminum or an alloy thereof, and the thickness of the auxiliary cathode is 1nm to 500 nm.
7. A display device characterized by comprising the display panel according to any one of claims 1 to 6.
8. A method for manufacturing a display panel is characterized by comprising the following steps:
providing a substrate, wherein the substrate comprises a plurality of light emitting areas and a dark area surrounding the light emitting areas;
forming an anode layer on one side of the substrate, and carrying out graphical processing on the anode layer to obtain a plurality of anode units positioned in the light emitting area;
forming a pixel defining layer on the anode layer, and performing a patterning process on the pixel defining layer to form a plurality of pixel openings penetrating through the pixel defining layer, wherein the orthographic projection of the pixel openings on the substrate is located in the orthographic projection of the anode units on the substrate;
forming an organic light emitting layer including a plurality of organic light emitting units, each organic light emitting unit being located within one of the pixel openings;
forming a cathode layer covering the plurality of pixel openings and the plurality of organic light emitting cells;
forming an auxiliary cathode on the cathode layer, wherein the orthographic projection of the auxiliary cathode on the substrate is positioned in a dark space;
and forming a patterned covering layer, wherein the patterned covering layer is positioned on one side of the cathode layer, which is far away from the substrate, and comprises a plurality of covering units, the orthographic projection of each light-emitting unit on the substrate is positioned in the orthographic projection of one covering unit on the substrate, and the thicknesses of the covering units corresponding to the organic light-emitting units with different colors are different.
9. The method of claim 8, wherein the step of assisting the cathode on the cathode layer comprises:
forming a first photosensitive material layer on one side, far away from the substrate, of the cathode layer, and performing patterning processing on the first photosensitive material layer to form a first opening penetrating through the first photosensitive material layer, wherein the orthographic projection of the first opening on the substrate is located in the dark area;
depositing an auxiliary electrode material layer, wherein the auxiliary electrode material layer covers the rest of the first photosensitive material layer and the cathode layer at the first opening;
stripping the remaining first photosensitive material layer to obtain the auxiliary cathode.
10. The method of manufacturing a display panel according to claim 8, wherein the organic light emitting unit includes a red light emitting unit, a green light emitting unit, and a blue light emitting unit; the covering unit comprises a first covering unit positioned on the red light-emitting unit, a second covering unit positioned on the green light-emitting unit and a third covering unit positioned on the blue light-emitting unit;
forming a patterned cap layer comprising:
depositing a common covering layer, wherein the common covering layer covers the cathode layer and the auxiliary cathode, and the part of the common covering layer, which is positioned on the blue light-emitting unit, is a third covering unit;
forming a second photosensitive material layer on one side of the common covering layer, which is far away from the substrate, and performing patterning processing on the second photosensitive material layer to form a second opening penetrating through the second photosensitive material layer, wherein the orthographic projection of the second opening on the substrate is positioned in the orthographic projection of the red light-emitting unit on the substrate;
depositing a first cover layer material, wherein the first cover layer material covers the remaining second photosensitive material layer and the common cover layer at the second opening, and then stripping the remaining second photosensitive material layer to obtain the first cover layer, wherein the first cover layer comprises a plurality of first subunits, and the first cover unit comprises the common cover layer and the first subunits which are positioned on the red light-emitting unit;
forming a third photosensitive material layer on one side, far away from the substrate, of the first covering layer, and performing patterning processing on the third photosensitive material layer to form a third opening penetrating through the third photosensitive material layer, wherein an orthographic projection of the third opening on the substrate is located in an orthographic projection of the green light-emitting unit on the substrate;
depositing a second cover layer material, wherein the second cover layer material covers the remaining third photosensitive material layer and the common cover layer at the third opening, and stripping the remaining third photosensitive material layer to obtain the second cover layer, wherein the second cover layer comprises a plurality of second subunits, and the second cover unit comprises a part of the common cover layer and the second subunits which are positioned on the green light-emitting units.
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